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linux/drivers/mfd/ab8500-core.c
Mattias Wallin 88aec4f7b6 mfd: Fix ab8500-core interrupt ffs bit bug 
We want to find the first set bit on value, not status.

Signed-off-by: Mattias Wallin <mattias.wallin@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
2010-12-22 12:05:22 +01:00

534 lines
12 KiB
C
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/*
* Copyright (C) ST-Ericsson SA 2010
*
* License Terms: GNU General Public License v2
* Author: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
* Author: Rabin Vincent <rabin.vincent@stericsson.com>
* Changes: Mattias Wallin <mattias.wallin@stericsson.com>
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mfd/core.h>
#include <linux/mfd/abx500.h>
#include <linux/mfd/ab8500.h>
#include <linux/regulator/ab8500.h>
/*
* Interrupt register offsets
* Bank : 0x0E
*/
#define AB8500_IT_SOURCE1_REG 0x00
#define AB8500_IT_SOURCE2_REG 0x01
#define AB8500_IT_SOURCE3_REG 0x02
#define AB8500_IT_SOURCE4_REG 0x03
#define AB8500_IT_SOURCE5_REG 0x04
#define AB8500_IT_SOURCE6_REG 0x05
#define AB8500_IT_SOURCE7_REG 0x06
#define AB8500_IT_SOURCE8_REG 0x07
#define AB8500_IT_SOURCE19_REG 0x12
#define AB8500_IT_SOURCE20_REG 0x13
#define AB8500_IT_SOURCE21_REG 0x14
#define AB8500_IT_SOURCE22_REG 0x15
#define AB8500_IT_SOURCE23_REG 0x16
#define AB8500_IT_SOURCE24_REG 0x17
/*
* latch registers
*/
#define AB8500_IT_LATCH1_REG 0x20
#define AB8500_IT_LATCH2_REG 0x21
#define AB8500_IT_LATCH3_REG 0x22
#define AB8500_IT_LATCH4_REG 0x23
#define AB8500_IT_LATCH5_REG 0x24
#define AB8500_IT_LATCH6_REG 0x25
#define AB8500_IT_LATCH7_REG 0x26
#define AB8500_IT_LATCH8_REG 0x27
#define AB8500_IT_LATCH9_REG 0x28
#define AB8500_IT_LATCH10_REG 0x29
#define AB8500_IT_LATCH19_REG 0x32
#define AB8500_IT_LATCH20_REG 0x33
#define AB8500_IT_LATCH21_REG 0x34
#define AB8500_IT_LATCH22_REG 0x35
#define AB8500_IT_LATCH23_REG 0x36
#define AB8500_IT_LATCH24_REG 0x37
/*
* mask registers
*/
#define AB8500_IT_MASK1_REG 0x40
#define AB8500_IT_MASK2_REG 0x41
#define AB8500_IT_MASK3_REG 0x42
#define AB8500_IT_MASK4_REG 0x43
#define AB8500_IT_MASK5_REG 0x44
#define AB8500_IT_MASK6_REG 0x45
#define AB8500_IT_MASK7_REG 0x46
#define AB8500_IT_MASK8_REG 0x47
#define AB8500_IT_MASK9_REG 0x48
#define AB8500_IT_MASK10_REG 0x49
#define AB8500_IT_MASK11_REG 0x4A
#define AB8500_IT_MASK12_REG 0x4B
#define AB8500_IT_MASK13_REG 0x4C
#define AB8500_IT_MASK14_REG 0x4D
#define AB8500_IT_MASK15_REG 0x4E
#define AB8500_IT_MASK16_REG 0x4F
#define AB8500_IT_MASK17_REG 0x50
#define AB8500_IT_MASK18_REG 0x51
#define AB8500_IT_MASK19_REG 0x52
#define AB8500_IT_MASK20_REG 0x53
#define AB8500_IT_MASK21_REG 0x54
#define AB8500_IT_MASK22_REG 0x55
#define AB8500_IT_MASK23_REG 0x56
#define AB8500_IT_MASK24_REG 0x57
#define AB8500_REV_REG 0x80
/*
* Map interrupt numbers to the LATCH and MASK register offsets, Interrupt
* numbers are indexed into this array with (num / 8).
*
* This is one off from the register names, i.e. AB8500_IT_MASK1_REG is at
* offset 0.
*/
static const int ab8500_irq_regoffset[AB8500_NUM_IRQ_REGS] = {
0, 1, 2, 3, 4, 6, 7, 8, 9, 18, 19, 20, 21,
};
static int ab8500_get_chip_id(struct device *dev)
{
struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
return (int)ab8500->chip_id;
}
static int set_register_interruptible(struct ab8500 *ab8500, u8 bank,
u8 reg, u8 data)
{
int ret;
/*
* Put the u8 bank and u8 register together into a an u16.
* The bank on higher 8 bits and register in lower 8 bits.
* */
u16 addr = ((u16)bank) << 8 | reg;
dev_vdbg(ab8500->dev, "wr: addr %#x <= %#x\n", addr, data);
ret = mutex_lock_interruptible(&ab8500->lock);
if (ret)
return ret;
ret = ab8500->write(ab8500, addr, data);
if (ret < 0)
dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
addr, ret);
mutex_unlock(&ab8500->lock);
return ret;
}
static int ab8500_set_register(struct device *dev, u8 bank,
u8 reg, u8 value)
{
struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
return set_register_interruptible(ab8500, bank, reg, value);
}
static int get_register_interruptible(struct ab8500 *ab8500, u8 bank,
u8 reg, u8 *value)
{
int ret;
/* put the u8 bank and u8 reg together into a an u16.
* bank on higher 8 bits and reg in lower */
u16 addr = ((u16)bank) << 8 | reg;
ret = mutex_lock_interruptible(&ab8500->lock);
if (ret)
return ret;
ret = ab8500->read(ab8500, addr);
if (ret < 0)
dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
addr, ret);
else
*value = ret;
mutex_unlock(&ab8500->lock);
dev_vdbg(ab8500->dev, "rd: addr %#x => data %#x\n", addr, ret);
return ret;
}
static int ab8500_get_register(struct device *dev, u8 bank,
u8 reg, u8 *value)
{
struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
return get_register_interruptible(ab8500, bank, reg, value);
}
static int mask_and_set_register_interruptible(struct ab8500 *ab8500, u8 bank,
u8 reg, u8 bitmask, u8 bitvalues)
{
int ret;
u8 data;
/* put the u8 bank and u8 reg together into a an u16.
* bank on higher 8 bits and reg in lower */
u16 addr = ((u16)bank) << 8 | reg;
ret = mutex_lock_interruptible(&ab8500->lock);
if (ret)
return ret;
ret = ab8500->read(ab8500, addr);
if (ret < 0) {
dev_err(ab8500->dev, "failed to read reg %#x: %d\n",
addr, ret);
goto out;
}
data = (u8)ret;
data = (~bitmask & data) | (bitmask & bitvalues);
ret = ab8500->write(ab8500, addr, data);
if (ret < 0)
dev_err(ab8500->dev, "failed to write reg %#x: %d\n",
addr, ret);
dev_vdbg(ab8500->dev, "mask: addr %#x => data %#x\n", addr, data);
out:
mutex_unlock(&ab8500->lock);
return ret;
}
static int ab8500_mask_and_set_register(struct device *dev,
u8 bank, u8 reg, u8 bitmask, u8 bitvalues)
{
struct ab8500 *ab8500 = dev_get_drvdata(dev->parent);
return mask_and_set_register_interruptible(ab8500, bank, reg,
bitmask, bitvalues);
}
static struct abx500_ops ab8500_ops = {
.get_chip_id = ab8500_get_chip_id,
.get_register = ab8500_get_register,
.set_register = ab8500_set_register,
.get_register_page = NULL,
.set_register_page = NULL,
.mask_and_set_register = ab8500_mask_and_set_register,
.event_registers_startup_state_get = NULL,
.startup_irq_enabled = NULL,
};
static void ab8500_irq_lock(unsigned int irq)
{
struct ab8500 *ab8500 = get_irq_chip_data(irq);
mutex_lock(&ab8500->irq_lock);
}
static void ab8500_irq_sync_unlock(unsigned int irq)
{
struct ab8500 *ab8500 = get_irq_chip_data(irq);
int i;
for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
u8 old = ab8500->oldmask[i];
u8 new = ab8500->mask[i];
int reg;
if (new == old)
continue;
ab8500->oldmask[i] = new;
reg = AB8500_IT_MASK1_REG + ab8500_irq_regoffset[i];
set_register_interruptible(ab8500, AB8500_INTERRUPT, reg, new);
}
mutex_unlock(&ab8500->irq_lock);
}
static void ab8500_irq_mask(unsigned int irq)
{
struct ab8500 *ab8500 = get_irq_chip_data(irq);
int offset = irq - ab8500->irq_base;
int index = offset / 8;
int mask = 1 << (offset % 8);
ab8500->mask[index] |= mask;
}
static void ab8500_irq_unmask(unsigned int irq)
{
struct ab8500 *ab8500 = get_irq_chip_data(irq);
int offset = irq - ab8500->irq_base;
int index = offset / 8;
int mask = 1 << (offset % 8);
ab8500->mask[index] &= ~mask;
}
static struct irq_chip ab8500_irq_chip = {
.name = "ab8500",
.bus_lock = ab8500_irq_lock,
.bus_sync_unlock = ab8500_irq_sync_unlock,
.mask = ab8500_irq_mask,
.unmask = ab8500_irq_unmask,
};
static irqreturn_t ab8500_irq(int irq, void *dev)
{
struct ab8500 *ab8500 = dev;
int i;
dev_vdbg(ab8500->dev, "interrupt\n");
for (i = 0; i < AB8500_NUM_IRQ_REGS; i++) {
int regoffset = ab8500_irq_regoffset[i];
int status;
u8 value;
status = get_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_LATCH1_REG + regoffset, &value);
if (status < 0 || value == 0)
continue;
do {
int bit = __ffs(value);
int line = i * 8 + bit;
handle_nested_irq(ab8500->irq_base + line);
value &= ~(1 << bit);
} while (value);
}
return IRQ_HANDLED;
}
static int ab8500_irq_init(struct ab8500 *ab8500)
{
int base = ab8500->irq_base;
int irq;
for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
set_irq_chip_data(irq, ab8500);
set_irq_chip_and_handler(irq, &ab8500_irq_chip,
handle_simple_irq);
set_irq_nested_thread(irq, 1);
#ifdef CONFIG_ARM
set_irq_flags(irq, IRQF_VALID);
#else
set_irq_noprobe(irq);
#endif
}
return 0;
}
static void ab8500_irq_remove(struct ab8500 *ab8500)
{
int base = ab8500->irq_base;
int irq;
for (irq = base; irq < base + AB8500_NR_IRQS; irq++) {
#ifdef CONFIG_ARM
set_irq_flags(irq, 0);
#endif
set_irq_chip_and_handler(irq, NULL, NULL);
set_irq_chip_data(irq, NULL);
}
}
static struct resource ab8500_gpadc_resources[] = {
{
.name = "HW_CONV_END",
.start = AB8500_INT_GP_HW_ADC_CONV_END,
.end = AB8500_INT_GP_HW_ADC_CONV_END,
.flags = IORESOURCE_IRQ,
},
{
.name = "SW_CONV_END",
.start = AB8500_INT_GP_SW_ADC_CONV_END,
.end = AB8500_INT_GP_SW_ADC_CONV_END,
.flags = IORESOURCE_IRQ,
},
};
static struct resource ab8500_rtc_resources[] = {
{
.name = "60S",
.start = AB8500_INT_RTC_60S,
.end = AB8500_INT_RTC_60S,
.flags = IORESOURCE_IRQ,
},
{
.name = "ALARM",
.start = AB8500_INT_RTC_ALARM,
.end = AB8500_INT_RTC_ALARM,
.flags = IORESOURCE_IRQ,
},
};
static struct resource ab8500_poweronkey_db_resources[] = {
{
.name = "ONKEY_DBF",
.start = AB8500_INT_PON_KEY1DB_F,
.end = AB8500_INT_PON_KEY1DB_F,
.flags = IORESOURCE_IRQ,
},
{
.name = "ONKEY_DBR",
.start = AB8500_INT_PON_KEY1DB_R,
.end = AB8500_INT_PON_KEY1DB_R,
.flags = IORESOURCE_IRQ,
},
};
static struct mfd_cell ab8500_devs[] = {
#ifdef CONFIG_DEBUG_FS
{
.name = "ab8500-debug",
},
#endif
{
.name = "ab8500-gpadc",
.num_resources = ARRAY_SIZE(ab8500_gpadc_resources),
.resources = ab8500_gpadc_resources,
},
{
.name = "ab8500-rtc",
.num_resources = ARRAY_SIZE(ab8500_rtc_resources),
.resources = ab8500_rtc_resources,
},
{
.name = "ab8500-pwm",
.id = 1,
},
{
.name = "ab8500-pwm",
.id = 2,
},
{
.name = "ab8500-pwm",
.id = 3,
},
{ .name = "ab8500-charger", },
{ .name = "ab8500-audio", },
{ .name = "ab8500-usb", },
{ .name = "ab8500-regulator", },
{
.name = "ab8500-poweron-key",
.num_resources = ARRAY_SIZE(ab8500_poweronkey_db_resources),
.resources = ab8500_poweronkey_db_resources,
},
};
int __devinit ab8500_init(struct ab8500 *ab8500)
{
struct ab8500_platform_data *plat = dev_get_platdata(ab8500->dev);
int ret;
int i;
u8 value;
if (plat)
ab8500->irq_base = plat->irq_base;
mutex_init(&ab8500->lock);
mutex_init(&ab8500->irq_lock);
ret = get_register_interruptible(ab8500, AB8500_MISC,
AB8500_REV_REG, &value);
if (ret < 0)
return ret;
/*
* 0x0 - Early Drop
* 0x10 - Cut 1.0
* 0x11 - Cut 1.1
*/
if (value == 0x0 || value == 0x10 || value == 0x11) {
ab8500->revision = value;
dev_info(ab8500->dev, "detected chip, revision: %#x\n", value);
} else {
dev_err(ab8500->dev, "unknown chip, revision: %#x\n", value);
return -EINVAL;
}
ab8500->chip_id = value;
if (plat && plat->init)
plat->init(ab8500);
/* Clear and mask all interrupts */
for (i = 0; i < 10; i++) {
get_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_LATCH1_REG + i, &value);
set_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_MASK1_REG + i, 0xff);
}
for (i = 18; i < 24; i++) {
get_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_LATCH1_REG + i, &value);
set_register_interruptible(ab8500, AB8500_INTERRUPT,
AB8500_IT_MASK1_REG + i, 0xff);
}
ret = abx500_register_ops(ab8500->dev, &ab8500_ops);
if (ret)
return ret;
for (i = 0; i < AB8500_NUM_IRQ_REGS; i++)
ab8500->mask[i] = ab8500->oldmask[i] = 0xff;
if (ab8500->irq_base) {
ret = ab8500_irq_init(ab8500);
if (ret)
return ret;
ret = request_threaded_irq(ab8500->irq, NULL, ab8500_irq,
IRQF_ONESHOT, "ab8500", ab8500);
if (ret)
goto out_removeirq;
}
ret = mfd_add_devices(ab8500->dev, 0, ab8500_devs,
ARRAY_SIZE(ab8500_devs), NULL,
ab8500->irq_base);
if (ret)
goto out_freeirq;
return ret;
out_freeirq:
if (ab8500->irq_base) {
free_irq(ab8500->irq, ab8500);
out_removeirq:
ab8500_irq_remove(ab8500);
}
return ret;
}
int __devexit ab8500_exit(struct ab8500 *ab8500)
{
mfd_remove_devices(ab8500->dev);
if (ab8500->irq_base) {
free_irq(ab8500->irq, ab8500);
ab8500_irq_remove(ab8500);
}
return 0;
}
MODULE_AUTHOR("Srinidhi Kasagar, Rabin Vincent");
MODULE_DESCRIPTION("AB8500 MFD core");
MODULE_LICENSE("GPL v2");
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