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/*
* gpio_cfi_flash.c - GPIO-assisted Flash Chip Support
*
* Copyright (c) 2009-2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <common.h>
#include <asm/blackfin.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include "gpio_cfi_flash.h"
/* Allow this driver to be shared among boards */
#ifndef GPIO_PIN_1
#define GPIO_PIN_1 GPIO_PF4
#endif
#define GPIO_MASK_1 (1 << 21)
#ifndef GPIO_PIN_2
#define GPIO_MASK_2 (0)
#else
#define GPIO_MASK_2 (1 << 22)
#endif
#define GPIO_MASK (GPIO_MASK_1 | GPIO_MASK_2)
void *gpio_cfi_flash_swizzle(void *vaddr)
{
unsigned long addr = (unsigned long)vaddr;
gpio_set_value(GPIO_PIN_1, addr & GPIO_MASK_1);
#ifdef GPIO_PIN_2
gpio_set_value(GPIO_PIN_2, addr & GPIO_MASK_2);
#endif
SSYNC();
udelay(1);
return (void *)(addr & ~GPIO_MASK);
}
#define __raw_writeq(value, addr) *(volatile u64 *)addr = value
#define __raw_readq(addr) *(volatile u64 *)addr
#define MAKE_FLASH(size, sfx) \
void flash_write##size(u##size value, void *addr) \
{ \
__raw_write##sfx(value, gpio_cfi_flash_swizzle(addr)); \
} \
u##size flash_read##size(void *addr) \
{ \
return __raw_read##sfx(gpio_cfi_flash_swizzle(addr)); \
}
MAKE_FLASH(8, b) /* flash_write8() flash_read8() */
MAKE_FLASH(16, w) /* flash_write16() flash_read16() */
MAKE_FLASH(32, l) /* flash_write32() flash_read32() */
MAKE_FLASH(64, q) /* flash_write64() flash_read64() */
void gpio_cfi_flash_init(void)
{
gpio_request(GPIO_PIN_1, "gpio_cfi_flash");
gpio_direction_output(GPIO_PIN_1, 0);
#ifdef GPIO_PIN_2
gpio_request(GPIO_PIN_2, "gpio_cfi_flash");
gpio_direction_output(GPIO_PIN_2, 0);
#endif
}
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