ac12ecd27a
Right now we perform direct pointer manipulation without any abstraction to read from and write to memory mapped flash chips. That makes it impossible to drive any flasher which does not mmap the whole chip. Using helper functions readb() and writeb() allows a driver for external flash programmers like Paraflasher to replace readb and writeb with calls to its own chip access routines. This patch has the additional advantage of removing lots of unnecessary casts to volatile uint8_t * and now-superfluous parentheses which caused poor readability. I used the semantic patcher Coccinelle to create this patch. The semantic patch follows: @@ expression a; typedef uint8_t; volatile uint8_t *b; @@ - *(b) = (a); + writeb(a, b); @@ volatile uint8_t *b; @@ - *(b) + readb(b) @@ type T; T b; @@ ( readb | writeb ) (..., - (T) - (b) + b ) In contrast to a sed script, the semantic patch performs type checking before converting anything. Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> Acked-by: FENG Yu Ning <fengyuning1984@gmail.com> Tested-by: Joe Julian git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3971 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
/*
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* This file is part of flashrom.
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*
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* Copyright (C) 2009 Peter Stuge <peter@stuge.se>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "flash.h"
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int erase_m29f002(struct flashchip *flash) {
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volatile uint8_t *bios = flash->virtual_memory;
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writeb(0xaa, bios + 0x555);
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writeb(0x55, bios + 0xaaa);
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writeb(0x80, bios + 0x555);
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writeb(0xaa, bios + 0x555);
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writeb(0x55, bios + 0xaaa);
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writeb(0x10, bios + 0x555);
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myusec_delay(10);
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toggle_ready_jedec(bios);
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return 0;
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}
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static void rewrite_block(volatile uint8_t *bios, uint8_t *src, volatile uint8_t *dst, int size) {
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/* erase */
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writeb(0xaa, bios + 0x555);
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writeb(0x55, bios + 0xaaa);
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writeb(0x80, bios + 0x555);
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writeb(0xaa, bios + 0x555);
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writeb(0x55, bios + 0xaaa);
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writeb(0x30, dst);
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myusec_delay(10);
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toggle_ready_jedec(bios);
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/* program */
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while (size--) {
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writeb(0xaa, bios + 0x555);
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writeb(0x55, bios + 0xaaa);
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writeb(0xa0, bios + 0x555);
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writeb(*src, dst);
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toggle_ready_jedec(dst);
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dst++;
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src++;
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}
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}
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static void do_block(volatile uint8_t *bios, uint8_t *src, int i, unsigned long start, int size) {
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printf("%d at address: 0x%08lx", i, start);
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rewrite_block(bios, src + start, bios + start, size);
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printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
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}
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int write_m29f002t(struct flashchip *flash, uint8_t *buf) {
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int i, page_size = flash->page_size;
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volatile uint8_t *bios = flash->virtual_memory;
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/* M29F002(N)T has 7 blocks. From bottom to top their sizes are:
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* 64k 64k 64k 32k 8k 8k 16k
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* flash->page_size is set to 64k in flashchips.c
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*/
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printf("Programming block: ");
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for (i = 0; i < 3; i++)
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do_block(bios, buf, i, i*page_size, page_size);
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do_block(bios, buf, i++, 0x30000, 32*1024);
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do_block(bios, buf, i++, 0x38000, 8*1024);
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do_block(bios, buf, i++, 0x3a000, 8*1024);
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do_block(bios, buf, i, 0x3c000, 16*1024);
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printf("\n");
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return 0;
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}
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int write_m29f002b(struct flashchip *flash, uint8_t *buf) {
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int i = 0, page_size = flash->page_size;
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volatile uint8_t *bios = flash->virtual_memory;
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/* M29F002B has 7 blocks. From bottom to top their sizes are:
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* 16k 8k 8k 32k 64k 64k 64k
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* flash->page_size is set to 64k in flashchips.c
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*/
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printf("Programming block: ");
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do_block(bios, buf, i++, 0x00000, 16*1024);
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do_block(bios, buf, i++, 0x04000, 8*1024);
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do_block(bios, buf, i++, 0x06000, 8*1024);
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do_block(bios, buf, i++, 0x08000, 32*1024);
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for (; i < 7; i++)
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do_block(bios, buf, i, (i-3)*page_size, page_size);
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printf("\n");
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return 0;
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}
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