firmware: xilinx: Add zynqmp_pm_get_chipid() API

This patch adds a new API to provide access to the
hardware related data like soc revision, IDCODE... etc.

Signed-off-by: Nava kishore Manne <nava.manne@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

2 files changed, 26 insertions, 0 deletions

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 70b50377ae5f..16a23bc4c2c3 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -187,6 +187,29 @@ static int zynqmp_pm_get_api_version(u32 *version)
 }
 
 /**
+ * zynqmp_pm_get_chipid - Get silicon ID registers
+ * @idcode:     IDCODE register
+ * @version:    version register
+ *
+ * Return:      Returns the status of the operation and the idcode and version
+ *              registers in @idcode and @version.
+ */
+static int zynqmp_pm_get_chipid(u32 *idcode, u32 *version)
+{
+        u32 ret_payload[PAYLOAD_ARG_CNT];
+        int ret;
+
+        if (!idcode || !version)
+                return -EINVAL;
+
+        ret = zynqmp_pm_invoke_fn(PM_GET_CHIPID, 0, 0, 0, 0, ret_payload);
+        *idcode = ret_payload[1];
+        *version = ret_payload[2];
+
+        return ret;
+}
+
+/**
  * zynqmp_pm_get_trustzone_version() - Get secure trustzone firmware version
  * @version:    Returned version value
  *
@@ -509,6 +532,7 @@ static int zynqmp_pm_reset_get_status(const enum zynqmp_pm_reset reset,
 
 static const struct zynqmp_eemi_ops eemi_ops = {
         .get_api_version = zynqmp_pm_get_api_version,
+        .get_chipid = zynqmp_pm_get_chipid,
         .query_data = zynqmp_pm_query_data,
         .clock_enable = zynqmp_pm_clock_enable,
         .clock_disable = zynqmp_pm_clock_disable,
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 07c587a0b06e..5a1f19848100 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -36,6 +36,7 @@ enum pm_api_id {
         PM_GET_API_VERSION = 1,
         PM_RESET_ASSERT = 17,
         PM_RESET_GET_STATUS,
+        PM_GET_CHIPID = 24,
         PM_IOCTL = 34,
         PM_QUERY_DATA,
         PM_CLOCK_ENABLE,
@@ -224,6 +225,7 @@ struct zynqmp_pm_query_data {
 
 struct zynqmp_eemi_ops {
         int (*get_api_version)(u32 *version);
+        int (*get_chipid)(u32 *idcode, u32 *version);
         int (*query_data)(struct zynqmp_pm_query_data qdata, u32 *out);
         int (*clock_enable)(u32 clock_id);
         int (*clock_disable)(u32 clock_id);