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Commit a8e19667 authored by Lennert Buytenhek's avatar Lennert Buytenhek Committed by Russell King
Browse files

[ARM] 3371/1: ep93xx: gpio support 



Patch from Lennert Buytenhek

Add support for setting the direction of and getting/setting the
value of the 64 GPIO lines.

Signed-off-by: default avatarLennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent e7736d47

arch/arm/mach-ep93xx/core.c

+68 −0
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ 
#include <asm/mach/map.h>

#include <asm/mach/time.h>

#include <asm/mach/irq.h>

#include <asm/arch/gpio.h>



#include <asm/hardware/vic.h>
@@ -146,6 +147,73 @@ struct sys_timer ep93xx_timer = { 
};





/*************************************************************************

 * GPIO handling for EP93xx

 *************************************************************************/

static unsigned char data_register_offset[8] = {

	0x00, 0x04, 0x08, 0x0c, 0x20, 0x30, 0x38, 0x40,

};



static unsigned char data_direction_register_offset[8] = {

	0x10, 0x14, 0x18, 0x1c, 0x24, 0x34, 0x3c, 0x44,

};



void gpio_line_config(int line, int direction)

{

	unsigned int data_direction_register;

	unsigned long flags;

	unsigned char v;



	data_direction_register =

		EP93XX_GPIO_REG(data_direction_register_offset[line >> 3]);



	local_irq_save(flags);

	if (direction == GPIO_OUT) {

		v = __raw_readb(data_direction_register);

		v |= 1 << (line & 7);

		__raw_writeb(v, data_direction_register);

	} else if (direction == GPIO_IN) {

		v = __raw_readb(data_direction_register);

		v &= ~(1 << (line & 7));

		__raw_writeb(v, data_direction_register);

	}

	local_irq_restore(flags);

}

EXPORT_SYMBOL(gpio_line_config);



int gpio_line_get(int line)

{

	unsigned int data_register;



	data_register = EP93XX_GPIO_REG(data_register_offset[line >> 3]);



	return !!(__raw_readb(data_register) & (1 << (line & 7)));

}

EXPORT_SYMBOL(gpio_line_get);



void gpio_line_set(int line, int value)

{

	unsigned int data_register;

	unsigned long flags;

	unsigned char v;



	data_register = EP93XX_GPIO_REG(data_register_offset[line >> 3]);



	local_irq_save(flags);

	if (value == EP93XX_GPIO_HIGH) {

		v = __raw_readb(data_register);

		v |= 1 << (line & 7);

		__raw_writeb(v, data_register);

	} else if (value == EP93XX_GPIO_LOW) {

		v = __raw_readb(data_register);

		v &= ~(1 << (line & 7));

		__raw_writeb(v, data_register);

	}

	local_irq_restore(flags);

}

EXPORT_SYMBOL(gpio_line_set);





/*************************************************************************

 * EP93xx IRQ handling

 *************************************************************************/

include/asm-arm/arch-ep93xx/ep93xx-regs.h

+1 −0
Original line number Diff line number Diff line
@@ -71,6 +71,7 @@ 
#define EP93XX_SECURITY_BASE		(EP93XX_APB_VIRT_BASE + 0x00030000)



#define EP93XX_GPIO_BASE		(EP93XX_APB_VIRT_BASE + 0x00040000)

#define EP93XX_GPIO_REG(x)		(EP93XX_GPIO_BASE + (x))



#define EP93XX_AAC_BASE			(EP93XX_APB_VIRT_BASE + 0x00080000)

include/asm-arm/arch-ep93xx/gpio.h

0 → 100644
+107 −0
Original line number Diff line number Diff line 
/*

 * linux/include/asm-arm/arch-ep93xx/gpio.h

 */



#ifndef __ASM_ARCH_GPIO_H

#define __ASM_ARCH_GPIO_H



#define GPIO_IN				0

#define GPIO_OUT			1



#define EP93XX_GPIO_LOW			0

#define EP93XX_GPIO_HIGH		1



extern void gpio_line_config(int line, int direction);

extern int  gpio_line_get(int line);

extern void gpio_line_set(int line, int value);



/* GPIO port A.  */

#define EP93XX_GPIO_LINE_A(x)		((x) + 0)

#define EP93XX_GPIO_LINE_EGPIO0		EP93XX_GPIO_LINE_A(0)

#define EP93XX_GPIO_LINE_EGPIO1		EP93XX_GPIO_LINE_A(1)

#define EP93XX_GPIO_LINE_EGPIO2		EP93XX_GPIO_LINE_A(2)

#define EP93XX_GPIO_LINE_EGPIO3		EP93XX_GPIO_LINE_A(3)

#define EP93XX_GPIO_LINE_EGPIO4		EP93XX_GPIO_LINE_A(4)

#define EP93XX_GPIO_LINE_EGPIO5		EP93XX_GPIO_LINE_A(5)

#define EP93XX_GPIO_LINE_EGPIO6		EP93XX_GPIO_LINE_A(6)

#define EP93XX_GPIO_LINE_EGPIO7		EP93XX_GPIO_LINE_A(7)



/* GPIO port B.  */

#define EP93XX_GPIO_LINE_B(x)		((x) + 8)

#define EP93XX_GPIO_LINE_EGPIO8		EP93XX_GPIO_LINE_B(0)

#define EP93XX_GPIO_LINE_EGPIO9		EP93XX_GPIO_LINE_B(1)

#define EP93XX_GPIO_LINE_EGPIO10	EP93XX_GPIO_LINE_B(2)

#define EP93XX_GPIO_LINE_EGPIO11	EP93XX_GPIO_LINE_B(3)

#define EP93XX_GPIO_LINE_EGPIO12	EP93XX_GPIO_LINE_B(4)

#define EP93XX_GPIO_LINE_EGPIO13	EP93XX_GPIO_LINE_B(5)

#define EP93XX_GPIO_LINE_EGPIO14	EP93XX_GPIO_LINE_B(6)

#define EP93XX_GPIO_LINE_EGPIO15	EP93XX_GPIO_LINE_B(7)



/* GPIO port C.  */

#define EP93XX_GPIO_LINE_C(x)		((x) + 16)

#define EP93XX_GPIO_LINE_ROW0		EP93XX_GPIO_LINE_C(0)

#define EP93XX_GPIO_LINE_ROW1		EP93XX_GPIO_LINE_C(1)

#define EP93XX_GPIO_LINE_ROW2		EP93XX_GPIO_LINE_C(2)

#define EP93XX_GPIO_LINE_ROW3		EP93XX_GPIO_LINE_C(3)

#define EP93XX_GPIO_LINE_ROW4		EP93XX_GPIO_LINE_C(4)

#define EP93XX_GPIO_LINE_ROW5		EP93XX_GPIO_LINE_C(5)

#define EP93XX_GPIO_LINE_ROW6		EP93XX_GPIO_LINE_C(6)

#define EP93XX_GPIO_LINE_ROW7		EP93XX_GPIO_LINE_C(7)



/* GPIO port D.  */

#define EP93XX_GPIO_LINE_D(x)		((x) + 24)

#define EP93XX_GPIO_LINE_COL0		EP93XX_GPIO_LINE_D(0)

#define EP93XX_GPIO_LINE_COL1		EP93XX_GPIO_LINE_D(1)

#define EP93XX_GPIO_LINE_COL2		EP93XX_GPIO_LINE_D(2)

#define EP93XX_GPIO_LINE_COL3		EP93XX_GPIO_LINE_D(3)

#define EP93XX_GPIO_LINE_COL4		EP93XX_GPIO_LINE_D(4)

#define EP93XX_GPIO_LINE_COL5		EP93XX_GPIO_LINE_D(5)

#define EP93XX_GPIO_LINE_COL6		EP93XX_GPIO_LINE_D(6)

#define EP93XX_GPIO_LINE_COL7		EP93XX_GPIO_LINE_D(7)



/* GPIO port E.  */

#define EP93XX_GPIO_LINE_E(x)		((x) + 32)

#define EP93XX_GPIO_LINE_GRLED		EP93XX_GPIO_LINE_E(0)

#define EP93XX_GPIO_LINE_RDLED		EP93XX_GPIO_LINE_E(1)

#define EP93XX_GPIO_LINE_DIORn		EP93XX_GPIO_LINE_E(2)

#define EP93XX_GPIO_LINE_IDECS1n	EP93XX_GPIO_LINE_E(3)

#define EP93XX_GPIO_LINE_IDECS2n	EP93XX_GPIO_LINE_E(4)

#define EP93XX_GPIO_LINE_IDEDA0		EP93XX_GPIO_LINE_E(5)

#define EP93XX_GPIO_LINE_IDEDA1		EP93XX_GPIO_LINE_E(6)

#define EP93XX_GPIO_LINE_IDEDA2		EP93XX_GPIO_LINE_E(7)



/* GPIO port F.  */

#define EP93XX_GPIO_LINE_F(x)		((x) + 40)

#define EP93XX_GPIO_LINE_WP		EP93XX_GPIO_LINE_F(0)

#define EP93XX_GPIO_LINE_MCCD1		EP93XX_GPIO_LINE_F(1)

#define EP93XX_GPIO_LINE_MCCD2		EP93XX_GPIO_LINE_F(2)

#define EP93XX_GPIO_LINE_MCBVD1		EP93XX_GPIO_LINE_F(3)

#define EP93XX_GPIO_LINE_MCBVD2		EP93XX_GPIO_LINE_F(4)

#define EP93XX_GPIO_LINE_VS1		EP93XX_GPIO_LINE_F(5)

#define EP93XX_GPIO_LINE_READY		EP93XX_GPIO_LINE_F(6)

#define EP93XX_GPIO_LINE_VS2		EP93XX_GPIO_LINE_F(7)



/* GPIO port G.  */

#define EP93XX_GPIO_LINE_G(x)		((x) + 48)

#define EP93XX_GPIO_LINE_EECLK		EP93XX_GPIO_LINE_G(0)

#define EP93XX_GPIO_LINE_EEDAT		EP93XX_GPIO_LINE_G(1)

#define EP93XX_GPIO_LINE_SLA0		EP93XX_GPIO_LINE_G(2)

#define EP93XX_GPIO_LINE_SLA1		EP93XX_GPIO_LINE_G(3)

#define EP93XX_GPIO_LINE_DD12		EP93XX_GPIO_LINE_G(4)

#define EP93XX_GPIO_LINE_DD13		EP93XX_GPIO_LINE_G(5)

#define EP93XX_GPIO_LINE_DD14		EP93XX_GPIO_LINE_G(6)

#define EP93XX_GPIO_LINE_DD15		EP93XX_GPIO_LINE_G(7)



/* GPIO port H.  */

#define EP93XX_GPIO_LINE_H(x)		((x) + 56)

#define EP93XX_GPIO_LINE_DD0		EP93XX_GPIO_LINE_H(0)

#define EP93XX_GPIO_LINE_DD1		EP93XX_GPIO_LINE_H(1)

#define EP93XX_GPIO_LINE_DD2		EP93XX_GPIO_LINE_H(2)

#define EP93XX_GPIO_LINE_DD3		EP93XX_GPIO_LINE_H(3)

#define EP93XX_GPIO_LINE_DD4		EP93XX_GPIO_LINE_H(4)

#define EP93XX_GPIO_LINE_DD5		EP93XX_GPIO_LINE_H(5)

#define EP93XX_GPIO_LINE_DD6		EP93XX_GPIO_LINE_H(6)

#define EP93XX_GPIO_LINE_DD7		EP93XX_GPIO_LINE_H(7)





#endif