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author | Mark Brown <broonie@kernel.org> | 2021-09-27 18:32:13 +0100 |
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committer | Mark Brown <broonie@kernel.org> | 2021-09-27 18:32:13 +0100 |
commit | 728cb436d4bee8d4f7ad64f014915a4fb6e58c5b (patch) | |
tree | 49026c03c45e2462ce4bf310278bad1f450ee471 /drivers/spi/Kconfig | |
parent | eca17cbabd0cd52d32949b5ae27a4b3344e87781 (diff) | |
parent | a16cc807762730a6291762d4bedd7b00624a6426 (diff) | |
download | linux-stable-728cb436d4bee8d4f7ad64f014915a4fb6e58c5b.tar.gz linux-stable-728cb436d4bee8d4f7ad64f014915a4fb6e58c5b.tar.bz2 linux-stable-728cb436d4bee8d4f7ad64f014915a4fb6e58c5b.zip |
Merge series "add support for Cadence's XSPI controller" from Parshuram Thombare <pthombar@cadence.com>:
This patch series adds support for Cadence's XSPI controller.
It supports 3 work modes.
1. ACMD (auto command) work mode
ACMD name is because it uses auto command engine in the controller.
It further has 2 modes PIO and CDMA (command DMA).
The CDMA work mode is dedicated for high-performance application
where very low software overhead is required. In this mode the
Command Engine is programmed by the series of linked descriptors
stored in system memory. These descriptors provide commands to execute
and store status information for finished commands.
The PIO mode work mode is dedicated for single operation where
constructing a linked list of descriptors would require too
much effort.
2. STIG (Software Triggered Instruction Generator) work mode
In STIG mode, controller sends low-level instructions to memory.
Each instruction is 128-bit width. There is special instruction
DataSequence which carries information about data phase.
Driver uses Slave DMA interface to transfer data as only this
interface can be used in STIG work mode.
3. Direct work mode
This work mode allows sending data without invoking any command through
the slave interface.
Currently only STIG work mode is enabled, remaining work modes will
be added later.
Changes since v5:
1. Added adjust_op_size to adjust op size according to sdma size.
Changes since v4:
1. Changed reg region names and lengths as suggested by Rob.
Changes since v3:
1. Removed ACMD PIO mode.
2. Return IRQ_HANDLED only for handled interrupts.
3. DT binding changes.
Changes since v2:
1. Removed extra lock around exec_op.
2. Removed PHY parameters setting from the driver, those will be
handled by bootstrap pins available in the controller.
Changes since v1:
1. Use ACMD PIO work mode for NOR read, program and erase operations,
for everything else use STIG(Software Triggered Instruction
Generator) work mode.
2. Changes suggested by Lukas.
Parshuram Thombare (2):
spi: cadence: add dt-bindings documentation for Cadence XSPI
controller
spi: cadence: add support for Cadence XSPI controller
.../devicetree/bindings/spi/cdns,xspi.yaml | 77 +++
drivers/spi/Kconfig | 12 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-cadence-xspi.c | 640 +++++++++++++++++++++
4 files changed, 730 insertions(+)
create mode 100644 Documentation/devicetree/bindings/spi/cdns,xspi.yaml
create mode 100644 drivers/spi/spi-cadence-xspi.c
--
2.7.4
Diffstat (limited to 'drivers/spi/Kconfig')
-rw-r--r-- | drivers/spi/Kconfig | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index c1c8e15c01a2..596705d24400 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -228,6 +228,18 @@ config SPI_CADENCE_QUADSPI device with a Cadence QSPI controller and want to access the Flash as an MTD device. +config SPI_CADENCE_XSPI + tristate "Cadence XSPI controller" + depends on (OF || COMPILE_TEST) && HAS_IOMEM + depends on SPI_MEM + help + Enable support for the Cadence XSPI Flash controller. + + Cadence XSPI is a specialized controller for connecting an SPI + Flash over upto 8bit wide bus. Enable this option if you have a + device with a Cadence XSPI controller and want to access the + Flash as an MTD device. + config SPI_CLPS711X tristate "CLPS711X host SPI controller" depends on ARCH_CLPS711X || COMPILE_TEST |