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https://github.com/AsahiLinux/u-boot
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63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/*
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* gpio_cfi_flash.c - GPIO-assisted Flash Chip Support
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*
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* Copyright (c) 2009 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#include <common.h>
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#include <asm/blackfin.h>
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#include <asm/io.h>
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#include "gpio_cfi_flash.h"
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#define GPIO_PIN_1 PH9
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#define GPIO_MASK_1 (1 << 21)
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#define GPIO_PIN_2 PG11
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#define GPIO_MASK_2 (1 << 22)
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#define GPIO_MASK (GPIO_MASK_1 | GPIO_MASK_2)
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void *gpio_cfi_flash_swizzle(void *vaddr)
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{
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unsigned long addr = (unsigned long)vaddr;
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if (addr & GPIO_MASK_1)
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bfin_write_PORTHIO_SET(GPIO_PIN_1);
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else
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bfin_write_PORTHIO_CLEAR(GPIO_PIN_1);
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#ifdef GPIO_MASK_2
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if (addr & GPIO_MASK_2)
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bfin_write_PORTGIO_SET(GPIO_PIN_2);
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else
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bfin_write_PORTGIO_CLEAR(GPIO_PIN_2);
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#endif
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SSYNC();
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return (void *)(addr & ~GPIO_MASK);
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}
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#define __raw_writeq(value, addr) *(volatile u64 *)addr = value
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#define __raw_readq(addr) *(volatile u64 *)addr
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#define MAKE_FLASH(size, sfx) \
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void flash_write##size(u##size value, void *addr) \
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{ \
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__raw_write##sfx(value, gpio_cfi_flash_swizzle(addr)); \
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} \
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u##size flash_read##size(void *addr) \
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{ \
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return __raw_read##sfx(gpio_cfi_flash_swizzle(addr)); \
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}
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MAKE_FLASH(8, b) /* flash_write8() flash_read8() */
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MAKE_FLASH(16, w) /* flash_write16() flash_read16() */
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MAKE_FLASH(32, l) /* flash_write32() flash_read32() */
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MAKE_FLASH(64, q) /* flash_write64() flash_read64() */
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void gpio_cfi_flash_init(void)
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{
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bfin_write_PORTHIO_DIR(bfin_read_PORTHIO_DIR() | GPIO_PIN_1);
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bfin_write_PORTGIO_DIR(bfin_read_PORTGIO_DIR() | GPIO_PIN_2);
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gpio_cfi_flash_swizzle((void *)CONFIG_SYS_FLASH_BASE);
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}
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