521 lines
13 KiB
C
521 lines
13 KiB
C
/*
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* Copyright (C) ST-Ericsson SA 2011
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*
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* Author: BIBEK BASU <bibek.basu@stericsson.com>
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* License terms: GNU General Public License (GPL) version 2
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/mfd/ab8500.h>
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#include <linux/mfd/abx500.h>
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#include <linux/mfd/ab8500/gpio.h>
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/*
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* GPIO registers offset
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* Bank: 0x10
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*/
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#define AB8500_GPIO_SEL1_REG 0x00
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#define AB8500_GPIO_SEL2_REG 0x01
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#define AB8500_GPIO_SEL3_REG 0x02
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#define AB8500_GPIO_SEL4_REG 0x03
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#define AB8500_GPIO_SEL5_REG 0x04
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#define AB8500_GPIO_SEL6_REG 0x05
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#define AB8500_GPIO_DIR1_REG 0x10
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#define AB8500_GPIO_DIR2_REG 0x11
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#define AB8500_GPIO_DIR3_REG 0x12
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#define AB8500_GPIO_DIR4_REG 0x13
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#define AB8500_GPIO_DIR5_REG 0x14
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#define AB8500_GPIO_DIR6_REG 0x15
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#define AB8500_GPIO_OUT1_REG 0x20
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#define AB8500_GPIO_OUT2_REG 0x21
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#define AB8500_GPIO_OUT3_REG 0x22
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#define AB8500_GPIO_OUT4_REG 0x23
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#define AB8500_GPIO_OUT5_REG 0x24
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#define AB8500_GPIO_OUT6_REG 0x25
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#define AB8500_GPIO_PUD1_REG 0x30
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#define AB8500_GPIO_PUD2_REG 0x31
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#define AB8500_GPIO_PUD3_REG 0x32
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#define AB8500_GPIO_PUD4_REG 0x33
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#define AB8500_GPIO_PUD5_REG 0x34
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#define AB8500_GPIO_PUD6_REG 0x35
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#define AB8500_GPIO_IN1_REG 0x40
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#define AB8500_GPIO_IN2_REG 0x41
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#define AB8500_GPIO_IN3_REG 0x42
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#define AB8500_GPIO_IN4_REG 0x43
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#define AB8500_GPIO_IN5_REG 0x44
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#define AB8500_GPIO_IN6_REG 0x45
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#define AB8500_GPIO_ALTFUN_REG 0x45
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#define ALTFUN_REG_INDEX 6
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#define AB8500_NUM_GPIO 42
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#define AB8500_NUM_VIR_GPIO_IRQ 16
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enum ab8500_gpio_action {
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NONE,
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STARTUP,
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SHUTDOWN,
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MASK,
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UNMASK
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};
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struct ab8500_gpio {
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struct gpio_chip chip;
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struct ab8500 *parent;
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struct device *dev;
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struct mutex lock;
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u32 irq_base;
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enum ab8500_gpio_action irq_action;
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u16 rising;
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u16 falling;
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};
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/**
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* to_ab8500_gpio() - get the pointer to ab8500_gpio
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* @chip: Member of the structure ab8500_gpio
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*/
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static inline struct ab8500_gpio *to_ab8500_gpio(struct gpio_chip *chip)
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{
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return container_of(chip, struct ab8500_gpio, chip);
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}
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static int ab8500_gpio_set_bits(struct gpio_chip *chip, u8 reg,
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unsigned offset, int val)
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{
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struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
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u8 pos = offset % 8;
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int ret;
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reg = reg + (offset / 8);
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ret = abx500_mask_and_set_register_interruptible(ab8500_gpio->dev,
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AB8500_MISC, reg, 1 << pos, val << pos);
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if (ret < 0)
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dev_err(ab8500_gpio->dev, "%s write failed\n", __func__);
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return ret;
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}
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/**
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* ab8500_gpio_get() - Get the particular GPIO value
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* @chip: Gpio device
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* @offset: GPIO number to read
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*/
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static int ab8500_gpio_get(struct gpio_chip *chip, unsigned offset)
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{
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struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
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u8 mask = 1 << (offset % 8);
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u8 reg = AB8500_GPIO_OUT1_REG + (offset / 8);
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int ret;
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u8 data;
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ret = abx500_get_register_interruptible(ab8500_gpio->dev, AB8500_MISC,
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reg, &data);
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if (ret < 0) {
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dev_err(ab8500_gpio->dev, "%s read failed\n", __func__);
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return ret;
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}
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return (data & mask) >> (offset % 8);
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}
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static void ab8500_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
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{
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struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
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int ret;
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/* Write the data */
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ret = ab8500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, 1);
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if (ret < 0)
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dev_err(ab8500_gpio->dev, "%s write failed\n", __func__);
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}
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static int ab8500_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
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int val)
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{
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int ret;
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/* set direction as output */
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ret = ab8500_gpio_set_bits(chip, AB8500_GPIO_DIR1_REG, offset, 1);
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if (ret < 0)
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return ret;
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/* disable pull down */
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ret = ab8500_gpio_set_bits(chip, AB8500_GPIO_PUD1_REG, offset, 1);
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if (ret < 0)
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return ret;
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/* set the output as 1 or 0 */
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return ab8500_gpio_set_bits(chip, AB8500_GPIO_OUT1_REG, offset, val);
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}
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static int ab8500_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
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{
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/* set the register as input */
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return ab8500_gpio_set_bits(chip, AB8500_GPIO_DIR1_REG, offset, 0);
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}
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static int ab8500_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
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{
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/*
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* Only some GPIOs are interrupt capable, and they are
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* organized in discontiguous clusters:
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*
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* GPIO6 to GPIO13
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* GPIO24 and GPIO25
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* GPIO36 to GPIO41
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*/
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static struct ab8500_gpio_irq_cluster {
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int start;
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int end;
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} clusters[] = {
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{.start = 6, .end = 13},
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{.start = 24, .end = 25},
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{.start = 36, .end = 41},
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};
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struct ab8500_gpio *ab8500_gpio = to_ab8500_gpio(chip);
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int base = ab8500_gpio->irq_base;
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int i;
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for (i = 0; i < ARRAY_SIZE(clusters); i++) {
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struct ab8500_gpio_irq_cluster *cluster = &clusters[i];
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if (offset >= cluster->start && offset <= cluster->end)
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return base + offset - cluster->start;
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/* Advance by the number of gpios in this cluster */
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base += cluster->end - cluster->start + 1;
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}
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return -EINVAL;
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}
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static struct gpio_chip ab8500gpio_chip = {
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.label = "ab8500_gpio",
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.owner = THIS_MODULE,
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.direction_input = ab8500_gpio_direction_input,
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.get = ab8500_gpio_get,
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.direction_output = ab8500_gpio_direction_output,
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.set = ab8500_gpio_set,
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.to_irq = ab8500_gpio_to_irq,
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};
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static unsigned int irq_to_rising(unsigned int irq)
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{
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struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
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int offset = irq - ab8500_gpio->irq_base;
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int new_irq = offset + AB8500_INT_GPIO6R
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+ ab8500_gpio->parent->irq_base;
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return new_irq;
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}
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static unsigned int irq_to_falling(unsigned int irq)
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{
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struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
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int offset = irq - ab8500_gpio->irq_base;
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int new_irq = offset + AB8500_INT_GPIO6F
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+ ab8500_gpio->parent->irq_base;
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return new_irq;
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}
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static unsigned int rising_to_irq(unsigned int irq, void *dev)
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{
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struct ab8500_gpio *ab8500_gpio = dev;
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int offset = irq - AB8500_INT_GPIO6R
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- ab8500_gpio->parent->irq_base ;
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int new_irq = offset + ab8500_gpio->irq_base;
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return new_irq;
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}
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static unsigned int falling_to_irq(unsigned int irq, void *dev)
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{
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struct ab8500_gpio *ab8500_gpio = dev;
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int offset = irq - AB8500_INT_GPIO6F
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- ab8500_gpio->parent->irq_base ;
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int new_irq = offset + ab8500_gpio->irq_base;
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return new_irq;
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}
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/*
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* IRQ handler
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*/
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static irqreturn_t handle_rising(int irq, void *dev)
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{
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handle_nested_irq(rising_to_irq(irq , dev));
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return IRQ_HANDLED;
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}
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static irqreturn_t handle_falling(int irq, void *dev)
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{
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handle_nested_irq(falling_to_irq(irq, dev));
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return IRQ_HANDLED;
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}
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static void ab8500_gpio_irq_lock(unsigned int irq)
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{
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struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
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mutex_lock(&ab8500_gpio->lock);
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}
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static void ab8500_gpio_irq_sync_unlock(unsigned int irq)
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{
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struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
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int offset = irq - ab8500_gpio->irq_base;
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bool rising = ab8500_gpio->rising & BIT(offset);
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bool falling = ab8500_gpio->falling & BIT(offset);
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int ret;
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switch (ab8500_gpio->irq_action) {
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case STARTUP:
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if (rising)
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ret = request_threaded_irq(irq_to_rising(irq),
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NULL, handle_rising,
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IRQF_TRIGGER_RISING,
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"ab8500-gpio-r", ab8500_gpio);
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if (falling)
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ret = request_threaded_irq(irq_to_falling(irq),
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NULL, handle_falling,
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IRQF_TRIGGER_FALLING,
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"ab8500-gpio-f", ab8500_gpio);
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break;
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case SHUTDOWN:
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if (rising)
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free_irq(irq_to_rising(irq), ab8500_gpio);
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if (falling)
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free_irq(irq_to_falling(irq), ab8500_gpio);
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break;
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case MASK:
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if (rising)
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disable_irq(irq_to_rising(irq));
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if (falling)
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disable_irq(irq_to_falling(irq));
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break;
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case UNMASK:
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if (rising)
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enable_irq(irq_to_rising(irq));
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if (falling)
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enable_irq(irq_to_falling(irq));
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break;
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case NONE:
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break;
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}
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ab8500_gpio->irq_action = NONE;
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ab8500_gpio->rising &= ~(BIT(offset));
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ab8500_gpio->falling &= ~(BIT(offset));
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mutex_unlock(&ab8500_gpio->lock);
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}
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static void ab8500_gpio_irq_mask(unsigned int irq)
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{
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struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
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ab8500_gpio->irq_action = MASK;
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}
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static void ab8500_gpio_irq_unmask(unsigned int irq)
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{
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struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
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ab8500_gpio->irq_action = UNMASK;
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}
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static int ab8500_gpio_irq_set_type(unsigned int irq, unsigned int type)
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{
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struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
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int offset = irq - ab8500_gpio->irq_base;
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if (type == IRQ_TYPE_EDGE_BOTH) {
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ab8500_gpio->rising = BIT(offset);
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ab8500_gpio->falling = BIT(offset);
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} else if (type == IRQ_TYPE_EDGE_RISING) {
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ab8500_gpio->rising = BIT(offset);
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} else {
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ab8500_gpio->falling = BIT(offset);
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}
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return 0;
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}
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unsigned int ab8500_gpio_irq_startup(unsigned int irq)
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{
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struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
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ab8500_gpio->irq_action = STARTUP;
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return 0;
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}
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void ab8500_gpio_irq_shutdown(unsigned int irq)
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{
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struct ab8500_gpio *ab8500_gpio = get_irq_chip_data(irq);
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ab8500_gpio->irq_action = SHUTDOWN;
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}
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static struct irq_chip ab8500_gpio_irq_chip = {
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.name = "ab8500-gpio",
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.startup = ab8500_gpio_irq_startup,
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.shutdown = ab8500_gpio_irq_shutdown,
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.bus_lock = ab8500_gpio_irq_lock,
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.bus_sync_unlock = ab8500_gpio_irq_sync_unlock,
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.mask = ab8500_gpio_irq_mask,
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.unmask = ab8500_gpio_irq_unmask,
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.set_type = ab8500_gpio_irq_set_type,
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};
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static int ab8500_gpio_irq_init(struct ab8500_gpio *ab8500_gpio)
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{
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u32 base = ab8500_gpio->irq_base;
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int irq;
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for (irq = base; irq < base + AB8500_NUM_VIR_GPIO_IRQ ; irq++) {
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set_irq_chip_data(irq, ab8500_gpio);
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set_irq_chip_and_handler(irq, &ab8500_gpio_irq_chip,
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handle_simple_irq);
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set_irq_nested_thread(irq, 1);
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#ifdef CONFIG_ARM
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set_irq_flags(irq, IRQF_VALID);
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#else
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set_irq_noprobe(irq);
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#endif
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}
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return 0;
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}
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static void ab8500_gpio_irq_remove(struct ab8500_gpio *ab8500_gpio)
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{
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int base = ab8500_gpio->irq_base;
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int irq;
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for (irq = base; irq < base + AB8500_NUM_VIR_GPIO_IRQ; irq++) {
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#ifdef CONFIG_ARM
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set_irq_flags(irq, 0);
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#endif
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set_irq_chip_and_handler(irq, NULL, NULL);
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set_irq_chip_data(irq, NULL);
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}
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}
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static int __devinit ab8500_gpio_probe(struct platform_device *pdev)
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{
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struct ab8500_platform_data *ab8500_pdata =
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dev_get_platdata(pdev->dev.parent);
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struct ab8500_gpio_platform_data *pdata;
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struct ab8500_gpio *ab8500_gpio;
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int ret;
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int i;
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pdata = ab8500_pdata->gpio;
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if (!pdata) {
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dev_err(&pdev->dev, "gpio platform data missing\n");
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return -ENODEV;
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}
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ab8500_gpio = kzalloc(sizeof(struct ab8500_gpio), GFP_KERNEL);
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if (ab8500_gpio == NULL) {
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dev_err(&pdev->dev, "failed to allocate memory\n");
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return -ENOMEM;
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}
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ab8500_gpio->dev = &pdev->dev;
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ab8500_gpio->parent = dev_get_drvdata(pdev->dev.parent);
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ab8500_gpio->chip = ab8500gpio_chip;
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ab8500_gpio->chip.ngpio = AB8500_NUM_GPIO;
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ab8500_gpio->chip.dev = &pdev->dev;
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ab8500_gpio->chip.base = pdata->gpio_base;
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ab8500_gpio->irq_base = pdata->irq_base;
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/* initialize the lock */
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mutex_init(&ab8500_gpio->lock);
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/*
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* AB8500 core will handle and clear the IRQ
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* configre GPIO based on config-reg value.
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* These values are for selecting the PINs as
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* GPIO or alternate function
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*/
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for (i = AB8500_GPIO_SEL1_REG; i <= AB8500_GPIO_SEL6_REG; i++) {
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ret = abx500_set_register_interruptible(ab8500_gpio->dev,
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AB8500_MISC, i,
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pdata->config_reg[i]);
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if (ret < 0)
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goto out_free;
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}
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ret = abx500_set_register_interruptible(ab8500_gpio->dev, AB8500_MISC,
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AB8500_GPIO_ALTFUN_REG,
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pdata->config_reg[ALTFUN_REG_INDEX]);
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if (ret < 0)
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goto out_free;
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ret = ab8500_gpio_irq_init(ab8500_gpio);
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if (ret)
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goto out_free;
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ret = gpiochip_add(&ab8500_gpio->chip);
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if (ret) {
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dev_err(&pdev->dev, "unable to add gpiochip: %d\n",
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ret);
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goto out_rem_irq;
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}
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platform_set_drvdata(pdev, ab8500_gpio);
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return 0;
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out_rem_irq:
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ab8500_gpio_irq_remove(ab8500_gpio);
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out_free:
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mutex_destroy(&ab8500_gpio->lock);
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kfree(ab8500_gpio);
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return ret;
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}
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/*
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* ab8500_gpio_remove() - remove Ab8500-gpio driver
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* @pdev : Platform device registered
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*/
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static int __devexit ab8500_gpio_remove(struct platform_device *pdev)
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{
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struct ab8500_gpio *ab8500_gpio = platform_get_drvdata(pdev);
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int ret;
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ret = gpiochip_remove(&ab8500_gpio->chip);
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if (ret < 0) {
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dev_err(ab8500_gpio->dev, "unable to remove gpiochip: %d\n",
|
|
ret);
|
|
return ret;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, NULL);
|
|
mutex_destroy(&ab8500_gpio->lock);
|
|
kfree(ab8500_gpio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver ab8500_gpio_driver = {
|
|
.driver = {
|
|
.name = "ab8500-gpio",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
.probe = ab8500_gpio_probe,
|
|
.remove = __devexit_p(ab8500_gpio_remove),
|
|
};
|
|
|
|
static int __init ab8500_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&ab8500_gpio_driver);
|
|
}
|
|
arch_initcall(ab8500_gpio_init);
|
|
|
|
static void __exit ab8500_gpio_exit(void)
|
|
{
|
|
platform_driver_unregister(&ab8500_gpio_driver);
|
|
}
|
|
module_exit(ab8500_gpio_exit);
|
|
|
|
MODULE_AUTHOR("BIBEK BASU <bibek.basu@stericsson.com>");
|
|
MODULE_DESCRIPTION("Driver allows to use AB8500 unused pins to be used as GPIO");
|
|
MODULE_ALIAS("platform:ab8500-gpio");
|
|
MODULE_LICENSE("GPL v2");
|