diff options
Diffstat (limited to 'arch/arm/mach-msm/board-trout-gpio.c')
| -rw-r--r-- | arch/arm/mach-msm/board-trout-gpio.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/board-trout-gpio.c b/arch/arm/mach-msm/board-trout-gpio.c new file mode 100644 index 000000000000..c50f3afc3134 --- /dev/null +++ b/arch/arm/mach-msm/board-trout-gpio.c @@ -0,0 +1,227 @@ +/* + * linux/arch/arm/mach-msm/gpio.c + * + * Copyright (C) 2005 HP Labs + * Copyright (C) 2008 Google, Inc. + * Copyright (C) 2009 Pavel Machek <pavel@ucw.cz> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/interrupt.h> +#include <linux/gpio.h> + +#include "board-trout.h" + +static uint8_t trout_int_mask[2] = { + [0] = 0xff, /* mask all interrupts */ + [1] = 0xff, +}; +static uint8_t trout_sleep_int_mask[] = { + [0] = 0xff, + [1] = 0xff, +}; + +struct msm_gpio_chip { + struct gpio_chip chip; + void __iomem *reg; /* Base of register bank */ + u8 shadow; +}; + +#define to_msm_gpio_chip(c) container_of(c, struct msm_gpio_chip, chip) + +static int msm_gpiolib_get(struct gpio_chip *chip, unsigned offset) +{ + struct msm_gpio_chip *msm_gpio = to_msm_gpio_chip(chip); + unsigned mask = 1 << offset; + + return !!(readb(msm_gpio->reg) & mask); +} + +static void msm_gpiolib_set(struct gpio_chip *chip, unsigned offset, int val) +{ + struct msm_gpio_chip *msm_gpio = to_msm_gpio_chip(chip); + unsigned mask = 1 << offset; + + if (val) + msm_gpio->shadow |= mask; + else + msm_gpio->shadow &= ~mask; + + writeb(msm_gpio->shadow, msm_gpio->reg); +} + +static int msm_gpiolib_direction_input(struct gpio_chip *chip, + unsigned offset) +{ + msm_gpiolib_set(chip, offset, 0); + return 0; +} + +static int msm_gpiolib_direction_output(struct gpio_chip *chip, + unsigned offset, int val) +{ + msm_gpiolib_set(chip, offset, val); + return 0; +} + +#define TROUT_GPIO_BANK(name, reg_num, base_gpio, shadow_val) \ + { \ + .chip = { \ + .label = name, \ + .direction_input = msm_gpiolib_direction_input,\ + .direction_output = msm_gpiolib_direction_output, \ + .get = msm_gpiolib_get, \ + .set = msm_gpiolib_set, \ + .base = base_gpio, \ + .ngpio = 8, \ + }, \ + .reg = (void *) reg_num + TROUT_CPLD_BASE, \ + .shadow = shadow_val, \ + } + +static struct msm_gpio_chip msm_gpio_banks[] = { +#if defined(CONFIG_MSM_DEBUG_UART1) + /* H2W pins <-> UART1 */ + TROUT_GPIO_BANK("MISC2", 0x00, TROUT_GPIO_MISC2_BASE, 0x40), +#else + /* H2W pins <-> UART3, Bluetooth <-> UART1 */ + TROUT_GPIO_BANK("MISC2", 0x00, TROUT_GPIO_MISC2_BASE, 0x80), +#endif + /* I2C pull */ + TROUT_GPIO_BANK("MISC3", 0x02, TROUT_GPIO_MISC3_BASE, 0x04), + TROUT_GPIO_BANK("MISC4", 0x04, TROUT_GPIO_MISC4_BASE, 0), + /* mmdi 32k en */ + TROUT_GPIO_BANK("MISC5", 0x06, TROUT_GPIO_MISC5_BASE, 0x04), + TROUT_GPIO_BANK("INT2", 0x08, TROUT_GPIO_INT2_BASE, 0), + TROUT_GPIO_BANK("MISC1", 0x0a, TROUT_GPIO_MISC1_BASE, 0), + TROUT_GPIO_BANK("VIRTUAL", 0x12, TROUT_GPIO_VIRTUAL_BASE, 0), +}; + +static void trout_gpio_irq_ack(unsigned int irq) +{ + int bank = TROUT_INT_TO_BANK(irq); + uint8_t mask = TROUT_INT_TO_MASK(irq); + int reg = TROUT_BANK_TO_STAT_REG(bank); + /*printk(KERN_INFO "trout_gpio_irq_ack irq %d\n", irq);*/ + writeb(mask, TROUT_CPLD_BASE + reg); +} + +static void trout_gpio_irq_mask(unsigned int irq) +{ + unsigned long flags; + uint8_t reg_val; + int bank = TROUT_INT_TO_BANK(irq); + uint8_t mask = TROUT_INT_TO_MASK(irq); + int reg = TROUT_BANK_TO_MASK_REG(bank); + + local_irq_save(flags); + reg_val = trout_int_mask[bank] |= mask; + /*printk(KERN_INFO "trout_gpio_irq_mask irq %d => %d:%02x\n", + irq, bank, reg_val);*/ + writeb(reg_val, TROUT_CPLD_BASE + reg); + local_irq_restore(flags); +} + +static void trout_gpio_irq_unmask(unsigned int irq) +{ + unsigned long flags; + uint8_t reg_val; + int bank = TROUT_INT_TO_BANK(irq); + uint8_t mask = TROUT_INT_TO_MASK(irq); + int reg = TROUT_BANK_TO_MASK_REG(bank); + + local_irq_save(flags); + reg_val = trout_int_mask[bank] &= ~mask; + /*printk(KERN_INFO "trout_gpio_irq_unmask irq %d => %d:%02x\n", + irq, bank, reg_val);*/ + writeb(reg_val, TROUT_CPLD_BASE + reg); + local_irq_restore(flags); +} + +int trout_gpio_irq_set_wake(unsigned int irq, unsigned int on) +{ + unsigned long flags; + int bank = TROUT_INT_TO_BANK(irq); + uint8_t mask = TROUT_INT_TO_MASK(irq); + + local_irq_save(flags); + if(on) + trout_sleep_int_mask[bank] &= ~mask; + else + trout_sleep_int_mask[bank] |= mask; + local_irq_restore(flags); + return 0; +} + +static void trout_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + int j, m; + unsigned v; + int bank; + int stat_reg; + int int_base = TROUT_INT_START; + uint8_t int_mask; + + for (bank = 0; bank < 2; bank++) { + stat_reg = TROUT_BANK_TO_STAT_REG(bank); + v = readb(TROUT_CPLD_BASE + stat_reg); + int_mask = trout_int_mask[bank]; + if (v & int_mask) { + writeb(v & int_mask, TROUT_CPLD_BASE + stat_reg); + printk(KERN_ERR "trout_gpio_irq_handler: got masked " + "interrupt: %d:%02x\n", bank, v & int_mask); + } + v &= ~int_mask; + while (v) { + m = v & -v; + j = fls(m) - 1; + /*printk(KERN_INFO "msm_gpio_irq_handler %d:%02x %02x b" + "it %d irq %d\n", bank, v, m, j, int_base + j);*/ + v &= ~m; + generic_handle_irq(int_base + j); + } + int_base += TROUT_INT_BANK0_COUNT; + } + desc->chip->ack(irq); +} + +static struct irq_chip trout_gpio_irq_chip = { + .name = "troutgpio", + .ack = trout_gpio_irq_ack, + .mask = trout_gpio_irq_mask, + .unmask = trout_gpio_irq_unmask, + .set_wake = trout_gpio_irq_set_wake, +}; + +/* + * Called from the processor-specific init to enable GPIO pin support. + */ +int __init trout_init_gpio(void) +{ + int i; + for(i = TROUT_INT_START; i <= TROUT_INT_END; i++) { + set_irq_chip(i, &trout_gpio_irq_chip); + set_irq_handler(i, handle_edge_irq); + set_irq_flags(i, IRQF_VALID); + } + + for (i = 0; i < ARRAY_SIZE(msm_gpio_banks); i++) + gpiochip_add(&msm_gpio_banks[i].chip); + + set_irq_type(MSM_GPIO_TO_INT(17), IRQF_TRIGGER_HIGH); + set_irq_chained_handler(MSM_GPIO_TO_INT(17), trout_gpio_irq_handler); + set_irq_wake(MSM_GPIO_TO_INT(17), 1); + + return 0; +} + +postcore_initcall(trout_init_gpio); + |