| /* |
| * 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/device.h> |
| #include <linux/pm_runtime.h> |
| #include <linux/pm.h> |
| #include <linux/of.h> |
| #include <linux/of_device.h> |
| #include <linux/irqchip/chained_irq.h> |
| #include <linux/gpio.h> |
| #include <linux/bitops.h> |
| #include <linux/platform_data/gpio-omap.h> |
| |
| #define OFF_MODE 1 |
| |
| static LIST_HEAD(omap_gpio_list); |
| |
| struct gpio_regs { |
| u32 irqenable1; |
| u32 irqenable2; |
| u32 wake_en; |
| u32 ctrl; |
| u32 oe; |
| u32 leveldetect0; |
| u32 leveldetect1; |
| u32 risingdetect; |
| u32 fallingdetect; |
| u32 dataout; |
| u32 debounce; |
| u32 debounce_en; |
| }; |
| |
| struct gpio_bank { |
| struct list_head node; |
| void __iomem *base; |
| u16 irq; |
| u32 non_wakeup_gpios; |
| u32 enabled_non_wakeup_gpios; |
| struct gpio_regs context; |
| u32 saved_datain; |
| u32 level_mask; |
| u32 toggle_mask; |
| spinlock_t lock; |
| struct gpio_chip chip; |
| struct clk *dbck; |
| u32 mod_usage; |
| u32 irq_usage; |
| u32 dbck_enable_mask; |
| bool dbck_enabled; |
| struct device *dev; |
| bool is_mpuio; |
| bool dbck_flag; |
| bool loses_context; |
| bool context_valid; |
| int stride; |
| u32 width; |
| int context_loss_count; |
| int power_mode; |
| bool workaround_enabled; |
| |
| void (*set_dataout)(struct gpio_bank *bank, int gpio, int enable); |
| int (*get_context_loss_count)(struct device *dev); |
| |
| struct omap_gpio_reg_offs *regs; |
| }; |
| |
| #define GPIO_INDEX(bank, gpio) (gpio % bank->width) |
| #define GPIO_BIT(bank, gpio) (BIT(GPIO_INDEX(bank, gpio))) |
| #define GPIO_MOD_CTRL_BIT BIT(0) |
| |
| #define BANK_USED(bank) (bank->mod_usage || bank->irq_usage) |
| #define LINE_USED(line, offset) (line & (BIT(offset))) |
| |
| static int irq_to_gpio(struct gpio_bank *bank, unsigned int gpio_irq) |
| { |
| return bank->chip.base + gpio_irq; |
| } |
| |
| static inline struct gpio_bank *_irq_data_get_bank(struct irq_data *d) |
| { |
| struct gpio_chip *chip = irq_data_get_irq_chip_data(d); |
| return container_of(chip, struct gpio_bank, chip); |
| } |
| |
| static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input) |
| { |
| void __iomem *reg = bank->base; |
| u32 l; |
| |
| reg += bank->regs->direction; |
| l = readl_relaxed(reg); |
| if (is_input) |
| l |= BIT(gpio); |
| else |
| l &= ~(BIT(gpio)); |
| writel_relaxed(l, reg); |
| bank->context.oe = l; |
| } |
| |
| |
| /* set data out value using dedicate set/clear register */ |
| static void _set_gpio_dataout_reg(struct gpio_bank *bank, int gpio, int enable) |
| { |
| void __iomem *reg = bank->base; |
| u32 l = GPIO_BIT(bank, gpio); |
| |
| if (enable) { |
| reg += bank->regs->set_dataout; |
| bank->context.dataout |= l; |
| } else { |
| reg += bank->regs->clr_dataout; |
| bank->context.dataout &= ~l; |
| } |
| |
| writel_relaxed(l, reg); |
| } |
| |
| /* set data out value using mask register */ |
| static void _set_gpio_dataout_mask(struct gpio_bank *bank, int gpio, int enable) |
| { |
| void __iomem *reg = bank->base + bank->regs->dataout; |
| u32 gpio_bit = GPIO_BIT(bank, gpio); |
| u32 l; |
| |
| l = readl_relaxed(reg); |
| if (enable) |
| l |= gpio_bit; |
| else |
| l &= ~gpio_bit; |
| writel_relaxed(l, reg); |
| bank->context.dataout = l; |
| } |
| |
| static int _get_gpio_datain(struct gpio_bank *bank, int offset) |
| { |
| void __iomem *reg = bank->base + bank->regs->datain; |
| |
| return (readl_relaxed(reg) & (BIT(offset))) != 0; |
| } |
| |
| static int _get_gpio_dataout(struct gpio_bank *bank, int offset) |
| { |
| void __iomem *reg = bank->base + bank->regs->dataout; |
| |
| return (readl_relaxed(reg) & (BIT(offset))) != 0; |
| } |
| |
| static inline void _gpio_rmw(void __iomem *base, u32 reg, u32 mask, bool set) |
| { |
| int l = readl_relaxed(base + reg); |
| |
| if (set) |
| l |= mask; |
| else |
| l &= ~mask; |
| |
| writel_relaxed(l, base + reg); |
| } |
| |
| static inline void _gpio_dbck_enable(struct gpio_bank *bank) |
| { |
| if (bank->dbck_enable_mask && !bank->dbck_enabled) { |
| clk_enable(bank->dbck); |
| bank->dbck_enabled = true; |
| |
| writel_relaxed(bank->dbck_enable_mask, |
| bank->base + bank->regs->debounce_en); |
| } |
| } |
| |
| static inline void _gpio_dbck_disable(struct gpio_bank *bank) |
| { |
| if (bank->dbck_enable_mask && bank->dbck_enabled) { |
| /* |
| * Disable debounce before cutting it's clock. If debounce is |
| * enabled but the clock is not, GPIO module seems to be unable |
| * to detect events and generate interrupts at least on OMAP3. |
| */ |
| writel_relaxed(0, bank->base + bank->regs->debounce_en); |
| |
| clk_disable(bank->dbck); |
| bank->dbck_enabled = false; |
| } |
| } |
| |
| /** |
| * _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; |
| 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 = GPIO_BIT(bank, gpio); |
| |
| clk_enable(bank->dbck); |
| reg = bank->base + bank->regs->debounce; |
| writel_relaxed(debounce, reg); |
| |
| reg = bank->base + bank->regs->debounce_en; |
| val = readl_relaxed(reg); |
| |
| if (debounce) |
| val |= l; |
| else |
| val &= ~l; |
| bank->dbck_enable_mask = val; |
| |
| writel_relaxed(val, reg); |
| clk_disable(bank->dbck); |
| /* |
| * Enable debounce clock per module. |
| * This call is mandatory because in omap_gpio_request() when |
| * *_runtime_get_sync() is called, _gpio_dbck_enable() within |
| * runtime callbck fails to turn on dbck because dbck_enable_mask |
| * used within _gpio_dbck_enable() is still not initialized at |
| * that point. Therefore we have to enable dbck here. |
| */ |
| _gpio_dbck_enable(bank); |
| if (bank->dbck_enable_mask) { |
| bank->context.debounce = debounce; |
| bank->context.debounce_en = val; |
| } |
| } |
| |
| /** |
| * _clear_gpio_debounce - clear debounce settings for a gpio |
| * @bank: the gpio bank we're acting upon |
| * @gpio: the gpio number on this @gpio |
| * |
| * If a gpio is using debounce, then clear the debounce enable bit and if |
| * this is the only gpio in this bank using debounce, then clear the debounce |
| * time too. The debounce clock will also be disabled when calling this function |
| * if this is the only gpio in the bank using debounce. |
| */ |
| static void _clear_gpio_debounce(struct gpio_bank *bank, unsigned gpio) |
| { |
| u32 gpio_bit = GPIO_BIT(bank, gpio); |
| |
| if (!bank->dbck_flag) |
| return; |
| |
| if (!(bank->dbck_enable_mask & gpio_bit)) |
| return; |
| |
| bank->dbck_enable_mask &= ~gpio_bit; |
| bank->context.debounce_en &= ~gpio_bit; |
| writel_relaxed(bank->context.debounce_en, |
| bank->base + bank->regs->debounce_en); |
| |
| if (!bank->dbck_enable_mask) { |
| bank->context.debounce = 0; |
| writel_relaxed(bank->context.debounce, bank->base + |
| bank->regs->debounce); |
| clk_disable(bank->dbck); |
| bank->dbck_enabled = false; |
| } |
| } |
| |
| static inline void set_gpio_trigger(struct gpio_bank *bank, int gpio, |
| unsigned trigger) |
| { |
| void __iomem *base = bank->base; |
| u32 gpio_bit = BIT(gpio); |
| |
| _gpio_rmw(base, bank->regs->leveldetect0, gpio_bit, |
| trigger & IRQ_TYPE_LEVEL_LOW); |
| _gpio_rmw(base, bank->regs->leveldetect1, gpio_bit, |
| trigger & IRQ_TYPE_LEVEL_HIGH); |
| _gpio_rmw(base, bank->regs->risingdetect, gpio_bit, |
| trigger & IRQ_TYPE_EDGE_RISING); |
| _gpio_rmw(base, bank->regs->fallingdetect, gpio_bit, |
| trigger & IRQ_TYPE_EDGE_FALLING); |
| |
| bank->context.leveldetect0 = |
| readl_relaxed(bank->base + bank->regs->leveldetect0); |
| bank->context.leveldetect1 = |
| readl_relaxed(bank->base + bank->regs->leveldetect1); |
| bank->context.risingdetect = |
| readl_relaxed(bank->base + bank->regs->risingdetect); |
| bank->context.fallingdetect = |
| readl_relaxed(bank->base + bank->regs->fallingdetect); |
| |
| if (likely(!(bank->non_wakeup_gpios & gpio_bit))) { |
| _gpio_rmw(base, bank->regs->wkup_en, gpio_bit, trigger != 0); |
| bank->context.wake_en = |
| readl_relaxed(bank->base + bank->regs->wkup_en); |
| } |
| |
| /* This part needs to be executed always for OMAP{34xx, 44xx} */ |
| if (!bank->regs->irqctrl) { |
| /* On omap24xx proceed only when valid GPIO bit is set */ |
| if (bank->non_wakeup_gpios) { |
| if (!(bank->non_wakeup_gpios & gpio_bit)) |
| goto exit; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| exit: |
| bank->level_mask = |
| readl_relaxed(bank->base + bank->regs->leveldetect0) | |
| readl_relaxed(bank->base + bank->regs->leveldetect1); |
| } |
| |
| #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; |
| |
| if (!bank->regs->irqctrl) |
| return; |
| |
| reg += bank->regs->irqctrl; |
| |
| l = readl_relaxed(reg); |
| if ((l >> gpio) & 1) |
| l &= ~(BIT(gpio)); |
| else |
| l |= BIT(gpio); |
| |
| writel_relaxed(l, reg); |
| } |
| #else |
| static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio) {} |
| #endif |
| |
| static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, |
| unsigned trigger) |
| { |
| void __iomem *reg = bank->base; |
| void __iomem *base = bank->base; |
| u32 l = 0; |
| |
| if (bank->regs->leveldetect0 && bank->regs->wkup_en) { |
| set_gpio_trigger(bank, gpio, trigger); |
| } else if (bank->regs->irqctrl) { |
| reg += bank->regs->irqctrl; |
| |
| l = readl_relaxed(reg); |
| if ((trigger & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) |
| bank->toggle_mask |= BIT(gpio); |
| if (trigger & IRQ_TYPE_EDGE_RISING) |
| l |= BIT(gpio); |
| else if (trigger & IRQ_TYPE_EDGE_FALLING) |
| l &= ~(BIT(gpio)); |
| else |
| return -EINVAL; |
| |
| writel_relaxed(l, reg); |
| } else if (bank->regs->edgectrl1) { |
| if (gpio & 0x08) |
| reg += bank->regs->edgectrl2; |
| else |
| reg += bank->regs->edgectrl1; |
| |
| gpio &= 0x07; |
| l = readl_relaxed(reg); |
| l &= ~(3 << (gpio << 1)); |
| if (trigger & IRQ_TYPE_EDGE_RISING) |
| l |= 2 << (gpio << 1); |
| if (trigger & IRQ_TYPE_EDGE_FALLING) |
| l |= BIT(gpio << 1); |
| |
| /* Enable wake-up during idle for dynamic tick */ |
| _gpio_rmw(base, bank->regs->wkup_en, BIT(gpio), trigger); |
| bank->context.wake_en = |
| readl_relaxed(bank->base + bank->regs->wkup_en); |
| writel_relaxed(l, reg); |
| } |
| return 0; |
| } |
| |
| static void _enable_gpio_module(struct gpio_bank *bank, unsigned offset) |
| { |
| if (bank->regs->pinctrl) { |
| void __iomem *reg = bank->base + bank->regs->pinctrl; |
| |
| /* Claim the pin for MPU */ |
| writel_relaxed(readl_relaxed(reg) | (BIT(offset)), reg); |
| } |
| |
| if (bank->regs->ctrl && !BANK_USED(bank)) { |
| void __iomem *reg = bank->base + bank->regs->ctrl; |
| u32 ctrl; |
| |
| ctrl = readl_relaxed(reg); |
| /* Module is enabled, clocks are not gated */ |
| ctrl &= ~GPIO_MOD_CTRL_BIT; |
| writel_relaxed(ctrl, reg); |
| bank->context.ctrl = ctrl; |
| } |
| } |
| |
| static void _disable_gpio_module(struct gpio_bank *bank, unsigned offset) |
| { |
| void __iomem *base = bank->base; |
| |
| if (bank->regs->wkup_en && |
| !LINE_USED(bank->mod_usage, offset) && |
| !LINE_USED(bank->irq_usage, offset)) { |
| /* Disable wake-up during idle for dynamic tick */ |
| _gpio_rmw(base, bank->regs->wkup_en, BIT(offset), 0); |
| bank->context.wake_en = |
| readl_relaxed(bank->base + bank->regs->wkup_en); |
| } |
| |
| if (bank->regs->ctrl && !BANK_USED(bank)) { |
| void __iomem *reg = bank->base + bank->regs->ctrl; |
| u32 ctrl; |
| |
| ctrl = readl_relaxed(reg); |
| /* Module is disabled, clocks are gated */ |
| ctrl |= GPIO_MOD_CTRL_BIT; |
| writel_relaxed(ctrl, reg); |
| bank->context.ctrl = ctrl; |
| } |
| } |
| |
| static int gpio_is_input(struct gpio_bank *bank, int mask) |
| { |
| void __iomem *reg = bank->base + bank->regs->direction; |
| |
| return readl_relaxed(reg) & mask; |
| } |
| |
| static int gpio_irq_type(struct irq_data *d, unsigned type) |
| { |
| struct gpio_bank *bank = _irq_data_get_bank(d); |
| unsigned gpio = 0; |
| int retval; |
| unsigned long flags; |
| unsigned offset; |
| |
| if (!BANK_USED(bank)) |
| pm_runtime_get_sync(bank->dev); |
| |
| #ifdef CONFIG_ARCH_OMAP1 |
| if (d->irq > IH_MPUIO_BASE) |
| gpio = OMAP_MPUIO(d->irq - IH_MPUIO_BASE); |
| #endif |
| |
| if (!gpio) |
| gpio = irq_to_gpio(bank, d->hwirq); |
| |
| if (type & ~IRQ_TYPE_SENSE_MASK) |
| return -EINVAL; |
| |
| if (!bank->regs->leveldetect0 && |
| (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH))) |
| return -EINVAL; |
| |
| spin_lock_irqsave(&bank->lock, flags); |
| offset = GPIO_INDEX(bank, gpio); |
| retval = _set_gpio_triggering(bank, offset, type); |
| if (!LINE_USED(bank->mod_usage, offset)) { |
| _enable_gpio_module(bank, offset); |
| _set_gpio_direction(bank, offset, 1); |
| } else if (!gpio_is_input(bank, BIT(offset))) { |
| spin_unlock_irqrestore(&bank->lock, flags); |
| return -EINVAL; |
| } |
| |
| bank->irq_usage |= BIT(GPIO_INDEX(bank, gpio)); |
| 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; |
| |
| reg += bank->regs->irqstatus; |
| writel_relaxed(gpio_mask, reg); |
| |
| /* Workaround for clearing DSP GPIO interrupts to allow retention */ |
| if (bank->regs->irqstatus2) { |
| reg = bank->base + bank->regs->irqstatus2; |
| writel_relaxed(gpio_mask, reg); |
| } |
| |
| /* Flush posted write for the irq status to avoid spurious interrupts */ |
| readl_relaxed(reg); |
| } |
| |
| static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio) |
| { |
| _clear_gpio_irqbank(bank, GPIO_BIT(bank, gpio)); |
| } |
| |
| static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank) |
| { |
| void __iomem *reg = bank->base; |
| u32 l; |
| u32 mask = (BIT(bank->width)) - 1; |
| |
| reg += bank->regs->irqenable; |
| l = readl_relaxed(reg); |
| if (bank->regs->irqenable_inv) |
| l = ~l; |
| l &= mask; |
| return l; |
| } |
| |
| static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask) |
| { |
| void __iomem *reg = bank->base; |
| u32 l; |
| |
| if (bank->regs->set_irqenable) { |
| reg += bank->regs->set_irqenable; |
| l = gpio_mask; |
| bank->context.irqenable1 |= gpio_mask; |
| } else { |
| reg += bank->regs->irqenable; |
| l = readl_relaxed(reg); |
| if (bank->regs->irqenable_inv) |
| l &= ~gpio_mask; |
| else |
| l |= gpio_mask; |
| bank->context.irqenable1 = l; |
| } |
| |
| writel_relaxed(l, reg); |
| } |
| |
| static void _disable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask) |
| { |
| void __iomem *reg = bank->base; |
| u32 l; |
| |
| if (bank->regs->clr_irqenable) { |
| reg += bank->regs->clr_irqenable; |
| l = gpio_mask; |
| bank->context.irqenable1 &= ~gpio_mask; |
| } else { |
| reg += bank->regs->irqenable; |
| l = readl_relaxed(reg); |
| if (bank->regs->irqenable_inv) |
| l |= gpio_mask; |
| else |
| l &= ~gpio_mask; |
| bank->context.irqenable1 = l; |
| } |
| |
| writel_relaxed(l, reg); |
| } |
| |
| static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable) |
| { |
| if (enable) |
| _enable_gpio_irqbank(bank, GPIO_BIT(bank, gpio)); |
| else |
| _disable_gpio_irqbank(bank, GPIO_BIT(bank, gpio)); |
| } |
| |
| /* |
| * 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) |
| { |
| u32 gpio_bit = GPIO_BIT(bank, gpio); |
| unsigned long flags; |
| |
| if (bank->non_wakeup_gpios & gpio_bit) { |
| dev_err(bank->dev, |
| "Unable to modify wakeup on non-wakeup GPIO%d\n", gpio); |
| return -EINVAL; |
| } |
| |
| spin_lock_irqsave(&bank->lock, flags); |
| if (enable) |
| bank->context.wake_en |= gpio_bit; |
| else |
| bank->context.wake_en &= ~gpio_bit; |
| |
| writel_relaxed(bank->context.wake_en, bank->base + bank->regs->wkup_en); |
| spin_unlock_irqrestore(&bank->lock, flags); |
| |
| return 0; |
| } |
| |
| static void _reset_gpio(struct gpio_bank *bank, int gpio) |
| { |
| _set_gpio_direction(bank, GPIO_INDEX(bank, gpio), 1); |
| _set_gpio_irqenable(bank, gpio, 0); |
| _clear_gpio_irqstatus(bank, gpio); |
| _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE); |
| _clear_gpio_debounce(bank, gpio); |
| } |
| |
| /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */ |
| static int gpio_wake_enable(struct irq_data *d, unsigned int enable) |
| { |
| struct gpio_bank *bank = _irq_data_get_bank(d); |
| unsigned int gpio = irq_to_gpio(bank, d->hwirq); |
| |
| return _set_gpio_wakeup(bank, gpio, enable); |
| } |
| |
| 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; |
| |
| /* |
| * If this is the first gpio_request for the bank, |
| * enable the bank module. |
| */ |
| if (!BANK_USED(bank)) |
| pm_runtime_get_sync(bank->dev); |
| |
| spin_lock_irqsave(&bank->lock, flags); |
| /* Set trigger to none. You need to enable the desired trigger with |
| * request_irq() or set_irq_type(). Only do this if the IRQ line has |
| * not already been requested. |
| */ |
| if (!LINE_USED(bank->irq_usage, offset)) { |
| _set_gpio_triggering(bank, offset, IRQ_TYPE_NONE); |
| _enable_gpio_module(bank, offset); |
| } |
| bank->mod_usage |= BIT(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); |
| bank->mod_usage &= ~(BIT(offset)); |
| _disable_gpio_module(bank, offset); |
| _reset_gpio(bank, bank->chip.base + offset); |
| spin_unlock_irqrestore(&bank->lock, flags); |
| |
| /* |
| * If this is the last gpio to be freed in the bank, |
| * disable the bank module. |
| */ |
| if (!BANK_USED(bank)) |
| pm_runtime_put(bank->dev); |
| } |
| |
| /* |
| * 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 bit; |
| struct gpio_bank *bank; |
| int unmasked = 0; |
| struct irq_chip *irqchip = irq_desc_get_chip(desc); |
| struct gpio_chip *chip = irq_get_handler_data(irq); |
| |
| chained_irq_enter(irqchip, desc); |
| |
| bank = container_of(chip, struct gpio_bank, chip); |
| isr_reg = bank->base + bank->regs->irqstatus; |
| pm_runtime_get_sync(bank->dev); |
| |
| 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 = readl_relaxed(isr_reg) & enabled; |
| |
| if (bank->level_mask) |
| 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 */ |
| _disable_gpio_irqbank(bank, isr_saved & ~level_mask); |
| _clear_gpio_irqbank(bank, isr_saved & ~level_mask); |
| _enable_gpio_irqbank(bank, isr_saved & ~level_mask); |
| |
| /* 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(irqchip, desc); |
| } |
| |
| if (!isr) |
| break; |
| |
| while (isr) { |
| bit = __ffs(isr); |
| isr &= ~(BIT(bit)); |
| |
| /* |
| * 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 & (BIT(bit))) |
| _toggle_gpio_edge_triggering(bank, bit); |
| |
| generic_handle_irq(irq_find_mapping(bank->chip.irqdomain, |
| bit)); |
| } |
| } |
| /* 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(irqchip, desc); |
| pm_runtime_put(bank->dev); |
| } |
| |
| static void gpio_irq_shutdown(struct irq_data *d) |
| { |
| struct gpio_bank *bank = _irq_data_get_bank(d); |
| unsigned int gpio = irq_to_gpio(bank, d->hwirq); |
| unsigned long flags; |
| unsigned offset = GPIO_INDEX(bank, gpio); |
| |
| spin_lock_irqsave(&bank->lock, flags); |
| gpio_unlock_as_irq(&bank->chip, offset); |
| bank->irq_usage &= ~(BIT(offset)); |
| _disable_gpio_module(bank, offset); |
| _reset_gpio(bank, gpio); |
| spin_unlock_irqrestore(&bank->lock, flags); |
| |
| /* |
| * If this is the last IRQ to be freed in the bank, |
| * disable the bank module. |
| */ |
| if (!BANK_USED(bank)) |
| pm_runtime_put(bank->dev); |
| } |
| |
| static void gpio_ack_irq(struct irq_data *d) |
| { |
| struct gpio_bank *bank = _irq_data_get_bank(d); |
| unsigned int gpio = irq_to_gpio(bank, d->hwirq); |
| |
| _clear_gpio_irqstatus(bank, gpio); |
| } |
| |
| static void gpio_mask_irq(struct irq_data *d) |
| { |
| struct gpio_bank *bank = _irq_data_get_bank(d); |
| unsigned int gpio = irq_to_gpio(bank, d->hwirq); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&bank->lock, flags); |
| _set_gpio_irqenable(bank, gpio, 0); |
| _set_gpio_triggering(bank, GPIO_INDEX(bank, gpio), IRQ_TYPE_NONE); |
| spin_unlock_irqrestore(&bank->lock, flags); |
| } |
| |
| static void gpio_unmask_irq(struct irq_data *d) |
| { |
| struct gpio_bank *bank = _irq_data_get_bank(d); |
| unsigned int gpio = irq_to_gpio(bank, d->hwirq); |
| unsigned int irq_mask = GPIO_BIT(bank, gpio); |
| u32 trigger = irqd_get_trigger_type(d); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&bank->lock, flags); |
| if (trigger) |
| _set_gpio_triggering(bank, GPIO_INDEX(bank, 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, |
| }; |
| |
| /*---------------------------------------------------------------------*/ |
| |
| 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); |
| writel_relaxed(0xffff & ~bank->context.wake_en, 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); |
| writel_relaxed(bank->context.wake_en, 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(struct gpio_bank *bank) |
| { |
| platform_set_drvdata(&omap_mpuio_device, bank); |
| |
| if (platform_driver_register(&omap_mpuio_driver) == 0) |
| (void) platform_device_register(&omap_mpuio_device); |
| } |
| |
| /*---------------------------------------------------------------------*/ |
| |
| static int gpio_get_direction(struct gpio_chip *chip, unsigned offset) |
| { |
| struct gpio_bank *bank; |
| unsigned long flags; |
| void __iomem *reg; |
| int dir; |
| |
| bank = container_of(chip, struct gpio_bank, chip); |
| reg = bank->base + bank->regs->direction; |
| spin_lock_irqsave(&bank->lock, flags); |
| dir = !!(readl_relaxed(reg) & BIT(offset)); |
| spin_unlock_irqrestore(&bank->lock, flags); |
| return dir; |
| } |
| |
| 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_get(struct gpio_chip *chip, unsigned offset) |
| { |
| struct gpio_bank *bank; |
| u32 mask; |
| |
| bank = container_of(chip, struct gpio_bank, chip); |
| mask = (BIT(offset)); |
| |
| if (gpio_is_input(bank, mask)) |
| return _get_gpio_datain(bank, offset); |
| else |
| return _get_gpio_dataout(bank, offset); |
| } |
| |
| 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); |
| bank->set_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); |
| |
| 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); |
| bank->set_dataout(bank, offset, value); |
| spin_unlock_irqrestore(&bank->lock, flags); |
| } |
| |
| /*---------------------------------------------------------------------*/ |
| |
| static void __init omap_gpio_show_rev(struct gpio_bank *bank) |
| { |
| static bool called; |
| u32 rev; |
| |
| if (called || bank->regs->revision == USHRT_MAX) |
| return; |
| |
| rev = readw_relaxed(bank->base + bank->regs->revision); |
| pr_info("OMAP GPIO hardware version %d.%d\n", |
| (rev >> 4) & 0x0f, rev & 0x0f); |
| |
| called = true; |
| } |
| |
| /* 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 void omap_gpio_mod_init(struct gpio_bank *bank) |
| { |
| void __iomem *base = bank->base; |
| u32 l = 0xffffffff; |
| |
| if (bank->width == 16) |
| l = 0xffff; |
| |
| if (bank->is_mpuio) { |
| writel_relaxed(l, bank->base + bank->regs->irqenable); |
| return; |
| } |
| |
| _gpio_rmw(base, bank->regs->irqenable, l, bank->regs->irqenable_inv); |
| _gpio_rmw(base, bank->regs->irqstatus, l, !bank->regs->irqenable_inv); |
| if (bank->regs->debounce_en) |
| writel_relaxed(0, base + bank->regs->debounce_en); |
| |
| /* Save OE default value (0xffffffff) in the context */ |
| bank->context.oe = readl_relaxed(bank->base + bank->regs->direction); |
| /* Initialize interface clk ungated, module enabled */ |
| if (bank->regs->ctrl) |
| writel_relaxed(0, base + bank->regs->ctrl); |
| |
| bank->dbck = clk_get(bank->dev, "dbclk"); |
| if (IS_ERR(bank->dbck)) |
| dev_err(bank->dev, "Could not get gpio dbck\n"); |
| } |
| |
| static void |
| omap_mpuio_alloc_gc(struct gpio_bank *bank, unsigned int irq_start, |
| unsigned int num) |
| { |
| struct irq_chip_generic *gc; |
| struct irq_chip_type *ct; |
| |
| gc = irq_alloc_generic_chip("MPUIO", 1, irq_start, bank->base, |
| handle_simple_irq); |
| if (!gc) { |
| dev_err(bank->dev, "Memory alloc failed for gc\n"); |
| return; |
| } |
| |
| ct = gc->chip_types; |
| |
| /* NOTE: No ack required, reading IRQ status clears it. */ |
| ct->chip.irq_mask = irq_gc_mask_set_bit; |
| ct->chip.irq_unmask = irq_gc_mask_clr_bit; |
| ct->chip.irq_set_type = gpio_irq_type; |
| |
| if (bank->regs->wkup_en) |
| ct->chip.irq_set_wake = gpio_wake_enable; |
| |
| ct->regs.mask = OMAP_MPUIO_GPIO_INT / bank->stride; |
| irq_setup_generic_chip(gc, IRQ_MSK(num), IRQ_GC_INIT_MASK_CACHE, |
| IRQ_NOREQUEST | IRQ_NOPROBE, 0); |
| } |
| |
| static int omap_gpio_chip_init(struct gpio_bank *bank) |
| { |
| int j; |
| static int gpio; |
| int irq_base = 0; |
| int ret; |
| |
| /* |
| * 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.get_direction = gpio_get_direction; |
| 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; |
| if (bank->is_mpuio) { |
| bank->chip.label = "mpuio"; |
| if (bank->regs->wkup_en) |
| bank->chip.dev = &omap_mpuio_device.dev; |
| bank->chip.base = OMAP_MPUIO(0); |
| } else { |
| bank->chip.label = "gpio"; |
| bank->chip.base = gpio; |
| gpio += bank->width; |
| } |
| bank->chip.ngpio = bank->width; |
| |
| ret = gpiochip_add(&bank->chip); |
| if (ret) { |
| dev_err(bank->dev, "Could not register gpio chip %d\n", ret); |
| return ret; |
| } |
| |
| #ifdef CONFIG_ARCH_OMAP1 |
| /* |
| * REVISIT: Once we have OMAP1 supporting SPARSE_IRQ, we can drop |
| * irq_alloc_descs() since a base IRQ offset will no longer be needed. |
| */ |
| irq_base = irq_alloc_descs(-1, 0, bank->width, 0); |
| if (irq_base < 0) { |
| dev_err(bank->dev, "Couldn't allocate IRQ numbers\n"); |
| return -ENODEV; |
| } |
| #endif |
| |
| ret = gpiochip_irqchip_add(&bank->chip, &gpio_irq_chip, |
| irq_base, gpio_irq_handler, |
| IRQ_TYPE_NONE); |
| |
| if (ret) { |
| dev_err(bank->dev, "Couldn't add irqchip to gpiochip %d\n", ret); |
| ret = gpiochip_remove(&bank->chip); |
| return -ENODEV; |
| } |
| |
| gpiochip_set_chained_irqchip(&bank->chip, &gpio_irq_chip, |
| bank->irq, gpio_irq_handler); |
| |
| for (j = 0; j < bank->width; j++) { |
| int irq = irq_find_mapping(bank->chip.irqdomain, j); |
| irq_set_lockdep_class(irq, &gpio_lock_class); |
| if (bank->is_mpuio) { |
| omap_mpuio_alloc_gc(bank, irq, bank->width); |
| irq_set_chip_and_handler(irq, NULL, NULL); |
| set_irq_flags(irq, 0); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static const struct of_device_id omap_gpio_match[]; |
| |
| static int omap_gpio_probe(struct platform_device *pdev) |
| { |
| struct device *dev = &pdev->dev; |
| struct device_node *node = dev->of_node; |
| const struct of_device_id *match; |
| const struct omap_gpio_platform_data *pdata; |
| struct resource *res; |
| struct gpio_bank *bank; |
| int ret; |
| |
| match = of_match_device(of_match_ptr(omap_gpio_match), dev); |
| |
| pdata = match ? match->data : dev_get_platdata(dev); |
| if (!pdata) |
| return -EINVAL; |
| |
| bank = devm_kzalloc(dev, sizeof(struct gpio_bank), GFP_KERNEL); |
| if (!bank) { |
| dev_err(dev, "Memory alloc failed\n"); |
| return -ENOMEM; |
| } |
| |
| res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); |
| if (unlikely(!res)) { |
| dev_err(dev, "Invalid IRQ resource\n"); |
| return -ENODEV; |
| } |
| |
| bank->irq = res->start; |
| bank->dev = dev; |
| bank->chip.dev = dev; |
| bank->dbck_flag = pdata->dbck_flag; |
| bank->stride = pdata->bank_stride; |
| bank->width = pdata->bank_width; |
| bank->is_mpuio = pdata->is_mpuio; |
| bank->non_wakeup_gpios = pdata->non_wakeup_gpios; |
| bank->regs = pdata->regs; |
| #ifdef CONFIG_OF_GPIO |
| bank->chip.of_node = of_node_get(node); |
| #endif |
| if (node) { |
| if (!of_property_read_bool(node, "ti,gpio-always-on")) |
| bank->loses_context = true; |
| } else { |
| bank->loses_context = pdata->loses_context; |
| |
| if (bank->loses_context) |
| bank->get_context_loss_count = |
| pdata->get_context_loss_count; |
| } |
| |
| if (bank->regs->set_dataout && bank->regs->clr_dataout) |
| bank->set_dataout = _set_gpio_dataout_reg; |
| else |
| bank->set_dataout = _set_gpio_dataout_mask; |
| |
| spin_lock_init(&bank->lock); |
| |
| /* Static mapping, never released */ |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| bank->base = devm_ioremap_resource(dev, res); |
| if (IS_ERR(bank->base)) { |
| irq_domain_remove(bank->chip.irqdomain); |
| return PTR_ERR(bank->base); |
| } |
| |
| platform_set_drvdata(pdev, bank); |
| |
| pm_runtime_enable(bank->dev); |
| pm_runtime_irq_safe(bank->dev); |
| pm_runtime_get_sync(bank->dev); |
| |
| if (bank->is_mpuio) |
| mpuio_init(bank); |
| |
| omap_gpio_mod_init(bank); |
| |
| ret = omap_gpio_chip_init(bank); |
| if (ret) |
| return ret; |
| |
| omap_gpio_show_rev(bank); |
| |
| pm_runtime_put(bank->dev); |
| |
| list_add_tail(&bank->node, &omap_gpio_list); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_ARCH_OMAP2PLUS |
| |
| #if defined(CONFIG_PM_RUNTIME) |
| static void omap_gpio_restore_context(struct gpio_bank *bank); |
| |
| static int omap_gpio_runtime_suspend(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct gpio_bank *bank = platform_get_drvdata(pdev); |
| u32 l1 = 0, l2 = 0; |
| unsigned long flags; |
| u32 wake_low, wake_hi; |
| |
| spin_lock_irqsave(&bank->lock, flags); |
| |
| /* |
| * Only edges can generate a wakeup event to the PRCM. |
| * |
| * Therefore, ensure any wake-up capable GPIOs have |
| * edge-detection enabled before going idle to ensure a wakeup |
| * to the PRCM is generated on a GPIO transition. (c.f. 34xx |
| * NDA TRM 25.5.3.1) |
| * |
| * The normal values will be restored upon ->runtime_resume() |
| * by writing back the values saved in bank->context. |
| */ |
| wake_low = bank->context.leveldetect0 & bank->context.wake_en; |
| if (wake_low) |
| writel_relaxed(wake_low | bank->context.fallingdetect, |
| bank->base + bank->regs->fallingdetect); |
| wake_hi = bank->context.leveldetect1 & bank->context.wake_en; |
| if (wake_hi) |
| writel_relaxed(wake_hi | bank->context.risingdetect, |
| bank->base + bank->regs->risingdetect); |
| |
| if (!bank->enabled_non_wakeup_gpios) |
| goto update_gpio_context_count; |
| |
| if (bank->power_mode != OFF_MODE) { |
| bank->power_mode = 0; |
| goto update_gpio_context_count; |
| } |
| /* |
| * If going to OFF, remove triggering for all |
| * non-wakeup GPIOs. Otherwise spurious IRQs will be |
| * generated. See OMAP2420 Errata item 1.101. |
| */ |
| bank->saved_datain = readl_relaxed(bank->base + |
| bank->regs->datain); |
| l1 = bank->context.fallingdetect; |
| l2 = bank->context.risingdetect; |
| |
| l1 &= ~bank->enabled_non_wakeup_gpios; |
| l2 &= ~bank->enabled_non_wakeup_gpios; |
| |
| writel_relaxed(l1, bank->base + bank->regs->fallingdetect); |
| writel_relaxed(l2, bank->base + bank->regs->risingdetect); |
| |
| bank->workaround_enabled = true; |
| |
| update_gpio_context_count: |
| if (bank->get_context_loss_count) |
| bank->context_loss_count = |
| bank->get_context_loss_count(bank->dev); |
| |
| _gpio_dbck_disable(bank); |
| spin_unlock_irqrestore(&bank->lock, flags); |
| |
| return 0; |
| } |
| |
| static void omap_gpio_init_context(struct gpio_bank *p); |
| |
| static int omap_gpio_runtime_resume(struct device *dev) |
| { |
| struct platform_device *pdev = to_platform_device(dev); |
| struct gpio_bank *bank = platform_get_drvdata(pdev); |
| u32 l = 0, gen, gen0, gen1; |
| unsigned long flags; |
| int c; |
| |
| spin_lock_irqsave(&bank->lock, flags); |
| |
| /* |
| * On the first resume during the probe, the context has not |
| * been initialised and so initialise it now. Also initialise |
| * the context loss count. |
| */ |
| if (bank->loses_context && !bank->context_valid) { |
| omap_gpio_init_context(bank); |
| |
| if (bank->get_context_loss_count) |
| bank->context_loss_count = |
| bank->get_context_loss_count(bank->dev); |
| } |
| |
| _gpio_dbck_enable(bank); |
| |
| /* |
| * In ->runtime_suspend(), level-triggered, wakeup-enabled |
| * GPIOs were set to edge trigger also in order to be able to |
| * generate a PRCM wakeup. Here we restore the |
| * pre-runtime_suspend() values for edge triggering. |
| */ |
| writel_relaxed(bank->context.fallingdetect, |
| bank->base + bank->regs->fallingdetect); |
| writel_relaxed(bank->context.risingdetect, |
| bank->base + bank->regs->risingdetect); |
| |
| if (bank->loses_context) { |
| if (!bank->get_context_loss_count) { |
| omap_gpio_restore_context(bank); |
| } else { |
| c = bank->get_context_loss_count(bank->dev); |
| if (c != bank->context_loss_count) { |
| omap_gpio_restore_context(bank); |
| } else { |
| spin_unlock_irqrestore(&bank->lock, flags); |
| return 0; |
| } |
| } |
| } |
| |
| if (!bank->workaround_enabled) { |
| spin_unlock_irqrestore(&bank->lock, flags); |
| return 0; |
| } |
| |
| l = readl_relaxed(bank->base + bank->regs->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->context.fallingdetect; |
| gen0 &= bank->saved_datain; |
| |
| gen1 = l & bank->context.risingdetect; |
| gen1 &= ~(bank->saved_datain); |
| |
| /* FIXME: Consider GPIO IRQs with level detections properly! */ |
| gen = l & (~(bank->context.fallingdetect) & |
| ~(bank->context.risingdetect)); |
| /* Consider all GPIO IRQs needed to be updated */ |
| gen |= gen0 | gen1; |
| |
| if (gen) { |
| u32 old0, old1; |
| |
| old0 = readl_relaxed(bank->base + bank->regs->leveldetect0); |
| old1 = readl_relaxed(bank->base + bank->regs->leveldetect1); |
| |
| if (!bank->regs->irqstatus_raw0) { |
| writel_relaxed(old0 | gen, bank->base + |
| bank->regs->leveldetect0); |
| writel_relaxed(old1 | gen, bank->base + |
| bank->regs->leveldetect1); |
| } |
| |
| if (bank->regs->irqstatus_raw0) { |
| writel_relaxed(old0 | l, bank->base + |
| bank->regs->leveldetect0); |
| writel_relaxed(old1 | l, bank->base + |
| bank->regs->leveldetect1); |
| } |
| writel_relaxed(old0, bank->base + bank->regs->leveldetect0); |
| writel_relaxed(old1, bank->base + bank->regs->leveldetect1); |
| } |
| |
| bank->workaround_enabled = false; |
| spin_unlock_irqrestore(&bank->lock, flags); |
| |
| return 0; |
| } |
| #endif /* CONFIG_PM_RUNTIME */ |
| |
| void omap2_gpio_prepare_for_idle(int pwr_mode) |
| { |
| struct gpio_bank *bank; |
| |
| list_for_each_entry(bank, &omap_gpio_list, node) { |
| if (!BANK_USED(bank) || !bank->loses_context) |
| continue; |
| |
| bank->power_mode = pwr_mode; |
| |
| pm_runtime_put_sync_suspend(bank->dev); |
| } |
| } |
| |
| void omap2_gpio_resume_after_idle(void) |
| { |
| struct gpio_bank *bank; |
| |
| list_for_each_entry(bank, &omap_gpio_list, node) { |
| if (!BANK_USED(bank) || !bank->loses_context) |
| continue; |
| |
| pm_runtime_get_sync(bank->dev); |
| } |
| } |
| |
| #if defined(CONFIG_PM_RUNTIME) |
| static void omap_gpio_init_context(struct gpio_bank *p) |
| { |
| struct omap_gpio_reg_offs *regs = p->regs; |
| void __iomem *base = p->base; |
| |
| p->context.ctrl = readl_relaxed(base + regs->ctrl); |
| p->context.oe = readl_relaxed(base + regs->direction); |
| p->context.wake_en = readl_relaxed(base + regs->wkup_en); |
| p->context.leveldetect0 = readl_relaxed(base + regs->leveldetect0); |
| p->context.leveldetect1 = readl_relaxed(base + regs->leveldetect1); |
| p->context.risingdetect = readl_relaxed(base + regs->risingdetect); |
| p->context.fallingdetect = readl_relaxed(base + regs->fallingdetect); |
| p->context.irqenable1 = readl_relaxed(base + regs->irqenable); |
| p->context.irqenable2 = readl_relaxed(base + regs->irqenable2); |
| |
| if (regs->set_dataout && p->regs->clr_dataout) |
| p->context.dataout = readl_relaxed(base + regs->set_dataout); |
| else |
| p->context.dataout = readl_relaxed(base + regs->dataout); |
| |
| p->context_valid = true; |
| } |
| |
| static void omap_gpio_restore_context(struct gpio_bank *bank) |
| { |
| writel_relaxed(bank->context.wake_en, |
| bank->base + bank->regs->wkup_en); |
| writel_relaxed(bank->context.ctrl, bank->base + bank->regs->ctrl); |
| writel_relaxed(bank->context.leveldetect0, |
| bank->base + bank->regs->leveldetect0); |
| writel_relaxed(bank->context.leveldetect1, |
| bank->base + bank->regs->leveldetect1); |
| writel_relaxed(bank->context.risingdetect, |
| bank->base + bank->regs->risingdetect); |
| writel_relaxed(bank->context.fallingdetect, |
| bank->base + bank->regs->fallingdetect); |
| if (bank->regs->set_dataout && bank->regs->clr_dataout) |
| writel_relaxed(bank->context.dataout, |
| bank->base + bank->regs->set_dataout); |
| else |
| writel_relaxed(bank->context.dataout, |
| bank->base + bank->regs->dataout); |
| writel_relaxed(bank->context.oe, bank->base + bank->regs->direction); |
| |
| if (bank->dbck_enable_mask) { |
| writel_relaxed(bank->context.debounce, bank->base + |
| bank->regs->debounce); |
| writel_relaxed(bank->context.debounce_en, |
| bank->base + bank->regs->debounce_en); |
| } |
| |
| writel_relaxed(bank->context.irqenable1, |
| bank->base + bank->regs->irqenable); |
| writel_relaxed(bank->context.irqenable2, |
| bank->base + bank->regs->irqenable2); |
| } |
| #endif /* CONFIG_PM_RUNTIME */ |
| #else |
| #define omap_gpio_runtime_suspend NULL |
| #define omap_gpio_runtime_resume NULL |
| static inline void omap_gpio_init_context(struct gpio_bank *p) {} |
| #endif |
| |
| static const struct dev_pm_ops gpio_pm_ops = { |
| SET_RUNTIME_PM_OPS(omap_gpio_runtime_suspend, omap_gpio_runtime_resume, |
| NULL) |
| }; |
| |
| #if defined(CONFIG_OF) |
| static struct omap_gpio_reg_offs omap2_gpio_regs = { |
| .revision = OMAP24XX_GPIO_REVISION, |
| .direction = OMAP24XX_GPIO_OE, |
| .datain = OMAP24XX_GPIO_DATAIN, |
| .dataout = OMAP24XX_GPIO_DATAOUT, |
| .set_dataout = OMAP24XX_GPIO_SETDATAOUT, |
| .clr_dataout = OMAP24XX_GPIO_CLEARDATAOUT, |
| .irqstatus = OMAP24XX_GPIO_IRQSTATUS1, |
| .irqstatus2 = OMAP24XX_GPIO_IRQSTATUS2, |
| .irqenable = OMAP24XX_GPIO_IRQENABLE1, |
| .irqenable2 = OMAP24XX_GPIO_IRQENABLE2, |
| .set_irqenable = OMAP24XX_GPIO_SETIRQENABLE1, |
| .clr_irqenable = OMAP24XX_GPIO_CLEARIRQENABLE1, |
| .debounce = OMAP24XX_GPIO_DEBOUNCE_VAL, |
| .debounce_en = OMAP24XX_GPIO_DEBOUNCE_EN, |
| .ctrl = OMAP24XX_GPIO_CTRL, |
| .wkup_en = OMAP24XX_GPIO_WAKE_EN, |
| .leveldetect0 = OMAP24XX_GPIO_LEVELDETECT0, |
| .leveldetect1 = OMAP24XX_GPIO_LEVELDETECT1, |
| .risingdetect = OMAP24XX_GPIO_RISINGDETECT, |
| .fallingdetect = OMAP24XX_GPIO_FALLINGDETECT, |
| }; |
| |
| static struct omap_gpio_reg_offs omap4_gpio_regs = { |
| .revision = OMAP4_GPIO_REVISION, |
| .direction = OMAP4_GPIO_OE, |
| .datain = OMAP4_GPIO_DATAIN, |
| .dataout = OMAP4_GPIO_DATAOUT, |
| .set_dataout = OMAP4_GPIO_SETDATAOUT, |
| .clr_dataout = OMAP4_GPIO_CLEARDATAOUT, |
| .irqstatus = OMAP4_GPIO_IRQSTATUS0, |
| .irqstatus2 = OMAP4_GPIO_IRQSTATUS1, |
| .irqenable = OMAP4_GPIO_IRQSTATUSSET0, |
| .irqenable2 = OMAP4_GPIO_IRQSTATUSSET1, |
| .set_irqenable = OMAP4_GPIO_IRQSTATUSSET0, |
| .clr_irqenable = OMAP4_GPIO_IRQSTATUSCLR0, |
| .debounce = OMAP4_GPIO_DEBOUNCINGTIME, |
| .debounce_en = OMAP4_GPIO_DEBOUNCENABLE, |
| .ctrl = OMAP4_GPIO_CTRL, |
| .wkup_en = OMAP4_GPIO_IRQWAKEN0, |
| .leveldetect0 = OMAP4_GPIO_LEVELDETECT0, |
| .leveldetect1 = OMAP4_GPIO_LEVELDETECT1, |
| .risingdetect = OMAP4_GPIO_RISINGDETECT, |
| .fallingdetect = OMAP4_GPIO_FALLINGDETECT, |
| }; |
| |
| static const struct omap_gpio_platform_data omap2_pdata = { |
| .regs = &omap2_gpio_regs, |
| .bank_width = 32, |
| .dbck_flag = false, |
| }; |
| |
| static const struct omap_gpio_platform_data omap3_pdata = { |
| .regs = &omap2_gpio_regs, |
| .bank_width = 32, |
| .dbck_flag = true, |
| }; |
| |
| static const struct omap_gpio_platform_data omap4_pdata = { |
| .regs = &omap4_gpio_regs, |
| .bank_width = 32, |
| .dbck_flag = true, |
| }; |
| |
| static const struct of_device_id omap_gpio_match[] = { |
| { |
| .compatible = "ti,omap4-gpio", |
| .data = &omap4_pdata, |
| }, |
| { |
| .compatible = "ti,omap3-gpio", |
| .data = &omap3_pdata, |
| }, |
| { |
| .compatible = "ti,omap2-gpio", |
| .data = &omap2_pdata, |
| }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(of, omap_gpio_match); |
| #endif |
| |
| static struct platform_driver omap_gpio_driver = { |
| .probe = omap_gpio_probe, |
| .driver = { |
| .name = "omap_gpio", |
| .pm = &gpio_pm_ops, |
| .of_match_table = of_match_ptr(omap_gpio_match), |
| }, |
| }; |
| |
| /* |
| * 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); |