| // 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 |