/*
* 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 <asm/hardware.h>
#include <asm/hardware/clock.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_OMAP1510
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_OMAP1510
if (cpu_is_omap1510()) {
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_OMAP1510
if (cpu_is_omap1510() && 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_LOW);
MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT1, gpio_bit,
trigger & IRQT_HIGH);
MOD_REG_BIT(OMAP24XX_GPIO_RISINGDETECT, gpio_bit,
trigger & IRQT_RISING);
MOD_REG_BIT(OMAP24XX_GPIO_FALLINGDETECT, gpio_bit,
trigger & IRQT_FALLING);
/* 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_RISING)
l |= 1 << gpio;
else if (trigger == IRQT_FALLING)
l &= ~(1 << gpio);
else
goto bad;
break;
case METHOD_GPIO_1510:
reg += OMAP1510_GPIO_INT_CONTROL;
l = __raw_readl(reg);
if (trigger == IRQT_RISING)
l |= 1 << gpio;
else if (trigger == IRQT_FALLING)
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_BOTHEDGE)
BUG();
/* NOTE: knows __IRQT_{FAL,RIS}EDGE match OMAP hardware */
trigger &= 0x03;
l = __raw_readl(reg);
l &= ~(3 << (gpio << 1));
l |= trigger << (gpio << 1);
break;
case METHOD_GPIO_730:
reg += OMAP730_GPIO_INT_CONTROL;
l = __raw_readl(reg);
if (trigger == IRQT_RISING)
l |= 1 << gpio;
else if (trigger == IRQT_FALLING)
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_LOWLVL|__IRQT_HIGHLVL|IRQT_PROBE))
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 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_OMAP1510
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;
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_OMAP1510
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) {
isr = __raw_readl(isr_reg);
_enable_gpio_irqbank(bank, isr, 0);
_clear_gpio_irqbank(bank, isr);
_enable_gpio_irqbank(bank, isr, 1);
desc->chip->unmask(irq);
if (!isr)
break;
gpio_irq = bank->virtual_irq_start;
for (; isr != 0; isr >>= 1, gpio_irq++) {
struct irqdesc *d;
if (!(isr & 1))
continue;
d = irq_desc + gpio_irq;
desc_handle_irq(gpio_irq, d, regs);
}
}
}
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 = 0;
static struct clk * gpio_ck = NULL;
static int __init _omap_gpio_init(void)
{
int i;
struct gpio_bank *bank;
initialized = 1;
if (cpu_is_omap1510()) {
gpio_ck = clk_get(NULL, "arm_gpio_ck");
if (IS_ERR(gpio_ck))
printk("Could not get arm_gpio_ck\n");
else
clk_use(gpio_ck);
}
#ifdef CONFIG_ARCH_OMAP1510
if (cpu_is_omap1510()) {
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_OMAP1510
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
*/
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);
