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2019-11-08fsi: aspeed: Fix OPB0 byte order register valuesAndrew Jeffery1-3/+3
The data byte order selection registers in the APB2OPB primarily expose some internal plumbing necessary to get correct write accesses onto the OPB. OPB write cycles require "data mirroring" across the 32-bit data bus to support variable data width slaves that don't implement "byte enables". For slaves that do implement byte enables the master can signal which bytes on the data bus the slave should consider valid. The data mirroring behaviour is specified by the following table: +-----------------+----------+-----------------------------------+ | | | 32-bit Data Bus | +---------+-------+----------+---------+---------+-------+-------+ | | | | | | | | | ABus | Mn_BE | Request | Dbus | Dbus | Dbus | Dbus | | (30:31) | (0:3) | Transfer | 0:7 | 8:15 | 16:23 | 24:31 | | | | Size | byte0 | byte1 | byte2 | byte3 | +---------+-------+----------+---------+---------+-------+-------+ | 00 | 1111 | fullword | byte0 | byte1 | byte2 | byte3 | +---------+-------+----------+---------+---------+-------+-------+ | 00 | 1110 | halfword | byte0 | byte1 | byte2 | | +---------+-------+----------+---------+---------+-------+-------+ | 01 | 0111 | byte | _byte1_ | byte1 | byte2 | byte3 | +---------+-------+----------+---------+---------+-------+-------+ | 00 | 1100 | halfword | byte0 | byte1 | | | +---------+-------+----------+---------+---------+-------+-------+ | 01 | 0110 | byte | _byte1_ | byte1 | byte2 | | +---------+-------+----------+---------+---------+-------+-------+ | 10 | 0011 | halfword | _byte2_ | _byte3_ | byte2 | byte3 | +---------+-------+----------+---------+---------+-------+-------+ | 00 | 1000 | byte | byte0 | | | | +---------+-------+----------+---------+---------+-------+-------+ | 01 | 0100 | byte | _byte1_ | byte1 | | | +---------+-------+----------+---------+---------+-------+-------+ | 10 | 0010 | byte | _byte2_ | | byte2 | | +---------+-------+----------+---------+---------+-------+-------+ | 11 | 0001 | byte | _byte3_ | _byte3_ | | byte3 | +---------+-------+----------+---------+---------+-------+-------+ Mirrored data values are highlighted by underscores in the Dbus columns. The values in the ABus and Request Transfer Size columns correspond to values in the field names listed in the write data order select register descriptions. Similar configuration registers are exposed for reads which enables the secondary purpose of configuring hardware endian conversions. It appears the data bus byte order is switched around in hardware so set the registers such that we can access the correct values for all widths. The values were determined by experimentation on hardware against fixed CFAM register values to configure the read data order, then in combination with the table above and the register layout documentation in the AST2600 datasheet performing write/read cycles to configure the write data order registers. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Joel Stanley <joel@jms.id.au> Acked-by: Alistair Popple <alistair@popple.id.au> Link: https://lore.kernel.org/r/20191108051945.7109-12-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-08fsi: aspeed: Add trace pointsJoel Stanley1-0/+22
These trace points help with debugging the FSI master. They show the low level reads, writes and error states of the master. Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20191108051945.7109-11-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-08fsi: Add ast2600 master driverJoel Stanley3-0/+531
The ast2600 BMC has a pair of FSI masters in it, behind an AHB to OPB bridge. The master driver supports reads and writes of full words, half word and byte accesses to remote CFAMs. It can perform very basic error recovery through resetting of the FSI port when an error is detected, and the issuing of breaks and terms. Signed-off-by: Joel Stanley <joel@jms.id.au> Acked-by: Alistair Popple <alistair@popple.id.au> -- v2: - remove debugging - squash in fixes Link: https://lore.kernel.org/r/20191108051945.7109-10-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-08fsi: Move defines to common headerJoel Stanley2-46/+71
The FSI master registers are common to the hub and AST2600 master (and the FSP2, if someone was to upstream a driver for that). Add defines to the fsi-master.h header, and introduce headings to delineate the existing low level details. Acked-by: Andrew Jeffery <andrew@aj.id.au> Acked-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20191108051945.7109-8-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-08fsi: fsi_master_class can be statickbuild test robot1-1/+1
There are no users outside of this file. Fixes: 0604d53d4da8 ("fsi: Add fsi-master class") Signed-off-by: kbuild test robot <lkp@intel.com> Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20191108051945.7109-7-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-08fsi: core: Fix small accesses and unaligned offsets via sysfsAndrew Jeffery1-4/+27
Subtracting the offset delta from four-byte alignment lead to wrapping of the requested length where `count` is less than `off`. Generalise the length handling to enable and optimise aligned access sizes for all offset and size combinations. The new formula produces the following results for given offset and count values: offset count | length --------------+------- 0 1 | 1 0 2 | 2 0 3 | 2 0 4 | 4 0 5 | 4 1 1 | 1 1 2 | 1 1 3 | 1 1 4 | 1 1 5 | 1 2 1 | 1 2 2 | 2 2 3 | 2 2 4 | 2 2 5 | 2 3 1 | 1 3 2 | 1 3 3 | 1 3 4 | 1 3 5 | 1 We might need something like this for the cfam chardevs as well, for example we don't currently implement any alignment restrictions / handling in the hardware master driver. Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20191108051945.7109-6-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-08fsi: Move master attributes to fsi-master classJeremy Kerr1-14/+9
Populate fsi_master_class->dev_attrs with the existing attribute definitions, so we don't need to explicitly register. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Acked-by: Alistair Popple <alistair@popple.id.au> Link: https://lore.kernel.org/r/20191108051945.7109-3-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-11-08fsi: Add fsi-master classJeremy Kerr1-0/+13
This change adds a device class for FSI masters, allowing access under /sys/class/fsi-master/, and easier udev rules. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Acked-by: Alistair Popple <alistair@popple.id.au> Link: https://lore.kernel.org/r/20191108051945.7109-2-joel@jms.id.au Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-08-28fsi: scom: Don't abort operations for minor errorsEddie James1-7/+1
The scom driver currently fails out of operations if certain system errors are flagged in the status register; system checkstop, special attention, or recoverable error. These errors won't impact the ability of the scom engine to perform operations, so the driver should continue under these conditions. Also, don't do a PIB reset for these conditions, since it won't help. Fixes: 6b293258cded ("fsi: scom: Major overhaul") Signed-off-by: Eddie James <eajames@linux.ibm.com> Cc: stable <stable@vger.kernel.org> Acked-by: Jeremy Kerr <jk@ozlabs.org> Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Link: https://lore.kernel.org/r/20190827041249.13381-1-jk@ozlabs.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-03fsi: sbefifo: Don't fail operations when in SBE IPL stateEddie James1-2/+2
SBE fifo operations should be allowed while the SBE is in any of the "IPL" states. Operations should succeed in this state. Fixes: 9f4a8a2d7f9d fsi/sbefifo: Add driver for the SBE FIFO Reviewed-by: Joel Stanley <joel@jms.id.au> Tested-by: Alistair Popple <alistair@popple.id.au> Signed-off-by: Eddie James <eajames@linux.ibm.com> Link: https://lore.kernel.org/r/1561575415-3282-1-git-send-email-eajames@linux.ibm.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-07-03Merge tag 'fsi-for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/joel/fsi into char-misc-nextGreg Kroah-Hartman2-15/+32
Joel writes: FSI changes for 5.3 - Add MAINTAINERS entry. There is now a git tree and a mailing list/patchwork for collecting FSI patches - Bug fix for error driver registration error paths - Correction for the OCC hwmon driver to meet the spec * tag 'fsi-for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/joel/fsi: fsi/core: Fix error paths on CFAM init OCC: FSI and hwmon: Add sequence numbering MAINTAINERS: Add FSI subsystem
2019-07-03fsi/core: Fix error paths on CFAM initJeremy Kerr1-12/+20
Change d1dcd67825 re-worked the struct fsi_slave initialisation in fsi_slave_init, but introduced a few inconsitencies: the slave->dev is now registered through cdev_device_add, but we may kfree() the device out from underneath the cdev registration. We may also leave an IDA allocated. This change fixes the error paths, so that we kfree() only before the device is registered with the core code. We also move the smode write to before we start creating proper devices, as it's the most likely to fail. We also remove the IDA-allocated minor on error, and properly clean up the of_node. Fixes: d1dcd6782576 ("fsi: Add cfam char devices") Reported-by: Lei YU <mine260309@gmail.com> Tested-by: John Wang <wangzqbj@inspur.com> Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Joel Stanley <joel@jms.id.au>
2019-07-03OCC: FSI and hwmon: Add sequence numberingEddie James1-3/+12
Sequence numbering of the commands submitted to the OCC is required by the OCC interface specification. Add sequence numbering and check for the correct sequence number on the response. Signed-off-by: Eddie James <eajames@linux.ibm.com> Acked-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Lei YU <mine260309@gmail.com> Signed-off-by: Joel Stanley <joel@jms.id.au>
2019-06-23Merge 5.2-rc6 into char-misc-nextGreg Kroah-Hartman1-9/+1
We need the char-misc fixes in here as well. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19fsi: cf-fsi-fw: Use the correct style for SPDX License IdentifierNishad Kamdar1-1/+1
This patch corrects the SPDX License Identifier style in header file related to Drivers for FRU Support Interface. For C header files Documentation/process/license-rules.rst mandates C-like comments (opposed to C source files where C++ style should be used) Changes made by using a script provided by Joe Perches here: https://lkml.org/lkml/2019/2/7/46 Suggested-by: Joe Perches <joe@perches.com> Signed-off-by: Nishad Kamdar <nishadkamdar@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 469Thomas Gleixner1-9/+1
Based on 1 normalized pattern(s): 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 mergchantability or fitness for a particular purpose see the gnu general public license for more details extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 2 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Enrico Weigelt <info@metux.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081202.997941624@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174Thomas Gleixner3-27/+3
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 655 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21treewide: Add SPDX license identifier - Makefile/KconfigThomas Gleixner2-0/+2
Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21treewide: Add SPDX license identifier for more missed filesThomas Gleixner1-0/+1
Add SPDX license identifiers to all files which: - Have no license information of any form - Have MODULE_LICENCE("GPL*") inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-12-02fsi: Add On-Chip Controller (OCC) driverEddie James3-0/+610
The OCC is a device embedded on a POWER processor that collects and aggregates sensor data from the processor and system. The OCC can provide the raw sensor data as well as perform thermal and power management on the system. This driver provides an atomic communications channel between a service processor (e.g. a BMC) and the OCC. The driver is dependent on the FSI SBEFIFO driver to get hardware access through the SBE to the OCC SRAM. Commands are issued to the SBE to send or fetch data to the SRAM. Signed-off-by: Eddie James <eajames@linux.ibm.com> Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2018-11-26fsi: fsi-scom.c: Remove duplicate headerBrajeswar Ghosh1-1/+0
Remove linux/cdev.h which is included more than once Signed-off-by: Brajeswar Ghosh <brajeswar.linux@gmail.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-11-26fsi: master-ast-cf: select GENERIC_ALLOCATORArnd Bergmann1-0/+1
In randconfig builds without CONFIG_GENERIC_ALLOCATOR, this driver fails to link: ERROR: "gen_pool_alloc_algo" [drivers/fsi/fsi-master-ast-cf.ko] undefined! ERROR: "gen_pool_fixed_alloc" [drivers/fsi/fsi-master-ast-cf.ko] undefined! ERROR: "of_gen_pool_get" [drivers/fsi/fsi-master-ast-cf.ko] undefined! ERROR: "gen_pool_free" [drivers/fsi/fsi-master-ast-cf.ko] undefined! Select the dependency as all other users do. Fixes: 6a794a27daca ("fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-10-24iov_iter: Separate type from direction and use accessor functionsDavid Howells1-2/+2
In the iov_iter struct, separate the iterator type from the iterator direction and use accessor functions to access them in most places. Convert a bunch of places to use switch-statements to access them rather then chains of bitwise-AND statements. This makes it easier to add further iterator types. Also, this can be more efficient as to implement a switch of small contiguous integers, the compiler can use ~50% fewer compare instructions than it has to use bitwise-and instructions. Further, cease passing the iterator type into the iterator setup function. The iterator function can set that itself. Only the direction is required. Signed-off-by: David Howells <dhowells@redhat.com>
2018-08-08fsi: sbefifo: Bump max command lengthBenjamin Herrenschmidt1-7/+32
Otherwise cronus putmem fails istep and BML fails to upload skiboot To do that, we still use our one-page command buffer for small commands for speed, and for anything bigger, with a limit of 1MB plus a page, we vmalloc a temporary buffer. The limit was chosen because Cronus will break up any data transfer into 1M chunks (the extra page is for the command header). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
2018-08-06fsi: scom: Fix NULL dereferenceBenjamin Herrenschmidt1-0/+1
The chardev conversion forgot to copy the fsi_dev, silly mistake, compounded by a testing mistake on my side, this specific driver wasn't being tested properly. Fixes: d8f4587655f9 "fsi: scom: Convert to use the new chardev" Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-27fsi: Prevent multiple concurrent rescansBenjamin Herrenschmidt2-2/+16
The bus scanning process isn't terribly good at parallel attempts at rescanning the same bus. Let's have a per-master mutex protecting the scanning process. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-27fsi: Add cfam char devicesBenjamin Herrenschmidt1-51/+213
This aims to deprecate the "raw" sysfs file used for directly accessing the CFAM and instead use a char device like the other sub drivers. Since it reworks the slave creation code and adds a cfam device type, we also use the opportunity to convert the attributes to attribute groups and add a couple more. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-27fsi: scom: Convert to use the new chardevBenjamin Herrenschmidt1-50/+80
This converts FSI scom to use the new fsi-core controlled chardev allocator and use a real cdev instead of a miscdev. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-27fsi: sbefifo: Convert to use the new chardevBenjamin Herrenschmidt1-29/+55
This converts FSI sbefifo to use the new fsi-core controlled chardev allocator and use a real cdev instead of a miscdev. One side effect is to fix the object lifetime by removing the use of devm_kzalloc() for something that contains kobjects, and using proper reference counting. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-27fsi: Add new central chardev supportBenjamin Herrenschmidt2-2/+108
The various FSI devices (sbefifo, occ, scom, more to come) currently use misc devices. This is problematic as the minor device space for misc is limited and there can be a lot of them. Also it limits our ability to move them to a dedicated /dev/fsi directory or to be smart about device naming and numbering. It also means we have IDAs on every single of these drivers This creates a common fsi "device_type" for the optional /dev/fsi grouping and a dev_t allocator for all FSI devices. "Legacy" devices get to use a backward compatible numbering scheme (as long as chip id <16 and there's only one copy of a given unit type per chip). A single major number and a single IDA are shared for all FSI devices. This doesn't convert the FSI device drivers to use the new scheme yet, they will be converted individually. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-26fsi: master-ast-cf: Rename dump_trace() to avoid name collisionBenjamin Herrenschmidt1-5/+5
s390 defines a global dump_trace() symbol. Rename ours to dump_ucode_trace() to avoid a collision in build tests. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-26fsi: master-ast-cf: Fix memory leakGustavo A. R. Silva1-2/+4
In case memory resources for *fw* were allocated, release them before return. Addresses-Coverity-ID: 1472044 ("Resource leak") Fixes: 6a794a27daca ("fsi: master-ast-cf: Add new FSI master using Aspeed ColdFire") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-25fsi: master-ast-cf: Mask unused bits in RTAG/RCRCBenjamin Herrenschmidt1-2/+2
Then reading the RTAG/RCRC "registers" from the coprocessor after a command is complete, mask out the top bits, only keep the relevant bits. Microcode v5 will leave garbage in those top bits as a result of a performance optimization. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> ---
2018-07-24fsi: master-ast-cf: Fix build warnings on 64-bit platformsBenjamin Herrenschmidt1-2/+2
A couple of places forgot the 'z' qualifier for dev_dbg when printing a size_t Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-23fsi: Add support for device-tree provided chip IDsBenjamin Herrenschmidt1-0/+24
They get retrieved from the device-tree and exposed as an attribute in sysfs Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-23fsi: sbefifo: Fix inconsistent use of ffdc mutexBenjamin Herrenschmidt1-4/+9
Some of the exit path missed the unlock. Move the mutex to an outer function to avoid the problem completely Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-23fsi: master-ast-cf: Add new FSI master using Aspeed ColdFireBenjamin Herrenschmidt4-0/+1605
The Aspeed AST2x00 can contain a ColdFire v1 coprocessor which is currently unused on OpenPower systems. This adds an alternative to the fsi-master-gpio driver that uses that coprocessor instead of bit banging from the ARM core itself. The end result is about 4 times faster. The firmware for the coprocessor and its source code can be found at https://github.com/ozbenh/cf-fsi and is system specific. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-12fsi: Move various master definitions to a common headerBenjamin Herrenschmidt2-29/+33
This moves the definitions for various protocol details (message & response codes, delays etc...) out of fsi-master-gpio.c to fsi-master.h in order to share them with other master implementations. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: master-gpio: Add missing release functionBenjamin Herrenschmidt1-18/+35
The embedded struct device needs a release function to be able to successfully remove the driver. We remove the devm_gpiod_put() as they are unnecessary (the resources will be released automatically) and because fsi_master_unregister() will cause the master structure to be freed. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: Don't use device_unregister() in fsi_master_register()Benjamin Herrenschmidt1-5/+2
In the error path of fsi_master_register(), we currently use device_unregister(). This will cause the last reference to the structure to be dropped, thus freeing the enclosing structure, which isn't what the callers want. Use device_del() instead so that we return to the caller with a refcount of 1. The caller can then assume that it must use put_device() after a call to fsi_master_register() regardless of whether the latter suceeded or failed. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-12fsi: master-gpio: Remove "GPIO" prefix on some definitionsBenjamin Herrenschmidt1-34/+36
Some definitions are generic to the FSI protocol or any give master implementation. Rename them to remove the "GPIO" prefix in preparation for moving them to a common header. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au> # Conflicts: # drivers/fsi/fsi-master-gpio.c
2018-07-12fsi: master-gpio: Remove unused definitionsBenjamin Herrenschmidt1-6/+0
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: master-gpio: Add more tracepointsBenjamin Herrenschmidt1-6/+10
This adds a few more tracepoints that have proven useful when debugging issues with the FSI bus. This also makes echo_delay() use clock_zeros() instead of open-code it in order to share the tracepoint. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: master-gpio: Add support for link_configBenjamin Herrenschmidt1-2/+25
To configure the send and echo delays Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: master-gpio: Rename and adjust send delayBenjamin Herrenschmidt1-3/+6
What the driver called "FSI_GPIO_PRIME_SLAVE_CLOCKS" is what the FSI spec calls tSendDelay and should be 16 clocks by default. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: Add mechanism to set the tSendDelay and tEchoDelay valuesBenjamin Herrenschmidt2-18/+93
Those values control the amount of "dummy" clocks between commands and between a command and its response. This adds a way to configure them from sysfs (to be later extended to defaults in the device-tree). The default remains 16 (the HW default). This is only supported if the backend supports the new link_config() callback to configure the generation of those delays. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au> ---
2018-07-12fsi: Move code around to avoid forward declarationBenjamin Herrenschmidt1-48/+46
Move fsi_slave_set_smode() and its helpers to before it's first user and remove the corresponding forward declaration. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: Joel Stanley <joel@jms.id.au>
2018-07-12fsi: sbefifo: Fix checker warning about late NULL checkBenjamin Herrenschmidt1-2/+5
"dev" is dereferences before it's checked. Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-12fsi/sbefifo: Add dependency on OF_ADDRESSGuenter Roeck1-0/+1
The driver calls of_platform_device_create() which is only available if OF_ADDRESS is enabled. When building sparc64 images, this results in ERROR: "of_platform_device_create" [drivers/fsi/fsi-sbefifo.ko] undefined! Fixes: 9f4a8a2d7f9d ("fsi/sbefifo: Add driver for the SBE FIFO") Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2018-07-12fsi: sbefifo: Add missing mutex_unlockEddie James1-0/+1
There was no unlock of the FFDC mutex. Fixes: 9f4a8a2d7f9d ("fsi/sbefifo: Add driver for the SBE FIFO") Signed-off-by: Eddie James <eajames@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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