From 65f6f07b72a71b83d775c4d20d7ebcd6b2d2086d Mon Sep 17 00:00:00 2001 From: Mike Frysinger Date: Thu, 23 Jul 2009 16:37:03 -0400 Subject: [PATCH] atmel_df_pow2: standalone to convert dataflashes to pow2 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 --- examples/standalone/.gitignore | 1 + examples/standalone/Makefile | 4 + examples/standalone/atmel_df_pow2.c | 209 ++++++++++++++++++++++++++++ 3 files changed, 214 insertions(+) create mode 100644 examples/standalone/atmel_df_pow2.c diff --git a/examples/standalone/.gitignore b/examples/standalone/.gitignore index 0d1864cc28..7b783fc213 100644 --- a/examples/standalone/.gitignore +++ b/examples/standalone/.gitignore @@ -1,4 +1,5 @@ /82559_eeprom +/atmel_df_pow2 /hello_world /interrupt /mem_to_mem_idma2intr diff --git a/examples/standalone/Makefile b/examples/standalone/Makefile index d2e811a8b5..9a9b6c38ef 100644 --- a/examples/standalone/Makefile +++ b/examples/standalone/Makefile @@ -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 index 0000000000..db0cd693a9 --- /dev/null +++ b/examples/standalone/atmel_df_pow2.c @@ -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 +#include + +#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); + } +} -- 2.30.2