aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/spi
AgeCommit message (Collapse)AuthorFilesLines
2010-11-18spi: davinci: fix DMA event generation stoppageBrian Niebuhr1-15/+3
Do not stop SPI DMA event generation in either transmit or receive DMA event call back because the single setting affects both transmit and receive event generation. Depending on the order in which the callbacks happen, transmit or receive events can get unintentionally stalled. Instead, disable event generation once after both the transmit and receive DMA completes. While at it, remove the largely under-used function to set or clear DMA event generation. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: use edma_write_slot() to setup EDMA PaRAM slotBrian Niebuhr1-15/+19
Currently a series of EDMA API calls are being made to setup various aspects of EDMA PaRAM slots for receive and transmit. Instead setup the PaRAM using a local structure and write once to the hardware using edma_write_slot() Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: always start receive DMABrian Niebuhr1-28/+42
In keeping with the full duplex nature of the SPI bus. Always start receive DMA along with transmit DMA. If there is no receive buffer provided with the transfer, use a temporary buffer to receive the data to be thrown away. [michael.williamson@criticallink.com: receive DMA size should be same as transfer length to avoid hang-up when transfer length is smaller than temporary rx buffer size (rx buffer not provided)] Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: do not use temporary buffer if no transmit data providedBrian Niebuhr1-31/+21
Remove usage of temporary buffer when no transmit data is provided. Instead, use the transmit register itself as the source of data. By choosing the transmit register itself as the source of data, this patch helps remove unnecessary accesses to memory when no real data is being transmitted. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: always start transmit DMABrian Niebuhr1-13/+9
Due to the full duplex nature of the SPI bus, the SPI master on DaVinci needs transmit to be active even if the tranfer is only meant to collect receive data. The current code achieves this by using a temporary zeroed buffer to provide DMA data in case the transfer does not have a transmit buffer provided. However, the transmit DMA is started only if transmit buffer is provided rendering the temporary buffer unused. Instead the code relies on a write to SPIDAT1 register to trigger transmit operation. This however only sends two bytes of data. Fix this by starting transmit DMA always. This changes exposes a bug on DM355 where the CSHOLD bit in SPIDAT1 needs to be written to in between transfers. Handle that by introducing a "cshold_bug" platform data which is set to true for DM355. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: do not store DMA channel information per chip selectBrian Niebuhr1-29/+18
Do not store DMA channel related information per chip-select since that information does not depend on the chip select. The same DMA channels can be used for transfers on all chip-selects since the transfer happens one-at-a-time. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove unnecessary call to davinci_spi_setup_transfer()Brian Niebuhr1-8/+3
Remove unnecessary call to davinci_spi_setup_transfer() at the end of davinci_spi_setup(). davinci_spi_setup_transfer() is registered as the setup_transfer callback for the bitbang layer and is called independently by the bitbang layer to setup the transfer before it begins. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove unnecessary function davinci_spi_bufs_prep()Brian Niebuhr1-43/+21
The function davinci_spi_bufs_prep() is doing stuff that davinci_spi_setup() is doing. Eliminate it and move the work to davinci_spi_setup() Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: configure the invariable bits in spipc0 only onceBrian Niebuhr1-3/+5
Configure the data-in, data-out and clock functionality pins in SPIPC0 register only once during probe. No need to set these bits for each transfer. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: add support for interrupt modeBrian Niebuhr1-30/+115
Add support for SPI interrupt mode operation. Define a per chip-select "io type" variable which specifies if the transfers on this chip-select should happen in interrupt mode or polled mode. Introduce a new function davinci_spi_process_events() to help consolidate the code between interrupt mode processing and polled mode processing. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: simplify poll mode transfersBrian Niebuhr1-53/+39
Use the fact that the get_tx and get_rx can now cope with NULL buffer pointers to simplify the poll mode transfer code. While at it, check for SPI errors every transfer rather than at the end of the whole transfer. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove non-useful interrupt mode supportBrian Niebuhr1-107/+19
The interrupt mode support as it stands is another version of poll mode. Even when interrupt mode is selected, the code tight loops on interrupt status register, rendering it totally useless. A completion variable is initialized, but never used. Remove this fake interrupt mode since users can anyway use poll mode with no functional difference. A usefully implemented interrupt mode support can be added later. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove unnecessary completion variable initializationBrian Niebuhr1-2/+0
The completion variable 'done' is unnecessarly initialized by the function davinci_spi_bufs_dma() where as it is not used for DMA transfers at all. Remove the unnecessary initialization. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: do not treat Tx interrupt being set as errorSekhar Nori1-4/+0
In davinci_spi_check_error(), Tx interrupt being set is treated as error. This function is only meant to flag bus error conditions and Tx interrupt being set at that point is not a bus error but rather a driver bug. Stop checking for Tx interrupt and flagging that as an IO error. Tested-By: Michael Williamson <michael.williamson@criticallink.com> Tested-By: Brian Niebuhr <bniebuhr@efjohnson.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove unnecessary 'count' variable in driver private dataBrian Niebuhr1-7/+3
The variable count in DaVinci SPI driver's private data is largely unused and its minor use can easily be eliminated. Remove the variable. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove unnecessary disable of SPIBrian Niebuhr1-2/+0
In the davinci_spi_bufs_dma() function, SPI is briefly disabled before enabling it immediately back again. Remove this unnecessary disable. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: check for NULL buffer pointer before using itBrian Niebuhr1-18/+22
In the davinci_spi_{tx|rx}_u{8|16}() functions, check for buffer pointer being valid before using it. While providing for better error checking, this change will help simplify code in the caller. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: simplify calculation of edma acount valueBrian Niebuhr1-22/+3
The EDMA acount (called data_type in davinci_spi_bufs_dma()) is simply the bytes_per_word obtained in the transfer setup function. The current code calculates the acount value from bytes_per_word in a convoluted manner. Simplify the code. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: eliminate unnecessary update of davinci_spi->countBrian Niebuhr1-6/+0
The count member of davinci_spi is internal to the driver and is not shared with framework. Eliminate its unnecessary update. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: eliminate the single member structure davinci_spi_slaveBrian Niebuhr1-9/+5
The struct davinci_spi_slave has a single member. Eliminate it and store the per-chipselect data in struct davinci_spi directly. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove unused members of davinci_spi_slaveBrian Niebuhr1-5/+0
Several members of struct davinci_spi_slave are unused in code. Remove such members. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: add support for wait enable timeoutsBrian Niebuhr1-9/+27
Just enabling WAITENA in SPIFMTn register waits for the enable signal from the slave indefinitely. Allow support for finite waiting by adding support for c2e delay (maximum time for addressed slave to respond) and t2e delay (maximum time for slave to respond after transmit data finished). While at it, modify the T2C and C2T defines by prepending the register name as is the convention followed for other register field elsewhere in the driver. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: setup chip-select timers values only if timer enabledBrian Niebuhr1-17/+4
Setup chip-select timers values only if timer is enabled (timer_disbled in spi configuration is false). As a nice side effect, this patch removes code duplicated in davinci_spi_bufs_pio() and davinci_spi_bufs_dma(). Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: consolidate setup of SPIFMTn in one functionBrian Niebuhr1-105/+49
Consolidate the setup of SPIFMTn register under davinci_spi_setup_transfer() simplifying the code and avoiding unnecessary reads and writes to the register. The two inline functions {set|clear}_fmt_bits() can be eliminated because of this. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: make chip-slect specific parameters really chip-select specificBrian Niebuhr1-30/+37
Some chip-select specific paramterers like wdelay, parity, usage of chip-select timers (and the actual timer values) are included in platform data forcing the same behaviour across all chip-selects. Create a new davinci_spi_config data structure which can be passed along using controller_data member of spi_device data structure on a per-device basis. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove 'wait_enable' platform data memberBrian Niebuhr1-1/+1
The SPI_READY bit of struct spi_device:mode serves the purpose of letting the SPI master know if the slave can signal if it is ready for transfer or not. The 'wait_enable' platform data was duplicating this functionality. Use the framework provided method of indicating this capability. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: simplify prescalar calculationBrian Niebuhr1-22/+31
Simplify pre-scalar calculation and move it into a seprate function. Refuse to correct invalid pre-scalar values silently as this might lead to unexpected bugs and lower performance. Instead an error will force users to dig into the root-cause of the issue. While at it, remove some device specific checks on the maximum SPI frequency. As the driver supports the SPI interface implemented on various devices, it should only take care of core SPI limitations and leave the device specific handling to platform code. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: enable GPIO lines to be used as chip selectsBrian Niebuhr1-7/+32
Sometimes, the chip selects provided by SPI module are muxed with other functionality and cannot be used in some designs. In such cases, it becomes convenient to use an available GPIO line as chip select. This patch enables the DaVinci SPI driver to treat specific GPIO lines as chip selects based on information provided in platform data. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove unnecessary data transmit on CS disableBrian Niebuhr1-12/+8
On TI DaVinci's SPI controller, the SPIDAT1 register which controls the chip slect status, also has data transmit register in the lower 16 bits. Writing to the whole 32-bits triggers an additional data transmit every time the chip select is disabled. While most SPI slaves cope-up with this, some cannot. This patch fixes this by doing a 16-bit write on the upper half of the SPIDAT1 register While at it, group the SPIGCR1 register related defines seperately from SPIDAT1 register defines. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: enable both activation and deactivation of chip-selectsBrian Niebuhr1-35/+18
Let davinci_spi_chipselect() perform both activation and deactivation of chip selects. This lets spi_bitbang fully control chip select activation, as intended by the SPI API. With this change, the chip select activation code need not be duplicated in davinci_spi_bufs_{pio|dma}(). Also, keeping chip select active control is removed as a platform data and simply controlled using information from spi_bitbang on whether chip slect should be activated or de-activated. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: set chip-select mode in SPIDEF only onceBrian Niebuhr1-2/+2
Quit writing the same constant value determining the chip-select mode when no transmissions are in progress in davinci_spi_chipelect(). Instead just setup the SPIDEF register once during probe. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove unnecessary typecastSekhar Nori1-2/+1
The typecasting of SPI base address to davinci_spi_reg is unused. Remove it. Tested-By: Michael Williamson <michael.williamson@criticallink.com> Tested-By: Brian Niebuhr <bniebuhr@efjohnson.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: removed unused #definesSekhar Nori1-30/+1
Remove unused defines from code which should help in easy reading of code. Also, use the opportuinity to keep the SPIGCR1 register defines together. Tested-By: Michael Williamson <michael.williamson@criticallink.com> Tested-By: Brian Niebuhr <bniebuhr@efjohnson.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: remove unused variable 'pdata'Brian Niebuhr1-8/+0
The 'pdata' variable is unused in couple of routines. Remove such occurences. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: whitespace cleanupBrian Niebuhr1-12/+10
Cleanup unnecessary white space from various parts of the file. Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-18spi: davinci: fix checkpatch errorsBrian Niebuhr1-1/+1
Fix the following checkpatch error: WARNING: unnecessary whitespace before a quoted newline + dev_info(&pdev->dev, "Controller at 0x%p \n", davinci_spi->base); Signed-off-by: Brian Niebuhr <bniebuhr@efjohnson.com> Tested-By: Michael Williamson <michael.williamson@criticallink.com> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
2010-11-14drivers/spi: Remove unnecessary semicolonsJoe Perches2-2/+2
Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-11-09spi/xilinx: merge OF support code into main driverGrant Likely5-175/+45
Now that the of_platform_bus_type has been merged with the platform bus type, a single platform driver can handle both OF and non-OF use cases. This patch merges the OF support into the platform driver. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Michal Simek <monstr@monstr.eu>
2010-11-09spi/xilinx: fold platform_driver support into main bodyGrant Likely4-118/+73
This patch merges the platform driver support into the main body of xilinx_spi.c in preparation for merging the OF and non-OF support code. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Michal Simek <monstr@monstr.eu>
2010-11-09spi/xilinx: Eliminate pdata references from common code.Grant Likely4-25/+12
The current code has the OF binding modifying the platform_data pointer which it must not do, and the common code doesn't really need to use a pdata pointer. This patch eliminates the platform_data references from the common part of the driver in preparation for merging the OF and non-OF versions. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Tested-by: Michal Simek <monstr@monstr.eu>
2010-11-01tree-wide: fix comment/printk typosUwe Kleine-König2-3/+3
"gadget", "through", "command", "maintain", "maintain", "controller", "address", "between", "initiali[zs]e", "instead", "function", "select", "already", "equal", "access", "management", "hierarchy", "registration", "interest", "relative", "memory", "offset", "already", Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2010-11-01Merge branch 'next-spi' of git://git.secretlab.ca/git/linux-2.6Linus Torvalds2-51/+69
* 'next-spi' of git://git.secretlab.ca/git/linux-2.6: spi/pl022: fix erroneous platform data in U300 spi: fixed odd static string conventions in core code spi/bfin_spi: only request GPIO on first load spi/bfin_spi: handle error/status changes after data interrupts spi: enable spi_board_info to be registered after spi_master
2010-10-25Merge branch 'for-next' of git://android.git.kernel.org/kernel/tegraLinus Torvalds3-0/+626
* 'for-next' of git://android.git.kernel.org/kernel/tegra: spi: tegra: fix error setting on timeout spi: add spi_tegra driver tegra: harmony: enable PCI Express tegra: add PCI Express support tegra: add PCI Express clocks [ARM] tegra: Add APB DMA support [ARM] tegra: Add cpufreq support [ARM] tegra: common: Update common clock init table [ARM] tegra: clock: Add dvfs support, bug fixes, and cleanups [ARM] tegra: Add support for reading fuses [ARM] tegra: gpio: Add suspend and wake support [ARM] tegra: pinmux: add safe values, move tegra2, add suspend [ARM] tegra: add suspend and mirror irqs to legacy controller [ARM] tegra: Add legacy irq support [ARM] tegra: update iomap
2010-10-25spi: tegra: fix error setting on timeoutErik Gilling1-4/+4
avoids derefencing an uninitialized pointer Change-Id: Icf528441ae481e9f6f5ddc0be32c7c217fa49701 Signed-off-by: Erik Gilling <konkers@android.com>
2010-10-22Merge branch 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bklLinus Torvalds2-0/+2
* 'llseek' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/bkl: vfs: make no_llseek the default vfs: don't use BKL in default_llseek llseek: automatically add .llseek fop libfs: use generic_file_llseek for simple_attr mac80211: disallow seeks in minstrel debug code lirc: make chardev nonseekable viotape: use noop_llseek raw: use explicit llseek file operations ibmasmfs: use generic_file_llseek spufs: use llseek in all file operations arm/omap: use generic_file_llseek in iommu_debug lkdtm: use generic_file_llseek in debugfs net/wireless: use generic_file_llseek in debugfs drm: use noop_llseek
2010-10-22spi: fixed odd static string conventions in core codeLinus Walleij1-5/+5
This patch removes convention of passing a static string as a parameter to another static string. The convention is intended to reduce text usage by sharing the common bits of the string, but the implementation is inherently fragile (a change to one format string but not the other will nullify any possible advantage), it isn't necessarily a net win depending on what this compiler does, and it it reduces code readability. Signed-off-by: Linus Walleij <linus.walleij@stericsson.com> [grant.likely@secretlab.ca: removed dev_dbg->dev_err hunk] Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-22spi/bfin_spi: only request GPIO on first loadMichael Hennerich1-5/+8
The gpiolib code does not allow people to do gpio_request() on a GPIO once it has already been requested. So make sure we only request the pin on the first setup of a SPI device. Otherwise, if you attempts to reconfigure a SPI device on the fly (like change bit sizes), the setup function incorrectly fails. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-22spi/bfin_spi: handle error/status changes after data interruptsMichael Hennerich1-0/+9
The error interrupt on the BF537 SIC cannot be enabled on a per-peripheral basis. Once the error interrupt is enabled for one peripheral, it is automatically enabled for all. So in the Blackfin on-chip SPI driver, we need to clear out these known errors in the data interrupt once we've successfully finished processing all of the pending data. Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-21spi: enable spi_board_info to be registered after spi_masterFeng Tang1-41/+47
Currently spi_register_board_info() has to be called before its related spi_master be registered, otherwise these board info will be just ignored. This patch will remove this order limit, it adds a global spi master list like the existing global board info listr. Whenever a board info or a spi_master is registered, the spi master list or board info list will be scanned, and a new spi device will be created if there is a master-board info match. Signed-off-by: Feng Tang <feng.tang@intel.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-10-21spi: add spi_tegra driverErik Gilling3-0/+626
v2 changes: from Thierry Reding: * add "select TEGRA_SYSTEM_DMA" to Kconfig from Grant Likely: * add oneline description to header * inline references to DRIVER_NAME * inline references to BUSY_TIMEOUT * open coded bytes_per_word() * spi_readl/writel -> spi_tegra_readl/writel * move transfer validation to spi_tegra_transfer * don't request_mem_region iomem as platform bus does that for us * __exit -> __devexit v3 changes: from Russell King: * put request_mem_region back int from Grant Likely: * remove #undef DEBUG * add SLINK_ to register bit defines * remove unused bytes_per_word * make spi_tegra_readl/writel static linine * various refactoring for clarity * mark err if BSY bit is not cleared after 1000 retries * move spinlock to protect setting of RDY bit * subsys_initcall -> module_init v3 changes: from Grant Likely: * update spi_tegra to use PTR_ERRless dma API v4 changes: from Grant Likely: * remove empty spi_tegra_cleanup fucntion * allow device ids of -1 Signed-off-by: Erik Gilling <konkers@android.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Cc: Thierry Reding <thierry.reding@avionic-design.de> Cc: Russell King <linux@arm.linux.org.uk> spi: tegra: cleanups from upstream review Change-Id: Icecf7e64efcb39de072a15234ba1faa4bad40d25 Signed-off-by: Erik Gilling <konkers@android.com>
Copyright © 1996 – 2026 Jason A. Donenfeld. All Rights Reverse Engineered.