Hello,
Here is a series introducing a new driver for the different memory
controllers of the Aspeed AST2500 and AST2400 SoCs. Each SoC has at
least a memory controller for the BMC firmware and another one for the
host firmware. The register set are mostly compatible but there are
some slight differences on the AST2400.
The driver only supports SPI type flash.
Tested on:
* OpenPOWER Palmetto (AST2400) with
FMC controller : n25q256a
SPI controller : mx25l25635e and n25q512ax3
* Evaluation board (AST2500) with
FMC controller : w25q256
SPI controller : w25q256
* OpenPOWER Witherspoon (AST2500) with
FMC controller : mx25l25635e * 2
SPI controller : mx66l1g45g
Changes since v4:
- improved IO routines with Cyrille's suggestions
- added dummy bytes hanling for fast read commands
- removed the 'label' property from jedec,spi-nor. Needs more
discussion.
Changes since v3:
- reworked IO routines to use io{read,write}32_rep
- changed config option to SPI_ASPEED_SMC
- fixed aspeed_smc_chip_setup_init() returned value
Changes since v2:
- splitted patch to distinguish AST2400 and AST2500 controllers
- fixed controller names
- introduced prepare/unprepare ops
- introduced a aspeed_smc_setup_flash() routine
- various cleanups
Changes since v1:
- added a set4b ops to handle difference in the controllers
- simplified the IO routines
- prepared for fast read using dummy cycles
Work in progress:
- read optimization using higher SPI clock frequencies
- command mode to direct reads from AHB
- DMA support
Thanks,
C.
Cédric Le Goater (3):
mtd: spi-nor: add memory controllers for the Aspeed AST2500 SoC
mtd: aspeed: add memory controllers for the Aspeed AST2400 SoC
mtd: spi-nor: bindings for the Aspeed memory controllers
.../devicetree/bindings/mtd/aspeed-smc.txt | 51 ++
drivers/mtd/spi-nor/Kconfig | 10 +
drivers/mtd/spi-nor/Makefile | 1 +
drivers/mtd/spi-nor/aspeed-smc.c | 759 +++++++++++++++++++++
4 files changed, 821 insertions(+)
create mode 100644 Documentation/devicetree/bindings/mtd/aspeed-smc.txt
create mode 100644 drivers/mtd/spi-nor/aspeed-smc.c
--
2.7.4
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