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linux/drivers/mfd/wm831x-irq.c

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/*
* wm831x-irq.c -- Interrupt controller support for Wolfson WM831x PMICs
*
* Copyright 2009 Wolfson Microelectronics PLC.
*
* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/irq.h>
#include <linux/mfd/core.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/pdata.h>
#include <linux/mfd/wm831x/gpio.h>
#include <linux/mfd/wm831x/irq.h>
#include <linux/delay.h>
struct wm831x_irq_data {
int primary;
int reg;
int mask;
};
static struct wm831x_irq_data wm831x_irqs[] = {
[WM831X_IRQ_TEMP_THW] = {
.primary = WM831X_TEMP_INT,
.reg = 1,
.mask = WM831X_TEMP_THW_EINT,
},
[WM831X_IRQ_GPIO_1] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP1_EINT,
},
[WM831X_IRQ_GPIO_2] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP2_EINT,
},
[WM831X_IRQ_GPIO_3] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP3_EINT,
},
[WM831X_IRQ_GPIO_4] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP4_EINT,
},
[WM831X_IRQ_GPIO_5] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP5_EINT,
},
[WM831X_IRQ_GPIO_6] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP6_EINT,
},
[WM831X_IRQ_GPIO_7] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP7_EINT,
},
[WM831X_IRQ_GPIO_8] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP8_EINT,
},
[WM831X_IRQ_GPIO_9] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP9_EINT,
},
[WM831X_IRQ_GPIO_10] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP10_EINT,
},
[WM831X_IRQ_GPIO_11] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP11_EINT,
},
[WM831X_IRQ_GPIO_12] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP12_EINT,
},
[WM831X_IRQ_GPIO_13] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP13_EINT,
},
[WM831X_IRQ_GPIO_14] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP14_EINT,
},
[WM831X_IRQ_GPIO_15] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP15_EINT,
},
[WM831X_IRQ_GPIO_16] = {
.primary = WM831X_GP_INT,
.reg = 5,
.mask = WM831X_GP16_EINT,
},
[WM831X_IRQ_ON] = {
.primary = WM831X_ON_PIN_INT,
.reg = 1,
.mask = WM831X_ON_PIN_EINT,
},
[WM831X_IRQ_PPM_SYSLO] = {
.primary = WM831X_PPM_INT,
.reg = 1,
.mask = WM831X_PPM_SYSLO_EINT,
},
[WM831X_IRQ_PPM_PWR_SRC] = {
.primary = WM831X_PPM_INT,
.reg = 1,
.mask = WM831X_PPM_PWR_SRC_EINT,
},
[WM831X_IRQ_PPM_USB_CURR] = {
.primary = WM831X_PPM_INT,
.reg = 1,
.mask = WM831X_PPM_USB_CURR_EINT,
},
[WM831X_IRQ_WDOG_TO] = {
.primary = WM831X_WDOG_INT,
.reg = 1,
.mask = WM831X_WDOG_TO_EINT,
},
[WM831X_IRQ_RTC_PER] = {
.primary = WM831X_RTC_INT,
.reg = 1,
.mask = WM831X_RTC_PER_EINT,
},
[WM831X_IRQ_RTC_ALM] = {
.primary = WM831X_RTC_INT,
.reg = 1,
.mask = WM831X_RTC_ALM_EINT,
},
[WM831X_IRQ_CHG_BATT_HOT] = {
.primary = WM831X_CHG_INT,
.reg = 2,
.mask = WM831X_CHG_BATT_HOT_EINT,
},
[WM831X_IRQ_CHG_BATT_COLD] = {
.primary = WM831X_CHG_INT,
.reg = 2,
.mask = WM831X_CHG_BATT_COLD_EINT,
},
[WM831X_IRQ_CHG_BATT_FAIL] = {
.primary = WM831X_CHG_INT,
.reg = 2,
.mask = WM831X_CHG_BATT_FAIL_EINT,
},
[WM831X_IRQ_CHG_OV] = {
.primary = WM831X_CHG_INT,
.reg = 2,
.mask = WM831X_CHG_OV_EINT,
},
[WM831X_IRQ_CHG_END] = {
.primary = WM831X_CHG_INT,
.reg = 2,
.mask = WM831X_CHG_END_EINT,
},
[WM831X_IRQ_CHG_TO] = {
.primary = WM831X_CHG_INT,
.reg = 2,
.mask = WM831X_CHG_TO_EINT,
},
[WM831X_IRQ_CHG_MODE] = {
.primary = WM831X_CHG_INT,
.reg = 2,
.mask = WM831X_CHG_MODE_EINT,
},
[WM831X_IRQ_CHG_START] = {
.primary = WM831X_CHG_INT,
.reg = 2,
.mask = WM831X_CHG_START_EINT,
},
[WM831X_IRQ_TCHDATA] = {
.primary = WM831X_TCHDATA_INT,
.reg = 1,
.mask = WM831X_TCHDATA_EINT,
},
[WM831X_IRQ_TCHPD] = {
.primary = WM831X_TCHPD_INT,
.reg = 1,
.mask = WM831X_TCHPD_EINT,
},
[WM831X_IRQ_AUXADC_DATA] = {
.primary = WM831X_AUXADC_INT,
.reg = 1,
.mask = WM831X_AUXADC_DATA_EINT,
},
[WM831X_IRQ_AUXADC_DCOMP1] = {
.primary = WM831X_AUXADC_INT,
.reg = 1,
.mask = WM831X_AUXADC_DCOMP1_EINT,
},
[WM831X_IRQ_AUXADC_DCOMP2] = {
.primary = WM831X_AUXADC_INT,
.reg = 1,
.mask = WM831X_AUXADC_DCOMP2_EINT,
},
[WM831X_IRQ_AUXADC_DCOMP3] = {
.primary = WM831X_AUXADC_INT,
.reg = 1,
.mask = WM831X_AUXADC_DCOMP3_EINT,
},
[WM831X_IRQ_AUXADC_DCOMP4] = {
.primary = WM831X_AUXADC_INT,
.reg = 1,
.mask = WM831X_AUXADC_DCOMP4_EINT,
},
[WM831X_IRQ_CS1] = {
.primary = WM831X_CS_INT,
.reg = 2,
.mask = WM831X_CS1_EINT,
},
[WM831X_IRQ_CS2] = {
.primary = WM831X_CS_INT,
.reg = 2,
.mask = WM831X_CS2_EINT,
},
[WM831X_IRQ_HC_DC1] = {
.primary = WM831X_HC_INT,
.reg = 4,
.mask = WM831X_HC_DC1_EINT,
},
[WM831X_IRQ_HC_DC2] = {
.primary = WM831X_HC_INT,
.reg = 4,
.mask = WM831X_HC_DC2_EINT,
},
[WM831X_IRQ_UV_LDO1] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO1_EINT,
},
[WM831X_IRQ_UV_LDO2] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO2_EINT,
},
[WM831X_IRQ_UV_LDO3] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO3_EINT,
},
[WM831X_IRQ_UV_LDO4] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO4_EINT,
},
[WM831X_IRQ_UV_LDO5] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO5_EINT,
},
[WM831X_IRQ_UV_LDO6] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO6_EINT,
},
[WM831X_IRQ_UV_LDO7] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO7_EINT,
},
[WM831X_IRQ_UV_LDO8] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO8_EINT,
},
[WM831X_IRQ_UV_LDO9] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO9_EINT,
},
[WM831X_IRQ_UV_LDO10] = {
.primary = WM831X_UV_INT,
.reg = 3,
.mask = WM831X_UV_LDO10_EINT,
},
[WM831X_IRQ_UV_DC1] = {
.primary = WM831X_UV_INT,
.reg = 4,
.mask = WM831X_UV_DC1_EINT,
},
[WM831X_IRQ_UV_DC2] = {
.primary = WM831X_UV_INT,
.reg = 4,
.mask = WM831X_UV_DC2_EINT,
},
[WM831X_IRQ_UV_DC3] = {
.primary = WM831X_UV_INT,
.reg = 4,
.mask = WM831X_UV_DC3_EINT,
},
[WM831X_IRQ_UV_DC4] = {
.primary = WM831X_UV_INT,
.reg = 4,
.mask = WM831X_UV_DC4_EINT,
},
};
static inline int irq_data_to_status_reg(struct wm831x_irq_data *irq_data)
{
return WM831X_INTERRUPT_STATUS_1 - 1 + irq_data->reg;
}
static inline struct wm831x_irq_data *irq_to_wm831x_irq(struct wm831x *wm831x,
int irq)
{
return &wm831x_irqs[irq];
}
static void wm831x_irq_lock(struct irq_data *data)
{
struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
mutex_lock(&wm831x->irq_lock);
}
static void wm831x_irq_sync_unlock(struct irq_data *data)
{
struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
int i;
for (i = 0; i < ARRAY_SIZE(wm831x->gpio_update); i++) {
if (wm831x->gpio_update[i]) {
wm831x_set_bits(wm831x, WM831X_GPIO1_CONTROL + i,
WM831X_GPN_INT_MODE | WM831X_GPN_POL,
wm831x->gpio_update[i]);
wm831x->gpio_update[i] = 0;
}
}
for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {
/* If there's been a change in the mask write it back
* to the hardware. */
if (wm831x->irq_masks_cur[i] != wm831x->irq_masks_cache[i]) {
dev_dbg(wm831x->dev, "IRQ mask sync: %x = %x\n",
WM831X_INTERRUPT_STATUS_1_MASK + i,
wm831x->irq_masks_cur[i]);
wm831x->irq_masks_cache[i] = wm831x->irq_masks_cur[i];
wm831x_reg_write(wm831x,
WM831X_INTERRUPT_STATUS_1_MASK + i,
wm831x->irq_masks_cur[i]);
}
}
mutex_unlock(&wm831x->irq_lock);
}
static void wm831x_irq_enable(struct irq_data *data)
{
struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x,
data->hwirq);
wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
}
static void wm831x_irq_disable(struct irq_data *data)
{
struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x,
data->hwirq);
wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
}
static int wm831x_irq_set_type(struct irq_data *data, unsigned int type)
{
struct wm831x *wm831x = irq_data_get_irq_chip_data(data);
int irq;
irq = data->hwirq;
if (irq < WM831X_IRQ_GPIO_1 || irq > WM831X_IRQ_GPIO_11) {
/* Ignore internal-only IRQs */
if (irq >= 0 && irq < WM831X_NUM_IRQS)
return 0;
else
return -EINVAL;
}
/* Rebase the IRQ into the GPIO range so we've got a sensible array
* index.
*/
irq -= WM831X_IRQ_GPIO_1;
/* We set the high bit to flag that we need an update; don't
* do the update here as we can be called with the bus lock
* held.
*/
wm831x->gpio_level_low[irq] = false;
wm831x->gpio_level_high[irq] = false;
switch (type) {
case IRQ_TYPE_EDGE_BOTH:
wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_INT_MODE;
break;
case IRQ_TYPE_EDGE_RISING:
wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
break;
case IRQ_TYPE_EDGE_FALLING:
wm831x->gpio_update[irq] = 0x10000;
break;
case IRQ_TYPE_LEVEL_HIGH:
wm831x->gpio_update[irq] = 0x10000 | WM831X_GPN_POL;
wm831x->gpio_level_high[irq] = true;
break;
case IRQ_TYPE_LEVEL_LOW:
wm831x->gpio_update[irq] = 0x10000;
wm831x->gpio_level_low[irq] = true;
break;
default:
return -EINVAL;
}
return 0;
}
static struct irq_chip wm831x_irq_chip = {
.name = "wm831x",
.irq_bus_lock = wm831x_irq_lock,
.irq_bus_sync_unlock = wm831x_irq_sync_unlock,
.irq_disable = wm831x_irq_disable,
.irq_enable = wm831x_irq_enable,
.irq_set_type = wm831x_irq_set_type,
};
/* The processing of the primary interrupt occurs in a thread so that
* we can interact with the device over I2C or SPI. */
static irqreturn_t wm831x_irq_thread(int irq, void *data)
{
struct wm831x *wm831x = data;
unsigned int i;
int primary, status_addr, ret;
int status_regs[WM831X_NUM_IRQ_REGS] = { 0 };
int read[WM831X_NUM_IRQ_REGS] = { 0 };
int *status;
primary = wm831x_reg_read(wm831x, WM831X_SYSTEM_INTERRUPTS);
if (primary < 0) {
dev_err(wm831x->dev, "Failed to read system interrupt: %d\n",
primary);
goto out;
}
/* The touch interrupts are visible in the primary register as
* an optimisation; open code this to avoid complicating the
* main handling loop and so we can also skip iterating the
* descriptors.
*/
if (primary & WM831X_TCHPD_INT)
handle_nested_irq(irq_find_mapping(wm831x->irq_domain,
WM831X_IRQ_TCHPD));
if (primary & WM831X_TCHDATA_INT)
handle_nested_irq(irq_find_mapping(wm831x->irq_domain,
WM831X_IRQ_TCHDATA));
primary &= ~(WM831X_TCHDATA_EINT | WM831X_TCHPD_EINT);
for (i = 0; i < ARRAY_SIZE(wm831x_irqs); i++) {
int offset = wm831x_irqs[i].reg - 1;
if (!(primary & wm831x_irqs[i].primary))
continue;
status = &status_regs[offset];
/* Hopefully there should only be one register to read
* each time otherwise we ought to do a block read. */
if (!read[offset]) {
status_addr = irq_data_to_status_reg(&wm831x_irqs[i]);
*status = wm831x_reg_read(wm831x, status_addr);
if (*status < 0) {
dev_err(wm831x->dev,
"Failed to read IRQ status: %d\n",
*status);
goto out;
}
read[offset] = 1;
/* Ignore any bits that we don't think are masked */
*status &= ~wm831x->irq_masks_cur[offset];
/* Acknowledge now so we don't miss
* notifications while we handle.
*/
wm831x_reg_write(wm831x, status_addr, *status);
}
if (*status & wm831x_irqs[i].mask)
handle_nested_irq(irq_find_mapping(wm831x->irq_domain,
i));
/* Simulate an edge triggered IRQ by polling the input
* status. This is sucky but improves interoperability.
*/
if (primary == WM831X_GP_INT &&
wm831x->gpio_level_high[i - WM831X_IRQ_GPIO_1]) {
ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
while (ret & 1 << (i - WM831X_IRQ_GPIO_1)) {
handle_nested_irq(irq_find_mapping(wm831x->irq_domain,
i));
ret = wm831x_reg_read(wm831x,
WM831X_GPIO_LEVEL);
}
}
if (primary == WM831X_GP_INT &&
wm831x->gpio_level_low[i - WM831X_IRQ_GPIO_1]) {
ret = wm831x_reg_read(wm831x, WM831X_GPIO_LEVEL);
while (!(ret & 1 << (i - WM831X_IRQ_GPIO_1))) {
handle_nested_irq(irq_find_mapping(wm831x->irq_domain,
i));
ret = wm831x_reg_read(wm831x,
WM831X_GPIO_LEVEL);
}
}
}
out:
return IRQ_HANDLED;
}
static int wm831x_irq_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
irq_set_chip_data(virq, h->host_data);
irq_set_chip_and_handler(virq, &wm831x_irq_chip, handle_edge_irq);
irq_set_nested_thread(virq, 1);
/* ARM needs us to explicitly flag the IRQ as valid
* and will set them noprobe when we do so. */
#ifdef CONFIG_ARM
set_irq_flags(virq, IRQF_VALID);
#else
irq_set_noprobe(virq);
#endif
return 0;
}
static struct irq_domain_ops wm831x_irq_domain_ops = {
.map = wm831x_irq_map,
.xlate = irq_domain_xlate_twocell,
};
int wm831x_irq_init(struct wm831x *wm831x, int irq)
{
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
struct irq_domain *domain;
int i, ret, irq_base;
mutex_init(&wm831x->irq_lock);
/* Mask the individual interrupt sources */
for (i = 0; i < ARRAY_SIZE(wm831x->irq_masks_cur); i++) {
wm831x->irq_masks_cur[i] = 0xffff;
wm831x->irq_masks_cache[i] = 0xffff;
wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1_MASK + i,
0xffff);
}
/* Try to dynamically allocate IRQs if no base is specified */
if (pdata && pdata->irq_base) {
irq_base = irq_alloc_descs(pdata->irq_base, 0,
WM831X_NUM_IRQS, 0);
if (irq_base < 0) {
dev_warn(wm831x->dev, "Failed to allocate IRQs: %d\n",
irq_base);
irq_base = 0;
}
} else {
irq_base = 0;
}
if (irq_base)
domain = irq_domain_add_legacy(wm831x->dev->of_node,
ARRAY_SIZE(wm831x_irqs),
irq_base, 0,
&wm831x_irq_domain_ops,
wm831x);
else
domain = irq_domain_add_linear(wm831x->dev->of_node,
ARRAY_SIZE(wm831x_irqs),
&wm831x_irq_domain_ops,
wm831x);
if (!domain) {
dev_warn(wm831x->dev, "Failed to allocate IRQ domain\n");
return -EINVAL;
}
if (pdata && pdata->irq_cmos)
i = 0;
else
i = WM831X_IRQ_OD;
wm831x_set_bits(wm831x, WM831X_IRQ_CONFIG,
WM831X_IRQ_OD, i);
wm831x->irq = irq;
wm831x->irq_domain = domain;
if (irq) {
/* Try to flag /IRQ as a wake source; there are a number of
* unconditional wake sources in the PMIC so this isn't
* conditional but we don't actually care *too* much if it
* fails.
*/
ret = enable_irq_wake(irq);
if (ret != 0) {
dev_warn(wm831x->dev,
"Can't enable IRQ as wake source: %d\n",
ret);
}
ret = request_threaded_irq(irq, NULL, wm831x_irq_thread,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
"wm831x", wm831x);
if (ret != 0) {
dev_err(wm831x->dev, "Failed to request IRQ %d: %d\n",
irq, ret);
return ret;
}
} else {
dev_warn(wm831x->dev,
"No interrupt specified - functionality limited\n");
}
/* Enable top level interrupts, we mask at secondary level */
wm831x_reg_write(wm831x, WM831X_SYSTEM_INTERRUPTS_MASK, 0);
return 0;
}
void wm831x_irq_exit(struct wm831x *wm831x)
{
if (wm831x->irq)
free_irq(wm831x->irq, wm831x);
}
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