Add support for the LiteX SD-Card device, LiteSDCard.
LiteSDCard is a simple SD-Card interface available as part of the LiteX
environment, used with various RISC-V and other FPGA based SoCs.
New in v4:
Doc/dt/bindings/mmc/litex,mmc.yaml:
- fixed `dt_binding_check` errors uncovered by Rob's script
drivers/mmc/host/litex_mmc.c:
- struct litex_mmc_host fields re-ordered so that `pahole` reports
no holes in either 32- or 64-bit builds
- litex_mmc_set_bus_width() now encapsulates check for
host->is_bus_width_set
- litex_mmc_request() - factor out dma data setup into separate
helper function: litex_mmc_do_dma()
>New in v3:
>
> MAINTAINERS:
>
> - picked up acked-by Joel
> - added listing for liteeth driver
> - added Joel as additional co-maintainer (thanks!)
>
> Doc/dt/bindings/mmc/litex,mmc.yaml:
>
> - picked up r/b Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> in DT
> bindings document (please let me know if that was premature, and
> happy to take further review if needed :)
> - add dedicated DT property for source clock frequency
>
> drivers/mmc/host/litex_mmc.c:
>
> - fixed function signature (no line split), and naming (litex_mmc_*)
> - more informative MODULE_AUTHOR() entries
> - also added matching "Copyright" entries in file header
> - fixed description in Kconfig
> - fixed DT documentation
> - removed magic constants
> - removed litex_map_status(), have sdcard_wait_done() return *real*
> error codes directly instead.
> - streamlined litex_mmc_reponse_len()
> - call litex_mmc_set_bus_width() only once, and ensure it returns
> correct error code(s)
> - use readx_poll_timeout() -- more concise -- instead of
> read_poll_timeout()
> - use dev_err() in litex_mmc_send_cmd() (instead of pr_err())
> - litex_mmc_setclk() will update host->clock before returning
> - separate irq initialization into its own function,
> litex_mmc_irq_init()
> - document rationale for f_min, f_max
> - use dmam_alloc_coherent(), which simplifies cleanup significantly
> - large `if (data) { ... }` block in litex_mmc_request() left as-is,
> there are too many variables shared with the rest of the parent
> function body to easily separate (e.g., `len`, `transfer`, `direct`).
> If this is indeed a blocker, I can take another shot at refactoring
> it in a future revision!
> - bump dma_set_mask_and_coherent() to 64-bits on suitable
> architectures
> - clock source picked up from dedicated DT clock reference property
> - remove gpio card-detect logic (needs testing and a dt binding
> example before being eligible for upstream inclusion)
>
>> New in v2:
>> - reword info message in litex_set_clk()
>> - streamline code in litex_map_status()
>> - fix typos in Kconfig (thanks Randy Dunlap <rdunlap@xxxxxxxxxxxxx>)
>> - improvements suggested by Stafford Horne <shorne@xxxxxxxxx>
>> - allow COMPILE_TEST in Kconfig
>> - use read_poll_timeout() when waiting for cmd/data/DMA
>> xfer completion
>> - include interrupt.h (thanks kernel test robot <lkp@xxxxxxxxx>)
Gabriel Somlo (3):
MAINTAINERS: co-maintain LiteX platform
dt-bindings: mmc: Add bindings for LiteSDCard
mmc: Add driver for LiteX's LiteSDCard interface
.../devicetree/bindings/mmc/litex,mmc.yaml | 72 ++
MAINTAINERS | 9 +-
drivers/mmc/host/Kconfig | 9 +
drivers/mmc/host/Makefile | 1 +
drivers/mmc/host/litex_mmc.c | 654 ++++++++++++++++++
5 files changed, 743 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mmc/litex,mmc.yaml
create mode 100644 drivers/mmc/host/litex_mmc.c
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2.31.1
