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linux-2.6/drivers/mfd/wm831x-irq.c
Mark Brown 5fb4d38b19 mfd: Move WM831x to generic IRQ 
Replace the wm831x-local IRQ infrastructure with genirq, allowing access
to the diagnostic infrastructure of genirq and allowing us to implement
interrupt support for the GPIOs.  The switchover is done within the
wm831x specific IRQ API, further patches will convert the individual
drivers to use genirq directly.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2009-12-13 19:21:41 +01:00

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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/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/pdata.h>
#include <linux/mfd/wm831x/irq.h>
#include <linux/delay.h>
/*
* Since generic IRQs don't currently support interrupt controllers on
* interrupt driven buses we don't use genirq but instead provide an
* interface that looks very much like the standard ones. This leads
* to some bodges, including storing interrupt handler information in
* the static irq_data table we use to look up the data for individual
* interrupts, but hopefully won't last too long.
*/
struct wm831x_irq_data {
int primary;
int reg;
int mask;
irq_handler_t handler;
void *handler_data;
};
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 int irq_data_to_mask_reg(struct wm831x_irq_data *irq_data)
{
return WM831X_INTERRUPT_STATUS_1_MASK - 1 + irq_data->reg;
}
static inline struct wm831x_irq_data *irq_to_wm831x_irq(struct wm831x *wm831x,
int irq)
{
return &wm831x_irqs[irq - wm831x->irq_base];
}
static void wm831x_irq_lock(unsigned int irq)
{
struct wm831x *wm831x = get_irq_chip_data(irq);
mutex_lock(&wm831x->irq_lock);
}
static void wm831x_irq_sync_unlock(unsigned int irq)
{
struct wm831x *wm831x = get_irq_chip_data(irq);
int i;
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]) {
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_unmask(unsigned int irq)
{
struct wm831x *wm831x = get_irq_chip_data(irq);
struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, irq);
wm831x->irq_masks_cur[irq_data->reg - 1] &= ~irq_data->mask;
}
static void wm831x_irq_mask(unsigned int irq)
{
struct wm831x *wm831x = get_irq_chip_data(irq);
struct wm831x_irq_data *irq_data = irq_to_wm831x_irq(wm831x, irq);
wm831x->irq_masks_cur[irq_data->reg - 1] |= irq_data->mask;
}
static struct irq_chip wm831x_irq_chip = {
.name = "wm831x",
.bus_lock = wm831x_irq_lock,
.bus_sync_unlock = wm831x_irq_sync_unlock,
.mask = wm831x_irq_mask,
.unmask = wm831x_irq_unmask,
};
/* 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;
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;
}
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 = wm831x_reg_read(wm831x,
irq_data_to_status_reg(&wm831x_irqs[i]));
if (*status < 0) {
dev_err(wm831x->dev,
"Failed to read IRQ status: %d\n",
*status);
goto out;
}
read[offset] = 1;
}
/* Report it if it isn't masked, or forget the status. */
if ((*status & ~wm831x->irq_masks_cur[offset])
& wm831x_irqs[i].mask)
handle_nested_irq(wm831x->irq_base + i);
else
*status &= ~wm831x_irqs[i].mask;
}
out:
for (i = 0; i < ARRAY_SIZE(status_regs); i++) {
if (status_regs[i])
wm831x_reg_write(wm831x, WM831X_INTERRUPT_STATUS_1 + i,
status_regs[i]);
}
return IRQ_HANDLED;
}
int wm831x_irq_init(struct wm831x *wm831x, int irq)
{
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
int i, cur_irq, ret;
mutex_init(&wm831x->irq_lock);
if (!irq) {
dev_warn(wm831x->dev,
"No interrupt specified - functionality limited\n");
return 0;
}
if (!pdata || !pdata->irq_base) {
dev_err(wm831x->dev,
"No interrupt base specified, no interrupts\n");
return 0;
}
wm831x->irq = irq;
wm831x->irq_base = pdata->irq_base;
/* 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);
}
/* Register them with genirq */
for (cur_irq = wm831x->irq_base;
cur_irq < ARRAY_SIZE(wm831x_irqs) + wm831x->irq_base;
cur_irq++) {
set_irq_chip_data(cur_irq, wm831x);
set_irq_chip_and_handler(cur_irq, &wm831x_irq_chip,
handle_edge_irq);
set_irq_nested_thread(cur_irq, 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(cur_irq, IRQF_VALID);
#else
set_irq_noprobe(cur_irq);
#endif
}
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;
}
/* 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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