blob: 2e14aba390e62d0974330c16069792f52f769568 [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>
Mike Partington0910d0b2010-10-27 10:31:09 +000011#include <spi.h>
Mike Frysinger65f6f072009-07-23 16:37:03 -040012
13#define CMD_ID 0x9f
14#define CMD_STAT 0xd7
15#define CMD_CFG 0x3d
16
17static int flash_cmd(struct spi_slave *slave, uchar cmd, uchar *buf, int len)
18{
19 buf[0] = cmd;
20 return spi_xfer(slave, 8 * len, buf, buf, SPI_XFER_BEGIN | SPI_XFER_END);
21}
22
23static int flash_status(struct spi_slave *slave)
24{
25 uchar buf[2];
26 if (flash_cmd(slave, CMD_STAT, buf, sizeof(buf)))
27 return -1;
28 return buf[1];
29}
30
31static int flash_set_pow2(struct spi_slave *slave)
32{
33 int ret;
34 uchar buf[4];
35
36 buf[1] = 0x2a;
37 buf[2] = 0x80;
38 buf[3] = 0xa6;
39
40 ret = flash_cmd(slave, CMD_CFG, buf, sizeof(buf));
41 if (ret)
42 return ret;
43
44 /* wait Tp, or 6 msec */
45 udelay(6000);
46
47 ret = flash_status(slave);
48 if (ret == -1)
49 return 1;
50
51 return ret & 0x1 ? 0 : 1;
52}
53
54static int flash_check(struct spi_slave *slave)
55{
56 int ret;
57 uchar buf[4];
58
59 ret = flash_cmd(slave, CMD_ID, buf, sizeof(buf));
60 if (ret)
61 return ret;
62
63 if (buf[1] != 0x1F) {
64 printf("atmel flash not found (id[0] = %#x)\n", buf[1]);
65 return 1;
66 }
67
68 if ((buf[2] >> 5) != 0x1) {
69 printf("AT45 flash not found (id[0] = %#x)\n", buf[2]);
70 return 2;
71 }
72
73 return 0;
74}
75
76static char *getline(void)
77{
78 static char buffer[100];
79 char c;
80 size_t i;
81
82 i = 0;
83 while (1) {
84 buffer[i] = '\0';
85
86 c = getc();
87
88 switch (c) {
89 case '\r': /* Enter/Return key */
90 case '\n':
91 puts("\n");
92 return buffer;
93
94 case 0x03: /* ^C - break */
95 return NULL;
96
97 case 0x5F:
98 case 0x08: /* ^H - backspace */
99 case 0x7F: /* DEL - backspace */
100 if (i) {
101 puts("\b \b");
102 i--;
103 }
104 break;
105
106 default:
107 /* Ignore control characters */
108 if (c < 0x20)
109 break;
110 /* Queue up all other characters */
111 buffer[i++] = c;
112 printf("%c", c);
113 break;
114 }
115 }
116}
117
Wolfgang Denk54841ab2010-06-28 22:00:46 +0200118int atmel_df_pow2(int argc, char * const argv[])
Mike Frysinger65f6f072009-07-23 16:37:03 -0400119{
120 /* Print the ABI version */
121 app_startup(argv);
122 if (XF_VERSION != get_version()) {
123 printf("Expects ABI version %d\n", XF_VERSION);
124 printf("Actual U-Boot ABI version %lu\n", get_version());
125 printf("Can't run\n\n");
126 return 1;
127 }
128
129 spi_init();
130
131 while (1) {
132 struct spi_slave *slave;
133 char *line, *p;
134 int bus, cs, status;
135
136 puts("\nenter the [BUS:]CS of the SPI flash: ");
137 line = getline();
138
139 /* CTRL+C */
140 if (!line)
141 return 0;
142 if (line[0] == '\0')
143 continue;
144
145 bus = cs = simple_strtoul(line, &p, 10);
146 if (*p) {
147 if (*p == ':') {
148 ++p;
149 cs = simple_strtoul(p, &p, 10);
150 }
151 if (*p) {
152 puts("invalid format, please try again\n");
153 continue;
154 }
155 } else
156 bus = 0;
157
158 printf("\ngoing to work with dataflash at %i:%i\n", bus, cs);
159
160 /* use a low speed -- it'll work with all devices, and
161 * speed here doesn't really matter.
162 */
163 slave = spi_setup_slave(bus, cs, 1000, SPI_MODE_3);
164 if (!slave) {
165 puts("unable to setup slave\n");
166 continue;
167 }
168
169 if (spi_claim_bus(slave)) {
170 spi_free_slave(slave);
171 continue;
172 }
173
174 if (flash_check(slave)) {
175 puts("no flash found\n");
176 goto done;
177 }
178
179 status = flash_status(slave);
180 if (status == -1) {
181 puts("unable to read status register\n");
182 goto done;
183 }
184 if (status & 0x1) {
185 puts("flash is already in power-of-2 mode!\n");
186 goto done;
187 }
188
189 puts("are you sure you wish to set power-of-2 mode?\n");
190 puts("this operation is permanent and irreversible\n");
191 printf("enter YES to continue: ");
192 line = getline();
193 if (!line || strcmp(line, "YES"))
194 goto done;
195
196 if (flash_set_pow2(slave)) {
197 puts("setting pow2 mode failed\n");
198 goto done;
199 }
200
201 puts(
202 "Configuration should be updated now. You will have to\n"
203 "power cycle the part in order to finish the conversion.\n"
204 );
205
206 done:
207 spi_release_bus(slave);
208 spi_free_slave(slave);
209 }
210}