board/tcm-bf537/gpio_cfi_flash.c

   1 /*
   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/gpio.h>
  12 #include <asm/io.h>
  13 #include "gpio_cfi_flash.h"
  14
  15 #define GPIO_PIN_1  GPIO_PF4
  16 #define GPIO_MASK_1 (1 << 21)
  17 #define GPIO_PIN_2  GPIO_PF5
  18 #define GPIO_MASK_2 (1 << 22)
  19 #define GPIO_MASK   (GPIO_MASK_1 | GPIO_MASK_2)
  20
  21 void *gpio_cfi_flash_swizzle(void *vaddr)
  22 {
  23         unsigned long addr = (unsigned long)vaddr;
  24
  25         gpio_set_value(GPIO_PIN_1, addr & GPIO_MASK_1);
  26
  27 #ifdef GPIO_MASK_2
  28         gpio_set_value(GPIO_PIN_2, addr & GPIO_MASK_2);
  29 #endif
  30
  31         SSYNC();
  32
  33         return (void *)(addr & ~GPIO_MASK);
  34 }
  35
  36 #define __raw_writeq(value, addr) *(volatile u64 *)addr = value
  37 #define __raw_readq(addr) *(volatile u64 *)addr
  38
  39 #define MAKE_FLASH(size, sfx) \
  40 void flash_write##size(u##size value, void *addr) \
  41 { \
  42         __raw_write##sfx(value, gpio_cfi_flash_swizzle(addr)); \
  43 } \
  44 u##size flash_read##size(void *addr) \
  45 { \
  46         return __raw_read##sfx(gpio_cfi_flash_swizzle(addr)); \
  47 }
  48 MAKE_FLASH(8, b)  /* flash_write8()  flash_read8() */
  49 MAKE_FLASH(16, w) /* flash_write16() flash_read16() */
  50 MAKE_FLASH(32, l) /* flash_write32() flash_read32() */
  51 MAKE_FLASH(64, q) /* flash_write64() flash_read64() */
  52
  53 void gpio_cfi_flash_init(void)
  54 {
  55         gpio_request(GPIO_PIN_1, "gpio_cfi_flash");
  56 #ifdef GPIO_MASK_2
  57         gpio_request(GPIO_PIN_2, "gpio_cfi_flash");
  58 #endif
  59         gpio_cfi_flash_swizzle((void *)CONFIG_SYS_FLASH_BASE);
  60 }