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![Mike Partington](/assets/img/avatar_default.png)
Modify exports.h to remove its dependencies on other files, thus enabling standalone apps to require only exports.h from the U-Boot source tree. This appears to be the intent based on the following note: http://lists.denx.de/pipermail/u-boot/2010-January/067174.html Signed-off-by: Mike Partington <mparting@lexmark.com>
211 lines
3.7 KiB
C
211 lines
3.7 KiB
C
/*
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* atmel_df_pow2.c - convert Atmel Dataflashes to Power of 2 mode
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*
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* Copyright 2009 Analog Devices Inc.
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*
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* Licensed under the 2-clause BSD.
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*/
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#include <common.h>
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#include <exports.h>
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#include <spi.h>
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#define CMD_ID 0x9f
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#define CMD_STAT 0xd7
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#define CMD_CFG 0x3d
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static int flash_cmd(struct spi_slave *slave, uchar cmd, uchar *buf, int len)
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{
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buf[0] = cmd;
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return spi_xfer(slave, 8 * len, buf, buf, SPI_XFER_BEGIN | SPI_XFER_END);
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}
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static int flash_status(struct spi_slave *slave)
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{
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uchar buf[2];
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if (flash_cmd(slave, CMD_STAT, buf, sizeof(buf)))
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return -1;
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return buf[1];
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}
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static int flash_set_pow2(struct spi_slave *slave)
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{
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int ret;
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uchar buf[4];
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buf[1] = 0x2a;
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buf[2] = 0x80;
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buf[3] = 0xa6;
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ret = flash_cmd(slave, CMD_CFG, buf, sizeof(buf));
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if (ret)
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return ret;
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/* wait Tp, or 6 msec */
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udelay(6000);
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ret = flash_status(slave);
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if (ret == -1)
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return 1;
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return ret & 0x1 ? 0 : 1;
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}
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static int flash_check(struct spi_slave *slave)
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{
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int ret;
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uchar buf[4];
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ret = flash_cmd(slave, CMD_ID, buf, sizeof(buf));
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if (ret)
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return ret;
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if (buf[1] != 0x1F) {
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printf("atmel flash not found (id[0] = %#x)\n", buf[1]);
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return 1;
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}
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if ((buf[2] >> 5) != 0x1) {
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printf("AT45 flash not found (id[0] = %#x)\n", buf[2]);
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return 2;
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}
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return 0;
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}
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static char *getline(void)
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{
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static char buffer[100];
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char c;
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size_t i;
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i = 0;
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while (1) {
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buffer[i] = '\0';
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c = getc();
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switch (c) {
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case '\r': /* Enter/Return key */
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case '\n':
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puts("\n");
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return buffer;
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case 0x03: /* ^C - break */
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return NULL;
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case 0x5F:
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case 0x08: /* ^H - backspace */
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case 0x7F: /* DEL - backspace */
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if (i) {
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puts("\b \b");
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i--;
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}
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break;
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default:
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/* Ignore control characters */
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if (c < 0x20)
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break;
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/* Queue up all other characters */
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buffer[i++] = c;
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printf("%c", c);
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break;
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}
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}
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}
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int atmel_df_pow2(int argc, char * const argv[])
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{
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/* Print the ABI version */
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app_startup(argv);
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if (XF_VERSION != get_version()) {
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printf("Expects ABI version %d\n", XF_VERSION);
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printf("Actual U-Boot ABI version %lu\n", get_version());
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printf("Can't run\n\n");
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return 1;
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}
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spi_init();
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while (1) {
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struct spi_slave *slave;
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char *line, *p;
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int bus, cs, status;
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puts("\nenter the [BUS:]CS of the SPI flash: ");
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line = getline();
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/* CTRL+C */
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if (!line)
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return 0;
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if (line[0] == '\0')
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continue;
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bus = cs = simple_strtoul(line, &p, 10);
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if (*p) {
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if (*p == ':') {
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++p;
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cs = simple_strtoul(p, &p, 10);
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}
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if (*p) {
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puts("invalid format, please try again\n");
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continue;
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}
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} else
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bus = 0;
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printf("\ngoing to work with dataflash at %i:%i\n", bus, cs);
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/* use a low speed -- it'll work with all devices, and
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* speed here doesn't really matter.
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*/
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slave = spi_setup_slave(bus, cs, 1000, SPI_MODE_3);
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if (!slave) {
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puts("unable to setup slave\n");
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continue;
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}
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if (spi_claim_bus(slave)) {
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spi_free_slave(slave);
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continue;
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}
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if (flash_check(slave)) {
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puts("no flash found\n");
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goto done;
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}
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status = flash_status(slave);
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if (status == -1) {
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puts("unable to read status register\n");
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goto done;
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}
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if (status & 0x1) {
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puts("flash is already in power-of-2 mode!\n");
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goto done;
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}
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puts("are you sure you wish to set power-of-2 mode?\n");
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puts("this operation is permanent and irreversible\n");
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printf("enter YES to continue: ");
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line = getline();
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if (!line || strcmp(line, "YES"))
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goto done;
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if (flash_set_pow2(slave)) {
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puts("setting pow2 mode failed\n");
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goto done;
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}
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puts(
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"Configuration should be updated now. You will have to\n"
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"power cycle the part in order to finish the conversion.\n"
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);
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done:
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spi_release_bus(slave);
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spi_free_slave(slave);
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}
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}
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