/* * Support functions for OMAP GPIO * * Copyright (C) 2003-2005 Nokia Corporation * Written by Juha Yrjölä <juha.yrjola@nokia.com> * * Copyright (C) 2009 Texas Instruments * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.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/interrupt.h> #include <linux/syscore_ops.h> #include <linux/err.h> #include <linux/clk.h> #include <linux/io.h> #include <linux/slab.h> #include <linux/pm_runtime.h> #include <mach/hardware.h> #include <asm/irq.h> #include <mach/irqs.h> #include <mach/gpio.h> #include <asm/mach/irq.h> struct gpio_bank { unsigned long pbase; void __iomem *base; u16 irq; u16 virtual_irq_start; int method; #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS) u32 suspend_wakeup; u32 saved_wakeup; #endif u32 non_wakeup_gpios; u32 enabled_non_wakeup_gpios; u32 saved_datain; u32 saved_fallingdetect; u32 saved_risingdetect; u32 level_mask; u32 toggle_mask; spinlock_t lock; struct gpio_chip chip; struct clk *dbck; u32 mod_usage; u32 dbck_enable_mask; struct device *dev; bool dbck_flag; int stride; }; #ifdef CONFIG_ARCH_OMAP3 struct omap3_gpio_regs { u32 irqenable1; u32 irqenable2; u32 wake_en; u32 ctrl; u32 oe; u32 leveldetect0; u32 leveldetect1; u32 risingdetect; u32 fallingdetect; u32 dataout; }; static struct omap3_gpio_regs gpio_context[OMAP34XX_NR_GPIOS]; #endif /* * TODO: Cleanup gpio_bank usage as it is having information * related to all instances of the device */ static struct gpio_bank *gpio_bank; static int bank_width; /* TODO: Analyze removing gpio_bank_count usage from driver code */ int gpio_bank_count; static inline struct gpio_bank *get_gpio_bank(int gpio) { if (cpu_is_omap15xx()) { if (OMAP_GPIO_IS_MPUIO(gpio)) return &gpio_bank[0]; return &gpio_bank[1]; } if (cpu_is_omap16xx()) { if (OMAP_GPIO_IS_MPUIO(gpio)) return &gpio_bank[0]; return &gpio_bank[1 + (gpio >> 4)]; } if (cpu_is_omap7xx()) { if (OMAP_GPIO_IS_MPUIO(gpio)) return &gpio_bank[0]; return &gpio_bank[1 + (gpio >> 5)]; } if (cpu_is_omap24xx()) return &gpio_bank[gpio >> 5]; if (cpu_is_omap34xx() || cpu_is_omap44xx()) return &gpio_bank[gpio >> 5]; BUG(); return NULL; } static inline int get_gpio_index(int gpio) { if (cpu_is_omap7xx()) return gpio & 0x1f; if (cpu_is_omap24xx()) return gpio & 0x1f; if (cpu_is_omap34xx() || cpu_is_omap44xx()) return gpio & 0x1f; return gpio & 0x0f; } static inline int gpio_valid(int gpio) { if (gpio < 0) return -1; if (cpu_class_is_omap1() && OMAP_GPIO_IS_MPUIO(gpio)) { if (gpio >= OMAP_MAX_GPIO_LINES + 16) return -1; return 0; } if (cpu_is_omap15xx() && gpio < 16) return 0; if ((cpu_is_omap16xx()) && gpio < 64) return 0; if (cpu_is_omap7xx() && gpio < 192) return 0; if (cpu_is_omap2420() && gpio < 128) return 0; if (cpu_is_omap2430() && gpio < 160) return 0; if ((cpu_is_omap34xx() || cpu_is_omap44xx()) && gpio < 192) return 0; 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) { #ifdef CONFIG_ARCH_OMAP1 case METHOD_MPUIO: reg += OMAP_MPUIO_IO_CNTL / bank->stride; break; #endif #ifdef CONFIG_ARCH_OMAP15XX case METHOD_GPIO_1510: reg += OMAP1510_GPIO_DIR_CONTROL; break; #endif #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: reg += OMAP1610_GPIO_DIRECTION; break; #endif #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_DIR_CONTROL; break; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) case METHOD_GPIO_24XX: reg += OMAP24XX_GPIO_OE; break; #endif #if defined(CONFIG_ARCH_OMAP4) case METHOD_GPIO_44XX: reg += OMAP4_GPIO_OE; break; #endif default: WARN_ON(1); return; } l = __raw_readl(reg); if (is_input) l |= 1 << gpio; else l &= ~(1 << gpio); __raw_writel(l, reg); } static void _set_gpio_dataout(struct gpio_bank *bank, int gpio, int enable) { void __iomem *reg = bank->base; u32 l = 0; switch (bank->method) { #ifdef CONFIG_ARCH_OMAP1 case METHOD_MPUIO: reg += OMAP_MPUIO_OUTPUT / bank->stride; l = __raw_readl(reg); if (enable) l |= 1 << gpio; else l &= ~(1 << gpio); break; #endif #ifdef CONFIG_ARCH_OMAP15XX case METHOD_GPIO_1510: reg += OMAP1510_GPIO_DATA_OUTPUT; l = __raw_readl(reg); if (enable) l |= 1 << gpio; else l &= ~(1 << gpio); break; #endif #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: if (enable) reg += OMAP1610_GPIO_SET_DATAOUT; else reg += OMAP1610_GPIO_CLEAR_DATAOUT; l = 1 << gpio; break; #endif #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_DATA_OUTPUT; l = __raw_readl(reg); if (enable) l |= 1 << gpio; else l &= ~(1 << gpio); break; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) case METHOD_GPIO_24XX: if (enable) reg += OMAP24XX_GPIO_SETDATAOUT; else reg += OMAP24XX_GPIO_CLEARDATAOUT; l = 1 << gpio; break; #endif #ifdef CONFIG_ARCH_OMAP4 case METHOD_GPIO_44XX: if (enable) reg += OMAP4_GPIO_SETDATAOUT; else reg += OMAP4_GPIO_CLEARDATAOUT; l = 1 << gpio; break; #endif default: WARN_ON(1); return; } __raw_writel(l, reg); } static int _get_gpio_datain(struct gpio_bank *bank, int gpio) { void __iomem *reg; if (check_gpio(gpio) < 0) return -EINVAL; reg = bank->base; switch (bank->method) { #ifdef CONFIG_ARCH_OMAP1 case METHOD_MPUIO: reg += OMAP_MPUIO_INPUT_LATCH / bank->stride; break; #endif #ifdef CONFIG_ARCH_OMAP15XX case METHOD_GPIO_1510: reg += OMAP1510_GPIO_DATA_INPUT; break; #endif #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: reg += OMAP1610_GPIO_DATAIN; break; #endif #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_DATA_INPUT; break; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) case METHOD_GPIO_24XX: reg += OMAP24XX_GPIO_DATAIN; break; #endif #ifdef CONFIG_ARCH_OMAP4 case METHOD_GPIO_44XX: reg += OMAP4_GPIO_DATAIN; break; #endif default: return -EINVAL; } return (__raw_readl(reg) & (1 << get_gpio_index(gpio))) != 0; } static int _get_gpio_dataout(struct gpio_bank *bank, int gpio) { void __iomem *reg; if (check_gpio(gpio) < 0) return -EINVAL; reg = bank->base; switch (bank->method) { #ifdef CONFIG_ARCH_OMAP1 case METHOD_MPUIO: reg += OMAP_MPUIO_OUTPUT / bank->stride; break; #endif #ifdef CONFIG_ARCH_OMAP15XX case METHOD_GPIO_1510: reg += OMAP1510_GPIO_DATA_OUTPUT; break; #endif #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: reg += OMAP1610_GPIO_DATAOUT; break; #endif #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_DATA_OUTPUT; break; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) case METHOD_GPIO_24XX: reg += OMAP24XX_GPIO_DATAOUT; break; #endif #ifdef CONFIG_ARCH_OMAP4 case METHOD_GPIO_44XX: reg += OMAP4_GPIO_DATAOUT; break; #endif default: return -EINVAL; } 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) /** * _set_gpio_debounce - low level gpio debounce time * @bank: the gpio bank we're acting upon * @gpio: the gpio number on this @gpio * @debounce: debounce time to use * * OMAP's debounce time is in 31us steps so we need * to convert and round up to the closest unit. */ static void _set_gpio_debounce(struct gpio_bank *bank, unsigned gpio, unsigned debounce) { void __iomem *reg = bank->base; u32 val; u32 l; if (!bank->dbck_flag) return; if (debounce < 32) debounce = 0x01; else if (debounce > 7936) debounce = 0xff; else debounce = (debounce / 0x1f) - 1; l = 1 << get_gpio_index(gpio); if (bank->method == METHOD_GPIO_44XX) reg += OMAP4_GPIO_DEBOUNCINGTIME; else reg += OMAP24XX_GPIO_DEBOUNCE_VAL; __raw_writel(debounce, reg); reg = bank->base; if (bank->method == METHOD_GPIO_44XX) reg += OMAP4_GPIO_DEBOUNCENABLE; else reg += OMAP24XX_GPIO_DEBOUNCE_EN; val = __raw_readl(reg); if (debounce) { val |= l; clk_enable(bank->dbck); } else { val &= ~l; clk_disable(bank->dbck); } bank->dbck_enable_mask = val; __raw_writel(val, reg); } #ifdef CONFIG_ARCH_OMAP2PLUS 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; if (cpu_is_omap44xx()) { MOD_REG_BIT(OMAP4_GPIO_LEVELDETECT0, gpio_bit, trigger & IRQ_TYPE_LEVEL_LOW); MOD_REG_BIT(OMAP4_GPIO_LEVELDETECT1, gpio_bit, trigger & IRQ_TYPE_LEVEL_HIGH); MOD_REG_BIT(OMAP4_GPIO_RISINGDETECT, gpio_bit, trigger & IRQ_TYPE_EDGE_RISING); MOD_REG_BIT(OMAP4_GPIO_FALLINGDETECT, gpio_bit, trigger & IRQ_TYPE_EDGE_FALLING); } else { MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT0, gpio_bit, trigger & IRQ_TYPE_LEVEL_LOW); MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT1, gpio_bit, trigger & IRQ_TYPE_LEVEL_HIGH); MOD_REG_BIT(OMAP24XX_GPIO_RISINGDETECT, gpio_bit, trigger & IRQ_TYPE_EDGE_RISING); MOD_REG_BIT(OMAP24XX_GPIO_FALLINGDETECT, gpio_bit, trigger & IRQ_TYPE_EDGE_FALLING); } if (likely(!(bank->non_wakeup_gpios & gpio_bit))) { if (cpu_is_omap44xx()) { MOD_REG_BIT(OMAP4_GPIO_IRQWAKEN0, gpio_bit, trigger != 0); } else { /* * GPIO wakeup request can only be generated on edge * transitions */ if (trigger & IRQ_TYPE_EDGE_BOTH) __raw_writel(1 << gpio, bank->base + OMAP24XX_GPIO_SETWKUENA); else __raw_writel(1 << gpio, bank->base + OMAP24XX_GPIO_CLEARWKUENA); } } /* This part needs to be executed always for OMAP34xx */ if (cpu_is_omap34xx() || (bank->non_wakeup_gpios & gpio_bit)) { /* * Log the edge gpio and manually trigger the IRQ * after resume if the input level changes * to avoid irq lost during PER RET/OFF mode * Applies for omap2 non-wakeup gpio and all omap3 gpios */ if (trigger & IRQ_TYPE_EDGE_BOTH) bank->enabled_non_wakeup_gpios |= gpio_bit; else bank->enabled_non_wakeup_gpios &= ~gpio_bit; } if (cpu_is_omap44xx()) { bank->level_mask = __raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT0) | __raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT1); } else { bank->level_mask = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0) | __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1); } } #endif #ifdef CONFIG_ARCH_OMAP1 /* * This only applies to chips that can't do both rising and falling edge * detection at once. For all other chips, this function is a noop. */ static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) { void __iomem *reg = bank->base; u32 l = 0; switch (bank->method) { case METHOD_MPUIO: reg += OMAP_MPUIO_GPIO_INT_EDGE / bank->stride; break; #ifdef CONFIG_ARCH_OMAP15XX case METHOD_GPIO_1510: reg += OMAP1510_GPIO_INT_CONTROL; break; #endif #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_INT_CONTROL; break; #endif default: return; } l = __raw_readl(reg); if ((l >> gpio) & 1) l &= ~(1 << gpio); else l |= 1 << gpio; __raw_writel(l, reg); } #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) { #ifdef CONFIG_ARCH_OMAP1 case METHOD_MPUIO: reg += OMAP_MPUIO_GPIO_INT_EDGE / bank->stride; l = __raw_readl(reg); if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) bank->toggle_mask |= 1 << gpio; if (trigger & IRQ_TYPE_EDGE_RISING) l |= 1 << gpio; else if (trigger & IRQ_TYPE_EDGE_FALLING) l &= ~(1 << gpio); else goto bad; break; #endif #ifdef CONFIG_ARCH_OMAP15XX case METHOD_GPIO_1510: reg += OMAP1510_GPIO_INT_CONTROL; l = __raw_readl(reg); if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) bank->toggle_mask |= 1 << gpio; if (trigger & IRQ_TYPE_EDGE_RISING) l |= 1 << gpio; else if (trigger & IRQ_TYPE_EDGE_FALLING) l &= ~(1 << gpio); else goto bad; break; #endif #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: if (gpio & 0x08) reg += OMAP1610_GPIO_EDGE_CTRL2; else reg += OMAP1610_GPIO_EDGE_CTRL1; gpio &= 0x07; l = __raw_readl(reg); l &= ~(3 << (gpio << 1)); if (trigger & IRQ_TYPE_EDGE_RISING) l |= 2 << (gpio << 1); if (trigger & IRQ_TYPE_EDGE_FALLING) 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 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_INT_CONTROL; l = __raw_readl(reg); if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) bank->toggle_mask |= 1 << gpio; if (trigger & IRQ_TYPE_EDGE_RISING) l |= 1 << gpio; else if (trigger & IRQ_TYPE_EDGE_FALLING) l &= ~(1 << gpio); else goto bad; break; #endif #ifdef CONFIG_ARCH_OMAP2PLUS case METHOD_GPIO_24XX: case METHOD_GPIO_44XX: set_24xx_gpio_triggering(bank, gpio, trigger); return 0; #endif default: goto bad; } __raw_writel(l, reg); return 0; bad: return -EINVAL; } static int gpio_irq_type(struct irq_data *d, unsigned type) { struct gpio_bank *bank; unsigned gpio; int retval; unsigned long flags; if (!cpu_class_is_omap2() && d->irq > IH_MPUIO_BASE) gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE); else gpio = d->irq - IH_GPIO_BASE; if (check_gpio(gpio) < 0) return -EINVAL; if (type & ~IRQ_TYPE_SENSE_MASK) return -EINVAL; /* OMAP1 allows only only edge triggering */ if (!cpu_class_is_omap2() && (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))) return -EINVAL; bank = irq_data_get_irq_chip_data(d); spin_lock_irqsave(&bank->lock, flags); retval = _set_gpio_triggering(bank, get_gpio_index(gpio), type); spin_unlock_irqrestore(&bank->lock, flags); if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) __irq_set_handler_locked(d->irq, handle_level_irq); else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) __irq_set_handler_locked(d->irq, handle_edge_irq); return retval; } static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask) { void __iomem *reg = bank->base; switch (bank->method) { #ifdef CONFIG_ARCH_OMAP1 case METHOD_MPUIO: /* MPUIO irqstatus is reset by reading the status register, * so do nothing here */ return; #endif #ifdef CONFIG_ARCH_OMAP15XX case METHOD_GPIO_1510: reg += OMAP1510_GPIO_INT_STATUS; break; #endif #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: reg += OMAP1610_GPIO_IRQSTATUS1; break; #endif #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_INT_STATUS; break; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) case METHOD_GPIO_24XX: reg += OMAP24XX_GPIO_IRQSTATUS1; break; #endif #if defined(CONFIG_ARCH_OMAP4) case METHOD_GPIO_44XX: reg += OMAP4_GPIO_IRQSTATUS0; break; #endif default: WARN_ON(1); return; } __raw_writel(gpio_mask, reg); /* Workaround for clearing DSP GPIO interrupts to allow retention */ if (cpu_is_omap24xx() || cpu_is_omap34xx()) reg = bank->base + OMAP24XX_GPIO_IRQSTATUS2; else if (cpu_is_omap44xx()) reg = bank->base + OMAP4_GPIO_IRQSTATUS1; if (cpu_is_omap24xx() || cpu_is_omap34xx() || cpu_is_omap44xx()) { __raw_writel(gpio_mask, reg); /* Flush posted write for the irq status to avoid spurious interrupts */ __raw_readl(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; int inv = 0; u32 l; u32 mask; switch (bank->method) { #ifdef CONFIG_ARCH_OMAP1 case METHOD_MPUIO: reg += OMAP_MPUIO_GPIO_MASKIT / bank->stride; mask = 0xffff; inv = 1; break; #endif #ifdef CONFIG_ARCH_OMAP15XX case METHOD_GPIO_1510: reg += OMAP1510_GPIO_INT_MASK; mask = 0xffff; inv = 1; break; #endif #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: reg += OMAP1610_GPIO_IRQENABLE1; mask = 0xffff; break; #endif #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_INT_MASK; mask = 0xffffffff; inv = 1; break; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) case METHOD_GPIO_24XX: reg += OMAP24XX_GPIO_IRQENABLE1; mask = 0xffffffff; break; #endif #if defined(CONFIG_ARCH_OMAP4) case METHOD_GPIO_44XX: reg += OMAP4_GPIO_IRQSTATUSSET0; mask = 0xffffffff; break; #endif default: WARN_ON(1); 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) { #ifdef CONFIG_ARCH_OMAP1 case METHOD_MPUIO: reg += OMAP_MPUIO_GPIO_MASKIT / bank->stride; l = __raw_readl(reg); if (enable) l &= ~(gpio_mask); else l |= gpio_mask; break; #endif #ifdef CONFIG_ARCH_OMAP15XX case METHOD_GPIO_1510: reg += OMAP1510_GPIO_INT_MASK; l = __raw_readl(reg); if (enable) l &= ~(gpio_mask); else l |= gpio_mask; break; #endif #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: if (enable) reg += OMAP1610_GPIO_SET_IRQENABLE1; else reg += OMAP1610_GPIO_CLEAR_IRQENABLE1; l = gpio_mask; break; #endif #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_INT_MASK; l = __raw_readl(reg); if (enable) l &= ~(gpio_mask); else l |= gpio_mask; break; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) case METHOD_GPIO_24XX: if (enable) reg += OMAP24XX_GPIO_SETIRQENABLE1; else reg += OMAP24XX_GPIO_CLEARIRQENABLE1; l = gpio_mask; break; #endif #ifdef CONFIG_ARCH_OMAP4 case METHOD_GPIO_44XX: if (enable) reg += OMAP4_GPIO_IRQSTATUSSET0; else reg += OMAP4_GPIO_IRQSTATUSCLR0; l = gpio_mask; break; #endif default: WARN_ON(1); 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) { unsigned long uninitialized_var(flags); switch (bank->method) { #ifdef CONFIG_ARCH_OMAP16XX case METHOD_MPUIO: case METHOD_GPIO_1610: spin_lock_irqsave(&bank->lock, flags); if (enable) bank->suspend_wakeup |= (1 << gpio); else bank->suspend_wakeup &= ~(1 << gpio); spin_unlock_irqrestore(&bank->lock, flags); return 0; #endif #ifdef CONFIG_ARCH_OMAP2PLUS case METHOD_GPIO_24XX: case METHOD_GPIO_44XX: if (bank->non_wakeup_gpios & (1 << gpio)) { printk(KERN_ERR "Unable to modify wakeup on " "non-wakeup GPIO%d\n", (bank - gpio_bank) * 32 + gpio); return -EINVAL; } spin_lock_irqsave(&bank->lock, flags); if (enable) bank->suspend_wakeup |= (1 << gpio); else bank->suspend_wakeup &= ~(1 << gpio); spin_unlock_irqrestore(&bank->lock, flags); 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), IRQ_TYPE_NONE); } /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */ static int gpio_wake_enable(struct irq_data *d, unsigned int enable) { unsigned int gpio = d->irq - IH_GPIO_BASE; struct gpio_bank *bank; int retval; if (check_gpio(gpio) < 0) return -ENODEV; bank = irq_data_get_irq_chip_data(d); retval = _set_gpio_wakeup(bank, get_gpio_index(gpio), enable); return retval; } static int omap_gpio_request(struct gpio_chip *chip, unsigned offset) { struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip); unsigned long flags; spin_lock_irqsave(&bank->lock, flags); /* Set trigger to none. You need to enable the desired trigger with * request_irq() or set_irq_type(). */ _set_gpio_triggering(bank, offset, IRQ_TYPE_NONE); #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 << offset), reg); } #endif if (!cpu_class_is_omap1()) { if (!bank->mod_usage) { void __iomem *reg = bank->base; u32 ctrl; if (cpu_is_omap24xx() || cpu_is_omap34xx()) reg += OMAP24XX_GPIO_CTRL; else if (cpu_is_omap44xx()) reg += OMAP4_GPIO_CTRL; ctrl = __raw_readl(reg); /* Module is enabled, clocks are not gated */ ctrl &= 0xFFFFFFFE; __raw_writel(ctrl, reg); } bank->mod_usage |= 1 << offset; } spin_unlock_irqrestore(&bank->lock, flags); return 0; } static void omap_gpio_free(struct gpio_chip *chip, unsigned offset) { struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip); unsigned long flags; spin_lock_irqsave(&bank->lock, flags); #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 << offset, reg); } #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) 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 << offset, reg); } #endif #ifdef CONFIG_ARCH_OMAP4 if (bank->method == METHOD_GPIO_44XX) { /* Disable wake-up during idle for dynamic tick */ void __iomem *reg = bank->base + OMAP4_GPIO_IRQWAKEN0; __raw_writel(1 << offset, reg); } #endif if (!cpu_class_is_omap1()) { bank->mod_usage &= ~(1 << offset); if (!bank->mod_usage) { void __iomem *reg = bank->base; u32 ctrl; if (cpu_is_omap24xx() || cpu_is_omap34xx()) reg += OMAP24XX_GPIO_CTRL; else if (cpu_is_omap44xx()) reg += OMAP4_GPIO_CTRL; ctrl = __raw_readl(reg); /* Module is disabled, clocks are gated */ ctrl |= 1; __raw_writel(ctrl, reg); } } _reset_gpio(bank, bank->chip.base + offset); spin_unlock_irqrestore(&bank->lock, flags); } /* * 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, gpio_index; struct gpio_bank *bank; u32 retrigger = 0; int unmasked = 0; struct irq_chip *chip = irq_desc_get_chip(desc); chained_irq_enter(chip, desc); bank = irq_get_handler_data(irq); #ifdef CONFIG_ARCH_OMAP1 if (bank->method == METHOD_MPUIO) isr_reg = bank->base + OMAP_MPUIO_GPIO_INT / bank->stride; #endif #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 #if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850) if (bank->method == METHOD_GPIO_7XX) isr_reg = bank->base + OMAP7XX_GPIO_INT_STATUS; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) if (bank->method == METHOD_GPIO_24XX) isr_reg = bank->base + OMAP24XX_GPIO_IRQSTATUS1; #endif #if defined(CONFIG_ARCH_OMAP4) if (bank->method == METHOD_GPIO_44XX) isr_reg = bank->base + OMAP4_GPIO_IRQSTATUS0; #endif if (WARN_ON(!isr_reg)) goto exit; 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_class_is_omap2()) { level_mask = bank->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; chained_irq_exit(chip, desc); } isr |= retrigger; retrigger = 0; if (!isr) break; gpio_irq = bank->virtual_irq_start; for (; isr != 0; isr >>= 1, gpio_irq++) { gpio_index = get_gpio_index(irq_to_gpio(gpio_irq)); if (!(isr & 1)) continue; #ifdef CONFIG_ARCH_OMAP1 /* * Some chips can't respond to both rising and falling * at the same time. If this irq was requested with * both flags, we need to flip the ICR data for the IRQ * to respond to the IRQ for the opposite direction. * This will be indicated in the bank toggle_mask. */ if (bank->toggle_mask & (1 << gpio_index)) _toggle_gpio_edge_triggering(bank, gpio_index); #endif generic_handle_irq(gpio_irq); } } /* 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 */ exit: if (!unmasked) chained_irq_exit(chip, desc); } static void gpio_irq_shutdown(struct irq_data *d) { unsigned int gpio = d->irq - IH_GPIO_BASE; struct gpio_bank *bank = irq_data_get_irq_chip_data(d); unsigned long flags; spin_lock_irqsave(&bank->lock, flags); _reset_gpio(bank, gpio); spin_unlock_irqrestore(&bank->lock, flags); } static void gpio_ack_irq(struct irq_data *d) { unsigned int gpio = d->irq - IH_GPIO_BASE; struct gpio_bank *bank = irq_data_get_irq_chip_data(d); _clear_gpio_irqstatus(bank, gpio); } static void gpio_mask_irq(struct irq_data *d) { unsigned int gpio = d->irq - IH_GPIO_BASE; struct gpio_bank *bank = irq_data_get_irq_chip_data(d); unsigned long flags; spin_lock_irqsave(&bank->lock, flags); _set_gpio_irqenable(bank, gpio, 0); _set_gpio_triggering(bank, get_gpio_index(gpio), IRQ_TYPE_NONE); spin_unlock_irqrestore(&bank->lock, flags); } static void gpio_unmask_irq(struct irq_data *d) { unsigned int gpio = d->irq - IH_GPIO_BASE; struct gpio_bank *bank = irq_data_get_irq_chip_data(d); unsigned int irq_mask = 1 << get_gpio_index(gpio); u32 trigger = irqd_get_trigger_type(d); unsigned long flags; spin_lock_irqsave(&bank->lock, flags); if (trigger) _set_gpio_triggering(bank, get_gpio_index(gpio), trigger); /* For level-triggered GPIOs, the clearing must be done after * the HW source is cleared, thus after the handler has run */ if (bank->level_mask & irq_mask) { _set_gpio_irqenable(bank, gpio, 0); _clear_gpio_irqstatus(bank, gpio); } _set_gpio_irqenable(bank, gpio, 1); spin_unlock_irqrestore(&bank->lock, flags); } static struct irq_chip gpio_irq_chip = { .name = "GPIO", .irq_shutdown = gpio_irq_shutdown, .irq_ack = gpio_ack_irq, .irq_mask = gpio_mask_irq, .irq_unmask = gpio_unmask_irq, .irq_set_type = gpio_irq_type, .irq_set_wake = gpio_wake_enable, }; /*---------------------------------------------------------------------*/ #ifdef CONFIG_ARCH_OMAP1 /* MPUIO uses the always-on 32k clock */ static void mpuio_ack_irq(struct irq_data *d) { /* The ISR is reset automatically, so do nothing here. */ } static void mpuio_mask_irq(struct irq_data *d) { unsigned int gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE); struct gpio_bank *bank = irq_data_get_irq_chip_data(d); _set_gpio_irqenable(bank, gpio, 0); } static void mpuio_unmask_irq(struct irq_data *d) { unsigned int gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE); struct gpio_bank *bank = irq_data_get_irq_chip_data(d); _set_gpio_irqenable(bank, gpio, 1); } static struct irq_chip mpuio_irq_chip = { .name = "MPUIO", .irq_ack = mpuio_ack_irq, .irq_mask = mpuio_mask_irq, .irq_unmask = mpuio_unmask_irq, .irq_set_type = gpio_irq_type, #ifdef CONFIG_ARCH_OMAP16XX /* REVISIT: assuming only 16xx supports MPUIO wake events */ .irq_set_wake = gpio_wake_enable, #endif }; #define bank_is_mpuio(bank) ((bank)->method == METHOD_MPUIO) #ifdef CONFIG_ARCH_OMAP16XX #include <linux/platform_device.h> static int omap_mpuio_suspend_noirq(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct gpio_bank *bank = platform_get_drvdata(pdev); void __iomem *mask_reg = bank->base + OMAP_MPUIO_GPIO_MASKIT / bank->stride; unsigned long flags; spin_lock_irqsave(&bank->lock, flags); bank->saved_wakeup = __raw_readl(mask_reg); __raw_writel(0xffff & ~bank->suspend_wakeup, mask_reg); spin_unlock_irqrestore(&bank->lock, flags); return 0; } static int omap_mpuio_resume_noirq(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct gpio_bank *bank = platform_get_drvdata(pdev); void __iomem *mask_reg = bank->base + OMAP_MPUIO_GPIO_MASKIT / bank->stride; unsigned long flags; spin_lock_irqsave(&bank->lock, flags); __raw_writel(bank->saved_wakeup, mask_reg); spin_unlock_irqrestore(&bank->lock, flags); return 0; } static const struct dev_pm_ops omap_mpuio_dev_pm_ops = { .suspend_noirq = omap_mpuio_suspend_noirq, .resume_noirq = omap_mpuio_resume_noirq, }; /* use platform_driver for this. */ static struct platform_driver omap_mpuio_driver = { .driver = { .name = "mpuio", .pm = &omap_mpuio_dev_pm_ops, }, }; static struct platform_device omap_mpuio_device = { .name = "mpuio", .id = -1, .dev = { .driver = &omap_mpuio_driver.driver, } /* could list the /proc/iomem resources */ }; static inline void mpuio_init(void) { struct gpio_bank *bank = get_gpio_bank(OMAP_MPUIO(0)); platform_set_drvdata(&omap_mpuio_device, bank); if (platform_driver_register(&omap_mpuio_driver) == 0) (void) platform_device_register(&omap_mpuio_device); } #else static inline void mpuio_init(void) {} #endif /* 16xx */ #else extern struct irq_chip mpuio_irq_chip; #define bank_is_mpuio(bank) 0 static inline void mpuio_init(void) {} #endif /*---------------------------------------------------------------------*/ /* REVISIT these are stupid implementations! replace by ones that * don't switch on METHOD_* and which mostly avoid spinlocks */ static int gpio_input(struct gpio_chip *chip, unsigned offset) { struct gpio_bank *bank; unsigned long flags; bank = container_of(chip, struct gpio_bank, chip); spin_lock_irqsave(&bank->lock, flags); _set_gpio_direction(bank, offset, 1); spin_unlock_irqrestore(&bank->lock, flags); return 0; } static int gpio_is_input(struct gpio_bank *bank, int mask) { void __iomem *reg = bank->base; switch (bank->method) { case METHOD_MPUIO: reg += OMAP_MPUIO_IO_CNTL / bank->stride; break; case METHOD_GPIO_1510: reg += OMAP1510_GPIO_DIR_CONTROL; break; case METHOD_GPIO_1610: reg += OMAP1610_GPIO_DIRECTION; break; case METHOD_GPIO_7XX: reg += OMAP7XX_GPIO_DIR_CONTROL; break; case METHOD_GPIO_24XX: reg += OMAP24XX_GPIO_OE; break; case METHOD_GPIO_44XX: reg += OMAP4_GPIO_OE; break; default: WARN_ONCE(1, "gpio_is_input: incorrect OMAP GPIO method"); return -EINVAL; } return __raw_readl(reg) & mask; } static int gpio_get(struct gpio_chip *chip, unsigned offset) { struct gpio_bank *bank; void __iomem *reg; int gpio; u32 mask; gpio = chip->base + offset; bank = get_gpio_bank(gpio); reg = bank->base; mask = 1 << get_gpio_index(gpio); if (gpio_is_input(bank, mask)) return _get_gpio_datain(bank, gpio); else return _get_gpio_dataout(bank, gpio); } static int gpio_output(struct gpio_chip *chip, unsigned offset, int value) { struct gpio_bank *bank; unsigned long flags; bank = container_of(chip, struct gpio_bank, chip); spin_lock_irqsave(&bank->lock, flags); _set_gpio_dataout(bank, offset, value); _set_gpio_direction(bank, offset, 0); spin_unlock_irqrestore(&bank->lock, flags); return 0; } static int gpio_debounce(struct gpio_chip *chip, unsigned offset, unsigned debounce) { struct gpio_bank *bank; unsigned long flags; bank = container_of(chip, struct gpio_bank, chip); if (!bank->dbck) { bank->dbck = clk_get(bank->dev, "dbclk"); if (IS_ERR(bank->dbck)) dev_err(bank->dev, "Could not get gpio dbck\n"); } spin_lock_irqsave(&bank->lock, flags); _set_gpio_debounce(bank, offset, debounce); spin_unlock_irqrestore(&bank->lock, flags); return 0; } static void gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct gpio_bank *bank; unsigned long flags; bank = container_of(chip, struct gpio_bank, chip); spin_lock_irqsave(&bank->lock, flags); _set_gpio_dataout(bank, offset, value); spin_unlock_irqrestore(&bank->lock, flags); } static int gpio_2irq(struct gpio_chip *chip, unsigned offset) { struct gpio_bank *bank; bank = container_of(chip, struct gpio_bank, chip); return bank->virtual_irq_start + offset; } /*---------------------------------------------------------------------*/ static void __init omap_gpio_show_rev(struct gpio_bank *bank) { u32 rev; if (cpu_is_omap16xx() && !(bank->method != METHOD_MPUIO)) rev = __raw_readw(bank->base + OMAP1610_GPIO_REVISION); else if (cpu_is_omap24xx() || cpu_is_omap34xx()) rev = __raw_readl(bank->base + OMAP24XX_GPIO_REVISION); else if (cpu_is_omap44xx()) rev = __raw_readl(bank->base + OMAP4_GPIO_REVISION); else return; printk(KERN_INFO "OMAP GPIO hardware version %d.%d\n", (rev >> 4) & 0x0f, rev & 0x0f); } /* This lock class tells lockdep that GPIO irqs are in a different * category than their parents, so it won't report false recursion. */ static struct lock_class_key gpio_lock_class; static inline int init_gpio_info(struct platform_device *pdev) { /* TODO: Analyze removing gpio_bank_count usage from driver code */ gpio_bank = kzalloc(gpio_bank_count * sizeof(struct gpio_bank), GFP_KERNEL); if (!gpio_bank) { dev_err(&pdev->dev, "Memory alloc failed for gpio_bank\n"); return -ENOMEM; } return 0; } /* TODO: Cleanup cpu_is_* checks */ static void omap_gpio_mod_init(struct gpio_bank *bank, int id) { if (cpu_class_is_omap2()) { if (cpu_is_omap44xx()) { __raw_writel(0xffffffff, bank->base + OMAP4_GPIO_IRQSTATUSCLR0); __raw_writel(0x00000000, bank->base + OMAP4_GPIO_DEBOUNCENABLE); /* Initialize interface clk ungated, module enabled */ __raw_writel(0, bank->base + OMAP4_GPIO_CTRL); } else if (cpu_is_omap34xx()) { __raw_writel(0x00000000, bank->base + OMAP24XX_GPIO_IRQENABLE1); __raw_writel(0xffffffff, bank->base + OMAP24XX_GPIO_IRQSTATUS1); __raw_writel(0x00000000, bank->base + OMAP24XX_GPIO_DEBOUNCE_EN); /* Initialize interface clk ungated, module enabled */ __raw_writel(0, bank->base + OMAP24XX_GPIO_CTRL); } else if (cpu_is_omap24xx()) { static const u32 non_wakeup_gpios[] = { 0xe203ffc0, 0x08700040 }; if (id < ARRAY_SIZE(non_wakeup_gpios)) bank->non_wakeup_gpios = non_wakeup_gpios[id]; } } else if (cpu_class_is_omap1()) { if (bank_is_mpuio(bank)) __raw_writew(0xffff, bank->base + OMAP_MPUIO_GPIO_MASKIT / bank->stride); if (cpu_is_omap15xx() && bank->method == METHOD_GPIO_1510) { __raw_writew(0xffff, bank->base + OMAP1510_GPIO_INT_MASK); __raw_writew(0x0000, bank->base + OMAP1510_GPIO_INT_STATUS); } if (cpu_is_omap16xx() && 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); /* * Enable system clock for GPIO module. * The CAM_CLK_CTRL *is* really the right place. */ omap_writel(omap_readl(ULPD_CAM_CLK_CTRL) | 0x04, ULPD_CAM_CLK_CTRL); } if (cpu_is_omap7xx() && bank->method == METHOD_GPIO_7XX) { __raw_writel(0xffffffff, bank->base + OMAP7XX_GPIO_INT_MASK); __raw_writel(0x00000000, bank->base + OMAP7XX_GPIO_INT_STATUS); } } } static void __devinit omap_gpio_chip_init(struct gpio_bank *bank) { int j; static int gpio; bank->mod_usage = 0; /* * REVISIT eventually switch from OMAP-specific gpio structs * over to the generic ones */ bank->chip.request = omap_gpio_request; bank->chip.free = omap_gpio_free; bank->chip.direction_input = gpio_input; bank->chip.get = gpio_get; bank->chip.direction_output = gpio_output; bank->chip.set_debounce = gpio_debounce; bank->chip.set = gpio_set; bank->chip.to_irq = gpio_2irq; if (bank_is_mpuio(bank)) { bank->chip.label = "mpuio"; #ifdef CONFIG_ARCH_OMAP16XX bank->chip.dev = &omap_mpuio_device.dev; #endif bank->chip.base = OMAP_MPUIO(0); } else { bank->chip.label = "gpio"; bank->chip.base = gpio; gpio += bank_width; } bank->chip.ngpio = bank_width; gpiochip_add(&bank->chip); for (j = bank->virtual_irq_start; j < bank->virtual_irq_start + bank_width; j++) { irq_set_lockdep_class(j, &gpio_lock_class); irq_set_chip_data(j, bank); if (bank_is_mpuio(bank)) irq_set_chip(j, &mpuio_irq_chip); else irq_set_chip(j, &gpio_irq_chip); irq_set_handler(j, handle_simple_irq); set_irq_flags(j, IRQF_VALID); } irq_set_chained_handler(bank->irq, gpio_irq_handler); irq_set_handler_data(bank->irq, bank); } static int __devinit omap_gpio_probe(struct platform_device *pdev) { static int gpio_init_done; struct omap_gpio_platform_data *pdata; struct resource *res; int id; struct gpio_bank *bank; if (!pdev->dev.platform_data) return -EINVAL; pdata = pdev->dev.platform_data; if (!gpio_init_done) { int ret; ret = init_gpio_info(pdev); if (ret) return ret; } id = pdev->id; bank = &gpio_bank[id]; res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (unlikely(!res)) { dev_err(&pdev->dev, "GPIO Bank %i Invalid IRQ resource\n", id); return -ENODEV; } bank->irq = res->start; bank->virtual_irq_start = pdata->virtual_irq_start; bank->method = pdata->bank_type; bank->dev = &pdev->dev; bank->dbck_flag = pdata->dbck_flag; bank->stride = pdata->bank_stride; bank_width = pdata->bank_width; spin_lock_init(&bank->lock); /* Static mapping, never released */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (unlikely(!res)) { dev_err(&pdev->dev, "GPIO Bank %i Invalid mem resource\n", id); return -ENODEV; } bank->base = ioremap(res->start, resource_size(res)); if (!bank->base) { dev_err(&pdev->dev, "Could not ioremap gpio bank%i\n", id); return -ENOMEM; } pm_runtime_enable(bank->dev); pm_runtime_get_sync(bank->dev); omap_gpio_mod_init(bank, id); omap_gpio_chip_init(bank); omap_gpio_show_rev(bank); if (!gpio_init_done) gpio_init_done = 1; return 0; } #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS) static int omap_gpio_suspend(void) { int i; if (!cpu_class_is_omap2() && !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; unsigned long flags; switch (bank->method) { #ifdef CONFIG_ARCH_OMAP16XX 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; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) case METHOD_GPIO_24XX: wake_status = bank->base + OMAP24XX_GPIO_WAKE_EN; wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA; wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA; break; #endif #ifdef CONFIG_ARCH_OMAP4 case METHOD_GPIO_44XX: wake_status = bank->base + OMAP4_GPIO_IRQWAKEN0; wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0; wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0; break; #endif default: continue; } spin_lock_irqsave(&bank->lock, flags); bank->saved_wakeup = __raw_readl(wake_status); __raw_writel(0xffffffff, wake_clear); __raw_writel(bank->suspend_wakeup, wake_set); spin_unlock_irqrestore(&bank->lock, flags); } return 0; } static void omap_gpio_resume(void) { int i; if (!cpu_class_is_omap2() && !cpu_is_omap16xx()) return; for (i = 0; i < gpio_bank_count; i++) { struct gpio_bank *bank = &gpio_bank[i]; void __iomem *wake_clear; void __iomem *wake_set; unsigned long flags; switch (bank->method) { #ifdef CONFIG_ARCH_OMAP16XX case METHOD_GPIO_1610: wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA; wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA; break; #endif #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) case METHOD_GPIO_24XX: wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA; wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA; break; #endif #ifdef CONFIG_ARCH_OMAP4 case METHOD_GPIO_44XX: wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0; wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0; break; #endif default: continue; } spin_lock_irqsave(&bank->lock, flags); __raw_writel(0xffffffff, wake_clear); __raw_writel(bank->saved_wakeup, wake_set); spin_unlock_irqrestore(&bank->lock, flags); } } static struct syscore_ops omap_gpio_syscore_ops = { .suspend = omap_gpio_suspend, .resume = omap_gpio_resume, }; #endif #ifdef CONFIG_ARCH_OMAP2PLUS static int workaround_enabled; void omap2_gpio_prepare_for_idle(int off_mode) { int i, c = 0; int min = 0; if (cpu_is_omap34xx()) min = 1; for (i = min; i < gpio_bank_count; i++) { struct gpio_bank *bank = &gpio_bank[i]; u32 l1 = 0, l2 = 0; int j; for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++) clk_disable(bank->dbck); if (!off_mode) continue; /* If going to OFF, remove triggering for all * non-wakeup GPIOs. Otherwise spurious IRQs will be * generated. See OMAP2420 Errata item 1.101. */ if (!(bank->enabled_non_wakeup_gpios)) continue; if (cpu_is_omap24xx() || cpu_is_omap34xx()) { 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); } if (cpu_is_omap44xx()) { bank->saved_datain = __raw_readl(bank->base + OMAP4_GPIO_DATAIN); l1 = __raw_readl(bank->base + OMAP4_GPIO_FALLINGDETECT); l2 = __raw_readl(bank->base + OMAP4_GPIO_RISINGDETECT); } bank->saved_fallingdetect = l1; bank->saved_risingdetect = l2; l1 &= ~bank->enabled_non_wakeup_gpios; l2 &= ~bank->enabled_non_wakeup_gpios; if (cpu_is_omap24xx() || cpu_is_omap34xx()) { __raw_writel(l1, bank->base + OMAP24XX_GPIO_FALLINGDETECT); __raw_writel(l2, bank->base + OMAP24XX_GPIO_RISINGDETECT); } if (cpu_is_omap44xx()) { __raw_writel(l1, bank->base + OMAP4_GPIO_FALLINGDETECT); __raw_writel(l2, bank->base + OMAP4_GPIO_RISINGDETECT); } c++; } if (!c) { workaround_enabled = 0; return; } workaround_enabled = 1; } void omap2_gpio_resume_after_idle(void) { int i; int min = 0; if (cpu_is_omap34xx()) min = 1; for (i = min; i < gpio_bank_count; i++) { struct gpio_bank *bank = &gpio_bank[i]; u32 l = 0, gen, gen0, gen1; int j; for (j = 0; j < hweight_long(bank->dbck_enable_mask); j++) clk_enable(bank->dbck); if (!workaround_enabled) continue; if (!(bank->enabled_non_wakeup_gpios)) continue; if (cpu_is_omap24xx() || cpu_is_omap34xx()) { __raw_writel(bank->saved_fallingdetect, bank->base + OMAP24XX_GPIO_FALLINGDETECT); __raw_writel(bank->saved_risingdetect, bank->base + OMAP24XX_GPIO_RISINGDETECT); l = __raw_readl(bank->base + OMAP24XX_GPIO_DATAIN); } if (cpu_is_omap44xx()) { __raw_writel(bank->saved_fallingdetect, bank->base + OMAP4_GPIO_FALLINGDETECT); __raw_writel(bank->saved_risingdetect, bank->base + OMAP4_GPIO_RISINGDETECT); l = __raw_readl(bank->base + OMAP4_GPIO_DATAIN); } /* 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 ^= bank->saved_datain; l &= bank->enabled_non_wakeup_gpios; /* * No need to generate IRQs for the rising edge for gpio IRQs * configured with falling edge only; and vice versa. */ gen0 = l & bank->saved_fallingdetect; gen0 &= bank->saved_datain; gen1 = l & bank->saved_risingdetect; gen1 &= ~(bank->saved_datain); /* FIXME: Consider GPIO IRQs with level detections properly! */ gen = l & (~(bank->saved_fallingdetect) & ~(bank->saved_risingdetect)); /* Consider all GPIO IRQs needed to be updated */ gen |= gen0 | gen1; if (gen) { u32 old0, old1; if (cpu_is_omap24xx() || cpu_is_omap34xx()) { old0 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0); old1 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1); __raw_writel(old0 | gen, bank->base + OMAP24XX_GPIO_LEVELDETECT0); __raw_writel(old1 | gen, bank->base + OMAP24XX_GPIO_LEVELDETECT1); __raw_writel(old0, bank->base + OMAP24XX_GPIO_LEVELDETECT0); __raw_writel(old1, bank->base + OMAP24XX_GPIO_LEVELDETECT1); } if (cpu_is_omap44xx()) { old0 = __raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT0); old1 = __raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT1); __raw_writel(old0 | l, bank->base + OMAP4_GPIO_LEVELDETECT0); __raw_writel(old1 | l, bank->base + OMAP4_GPIO_LEVELDETECT1); __raw_writel(old0, bank->base + OMAP4_GPIO_LEVELDETECT0); __raw_writel(old1, bank->base + OMAP4_GPIO_LEVELDETECT1); } } } } #endif #ifdef CONFIG_ARCH_OMAP3 /* save the registers of bank 2-6 */ void omap_gpio_save_context(void) { int i; /* saving banks from 2-6 only since GPIO1 is in WKUP */ for (i = 1; i < gpio_bank_count; i++) { struct gpio_bank *bank = &gpio_bank[i]; gpio_context[i].irqenable1 = __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1); gpio_context[i].irqenable2 = __raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE2); gpio_context[i].wake_en = __raw_readl(bank->base + OMAP24XX_GPIO_WAKE_EN); gpio_context[i].ctrl = __raw_readl(bank->base + OMAP24XX_GPIO_CTRL); gpio_context[i].oe = __raw_readl(bank->base + OMAP24XX_GPIO_OE); gpio_context[i].leveldetect0 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0); gpio_context[i].leveldetect1 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1); gpio_context[i].risingdetect = __raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT); gpio_context[i].fallingdetect = __raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT); gpio_context[i].dataout = __raw_readl(bank->base + OMAP24XX_GPIO_DATAOUT); } } /* restore the required registers of bank 2-6 */ void omap_gpio_restore_context(void) { int i; for (i = 1; i < gpio_bank_count; i++) { struct gpio_bank *bank = &gpio_bank[i]; __raw_writel(gpio_context[i].irqenable1, bank->base + OMAP24XX_GPIO_IRQENABLE1); __raw_writel(gpio_context[i].irqenable2, bank->base + OMAP24XX_GPIO_IRQENABLE2); __raw_writel(gpio_context[i].wake_en, bank->base + OMAP24XX_GPIO_WAKE_EN); __raw_writel(gpio_context[i].ctrl, bank->base + OMAP24XX_GPIO_CTRL); __raw_writel(gpio_context[i].oe, bank->base + OMAP24XX_GPIO_OE); __raw_writel(gpio_context[i].leveldetect0, bank->base + OMAP24XX_GPIO_LEVELDETECT0); __raw_writel(gpio_context[i].leveldetect1, bank->base + OMAP24XX_GPIO_LEVELDETECT1); __raw_writel(gpio_context[i].risingdetect, bank->base + OMAP24XX_GPIO_RISINGDETECT); __raw_writel(gpio_context[i].fallingdetect, bank->base + OMAP24XX_GPIO_FALLINGDETECT); __raw_writel(gpio_context[i].dataout, bank->base + OMAP24XX_GPIO_DATAOUT); } } #endif static struct platform_driver omap_gpio_driver = { .probe = omap_gpio_probe, .driver = { .name = "omap_gpio", }, }; /* * gpio driver register needs to be done before * machine_init functions access gpio APIs. * Hence omap_gpio_drv_reg() is a postcore_initcall. */ static int __init omap_gpio_drv_reg(void) { return platform_driver_register(&omap_gpio_driver); } postcore_initcall(omap_gpio_drv_reg); static int __init omap_gpio_sysinit(void) { mpuio_init(); #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS) if (cpu_is_omap16xx() || cpu_class_is_omap2()) register_syscore_ops(&omap_gpio_syscore_ops); #endif return 0; } arch_initcall(omap_gpio_sysinit);