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Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +00001/*
2 * sst28sf040.c: driver for SST28SF040C 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 * 4 MEgabit (512K x 8) SuperFlash EEPROM, SST28SF040 data sheet
24 *
25 * $Id$
26 */
27
Ronald G. Minnicheaab50b2003-09-12 22:41:53 +000028#include <stdio.h>
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +000029#include "flash.h"
30#include "jedec.h"
31
32#define AUTO_PG_ERASE1 0x20
33#define AUTO_PG_ERASE2 0xD0
34#define AUTO_PGRM 0x10
35#define CHIP_ERASE 0x30
36#define RESET 0xFF
37#define READ_ID 0x90
38
Ronald G. Minnichef5779d2002-01-29 20:18:02 +000039static __inline__ void protect_28sf040 (volatile char * bios)
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +000040{
41 /* ask compiler not to optimize this */
42 volatile unsigned char tmp;
43
Ronald G. Minnichef5779d2002-01-29 20:18:02 +000044 tmp = *(volatile unsigned char *) (bios + 0x1823);
45 tmp = *(volatile unsigned char *) (bios + 0x1820);
46 tmp = *(volatile unsigned char *) (bios + 0x1822);
47 tmp = *(volatile unsigned char *) (bios + 0x0418);
48 tmp = *(volatile unsigned char *) (bios + 0x041B);
49 tmp = *(volatile unsigned char *) (bios + 0x0419);
50 tmp = *(volatile unsigned char *) (bios + 0x040A);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +000051}
52
Ronald G. Minnichef5779d2002-01-29 20:18:02 +000053static __inline__ void unprotect_28sf040 (volatile char * bios)
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +000054{
55 /* ask compiler not to optimize this */
56 volatile unsigned char tmp;
57
Ronald G. Minnichef5779d2002-01-29 20:18:02 +000058 tmp = *(volatile unsigned char *) (bios + 0x1823);
59 tmp = *(volatile unsigned char *) (bios + 0x1820);
60 tmp = *(volatile unsigned char *) (bios + 0x1822);
61 tmp = *(volatile unsigned char *) (bios + 0x0418);
62 tmp = *(volatile unsigned char *) (bios + 0x041B);
63 tmp = *(volatile unsigned char *) (bios + 0x0419);
64 tmp = *(volatile unsigned char *) (bios + 0x041A);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +000065}
66
Ronald G. Minnicheaab50b2003-09-12 22:41:53 +000067static __inline__ int erase_sector_28sf040 (volatile char * bios, unsigned long address)
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +000068{
69 *bios = AUTO_PG_ERASE1;
70 *(bios + address) = AUTO_PG_ERASE2;
71
72 /* wait for Toggle bit ready */
73 toggle_ready_jedec(bios);
Ronald G. Minnicheaab50b2003-09-12 22:41:53 +000074
75 return(0);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +000076}
77
Ronald G. Minnicheaab50b2003-09-12 22:41:53 +000078static __inline__ int write_sector_28sf040(volatile char * bios, unsigned char * src,
Ronald G. Minnichef5779d2002-01-29 20:18:02 +000079 volatile unsigned char * dst, unsigned int page_size)
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +000080{
81 int i;
82
83 for (i = 0; i < page_size; i++) {
84 /* transfer data from source to destination */
85 if (*src == 0xFF) {
86 dst++, src++;
87 /* If the data is 0xFF, don't program it */
88 continue;
89 }
90 /*issue AUTO PROGRAM command */
91 *dst = AUTO_PGRM;
92 *dst++ = *src++;
93
94 /* wait for Toggle bit ready */
95 toggle_ready_jedec(bios);
96 }
Ronald G. Minnicheaab50b2003-09-12 22:41:53 +000097
98 return(0);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +000099}
100
101int probe_28sf040 (struct flashchip * flash)
102{
Ronald G. Minnichef5779d2002-01-29 20:18:02 +0000103 volatile char * bios = flash->virt_addr;
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000104 unsigned char id1, id2, tmp;
105
106 /* save the value at the beginning of the Flash */
107 tmp = *bios;
108
109 *bios = RESET;
Ronald G. Minnichef5779d2002-01-29 20:18:02 +0000110 myusec_delay(10);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000111
112 *bios = READ_ID;
Ronald G. Minnichef5779d2002-01-29 20:18:02 +0000113 myusec_delay(10);
114 id1 = *(volatile unsigned char *) bios;
115 myusec_delay(10);
116 id2 = *(volatile unsigned char *) (bios + 0x01);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000117
118 *bios = RESET;
Ronald G. Minnichef5779d2002-01-29 20:18:02 +0000119 myusec_delay(10);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000120
Ronald G. Minnichd4228fd2003-02-28 17:21:38 +0000121 printf("%s: id1 0x%x, id2 0x%x\n", __FUNCTION__ , id1, id2);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000122 if (id1 == flash->manufacture_id && id2 == flash->model_id)
123 return 1;
124
125 /* if there is no SST28SF040, restore the original value */
126 *bios = tmp;
127 return 0;
128}
129
130int erase_28sf040 (struct flashchip * flash)
131{
Ronald G. Minnichef5779d2002-01-29 20:18:02 +0000132 volatile char * bios = flash->virt_addr;
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000133
134 unprotect_28sf040 (bios);
135 *bios = CHIP_ERASE;
136 *bios = CHIP_ERASE;
137 protect_28sf040 (bios);
138
Ronald G. Minnichef5779d2002-01-29 20:18:02 +0000139 myusec_delay(10);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000140 toggle_ready_jedec(bios);
Ronald G. Minnicheaab50b2003-09-12 22:41:53 +0000141
142 return(0);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000143}
144
Ronald G. Minnicheaab50b2003-09-12 22:41:53 +0000145int write_28sf040 (struct flashchip * flash, unsigned char * buf)
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000146{
147 int i;
148 int total_size = flash->total_size * 1024, page_size = flash->page_size;
Ronald G. Minnichef5779d2002-01-29 20:18:02 +0000149 volatile char * bios = flash->virt_addr;
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000150
151 unprotect_28sf040 (bios);
152
153 printf ("Programming Page: ");
154 for (i = 0; i < total_size/page_size; i++) {
155 /* erase the page before programming */
156 erase_sector_28sf040(bios, i * page_size);
157
158 /* write to the sector */
159 printf ("%04d at address: 0x%08x", i, i * page_size);
160 write_sector_28sf040(bios, buf + i * page_size, bios + i * page_size,
161 page_size);
162 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\b\b\b");
163 }
164 printf("\n");
165
166 protect_28sf040 (bios);
Ronald G. Minnicheaab50b2003-09-12 22:41:53 +0000167
168 return(0);
Ronald G. Minnich5e5f75e2002-01-29 18:21:41 +0000169}