soc: qcom: smem: Add a feature code getter

Recent (SM8550+ ish) Qualcomm SoCs have a new mechanism for precisely
identifying the specific SKU and the precise speed bin (in the general
meaning of this word, anyway): a pair of values called Product Code
and Feature Code.

Based on this information, we can deduce the available frequencies for
things such as Adreno. In the case of Adreno specifically, Pcode is
useless for non-prototype SoCs.

Introduce a getter for the feature code and export it.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240605-topic-smem_speedbin-v2-2-8989d7e3d176@linaro.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 7191fa0c087f2ba278863944f3b9dbe5373fb6af..e40aac281b06179a6232afcfb4994792b4e6a0d0 100644 (file)
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -795,6 +795,39 @@ int qcom_smem_get_soc_id(u32 *id)
 }
 EXPORT_SYMBOL_GPL(qcom_smem_get_soc_id);
 
+/**
+ * qcom_smem_get_feature_code() - return the feature code
+ * @code: On success, return the feature code here.
+ *
+ * Look up the feature code identifier from SMEM and return it.
+ *
+ * Return: 0 on success, negative errno on failure.
+ */
+int qcom_smem_get_feature_code(u32 *code)
+{
+       struct socinfo *info;
+       u32 raw_code;
+
+       info = qcom_smem_get(QCOM_SMEM_HOST_ANY, SMEM_HW_SW_BUILD_ID, NULL);
+       if (IS_ERR(info))
+               return PTR_ERR(info);
+
+       /* This only makes sense for socinfo >= 16 */
+       if (__le32_to_cpu(info->fmt) < SOCINFO_VERSION(0, 16))
+               return -EOPNOTSUPP;
+
+       raw_code = __le32_to_cpu(info->feature_code);
+
+       /* Ensure the value makes sense */
+       if (raw_code > SOCINFO_FC_INT_MAX)
+               raw_code = SOCINFO_FC_UNKNOWN;
+
+       *code = raw_code;
+
+       return 0;
+}
+EXPORT_SYMBOL_GPL(qcom_smem_get_feature_code);
+
 static int qcom_smem_get_sbl_version(struct qcom_smem *smem)
 {
        struct smem_header *header;

diff --git a/include/linux/soc/qcom/smem.h b/include/linux/soc/qcom/smem.h
index a36a3b9d4929e5f38d4c156ff4419a69c38e56da..0943bf419e115b73a04af846b9f411e4db3673f6 100644 (file)
--- a/include/linux/soc/qcom/smem.h
+++ b/include/linux/soc/qcom/smem.h
@@ -13,5 +13,6 @@ int qcom_smem_get_free_space(unsigned host);
 phys_addr_t qcom_smem_virt_to_phys(void *p);
 
 int qcom_smem_get_soc_id(u32 *id);
+int qcom_smem_get_feature_code(u32 *code);
 
 #endif

diff --git a/include/linux/soc/qcom/socinfo.h b/include/linux/soc/qcom/socinfo.h
index 10e0a4c287f49dc8f0aff62f4d756a48e68a8264..608950443eeef68e51f1fcfb5ed03b90a5030fc6 100644 (file)
--- a/include/linux/soc/qcom/socinfo.h
+++ b/include/linux/soc/qcom/socinfo.h
@@ -3,6 +3,8 @@
 #ifndef __QCOM_SOCINFO_H__
 #define __QCOM_SOCINFO_H__
 
+#include <linux/types.h>
+
 /*
  * SMEM item id, used to acquire handles to respective
  * SMEM region.
@@ -82,4 +84,28 @@ struct socinfo {
        __le32 boot_core;
 };
 
+/* Internal feature codes */
+enum qcom_socinfo_feature_code {
+       /* External feature codes */
+       SOCINFO_FC_UNKNOWN = 0x0,
+       SOCINFO_FC_AA,
+       SOCINFO_FC_AB,
+       SOCINFO_FC_AC,
+       SOCINFO_FC_AD,
+       SOCINFO_FC_AE,
+       SOCINFO_FC_AF,
+       SOCINFO_FC_AG,
+       SOCINFO_FC_AH,
+};
+
+/* Internal feature codes */
+/* Valid values: 0 <= n <= 0xf */
+#define SOCINFO_FC_Yn(n)               (0xf1 + (n))
+#define SOCINFO_FC_INT_MAX             SOCINFO_FC_Yn(0xf)
+
+/* Product codes */
+#define SOCINFO_PC_UNKNOWN             0
+#define SOCINFO_PCn(n)                 ((n) + 1)
+#define SOCINFO_PC_RESERVE             (BIT(31) - 1)
+
 #endif