i2c: xgene-slimpro: Support v2

This patch supports xgene-slimpro-i2c v2 which uses the non-cachable memory
as the PCC shared memory.

Signed-off-by: Hoan Tran <hotran@apm.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

1 files changed, 26 insertions, 4 deletions

diff --git a/drivers/i2c/busses/i2c-xgene-slimpro.c b/drivers/i2c/busses/i2c-xgene-slimpro.c
index 7e89ba6fcf6f..a7ac746018ad 100644
--- a/drivers/i2c/busses/i2c-xgene-slimpro.c
+++ b/drivers/i2c/busses/i2c-xgene-slimpro.c
@@ -129,6 +129,11 @@ struct slimpro_i2c_dev {
 #define to_slimpro_i2c_dev(cl)  \
                 container_of(cl, struct slimpro_i2c_dev, mbox_client)
 
+enum slimpro_i2c_version {
+        XGENE_SLIMPRO_I2C_V1 = 0,
+        XGENE_SLIMPRO_I2C_V2 = 1,
+};
+
 /*
  * This function tests and clears a bitmask then returns its old value
  */
@@ -476,6 +481,15 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
                 }
         } else {
                 struct acpi_pcct_hw_reduced *cppc_ss;
+                const struct acpi_device_id *acpi_id;
+                int version = XGENE_SLIMPRO_I2C_V1;
+
+                acpi_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
+                                            &pdev->dev);
+                if (!acpi_id)
+                        return -EINVAL;
+
+                version = (int)acpi_id->driver_data;
 
                 if (device_property_read_u32(&pdev->dev, "pcc-channel",
                                              &ctx->mbox_idx))
@@ -514,9 +528,16 @@ static int xgene_slimpro_i2c_probe(struct platform_device *pdev)
                  */
                 ctx->comm_base_addr = cppc_ss->base_address;
                 if (ctx->comm_base_addr) {
-                        ctx->pcc_comm_addr = memremap(ctx->comm_base_addr,
-                                                      cppc_ss->length,
-                                                      MEMREMAP_WB);
+                        if (version == XGENE_SLIMPRO_I2C_V2)
+                                ctx->pcc_comm_addr = memremap(
+                                                        ctx->comm_base_addr,
+                                                        cppc_ss->length,
+                                                        MEMREMAP_WT);
+                        else
+                                ctx->pcc_comm_addr = memremap(
+                                                        ctx->comm_base_addr,
+                                                        cppc_ss->length,
+                                                        MEMREMAP_WB);
                 } else {
                         dev_err(&pdev->dev, "Failed to get PCC comm region\n");
                         rc = -ENOENT;
@@ -581,7 +602,8 @@ MODULE_DEVICE_TABLE(of, xgene_slimpro_i2c_dt_ids);
 
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id xgene_slimpro_i2c_acpi_ids[] = {
-        {"APMC0D40", 0},
+        {"APMC0D40", XGENE_SLIMPRO_I2C_V1},
+        {"APMC0D8B", XGENE_SLIMPRO_I2C_V2},
         {}
 };
 MODULE_DEVICE_TABLE(acpi, xgene_slimpro_i2c_acpi_ids);