/* * Generic GPIO driver for logic cells found in the Nomadik SoC * * Copyright (C) 2008,2009 STMicroelectronics * Copyright (C) 2009 Alessandro Rubini * Rewritten based on work by Prafulla WADASKAR * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * The GPIO module in the Nomadik family of Systems-on-Chip is an * AMBA device, managing 32 pins and alternate functions. The logic block * is currently only used in the Nomadik. * * Symbols in this file are called "nmk_gpio" for "nomadik gpio" */ #define NMK_GPIO_PER_CHIP 32 struct nmk_gpio_chip { struct gpio_chip chip; void __iomem *addr; struct clk *clk; unsigned int parent_irq; spinlock_t lock; /* Keep track of configured edges */ u32 edge_rising; u32 edge_falling; }; static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip, unsigned offset, int gpio_mode) { u32 bit = 1 << offset; u32 afunc, bfunc; afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & ~bit; bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & ~bit; if (gpio_mode & NMK_GPIO_ALT_A) afunc |= bit; if (gpio_mode & NMK_GPIO_ALT_B) bfunc |= bit; writel(afunc, nmk_chip->addr + NMK_GPIO_AFSLA); writel(bfunc, nmk_chip->addr + NMK_GPIO_AFSLB); } static void __nmk_gpio_set_slpm(struct nmk_gpio_chip *nmk_chip, unsigned offset, enum nmk_gpio_slpm mode) { u32 bit = 1 << offset; u32 slpm; slpm = readl(nmk_chip->addr + NMK_GPIO_SLPC); if (mode == NMK_GPIO_SLPM_NOCHANGE) slpm |= bit; else slpm &= ~bit; writel(slpm, nmk_chip->addr + NMK_GPIO_SLPC); } static void __nmk_gpio_set_pull(struct nmk_gpio_chip *nmk_chip, unsigned offset, enum nmk_gpio_pull pull) { u32 bit = 1 << offset; u32 pdis; pdis = readl(nmk_chip->addr + NMK_GPIO_PDIS); if (pull == NMK_GPIO_PULL_NONE) pdis |= bit; else pdis &= ~bit; writel(pdis, nmk_chip->addr + NMK_GPIO_PDIS); if (pull == NMK_GPIO_PULL_UP) writel(bit, nmk_chip->addr + NMK_GPIO_DATS); else if (pull == NMK_GPIO_PULL_DOWN) writel(bit, nmk_chip->addr + NMK_GPIO_DATC); } static void __nmk_gpio_make_input(struct nmk_gpio_chip *nmk_chip, unsigned offset) { writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC); } static void __nmk_gpio_set_output(struct nmk_gpio_chip *nmk_chip, unsigned offset, int val) { if (val) writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATS); else writel(1 << offset, nmk_chip->addr + NMK_GPIO_DATC); } static void __nmk_gpio_make_output(struct nmk_gpio_chip *nmk_chip, unsigned offset, int val) { writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRS); __nmk_gpio_set_output(nmk_chip, offset, val); } static void __nmk_config_pin(struct nmk_gpio_chip *nmk_chip, unsigned offset, pin_cfg_t cfg) { static const char *afnames[] = { [NMK_GPIO_ALT_GPIO] = "GPIO", [NMK_GPIO_ALT_A] = "A", [NMK_GPIO_ALT_B] = "B", [NMK_GPIO_ALT_C] = "C" }; static const char *pullnames[] = { [NMK_GPIO_PULL_NONE] = "none", [NMK_GPIO_PULL_UP] = "up", [NMK_GPIO_PULL_DOWN] = "down", [3] /* illegal */ = "??" }; static const char *slpmnames[] = { [NMK_GPIO_SLPM_INPUT] = "input/wakeup", [NMK_GPIO_SLPM_NOCHANGE] = "no-change/no-wakeup", }; int pin = PIN_NUM(cfg); int pull = PIN_PULL(cfg); int af = PIN_ALT(cfg); int slpm = PIN_SLPM(cfg); int output = PIN_DIR(cfg); int val = PIN_VAL(cfg); dev_dbg(nmk_chip->chip.dev, "pin %d: af %s, pull %s, slpm %s (%s%s)\n", pin, afnames[af], pullnames[pull], slpmnames[slpm], output ? "output " : "input", output ? (val ? "high" : "low") : ""); if (output) __nmk_gpio_make_output(nmk_chip, offset, val); else { __nmk_gpio_make_input(nmk_chip, offset); __nmk_gpio_set_pull(nmk_chip, offset, pull); } __nmk_gpio_set_slpm(nmk_chip, offset, slpm); __nmk_gpio_set_mode(nmk_chip, offset, af); } /** * nmk_config_pin - configure a pin's mux attributes * @cfg: pin confguration * * Configures a pin's mode (alternate function or GPIO), its pull up status, * and its sleep mode based on the specified configuration. The @cfg is * usually one of the SoC specific macros defined in mach/-pins.h. These * are constructed using, and can be further enhanced with, the macros in * plat/pincfg.h. * * If a pin's mode is set to GPIO, it is configured as an input to avoid * side-effects. The gpio can be manipulated later using standard GPIO API * calls. */ int nmk_config_pin(pin_cfg_t cfg) { struct nmk_gpio_chip *nmk_chip; int gpio = PIN_NUM(cfg); unsigned long flags; nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); if (!nmk_chip) return -EINVAL; spin_lock_irqsave(&nmk_chip->lock, flags); __nmk_config_pin(nmk_chip, gpio - nmk_chip->chip.base, cfg); spin_unlock_irqrestore(&nmk_chip->lock, flags); return 0; } EXPORT_SYMBOL(nmk_config_pin); /** * nmk_config_pins - configure several pins at once * @cfgs: array of pin configurations * @num: number of elments in the array * * Configures several pins using nmk_config_pin(). Refer to that function for * further information. */ int nmk_config_pins(pin_cfg_t *cfgs, int num) { int ret = 0; int i; for (i = 0; i < num; i++) { int ret = nmk_config_pin(cfgs[i]); if (ret) break; } return ret; } EXPORT_SYMBOL(nmk_config_pins); /** * nmk_gpio_set_slpm() - configure the sleep mode of a pin * @gpio: pin number * @mode: NMK_GPIO_SLPM_INPUT or NMK_GPIO_SLPM_NOCHANGE, * * Sets the sleep mode of a pin. If @mode is NMK_GPIO_SLPM_INPUT, the pin is * changed to an input (with pullup/down enabled) in sleep and deep sleep. If * @mode is NMK_GPIO_SLPM_NOCHANGE, the pin remains in the state it was * configured even when in sleep and deep sleep. * * On DB8500v2 onwards, this setting loses the previous meaning and instead * indicates if wakeup detection is enabled on the pin. Note that * enable_irq_wake() will automatically enable wakeup detection. */ int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode) { struct nmk_gpio_chip *nmk_chip; unsigned long flags; nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); if (!nmk_chip) return -EINVAL; spin_lock_irqsave(&nmk_chip->lock, flags); __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode); spin_unlock_irqrestore(&nmk_chip->lock, flags); return 0; } /** * nmk_gpio_set_pull() - enable/disable pull up/down on a gpio * @gpio: pin number * @pull: one of NMK_GPIO_PULL_DOWN, NMK_GPIO_PULL_UP, and NMK_GPIO_PULL_NONE * * Enables/disables pull up/down on a specified pin. This only takes effect if * the pin is configured as an input (either explicitly or by the alternate * function). * * NOTE: If enabling the pull up/down, the caller must ensure that the GPIO is * configured as an input. Otherwise, due to the way the controller registers * work, this function will change the value output on the pin. */ int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull) { struct nmk_gpio_chip *nmk_chip; unsigned long flags; nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); if (!nmk_chip) return -EINVAL; spin_lock_irqsave(&nmk_chip->lock, flags); __nmk_gpio_set_pull(nmk_chip, gpio - nmk_chip->chip.base, pull); spin_unlock_irqrestore(&nmk_chip->lock, flags); return 0; } /* Mode functions */ int nmk_gpio_set_mode(int gpio, int gpio_mode) { struct nmk_gpio_chip *nmk_chip; unsigned long flags; nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); if (!nmk_chip) return -EINVAL; spin_lock_irqsave(&nmk_chip->lock, flags); __nmk_gpio_set_mode(nmk_chip, gpio - nmk_chip->chip.base, gpio_mode); spin_unlock_irqrestore(&nmk_chip->lock, flags); return 0; } EXPORT_SYMBOL(nmk_gpio_set_mode); int nmk_gpio_get_mode(int gpio) { struct nmk_gpio_chip *nmk_chip; u32 afunc, bfunc, bit; nmk_chip = get_irq_chip_data(NOMADIK_GPIO_TO_IRQ(gpio)); if (!nmk_chip) return -EINVAL; bit = 1 << (gpio - nmk_chip->chip.base); afunc = readl(nmk_chip->addr + NMK_GPIO_AFSLA) & bit; bfunc = readl(nmk_chip->addr + NMK_GPIO_AFSLB) & bit; return (afunc ? NMK_GPIO_ALT_A : 0) | (bfunc ? NMK_GPIO_ALT_B : 0); } EXPORT_SYMBOL(nmk_gpio_get_mode); /* IRQ functions */ static inline int nmk_gpio_get_bitmask(int gpio) { return 1 << (gpio % 32); } static void nmk_gpio_irq_ack(unsigned int irq) { int gpio; struct nmk_gpio_chip *nmk_chip; gpio = NOMADIK_IRQ_TO_GPIO(irq); nmk_chip = get_irq_chip_data(irq); if (!nmk_chip) return; writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC); } enum nmk_gpio_irq_type { NORMAL, WAKE, }; static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip, int gpio, enum nmk_gpio_irq_type which, bool enable) { u32 rimsc = which == WAKE ? NMK_GPIO_RWIMSC : NMK_GPIO_RIMSC; u32 fimsc = which == WAKE ? NMK_GPIO_FWIMSC : NMK_GPIO_FIMSC; u32 bitmask = nmk_gpio_get_bitmask(gpio); u32 reg; /* we must individually set/clear the two edges */ if (nmk_chip->edge_rising & bitmask) { reg = readl(nmk_chip->addr + rimsc); if (enable) reg |= bitmask; else reg &= ~bitmask; writel(reg, nmk_chip->addr + rimsc); } if (nmk_chip->edge_falling & bitmask) { reg = readl(nmk_chip->addr + fimsc); if (enable) reg |= bitmask; else reg &= ~bitmask; writel(reg, nmk_chip->addr + fimsc); } } static int nmk_gpio_irq_modify(unsigned int irq, enum nmk_gpio_irq_type which, bool enable) { int gpio; struct nmk_gpio_chip *nmk_chip; unsigned long flags; u32 bitmask; gpio = NOMADIK_IRQ_TO_GPIO(irq); nmk_chip = get_irq_chip_data(irq); bitmask = nmk_gpio_get_bitmask(gpio); if (!nmk_chip) return -EINVAL; spin_lock_irqsave(&nmk_chip->lock, flags); __nmk_gpio_irq_modify(nmk_chip, gpio, which, enable); spin_unlock_irqrestore(&nmk_chip->lock, flags); return 0; } static void nmk_gpio_irq_mask(unsigned int irq) { nmk_gpio_irq_modify(irq, NORMAL, false); } static void nmk_gpio_irq_unmask(unsigned int irq) { nmk_gpio_irq_modify(irq, NORMAL, true); } static int nmk_gpio_irq_set_wake(unsigned int irq, unsigned int on) { struct nmk_gpio_chip *nmk_chip; unsigned long flags; int gpio; gpio = NOMADIK_IRQ_TO_GPIO(irq); nmk_chip = get_irq_chip_data(irq); if (!nmk_chip) return -EINVAL; spin_lock_irqsave(&nmk_chip->lock, flags); #ifdef CONFIG_ARCH_U8500 if (cpu_is_u8500v2()) { __nmk_gpio_set_slpm(nmk_chip, gpio, on ? NMK_GPIO_SLPM_WAKEUP_ENABLE : NMK_GPIO_SLPM_WAKEUP_DISABLE); } #endif __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, on); spin_unlock_irqrestore(&nmk_chip->lock, flags); return 0; } static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type) { struct irq_desc *desc = irq_to_desc(irq); bool enabled = !(desc->status & IRQ_DISABLED); bool wake = desc->wake_depth; int gpio; struct nmk_gpio_chip *nmk_chip; unsigned long flags; u32 bitmask; gpio = NOMADIK_IRQ_TO_GPIO(irq); nmk_chip = get_irq_chip_data(irq); bitmask = nmk_gpio_get_bitmask(gpio); if (!nmk_chip) return -EINVAL; if (type & IRQ_TYPE_LEVEL_HIGH) return -EINVAL; if (type & IRQ_TYPE_LEVEL_LOW) return -EINVAL; spin_lock_irqsave(&nmk_chip->lock, flags); if (enabled) __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, false); if (wake) __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, false); nmk_chip->edge_rising &= ~bitmask; if (type & IRQ_TYPE_EDGE_RISING) nmk_chip->edge_rising |= bitmask; nmk_chip->edge_falling &= ~bitmask; if (type & IRQ_TYPE_EDGE_FALLING) nmk_chip->edge_falling |= bitmask; if (enabled) __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, true); if (wake) __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, true); spin_unlock_irqrestore(&nmk_chip->lock, flags); return 0; } static struct irq_chip nmk_gpio_irq_chip = { .name = "Nomadik-GPIO", .ack = nmk_gpio_irq_ack, .mask = nmk_gpio_irq_mask, .unmask = nmk_gpio_irq_unmask, .set_type = nmk_gpio_irq_set_type, .set_wake = nmk_gpio_irq_set_wake, }; static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) { struct nmk_gpio_chip *nmk_chip; struct irq_chip *host_chip = get_irq_chip(irq); unsigned int gpio_irq; u32 pending; unsigned int first_irq; if (host_chip->mask_ack) host_chip->mask_ack(irq); else { host_chip->mask(irq); if (host_chip->ack) host_chip->ack(irq); } nmk_chip = get_irq_data(irq); first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) { gpio_irq = first_irq + __ffs(pending); generic_handle_irq(gpio_irq); } host_chip->unmask(irq); } static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip) { unsigned int first_irq; int i; first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base); for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) { set_irq_chip(i, &nmk_gpio_irq_chip); set_irq_handler(i, handle_edge_irq); set_irq_flags(i, IRQF_VALID); set_irq_chip_data(i, nmk_chip); set_irq_type(i, IRQ_TYPE_EDGE_FALLING); } set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler); set_irq_data(nmk_chip->parent_irq, nmk_chip); return 0; } /* I/O Functions */ static int nmk_gpio_make_input(struct gpio_chip *chip, unsigned offset) { struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip); writel(1 << offset, nmk_chip->addr + NMK_GPIO_DIRC); return 0; } static int nmk_gpio_get_input(struct gpio_chip *chip, unsigned offset) { struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip); u32 bit = 1 << offset; return (readl(nmk_chip->addr + NMK_GPIO_DAT) & bit) != 0; } static void nmk_gpio_set_output(struct gpio_chip *chip, unsigned offset, int val) { struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip); __nmk_gpio_set_output(nmk_chip, offset, val); } static int nmk_gpio_make_output(struct gpio_chip *chip, unsigned offset, int val) { struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip); __nmk_gpio_make_output(nmk_chip, offset, val); return 0; } static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset) { struct nmk_gpio_chip *nmk_chip = container_of(chip, struct nmk_gpio_chip, chip); return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset; } /* This structure is replicated for each GPIO block allocated at probe time */ static struct gpio_chip nmk_gpio_template = { .direction_input = nmk_gpio_make_input, .get = nmk_gpio_get_input, .direction_output = nmk_gpio_make_output, .set = nmk_gpio_set_output, .to_irq = nmk_gpio_to_irq, .ngpio = NMK_GPIO_PER_CHIP, .can_sleep = 0, }; static int __devinit nmk_gpio_probe(struct platform_device *dev) { struct nmk_gpio_platform_data *pdata = dev->dev.platform_data; struct nmk_gpio_chip *nmk_chip; struct gpio_chip *chip; struct resource *res; struct clk *clk; int irq; int ret; if (!pdata) return -ENODEV; res = platform_get_resource(dev, IORESOURCE_MEM, 0); if (!res) { ret = -ENOENT; goto out; } irq = platform_get_irq(dev, 0); if (irq < 0) { ret = irq; goto out; } if (request_mem_region(res->start, resource_size(res), dev_name(&dev->dev)) == NULL) { ret = -EBUSY; goto out; } clk = clk_get(&dev->dev, NULL); if (IS_ERR(clk)) { ret = PTR_ERR(clk); goto out_release; } clk_enable(clk); nmk_chip = kzalloc(sizeof(*nmk_chip), GFP_KERNEL); if (!nmk_chip) { ret = -ENOMEM; goto out_clk; } /* * The virt address in nmk_chip->addr is in the nomadik register space, * so we can simply convert the resource address, without remapping */ nmk_chip->clk = clk; nmk_chip->addr = io_p2v(res->start); nmk_chip->chip = nmk_gpio_template; nmk_chip->parent_irq = irq; spin_lock_init(&nmk_chip->lock); chip = &nmk_chip->chip; chip->base = pdata->first_gpio; chip->label = pdata->name; chip->dev = &dev->dev; chip->owner = THIS_MODULE; ret = gpiochip_add(&nmk_chip->chip); if (ret) goto out_free; platform_set_drvdata(dev, nmk_chip); nmk_gpio_init_irq(nmk_chip); dev_info(&dev->dev, "Bits %i-%i at address %p\n", nmk_chip->chip.base, nmk_chip->chip.base+31, nmk_chip->addr); return 0; out_free: kfree(nmk_chip); out_clk: clk_disable(clk); clk_put(clk); out_release: release_mem_region(res->start, resource_size(res)); out: dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret, pdata->first_gpio, pdata->first_gpio+31); return ret; } static struct platform_driver nmk_gpio_driver = { .driver = { .owner = THIS_MODULE, .name = "gpio", }, .probe = nmk_gpio_probe, .suspend = NULL, /* to be done */ .resume = NULL, }; static int __init nmk_gpio_init(void) { return platform_driver_register(&nmk_gpio_driver); } core_initcall(nmk_gpio_init); MODULE_AUTHOR("Prafulla WADASKAR and Alessandro Rubini"); MODULE_DESCRIPTION("Nomadik GPIO Driver"); MODULE_LICENSE("GPL");