diff options
| author | Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> | 2020-03-24 09:10:45 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-26 17:51:07 +0300 |
| commit | 3316ab2b45f6bf4797d8d65b22fda3cc13318890 (patch) | |
| tree | 8cf015a625e9d65ef366b0dff54957639942552f /drivers/bus | |
| parent | 10cea23b6aae15e8324f4101d785687f2c514fe5 (diff) | |
| download | linux-3316ab2b45f6bf4797d8d65b22fda3cc13318890.tar.xz | |
bus: mhi: core: Add support for reading MHI info from device
The MHI register base has several registers used for getting the MHI
specific information such as version, family, major, and minor numbers
from the device. This information can be used by the controller drivers
for usecases such as applying quirks for a specific revision etc...
While at it, let's also rearrange the local variables
in mhi_register_controller().
Suggested-by: Hemant Kumar <hemantk@codeaurora.org>
Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20200324061050.14845-3-manivannan.sadhasivam@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/mhi/core/init.c | 19 | ||||
| -rw-r--r-- | drivers/bus/mhi/core/internal.h | 10 |
2 files changed, 27 insertions, 2 deletions
diff --git a/drivers/bus/mhi/core/init.c b/drivers/bus/mhi/core/init.c index eb7f556a8531..d136f6c6ca78 100644 --- a/drivers/bus/mhi/core/init.c +++ b/drivers/bus/mhi/core/init.c @@ -802,12 +802,12 @@ error_ev_cfg: int mhi_register_controller(struct mhi_controller *mhi_cntrl, struct mhi_controller_config *config) { - int ret; - int i; struct mhi_event *mhi_event; struct mhi_chan *mhi_chan; struct mhi_cmd *mhi_cmd; struct mhi_device *mhi_dev; + u32 soc_info; + int ret, i; if (!mhi_cntrl) return -EINVAL; @@ -874,6 +874,21 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, mhi_cntrl->unmap_single = mhi_unmap_single_no_bb; } + /* Read the MHI device info */ + ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->regs, + SOC_HW_VERSION_OFFS, &soc_info); + if (ret) + goto error_alloc_dev; + + mhi_cntrl->family_number = (soc_info & SOC_HW_VERSION_FAM_NUM_BMSK) >> + SOC_HW_VERSION_FAM_NUM_SHFT; + mhi_cntrl->device_number = (soc_info & SOC_HW_VERSION_DEV_NUM_BMSK) >> + SOC_HW_VERSION_DEV_NUM_SHFT; + mhi_cntrl->major_version = (soc_info & SOC_HW_VERSION_MAJOR_VER_BMSK) >> + SOC_HW_VERSION_MAJOR_VER_SHFT; + mhi_cntrl->minor_version = (soc_info & SOC_HW_VERSION_MINOR_VER_BMSK) >> + SOC_HW_VERSION_MINOR_VER_SHFT; + /* Register controller with MHI bus */ mhi_dev = mhi_alloc_device(mhi_cntrl); if (IS_ERR(mhi_dev)) { diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index 18066302e6e2..5deadfaa053a 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -196,6 +196,16 @@ extern struct bus_type mhi_bus_type; #define BHIE_RXVECSTATUS_STATUS_XFER_COMPL (0x02) #define BHIE_RXVECSTATUS_STATUS_ERROR (0x03) +#define SOC_HW_VERSION_OFFS (0x224) +#define SOC_HW_VERSION_FAM_NUM_BMSK (0xF0000000) +#define SOC_HW_VERSION_FAM_NUM_SHFT (28) +#define SOC_HW_VERSION_DEV_NUM_BMSK (0x0FFF0000) +#define SOC_HW_VERSION_DEV_NUM_SHFT (16) +#define SOC_HW_VERSION_MAJOR_VER_BMSK (0x0000FF00) +#define SOC_HW_VERSION_MAJOR_VER_SHFT (8) +#define SOC_HW_VERSION_MINOR_VER_BMSK (0x000000FF) +#define SOC_HW_VERSION_MINOR_VER_SHFT (0) + #define EV_CTX_RESERVED_MASK GENMASK(7, 0) #define EV_CTX_INTMODC_MASK GENMASK(15, 8) #define EV_CTX_INTMODC_SHIFT 8 |