000af2c5a8
Support for the Stretch S6000 Xtensa core variant. Signed-off-by: Johannes Weiner <jw@emlix.com> Signed-off-by: Oskar Schirmer <os@emlix.com> Signed-off-by: Chris Zankel <chris@zankel.net>
71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* s6000 gpio driver
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*
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* Copyright (c) 2009 emlix GmbH
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* Authors: Oskar Schirmer <os@emlix.com>
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* Johannes Weiner <jw@emlix.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/gpio.h>
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#include <variant/hardware.h>
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#define S6_GPIO_DATA 0x000
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#define S6_GPIO_IS 0x404
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#define S6_GPIO_IBE 0x408
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#define S6_GPIO_IEV 0x40C
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#define S6_GPIO_IE 0x410
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#define S6_GPIO_RIS 0x414
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#define S6_GPIO_MIS 0x418
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#define S6_GPIO_IC 0x41C
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#define S6_GPIO_AFSEL 0x420
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#define S6_GPIO_DIR 0x800
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#define S6_GPIO_BANK(nr) ((nr) * 0x1000)
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#define S6_GPIO_MASK(nr) (4 << (nr))
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#define S6_GPIO_OFFSET(nr) \
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(S6_GPIO_BANK((nr) >> 3) + S6_GPIO_MASK((nr) & 7))
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static int direction_input(struct gpio_chip *chip, unsigned int off)
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{
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writeb(0, S6_REG_GPIO + S6_GPIO_DIR + S6_GPIO_OFFSET(off));
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return 0;
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}
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static int get(struct gpio_chip *chip, unsigned int off)
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{
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return readb(S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off));
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}
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static int direction_output(struct gpio_chip *chip, unsigned int off, int val)
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{
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unsigned rel = S6_GPIO_OFFSET(off);
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writeb(~0, S6_REG_GPIO + S6_GPIO_DIR + rel);
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writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + rel);
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return 0;
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}
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static void set(struct gpio_chip *chip, unsigned int off, int val)
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{
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writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off));
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}
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static struct gpio_chip gpiochip = {
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.owner = THIS_MODULE,
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.direction_input = direction_input,
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.get = get,
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.direction_output = direction_output,
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.set = set,
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.base = 0,
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.ngpio = 24,
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.can_sleep = 0, /* no blocking io needed */
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.exported = 0, /* no exporting to userspace */
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};
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static int gpio_init(void)
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{
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return gpiochip_add(&gpiochip);
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}
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device_initcall(gpio_init);
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