| /* |
| * 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 |
| #ifndef GPIO_PIN_3 |
| #define GPIO_MASK_3 (0) |
| #else |
| #define GPIO_MASK_3 (1 << 23) |
| #endif |
| #define GPIO_MASK (GPIO_MASK_1 | GPIO_MASK_2 | GPIO_MASK_3) |
| |
| 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 |
| |
| #ifdef GPIO_PIN_3 |
| gpio_set_value(GPIO_PIN_3, addr & GPIO_MASK_3); |
| #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 |
| #ifdef GPIO_PIN_3 |
| gpio_request(GPIO_PIN_3, "gpio_cfi_flash"); |
| gpio_direction_output(GPIO_PIN_3, 0); |
| #endif |
| } |