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Mike Frysinger59e4be92008-10-12 21:55:45 -04001/*
2 * gpio_cfi_flash.c - GPIO-assisted Flash Chip Support
3 *
4 * Copyright (c) 2009 Analog Devices Inc.
5 *
6 * Licensed under the GPL-2 or later.
7 */
8
9#include <common.h>
10#include <asm/blackfin.h>
11#include <asm/io.h>
12#include "gpio_cfi_flash.h"
13
14#define GPIO_PIN_1 PH9
15#define GPIO_MASK_1 (1 << 21)
16#define GPIO_PIN_2 PG11
17#define GPIO_MASK_2 (1 << 22)
18#define GPIO_MASK (GPIO_MASK_1 | GPIO_MASK_2)
19
20void *gpio_cfi_flash_swizzle(void *vaddr)
21{
22 unsigned long addr = (unsigned long)vaddr;
23
24 if (addr & GPIO_MASK_1)
25 bfin_write_PORTHIO_SET(GPIO_PIN_1);
26 else
27 bfin_write_PORTHIO_CLEAR(GPIO_PIN_1);
28
29#ifdef GPIO_MASK_2
30 if (addr & GPIO_MASK_2)
31 bfin_write_PORTGIO_SET(GPIO_PIN_2);
32 else
33 bfin_write_PORTGIO_CLEAR(GPIO_PIN_2);
34#endif
35
36 SSYNC();
37
38 return (void *)(addr & ~GPIO_MASK);
39}
40
41#define __raw_writeq(value, addr) *(volatile u64 *)addr = value
42#define __raw_readq(addr) *(volatile u64 *)addr
43
44#define MAKE_FLASH(size, sfx) \
45void flash_write##size(u##size value, void *addr) \
46{ \
47 __raw_write##sfx(value, gpio_cfi_flash_swizzle(addr)); \
48} \
49u##size flash_read##size(void *addr) \
50{ \
51 return __raw_read##sfx(gpio_cfi_flash_swizzle(addr)); \
52}
53MAKE_FLASH(8, b) /* flash_write8() flash_read8() */
54MAKE_FLASH(16, w) /* flash_write16() flash_write16() */
55MAKE_FLASH(32, l) /* flash_write32() flash_write32() */
56MAKE_FLASH(64, q) /* flash_write64() flash_write64() */
57
58void gpio_cfi_flash_init(void)
59{
60 bfin_write_PORTHIO_DIR(bfin_read_PORTHIO_DIR() | GPIO_PIN_1);
61 bfin_write_PORTGIO_DIR(bfin_read_PORTGIO_DIR() | GPIO_PIN_2);
62 gpio_cfi_flash_swizzle((void *)CONFIG_SYS_FLASH_BASE);
63}