Merge tag 'armsoc-drivers' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc
[sfrench/cifs-2.6.git] / drivers / firmware / xilinx / zynqmp.c
index 74d9f13d72c45f4c1c9052d044b70d0c341ba53a..ecc339d846deba4f802ee741ca7e729c4fb748f7 100644 (file)
@@ -26,6 +26,9 @@
 
 static const struct zynqmp_eemi_ops *eemi_ops_tbl;
 
+static bool feature_check_enabled;
+static u32 zynqmp_pm_features[PM_API_MAX];
+
 static const struct mfd_cell firmware_devs[] = {
        {
                .name = "zynqmp_power_controller",
@@ -44,6 +47,8 @@ static int zynqmp_pm_ret_code(u32 ret_status)
        case XST_PM_SUCCESS:
        case XST_PM_DOUBLE_REQ:
                return 0;
+       case XST_PM_NO_FEATURE:
+               return -ENOTSUPP;
        case XST_PM_NO_ACCESS:
                return -EACCES;
        case XST_PM_ABORT_SUSPEND:
@@ -128,6 +133,39 @@ static noinline int do_fw_call_hvc(u64 arg0, u64 arg1, u64 arg2,
        return zynqmp_pm_ret_code((enum pm_ret_status)res.a0);
 }
 
+/**
+ * zynqmp_pm_feature() - Check weather given feature is supported or not
+ * @api_id:            API ID to check
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_feature(u32 api_id)
+{
+       int ret;
+       u32 ret_payload[PAYLOAD_ARG_CNT];
+       u64 smc_arg[2];
+
+       if (!feature_check_enabled)
+               return 0;
+
+       /* Return value if feature is already checked */
+       if (zynqmp_pm_features[api_id] != PM_FEATURE_UNCHECKED)
+               return zynqmp_pm_features[api_id];
+
+       smc_arg[0] = PM_SIP_SVC | PM_FEATURE_CHECK;
+       smc_arg[1] = api_id;
+
+       ret = do_fw_call(smc_arg[0], smc_arg[1], 0, ret_payload);
+       if (ret) {
+               zynqmp_pm_features[api_id] = PM_FEATURE_INVALID;
+               return PM_FEATURE_INVALID;
+       }
+
+       zynqmp_pm_features[api_id] = ret_payload[1];
+
+       return zynqmp_pm_features[api_id];
+}
+
 /**
  * zynqmp_pm_invoke_fn() - Invoke the system-level platform management layer
  *                        caller function depending on the configuration
@@ -162,6 +200,9 @@ int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
         */
        u64 smc_arg[4];
 
+       if (zynqmp_pm_feature(pm_api_id) == PM_FEATURE_INVALID)
+               return -ENOTSUPP;
+
        smc_arg[0] = PM_SIP_SVC | pm_api_id;
        smc_arg[1] = ((u64)arg1 << 32) | arg0;
        smc_arg[2] = ((u64)arg3 << 32) | arg2;
@@ -717,6 +758,8 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
                np = of_find_compatible_node(NULL, NULL, "xlnx,versal");
                if (!np)
                        return 0;
+
+               feature_check_enabled = true;
        }
        of_node_put(np);