[PATCH 1/3] firmware: zynqmp: Add support to access efuses

[lukas.funke-oss at weidmueller.com]

From: Lukas Funke <lukas.funke at weidmueller.com>

Add functions to access efuses through PMU firmware
interface.

Signed-off-by: Lukas Funke <lukas.funke at weidmueller.com>
---

 drivers/firmware/firmware-zynqmp.c | 31 ++++++++++++++++++++++++++++++
 include/zynqmp_firmware.h          |  2 ++
 2 files changed, 33 insertions(+)

diff --git a/drivers/firmware/firmware-zynqmp.c b/drivers/firmware/firmware-zynqmp.c
index f99507d86c6..7483f2a8709 100644
--- a/drivers/firmware/firmware-zynqmp.c
+++ b/drivers/firmware/firmware-zynqmp.c
@@ -210,6 +210,37 @@ int zynqmp_pm_feature(const u32 api_id)
 	return ret_payload[1] & FIRMWARE_VERSION_MASK;
 }
 
+int zynqmp_pm_get_chipid(u32 *idcode, u32 *version)
+{
+	int ret;
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+
+	if (!idcode || !version)
+		return -EINVAL;
+
+	ret = xilinx_pm_request(PM_GET_CHIPID, 0, 0, 0, 0, ret_payload);
+	*idcode = ret_payload[1];
+	*version = ret_payload[2];
+
+	return ret;
+}
+
+int zynqmp_pm_efuse_access(const u64 address, u32 *out)
+{
+	int ret;
+	u32 ret_payload[PAYLOAD_ARG_CNT];
+
+	if (!out)
+		return -EINVAL;
+
+	ret = xilinx_pm_request(PM_EFUSE_ACCESS, upper_32_bits(address),
+				lower_32_bits(address), 0, 0, ret_payload);
+
+	*out = ret_payload[1];
+
+	return ret;
+}
+
 int zynqmp_pm_is_function_supported(const u32 api_id, const u32 id)
 {
 	int ret;
diff --git a/include/zynqmp_firmware.h b/include/zynqmp_firmware.h
index 73198a6a6ea..7f18b4d59bf 100644
--- a/include/zynqmp_firmware.h
+++ b/include/zynqmp_firmware.h
@@ -453,6 +453,8 @@ int xilinx_pm_request(u32 api_id, u32 arg0, u32 arg1, u32 arg2,
 int zynqmp_pm_set_sd_config(u32 node, enum pm_sd_config_type config, u32 value);
 int zynqmp_pm_set_gem_config(u32 node, enum pm_gem_config_type config,
 			     u32 value);
+int zynqmp_pm_get_chipid(u32 *idcode, u32 *version);
+int zynqmp_pm_efuse_access(const u64 address, u32 *out);
 int zynqmp_pm_is_function_supported(const u32 api_id, const u32 id);
 int zynqmp_mmio_read(const u32 address, u32 *value);
 int zynqmp_mmio_write(const u32 address, const u32 mask, const u32 value);
-- 
2.30.2