From 4cc24d8a9ac15aceadf2449473494f947c1ead72 Mon Sep 17 00:00:00 2001 From: Thomas Langer <thomas.langer@lantiq.com> Date: Thu, 8 Aug 2013 16:19:15 +0200 Subject: [PATCH 24/34] GPIO: MIPS: lantiq: add gpio driver for falcon SoC Add driver for GPIO blocks found on Lantiq FALCON SoC. The SoC has 5 banks of up to 32 pads. The GPIO blocks have a per pin IRQs. Signed-off-by: Thomas Langer <thomas.langer@lantiq.com> Acked-by: John Crispin <blogic@openwrt.org> Cc: linux-mips@linux-mips.org Cc: linux-gpio@vger.kernel.org --- drivers/gpio/Kconfig | 5 + drivers/gpio/Makefile | 1 + drivers/gpio/gpio-falcon.c | 348 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 354 insertions(+) create mode 100644 drivers/gpio/gpio-falcon.c --- a/drivers/gpio/Kconfig +++ b/drivers/gpio/Kconfig @@ -135,6 +135,11 @@ config GPIO_EP93XX depends on ARCH_EP93XX select GPIO_GENERIC +config GPIO_FALCON + def_bool y + depends on MIPS && SOC_FALCON + select GPIO_GENERIC + config GPIO_MM_LANTIQ bool "Lantiq Memory mapped GPIOs" depends on LANTIQ && SOC_XWAY --- a/drivers/gpio/Makefile +++ b/drivers/gpio/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_DA9055) += gpio-da9055 obj-$(CONFIG_ARCH_DAVINCI) += gpio-davinci.o obj-$(CONFIG_GPIO_EM) += gpio-em.o obj-$(CONFIG_GPIO_EP93XX) += gpio-ep93xx.o +obj-$(CONFIG_GPIO_FALCON) += gpio-falcon.o obj-$(CONFIG_GPIO_GE_FPGA) += gpio-ge.o obj-$(CONFIG_GPIO_GRGPIO) += gpio-grgpio.o obj-$(CONFIG_GPIO_ICH) += gpio-ich.o --- /dev/null +++ b/drivers/gpio/gpio-falcon.c @@ -0,0 +1,348 @@ +/* + * 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) 2012 Thomas Langer <thomas.langer@lantiq.com> + * Copyright (C) 2012 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/module.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/pinctrl/pinctrl.h> +#include <linux/pinctrl/consumer.h> +#include <linux/platform_device.h> + +#include <lantiq_soc.h> + +/* Data Output Register */ +#define GPIO_OUT 0x00000000 +/* Data Input Register */ +#define GPIO_IN 0x00000004 +/* Direction Register */ +#define GPIO_DIR 0x00000008 +/* External Interrupt Control Register 0 */ +#define GPIO_EXINTCR0 0x00000018 +/* External Interrupt Control Register 1 */ +#define GPIO_EXINTCR1 0x0000001C +/* IRN Capture Register */ +#define GPIO_IRNCR 0x00000020 +/* IRN Interrupt Configuration Register */ +#define GPIO_IRNCFG 0x0000002C +/* IRN Interrupt Enable Set Register */ +#define GPIO_IRNRNSET 0x00000030 +/* IRN Interrupt Enable Clear Register */ +#define GPIO_IRNENCLR 0x00000034 +/* Output Set Register */ +#define GPIO_OUTSET 0x00000040 +/* Output Cler Register */ +#define GPIO_OUTCLR 0x00000044 +/* Direction Clear Register */ +#define GPIO_DIRSET 0x00000048 +/* Direction Set Register */ +#define 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 port_r32(p, reg) ltq_r32(p->port + reg) +#define port_w32(p, val, reg) ltq_w32(val, p->port + reg) +#define port_w32_mask(p, clear, set, reg) \ + port_w32(p, (port_r32(p, reg) & ~(clear)) | (set), reg) + +#define MAX_BANKS 5 +#define PINS_PER_PORT 32 + +struct falcon_gpio_port { + struct gpio_chip gpio_chip; + void __iomem *port; + unsigned int irq_base; + unsigned int chained_irq; + struct clk *clk; + char name[6]; +}; + +static struct irq_chip falcon_gpio_irq_chip; + +static int falcon_gpio_direction_input(struct gpio_chip *chip, + unsigned int offset) +{ + port_w32(ctop(chip), 1 << offset, GPIO_DIRCLR); + + return 0; +} + +static void falcon_gpio_set(struct gpio_chip *chip, unsigned int offset, + int value) +{ + if (value) + port_w32(ctop(chip), 1 << offset, GPIO_OUTSET); + else + port_w32(ctop(chip), 1 << offset, GPIO_OUTCLR); +} + +static int falcon_gpio_direction_output(struct gpio_chip *chip, + unsigned int offset, int value) +{ + falcon_gpio_set(chip, offset, value); + port_w32(ctop(chip), 1 << offset, GPIO_DIRSET); + + return 0; +} + +static int falcon_gpio_get(struct gpio_chip *chip, unsigned int offset) +{ + if ((port_r32(ctop(chip), GPIO_DIR) >> offset) & 1) + return (port_r32(ctop(chip), GPIO_OUT) >> offset) & 1; + else + return (port_r32(ctop(chip), GPIO_IN) >> offset) & 1; +} + +static int falcon_gpio_request(struct gpio_chip *chip, unsigned offset) +{ + int gpio = chip->base + offset; + + return pinctrl_request_gpio(gpio); +} + +static void falcon_gpio_free(struct gpio_chip *chip, unsigned offset) +{ + int gpio = chip->base + offset; + + pinctrl_free_gpio(gpio); +} + +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; + + port_w32(itop(d), 1 << offset, GPIO_IRNENCLR); +} + +static void falcon_gpio_enable_irq(struct irq_data *d) +{ + unsigned int offset = d->irq - itop(d)->irq_base; + + port_w32(itop(d), 1 << offset, GPIO_IRNRNSET); +} + +static void falcon_gpio_ack_irq(struct irq_data *d) +{ + unsigned int offset = d->irq - itop(d)->irq_base; + + port_w32(itop(d), 1 << offset, GPIO_IRNCR); +} + +static void falcon_gpio_mask_and_ack_irq(struct irq_data *d) +{ + unsigned int offset = d->irq - itop(d)->irq_base; + + port_w32(itop(d), 1 << offset, GPIO_IRNENCLR); + port_w32(itop(d), 1 << offset, GPIO_IRNCR); +} + +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 */ + port_w32_mask(itop(d), 0, mask, GPIO_IRNCFG); + irq_set_chip_and_handler_name(d->irq, + &falcon_gpio_irq_chip, handle_level_irq, "mux"); + } else { + /* edge triggered */ + port_w32_mask(itop(d), mask, 0, 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) { + port_w32_mask(itop(d), mask, 0, GPIO_EXINTCR0); + port_w32_mask(itop(d), 0, mask, GPIO_EXINTCR1); + } else { + if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH)) != 0) + /* positive logic: rising edge, high level */ + port_w32_mask(itop(d), mask, 0, GPIO_EXINTCR0); + else + /* negative logic: falling edge, low level */ + port_w32_mask(itop(d), 0, mask, GPIO_EXINTCR0); + port_w32_mask(itop(d), mask, 0, 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 = port_r32(gpio_port, GPIO_IRNCR); + port_w32(gpio_port, irncr, 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 int falcon_gpio_irq_map(struct irq_domain *d, unsigned int irq, + irq_hw_number_t hw) +{ + struct falcon_gpio_port *port = d->host_data; + + irq_set_chip_and_handler_name(irq, &falcon_gpio_irq_chip, + handle_simple_irq, "mux"); + irq_set_chip_data(irq, port); + + /* set to negative logic (falling edge, low level) */ + port_w32_mask(port, 0, 1 << hw, GPIO_EXINTCR0); + return 0; +} + +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 const struct irq_domain_ops irq_domain_ops = { + .xlate = irq_domain_xlate_onetwocell, + .map = falcon_gpio_irq_map, +}; + +static struct irqaction gpio_cascade = { + .handler = no_action, + .flags = IRQF_DISABLED, + .name = "gpio_cascade", +}; + +static int falcon_gpio_probe(struct platform_device *pdev) +{ + struct pinctrl_gpio_range *gpio_range; + struct device_node *node = pdev->dev.of_node; + const __be32 *bank = of_get_property(node, "lantiq,bank", NULL); + struct falcon_gpio_port *gpio_port; + struct resource *gpiores, irqres; + int ret, size; + + if (!bank || *bank >= MAX_BANKS) + return -ENODEV; + + size = pinctrl_falcon_get_range_size(*bank); + if (size < 1) { + dev_err(&pdev->dev, "pad not loaded for bank %d\n", *bank); + return size; + } + + gpio_range = devm_kzalloc(&pdev->dev, sizeof(struct pinctrl_gpio_range), + GFP_KERNEL); + if (!gpio_range) + return -ENOMEM; + + gpio_port = devm_kzalloc(&pdev->dev, sizeof(struct falcon_gpio_port), + GFP_KERNEL); + if (!gpio_port) + return -ENOMEM; + + snprintf(gpio_port->name, 6, "gpio%d", *bank); + gpio_port->gpio_chip.label = gpio_port->name; + 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 = *bank * PINS_PER_PORT; + gpio_port->gpio_chip.ngpio = size; + gpio_port->gpio_chip.dev = &pdev->dev; + + gpiores = platform_get_resource(pdev, IORESOURCE_MEM, 0); + gpio_port->port = devm_request_and_ioremap(&pdev->dev, gpiores); + if (IS_ERR(gpio_port->port)) + return PTR_ERR(gpio_port->port); + + gpio_port->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(gpio_port->clk)) + return PTR_ERR(gpio_port->clk); + clk_activate(gpio_port->clk); + + if (of_irq_to_resource_table(node, &irqres, 1) == 1) { + gpio_port->irq_base = INT_NUM_EXTRA_START + (32 * *bank); + gpio_port->gpio_chip.to_irq = falcon_gpio_to_irq; + gpio_port->chained_irq = irqres.start; + irq_domain_add_legacy(node, size, gpio_port->irq_base, 0, + &irq_domain_ops, gpio_port); + setup_irq(irqres.start, &gpio_cascade); + irq_set_handler_data(irqres.start, gpio_port); + irq_set_chained_handler(irqres.start, falcon_gpio_irq_handler); + } + + ret = gpiochip_add(&gpio_port->gpio_chip); + if (ret) + return ret; + + platform_set_drvdata(pdev, gpio_port); + + gpio_range->name = "FALCON GPIO"; + gpio_range->id = *bank; + gpio_range->base = gpio_port->gpio_chip.base; + gpio_range->pin_base = gpio_port->gpio_chip.base; + gpio_range->npins = gpio_port->gpio_chip.ngpio; + gpio_range->gc = &gpio_port->gpio_chip; + + pinctrl_falcon_add_gpio_range(gpio_range); + + return 0; +} + +static const struct of_device_id falcon_gpio_match[] = { + { .compatible = "lantiq,falcon-gpio" }, + {}, +}; +MODULE_DEVICE_TABLE(of, falcon_gpio_match); + +static struct platform_driver falcon_gpio_driver = { + .probe = falcon_gpio_probe, + .driver = { + .name = "gpio-falcon", + .owner = THIS_MODULE, + .of_match_table = falcon_gpio_match, + }, +}; + +int __init falcon_gpio_init(void) +{ + int ret; + + pr_info("FALC(tm) ON GPIO Driver, (C) 2012 Lantiq Deutschland Gmbh\n"); + ret = platform_driver_register(&falcon_gpio_driver); + if (ret) + pr_err("falcon_gpio: Error registering platform driver!"); + return ret; +} + +subsys_initcall(falcon_gpio_init);