diff options
Diffstat (limited to 'target/linux/lantiq/patches-3.8/0021-GPIO-MIPS-add-gpio-driver-for-falcon-SoC.patch')
| -rw-r--r-- | target/linux/lantiq/patches-3.8/0021-GPIO-MIPS-add-gpio-driver-for-falcon-SoC.patch | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/target/linux/lantiq/patches-3.8/0021-GPIO-MIPS-add-gpio-driver-for-falcon-SoC.patch b/target/linux/lantiq/patches-3.8/0021-GPIO-MIPS-add-gpio-driver-for-falcon-SoC.patch new file mode 100644 index 0000000000..a6d3259ec9 --- /dev/null +++ b/target/linux/lantiq/patches-3.8/0021-GPIO-MIPS-add-gpio-driver-for-falcon-SoC.patch @@ -0,0 +1,404 @@ +From ff3d0dd789882ad552a5224d34e5db426e1c45fe Mon Sep 17 00:00:00 2001 +From: John Crispin <blogic@openwrt.org> +Date: Sat, 23 Jun 2012 15:32:33 +0200 +Subject: [PATCH 21/40] GPIO: MIPS: 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: John Crispin <blogic@openwrt.org> +Signed-off-by: Thomas Langer <thomas.langer@lantiq.com> +Cc: linux-kernel@vger.kernel.org +--- + drivers/gpio/Kconfig | 5 + + drivers/gpio/Makefile | 1 + + drivers/gpio/gpio-falcon.c | 349 ++++++++++++++++++++++++++++++++++++++++++++ + 3 files changed, 355 insertions(+) + create mode 100644 drivers/gpio/gpio-falcon.c + +diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig +index 682de75..e8d84fa 100644 +--- a/drivers/gpio/Kconfig ++++ b/drivers/gpio/Kconfig +@@ -133,6 +133,11 @@ 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 +diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile +index c5aebd0..9bdbb91 100644 +--- a/drivers/gpio/Makefile ++++ b/drivers/gpio/Makefile +@@ -24,6 +24,7 @@ obj-$(CONFIG_GPIO_DA9055) += gpio-da9055.o + obj-$(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-$(CONFIG_GPIO_ICH) += gpio-ich.o + obj-$(CONFIG_GPIO_IT8761E) += gpio-it8761e.o +diff --git a/drivers/gpio/gpio-falcon.c b/drivers/gpio/gpio-falcon.c +new file mode 100644 +index 0000000..ae8b55d +--- /dev/null ++++ b/drivers/gpio/gpio-falcon.c +@@ -0,0 +1,349 @@ ++/* ++ * 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_PORTS 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 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 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 */ ++ 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_PORTS) ++ 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; ++ } ++ ++ gpiores = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ if (!gpiores) ++ return -ENODEV; ++ ++ 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 = -1; ++ gpio_port->gpio_chip.ngpio = size; ++ gpio_port->gpio_chip.dev = &pdev->dev; ++ ++ gpio_port->port = devm_request_and_ioremap(&pdev->dev, gpiores); ++ if (!gpio_port->port) { ++ dev_err(&pdev->dev, "Could not map io ranges\n"); ++ return -ENOMEM; ++ } ++ ++ gpio_port->clk = clk_get(&pdev->dev, NULL); ++ if (IS_ERR(gpio_port->clk)) { ++ dev_err(&pdev->dev, "Could not get clock\n"); ++ return PTR_ERR(gpio_port->clk); ++ } ++ clk_enable(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) ++ 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->npins = gpio_port->gpio_chip.ngpio; ++ gpio_range->gc = &gpio_port->gpio_chip; ++ pinctrl_falcon_add_gpio_range(gpio_range); ++ ++ return ret; ++} ++ ++static const struct of_device_id falcon_gpio_match[] = { ++ { .compatible = "lantiq,gpio-falcon" }, ++ {}, ++}; ++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); +-- +1.7.10.4 + |