Applied to:
git://git.denx.de/u-boot-nios.git next
Thanks, --Scott
Thomas Chou wrote:
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
v4: remove () from gpio when it is not in a macro. v3: arch dir reorganized.
arch/nios2/include/asm/gpio.h | 52 +++++++++++++++++++++++++++++++++++++++++ 1 files changed, 52 insertions(+), 0 deletions(-) create mode 100644 arch/nios2/include/asm/gpio.h
diff --git a/arch/nios2/include/asm/gpio.h b/arch/nios2/include/asm/gpio.h new file mode 100644 index 0000000..76c425e --- /dev/null +++ b/arch/nios2/include/asm/gpio.h @@ -0,0 +1,52 @@ +/*
- nios2 gpio driver
- This gpio core is described in http://nioswiki.com/GPIO
- bit[0] data
- bit[1] output enable
- when CONFIG_SYS_GPIO_BASE is not defined, board may provide
- its own driver.
- Copyright (C) 2010 Thomas Chou thomas@wytron.com.tw
- 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.
- */
+#ifndef _ASM_NIOS2_GPIO_H_ +#define _ASM_NIOS2_GPIO_H_
+#ifdef CONFIG_SYS_GPIO_BASE +#include <asm/io.h>
+static inline int gpio_direction_input(unsigned gpio) +{
- writel(1, CONFIG_SYS_GPIO_BASE + (gpio << 2));
- return 0;
+}
+static inline int gpio_direction_output(unsigned gpio, int value) +{
- writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2));
- return 0;
+}
+static inline int gpio_get_value(unsigned gpio) +{
- return readl(CONFIG_SYS_GPIO_BASE + (gpio << 2));
+}
+static inline void gpio_set_value(unsigned gpio, int value) +{
- writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + (gpio << 2));
+} +#else +extern int gpio_direction_input(unsigned gpio); +extern int gpio_direction_output(unsigned gpio, int value); +extern int gpio_get_value(unsigned gpio); +extern void gpio_set_value(unsigned gpio, int value); +#endif /* CONFIG_SYS_GPIO_BASE */
+#endif /* _ASM_NIOS2_GPIO_H_ */