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path: root/drivers/spi
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2016-10-11kthread: kthread worker API cleanupPetr Mladek
A good practice is to prefix the names of functions by the name of the subsystem. The kthread worker API is a mix of classic kthreads and workqueues. Each worker has a dedicated kthread. It runs a generic function that process queued works. It is implemented as part of the kthread subsystem. This patch renames the existing kthread worker API to use the corresponding name from the workqueues API prefixed by kthread_: __init_kthread_worker() -> __kthread_init_worker() init_kthread_worker() -> kthread_init_worker() init_kthread_work() -> kthread_init_work() insert_kthread_work() -> kthread_insert_work() queue_kthread_work() -> kthread_queue_work() flush_kthread_work() -> kthread_flush_work() flush_kthread_worker() -> kthread_flush_worker() Note that the names of DEFINE_KTHREAD_WORK*() macros stay as they are. It is common that the "DEFINE_" prefix has precedence over the subsystem names. Note that INIT() macros and init() functions use different naming scheme. There is no good solution. There are several reasons for this solution: + "init" in the function names stands for the verb "initialize" aka "initialize worker". While "INIT" in the macro names stands for the noun "INITIALIZER" aka "worker initializer". + INIT() macros are used only in DEFINE() macros + init() functions are used close to the other kthread() functions. It looks much better if all the functions use the same scheme. + There will be also kthread_destroy_worker() that will be used close to kthread_cancel_work(). It is related to the init() function. Again it looks better if all functions use the same naming scheme. + there are several precedents for such init() function names, e.g. amd_iommu_init_device(), free_area_init_node(), jump_label_init_type(), regmap_init_mmio_clk(), + It is not an argument but it was inconsistent even before. [arnd@arndb.de: fix linux-next merge conflict] Link: http://lkml.kernel.org/r/20160908135724.1311726-1-arnd@arndb.de Link: http://lkml.kernel.org/r/1470754545-17632-3-git-send-email-pmladek@suse.com Suggested-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Petr Mladek <pmladek@suse.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Tejun Heo <tj@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: Josh Triplett <josh@joshtriplett.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Borislav Petkov <bp@suse.de> Cc: Michal Hocko <mhocko@suse.cz> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-09-30Merge remote-tracking branches 'spi/topic/ti-qspi', 'spi/topic/tools', ↵Mark Brown
'spi/topic/txx9' and 'spi/topic/xlp' into spi-next
2016-09-30Merge remote-tracking branches 'spi/topic/rspi', 'spi/topic/sc18is602', ↵Mark Brown
'spi/topic/sh-msiof', 'spi/topic/spidev-test' and 'spi/topic/st-ssc4' into spi-next
2016-09-30Merge remote-tracking branches 'spi/topic/octeon', 'spi/topic/pic32-sqi', ↵Mark Brown
'spi/topic/pxa2xx' and 'spi/topic/qup' into spi-next
2016-09-30Merge remote-tracking branches 'spi/topic/fsl-espi', 'spi/topic/imx', ↵Mark Brown
'spi/topic/jcore', 'spi/topic/loopback' and 'spi/topic/meson' into spi-next
2016-09-30Merge remote-tracking branches 'spi/topic/bcm', 'spi/topic/dw' and ↵Mark Brown
'spi/topic/fsl-dspi' into spi-next
2016-09-30Merge remote-tracking branch 'spi/topic/dma' into spi-nextMark Brown
2016-09-29spi: sc18is602: Change gpiod_set_value to gpiod_set_value_cansleepPhil Reid
To avoid warning when using i2c gpio expander change call to the cansleep variant. There should be no issue with sleeping in the drivers probe function. Signed-off-by: Phil Reid <preid@electromag.com.au> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-29spi: pxa2xx: Fix build error because of missing headerMika Westerberg
Kbuild test robot reports: drivers/spi/spi-pxa2xx.c: In function ‘setup_cs’: drivers/spi/spi-pxa2xx.c:1190:20: error: implicit declaration of function ‘desc_to_gpio’ ... Reason for this is the fact that those functions are declared in linux/gpio/consumer.h which is not included in the driver. Fix this by including it. Reported-by: kbuild test robot <fengguang.wu@intel.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-28spi: imx: fix error return code in spi_imx_probe()Wei Yongjun
Fix to return error code -EINVAL if no CS GPIOs available instead of 0, as done elsewhere in this function. Fixes: f13d4e189d20 ("spi: imx: Gracefully handle NULL master->cs_gpios") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Acked-by: Marek Vasut <marex@denx.de> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-26spi: pxa2xx: Add support for GPIO descriptor chip selectsMika Westerberg
The driver uses custom chip_info coming from platform data for chip selects implemented as GPIOs. If the system lacks board files setting up the platform data, it is not possible to use GPIOs as chip selects. This adds support for GPIO descriptors so that regardless of the underlying firmware interface (DT, ACPI or platform data) the driver can request GPIOs used as chip selects and configure them accordingly. The custom chip_info GPIO support is still left there to make sure the existing systems keep working as expected. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-26spi: imx: Gracefully handle NULL master->cs_gpiosMarek Vasut
It is possible that master->cs_gpios is NULL after spi_bitbang_start(), this happens if the master has no CS GPIOs specified in DT. Check for this case after spi_bitbang_start() to prevent NULL pointer dereference in the subsequent for loop, which accesses the master->cs_gpios field. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Martin Kaiser <martin@kaiser.cx> Cc: Mark Brown <broonie@kernel.org> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-24spi: iproc-qspi: Add Broadcom iProc SoCs supportKamal Dasu
This spi driver uses the common spi-bcm-qspi driver and implements iProc SoCs specific interrupt controller. The common driver now calls the SoC handlers when present. Adding support for both muxed l1 and unmuxed interrupt sources. Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-24spi: fsl-espi: improve return value handling in fsl_espi_probeHeiner Kallweit
The return value of fsl_espi_probe (currently struct spi_master *) is just used for checking whether an error occurred. Change the return value type to int and simplify the code. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-24spi: fsl-espi: simplify of_fsl_espi_probeHeiner Kallweit
Simplify of_fsl_espi_probe. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-24spi: fsl-espi: remove unused variable in fsl_espi_setupHeiner Kallweit
Remove an unused variable. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-16spi: bcm-qspi: Fix error return code in bcm_qspi_probe()Wei Yongjun
Fix to return a negative error code from the error handling case instead of 0, as done elsewhere in this function. Fixes: fa236a7ef240 ("spi: bcm-qspi: Add Broadcom MSPI driver") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-16spi: bcm-qspi: Fix return value check in bcm_qspi_probe()Wei Yongjun
In case of error, the function kcalloc() returns NULL pointer not ERR_PTR(). The IS_ERR() test in the return value check should be replaced with NULL test. Fixes: fa236a7ef240 ("spi: bcm-qspi: Add Broadcom MSPI driver") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-16spi: bcm-qspi: fix suspend/resume #ifdefArnd Bergmann
The two power management functions are define inside of an #ifdef but referenced unconditionally, which is obviously broken when CONFIG_PM_SLEEP is not set: drivers/spi/spi-bcm-qspi.c:1300:13: error: 'bcm_qspi_suspend' undeclared here (not in a function) drivers/spi/spi-bcm-qspi.c:1301:13: error: 'bcm_qspi_resume' undeclared here (not in a function) This replaces the #ifdef with a __maybe_unused annotation that lets the compiler figure out whether to drop the functions itself, and uses SIMPLE_DEV_PM_OPS() to refer to the functions. This will also fill the freeze/thaw/poweroff/restore callback pointers in addition to suspend/resume, but as far as I can tell, this is what we want. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: fa236a7ef240 ("spi: bcm-qspi: Add Broadcom MSPI driver") Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-16spi: bcm-qspi: don't include linux/mtd/cfi.hArnd Bergmann
The header isn't actually needed here, but including it leads to a build warning when CONFIG_MTD is disabled: include/linux/mtd/cfi.h:76:2: #warning No CONFIG_MTD_CFI_Ix selected. No NOR chip support can work. [-Werror=cpp] Fixes: fa236a7ef240 (spi: bcm-qspi: Add Broadcom MSPI driver) Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: fsl-espi: improve and extend register bit definitionsHeiner Kallweit
Add definition of further register bits for use in upcoming driver extensions and improve current bit definitions: - use BIT macro - use bit names as in the chip spec Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: fsl-espi: align register access with other driversHeiner Kallweit
Change register access to the method used in other drivers too. - use register names as in the chip spec for constants - avoid hard to read statements like __be32 __iomem *espi_mode = &reg_base->mode - get rid of old powerpc-specific functions like in_8 In addition annotate reg_base in struct mpc8xxx_spi as __iomem. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: fsl-espi: improve and simplify interrupt handlerHeiner Kallweit
Simplify the interrupt handler a little. In addition don't call fsl_espi_cpu_irq() if no event bit is set. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: fsl-espi: simplify fsl_espi_setup_transferHeiner Kallweit
If t is not null then the SPI core takes care that bits_per_word and speed_hz are populated. This allows to simplify fsl_espi_setup_transfer. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: imx: support loopback mode on imx35Martin Kaiser
imx35 and compatible chipsets support loopback mode by setting a loopback control bit in the test register. Make this setting available for data transfers, similar to what we do for imx51. Signed-off-by: Martin Kaiser <martin@kaiser.cx> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: imx: set spi_bus_clk for mx1, mx31 and mx35Martin Kaiser
Modify spi_imx_clkdiv_2() to return the resulting bus clock frequency when the selected clock divider is applied. Set spi_imx->spi_bus_clk to this frequency. If spi_bus_clk is unset, spi_imx_calculate_timeout() causes a division by 0. Signed-off-by: Martin Kaiser <martin@kaiser.cx> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: bcm-qspi: Add BSPI spi-nor flash controller driverKamal Dasu
This change implements BSPI driver for Broadcom BRCMSTB, NS2, NSP SoCs works in combination with the MSPI controller driver and implements flash read acceleration and implements the spi_flash_read() method. Both MSPI and BSPI controllers are needed to access spi-nor flash. Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: brcmstb-qspi: Broadcom settop platform driverKamal Dasu
Adding the settop SoC platfrom driver, this driver is compatible with the settop MSPI+BSPI and MSPI only blocks implemented on the SoCs. Driver calls the spi-bcm-qspi probe(), remove() and pm_ops. Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: bcm-qspi: Add Broadcom MSPI driverKamal Dasu
Master SPI driver for Broadcom settop, iProc SoCs. The driver is used for devices that use SPI protocol on BRCMSTB, NSP, NS2 SoCs. SoC platform driver call exported porbe(), remove() and suspend/resume pm_ops implemented in this common driver. Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> Signed-off-by: Yendapally Reddy Dhananjaya Reddy Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-14spi: st-ssc4: Fix misuse of devm_gpio_request/devm_gpio_free APIsAxel Lin
devm_* API is supposed to be used only in probe function call. The resource is allocated at 'probe' and free automatically at 'remove'. Usage of devm_* functions outside probe sometimes leads to resource leak. Thus avoid using devm_* APIs in .setup/.cleanup callbacks. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: meson: Add GXBB compatibleNeil Armstrong
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com> Acked-by: Kevin Hilman <khilman@baylibre.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: merge fsl_espi_trans and fsl_espi_do_transHeiner Kallweit
Merge both functions to reduce source code size and improve readability. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: improve message length handlingHeiner Kallweit
Move checking for a zero-length message up in the call chain and use m->frame_length instead of re-calculating the overall length of all transfers in the message. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: factor out handling of read dataHeiner Kallweit
Factor out copying read data to the read buffers in the original message to a new function fsl_espi_copy_from_buf. This also allows to simplify fsl_espi_copy_to_buf. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: centralize populating struct spi_transferHeiner Kallweit
Better structure the code by population all elements of struct spi_transfer in one place. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: factor out initial message checkingHeiner Kallweit
Checking the message is currently done at diffrent places in the driver. Factor it out to fsl_espi_check_message. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: pxa2xx: Default thresholds to PXA configurationAndy Shevchenko
Most of the devices in the supported list have PXA configuration of FIFO. In particularly Intel Medfield and Merrifield have bigger FIFO, than it's defined for CE4100. Split CE4100 in the similar way how it was done for Intel Quark, i.e. prefix definitions by CE4100 and append necessary pieces of code to switch case conditions. We are on safe side since those bits are ignored on all LPSS IPs. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: pxa2xx: Remove pointer to chip data from driver dataJarkko Nikula
Transfer state machine in this driver does not need to set/unset pointer to chip data between queueing and finalizing message as it is not actually used as a state info itself but just pointer passing. Since this per SPI device specific chip data is already carried in ctldata use that and remove pointer to chip data from driver data. While at it, group initialized variables before uninitialized variables in pump_transfers(). Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: pxa2xx: Remove pointer to current SPI message from driver dataJarkko Nikula
There is no need to carry pointer to current SPI message in driver data because cur_msg in struct spi_master holds it already when driver is using the message queueing infrastructure from the SPI core. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: pxa2xx: Do not needlessly initialize stack variablesJarkko Nikula
All of these variables are unconditionally set before their use. Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: dw: round up result of calculation for clock dividerMatthias Seidel
Avoid ending up with a higher frequency than requested Signed-off-by: Matthias Seidel <kernel@mseidel.net> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: merge fsl_espi_bufs and fsl_espi_cpu_bufsHeiner Kallweit
fsl_espi_bufs and fsl_espi_cpu_bufs are very small that we can merge them. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: improve return value handling in fsl_espi_bufsHeiner Kallweit
Return a proper status code from fsl_espi_bufs instead of returning the number of remaining words and let the caller evaluate it. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: merge fsl_espi_cmd_trans and fsl_espi_rw_transHeiner Kallweit
fsl_espi_cmd_trans and fsl_espi_rw_trans share most of the code so we can merge them. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: eliminate struct fsl_espi_transferHeiner Kallweit
The remaining elements of struct fsl_espi_transfer are part of struct spi_transfer anyway. So we can get rid of struct fsl_espi_transfer and use a struct spi_transfer only. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: remove element actual_length from struct fsl_espi_transHeiner Kallweit
If an error occurs during processing the message, then we don't have to populate the actual_length element of struct message. So we can get rid of element actual_length in struct fsl_espi_transfer. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: fix status handling in fsl_espi_do_one_msgHeiner Kallweit
If an error occurred during message handling return this error instead of always returning 0 and align the code with the generic implementation in spi_transfer_one_message. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: remove element status from struct fsl_espi_transferHeiner Kallweit
Use the return values of the functions in the call chain to transport status information instead of using an element in struct fsl_espi_transfer for this. This is more in line with the general approach how to handle status information and is one step further to eventually get rid of struct fsl_espi_transfer completely. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: factor out filling the local bufferHeiner Kallweit
Better structure the code by factoring out filling the local buffer. In addition don't initialize the complete local buffer at the beginning of fsl_espi_do_one_msg. Instead move initialization of those parts of the local buffer to be used for transfers w/o tx_buf to fsl_espi_copy_to_buf. Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
2016-09-12spi: fsl-espi: pre-allocate message bufferHeiner Kallweit
Currently the driver allocates a 64kb buffer for each single message. On systems with little and fragmented memory this can result in memory allocation errors. Solve this by pre-allocating a buffer. This patch was developed in OpenWRT long ago, however it never made it upstream. I slightly modified the original patch to re-initialize the buffer at the beginning of each transfer. Signed-off-by: Gabor Juhos <juhosg@openwrt.org> Signed-off-by: Felix Fietkau <nbd@nbd.name> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com> Signed-off-by: Mark Brown <broonie@kernel.org>
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