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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2019-2020 NXP
*
* Implementation of the SCU IRQ functions using MU.
*
*/
#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/firmware/imx/sci.h>
#include <linux/mailbox_client.h>
#include <linux/suspend.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#define IMX_SC_IRQ_FUNC_ENABLE 1
#define IMX_SC_IRQ_FUNC_STATUS 2
static u32 mu_resource_id;
struct imx_sc_msg_irq_get_status {
struct imx_sc_rpc_msg hdr;
union {
struct {
u16 resource;
u8 group;
u8 reserved;
} __packed req;
struct {
u32 status;
} resp;
} data;
};
struct imx_sc_msg_irq_enable {
struct imx_sc_rpc_msg hdr;
u32 mask;
u16 resource;
u8 group;
u8 enable;
} __packed;
struct scu_wakeup {
u32 mask;
u32 wakeup_src;
bool valid;
};
/* Sysfs functions */
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);
int imx_scu_irq_register_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(
&imx_scu_irq_notifier_chain, nb);
}
EXPORT_SYMBOL(imx_scu_irq_register_notifier);
int imx_scu_irq_unregister_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(
&imx_scu_irq_notifier_chain, nb);
}
EXPORT_SYMBOL(imx_scu_irq_unregister_notifier);
static int imx_scu_irq_notifier_call_chain(unsigned long status, u8 *group)
{
return blocking_notifier_call_chain(&imx_scu_irq_notifier_chain,
status, (void *)group);
}
static void imx_scu_irq_work_handler(struct work_struct *work)
{
u32 irq_status;
int ret;
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",
i, ret);
return;
}
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);
}
}
int imx_scu_irq_get_status(u8 group, u32 *irq_status)
{
struct imx_sc_msg_irq_get_status msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
int ret;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_IRQ;
hdr->func = IMX_SC_IRQ_FUNC_STATUS;
hdr->size = 2;
msg.data.req.resource = mu_resource_id;
msg.data.req.group = group;
ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
if (ret)
return ret;
if (irq_status)
*irq_status = msg.data.resp.status;
return 0;
}
EXPORT_SYMBOL(imx_scu_irq_get_status);
int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
{
struct imx_sc_msg_irq_enable msg;
struct imx_sc_rpc_msg *hdr = &msg.hdr;
int ret;
if (!imx_sc_irq_ipc_handle)
return -EPROBE_DEFER;
hdr->ver = IMX_SC_RPC_VERSION;
hdr->svc = IMX_SC_RPC_SVC_IRQ;
hdr->func = IMX_SC_IRQ_FUNC_ENABLE;
hdr->size = 3;
msg.resource = mu_resource_id;
msg.group = group;
msg.mask = mask;
msg.enable = enable;
ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
if (ret)
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);
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)
{
u8 i = 0, size = 0;
for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
if (scu_irq_wakeup[i].wakeup_src != 0) {
if (scu_irq_wakeup[i].valid)
size += sprintf(buf + size, "Wakeup source group = %d, irq = 0x%x\n",
i, scu_irq_wakeup[i].wakeup_src);
else
size += sprintf(buf + size, "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;
struct mbox_client *cl;
struct mbox_chan *ch;
int ret = 0, i = 0;
ret = imx_scu_get_handle(&imx_sc_irq_ipc_handle);
if (ret)
return ret;
cl = devm_kzalloc(dev, sizeof(*cl), GFP_KERNEL);
if (!cl)
return -ENOMEM;
cl->dev = dev;
cl->rx_callback = imx_scu_irq_callback;
/* SCU general IRQ uses general interrupt channel 3 */
ch = mbox_request_channel_byname(cl, "gip3");
if (IS_ERR(ch)) {
ret = PTR_ERR(ch);
dev_err(dev, "failed to request mbox chan gip3, ret %d\n", ret);
devm_kfree(dev, cl);
return ret;
}
INIT_WORK(&imx_sc_irq_work, imx_scu_irq_work_handler);
if (!of_parse_phandle_with_args(dev->of_node, "mboxes",
"#mbox-cells", 0, &spec))
i = of_alias_get_id(spec.np, "mu");
/* use mu1 as general mu irq channel if failed */
if (i < 0)
i = 1;
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 (sysfs_create_file(wakeup_obj, &wakeup_source_attr.attr)) {
pr_err("Cannot create sysfs file......\n");
kobject_put(wakeup_obj);
sysfs_remove_file(firmware_kobj, &wakeup_source_attr.attr);
}
return ret;
}
EXPORT_SYMBOL(imx_scu_enable_general_irq_channel);
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