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Commit 000af2c5 authored by Johannes Weiner's avatar Johannes Weiner Committed by Chris Zankel
Browse files

xtensa: s6000 variant 



Support for the Stretch S6000 Xtensa core variant.

Signed-off-by: default avatarJohannes Weiner <jw@emlix.com>
Signed-off-by: default avatarOskar Schirmer <os@emlix.com>
Signed-off-by: default avatarChris Zankel <chris@zankel.net>
parent eff35af9

arch/xtensa/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -32,6 +32,9 @@ config GENERIC_HWEIGHT 
config GENERIC_HARDIRQS

	def_bool y



config GENERIC_GPIO

	def_bool y



config ARCH_HAS_ILOG2_U32

	def_bool n
@@ -69,6 +72,11 @@ config XTENSA_VARIANT_DC232B 
	select MMU

	help

	  This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).



config XTENSA_VARIANT_S6000

	bool "s6000 - Stretch software configurable processor"

	select VARIANT_IRQ_SWITCH

	select ARCH_REQUIRE_GPIOLIB

endchoice



config XTENSA_UNALIGNED_USER

arch/xtensa/Makefile

+1 −0
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@@ -15,6 +15,7 @@ 


variant-$(CONFIG_XTENSA_VARIANT_FSF)		:= fsf

variant-$(CONFIG_XTENSA_VARIANT_DC232B)		:= dc232b

variant-$(CONFIG_XTENSA_VARIANT_S6000)		:= s6000

variant-$(CONFIG_XTENSA_VARIANT_LINUX_CUSTOM)	:= custom



VARIANT = $(variant-y)

arch/xtensa/include/asm/gpio.h

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Original line number Diff line number Diff line 
/*

 * Generic GPIO API implementation for xtensa.

 *

 * Stolen from x86, which is derived from the generic GPIO API for powerpc:

 *

 * Copyright (c) 2007-2008  MontaVista Software, Inc.

 *

 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>

 *

 * 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 option) any later version.

 */



#ifndef _ASM_XTENSA_GPIO_H

#define _ASM_XTENSA_GPIO_H



#include <asm-generic/gpio.h>



#ifdef CONFIG_GPIOLIB



/*

 * Just call gpiolib.

 */

static inline int gpio_get_value(unsigned int gpio)

{

	return __gpio_get_value(gpio);

}



static inline void gpio_set_value(unsigned int gpio, int value)

{

	__gpio_set_value(gpio, value);

}



static inline int gpio_cansleep(unsigned int gpio)

{

	return __gpio_cansleep(gpio);

}



/*

 * Not implemented, yet.

 */

static inline int gpio_to_irq(unsigned int gpio)

{

	return -ENOSYS;

}



static inline int irq_to_gpio(unsigned int irq)

{

	return -EINVAL;

}



#endif /* CONFIG_GPIOLIB */



#endif /* _ASM_XTENSA_GPIO_H */

arch/xtensa/variants/s6000/Makefile

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# s6000 Makefile



obj-y		+= irq.o gpio.o

arch/xtensa/variants/s6000/gpio.c

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/*

 * s6000 gpio driver

 *

 * Copyright (c) 2009 emlix GmbH

 * Authors:	Oskar Schirmer <os@emlix.com>

 *		Johannes Weiner <jw@emlix.com>

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/io.h>

#include <linux/gpio.h>



#include <variant/hardware.h>



#define S6_GPIO_DATA		0x000

#define S6_GPIO_IS		0x404

#define S6_GPIO_IBE		0x408

#define S6_GPIO_IEV		0x40C

#define S6_GPIO_IE		0x410

#define S6_GPIO_RIS		0x414

#define S6_GPIO_MIS		0x418

#define S6_GPIO_IC		0x41C

#define S6_GPIO_AFSEL		0x420

#define S6_GPIO_DIR		0x800

#define S6_GPIO_BANK(nr)	((nr) * 0x1000)

#define S6_GPIO_MASK(nr)	(4 << (nr))

#define S6_GPIO_OFFSET(nr) \

		(S6_GPIO_BANK((nr) >> 3) + S6_GPIO_MASK((nr) & 7))



static int direction_input(struct gpio_chip *chip, unsigned int off)

{

	writeb(0, S6_REG_GPIO + S6_GPIO_DIR + S6_GPIO_OFFSET(off));

	return 0;

}



static int get(struct gpio_chip *chip, unsigned int off)

{

	return readb(S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off));

}



static int direction_output(struct gpio_chip *chip, unsigned int off, int val)

{

	unsigned rel = S6_GPIO_OFFSET(off);

	writeb(~0, S6_REG_GPIO + S6_GPIO_DIR + rel);

	writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + rel);

	return 0;

}



static void set(struct gpio_chip *chip, unsigned int off, int val)

{

	writeb(val ? ~0 : 0, S6_REG_GPIO + S6_GPIO_DATA + S6_GPIO_OFFSET(off));

}



static struct gpio_chip gpiochip = {

	.owner = THIS_MODULE,

	.direction_input = direction_input,

	.get = get,

	.direction_output = direction_output,

	.set = set,

	.base = 0,

	.ngpio = 24,

	.can_sleep = 0, /* no blocking io needed */

	.exported = 0, /* no exporting to userspace */

};



static int gpio_init(void)

{

	return gpiochip_add(&gpiochip);

}

device_initcall(gpio_init);