From: Bhaumik Bhatt <bbhatt@codeaurora.org>
To: manivannan.sadhasivam@linaro.org
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
hemantk@codeaurora.org, jhugo@codeaurora.org,
Bhaumik Bhatt <bbhatt@codeaurora.org>
Subject: [PATCH v2 5/6] bus: mhi: core: Read and save device hardware information from BHI
Date: Tue, 12 May 2020 10:42:13 -0700 [thread overview]
Message-ID: <1589305334-19466-6-git-send-email-bbhatt@codeaurora.org> (raw)
In-Reply-To: <1589305334-19466-1-git-send-email-bbhatt@codeaurora.org>
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@codeaurora.org>
Reviewed-by: Jeffrey Hugo <jhugo@codeaurora.org>
---
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 026a624..42e4d1e 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -19,6 +19,8 @@
#define MHI_VOTE_BUS BIT(0) /* do not disable the mhi bus */
#define MHI_VOTE_DEVICE BIT(1) /* prevent mhi device from entering lpm */
+#define MHI_MAX_OEM_PK_HASH_SEGMENTS 16
+
struct mhi_chan;
struct mhi_event;
struct mhi_ctxt;
@@ -318,6 +320,8 @@ 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
@@ -397,6 +401,8 @@ 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
next prev parent reply other threads:[~2020-05-12 17:42 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-12 17:42 [PATCH v2 0/6] Introduce features and debugfs/sysfs entries for MHI Bhaumik Bhatt
2020-05-12 17:42 ` [PATCH v2 1/6] bus: mhi: core: Introduce independent voting mechanism Bhaumik Bhatt
2020-05-12 17:42 ` [PATCH v2 2/6] bus: mhi: core: Use generic name field for an MHI device Bhaumik Bhatt
2020-05-12 17:42 ` [PATCH v2 3/6] bus: mhi: core: Introduce helper function to check device state Bhaumik Bhatt
2020-05-12 17:42 ` [PATCH v2 4/6] bus: mhi: core: Introduce debugfs entries and counters for MHI Bhaumik Bhatt
2020-05-12 18:51 ` kbuild test robot
2020-05-12 19:43 ` kbuild test robot
2020-05-12 17:42 ` Bhaumik Bhatt [this message]
2020-05-12 17:42 ` [PATCH v2 6/6] bus: mhi: core: Introduce sysfs entries " Bhaumik Bhatt
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