+++ /dev/null
-// SPDX-License-Identifier: GPL-2.0-only
-/*
- * arch/arm/mach-ks8695/gpio.c
- *
- * Copyright (C) 2006 Andrew Victor
- * Updated to GPIOLIB, Copyright 2008 Simtec Electronics
- * Daniel Silverstone <dsilvers@simtec.co.uk>
- */
-#include <linux/gpio/driver.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <linux/module.h>
-#include <linux/io.h>
-
-#include <mach/hardware.h>
-#include <asm/mach/irq.h>
-
-#include <mach/regs-gpio.h>
-#include <mach/gpio-ks8695.h>
-
-/*
- * Configure a GPIO line for either GPIO function, or its internal
- * function (Interrupt, Timer, etc).
- */
-static void ks8695_gpio_mode(unsigned int pin, short gpio)
-{
- unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
- unsigned long x, flags;
-
- if (pin > KS8695_GPIO_5) /* only GPIO 0..5 have internal functions */
- return;
-
- local_irq_save(flags);
-
- x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
- if (gpio) /* GPIO: set bit to 0 */
- x &= ~enable[pin];
- else /* Internal function: set bit to 1 */
- x |= enable[pin];
- __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPC);
-
- local_irq_restore(flags);
-}
-
-
-static unsigned short gpio_irq[] = { KS8695_IRQ_EXTERN0, KS8695_IRQ_EXTERN1, KS8695_IRQ_EXTERN2, KS8695_IRQ_EXTERN3 };
-
-/*
- * Configure GPIO pin as external interrupt source.
- */
-int ks8695_gpio_interrupt(unsigned int pin, unsigned int type)
-{
- unsigned long x, flags;
-
- if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
- return -EINVAL;
-
- local_irq_save(flags);
-
- /* set pin as input */
- x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
- x &= ~IOPM(pin);
- __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
-
- local_irq_restore(flags);
-
- /* Set IRQ triggering type */
- irq_set_irq_type(gpio_irq[pin], type);
-
- /* enable interrupt mode */
- ks8695_gpio_mode(pin, 0);
-
- return 0;
-}
-EXPORT_SYMBOL(ks8695_gpio_interrupt);
-
-
-
-/* .... Generic GPIO interface .............................................. */
-
-/*
- * Configure the GPIO line as an input.
- */
-static int ks8695_gpio_direction_input(struct gpio_chip *gc, unsigned int pin)
-{
- unsigned long x, flags;
-
- if (pin > KS8695_GPIO_15)
- return -EINVAL;
-
- /* set pin to GPIO mode */
- ks8695_gpio_mode(pin, 1);
-
- local_irq_save(flags);
-
- /* set pin as input */
- x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
- x &= ~IOPM(pin);
- __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
-
- local_irq_restore(flags);
-
- return 0;
-}
-
-
-/*
- * Configure the GPIO line as an output, with default state.
- */
-static int ks8695_gpio_direction_output(struct gpio_chip *gc,
- unsigned int pin, int state)
-{
- unsigned long x, flags;
-
- if (pin > KS8695_GPIO_15)
- return -EINVAL;
-
- /* set pin to GPIO mode */
- ks8695_gpio_mode(pin, 1);
-
- local_irq_save(flags);
-
- /* set line state */
- x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
- if (state)
- x |= IOPD(pin);
- else
- x &= ~IOPD(pin);
- __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
-
- /* set pin as output */
- x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
- x |= IOPM(pin);
- __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPM);
-
- local_irq_restore(flags);
-
- return 0;
-}
-
-
-/*
- * Set the state of an output GPIO line.
- */
-static void ks8695_gpio_set_value(struct gpio_chip *gc,
- unsigned int pin, int state)
-{
- unsigned long x, flags;
-
- if (pin > KS8695_GPIO_15)
- return;
-
- local_irq_save(flags);
-
- /* set output line state */
- x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
- if (state)
- x |= IOPD(pin);
- else
- x &= ~IOPD(pin);
- __raw_writel(x, KS8695_GPIO_VA + KS8695_IOPD);
-
- local_irq_restore(flags);
-}
-
-
-/*
- * Read the state of a GPIO line.
- */
-static int ks8695_gpio_get_value(struct gpio_chip *gc, unsigned int pin)
-{
- unsigned long x;
-
- if (pin > KS8695_GPIO_15)
- return -EINVAL;
-
- x = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
- return (x & IOPD(pin)) != 0;
-}
-
-
-/*
- * Map GPIO line to IRQ number.
- */
-static int ks8695_gpio_to_irq(struct gpio_chip *gc, unsigned int pin)
-{
- if (pin > KS8695_GPIO_3) /* only GPIO 0..3 can generate IRQ */
- return -EINVAL;
-
- return gpio_irq[pin];
-}
-
-/* GPIOLIB interface */
-
-static struct gpio_chip ks8695_gpio_chip = {
- .label = "KS8695",
- .direction_input = ks8695_gpio_direction_input,
- .direction_output = ks8695_gpio_direction_output,
- .get = ks8695_gpio_get_value,
- .set = ks8695_gpio_set_value,
- .to_irq = ks8695_gpio_to_irq,
- .base = 0,
- .ngpio = 16,
- .can_sleep = false,
-};
-
-/* Register the GPIOs */
-void ks8695_register_gpios(void)
-{
- if (gpiochip_add_data(&ks8695_gpio_chip, NULL))
- printk(KERN_ERR "Unable to register core GPIOs\n");
-}
-
-/* .... Debug interface ..................................................... */
-
-#ifdef CONFIG_DEBUG_FS
-
-static int ks8695_gpio_show(struct seq_file *s, void *unused)
-{
- unsigned int enable[] = { IOPC_IOEINT0EN, IOPC_IOEINT1EN, IOPC_IOEINT2EN, IOPC_IOEINT3EN, IOPC_IOTIM0EN, IOPC_IOTIM1EN };
- unsigned int intmask[] = { IOPC_IOEINT0TM, IOPC_IOEINT1TM, IOPC_IOEINT2TM, IOPC_IOEINT3TM };
- unsigned long mode, ctrl, data;
- int i;
-
- mode = __raw_readl(KS8695_GPIO_VA + KS8695_IOPM);
- ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);
- data = __raw_readl(KS8695_GPIO_VA + KS8695_IOPD);
-
- seq_printf(s, "Pin\tI/O\tFunction\tState\n\n");
-
- for (i = KS8695_GPIO_0; i <= KS8695_GPIO_15 ; i++) {
- seq_printf(s, "%i:\t", i);
-
- seq_printf(s, "%s\t", (mode & IOPM(i)) ? "Output" : "Input");
-
- if (i <= KS8695_GPIO_3) {
- if (ctrl & enable[i]) {
- seq_printf(s, "EXT%i ", i);
-
- switch ((ctrl & intmask[i]) >> (4 * i)) {
- case IOPC_TM_LOW:
- seq_printf(s, "(Low)"); break;
- case IOPC_TM_HIGH:
- seq_printf(s, "(High)"); break;
- case IOPC_TM_RISING:
- seq_printf(s, "(Rising)"); break;
- case IOPC_TM_FALLING:
- seq_printf(s, "(Falling)"); break;
- case IOPC_TM_EDGE:
- seq_printf(s, "(Edges)"); break;
- }
- } else
- seq_printf(s, "GPIO\t");
- } else if (i <= KS8695_GPIO_5) {
- if (ctrl & enable[i])
- seq_printf(s, "TOUT%i\t", i - KS8695_GPIO_4);
- else
- seq_printf(s, "GPIO\t");
- } else {
- seq_printf(s, "GPIO\t");
- }
-
- seq_printf(s, "\t");
-
- seq_printf(s, "%i\n", (data & IOPD(i)) ? 1 : 0);
- }
- return 0;
-}
-
-DEFINE_SHOW_ATTRIBUTE(ks8695_gpio);
-
-static int __init ks8695_gpio_debugfs_init(void)
-{
- /* /sys/kernel/debug/ks8695_gpio */
- debugfs_create_file("ks8695_gpio", S_IFREG | S_IRUGO, NULL, NULL,
- &ks8695_gpio_fops);
- return 0;
-}
-postcore_initcall(ks8695_gpio_debugfs_init);
-
-#endif
projects / openwrt / staging / blogic.git / commitdiff