// SPDX-License-Identifier: GPL-2.0-only /* * U300 GPIO module. * * Copyright (C) 2007-2012 ST-Ericsson AB * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0) * Author: Linus Walleij * Author: Jonas Aaberg */ #include #include #include #include #include #include #include #include #include #include #include #include #include "pinctrl-coh901.h" #define U300_GPIO_PORT_STRIDE (0x30) /* * Control Register 32bit (R/W) * bit 15-9 (mask 0x0000FE00) contains the number of cores. 8*cores * gives the number of GPIO pins. * bit 8-2 (mask 0x000001FC) contains the core version ID. */ #define U300_GPIO_CR (0x00) #define U300_GPIO_CR_SYNC_SEL_ENABLE (0x00000002UL) #define U300_GPIO_CR_BLOCK_CLKRQ_ENABLE (0x00000001UL) #define U300_GPIO_PXPDIR (0x04) #define U300_GPIO_PXPDOR (0x08) #define U300_GPIO_PXPCR (0x0C) #define U300_GPIO_PXPCR_ALL_PINS_MODE_MASK (0x0000FFFFUL) #define U300_GPIO_PXPCR_PIN_MODE_MASK (0x00000003UL) #define U300_GPIO_PXPCR_PIN_MODE_SHIFT (0x00000002UL) #define U300_GPIO_PXPCR_PIN_MODE_INPUT (0x00000000UL) #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL (0x00000001UL) #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN (0x00000002UL) #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE (0x00000003UL) #define U300_GPIO_PXPER (0x10) #define U300_GPIO_PXPER_ALL_PULL_UP_DISABLE_MASK (0x000000FFUL) #define U300_GPIO_PXPER_PULL_UP_DISABLE (0x00000001UL) #define U300_GPIO_PXIEV (0x14) #define U300_GPIO_PXIEN (0x18) #define U300_GPIO_PXIFR (0x1C) #define U300_GPIO_PXICR (0x20) #define U300_GPIO_PXICR_ALL_IRQ_CONFIG_MASK (0x000000FFUL) #define U300_GPIO_PXICR_IRQ_CONFIG_MASK (0x00000001UL) #define U300_GPIO_PXICR_IRQ_CONFIG_FALLING_EDGE (0x00000000UL) #define U300_GPIO_PXICR_IRQ_CONFIG_RISING_EDGE (0x00000001UL) /* 8 bits per port, no version has more than 7 ports */ #define U300_GPIO_NUM_PORTS 7 #define U300_GPIO_PINS_PER_PORT 8 #define U300_GPIO_MAX (U300_GPIO_PINS_PER_PORT * U300_GPIO_NUM_PORTS) struct u300_gpio_port { struct u300_gpio *gpio; char name[8]; int irq; int number; u8 toggle_edge_mode; }; struct u300_gpio { struct gpio_chip chip; struct u300_gpio_port ports[U300_GPIO_NUM_PORTS]; struct clk *clk; void __iomem *base; struct device *dev; u32 stride; /* Register offsets */ u32 pcr; u32 dor; u32 dir; u32 per; u32 icr; u32 ien; u32 iev; }; /* * Macro to expand to read a specific register found in the "gpio" * struct. It requires the struct u300_gpio *gpio variable to exist in * its context. It calculates the port offset from the given pin * offset, muliplies by the port stride and adds the register offset * so it provides a pointer to the desired register. */ #define U300_PIN_REG(pin, reg) \ (gpio->base + (pin >> 3) * gpio->stride + gpio->reg) /* * Provides a bitmask for a specific gpio pin inside an 8-bit GPIO * register. */ #define U300_PIN_BIT(pin) \ (1 << (pin & 0x07)) struct u300_gpio_confdata { u16 bias_mode; bool output; int outval; }; #define U300_FLOATING_INPUT { \ .bias_mode = PIN_CONFIG_BIAS_HIGH_IMPEDANCE, \ .output = false, \ } #define U300_PULL_UP_INPUT { \ .bias_mode = PIN_CONFIG_BIAS_PULL_UP, \ .output = false, \ } #define U300_OUTPUT_LOW { \ .output = true, \ .outval = 0, \ } #define U300_OUTPUT_HIGH { \ .output = true, \ .outval = 1, \ } /* Initial configuration */ static const struct u300_gpio_confdata __initconst bs335_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = { /* Port 0, pins 0-7 */ { U300_FLOATING_INPUT, U300_OUTPUT_HIGH, U300_FLOATING_INPUT, U300_OUTPUT_LOW, U300_OUTPUT_LOW, U300_OUTPUT_LOW, U300_OUTPUT_LOW, U300_OUTPUT_LOW, }, /* Port 1, pins 0-7 */ { U300_OUTPUT_LOW, U300_OUTPUT_LOW, U300_OUTPUT_LOW, U300_PULL_UP_INPUT, U300_FLOATING_INPUT, U300_OUTPUT_HIGH, U300_OUTPUT_LOW, U300_OUTPUT_LOW, }, /* Port 2, pins 0-7 */ { U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_OUTPUT_LOW, U300_PULL_UP_INPUT, U300_OUTPUT_LOW, U300_PULL_UP_INPUT, }, /* Port 3, pins 0-7 */ { U300_PULL_UP_INPUT, U300_OUTPUT_LOW, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, }, /* Port 4, pins 0-7 */ { U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, }, /* Port 5, pins 0-7 */ { U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, }, /* Port 6, pind 0-7 */ { U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, U300_FLOATING_INPUT, } }; static int u300_gpio_get(struct gpio_chip *chip, unsigned offset) { struct u300_gpio *gpio = gpiochip_get_data(chip); return !!(readl(U300_PIN_REG(offset, dir)) & U300_PIN_BIT(offset)); } static void u300_gpio_set(struct gpio_chip *chip, unsigned offset, int value) { struct u300_gpio *gpio = gpiochip_get_data(chip); unsigned long flags; u32 val; local_irq_save(flags); val = readl(U300_PIN_REG(offset, dor)); if (value) writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, dor)); else writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, dor)); local_irq_restore(flags); } static int u300_gpio_direction_input(struct gpio_chip *chip, unsigned offset) { struct u300_gpio *gpio = gpiochip_get_data(chip); unsigned long flags; u32 val; local_irq_save(flags); val = readl(U300_PIN_REG(offset, pcr)); /* Mask out this pin, note 2 bits per setting */ val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); writel(val, U300_PIN_REG(offset, pcr)); local_irq_restore(flags); return 0; } static int u300_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) { struct u300_gpio *gpio = gpiochip_get_data(chip); unsigned long flags; u32 oldmode; u32 val; local_irq_save(flags); val = readl(U300_PIN_REG(offset, pcr)); /* * Drive mode must be set by the special mode set function, set * push/pull mode by default if no mode has been selected. */ oldmode = val & (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); /* mode = 0 means input, else some mode is already set */ if (oldmode == 0) { val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL << ((offset & 0x07) << 1)); writel(val, U300_PIN_REG(offset, pcr)); } u300_gpio_set(chip, offset, value); local_irq_restore(flags); return 0; } /* Returning -EINVAL means "supported but not available" */ int u300_gpio_config_get(struct gpio_chip *chip, unsigned offset, unsigned long *config) { struct u300_gpio *gpio = gpiochip_get_data(chip); enum pin_config_param param = (enum pin_config_param) *config; bool biasmode; u32 drmode; /* One bit per pin, clamp to bool range */ biasmode = !!(readl(U300_PIN_REG(offset, per)) & U300_PIN_BIT(offset)); /* Mask out the two bits for this pin and shift to bits 0,1 */ drmode = readl(U300_PIN_REG(offset, pcr)); drmode &= (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); drmode >>= ((offset & 0x07) << 1); switch (param) { case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: *config = 0; if (biasmode) return 0; else return -EINVAL; break; case PIN_CONFIG_BIAS_PULL_UP: *config = 0; if (!biasmode) return 0; else return -EINVAL; break; case PIN_CONFIG_DRIVE_PUSH_PULL: *config = 0; if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL) return 0; else return -EINVAL; break; case PIN_CONFIG_DRIVE_OPEN_DRAIN: *config = 0; if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN) return 0; else return -EINVAL; break; case PIN_CONFIG_DRIVE_OPEN_SOURCE: *config = 0; if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE) return 0; else return -EINVAL; break; default: break; } return -ENOTSUPP; } int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset, enum pin_config_param param) { struct u300_gpio *gpio = gpiochip_get_data(chip); unsigned long flags; u32 val; local_irq_save(flags); switch (param) { case PIN_CONFIG_BIAS_DISABLE: case PIN_CONFIG_BIAS_HIGH_IMPEDANCE: val = readl(U300_PIN_REG(offset, per)); writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, per)); break; case PIN_CONFIG_BIAS_PULL_UP: val = readl(U300_PIN_REG(offset, per)); writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, per)); break; case PIN_CONFIG_DRIVE_PUSH_PULL: val = readl(U300_PIN_REG(offset, pcr)); val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL << ((offset & 0x07) << 1)); writel(val, U300_PIN_REG(offset, pcr)); break; case PIN_CONFIG_DRIVE_OPEN_DRAIN: val = readl(U300_PIN_REG(offset, pcr)); val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN << ((offset & 0x07) << 1)); writel(val, U300_PIN_REG(offset, pcr)); break; case PIN_CONFIG_DRIVE_OPEN_SOURCE: val = readl(U300_PIN_REG(offset, pcr)); val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1)); val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE << ((offset & 0x07) << 1)); writel(val, U300_PIN_REG(offset, pcr)); break; default: local_irq_restore(flags); dev_err(gpio->dev, "illegal configuration requested\n"); return -EINVAL; } local_irq_restore(flags); return 0; } static const struct gpio_chip u300_gpio_chip = { .label = "u300-gpio-chip", .owner = THIS_MODULE, .request = gpiochip_generic_request, .free = gpiochip_generic_free, .get = u300_gpio_get, .set = u300_gpio_set, .direction_input = u300_gpio_direction_input, .direction_output = u300_gpio_direction_output, }; static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset) { u32 val; val = readl(U300_PIN_REG(offset, icr)); /* Set mode depending on state */ if (u300_gpio_get(&gpio->chip, offset)) { /* High now, let's trigger on falling edge next then */ writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr)); dev_dbg(gpio->dev, "next IRQ on falling edge on pin %d\n", offset); } else { /* Low now, let's trigger on rising edge next then */ writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr)); dev_dbg(gpio->dev, "next IRQ on rising edge on pin %d\n", offset); } } static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger) { struct gpio_chip *chip = irq_data_get_irq_chip_data(d); struct u300_gpio *gpio = gpiochip_get_data(chip); struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3]; int offset = d->hwirq; u32 val; if ((trigger & IRQF_TRIGGER_RISING) && (trigger & IRQF_TRIGGER_FALLING)) { /* * The GPIO block can only trigger on falling OR rising edges, * not both. So we need to toggle the mode whenever the pin * goes from one state to the other with a special state flag */ dev_dbg(gpio->dev, "trigger on both rising and falling edge on pin %d\n", offset); port->toggle_edge_mode |= U300_PIN_BIT(offset); u300_toggle_trigger(gpio, offset); } else if (trigger & IRQF_TRIGGER_RISING) { dev_dbg(gpio->dev, "trigger on rising edge on pin %d\n", offset); val = readl(U300_PIN_REG(offset, icr)); writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr)); port->toggle_edge_mode &= ~U300_PIN_BIT(offset); } else if (trigger & IRQF_TRIGGER_FALLING) { dev_dbg(gpio->dev, "trigger on falling edge on pin %d\n", offset); val = readl(U300_PIN_REG(offset, icr)); writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr)); port->toggle_edge_mode &= ~U300_PIN_BIT(offset); } return 0; } static void u300_gpio_irq_enable(struct irq_data *d) { struct gpio_chip *chip = irq_data_get_irq_chip_data(d); struct u300_gpio *gpio = gpiochip_get_data(chip); struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3]; int offset = d->hwirq; u32 val; unsigned long flags; dev_dbg(gpio->dev, "enable IRQ for hwirq %lu on port %s, offset %d\n", d->hwirq, port->name, offset); local_irq_save(flags); val = readl(U300_PIN_REG(offset, ien)); writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, ien)); local_irq_restore(flags); } static void u300_gpio_irq_disable(struct irq_data *d) { struct gpio_chip *chip = irq_data_get_irq_chip_data(d); struct u300_gpio *gpio = gpiochip_get_data(chip); int offset = d->hwirq; u32 val; unsigned long flags; local_irq_save(flags); val = readl(U300_PIN_REG(offset, ien)); writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, ien)); local_irq_restore(flags); } static struct irq_chip u300_gpio_irqchip = { .name = "u300-gpio-irqchip", .irq_enable = u300_gpio_irq_enable, .irq_disable = u300_gpio_irq_disable, .irq_set_type = u300_gpio_irq_type, }; static void u300_gpio_irq_handler(struct irq_desc *desc) { unsigned int irq = irq_desc_get_irq(desc); struct irq_chip *parent_chip = irq_desc_get_chip(desc); struct gpio_chip *chip = irq_desc_get_handler_data(desc); struct u300_gpio *gpio = gpiochip_get_data(chip); struct u300_gpio_port *port = &gpio->ports[irq - chip->base]; int pinoffset = port->number << 3; /* get the right stride */ unsigned long val; chained_irq_enter(parent_chip, desc); /* Read event register */ val = readl(U300_PIN_REG(pinoffset, iev)); /* Mask relevant bits */ val &= 0xFFU; /* 8 bits per port */ /* ACK IRQ (clear event) */ writel(val, U300_PIN_REG(pinoffset, iev)); /* Call IRQ handler */ if (val != 0) { int irqoffset; for_each_set_bit(irqoffset, &val, U300_GPIO_PINS_PER_PORT) { int offset = pinoffset + irqoffset; int pin_irq = irq_find_mapping(chip->irq.domain, offset); dev_dbg(gpio->dev, "GPIO IRQ %d on pin %d\n", pin_irq, offset); generic_handle_irq(pin_irq); /* * Triggering IRQ on both rising and falling edge * needs mockery */ if (port->toggle_edge_mode & U300_PIN_BIT(offset)) u300_toggle_trigger(gpio, offset); } } chained_irq_exit(parent_chip, desc); } static void __init u300_gpio_init_pin(struct u300_gpio *gpio, int offset, const struct u300_gpio_confdata *conf) { /* Set mode: input or output */ if (conf->output) { u300_gpio_direction_output(&gpio->chip, offset, conf->outval); /* Deactivate bias mode for output */ u300_gpio_config_set(&gpio->chip, offset, PIN_CONFIG_BIAS_HIGH_IMPEDANCE); /* Set drive mode for output */ u300_gpio_config_set(&gpio->chip, offset, PIN_CONFIG_DRIVE_PUSH_PULL); dev_dbg(gpio->dev, "set up pin %d as output, value: %d\n", offset, conf->outval); } else { u300_gpio_direction_input(&gpio->chip, offset); /* Always set output low on input pins */ u300_gpio_set(&gpio->chip, offset, 0); /* Set bias mode for input */ u300_gpio_config_set(&gpio->chip, offset, conf->bias_mode); dev_dbg(gpio->dev, "set up pin %d as input, bias: %04x\n", offset, conf->bias_mode); } } static void __init u300_gpio_init_coh901571(struct u300_gpio *gpio) { int i, j; /* Write default config and values to all pins */ for (i = 0; i < U300_GPIO_NUM_PORTS; i++) { for (j = 0; j < 8; j++) { const struct u300_gpio_confdata *conf; int offset = (i*8) + j; conf = &bs335_gpio_config[i][j]; u300_gpio_init_pin(gpio, offset, conf); } } } /* * Here we map a GPIO in the local gpio_chip pin space to a pin in * the local pinctrl pin space. The pin controller used is * pinctrl-u300. */ struct coh901_pinpair { unsigned int offset; unsigned int pin_base; }; #define COH901_PINRANGE(a, b) { .offset = a, .pin_base = b } static struct coh901_pinpair coh901_pintable[] = { COH901_PINRANGE(10, 426), COH901_PINRANGE(11, 180), COH901_PINRANGE(12, 165), /* MS/MMC card insertion */ COH901_PINRANGE(13, 179), COH901_PINRANGE(14, 178), COH901_PINRANGE(16, 194), COH901_PINRANGE(17, 193), COH901_PINRANGE(18, 192), COH901_PINRANGE(19, 191), COH901_PINRANGE(20, 186), COH901_PINRANGE(21, 185), COH901_PINRANGE(22, 184), COH901_PINRANGE(23, 183), COH901_PINRANGE(24, 182), COH901_PINRANGE(25, 181), }; static int __init u300_gpio_probe(struct platform_device *pdev) { struct u300_gpio *gpio; struct resource *memres; int err = 0; int portno; u32 val; u32 ifr; int i; gpio = devm_kzalloc(&pdev->dev, sizeof(struct u300_gpio), GFP_KERNEL); if (gpio == NULL) return -ENOMEM; gpio->chip = u300_gpio_chip; gpio->chip.ngpio = U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT; gpio->chip.parent = &pdev->dev; gpio->chip.base = 0; gpio->dev = &pdev->dev; memres = platform_get_resource(pdev, IORESOURCE_MEM, 0); gpio->base = devm_ioremap_resource(&pdev->dev, memres); if (IS_ERR(gpio->base)) return PTR_ERR(gpio->base); gpio->clk = devm_clk_get(gpio->dev, NULL); if (IS_ERR(gpio->clk)) { err = PTR_ERR(gpio->clk); dev_err(gpio->dev, "could not get GPIO clock\n"); return err; } err = clk_prepare_enable(gpio->clk); if (err) { dev_err(gpio->dev, "could not enable GPIO clock\n"); return err; } dev_info(gpio->dev, "initializing GPIO Controller COH 901 571/3\n"); gpio->stride = U300_GPIO_PORT_STRIDE; gpio->pcr = U300_GPIO_PXPCR; gpio->dor = U300_GPIO_PXPDOR; gpio->dir = U300_GPIO_PXPDIR; gpio->per = U300_GPIO_PXPER; gpio->icr = U300_GPIO_PXICR; gpio->ien = U300_GPIO_PXIEN; gpio->iev = U300_GPIO_PXIEV; ifr = U300_GPIO_PXIFR; val = readl(gpio->base + U300_GPIO_CR); dev_info(gpio->dev, "COH901571/3 block version: %d, " \ "number of cores: %d totalling %d pins\n", ((val & 0x000001FC) >> 2), ((val & 0x0000FE00) >> 9), ((val & 0x0000FE00) >> 9) * 8); writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE, gpio->base + U300_GPIO_CR); u300_gpio_init_coh901571(gpio); #ifdef CONFIG_OF_GPIO gpio->chip.of_node = pdev->dev.of_node; #endif err = gpiochip_add_data(&gpio->chip, gpio); if (err) { dev_err(gpio->dev, "unable to add gpiochip: %d\n", err); goto err_no_chip; } err = gpiochip_irqchip_add(&gpio->chip, &u300_gpio_irqchip, 0, handle_simple_irq, IRQ_TYPE_EDGE_FALLING); if (err) { dev_err(gpio->dev, "no GPIO irqchip\n"); goto err_no_irqchip; } /* Add each port with its IRQ separately */ for (portno = 0 ; portno < U300_GPIO_NUM_PORTS; portno++) { struct u300_gpio_port *port = &gpio->ports[portno]; snprintf(port->name, 8, "gpio%d", portno); port->number = portno; port->gpio = gpio; port->irq = platform_get_irq(pdev, portno); gpiochip_set_chained_irqchip(&gpio->chip, &u300_gpio_irqchip, port->irq, u300_gpio_irq_handler); /* Turns off irq force (test register) for this port */ writel(0x0, gpio->base + portno * gpio->stride + ifr); } dev_dbg(gpio->dev, "initialized %d GPIO ports\n", portno); /* * Add pinctrl pin ranges, the pin controller must be registered * at this point */ for (i = 0; i < ARRAY_SIZE(coh901_pintable); i++) { struct coh901_pinpair *p = &coh901_pintable[i]; err = gpiochip_add_pin_range(&gpio->chip, "pinctrl-u300", p->offset, p->pin_base, 1); if (err) goto err_no_range; } platform_set_drvdata(pdev, gpio); return 0; err_no_range: err_no_irqchip: gpiochip_remove(&gpio->chip); err_no_chip: clk_disable_unprepare(gpio->clk); dev_err(&pdev->dev, "module ERROR:%d\n", err); return err; } static int __exit u300_gpio_remove(struct platform_device *pdev) { struct u300_gpio *gpio = platform_get_drvdata(pdev); /* Turn off the GPIO block */ writel(0x00000000U, gpio->base + U300_GPIO_CR); gpiochip_remove(&gpio->chip); clk_disable_unprepare(gpio->clk); return 0; } static const struct of_device_id u300_gpio_match[] = { { .compatible = "stericsson,gpio-coh901" }, {}, }; static struct platform_driver u300_gpio_driver = { .driver = { .name = "u300-gpio", .of_match_table = u300_gpio_match, }, .remove = __exit_p(u300_gpio_remove), }; static int __init u300_gpio_init(void) { return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe); } static void __exit u300_gpio_exit(void) { platform_driver_unregister(&u300_gpio_driver); } arch_initcall(u300_gpio_init); module_exit(u300_gpio_exit); MODULE_AUTHOR("Linus Walleij "); MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335/COH 901 571/3 GPIO driver"); MODULE_LICENSE("GPL");