From: Alex Deucher <alexander.deucher@xxxxxxx>
And handle more than just EEPROMs.
v2: fix restart handling between transactions.
v3: handle 7 to 8 bit addr conversion
v4: Fix &req --> req. (Luben T)
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Luben Tuikov <luben.tuikov@xxxxxxx>
Reviewed-by: Luben Tuikov <luben.tuikov@xxxxxxx>
---
.../gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c | 116 ++++++++++++++++++
1 file changed, 116 insertions(+)
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
index 0e67517682e319..f426f488c02561 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/navi10_ppt.c
@@ -2735,6 +2735,120 @@ static ssize_t navi10_get_legacy_gpu_metrics(struct smu_context *smu,
return sizeof(struct gpu_metrics_v1_3);
}
+static int navi10_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs, int num)
+{
+ struct amdgpu_device *adev = to_amdgpu_device(i2c_adap);
+ struct smu_table_context *smu_table = &adev->smu.smu_table;
+ struct smu_table *table = &smu_table->driver_table;
+ SwI2cRequest_t *req, *res = (SwI2cRequest_t *)table->cpu_addr;
+ u16 bytes_to_transfer, remaining_bytes, msg_bytes;
+ u16 available_bytes = MAX_SW_I2C_COMMANDS;
+ int i, j, r, c;
+ u8 slave;
+
+ /* only support a single slave addr per transaction */
+ slave = msgs[0].addr;
+ for (i = 0; i < num; i++) {
+ if (slave != msgs[i].addr)
+ return -EINVAL;
+ bytes_to_transfer += min(msgs[i].len, available_bytes);
+ available_bytes -= bytes_to_transfer;
+ }
+
+ req = kzalloc(sizeof(*req), GFP_KERNEL);
+ if (!req)
+ return -ENOMEM;
+
+ req->I2CcontrollerPort = 1;
+ req->I2CSpeed = I2C_SPEED_FAST_400K;
+ req->SlaveAddress = slave << 1; /* 8 bit addresses */
+ req->NumCmds = bytes_to_transfer;
+
+ remaining_bytes = bytes_to_transfer;
+ c = 0;
+ for (i = 0; i < num; i++) {
+ struct i2c_msg *msg = &msgs[i];
+
+ msg_bytes = min(msg->len, remaining_bytes);
+ for (j = 0; j < msg_bytes; j++) {
+ SwI2cCmd_t *cmd = &req->SwI2cCmds[c++];
+
+ remaining_bytes--;
+ if (!(msg[i].flags & I2C_M_RD)) {
+ /* write */
+ cmd->CmdConfig |= I2C_CMD_WRITE;
+ cmd->RegisterAddr = msg->buf[j];
+ }
+ if ((msg[i].flags & I2C_M_STOP) ||
+ (!remaining_bytes))
+ cmd->CmdConfig |= CMDCONFIG_STOP_MASK;
+ if ((i > 0) && !(msg[i].flags & I2C_M_NOSTART))
+ cmd->CmdConfig |= CMDCONFIG_RESTART_BIT;
+ }
+ }
+ mutex_lock(&adev->smu.mutex);
+ r = smu_cmn_update_table(&adev->smu, SMU_TABLE_I2C_COMMANDS, 0, req, true);
+ mutex_unlock(&adev->smu.mutex);
+ if (r)
+ goto fail;
+
+ remaining_bytes = bytes_to_transfer;
+ c = 0;
+ for (i = 0; i < num; i++) {
+ struct i2c_msg *msg = &msgs[i];
+
+ msg_bytes = min(msg->len, remaining_bytes);
+ for (j = 0; j < msg_bytes; j++) {
+ SwI2cCmd_t *cmd = &res->SwI2cCmds[c++];
+
+ remaining_bytes--;
+ if (msg[i].flags & I2C_M_RD)
+ msg->buf[j] = cmd->Data;
+ }
+ }
+ r = bytes_to_transfer;
+
+fail:
+ kfree(req);
+
+ return r;
+}
+
+static u32 navi10_i2c_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
+}
+
+
+static const struct i2c_algorithm navi10_i2c_algo = {
+ .master_xfer = navi10_i2c_xfer,
+ .functionality = navi10_i2c_func,
+};
+
+static int navi10_i2c_control_init(struct smu_context *smu, struct i2c_adapter *control)
+{
+ struct amdgpu_device *adev = to_amdgpu_device(control);
+ int res;
+
+ control->owner = THIS_MODULE;
+ control->class = I2C_CLASS_SPD;
+ control->dev.parent = &adev->pdev->dev;
+ control->algo = &navi10_i2c_algo;
+ snprintf(control->name, sizeof(control->name), "AMDGPU SMU");
+
+ res = i2c_add_adapter(control);
+ if (res)
+ DRM_ERROR("Failed to register hw i2c, err: %d\n", res);
+
+ return res;
+}
+
+static void navi10_i2c_control_fini(struct smu_context *smu, struct i2c_adapter *control)
+{
+ i2c_del_adapter(control);
+}
+
static ssize_t navi10_get_gpu_metrics(struct smu_context *smu,
void **table)
{
@@ -3078,6 +3192,8 @@ static const struct pptable_funcs navi10_ppt_funcs = {
.set_default_dpm_table = navi10_set_default_dpm_table,
.dpm_set_vcn_enable = navi10_dpm_set_vcn_enable,
.dpm_set_jpeg_enable = navi10_dpm_set_jpeg_enable,
+ .i2c_init = navi10_i2c_control_init,
+ .i2c_fini = navi10_i2c_control_fini,
.print_clk_levels = navi10_print_clk_levels,
.force_clk_levels = navi10_force_clk_levels,
.populate_umd_state_clk = navi10_populate_umd_state_clk,
--
2.32.0
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