diff options
Diffstat (limited to 'arch/arm/mach-msm/board-sapphire-gpio.c')
| -rw-r--r-- | arch/arm/mach-msm/board-sapphire-gpio.c | 326 |
1 files changed, 326 insertions, 0 deletions
diff --git a/arch/arm/mach-msm/board-sapphire-gpio.c b/arch/arm/mach-msm/board-sapphire-gpio.c new file mode 100644 index 000000000000..2f2df97956cf --- /dev/null +++ b/arch/arm/mach-msm/board-sapphire-gpio.c @@ -0,0 +1,326 @@ +/* arch/arm/mach-msm/board-sapphire-gpio.c + * Copyright (C) 2007-2009 HTC Corporation. + * Author: Thomas Tsai <thomas_tsai@htc.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. +*/ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/irq.h> +#include <linux/pm.h> +#include <linux/sysdev.h> + +#include <linux/io.h> +#include <linux/gpio.h> +#include <asm/mach-types.h> + +#include "gpio_chip.h" +#include "board-sapphire.h" + +#ifdef DEBUG_SAPPHIRE_GPIO +#define DBG(fmt, arg...) printk(KERN_INFO "%s: " fmt "\n", __func__, ## arg) +#else +#define DBG(fmt, arg...) do {} while (0) +#endif + +#define SAPPHIRE_CPLD_INT_STATUS (SAPPHIRE_CPLD_BASE + 0x0E) +#define SAPPHIRE_CPLD_INT_LEVEL (SAPPHIRE_CPLD_BASE + 0x08) +#define SAPPHIRE_CPLD_INT_MASK (SAPPHIRE_CPLD_BASE + 0x0C) + +/*CPLD misc reg offset*/ +static const int _g_CPLD_MISCn_Offset[] = { 0x0A, /*misc1 reg*/ + 0x00, /*misc2 reg*/ + 0x02, /*misc3 reg*/ + 0x04, /*misc4 reg*/ + 0x06}; /*misc5 reg*/ +/*CPLD INT Bank*/ +/*BANK0: int1 status, int2 level, int3 mask*/ +static const int _g_INT_BANK_Offset[][3] = {{0x0E, 0x08, 0x0C} }; + +static uint8_t sapphire_cpld_initdata[4] = { + [0] = 0x80, /* for serial debug UART3, low current misc2*/ + [1] = 0x34, /* jog & tp enable, I2C pull misc3*/ + [3] = 0x04, /* mmdi 32k en misc5*/ +}; + +/*save current working int mask, so the value can be restored after resume. +Sapphire has only bank0.*/ +static uint8_t sapphire_int_mask[] = { + [0] = 0xfb, /* enable all interrupts, bit 2 is not used */ +}; + +/*Sleep have to prepare the wake up source in advance. +default to disable all wakeup sources when suspend.*/ +static uint8_t sapphire_sleep_int_mask[] = { + [0] = 0x00, /* bit2 is not used */ +}; + +static int sapphire_suspended; + +static int sapphire_gpio_read(struct gpio_chip *chip, unsigned n) +{ + if (n < SAPPHIRE_GPIO_INT_B0_BASE) /*MISCn*/ + return !!(readb(CPLD_GPIO_REG(n)) & CPLD_GPIO_BIT_POS_MASK(n)); + else if (n <= SAPPHIRE_GPIO_END) /*gpio n is INT pin*/ + return !!(readb(CPLD_INT_LEVEL_REG_G(n)) & + CPLD_GPIO_BIT_POS_MASK(n)); + return 0; +} + +/*CPLD Write only register :MISC2, MISC3, MISC4, MISC5 => reg=0,2,4,6 +Reading from write-only registers is undefined, so the writing value +should be kept in shadow for later usage.*/ +int sapphire_gpio_write(struct gpio_chip *chip, unsigned n, unsigned on) +{ + unsigned long flags; + uint8_t reg_val; + if (n > SAPPHIRE_GPIO_END) + return -1; + + local_irq_save(flags); + reg_val = readb(CPLD_GPIO_REG(n)); + if (on) + reg_val |= CPLD_GPIO_BIT_POS_MASK(n); + else + reg_val &= ~CPLD_GPIO_BIT_POS_MASK(n); + writeb(reg_val, CPLD_GPIO_REG(n)); + + DBG("gpio=%d, l=0x%x\r\n", n, readb(SAPPHIRE_CPLD_INT_LEVEL)); + + local_irq_restore(flags); + + return 0; +} + +static int sapphire_gpio_configure(struct gpio_chip *chip, unsigned int gpio, + unsigned long flags) +{ + if (flags & (GPIOF_OUTPUT_LOW | GPIOF_OUTPUT_HIGH)) + sapphire_gpio_write(chip, gpio, flags & GPIOF_OUTPUT_HIGH); + + DBG("gpio=%d, l=0x%x\r\n", gpio, readb(SAPPHIRE_CPLD_INT_LEVEL)); + + return 0; +} + +static int sapphire_gpio_get_irq_num(struct gpio_chip *chip, unsigned int gpio, + unsigned int *irqp, unsigned long *irqnumflagsp) +{ + DBG("gpio=%d, l=0x%x\r\n", gpio, readb(SAPPHIRE_CPLD_INT_LEVEL)); + DBG("SAPPHIRE_GPIO_INT_B0_BASE=%d, SAPPHIRE_GPIO_LAST_INT=%d\r\n", + SAPPHIRE_GPIO_INT_B0_BASE, SAPPHIRE_GPIO_LAST_INT); + if ((gpio < SAPPHIRE_GPIO_INT_B0_BASE) || + (gpio > SAPPHIRE_GPIO_LAST_INT)) + return -ENOENT; + *irqp = SAPPHIRE_GPIO_TO_INT(gpio); + DBG("*irqp=%d\r\n", *irqp); + if (irqnumflagsp) + *irqnumflagsp = 0; + return 0; +} + +/*write 1 to clear INT status bit.*/ +static void sapphire_gpio_irq_ack(unsigned int irq) +{ + /*write 1 to clear*/ + writeb(SAPPHIRE_INT_BIT_MASK(irq), CPLD_INT_STATUS_REG(irq)); +} + +/*unmask/enable the INT +static void sapphire_gpio_irq_unmask(unsigned int irq)*/ +static void sapphire_gpio_irq_enable(unsigned int irq) +{ + unsigned long flags; + uint8_t reg_val; + + local_irq_save(flags); /*disabling all interrupts*/ + + reg_val = readb(CPLD_INT_MASK_REG(irq)) | SAPPHIRE_INT_BIT_MASK(irq); + DBG("(irq=%d,0x%x, 0x%x)\r\n", irq, CPLD_INT_MASK_REG(irq), + SAPPHIRE_INT_BIT_MASK(irq)); + DBG("sapphire_suspended=%d\r\n", sapphire_suspended); + /*printk(KERN_INFO "sapphire_gpio_irq_mask irq %d => %d:%02x\n", + irq, bank, reg_val);*/ + if (!sapphire_suspended) + writeb(reg_val, CPLD_INT_MASK_REG(irq)); + + reg_val = readb(CPLD_INT_MASK_REG(irq)); + DBG("reg_val= 0x%x\r\n", reg_val); + DBG("l=0x%x\r\n", readb(SAPPHIRE_CPLD_INT_LEVEL)); + + local_irq_restore(flags); /*restore the interrupts*/ +} + +/*mask/disable INT +static void sapphire_gpio_irq_mask(unsigned int irq)*/ +static void sapphire_gpio_irq_disable(unsigned int irq) +{ + unsigned long flags; + uint8_t reg_val; + + local_irq_save(flags); + reg_val = readb(CPLD_INT_MASK_REG(irq)) & ~SAPPHIRE_INT_BIT_MASK(irq); + /*CPLD INT MASK is r/w now.*/ + + /*printk(KERN_INFO "sapphire_gpio_irq_unmask irq %d => %d:%02x\n", + irq, bank, reg_val);*/ + DBG("(%d,0x%x, 0x%x, 0x%x)\r\n", irq, reg_val, CPLD_INT_MASK_REG(irq), + SAPPHIRE_INT_BIT_MASK(irq)); + DBG("sapphire_suspended=%d\r\n", sapphire_suspended); + if (!sapphire_suspended) + writeb(reg_val, CPLD_INT_MASK_REG(irq)); + + reg_val = readb(CPLD_INT_MASK_REG(irq)); + DBG("reg_val= 0x%x\r\n", reg_val); + DBG("l=0x%x\r\n", readb(SAPPHIRE_CPLD_INT_LEVEL)); + + local_irq_restore(flags); +} + +/*preparing enable/disable wake source before sleep*/ +int sapphire_gpio_irq_set_wake(unsigned int irq, unsigned int on) +{ + unsigned long flags; + uint8_t mask = SAPPHIRE_INT_BIT_MASK(irq); + + local_irq_save(flags); + + if (on) /*wake on -> mask the bit*/ + sapphire_sleep_int_mask[CPLD_INT_TO_BANK(irq)] |= mask; + else /*no wake -> unmask the bit*/ + sapphire_sleep_int_mask[CPLD_INT_TO_BANK(irq)] &= ~mask; + local_irq_restore(flags); + return 0; +} + +/*Sapphire has only one INT Bank.*/ +static void sapphire_gpio_irq_handler(unsigned int irq, struct irq_desc *desc) +{ + int j; + unsigned v; + int int_base = SAPPHIRE_INT_START; + + v = readb(SAPPHIRE_CPLD_INT_STATUS); /*INT1 status reg, BANK0*/ + + for (j = 0; j < 8 ; j++) { /*8 bit per bank*/ + if (v & (1U << j)) { /*got the INT Bit*/ + DBG("generic_handle_irq j=0x%x\r\n", j); + generic_handle_irq(int_base + j); + } + } + + desc->chip->ack(irq); /*clear CPLD INT in SOC side.*/ + DBG("irq=%d, l=0x%x\r\n", irq, readb(SAPPHIRE_CPLD_INT_LEVEL)); +} + +/*Save current working sources before sleep, so we can restore it after + * resume.*/ +static int sapphire_sysdev_suspend(struct sys_device *dev, pm_message_t state) +{ + sapphire_suspended = 1; + /*save current masking*/ + sapphire_int_mask[0] = readb(SAPPHIRE_CPLD_BASE + + SAPPHIRE_GPIO_INT_B0_MASK_REG); + + /*set waking source before sleep.*/ + writeb(sapphire_sleep_int_mask[0], + SAPPHIRE_CPLD_BASE + SAPPHIRE_GPIO_INT_B0_MASK_REG); + + return 0; +} + +/*All the registers will be kept till a power loss...*/ +int sapphire_sysdev_resume(struct sys_device *dev) +{ + /*restore the working mask saved before sleep*/ + writeb(sapphire_int_mask[0], SAPPHIRE_CPLD_BASE + + SAPPHIRE_GPIO_INT_B0_MASK_REG); + sapphire_suspended = 0; + return 0; +} + +/** + * linux/irq.h :: struct irq_chip + * @enable: enable the interrupt (defaults to chip->unmask if NULL) + * @disable: disable the interrupt (defaults to chip->mask if NULL) + * @ack: start of a new interrupt + * @mask: mask an interrupt source + * @mask_ack: ack and mask an interrupt source + * @unmask: unmask an interrupt source + */ +static struct irq_chip sapphire_gpio_irq_chip = { + .name = "sapphiregpio", + .ack = sapphire_gpio_irq_ack, + .mask = sapphire_gpio_irq_disable, /*sapphire_gpio_irq_mask,*/ + .unmask = sapphire_gpio_irq_enable, /*sapphire_gpio_irq_unmask,*/ + .set_wake = sapphire_gpio_irq_set_wake, + /*.set_type = sapphire_gpio_irq_set_type,*/ +}; + +/*Thomas:For CPLD*/ +static struct gpio_chip sapphire_gpio_chip = { + .start = SAPPHIRE_GPIO_START, + .end = SAPPHIRE_GPIO_END, + .configure = sapphire_gpio_configure, + .get_irq_num = sapphire_gpio_get_irq_num, + .read = sapphire_gpio_read, + .write = sapphire_gpio_write, +/* .read_detect_status = sapphire_gpio_read_detect_status, + .clear_detect_status = sapphire_gpio_clear_detect_status */ +}; + +struct sysdev_class sapphire_sysdev_class = { + .name = "sapphiregpio_irq", + .suspend = sapphire_sysdev_suspend, + .resume = sapphire_sysdev_resume, +}; + +static struct sys_device sapphire_irq_device = { + .cls = &sapphire_sysdev_class, +}; + +int sapphire_init_gpio(void) +{ + int i; + if (!machine_is_sapphire()) + return 0; + + DBG("%d,%d\r\n", SAPPHIRE_INT_START, SAPPHIRE_INT_END); + DBG("NR_MSM_IRQS=%d, NR_GPIO_IRQS=%d\r\n", NR_MSM_IRQS, NR_GPIO_IRQS); + for (i = SAPPHIRE_INT_START; i <= SAPPHIRE_INT_END; i++) { + set_irq_chip(i, &sapphire_gpio_irq_chip); + set_irq_handler(i, handle_edge_irq); + set_irq_flags(i, IRQF_VALID); + } + + register_gpio_chip(&sapphire_gpio_chip); + + /*setup CPLD INT connecting to SOC's gpio 17 */ + set_irq_type(MSM_GPIO_TO_INT(17), IRQF_TRIGGER_HIGH); + set_irq_chained_handler(MSM_GPIO_TO_INT(17), sapphire_gpio_irq_handler); + set_irq_wake(MSM_GPIO_TO_INT(17), 1); + + if (sysdev_class_register(&sapphire_sysdev_class) == 0) + sysdev_register(&sapphire_irq_device); + + return 0; +} + +int sapphire_init_cpld(unsigned int sys_rev) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(sapphire_cpld_initdata); i++) + writeb(sapphire_cpld_initdata[i], SAPPHIRE_CPLD_BASE + i * 2); + return 0; +} + +arch_initcall(sapphire_init_gpio); |