This patch series adds Qualcomm SD Card Controller support in pl180 mmci driver. QCom SDCC is basically a pl180, but bit more customized, some of the register layouts and offsets are different to the ones mentioned in pl180 datasheet. The plan is to totally remove the standalone SDCC driver drivers/mmc/host/msm_sdcc.* and start using generic mmci driver for all Qualcomm parts, as we get chance to test on other Qcom boards.
To start using the existing mmci driver, a fake amba id for Qualcomm is added in patches: ARM: amba: Add Qualcomm vendor ID. mmc: mmci: Add Qualcomm Id to amba id table.
Second change is, adding a 3 clock cycle delay for register writes on QCOM SDCC registers, which is done in patches: mmc: mmci: Add register read/write wrappers. mmc: mmci: Add write delay to variant structure. mmc: mmci: Qcomm: Add 3 clock cycle delay after each register write
Third change was to accommodate DATCTRL and MMCICLK register layout changes in Qcom SDCC. Which is done in patches: mmc: mmci: Add Qcom datactrl register variant mmc: mmci: Add Qcom variations to MCICommand register. mmc: mmci: Qcom fix MCICLK register settings. mmc: mmci: Add clock support for Qualcomm.
Fourth major change was to add qcom specfic pio read function, the need for this is because the way MCIFIFOCNT register behaved in QCOM SDCC is very different to the one in pl180. This change is done in patch: mmc: mmci: Add Qcom specific pio_read function.
Last some Qcom unrelated changes to support Qcom are done in patches: mmc: mmci: use NSEC_PER_SEC macro mmc: mmci: move ST specific register extensions access under condition.
This patches are tested in PIO mode on IFC8064 board with both eMMC and external SD card. I would appreciate any feedback/suggestions on the overall approach.
Thanks, srini
Srinivas Kandagatla (12): ARM: amba: Add Qualcomm vendor ID. mmc: mmci: Add Qualcomm Id to amba id table mmc: mmci: Add Qcom datactrl register variant mmc: mmci: Add register read/write wrappers. mmc: mmci: use NSEC_PER_SEC macro mmc: mmci: Add write delay to variant structure. mmc: mmci: Qcomm: Add 3 clock cycle delay after each register write mmc: mmci: move ST specific register extensions access under condition. mmc: mmci: Qcom fix MCICLK register settings. mmc: mmci: Add clock support for Qualcomm. mmc: mmci: Add Qcom variations to MCICommand register. mmc: mmci: Add Qcom specific pio_read function.
drivers/mmc/host/mmci.c | 239 +++++++++++++++++++++++++++++++++------------- drivers/mmc/host/mmci.h | 28 ++++++ include/linux/amba/bus.h | 1 + 3 files changed, 202 insertions(+), 66 deletions(-)