board/cm-bf537e/gpio_cfi_flash.c

   1 /*
   2  * gpio_cfi_flash.c - GPIO-assisted Flash Chip Support
   3  *
   4  * Copyright (c) 2009-2010 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 /* Allow this driver to be shared among boards */
  16 #ifndef GPIO_PIN_1
  17 #define GPIO_PIN_1  GPIO_PF4
  18 #endif
  19 #define GPIO_MASK_1 (1 << 21)
  20 #ifndef GPIO_PIN_2
  21 #define GPIO_MASK_2 (0)
  22 #else
  23 #define GPIO_MASK_2 (1 << 22)
  24 #endif
  25 #ifndef GPIO_PIN_3
  26 #define GPIO_MASK_3 (0)
  27 #else
  28 #define GPIO_MASK_3 (1 << 23)
  29 #endif
  30 #define GPIO_MASK   (GPIO_MASK_1 | GPIO_MASK_2 | GPIO_MASK_3)
  31
  32 void *gpio_cfi_flash_swizzle(void *vaddr)
  33 {
  34         unsigned long addr = (unsigned long)vaddr;
  35
  36         gpio_set_value(GPIO_PIN_1, addr & GPIO_MASK_1);
  37
  38 #ifdef GPIO_PIN_2
  39         gpio_set_value(GPIO_PIN_2, addr & GPIO_MASK_2);
  40 #endif
  41
  42 #ifdef GPIO_PIN_3
  43         gpio_set_value(GPIO_PIN_3, addr & GPIO_MASK_3);
  44 #endif
  45
  46         SSYNC();
  47         udelay(1);
  48
  49         return (void *)(addr & ~GPIO_MASK);
  50 }
  51
  52 #define __raw_writeq(value, addr) *(volatile u64 *)addr = value
  53 #define __raw_readq(addr) *(volatile u64 *)addr
  54
  55 #define MAKE_FLASH(size, sfx) \
  56 void flash_write##size(u##size value, void *addr) \
  57 { \
  58         __raw_write##sfx(value, gpio_cfi_flash_swizzle(addr)); \
  59 } \
  60 u##size flash_read##size(void *addr) \
  61 { \
  62         return __raw_read##sfx(gpio_cfi_flash_swizzle(addr)); \
  63 }
  64 MAKE_FLASH(8, b)  /* flash_write8()  flash_read8() */
  65 MAKE_FLASH(16, w) /* flash_write16() flash_read16() */
  66 MAKE_FLASH(32, l) /* flash_write32() flash_read32() */
  67 MAKE_FLASH(64, q) /* flash_write64() flash_read64() */
  68
  69 void gpio_cfi_flash_init(void)
  70 {
  71         gpio_request(GPIO_PIN_1, "gpio_cfi_flash");
  72         gpio_direction_output(GPIO_PIN_1, 0);
  73 #ifdef GPIO_PIN_2
  74         gpio_request(GPIO_PIN_2, "gpio_cfi_flash");
  75         gpio_direction_output(GPIO_PIN_2, 0);
  76 #endif
  77 #ifdef GPIO_PIN_3
  78         gpio_request(GPIO_PIN_3, "gpio_cfi_flash");
  79         gpio_direction_output(GPIO_PIN_3, 0);
  80 #endif
  81 }