[PATCH v6 2/3] firmware: xilinx: Implement ZynqMP power management APIs

Jolly Shah
2019-01-29T20:39:07Z

Add Xilinx ZynqMP firmware APIs to set suspend mode
and inform firmware that master has initialized its
own power management.

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Jolly Shah <jollys@xilinx.com>
---
drivers/firmware/xilinx/zynqmp.c | 29 +++++++++++++++++++++++++++++
include/linux/firmware/xlnx-zynqmp.h | 20 ++++++++++++++++++++
2 files changed, 49 insertions(+)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 70b5037..8065e33 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -507,6 +507,33 @@ static int zynqmp_pm_reset_get_status(const enum zynqmp_pm_reset reset,
return ret;
}

+/**
+ * zynqmp_pm_init_finalize() - PM call to inform firmware that the caller
+ * master has initialized its own power management
+ *
+ * This API function is to be used for notify the power management controller
+ * about the completed power management initialization.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_init_finalize(void)
+{
+ return zynqmp_pm_invoke_fn(PM_PM_INIT_FINALIZE, 0, 0, 0, 0, NULL);
+}
+
+/**
+ * zynqmp_pm_set_suspend_mode() - Set system suspend mode
+ * @mode: Mode to set for system suspend
+ *
+ * This API function is used to set mode of system suspend.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+static int zynqmp_pm_set_suspend_mode(u32 mode)
+{
+ return zynqmp_pm_invoke_fn(PM_SET_SUSPEND_MODE, mode, 0, 0, 0, NULL);
+}
+
static const struct zynqmp_eemi_ops eemi_ops = {
.get_api_version = zynqmp_pm_get_api_version,
.query_data = zynqmp_pm_query_data,
@@ -522,6 +549,8 @@ static const struct zynqmp_eemi_ops eemi_ops = {
.ioctl = zynqmp_pm_ioctl,
.reset_assert = zynqmp_pm_reset_assert,
.reset_get_status = zynqmp_pm_reset_get_status,
+ .init_finalize = zynqmp_pm_init_finalize,
+ .set_suspend_mode = zynqmp_pm_set_suspend_mode,
};

/**
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 07c587a..f84d700 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -28,14 +28,23 @@
/* SMC SIP service Call Function Identifier Prefix */
#define PM_SIP_SVC 0xC2000000
#define PM_GET_TRUSTZONE_VERSION 0xa03
+#define PM_SET_SUSPEND_MODE 0xa02
+#define GET_CALLBACK_DATA 0xa01

/* Number of 32bits values in payload */
#define PAYLOAD_ARG_CNT 4U

+/* Number of arguments for a callback */
+#define CB_ARG_CNT 4
+
+/* Payload size (consists of callback API ID + arguments) */
+#define CB_PAYLOAD_SIZE (CB_ARG_CNT + 1)
+
enum pm_api_id {
PM_GET_API_VERSION = 1,
PM_RESET_ASSERT = 17,
PM_RESET_GET_STATUS,
+ PM_PM_INIT_FINALIZE = 21,
PM_IOCTL = 34,
PM_QUERY_DATA,
PM_CLOCK_ENABLE,
@@ -208,6 +217,12 @@ enum zynqmp_pm_reset {
ZYNQMP_PM_RESET_END = ZYNQMP_PM_RESET_PS_PL3
};

+enum zynqmp_pm_suspend_reason {
+ SUSPEND_POWER_REQUEST = 201,
+ SUSPEND_ALERT,
+ SUSPEND_SYSTEM_SHUTDOWN,
+};
+
/**
* struct zynqmp_pm_query_data - PM query data
* @qid: query ID
@@ -238,8 +253,13 @@ struct zynqmp_eemi_ops {
int (*reset_assert)(const enum zynqmp_pm_reset reset,
const enum zynqmp_pm_reset_action assert_flag);
int (*reset_get_status)(const enum zynqmp_pm_reset reset, u32 *status);
+ int (*init_finalize)(void);
+ int (*set_suspend_mode)(u32 mode);
};

+int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
+ u32 arg2, u32 arg3, u32 *ret_payload);
+
#if IS_REACHABLE(CONFIG_ARCH_ZYNQMP)
const struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void);
#else
--
2.7.4