2 * am29f040.c: driver for programming AMD am29f040b models
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 * AMD Am29F040B data sheet
29 static __inline__ int erase_sector_29f040b(volatile uint8_t *bios,
30 unsigned long address)
32 *(bios + 0x555) = 0xAA;
33 *(bios + 0x2AA) = 0x55;
34 *(bios + 0x555) = 0x80;
35 *(bios + 0x555) = 0xAA;
36 *(bios + 0x2AA) = 0x55;
37 *(bios + address) = 0x30;
41 /* wait for Toggle bit ready */
42 toggle_ready_jedec(bios + address);
47 static __inline__ int write_sector_29f040b(volatile uint8_t *bios,
49 volatile uint8_t *dst,
50 unsigned int page_size)
54 for (i = 0; i < page_size; i++) {
55 if ((i & 0xfff) == 0xfff)
56 printf("0x%08lx", (unsigned long)dst -
59 *(bios + 0x555) = 0xAA;
60 *(bios + 0x2AA) = 0x55;
61 *(bios + 0x555) = 0xA0;
64 /* wait for Toggle bit ready */
65 toggle_ready_jedec(bios);
67 if ((i & 0xfff) == 0xfff)
68 printf("\b\b\b\b\b\b\b\b\b\b");
74 int probe_29f040b(struct flashchip *flash)
76 volatile uint8_t *bios = flash->virtual_memory;
79 *(bios + 0x555) = 0xAA;
80 *(bios + 0x2AA) = 0x55;
81 *(bios + 0x555) = 0x90;
90 printf_debug("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__, id1, id2);
91 if (id1 == flash->manufacture_id && id2 == flash->model_id)
97 int erase_29f040b(struct flashchip *flash)
99 volatile uint8_t *bios = flash->virtual_memory;
101 *(bios + 0x555) = 0xAA;
102 *(bios + 0x2AA) = 0x55;
103 *(bios + 0x555) = 0x80;
104 *(bios + 0x555) = 0xAA;
105 *(bios + 0x2AA) = 0x55;
106 *(bios + 0x555) = 0x10;
109 toggle_ready_jedec(bios);
114 int write_29f040b(struct flashchip *flash, uint8_t *buf)
117 int total_size = flash->total_size * 1024;
118 int page_size = flash->page_size;
119 volatile uint8_t *bios = flash->virtual_memory;
121 printf("Programming page ");
122 for (i = 0; i < total_size / page_size; i++) {
123 /* erase the page before programming */
124 erase_sector_29f040b(bios, i * page_size);
126 /* write to the sector */
127 printf("%04d at address: ", i);
128 write_sector_29f040b(bios, buf + i * page_size,
129 bios + i * page_size, page_size);
130 printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");