/* * Renesas R-Car GPIO Support * * Copyright (C) 2014 Renesas Electronics Corporation * Copyright (C) 2013 Magnus Damm * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/clk.h> #include <linux/err.h> #include <linux/gpio.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/ioport.h> #include <linux/irq.h> #include <linux/module.h> #include <linux/of.h> #include <linux/pinctrl/consumer.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/spinlock.h> #include <linux/slab.h> struct gpio_rcar_priv { void __iomem *base; spinlock_t lock; struct platform_device *pdev; struct gpio_chip gpio_chip; struct irq_chip irq_chip; struct clk *clk; unsigned int irq_parent; bool has_both_edge_trigger; bool needs_clk; }; #define IOINTSEL 0x00 /* General IO/Interrupt Switching Register */ #define INOUTSEL 0x04 /* General Input/Output Switching Register */ #define OUTDT 0x08 /* General Output Register */ #define INDT 0x0c /* General Input Register */ #define INTDT 0x10 /* Interrupt Display Register */ #define INTCLR 0x14 /* Interrupt Clear Register */ #define INTMSK 0x18 /* Interrupt Mask Register */ #define MSKCLR 0x1c /* Interrupt Mask Clear Register */ #define POSNEG 0x20 /* Positive/Negative Logic Select Register */ #define EDGLEVEL 0x24 /* Edge/level Select Register */ #define FILONOFF 0x28 /* Chattering Prevention On/Off Register */ #define BOTHEDGE 0x4c /* One Edge/Both Edge Select Register */ #define RCAR_MAX_GPIO_PER_BANK 32 static inline u32 gpio_rcar_read(struct gpio_rcar_priv *p, int offs) { return ioread32(p->base + offs); } static inline void gpio_rcar_write(struct gpio_rcar_priv *p, int offs, u32 value) { iowrite32(value, p->base + offs); } static void gpio_rcar_modify_bit(struct gpio_rcar_priv *p, int offs, int bit, bool value) { u32 tmp = gpio_rcar_read(p, offs); if (value) tmp |= BIT(bit); else tmp &= ~BIT(bit); gpio_rcar_write(p, offs, tmp); } static void gpio_rcar_irq_disable(struct irq_data *d) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct gpio_rcar_priv *p = gpiochip_get_data(gc); gpio_rcar_write(p, INTMSK, ~BIT(irqd_to_hwirq(d))); } static void gpio_rcar_irq_enable(struct irq_data *d) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct gpio_rcar_priv *p = gpiochip_get_data(gc); gpio_rcar_write(p, MSKCLR, BIT(irqd_to_hwirq(d))); } static void gpio_rcar_config_interrupt_input_mode(struct gpio_rcar_priv *p, unsigned int hwirq, bool active_high_rising_edge, bool level_trigger, bool both) { unsigned long flags; /* follow steps in the GPIO documentation for * "Setting Edge-Sensitive Interrupt Input Mode" and * "Setting Level-Sensitive Interrupt Input Mode" */ spin_lock_irqsave(&p->lock, flags); /* Configure postive or negative logic in POSNEG */ gpio_rcar_modify_bit(p, POSNEG, hwirq, !active_high_rising_edge); /* Configure edge or level trigger in EDGLEVEL */ gpio_rcar_modify_bit(p, EDGLEVEL, hwirq, !level_trigger); /* Select one edge or both edges in BOTHEDGE */ if (p->has_both_edge_trigger) gpio_rcar_modify_bit(p, BOTHEDGE, hwirq, both); /* Select "Interrupt Input Mode" in IOINTSEL */ gpio_rcar_modify_bit(p, IOINTSEL, hwirq, true); /* Write INTCLR in case of edge trigger */ if (!level_trigger) gpio_rcar_write(p, INTCLR, BIT(hwirq)); spin_unlock_irqrestore(&p->lock, flags); } static int gpio_rcar_irq_set_type(struct irq_data *d, unsigned int type) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct gpio_rcar_priv *p = gpiochip_get_data(gc); unsigned int hwirq = irqd_to_hwirq(d); dev_dbg(&p->pdev->dev, "sense irq = %d, type = %d\n", hwirq, type); switch (type & IRQ_TYPE_SENSE_MASK) { case IRQ_TYPE_LEVEL_HIGH: gpio_rcar_config_interrupt_input_mode(p, hwirq, true, true, false); break; case IRQ_TYPE_LEVEL_LOW: gpio_rcar_config_interrupt_input_mode(p, hwirq, false, true, false); break; case IRQ_TYPE_EDGE_RISING: gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false, false); break; case IRQ_TYPE_EDGE_FALLING: gpio_rcar_config_interrupt_input_mode(p, hwirq, false, false, false); break; case IRQ_TYPE_EDGE_BOTH: if (!p->has_both_edge_trigger) return -EINVAL; gpio_rcar_config_interrupt_input_mode(p, hwirq, true, false, true); break; default: return -EINVAL; } return 0; } static int gpio_rcar_irq_set_wake(struct irq_data *d, unsigned int on) { struct gpio_chip *gc = irq_data_get_irq_chip_data(d); struct gpio_rcar_priv *p = gpiochip_get_data(gc); int error; if (p->irq_parent) { error = irq_set_irq_wake(p->irq_parent, on); if (error) { dev_dbg(&p->pdev->dev, "irq %u doesn't support irq_set_wake\n", p->irq_parent); p->irq_parent = 0; } } if (!p->clk) return 0; if (on) clk_enable(p->clk); else clk_disable(p->clk); return 0; } static irqreturn_t gpio_rcar_irq_handler(int irq, void *dev_id) { struct gpio_rcar_priv *p = dev_id; u32 pending; unsigned int offset, irqs_handled = 0; while ((pending = gpio_rcar_read(p, INTDT) & gpio_rcar_read(p, INTMSK))) { offset = __ffs(pending); gpio_rcar_write(p, INTCLR, BIT(offset)); generic_handle_irq(irq_find_mapping(p->gpio_chip.irqdomain, offset)); irqs_handled++; } return irqs_handled ? IRQ_HANDLED : IRQ_NONE; } static void gpio_rcar_config_general_input_output_mode(struct gpio_chip *chip, unsigned int gpio, bool output) { struct gpio_rcar_priv *p = gpiochip_get_data(chip); unsigned long flags; /* follow steps in the GPIO documentation for * "Setting General Output Mode" and * "Setting General Input Mode" */ spin_lock_irqsave(&p->lock, flags); /* Configure postive logic in POSNEG */ gpio_rcar_modify_bit(p, POSNEG, gpio, false); /* Select "General Input/Output Mode" in IOINTSEL */ gpio_rcar_modify_bit(p, IOINTSEL, gpio, false); /* Select Input Mode or Output Mode in INOUTSEL */ gpio_rcar_modify_bit(p, INOUTSEL, gpio, output); spin_unlock_irqrestore(&p->lock, flags); } static int gpio_rcar_request(struct gpio_chip *chip, unsigned offset) { return pinctrl_request_gpio(chip->base + offset); } static void gpio_rcar_free(struct gpio_chip *chip, unsigned offset) { pinctrl_free_gpio(chip->base + offset); /* * Set the GPIO as an input to ensure that the next GPIO request won't * drive the GPIO pin as an output. */ gpio_rcar_config_general_input_output_mode(chip, offset, false); } static int gpio_rcar_direction_input(struct gpio_chip *chip, unsigned offset) { gpio_rcar_config_general_input_output_mode(chip, offset, false); return 0; } static int gpio_rcar_get(struct gpio_chip *chip, unsigned offset) { u32 bit = BIT(offset); /* testing on r8a7790 shows that INDT does not show correct pin state * when configured as output, so use OUTDT in case of output pins */ if (gpio_rcar_read(gpiochip_get_data(chip), INOUTSEL) & bit) return !!(gpio_rcar_read(gpiochip_get_data(chip), OUTDT) & bit); else return !!(gpio_rcar_read(gpiochip_get_data(chip), INDT) & bit); } static void gpio_rcar_set(struct gpio_chip *chip, unsigned offset, int value) { struct gpio_rcar_priv *p = gpiochip_get_data(chip); unsigned long flags; spin_lock_irqsave(&p->lock, flags); gpio_rcar_modify_bit(p, OUTDT, offset, value); spin_unlock_irqrestore(&p->lock, flags); } static void gpio_rcar_set_multiple(struct gpio_chip *chip, unsigned long *mask, unsigned long *bits) { struct gpio_rcar_priv *p = gpiochip_get_data(chip); unsigned long flags; u32 val, bankmask; bankmask = mask[0] & GENMASK(chip->ngpio - 1, 0); if (!bankmask) return; spin_lock_irqsave(&p->lock, flags); val = gpio_rcar_read(p, OUTDT); val &= ~bankmask; val |= (bankmask & bits[0]); gpio_rcar_write(p, OUTDT, val); spin_unlock_irqrestore(&p->lock, flags); } static int gpio_rcar_direction_output(struct gpio_chip *chip, unsigned offset, int value) { /* write GPIO value to output before selecting output mode of pin */ gpio_rcar_set(chip, offset, value); gpio_rcar_config_general_input_output_mode(chip, offset, true); return 0; } struct gpio_rcar_info { bool has_both_edge_trigger; bool needs_clk; }; static const struct gpio_rcar_info gpio_rcar_info_gen1 = { .has_both_edge_trigger = false, .needs_clk = false, }; static const struct gpio_rcar_info gpio_rcar_info_gen2 = { .has_both_edge_trigger = true, .needs_clk = true, }; static const struct of_device_id gpio_rcar_of_table[] = { { .compatible = "renesas,gpio-r8a7790", .data = &gpio_rcar_info_gen2, }, { .compatible = "renesas,gpio-r8a7791", .data = &gpio_rcar_info_gen2, }, { .compatible = "renesas,gpio-r8a7792", .data = &gpio_rcar_info_gen2, }, { .compatible = "renesas,gpio-r8a7793", .data = &gpio_rcar_info_gen2, }, { .compatible = "renesas,gpio-r8a7794", .data = &gpio_rcar_info_gen2, }, { .compatible = "renesas,gpio-r8a7795", /* Gen3 GPIO is identical to Gen2. */ .data = &gpio_rcar_info_gen2, }, { .compatible = "renesas,gpio-rcar", .data = &gpio_rcar_info_gen1, }, { /* Terminator */ }, }; MODULE_DEVICE_TABLE(of, gpio_rcar_of_table); static int gpio_rcar_parse_dt(struct gpio_rcar_priv *p, unsigned int *npins) { struct device_node *np = p->pdev->dev.of_node; const struct of_device_id *match; const struct gpio_rcar_info *info; struct of_phandle_args args; int ret; match = of_match_node(gpio_rcar_of_table, np); if (!match) return -EINVAL; info = match->data; ret = of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, 0, &args); *npins = ret == 0 ? args.args[2] : RCAR_MAX_GPIO_PER_BANK; p->has_both_edge_trigger = info->has_both_edge_trigger; p->needs_clk = info->needs_clk; if (*npins == 0 || *npins > RCAR_MAX_GPIO_PER_BANK) { dev_warn(&p->pdev->dev, "Invalid number of gpio lines %u, using %u\n", *npins, RCAR_MAX_GPIO_PER_BANK); *npins = RCAR_MAX_GPIO_PER_BANK; } return 0; } static int gpio_rcar_probe(struct platform_device *pdev) { struct gpio_rcar_priv *p; struct resource *io, *irq; struct gpio_chip *gpio_chip; struct irq_chip *irq_chip; struct device *dev = &pdev->dev; const char *name = dev_name(dev); unsigned int npins; int ret; p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL); if (!p) return -ENOMEM; p->pdev = pdev; spin_lock_init(&p->lock); /* Get device configuration from DT node */ ret = gpio_rcar_parse_dt(p, &npins); if (ret < 0) return ret; platform_set_drvdata(pdev, p); p->clk = devm_clk_get(dev, NULL); if (IS_ERR(p->clk)) { if (p->needs_clk) { dev_err(dev, "unable to get clock\n"); ret = PTR_ERR(p->clk); goto err0; } p->clk = NULL; } pm_runtime_enable(dev); pm_runtime_get_sync(dev); io = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (!io || !irq) { dev_err(dev, "missing IRQ or IOMEM\n"); ret = -EINVAL; goto err0; } p->base = devm_ioremap_nocache(dev, io->start, resource_size(io)); if (!p->base) { dev_err(dev, "failed to remap I/O memory\n"); ret = -ENXIO; goto err0; } gpio_chip = &p->gpio_chip; gpio_chip->request = gpio_rcar_request; gpio_chip->free = gpio_rcar_free; gpio_chip->direction_input = gpio_rcar_direction_input; gpio_chip->get = gpio_rcar_get; gpio_chip->direction_output = gpio_rcar_direction_output; gpio_chip->set = gpio_rcar_set; gpio_chip->set_multiple = gpio_rcar_set_multiple; gpio_chip->label = name; gpio_chip->parent = dev; gpio_chip->owner = THIS_MODULE; gpio_chip->base = -1; gpio_chip->ngpio = npins; irq_chip = &p->irq_chip; irq_chip->name = name; irq_chip->irq_mask = gpio_rcar_irq_disable; irq_chip->irq_unmask = gpio_rcar_irq_enable; irq_chip->irq_set_type = gpio_rcar_irq_set_type; irq_chip->irq_set_wake = gpio_rcar_irq_set_wake; irq_chip->flags = IRQCHIP_SET_TYPE_MASKED | IRQCHIP_MASK_ON_SUSPEND; ret = gpiochip_add_data(gpio_chip, p); if (ret) { dev_err(dev, "failed to add GPIO controller\n"); goto err0; } ret = gpiochip_irqchip_add(gpio_chip, irq_chip, 0, handle_level_irq, IRQ_TYPE_NONE); if (ret) { dev_err(dev, "cannot add irqchip\n"); goto err1; } p->irq_parent = irq->start; if (devm_request_irq(dev, irq->start, gpio_rcar_irq_handler, IRQF_SHARED, name, p)) { dev_err(dev, "failed to request IRQ\n"); ret = -ENOENT; goto err1; } dev_info(dev, "driving %d GPIOs\n", npins); return 0; err1: gpiochip_remove(gpio_chip); err0: pm_runtime_put(dev); pm_runtime_disable(dev); return ret; } static int gpio_rcar_remove(struct platform_device *pdev) { struct gpio_rcar_priv *p = platform_get_drvdata(pdev); gpiochip_remove(&p->gpio_chip); pm_runtime_put(&pdev->dev); pm_runtime_disable(&pdev->dev); return 0; } static struct platform_driver gpio_rcar_device_driver = { .probe = gpio_rcar_probe, .remove = gpio_rcar_remove, .driver = { .name = "gpio_rcar", .of_match_table = of_match_ptr(gpio_rcar_of_table), } }; module_platform_driver(gpio_rcar_device_driver); MODULE_AUTHOR("Magnus Damm"); MODULE_DESCRIPTION("Renesas R-Car GPIO Driver"); MODULE_LICENSE("GPL v2");