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https://github.com/brain-hackers/u-boot-brain
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cedd341d55
This patch adds driver for a trivial gpio core, which is described in http://nioswiki.com/GPIO. It is used for gpio led and nand flash interface in u-boot. When CONFIG_SYS_GPIO_BASE is not defined, board may provide its own driver. Signed-off-by: Thomas Chou <thomas@wytron.com.tw> Tested-by: Ian Abbott <abbotti@mev.co.uk> Signed-off-by: Scott McNutt <smcnutt@psyent.com>
53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
/*
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* nios2 gpio driver
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*
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* This gpio core is described in http://nioswiki.com/GPIO
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* bit[0] data
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* bit[1] output enable
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*
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* when CONFIG_SYS_GPIO_BASE is not defined, board may provide
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* its own driver.
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*
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* Copyright (C) 2010 Thomas Chou <thomas@wytron.com.tw>
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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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#ifndef _ASM_NIOS2_GPIO_H_
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#define _ASM_NIOS2_GPIO_H_
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#ifdef CONFIG_SYS_GPIO_BASE
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#include <asm/io.h>
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static inline int gpio_direction_input(unsigned gpio)
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{
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writel(1, CONFIG_SYS_GPIO_BASE + (gpio << 2));
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return 0;
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}
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static inline int gpio_direction_output(unsigned gpio, int value)
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{
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writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2));
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return 0;
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}
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static inline int gpio_get_value(unsigned gpio)
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{
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return readl(CONFIG_SYS_GPIO_BASE + (gpio << 2));
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}
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static inline void gpio_set_value(unsigned gpio, int value)
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{
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writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2));
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}
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#else
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extern int gpio_direction_input(unsigned gpio);
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extern int gpio_direction_output(unsigned gpio, int value);
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extern int gpio_get_value(unsigned gpio);
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extern void gpio_set_value(unsigned gpio, int value);
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#endif /* CONFIG_SYS_GPIO_BASE */
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#endif /* _ASM_NIOS2_GPIO_H_ */
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