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471 lines
12 KiB
471 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* GPIO driver for the SMSC SCH311x Super-I/O chips |
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* |
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* Copyright (C) 2013 Bruno Randolf <[email protected]> |
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* |
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* SuperIO functions and chip detection: |
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* (c) Copyright 2008 Wim Van Sebroeck <[email protected]>. |
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*/ |
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#include <linux/ioport.h> |
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#include <linux/module.h> |
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#include <linux/kernel.h> |
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#include <linux/init.h> |
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#include <linux/platform_device.h> |
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#include <linux/gpio/driver.h> |
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#include <linux/bitops.h> |
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#include <linux/io.h> |
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#define DRV_NAME "gpio-sch311x" |
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#define SCH311X_GPIO_CONF_DIR BIT(0) |
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#define SCH311X_GPIO_CONF_INVERT BIT(1) |
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#define SCH311X_GPIO_CONF_OPEN_DRAIN BIT(7) |
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#define SIO_CONFIG_KEY_ENTER 0x55 |
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#define SIO_CONFIG_KEY_EXIT 0xaa |
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#define GP1 0x4b |
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static int sch311x_ioports[] = { 0x2e, 0x4e, 0x162e, 0x164e }; |
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static struct platform_device *sch311x_gpio_pdev; |
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struct sch311x_pdev_data { /* platform device data */ |
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unsigned short runtime_reg; /* runtime register base address */ |
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}; |
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struct sch311x_gpio_block { /* one GPIO block runtime data */ |
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struct gpio_chip chip; |
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unsigned short data_reg; /* from definition below */ |
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unsigned short *config_regs; /* pointer to definition below */ |
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unsigned short runtime_reg; /* runtime register */ |
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spinlock_t lock; /* lock for this GPIO block */ |
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}; |
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struct sch311x_gpio_priv { /* driver private data */ |
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struct sch311x_gpio_block blocks[6]; |
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}; |
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struct sch311x_gpio_block_def { /* register address definitions */ |
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unsigned short data_reg; |
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unsigned short config_regs[8]; |
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unsigned short base; |
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}; |
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/* Note: some GPIOs are not available, these are marked with 0x00 */ |
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static struct sch311x_gpio_block_def sch311x_gpio_blocks[] = { |
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{ |
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.data_reg = 0x4b, /* GP1 */ |
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.config_regs = {0x23, 0x24, 0x25, 0x26, 0x27, 0x29, 0x2a, 0x2b}, |
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.base = 10, |
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}, |
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{ |
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.data_reg = 0x4c, /* GP2 */ |
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.config_regs = {0x00, 0x2c, 0x2d, 0x00, 0x00, 0x00, 0x00, 0x32}, |
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.base = 20, |
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}, |
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{ |
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.data_reg = 0x4d, /* GP3 */ |
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.config_regs = {0x33, 0x34, 0x35, 0x36, 0x37, 0x00, 0x39, 0x3a}, |
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.base = 30, |
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}, |
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{ |
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.data_reg = 0x4e, /* GP4 */ |
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.config_regs = {0x3b, 0x00, 0x3d, 0x00, 0x6e, 0x6f, 0x72, 0x73}, |
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.base = 40, |
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}, |
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{ |
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.data_reg = 0x4f, /* GP5 */ |
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.config_regs = {0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46}, |
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.base = 50, |
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}, |
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{ |
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.data_reg = 0x50, /* GP6 */ |
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.config_regs = {0x47, 0x48, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59}, |
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.base = 60, |
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}, |
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}; |
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/* |
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* Super-IO functions |
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*/ |
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static inline int sch311x_sio_enter(int sio_config_port) |
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{ |
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/* Don't step on other drivers' I/O space by accident. */ |
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if (!request_muxed_region(sio_config_port, 2, DRV_NAME)) { |
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pr_err(DRV_NAME "I/O address 0x%04x already in use\n", |
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sio_config_port); |
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return -EBUSY; |
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} |
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outb(SIO_CONFIG_KEY_ENTER, sio_config_port); |
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return 0; |
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} |
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static inline void sch311x_sio_exit(int sio_config_port) |
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{ |
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outb(SIO_CONFIG_KEY_EXIT, sio_config_port); |
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release_region(sio_config_port, 2); |
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} |
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static inline int sch311x_sio_inb(int sio_config_port, int reg) |
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{ |
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outb(reg, sio_config_port); |
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return inb(sio_config_port + 1); |
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} |
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static inline void sch311x_sio_outb(int sio_config_port, int reg, int val) |
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{ |
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outb(reg, sio_config_port); |
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outb(val, sio_config_port + 1); |
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} |
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/* |
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* GPIO functions |
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*/ |
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static int sch311x_gpio_request(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct sch311x_gpio_block *block = gpiochip_get_data(chip); |
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if (block->config_regs[offset] == 0) /* GPIO is not available */ |
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return -ENODEV; |
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if (!request_region(block->runtime_reg + block->config_regs[offset], |
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1, DRV_NAME)) { |
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dev_err(chip->parent, "Failed to request region 0x%04x.\n", |
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block->runtime_reg + block->config_regs[offset]); |
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return -EBUSY; |
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} |
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return 0; |
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} |
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static void sch311x_gpio_free(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct sch311x_gpio_block *block = gpiochip_get_data(chip); |
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if (block->config_regs[offset] == 0) /* GPIO is not available */ |
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return; |
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release_region(block->runtime_reg + block->config_regs[offset], 1); |
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} |
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static int sch311x_gpio_get(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct sch311x_gpio_block *block = gpiochip_get_data(chip); |
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u8 data; |
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spin_lock(&block->lock); |
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data = inb(block->runtime_reg + block->data_reg); |
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spin_unlock(&block->lock); |
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return !!(data & BIT(offset)); |
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} |
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static void __sch311x_gpio_set(struct sch311x_gpio_block *block, |
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unsigned offset, int value) |
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{ |
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u8 data = inb(block->runtime_reg + block->data_reg); |
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if (value) |
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data |= BIT(offset); |
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else |
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data &= ~BIT(offset); |
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outb(data, block->runtime_reg + block->data_reg); |
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} |
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static void sch311x_gpio_set(struct gpio_chip *chip, unsigned offset, |
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int value) |
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{ |
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struct sch311x_gpio_block *block = gpiochip_get_data(chip); |
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spin_lock(&block->lock); |
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__sch311x_gpio_set(block, offset, value); |
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spin_unlock(&block->lock); |
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} |
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static int sch311x_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct sch311x_gpio_block *block = gpiochip_get_data(chip); |
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u8 data; |
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spin_lock(&block->lock); |
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data = inb(block->runtime_reg + block->config_regs[offset]); |
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data |= SCH311X_GPIO_CONF_DIR; |
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outb(data, block->runtime_reg + block->config_regs[offset]); |
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spin_unlock(&block->lock); |
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return 0; |
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} |
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static int sch311x_gpio_direction_out(struct gpio_chip *chip, unsigned offset, |
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int value) |
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{ |
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struct sch311x_gpio_block *block = gpiochip_get_data(chip); |
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u8 data; |
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spin_lock(&block->lock); |
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data = inb(block->runtime_reg + block->config_regs[offset]); |
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data &= ~SCH311X_GPIO_CONF_DIR; |
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outb(data, block->runtime_reg + block->config_regs[offset]); |
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__sch311x_gpio_set(block, offset, value); |
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spin_unlock(&block->lock); |
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return 0; |
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} |
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static int sch311x_gpio_get_direction(struct gpio_chip *chip, unsigned offset) |
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{ |
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struct sch311x_gpio_block *block = gpiochip_get_data(chip); |
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u8 data; |
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spin_lock(&block->lock); |
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data = inb(block->runtime_reg + block->config_regs[offset]); |
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spin_unlock(&block->lock); |
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if (data & SCH311X_GPIO_CONF_DIR) |
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return GPIO_LINE_DIRECTION_IN; |
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return GPIO_LINE_DIRECTION_OUT; |
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} |
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static int sch311x_gpio_set_config(struct gpio_chip *chip, unsigned offset, |
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unsigned long config) |
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{ |
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struct sch311x_gpio_block *block = gpiochip_get_data(chip); |
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enum pin_config_param param = pinconf_to_config_param(config); |
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u8 data; |
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switch (param) { |
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case PIN_CONFIG_DRIVE_OPEN_DRAIN: |
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spin_lock(&block->lock); |
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data = inb(block->runtime_reg + block->config_regs[offset]); |
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data |= SCH311X_GPIO_CONF_OPEN_DRAIN; |
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outb(data, block->runtime_reg + block->config_regs[offset]); |
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spin_unlock(&block->lock); |
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return 0; |
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case PIN_CONFIG_DRIVE_PUSH_PULL: |
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spin_lock(&block->lock); |
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data = inb(block->runtime_reg + block->config_regs[offset]); |
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data &= ~SCH311X_GPIO_CONF_OPEN_DRAIN; |
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outb(data, block->runtime_reg + block->config_regs[offset]); |
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spin_unlock(&block->lock); |
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return 0; |
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default: |
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break; |
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} |
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return -ENOTSUPP; |
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} |
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static int sch311x_gpio_probe(struct platform_device *pdev) |
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{ |
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struct sch311x_pdev_data *pdata = dev_get_platdata(&pdev->dev); |
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struct sch311x_gpio_priv *priv; |
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struct sch311x_gpio_block *block; |
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int err, i; |
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/* we can register all GPIO data registers at once */ |
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if (!devm_request_region(&pdev->dev, pdata->runtime_reg + GP1, 6, |
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DRV_NAME)) { |
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dev_err(&pdev->dev, "Failed to request region 0x%04x-0x%04x.\n", |
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pdata->runtime_reg + GP1, pdata->runtime_reg + GP1 + 5); |
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return -EBUSY; |
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} |
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
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if (!priv) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, priv); |
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for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) { |
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block = &priv->blocks[i]; |
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spin_lock_init(&block->lock); |
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block->chip.label = DRV_NAME; |
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block->chip.owner = THIS_MODULE; |
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block->chip.request = sch311x_gpio_request; |
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block->chip.free = sch311x_gpio_free; |
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block->chip.direction_input = sch311x_gpio_direction_in; |
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block->chip.direction_output = sch311x_gpio_direction_out; |
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block->chip.get_direction = sch311x_gpio_get_direction; |
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block->chip.set_config = sch311x_gpio_set_config; |
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block->chip.get = sch311x_gpio_get; |
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block->chip.set = sch311x_gpio_set; |
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block->chip.ngpio = 8; |
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block->chip.parent = &pdev->dev; |
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block->chip.base = sch311x_gpio_blocks[i].base; |
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block->config_regs = sch311x_gpio_blocks[i].config_regs; |
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block->data_reg = sch311x_gpio_blocks[i].data_reg; |
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block->runtime_reg = pdata->runtime_reg; |
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err = gpiochip_add_data(&block->chip, block); |
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if (err < 0) { |
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dev_err(&pdev->dev, |
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"Could not register gpiochip, %d\n", err); |
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goto exit_err; |
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} |
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dev_info(&pdev->dev, |
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"SMSC SCH311x GPIO block %d registered.\n", i); |
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} |
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return 0; |
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exit_err: |
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/* release already registered chips */ |
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for (--i; i >= 0; i--) |
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gpiochip_remove(&priv->blocks[i].chip); |
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return err; |
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} |
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static int sch311x_gpio_remove(struct platform_device *pdev) |
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{ |
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struct sch311x_gpio_priv *priv = platform_get_drvdata(pdev); |
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int i; |
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for (i = 0; i < ARRAY_SIZE(priv->blocks); i++) { |
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gpiochip_remove(&priv->blocks[i].chip); |
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dev_info(&pdev->dev, |
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"SMSC SCH311x GPIO block %d unregistered.\n", i); |
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} |
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return 0; |
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} |
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static struct platform_driver sch311x_gpio_driver = { |
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.driver.name = DRV_NAME, |
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.probe = sch311x_gpio_probe, |
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.remove = sch311x_gpio_remove, |
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}; |
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/* |
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* Init & exit routines |
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*/ |
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static int __init sch311x_detect(int sio_config_port, unsigned short *addr) |
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{ |
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int err = 0, reg; |
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unsigned short base_addr; |
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u8 dev_id; |
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err = sch311x_sio_enter(sio_config_port); |
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if (err) |
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return err; |
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/* Check device ID. */ |
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reg = sch311x_sio_inb(sio_config_port, 0x20); |
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switch (reg) { |
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case 0x7c: /* SCH3112 */ |
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dev_id = 2; |
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break; |
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case 0x7d: /* SCH3114 */ |
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dev_id = 4; |
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break; |
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case 0x7f: /* SCH3116 */ |
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dev_id = 6; |
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break; |
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default: |
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err = -ENODEV; |
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goto exit; |
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} |
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/* Select logical device A (runtime registers) */ |
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sch311x_sio_outb(sio_config_port, 0x07, 0x0a); |
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/* Check if Logical Device Register is currently active */ |
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if ((sch311x_sio_inb(sio_config_port, 0x30) & 0x01) == 0) |
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pr_info("Seems that LDN 0x0a is not active...\n"); |
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/* Get the base address of the runtime registers */ |
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base_addr = (sch311x_sio_inb(sio_config_port, 0x60) << 8) | |
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sch311x_sio_inb(sio_config_port, 0x61); |
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if (!base_addr) { |
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pr_err("Base address not set\n"); |
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err = -ENODEV; |
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goto exit; |
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} |
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*addr = base_addr; |
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pr_info("Found an SMSC SCH311%d chip at 0x%04x\n", dev_id, base_addr); |
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exit: |
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sch311x_sio_exit(sio_config_port); |
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return err; |
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} |
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static int __init sch311x_gpio_pdev_add(const unsigned short addr) |
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{ |
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struct sch311x_pdev_data pdata; |
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int err; |
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pdata.runtime_reg = addr; |
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sch311x_gpio_pdev = platform_device_alloc(DRV_NAME, -1); |
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if (!sch311x_gpio_pdev) |
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return -ENOMEM; |
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err = platform_device_add_data(sch311x_gpio_pdev, |
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&pdata, sizeof(pdata)); |
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if (err) { |
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pr_err(DRV_NAME "Platform data allocation failed\n"); |
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goto err; |
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} |
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err = platform_device_add(sch311x_gpio_pdev); |
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if (err) { |
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pr_err(DRV_NAME "Device addition failed\n"); |
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goto err; |
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} |
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return 0; |
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err: |
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platform_device_put(sch311x_gpio_pdev); |
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return err; |
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} |
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static int __init sch311x_gpio_init(void) |
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{ |
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int err, i; |
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unsigned short addr = 0; |
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for (i = 0; i < ARRAY_SIZE(sch311x_ioports); i++) |
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if (sch311x_detect(sch311x_ioports[i], &addr) == 0) |
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break; |
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if (!addr) |
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return -ENODEV; |
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err = platform_driver_register(&sch311x_gpio_driver); |
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if (err) |
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return err; |
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err = sch311x_gpio_pdev_add(addr); |
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if (err) |
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goto unreg_platform_driver; |
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return 0; |
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unreg_platform_driver: |
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platform_driver_unregister(&sch311x_gpio_driver); |
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return err; |
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} |
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static void __exit sch311x_gpio_exit(void) |
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{ |
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platform_device_unregister(sch311x_gpio_pdev); |
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platform_driver_unregister(&sch311x_gpio_driver); |
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} |
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module_init(sch311x_gpio_init); |
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module_exit(sch311x_gpio_exit); |
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MODULE_AUTHOR("Bruno Randolf <[email protected]>"); |
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MODULE_DESCRIPTION("SMSC SCH311x GPIO Driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:gpio-sch311x");
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