[PATCH V2 5/6] GPIO: MIPS: add gpio driver for falcon SoC
From: John Crispin
Date: Tue Jul 24 2012 - 04:27:10 EST
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@xxxxxxxxxxx>
Signed-off-by: Thomas Langer <thomas.langer@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
Changes in V2
* fix typo in the subject line
arch/mips/include/asm/mach-lantiq/gpio.h | 4 +
drivers/gpio/Kconfig | 5 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-falcon.c | 355 ++++++++++++++++++++++++++++++
4 files changed, 365 insertions(+), 0 deletions(-)
create mode 100644 drivers/gpio/gpio-falcon.c
diff --git a/arch/mips/include/asm/mach-lantiq/gpio.h b/arch/mips/include/asm/mach-lantiq/gpio.h
index f79505b..fdc8638 100644
--- a/arch/mips/include/asm/mach-lantiq/gpio.h
+++ b/arch/mips/include/asm/mach-lantiq/gpio.h
@@ -1,10 +1,14 @@
#ifndef __ASM_MIPS_MACH_LANTIQ_GPIO_H
#define __ASM_MIPS_MACH_LANTIQ_GPIO_H
+#ifndef CONFIG_SOC_FALCON
static inline int gpio_to_irq(unsigned int gpio)
{
return -1;
}
+#else
+extern int gpio_to_irq(unsigned int gpio);
+#endif
#define gpio_get_value __gpio_get_value
#define gpio_set_value __gpio_set_value
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 502b5ea..f083a8a 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -114,6 +114,11 @@ 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 d370481..fbf2c51 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_GPIO_DA9052) += gpio-da9052.o
obj-$(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..e0ff32c
--- /dev/null
+++ b/drivers/gpio/gpio-falcon.c
@@ -0,0 +1,355 @@
+/*
+ * 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@xxxxxxxxxx>
+ * Copyright (C) 2012 John Crispin <blogic@xxxxxxxxxxx>
+ */
+
+#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];
+};
+
+int gpio_to_irq(unsigned int gpio)
+{
+ return __gpio_to_irq(gpio);
+}
+EXPORT_SYMBOL(gpio_to_irq);
+
+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);
--
1.7.9.1
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