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nios2: add gpio support with asm-nios2/gpio.h

PATCH Superseded Thomas Chou 2 participants 6 messages Mar 26, 2010 – Apr 17, 2010 NIOS2 architecture

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Thomas Chou

author
#0 lore raw

PATCH 1/1 nios2: add gpio support with asm-nios2/gpio.h

This patch adds driver for a trivial gpio core, which is described in http://nioswiki.com/GPIO.

Signed-off-by Thomas Chou <[email protected]>
---
 include/asm-nios2/gpio.h |   42 ++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 42 insertions(+), 0 deletions(-)
 create mode 100644 include/asm-nios2/gpio.h
include/asm-nios2/gpio.h new file +42 -0
new file mode 100644
index 0000000..ef8c9fd
@@ -0,0 +1,42 @@
+/*
+ * nios2 gpio driver
+ *
+ * This gpio core is described in http://nioswiki.com/GPIO
+ * bit[0] data
+ * bit[1] output enable
+ *
+ * Copyright (C) 2010 Thomas Chou <[email protected]>
+ *
+ * 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_ 1
+
+#include <asm/io.h>
+
+static inline int gpio_direction_input(unsigned pin)
+{
+	writel(1, CONFIG_SYS_GPIO_BASE + ((pin) << 2));
+	return 0;
+}
+
+static inline int gpio_direction_output(unsigned pin, int value)
+{
+	writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + ((pin) << 2));
+	return 0;
+}
+
+static inline int gpio_get_value(unsigned pin)
+{
+	return readl(CONFIG_SYS_GPIO_BASE + ((pin) << 2));
+}
+
+static inline void gpio_set_value(unsigned pin, int value)
+{
+	writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + ((pin) << 2));
+}
+
+#endif /* _ASM_NIOS2_GPIO_H_ */
Signature · 1 line
1.6.6.1
author
#1 lore raw

PATCH v2 1/1 nios2: add gpio support with asm-nios2/gpio.h

This patch adds driver for a trivial gpio core, which is described in http://nioswiki.com/GPIO.

When CONFIG_SYS_GPIO_BASE is not defined, board may provide its own driver.

Signed-off-by Thomas Chou <[email protected]>
---
 include/asm-nios2/gpio.h |   52 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 52 insertions(+), 0 deletions(-)
 create mode 100644 include/asm-nios2/gpio.h
include/asm-nios2/gpio.h new file +52 -0
new file mode 100644
index 0000000..cd2df7d
@@ -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 <[email protected]>
+ *
+ * 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_ 1
+
+#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_ */
Signature · 1 line
1.6.6.1
author
#2 lore raw

PATCH v3 1/1 nios2: add gpio support

In reply to Thomas Chou

This patch adds driver for a trivial gpio core, which is described in http://nioswiki.com/GPIO.

When CONFIG_SYS_GPIO_BASE is not defined, board may provide its own driver.

Signed-off-by Thomas Chou <[email protected]>

---
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
arch/nios2/include/asm/gpio.h new file +52 -0
new file mode 100644
index 0000000..cd2df7d
@@ -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 <[email protected]>
+ *
+ * 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_ 1
+
+#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_ */
Signature · 1 line
1.6.6.1
#3 lore raw

PATCH v3 1/1 nios2: add gpio support

Hello.

Quoted 56 lines · Thomas Chou

This patch adds driver for a trivial gpio core, which is described in http://nioswiki.com/GPIO.

When CONFIG_SYS_GPIO_BASE is not defined, board may provide its own driver.

Signed-off-by Thomas Chou <[email protected]>

---
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
arch/nios2/include/asm/gpio.h new file +34 -0
new file mode 100644
index 0000000..cd2df7d
@@ -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 <[email protected]>
+ *
+ * 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_ 1
+
+#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;
+}

arch/nios2/include/asm/gpio.h line 44

Quoted 10 lines
arch/nios2/include/asm/gpio.h new file +10 -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));
+}

Why enclose 'gpio' into () when it's not within a macro?

WBR, Sergei

author
#4 lore raw

PATCH v3 1/1 nios2: add gpio support

Quoted 8 lines · Sergei Shtylyov

arch/nios2/include/asm/gpio.h line 44

Quoted 4 lines
arch/nios2/include/asm/gpio.h new file +4 -0
+static inline void gpio_set_value(unsigned gpio, int value)
+{
+    writel(value ? 3 : 2, CONFIG_SYS_GPIO_BASE + ((gpio) << 2));
+}

Why enclose 'gpio' into () when it's not within a macro?

Hi Sergei,

Right. It is not not needed. Thanks.

Best regards,
Thomas

author
#5 lore raw

PATCH v4 1/1 nios2: add gpio support

In reply to Thomas Chou

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 <[email protected]>

---
remove () from gpio when it is not in a macro.

 arch/nios2/include/asm/gpio.h |   52 +++++++++++++++++++++++++++++++++++++++++
 1 files changed, 52 insertions(+), 0 deletions(-)
 create mode 100644 arch/nios2/include/asm/gpio.h
arch/nios2/include/asm/gpio.h new file +52 -0
new file mode 100644
index 0000000..76c425e
@@ -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 <[email protected]>
+ *
+ * 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_ */
Signature · 1 line
1.6.6.1