[MIPS] Add generic GPIO to Au1x00

This patch adds support for the generic GPIO API to Au1x00 boards. It requires
the generic GPIO patch for MIPS boards by Yoichi Yuasa. Now there is a MIPS
target using it, can you queue these patchset for 2.6.22 ? Thank you very
much in advance.
Signed-off-by: Florian Fainelli <florian.fainelli@telecomint.eu>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Kconfig

@@ -861,6 +861,7 @@ config SOC_PNX8550
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select GENERIC_HARDIRQS_NO__DO_IRQ
 	select SYS_SUPPORTS_KGDB
+	select GENERIC_GPIO
 
 config SWAP_IO_SPACE
 	bool

arch/mips/au1000/common/gpio.c

 /*
+ *  Copyright (C) 2007, OpenWrt.org, Florian Fainelli <florian@openwrt.org>
+ *  	Architecture specific GPIO support
+ *
  *  This program is free software; you can redistribute	 it and/or modify it
  *  under  the terms of	 the GNU General  Public License as published by the
  *  Free Software Foundation;  either version 2 of the	License, or (at your
@@ -18,101 +21,136 @@
  *  You should have received a copy of the  GNU General Public License along
  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  *  675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *  Notes :
+ * 	au1000 SoC have only one GPIO line : GPIO1
+ * 	others have a second one : GPIO2
  */
+
+#include <linux/autoconf.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/types.h>
 #include <linux/module.h>
-#include <au1000.h>
-#include <au1xxx_gpio.h>
+
+#include <asm/addrspace.h>
+
+#include <asm/mach-au1x00/au1000.h>
+#include <asm/gpio.h>
 
 #define gpio1 sys
 #if !defined(CONFIG_SOC_AU1000)
-static AU1X00_GPIO2 * const gpio2 = (AU1X00_GPIO2 *)GPIO2_BASE;
 
+static struct au1x00_gpio2 *const gpio2 = (struct au1x00_gpio2 *) GPIO2_BASE;
 #define GPIO2_OUTPUT_ENABLE_MASK 	0x00010000
 
-int au1xxx_gpio2_read(int signal)
+static int au1xxx_gpio2_read(unsigned gpio)
 {
-	signal -= 200;
-/*	gpio2->dir &= ~(0x01 << signal);						//Set GPIO to input */
-	return ((gpio2->pinstate >> signal) & 0x01);
+	gpio -= AU1XXX_GPIO_BASE;
+	return ((gpio2->pinstate >> gpio) & 0x01);
 }
 
-void au1xxx_gpio2_write(int signal, int value)
+static void au1xxx_gpio2_write(unsigned gpio, int value)
 {
-	signal -= 200;
+	gpio -= AU1XXX_GPIO_BASE;
+
+	gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << gpio) | (value << gpio);
+}
 
-	gpio2->output = (GPIO2_OUTPUT_ENABLE_MASK << signal) |
-		(value << signal);
+static int au1xxx_gpio2_direction_input(unsigned gpio)
+{
+	gpio -= AU1XXX_GPIO_BASE;
+	gpio2->dir &= ~(0x01 << gpio);
+	return 0;
 }
 
-void au1xxx_gpio2_tristate(int signal)
+static int au1xxx_gpio2_direction_output(unsigned gpio, int value)
 {
-	signal -= 200;
-	gpio2->dir &= ~(0x01 << signal); 	/* Set GPIO to input */
+	gpio -= AU1XXX_GPIO_BASE;
+	gpio2->dir = (0x01 << gpio) | (value << gpio);
+	return 0;
 }
-#endif
 
-int au1xxx_gpio1_read(int signal)
+#endif /* !defined(CONFIG_SOC_AU1000) */
+
+static int au1xxx_gpio1_read(unsigned gpio)
 {
-/*	gpio1->trioutclr |= (0x01 << signal); */
-	return ((gpio1->pinstaterd >> signal) & 0x01);
+	return ((gpio1->pinstaterd >> gpio) & 0x01);
 }
 
-void au1xxx_gpio1_write(int signal, int value)
+static void au1xxx_gpio1_write(unsigned gpio, int value)
 {
-	if(value)
-		gpio1->outputset = (0x01 << signal);
+	if (value)
+		gpio1->outputset = (0x01 << gpio);
 	else
-		gpio1->outputclr = (0x01 << signal);	/* Output a Zero */
+		/* Output a zero */
+		gpio1->outputclr = (0x01 << gpio);
 }
 
-void au1xxx_gpio1_tristate(int signal)
+static int au1xxx_gpio1_direction_input(unsigned gpio)
 {
-	gpio1->trioutclr = (0x01 << signal);		/* Tristate signal */
+	gpio1->pininputen = (0x01 << gpio);
+	return 0;
 }
 
+static int au1xxx_gpio1_direction_output(unsigned gpio, int value)
+{
+	gpio1->trioutclr = (0x01 & gpio);
+	return 0;
+}
 
-int au1xxx_gpio_read(int signal)
+int au1xxx_gpio_get_value(unsigned gpio)
 {
-	if(signal >= 200)
+	if (gpio >= AU1XXX_GPIO_BASE)
 #if defined(CONFIG_SOC_AU1000)
 		return 0;
 #else
-		return au1xxx_gpio2_read(signal);
+		return au1xxx_gpio2_read(gpio);
 #endif
 	else
-		return au1xxx_gpio1_read(signal);
+		return au1xxx_gpio1_read(gpio);
 }
 
-void au1xxx_gpio_write(int signal, int value)
+EXPORT_SYMBOL(au1xxx_gpio_get_value);
+
+void au1xxx_gpio_set_value(unsigned gpio, int value)
 {
-	if(signal >= 200)
+	if (gpio >= AU1XXX_GPIO_BASE)
 #if defined(CONFIG_SOC_AU1000)
 		;
 #else
-		au1xxx_gpio2_write(signal, value);
+		au1xxx_gpio2_write(gpio, value);
 #endif
 	else
-		au1xxx_gpio1_write(signal, value);
+		au1xxx_gpio1_write(gpio, value);
 }
 
-void au1xxx_gpio_tristate(int signal)
+EXPORT_SYMBOL(au1xxx_gpio_set_value);
+
+int au1xxx_gpio_direction_input(unsigned gpio)
 {
-	if(signal >= 200)
+	if (gpio >= AU1XXX_GPIO_BASE)
 #if defined(CONFIG_SOC_AU1000)
 		;
 #else
-		au1xxx_gpio2_tristate(signal);
+		return au1xxx_gpio2_direction_input(gpio);
 #endif
 	else
-		au1xxx_gpio1_tristate(signal);
+		return au1xxx_gpio1_direction_input(gpio);
 }
 
-void au1xxx_gpio1_set_inputs(void)
+EXPORT_SYMBOL(au1xxx_gpio_direction_input);
+
+int au1xxx_gpio_direction_output(unsigned gpio, int value)
 {
-	gpio1->pininputen = 0;
+	if (gpio >= AU1XXX_GPIO_BASE)
+#if defined(CONFIG_SOC_AU1000)
+		;
+#else
+		return au1xxx_gpio2_direction_output(gpio, value);
+#endif
+	else
+		return au1xxx_gpio1_direction_output(gpio, value);
 }
 
-EXPORT_SYMBOL(au1xxx_gpio1_set_inputs);
-EXPORT_SYMBOL(au1xxx_gpio_tristate);
-EXPORT_SYMBOL(au1xxx_gpio_write);
-EXPORT_SYMBOL(au1xxx_gpio_read);
+EXPORT_SYMBOL(au1xxx_gpio_direction_output);

include/asm-mips/mach-au1x00/au1xxx_gpio.h

-#ifndef __AU1XXX_GPIO_H
-#define __AU1XXX_GPIO_H
-
-void au1xxx_gpio1_set_inputs(void);
-void au1xxx_gpio_tristate(int signal);
-void au1xxx_gpio_write(int signal, int value);
-int  au1xxx_gpio_read(int signal);
-
-typedef volatile struct
-{
-	u32 dir;
-	u32 reserved;
-	u32 output;
-	u32 pinstate;
-	u32 inten;
-	u32 enable;
-
-} AU1X00_GPIO2;
-
-#endif //__AU1XXX_GPIO_H

include/asm-mips/mach-au1x00/gpio.h

+#ifndef _AU1XXX_GPIO_H_
+#define _AU1XXX_GPIO_H_
+
+#include <linux/types.h>
+
+#define AU1XXX_GPIO_BASE	200
+
+struct au1x00_gpio2 {
+	u32	dir;
+	u32	reserved;
+	u32	output;
+	u32	pinstate;
+	u32	inten;
+	u32	enable;
+};
+
+extern int au1xxx_gpio_get_value(unsigned gpio);
+extern void au1xxx_gpio_set_value(unsigned gpio, int value);
+extern int au1xxx_gpio_direction_input(unsigned gpio);
+extern int au1xxx_gpio_direction_output(unsigned gpio, int value);
+
+
+/* Wrappers for the arch-neutral GPIO API */
+
+static inline int gpio_request(unsigned gpio, const char *label)
+{
+	/* Not yet implemented */
+	return 0;
+}
+
+static inline void gpio_free(unsigned gpio)
+{
+	/* Not yet implemented */
+}
+
+static inline int gpio_direction_input(unsigned gpio)
+{
+	return au1xxx_gpio_direction_input(gpio);
+}
+
+static inline int gpio_direction_output(unsigned gpio, int value)
+{
+	return au1xxx_gpio_direction_output(gpio, value);
+}
+
+static inline int gpio_get_value(unsigned gpio)
+{
+	return au1xxx_gpio_get_value(gpio);
+}
+
+static inline void gpio_set_value(unsigned gpio, int value)
+{
+	au1xxx_gpio_set_value(gpio, value);
+}
+
+static inline int gpio_to_irq(unsigned gpio)
+{
+	return gpio;
+}
+
+static inline int irq_to_gpio(unsigned irq)
+{
+	return irq;
+}
+
+/* For cansleep */
+#include <asm-generic/gpio.h>
+
+#endif /* _AU1XXX_GPIO_H_ */