examples/standalone/atmel_df_pow2.c

   1 /*
   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
  16 static 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
  22 static 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
  30 static 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
  53 static 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
  75 static 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
 117 int atmel_df_pow2(int argc, char * const 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 }