soc: ti: wkup_m3_ipc: Add rtc_only with ddr in self refresh mode support

Adds rtc_only support. This needs resume function to shutdown and
reboot the m3.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>

diff --git a/drivers/soc/ti/wkup_m3_ipc.c b/drivers/soc/ti/wkup_m3_ipc.c
index 369aef5e7228e959883c58d0870737d860fbf8a4..b732c39e27543b0e01823d68d01eb67412ff67c8 100644 (file)
--- a/drivers/soc/ti/wkup_m3_ipc.c
+++ b/drivers/soc/ti/wkup_m3_ipc.c
@@ -329,12 +329,24 @@ static int wkup_m3_finish_low_power(struct wkup_m3_ipc *m3_ipc)
        return 0;
 }
 
+/**
+ * wkup_m3_set_rtc_only - Set the rtc_only flag
+ * @wkup_m3_wakeup: struct wkup_m3_wakeup_src * gets assigned the
+ *                  wakeup src value
+ */
+static void wkup_m3_set_rtc_only(struct wkup_m3_ipc *m3_ipc)
+{
+       if (m3_ipc_state)
+               m3_ipc_state->is_rtc_only = true;
+}
+
 static struct wkup_m3_ipc_ops ipc_ops = {
        .set_mem_type = wkup_m3_set_mem_type,
        .set_resume_address = wkup_m3_set_resume_address,
        .prepare_low_power = wkup_m3_prepare_low_power,
        .finish_low_power = wkup_m3_finish_low_power,
        .request_pm_status = wkup_m3_request_pm_status,
+       .set_rtc_only = wkup_m3_set_rtc_only,
 };
 
 /**
@@ -484,6 +496,32 @@ static int wkup_m3_ipc_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM
+static int wkup_m3_ipc_suspend(struct device *dev)
+{
+       /*
+        * Nothing needs to be done on suspend even with rtc_only flag set
+        */
+       return 0;
+}
+
+static int wkup_m3_ipc_resume(struct device *dev)
+{
+       if (m3_ipc_state->is_rtc_only) {
+               rproc_shutdown(m3_ipc_state->rproc);
+               rproc_boot(m3_ipc_state->rproc);
+       }
+
+       m3_ipc_state->is_rtc_only = false;
+
+       return 0;
+}
+
+static const struct dev_pm_ops wkup_m3_ipc_pm_ops = {
+       SET_SYSTEM_SLEEP_PM_OPS(wkup_m3_ipc_suspend, wkup_m3_ipc_resume)
+};
+#endif
+
 static const struct of_device_id wkup_m3_ipc_of_match[] = {
        { .compatible = "ti,am3352-wkup-m3-ipc", },
        { .compatible = "ti,am4372-wkup-m3-ipc", },
@@ -497,6 +535,9 @@ static struct platform_driver wkup_m3_ipc_driver = {
        .driver = {
                .name = "wkup_m3_ipc",
                .of_match_table = wkup_m3_ipc_of_match,
+#ifdef CONFIG_PM
+               .pm = &wkup_m3_ipc_pm_ops,
+#endif
        },
 };
 

diff --git a/include/linux/wkup_m3_ipc.h b/include/linux/wkup_m3_ipc.h
index d6ba7d39a62fecb497e87cbeca5a1f335675754b..d639df15e8ba485cbaec59bec25db722b34a28f9 100644 (file)
--- a/include/linux/wkup_m3_ipc.h
+++ b/include/linux/wkup_m3_ipc.h
@@ -40,6 +40,7 @@ struct wkup_m3_ipc {
        struct mbox_chan *mbox;
 
        struct wkup_m3_ipc_ops *ops;
+       int is_rtc_only;
 };
 
 struct wkup_m3_ipc_ops {
@@ -48,8 +49,10 @@ struct wkup_m3_ipc_ops {
        int (*prepare_low_power)(struct wkup_m3_ipc *m3_ipc, int state);
        int (*finish_low_power)(struct wkup_m3_ipc *m3_ipc);
        int (*request_pm_status)(struct wkup_m3_ipc *m3_ipc);
+       void (*set_rtc_only)(struct wkup_m3_ipc *m3_ipc);
 };
 
 struct wkup_m3_ipc *wkup_m3_ipc_get(void);
 void wkup_m3_ipc_put(struct wkup_m3_ipc *m3_ipc);
+void wkup_m3_set_rtc_only_mode(void);
 #endif /* _LINUX_WKUP_M3_IPC_H */