[PATCH v3 net-next 1/2] firmware: xilinx: add support for sd/gem config

[Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>]

From: Ronak Jain <ronak.jain@xilinx.com>

Add new APIs in firmware to configure SD/GEM registers. Internally
it calls PM IOCTL for below SD/GEM register configuration:
- SD/EMMC select
- SD slot type
- SD base clock
- SD 8 bit support
- SD fixed config
- GEM SGMII Mode
- GEM fixed config

Signed-off-by: Ronak Jain <ronak.jain@xilinx.com>
Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
---
- Changes for v3:
  Use enum kernel-doc comment style for enum pm_sd_config_type and
  pm_gem_config_type.

- Changes for v2:
  Use tab indent for zynqmp_pm_set_sd/gem_config() return
  documentation
---
 drivers/firmware/xilinx/zynqmp.c     | 31 +++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h | 45 ++++++++++++++++++++++++++++
 2 files changed, 76 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index d1f652802181..ff5cabe70a2b 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -1311,6 +1311,37 @@ int zynqmp_pm_get_feature_config(enum pm_feature_config_id id,
 				   id, 0, payload);
 }
 
+/**
+ * zynqmp_pm_set_sd_config - PM call to set value of SD config registers
+ * @node:	SD node ID
+ * @config:	The config type of SD registers
+ * @value:	Value to be set
+ *
+ * Return:	Returns 0 on success or error value on failure.
+ */
+int zynqmp_pm_set_sd_config(u32 node, enum pm_sd_config_type config, u32 value)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, node, IOCTL_SET_SD_CONFIG,
+				   config, value, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_set_sd_config);
+
+/**
+ * zynqmp_pm_set_gem_config - PM call to set value of GEM config registers
+ * @node:	GEM node ID
+ * @config:	The config type of GEM registers
+ * @value:	Value to be set
+ *
+ * Return:	Returns 0 on success or error value on failure.
+ */
+int zynqmp_pm_set_gem_config(u32 node, enum pm_gem_config_type config,
+			     u32 value)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, node, IOCTL_SET_GEM_CONFIG,
+				   config, value, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_set_gem_config);
+
 /**
  * struct zynqmp_pm_shutdown_scope - Struct for shutdown scope
  * @subtype:	Shutdown subtype
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 9f50dacbf7d6..76d2b3ebad84 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -153,6 +153,9 @@ enum pm_ioctl_id {
 	/* Runtime feature configuration */
 	IOCTL_SET_FEATURE_CONFIG = 26,
 	IOCTL_GET_FEATURE_CONFIG = 27,
+	/* Dynamic SD/GEM configuration */
+	IOCTL_SET_SD_CONFIG = 30,
+	IOCTL_SET_GEM_CONFIG = 31,
 };
 
 enum pm_query_id {
@@ -399,6 +402,30 @@ enum pm_feature_config_id {
 	PM_FEATURE_EXTWDT_VALUE = 4,
 };
 
+/**
+ * enum pm_sd_config_type - PM SD configuration.
+ * @SD_CONFIG_EMMC_SEL: To set SD_EMMC_SEL in CTRL_REG_SD and SD_SLOTTYPE
+ * @SD_CONFIG_BASECLK: To set SD_BASECLK in SD_CONFIG_REG1
+ * @SD_CONFIG_8BIT: To set SD_8BIT in SD_CONFIG_REG2
+ * @SD_CONFIG_FIXED: To set fixed config registers
+ */
+enum pm_sd_config_type {
+	SD_CONFIG_EMMC_SEL = 1,
+	SD_CONFIG_BASECLK = 2,
+	SD_CONFIG_8BIT = 3,
+	SD_CONFIG_FIXED = 4,
+};
+
+/**
+ * enum pm_gem_config_type - PM GEM configuration.
+ * @GEM_CONFIG_SGMII_MODE: To set GEM_SGMII_MODE in GEM_CLK_CTRL register
+ * @GEM_CONFIG_FIXED: To set fixed config registers
+ */
+enum pm_gem_config_type {
+	GEM_CONFIG_SGMII_MODE = 1,
+	GEM_CONFIG_FIXED = 2,
+};
+
 /**
  * struct zynqmp_pm_query_data - PM query data
  * @qid:	query ID
@@ -475,6 +502,9 @@ int zynqmp_pm_is_function_supported(const u32 api_id, const u32 id);
 int zynqmp_pm_set_feature_config(enum pm_feature_config_id id, u32 value);
 int zynqmp_pm_get_feature_config(enum pm_feature_config_id id, u32 *payload);
 int zynqmp_pm_register_sgi(u32 sgi_num, u32 reset);
+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);
 #else
 static inline int zynqmp_pm_get_api_version(u32 *version)
 {
@@ -745,6 +775,21 @@ static inline int zynqmp_pm_register_sgi(u32 sgi_num, u32 reset)
 {
 	return -ENODEV;
 }
+
+static inline int zynqmp_pm_set_sd_config(u32 node,
+					  enum pm_sd_config_type config,
+					  u32 value)
+{
+	return -ENODEV;
+}
+
+static inline int zynqmp_pm_set_gem_config(u32 node,
+					   enum pm_gem_config_type config,
+					   u32 value)
+{
+	return -ENODEV;
+}
+
 #endif
 
 #endif /* __FIRMWARE_ZYNQMP_H__ */
-- 
2.25.1