soc: qcom: llcc-qcom: Extract major hardware version

The major hardware version of the LLCC IP is encoded in its
LLCC_COMMON_HW_INFO register. Extract the version and cache it in the
driver data so that it can be used to implement version specific
functionality like enabling Write sub cache for given SCID.
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
[mani: splitted the version extract as a single patch and few cleanups]
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20201130093924.45057-4-manivannan.sadhasivam@linaro.orgSigned-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

drivers/soc/qcom/llcc-qcom.c

@@ -4,6 +4,7 @@
  *
  */
 
+#include <linux/bitfield.h>
 #include <linux/bitmap.h>
 #include <linux/bitops.h>
 #include <linux/device.h>
@@ -35,6 +36,9 @@
 
 #define CACHE_LINE_SIZE_SHIFT         6
 
+#define LLCC_COMMON_HW_INFO           0x00030000
+#define LLCC_MAJOR_VERSION_MASK       GENMASK(31, 24)
+
 #define LLCC_COMMON_STATUS0           0x0003000c
 #define LLCC_LB_CNT_MASK              GENMASK(31, 28)
 #define LLCC_LB_CNT_SHIFT             28
@@ -476,6 +480,7 @@ static int qcom_llcc_probe(struct platform_device *pdev)
 	const struct qcom_llcc_config *cfg;
 	const struct llcc_slice_config *llcc_cfg;
 	u32 sz;
+	u32 version;
 
 	drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
 	if (!drv_data) {
@@ -496,6 +501,13 @@ static int qcom_llcc_probe(struct platform_device *pdev)
 		goto err;
 	}
 
+	/* Extract major version of the IP */
+	ret = regmap_read(drv_data->bcast_regmap, LLCC_COMMON_HW_INFO, &version);
+	if (ret)
+		goto err;
+
+	drv_data->major_version = FIELD_GET(LLCC_MAJOR_VERSION_MASK, version);
+
 	ret = regmap_read(drv_data->regmap, LLCC_COMMON_STATUS0,
 						&num_banks);
 	if (ret)

include/linux/soc/qcom/llcc-qcom.h

@@ -79,6 +79,7 @@ struct llcc_edac_reg_data {
  * @bitmap: Bit map to track the active slice ids
  * @offsets: Pointer to the bank offsets array
  * @ecc_irq: interrupt for llcc cache error detection and reporting
+ * @major_version: Indicates the LLCC major version
  */
 struct llcc_drv_data {
 	struct regmap *regmap;
@@ -91,6 +92,7 @@ struct llcc_drv_data {
 	unsigned long *bitmap;
 	u32 *offsets;
 	int ecc_irq;
+	u32 major_version;
 };
 
 #if IS_ENABLED(CONFIG_QCOM_LLCC)