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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>
hifive-unleashed-5.1
Keerthy 2018-07-04 20:19:06 -07:00 committed by Santosh Shilimkar
parent 38853979e6
commit 7a872b6fb7
2 changed files with 44 additions and 0 deletions
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41
drivers/soc/ti/wkup_m3_ipc.c
View File

@ -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
},
};

3
include/linux/wkup_m3_ipc.h
View File

@ -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 */