[PATCH] drm/pm/swsmu: add ras eeprom i2c function for smu13 v13_0_0

[YiPeng Chai]

Add ras eeprom i2c function for smu13 v13_0_0.

Signed-off-by: YiPeng Chai <YiPeng.Chai at amd.com>
Acked-by: Evan Quan <evan.quan at amd.com>
Acked-by: Alex Deucher <alexander.deucher at amd.com>
---
 .../drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c  | 157 ++++++++++++++++++
 1 file changed, 157 insertions(+)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
index ce2fa04e3926..2b83191e8006 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu13/smu_v13_0_0_ppt.c
@@ -196,6 +196,7 @@ static struct cmn2asic_mapping smu_v13_0_0_table_map[SMU_TABLE_COUNT] = {
 	TAB_MAP(DRIVER_SMU_CONFIG),
 	TAB_MAP(ACTIVITY_MONITOR_COEFF),
 	[SMU_TABLE_COMBO_PPTABLE] = {1, TABLE_COMBO_PPTABLE},
+	TAB_MAP(I2C_COMMANDS),
 };
 
 static struct cmn2asic_mapping smu_v13_0_0_pwr_src_map[SMU_POWER_SOURCE_COUNT] = {
@@ -1606,9 +1607,165 @@ static bool smu_v13_0_0_is_mode1_reset_supported(struct smu_context *smu)
 	return true;
 }
 
+static int smu_v13_0_0_i2c_xfer(struct i2c_adapter *i2c_adap,
+				   struct i2c_msg *msg, int num_msgs)
+{
+	struct amdgpu_smu_i2c_bus *smu_i2c = i2c_get_adapdata(i2c_adap);
+	struct amdgpu_device *adev = smu_i2c->adev;
+	struct smu_context *smu = adev->powerplay.pp_handle;
+	struct smu_table_context *smu_table = &smu->smu_table;
+	struct smu_table *table = &smu_table->driver_table;
+	SwI2cRequest_t *req, *res = (SwI2cRequest_t *)table->cpu_addr;
+	int i, j, r, c;
+	u16 dir;
+
+	if (!adev->pm.dpm_enabled)
+		return -EBUSY;
+
+	req = kzalloc(sizeof(*req), GFP_KERNEL);
+	if (!req)
+		return -ENOMEM;
+
+	req->I2CcontrollerPort = smu_i2c->port;
+	req->I2CSpeed = I2C_SPEED_FAST_400K;
+	req->SlaveAddress = msg[0].addr << 1; /* wants an 8-bit address */
+	dir = msg[0].flags & I2C_M_RD;
+
+	for (c = i = 0; i < num_msgs; i++) {
+		for (j = 0; j < msg[i].len; j++, c++) {
+			SwI2cCmd_t *cmd = &req->SwI2cCmds[c];
+
+			if (!(msg[i].flags & I2C_M_RD)) {
+				/* write */
+				cmd->CmdConfig |= CMDCONFIG_READWRITE_MASK;
+				cmd->ReadWriteData = msg[i].buf[j];
+			}
+
+			if ((dir ^ msg[i].flags) & I2C_M_RD) {
+				/* The direction changes.
+				 */
+				dir = msg[i].flags & I2C_M_RD;
+				cmd->CmdConfig |= CMDCONFIG_RESTART_MASK;
+			}
+
+			req->NumCmds++;
+
+			/*
+			 * Insert STOP if we are at the last byte of either last
+			 * message for the transaction or the client explicitly
+			 * requires a STOP at this particular message.
+			 */
+			if ((j == msg[i].len - 1) &&
+			    ((i == num_msgs - 1) || (msg[i].flags & I2C_M_STOP))) {
+				cmd->CmdConfig &= ~CMDCONFIG_RESTART_MASK;
+				cmd->CmdConfig |= CMDCONFIG_STOP_MASK;
+			}
+		}
+	}
+	mutex_lock(&adev->pm.mutex);
+	r = smu_cmn_update_table(smu, SMU_TABLE_I2C_COMMANDS, 0, req, true);
+	mutex_unlock(&adev->pm.mutex);
+	if (r)
+		goto fail;
+
+	for (c = i = 0; i < num_msgs; i++) {
+		if (!(msg[i].flags & I2C_M_RD)) {
+			c += msg[i].len;
+			continue;
+		}
+		for (j = 0; j < msg[i].len; j++, c++) {
+			SwI2cCmd_t *cmd = &res->SwI2cCmds[c];
+
+			msg[i].buf[j] = cmd->ReadWriteData;
+		}
+	}
+	r = num_msgs;
+fail:
+	kfree(req);
+	return r;
+}
+
+static u32 smu_v13_0_0_i2c_func(struct i2c_adapter *adap)
+{
+	return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+static const struct i2c_algorithm smu_v13_0_0_i2c_algo = {
+	.master_xfer = smu_v13_0_0_i2c_xfer,
+	.functionality = smu_v13_0_0_i2c_func,
+};
+
+static const struct i2c_adapter_quirks smu_v13_0_0_i2c_control_quirks = {
+	.flags = I2C_AQ_COMB | I2C_AQ_COMB_SAME_ADDR | I2C_AQ_NO_ZERO_LEN,
+	.max_read_len  = MAX_SW_I2C_COMMANDS,
+	.max_write_len = MAX_SW_I2C_COMMANDS,
+	.max_comb_1st_msg_len = 2,
+	.max_comb_2nd_msg_len = MAX_SW_I2C_COMMANDS - 2,
+};
+
+static int smu_v13_0_0_i2c_control_init(struct smu_context *smu)
+{
+	struct amdgpu_device *adev = smu->adev;
+	int res, i;
+
+	for (i = 0; i < MAX_SMU_I2C_BUSES; i++) {
+		struct amdgpu_smu_i2c_bus *smu_i2c = &adev->pm.smu_i2c[i];
+		struct i2c_adapter *control = &smu_i2c->adapter;
+
+		smu_i2c->adev = adev;
+		smu_i2c->port = i;
+		mutex_init(&smu_i2c->mutex);
+		control->owner = THIS_MODULE;
+		control->class = I2C_CLASS_SPD;
+		control->dev.parent = &adev->pdev->dev;
+		control->algo = &smu_v13_0_0_i2c_algo;
+		snprintf(control->name, sizeof(control->name), "AMDGPU SMU %d", i);
+		control->quirks = &smu_v13_0_0_i2c_control_quirks;
+		i2c_set_adapdata(control, smu_i2c);
+
+		res = i2c_add_adapter(control);
+		if (res) {
+			DRM_ERROR("Failed to register hw i2c, err: %d\n", res);
+			goto Out_err;
+		}
+	}
+
+	/* assign the buses used for the FRU EEPROM and RAS EEPROM */
+	/* XXX ideally this would be something in a vbios data table */
+	adev->pm.ras_eeprom_i2c_bus = &adev->pm.smu_i2c[1].adapter;
+	adev->pm.fru_eeprom_i2c_bus = &adev->pm.smu_i2c[0].adapter;
+
+	return 0;
+Out_err:
+	for ( ; i >= 0; i--) {
+		struct amdgpu_smu_i2c_bus *smu_i2c = &adev->pm.smu_i2c[i];
+		struct i2c_adapter *control = &smu_i2c->adapter;
+
+		i2c_del_adapter(control);
+	}
+	return res;
+}
+
+static void smu_v13_0_0_i2c_control_fini(struct smu_context *smu)
+{
+	struct amdgpu_device *adev = smu->adev;
+	int i;
+
+	for (i = 0; i < MAX_SMU_I2C_BUSES; i++) {
+		struct amdgpu_smu_i2c_bus *smu_i2c = &adev->pm.smu_i2c[i];
+		struct i2c_adapter *control = &smu_i2c->adapter;
+
+		i2c_del_adapter(control);
+	}
+	adev->pm.ras_eeprom_i2c_bus = NULL;
+	adev->pm.fru_eeprom_i2c_bus = NULL;
+}
+
 static const struct pptable_funcs smu_v13_0_0_ppt_funcs = {
 	.get_allowed_feature_mask = smu_v13_0_0_get_allowed_feature_mask,
 	.set_default_dpm_table = smu_v13_0_0_set_default_dpm_table,
+	.i2c_init = smu_v13_0_0_i2c_control_init,
+	.i2c_fini = smu_v13_0_0_i2c_control_fini,
 	.is_dpm_running = smu_v13_0_0_is_dpm_running,
 	.dump_pptable = smu_v13_0_0_dump_pptable,
 	.init_microcode = smu_v13_0_init_microcode,
-- 
2.25.1