[SCSI] ufs: add dme configuration primitives

Implements to support GET and SET operations of the DME.
These operations are used to configure the behavior of
the UNIPRO. Along with basic operation, {Peer/AttrSetType}
can be mixed.

Signed-off-by: Seungwon Jeon <tgih.jun@samsung.com>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Tested-by: Yaniv Gardi <ygardi@codeaurora.org>
Signed-off-by: Santosh Y <santoshsy@gmail.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

3 files changed, 145 insertions, 0 deletions

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 46b0754b4b76..a4ce6c462614 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -235,6 +235,18 @@ static inline int ufshcd_get_uic_cmd_result(struct ufs_hba *hba)
 }
 
 /**
+ * ufshcd_get_dme_attr_val - Get the value of attribute returned by UIC command
+ * @hba: Pointer to adapter instance
+ *
+ * This function gets UIC command argument3
+ * Returns 0 on success, non zero value on error
+ */
+static inline u32 ufshcd_get_dme_attr_val(struct ufs_hba *hba)
+{
+        return ufshcd_readl(hba, REG_UIC_COMMAND_ARG_3);
+}
+
+/**
  * ufshcd_get_req_rsp - returns the TR response transaction type
  * @ucd_rsp_ptr: pointer to response UPIU
  */
@@ -1374,6 +1386,80 @@ static int ufshcd_dme_link_startup(struct ufs_hba *hba)
 }
 
 /**
+ * ufshcd_dme_set_attr - UIC command for DME_SET, DME_PEER_SET
+ * @hba: per adapter instance
+ * @attr_sel: uic command argument1
+ * @attr_set: attribute set type as uic command argument2
+ * @mib_val: setting value as uic command argument3
+ * @peer: indicate whether peer or local
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
+                        u8 attr_set, u32 mib_val, u8 peer)
+{
+        struct uic_command uic_cmd = {0};
+        static const char *const action[] = {
+                "dme-set",
+                "dme-peer-set"
+        };
+        const char *set = action[!!peer];
+        int ret;
+
+        uic_cmd.command = peer ?
+                UIC_CMD_DME_PEER_SET : UIC_CMD_DME_SET;
+        uic_cmd.argument1 = attr_sel;
+        uic_cmd.argument2 = UIC_ARG_ATTR_TYPE(attr_set);
+        uic_cmd.argument3 = mib_val;
+
+        ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+        if (ret)
+                dev_err(hba->dev, "%s: attr-id 0x%x val 0x%x error code %d\n",
+                        set, UIC_GET_ATTR_ID(attr_sel), mib_val, ret);
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_dme_set_attr);
+
+/**
+ * ufshcd_dme_get_attr - UIC command for DME_GET, DME_PEER_GET
+ * @hba: per adapter instance
+ * @attr_sel: uic command argument1
+ * @mib_val: the value of the attribute as returned by the UIC command
+ * @peer: indicate whether peer or local
+ *
+ * Returns 0 on success, non-zero value on failure
+ */
+int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
+                        u32 *mib_val, u8 peer)
+{
+        struct uic_command uic_cmd = {0};
+        static const char *const action[] = {
+                "dme-get",
+                "dme-peer-get"
+        };
+        const char *get = action[!!peer];
+        int ret;
+
+        uic_cmd.command = peer ?
+                UIC_CMD_DME_PEER_GET : UIC_CMD_DME_GET;
+        uic_cmd.argument1 = attr_sel;
+
+        ret = ufshcd_send_uic_cmd(hba, &uic_cmd);
+        if (ret) {
+                dev_err(hba->dev, "%s: attr-id 0x%x error code %d\n",
+                        get, UIC_GET_ATTR_ID(attr_sel), ret);
+                goto out;
+        }
+
+        if (mib_val)
+                *mib_val = uic_cmd.argument3;
+out:
+        return ret;
+}
+EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr);
+
+/**
  * ufshcd_complete_dev_init() - checks device readiness
  * hba: per-adapter instance
  *
@@ -1908,6 +1994,8 @@ static void ufshcd_uic_cmd_compl(struct ufs_hba *hba)
         if (hba->active_uic_cmd) {
                 hba->active_uic_cmd->argument2 |=
                         ufshcd_get_uic_cmd_result(hba);
+                hba->active_uic_cmd->argument3 =
+                        ufshcd_get_dme_attr_val(hba);
                 complete(&hba->active_uic_cmd->done);
         }
 }
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 59c9c4848be1..648ab16d379c 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -263,4 +263,55 @@ static inline void check_upiu_size(void)
 extern int ufshcd_runtime_suspend(struct ufs_hba *hba);
 extern int ufshcd_runtime_resume(struct ufs_hba *hba);
 extern int ufshcd_runtime_idle(struct ufs_hba *hba);
+extern int ufshcd_dme_set_attr(struct ufs_hba *hba, u32 attr_sel,
+                               u8 attr_set, u32 mib_val, u8 peer);
+extern int ufshcd_dme_get_attr(struct ufs_hba *hba, u32 attr_sel,
+                               u32 *mib_val, u8 peer);
+
+/* UIC command interfaces for DME primitives */
+#define DME_LOCAL       0
+#define DME_PEER        1
+#define ATTR_SET_NOR    0       /* NORMAL */
+#define ATTR_SET_ST     1       /* STATIC */
+
+static inline int ufshcd_dme_set(struct ufs_hba *hba, u32 attr_sel,
+                                 u32 mib_val)
+{
+        return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_NOR,
+                                   mib_val, DME_LOCAL);
+}
+
+static inline int ufshcd_dme_st_set(struct ufs_hba *hba, u32 attr_sel,
+                                    u32 mib_val)
+{
+        return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_ST,
+                                   mib_val, DME_LOCAL);
+}
+
+static inline int ufshcd_dme_peer_set(struct ufs_hba *hba, u32 attr_sel,
+                                      u32 mib_val)
+{
+        return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_NOR,
+                                   mib_val, DME_PEER);
+}
+
+static inline int ufshcd_dme_peer_st_set(struct ufs_hba *hba, u32 attr_sel,
+                                         u32 mib_val)
+{
+        return ufshcd_dme_set_attr(hba, attr_sel, ATTR_SET_ST,
+                                   mib_val, DME_PEER);
+}
+
+static inline int ufshcd_dme_get(struct ufs_hba *hba,
+                                 u32 attr_sel, u32 *mib_val)
+{
+        return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_LOCAL);
+}
+
+static inline int ufshcd_dme_peer_get(struct ufs_hba *hba,
+                                      u32 attr_sel, u32 *mib_val)
+{
+        return ufshcd_dme_get_attr(hba, attr_sel, mib_val, DME_PEER);
+}
+
 #endif /* End of Header */
diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h
index 739ae3aade0e..1e1fe2668181 100644
--- a/drivers/scsi/ufs/ufshci.h
+++ b/drivers/scsi/ufs/ufshci.h
@@ -191,6 +191,12 @@ enum {
 #define CONFIG_RESULT_CODE_MASK         0xFF
 #define GENERIC_ERROR_CODE_MASK         0xFF
 
+#define UIC_ARG_MIB_SEL(attr, sel)      ((((attr) & 0xFFFF) << 16) |\
+                                         ((sel) & 0xFFFF))
+#define UIC_ARG_MIB(attr)               UIC_ARG_MIB_SEL(attr, 0)
+#define UIC_ARG_ATTR_TYPE(t)            (((t) & 0xFF) << 16)
+#define UIC_GET_ATTR_ID(v)              (((v) >> 16) & 0xFFFF)
+
 /* UIC Commands */
 enum {
         UIC_CMD_DME_GET                 = 0x01,