blob: db0cd693a997f8a05e5cad5cdc7d11ed83506b67 [file] [log] [blame]
Mike Frysinger65f6f072009-07-23 16:37:03 -04001/*
2 * atmel_df_pow2.c - convert Atmel Dataflashes to Power of 2 mode
3 *
4 * Copyright 2009 Analog Devices Inc.
5 *
6 * Licensed under the 2-clause BSD.
7 */
8
9#include <common.h>
10#include <exports.h>
11
12#define CMD_ID 0x9f
13#define CMD_STAT 0xd7
14#define CMD_CFG 0x3d
15
16static int flash_cmd(struct spi_slave *slave, uchar cmd, uchar *buf, int len)
17{
18 buf[0] = cmd;
19 return spi_xfer(slave, 8 * len, buf, buf, SPI_XFER_BEGIN | SPI_XFER_END);
20}
21
22static int flash_status(struct spi_slave *slave)
23{
24 uchar buf[2];
25 if (flash_cmd(slave, CMD_STAT, buf, sizeof(buf)))
26 return -1;
27 return buf[1];
28}
29
30static int flash_set_pow2(struct spi_slave *slave)
31{
32 int ret;
33 uchar buf[4];
34
35 buf[1] = 0x2a;
36 buf[2] = 0x80;
37 buf[3] = 0xa6;
38
39 ret = flash_cmd(slave, CMD_CFG, buf, sizeof(buf));
40 if (ret)
41 return ret;
42
43 /* wait Tp, or 6 msec */
44 udelay(6000);
45
46 ret = flash_status(slave);
47 if (ret == -1)
48 return 1;
49
50 return ret & 0x1 ? 0 : 1;
51}
52
53static int flash_check(struct spi_slave *slave)
54{
55 int ret;
56 uchar buf[4];
57
58 ret = flash_cmd(slave, CMD_ID, buf, sizeof(buf));
59 if (ret)
60 return ret;
61
62 if (buf[1] != 0x1F) {
63 printf("atmel flash not found (id[0] = %#x)\n", buf[1]);
64 return 1;
65 }
66
67 if ((buf[2] >> 5) != 0x1) {
68 printf("AT45 flash not found (id[0] = %#x)\n", buf[2]);
69 return 2;
70 }
71
72 return 0;
73}
74
75static char *getline(void)
76{
77 static char buffer[100];
78 char c;
79 size_t i;
80
81 i = 0;
82 while (1) {
83 buffer[i] = '\0';
84
85 c = getc();
86
87 switch (c) {
88 case '\r': /* Enter/Return key */
89 case '\n':
90 puts("\n");
91 return buffer;
92
93 case 0x03: /* ^C - break */
94 return NULL;
95
96 case 0x5F:
97 case 0x08: /* ^H - backspace */
98 case 0x7F: /* DEL - backspace */
99 if (i) {
100 puts("\b \b");
101 i--;
102 }
103 break;
104
105 default:
106 /* Ignore control characters */
107 if (c < 0x20)
108 break;
109 /* Queue up all other characters */
110 buffer[i++] = c;
111 printf("%c", c);
112 break;
113 }
114 }
115}
116
117int atmel_df_pow2(int argc, char *argv[])
118{
119 /* Print the ABI version */
120 app_startup(argv);
121 if (XF_VERSION != get_version()) {
122 printf("Expects ABI version %d\n", XF_VERSION);
123 printf("Actual U-Boot ABI version %lu\n", get_version());
124 printf("Can't run\n\n");
125 return 1;
126 }
127
128 spi_init();
129
130 while (1) {
131 struct spi_slave *slave;
132 char *line, *p;
133 int bus, cs, status;
134
135 puts("\nenter the [BUS:]CS of the SPI flash: ");
136 line = getline();
137
138 /* CTRL+C */
139 if (!line)
140 return 0;
141 if (line[0] == '\0')
142 continue;
143
144 bus = cs = simple_strtoul(line, &p, 10);
145 if (*p) {
146 if (*p == ':') {
147 ++p;
148 cs = simple_strtoul(p, &p, 10);
149 }
150 if (*p) {
151 puts("invalid format, please try again\n");
152 continue;
153 }
154 } else
155 bus = 0;
156
157 printf("\ngoing to work with dataflash at %i:%i\n", bus, cs);
158
159 /* use a low speed -- it'll work with all devices, and
160 * speed here doesn't really matter.
161 */
162 slave = spi_setup_slave(bus, cs, 1000, SPI_MODE_3);
163 if (!slave) {
164 puts("unable to setup slave\n");
165 continue;
166 }
167
168 if (spi_claim_bus(slave)) {
169 spi_free_slave(slave);
170 continue;
171 }
172
173 if (flash_check(slave)) {
174 puts("no flash found\n");
175 goto done;
176 }
177
178 status = flash_status(slave);
179 if (status == -1) {
180 puts("unable to read status register\n");
181 goto done;
182 }
183 if (status & 0x1) {
184 puts("flash is already in power-of-2 mode!\n");
185 goto done;
186 }
187
188 puts("are you sure you wish to set power-of-2 mode?\n");
189 puts("this operation is permanent and irreversible\n");
190 printf("enter YES to continue: ");
191 line = getline();
192 if (!line || strcmp(line, "YES"))
193 goto done;
194
195 if (flash_set_pow2(slave)) {
196 puts("setting pow2 mode failed\n");
197 goto done;
198 }
199
200 puts(
201 "Configuration should be updated now. You will have to\n"
202 "power cycle the part in order to finish the conversion.\n"
203 );
204
205 done:
206 spi_release_bus(slave);
207 spi_free_slave(slave);
208 }
209}