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/*
* OMAP3 Pad Wakeup Handler
*
* Copyright (C) 2014-2008 Motorola, LLC.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/list.h>
#include <linux/err.h>
#include <linux/wakeup_reason.h>
#include "soc.h"
#include "common.h"
#include "mux34xx.h"
#include "prm3xxx.h"
#include "iomap.h"
#include "pad_wkup.h"
#define WAKEUPEVENT 0x8000
struct offmode_wkup {
struct list_head node;
u32 irq;
u32 pad;
u32 pad_shift;
bool handle; /* if true generate irq otherwise for debug only */
};
LIST_HEAD(offmode_wkup_list);
static void omap_register_pad_wkup(struct device *dev, u32 pad, u32 irq,
bool handle)
{
struct offmode_wkup *wkup;
pr_info("register pad (0x%04x, %u, %d)\n", pad, irq, handle);
wkup = devm_kzalloc(dev, sizeof(struct offmode_wkup), GFP_KERNEL);
if (wkup) {
wkup->irq = irq;
wkup->pad = pad & 0xFFFFFFFC;
wkup->pad_shift = pad % 4 ? 16 : 0;
wkup->handle = handle;
list_add_tail(&wkup->node, &offmode_wkup_list);
}
}
static inline int is_pad_wkup(const struct offmode_wkup *wkup)
{
int pad = __raw_readl(
OMAP2_L4_IO_ADDRESS(OMAP3_CONTROL_PADCONF_MUX_PBASE)+ wkup->pad);
pad = pad >> wkup->pad_shift;
return (pad & WAKEUPEVENT) ? 1 : 0;
}
/* prcm_handle_pad_wkup:
*
* map i/o pad wkup bits to interrupts. The primary function is
* to generate interrupts. If the handle flag is set, then generate
* interrupt. If the wkup bit is set on multiple pads, interrupts
* are generated for all. The secondary function is to log the
* Typically there should only be one wakeup event, but if there
* are multiple wakeup reasons, only the first in the list will be
* anointed "the" wakeup reason and logged. This means the order
* items are listed in the device tree will control which irq
* wins in the case of a tie.
*/
void prcm_handle_pad_wkup(void)
{
struct offmode_wkup *wkup;
int wkup_irq = -1;
list_for_each_entry(wkup, &offmode_wkup_list, node) {
if (is_pad_wkup(wkup)) {
pr_info("%s IRQ = %d\n", __func__, wkup->irq);
if (wkup_irq < 0)
wkup_irq = wkup->irq;
if (wkup->handle)
generic_handle_irq(wkup->irq);
}
}
if (wkup_irq >= 0)
log_wakeup_reason(wkup_irq);
}
#ifdef CONFIG_OMAP3_PAD_WKUP_IO
static irqreturn_t omap3_pad_wkup_handle_irq(int irq, void *unused)
{
prcm_handle_pad_wkup();
return IRQ_HANDLED;
}
#endif
static int omap3_pad_wkup_probe(struct platform_device *pdev)
{
struct device_node *node = pdev->dev.of_node;
int ndx = 0;
uint32_t pad, irq, handle;
int ret = 0;
if (!node)
return -ENODEV;
do {
if (of_property_read_u32_index(node, "ti,pad_irq", ndx, &pad))
break;
ndx++;
if (of_property_read_u32_index(node, "ti,pad_irq", ndx, &irq))
break;
ndx++;
if (of_property_read_u32_index(node, "ti,pad_irq", ndx,
&handle))
break;
ndx++;
omap_register_pad_wkup(&pdev->dev, pad, irq, handle);
} while (1);
#ifdef CONFIG_OMAP3_PAD_WKUP_IO
if (ndx > 1) {
dev_info(&pdev->dev, "request pad_wkup_io\n");
ret = request_irq(omap_prcm_event_to_irq("io"),
omap3_pad_wkup_handle_irq,
IRQF_SHARED | IRQF_NO_SUSPEND,
"pad_wkup_io", &pdev->dev);
if (ret)
pr_warning("wkup: Failed to setup pad_wkup_io irq %d\n",
ret);
}
#endif
return ret;
}
static int omap3_pad_wkup_remove(struct platform_device *pdev)
{
return 0;
}
static const struct of_device_id omap3_pad_wkup_table[] = {
{ .compatible = "ti,pad-wkup", },
{ },
};
MODULE_DEVICE_TABLE(of, omap3_pad_wkup_table);
static struct platform_driver omap3_pad_wkup_driver = {
.probe = omap3_pad_wkup_probe,
.remove = omap3_pad_wkup_remove,
.driver = {
.name = "omap3_pad_wkup",
.owner = THIS_MODULE,
.of_match_table = omap3_pad_wkup_table,
},
};
static int __init omap_pad_wkup_init(void)
{
return platform_driver_register(&omap3_pad_wkup_driver);
}
omap_late_initcall(omap_pad_wkup_init);
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