diff options
47 files changed, 2415 insertions, 270 deletions
diff --git a/Documentation/devicetree/bindings/dma/atmel-xdma.txt b/Documentation/devicetree/bindings/dma/atmel-xdma.txt new file mode 100644 index 000000000000..0eb2b3207e08 --- /dev/null +++ b/Documentation/devicetree/bindings/dma/atmel-xdma.txt @@ -0,0 +1,54 @@ +* Atmel Extensible Direct Memory Access Controller (XDMAC) + +* XDMA Controller +Required properties: +- compatible: Should be "atmel,<chip>-dma". + <chip> compatible description: + - sama5d4: first SoC adding the XDMAC +- reg: Should contain DMA registers location and length. +- interrupts: Should contain DMA interrupt. +- #dma-cells: Must be <1>, used to represent the number of integer cells in +the dmas property of client devices. + - The 1st cell specifies the channel configuration register: + - bit 13: SIF, source interface identifier, used to get the memory + interface identifier, + - bit 14: DIF, destination interface identifier, used to get the peripheral + interface identifier, + - bit 30-24: PERID, peripheral identifier. + +Example: + +dma1: dma-controller@f0004000 { + compatible = "atmel,sama5d4-dma"; + reg = <0xf0004000 0x200>; + interrupts = <50 4 0>; + #dma-cells = <1>; +}; + + +* DMA clients +DMA clients connected to the Atmel XDMA controller must use the format +described in the dma.txt file, using a one-cell specifier for each channel. +The two cells in order are: +1. A phandle pointing to the DMA controller. +2. Channel configuration register. Configurable fields are: + - bit 13: SIF, source interface identifier, used to get the memory + interface identifier, + - bit 14: DIF, destination interface identifier, used to get the peripheral + interface identifier, + - bit 30-24: PERID, peripheral identifier. + +Example: + +i2c2: i2c@f8024000 { + compatible = "atmel,at91sam9x5-i2c"; + reg = <0xf8024000 0x4000>; + interrupts = <34 4 6>; + dmas = <&dma1 + (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1) + | AT91_XDMAC_DT_PERID(6))>, + <&dma1 + (AT91_XDMAC_DT_MEM_IF(0) | AT91_XDMAC_DT_PER_IF(1) + | AT91_XDMAC_DT_PERID(7))>; + dma-names = "tx", "rx"; +}; diff --git a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt index 4659fd952301..dc8d3aac1aa9 100644 --- a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt +++ b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt @@ -48,6 +48,7 @@ The full ID of peripheral types can be found below. 21 ESAI 22 SSI Dual FIFO (needs firmware ver >= 2) 23 Shared ASRC + 24 SAI The third cell specifies the transfer priority as below. diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt index d75a9d767022..f8c3311b7153 100644 --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt @@ -1,7 +1,9 @@ QCOM BAM DMA controller Required properties: -- compatible: must contain "qcom,bam-v1.4.0" for MSM8974 +- compatible: must be one of the following: + * "qcom,bam-v1.4.0" for MSM8974, APQ8074 and APQ8084 + * "qcom,bam-v1.3.0" for APQ8064, IPQ8064 and MSM8960 - reg: Address range for DMA registers - interrupts: Should contain the one interrupt shared by all channels - #dma-cells: must be <1>, the cell in the dmas property of the client device diff --git a/Documentation/devicetree/bindings/dma/sun6i-dma.txt b/Documentation/devicetree/bindings/dma/sun6i-dma.txt index 3e145c1675b1..9cdcba24d7c3 100644 --- a/Documentation/devicetree/bindings/dma/sun6i-dma.txt +++ b/Documentation/devicetree/bindings/dma/sun6i-dma.txt @@ -4,7 +4,7 @@ This driver follows the generic DMA bindings defined in dma.txt. Required properties: -- compatible: Must be "allwinner,sun6i-a31-dma" +- compatible: Must be "allwinner,sun6i-a31-dma" or "allwinner,sun8i-a23-dma" - reg: Should contain the registers base address and length - interrupts: Should contain a reference to the interrupt used by this device - clocks: Should contain a reference to the parent AHB clock diff --git a/Documentation/dmaengine.txt b/Documentation/dmaengine/client.txt index 11fb87ff6cd0..11fb87ff6cd0 100644 --- a/Documentation/dmaengine.txt +++ b/Documentation/dmaengine/client.txt diff --git a/Documentation/dmatest.txt b/Documentation/dmaengine/dmatest.txt index dd77a81bdb80..dd77a81bdb80 100644 --- a/Documentation/dmatest.txt +++ b/Documentation/dmaengine/dmatest.txt diff --git a/Documentation/dmaengine/provider.txt b/Documentation/dmaengine/provider.txt new file mode 100644 index 000000000000..766658ccf235 --- /dev/null +++ b/Documentation/dmaengine/provider.txt @@ -0,0 +1,366 @@ +DMAengine controller documentation +================================== + +Hardware Introduction ++++++++++++++++++++++ + +Most of the Slave DMA controllers have the same general principles of +operations. + +They have a given number of channels to use for the DMA transfers, and +a given number of requests lines. + +Requests and channels are pretty much orthogonal. Channels can be used +to serve several to any requests. To simplify, channels are the +entities that will be doing the copy, and requests what endpoints are +involved. + +The request lines actually correspond to physical lines going from the +DMA-eligible devices to the controller itself. Whenever the device +will want to start a transfer, it will assert a DMA request (DRQ) by +asserting that request line. + +A very simple DMA controller would only take into account a single +parameter: the transfer size. At each clock cycle, it would transfer a +byte of data from one buffer to another, until the transfer size has +been reached. + +That wouldn't work well in the real world, since slave devices might +require a specific number of bits to be transferred in a single +cycle. For example, we may want to transfer as much data as the +physical bus allows to maximize performances when doing a simple +memory copy operation, but our audio device could have a narrower FIFO +that requires data to be written exactly 16 or 24 bits at a time. This +is why most if not all of the DMA controllers can adjust this, using a +parameter called the transfer width. + +Moreover, some DMA controllers, whenever the RAM is used as a source +or destination, can group the reads or writes in memory into a buffer, +so instead of having a lot of small memory accesses, which is not +really efficient, you'll get several bigger transfers. This is done +using a parameter called the burst size, that defines how many single +reads/writes it's allowed to do without the controller splitting the +transfer into smaller sub-transfers. + +Our theoretical DMA controller would then only be able to do transfers +that involve a single contiguous block of data. However, some of the +transfers we usually have are not, and want to copy data from +non-contiguous buffers to a contiguous buffer, which is called +scatter-gather. + +DMAEngine, at least for mem2dev transfers, require support for +scatter-gather. So we're left with two cases here: either we have a +quite simple DMA controller that doesn't support it, and we'll have to +implement it in software, or we have a more advanced DMA controller, +that implements in hardware scatter-gather. + +The latter are usually programmed using a collection of chunks to +transfer, and whenever the transfer is started, the controller will go +over that collection, doing whatever we programmed there. + +This collection is usually either a table or a linked list. You will +then push either the address of the table and its number of elements, +or the first item of the list to one channel of the DMA controller, +and whenever a DRQ will be asserted, it will go through the collection +to know where to fetch the data from. + +Either way, the format of this collection is completely dependent on +your hardware. Each DMA controller will require a different structure, +but all of them will require, for every chunk, at least the source and +destination addresses, whether it should increment these addresses or +not and the three parameters we saw earlier: the burst size, the +transfer width and the transfer size. + +The one last thing is that usually, slave devices won't issue DRQ by +default, and you have to enable this in your slave device driver first +whenever you're willing to use DMA. + +These were just the general memory-to-memory (also called mem2mem) or +memory-to-device (mem2dev) kind of transfers. Most devices often +support other kind of transfers or memory operations that dmaengine +support and will be detailed later in this document. + +DMA Support in Linux +++++++++++++++++++++ + +Historically, DMA controller drivers have been implemented using the +async TX API, to offload operations such as memory copy, XOR, +cryptography, etc., basically any memory to memory operation. + +Over time, the need for memory to device transfers arose, and +dmaengine was extended. Nowadays, the async TX API is written as a +layer on top of dmaengine, and acts as a client. Still, dmaengine +accommodates that API in some cases, and made some design choices to +ensure that it stayed compatible. + +For more information on the Async TX API, please look the relevant +documentation file in Documentation/crypto/async-tx-api.txt. + +DMAEngine Registration +++++++++++++++++++++++ + +struct dma_device Initialization +-------------------------------- + +Just like any other kernel framework, the whole DMAEngine registration +relies on the driver filling a structure and registering against the +framework. In our case, that structure is dma_device. + +The first thing you need to do in your driver is to allocate this +structure. Any of the usual memory allocators will do, but you'll also +need to initialize a few fields in there: + + * channels: should be initialized as a list using the + INIT_LIST_HEAD macro for example + + * dev: should hold the pointer to the struct device associated + to your current driver instance. + +Supported transaction types +--------------------------- + +The next thing you need is to set which transaction types your device +(and driver) supports. + +Our dma_device structure has a field called cap_mask that holds the +various types of transaction supported, and you need to modify this +mask using the dma_cap_set function, with various flags depending on +transaction types you support as an argument. + +All those capabilities are defined in the dma_transaction_type enum, +in include/linux/dmaengine.h + +Currently, the types available are: + * DMA_MEMCPY + - The device is able to do memory to memory copies + + * DMA_XOR + - The device is able to perform XOR operations on memory areas + - Used to accelerate XOR intensive tasks, such as RAID5 + + * DMA_XOR_VAL + - The device is able to perform parity check using the XOR + algorithm against a memory buffer. + + * DMA_PQ + - The device is able to perform RAID6 P+Q computations, P being a + simple XOR, and Q being a Reed-Solomon algorithm. + + * DMA_PQ_VAL + - The device is able to perform parity check using RAID6 P+Q + algorithm against a memory buffer. + + * DMA_INTERRUPT + - The device is able to trigger a dummy transfer that will + generate periodic interrupts + - Used by the client drivers to register a callback that will be + called on a regular basis through the DMA controller interrupt + + * DMA_SG + - The device supports memory to memory scatter-gather + transfers. + - Even though a plain memcpy can look like a particular case of a + scatter-gather transfer, with a single chunk to transfer, it's a + distinct transaction type in the mem2mem transfers case + + * DMA_PRIVATE + - The devices only supports slave transfers, and as such isn't + available for async transfers. + + * DMA_ASYNC_TX + - Must not be set by the device, and will be set by the framework + if needed + - /* TODO: What is it about? */ + + * DMA_SLAVE + - The device can handle device to memory transfers, including + scatter-gather transfers. + - While in the mem2mem case we were having two distinct types to + deal with a single chunk to copy or a collection of them, here, + we just have a single transaction type that is supposed to + handle both. + - If you want to transfer a single contiguous memory buffer, + simply build a scatter list with only one item. + + * DMA_CYCLIC + - The device can handle cyclic transfers. + - A cyclic transfer is a transfer where the chunk collection will + loop over itself, with the last item pointing to the first. + - It's usually used for audio transfers, where you want to operate + on a single ring buffer that you will fill with your audio data. + + * DMA_INTERLEAVE + - The device supports interleaved transfer. + - These transfers can transfer data from a non-contiguous buffer + to a non-contiguous buffer, opposed to DMA_SLAVE that can + transfer data from a non-contiguous data set to a continuous + destination buffer. + - It's usually used for 2d content transfers, in which case you + want to transfer a portion of uncompressed data directly to the + display to print it + +These various types will also affect how the source and destination +addresses change over time. + +Addresses pointing to RAM are typically incremented (or decremented) +after each transfer. In case of a ring buffer, they may loop +(DMA_CYCLIC). Addresses pointing to a device's register (e.g. a FIFO) +are typically fixed. + +Device operations +----------------- + +Our dma_device structure also requires a few function pointers in +order to implement the actual logic, now that we described what +operations we were able to perform. + +The functions that we have to fill in there, and hence have to +implement, obviously depend on the transaction types you reported as +supported. + + * device_alloc_chan_resources + * device_free_chan_resources + - These functions will be called whenever a driver will call + dma_request_channel or dma_release_channel for the first/last + time on the channel associated to that driver. + - They are in charge of allocating/freeing all the needed + resources in order for that channel to be useful for your + driver. + - These functions can sleep. + + * device_prep_dma_* + - These functions are matching the capabilities you registered + previously. + - These functions all take the buffer or the scatterlist relevant + for the transfer being prepared, and should create a hardware + descriptor or a list of hardware descriptors from it + - These functions can be called from an interrupt context + - Any allocation you might do should be using the GFP_NOWAIT + flag, in order not to potentially sleep, but without depleting + the emergency pool either. + - Drivers should try to pre-allocate any memory they might need + during the transfer setup at probe time to avoid putting to + much pressure on the nowait allocator. + + - It should return a unique instance of the + dma_async_tx_descriptor structure, that further represents this + particular transfer. + + - This structure can be initialized using the function + dma_async_tx_descriptor_init. + - You'll also need to set two fields in this structure: + + flags: + TODO: Can it be modified by the driver itself, or + should it be always the flags passed in the arguments + + + tx_submit: A pointer to a function you have to implement, + that is supposed to push the current + transaction descriptor to a pending queue, waiting + for issue_pending to be called. + + * device_issue_pending + - Takes the first transaction descriptor in the pending queue, + and starts the transfer. Whenever that transfer is done, it + should move to the next transaction in the list. + - This function can be called in an interrupt context + + * device_tx_status + - Should report the bytes left to go over on the given channel + - Should only care about the transaction descriptor passed as + argument, not the currently active one on a given channel + - The tx_state argument might be NULL + - Should use dma_set_residue to report it + - In the case of a cyclic transfer, it should only take into + account the current period. + - This function can be called in an interrupt context. + + * device_control + - Used by client drivers to control and configure the channel it + has a handle on. + - Called with a command and an argument + + The command is one of the values listed by the enum + dma_ctrl_cmd. The valid commands are: + + DMA_PAUSE + + Pauses a transfer on the channel + + This command should operate synchronously on the channel, + pausing right away the work of the given channel + + DMA_RESUME + + Restarts a transfer on the channel + + This command should operate synchronously on the channel, + resuming right away the work of the given channel + + DMA_TERMINATE_ALL + + Aborts all the pending and ongoing transfers on the + channel + + This command should operate synchronously on the channel, + terminating right away all the channels + + DMA_SLAVE_CONFIG + + Reconfigures the channel with passed configuration + + This command should NOT perform synchronously, or on any + currently queued transfers, but only on subsequent ones + + In this case, the function will receive a + dma_slave_config structure pointer as an argument, that + will detail which configuration to use. + + Even though that structure contains a direction field, + this field is deprecated in favor of the direction + argument given to the prep_* functions + + FSLDMA_EXTERNAL_START + + TODO: Why does that even exist? + + The argument is an opaque unsigned long. This actually is a + pointer to a struct dma_slave_config that should be used only + in the DMA_SLAVE_CONFIG. + + * device_slave_caps + - Called through the framework by client drivers in order to have + an idea of what are the properties of the channel allocated to + them. + - Such properties are the buswidth, available directions, etc. + - Required for every generic layer doing DMA transfers, such as + ASoC. + +Misc notes (stuff that should be documented, but don't really know +where to put them) +------------------------------------------------------------------ + * dma_run_dependencies + - Should be called at the end of an async TX transfer, and can be + ignored in the slave transfers case. + - Makes sure that dependent operations are run before marking it + as complete. + + * dma_cookie_t + - it's a DMA transaction ID that will increment over time. + - Not really relevant any more since the introduction of virt-dma + that abstracts it away. + + * DMA_CTRL_ACK + - Undocumented feature + - No one really has an idea of what it's about, besides being + related to reusing the DMA transaction descriptors or having + additional transactions added to it in the async-tx API + - Useless in the case of the slave API + +General Design Notes +-------------------- + +Most of the DMAEngine drivers you'll see are based on a similar design +that handles the end of transfer interrupts in the handler, but defer +most work to a tasklet, including the start of a new transfer whenever +the previous transfer ended. + +This is a rather inefficient design though, because the inter-transfer +latency will be not only the interrupt latency, but also the +scheduling latency of the tasklet, which will leave the channel idle +in between, which will slow down the global transfer rate. + +You should avoid this kind of practice, and instead of electing a new +transfer in your tasklet, move that part to the interrupt handler in +order to have a shorter idle window (that we can't really avoid +anyway). + +Glossary +-------- + +Burst: A number of consecutive read or write operations + that can be queued to buffers before being flushed to + memory. +Chunk: A contiguous collection of bursts +Transfer: A collection of chunks (be it contiguous or not) diff --git a/MAINTAINERS b/MAINTAINERS index e186bf90ed8a..326dc2d1652d 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -1722,6 +1722,13 @@ F: drivers/dma/at_hdmac.c F: drivers/dma/at_hdmac_regs.h F: include/linux/platform_data/dma-atmel.h +ATMEL XDMA DRIVER +M: Ludovic Desroches <ludovic.desroches@atmel.com> +L: linux-arm-kernel@lists.infradead.org +L: dmaengine@vger.kernel.org +S: Supported +F: drivers/dma/at_xdmac.c + ATMEL I2C DRIVER M: Ludovic Desroches <ludovic.desroches@atmel.com> L: linux-i2c@vger.kernel.org @@ -3162,7 +3169,8 @@ Q: https://patchwork.kernel.org/project/linux-dmaengine/list/ S: Maintained F: drivers/dma/ F: include/linux/dma* -T: git git://git.infradead.org/users/vkoul/slave-dma.git (slave-dma) +F: Documentation/dmaengine/ +T: git git://git.infradead.org/users/vkoul/slave-dma.git DME1737 HARDWARE MONITOR DRIVER M: Juerg Haefliger <juergh@gmail.com> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index de469821bc1b..f2b2c4e87aef 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -107,6 +107,13 @@ config AT_HDMAC help Support the Atmel AHB DMA controller. +config AT_XDMAC + tristate "Atmel XDMA support" + depends on ARCH_AT91 + select DMA_ENGINE + help + Support the Atmel XDMA controller. + config FSL_DMA tristate "Freescale Elo series DMA support" depends on FSL_SOC @@ -395,12 +402,12 @@ config XILINX_VDMA config DMA_SUN6I tristate "Allwinner A31 SoCs DMA support" - depends on MACH_SUN6I || COMPILE_TEST + depends on MACH_SUN6I || MACH_SUN8I || COMPILE_TEST depends on RESET_CONTROLLER select DMA_ENGINE select DMA_VIRTUAL_CHANNELS help - Support for the DMA engine for Allwinner A31 SoCs. + Support for the DMA engine first found in Allwinner A31 SoCs. config NBPFAXI_DMA tristate "Renesas Type-AXI NBPF DMA support" diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index cb626c179911..2022b5451377 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/ obj-$(CONFIG_MV_XOR) += mv_xor.o obj-$(CONFIG_DW_DMAC_CORE) += dw/ obj-$(CONFIG_AT_HDMAC) += at_hdmac.o +obj-$(CONFIG_AT_XDMAC) += at_xdmac.o obj-$(CONFIG_MX3_IPU) += ipu/ obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o obj-$(CONFIG_SH_DMAE_BASE) += sh/ diff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c index e34024b000a4..1364d00881dd 100644 --- a/drivers/dma/amba-pl08x.c +++ b/drivers/dma/amba-pl08x.c @@ -2164,7 +2164,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) __func__, ret); goto out_no_memcpy; } - pl08x->memcpy.chancnt = ret; /* Register slave channels */ ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave, @@ -2175,7 +2174,6 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id) __func__, ret); goto out_no_slave; } - pl08x->slave.chancnt = ret; ret = dma_async_device_register(&pl08x->memcpy); if (ret) { diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c new file mode 100644 index 000000000000..b60d77a22df6 --- /dev/null +++ b/drivers/dma/at_xdmac.c @@ -0,0 +1,1524 @@ +/* + * Driver for the Atmel Extensible DMA Controller (aka XDMAC on AT91 systems) + * + * Copyright (C) 2014 Atmel Corporation + * + * Author: Ludovic Desroches <ludovic.desroches@atmel.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <asm/barrier.h> +#include <dt-bindings/dma/at91.h> +#include <linux/clk.h> +#include <linux/dmaengine.h> +#include <linux/dmapool.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/of_dma.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm.h> + +#include "dmaengine.h" + +/* Global registers */ +#define AT_XDMAC_GTYPE 0x00 /* Global Type Register */ +#define AT_XDMAC_NB_CH(i) (((i) & 0x1F) + 1) /* Number of Channels Minus One */ +#define AT_XDMAC_FIFO_SZ(i) (((i) >> 5) & 0x7FF) /* Number of Bytes */ +#define AT_XDMAC_NB_REQ(i) ((((i) >> 16) & 0x3F) + 1) /* Number of Peripheral Requests Minus One */ +#define AT_XDMAC_GCFG 0x04 /* Global Configuration Register */ +#define AT_XDMAC_GWAC 0x08 /* Global Weighted Arbiter Configuration Register */ +#define AT_XDMAC_GIE 0x0C /* Global Interrupt Enable Register */ +#define AT_XDMAC_GID 0x10 /* Global Interrupt Disable Register */ +#define AT_XDMAC_GIM 0x14 /* Global Interrupt Mask Register */ +#define AT_XDMAC_GIS 0x18 /* Global Interrupt Status Register */ +#define AT_XDMAC_GE 0x1C /* Global Channel Enable Register */ +#define AT_XDMAC_GD 0x20 /* Global Channel Disable Register */ +#define AT_XDMAC_GS 0x24 /* Global Channel Status Register */ +#define AT_XDMAC_GRS 0x28 /* Global Channel Read Suspend Register */ +#define AT_XDMAC_GWS 0x2C /* Global Write Suspend Register */ +#define AT_XDMAC_GRWS 0x30 /* Global Channel Read Write Suspend Register */ +#define AT_XDMAC_GRWR 0x34 /* Global Channel Read Write Resume Register */ +#define AT_XDMAC_GSWR 0x38 /* Global Channel Software Request Register */ +#define AT_XDMAC_GSWS 0x3C /* Global channel Software Request Status Register */ +#define AT_XDMAC_GSWF 0x40 /* Global Channel Software Flush Request Register */ +#define AT_XDMAC_VERSION 0xFFC /* XDMAC Version Register */ + +/* Channel relative registers offsets */ +#define AT_XDMAC_CIE 0x00 /* Channel Interrupt Enable Register */ +#define AT_XDMAC_CIE_BIE BIT(0) /* End of Block Interrupt Enable Bit */ +#define AT_XDMAC_CIE_LIE BIT(1) /* End of Linked List Interrupt Enable Bit */ +#define AT_XDMAC_CIE_DIE BIT(2) /* End of Disable Interrupt Enable Bit */ +#define AT_XDMAC_CIE_FIE BIT(3) /* End of Flush Interrupt Enable Bit */ +#define AT_XDMAC_CIE_RBEIE BIT(4) /* Read Bus Error Interrupt Enable Bit */ +#define AT_XDMAC_CIE_WBEIE BIT(5) /* Write Bus Error Interrupt Enable Bit */ +#define AT_XDMAC_CIE_ROIE BIT(6) /* Request Overflow Interrupt Enable Bit */ +#define AT_XDMAC_CID 0x04 /* Channel Interrupt Disable Register */ +#define AT_XDMAC_CID_BID BIT(0) /* End of Block Interrupt Disable Bit */ +#define AT_XDMAC_CID_LID BIT(1) /* End of Linked List Interrupt Disable Bit */ +#define AT_XDMAC_CID_DID BIT(2) /* End of Disable Interrupt Disable Bit */ +#define AT_XDMAC_CID_FID BIT(3) /* End of Flush Interrupt Disable Bit */ +#define AT_XDMAC_CID_RBEID BIT(4) /* Read Bus Error Interrupt Disable Bit */ +#define AT_XDMAC_CID_WBEID BIT(5) /* Write Bus Error Interrupt Disable Bit */ +#define AT_XDMAC_CID_ROID BIT(6) /* Request Overflow Interrupt Disable Bit */ +#define AT_XDMAC_CIM 0x08 /* Channel Interrupt Mask Register */ +#define AT_XDMAC_CIM_BIM BIT(0) /* End of Block Interrupt Mask Bit */ +#define AT_XDMAC_CIM_LIM BIT(1) /* End of Linked List Interrupt Mask Bit */ +#define AT_XDMAC_CIM_DIM BIT(2) /* End of Disable Interrupt Mask Bit */ +#define AT_XDMAC_CIM_FIM BIT(3) /* End of Flush Interrupt Mask Bit */ +#define AT_XDMAC_CIM_RBEIM BIT(4) /* Read Bus Error Interrupt Mask Bit */ +#define AT_XDMAC_CIM_WBEIM BIT(5) /* Write Bus Error Interrupt Mask Bit */ +#define AT_XDMAC_CIM_ROIM BIT(6) /* Request Overflow Interrupt Mask Bit */ +#define AT_XDMAC_CIS 0x0C /* Channel Interrupt Status Register */ +#define AT_XDMAC_CIS_BIS BIT(0) /* End of Block Interrupt Status Bit */ +#define AT_XDMAC_CIS_LIS BIT(1) /* End of Linked List Interrupt Status Bit */ +#define AT_XDMAC_CIS_DIS BIT(2) /* End of Disable Interrupt Status Bit */ +#define AT_XDMAC_CIS_FIS BIT(3) /* End of Flush Interrupt Status Bit */ +#define AT_XDMAC_CIS_RBEIS BIT(4) /* Read Bus Error Interrupt Status Bit */ +#define AT_XDMAC_CIS_WBEIS BIT(5) /* Write Bus Error Interrupt Status Bit */ +#define AT_XDMAC_CIS_ROIS BIT(6) /* Request Overflow Interrupt Status Bit */ +#define AT_XDMAC_CSA 0x10 /* Channel Source Address Register */ +#define AT_XDMAC_CDA 0x14 /* Channel Destination Address Register */ +#define AT_XDMAC_CNDA 0x18 /* Channel Next Descriptor Address Register */ +#define AT_XDMAC_CNDA_NDAIF(i) ((i) & 0x1) /* Channel x Next Descriptor Interface */ +#define AT_XDMAC_CNDA_NDA(i) ((i) & 0xfffffffc) /* Channel x Next Descriptor Address */ +#define AT_XDMAC_CNDC 0x1C /* Channel Next Descriptor Control Register */ +#define AT_XDMAC_CNDC_NDE (0x1 << 0) /* Channel x Next Descriptor Enable */ +#define AT_XDMAC_CNDC_NDSUP (0x1 << 1) /* Channel x Next Descriptor Source Update */ +#define AT_XDMAC_CNDC_NDDUP (0x1 << 2) /* Channel x Next Descriptor Destination Update */ +#define AT_XDMAC_CNDC_NDVIEW_NDV0 (0x0 << 3) /* Channel x Next Descriptor View 0 */ +#define AT_XDMAC_CNDC_NDVIEW_NDV1 (0x1 << 3) /* Channel x Next Descriptor View 1 */ +#define AT_XDMAC_CNDC_NDVIEW_NDV2 (0x2 << 3) /* Channel x Next Descriptor View 2 */ +#define AT_XDMAC_CNDC_NDVIEW_NDV3 (0x3 << 3) /* Channel x Next Descriptor View 3 */ +#define AT_XDMAC_CUBC 0x20 /* Channel Microblock Control Register */ +#define AT_XDMAC_CBC 0x24 /* Channel Block Control Register */ +#define AT_XDMAC_CC 0x28 /* Channel Configuration Register */ +#define AT_XDMAC_CC_TYPE (0x1 << 0) /* Channel Transfer Type */ +#define AT_XDMAC_CC_TYPE_MEM_TRAN (0x0 << 0) /* Memory to Memory Transfer */ +#define AT_XDMAC_CC_TYPE_PER_TRAN (0x1 << 0) /* Peripheral to Memory or Memory to Peripheral Transfer */ +#define AT_XDMAC_CC_MBSIZE_MASK (0x3 << 1) +#define AT_XDMAC_CC_MBSIZE_SINGLE (0x0 << 1) +#define AT_XDMAC_CC_MBSIZE_FOUR (0x1 << 1) +#define AT_XDMAC_CC_MBSIZE_EIGHT (0x2 << 1) +#define AT_XDMAC_CC_MBSIZE_SIXTEEN (0x3 << 1) +#define AT_XDMAC_CC_DSYNC (0x1 << 4) /* Channel Synchronization */ +#define AT_XDMAC_CC_DSYNC_PER2MEM (0x0 << 4) +#define AT_XDMAC_CC_DSYNC_MEM2PER (0x1 << 4) +#define AT_XDMAC_CC_PROT (0x1 << 5) /* Channel Protection */ +#define AT_XDMAC_CC_PROT_SEC (0x0 << 5) +#define AT_XDMAC_CC_PROT_UNSEC (0x1 << 5) +#define AT_XDMAC_CC_SWREQ (0x1 << 6) /* Channel Software Request Trigger */ +#define AT_XDMAC_CC_SWREQ_HWR_CONNECTED (0x0 << 6) +#define AT_XDMAC_CC_SWREQ_SWR_CONNECTED (0x1 << 6) +#define AT_XDMAC_CC_MEMSET (0x1 << 7) /* Channel Fill Block of memory */ +#define AT_XDMAC_CC_MEMSET_NORMAL_MODE (0x0 << 7) +#define AT_XDMAC_CC_MEMSET_HW_MODE (0x1 << 7) +#define AT_XDMAC_CC_CSIZE(i) ((0x7 & (i)) << 8) /* Channel Chunk Size */ +#define AT_XDMAC_CC_DWIDTH_OFFSET 11 +#define AT_XDMAC_CC_DWIDTH_MASK (0x3 << AT_XDMAC_CC_DWIDTH_OFFSET) +#define AT_XDMAC_CC_DWIDTH(i) ((0x3 & (i)) << AT_XDMAC_CC_DWIDTH_OFFSET) /* Channel Data Width */ +#define AT_XDMAC_CC_DWIDTH_BYTE 0x0 +#define AT_XDMAC_CC_DWIDTH_HALFWORD 0x1 +#define AT_XDMAC_CC_DWIDTH_WORD 0x2 +#define AT_XDMAC_CC_DWIDTH_DWORD 0x3 +#define AT_XDMAC_CC_SIF(i) ((0x1 & (i)) << 13) /* Channel Source Interface Identifier */ +#define AT_XDMAC_CC_DIF(i) ((0x1 & (i)) << 14) /* Channel Destination Interface Identifier */ +#define AT_XDMAC_CC_SAM_MASK (0x3 << 16) /* Channel Source Addressing Mode */ +#define AT_XDMAC_CC_SAM_FIXED_AM (0x0 << 16) +#define AT_XDMAC_CC_SAM_INCREMENTED_AM (0x1 << 16) +#define AT_XDMAC_CC_SAM_UBS_AM (0x2 << 16) +#define AT_XDMAC_CC_SAM_UBS_DS_AM (0x3 << 16) +#define AT_XDMAC_CC_DAM_MASK (0x3 << 18) /* Channel Source Addressing Mode */ +#define AT_XDMAC_CC_DAM_FIXED_AM (0x0 << 18) +#define AT_XDMAC_CC_DAM_INCREMENTED_AM (0x1 << 18) +#define AT_XDMAC_CC_DAM_UBS_AM (0x2 << 18) +#define AT_XDMAC_CC_DAM_UBS_DS_AM (0x3 << 18) +#define AT_XDMAC_CC_INITD (0x1 << 21) /* Channel Initialization Terminated (read only) */ +#define AT_XDMAC_CC_INITD_TERMINATED (0x0 << 21) +#define AT_XDMAC_CC_INITD_IN_PROGRESS (0x1 << 21) +#define AT_XDMAC_CC_RDIP (0x1 << 22) /* Read in Progress (read only) */ +#define AT_XDMAC_CC_RDIP_DONE (0x0 << 22) +#define AT_XDMAC_CC_RDIP_IN_PROGRESS (0x1 << 22) +#define AT_XDMAC_CC_WRIP (0x1 << 23) /* Write in Progress (read only) */ +#define AT_XDMAC_CC_WRIP_DONE (0x0 << 23) +#define AT_XDMAC_CC_WRIP_IN_PROGRESS (0x1 << 23) +#define AT_XDMAC_CC_PERID(i) (0x7f & (h) << 24) /* Channel Peripheral Identifier */ +#define AT_XDMAC_CDS_MSP 0x2C /* Channel Data Stride Memory Set Pattern */ +#define AT_XDMAC_CSUS 0x30 /* Channel Source Microblock Stride */ +#define AT_XDMAC_CDUS 0x34 /* Channel Destination Microblock Stride */ + +#define AT_XDMAC_CHAN_REG_BASE 0x50 /* Channel registers base address */ + +/* Microblock control members */ +#define AT_XDMAC_MBR_UBC_UBLEN_MAX 0xFFFFFFUL /* Maximum Microblock Length */ +#define AT_XDMAC_MBR_UBC_NDE (0x1 << 24) /* Next Descriptor Enable */ +#define AT_XDMAC_MBR_UBC_NSEN (0x1 << 25) /* Next Descriptor Source Update */ +#define AT_XDMAC_MBR_UBC_NDEN (0x1 << 26) /* Next Descriptor Destination Update */ +#define AT_XDMAC_MBR_UBC_NDV0 (0x0 << 27) /* Next Descriptor View 0 */ +#define AT_XDMAC_MBR_UBC_NDV1 (0x1 << 27) /* Next Descriptor View 1 */ +#define AT_XDMAC_MBR_UBC_NDV2 (0x2 << 27) /* Next Descriptor View 2 */ +#define AT_XDMAC_MBR_UBC_NDV3 (0x3 << 27) /* Next Descriptor View 3 */ + +#define AT_XDMAC_MAX_CHAN 0x20 + +enum atc_status { + AT_XDMAC_CHAN_IS_CYCLIC = 0, + AT_XDMAC_CHAN_IS_PAUSED, +}; + +/* ----- Channels ----- */ +struct at_xdmac_chan { + struct dma_chan chan; + void __iomem *ch_regs; + u32 mask; /* Channel Mask */ + u32 cfg[3]; /* Channel Configuration Register */ + #define AT_XDMAC_CUR_CFG 0 /* Current channel conf */ + #define AT_XDMAC_DEV_TO_MEM_CFG 1 /* Predifined dev to mem channel conf */ + #define AT_XDMAC_MEM_TO_DEV_CFG 2 /* Predifined mem to dev channel conf */ + u8 perid; /* Peripheral ID */ + u8 perif; /* Peripheral Interface */ + u8 memif; /* Memory Interface */ + u32 per_src_addr; + u32 per_dst_addr; + u32 save_cim; + u32 save_cnda; + u32 save_cndc; + unsigned long status; + struct tasklet_struct tasklet; + + spinlock_t lock; + + struct list_head xfers_list; + struct list_head free_descs_list; +}; + + +/* ----- Controller ----- */ +struct at_xdmac { + struct dma_device dma; + void __iomem *regs; + int irq; + struct clk *clk; + u32 save_gim; + u32 save_gs; + struct dma_pool *at_xdmac_desc_pool; + struct at_xdmac_chan chan[0]; +}; + + +/* ----- Descriptors ----- */ + +/* Linked List Descriptor */ +struct at_xdmac_lld { + dma_addr_t mbr_nda; /* Next Descriptor Member */ + u32 mbr_ubc; /* Microblock Control Member */ + dma_addr_t mbr_sa; /* Source Address Member */ + dma_addr_t mbr_da; /* Destination Address Member */ + u32 mbr_cfg; /* Configuration Register */ +}; + + +struct at_xdmac_desc { + struct at_xdmac_lld lld; + enum dma_transfer_direction direction; + struct dma_async_tx_descriptor tx_dma_desc; + struct list_head desc_node; + /* Following members are only used by the first descriptor */ + bool active_xfer; + unsigned int xfer_size; + struct list_head descs_list; + struct list_head xfer_node; +}; + +static inline void __iomem *at_xdmac_chan_reg_base(struct at_xdmac *atxdmac, unsigned int chan_nb) +{ + return atxdmac->regs + (AT_XDMAC_CHAN_REG_BASE + chan_nb * 0x40); +} + +#define at_xdmac_read(atxdmac, reg) readl_relaxed((atxdmac)->regs + (reg)) +#define at_xdmac_write(atxdmac, reg, value) \ + writel_relaxed((value), (atxdmac)->regs + (reg)) + +#define at_xdmac_chan_read(atchan, reg) readl_relaxed((atchan)->ch_regs + (reg)) +#define at_xdmac_chan_write(atchan, reg, value) writel_relaxed((value), (atchan)->ch_regs + (reg)) + +static inline struct at_xdmac_chan *to_at_xdmac_chan(struct dma_chan *dchan) +{ + return container_of(dchan, struct at_xdmac_chan, chan); +} + +static struct device *chan2dev(struct dma_chan *chan) +{ + return &chan->dev->device; +} + +static inline struct at_xdmac *to_at_xdmac(struct dma_device *ddev) +{ + return container_of(ddev, struct at_xdmac, dma); +} + +static inline struct at_xdmac_desc *txd_to_at_desc(struct dma_async_tx_descriptor *txd) +{ + return container_of(txd, struct at_xdmac_desc, tx_dma_desc); +} + +static inline int at_xdmac_chan_is_cyclic(struct at_xdmac_chan *atchan) +{ + return test_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status); +} + +static inline int at_xdmac_chan_is_paused(struct at_xdmac_chan *atchan) +{ + return test_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); +} + +static inline int at_xdmac_csize(u32 maxburst) +{ + int csize; + + csize = ffs(maxburst) - 1; + if (csize > 4) + csize = -EINVAL; + + return csize; +}; + +static inline u8 at_xdmac_get_dwidth(u32 cfg) +{ + return (cfg & AT_XDMAC_CC_DWIDTH_MASK) >> AT_XDMAC_CC_DWIDTH_OFFSET; +}; + +static unsigned int init_nr_desc_per_channel = 64; +module_param(init_nr_desc_per_channel, uint, 0644); +MODULE_PARM_DESC(init_nr_desc_per_channel, + "initial descriptors per channel (default: 64)"); + + +static bool at_xdmac_chan_is_enabled(struct at_xdmac_chan *atchan) +{ + return at_xdmac_chan_read(atchan, AT_XDMAC_GS) & atchan->mask; +} + +static void at_xdmac_off(struct at_xdmac *atxdmac) +{ + at_xdmac_write(atxdmac, AT_XDMAC_GD, -1L); + + /* Wait that all chans are disabled. */ + while (at_xdmac_read(atxdmac, AT_XDMAC_GS)) + cpu_relax(); + + at_xdmac_write(atxdmac, AT_XDMAC_GID, -1L); +} + +/* Call with lock hold. */ +static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan, + struct at_xdmac_desc *first) +{ + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); + u32 reg; + + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, first); + + if (at_xdmac_chan_is_enabled(atchan)) + return; + + /* Set transfer as active to not try to start it again. */ + first->active_xfer = true; + + /* Tell xdmac where to get the first descriptor. */ + reg = AT_XDMAC_CNDA_NDA(first->tx_dma_desc.phys) + | AT_XDMAC_CNDA_NDAIF(atchan->memif); + at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, reg); + + /* + * When doing memory to memory transfer we need to use the next + * descriptor view 2 since some fields of the configuration register + * depend on transfer size and src/dest addresses. + */ + if (is_slave_direction(first->direction)) { + reg = AT_XDMAC_CNDC_NDVIEW_NDV1; + if (first->direction == DMA_MEM_TO_DEV) + atchan->cfg[AT_XDMAC_CUR_CFG] = + atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG]; + else + atchan->cfg[AT_XDMAC_CUR_CFG] = + atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG]; + at_xdmac_chan_write(atchan, AT_XDMAC_CC, + atchan->cfg[AT_XDMAC_CUR_CFG]); + } else { + /* + * No need to write AT_XDMAC_CC reg, it will be done when the + * descriptor is fecthed. + */ + reg = AT_XDMAC_CNDC_NDVIEW_NDV2; + } + + reg |= AT_XDMAC_CNDC_NDDUP + | AT_XDMAC_CNDC_NDSUP + | AT_XDMAC_CNDC_NDE; + at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, reg); + + dev_vdbg(chan2dev(&atchan->chan), + "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n", + __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), + at_xdmac_chan_read(atchan, AT_XDMAC_CSA), + at_xdmac_chan_read(atchan, AT_XDMAC_CDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); + + at_xdmac_chan_write(atchan, AT_XDMAC_CID, 0xffffffff); + reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE | AT_XDMAC_CIE_ROIE; + /* + * There is no end of list when doing cyclic dma, we need to get + * an interrupt after each periods. + */ + if (at_xdmac_chan_is_cyclic(atchan)) + at_xdmac_chan_write(atchan, AT_XDMAC_CIE, + reg | AT_XDMAC_CIE_BIE); + else + at_xdmac_chan_write(atchan, AT_XDMAC_CIE, + reg | AT_XDMAC_CIE_LIE); + at_xdmac_write(atxdmac, AT_XDMAC_GIE, atchan->mask); + dev_vdbg(chan2dev(&atchan->chan), + "%s: enable channel (0x%08x)\n", __func__, atchan->mask); + wmb(); + at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); + + dev_vdbg(chan2dev(&atchan->chan), + "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n", + __func__, at_xdmac_chan_read(atchan, AT_XDMAC_CC), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), + at_xdmac_chan_read(atchan, AT_XDMAC_CSA), + at_xdmac_chan_read(atchan, AT_XDMAC_CDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); + +} + +static dma_cookie_t at_xdmac_tx_submit(struct dma_async_tx_descriptor *tx) +{ + struct at_xdmac_desc *desc = txd_to_at_desc(tx); + struct at_xdmac_chan *atchan = to_at_xdmac_chan(tx->chan); + dma_cookie_t cookie; + + spin_lock_bh(&atchan->lock); + cookie = dma_cookie_assign(tx); + + dev_vdbg(chan2dev(tx->chan), "%s: atchan 0x%p, add desc 0x%p to xfers_list\n", + __func__, atchan, desc); + list_add_tail(&desc->xfer_node, &atchan->xfers_list); + if (list_is_singular(&atchan->xfers_list)) + at_xdmac_start_xfer(atchan, desc); + + spin_unlock_bh(&atchan->lock); + return cookie; +} + +static struct at_xdmac_desc *at_xdmac_alloc_desc(struct dma_chan *chan, + gfp_t gfp_flags) +{ + struct at_xdmac_desc *desc; + struct at_xdmac *atxdmac = to_at_xdmac(chan->device); + dma_addr_t phys; + + desc = dma_pool_alloc(atxdmac->at_xdmac_desc_pool, gfp_flags, &phys); + if (desc) { + memset(desc, 0, sizeof(*desc)); + INIT_LIST_HEAD(&desc->descs_list); + dma_async_tx_descriptor_init(&desc->tx_dma_desc, chan); + desc->tx_dma_desc.tx_submit = at_xdmac_tx_submit; + desc->tx_dma_desc.phys = phys; + } + + return desc; +} + +/* Call must be protected by lock. */ +static struct at_xdmac_desc *at_xdmac_get_desc(struct at_xdmac_chan *atchan) +{ + struct at_xdmac_desc *desc; + + if (list_empty(&atchan->free_descs_list)) { + desc = at_xdmac_alloc_desc(&atchan->chan, GFP_NOWAIT); + } else { + desc = list_first_entry(&atchan->free_descs_list, + struct at_xdmac_desc, desc_node); + list_del(&desc->desc_node); + desc->active_xfer = false; + } + + return desc; +} + +static struct dma_chan *at_xdmac_xlate(struct of_phandle_args *dma_spec, + struct of_dma *of_dma) +{ + struct at_xdmac *atxdmac = of_dma->of_dma_data; + struct at_xdmac_chan *atchan; + struct dma_chan *chan; + struct device *dev = atxdmac->dma.dev; + + if (dma_spec->args_count != 1) { + dev_err(dev, "dma phandler args: bad number of args\n"); + return NULL; + } + + chan = dma_get_any_slave_channel(&atxdmac->dma); + if (!chan) { + dev_err(dev, "can't get a dma channel\n"); + return NULL; + } + + atchan = to_at_xdmac_chan(chan); + atchan->memif = AT91_XDMAC_DT_GET_MEM_IF(dma_spec->args[0]); + atchan->perif = AT91_XDMAC_DT_GET_PER_IF(dma_spec->args[0]); + atchan->perid = AT91_XDMAC_DT_GET_PERID(dma_spec->args[0]); + dev_dbg(dev, "chan dt cfg: memif=%u perif=%u perid=%u\n", + atchan->memif, atchan->perif, atchan->perid); + + return chan; +} + +static int at_xdmac_set_slave_config(struct dma_chan *chan, + struct dma_slave_config *sconfig) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + u8 dwidth; + int csize; + + atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG] = + AT91_XDMAC_DT_PERID(atchan->perid) + | AT_XDMAC_CC_DAM_INCREMENTED_AM + | AT_XDMAC_CC_SAM_FIXED_AM + | AT_XDMAC_CC_DIF(atchan->memif) + | AT_XDMAC_CC_SIF(atchan->perif) + | AT_XDMAC_CC_SWREQ_HWR_CONNECTED + | AT_XDMAC_CC_DSYNC_PER2MEM + | AT_XDMAC_CC_MBSIZE_SIXTEEN + | AT_XDMAC_CC_TYPE_PER_TRAN; + csize = at_xdmac_csize(sconfig->src_maxburst); + if (csize < 0) { + dev_err(chan2dev(chan), "invalid src maxburst value\n"); + return -EINVAL; + } + atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG] |= AT_XDMAC_CC_CSIZE(csize); + dwidth = ffs(sconfig->src_addr_width) - 1; + atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG] |= AT_XDMAC_CC_DWIDTH(dwidth); + + + atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG] = + AT91_XDMAC_DT_PERID(atchan->perid) + | AT_XDMAC_CC_DAM_FIXED_AM + | AT_XDMAC_CC_SAM_INCREMENTED_AM + | AT_XDMAC_CC_DIF(atchan->perif) + | AT_XDMAC_CC_SIF(atchan->memif) + | AT_XDMAC_CC_SWREQ_HWR_CONNECTED + | AT_XDMAC_CC_DSYNC_MEM2PER + | AT_XDMAC_CC_MBSIZE_SIXTEEN + | AT_XDMAC_CC_TYPE_PER_TRAN; + csize = at_xdmac_csize(sconfig->dst_maxburst); + if (csize < 0) { + dev_err(chan2dev(chan), "invalid src maxburst value\n"); + return -EINVAL; + } + atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG] |= AT_XDMAC_CC_CSIZE(csize); + dwidth = ffs(sconfig->dst_addr_width) - 1; + atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG] |= AT_XDMAC_CC_DWIDTH(dwidth); + + /* Src and dst addr are needed to configure the link list descriptor. */ + atchan->per_src_addr = sconfig->src_addr; + atchan->per_dst_addr = sconfig->dst_addr; + + dev_dbg(chan2dev(chan), + "%s: cfg[dev2mem]=0x%08x, cfg[mem2dev]=0x%08x, per_src_addr=0x%08x, per_dst_addr=0x%08x\n", + __func__, atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG], + atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG], + atchan->per_src_addr, atchan->per_dst_addr); + + return 0; +} + +static struct dma_async_tx_descriptor * +at_xdmac_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac_desc *first = NULL, *prev = NULL; + struct scatterlist *sg; + int i; + u32 cfg; + unsigned int xfer_size = 0; + + if (!sgl) + return NULL; + + if (!is_slave_direction(direction)) { + dev_err(chan2dev(chan), "invalid DMA direction\n"); + return NULL; + } + + dev_dbg(chan2dev(chan), "%s: sg_len=%d, dir=%s, flags=0x%lx\n", + __func__, sg_len, + direction == DMA_MEM_TO_DEV ? "to device" : "from device", + flags); + + /* Protect dma_sconfig field that can be modified by set_slave_conf. */ + spin_lock_bh(&atchan->lock); + + /* Prepare descriptors. */ + for_each_sg(sgl, sg, sg_len, i) { + struct at_xdmac_desc *desc = NULL; + u32 len, mem; + + len = sg_dma_len(sg); + mem = sg_dma_address(sg); + if (unlikely(!len)) { + dev_err(chan2dev(chan), "sg data length is zero\n"); + spin_unlock_bh(&atchan->lock); + return NULL; + } + dev_dbg(chan2dev(chan), "%s: * sg%d len=%u, mem=0x%08x\n", + __func__, i, len, mem); + + desc = at_xdmac_get_desc(atchan); + if (!desc) { + dev_err(chan2dev(chan), "can't get descriptor\n"); + if (first) + list_splice_init(&first->descs_list, &atchan->free_descs_list); + spin_unlock_bh(&atchan->lock); + return NULL; + } + + /* Linked list descriptor setup. */ + if (direction == DMA_DEV_TO_MEM) { + desc->lld.mbr_sa = atchan->per_src_addr; + desc->lld.mbr_da = mem; + cfg = atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG]; + } else { + desc->lld.mbr_sa = mem; + desc->lld.mbr_da = atchan->per_dst_addr; + cfg = atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG]; + } + desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1 /* next descriptor view */ + | AT_XDMAC_MBR_UBC_NDEN /* next descriptor dst parameter update */ + | AT_XDMAC_MBR_UBC_NSEN /* next descriptor src parameter update */ + | (i == sg_len - 1 ? 0 : AT_XDMAC_MBR_UBC_NDE) /* descriptor fetch */ + | len / (1 << at_xdmac_get_dwidth(cfg)); /* microblock length */ + dev_dbg(chan2dev(chan), + "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n", + __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc); + + /* Chain lld. */ + if (prev) { + prev->lld.mbr_nda = desc->tx_dma_desc.phys; + dev_dbg(chan2dev(chan), + "%s: chain lld: prev=0x%p, mbr_nda=%pad\n", + __func__, prev, &prev->lld.mbr_nda); + } + + prev = desc; + if (!first) + first = desc; + + dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", + __func__, desc, first); + list_add_tail(&desc->desc_node, &first->descs_list); + xfer_size += len; + } + + spin_unlock_bh(&atchan->lock); + + first->tx_dma_desc.flags = flags; + first->xfer_size = xfer_size; + first->direction = direction; + + return &first->tx_dma_desc; +} + +static struct dma_async_tx_descriptor * +at_xdmac_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, + size_t buf_len, size_t period_len, + enum dma_transfer_direction direction, + unsigned long flags) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac_desc *first = NULL, *prev = NULL; + unsigned int periods = buf_len / period_len; + int i; + u32 cfg; + + dev_dbg(chan2dev(chan), "%s: buf_addr=%pad, buf_len=%zd, period_len=%zd, dir=%s, flags=0x%lx\n", + __func__, &buf_addr, buf_len, period_len, + direction == DMA_MEM_TO_DEV ? "mem2per" : "per2mem", flags); + + if (!is_slave_direction(direction)) { + dev_err(chan2dev(chan), "invalid DMA direction\n"); + return NULL; + } + + if (test_and_set_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status)) { + dev_err(chan2dev(chan), "channel currently used\n"); + return NULL; + } + + for (i = 0; i < periods; i++) { + struct at_xdmac_desc *desc = NULL; + + spin_lock_bh(&atchan->lock); + desc = at_xdmac_get_desc(atchan); + if (!desc) { + dev_err(chan2dev(chan), "can't get descriptor\n"); + if (first) + list_splice_init(&first->descs_list, &atchan->free_descs_list); + spin_unlock_bh(&atchan->lock); + return NULL; + } + spin_unlock_bh(&atchan->lock); + dev_dbg(chan2dev(chan), + "%s: desc=0x%p, tx_dma_desc.phys=%pad\n", + __func__, desc, &desc->tx_dma_desc.phys); + + if (direction == DMA_DEV_TO_MEM) { + desc->lld.mbr_sa = atchan->per_src_addr; + desc->lld.mbr_da = buf_addr + i * period_len; + cfg = atchan->cfg[AT_XDMAC_DEV_TO_MEM_CFG]; + } else { + desc->lld.mbr_sa = buf_addr + i * period_len; + desc->lld.mbr_da = atchan->per_dst_addr; + cfg = atchan->cfg[AT_XDMAC_MEM_TO_DEV_CFG]; + } + desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV1 + | AT_XDMAC_MBR_UBC_NDEN + | AT_XDMAC_MBR_UBC_NSEN + | AT_XDMAC_MBR_UBC_NDE + | period_len >> at_xdmac_get_dwidth(cfg); + + dev_dbg(chan2dev(chan), + "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x\n", + __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc); + + /* Chain lld. */ + if (prev) { + prev->lld.mbr_nda = desc->tx_dma_desc.phys; + dev_dbg(chan2dev(chan), + "%s: chain lld: prev=0x%p, mbr_nda=%pad\n", + __func__, prev, &prev->lld.mbr_nda); + } + + prev = desc; + if (!first) + first = desc; + + dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", + __func__, desc, first); + list_add_tail(&desc->desc_node, &first->descs_list); + } + + prev->lld.mbr_nda = first->tx_dma_desc.phys; + dev_dbg(chan2dev(chan), + "%s: chain lld: prev=0x%p, mbr_nda=%pad\n", + __func__, prev, &prev->lld.mbr_nda); + first->tx_dma_desc.flags = flags; + first->xfer_size = buf_len; + first->direction = direction; + + return &first->tx_dma_desc; +} + +static struct dma_async_tx_descriptor * +at_xdmac_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, + size_t len, unsigned long flags) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac_desc *first = NULL, *prev = NULL; + size_t remaining_size = len, xfer_size = 0, ublen; + dma_addr_t src_addr = src, dst_addr = dest; + u32 dwidth; + /* + * WARNING: We don't know the direction, it involves we can't + * dynamically set the source and dest interface so we have to use the + * same one. Only interface 0 allows EBI access. Hopefully we can + * access DDR through both ports (at least on SAMA5D4x), so we can use + * the same interface for source and dest, that solves the fact we + * don't know the direction. + */ + u32 chan_cc = AT_XDMAC_CC_DAM_INCREMENTED_AM + | AT_XDMAC_CC_SAM_INCREMENTED_AM + | AT_XDMAC_CC_DIF(0) + | AT_XDMAC_CC_SIF(0) + | AT_XDMAC_CC_MBSIZE_SIXTEEN + | AT_XDMAC_CC_TYPE_MEM_TRAN; + + dev_dbg(chan2dev(chan), "%s: src=%pad, dest=%pad, len=%zd, flags=0x%lx\n", + __func__, &src, &dest, len, flags); + + if (unlikely(!len)) + return NULL; + + /* + * Check address alignment to select the greater data width we can use. + * Some XDMAC implementations don't provide dword transfer, in this + * case selecting dword has the same behavior as selecting word transfers. + */ + if (!((src_addr | dst_addr) & 7)) { + dwidth = AT_XDMAC_CC_DWIDTH_DWORD; + dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__); + } else if (!((src_addr | dst_addr) & 3)) { + dwidth = AT_XDMAC_CC_DWIDTH_WORD; + dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__); + } else if (!((src_addr | dst_addr) & 1)) { + dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD; + dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__); + } else { + dwidth = AT_XDMAC_CC_DWIDTH_BYTE; + dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__); + } + + /* Prepare descriptors. */ + while (remaining_size) { + struct at_xdmac_desc *desc = NULL; + + dev_dbg(chan2dev(chan), "%s: remaining_size=%zu\n", __func__, remaining_size); + + spin_lock_bh(&atchan->lock); + desc = at_xdmac_get_desc(atchan); + spin_unlock_bh(&atchan->lock); + if (!desc) { + dev_err(chan2dev(chan), "can't get descriptor\n"); + if (first) + list_splice_init(&first->descs_list, &atchan->free_descs_list); + return NULL; + } + + /* Update src and dest addresses. */ + src_addr += xfer_size; + dst_addr += xfer_size; + + if (remaining_size >= AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth) + xfer_size = AT_XDMAC_MBR_UBC_UBLEN_MAX << dwidth; + else + xfer_size = remaining_size; + + dev_dbg(chan2dev(chan), "%s: xfer_size=%zu\n", __func__, xfer_size); + + /* Check remaining length and change data width if needed. */ + if (!((src_addr | dst_addr | xfer_size) & 7)) { + dwidth = AT_XDMAC_CC_DWIDTH_DWORD; + dev_dbg(chan2dev(chan), "%s: dwidth: double word\n", __func__); + } else if (!((src_addr | dst_addr | xfer_size) & 3)) { + dwidth = AT_XDMAC_CC_DWIDTH_WORD; + dev_dbg(chan2dev(chan), "%s: dwidth: word\n", __func__); + } else if (!((src_addr | dst_addr | xfer_size) & 1)) { + dwidth = AT_XDMAC_CC_DWIDTH_HALFWORD; + dev_dbg(chan2dev(chan), "%s: dwidth: half word\n", __func__); + } else if ((src_addr | dst_addr | xfer_size) & 1) { + dwidth = AT_XDMAC_CC_DWIDTH_BYTE; + dev_dbg(chan2dev(chan), "%s: dwidth: byte\n", __func__); + } + chan_cc |= AT_XDMAC_CC_DWIDTH(dwidth); + + ublen = xfer_size >> dwidth; + remaining_size -= xfer_size; + + desc->lld.mbr_sa = src_addr; + desc->lld.mbr_da = dst_addr; + desc->lld.mbr_ubc = AT_XDMAC_MBR_UBC_NDV2 + | AT_XDMAC_MBR_UBC_NDEN + | AT_XDMAC_MBR_UBC_NSEN + | (remaining_size ? AT_XDMAC_MBR_UBC_NDE : 0) + | ublen; + desc->lld.mbr_cfg = chan_cc; + + dev_dbg(chan2dev(chan), + "%s: lld: mbr_sa=%pad, mbr_da=%pad, mbr_ubc=0x%08x, mbr_cfg=0x%08x\n", + __func__, &desc->lld.mbr_sa, &desc->lld.mbr_da, desc->lld.mbr_ubc, desc->lld.mbr_cfg); + + /* Chain lld. */ + if (prev) { + prev->lld.mbr_nda = desc->tx_dma_desc.phys; + dev_dbg(chan2dev(chan), + "%s: chain lld: prev=0x%p, mbr_nda=0x%08x\n", + __func__, prev, prev->lld.mbr_nda); + } + + prev = desc; + if (!first) + first = desc; + + dev_dbg(chan2dev(chan), "%s: add desc 0x%p to descs_list 0x%p\n", + __func__, desc, first); + list_add_tail(&desc->desc_node, &first->descs_list); + } + + first->tx_dma_desc.flags = flags; + first->xfer_size = len; + + return &first->tx_dma_desc; +} + +static enum dma_status +at_xdmac_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); + struct at_xdmac_desc *desc, *_desc; + struct list_head *descs_list; + enum dma_status ret; + int residue; + u32 cur_nda, mask, value; + u8 dwidth = at_xdmac_get_dwidth(atchan->cfg[AT_XDMAC_CUR_CFG]); + + ret = dma_cookie_status(chan, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + if (!txstate) + return ret; + + spin_lock_bh(&atchan->lock); + + desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); + + /* + * If the transfer has not been started yet, don't need to compute the + * residue, it's the transfer length. + */ + if (!desc->active_xfer) { + dma_set_residue(txstate, desc->xfer_size); + spin_unlock_bh(&atchan->lock); + return ret; + } + + residue = desc->xfer_size; + /* + * Flush FIFO: only relevant when the transfer is source peripheral + * synchronized. + */ + mask = AT_XDMAC_CC_TYPE | AT_XDMAC_CC_DSYNC; + value = AT_XDMAC_CC_TYPE_PER_TRAN | AT_XDMAC_CC_DSYNC_PER2MEM; + if ((atchan->cfg[AT_XDMAC_CUR_CFG] & mask) == value) { + at_xdmac_write(atxdmac, AT_XDMAC_GSWF, atchan->mask); + while (!(at_xdmac_chan_read(atchan, AT_XDMAC_CIS) & AT_XDMAC_CIS_FIS)) + cpu_relax(); + } + + cur_nda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA) & 0xfffffffc; + /* + * Remove size of all microblocks already transferred and the current + * one. Then add the remaining size to transfer of the current + * microblock. + */ + descs_list = &desc->descs_list; + list_for_each_entry_safe(desc, _desc, descs_list, desc_node) { + residue -= (desc->lld.mbr_ubc & 0xffffff) << dwidth; + if ((desc->lld.mbr_nda & 0xfffffffc) == cur_nda) + break; + } + residue += at_xdmac_chan_read(atchan, AT_XDMAC_CUBC) << dwidth; + + spin_unlock_bh(&atchan->lock); + + dma_set_residue(txstate, residue); + + dev_dbg(chan2dev(chan), + "%s: desc=0x%p, tx_dma_desc.phys=%pad, tx_status=%d, cookie=%d, residue=%d\n", + __func__, desc, &desc->tx_dma_desc.phys, ret, cookie, residue); + + return ret; +} + +/* Call must be protected by lock. */ +static void at_xdmac_remove_xfer(struct at_xdmac_chan *atchan, + struct at_xdmac_desc *desc) +{ + dev_dbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); + + /* + * Remove the transfer from the transfer list then move the transfer + * descriptors into the free descriptors list. + */ + list_del(&desc->xfer_node); + list_splice_init(&desc->descs_list, &atchan->free_descs_list); +} + +static void at_xdmac_advance_work(struct at_xdmac_chan *atchan) +{ + struct at_xdmac_desc *desc; + + spin_lock_bh(&atchan->lock); + + /* + * If channel is enabled, do nothing, advance_work will be triggered + * after the interruption. + */ + if (!at_xdmac_chan_is_enabled(atchan) && !list_empty(&atchan->xfers_list)) { + desc = list_first_entry(&atchan->xfers_list, + struct at_xdmac_desc, + xfer_node); + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); + if (!desc->active_xfer) + at_xdmac_start_xfer(atchan, desc); + } + + spin_unlock_bh(&atchan->lock); +} + +static void at_xdmac_handle_cyclic(struct at_xdmac_chan *atchan) +{ + struct at_xdmac_desc *desc; + struct dma_async_tx_descriptor *txd; + + desc = list_first_entry(&atchan->xfers_list, struct at_xdmac_desc, xfer_node); + txd = &desc->tx_dma_desc; + + if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT)) + txd->callback(txd->callback_param); +} + +static void at_xdmac_tasklet(unsigned long data) +{ + struct at_xdmac_chan *atchan = (struct at_xdmac_chan *)data; + struct at_xdmac_desc *desc; + u32 error_mask; + + dev_dbg(chan2dev(&atchan->chan), "%s: status=0x%08lx\n", + __func__, atchan->status); + + error_mask = AT_XDMAC_CIS_RBEIS + | AT_XDMAC_CIS_WBEIS + | AT_XDMAC_CIS_ROIS; + + if (at_xdmac_chan_is_cyclic(atchan)) { + at_xdmac_handle_cyclic(atchan); + } else if ((atchan->status & AT_XDMAC_CIS_LIS) + || (atchan->status & error_mask)) { + struct dma_async_tx_descriptor *txd; + + if (atchan->status & AT_XDMAC_CIS_RBEIS) + dev_err(chan2dev(&atchan->chan), "read bus error!!!"); + if (atchan->status & AT_XDMAC_CIS_WBEIS) + dev_err(chan2dev(&atchan->chan), "write bus error!!!"); + if (atchan->status & AT_XDMAC_CIS_ROIS) + dev_err(chan2dev(&atchan->chan), "request overflow error!!!"); + + spin_lock_bh(&atchan->lock); + desc = list_first_entry(&atchan->xfers_list, + struct at_xdmac_desc, + xfer_node); + dev_vdbg(chan2dev(&atchan->chan), "%s: desc 0x%p\n", __func__, desc); + BUG_ON(!desc->active_xfer); + + txd = &desc->tx_dma_desc; + + at_xdmac_remove_xfer(atchan, desc); + spin_unlock_bh(&atchan->lock); + + if (!at_xdmac_chan_is_cyclic(atchan)) { + dma_cookie_complete(txd); + if (txd->callback && (txd->flags & DMA_PREP_INTERRUPT)) + txd->callback(txd->callback_param); + } + + dma_run_dependencies(txd); + + at_xdmac_advance_work(atchan); + } +} + +static irqreturn_t at_xdmac_interrupt(int irq, void *dev_id) +{ + struct at_xdmac *atxdmac = (struct at_xdmac *)dev_id; + struct at_xdmac_chan *atchan; + u32 imr, status, pending; + u32 chan_imr, chan_status; + int i, ret = IRQ_NONE; + + do { + imr = at_xdmac_read(atxdmac, AT_XDMAC_GIM); + status = at_xdmac_read(atxdmac, AT_XDMAC_GIS); + pending = status & imr; + + dev_vdbg(atxdmac->dma.dev, + "%s: status=0x%08x, imr=0x%08x, pending=0x%08x\n", + __func__, status, imr, pending); + + if (!pending) + break; + + /* We have to find which channel has generated the interrupt. */ + for (i = 0; i < atxdmac->dma.chancnt; i++) { + if (!((1 << i) & pending)) + continue; + + atchan = &atxdmac->chan[i]; + chan_imr = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); + chan_status = at_xdmac_chan_read(atchan, AT_XDMAC_CIS); + atchan->status = chan_status & chan_imr; + dev_vdbg(atxdmac->dma.dev, + "%s: chan%d: imr=0x%x, status=0x%x\n", + __func__, i, chan_imr, chan_status); + dev_vdbg(chan2dev(&atchan->chan), + "%s: CC=0x%08x CNDA=0x%08x, CNDC=0x%08x, CSA=0x%08x, CDA=0x%08x, CUBC=0x%08x\n", + __func__, + at_xdmac_chan_read(atchan, AT_XDMAC_CC), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CNDC), + at_xdmac_chan_read(atchan, AT_XDMAC_CSA), + at_xdmac_chan_read(atchan, AT_XDMAC_CDA), + at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); + + if (atchan->status & (AT_XDMAC_CIS_RBEIS | AT_XDMAC_CIS_WBEIS)) + at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); + + tasklet_schedule(&atchan->tasklet); + ret = IRQ_HANDLED; + } + + } while (pending); + + return ret; +} + +static void at_xdmac_issue_pending(struct dma_chan *chan) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + + dev_dbg(chan2dev(&atchan->chan), "%s\n", __func__); + + if (!at_xdmac_chan_is_cyclic(atchan)) + at_xdmac_advance_work(atchan); + + return; +} + +static int at_xdmac_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, + unsigned long arg) +{ + struct at_xdmac_desc *desc, *_desc; + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac *atxdmac = to_at_xdmac(atchan->chan.device); + int ret = 0; + + dev_dbg(chan2dev(chan), "%s: cmd=%d\n", __func__, cmd); + + spin_lock_bh(&atchan->lock); + + switch (cmd) { + case DMA_PAUSE: + at_xdmac_write(atxdmac, AT_XDMAC_GRWS, atchan->mask); + set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); + break; + + case DMA_RESUME: + if (!at_xdmac_chan_is_paused(atchan)) + break; + + at_xdmac_write(atxdmac, AT_XDMAC_GRWR, atchan->mask); + clear_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status); + break; + + case DMA_TERMINATE_ALL: + at_xdmac_write(atxdmac, AT_XDMAC_GD, atchan->mask); + while (at_xdmac_read(atxdmac, AT_XDMAC_GS) & atchan->mask) + cpu_relax(); + + /* Cancel all pending transfers. */ + list_for_each_entry_safe(desc, _desc, &atchan->xfers_list, xfer_node) + at_xdmac_remove_xfer(atchan, desc); + + clear_bit(AT_XDMAC_CHAN_IS_CYCLIC, &atchan->status); + break; + + case DMA_SLAVE_CONFIG: + ret = at_xdmac_set_slave_config(chan, + (struct dma_slave_config *)arg); + break; + + default: + dev_err(chan2dev(chan), + "unmanaged or unknown dma control cmd: %d\n", cmd); + ret = -ENXIO; + } + + spin_unlock_bh(&atchan->lock); + + return ret; +} + +static int at_xdmac_alloc_chan_resources(struct dma_chan *chan) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac_desc *desc; + int i; + + spin_lock_bh(&atchan->lock); + + if (at_xdmac_chan_is_enabled(atchan)) { + dev_err(chan2dev(chan), + "can't allocate channel resources (channel enabled)\n"); + i = -EIO; + goto spin_unlock; + } + + if (!list_empty(&atchan->free_descs_list)) { + dev_err(chan2dev(chan), + "can't allocate channel resources (channel not free from a previous use)\n"); + i = -EIO; + goto spin_unlock; + } + + for (i = 0; i < init_nr_desc_per_channel; i++) { + desc = at_xdmac_alloc_desc(chan, GFP_ATOMIC); + if (!desc) { + dev_warn(chan2dev(chan), + "only %d descriptors have been allocated\n", i); + break; + } + list_add_tail(&desc->desc_node, &atchan->free_descs_list); + } + + dma_cookie_init(chan); + + dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i); + +spin_unlock: + spin_unlock_bh(&atchan->lock); + return i; +} + +static void at_xdmac_free_chan_resources(struct dma_chan *chan) +{ + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + struct at_xdmac *atxdmac = to_at_xdmac(chan->device); + struct at_xdmac_desc *desc, *_desc; + + list_for_each_entry_safe(desc, _desc, &atchan->free_descs_list, desc_node) { + dev_dbg(chan2dev(chan), "%s: freeing descriptor %p\n", __func__, desc); + list_del(&desc->desc_node); + dma_pool_free(atxdmac->at_xdmac_desc_pool, desc, desc->tx_dma_desc.phys); + } + + return; +} + +#define AT_XDMAC_DMA_BUSWIDTHS\ + (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) |\ + BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) |\ + BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) |\ + BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) |\ + BIT(DMA_SLAVE_BUSWIDTH_8_BYTES)) + +static int at_xdmac_device_slave_caps(struct dma_chan *dchan, + struct dma_slave_caps *caps) +{ + + caps->src_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; + caps->dstn_addr_widths = AT_XDMAC_DMA_BUSWIDTHS; + caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV); + caps->cmd_pause = true; + caps->cmd_terminate = true; + caps->residue_granularity = DMA_RESIDUE_GRANULARITY_BURST; + + return 0; +} + +#ifdef CONFIG_PM +static int atmel_xdmac_prepare(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at_xdmac *atxdmac = platform_get_drvdata(pdev); + struct dma_chan *chan, *_chan; + + list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + + /* Wait for transfer completion, except in cyclic case. */ + if (at_xdmac_chan_is_enabled(atchan) && !at_xdmac_chan_is_cyclic(atchan)) + return -EAGAIN; + } + return 0; +} +#else +# define atmel_xdmac_prepare NULL +#endif + +#ifdef CONFIG_PM_SLEEP +static int atmel_xdmac_suspend(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at_xdmac *atxdmac = platform_get_drvdata(pdev); + struct dma_chan *chan, *_chan; + + list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { + struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan); + + if (at_xdmac_chan_is_cyclic(atchan)) { + if (!at_xdmac_chan_is_paused(atchan)) + at_xdmac_control(chan, DMA_PAUSE, 0); + atchan->save_cim = at_xdmac_chan_read(atchan, AT_XDMAC_CIM); + atchan->save_cnda = at_xdmac_chan_read(atchan, AT_XDMAC_CNDA); + atchan->save_cndc = at_xdmac_chan_read(atchan, AT_XDMAC_CNDC); + } + } + atxdmac->save_gim = at_xdmac_read(atxdmac, AT_XDMAC_GIM); + + at_xdmac_off(atxdmac); + clk_disable_unprepare(atxdmac->clk); + return 0; +} + +static int atmel_xdmac_resume(struct device *dev) +{ + struct platform_device *pdev = to_platform_device(dev); + struct at_xdmac *atxdmac = platform_get_drvdata(pdev); + struct at_xdmac_chan *atchan; + struct dma_chan *chan, *_chan; + int i; + u32 cfg; + + clk_prepare_enable(atxdmac->clk); + + /* Clear pending interrupts. */ + for (i = 0; i < atxdmac->dma.chancnt; i++) { + atchan = &atxdmac->chan[i]; + while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) + cpu_relax(); + } + + at_xdmac_write(atxdmac, AT_XDMAC_GIE, atxdmac->save_gim); + at_xdmac_write(atxdmac, AT_XDMAC_GE, atxdmac->save_gs); + list_for_each_entry_safe(chan, _chan, &atxdmac->dma.channels, device_node) { + atchan = to_at_xdmac_chan(chan); + cfg = atchan->cfg[AT_XDMAC_CUR_CFG]; + at_xdmac_chan_write(atchan, AT_XDMAC_CC, cfg); + if (at_xdmac_chan_is_cyclic(atchan)) { + at_xdmac_chan_write(atchan, AT_XDMAC_CNDA, atchan->save_cnda); + at_xdmac_chan_write(atchan, AT_XDMAC_CNDC, atchan->save_cndc); + at_xdmac_chan_write(atchan, AT_XDMAC_CIE, atchan->save_cim); + wmb(); + at_xdmac_write(atxdmac, AT_XDMAC_GE, atchan->mask); + } + } + return 0; +} +#endif /* CONFIG_PM_SLEEP */ + +static int at_xdmac_probe(struct platform_device *pdev) +{ + struct resource *res; + struct at_xdmac *atxdmac; + int irq, size, nr_channels, i, ret; + void __iomem *base; + u32 reg; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) + return -EINVAL; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + /* + * Read number of xdmac channels, read helper function can't be used + * since atxdmac is not yet allocated and we need to know the number + * of channels to do the allocation. + */ + reg = readl_relaxed(base + AT_XDMAC_GTYPE); + nr_channels = AT_XDMAC_NB_CH(reg); + if (nr_channels > AT_XDMAC_MAX_CHAN) { + dev_err(&pdev->dev, "invalid number of channels (%u)\n", + nr_channels); + return -EINVAL; + } + + size = sizeof(*atxdmac); + size += nr_channels * sizeof(struct at_xdmac_chan); + atxdmac = devm_kzalloc(&pdev->dev, size, GFP_KERNEL); + if (!atxdmac) { + dev_err(&pdev->dev, "can't allocate at_xdmac structure\n"); + return -ENOMEM; + } + + atxdmac->regs = base; + atxdmac->irq = irq; + + atxdmac->clk = devm_clk_get(&pdev->dev, "dma_clk"); + if (IS_ERR(atxdmac->clk)) { + dev_err(&pdev->dev, "can't get dma_clk\n"); + return PTR_ERR(atxdmac->clk); + } + + /* Do not use dev res to prevent races with tasklet */ + ret = request_irq(atxdmac->irq, at_xdmac_interrupt, 0, "at_xdmac", atxdmac); + if (ret) { + dev_err(&pdev->dev, "can't request irq\n"); + return ret; + } + + ret = clk_prepare_enable(atxdmac->clk); + if (ret) { + dev_err(&pdev->dev, "can't prepare or enable clock\n"); + goto err_free_irq; + } + + atxdmac->at_xdmac_desc_pool = + dmam_pool_create(dev_name(&pdev->dev), &pdev->dev, + sizeof(struct at_xdmac_desc), 4, 0); + if (!atxdmac->at_xdmac_desc_pool) { + dev_err(&pdev->dev, "no memory for descriptors dma pool\n"); + ret = -ENOMEM; + goto err_clk_disable; + } + + dma_cap_set(DMA_CYCLIC, atxdmac->dma.cap_mask); + dma_cap_set(DMA_MEMCPY, atxdmac->dma.cap_mask); + dma_cap_set(DMA_SLAVE, atxdmac->dma.cap_mask); + /* + * Without DMA_PRIVATE the driver is not able to allocate more than + * one channel, second allocation fails in private_candidate. + */ + dma_cap_set(DMA_PRIVATE, atxdmac->dma.cap_mask); + atxdmac->dma.dev = &pdev->dev; + atxdmac->dma.device_alloc_chan_resources = at_xdmac_alloc_chan_resources; + atxdmac->dma.device_free_chan_resources = at_xdmac_free_chan_resources; + atxdmac->dma.device_tx_status = at_xdmac_tx_status; + atxdmac->dma.device_issue_pending = at_xdmac_issue_pending; + atxdmac->dma.device_prep_dma_cyclic = at_xdmac_prep_dma_cyclic; + atxdmac->dma.device_prep_dma_memcpy = at_xdmac_prep_dma_memcpy; + atxdmac->dma.device_prep_slave_sg = at_xdmac_prep_slave_sg; + atxdmac->dma.device_control = at_xdmac_control; + atxdmac->dma.device_slave_caps = at_xdmac_device_slave_caps; + + /* Disable all chans and interrupts. */ + at_xdmac_off(atxdmac); + + /* Init channels. */ + INIT_LIST_HEAD(&atxdmac->dma.channels); + for (i = 0; i < nr_channels; i++) { + struct at_xdmac_chan *atchan = &atxdmac->chan[i]; + + atchan->chan.device = &atxdmac->dma; + list_add_tail(&atchan->chan.device_node, + &atxdmac->dma.channels); + + atchan->ch_regs = at_xdmac_chan_reg_base(atxdmac, i); + atchan->mask = 1 << i; + + spin_lock_init(&atchan->lock); + INIT_LIST_HEAD(&atchan->xfers_list); + INIT_LIST_HEAD(&atchan->free_descs_list); + tasklet_init(&atchan->tasklet, at_xdmac_tasklet, + (unsigned long)atchan); + + /* Clear pending interrupts. */ + while (at_xdmac_chan_read(atchan, AT_XDMAC_CIS)) + cpu_relax(); + } + platform_set_drvdata(pdev, atxdmac); + + ret = dma_async_device_register(&atxdmac->dma); + if (ret) { + dev_err(&pdev->dev, "fail to register DMA engine device\n"); + goto err_clk_disable; + } + + ret = of_dma_controller_register(pdev->dev.of_node, + at_xdmac_xlate, atxdmac); + if (ret) { + dev_err(&pdev->dev, "could not register of dma controller\n"); + goto err_dma_unregister; + } + + dev_info(&pdev->dev, "%d channels, mapped at 0x%p\n", + nr_channels, atxdmac->regs); + + return 0; + +err_dma_unregister: + dma_async_device_unregister(&atxdmac->dma); +err_clk_disable: + clk_disable_unprepare(atxdmac->clk); +err_free_irq: + free_irq(atxdmac->irq, atxdmac->dma.dev); + return ret; +} + +static int at_xdmac_remove(struct platform_device *pdev) +{ + struct at_xdmac *atxdmac = (struct at_xdmac *)platform_get_drvdata(pdev); + int i; + + at_xdmac_off(atxdmac); + of_dma_controller_free(pdev->dev.of_node); + dma_async_device_unregister(&atxdmac->dma); + clk_disable_unprepare(atxdmac->clk); + + synchronize_irq(atxdmac->irq); + + free_irq(atxdmac->irq, atxdmac->dma.dev); + + for (i = 0; i < atxdmac->dma.chancnt; i++) { + struct at_xdmac_chan *atchan = &atxdmac->chan[i]; + + tasklet_kill(&atchan->tasklet); + at_xdmac_free_chan_resources(&atchan->chan); + } + + return 0; +} + +static const struct dev_pm_ops atmel_xdmac_dev_pm_ops = { + .prepare = atmel_xdmac_prepare, + SET_LATE_SYSTEM_SLEEP_PM_OPS(atmel_xdmac_suspend, atmel_xdmac_resume) +}; + +static const struct of_device_id atmel_xdmac_dt_ids[] = { + { + .compatible = "atmel,sama5d4-dma", + }, { + /* sentinel */ + } +}; +MODULE_DEVICE_TABLE(of, atmel_xdmac_dt_ids); + +static struct platform_driver at_xdmac_driver = { + .probe = at_xdmac_probe, + .remove = at_xdmac_remove, + .driver = { + .name = "at_xdmac", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(atmel_xdmac_dt_ids), + .pm = &atmel_xdmac_dev_pm_ops, + } +}; + +static int __init at_xdmac_init(void) +{ + return platform_driver_probe(&at_xdmac_driver, at_xdmac_probe); +} +subsys_initcall(at_xdmac_init); + +MODULE_DESCRIPTION("Atmel Extended DMA Controller driver"); +MODULE_AUTHOR("Ludovic Desroches <ludovic.desroches@atmel.com>"); +MODULE_LICENSE("GPL"); diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c index 68007974961a..918b7b3f766f 100644 --- a/drivers/dma/bcm2835-dma.c +++ b/drivers/dma/bcm2835-dma.c @@ -525,8 +525,6 @@ static int bcm2835_dma_chan_init(struct bcm2835_dmadev *d, int chan_id, int irq) vchan_init(&c->vc, &d->ddev); INIT_LIST_HEAD(&c->node); - d->ddev.chancnt++; - c->chan_base = BCM2835_DMA_CHANIO(d->base, chan_id); c->ch = chan_id; c->irq_number = irq; @@ -694,7 +692,6 @@ static struct platform_driver bcm2835_dma_driver = { .remove = bcm2835_dma_remove, .driver = { .name = "bcm2835-dma", - .owner = THIS_MODULE, .of_match_table = of_match_ptr(bcm2835_dma_of_match), }, }; diff --git a/drivers/dma/cppi41.c b/drivers/dma/cppi41.c index a58eec3b2cad..b743adf56465 100644 --- a/drivers/dma/cppi41.c +++ b/drivers/dma/cppi41.c @@ -1,3 +1,4 @@ +#include <linux/delay.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/platform_device.h> @@ -567,7 +568,7 @@ static int cppi41_tear_down_chan(struct cppi41_channel *c) reg |= GCR_TEARDOWN; cppi_writel(reg, c->gcr_reg); c->td_queued = 1; - c->td_retry = 100; + c->td_retry = 500; } if (!c->td_seen || !c->td_desc_seen) { @@ -603,12 +604,16 @@ static int cppi41_tear_down_chan(struct cppi41_channel *c) * descriptor before the TD we fetch it from enqueue, it has to be * there waiting for us. */ - if (!c->td_seen && c->td_retry) + if (!c->td_seen && c->td_retry) { + udelay(1); return -EAGAIN; - + } WARN_ON(!c->td_retry); + if (!c->td_desc_seen) { desc_phys = cppi41_pop_desc(cdd, c->q_num); + if (!desc_phys) + desc_phys = cppi41_pop_desc(cdd, c->q_comp_num); WARN_ON(!desc_phys); } @@ -1088,7 +1093,6 @@ static struct platform_driver cpp41_dma_driver = { .remove = cppi41_dma_remove, .driver = { .name = "cppi41-dma-engine", - .owner = THIS_MODULE, .pm = &cppi41_pm_ops, .of_match_table = of_match_ptr(cppi41_dma_ids), }, diff --git a/drivers/dma/dma-jz4740.c b/drivers/dma/dma-jz4740.c index ae2ab14e64b3..bdeafeefa5f6 100644 --- a/drivers/dma/dma-jz4740.c +++ b/drivers/dma/dma-jz4740.c @@ -563,10 +563,9 @@ static int jz4740_dma_probe(struct platform_device *pdev) dd->device_prep_dma_cyclic = jz4740_dma_prep_dma_cyclic; dd->device_control = jz4740_dma_control; dd->dev = &pdev->dev; - dd->chancnt = JZ_DMA_NR_CHANS; INIT_LIST_HEAD(&dd->channels); - for (i = 0; i < dd->chancnt; i++) { + for (i = 0; i < JZ_DMA_NR_CHANS; i++) { chan = &dmadev->chan[i]; chan->id = i; chan->vchan.desc_free = jz4740_dma_desc_free; @@ -608,7 +607,6 @@ static struct platform_driver jz4740_dma_driver = { .remove = jz4740_dma_remove, .driver = { .name = "jz4740-dma", - .owner = THIS_MODULE, }, }; module_platform_driver(jz4740_dma_driver); diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 24bfaf0b92ba..e057935e3023 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -330,8 +330,7 @@ static int __init dma_channel_table_init(void) if (err) { pr_err("initialization failure\n"); for_each_dma_cap_mask(cap, dma_cap_mask_all) - if (channel_table[cap]) - free_percpu(channel_table[cap]); + free_percpu(channel_table[cap]); } return err; diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c index 3c5711d5fe97..6fb2e902b459 100644 --- a/drivers/dma/fsl-edma.c +++ b/drivers/dma/fsl-edma.c @@ -118,17 +118,17 @@ BIT(DMA_SLAVE_BUSWIDTH_8_BYTES) struct fsl_edma_hw_tcd { - u32 saddr; - u16 soff; - u16 attr; - u32 nbytes; - u32 slast; - u32 daddr; - u16 doff; - u16 citer; - u32 dlast_sga; - u16 csr; - u16 biter; + __le32 saddr; + __le16 soff; + __le16 attr; + __le32 nbytes; + __le32 slast; + __le32 daddr; + __le16 doff; + __le16 citer; + __le32 dlast_sga; + __le16 csr; + __le16 biter; }; struct fsl_edma_sw_tcd { @@ -175,18 +175,12 @@ struct fsl_edma_engine { }; /* - * R/W functions for big- or little-endian registers - * the eDMA controller's endian is independent of the CPU core's endian. + * R/W functions for big- or little-endian registers: + * The eDMA controller's endian is independent of the CPU core's endian. + * For the big-endian IP module, the offset for 8-bit or 16-bit registers + * should also be swapped opposite to that in little-endian IP. */ -static u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr) -{ - if (edma->big_endian) - return ioread16be(addr); - else - return ioread16(addr); -} - static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr) { if (edma->big_endian) @@ -197,13 +191,18 @@ static u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr) static void edma_writeb(struct fsl_edma_engine *edma, u8 val, void __iomem *addr) { - iowrite8(val, addr); + /* swap the reg offset for these in big-endian mode */ + if (edma->big_endian) + iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3)); + else + iowrite8(val, addr); } static void edma_writew(struct fsl_edma_engine *edma, u16 val, void __iomem *addr) { + /* swap the reg offset for these in big-endian mode */ if (edma->big_endian) - iowrite16be(val, addr); + iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2)); else iowrite16(val, addr); } @@ -254,13 +253,12 @@ static void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan, chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR; ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux; muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux]; + slot = EDMAMUX_CHCFG_SOURCE(slot); if (enable) - edma_writeb(fsl_chan->edma, - EDMAMUX_CHCFG_ENBL | EDMAMUX_CHCFG_SOURCE(slot), - muxaddr + ch_off); + iowrite8(EDMAMUX_CHCFG_ENBL | slot, muxaddr + ch_off); else - edma_writeb(fsl_chan->edma, EDMAMUX_CHCFG_DIS, muxaddr + ch_off); + iowrite8(EDMAMUX_CHCFG_DIS, muxaddr + ch_off); } static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width) @@ -286,9 +284,8 @@ static void fsl_edma_free_desc(struct virt_dma_desc *vdesc) fsl_desc = to_fsl_edma_desc(vdesc); for (i = 0; i < fsl_desc->n_tcds; i++) - dma_pool_free(fsl_desc->echan->tcd_pool, - fsl_desc->tcd[i].vtcd, - fsl_desc->tcd[i].ptcd); + dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd, + fsl_desc->tcd[i].ptcd); kfree(fsl_desc); } @@ -363,8 +360,8 @@ static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan, /* calculate the total size in this desc */ for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++) - len += edma_readl(fsl_chan->edma, &(edesc->tcd[i].vtcd->nbytes)) - * edma_readw(fsl_chan->edma, &(edesc->tcd[i].vtcd->biter)); + len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes) + * le16_to_cpu(edesc->tcd[i].vtcd->biter); if (!in_progress) return len; @@ -376,17 +373,15 @@ static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan, /* figure out the finished and calculate the residue */ for (i = 0; i < fsl_chan->edesc->n_tcds; i++) { - size = edma_readl(fsl_chan->edma, &(edesc->tcd[i].vtcd->nbytes)) - * edma_readw(fsl_chan->edma, &(edesc->tcd[i].vtcd->biter)); + size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes) + * le16_to_cpu(edesc->tcd[i].vtcd->biter); if (dir == DMA_MEM_TO_DEV) - dma_addr = edma_readl(fsl_chan->edma, - &(edesc->tcd[i].vtcd->saddr)); + dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr); else - dma_addr = edma_readl(fsl_chan->edma, - &(edesc->tcd[i].vtcd->daddr)); + dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr); len -= size; - if (cur_addr > dma_addr && cur_addr < dma_addr + size) { + if (cur_addr >= dma_addr && cur_addr < dma_addr + size) { len += dma_addr + size - cur_addr; break; } @@ -424,55 +419,67 @@ static enum dma_status fsl_edma_tx_status(struct dma_chan *chan, return fsl_chan->status; } -static void fsl_edma_set_tcd_params(struct fsl_edma_chan *fsl_chan, - u32 src, u32 dst, u16 attr, u16 soff, u32 nbytes, - u32 slast, u16 citer, u16 biter, u32 doff, u32 dlast_sga, - u16 csr) +static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan, + struct fsl_edma_hw_tcd *tcd) { + struct fsl_edma_engine *edma = fsl_chan->edma; void __iomem *addr = fsl_chan->edma->membase; u32 ch = fsl_chan->vchan.chan.chan_id; /* - * TCD parameters have been swapped in fill_tcd_params(), - * so just write them to registers in the cpu endian here + * TCD parameters are stored in struct fsl_edma_hw_tcd in little + * endian format. However, we need to load the TCD registers in + * big- or little-endian obeying the eDMA engine model endian. */ - writew(0, addr + EDMA_TCD_CSR(ch)); - writel(src, addr + EDMA_TCD_SADDR(ch)); - writel(dst, addr + EDMA_TCD_DADDR(ch)); - writew(attr, addr + EDMA_TCD_ATTR(ch)); - writew(soff, addr + EDMA_TCD_SOFF(ch)); - writel(nbytes, addr + EDMA_TCD_NBYTES(ch)); - writel(slast, addr + EDMA_TCD_SLAST(ch)); - writew(citer, addr + EDMA_TCD_CITER(ch)); - writew(biter, addr + EDMA_TCD_BITER(ch)); - writew(doff, addr + EDMA_TCD_DOFF(ch)); - writel(dlast_sga, addr + EDMA_TCD_DLAST_SGA(ch)); - writew(csr, addr + EDMA_TCD_CSR(ch)); -} - -static void fill_tcd_params(struct fsl_edma_engine *edma, - struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst, - u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer, - u16 biter, u16 doff, u32 dlast_sga, bool major_int, - bool disable_req, bool enable_sg) + edma_writew(edma, 0, addr + EDMA_TCD_CSR(ch)); + edma_writel(edma, le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR(ch)); + edma_writel(edma, le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR(ch)); + + edma_writew(edma, le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR(ch)); + edma_writew(edma, le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF(ch)); + + edma_writel(edma, le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES(ch)); + edma_writel(edma, le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST(ch)); + + edma_writew(edma, le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER(ch)); + edma_writew(edma, le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER(ch)); + edma_writew(edma, le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF(ch)); + + edma_writel(edma, le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA(ch)); + + edma_writew(edma, le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR(ch)); +} + +static inline +void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst, + u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer, + u16 biter, u16 doff, u32 dlast_sga, bool major_int, + bool disable_req, bool enable_sg) { u16 csr = 0; /* - * eDMA hardware SGs require the TCD parameters stored in memory - * the same endian as the eDMA module so that they can be loaded - * automatically by the engine + * eDMA hardware SGs require the TCDs to be stored in little + * endian format irrespective of the register endian model. + * So we put the value in little endian in memory, waiting + * for fsl_edma_set_tcd_regs doing the swap. */ - edma_writel(edma, src, &(tcd->saddr)); - edma_writel(edma, dst, &(tcd->daddr)); - edma_writew(edma, attr, &(tcd->attr)); - edma_writew(edma, EDMA_TCD_SOFF_SOFF(soff), &(tcd->soff)); - edma_writel(edma, EDMA_TCD_NBYTES_NBYTES(nbytes), &(tcd->nbytes)); - edma_writel(edma, EDMA_TCD_SLAST_SLAST(slast), &(tcd->slast)); - edma_writew(edma, EDMA_TCD_CITER_CITER(citer), &(tcd->citer)); - edma_writew(edma, EDMA_TCD_DOFF_DOFF(doff), &(tcd->doff)); - edma_writel(edma, EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga), &(tcd->dlast_sga)); - edma_writew(edma, EDMA_TCD_BITER_BITER(biter), &(tcd->biter)); + tcd->saddr = cpu_to_le32(src); + tcd->daddr = cpu_to_le32(dst); + + tcd->attr = cpu_to_le16(attr); + + tcd->soff = cpu_to_le16(EDMA_TCD_SOFF_SOFF(soff)); + + tcd->nbytes = cpu_to_le32(EDMA_TCD_NBYTES_NBYTES(nbytes)); + tcd->slast = cpu_to_le32(EDMA_TCD_SLAST_SLAST(slast)); + + tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer)); + tcd->doff = cpu_to_le16(EDMA_TCD_DOFF_DOFF(doff)); + + tcd->dlast_sga = cpu_to_le32(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga)); + + tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter)); if (major_int) csr |= EDMA_TCD_CSR_INT_MAJOR; @@ -482,7 +489,7 @@ static void fill_tcd_params(struct fsl_edma_engine *edma, if (enable_sg) csr |= EDMA_TCD_CSR_E_SG; - edma_writew(edma, csr, &(tcd->csr)); + tcd->csr = cpu_to_le16(csr); } static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan, @@ -558,9 +565,9 @@ static struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic( doff = fsl_chan->fsc.addr_width; } - fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, src_addr, - dst_addr, fsl_chan->fsc.attr, soff, nbytes, 0, - iter, iter, doff, last_sg, true, false, true); + fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr, + fsl_chan->fsc.attr, soff, nbytes, 0, iter, + iter, doff, last_sg, true, false, true); dma_buf_next += period_len; } @@ -607,16 +614,16 @@ static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( iter = sg_dma_len(sg) / nbytes; if (i < sg_len - 1) { last_sg = fsl_desc->tcd[(i + 1)].ptcd; - fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, - src_addr, dst_addr, fsl_chan->fsc.attr, - soff, nbytes, 0, iter, iter, doff, last_sg, - false, false, true); + fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, + dst_addr, fsl_chan->fsc.attr, soff, + nbytes, 0, iter, iter, doff, last_sg, + false, false, true); } else { last_sg = 0; - fill_tcd_params(fsl_chan->edma, fsl_desc->tcd[i].vtcd, - src_addr, dst_addr, fsl_chan->fsc.attr, - soff, nbytes, 0, iter, iter, doff, last_sg, - true, true, false); + fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, + dst_addr, fsl_chan->fsc.attr, soff, + nbytes, 0, iter, iter, doff, last_sg, + true, true, false); } } @@ -625,17 +632,13 @@ static struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( static void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan) { - struct fsl_edma_hw_tcd *tcd; struct virt_dma_desc *vdesc; vdesc = vchan_next_desc(&fsl_chan->vchan); if (!vdesc) return; fsl_chan->edesc = to_fsl_edma_desc(vdesc); - tcd = fsl_chan->edesc->tcd[0].vtcd; - fsl_edma_set_tcd_params(fsl_chan, tcd->saddr, tcd->daddr, tcd->attr, - tcd->soff, tcd->nbytes, tcd->slast, tcd->citer, - tcd->biter, tcd->doff, tcd->dlast_sga, tcd->csr); + fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd); fsl_edma_enable_request(fsl_chan); fsl_chan->status = DMA_IN_PROGRESS; } diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c index 994bcb2c6b92..3d8feb5e4c2f 100644 --- a/drivers/dma/fsldma.c +++ b/drivers/dma/fsldma.c @@ -1337,7 +1337,6 @@ static int fsl_dma_chan_probe(struct fsldma_device *fdev, /* Add the channel to DMA device channel list */ list_add_tail(&chan->common.device_node, &fdev->common.channels); - fdev->common.chancnt++; dev_info(fdev->dev, "#%d (%s), irq %d\n", chan->id, compatible, chan->irq != NO_IRQ ? chan->irq : fdev->irq); diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c index 88afc48c2ca7..d0df198f62e9 100644 --- a/drivers/dma/imx-sdma.c +++ b/drivers/dma/imx-sdma.c @@ -729,6 +729,7 @@ static void sdma_get_pc(struct sdma_channel *sdmac, case IMX_DMATYPE_CSPI: case IMX_DMATYPE_EXT: case IMX_DMATYPE_SSI: + case IMX_DMATYPE_SAI: per_2_emi = sdma->script_addrs->app_2_mcu_addr; emi_2_per = sdma->script_addrs->mcu_2_app_addr; break; @@ -1287,7 +1288,8 @@ static void sdma_load_firmware(const struct firmware *fw, void *context) unsigned short *ram_code; if (!fw) { - dev_err(sdma->dev, "firmware not found\n"); + dev_info(sdma->dev, "external firmware not found, using ROM firmware\n"); + /* In this case we just use the ROM firmware. */ return; } @@ -1346,7 +1348,7 @@ static int sdma_get_firmware(struct sdma_engine *sdma, return ret; } -static int __init sdma_init(struct sdma_engine *sdma) +static int sdma_init(struct sdma_engine *sdma) { int i, ret; dma_addr_t ccb_phys; diff --git a/drivers/dma/ioat/dma_v3.c b/drivers/dma/ioat/dma_v3.c index 895f869d6c2c..32eae38291e5 100644 --- a/drivers/dma/ioat/dma_v3.c +++ b/drivers/dma/ioat/dma_v3.c @@ -1265,9 +1265,17 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device) op = IOAT_OP_XOR; dest_dma = dma_map_page(dev, dest, 0, PAGE_SIZE, DMA_FROM_DEVICE); + if (dma_mapping_error(dev, dest_dma)) + goto dma_unmap; + for (i = 0; i < IOAT_NUM_SRC_TEST; i++) + dma_srcs[i] = DMA_ERROR_CODE; + for (i = 0; i < IOAT_NUM_SRC_TEST; i++) { dma_srcs[i] = dma_map_page(dev, xor_srcs[i], 0, PAGE_SIZE, DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_srcs[i])) + goto dma_unmap; + } tx = dma->device_prep_dma_xor(dma_chan, dest_dma, dma_srcs, IOAT_NUM_SRC_TEST, PAGE_SIZE, DMA_PREP_INTERRUPT); @@ -1298,7 +1306,6 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device) goto dma_unmap; } - dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); for (i = 0; i < IOAT_NUM_SRC_TEST; i++) dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, DMA_TO_DEVICE); @@ -1313,6 +1320,8 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device) } dma_sync_single_for_device(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); + dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); + /* skip validate if the capability is not present */ if (!dma_has_cap(DMA_XOR_VAL, dma_chan->device->cap_mask)) goto free_resources; @@ -1327,8 +1336,13 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device) xor_val_result = 1; for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) + dma_srcs[i] = DMA_ERROR_CODE; + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_srcs[i])) + goto dma_unmap; + } tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs, IOAT_NUM_SRC_TEST + 1, PAGE_SIZE, &xor_val_result, DMA_PREP_INTERRUPT); @@ -1374,8 +1388,13 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device) xor_val_result = 0; for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) + dma_srcs[i] = DMA_ERROR_CODE; + for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) { dma_srcs[i] = dma_map_page(dev, xor_val_srcs[i], 0, PAGE_SIZE, DMA_TO_DEVICE); + if (dma_mapping_error(dev, dma_srcs[i])) + goto dma_unmap; + } tx = dma->device_prep_dma_xor_val(dma_chan, dma_srcs, IOAT_NUM_SRC_TEST + 1, PAGE_SIZE, &xor_val_result, DMA_PREP_INTERRUPT); @@ -1417,14 +1436,18 @@ static int ioat_xor_val_self_test(struct ioatdma_device *device) goto free_resources; dma_unmap: if (op == IOAT_OP_XOR) { - dma_unmap_page(dev, dest_dma, PAGE_SIZE, DMA_FROM_DEVICE); + if (dest_dma != DMA_ERROR_CODE) + dma_unmap_page(dev, dest_dma, PAGE_SIZE, + DMA_FROM_DEVICE); for (i = 0; i < IOAT_NUM_SRC_TEST; i++) - dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, - DMA_TO_DEVICE); + if (dma_srcs[i] != DMA_ERROR_CODE) + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, + DMA_TO_DEVICE); } else if (op == IOAT_OP_XOR_VAL) { for (i = 0; i < IOAT_NUM_SRC_TEST + 1; i++) - dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, - DMA_TO_DEVICE); + if (dma_srcs[i] != DMA_ERROR_CODE) + dma_unmap_page(dev, dma_srcs[i], PAGE_SIZE, + DMA_TO_DEVICE); } free_resources: dma->device_free_chan_resources(dma_chan); diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c index c56137bc3868..263d9f6a207e 100644 --- a/drivers/dma/iop-adma.c +++ b/drivers/dma/iop-adma.c @@ -1557,7 +1557,6 @@ static struct platform_driver iop_adma_driver = { .probe = iop_adma_probe, .remove = iop_adma_remove, .driver = { - .owner = THIS_MODULE, .name = "iop-adma", }, }; diff --git a/drivers/dma/k3dma.c b/drivers/dma/k3dma.c index a1f911aaf220..a1de14ab2c51 100644 --- a/drivers/dma/k3dma.c +++ b/drivers/dma/k3dma.c @@ -722,7 +722,6 @@ static int k3_dma_probe(struct platform_device *op) d->slave.device_issue_pending = k3_dma_issue_pending; d->slave.device_control = k3_dma_control; d->slave.copy_align = DMA_ALIGN; - d->slave.chancnt = d->dma_requests; /* init virtual channel */ d->chans = devm_kzalloc(&op->dev, @@ -787,6 +786,7 @@ static int k3_dma_remove(struct platform_device *op) return 0; } +#ifdef CONFIG_PM_SLEEP static int k3_dma_suspend(struct device *dev) { struct k3_dma_dev *d = dev_get_drvdata(dev); @@ -816,13 +816,13 @@ static int k3_dma_resume(struct device *dev) k3_dma_enable_dma(d, true); return 0; } +#endif static SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend, k3_dma_resume); static struct platform_driver k3_pdma_driver = { .driver = { .name = DRIVER_NAME, - .owner = THIS_MODULE, .pm = &k3_dma_pmops, .of_match_table = k3_pdma_dt_ids, }, diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c index a1a4db5721b8..8b8952f35e6c 100644 --- a/drivers/dma/mmp_pdma.c +++ b/drivers/dma/mmp_pdma.c @@ -1098,7 +1098,6 @@ static const struct platform_device_id mmp_pdma_id_table[] = { static struct platform_driver mmp_pdma_driver = { .driver = { .name = "mmp-pdma", - .owner = THIS_MODULE, .of_match_table = mmp_pdma_dt_ids, }, .id_table = mmp_pdma_id_table, diff --git a/drivers/dma/mmp_tdma.c b/drivers/dma/mmp_tdma.c index c6bd015b7165..bfb46957c3dc 100644 --- a/drivers/dma/mmp_tdma.c +++ b/drivers/dma/mmp_tdma.c @@ -703,7 +703,6 @@ static const struct platform_device_id mmp_tdma_id_table[] = { static struct platform_driver mmp_tdma_driver = { .driver = { .name = "mmp-tdma", - .owner = THIS_MODULE, .of_match_table = mmp_tdma_dt_ids, }, .id_table = mmp_tdma_id_table, diff --git a/drivers/dma/mpc512x_dma.c b/drivers/dma/mpc512x_dma.c index 881db2bcb48b..01bec4023de2 100644 --- a/drivers/dma/mpc512x_dma.c +++ b/drivers/dma/mpc512x_dma.c @@ -885,6 +885,7 @@ static int mpc_dma_probe(struct platform_device *op) struct resource res; ulong regs_start, regs_size; int retval, i; + u8 chancnt; mdma = devm_kzalloc(dev, sizeof(struct mpc_dma), GFP_KERNEL); if (!mdma) { @@ -956,10 +957,6 @@ static int mpc_dma_probe(struct platform_device *op) dma = &mdma->dma; dma->dev = dev; - if (mdma->is_mpc8308) - dma->chancnt = MPC8308_DMACHAN_MAX; - else - dma->chancnt = MPC512x_DMACHAN_MAX; dma->device_alloc_chan_resources = mpc_dma_alloc_chan_resources; dma->device_free_chan_resources = mpc_dma_free_chan_resources; dma->device_issue_pending = mpc_dma_issue_pending; @@ -972,7 +969,12 @@ static int mpc_dma_probe(struct platform_device *op) dma_cap_set(DMA_MEMCPY, dma->cap_mask); dma_cap_set(DMA_SLAVE, dma->cap_mask); - for (i = 0; i < dma->chancnt; i++) { + if (mdma->is_mpc8308) + chancnt = MPC8308_DMACHAN_MAX; + else + chancnt = MPC512x_DMACHAN_MAX; + + for (i = 0; i < chancnt; i++) { mchan = &mdma->channels[i]; mchan->chan.device = dma; @@ -1090,7 +1092,6 @@ static struct platform_driver mpc_dma_driver = { .remove = mpc_dma_remove, .driver = { .name = DRV_NAME, - .owner = THIS_MODULE, .of_match_table = mpc_dma_match, }, }; diff --git a/drivers/dma/nbpfaxi.c b/drivers/dma/nbpfaxi.c index bda20e6e1007..d7d61e1a01c3 100644 --- a/drivers/dma/nbpfaxi.c +++ b/drivers/dma/nbpfaxi.c @@ -1500,7 +1500,6 @@ static const struct dev_pm_ops nbpf_pm_ops = { static struct platform_driver nbpf_driver = { .driver = { - .owner = THIS_MODULE, .name = "dma-nbpf", .of_match_table = nbpf_match, .pm = &nbpf_pm_ops, diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c index bbea8243f9e8..6ea1aded7e74 100644 --- a/drivers/dma/omap-dma.c +++ b/drivers/dma/omap-dma.c @@ -1074,8 +1074,6 @@ static int omap_dma_chan_init(struct omap_dmadev *od, int dma_sig) vchan_init(&c->vc, &od->ddev); INIT_LIST_HEAD(&c->node); - od->ddev.chancnt++; - return 0; } diff --git a/drivers/dma/pch_dma.c b/drivers/dma/pch_dma.c index 9f9ca9fe5ce6..6e0e47d76b23 100644 --- a/drivers/dma/pch_dma.c +++ b/drivers/dma/pch_dma.c @@ -997,7 +997,7 @@ static void pch_dma_remove(struct pci_dev *pdev) #define PCI_DEVICE_ID_ML7831_DMA1_8CH 0x8810 #define PCI_DEVICE_ID_ML7831_DMA2_4CH 0x8815 -const struct pci_device_id pch_dma_id_table[] = { +static const struct pci_device_id pch_dma_id_table[] = { { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_8CH), 8 }, { PCI_VDEVICE(INTEL, PCI_DEVICE_ID_EG20T_PCH_DMA_4CH), 4 }, { PCI_VDEVICE(ROHM, PCI_DEVICE_ID_ML7213_DMA1_8CH), 8}, /* UART Video */ diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 19a99743cf52..025b905f6db2 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -2619,6 +2619,9 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) return -ENOMEM; } + pd = &pl330->ddma; + pd->dev = &adev->dev; + pl330->mcbufsz = pdat ? pdat->mcbuf_sz : 0; res = &adev->res; @@ -2655,7 +2658,6 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) if (!add_desc(pl330, GFP_KERNEL, NR_DEFAULT_DESC)) dev_warn(&adev->dev, "unable to allocate desc\n"); - pd = &pl330->ddma; INIT_LIST_HEAD(&pd->channels); /* Initialize channel parameters */ @@ -2692,7 +2694,6 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) list_add_tail(&pch->chan.device_node, &pd->channels); } - pd->dev = &adev->dev; if (pdat) { pd->cap_mask = pdat->cap_mask; } else { @@ -2819,6 +2820,6 @@ static struct amba_driver pl330_driver = { module_amba_driver(pl330_driver); -MODULE_AUTHOR("Jaswinder Singh <jassi.brar@samsung.com>"); +MODULE_AUTHOR("Jaswinder Singh <jassisinghbrar@gmail.com>"); MODULE_DESCRIPTION("API Driver for PL330 DMAC"); MODULE_LICENSE("GPL"); diff --git a/drivers/dma/qcom_bam_dma.c b/drivers/dma/qcom_bam_dma.c index 7a4bbb0f80a5..3122a99ec06b 100644 --- a/drivers/dma/qcom_bam_dma.c +++ b/drivers/dma/qcom_bam_dma.c @@ -79,35 +79,97 @@ struct bam_async_desc { struct bam_desc_hw desc[0]; }; -#define BAM_CTRL 0x0000 -#define BAM_REVISION 0x0004 -#define BAM_SW_REVISION 0x0080 -#define BAM_NUM_PIPES 0x003C -#define BAM_TIMER 0x0040 -#define BAM_TIMER_CTRL 0x0044 -#define BAM_DESC_CNT_TRSHLD 0x0008 -#define BAM_IRQ_SRCS 0x000C -#define BAM_IRQ_SRCS_MSK 0x0010 -#define BAM_IRQ_SRCS_UNMASKED 0x0030 -#define BAM_IRQ_STTS 0x0014 -#define BAM_IRQ_CLR 0x0018 -#define BAM_IRQ_EN 0x001C -#define BAM_CNFG_BITS 0x007C -#define BAM_IRQ_SRCS_EE(ee) (0x0800 + ((ee) * 0x80)) -#define BAM_IRQ_SRCS_MSK_EE(ee) (0x0804 + ((ee) * 0x80)) -#define BAM_P_CTRL(pipe) (0x1000 + ((pipe) * 0x1000)) -#define BAM_P_RST(pipe) (0x1004 + ((pipe) * 0x1000)) -#define BAM_P_HALT(pipe) (0x1008 + ((pipe) * 0x1000)) -#define BAM_P_IRQ_STTS(pipe) (0x1010 + ((pipe) * 0x1000)) -#define BAM_P_IRQ_CLR(pipe) (0x1014 + ((pipe) * 0x1000)) -#define BAM_P_IRQ_EN(pipe) (0x1018 + ((pipe) * 0x1000)) -#define BAM_P_EVNT_DEST_ADDR(pipe) (0x182C + ((pipe) * 0x1000)) -#define BAM_P_EVNT_REG(pipe) (0x1818 + ((pipe) * 0x1000)) -#define BAM_P_SW_OFSTS(pipe) (0x1800 + ((pipe) * 0x1000)) -#define BAM_P_DATA_FIFO_ADDR(pipe) (0x1824 + ((pipe) * 0x1000)) -#define BAM_P_DESC_FIFO_ADDR(pipe) (0x181C + ((pipe) * 0x1000)) -#define BAM_P_EVNT_TRSHLD(pipe) (0x1828 + ((pipe) * 0x1000)) -#define BAM_P_FIFO_SIZES(pipe) (0x1820 + ((pipe) * 0x1000)) +enum bam_reg { + BAM_CTRL, + BAM_REVISION, + BAM_NUM_PIPES, + BAM_DESC_CNT_TRSHLD, + BAM_IRQ_SRCS, + BAM_IRQ_SRCS_MSK, + BAM_IRQ_SRCS_UNMASKED, + BAM_IRQ_STTS, + BAM_IRQ_CLR, + BAM_IRQ_EN, + BAM_CNFG_BITS, + BAM_IRQ_SRCS_EE, + BAM_IRQ_SRCS_MSK_EE, + BAM_P_CTRL, + BAM_P_RST, + BAM_P_HALT, + BAM_P_IRQ_STTS, + BAM_P_IRQ_CLR, + BAM_P_IRQ_EN, + BAM_P_EVNT_DEST_ADDR, + BAM_P_EVNT_REG, + BAM_P_SW_OFSTS, + BAM_P_DATA_FIFO_ADDR, + BAM_P_DESC_FIFO_ADDR, + BAM_P_EVNT_GEN_TRSHLD, + BAM_P_FIFO_SIZES, +}; + +struct reg_offset_data { + u32 base_offset; + unsigned int pipe_mult, evnt_mult, ee_mult; +}; + +static const struct reg_offset_data bam_v1_3_reg_info[] = { + [BAM_CTRL] = { 0x0F80, 0x00, 0x00, 0x00 }, + [BAM_REVISION] = { 0x0F84, 0x00, 0x00, 0x00 }, + [BAM_NUM_PIPES] = { 0x0FBC, 0x00, 0x00, 0x00 }, + [BAM_DESC_CNT_TRSHLD] = { 0x0F88, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS] = { 0x0F8C, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_MSK] = { 0x0F90, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_UNMASKED] = { 0x0FB0, 0x00, 0x00, 0x00 }, + [BAM_IRQ_STTS] = { 0x0F94, 0x00, 0x00, 0x00 }, + [BAM_IRQ_CLR] = { 0x0F98, 0x00, 0x00, 0x00 }, + [BAM_IRQ_EN] = { 0x0F9C, 0x00, 0x00, 0x00 }, + [BAM_CNFG_BITS] = { 0x0FFC, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_EE] = { 0x1800, 0x00, 0x00, 0x80 }, + [BAM_IRQ_SRCS_MSK_EE] = { 0x1804, 0x00, 0x00, 0x80 }, + [BAM_P_CTRL] = { 0x0000, 0x80, 0x00, 0x00 }, + [BAM_P_RST] = { 0x0004, 0x80, 0x00, 0x00 }, + [BAM_P_HALT] = { 0x0008, 0x80, 0x00, 0x00 }, + [BAM_P_IRQ_STTS] = { 0x0010, 0x80, 0x00, 0x00 }, + [BAM_P_IRQ_CLR] = { 0x0014, 0x80, 0x00, 0x00 }, + [BAM_P_IRQ_EN] = { 0x0018, 0x80, 0x00, 0x00 }, + [BAM_P_EVNT_DEST_ADDR] = { 0x102C, 0x00, 0x40, 0x00 }, + [BAM_P_EVNT_REG] = { 0x1018, 0x00, 0x40, 0x00 }, + [BAM_P_SW_OFSTS] = { 0x1000, 0x00, 0x40, 0x00 }, + [BAM_P_DATA_FIFO_ADDR] = { 0x1024, 0x00, 0x40, 0x00 }, + [BAM_P_DESC_FIFO_ADDR] = { 0x101C, 0x00, 0x40, 0x00 }, + [BAM_P_EVNT_GEN_TRSHLD] = { 0x1028, 0x00, 0x40, 0x00 }, + [BAM_P_FIFO_SIZES] = { 0x1020, 0x00, 0x40, 0x00 }, +}; + +static const struct reg_offset_data bam_v1_4_reg_info[] = { + [BAM_CTRL] = { 0x0000, 0x00, 0x00, 0x00 }, + [BAM_REVISION] = { 0x0004, 0x00, 0x00, 0x00 }, + [BAM_NUM_PIPES] = { 0x003C, 0x00, 0x00, 0x00 }, + [BAM_DESC_CNT_TRSHLD] = { 0x0008, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS] = { 0x000C, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_MSK] = { 0x0010, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_UNMASKED] = { 0x0030, 0x00, 0x00, 0x00 }, + [BAM_IRQ_STTS] = { 0x0014, 0x00, 0x00, 0x00 }, + [BAM_IRQ_CLR] = { 0x0018, 0x00, 0x00, 0x00 }, + [BAM_IRQ_EN] = { 0x001C, 0x00, 0x00, 0x00 }, + [BAM_CNFG_BITS] = { 0x007C, 0x00, 0x00, 0x00 }, + [BAM_IRQ_SRCS_EE] = { 0x0800, 0x00, 0x00, 0x80 }, + [BAM_IRQ_SRCS_MSK_EE] = { 0x0804, 0x00, 0x00, 0x80 }, + [BAM_P_CTRL] = { 0x1000, 0x1000, 0x00, 0x00 }, + [BAM_P_RST] = { 0x1004, 0x1000, 0x00, 0x00 }, + [BAM_P_HALT] = { 0x1008, 0x1000, 0x00, 0x00 }, + [BAM_P_IRQ_STTS] = { 0x1010, 0x1000, 0x00, 0x00 }, + [BAM_P_IRQ_CLR] = { 0x1014, 0x1000, 0x00, 0x00 }, + [BAM_P_IRQ_EN] = { 0x1018, 0x1000, 0x00, 0x00 }, + [BAM_P_EVNT_DEST_ADDR] = { 0x102C, 0x00, 0x1000, 0x00 }, + [BAM_P_EVNT_REG] = { 0x1018, 0x00, 0x1000, 0x00 }, + [BAM_P_SW_OFSTS] = { 0x1000, 0x00, 0x1000, 0x00 }, + [BAM_P_DATA_FIFO_ADDR] = { 0x1824, 0x00, 0x1000, 0x00 }, + [BAM_P_DESC_FIFO_ADDR] = { 0x181C, 0x00, 0x1000, 0x00 }, + [BAM_P_EVNT_GEN_TRSHLD] = { 0x1828, 0x00, 0x1000, 0x00 }, + [BAM_P_FIFO_SIZES] = { 0x1820, 0x00, 0x1000, 0x00 }, +}; /* BAM CTRL */ #define BAM_SW_RST BIT(0) @@ -297,6 +359,8 @@ struct bam_device { /* execution environment ID, from DT */ u32 ee; + const struct reg_offset_data *layout; + struct clk *bamclk; int irq; @@ -305,6 +369,23 @@ struct bam_device { }; /** + * bam_addr - returns BAM register address + * @bdev: bam device + * @pipe: pipe instance (ignored when register doesn't have multiple instances) + * @reg: register enum + */ +static inline void __iomem *bam_addr(struct bam_device *bdev, u32 pipe, + enum bam_reg reg) +{ + const struct reg_offset_data r = bdev->layout[reg]; + + return bdev->regs + r.base_offset + + r.pipe_mult * pipe + + r.evnt_mult * pipe + + r.ee_mult * bdev->ee; +} + +/** * bam_reset_channel - Reset individual BAM DMA channel * @bchan: bam channel * @@ -317,8 +398,8 @@ static void bam_reset_channel(struct bam_chan *bchan) lockdep_assert_held(&bchan->vc.lock); /* reset channel */ - writel_relaxed(1, bdev->regs + BAM_P_RST(bchan->id)); - writel_relaxed(0, bdev->regs + BAM_P_RST(bchan->id)); + writel_relaxed(1, bam_addr(bdev, bchan->id, BAM_P_RST)); + writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_RST)); /* don't allow cpu to reorder BAM register accesses done after this */ wmb(); @@ -347,17 +428,18 @@ static void bam_chan_init_hw(struct bam_chan *bchan, * because we allocated 1 more descriptor (8 bytes) than we can use */ writel_relaxed(ALIGN(bchan->fifo_phys, sizeof(struct bam_desc_hw)), - bdev->regs + BAM_P_DESC_FIFO_ADDR(bchan->id)); - writel_relaxed(BAM_DESC_FIFO_SIZE, bdev->regs + - BAM_P_FIFO_SIZES(bchan->id)); + bam_addr(bdev, bchan->id, BAM_P_DESC_FIFO_ADDR)); + writel_relaxed(BAM_DESC_FIFO_SIZE, + bam_addr(bdev, bchan->id, BAM_P_FIFO_SIZES)); /* enable the per pipe interrupts, enable EOT, ERR, and INT irqs */ - writel_relaxed(P_DEFAULT_IRQS_EN, bdev->regs + BAM_P_IRQ_EN(bchan->id)); + writel_relaxed(P_DEFAULT_IRQS_EN, + bam_addr(bdev, bchan->id, BAM_P_IRQ_EN)); /* unmask the specific pipe and EE combo */ - val = readl_relaxed(bdev->regs + BAM_IRQ_SRCS_MSK_EE(bdev->ee)); + val = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); val |= BIT(bchan->id); - writel_relaxed(val, bdev->regs + BAM_IRQ_SRCS_MSK_EE(bdev->ee)); + writel_relaxed(val, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); /* don't allow cpu to reorder the channel enable done below */ wmb(); @@ -367,7 +449,7 @@ static void bam_chan_init_hw(struct bam_chan *bchan, if (dir == DMA_DEV_TO_MEM) val |= P_DIRECTION; - writel_relaxed(val, bdev->regs + BAM_P_CTRL(bchan->id)); + writel_relaxed(val, bam_addr(bdev, bchan->id, BAM_P_CTRL)); bchan->initialized = 1; @@ -432,12 +514,12 @@ static void bam_free_chan(struct dma_chan *chan) bchan->fifo_virt = NULL; /* mask irq for pipe/channel */ - val = readl_relaxed(bdev->regs + BAM_IRQ_SRCS_MSK_EE(bdev->ee)); + val = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); val &= ~BIT(bchan->id); - writel_relaxed(val, bdev->regs + BAM_IRQ_SRCS_MSK_EE(bdev->ee)); + writel_relaxed(val, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); /* disable irq */ - writel_relaxed(0, bdev->regs + BAM_P_IRQ_EN(bchan->id)); + writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_IRQ_EN)); } /** @@ -583,14 +665,14 @@ static int bam_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, switch (cmd) { case DMA_PAUSE: spin_lock_irqsave(&bchan->vc.lock, flag); - writel_relaxed(1, bdev->regs + BAM_P_HALT(bchan->id)); + writel_relaxed(1, bam_addr(bdev, bchan->id, BAM_P_HALT)); bchan->paused = 1; spin_unlock_irqrestore(&bchan->vc.lock, flag); break; case DMA_RESUME: spin_lock_irqsave(&bchan->vc.lock, flag); - writel_relaxed(0, bdev->regs + BAM_P_HALT(bchan->id)); + writel_relaxed(0, bam_addr(bdev, bchan->id, BAM_P_HALT)); bchan->paused = 0; spin_unlock_irqrestore(&bchan->vc.lock, flag); break; @@ -626,7 +708,7 @@ static u32 process_channel_irqs(struct bam_device *bdev) unsigned long flags; struct bam_async_desc *async_desc; - srcs = readl_relaxed(bdev->regs + BAM_IRQ_SRCS_EE(bdev->ee)); + srcs = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_SRCS_EE)); /* return early if no pipe/channel interrupts are present */ if (!(srcs & P_IRQ)) @@ -639,11 +721,9 @@ static u32 process_channel_irqs(struct bam_device *bdev) continue; /* clear pipe irq */ - pipe_stts = readl_relaxed(bdev->regs + - BAM_P_IRQ_STTS(i)); + pipe_stts = readl_relaxed(bam_addr(bdev, i, BAM_P_IRQ_STTS)); - writel_relaxed(pipe_stts, bdev->regs + - BAM_P_IRQ_CLR(i)); + writel_relaxed(pipe_stts, bam_addr(bdev, i, BAM_P_IRQ_CLR)); spin_lock_irqsave(&bchan->vc.lock, flags); async_desc = bchan->curr_txd; @@ -694,12 +774,12 @@ static irqreturn_t bam_dma_irq(int irq, void *data) tasklet_schedule(&bdev->task); if (srcs & BAM_IRQ) - clr_mask = readl_relaxed(bdev->regs + BAM_IRQ_STTS); + clr_mask = readl_relaxed(bam_addr(bdev, 0, BAM_IRQ_STTS)); /* don't allow reorder of the various accesses to the BAM registers */ mb(); - writel_relaxed(clr_mask, bdev->regs + BAM_IRQ_CLR); + writel_relaxed(clr_mask, bam_addr(bdev, 0, BAM_IRQ_CLR)); return IRQ_HANDLED; } @@ -763,7 +843,7 @@ static void bam_apply_new_config(struct bam_chan *bchan, else maxburst = bchan->slave.dst_maxburst; - writel_relaxed(maxburst, bdev->regs + BAM_DESC_CNT_TRSHLD); + writel_relaxed(maxburst, bam_addr(bdev, 0, BAM_DESC_CNT_TRSHLD)); bchan->reconfigure = 0; } @@ -830,7 +910,7 @@ static void bam_start_dma(struct bam_chan *bchan) /* ensure descriptor writes and dma start not reordered */ wmb(); writel_relaxed(bchan->tail * sizeof(struct bam_desc_hw), - bdev->regs + BAM_P_EVNT_REG(bchan->id)); + bam_addr(bdev, bchan->id, BAM_P_EVNT_REG)); } /** @@ -918,43 +998,44 @@ static int bam_init(struct bam_device *bdev) u32 val; /* read revision and configuration information */ - val = readl_relaxed(bdev->regs + BAM_REVISION) >> NUM_EES_SHIFT; + val = readl_relaxed(bam_addr(bdev, 0, BAM_REVISION)) >> NUM_EES_SHIFT; val &= NUM_EES_MASK; /* check that configured EE is within range */ if (bdev->ee >= val) return -EINVAL; - val = readl_relaxed(bdev->regs + BAM_NUM_PIPES); + val = readl_relaxed(bam_addr(bdev, 0, BAM_NUM_PIPES)); bdev->num_channels = val & BAM_NUM_PIPES_MASK; /* s/w reset bam */ /* after reset all pipes are disabled and idle */ - val = readl_relaxed(bdev->regs + BAM_CTRL); + val = readl_relaxed(bam_addr(bdev, 0, BAM_CTRL)); val |= BAM_SW_RST; - writel_relaxed(val, bdev->regs + BAM_CTRL); + writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL)); val &= ~BAM_SW_RST; - writel_relaxed(val, bdev->regs + BAM_CTRL); + writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL)); /* make sure previous stores are visible before enabling BAM */ wmb(); /* enable bam */ val |= BAM_EN; - writel_relaxed(val, bdev->regs + BAM_CTRL); + writel_relaxed(val, bam_addr(bdev, 0, BAM_CTRL)); /* set descriptor threshhold, start with 4 bytes */ - writel_relaxed(DEFAULT_CNT_THRSHLD, bdev->regs + BAM_DESC_CNT_TRSHLD); + writel_relaxed(DEFAULT_CNT_THRSHLD, + bam_addr(bdev, 0, BAM_DESC_CNT_TRSHLD)); /* Enable default set of h/w workarounds, ie all except BAM_FULL_PIPE */ - writel_relaxed(BAM_CNFG_BITS_DEFAULT, bdev->regs + BAM_CNFG_BITS); + writel_relaxed(BAM_CNFG_BITS_DEFAULT, bam_addr(bdev, 0, BAM_CNFG_BITS)); /* enable irqs for errors */ writel_relaxed(BAM_ERROR_EN | BAM_HRESP_ERR_EN, - bdev->regs + BAM_IRQ_EN); + bam_addr(bdev, 0, BAM_IRQ_EN)); /* unmask global bam interrupt */ - writel_relaxed(BAM_IRQ_MSK, bdev->regs + BAM_IRQ_SRCS_MSK_EE(bdev->ee)); + writel_relaxed(BAM_IRQ_MSK, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); return 0; } @@ -969,9 +1050,18 @@ static void bam_channel_init(struct bam_device *bdev, struct bam_chan *bchan, bchan->vc.desc_free = bam_dma_free_desc; } +static const struct of_device_id bam_of_match[] = { + { .compatible = "qcom,bam-v1.3.0", .data = &bam_v1_3_reg_info }, + { .compatible = "qcom,bam-v1.4.0", .data = &bam_v1_4_reg_info }, + {} +}; + +MODULE_DEVICE_TABLE(of, bam_of_match); + static int bam_dma_probe(struct platform_device *pdev) { struct bam_device *bdev; + const struct of_device_id *match; struct resource *iores; int ret, i; @@ -981,6 +1071,14 @@ static int bam_dma_probe(struct platform_device *pdev) bdev->dev = &pdev->dev; + match = of_match_node(bam_of_match, pdev->dev.of_node); + if (!match) { + dev_err(&pdev->dev, "Unsupported BAM module\n"); + return -ENODEV; + } + + bdev->layout = match->data; + iores = platform_get_resource(pdev, IORESOURCE_MEM, 0); bdev->regs = devm_ioremap_resource(&pdev->dev, iores); if (IS_ERR(bdev->regs)) @@ -1084,7 +1182,7 @@ static int bam_dma_remove(struct platform_device *pdev) dma_async_device_unregister(&bdev->common); /* mask all interrupts for this execution environment */ - writel_relaxed(0, bdev->regs + BAM_IRQ_SRCS_MSK_EE(bdev->ee)); + writel_relaxed(0, bam_addr(bdev, 0, BAM_IRQ_SRCS_MSK_EE)); devm_free_irq(bdev->dev, bdev->irq, bdev); @@ -1104,18 +1202,11 @@ static int bam_dma_remove(struct platform_device *pdev) return 0; } -static const struct of_device_id bam_of_match[] = { - { .compatible = "qcom,bam-v1.4.0", }, - {} -}; -MODULE_DEVICE_TABLE(of, bam_of_match); - static struct platform_driver bam_dma_driver = { .probe = bam_dma_probe, .remove = bam_dma_remove, .driver = { .name = "bam-dma-engine", - .owner = THIS_MODULE, .of_match_table = bam_of_match, }, }; diff --git a/drivers/dma/s3c24xx-dma.c b/drivers/dma/s3c24xx-dma.c index 7416572d1e40..6941a77521c3 100644 --- a/drivers/dma/s3c24xx-dma.c +++ b/drivers/dma/s3c24xx-dma.c @@ -1402,7 +1402,6 @@ static int s3c24xx_dma_remove(struct platform_device *pdev) static struct platform_driver s3c24xx_dma_driver = { .driver = { .name = "s3c24xx-dma", - .owner = THIS_MODULE, }, .id_table = s3c24xx_dma_driver_ids, .probe = s3c24xx_dma_probe, diff --git a/drivers/dma/sa11x0-dma.c b/drivers/dma/sa11x0-dma.c index 4b0ef043729a..2329d295efb5 100644 --- a/drivers/dma/sa11x0-dma.c +++ b/drivers/dma/sa11x0-dma.c @@ -829,7 +829,6 @@ static int sa11x0_dma_init_dmadev(struct dma_device *dmadev, { unsigned i; - dmadev->chancnt = ARRAY_SIZE(chan_desc); INIT_LIST_HEAD(&dmadev->channels); dmadev->dev = dev; dmadev->device_alloc_chan_resources = sa11x0_dma_alloc_chan_resources; @@ -838,7 +837,7 @@ static int sa11x0_dma_init_dmadev(struct dma_device *dmadev, dmadev->device_tx_status = sa11x0_dma_tx_status; dmadev->device_issue_pending = sa11x0_dma_issue_pending; - for (i = 0; i < dmadev->chancnt; i++) { + for (i = 0; i < ARRAY_SIZE(chan_desc); i++) { struct sa11x0_dma_chan *c; c = kzalloc(sizeof(*c), GFP_KERNEL); diff --git a/drivers/dma/sh/rcar-audmapp.c b/drivers/dma/sh/rcar-audmapp.c index 80fd2aeb4870..d95bbdd721f4 100644 --- a/drivers/dma/sh/rcar-audmapp.c +++ b/drivers/dma/sh/rcar-audmapp.c @@ -253,7 +253,6 @@ static int audmapp_chan_probe(struct platform_device *pdev, static void audmapp_chan_remove(struct audmapp_device *audev) { - struct dma_device *dma_dev = &audev->shdma_dev.dma_dev; struct shdma_chan *schan; int i; @@ -261,7 +260,6 @@ static void audmapp_chan_remove(struct audmapp_device *audev) BUG_ON(!schan); shdma_chan_remove(schan); } - dma_dev->chancnt = 0; } static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec, @@ -367,7 +365,6 @@ static struct platform_driver audmapp_driver = { .probe = audmapp_probe, .remove = audmapp_remove, .driver = { - .owner = THIS_MODULE, .name = "rcar-audmapp-engine", .of_match_table = audmapp_of_match, }, diff --git a/drivers/dma/sh/rcar-hpbdma.c b/drivers/dma/sh/rcar-hpbdma.c index b212d9471ab5..20a6f6f2a018 100644 --- a/drivers/dma/sh/rcar-hpbdma.c +++ b/drivers/dma/sh/rcar-hpbdma.c @@ -619,7 +619,6 @@ error: static void hpb_dmae_chan_remove(struct hpb_dmae_device *hpbdev) { - struct dma_device *dma_dev = &hpbdev->shdma_dev.dma_dev; struct shdma_chan *schan; int i; @@ -628,7 +627,6 @@ static void hpb_dmae_chan_remove(struct hpb_dmae_device *hpbdev) shdma_chan_remove(schan); } - dma_dev->chancnt = 0; } static int hpb_dmae_remove(struct platform_device *pdev) @@ -655,7 +653,6 @@ static struct platform_driver hpb_dmae_driver = { .remove = hpb_dmae_remove, .shutdown = hpb_dmae_shutdown, .driver = { - .owner = THIS_MODULE, .name = "hpb-dma-engine", }, }; diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c index 42d497416196..3a2adb131d46 100644 --- a/drivers/dma/sh/shdma-base.c +++ b/drivers/dma/sh/shdma-base.c @@ -391,6 +391,8 @@ static dma_async_tx_callback __ld_cleanup(struct shdma_chan *schan, bool all) dev_dbg(schan->dev, "Bring down channel %d\n", schan->id); pm_runtime_put(schan->dev); schan->pm_state = SHDMA_PM_ESTABLISHED; + } else if (schan->pm_state == SHDMA_PM_PENDING) { + shdma_chan_xfer_ld_queue(schan); } } } @@ -951,7 +953,7 @@ void shdma_chan_probe(struct shdma_dev *sdev, /* Add the channel to DMA device channel list */ list_add_tail(&schan->dma_chan.device_node, &sdev->dma_dev.channels); - sdev->schan[sdev->dma_dev.chancnt++] = schan; + sdev->schan[id] = schan; } EXPORT_SYMBOL(shdma_chan_probe); diff --git a/drivers/dma/sh/shdma-of.c b/drivers/dma/sh/shdma-of.c index b4ff9d3e56d1..f999f9b0d314 100644 --- a/drivers/dma/sh/shdma-of.c +++ b/drivers/dma/sh/shdma-of.c @@ -66,7 +66,6 @@ MODULE_DEVICE_TABLE(of, sh_dmae_of_match); static struct platform_driver shdma_of = { .driver = { - .owner = THIS_MODULE, .name = "shdma-of", .of_match_table = shdma_of_match, }, diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c index 58eb85770eba..b65317c6ea4e 100644 --- a/drivers/dma/sh/shdmac.c +++ b/drivers/dma/sh/shdmac.c @@ -572,7 +572,6 @@ err_no_irq: static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) { - struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev; struct shdma_chan *schan; int i; @@ -581,7 +580,6 @@ static void sh_dmae_chan_remove(struct sh_dmae_device *shdev) shdma_chan_remove(schan); } - dma_dev->chancnt = 0; } static void sh_dmae_shutdown(struct platform_device *pdev) diff --git a/drivers/dma/sh/sudmac.c b/drivers/dma/sh/sudmac.c index 3ce103909896..6da2eaa6c294 100644 --- a/drivers/dma/sh/sudmac.c +++ b/drivers/dma/sh/sudmac.c @@ -295,7 +295,6 @@ err_no_irq: static void sudmac_chan_remove(struct sudmac_device *su_dev) { - struct dma_device *dma_dev = &su_dev->shdma_dev.dma_dev; struct shdma_chan *schan; int i; @@ -304,7 +303,6 @@ static void sudmac_chan_remove(struct sudmac_device *su_dev) shdma_chan_remove(schan); } - dma_dev->chancnt = 0; } static dma_addr_t sudmac_slave_addr(struct shdma_chan *schan) @@ -411,7 +409,6 @@ static int sudmac_remove(struct platform_device *pdev) static struct platform_driver sudmac_driver = { .driver = { - .owner = THIS_MODULE, .name = SUDMAC_DRV_NAME, }, .probe = sudmac_probe, diff --git a/drivers/dma/sirf-dma.c b/drivers/dma/sirf-dma.c index aac03ab10c54..feb1e8ab8d7b 100644 --- a/drivers/dma/sirf-dma.c +++ b/drivers/dma/sirf-dma.c @@ -735,7 +735,6 @@ static int sirfsoc_dma_probe(struct platform_device *op) dma = &sdma->dma; dma->dev = dev; - dma->chancnt = SIRFSOC_DMA_CHANNELS; dma->device_alloc_chan_resources = sirfsoc_dma_alloc_chan_resources; dma->device_free_chan_resources = sirfsoc_dma_free_chan_resources; @@ -752,7 +751,7 @@ static int sirfsoc_dma_probe(struct platform_device *op) dma_cap_set(DMA_INTERLEAVE, dma->cap_mask); dma_cap_set(DMA_PRIVATE, dma->cap_mask); - for (i = 0; i < dma->chancnt; i++) { + for (i = 0; i < SIRFSOC_DMA_CHANNELS; i++) { schan = &sdma->channels[i]; schan->chan.device = dma; @@ -835,6 +834,7 @@ static int sirfsoc_dma_runtime_resume(struct device *dev) return 0; } +#ifdef CONFIG_PM_SLEEP static int sirfsoc_dma_pm_suspend(struct device *dev) { struct sirfsoc_dma *sdma = dev_get_drvdata(dev); @@ -916,6 +916,7 @@ static int sirfsoc_dma_pm_resume(struct device *dev) return 0; } +#endif static const struct dev_pm_ops sirfsoc_dma_pm_ops = { SET_RUNTIME_PM_OPS(sirfsoc_dma_runtime_suspend, sirfsoc_dma_runtime_resume, NULL) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index d9ca3e32d748..4d0710648b08 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -3432,6 +3432,7 @@ static int __init d40_lcla_allocate(struct d40_base *base) d40_err(base->dev, "Failed to allocate %d pages.\n", base->lcla_pool.pages); + ret = -ENOMEM; for (j = 0; j < i; j++) free_pages(page_list[j], base->lcla_pool.pages); diff --git a/drivers/dma/sun6i-dma.c b/drivers/dma/sun6i-dma.c index 91292f5513ff..159f1736a16f 100644 --- a/drivers/dma/sun6i-dma.c +++ b/drivers/dma/sun6i-dma.c @@ -18,6 +18,7 @@ #include <linux/interrupt.h> #include <linux/module.h> #include <linux/of_dma.h> +#include <linux/of_device.h> #include <linux/platform_device.h> #include <linux/reset.h> #include <linux/slab.h> @@ -26,24 +27,6 @@ #include "virt-dma.h" /* - * There's 16 physical channels that can work in parallel. - * - * However we have 30 different endpoints for our requests. - * - * Since the channels are able to handle only an unidirectional - * transfer, we need to allocate more virtual channels so that - * everyone can grab one channel. - * - * Some devices can't work in both direction (mostly because it - * wouldn't make sense), so we have a bit fewer virtual channels than - * 2 channels per endpoints. - */ - -#define NR_MAX_CHANNELS 16 -#define NR_MAX_REQUESTS 30 -#define NR_MAX_VCHANS 53 - -/* * Common registers */ #define DMA_IRQ_EN(x) ((x) * 0x04) @@ -60,6 +43,12 @@ #define DMA_STAT 0x30 /* + * sun8i specific registers + */ +#define SUN8I_DMA_GATE 0x20 +#define SUN8I_DMA_GATE_ENABLE 0x4 + +/* * Channels specific registers */ #define DMA_CHAN_ENABLE 0x00 @@ -102,6 +91,19 @@ #define DRQ_SDRAM 1 /* + * Hardware channels / ports representation + * + * The hardware is used in several SoCs, with differing numbers + * of channels and endpoints. This structure ties those numbers + * to a certain compatible string. + */ +struct sun6i_dma_config { + u32 nr_max_channels; + u32 nr_max_requests; + u32 nr_max_vchans; +}; + +/* * Hardware representation of the LLI * * The hardware will be fed the physical address of this structure, @@ -159,6 +161,7 @@ struct sun6i_dma_dev { struct dma_pool *pool; struct sun6i_pchan *pchans; struct sun6i_vchan *vchans; + const struct sun6i_dma_config *cfg; }; static struct device *chan2dev(struct dma_chan *chan) @@ -426,6 +429,7 @@ static int sun6i_dma_start_desc(struct sun6i_vchan *vchan) static void sun6i_dma_tasklet(unsigned long data) { struct sun6i_dma_dev *sdev = (struct sun6i_dma_dev *)data; + const struct sun6i_dma_config *cfg = sdev->cfg; struct sun6i_vchan *vchan; struct sun6i_pchan *pchan; unsigned int pchan_alloc = 0; @@ -453,7 +457,7 @@ static void sun6i_dma_tasklet(unsigned long data) } spin_lock_irq(&sdev->lock); - for (pchan_idx = 0; pchan_idx < NR_MAX_CHANNELS; pchan_idx++) { + for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) { pchan = &sdev->pchans[pchan_idx]; if (pchan->vchan || list_empty(&sdev->pending)) @@ -474,7 +478,7 @@ static void sun6i_dma_tasklet(unsigned long data) } spin_unlock_irq(&sdev->lock); - for (pchan_idx = 0; pchan_idx < NR_MAX_CHANNELS; pchan_idx++) { + for (pchan_idx = 0; pchan_idx < cfg->nr_max_channels; pchan_idx++) { if (!(pchan_alloc & BIT(pchan_idx))) continue; @@ -496,7 +500,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id) int i, j, ret = IRQ_NONE; u32 status; - for (i = 0; i < 2; i++) { + for (i = 0; i < sdev->cfg->nr_max_channels / DMA_IRQ_CHAN_NR; i++) { status = readl(sdev->base + DMA_IRQ_STAT(i)); if (!status) continue; @@ -506,7 +510,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id) writel(status, sdev->base + DMA_IRQ_STAT(i)); - for (j = 0; (j < 8) && status; j++) { + for (j = 0; (j < DMA_IRQ_CHAN_NR) && status; j++) { if (status & DMA_IRQ_QUEUE) { pchan = sdev->pchans + j; vchan = pchan->vchan; @@ -519,7 +523,7 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id) } } - status = status >> 4; + status = status >> DMA_IRQ_CHAN_WIDTH; } if (!atomic_read(&sdev->tasklet_shutdown)) @@ -815,7 +819,7 @@ static struct dma_chan *sun6i_dma_of_xlate(struct of_phandle_args *dma_spec, struct dma_chan *chan; u8 port = dma_spec->args[0]; - if (port > NR_MAX_REQUESTS) + if (port > sdev->cfg->nr_max_requests) return NULL; chan = dma_get_any_slave_channel(&sdev->slave); @@ -848,7 +852,7 @@ static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev) { int i; - for (i = 0; i < NR_MAX_VCHANS; i++) { + for (i = 0; i < sdev->cfg->nr_max_vchans; i++) { struct sun6i_vchan *vchan = &sdev->vchans[i]; list_del(&vchan->vc.chan.device_node); @@ -856,8 +860,48 @@ static inline void sun6i_dma_free(struct sun6i_dma_dev *sdev) } } +/* + * For A31: + * + * There's 16 physical channels that can work in parallel. + * + * However we have 30 different endpoints for our requests. + * + * Since the channels are able to handle only an unidirectional + * transfer, we need to allocate more virtual channels so that + * everyone can grab one channel. + * + * Some devices can't work in both direction (mostly because it + * wouldn't make sense), so we have a bit fewer virtual channels than + * 2 channels per endpoints. + */ + +static struct sun6i_dma_config sun6i_a31_dma_cfg = { + .nr_max_channels = 16, + .nr_max_requests = 30, + .nr_max_vchans = 53, +}; + +/* + * The A23 only has 8 physical channels, a maximum DRQ port id of 24, + * and a total of 37 usable source and destination endpoints. + */ + +static struct sun6i_dma_config sun8i_a23_dma_cfg = { + .nr_max_channels = 8, + .nr_max_requests = 24, + .nr_max_vchans = 37, +}; + +static struct of_device_id sun6i_dma_match[] = { + { .compatible = "allwinner,sun6i-a31-dma", .data = &sun6i_a31_dma_cfg }, + { .compatible = "allwinner,sun8i-a23-dma", .data = &sun8i_a23_dma_cfg }, + { /* sentinel */ } +}; + static int sun6i_dma_probe(struct platform_device *pdev) { + const struct of_device_id *device; struct sun6i_dma_dev *sdc; struct resource *res; int ret, i; @@ -866,6 +910,11 @@ static int sun6i_dma_probe(struct platform_device *pdev) if (!sdc) return -ENOMEM; + device = of_match_device(sun6i_dma_match, &pdev->dev); + if (!device) + return -ENODEV; + sdc->cfg = device->data; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); sdc->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(sdc->base)) @@ -912,31 +961,30 @@ static int sun6i_dma_probe(struct platform_device *pdev) sdc->slave.device_prep_slave_sg = sun6i_dma_prep_slave_sg; sdc->slave.device_prep_dma_memcpy = sun6i_dma_prep_dma_memcpy; sdc->slave.device_control = sun6i_dma_control; - sdc->slave.chancnt = NR_MAX_VCHANS; sdc->slave.copy_align = 4; sdc->slave.dev = &pdev->dev; - sdc->pchans = devm_kcalloc(&pdev->dev, NR_MAX_CHANNELS, + sdc->pchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_channels, sizeof(struct sun6i_pchan), GFP_KERNEL); if (!sdc->pchans) return -ENOMEM; - sdc->vchans = devm_kcalloc(&pdev->dev, NR_MAX_VCHANS, + sdc->vchans = devm_kcalloc(&pdev->dev, sdc->cfg->nr_max_vchans, sizeof(struct sun6i_vchan), GFP_KERNEL); if (!sdc->vchans) return -ENOMEM; tasklet_init(&sdc->task, sun6i_dma_tasklet, (unsigned long)sdc); - for (i = 0; i < NR_MAX_CHANNELS; i++) { + for (i = 0; i < sdc->cfg->nr_max_channels; i++) { struct sun6i_pchan *pchan = &sdc->pchans[i]; pchan->idx = i; pchan->base = sdc->base + 0x100 + i * 0x40; } - for (i = 0; i < NR_MAX_VCHANS; i++) { + for (i = 0; i < sdc->cfg->nr_max_vchans; i++) { struct sun6i_vchan *vchan = &sdc->vchans[i]; INIT_LIST_HEAD(&vchan->node); @@ -976,6 +1024,15 @@ static int sun6i_dma_probe(struct platform_device *pdev) goto err_dma_unregister; } + /* + * sun8i variant requires us to toggle a dma gating register, + * as seen in Allwinner's SDK. This register is not documented + * in the A23 user manual. + */ + if (of_device_is_compatible(pdev->dev.of_node, + "allwinner,sun8i-a23-dma")) + writel(SUN8I_DMA_GATE_ENABLE, sdc->base + SUN8I_DMA_GATE); + return 0; err_dma_unregister: @@ -1008,11 +1065,6 @@ static int sun6i_dma_remove(struct platform_device *pdev) return 0; } -static struct of_device_id sun6i_dma_match[] = { - { .compatible = "allwinner,sun6i-a31-dma" }, - { /* sentinel */ } -}; - static struct platform_driver sun6i_dma_driver = { .probe = sun6i_dma_probe, .remove = sun6i_dma_remove, diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index 1c867d0303db..d8450c3f35f0 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -1597,7 +1597,6 @@ static const struct dev_pm_ops tegra_dma_dev_pm_ops = { static struct platform_driver tegra_dmac_driver = { .driver = { .name = "tegra-apbdma", - .owner = THIS_MODULE, .pm = &tegra_dma_dev_pm_ops, .of_match_table = tegra_dma_of_match, }, diff --git a/drivers/dma/timb_dma.c b/drivers/dma/timb_dma.c index 4506a7b4f972..2407ccf1a64b 100644 --- a/drivers/dma/timb_dma.c +++ b/drivers/dma/timb_dma.c @@ -783,7 +783,6 @@ static int td_remove(struct platform_device *pdev) static struct platform_driver td_driver = { .driver = { .name = DRIVER_NAME, - .owner = THIS_MODULE, }, .probe = td_probe, .remove = td_remove, diff --git a/drivers/dma/xilinx/xilinx_vdma.c b/drivers/dma/xilinx/xilinx_vdma.c index a6e64767186e..4a3a8f3137b3 100644 --- a/drivers/dma/xilinx/xilinx_vdma.c +++ b/drivers/dma/xilinx/xilinx_vdma.c @@ -942,6 +942,9 @@ xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan, if (!xt->numf || !xt->sgl[0].size) return NULL; + if (xt->frame_size != 1) + return NULL; + /* Allocate a transaction descriptor. */ desc = xilinx_vdma_alloc_tx_descriptor(chan); if (!desc) @@ -960,7 +963,7 @@ xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan, hw = &segment->hw; hw->vsize = xt->numf; hw->hsize = xt->sgl[0].size; - hw->stride = xt->sgl[0].icg << + hw->stride = (xt->sgl[0].icg + xt->sgl[0].size) << XILINX_VDMA_FRMDLY_STRIDE_STRIDE_SHIFT; hw->stride |= chan->config.frm_dly << XILINX_VDMA_FRMDLY_STRIDE_FRMDLY_SHIFT; @@ -971,9 +974,11 @@ xilinx_vdma_dma_prep_interleaved(struct dma_chan *dchan, hw->buf_addr = xt->src_start; /* Link the previous next descriptor to current */ - prev = list_last_entry(&desc->segments, - struct xilinx_vdma_tx_segment, node); - prev->hw.next_desc = segment->phys; + if (!list_empty(&desc->segments)) { + prev = list_last_entry(&desc->segments, + struct xilinx_vdma_tx_segment, node); + prev->hw.next_desc = segment->phys; + } /* Insert the segment into the descriptor segments list. */ list_add_tail(&segment->node, &desc->segments); diff --git a/include/dt-bindings/dma/at91.h b/include/dt-bindings/dma/at91.h index e835037a77b4..ab6cbba45401 100644 --- a/include/dt-bindings/dma/at91.h +++ b/include/dt-bindings/dma/at91.h @@ -9,6 +9,8 @@ #ifndef __DT_BINDINGS_AT91_DMA_H__ #define __DT_BINDINGS_AT91_DMA_H__ +/* ---------- HDMAC ---------- */ + /* * Source and/or destination peripheral ID */ @@ -24,4 +26,27 @@ #define AT91_DMA_CFG_FIFOCFG_ALAP (0x1 << AT91_DMA_CFG_FIFOCFG_OFFSET) /* largest defined AHB burst */ #define AT91_DMA_CFG_FIFOCFG_ASAP (0x2 << AT91_DMA_CFG_FIFOCFG_OFFSET) /* single AHB access */ + +/* ---------- XDMAC ---------- */ +#define AT91_XDMAC_DT_MEM_IF_MASK (0x1) +#define AT91_XDMAC_DT_MEM_IF_OFFSET (13) +#define AT91_XDMAC_DT_MEM_IF(mem_if) (((mem_if) & AT91_XDMAC_DT_MEM_IF_MASK) \ + << AT91_XDMAC_DT_MEM_IF_OFFSET) +#define AT91_XDMAC_DT_GET_MEM_IF(cfg) (((cfg) >> AT91_XDMAC_DT_MEM_IF_OFFSET) \ + & AT91_XDMAC_DT_MEM_IF_MASK) + +#define AT91_XDMAC_DT_PER_IF_MASK (0x1) +#define AT91_XDMAC_DT_PER_IF_OFFSET (14) +#define AT91_XDMAC_DT_PER_IF(per_if) (((per_if) & AT91_XDMAC_DT_PER_IF_MASK) \ + << AT91_XDMAC_DT_PER_IF_OFFSET) +#define AT91_XDMAC_DT_GET_PER_IF(cfg) (((cfg) >> AT91_XDMAC_DT_PER_IF_OFFSET) \ + & AT91_XDMAC_DT_PER_IF_MASK) + +#define AT91_XDMAC_DT_PERID_MASK (0x7f) +#define AT91_XDMAC_DT_PERID_OFFSET (24) +#define AT91_XDMAC_DT_PERID(perid) (((perid) & AT91_XDMAC_DT_PERID_MASK) \ + << AT91_XDMAC_DT_PERID_OFFSET) +#define AT91_XDMAC_DT_GET_PERID(cfg) (((cfg) >> AT91_XDMAC_DT_PERID_OFFSET) \ + & AT91_XDMAC_DT_PERID_MASK) + #endif /* __DT_BINDINGS_AT91_DMA_H__ */ diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index 653a1fd07ae8..40cd75e21ea2 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -447,7 +447,8 @@ struct dmaengine_unmap_data { * communicate status * @phys: physical address of the descriptor * @chan: target channel for this operation - * @tx_submit: set the prepared descriptor(s) to be executed by the engine + * @tx_submit: accept the descriptor, assign ordered cookie and mark the + * descriptor pending. To be pushed on .issue_pending() call * @callback: routine to call after this operation is complete * @callback_param: general parameter to pass to the callback routine * ---async_tx api specific fields--- diff --git a/include/linux/platform_data/dma-imx.h b/include/linux/platform_data/dma-imx.h index 6a1357d31871..7d964e787299 100644 --- a/include/linux/platform_data/dma-imx.h +++ b/include/linux/platform_data/dma-imx.h @@ -41,6 +41,7 @@ enum sdma_peripheral_type { IMX_DMATYPE_ESAI, /* ESAI */ IMX_DMATYPE_SSI_DUAL, /* SSI Dual FIFO */ IMX_DMATYPE_ASRC_SP, /* Shared ASRC */ + IMX_DMATYPE_SAI, /* SAI */ }; enum imx_dma_prio { |