| /* |
| * 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; |
| } |
| |
| static int trout_gpio_to_irq(struct gpio_chip *chip, unsigned offset) |
| { |
| return TROUT_GPIO_TO_INT(offset + chip->base); |
| } |
| |
| #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, \ |
| .to_irq = trout_gpio_to_irq, \ |
| .base = base_gpio, \ |
| .ngpio = 8, \ |
| }, \ |
| .reg = 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(struct irq_data *d) |
| { |
| int bank = TROUT_INT_TO_BANK(d->irq); |
| uint8_t mask = TROUT_INT_TO_MASK(d->irq); |
| int reg = TROUT_BANK_TO_STAT_REG(bank); |
| /*printk(KERN_INFO "trout_gpio_irq_ack irq %d\n", d->irq);*/ |
| writeb(mask, TROUT_CPLD_BASE + reg); |
| } |
| |
| static void trout_gpio_irq_mask(struct irq_data *d) |
| { |
| unsigned long flags; |
| uint8_t reg_val; |
| int bank = TROUT_INT_TO_BANK(d->irq); |
| uint8_t mask = TROUT_INT_TO_MASK(d->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", |
| d->irq, bank, reg_val);*/ |
| writeb(reg_val, TROUT_CPLD_BASE + reg); |
| local_irq_restore(flags); |
| } |
| |
| static void trout_gpio_irq_unmask(struct irq_data *d) |
| { |
| unsigned long flags; |
| uint8_t reg_val; |
| int bank = TROUT_INT_TO_BANK(d->irq); |
| uint8_t mask = TROUT_INT_TO_MASK(d->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", |
| d->irq, bank, reg_val);*/ |
| writeb(reg_val, TROUT_CPLD_BASE + reg); |
| local_irq_restore(flags); |
| } |
| |
| int trout_gpio_irq_set_wake(struct irq_data *d, unsigned int on) |
| { |
| unsigned long flags; |
| int bank = TROUT_INT_TO_BANK(d->irq); |
| uint8_t mask = TROUT_INT_TO_MASK(d->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->irq_data.chip->irq_ack(&desc->irq_data); |
| } |
| |
| static struct irq_chip trout_gpio_irq_chip = { |
| .name = "troutgpio", |
| .irq_ack = trout_gpio_irq_ack, |
| .irq_mask = trout_gpio_irq_mask, |
| .irq_unmask = trout_gpio_irq_unmask, |
| .irq_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++) { |
| irq_set_chip_and_handler(i, &trout_gpio_irq_chip, |
| 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); |
| |
| irq_set_irq_type(MSM_GPIO_TO_INT(17), IRQF_TRIGGER_HIGH); |
| irq_set_chained_handler(MSM_GPIO_TO_INT(17), trout_gpio_irq_handler); |
| irq_set_irq_wake(MSM_GPIO_TO_INT(17), 1); |
| |
| return 0; |
| } |
| |
| postcore_initcall(trout_init_gpio); |
| |