2 * 82802ab.c: driver for programming JEDEC standard flash parts
5 * Copyright 2000 Silicon Integrated System Corporation
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 * Reference: http://www.intel.com/design/chipsets/datashts/290658.htm
38 // I need that Berkeley bit-map printer
39 void print_82802ab_status(unsigned char status)
41 printf("%s", status & 0x80 ? "Ready:" : "Busy:");
42 printf("%s", status & 0x40 ? "BE SUSPEND:" : "BE RUN/FINISH:");
43 printf("%s", status & 0x20 ? "BE ERROR:" : "BE OK:");
44 printf("%s", status & 0x10 ? "PROG ERR:" : "PROG OK:");
45 printf("%s", status & 0x8 ? "VP ERR:" : "VPP OK:");
46 printf("%s", status & 0x4 ? "PROG SUSPEND:" : "PROG RUN/FINISH:");
47 printf("%s", status & 0x2 ? "WP|TBL#|WP#,ABORT:" : "UNLOCK:");
50 int probe_82802ab(struct flashchip *flash)
52 volatile unsigned char *bios = flash->virt_addr;
53 unsigned char id1, id2;
56 *(volatile unsigned char *) (bios + 0x5555) = 0xAA;
57 *(volatile unsigned char *) (bios + 0x2AAA) = 0x55;
58 *(volatile unsigned char *) (bios + 0x5555) = 0x90;
66 id1 = *(volatile unsigned char *) bios;
67 id2 = *(volatile unsigned char *) (bios + 0x01);
70 *(volatile unsigned char *) (bios + 0x5555) = 0xAA;
71 *(volatile unsigned char *) (bios + 0x2AAA) = 0x55;
72 *(volatile unsigned char *) (bios + 0x5555) = 0xF0;
77 printf("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
79 if (id1 == flash->manufacture_id && id2 == flash->model_id) {
80 size_t size = flash->total_size * 1024;
81 // we need to mmap the write-protect space.
82 bios = mmap(0, size, PROT_WRITE | PROT_READ, MAP_SHARED,
83 flash->fd_mem, (off_t) (0 - 0x400000 - size));
84 if (bios == MAP_FAILED) {
85 // it's this part but we can't map it ...
86 perror("Error MMAP /dev/mem");
90 flash->virt_addr_2 = bios;
97 unsigned char wait_82802ab(volatile unsigned char *bios)
100 unsigned char status;
101 unsigned char id1, id2;
104 if ((*bios & 0x80) == 0) { // it's busy
105 while ((*bios & 0x80) == 0);
110 // put another command to get out of status register mode
115 id1 = *(volatile unsigned char *) bios;
116 id2 = *(volatile unsigned char *) (bios + 0x01);
118 // this is needed to jam it out of "read id" mode
119 *(volatile unsigned char *) (bios + 0x5555) = 0xAA;
120 *(volatile unsigned char *) (bios + 0x2AAA) = 0x55;
121 *(volatile unsigned char *) (bios + 0x5555) = 0xF0;
125 int erase_82802ab_block(struct flashchip *flash, int offset)
127 volatile unsigned char *bios = flash->virt_addr + offset;
128 volatile unsigned char *wrprotect =
129 flash->virt_addr_2 + offset + 2;
130 unsigned char status;
132 // clear status register
134 //printf("Erase at %p\n", bios);
135 // clear write protect
136 //printf("write protect is at %p\n", (wrprotect));
137 //printf("write protect is 0x%x\n", *(wrprotect));
139 //printf("write protect is 0x%x\n", *(wrprotect));
142 *(volatile unsigned char *) (bios) = 0x20;
143 *(volatile unsigned char *) (bios) = 0xd0;
145 // now let's see what the register is
146 status = wait_82802ab(flash->virt_addr);
147 //print_82802ab_status(status);
148 printf("DONE BLOCK 0x%x\n", offset);
151 int erase_82802ab(struct flashchip *flash)
154 unsigned int total_size = flash->total_size * 1024;
156 printf("total_size is %d; flash->page_size is %d\n",
157 total_size, flash->page_size);
158 for (i = 0; i < total_size; i += flash->page_size)
159 erase_82802ab_block(flash, i);
160 printf("DONE ERASE\n");
164 void write_page_82802ab(volatile char *bios, char *src, volatile char *dst,
169 for (i = 0; i < page_size; i++) {
170 /* transfer data from source to destination */
178 int write_82802ab(struct flashchip *flash, unsigned char *buf)
181 int total_size = flash->total_size * 1024, page_size =
183 volatile unsigned char *bios = flash->virt_addr;
185 erase_82802ab(flash);
187 printf("ERASE FAILED\n");
190 printf("Programming Page: ");
191 for (i = 0; i < total_size / page_size; i++) {
192 printf("%04d at address: 0x%08x", i, i * page_size);
193 write_page_82802ab(bios, buf + i * page_size,
194 bios + i * page_size, page_size);
196 ("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
199 protect_82802ab(bios);