diff options
Diffstat (limited to 'target/linux/lantiq/files/arch/mips/lantiq/falcon/gpio.c')
| -rw-r--r-- | target/linux/lantiq/files/arch/mips/lantiq/falcon/gpio.c | 409 |
1 files changed, 409 insertions, 0 deletions
diff --git a/target/linux/lantiq/files/arch/mips/lantiq/falcon/gpio.c b/target/linux/lantiq/files/arch/mips/lantiq/falcon/gpio.c new file mode 100644 index 000000000..4147d61c7 --- /dev/null +++ b/target/linux/lantiq/files/arch/mips/lantiq/falcon/gpio.c @@ -0,0 +1,409 @@ +/* + * 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. + * + * Copyright (C) 2011 Thomas Langer <thomas.langer@lantiq.com> + * Copyright (C) 2011 John Crispin <blogic@openwrt.org> + */ + +#include <linux/gpio.h> +#include <linux/interrupt.h> +#include <linux/slab.h> +#include <linux/export.h> +#include <linux/err.h> +#include <linux/platform_device.h> + +#include <lantiq_soc.h> + +/* Multiplexer Control Register */ +#define LTQ_PADC_MUX(x) (x * 0x4) +/* Pad Control Availability Register */ +#define LTQ_PADC_AVAIL 0x000000F0 + +/* Data Output Register */ +#define LTQ_GPIO_OUT 0x00000000 +/* Data Input Register */ +#define LTQ_GPIO_IN 0x00000004 +/* Direction Register */ +#define LTQ_GPIO_DIR 0x00000008 +/* External Interrupt Control Register 0 */ +#define LTQ_GPIO_EXINTCR0 0x00000018 +/* External Interrupt Control Register 1 */ +#define LTQ_GPIO_EXINTCR1 0x0000001C +/* IRN Capture Register */ +#define LTQ_GPIO_IRNCR 0x00000020 +/* IRN Interrupt Configuration Register */ +#define LTQ_GPIO_IRNCFG 0x0000002C +/* IRN Interrupt Enable Set Register */ +#define LTQ_GPIO_IRNRNSET 0x00000030 +/* IRN Interrupt Enable Clear Register */ +#define LTQ_GPIO_IRNENCLR 0x00000034 +/* Output Set Register */ +#define LTQ_GPIO_OUTSET 0x00000040 +/* Output Cler Register */ +#define LTQ_GPIO_OUTCLR 0x00000044 +/* Direction Clear Register */ +#define LTQ_GPIO_DIRSET 0x00000048 +/* Direction Set Register */ +#define LTQ_GPIO_DIRCLR 0x0000004C + +/* turn a gpio_chip into a falcon_gpio_port */ +#define ctop(c) container_of(c, struct falcon_gpio_port, gpio_chip) +/* turn a irq_data into a falcon_gpio_port */ +#define itop(i) ((struct falcon_gpio_port *) irq_get_chip_data(i->irq)) + +#define ltq_pad_r32(p, reg) ltq_r32(p->pad + reg) +#define ltq_pad_w32(p, val, reg) ltq_w32(val, p->pad + reg) +#define ltq_pad_w32_mask(c, clear, set, reg) \ + ltq_pad_w32(c, (ltq_pad_r32(c, reg) & ~(clear)) | (set), reg) + +#define ltq_port_r32(p, reg) ltq_r32(p->port + reg) +#define ltq_port_w32(p, val, reg) ltq_w32(val, p->port + reg) +#define ltq_port_w32_mask(p, clear, set, reg) \ + ltq_port_w32(p, (ltq_port_r32(p, reg) & ~(clear)) | (set), reg) + +#define MAX_PORTS 5 +#define PINS_PER_PORT 32 + +struct falcon_gpio_port { + struct gpio_chip gpio_chip; + void __iomem *pad; + void __iomem *port; + unsigned int irq_base; + unsigned int chained_irq; + struct clk *clk; +}; + +static struct falcon_gpio_port ltq_gpio_port[MAX_PORTS]; + +int gpio_to_irq(unsigned int gpio) +{ + return __gpio_to_irq(gpio); +} +EXPORT_SYMBOL(gpio_to_irq); + +int ltq_gpio_mux_set(unsigned int pin, unsigned int mux) +{ + int port = pin / 100; + int offset = pin % 100; + struct falcon_gpio_port *gpio_port; + + if ((offset >= PINS_PER_PORT) || (port >= MAX_PORTS)) + return -EINVAL; + + gpio_port = <q_gpio_port[port]; + ltq_pad_w32(gpio_port, mux & 0x3, LTQ_PADC_MUX(offset)); + + return 0; +} +EXPORT_SYMBOL(ltq_gpio_mux_set); + +int ltq_gpio_request(struct device *dev, unsigned int pin, unsigned int mux, + unsigned int dir, const char *name) +{ + int port = pin / 100; + int offset = pin % 100; + + if (offset >= PINS_PER_PORT || port >= MAX_PORTS) + return -EINVAL; + + if (devm_gpio_request(dev, pin, name)) { + pr_err("failed to setup lantiq gpio: %s\n", name); + return -EBUSY; + } + + if (dir) + gpio_direction_output(pin, 1); + else + gpio_direction_input(pin); + + return ltq_gpio_mux_set(pin, mux); +} +EXPORT_SYMBOL(ltq_gpio_request); + +static int +falcon_gpio_direction_input(struct gpio_chip *chip, unsigned int offset) +{ + ltq_port_w32(ctop(chip), 1 << offset, LTQ_GPIO_DIRCLR); + + return 0; +} + +static void +falcon_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) +{ + if (value) + ltq_port_w32(ctop(chip), 1 << offset, LTQ_GPIO_OUTSET); + else + ltq_port_w32(ctop(chip), 1 << offset, LTQ_GPIO_OUTCLR); +} + +static int +falcon_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + falcon_gpio_set(chip, offset, value); + ltq_port_w32(ctop(chip), 1 << offset, LTQ_GPIO_DIRSET); + + return 0; +} + +static int +falcon_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + if ((ltq_port_r32(ctop(chip), LTQ_GPIO_DIR) >> offset) & 1) + return (ltq_port_r32(ctop(chip), LTQ_GPIO_OUT) >> offset) & 1; + else + return (ltq_port_r32(ctop(chip), LTQ_GPIO_IN) >> offset) & 1; +} + +static int +falcon_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + if ((ltq_pad_r32(ctop(chip), LTQ_PADC_AVAIL) >> offset) & 1) { + if (ltq_pad_r32(ctop(chip), LTQ_PADC_MUX(offset)) > 1) + return -EBUSY; + /* switch on gpio function */ + ltq_pad_w32(ctop(chip), 1, LTQ_PADC_MUX(offset)); + return 0; + } + + return -ENODEV; +} + +static void +falcon_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + if ((ltq_pad_r32(ctop(chip), LTQ_PADC_AVAIL) >> offset) & 1) { + if (ltq_pad_r32(ctop(chip), LTQ_PADC_MUX(offset)) > 1) + return; + /* switch off gpio function */ + ltq_pad_w32(ctop(chip), 0, LTQ_PADC_MUX(offset)); + } +} + +static int +falcon_gpio_to_irq(struct gpio_chip *chip, unsigned offset) +{ + return ctop(chip)->irq_base + offset; +} + +static void +falcon_gpio_disable_irq(struct irq_data *d) +{ + unsigned int offset = d->irq - itop(d)->irq_base; + + ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNENCLR); +} + +static void +falcon_gpio_enable_irq(struct irq_data *d) +{ + unsigned int offset = d->irq - itop(d)->irq_base; + + if (!ltq_pad_r32(itop(d), LTQ_PADC_MUX(offset)) < 1) + /* switch on gpio function */ + ltq_pad_w32(itop(d), 1, LTQ_PADC_MUX(offset)); + + ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNRNSET); +} + +static void +falcon_gpio_ack_irq(struct irq_data *d) +{ + unsigned int offset = d->irq - itop(d)->irq_base; + + ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNCR); +} + +static void +falcon_gpio_mask_and_ack_irq(struct irq_data *d) +{ + unsigned int offset = d->irq - itop(d)->irq_base; + + ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNENCLR); + ltq_port_w32(itop(d), 1 << offset, LTQ_GPIO_IRNCR); +} + +static struct irq_chip falcon_gpio_irq_chip; +static int +falcon_gpio_irq_type(struct irq_data *d, unsigned int type) +{ + unsigned int offset = d->irq - itop(d)->irq_base; + unsigned int mask = 1 << offset; + + if ((type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_NONE) + return 0; + + if ((type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) != 0) { + /* level triggered */ + ltq_port_w32_mask(itop(d), 0, mask, LTQ_GPIO_IRNCFG); + irq_set_chip_and_handler_name(d->irq, + &falcon_gpio_irq_chip, handle_level_irq, "mux"); + } else { + /* edge triggered */ + ltq_port_w32_mask(itop(d), mask, 0, LTQ_GPIO_IRNCFG); + irq_set_chip_and_handler_name(d->irq, + &falcon_gpio_irq_chip, handle_simple_irq, "mux"); + } + + if ((type & IRQ_TYPE_EDGE_BOTH) == IRQ_TYPE_EDGE_BOTH) { + ltq_port_w32_mask(itop(d), mask, 0, LTQ_GPIO_EXINTCR0); + ltq_port_w32_mask(itop(d), 0, mask, LTQ_GPIO_EXINTCR1); + } else { + if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH)) != 0) + /* positive logic: rising edge, high level */ + ltq_port_w32_mask(itop(d), mask, 0, LTQ_GPIO_EXINTCR0); + else + /* negative logic: falling edge, low level */ + ltq_port_w32_mask(itop(d), 0, mask, LTQ_GPIO_EXINTCR0); + ltq_port_w32_mask(itop(d), mask, 0, LTQ_GPIO_EXINTCR1); + } + + return gpio_direction_input(itop(d)->gpio_chip.base + offset); +} + +static void +falcon_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + struct falcon_gpio_port *gpio_port = irq_desc_get_handler_data(desc); + unsigned long irncr; + int offset; + + /* acknowledge interrupt */ + irncr = ltq_port_r32(gpio_port, LTQ_GPIO_IRNCR); + ltq_port_w32(gpio_port, irncr, LTQ_GPIO_IRNCR); + + desc->irq_data.chip->irq_ack(&desc->irq_data); + + for_each_set_bit(offset, &irncr, gpio_port->gpio_chip.ngpio) + generic_handle_irq(gpio_port->irq_base + offset); +} + +static struct irq_chip falcon_gpio_irq_chip = { + .name = "gpio_irq_mux", + .irq_mask = falcon_gpio_disable_irq, + .irq_unmask = falcon_gpio_enable_irq, + .irq_ack = falcon_gpio_ack_irq, + .irq_mask_ack = falcon_gpio_mask_and_ack_irq, + .irq_set_type = falcon_gpio_irq_type, +}; + +static struct irqaction gpio_cascade = { + .handler = no_action, + .flags = IRQF_DISABLED, + .name = "gpio_cascade", +}; + +static int +falcon_gpio_probe(struct platform_device *pdev) +{ + struct falcon_gpio_port *gpio_port; + int ret, i; + struct resource *gpiores, *padres; + int irq; + + if (pdev->id >= MAX_PORTS) + return -ENODEV; + + gpiores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + padres = platform_get_resource(pdev, IORESOURCE_MEM, 1); + irq = platform_get_irq(pdev, 0); + if (!gpiores || !padres) + return -ENODEV; + + gpio_port = <q_gpio_port[pdev->id]; + gpio_port->gpio_chip.label = "falcon-gpio"; + gpio_port->gpio_chip.direction_input = falcon_gpio_direction_input; + gpio_port->gpio_chip.direction_output = falcon_gpio_direction_output; + gpio_port->gpio_chip.get = falcon_gpio_get; + gpio_port->gpio_chip.set = falcon_gpio_set; + gpio_port->gpio_chip.request = falcon_gpio_request; + gpio_port->gpio_chip.free = falcon_gpio_free; + gpio_port->gpio_chip.base = 100 * pdev->id; + gpio_port->gpio_chip.ngpio = 32; + gpio_port->gpio_chip.dev = &pdev->dev; + + gpio_port->port = ltq_remap_resource(gpiores); + gpio_port->pad = ltq_remap_resource(padres); + + if (!gpio_port->port || !gpio_port->pad) { + dev_err(&pdev->dev, "Could not map io ranges\n"); + ret = -ENOMEM; + goto err; + } + + gpio_port->clk = clk_get(&pdev->dev, NULL); + if (IS_ERR(gpio_port->clk)) { + dev_err(&pdev->dev, "Could not get clock\n"); + ret = PTR_ERR(gpio_port->clk);; + goto err; + } + clk_enable(gpio_port->clk); + + if (irq > 0) { + /* irq_chip support */ + gpio_port->gpio_chip.to_irq = falcon_gpio_to_irq; + gpio_port->irq_base = INT_NUM_EXTRA_START + (32 * pdev->id); + + for (i = 0; i < 32; i++) { + irq_set_chip_and_handler_name(gpio_port->irq_base + i, + &falcon_gpio_irq_chip, handle_simple_irq, + "mux"); + irq_set_chip_data(gpio_port->irq_base + i, gpio_port); + /* set to negative logic (falling edge, low level) */ + ltq_port_w32_mask(gpio_port, 0, 1 << i, + LTQ_GPIO_EXINTCR0); + } + + gpio_port->chained_irq = irq; + setup_irq(irq, &gpio_cascade); + irq_set_handler_data(irq, gpio_port); + irq_set_chained_handler(irq, falcon_gpio_irq_handler); + } + + ret = gpiochip_add(&gpio_port->gpio_chip); + if (ret < 0) { + dev_err(&pdev->dev, "Could not register gpiochip %d, %d\n", + pdev->id, ret); + goto err; + } + platform_set_drvdata(pdev, gpio_port); + return ret; + +err: + dev_err(&pdev->dev, "Error in gpio_probe %d, %d\n", pdev->id, ret); + if (gpiores) + release_resource(gpiores); + if (padres) + release_resource(padres); + + if (gpio_port->port) + iounmap(gpio_port->port); + if (gpio_port->pad) + iounmap(gpio_port->pad); + return ret; +} + +static struct platform_driver falcon_gpio_driver = { + .probe = falcon_gpio_probe, + .driver = { + .name = "falcon_gpio", + .owner = THIS_MODULE, + }, +}; + +int __init +falcon_gpio_init(void) +{ + int ret; + + pr_info("FALC(tm) ON GPIO Driver, (C) 2011 Lantiq Deutschland Gmbh\n"); + ret = platform_driver_register(&falcon_gpio_driver); + if (ret) + pr_err("falcon_gpio: Error registering platform driver!"); + return ret; +} + +postcore_initcall(falcon_gpio_init); |