atmel_df_pow2: standalone to convert dataflashes to pow2
authorMike Frysinger <vapier@gentoo.org>
Thu, 23 Jul 2009 20:37:03 +0000 (16:37 -0400)
committerTom Rix <Tom.Rix@windriver.com>
Sat, 3 Oct 2009 14:04:07 +0000 (09:04 -0500)
Atmel DataFlashes by default operate with pages that are slightly bigger
than normal binary sizes (i.e. many are 1056 byte pages rather than 1024
bytes).  However, they also have a "power of 2" mode where the pages show
up with the normal binary size.  The latter mode is required in order to
boot with a Blackfin processor, so many people wish to convert their
DataFlashes on their development systems to this mode.  This standalone
application does just that.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
examples/standalone/.gitignore
examples/standalone/Makefile
examples/standalone/atmel_df_pow2.c [new file with mode: 0644]

index 0d1864c..7b783fc 100644 (file)
@@ -1,4 +1,5 @@
 /82559_eeprom
+/atmel_df_pow2
 /hello_world
 /interrupt
 /mem_to_mem_idma2intr
index d2e811a..9a9b6c3 100644 (file)
@@ -86,6 +86,10 @@ ELF  = hello_world
 SREC   = hello_world.srec
 BIN    = hello_world.bin
 
+ELF    += atmel_df_pow2
+SREC   += atmel_df_pow2.srec
+BIN    += atmel_df_pow2.bin
+
 ifeq ($(CPU),mpc8xx)
 ELF    += test_burst
 SREC   += test_burst.srec
diff --git a/examples/standalone/atmel_df_pow2.c b/examples/standalone/atmel_df_pow2.c
new file mode 100644 (file)
index 0000000..db0cd69
--- /dev/null
@@ -0,0 +1,209 @@
+/*
+ * atmel_df_pow2.c - convert Atmel Dataflashes to Power of 2 mode
+ *
+ * Copyright 2009 Analog Devices Inc.
+ *
+ * Licensed under the 2-clause BSD.
+ */
+
+#include <common.h>
+#include <exports.h>
+
+#define CMD_ID    0x9f
+#define CMD_STAT  0xd7
+#define CMD_CFG   0x3d
+
+static int flash_cmd(struct spi_slave *slave, uchar cmd, uchar *buf, int len)
+{
+       buf[0] = cmd;
+       return spi_xfer(slave, 8 * len, buf, buf, SPI_XFER_BEGIN | SPI_XFER_END);
+}
+
+static int flash_status(struct spi_slave *slave)
+{
+       uchar buf[2];
+       if (flash_cmd(slave, CMD_STAT, buf, sizeof(buf)))
+               return -1;
+       return buf[1];
+}
+
+static int flash_set_pow2(struct spi_slave *slave)
+{
+       int ret;
+       uchar buf[4];
+
+       buf[1] = 0x2a;
+       buf[2] = 0x80;
+       buf[3] = 0xa6;
+
+       ret = flash_cmd(slave, CMD_CFG, buf, sizeof(buf));
+       if (ret)
+               return ret;
+
+       /* wait Tp, or 6 msec */
+       udelay(6000);
+
+       ret = flash_status(slave);
+       if (ret == -1)
+               return 1;
+
+       return ret & 0x1 ? 0 : 1;
+}
+
+static int flash_check(struct spi_slave *slave)
+{
+       int ret;
+       uchar buf[4];
+
+       ret = flash_cmd(slave, CMD_ID, buf, sizeof(buf));
+       if (ret)
+               return ret;
+
+       if (buf[1] != 0x1F) {
+               printf("atmel flash not found (id[0] = %#x)\n", buf[1]);
+               return 1;
+       }
+
+       if ((buf[2] >> 5) != 0x1) {
+               printf("AT45 flash not found (id[0] = %#x)\n", buf[2]);
+               return 2;
+       }
+
+       return 0;
+}
+
+static char *getline(void)
+{
+       static char buffer[100];
+       char c;
+       size_t i;
+
+       i = 0;
+       while (1) {
+               buffer[i] = '\0';
+
+               c = getc();
+
+               switch (c) {
+               case '\r':      /* Enter/Return key */
+               case '\n':
+                       puts("\n");
+                       return buffer;
+
+               case 0x03:      /* ^C - break */
+                       return NULL;
+
+               case 0x5F:
+               case 0x08:      /* ^H  - backspace */
+               case 0x7F:      /* DEL - backspace */
+                       if (i) {
+                               puts("\b \b");
+                               i--;
+                       }
+                       break;
+
+               default:
+                       /* Ignore control characters */
+                       if (c < 0x20)
+                               break;
+                       /* Queue up all other characters */
+                       buffer[i++] = c;
+                       printf("%c", c);
+                       break;
+               }
+       }
+}
+
+int atmel_df_pow2(int argc, char *argv[])
+{
+       /* Print the ABI version */
+       app_startup(argv);
+       if (XF_VERSION != get_version()) {
+               printf("Expects ABI version %d\n", XF_VERSION);
+               printf("Actual U-Boot ABI version %lu\n", get_version());
+               printf("Can't run\n\n");
+               return 1;
+       }
+
+       spi_init();
+
+       while (1) {
+               struct spi_slave *slave;
+               char *line, *p;
+               int bus, cs, status;
+
+               puts("\nenter the [BUS:]CS of the SPI flash: ");
+               line = getline();
+
+               /* CTRL+C */
+               if (!line)
+                       return 0;
+               if (line[0] == '\0')
+                       continue;
+
+               bus = cs = simple_strtoul(line, &p, 10);
+               if (*p) {
+                       if (*p == ':') {
+                               ++p;
+                               cs = simple_strtoul(p, &p, 10);
+                       }
+                       if (*p) {
+                               puts("invalid format, please try again\n");
+                               continue;
+                       }
+               } else
+                       bus = 0;
+
+               printf("\ngoing to work with dataflash at %i:%i\n", bus, cs);
+
+               /* use a low speed -- it'll work with all devices, and
+                * speed here doesn't really matter.
+                */
+               slave = spi_setup_slave(bus, cs, 1000, SPI_MODE_3);
+               if (!slave) {
+                       puts("unable to setup slave\n");
+                       continue;
+               }
+
+               if (spi_claim_bus(slave)) {
+                       spi_free_slave(slave);
+                       continue;
+               }
+
+               if (flash_check(slave)) {
+                       puts("no flash found\n");
+                       goto done;
+               }
+
+               status = flash_status(slave);
+               if (status == -1) {
+                       puts("unable to read status register\n");
+                       goto done;
+               }
+               if (status & 0x1) {
+                       puts("flash is already in power-of-2 mode!\n");
+                       goto done;
+               }
+
+               puts("are you sure you wish to set power-of-2 mode?\n");
+               puts("this operation is permanent and irreversible\n");
+               printf("enter YES to continue: ");
+               line = getline();
+               if (!line || strcmp(line, "YES"))
+                       goto done;
+
+               if (flash_set_pow2(slave)) {
+                       puts("setting pow2 mode failed\n");
+                       goto done;
+               }
+
+               puts(
+                       "Configuration should be updated now.  You will have to\n"
+                       "power cycle the part in order to finish the conversion.\n"
+               );
+
+ done:
+               spi_release_bus(slave);
+               spi_free_slave(slave);
+       }
+}