platform/x86/amd/pmc: Isolate STB code changes to a new file

Since S2D (Spill to DRAM) uses different message port offsets compared to
PMC message offsets for communication with PMFW, relocate the S2D macros
from pmc.c to a new file, mp1_stb.c, for better code organization.

Following this change, it is logical to introduce a new structure,
"struct stb_arg," to pass the message, argument, and response offset
details to PMFW via the amd_pmc_send_cmd() call. Additionally, move the
s2d_msg_id member from amd_pmc_dev into the new structure.

Reviewed-by: Mario Limonciello <mario.limonciello@amd.com>
Co-developed-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Sanket Goswami <Sanket.Goswami@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20241108070822.3912689-6-Shyam-sundar.S-k@amd.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

3 files changed, 36 insertions, 23 deletions

diff --git a/drivers/platform/x86/amd/pmc/mp1_stb.c b/drivers/platform/x86/amd/pmc/mp1_stb.c
index 9ee629db9af9..6a54dd3e7f4c 100644
--- a/drivers/platform/x86/amd/pmc/mp1_stb.c
+++ b/drivers/platform/x86/amd/pmc/mp1_stb.c
@@ -31,6 +31,11 @@
 #define STB_FORCE_FLUSH_DATA		0xCF
 #define FIFO_SIZE		4096
 
+/* STB S2D(Spill to DRAM) has different message port offset */
+#define AMD_S2D_REGISTER_MESSAGE	0xA20
+#define AMD_S2D_REGISTER_RESPONSE	0xA80
+#define AMD_S2D_REGISTER_ARGUMENT	0xA88
+
 static bool enable_stb;
 module_param(enable_stb, bool, 0644);
 MODULE_PARM_DESC(enable_stb, "Enable the STB debug mechanism");
@@ -170,7 +175,7 @@ static int amd_stb_debugfs_open_v2(struct inode *inode, struct file *filp)
 		return amd_stb_handle_efr(filp);
 
 	/* Get the num_samples to calculate the last push location */
-	ret = amd_pmc_send_cmd(dev, S2D_NUM_SAMPLES, &num_samples, dev->s2d_msg_id, true);
+	ret = amd_pmc_send_cmd(dev, S2D_NUM_SAMPLES, &num_samples, dev->stb_arg.s2d_msg_id, true);
 	/* Clear msg_port for other SMU operation */
 	dev->msg_port = MSG_PORT_PMC;
 	if (ret) {
@@ -233,18 +238,24 @@ static bool amd_is_stb_supported(struct amd_pmc_dev *dev)
 	switch (dev->cpu_id) {
 	case AMD_CPU_ID_YC:
 	case AMD_CPU_ID_CB:
-		dev->s2d_msg_id = 0xBE;
-		return true;
+		dev->stb_arg.s2d_msg_id = 0xBE;
+		break;
 	case AMD_CPU_ID_PS:
-		dev->s2d_msg_id = 0x85;
-		return true;
+		dev->stb_arg.s2d_msg_id = 0x85;
+		break;
 	case PCI_DEVICE_ID_AMD_1AH_M20H_ROOT:
 	case PCI_DEVICE_ID_AMD_1AH_M60H_ROOT:
-		dev->s2d_msg_id = 0xDE;
-		return true;
+		dev->stb_arg.s2d_msg_id = 0xDE;
+		break;
 	default:
 		return false;
 	}
+
+	dev->stb_arg.msg = AMD_S2D_REGISTER_MESSAGE;
+	dev->stb_arg.arg = AMD_S2D_REGISTER_ARGUMENT;
+	dev->stb_arg.resp = AMD_S2D_REGISTER_RESPONSE;
+
+	return true;
 }
 
 int amd_stb_s2d_init(struct amd_pmc_dev *dev)
@@ -269,18 +280,18 @@ int amd_stb_s2d_init(struct amd_pmc_dev *dev)
 	/* Spill to DRAM feature uses separate SMU message port */
 	dev->msg_port = MSG_PORT_S2D;
 
-	amd_pmc_send_cmd(dev, S2D_TELEMETRY_SIZE, &size, dev->s2d_msg_id, true);
+	amd_pmc_send_cmd(dev, S2D_TELEMETRY_SIZE, &size, dev->stb_arg.s2d_msg_id, true);
 	if (size != S2D_TELEMETRY_BYTES_MAX)
 		return -EIO;
 
 	/* Get DRAM size */
-	ret = amd_pmc_send_cmd(dev, S2D_DRAM_SIZE, &dev->dram_size, dev->s2d_msg_id, true);
+	ret = amd_pmc_send_cmd(dev, S2D_DRAM_SIZE, &dev->dram_size, dev->stb_arg.s2d_msg_id, true);
 	if (ret || !dev->dram_size)
 		dev->dram_size = S2D_TELEMETRY_DRAMBYTES_MAX;
 
 	/* Get STB DRAM address */
-	amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_LOW, &phys_addr_low, dev->s2d_msg_id, true);
-	amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_HIGH, &phys_addr_hi, dev->s2d_msg_id, true);
+	amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_LOW, &phys_addr_low, dev->stb_arg.s2d_msg_id, true);
+	amd_pmc_send_cmd(dev, S2D_PHYS_ADDR_HIGH, &phys_addr_hi, dev->stb_arg.s2d_msg_id, true);
 
 	stb_phys_addr = ((u64)phys_addr_hi << 32 | phys_addr_low);
 
diff --git a/drivers/platform/x86/amd/pmc/pmc.c b/drivers/platform/x86/amd/pmc/pmc.c
index 0c6d25e17d1b..7b3a367814b0 100644
--- a/drivers/platform/x86/amd/pmc/pmc.c
+++ b/drivers/platform/x86/amd/pmc/pmc.c
@@ -44,11 +44,6 @@
 #define AMD_PMC_STB_S2IDLE_RESTORE	0xC6000002
 #define AMD_PMC_STB_S2IDLE_CHECK	0xC6000003
 
-/* STB S2D(Spill to DRAM) has different message port offset */
-#define AMD_S2D_REGISTER_MESSAGE	0xA20
-#define AMD_S2D_REGISTER_RESPONSE	0xA80
-#define AMD_S2D_REGISTER_ARGUMENT	0xA88
-
 /* Base address of SMU for mapping physical address to virtual address */
 #define AMD_PMC_MAPPING_SIZE		0x01000
 #define AMD_PMC_BASE_ADDR_OFFSET	0x10000
@@ -466,9 +461,9 @@ static void amd_pmc_dump_registers(struct amd_pmc_dev *dev)
 	u32 value, message, argument, response;
 
 	if (dev->msg_port == MSG_PORT_S2D) {
-		message = AMD_S2D_REGISTER_MESSAGE;
-		argument = AMD_S2D_REGISTER_ARGUMENT;
-		response = AMD_S2D_REGISTER_RESPONSE;
+		message = dev->stb_arg.msg;
+		argument = dev->stb_arg.arg;
+		response = dev->stb_arg.resp;
 	} else {
 		message = dev->smu_msg;
 		argument = AMD_PMC_REGISTER_ARGUMENT;
@@ -493,9 +488,9 @@ int amd_pmc_send_cmd(struct amd_pmc_dev *dev, u32 arg, u32 *data, u8 msg, bool r
 	mutex_lock(&dev->lock);
 
 	if (dev->msg_port == MSG_PORT_S2D) {
-		message = AMD_S2D_REGISTER_MESSAGE;
-		argument = AMD_S2D_REGISTER_ARGUMENT;
-		response = AMD_S2D_REGISTER_RESPONSE;
+		message = dev->stb_arg.msg;
+		argument = dev->stb_arg.arg;
+		response = dev->stb_arg.resp;
 	} else {
 		message = dev->smu_msg;
 		argument = AMD_PMC_REGISTER_ARGUMENT;
diff --git a/drivers/platform/x86/amd/pmc/pmc.h b/drivers/platform/x86/amd/pmc/pmc.h
index f22256db8290..2c640bd8de82 100644
--- a/drivers/platform/x86/amd/pmc/pmc.h
+++ b/drivers/platform/x86/amd/pmc/pmc.h
@@ -30,6 +30,13 @@ struct amd_mp2_dev {
 	bool is_stb_data;
 };
 
+struct stb_arg {
+	u32 s2d_msg_id;
+	u32 msg;
+	u32 arg;
+	u32 resp;
+};
+
 struct amd_pmc_dev {
 	void __iomem *regbase;
 	void __iomem *smu_virt_addr;
@@ -40,7 +47,6 @@ struct amd_pmc_dev {
 	u32 active_ips;
 	u32 dram_size;
 	u32 num_ips;
-	u32 s2d_msg_id;
 	u32 smu_msg;
 /* SMU version information */
 	u8 smu_program;
@@ -55,6 +61,7 @@ struct amd_pmc_dev {
 	struct quirk_entry *quirks;
 	bool disable_8042_wakeup;
 	struct amd_mp2_dev *mp2;
+	struct stb_arg stb_arg;
 };
 
 void amd_pmc_process_restore_quirks(struct amd_pmc_dev *dev);