diff options
Diffstat (limited to 'target/linux/adm5120/files-3.8/arch/mips/adm5120/common/gpio.c')
-rw-r--r-- | target/linux/adm5120/files-3.8/arch/mips/adm5120/common/gpio.c | 330 |
1 files changed, 330 insertions, 0 deletions
diff --git a/target/linux/adm5120/files-3.8/arch/mips/adm5120/common/gpio.c b/target/linux/adm5120/files-3.8/arch/mips/adm5120/common/gpio.c new file mode 100644 index 0000000..e60ed7a --- /dev/null +++ b/target/linux/adm5120/files-3.8/arch/mips/adm5120/common/gpio.c @@ -0,0 +1,330 @@ +/* + * ADM5120 generic GPIO API support via GPIOLIB + * + * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org> + * + * 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. + * + */ + +#include <linux/init.h> +#include <linux/types.h> +#include <linux/module.h> +#include <linux/irq.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/io.h> +#include <linux/gpio.h> + +#include <asm/addrspace.h> + +#include <asm/mach-adm5120/adm5120_defs.h> +#include <asm/mach-adm5120/adm5120_info.h> +#include <asm/mach-adm5120/adm5120_switch.h> + +#define GPIO_REG(r) (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE) + r) + +struct gpio1_desc { + void __iomem *reg; /* register address */ + u8 iv_shift; /* shift amount for input bit */ + u8 mode_shift; /* shift amount for mode bits */ +}; + +#define GPIO1_DESC(p, l) { \ + .reg = GPIO_REG(SWITCH_REG_PORT0_LED + ((p) * 4)), \ + .iv_shift = LED0_IV_SHIFT + (l), \ + .mode_shift = (l) * 4 \ + } + +static struct gpio1_desc gpio1_table[15] = { + GPIO1_DESC(0, 0), GPIO1_DESC(0, 1), GPIO1_DESC(0, 2), + GPIO1_DESC(1, 0), GPIO1_DESC(1, 1), GPIO1_DESC(1, 2), + GPIO1_DESC(2, 0), GPIO1_DESC(2, 1), GPIO1_DESC(2, 2), + GPIO1_DESC(3, 0), GPIO1_DESC(3, 1), GPIO1_DESC(3, 2), + GPIO1_DESC(4, 0), GPIO1_DESC(4, 1), GPIO1_DESC(4, 2) +}; + +static u32 gpio_conf2; + +int adm5120_gpio_to_irq(unsigned gpio) +{ + int ret; + + switch (gpio) { + case ADM5120_GPIO_PIN2: + ret = ADM5120_IRQ_GPIO2; + break; + case ADM5120_GPIO_PIN4: + ret = ADM5120_IRQ_GPIO4; + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} +EXPORT_SYMBOL(adm5120_gpio_to_irq); + +int adm5120_irq_to_gpio(unsigned irq) +{ + int ret; + + switch (irq) { + case ADM5120_IRQ_GPIO2: + ret = ADM5120_GPIO_PIN2; + break; + case ADM5120_IRQ_GPIO4: + ret = ADM5120_GPIO_PIN4; + break; + default: + ret = -EINVAL; + break; + } + + return ret; +} +EXPORT_SYMBOL(adm5120_irq_to_gpio); + +/* + * Helpers for GPIO lines in GPIO_CONF0 register + */ +#define PIN_IM(p) ((1 << GPIO_CONF0_IM_SHIFT) << p) +#define PIN_IV(p) ((1 << GPIO_CONF0_IV_SHIFT) << p) +#define PIN_OE(p) ((1 << GPIO_CONF0_OE_SHIFT) << p) +#define PIN_OV(p) ((1 << GPIO_CONF0_OV_SHIFT) << p) + +int __adm5120_gpio0_get_value(unsigned offset) +{ + void __iomem **reg; + u32 t; + + reg = GPIO_REG(SWITCH_REG_GPIO_CONF0); + + t = __raw_readl(reg); + if ((t & PIN_IM(offset)) != 0) + t &= PIN_IV(offset); + else + t &= PIN_OV(offset); + + return (t) ? 1 : 0; +} +EXPORT_SYMBOL(__adm5120_gpio0_get_value); + +void __adm5120_gpio0_set_value(unsigned offset, int value) +{ + void __iomem **reg; + u32 t; + + reg = GPIO_REG(SWITCH_REG_GPIO_CONF0); + + t = __raw_readl(reg); + if (value == 0) + t &= ~(PIN_OV(offset)); + else + t |= PIN_OV(offset); + + __raw_writel(t, reg); +} +EXPORT_SYMBOL(__adm5120_gpio0_set_value); + +static int adm5120_gpio0_get_value(struct gpio_chip *chip, unsigned offset) +{ + return __adm5120_gpio0_get_value(offset); +} + +static void adm5120_gpio0_set_value(struct gpio_chip *chip, + unsigned offset, int value) +{ + __adm5120_gpio0_set_value(offset, value); +} + +static int adm5120_gpio0_direction_input(struct gpio_chip *chip, + unsigned offset) +{ + void __iomem **reg; + u32 t; + + reg = GPIO_REG(SWITCH_REG_GPIO_CONF0); + + t = __raw_readl(reg); + t &= ~(PIN_OE(offset)); + t |= PIN_IM(offset); + __raw_writel(t, reg); + + return 0; +} + +static int adm5120_gpio0_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + void __iomem **reg; + u32 t; + + reg = GPIO_REG(SWITCH_REG_GPIO_CONF0); + + t = __raw_readl(reg); + t &= ~(PIN_IM(offset) | PIN_OV(offset)); + t |= PIN_OE(offset); + + if (value) + t |= PIN_OV(offset); + + __raw_writel(t, reg); + + return 0; +} + +static struct gpio_chip adm5120_gpio0_chip = { + .label = "adm5120 gpio0", + .get = adm5120_gpio0_get_value, + .set = adm5120_gpio0_set_value, + .direction_input = adm5120_gpio0_direction_input, + .direction_output = adm5120_gpio0_direction_output, + .base = ADM5120_GPIO_PIN0, + .ngpio = ADM5120_GPIO_PIN7 - ADM5120_GPIO_PIN0 + 1, +}; + +int __adm5120_gpio1_get_value(unsigned offset) +{ + void __iomem **reg; + u32 t, m; + + reg = gpio1_table[offset].reg; + + t = __raw_readl(reg); + m = (t >> gpio1_table[offset].mode_shift) & LED_MODE_MASK; + if (m == LED_MODE_INPUT) + return (t >> gpio1_table[offset].iv_shift) & 1; + + if (m == LED_MODE_OUT_LOW) + return 0; + + return 1; +} +EXPORT_SYMBOL(__adm5120_gpio1_get_value); + +void __adm5120_gpio1_set_value(unsigned offset, int value) +{ + void __iomem **reg; + u32 t, s; + + reg = gpio1_table[offset].reg; + s = gpio1_table[offset].mode_shift; + + t = __raw_readl(reg); + t &= ~(LED_MODE_MASK << s); + + switch (value) { + case ADM5120_GPIO_LOW: + t |= (LED_MODE_OUT_LOW << s); + break; + case ADM5120_GPIO_FLASH: + case ADM5120_GPIO_LINK: + case ADM5120_GPIO_SPEED: + case ADM5120_GPIO_DUPLEX: + case ADM5120_GPIO_ACT: + case ADM5120_GPIO_COLL: + case ADM5120_GPIO_LINK_ACT: + case ADM5120_GPIO_DUPLEX_COLL: + case ADM5120_GPIO_10M_ACT: + case ADM5120_GPIO_100M_ACT: + t |= ((value & LED_MODE_MASK) << s); + break; + default: + t |= (LED_MODE_OUT_HIGH << s); + break; + } + + __raw_writel(t, reg); +} +EXPORT_SYMBOL(__adm5120_gpio1_set_value); + +static int adm5120_gpio1_get_value(struct gpio_chip *chip, unsigned offset) +{ + return __adm5120_gpio1_get_value(offset); +} + +static void adm5120_gpio1_set_value(struct gpio_chip *chip, + unsigned offset, int value) +{ + __adm5120_gpio1_set_value(offset, value); +} + +static int adm5120_gpio1_direction_input(struct gpio_chip *chip, + unsigned offset) +{ + void __iomem **reg; + u32 t; + + reg = gpio1_table[offset].reg; + t = __raw_readl(reg); + t &= ~(LED_MODE_MASK << gpio1_table[offset].mode_shift); + __raw_writel(t, reg); + + return 0; +} + +static int adm5120_gpio1_direction_output(struct gpio_chip *chip, + unsigned offset, int value) +{ + __adm5120_gpio1_set_value(offset, value); + return 0; +} + +static struct gpio_chip adm5120_gpio1_chip = { + .label = "adm5120 gpio1", + .get = adm5120_gpio1_get_value, + .set = adm5120_gpio1_set_value, + .direction_input = adm5120_gpio1_direction_input, + .direction_output = adm5120_gpio1_direction_output, + .base = ADM5120_GPIO_P0L0, + .ngpio = ADM5120_GPIO_P4L2 - ADM5120_GPIO_P0L0 + 1, +}; + +void __init adm5120_gpio_csx0_enable(void) +{ + gpio_conf2 |= GPIO_CONF2_CSX0; + SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2); + + gpio_request(ADM5120_GPIO_PIN1, "CSX0"); +} + +void __init adm5120_gpio_csx1_enable(void) +{ + gpio_conf2 |= GPIO_CONF2_CSX1; + SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2); + + gpio_request(ADM5120_GPIO_PIN3, "CSX1"); +} + +void __init adm5120_gpio_ew_enable(void) +{ + gpio_conf2 |= GPIO_CONF2_EW; + SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2); + + gpio_request(ADM5120_GPIO_PIN0, "EW"); +} + +void __init adm5120_gpio_init(void) +{ + int err; + + SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2); + + if (adm5120_package_pqfp()) { + gpiochip_reserve(ADM5120_GPIO_PIN4, 4); + adm5120_gpio0_chip.ngpio = 4; + } + + err = gpiochip_add(&adm5120_gpio0_chip); + if (err) + panic("cannot add ADM5120 GPIO0 chip, error=%d", err); + + err = gpiochip_add(&adm5120_gpio1_chip); + if (err) + panic("cannot add ADM5120 GPIO1 chip, error=%d", err); + +} |