| Andrew Ip | f0126ce | 2002-10-16 06:58:05 +0000 | [diff] [blame] | 1 | /* |
| 2 | * w49f002u.c: driver for Winbond 49F002U flash models |
| 3 | * |
| 4 | * |
| 5 | * Copyright 2000 Silicon Integrated System Corporation |
| 6 | * |
| 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. |
| 11 | * |
| 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. |
| 16 | * |
| 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. |
| 20 | * |
| 21 | * |
| 22 | * Reference: |
| 23 | * W49F002U data sheet |
| 24 | * |
| 25 | * $Id |
| 26 | */ |
| 27 | |
| 28 | #include "flash.h" |
| 29 | #include "jedec.h" |
| 30 | |
| 31 | int probe_49f002 (struct flashchip * flash) |
| 32 | { |
| 33 | volatile char * bios = flash->virt_addr; |
| 34 | unsigned char id1, id2, id3; |
| 35 | |
| 36 | *(bios + 0x5555) = 0xAA; |
| 37 | *(bios + 0x2AAA) = 0x55; |
| 38 | *(bios + 0x5555) = 0x90; |
| 39 | |
| 40 | id1 = *(volatile unsigned char *) bios; |
| 41 | id2 = *(volatile unsigned char *) (bios + 0x01); |
| 42 | |
| 43 | *bios = 0xF0; |
| 44 | |
| 45 | myusec_delay(10); |
| 46 | |
| 47 | printf(__FUNCTION__ "id1 %d, id2 %d\n", id1, id2); |
| 48 | if (id1 == flash->manufacture_id && id2 == flash->model_id) |
| 49 | return 1; |
| 50 | |
| 51 | return 0; |
| 52 | } |
| 53 | |
| 54 | int erase_49f002 (struct flashchip * flash) |
| 55 | { |
| 56 | volatile char * bios = flash->virt_addr; |
| 57 | |
| 58 | again: |
| 59 | *(bios + 0x5555) = 0xAA; |
| 60 | *(bios + 0x2AAA) = 0x55; |
| 61 | *(bios + 0x5555) = 0x80; |
| 62 | *(bios + 0x5555) = 0xAA; |
| 63 | *(bios + 0x2AAA) = 0x55; |
| 64 | *(bios + 0x5555) = 0x10; |
| 65 | |
| 66 | myusec_delay(100); |
| 67 | toggle_ready_jedec(bios); |
| 68 | |
| 69 | // while ((*bios & 0x40) != 0x40) |
| 70 | //; |
| 71 | |
| 72 | #if 0 |
| 73 | toggle_ready_jedec(bios); |
| 74 | *(bios + 0x0ffff) = 0x30; |
| 75 | *(bios + 0x1ffff) = 0x30; |
| 76 | *(bios + 0x2ffff) = 0x30; |
| 77 | *(bios + 0x37fff) = 0x30; |
| 78 | *(bios + 0x39fff) = 0x30; |
| 79 | *(bios + 0x3bfff) = 0x30; |
| 80 | #endif |
| 81 | |
| 82 | } |
| 83 | |
| 84 | int write_49f002 (struct flashchip * flash, char * buf) |
| 85 | { |
| 86 | int i; |
| 87 | int total_size = flash->total_size * 1024, page_size = flash->page_size; |
| 88 | volatile char * bios = flash->virt_addr; |
| 89 | volatile char * dst = bios, * src = buf; |
| 90 | |
| 91 | *bios = 0xF0; |
| 92 | myusec_delay(10); |
| 93 | erase_49f002(flash); |
| 94 | //*bios = 0xF0; |
| 95 | #if 1 |
| 96 | printf ("Programming Page: "); |
| 97 | for (i = 0; i < total_size; i++) { |
| 98 | /* write to the sector */ |
| 99 | printf ("address: 0x%08lx", i); |
| 100 | *(bios + 0x5555) = 0xAA; |
| 101 | *(bios + 0x2AAA) = 0x55; |
| 102 | *(bios + 0x5555) = 0xA0; |
| 103 | *dst++ = *buf++; |
| 104 | |
| 105 | /* wait for Toggle bit ready */ |
| 106 | toggle_ready_jedec(dst); |
| 107 | |
| 108 | printf ("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b"); |
| 109 | } |
| 110 | #endif |
| 111 | printf("\n"); |
| 112 | } |