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 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 | 644 ++++++++++++++++++
5 files changed, 733 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mmc/litex,mmc.yaml
create mode 100644 drivers/mmc/host/litex_mmc.c
--
2.31.1
