On Mon, Jun 29, 2020 at 09:39:41AM -0700, Bhaumik Bhatt wrote:
> Device hardware specific information such as serial number and the OEM
> PK hash can be read using BHI and saved on host to identify the
> endpoint.
>
> Signed-off-by: Bhaumik Bhatt <bbhatt@xxxxxxxxxxxxxx>
> Reviewed-by: Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Thanks,
Mani
> ---
> drivers/bus/mhi/core/boot.c | 17 ++++++++++++++++-
> include/linux/mhi.h | 6 ++++++
> 2 files changed, 22 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/bus/mhi/core/boot.c b/drivers/bus/mhi/core/boot.c
> index 0b38014..24422f5 100644
> --- a/drivers/bus/mhi/core/boot.c
> +++ b/drivers/bus/mhi/core/boot.c
> @@ -392,13 +392,28 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
> void *buf;
> dma_addr_t dma_addr;
> size_t size;
> - int ret;
> + int i, ret;
>
> if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
> dev_err(dev, "Device MHI is not in valid state\n");
> return;
> }
>
> + /* save hardware info from BHI */
> + ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_SERIALNU,
> + &mhi_cntrl->serial_number);
> + if (ret)
> + dev_err(dev, "Could not capture serial number via BHI\n");
> +
> + for (i = 0; i < ARRAY_SIZE(mhi_cntrl->oem_pk_hash); i++) {
> + ret = mhi_read_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_OEMPKHASH(i),
> + &mhi_cntrl->oem_pk_hash[i]);
> + if (ret) {
> + dev_err(dev, "Could not capture OEM PK HASH via BHI\n");
> + break;
> + }
> + }
> +
> /* If device is in pass through, do reset to ready state transition */
> if (mhi_cntrl->ee == MHI_EE_PTHRU)
> goto fw_load_ee_pthru;
> diff --git a/include/linux/mhi.h b/include/linux/mhi.h
> index b1e8b4f..dad6246 100644
> --- a/include/linux/mhi.h
> +++ b/include/linux/mhi.h
> @@ -16,6 +16,8 @@
> #include <linux/wait.h>
> #include <linux/workqueue.h>
>
> +#define MHI_MAX_OEM_PK_HASH_SEGMENTS 16
> +
> struct mhi_chan;
> struct mhi_event;
> struct mhi_ctxt;
> @@ -315,6 +317,8 @@ struct mhi_controller_config {
> * @device_number: MHI controller device number
> * @major_version: MHI controller major revision number
> * @minor_version: MHI controller minor revision number
> + * @serial_number: MHI controller serial number obtained from BHI
> + * @oem_pk_hash: MHI controller OEM PK Hash obtained from BHI
> * @mhi_event: MHI event ring configurations table
> * @mhi_cmd: MHI command ring configurations table
> * @mhi_ctxt: MHI device context, shared memory between host and device
> @@ -394,6 +398,8 @@ struct mhi_controller {
> u32 device_number;
> u32 major_version;
> u32 minor_version;
> + u32 serial_number;
> + u32 oem_pk_hash[MHI_MAX_OEM_PK_HASH_SEGMENTS];
>
> struct mhi_event *mhi_event;
> struct mhi_cmd *mhi_cmd;
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
