/* * linux/arch/arm/plat-omap/gpio.c * * Support functions for OMAP GPIO * * Copyright (C) 2003-2005 Nokia Corporation * Written by Juha Yrjölä * * 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 #include #include #include #include #include #include #include #include #include #include #include #include /* * 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_IRQSTATUS2 0x0028 #define OMAP24XX_GPIO_IRQENABLE2 0x002c #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 struct gpio_bank { void __iomem *base; u16 irq; u16 virtual_irq_start; int method; u32 reserved_map; #if defined (CONFIG_ARCH_OMAP16XX) || defined (CONFIG_ARCH_OMAP24XX) u32 suspend_wakeup; u32 saved_wakeup; #endif #ifdef CONFIG_ARCH_OMAP24XX u32 non_wakeup_gpios; u32 enabled_non_wakeup_gpios; u32 saved_datain; u32 saved_fallingdetect; u32 saved_risingdetect; #endif 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; #ifndef CONFIG_ARCH_OMAP24XX if (OMAP_GPIO_IS_MPUIO(gpio)) { if (gpio >= OMAP_MAX_GPIO_LINES + 16) return -1; return 0; } #endif #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) #ifdef CONFIG_ARCH_OMAP24XX static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger) { void __iomem *base = bank->base; 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); if (likely(!(bank->non_wakeup_gpios & gpio_bit))) { if (trigger != 0) __raw_writel(1 << gpio, bank->base + OMAP24XX_GPIO_SETWKUENA); else __raw_writel(1 << gpio, bank->base + OMAP24XX_GPIO_CLEARWKUENA); } else { if (trigger != 0) bank->enabled_non_wakeup_gpios |= gpio_bit; else bank->enabled_non_wakeup_gpios &= ~gpio_bit; } /* FIXME: Possibly do 'set_irq_handler(j, handle_level_irq)' if only level * triggering requested. */ } #endif 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; #ifdef CONFIG_ARCH_OMAP16XX 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); if (trigger) /* Enable wake-up during idle for dynamic tick */ __raw_writel(1 << gpio, bank->base + OMAP1610_GPIO_SET_WAKEUPENA); else __raw_writel(1 << gpio, bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA); break; #endif #ifdef CONFIG_ARCH_OMAP730 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; #endif #ifdef CONFIG_ARCH_OMAP24XX case METHOD_GPIO_24XX: set_24xx_gpio_triggering(bank, gpio, trigger); break; #endif 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); /* Workaround for clearing DSP GPIO interrupts to allow retention */ if (cpu_is_omap2420()) __raw_writel(gpio_mask, bank->base + OMAP24XX_GPIO_IRQSTATUS2); } 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; int inv = 0; u32 l; u32 mask; switch (bank->method) { case METHOD_MPUIO: reg += OMAP_MPUIO_GPIO_MASKIT; mask = 0xffff; inv = 1; break; case METHOD_GPIO_1510: reg += OMAP1510_GPIO_INT_MASK; mask = 0xffff; inv = 1; break; case METHOD_GPIO_1610: reg += OMAP1610_GPIO_IRQENABLE1; mask = 0xffff; break; case METHOD_GPIO_730: reg += OMAP730_GPIO_INT_MASK; mask = 0xffffffff; inv = 1; break; case METHOD_GPIO_24XX: reg += OMAP24XX_GPIO_IRQENABLE1; mask = 0xffffffff; break; default: BUG(); return 0; } l = __raw_readl(reg); if (inv) l = ~l; l &= mask; return l; } 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) { #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: spin_lock(&bank->lock); if (enable) bank->suspend_wakeup |= (1 << gpio); else bank->suspend_wakeup &= ~(1 << gpio); spin_unlock(&bank->lock); return 0; #endif #ifdef CONFIG_ARCH_OMAP24XX case METHOD_GPIO_24XX: spin_lock(&bank->lock); if (enable) { if (bank->non_wakeup_gpios & (1 << gpio)) { printk(KERN_ERR "Unable to enable wakeup on" "non-wakeup GPIO%d\n", (bank - gpio_bank) * 32 + gpio); spin_unlock(&bank->lock); return -EINVAL; } bank->suspend_wakeup |= (1 << gpio); } else bank->suspend_wakeup &= ~(1 << gpio); spin_unlock(&bank->lock); return 0; #endif default: printk(KERN_ERR "Can't enable GPIO wakeup for method %i\n", bank->method); return -EINVAL; } } static void _reset_gpio(struct gpio_bank *bank, int gpio) { _set_gpio_direction(bank, get_gpio_index(gpio), 1); _set_gpio_irqenable(bank, gpio, 0); _clear_gpio_irqstatus(bank, gpio); _set_gpio_triggering(bank, get_gpio_index(gpio), IRQT_NOEDGE); } /* 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); retval = _set_gpio_wakeup(bank, get_gpio_index(gpio), enable); 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 desired trigger with * request_irq() or set_irq_type(). */ _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 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)); _reset_gpio(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 irq_desc *desc) { 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 = get_irq_data(irq); 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 irq_desc *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->depth || (d->status & IRQ_INPROGRESS)))) { 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->depth) { /* Level triggered interrupts * won't ever be reentered */ BUG_ON(level_mask & irq_mask); d->status |= IRQ_PENDING; } continue; } desc_handle_irq(gpio_irq, d); if (unlikely((d->status & IRQ_PENDING) && !d->depth)) { irq_mask = 1 << (gpio_irq - bank->virtual_irq_start); d->status &= ~IRQ_PENDING; _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_irq_shutdown(unsigned int irq) { unsigned int gpio = irq - IH_GPIO_BASE; struct gpio_bank *bank = get_gpio_bank(gpio); _reset_gpio(bank, gpio); } 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 irq_chip gpio_irq_chip = { .name = "GPIO", .shutdown = gpio_irq_shutdown, .ack = gpio_ack_irq, .mask = gpio_mask_irq, .unmask = gpio_unmask_irq, .set_type = gpio_irq_type, .set_wake = gpio_wake_enable, }; static struct irq_chip mpuio_irq_chip = { .name = "MPUIO", .ack = mpuio_ack_irq, .mask = mpuio_mask_irq, .unmask = mpuio_unmask_irq, .set_type = gpio_irq_type, }; 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_fck)) 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) { static const u32 non_wakeup_gpios[] = { 0xe203ffc0, 0x08700040 }; __raw_writel(0x00000000, bank->base + OMAP24XX_GPIO_IRQENABLE1); __raw_writel(0xffffffff, bank->base + OMAP24XX_GPIO_IRQSTATUS1); __raw_writew(0x0015, bank->base + OMAP24XX_GPIO_SYSCONFIG); /* Initialize interface clock ungated, module enabled */ __raw_writel(0, bank->base + OMAP24XX_GPIO_CTRL); if (i < ARRAY_SIZE(non_wakeup_gpios)) bank->non_wakeup_gpios = non_wakeup_gpios[i]; 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, handle_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); #ifdef CONFIG_ARCH_OMAP24XX /* Enable autoidle for the OCP interface */ if (cpu_is_omap24xx()) omap_writel(1 << 0, 0x48019010); #endif 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 + OMAP24XX_GPIO_CLEARWKUENA; wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA; 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 #ifdef CONFIG_ARCH_OMAP24XX static int workaround_enabled; void omap2_gpio_prepare_for_retention(void) { int i, c = 0; /* Remove triggering for all non-wakeup GPIOs. Otherwise spurious * IRQs will be generated. See OMAP2420 Errata item 1.101. */ for (i = 0; i < gpio_bank_count; i++) { struct gpio_bank *bank = &gpio_bank[i]; u32 l1, l2; if (!(bank->enabled_non_wakeup_gpios)) continue; bank->saved_datain = __raw_readl(bank->base + OMAP24XX_GPIO_DATAIN); l1 = __raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT); l2 = __raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT); bank->saved_fallingdetect = l1; bank->saved_risingdetect = l2; l1 &= ~bank->enabled_non_wakeup_gpios; l2 &= ~bank->enabled_non_wakeup_gpios; __raw_writel(l1, bank->base + OMAP24XX_GPIO_FALLINGDETECT); __raw_writel(l2, bank->base + OMAP24XX_GPIO_RISINGDETECT); c++; } if (!c) { workaround_enabled = 0; return; } workaround_enabled = 1; } void omap2_gpio_resume_after_retention(void) { int i; if (!workaround_enabled) return; for (i = 0; i < gpio_bank_count; i++) { struct gpio_bank *bank = &gpio_bank[i]; u32 l; if (!(bank->enabled_non_wakeup_gpios)) continue; __raw_writel(bank->saved_fallingdetect, bank->base + OMAP24XX_GPIO_FALLINGDETECT); __raw_writel(bank->saved_risingdetect, bank->base + OMAP24XX_GPIO_RISINGDETECT); /* Check if any of the non-wakeup interrupt GPIOs have changed * state. If so, generate an IRQ by software. This is * horribly racy, but it's the best we can do to work around * this silicon bug. */ l = __raw_readl(bank->base + OMAP24XX_GPIO_DATAIN); l ^= bank->saved_datain; l &= bank->non_wakeup_gpios; if (l) { u32 old0, old1; old0 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0); old1 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1); __raw_writel(old0 | l, bank->base + OMAP24XX_GPIO_LEVELDETECT0); __raw_writel(old1 | l, bank->base + OMAP24XX_GPIO_LEVELDETECT1); __raw_writel(old0, bank->base + OMAP24XX_GPIO_LEVELDETECT0); __raw_writel(old1, bank->base + OMAP24XX_GPIO_LEVELDETECT1); } } } #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);