607 lines
16 KiB
C
607 lines
16 KiB
C
/*
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* Toumaz Xenif TZ1090 GPIO handling.
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*
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* Copyright (C) 2008-2013 Imagination Technologies Ltd.
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*
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* Based on ARM PXA code and others.
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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/bitops.h>
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#include <linux/export.h>
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#include <linux/gpio.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/kernel.h>
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#include <linux/of_irq.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/syscore_ops.h>
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#include <asm/global_lock.h>
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/* Register offsets from bank base address */
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#define REG_GPIO_DIR 0x00
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#define REG_GPIO_IRQ_PLRT 0x20
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#define REG_GPIO_IRQ_TYPE 0x30
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#define REG_GPIO_IRQ_EN 0x40
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#define REG_GPIO_IRQ_STS 0x50
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#define REG_GPIO_BIT_EN 0x60
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#define REG_GPIO_DIN 0x70
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#define REG_GPIO_DOUT 0x80
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/* REG_GPIO_IRQ_PLRT */
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#define REG_GPIO_IRQ_PLRT_LOW 0
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#define REG_GPIO_IRQ_PLRT_HIGH 1
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/* REG_GPIO_IRQ_TYPE */
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#define REG_GPIO_IRQ_TYPE_LEVEL 0
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#define REG_GPIO_IRQ_TYPE_EDGE 1
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/**
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* struct tz1090_gpio_bank - GPIO bank private data
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* @chip: Generic GPIO chip for GPIO bank
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* @domain: IRQ domain for GPIO bank (may be NULL)
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* @reg: Base of registers, offset for this GPIO bank
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* @irq: IRQ number for GPIO bank
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* @label: Debug GPIO bank label, used for storage of chip->label
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*
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* This is the main private data for a GPIO bank. It encapsulates a gpio_chip,
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* and the callbacks for the gpio_chip can access the private data with the
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* to_bank() macro below.
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*/
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struct tz1090_gpio_bank {
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struct gpio_chip chip;
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struct irq_domain *domain;
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void __iomem *reg;
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int irq;
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char label[16];
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};
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#define to_bank(c) container_of(c, struct tz1090_gpio_bank, chip)
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/**
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* struct tz1090_gpio - Overall GPIO device private data
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* @dev: Device (from platform device)
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* @reg: Base of GPIO registers
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*
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* Represents the overall GPIO device. This structure is actually only
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* temporary, and used during init.
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*/
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struct tz1090_gpio {
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struct device *dev;
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void __iomem *reg;
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};
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/**
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* struct tz1090_gpio_bank_info - Temporary registration info for GPIO bank
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* @priv: Overall GPIO device private data
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* @node: Device tree node specific to this GPIO bank
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* @index: Index of bank in range 0-2
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*/
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struct tz1090_gpio_bank_info {
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struct tz1090_gpio *priv;
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struct device_node *node;
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unsigned int index;
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};
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/* Convenience register accessors */
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static inline void tz1090_gpio_write(struct tz1090_gpio_bank *bank,
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unsigned int reg_offs, u32 data)
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{
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iowrite32(data, bank->reg + reg_offs);
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}
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static inline u32 tz1090_gpio_read(struct tz1090_gpio_bank *bank,
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unsigned int reg_offs)
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{
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return ioread32(bank->reg + reg_offs);
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}
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/* caller must hold LOCK2 */
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static inline void _tz1090_gpio_clear_bit(struct tz1090_gpio_bank *bank,
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unsigned int reg_offs,
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unsigned int offset)
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{
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u32 value;
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value = tz1090_gpio_read(bank, reg_offs);
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value &= ~BIT(offset);
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tz1090_gpio_write(bank, reg_offs, value);
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}
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static void tz1090_gpio_clear_bit(struct tz1090_gpio_bank *bank,
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unsigned int reg_offs,
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unsigned int offset)
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{
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int lstat;
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__global_lock2(lstat);
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_tz1090_gpio_clear_bit(bank, reg_offs, offset);
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__global_unlock2(lstat);
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}
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/* caller must hold LOCK2 */
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static inline void _tz1090_gpio_set_bit(struct tz1090_gpio_bank *bank,
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unsigned int reg_offs,
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unsigned int offset)
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{
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u32 value;
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value = tz1090_gpio_read(bank, reg_offs);
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value |= BIT(offset);
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tz1090_gpio_write(bank, reg_offs, value);
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}
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static void tz1090_gpio_set_bit(struct tz1090_gpio_bank *bank,
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unsigned int reg_offs,
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unsigned int offset)
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{
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int lstat;
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__global_lock2(lstat);
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_tz1090_gpio_set_bit(bank, reg_offs, offset);
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__global_unlock2(lstat);
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}
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/* caller must hold LOCK2 */
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static inline void _tz1090_gpio_mod_bit(struct tz1090_gpio_bank *bank,
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unsigned int reg_offs,
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unsigned int offset,
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bool val)
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{
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u32 value;
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value = tz1090_gpio_read(bank, reg_offs);
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value &= ~BIT(offset);
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if (val)
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value |= BIT(offset);
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tz1090_gpio_write(bank, reg_offs, value);
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}
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static void tz1090_gpio_mod_bit(struct tz1090_gpio_bank *bank,
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unsigned int reg_offs,
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unsigned int offset,
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bool val)
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{
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int lstat;
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__global_lock2(lstat);
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_tz1090_gpio_mod_bit(bank, reg_offs, offset, val);
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__global_unlock2(lstat);
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}
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static inline int tz1090_gpio_read_bit(struct tz1090_gpio_bank *bank,
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unsigned int reg_offs,
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unsigned int offset)
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{
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return tz1090_gpio_read(bank, reg_offs) & BIT(offset);
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}
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/* GPIO chip callbacks */
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static int tz1090_gpio_direction_input(struct gpio_chip *chip,
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unsigned int offset)
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{
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struct tz1090_gpio_bank *bank = to_bank(chip);
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tz1090_gpio_set_bit(bank, REG_GPIO_DIR, offset);
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return 0;
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}
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static int tz1090_gpio_direction_output(struct gpio_chip *chip,
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unsigned int offset, int output_value)
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{
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struct tz1090_gpio_bank *bank = to_bank(chip);
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int lstat;
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__global_lock2(lstat);
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_tz1090_gpio_mod_bit(bank, REG_GPIO_DOUT, offset, output_value);
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_tz1090_gpio_clear_bit(bank, REG_GPIO_DIR, offset);
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__global_unlock2(lstat);
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return 0;
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}
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/*
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* Return GPIO level
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*/
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static int tz1090_gpio_get(struct gpio_chip *chip, unsigned int offset)
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{
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struct tz1090_gpio_bank *bank = to_bank(chip);
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return tz1090_gpio_read_bit(bank, REG_GPIO_DIN, offset);
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}
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/*
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* Set output GPIO level
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*/
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static void tz1090_gpio_set(struct gpio_chip *chip, unsigned int offset,
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int output_value)
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{
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struct tz1090_gpio_bank *bank = to_bank(chip);
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tz1090_gpio_mod_bit(bank, REG_GPIO_DOUT, offset, output_value);
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}
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static int tz1090_gpio_request(struct gpio_chip *chip, unsigned int offset)
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{
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struct tz1090_gpio_bank *bank = to_bank(chip);
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int ret;
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ret = pinctrl_request_gpio(chip->base + offset);
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if (ret)
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return ret;
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tz1090_gpio_set_bit(bank, REG_GPIO_DIR, offset);
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tz1090_gpio_set_bit(bank, REG_GPIO_BIT_EN, offset);
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return 0;
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}
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static void tz1090_gpio_free(struct gpio_chip *chip, unsigned int offset)
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{
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struct tz1090_gpio_bank *bank = to_bank(chip);
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pinctrl_free_gpio(chip->base + offset);
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tz1090_gpio_clear_bit(bank, REG_GPIO_BIT_EN, offset);
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}
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static int tz1090_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
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{
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struct tz1090_gpio_bank *bank = to_bank(chip);
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if (!bank->domain)
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return -EINVAL;
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return irq_create_mapping(bank->domain, offset);
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}
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/* IRQ chip handlers */
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/* Get TZ1090 GPIO chip from irq data provided to generic IRQ callbacks */
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static inline struct tz1090_gpio_bank *irqd_to_gpio_bank(struct irq_data *data)
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{
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return (struct tz1090_gpio_bank *)data->domain->host_data;
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}
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static void tz1090_gpio_irq_polarity(struct tz1090_gpio_bank *bank,
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unsigned int offset, unsigned int polarity)
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{
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tz1090_gpio_mod_bit(bank, REG_GPIO_IRQ_PLRT, offset, polarity);
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}
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static void tz1090_gpio_irq_type(struct tz1090_gpio_bank *bank,
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unsigned int offset, unsigned int type)
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{
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tz1090_gpio_mod_bit(bank, REG_GPIO_IRQ_TYPE, offset, type);
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}
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/* set polarity to trigger on next edge, whether rising or falling */
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static void tz1090_gpio_irq_next_edge(struct tz1090_gpio_bank *bank,
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unsigned int offset)
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{
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unsigned int value_p, value_i;
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int lstat;
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/*
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* Set the GPIO's interrupt polarity to the opposite of the current
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* input value so that the next edge triggers an interrupt.
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*/
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__global_lock2(lstat);
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value_i = ~tz1090_gpio_read(bank, REG_GPIO_DIN);
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value_p = tz1090_gpio_read(bank, REG_GPIO_IRQ_PLRT);
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value_p &= ~BIT(offset);
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value_p |= value_i & BIT(offset);
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tz1090_gpio_write(bank, REG_GPIO_IRQ_PLRT, value_p);
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__global_unlock2(lstat);
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}
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static unsigned int gpio_startup_irq(struct irq_data *data)
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{
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/*
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* This warning indicates that the type of the irq hasn't been set
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* before enabling the irq. This would normally be done by passing some
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* trigger flags to request_irq().
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*/
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WARN(irqd_get_trigger_type(data) == IRQ_TYPE_NONE,
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"irq type not set before enabling gpio irq %d", data->irq);
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irq_gc_ack_clr_bit(data);
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irq_gc_mask_set_bit(data);
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return 0;
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}
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static int gpio_set_irq_type(struct irq_data *data, unsigned int flow_type)
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{
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struct tz1090_gpio_bank *bank = irqd_to_gpio_bank(data);
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unsigned int type;
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unsigned int polarity;
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switch (flow_type) {
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case IRQ_TYPE_EDGE_BOTH:
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type = REG_GPIO_IRQ_TYPE_EDGE;
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polarity = REG_GPIO_IRQ_PLRT_LOW;
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break;
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case IRQ_TYPE_EDGE_RISING:
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type = REG_GPIO_IRQ_TYPE_EDGE;
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polarity = REG_GPIO_IRQ_PLRT_HIGH;
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break;
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case IRQ_TYPE_EDGE_FALLING:
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type = REG_GPIO_IRQ_TYPE_EDGE;
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polarity = REG_GPIO_IRQ_PLRT_LOW;
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break;
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case IRQ_TYPE_LEVEL_HIGH:
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type = REG_GPIO_IRQ_TYPE_LEVEL;
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polarity = REG_GPIO_IRQ_PLRT_HIGH;
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break;
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case IRQ_TYPE_LEVEL_LOW:
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type = REG_GPIO_IRQ_TYPE_LEVEL;
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polarity = REG_GPIO_IRQ_PLRT_LOW;
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break;
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default:
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return -EINVAL;
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}
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tz1090_gpio_irq_type(bank, data->hwirq, type);
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irq_setup_alt_chip(data, flow_type);
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if (flow_type == IRQ_TYPE_EDGE_BOTH)
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tz1090_gpio_irq_next_edge(bank, data->hwirq);
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else
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tz1090_gpio_irq_polarity(bank, data->hwirq, polarity);
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return 0;
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}
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#ifdef CONFIG_SUSPEND
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static int gpio_set_irq_wake(struct irq_data *data, unsigned int on)
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{
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struct tz1090_gpio_bank *bank = irqd_to_gpio_bank(data);
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#ifdef CONFIG_PM_DEBUG
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pr_info("irq_wake irq%d state:%d\n", data->irq, on);
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#endif
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/* wake on gpio block interrupt */
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return irq_set_irq_wake(bank->irq, on);
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}
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#else
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#define gpio_set_irq_wake NULL
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#endif
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static void tz1090_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
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{
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irq_hw_number_t hw;
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unsigned int irq_stat, irq_no;
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struct tz1090_gpio_bank *bank;
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struct irq_desc *child_desc;
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bank = (struct tz1090_gpio_bank *)irq_desc_get_handler_data(desc);
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irq_stat = tz1090_gpio_read(bank, REG_GPIO_DIR) &
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tz1090_gpio_read(bank, REG_GPIO_IRQ_STS) &
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tz1090_gpio_read(bank, REG_GPIO_IRQ_EN) &
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0x3FFFFFFF; /* 30 bits only */
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for (hw = 0; irq_stat; irq_stat >>= 1, ++hw) {
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if (!(irq_stat & 1))
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continue;
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irq_no = irq_linear_revmap(bank->domain, hw);
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child_desc = irq_to_desc(irq_no);
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/* Toggle edge for pin with both edges triggering enabled */
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if (irqd_get_trigger_type(&child_desc->irq_data)
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== IRQ_TYPE_EDGE_BOTH)
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tz1090_gpio_irq_next_edge(bank, hw);
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generic_handle_irq_desc(irq_no, child_desc);
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}
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}
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static int tz1090_gpio_bank_probe(struct tz1090_gpio_bank_info *info)
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{
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struct device_node *np = info->node;
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struct device *dev = info->priv->dev;
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struct tz1090_gpio_bank *bank;
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struct irq_chip_generic *gc;
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int err;
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bank = devm_kzalloc(dev, sizeof(*bank), GFP_KERNEL);
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if (!bank) {
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dev_err(dev, "unable to allocate driver data\n");
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return -ENOMEM;
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}
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/* Offset the main registers to the first register in this bank */
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bank->reg = info->priv->reg + info->index * 4;
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/* Set up GPIO chip */
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snprintf(bank->label, sizeof(bank->label), "tz1090-gpio-%u",
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info->index);
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bank->chip.label = bank->label;
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bank->chip.dev = dev;
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bank->chip.direction_input = tz1090_gpio_direction_input;
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bank->chip.direction_output = tz1090_gpio_direction_output;
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bank->chip.get = tz1090_gpio_get;
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bank->chip.set = tz1090_gpio_set;
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bank->chip.free = tz1090_gpio_free;
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bank->chip.request = tz1090_gpio_request;
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bank->chip.to_irq = tz1090_gpio_to_irq;
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bank->chip.of_node = np;
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/* GPIO numbering from 0 */
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bank->chip.base = info->index * 30;
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bank->chip.ngpio = 30;
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/* Add the GPIO bank */
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gpiochip_add(&bank->chip);
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/* Get the GPIO bank IRQ if provided */
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bank->irq = irq_of_parse_and_map(np, 0);
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/* The interrupt is optional (it may be used by another core on chip) */
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if (bank->irq < 0) {
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dev_info(dev, "IRQ not provided for bank %u, IRQs disabled\n",
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info->index);
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return 0;
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}
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dev_info(dev, "Setting up IRQs for GPIO bank %u\n",
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info->index);
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/*
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* Initialise all interrupts to disabled so we don't get
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* spurious ones on a dirty boot and hit the BUG_ON in the
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* handler.
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*/
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tz1090_gpio_write(bank, REG_GPIO_IRQ_EN, 0);
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/* Add a virtual IRQ for each GPIO */
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bank->domain = irq_domain_add_linear(np,
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bank->chip.ngpio,
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&irq_generic_chip_ops,
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bank);
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/* Set up a generic irq chip with 2 chip types (level and edge) */
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err = irq_alloc_domain_generic_chips(bank->domain, bank->chip.ngpio, 2,
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bank->label, handle_bad_irq, 0, 0,
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IRQ_GC_INIT_NESTED_LOCK);
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if (err) {
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dev_info(dev,
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"irq_alloc_domain_generic_chips failed for bank %u, IRQs disabled\n",
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info->index);
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irq_domain_remove(bank->domain);
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return 0;
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}
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gc = irq_get_domain_generic_chip(bank->domain, 0);
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gc->reg_base = bank->reg;
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/* level chip type */
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gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK;
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gc->chip_types[0].handler = handle_level_irq;
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gc->chip_types[0].regs.ack = REG_GPIO_IRQ_STS;
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gc->chip_types[0].regs.mask = REG_GPIO_IRQ_EN;
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gc->chip_types[0].chip.irq_startup = gpio_startup_irq,
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gc->chip_types[0].chip.irq_ack = irq_gc_ack_clr_bit,
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gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit,
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gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit,
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gc->chip_types[0].chip.irq_set_type = gpio_set_irq_type,
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gc->chip_types[0].chip.irq_set_wake = gpio_set_irq_wake,
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gc->chip_types[0].chip.flags = IRQCHIP_MASK_ON_SUSPEND,
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/* edge chip type */
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gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH;
|
|
gc->chip_types[1].handler = handle_edge_irq;
|
|
gc->chip_types[1].regs.ack = REG_GPIO_IRQ_STS;
|
|
gc->chip_types[1].regs.mask = REG_GPIO_IRQ_EN;
|
|
gc->chip_types[1].chip.irq_startup = gpio_startup_irq,
|
|
gc->chip_types[1].chip.irq_ack = irq_gc_ack_clr_bit,
|
|
gc->chip_types[1].chip.irq_mask = irq_gc_mask_clr_bit,
|
|
gc->chip_types[1].chip.irq_unmask = irq_gc_mask_set_bit,
|
|
gc->chip_types[1].chip.irq_set_type = gpio_set_irq_type,
|
|
gc->chip_types[1].chip.irq_set_wake = gpio_set_irq_wake,
|
|
gc->chip_types[1].chip.flags = IRQCHIP_MASK_ON_SUSPEND,
|
|
|
|
/* Setup chained handler for this GPIO bank */
|
|
irq_set_handler_data(bank->irq, bank);
|
|
irq_set_chained_handler(bank->irq, tz1090_gpio_irq_handler);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void tz1090_gpio_register_banks(struct tz1090_gpio *priv)
|
|
{
|
|
struct device_node *np = priv->dev->of_node;
|
|
struct device_node *node;
|
|
|
|
for_each_available_child_of_node(np, node) {
|
|
struct tz1090_gpio_bank_info info;
|
|
u32 addr;
|
|
int ret;
|
|
|
|
ret = of_property_read_u32(node, "reg", &addr);
|
|
if (ret) {
|
|
dev_err(priv->dev, "invalid reg on %s\n",
|
|
node->full_name);
|
|
continue;
|
|
}
|
|
if (addr >= 3) {
|
|
dev_err(priv->dev, "index %u in %s out of range\n",
|
|
addr, node->full_name);
|
|
continue;
|
|
}
|
|
|
|
info.index = addr;
|
|
info.node = of_node_get(node);
|
|
info.priv = priv;
|
|
|
|
ret = tz1090_gpio_bank_probe(&info);
|
|
if (ret) {
|
|
dev_err(priv->dev, "failure registering %s\n",
|
|
node->full_name);
|
|
of_node_put(node);
|
|
continue;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int tz1090_gpio_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct resource *res_regs;
|
|
struct tz1090_gpio priv;
|
|
|
|
if (!np) {
|
|
dev_err(&pdev->dev, "must be instantiated via devicetree\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
res_regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (!res_regs) {
|
|
dev_err(&pdev->dev, "cannot find registers resource\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
priv.dev = &pdev->dev;
|
|
|
|
/* Ioremap the registers */
|
|
priv.reg = devm_ioremap(&pdev->dev, res_regs->start,
|
|
res_regs->end - res_regs->start);
|
|
if (!priv.reg) {
|
|
dev_err(&pdev->dev, "unable to ioremap registers\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/* Look for banks */
|
|
tz1090_gpio_register_banks(&priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id tz1090_gpio_of_match[] = {
|
|
{ .compatible = "img,tz1090-gpio" },
|
|
{ },
|
|
};
|
|
|
|
static struct platform_driver tz1090_gpio_driver = {
|
|
.driver = {
|
|
.name = "tz1090-gpio",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = tz1090_gpio_of_match,
|
|
},
|
|
.probe = tz1090_gpio_probe,
|
|
};
|
|
|
|
static int __init tz1090_gpio_init(void)
|
|
{
|
|
return platform_driver_register(&tz1090_gpio_driver);
|
|
}
|
|
subsys_initcall(tz1090_gpio_init);
|