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linux/arch/arm/plat-omap/gpio.c
Imre Deak ea6dedd7fb ARM: OMAP: GPIO IRQ lazy IRQ disable fix 
- The current OMAP GPIO IRQ framework doesn't use the do_edge_IRQ,
  do_level_IRQ handlers, but instead calls do_simple_IRQ. This
  doesn't handle disabled interrupts properly, so drivers will
  still get interrupts after calling disable_irq. The patch solves
  this by respecting the irq_desc.disable_depth and irq_desc.running
  counters.  When one of these is non-zero the handler is not called,
  the interrupt is masked and marked as pending. The pending interrupt
  will be serviced when the running handler returns. This is according
  to the same semantics as the standard do_edge_IRQ and do_level_IRQ
  handlers have, so one day we should use them instead of do_simple_IRQ.

- Process only interrupts that are not masked. The ISR may contain
  pending interrupts that are masked these shouldn't be processed.

- Move the bank IRQ unmasking out of the IRQ dispatch loop. If there
  are further iterations we shouldn't unmask it if there are level
  triggered interrupts pending.

Signed-off-by: Imre Deak <imre.deak@nokia.com>
Signed-off-by: Juha Yrjola <juha.yrjola@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
2006-06-26 16:16:00 -07:00

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/*
* linux/arch/arm/plat-omap/gpio.c
*
* Support functions for OMAP GPIO
*
* Copyright (C) 2003-2005 Nokia Corporation
* Written by Juha Yrjölä <juha.yrjola@nokia.com>
*
* 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/config.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/sysdev.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <asm/hardware.h>
#include <asm/irq.h>
#include <asm/arch/irqs.h>
#include <asm/arch/gpio.h>
#include <asm/mach/irq.h>
#include <asm/io.h>
/*
* OMAP1510 GPIO registers
*/
#define OMAP1510_GPIO_BASE (void __iomem *)0xfffce000
#define OMAP1510_GPIO_DATA_INPUT 0x00
#define OMAP1510_GPIO_DATA_OUTPUT 0x04
#define OMAP1510_GPIO_DIR_CONTROL 0x08
#define OMAP1510_GPIO_INT_CONTROL 0x0c
#define OMAP1510_GPIO_INT_MASK 0x10
#define OMAP1510_GPIO_INT_STATUS 0x14
#define OMAP1510_GPIO_PIN_CONTROL 0x18
#define OMAP1510_IH_GPIO_BASE 64
/*
* OMAP1610 specific GPIO registers
*/
#define OMAP1610_GPIO1_BASE (void __iomem *)0xfffbe400
#define OMAP1610_GPIO2_BASE (void __iomem *)0xfffbec00
#define OMAP1610_GPIO3_BASE (void __iomem *)0xfffbb400
#define OMAP1610_GPIO4_BASE (void __iomem *)0xfffbbc00
#define OMAP1610_GPIO_REVISION 0x0000
#define OMAP1610_GPIO_SYSCONFIG 0x0010
#define OMAP1610_GPIO_SYSSTATUS 0x0014
#define OMAP1610_GPIO_IRQSTATUS1 0x0018
#define OMAP1610_GPIO_IRQENABLE1 0x001c
#define OMAP1610_GPIO_WAKEUPENABLE 0x0028
#define OMAP1610_GPIO_DATAIN 0x002c
#define OMAP1610_GPIO_DATAOUT 0x0030
#define OMAP1610_GPIO_DIRECTION 0x0034
#define OMAP1610_GPIO_EDGE_CTRL1 0x0038
#define OMAP1610_GPIO_EDGE_CTRL2 0x003c
#define OMAP1610_GPIO_CLEAR_IRQENABLE1 0x009c
#define OMAP1610_GPIO_CLEAR_WAKEUPENA 0x00a8
#define OMAP1610_GPIO_CLEAR_DATAOUT 0x00b0
#define OMAP1610_GPIO_SET_IRQENABLE1 0x00dc
#define OMAP1610_GPIO_SET_WAKEUPENA 0x00e8
#define OMAP1610_GPIO_SET_DATAOUT 0x00f0
/*
* OMAP730 specific GPIO registers
*/
#define OMAP730_GPIO1_BASE (void __iomem *)0xfffbc000
#define OMAP730_GPIO2_BASE (void __iomem *)0xfffbc800
#define OMAP730_GPIO3_BASE (void __iomem *)0xfffbd000
#define OMAP730_GPIO4_BASE (void __iomem *)0xfffbd800
#define OMAP730_GPIO5_BASE (void __iomem *)0xfffbe000
#define OMAP730_GPIO6_BASE (void __iomem *)0xfffbe800
#define OMAP730_GPIO_DATA_INPUT 0x00
#define OMAP730_GPIO_DATA_OUTPUT 0x04
#define OMAP730_GPIO_DIR_CONTROL 0x08
#define OMAP730_GPIO_INT_CONTROL 0x0c
#define OMAP730_GPIO_INT_MASK 0x10
#define OMAP730_GPIO_INT_STATUS 0x14
/*
* omap24xx specific GPIO registers
*/
#define OMAP24XX_GPIO1_BASE (void __iomem *)0x48018000
#define OMAP24XX_GPIO2_BASE (void __iomem *)0x4801a000
#define OMAP24XX_GPIO3_BASE (void __iomem *)0x4801c000
#define OMAP24XX_GPIO4_BASE (void __iomem *)0x4801e000
#define OMAP24XX_GPIO_REVISION 0x0000
#define OMAP24XX_GPIO_SYSCONFIG 0x0010
#define OMAP24XX_GPIO_SYSSTATUS 0x0014
#define OMAP24XX_GPIO_IRQSTATUS1 0x0018
#define OMAP24XX_GPIO_IRQENABLE1 0x001c
#define OMAP24XX_GPIO_CTRL 0x0030
#define OMAP24XX_GPIO_OE 0x0034
#define OMAP24XX_GPIO_DATAIN 0x0038
#define OMAP24XX_GPIO_DATAOUT 0x003c
#define OMAP24XX_GPIO_LEVELDETECT0 0x0040
#define OMAP24XX_GPIO_LEVELDETECT1 0x0044
#define OMAP24XX_GPIO_RISINGDETECT 0x0048
#define OMAP24XX_GPIO_FALLINGDETECT 0x004c
#define OMAP24XX_GPIO_CLEARIRQENABLE1 0x0060
#define OMAP24XX_GPIO_SETIRQENABLE1 0x0064
#define OMAP24XX_GPIO_CLEARWKUENA 0x0080
#define OMAP24XX_GPIO_SETWKUENA 0x0084
#define OMAP24XX_GPIO_CLEARDATAOUT 0x0090
#define OMAP24XX_GPIO_SETDATAOUT 0x0094
#define OMAP_MPUIO_MASK (~OMAP_MAX_GPIO_LINES & 0xff)
struct gpio_bank {
void __iomem *base;
u16 irq;
u16 virtual_irq_start;
int method;
u32 reserved_map;
u32 suspend_wakeup;
u32 saved_wakeup;
spinlock_t lock;
};
#define METHOD_MPUIO 0
#define METHOD_GPIO_1510 1
#define METHOD_GPIO_1610 2
#define METHOD_GPIO_730 3
#define METHOD_GPIO_24XX 4
#ifdef CONFIG_ARCH_OMAP16XX
static struct gpio_bank gpio_bank_1610[5] = {
{ OMAP_MPUIO_BASE, INT_MPUIO, IH_MPUIO_BASE, METHOD_MPUIO},
{ OMAP1610_GPIO1_BASE, INT_GPIO_BANK1, IH_GPIO_BASE, METHOD_GPIO_1610 },
{ OMAP1610_GPIO2_BASE, INT_1610_GPIO_BANK2, IH_GPIO_BASE + 16, METHOD_GPIO_1610 },
{ OMAP1610_GPIO3_BASE, INT_1610_GPIO_BANK3, IH_GPIO_BASE + 32, METHOD_GPIO_1610 },
{ OMAP1610_GPIO4_BASE, INT_1610_GPIO_BANK4, IH_GPIO_BASE + 48, METHOD_GPIO_1610 },
};
#endif
#ifdef CONFIG_ARCH_OMAP15XX
static struct gpio_bank gpio_bank_1510[2] = {
{ OMAP_MPUIO_BASE, INT_MPUIO, IH_MPUIO_BASE, METHOD_MPUIO },
{ OMAP1510_GPIO_BASE, INT_GPIO_BANK1, IH_GPIO_BASE, METHOD_GPIO_1510 }
};
#endif
#ifdef CONFIG_ARCH_OMAP730
static struct gpio_bank gpio_bank_730[7] = {
{ OMAP_MPUIO_BASE, INT_730_MPUIO, IH_MPUIO_BASE, METHOD_MPUIO },
{ OMAP730_GPIO1_BASE, INT_730_GPIO_BANK1, IH_GPIO_BASE, METHOD_GPIO_730 },
{ OMAP730_GPIO2_BASE, INT_730_GPIO_BANK2, IH_GPIO_BASE + 32, METHOD_GPIO_730 },
{ OMAP730_GPIO3_BASE, INT_730_GPIO_BANK3, IH_GPIO_BASE + 64, METHOD_GPIO_730 },
{ OMAP730_GPIO4_BASE, INT_730_GPIO_BANK4, IH_GPIO_BASE + 96, METHOD_GPIO_730 },
{ OMAP730_GPIO5_BASE, INT_730_GPIO_BANK5, IH_GPIO_BASE + 128, METHOD_GPIO_730 },
{ OMAP730_GPIO6_BASE, INT_730_GPIO_BANK6, IH_GPIO_BASE + 160, METHOD_GPIO_730 },
};
#endif
#ifdef CONFIG_ARCH_OMAP24XX
static struct gpio_bank gpio_bank_24xx[4] = {
{ OMAP24XX_GPIO1_BASE, INT_24XX_GPIO_BANK1, IH_GPIO_BASE, METHOD_GPIO_24XX },
{ OMAP24XX_GPIO2_BASE, INT_24XX_GPIO_BANK2, IH_GPIO_BASE + 32, METHOD_GPIO_24XX },
{ OMAP24XX_GPIO3_BASE, INT_24XX_GPIO_BANK3, IH_GPIO_BASE + 64, METHOD_GPIO_24XX },
{ OMAP24XX_GPIO4_BASE, INT_24XX_GPIO_BANK4, IH_GPIO_BASE + 96, METHOD_GPIO_24XX },
};
#endif
static struct gpio_bank *gpio_bank;
static int gpio_bank_count;
static inline struct gpio_bank *get_gpio_bank(int gpio)
{
#ifdef CONFIG_ARCH_OMAP15XX
if (cpu_is_omap15xx()) {
if (OMAP_GPIO_IS_MPUIO(gpio))
return &gpio_bank[0];
return &gpio_bank[1];
}
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
if (cpu_is_omap16xx()) {
if (OMAP_GPIO_IS_MPUIO(gpio))
return &gpio_bank[0];
return &gpio_bank[1 + (gpio >> 4)];
}
#endif
#ifdef CONFIG_ARCH_OMAP730
if (cpu_is_omap730()) {
if (OMAP_GPIO_IS_MPUIO(gpio))
return &gpio_bank[0];
return &gpio_bank[1 + (gpio >> 5)];
}
#endif
#ifdef CONFIG_ARCH_OMAP24XX
if (cpu_is_omap24xx())
return &gpio_bank[gpio >> 5];
#endif
}
static inline int get_gpio_index(int gpio)
{
#ifdef CONFIG_ARCH_OMAP730
if (cpu_is_omap730())
return gpio & 0x1f;
#endif
#ifdef CONFIG_ARCH_OMAP24XX
if (cpu_is_omap24xx())
return gpio & 0x1f;
#endif
return gpio & 0x0f;
}
static inline int gpio_valid(int gpio)
{
if (gpio < 0)
return -1;
if (OMAP_GPIO_IS_MPUIO(gpio)) {
if ((gpio & OMAP_MPUIO_MASK) > 16)
return -1;
return 0;
}
#ifdef CONFIG_ARCH_OMAP15XX
if (cpu_is_omap15xx() && gpio < 16)
return 0;
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
if ((cpu_is_omap16xx()) && gpio < 64)
return 0;
#endif
#ifdef CONFIG_ARCH_OMAP730
if (cpu_is_omap730() && gpio < 192)
return 0;
#endif
#ifdef CONFIG_ARCH_OMAP24XX
if (cpu_is_omap24xx() && gpio < 128)
return 0;
#endif
return -1;
}
static int check_gpio(int gpio)
{
if (unlikely(gpio_valid(gpio)) < 0) {
printk(KERN_ERR "omap-gpio: invalid GPIO %d\n", gpio);
dump_stack();
return -1;
}
return 0;
}
static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
{
void __iomem *reg = bank->base;
u32 l;
switch (bank->method) {
case METHOD_MPUIO:
reg += OMAP_MPUIO_IO_CNTL;
break;
case METHOD_GPIO_1510:
reg += OMAP1510_GPIO_DIR_CONTROL;
break;
case METHOD_GPIO_1610:
reg += OMAP1610_GPIO_DIRECTION;
break;
case METHOD_GPIO_730:
reg += OMAP730_GPIO_DIR_CONTROL;
break;
case METHOD_GPIO_24XX:
reg += OMAP24XX_GPIO_OE;
break;
}
l = __raw_readl(reg);
if (is_input)
l |= 1 << gpio;
else
l &= ~(1 << gpio);
__raw_writel(l, reg);
}
void omap_set_gpio_direction(int gpio, int is_input)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
spin_lock(&bank->lock);
_set_gpio_direction(bank, get_gpio_index(gpio), is_input);
spin_unlock(&bank->lock);
}
static void _set_gpio_dataout(struct gpio_bank *bank, int gpio, int enable)
{
void __iomem *reg = bank->base;
u32 l = 0;
switch (bank->method) {
case METHOD_MPUIO:
reg += OMAP_MPUIO_OUTPUT;
l = __raw_readl(reg);
if (enable)
l |= 1 << gpio;
else
l &= ~(1 << gpio);
break;
case METHOD_GPIO_1510:
reg += OMAP1510_GPIO_DATA_OUTPUT;
l = __raw_readl(reg);
if (enable)
l |= 1 << gpio;
else
l &= ~(1 << gpio);
break;
case METHOD_GPIO_1610:
if (enable)
reg += OMAP1610_GPIO_SET_DATAOUT;
else
reg += OMAP1610_GPIO_CLEAR_DATAOUT;
l = 1 << gpio;
break;
case METHOD_GPIO_730:
reg += OMAP730_GPIO_DATA_OUTPUT;
l = __raw_readl(reg);
if (enable)
l |= 1 << gpio;
else
l &= ~(1 << gpio);
break;
case METHOD_GPIO_24XX:
if (enable)
reg += OMAP24XX_GPIO_SETDATAOUT;
else
reg += OMAP24XX_GPIO_CLEARDATAOUT;
l = 1 << gpio;
break;
default:
BUG();
return;
}
__raw_writel(l, reg);
}
void omap_set_gpio_dataout(int gpio, int enable)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
spin_lock(&bank->lock);
_set_gpio_dataout(bank, get_gpio_index(gpio), enable);
spin_unlock(&bank->lock);
}
int omap_get_gpio_datain(int gpio)
{
struct gpio_bank *bank;
void __iomem *reg;
if (check_gpio(gpio) < 0)
return -1;
bank = get_gpio_bank(gpio);
reg = bank->base;
switch (bank->method) {
case METHOD_MPUIO:
reg += OMAP_MPUIO_INPUT_LATCH;
break;
case METHOD_GPIO_1510:
reg += OMAP1510_GPIO_DATA_INPUT;
break;
case METHOD_GPIO_1610:
reg += OMAP1610_GPIO_DATAIN;
break;
case METHOD_GPIO_730:
reg += OMAP730_GPIO_DATA_INPUT;
break;
case METHOD_GPIO_24XX:
reg += OMAP24XX_GPIO_DATAIN;
break;
default:
BUG();
return -1;
}
return (__raw_readl(reg)
& (1 << get_gpio_index(gpio))) != 0;
}
#define MOD_REG_BIT(reg, bit_mask, set) \
do { \
int l = __raw_readl(base + reg); \
if (set) l |= bit_mask; \
else l &= ~bit_mask; \
__raw_writel(l, base + reg); \
} while(0)
static inline void set_24xx_gpio_triggering(void __iomem *base, int gpio, int trigger)
{
u32 gpio_bit = 1 << gpio;
MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT0, gpio_bit,
trigger & __IRQT_LOWLVL);
MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT1, gpio_bit,
trigger & __IRQT_HIGHLVL);
MOD_REG_BIT(OMAP24XX_GPIO_RISINGDETECT, gpio_bit,
trigger & __IRQT_RISEDGE);
MOD_REG_BIT(OMAP24XX_GPIO_FALLINGDETECT, gpio_bit,
trigger & __IRQT_FALEDGE);
/* FIXME: Possibly do 'set_irq_handler(j, do_level_IRQ)' if only level
* triggering requested. */
}
static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger)
{
void __iomem *reg = bank->base;
u32 l = 0;
switch (bank->method) {
case METHOD_MPUIO:
reg += OMAP_MPUIO_GPIO_INT_EDGE;
l = __raw_readl(reg);
if (trigger & __IRQT_RISEDGE)
l |= 1 << gpio;
else if (trigger & __IRQT_FALEDGE)
l &= ~(1 << gpio);
else
goto bad;
break;
case METHOD_GPIO_1510:
reg += OMAP1510_GPIO_INT_CONTROL;
l = __raw_readl(reg);
if (trigger & __IRQT_RISEDGE)
l |= 1 << gpio;
else if (trigger & __IRQT_FALEDGE)
l &= ~(1 << gpio);
else
goto bad;
break;
case METHOD_GPIO_1610:
if (gpio & 0x08)
reg += OMAP1610_GPIO_EDGE_CTRL2;
else
reg += OMAP1610_GPIO_EDGE_CTRL1;
gpio &= 0x07;
/* We allow only edge triggering, i.e. two lowest bits */
if (trigger & (__IRQT_LOWLVL | __IRQT_HIGHLVL))
BUG();
l = __raw_readl(reg);
l &= ~(3 << (gpio << 1));
if (trigger & __IRQT_RISEDGE)
l |= 2 << (gpio << 1);
if (trigger & __IRQT_FALEDGE)
l |= 1 << (gpio << 1);
break;
case METHOD_GPIO_730:
reg += OMAP730_GPIO_INT_CONTROL;
l = __raw_readl(reg);
if (trigger & __IRQT_RISEDGE)
l |= 1 << gpio;
else if (trigger & __IRQT_FALEDGE)
l &= ~(1 << gpio);
else
goto bad;
break;
case METHOD_GPIO_24XX:
set_24xx_gpio_triggering(reg, gpio, trigger);
break;
default:
BUG();
goto bad;
}
__raw_writel(l, reg);
return 0;
bad:
return -EINVAL;
}
static int gpio_irq_type(unsigned irq, unsigned type)
{
struct gpio_bank *bank;
unsigned gpio;
int retval;
if (irq > IH_MPUIO_BASE)
gpio = OMAP_MPUIO(irq - IH_MPUIO_BASE);
else
gpio = irq - IH_GPIO_BASE;
if (check_gpio(gpio) < 0)
return -EINVAL;
if (type & IRQT_PROBE)
return -EINVAL;
if (!cpu_is_omap24xx() && (type & (__IRQT_LOWLVL|__IRQT_HIGHLVL)))
return -EINVAL;
bank = get_gpio_bank(gpio);
spin_lock(&bank->lock);
retval = _set_gpio_triggering(bank, get_gpio_index(gpio), type);
spin_unlock(&bank->lock);
return retval;
}
static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
{
void __iomem *reg = bank->base;
switch (bank->method) {
case METHOD_MPUIO:
/* MPUIO irqstatus is reset by reading the status register,
* so do nothing here */
return;
case METHOD_GPIO_1510:
reg += OMAP1510_GPIO_INT_STATUS;
break;
case METHOD_GPIO_1610:
reg += OMAP1610_GPIO_IRQSTATUS1;
break;
case METHOD_GPIO_730:
reg += OMAP730_GPIO_INT_STATUS;
break;
case METHOD_GPIO_24XX:
reg += OMAP24XX_GPIO_IRQSTATUS1;
break;
default:
BUG();
return;
}
__raw_writel(gpio_mask, reg);
}
static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
{
_clear_gpio_irqbank(bank, 1 << get_gpio_index(gpio));
}
static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
{
void __iomem *reg = bank->base;
switch (bank->method) {
case METHOD_MPUIO:
reg += OMAP_MPUIO_GPIO_MASKIT;
break;
case METHOD_GPIO_1510:
reg += OMAP1510_GPIO_INT_MASK;
break;
case METHOD_GPIO_1610:
reg += OMAP1610_GPIO_IRQENABLE1;
break;
case METHOD_GPIO_730:
reg += OMAP730_GPIO_INT_MASK;
break;
case METHOD_GPIO_24XX:
reg += OMAP24XX_GPIO_IRQENABLE1;
break;
default:
BUG();
return 0;
}
return __raw_readl(reg);
}
static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask, int enable)
{
void __iomem *reg = bank->base;
u32 l;
switch (bank->method) {
case METHOD_MPUIO:
reg += OMAP_MPUIO_GPIO_MASKIT;
l = __raw_readl(reg);
if (enable)
l &= ~(gpio_mask);
else
l |= gpio_mask;
break;
case METHOD_GPIO_1510:
reg += OMAP1510_GPIO_INT_MASK;
l = __raw_readl(reg);
if (enable)
l &= ~(gpio_mask);
else
l |= gpio_mask;
break;
case METHOD_GPIO_1610:
if (enable)
reg += OMAP1610_GPIO_SET_IRQENABLE1;
else
reg += OMAP1610_GPIO_CLEAR_IRQENABLE1;
l = gpio_mask;
break;
case METHOD_GPIO_730:
reg += OMAP730_GPIO_INT_MASK;
l = __raw_readl(reg);
if (enable)
l &= ~(gpio_mask);
else
l |= gpio_mask;
break;
case METHOD_GPIO_24XX:
if (enable)
reg += OMAP24XX_GPIO_SETIRQENABLE1;
else
reg += OMAP24XX_GPIO_CLEARIRQENABLE1;
l = gpio_mask;
break;
default:
BUG();
return;
}
__raw_writel(l, reg);
}
static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
{
_enable_gpio_irqbank(bank, 1 << get_gpio_index(gpio), enable);
}
/*
* Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
* 1510 does not seem to have a wake-up register. If JTAG is connected
* to the target, system will wake up always on GPIO events. While
* system is running all registered GPIO interrupts need to have wake-up
* enabled. When system is suspended, only selected GPIO interrupts need
* to have wake-up enabled.
*/
static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
{
switch (bank->method) {
case METHOD_GPIO_1610:
case METHOD_GPIO_24XX:
spin_lock(&bank->lock);
if (enable)
bank->suspend_wakeup |= (1 << gpio);
else
bank->suspend_wakeup &= ~(1 << gpio);
spin_unlock(&bank->lock);
return 0;
default:
printk(KERN_ERR "Can't enable GPIO wakeup for method %i\n",
bank->method);
return -EINVAL;
}
}
/* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
static int gpio_wake_enable(unsigned int irq, unsigned int enable)
{
unsigned int gpio = irq - IH_GPIO_BASE;
struct gpio_bank *bank;
int retval;
if (check_gpio(gpio) < 0)
return -ENODEV;
bank = get_gpio_bank(gpio);
spin_lock(&bank->lock);
retval = _set_gpio_wakeup(bank, get_gpio_index(gpio), enable);
spin_unlock(&bank->lock);
return retval;
}
int omap_request_gpio(int gpio)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return -EINVAL;
bank = get_gpio_bank(gpio);
spin_lock(&bank->lock);
if (unlikely(bank->reserved_map & (1 << get_gpio_index(gpio)))) {
printk(KERN_ERR "omap-gpio: GPIO %d is already reserved!\n", gpio);
dump_stack();
spin_unlock(&bank->lock);
return -1;
}
bank->reserved_map |= (1 << get_gpio_index(gpio));
/* Set trigger to none. You need to enable the trigger after request_irq */
_set_gpio_triggering(bank, get_gpio_index(gpio), IRQT_NOEDGE);
#ifdef CONFIG_ARCH_OMAP15XX
if (bank->method == METHOD_GPIO_1510) {
void __iomem *reg;
/* Claim the pin for MPU */
reg = bank->base + OMAP1510_GPIO_PIN_CONTROL;
__raw_writel(__raw_readl(reg) | (1 << get_gpio_index(gpio)), reg);
}
#endif
#ifdef CONFIG_ARCH_OMAP16XX
if (bank->method == METHOD_GPIO_1610) {
/* Enable wake-up during idle for dynamic tick */
void __iomem *reg = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
__raw_writel(1 << get_gpio_index(gpio), reg);
}
#endif
#ifdef CONFIG_ARCH_OMAP24XX
if (bank->method == METHOD_GPIO_24XX) {
/* Enable wake-up during idle for dynamic tick */
void __iomem *reg = bank->base + OMAP24XX_GPIO_SETWKUENA;
__raw_writel(1 << get_gpio_index(gpio), reg);
}
#endif
spin_unlock(&bank->lock);
return 0;
}
void omap_free_gpio(int gpio)
{
struct gpio_bank *bank;
if (check_gpio(gpio) < 0)
return;
bank = get_gpio_bank(gpio);
spin_lock(&bank->lock);
if (unlikely(!(bank->reserved_map & (1 << get_gpio_index(gpio))))) {
printk(KERN_ERR "omap-gpio: GPIO %d wasn't reserved!\n", gpio);
dump_stack();
spin_unlock(&bank->lock);
return;
}
#ifdef CONFIG_ARCH_OMAP16XX
if (bank->method == METHOD_GPIO_1610) {
/* Disable wake-up during idle for dynamic tick */
void __iomem *reg = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
__raw_writel(1 << get_gpio_index(gpio), reg);
}
#endif
#ifdef CONFIG_ARCH_OMAP24XX
if (bank->method == METHOD_GPIO_24XX) {
/* Disable wake-up during idle for dynamic tick */
void __iomem *reg = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
__raw_writel(1 << get_gpio_index(gpio), reg);
}
#endif
bank->reserved_map &= ~(1 << get_gpio_index(gpio));
_set_gpio_direction(bank, get_gpio_index(gpio), 1);
_set_gpio_irqenable(bank, gpio, 0);
_clear_gpio_irqstatus(bank, gpio);
spin_unlock(&bank->lock);
}
/*
* We need to unmask the GPIO bank interrupt as soon as possible to
* avoid missing GPIO interrupts for other lines in the bank.
* Then we need to mask-read-clear-unmask the triggered GPIO lines
* in the bank to avoid missing nested interrupts for a GPIO line.
* If we wait to unmask individual GPIO lines in the bank after the
* line's interrupt handler has been run, we may miss some nested
* interrupts.
*/
static void gpio_irq_handler(unsigned int irq, struct irqdesc *desc,
struct pt_regs *regs)
{
void __iomem *isr_reg = NULL;
u32 isr;
unsigned int gpio_irq;
struct gpio_bank *bank;
u32 retrigger = 0;
int unmasked = 0;
desc->chip->ack(irq);
bank = (struct gpio_bank *) desc->data;
if (bank->method == METHOD_MPUIO)
isr_reg = bank->base + OMAP_MPUIO_GPIO_INT;
#ifdef CONFIG_ARCH_OMAP15XX
if (bank->method == METHOD_GPIO_1510)
isr_reg = bank->base + OMAP1510_GPIO_INT_STATUS;
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
if (bank->method == METHOD_GPIO_1610)
isr_reg = bank->base + OMAP1610_GPIO_IRQSTATUS1;
#endif
#ifdef CONFIG_ARCH_OMAP730
if (bank->method == METHOD_GPIO_730)
isr_reg = bank->base + OMAP730_GPIO_INT_STATUS;
#endif
#ifdef CONFIG_ARCH_OMAP24XX
if (bank->method == METHOD_GPIO_24XX)
isr_reg = bank->base + OMAP24XX_GPIO_IRQSTATUS1;
#endif
while(1) {
u32 isr_saved, level_mask = 0;
u32 enabled;
enabled = _get_gpio_irqbank_mask(bank);
isr_saved = isr = __raw_readl(isr_reg) & enabled;
if (cpu_is_omap15xx() && (bank->method == METHOD_MPUIO))
isr &= 0x0000ffff;
if (cpu_is_omap24xx()) {
level_mask =
__raw_readl(bank->base +
OMAP24XX_GPIO_LEVELDETECT0) |
__raw_readl(bank->base +
OMAP24XX_GPIO_LEVELDETECT1);
level_mask &= enabled;
}
/* clear edge sensitive interrupts before handler(s) are
called so that we don't miss any interrupt occurred while
executing them */
_enable_gpio_irqbank(bank, isr_saved & ~level_mask, 0);
_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
_enable_gpio_irqbank(bank, isr_saved & ~level_mask, 1);
/* if there is only edge sensitive GPIO pin interrupts
configured, we could unmask GPIO bank interrupt immediately */
if (!level_mask && !unmasked) {
unmasked = 1;
desc->chip->unmask(irq);
}
isr |= retrigger;
retrigger = 0;
if (!isr)
break;
gpio_irq = bank->virtual_irq_start;
for (; isr != 0; isr >>= 1, gpio_irq++) {
struct irqdesc *d;
int irq_mask;
if (!(isr & 1))
continue;
d = irq_desc + gpio_irq;
/* Don't run the handler if it's already running
* or was disabled lazely.
*/
if (unlikely((d->disable_depth || d->running))) {
irq_mask = 1 <<
(gpio_irq - bank->virtual_irq_start);
/* The unmasking will be done by
* enable_irq in case it is disabled or
* after returning from the handler if
* it's already running.
*/
_enable_gpio_irqbank(bank, irq_mask, 0);
if (!d->disable_depth) {
/* Level triggered interrupts
* won't ever be reentered
*/
BUG_ON(level_mask & irq_mask);
d->pending = 1;
}
continue;
}
d->running = 1;
desc_handle_irq(gpio_irq, d, regs);
d->running = 0;
if (unlikely(d->pending && !d->disable_depth)) {
irq_mask = 1 <<
(gpio_irq - bank->virtual_irq_start);
d->pending = 0;
_enable_gpio_irqbank(bank, irq_mask, 1);
retrigger |= irq_mask;
}
}
if (cpu_is_omap24xx()) {
/* clear level sensitive interrupts after handler(s) */
_enable_gpio_irqbank(bank, isr_saved & level_mask, 0);
_clear_gpio_irqbank(bank, isr_saved & level_mask);
_enable_gpio_irqbank(bank, isr_saved & level_mask, 1);
}
}
/* if bank has any level sensitive GPIO pin interrupt
configured, we must unmask the bank interrupt only after
handler(s) are executed in order to avoid spurious bank
interrupt */
if (!unmasked)
desc->chip->unmask(irq);
}
static void gpio_ack_irq(unsigned int irq)
{
unsigned int gpio = irq - IH_GPIO_BASE;
struct gpio_bank *bank = get_gpio_bank(gpio);
_clear_gpio_irqstatus(bank, gpio);
}
static void gpio_mask_irq(unsigned int irq)
{
unsigned int gpio = irq - IH_GPIO_BASE;
struct gpio_bank *bank = get_gpio_bank(gpio);
_set_gpio_irqenable(bank, gpio, 0);
}
static void gpio_unmask_irq(unsigned int irq)
{
unsigned int gpio = irq - IH_GPIO_BASE;
unsigned int gpio_idx = get_gpio_index(gpio);
struct gpio_bank *bank = get_gpio_bank(gpio);
_set_gpio_irqenable(bank, gpio_idx, 1);
}
static void mpuio_ack_irq(unsigned int irq)
{
/* The ISR is reset automatically, so do nothing here. */
}
static void mpuio_mask_irq(unsigned int irq)
{
unsigned int gpio = OMAP_MPUIO(irq - IH_MPUIO_BASE);
struct gpio_bank *bank = get_gpio_bank(gpio);
_set_gpio_irqenable(bank, gpio, 0);
}
static void mpuio_unmask_irq(unsigned int irq)
{
unsigned int gpio = OMAP_MPUIO(irq - IH_MPUIO_BASE);
struct gpio_bank *bank = get_gpio_bank(gpio);
_set_gpio_irqenable(bank, gpio, 1);
}
static struct irqchip gpio_irq_chip = {
.ack = gpio_ack_irq,
.mask = gpio_mask_irq,
.unmask = gpio_unmask_irq,
.set_type = gpio_irq_type,
.set_wake = gpio_wake_enable,
};
static struct irqchip mpuio_irq_chip = {
.ack = mpuio_ack_irq,
.mask = mpuio_mask_irq,
.unmask = mpuio_unmask_irq
};
static int initialized;
static struct clk * gpio_ick;
static struct clk * gpio_fck;
static int __init _omap_gpio_init(void)
{
int i;
struct gpio_bank *bank;
initialized = 1;
if (cpu_is_omap15xx()) {
gpio_ick = clk_get(NULL, "arm_gpio_ck");
if (IS_ERR(gpio_ick))
printk("Could not get arm_gpio_ck\n");
else
clk_enable(gpio_ick);
}
if (cpu_is_omap24xx()) {
gpio_ick = clk_get(NULL, "gpios_ick");
if (IS_ERR(gpio_ick))
printk("Could not get gpios_ick\n");
else
clk_enable(gpio_ick);
gpio_fck = clk_get(NULL, "gpios_fck");
if (IS_ERR(gpio_ick))
printk("Could not get gpios_fck\n");
else
clk_enable(gpio_fck);
}
#ifdef CONFIG_ARCH_OMAP15XX
if (cpu_is_omap15xx()) {
printk(KERN_INFO "OMAP1510 GPIO hardware\n");
gpio_bank_count = 2;
gpio_bank = gpio_bank_1510;
}
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
if (cpu_is_omap16xx()) {
u32 rev;
gpio_bank_count = 5;
gpio_bank = gpio_bank_1610;
rev = omap_readw(gpio_bank[1].base + OMAP1610_GPIO_REVISION);
printk(KERN_INFO "OMAP GPIO hardware version %d.%d\n",
(rev >> 4) & 0x0f, rev & 0x0f);
}
#endif
#ifdef CONFIG_ARCH_OMAP730
if (cpu_is_omap730()) {
printk(KERN_INFO "OMAP730 GPIO hardware\n");
gpio_bank_count = 7;
gpio_bank = gpio_bank_730;
}
#endif
#ifdef CONFIG_ARCH_OMAP24XX
if (cpu_is_omap24xx()) {
int rev;
gpio_bank_count = 4;
gpio_bank = gpio_bank_24xx;
rev = omap_readl(gpio_bank[0].base + OMAP24XX_GPIO_REVISION);
printk(KERN_INFO "OMAP24xx GPIO hardware version %d.%d\n",
(rev >> 4) & 0x0f, rev & 0x0f);
}
#endif
for (i = 0; i < gpio_bank_count; i++) {
int j, gpio_count = 16;
bank = &gpio_bank[i];
bank->reserved_map = 0;
bank->base = IO_ADDRESS(bank->base);
spin_lock_init(&bank->lock);
if (bank->method == METHOD_MPUIO) {
omap_writew(0xFFFF, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_MASKIT);
}
#ifdef CONFIG_ARCH_OMAP15XX
if (bank->method == METHOD_GPIO_1510) {
__raw_writew(0xffff, bank->base + OMAP1510_GPIO_INT_MASK);
__raw_writew(0x0000, bank->base + OMAP1510_GPIO_INT_STATUS);
}
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
if (bank->method == METHOD_GPIO_1610) {
__raw_writew(0x0000, bank->base + OMAP1610_GPIO_IRQENABLE1);
__raw_writew(0xffff, bank->base + OMAP1610_GPIO_IRQSTATUS1);
__raw_writew(0x0014, bank->base + OMAP1610_GPIO_SYSCONFIG);
}
#endif
#ifdef CONFIG_ARCH_OMAP730
if (bank->method == METHOD_GPIO_730) {
__raw_writel(0xffffffff, bank->base + OMAP730_GPIO_INT_MASK);
__raw_writel(0x00000000, bank->base + OMAP730_GPIO_INT_STATUS);
gpio_count = 32; /* 730 has 32-bit GPIOs */
}
#endif
#ifdef CONFIG_ARCH_OMAP24XX
if (bank->method == METHOD_GPIO_24XX) {
__raw_writel(0x00000000, bank->base + OMAP24XX_GPIO_IRQENABLE1);
__raw_writel(0xffffffff, bank->base + OMAP24XX_GPIO_IRQSTATUS1);
gpio_count = 32;
}
#endif
for (j = bank->virtual_irq_start;
j < bank->virtual_irq_start + gpio_count; j++) {
if (bank->method == METHOD_MPUIO)
set_irq_chip(j, &mpuio_irq_chip);
else
set_irq_chip(j, &gpio_irq_chip);
set_irq_handler(j, do_simple_IRQ);
set_irq_flags(j, IRQF_VALID);
}
set_irq_chained_handler(bank->irq, gpio_irq_handler);
set_irq_data(bank->irq, bank);
}
/* Enable system clock for GPIO module.
* The CAM_CLK_CTRL *is* really the right place. */
if (cpu_is_omap16xx())
omap_writel(omap_readl(ULPD_CAM_CLK_CTRL) | 0x04, ULPD_CAM_CLK_CTRL);
return 0;
}
#if defined (CONFIG_ARCH_OMAP16XX) || defined (CONFIG_ARCH_OMAP24XX)
static int omap_gpio_suspend(struct sys_device *dev, pm_message_t mesg)
{
int i;
if (!cpu_is_omap24xx() && !cpu_is_omap16xx())
return 0;
for (i = 0; i < gpio_bank_count; i++) {
struct gpio_bank *bank = &gpio_bank[i];
void __iomem *wake_status;
void __iomem *wake_clear;
void __iomem *wake_set;
switch (bank->method) {
case METHOD_GPIO_1610:
wake_status = bank->base + OMAP1610_GPIO_WAKEUPENABLE;
wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
break;
case METHOD_GPIO_24XX:
wake_status = bank->base + OMAP24XX_GPIO_SETWKUENA;
wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
break;
default:
continue;
}
spin_lock(&bank->lock);
bank->saved_wakeup = __raw_readl(wake_status);
__raw_writel(0xffffffff, wake_clear);
__raw_writel(bank->suspend_wakeup, wake_set);
spin_unlock(&bank->lock);
}
return 0;
}
static int omap_gpio_resume(struct sys_device *dev)
{
int i;
if (!cpu_is_omap24xx() && !cpu_is_omap16xx())
return 0;
for (i = 0; i < gpio_bank_count; i++) {
struct gpio_bank *bank = &gpio_bank[i];
void __iomem *wake_clear;
void __iomem *wake_set;
switch (bank->method) {
case METHOD_GPIO_1610:
wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
break;
case METHOD_GPIO_24XX:
wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
break;
default:
continue;
}
spin_lock(&bank->lock);
__raw_writel(0xffffffff, wake_clear);
__raw_writel(bank->saved_wakeup, wake_set);
spin_unlock(&bank->lock);
}
return 0;
}
static struct sysdev_class omap_gpio_sysclass = {
set_kset_name("gpio"),
.suspend = omap_gpio_suspend,
.resume = omap_gpio_resume,
};
static struct sys_device omap_gpio_device = {
.id = 0,
.cls = &omap_gpio_sysclass,
};
#endif
/*
* This may get called early from board specific init
* for boards that have interrupts routed via FPGA.
*/
int omap_gpio_init(void)
{
if (!initialized)
return _omap_gpio_init();
else
return 0;
}
static int __init omap_gpio_sysinit(void)
{
int ret = 0;
if (!initialized)
ret = _omap_gpio_init();
#if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP24XX)
if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
if (ret == 0) {
ret = sysdev_class_register(&omap_gpio_sysclass);
if (ret == 0)
ret = sysdev_register(&omap_gpio_device);
}
}
#endif
return ret;
}
EXPORT_SYMBOL(omap_request_gpio);
EXPORT_SYMBOL(omap_free_gpio);
EXPORT_SYMBOL(omap_set_gpio_direction);
EXPORT_SYMBOL(omap_set_gpio_dataout);
EXPORT_SYMBOL(omap_get_gpio_datain);
arch_initcall(omap_gpio_sysinit);
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