| /* |
| * 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/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 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; |
| |
| 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; |
| |
| isr_saved = isr = __raw_readl(isr_reg); |
| |
| 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); |
| |
| /* 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) |
| 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); |
| } |
| |
| 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 (level_mask) |
| 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); |
