board/cm-bf527/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/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
  20 void *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) \
  45 void flash_write##size(u##size value, void *addr) \
  46 { \
  47         __raw_write##sfx(value, gpio_cfi_flash_swizzle(addr)); \
  48 } \
  49 u##size flash_read##size(void *addr) \
  50 { \
  51         return __raw_read##sfx(gpio_cfi_flash_swizzle(addr)); \
  52 }
  53 MAKE_FLASH(8, b)  /* flash_write8()  flash_read8() */
  54 MAKE_FLASH(16, w) /* flash_write16() flash_read16() */
  55 MAKE_FLASH(32, l) /* flash_write32() flash_read32() */
  56 MAKE_FLASH(64, q) /* flash_write64() flash_read64() */
  57
  58 void 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 }