When a controller has only PIO support it is very likely that we will
run into use cases where we spend a very large amount of time consuming
CPU.  Code that does this should call cond_resched() every once in a
while to give other tasks more of a chance to run so do that in the main
SPI loop, the overhead is negligable if it's not needed.
Suggested-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NMark Brown <broonie@kernel.org>

In addition to providing direct access to SPI bus, some spi controller
hardwares (like ti-qspi) provide special port (like memory mapped port)
that are optimized to improve SPI flash read performance.
This means the controller can automatically send the SPI signals
required to read data from the SPI flash device.
For this, SPI controller needs to know flash specific information like
read command to use, dummy bytes and address width.

Introduce spi_flash_read() interface to support accelerated read
over SPI flash devices. SPI master drivers can implement this callback to
support interfaces such as memory mapped read etc. m25p80 flash driver
and other flash drivers can call this make use of such interfaces. The
interface should only be used with SPI flashes and cannot be used with
other SPI devices.
Signed-off-by: NVignesh R <vigneshr@ti.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

There should be an 's' on "dump_message" so it matches the module_param.

Fixes: 84e0c4e5 ('spi: add loopback test driver to allow for spi_master regression tests')
Signed-off-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

The SPI core calls set_cs before a transfer, but the SUN4I_CTL_CS_MANUAL
flag is only set in transfer_one. This leads to the following pattern on
the chip-select line (with runtime power-management on every transfer,
without it only on the first one):

activate, deactivate, activate, transfer, deactivate

Moving the configuration of the SUN4I_CTL_CS_MANUAL flag from transfer_one
to set_cs removes the double activation.
Signed-off-by: NMarcus Weseloh <mweseloh42@gmail.com>
Acked-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

The spi_check_rx_ranges can always get executed independent of
if we have a real loopback situation.
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

Rename method spi_test_fill_tx to spi_test_fill_pattern
to better describe what it does.
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

Currently the rx_buf does not get set with the
SPI_TEST_PATTERN_UNWRITTEN when tx_buf == NULL in the transfer.

Reorder code so that it gets done also under this specific condition.
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

The fsl-espi hardware can trasfer at most 64K data so report teh
limitation.

Based on patch by Heiner Kallweit <hkallweit1@gmail.com>

CC: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: NMichal Suchanek <hramrach@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

Use to_platform_device() instead of open-coding it.
Signed-off-by: NGeliang Tang <geliangtang@163.com>
Reviewed-by: NMoritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

Use to_platform_device() instead of open-coding it.
Signed-off-by: NGeliang Tang <geliangtang@163.com>
Reviewed-by: NMoritz Fischer <moritz.fischer@ettus.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

spi->irq was ignoring GpioInt property setting it to -1.
acpi_dev_gpio_irq_get returns and configure the slave IRQ according to
the ACPI slave node description.

It is now inline with devicetree behavior.
Acked-by: NMark Brown <broonie@kernel.org>
Signed-off-by: NChristophe Ricard <christophe-h.ricard@st.com>
Acked-by: NMika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: NRafael J. Wysocki <rafael.j.wysocki@intel.com>

This patch adds spi support for mt2701 IC.
Signed-off-by: NLeilk Liu <leilk.liu@mediatek.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

This patch merge all identical compat into on mtk_common_compat
and used for all compatible soc.
Signed-off-by: NLeilk Liu <leilk.liu@mediatek.com>
Reviewed-by: NMatthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

In the case where transfer length is not a multiple of 4, KASAN
reports 2 out-of-bounds memory accesses:
 - mtk_spi_interrupt: ioread32_rep writes past the end of
   trans->rx_buf.
 - mtk_spi_fifo_transfer: iowrite32_rep reads past the end of
   xfer->tx_buf.

Fix this by using memcpy on the remainder of the bytes.
Signed-off-by: NNicolas Boichat <drinkcat@chromium.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

s5pv210 and exynos4 are now DT only platforms hence these
entries can now be safely removed from the match table.
Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

Use to_spi_device() instead of open-coding it.
Signed-off-by: NGeliang Tang <geliangtang@163.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

The TMODE available value is well defined and documented in the header
file. Use it and remove the comment.
Signed-off-by: NJisheng Zhang <jszhang@marvell.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

ls1 has qe and ls1 has arm cpu.
move qe from arch/powerpc to drivers/soc/fsl
to adapt to powerpc and arm
Signed-off-by: NZhao Qiang <qiang.zhao@freescale.com>
Signed-off-by: NScott Wood <scottwood@freescale.com>

Fix parent-device reference leak due to SPI-core taking an unnecessary
reference to the parent when allocating the master structure, a
reference that was never released.

Note that driver core takes its own reference to the parent when the
master device is registered.

Fixes: 49dce689 ("spi doesn't need class_device")
Signed-off-by: NJohan Hovold <johan@kernel.org>
Signed-off-by: NMark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org

We use the spi_lock spinlock to protect against races between the device
being removed and file operations on the spidev.  This means that in the
removal path all references to the device need to be done under lock as
in removal we dropping references to the device.
Reported-by: NVegard Nossum <vegard.nossum@oracle.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

If SPI device supports DMA mode, but DMA controller is not yet
available due to e.g. a delay in the corresponding kernel module
initialization, retry to initialize SPI driver later on instead of
falling back into PIO only mode.
Signed-off-by: NAnton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

On SDMA initialization return exactly the same error, which is
reported by dma_request_slave_channel_reason(), it is a preceding
change to defer SPI DMA initialization, if SDMA module is not yet
available.
Signed-off-by: NVladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Signed-off-by: NAnton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

Limit SPI_LOOP mode to ECSPI controller (iMX.51, iMX53 and i.MX6) only since
there is no support in other families specific code for now.
Signed-off-by: NAnton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

If controller hold in reset it's not possible to write any
register except CTRL. So all other registers must be updated
only after controller bring out from reset.
Signed-off-by: NAnton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

Added additional transfer length to test that are not a power of 2.
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

The test "two tx+rx transfers - alter second" actually modifies
the first not the second transfer, which - in conjunction with
testing the read data - results also in overwriting data read
earlier.
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

Fixes the reported printk format issues reported by kbuild-test-robot.
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

adding the spi-loopback-test module to Kconfig and Makefile
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

This driver is submitting lots of distinct spi-messages messages
with all kinds of alignments and length pattern.
Also distinct kinds of transfer pattern tests are implemented
(rx, tx, rx/tx, tx+tx, tx+rx,...)

Right now on a raspberry pi 752 distinct spi_messages are executed
in 13 different scenarios.

Configuration of additional test-pattern is easy, so that when
new bugs in drivers get detected the relevant transfer pattern can
also get added to the test framework, so that such situations are
detected in other drivers as well.

The idea behind this driver is to make it possible to also detect
regressions in spi_master implementations when changes occur.
Potentially these tests could get executed automatically in a
test-server-farm.
Signed-off-by: NMartin Sperl <kernel@martin.sperl.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

Use dev_err() for reporting errors rather than
dev_dbg().
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

davinci_spi_bufs() uses wait_for_completion_interruptible()
without bothering to handle -ERESTARTSYS. Due to this,
sometime, it returns prematurely when a signal is received.
Since the return value is never checked, userspace eventually
receives a spurious -EIO.

To fix this, use un-interruptible wait_for_completion_timeout().
Signed-off-by: NSekhar Nori <nsekhar@ti.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

DSPI instances in Vybrid have a different amount of chip selects
and CTARs (Clock and transfer Attributes Register). In case of
DSPI1 we only have 2 CTAR registers and 4 CS. In present driver
implementation CTAR offset is derived from CS instance which will
lead to out of bound access if chip select instance is greater than
CTAR register instance, hence use single CTAR0 register for all CS
instances. Since we write the CTAR register anyway before each access,
there is no value in using the additional CTAR registers. Also one
should not program a value in CTAS for a CTAR register that is not
present, hence configure CTAS to use CTAR0.
Signed-off-by: NBhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Acked-by: NStefan Agner <stefan@agner.ch>
Signed-off-by: NMark Brown <broonie@kernel.org>

Using pr_* macros are more prefferable than using printk. Start using
pr_* family of macros and define pr_fmt to be used with it.
While at it remove DRVNAME from an existing pr_info() as the name is now
being printed by pr_fmt.
Signed-off-by: NSudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

As we have a struct device available it is better to use dev_warn()
instead of printk.
Signed-off-by: NSudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

Similar to other controller type checks add check function for
IMX51. It includes IMX53 and IMX6.
Signed-off-by: NAnton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

There is no need to have different watermarks levels since they are the same.
Merge them into one WML parameter.
Signed-off-by: NAnton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

The overflow may happen due to rescheduling for another task and/or interrupt
if we enable SPI HW before starting RX DMA. So RX DMA enabled first to make
sure data would be read out from FIFO ASAP. TX DMA enabled next to start
filling TX FIFO with new data. And finaly SPI HW enabled to start actual
data transfer.

The risk rise in case of heavy system load and high SPI clock.
Signed-off-by: NAnton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

Not only TX DMA should be terminated, but RX DMA also. It's required
to avoid accidential DMA memory writes from RX DMA channel and properly
terminate transaction.
Signed-off-by: NAnton Bondarenko <anton.bondarenko.sama@gmail.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

Modify spi-lm70llp driver to use the new parallel port device model.
Signed-off-by: NSudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: NMark Brown <broonie@kernel.org>

checkpatch complains about space before closing brace.
Signed-off-by: NSudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: NMark Brown <broonie@kernel.org>