--- /dev/null
+From 02d9df56be1ba23c7bec51c94e5d2ac0d13d2d78 Mon Sep 17 00:00:00 2001
+From: John Crispin <blogic@openwrt.org>
+Date: Thu, 11 Aug 2011 14:35:02 +0200
+Subject: [PATCH 07/24] MIPS: lantiq: add support for FALC-ON GPIOs
+
+FALC-ON uses a different GPIO core than the other Lantiq SoCs. This patch adds
+the new driver.
+
+Signed-off-by: Thomas Langer <thomas.langer@lantiq.com>
+Signed-off-by: John Crispin <blogic@openwrt.org>
+Cc: linux-mips@linux-mips.org
+---
+ arch/mips/lantiq/falcon/Makefile | 2 +-
+ arch/mips/lantiq/falcon/devices.c | 41 ++++
+ arch/mips/lantiq/falcon/devices.h | 2 +
+ arch/mips/lantiq/falcon/gpio.c | 398 +++++++++++++++++++++++++++++++++++++
+ 4 files changed, 442 insertions(+), 1 deletions(-)
+ create mode 100644 arch/mips/lantiq/falcon/gpio.c
+
+--- a/arch/mips/lantiq/falcon/Makefile
++++ b/arch/mips/lantiq/falcon/Makefile
+@@ -1 +1 @@
+-obj-y := clk.o prom.o reset.o sysctrl.o devices.o
++obj-y := clk.o prom.o reset.o sysctrl.o devices.o gpio.o
+--- a/arch/mips/lantiq/falcon/devices.c
++++ b/arch/mips/lantiq/falcon/devices.c
+@@ -9,6 +9,7 @@
+
+ #include <linux/platform_device.h>
+ #include <linux/mtd/nand.h>
++#include <linux/gpio.h>
+
+ #include <lantiq_soc.h>
+
+@@ -85,3 +86,43 @@ falcon_register_nand(void)
+ {
+ platform_device_register(<q_flash_nand);
+ }
++
++/* gpio */
++#define DECLARE_GPIO_RES(port) \
++static struct resource falcon_gpio ## port ## _res[] = { \
++ MEM_RES("gpio"#port, LTQ_GPIO ## port ## _BASE_ADDR, \
++ LTQ_GPIO ## port ## _SIZE), \
++ MEM_RES("padctrl"#port, LTQ_PADCTRL ## port ## _BASE_ADDR, \
++ LTQ_PADCTRL ## port ## _SIZE), \
++ IRQ_RES("gpio_mux"#port, FALCON_IRQ_GPIO_P ## port) \
++}
++DECLARE_GPIO_RES(0);
++DECLARE_GPIO_RES(1);
++DECLARE_GPIO_RES(2);
++DECLARE_GPIO_RES(3);
++DECLARE_GPIO_RES(4);
++
++void __init
++falcon_register_gpio(void)
++{
++ platform_device_register_simple("falcon_gpio", 0,
++ falcon_gpio0_res, ARRAY_SIZE(falcon_gpio0_res));
++ platform_device_register_simple("falcon_gpio", 1,
++ falcon_gpio1_res, ARRAY_SIZE(falcon_gpio1_res));
++ platform_device_register_simple("falcon_gpio", 2,
++ falcon_gpio2_res, ARRAY_SIZE(falcon_gpio2_res));
++ ltq_sysctl_activate(SYSCTL_SYS1, ACTS_PADCTRL1 | ACTS_P1);
++ ltq_sysctl_activate(SYSCTL_SYSETH, ACTS_PADCTRL0 |
++ ACTS_PADCTRL2 | ACTS_P0 | ACTS_P2);
++}
++
++void __init
++falcon_register_gpio_extra(void)
++{
++ platform_device_register_simple("falcon_gpio", 3,
++ falcon_gpio3_res, ARRAY_SIZE(falcon_gpio3_res));
++ platform_device_register_simple("falcon_gpio", 4,
++ falcon_gpio4_res, ARRAY_SIZE(falcon_gpio4_res));
++ ltq_sysctl_activate(SYSCTL_SYS1,
++ ACTS_PADCTRL3 | ACTS_PADCTRL4 | ACTS_P3 | ACTS_P4);
++}
+--- a/arch/mips/lantiq/falcon/devices.h
++++ b/arch/mips/lantiq/falcon/devices.h
+@@ -14,5 +14,7 @@
+ #include "../devices.h"
+
+ extern void falcon_register_nand(void);
++extern void falcon_register_gpio(void);
++extern void falcon_register_gpio_extra(void);
+
+ #endif
+--- /dev/null
++++ b/arch/mips/lantiq/falcon/gpio.c
+@@ -0,0 +1,398 @@
++/*
++ * 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/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;
++};
++
++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(unsigned int pin, unsigned int val,
++ 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 (gpio_request(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, val);
++}
++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;
++ }
++
++ 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);
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