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firmware: imx: scu-irq: support identifying SCU wakeup source from sysfs 

Record SCU wakeup interrupt in /sys/power/pm_wakeup_irq
The user can further identify the exact wakeup source by using the
following interface:
cat /sys/firmware/scu_wakeup_source/wakeup_src

The above will print the wake groups and the irqs that could have
contributed to waking up the kernel. For example if ON/OFF button was the
wakeup source:
cat /sys/firmware/scu_wakeup_source/wakeup_src
Wakeup source group = 3, irq = 0x1

The user can refer to the SCFW API documentation to identify all the
wake groups and irqs.

Signed-off-by: Ranjani Vaidyanathan <ranjani.vaidyanathan@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Ranjani Vaidyanathan 2023-08-07 20:14:32 +08:00 committed by Shawn Guo
parent 6c59ce485f
commit c081197a33
1 changed files with 70 additions and 0 deletions
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70
drivers/firmware/imx/imx-scu-irq.c
View File

@ -9,8 +9,10 @@
#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/firmware/imx/ipc.h>
#include <linux/firmware/imx/sci.h>
#include <linux/kobject.h>
#include <linux/mailbox_client.h>
#include <linux/suspend.h>
#include <linux/sysfs.h>
#define IMX_SC_IRQ_FUNC_ENABLE 1
#define IMX_SC_IRQ_FUNC_STATUS 2
@ -40,6 +42,20 @@ struct imx_sc_msg_irq_enable {
u8 enable;
} __packed;
struct scu_wakeup {
u32 mask;
u32 wakeup_src;
bool valid;
};
/* Sysfs functions */
static struct kobject *wakeup_obj;
static ssize_t wakeup_source_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf);
static struct kobj_attribute wakeup_source_attr =
__ATTR(wakeup_src, 0660, wakeup_source_show, NULL);
static struct scu_wakeup scu_irq_wakeup[IMX_SC_IRQ_NUM_GROUP];
static struct imx_sc_ipc *imx_sc_irq_ipc_handle;
static struct work_struct imx_sc_irq_work;
static BLOCKING_NOTIFIER_HEAD(imx_scu_irq_notifier_chain);
@ -71,6 +87,11 @@ static void imx_scu_irq_work_handler(struct work_struct *work)
u8 i;
for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
if (scu_irq_wakeup[i].mask) {
scu_irq_wakeup[i].valid = false;
scu_irq_wakeup[i].wakeup_src = 0;
}
ret = imx_scu_irq_get_status(i, &irq_status);
if (ret) {
pr_err("get irq group %d status failed, ret %d\n",
@ -80,6 +101,12 @@ static void imx_scu_irq_work_handler(struct work_struct *work)
if (!irq_status)
continue;
if (scu_irq_wakeup[i].mask & irq_status) {
scu_irq_wakeup[i].valid = true;
scu_irq_wakeup[i].wakeup_src = irq_status & scu_irq_wakeup[i].mask;
} else {
scu_irq_wakeup[i].wakeup_src = irq_status;
}
pm_system_wakeup();
imx_scu_irq_notifier_call_chain(irq_status, &i);
@ -135,6 +162,11 @@ int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
pr_err("enable irq failed, group %d, mask %d, ret %d\n",
group, mask, ret);
if (enable)
scu_irq_wakeup[group].mask |= mask;
else
scu_irq_wakeup[group].mask &= ~mask;
return ret;
}
EXPORT_SYMBOL(imx_scu_irq_group_enable);
@ -144,6 +176,25 @@ static void imx_scu_irq_callback(struct mbox_client *c, void *msg)
schedule_work(&imx_sc_irq_work);
}
static ssize_t wakeup_source_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf)
{
int i;
for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
if (!scu_irq_wakeup[i].wakeup_src)
continue;
if (scu_irq_wakeup[i].valid)
sprintf(buf, "Wakeup source group = %d, irq = 0x%x\n",
i, scu_irq_wakeup[i].wakeup_src);
else
sprintf(buf, "Spurious SCU wakeup, group = %d, irq = 0x%x\n",
i, scu_irq_wakeup[i].wakeup_src);
}
return strlen(buf);
}
int imx_scu_enable_general_irq_channel(struct device *dev)
{
struct of_phandle_args spec;
@ -183,6 +234,25 @@ int imx_scu_enable_general_irq_channel(struct device *dev)
mu_resource_id = IMX_SC_R_MU_0A + i;
/* Create directory under /sysfs/firmware */
wakeup_obj = kobject_create_and_add("scu_wakeup_source", firmware_kobj);
if (!wakeup_obj) {
ret = -ENOMEM;
goto free_ch;
}
ret = sysfs_create_file(wakeup_obj, &wakeup_source_attr.attr);
if (ret) {
dev_err(dev, "Cannot create wakeup source src file......\n");
kobject_put(wakeup_obj);
goto free_ch;
}
return 0;
free_ch:
mbox_free_channel(ch);
return ret;
}
EXPORT_SYMBOL(imx_scu_enable_general_irq_channel);