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[ARM] 4988/1: Add GPIO lib support to the EP93xx
Adds support for the generic GPIO lib to the EP93xx family. The gpio handling code has been moved from core.c to a new file called gpio.c. The GPIO based IRQ code has not been changed. Signed-off-by: Ryan Mallon <ryan@bluewatersys.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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Ryan Mallon
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Russell King
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Apr 19, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| /* | ||
| * linux/arch/arm/mach-ep93xx/gpio.c | ||
| * | ||
| * Generic EP93xx GPIO handling | ||
| * | ||
| * Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com> | ||
| * | ||
| * Based on code originally from: | ||
| * linux/arch/arm/mach-ep93xx/core.c | ||
| * | ||
| * This program is free software; you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License version 2 as | ||
| * published by the Free Software Foundation. | ||
| */ | ||
|
|
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| #include <linux/init.h> | ||
| #include <linux/module.h> | ||
| #include <linux/seq_file.h> | ||
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| #include <asm/arch/ep93xx-regs.h> | ||
| #include <asm/io.h> | ||
| #include <asm/gpio.h> | ||
|
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| struct ep93xx_gpio_chip { | ||
| struct gpio_chip chip; | ||
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| unsigned int data_reg; | ||
| unsigned int data_dir_reg; | ||
| }; | ||
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| #define to_ep93xx_gpio_chip(c) container_of(c, struct ep93xx_gpio_chip, chip) | ||
|
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| /* From core.c */ | ||
| extern void ep93xx_gpio_int_mask(unsigned line); | ||
| extern void ep93xx_gpio_update_int_params(unsigned port); | ||
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| static int ep93xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset) | ||
| { | ||
| struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | ||
| unsigned long flags; | ||
| u8 v; | ||
|
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| local_irq_save(flags); | ||
| v = __raw_readb(ep93xx_chip->data_dir_reg); | ||
| v &= ~(1 << offset); | ||
| __raw_writeb(v, ep93xx_chip->data_dir_reg); | ||
| local_irq_restore(flags); | ||
|
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| return 0; | ||
| } | ||
|
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| static int ep93xx_gpio_direction_output(struct gpio_chip *chip, | ||
| unsigned offset, int val) | ||
| { | ||
| struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | ||
| unsigned long flags; | ||
| int line; | ||
| u8 v; | ||
|
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| local_irq_save(flags); | ||
|
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| /* Set the value */ | ||
| v = __raw_readb(ep93xx_chip->data_reg); | ||
| if (val) | ||
| v |= (1 << offset); | ||
| else | ||
| v &= ~(1 << offset); | ||
| __raw_writeb(v, ep93xx_chip->data_reg); | ||
|
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| /* Drive as an output */ | ||
| line = chip->base + offset; | ||
| if (line <= EP93XX_GPIO_LINE_MAX_IRQ) { | ||
| /* Ports A/B/F */ | ||
| ep93xx_gpio_int_mask(line); | ||
| ep93xx_gpio_update_int_params(line >> 3); | ||
| } | ||
|
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| v = __raw_readb(ep93xx_chip->data_dir_reg); | ||
| v |= (1 << offset); | ||
| __raw_writeb(v, ep93xx_chip->data_dir_reg); | ||
|
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| local_irq_restore(flags); | ||
|
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| return 0; | ||
| } | ||
|
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| static int ep93xx_gpio_get(struct gpio_chip *chip, unsigned offset) | ||
| { | ||
| struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | ||
|
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| return !!(__raw_readb(ep93xx_chip->data_reg) & (1 << offset)); | ||
| } | ||
|
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| static void ep93xx_gpio_set(struct gpio_chip *chip, unsigned offset, int val) | ||
| { | ||
| struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | ||
| unsigned long flags; | ||
| u8 v; | ||
|
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| local_irq_save(flags); | ||
| v = __raw_readb(ep93xx_chip->data_reg); | ||
| if (val) | ||
| v |= (1 << offset); | ||
| else | ||
| v &= ~(1 << offset); | ||
| __raw_writeb(v, ep93xx_chip->data_reg); | ||
| local_irq_restore(flags); | ||
| } | ||
|
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| static void ep93xx_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip) | ||
| { | ||
| struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip); | ||
| u8 data_reg, data_dir_reg; | ||
| int i; | ||
|
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| data_reg = __raw_readb(ep93xx_chip->data_reg); | ||
| data_dir_reg = __raw_readb(ep93xx_chip->data_dir_reg); | ||
|
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| for (i = 0; i < chip->ngpio; i++) | ||
| seq_printf(s, "GPIO %s%d: %s %s\n", chip->label, i, | ||
| (data_reg & (1 << i)) ? "set" : "clear", | ||
| (data_dir_reg & (1 << i)) ? "out" : "in"); | ||
| } | ||
|
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| #define EP93XX_GPIO_BANK(name, dr, ddr, base_gpio) \ | ||
| { \ | ||
| .chip = { \ | ||
| .label = name, \ | ||
| .direction_input = ep93xx_gpio_direction_input, \ | ||
| .direction_output = ep93xx_gpio_direction_output, \ | ||
| .get = ep93xx_gpio_get, \ | ||
| .set = ep93xx_gpio_set, \ | ||
| .dbg_show = ep93xx_gpio_dbg_show, \ | ||
| .base = base_gpio, \ | ||
| .ngpio = 8, \ | ||
| }, \ | ||
| .data_reg = EP93XX_GPIO_REG(dr), \ | ||
| .data_dir_reg = EP93XX_GPIO_REG(ddr), \ | ||
| } | ||
|
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| static struct ep93xx_gpio_chip ep93xx_gpio_banks[] = { | ||
| EP93XX_GPIO_BANK("A", 0x00, 0x10, 0), | ||
| EP93XX_GPIO_BANK("B", 0x04, 0x14, 8), | ||
| EP93XX_GPIO_BANK("C", 0x30, 0x34, 40), | ||
| EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24), | ||
| EP93XX_GPIO_BANK("E", 0x20, 0x24, 32), | ||
| EP93XX_GPIO_BANK("F", 0x08, 0x18, 16), | ||
| EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48), | ||
| EP93XX_GPIO_BANK("H", 0x40, 0x44, 56), | ||
| }; | ||
|
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| void __init ep93xx_gpio_init(void) | ||
| { | ||
| int i; | ||
|
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| for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++) | ||
| gpiochip_add(&ep93xx_gpio_banks[i].chip); | ||
| } |
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