diff options
Diffstat (limited to 'target/linux/adm5120/files-2.6.26/arch/mips/adm5120/common/gpio.c')
| -rw-r--r-- | target/linux/adm5120/files-2.6.26/arch/mips/adm5120/common/gpio.c | 372 |
1 files changed, 372 insertions, 0 deletions
diff --git a/target/linux/adm5120/files-2.6.26/arch/mips/adm5120/common/gpio.c b/target/linux/adm5120/files-2.6.26/arch/mips/adm5120/common/gpio.c new file mode 100644 index 000000000..bce3dddf9 --- /dev/null +++ b/target/linux/adm5120/files-2.6.26/arch/mips/adm5120/common/gpio.c @@ -0,0 +1,372 @@ +/* + * ADM5120 generic GPIO API support + * + * 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/autoconf.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/module.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/io.h> + +#include <asm/addrspace.h> +#include <linux/gpio.h> + +#include <asm/mach-adm5120/adm5120_defs.h> +#include <asm/mach-adm5120/adm5120_info.h> +#include <asm/mach-adm5120/adm5120_switch.h> +#include <asm/mach-adm5120/adm5120_irq.h> + +#define GPIO_READ(r) __raw_readl((r)) +#define GPIO_WRITE(v, r) __raw_writel((v), (r)) +#define GPIO_REG(r) (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE)+r) + +struct adm5120_gpio_line { + u32 flags; + const char *label; + int irq; +}; + +#define GPIO_FLAG_VALID 0x01 +#define GPIO_FLAG_USED 0x02 + +struct led_desc { + void __iomem *reg; /* LED register address */ + u8 iv_shift; /* shift amount for input bit */ + u8 mode_shift; /* shift amount for mode bits */ +}; + +#define LED_DESC(p, l) { \ + .reg = GPIO_REG(SWITCH_REG_PORT0_LED+((p) * 4)), \ + .iv_shift = LED0_IV_SHIFT + (l), \ + .mode_shift = (l) * 4 \ + } + +static struct led_desc led_table[15] = { + LED_DESC(0, 0), LED_DESC(0, 1), LED_DESC(0, 2), + LED_DESC(1, 0), LED_DESC(1, 1), LED_DESC(1, 2), + LED_DESC(2, 0), LED_DESC(2, 1), LED_DESC(2, 2), + LED_DESC(3, 0), LED_DESC(3, 1), LED_DESC(3, 2), + LED_DESC(4, 0), LED_DESC(4, 1), LED_DESC(4, 2) +}; + +static struct adm5120_gpio_line adm5120_gpio_map[ADM5120_GPIO_COUNT]; + +static u32 gpio_conf2; + +/*-------------------------------------------------------------------------*/ + +static inline int gpio_is_invalid(unsigned gpio) +{ + if ((gpio > ADM5120_GPIO_MAX) || + (adm5120_gpio_map[gpio].flags & GPIO_FLAG_VALID) == 0) + return 1; + + return 0; +} + +static inline int gpio_is_used(unsigned gpio) +{ + return ((adm5120_gpio_map[gpio].flags & GPIO_FLAG_USED) != 0); +} + +/*-------------------------------------------------------------------------*/ + +/* + * 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) + +static inline int pins_direction_input(unsigned pin) +{ + void __iomem **reg; + u32 t; + + reg = GPIO_REG(SWITCH_REG_GPIO_CONF0); + + t = GPIO_READ(reg); + t &= ~(PIN_OE(pin)); + t |= PIN_IM(pin); + GPIO_WRITE(t, reg); + + return 0; +} + +static inline int pins_direction_output(unsigned pin, int value) +{ + void __iomem **reg; + u32 t; + + reg = GPIO_REG(SWITCH_REG_GPIO_CONF0); + + t = GPIO_READ(reg); + t &= ~(PIN_IM(pin) | PIN_OV(pin)); + t |= PIN_OE(pin); + + if (value) + t |= PIN_OV(pin); + + GPIO_WRITE(t, reg); + + return 0; +} + +static inline int pins_get_value(unsigned pin) +{ + void __iomem **reg; + u32 t; + + reg = GPIO_REG(SWITCH_REG_GPIO_CONF0); + + t = GPIO_READ(reg); + if ((t & PIN_IM(pin)) != 0) + t &= PIN_IV(pin); + else + t &= PIN_OV(pin); + + return (t) ? 1 : 0; +} + +static inline void pins_set_value(unsigned pin, int value) +{ + void __iomem **reg; + u32 t; + + reg = GPIO_REG(SWITCH_REG_GPIO_CONF0); + + t = GPIO_READ(reg); + if (value == 0) + t &= ~(PIN_OV(pin)); + else + t |= PIN_OV(pin); + + GPIO_WRITE(t, reg); +} + +/* + * Helpers for GPIO lines in PORTx_LED registers + */ +static inline int leds_direction_input(unsigned led) +{ + void __iomem **reg; + u32 t; + + reg = led_table[led].reg; + t = GPIO_READ(reg); + t &= ~(LED_MODE_MASK << led_table[led].mode_shift); + GPIO_WRITE(t, reg); + + return 0; +} + +static inline int leds_direction_output(unsigned led, int value) +{ + void __iomem **reg; + u32 t, s; + + reg = led_table[led].reg; + s = led_table[led].mode_shift; + + t = GPIO_READ(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; + } + + GPIO_WRITE(t, reg); + + return 0; +} + +static inline int leds_get_value(unsigned led) +{ + void __iomem **reg; + u32 t, m; + + reg = led_table[led].reg; + + t = GPIO_READ(reg); + m = (t >> led_table[led].mode_shift) & LED_MODE_MASK; + if (m == LED_MODE_INPUT) + return (t >> led_table[led].iv_shift) & 1; + + if (m == LED_MODE_OUT_LOW) + return 0; + + return 1; +} + +/*-------------------------------------------------------------------------*/ + +/* + * Main GPIO support routines + */ +int adm5120_gpio_direction_input(unsigned gpio) +{ + if (gpio_is_invalid(gpio)) + return -EINVAL; + + if (gpio < ADM5120_GPIO_P0L0) + return pins_direction_input(gpio); + + gpio -= ADM5120_GPIO_P0L0; + return leds_direction_input(gpio); +} +EXPORT_SYMBOL(adm5120_gpio_direction_input); + +int adm5120_gpio_direction_output(unsigned gpio, int value) +{ + if (gpio_is_invalid(gpio)) + return -EINVAL; + + if (gpio < ADM5120_GPIO_P0L0) + return pins_direction_output(gpio, value); + + gpio -= ADM5120_GPIO_P0L0; + return leds_direction_output(gpio, value); +} +EXPORT_SYMBOL(adm5120_gpio_direction_output); + +int adm5120_gpio_get_value(unsigned gpio) +{ + if (gpio < ADM5120_GPIO_P0L0) + return pins_get_value(gpio); + + gpio -= ADM5120_GPIO_P0L0; + return leds_get_value(gpio); +} +EXPORT_SYMBOL(adm5120_gpio_get_value); + +void adm5120_gpio_set_value(unsigned gpio, int value) +{ + if (gpio < ADM5120_GPIO_P0L0) { + pins_set_value(gpio, value); + return; + } + + gpio -= ADM5120_GPIO_P0L0; + leds_direction_output(gpio, value); +} +EXPORT_SYMBOL(adm5120_gpio_set_value); + +int adm5120_gpio_request(unsigned gpio, const char *label) +{ + if (gpio_is_invalid(gpio)) + return -EINVAL; + + if (gpio_is_used(gpio)) + return -EBUSY; + + adm5120_gpio_map[gpio].flags |= GPIO_FLAG_USED; + adm5120_gpio_map[gpio].label = label; + + return 0; +} +EXPORT_SYMBOL(adm5120_gpio_request); + +void adm5120_gpio_free(unsigned gpio) +{ + if (gpio_is_invalid(gpio)) + return; + + adm5120_gpio_map[gpio].flags &= ~GPIO_FLAG_USED; + adm5120_gpio_map[gpio].label = NULL; +} +EXPORT_SYMBOL(adm5120_gpio_free); + +int adm5120_gpio_to_irq(unsigned gpio) +{ + if (gpio > ADM5120_GPIO_MAX) + return -EINVAL; + + return adm5120_gpio_map[gpio].irq; +} +EXPORT_SYMBOL(adm5120_gpio_to_irq); + +int adm5120_irq_to_gpio(unsigned irq) +{ + int i; + + for (i = 0; i < ADM5120_GPIO_COUNT; i++) + if (adm5120_gpio_map[i].irq == irq) + return i; + + return -EINVAL; +} +EXPORT_SYMBOL(adm5120_irq_to_gpio); + +/*-------------------------------------------------------------------------*/ + +void __init adm5120_gpio_csx0_enable(void) +{ + gpio_conf2 |= GPIO_CONF2_CSX0; + SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2); + + adm5120_gpio_map[ADM5120_GPIO_PIN1].flags &= ~GPIO_FLAG_VALID; + adm5120_gpio_map[ADM5120_GPIO_PIN2].irq = ADM5120_IRQ_GPIO2; +} + +void __init adm5120_gpio_csx1_enable(void) +{ + gpio_conf2 |= GPIO_CONF2_CSX1; + SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2); + + adm5120_gpio_map[ADM5120_GPIO_PIN3].flags &= ~GPIO_FLAG_VALID; + if (adm5120_package_bga()) + adm5120_gpio_map[ADM5120_GPIO_PIN4].irq = ADM5120_IRQ_GPIO4; +} + +void __init adm5120_gpio_ew_enable(void) +{ + gpio_conf2 |= GPIO_CONF2_EW; + SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2); + + adm5120_gpio_map[ADM5120_GPIO_PIN0].flags &= ~GPIO_FLAG_VALID; +} + +void __init adm5120_gpio_init(void) +{ + int i; + + gpio_conf2 = 0; + SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2); + + for (i = 0; i < ADM5120_GPIO_COUNT; i++) + adm5120_gpio_map[i].flags = GPIO_FLAG_VALID; + + if (adm5120_package_pqfp()) { + adm5120_gpio_map[ADM5120_GPIO_PIN4].flags &= ~GPIO_FLAG_VALID; + adm5120_gpio_map[ADM5120_GPIO_PIN5].flags &= ~GPIO_FLAG_VALID; + adm5120_gpio_map[ADM5120_GPIO_PIN6].flags &= ~GPIO_FLAG_VALID; + adm5120_gpio_map[ADM5120_GPIO_PIN7].flags &= ~GPIO_FLAG_VALID; + } +} |