u-boot/examples/standalone/atmel_df_pow2.c
Tom Rini d678a59d2d Revert "Merge patch series "arm: dts: am62-beagleplay: Fix Beagleplay Ethernet""
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay
Ethernet"' I failed to notice that b4 noticed it was based on next and
so took that as the base commit and merged that part of next to master.

This reverts commit c8ffd1356d, reversing
changes made to 2ee6f3a5f7.

Reported-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Tom Rini <trini@konsulko.com>
2024-05-19 08:16:36 -06:00

211 lines
3.7 KiB
C

/*
* 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>
#include <spi.h>
#include <linux/delay.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 *const 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;
}
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 = dectoul(line, &p);
cs = bus;
if (*p) {
if (*p == ':') {
++p;
cs = dectoul(p, &p);
}
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);
}
}