u-boot/common/cmd_sf.c

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/*
* Command for accessing SPI flash.
*
* Copyright (C) 2008 Atmel Corporation
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <div64.h>
#include <malloc.h>
#include <spi_flash.h>
#include <asm/io.h>
static struct spi_flash *flash;
/*
* This function computes the length argument for the erase command.
* The length on which the command is to operate can be given in two forms:
* 1. <cmd> offset len - operate on <'offset', 'len')
* 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
* If the second form is used and the length doesn't fall on the
* sector boundary, than it will be adjusted to the next sector boundary.
* If it isn't in the flash, the function will fail (return -1).
* Input:
* arg: length specification (i.e. both command arguments)
* Output:
* len: computed length for operation
* Return:
* 1: success
* -1: failure (bad format, bad address).
*/
static int sf_parse_len_arg(char *arg, ulong *len)
{
char *ep;
char round_up_len; /* indicates if the "+length" form used */
ulong len_arg;
round_up_len = 0;
if (*arg == '+') {
round_up_len = 1;
++arg;
}
len_arg = simple_strtoul(arg, &ep, 16);
if (ep == arg || *ep != '\0')
return -1;
if (round_up_len && flash->sector_size > 0)
*len = ROUND(len_arg, flash->sector_size);
else
*len = len_arg;
return 1;
}
/**
* This function takes a byte length and a delta unit of time to compute the
* approximate bytes per second
*
* @param len amount of bytes currently processed
* @param start_ms start time of processing in ms
* @return bytes per second if OK, 0 on error
*/
static ulong bytes_per_second(unsigned int len, ulong start_ms)
{
/* less accurate but avoids overflow */
if (len >= ((unsigned int) -1) / 1024)
return len / (max(get_timer(start_ms) / 1024, 1));
else
return 1024 * len / max(get_timer(start_ms), 1);
}
static int do_spi_flash_probe(int argc, char * const argv[])
{
unsigned int bus = CONFIG_SF_DEFAULT_BUS;
unsigned int cs = CONFIG_SF_DEFAULT_CS;
unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
unsigned int mode = CONFIG_SF_DEFAULT_MODE;
char *endp;
struct spi_flash *new;
if (argc >= 2) {
cs = simple_strtoul(argv[1], &endp, 0);
if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
return -1;
if (*endp == ':') {
if (endp[1] == 0)
return -1;
bus = cs;
cs = simple_strtoul(endp + 1, &endp, 0);
if (*endp != 0)
return -1;
}
}
if (argc >= 3) {
speed = simple_strtoul(argv[2], &endp, 0);
if (*argv[2] == 0 || *endp != 0)
return -1;
}
if (argc >= 4) {
mode = simple_strtoul(argv[3], &endp, 16);
if (*argv[3] == 0 || *endp != 0)
return -1;
}
new = spi_flash_probe(bus, cs, speed, mode);
if (!new) {
printf("Failed to initialize SPI flash at %u:%u\n", bus, cs);
return 1;
}
if (flash)
spi_flash_free(flash);
flash = new;
return 0;
}
/**
* Write a block of data to SPI flash, first checking if it is different from
* what is already there.
*
* If the data being written is the same, then *skipped is incremented by len.
*
* @param flash flash context pointer
* @param offset flash offset to write
* @param len number of bytes to write
* @param buf buffer to write from
* @param cmp_buf read buffer to use to compare data
* @param skipped Count of skipped data (incremented by this function)
* @return NULL if OK, else a string containing the stage which failed
*/
static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
size_t len, const char *buf, char *cmp_buf, size_t *skipped)
{
debug("offset=%#x, sector_size=%#x, len=%#zx\n",
offset, flash->sector_size, len);
/* Read the entire sector so to allow for rewriting */
if (spi_flash_read(flash, offset, flash->sector_size, cmp_buf))
return "read";
/* Compare only what is meaningful (len) */
if (memcmp(cmp_buf, buf, len) == 0) {
debug("Skip region %x size %zx: no change\n",
offset, len);
*skipped += len;
return NULL;
}
/* Erase the entire sector */
if (spi_flash_erase(flash, offset, flash->sector_size))
return "erase";
/* Write the initial part of the block from the source */
if (spi_flash_write(flash, offset, len, buf))
return "write";
/* If it's a partial sector, rewrite the existing part */
if (len != flash->sector_size) {
/* Rewrite the original data to the end of the sector */
if (spi_flash_write(flash, offset + len,
flash->sector_size - len, &cmp_buf[len]))
return "write";
}
return NULL;
}
/**
* Update an area of SPI flash by erasing and writing any blocks which need
* to change. Existing blocks with the correct data are left unchanged.
*
* @param flash flash context pointer
* @param offset flash offset to write
* @param len number of bytes to write
* @param buf buffer to write from
* @return 0 if ok, 1 on error
*/
static int spi_flash_update(struct spi_flash *flash, u32 offset,
size_t len, const char *buf)
{
const char *err_oper = NULL;
char *cmp_buf;
const char *end = buf + len;
size_t todo; /* number of bytes to do in this pass */
size_t skipped = 0; /* statistics */
const ulong start_time = get_timer(0);
size_t scale = 1;
const char *start_buf = buf;
ulong delta;
if (end - buf >= 200)
scale = (end - buf) / 100;
cmp_buf = malloc(flash->sector_size);
if (cmp_buf) {
ulong last_update = get_timer(0);
for (; buf < end && !err_oper; buf += todo, offset += todo) {
todo = min(end - buf, flash->sector_size);
if (get_timer(last_update) > 100) {
printf(" \rUpdating, %zu%% %lu B/s",
100 - (end - buf) / scale,
bytes_per_second(buf - start_buf,
start_time));
last_update = get_timer(0);
}
err_oper = spi_flash_update_block(flash, offset, todo,
buf, cmp_buf, &skipped);
}
} else {
err_oper = "malloc";
}
free(cmp_buf);
putc('\r');
if (err_oper) {
printf("SPI flash failed in %s step\n", err_oper);
return 1;
}
delta = get_timer(start_time);
printf("%zu bytes written, %zu bytes skipped", len - skipped,
skipped);
printf(" in %ld.%lds, speed %ld B/s\n",
delta / 1000, delta % 1000, bytes_per_second(len, start_time));
return 0;
}
static int do_spi_flash_read_write(int argc, char * const argv[])
{
unsigned long addr;
unsigned long offset;
unsigned long len;
void *buf;
char *endp;
int ret = 1;
if (argc < 4)
return -1;
addr = simple_strtoul(argv[1], &endp, 16);
if (*argv[1] == 0 || *endp != 0)
return -1;
offset = simple_strtoul(argv[2], &endp, 16);
if (*argv[2] == 0 || *endp != 0)
return -1;
len = simple_strtoul(argv[3], &endp, 16);
if (*argv[3] == 0 || *endp != 0)
return -1;
/* Consistency checking */
if (offset + len > flash->size) {
printf("ERROR: attempting %s past flash size (%#x)\n",
argv[0], flash->size);
return 1;
}
buf = map_physmem(addr, len, MAP_WRBACK);
if (!buf) {
puts("Failed to map physical memory\n");
return 1;
}
if (strcmp(argv[0], "update") == 0) {
ret = spi_flash_update(flash, offset, len, buf);
} else if (strncmp(argv[0], "read", 4) == 0 ||
strncmp(argv[0], "write", 5) == 0) {
int read;
read = strncmp(argv[0], "read", 4) == 0;
if (read)
ret = spi_flash_read(flash, offset, len, buf);
else
ret = spi_flash_write(flash, offset, len, buf);
printf("SF: %zu bytes @ %#x %s: %s\n", (size_t)len, (u32)offset,
read ? "Read" : "Written", ret ? "ERROR" : "OK");
}
unmap_physmem(buf, len);
return ret == 0 ? 0 : 1;
}
static int do_spi_flash_erase(int argc, char * const argv[])
{
unsigned long offset;
unsigned long len;
char *endp;
int ret;
if (argc < 3)
return -1;
offset = simple_strtoul(argv[1], &endp, 16);
if (*argv[1] == 0 || *endp != 0)
return -1;
ret = sf_parse_len_arg(argv[2], &len);
if (ret != 1)
return -1;
/* Consistency checking */
if (offset + len > flash->size) {
printf("ERROR: attempting %s past flash size (%#x)\n",
argv[0], flash->size);
return 1;
}
ret = spi_flash_erase(flash, offset, len);
printf("SF: %zu bytes @ %#x Erased: %s\n", (size_t)len, (u32)offset,
ret ? "ERROR" : "OK");
return ret == 0 ? 0 : 1;
}
#ifdef CONFIG_CMD_SF_TEST
enum {
STAGE_ERASE,
STAGE_CHECK,
STAGE_WRITE,
STAGE_READ,
STAGE_COUNT,
};
static char *stage_name[STAGE_COUNT] = {
"erase",
"check",
"write",
"read",
};
struct test_info {
int stage;
int bytes;
unsigned base_ms;
unsigned time_ms[STAGE_COUNT];
};
static void show_time(struct test_info *test, int stage)
{
uint64_t speed; /* KiB/s */
int bps; /* Bits per second */
speed = (long long)test->bytes * 1000;
if (test->time_ms[stage])
do_div(speed, test->time_ms[stage] * 1024);
bps = speed * 8;
printf("%d %s: %d ticks, %d KiB/s %d.%03d Mbps\n", stage,
stage_name[stage], test->time_ms[stage],
(int)speed, bps / 1000, bps % 1000);
}
static void spi_test_next_stage(struct test_info *test)
{
test->time_ms[test->stage] = get_timer(test->base_ms);
show_time(test, test->stage);
test->base_ms = get_timer(0);
test->stage++;
}
/**
* Run a test on the SPI flash
*
* @param flash SPI flash to use
* @param buf Source buffer for data to write
* @param len Size of data to read/write
* @param offset Offset within flash to check
* @param vbuf Verification buffer
* @return 0 if ok, -1 on error
*/
static int spi_flash_test(struct spi_flash *flash, uint8_t *buf, ulong len,
ulong offset, uint8_t *vbuf)
{
struct test_info test;
int i;
printf("SPI flash test:\n");
memset(&test, '\0', sizeof(test));
test.base_ms = get_timer(0);
test.bytes = len;
if (spi_flash_erase(flash, offset, len)) {
printf("Erase failed\n");
return -1;
}
spi_test_next_stage(&test);
if (spi_flash_read(flash, offset, len, vbuf)) {
printf("Check read failed\n");
return -1;
}
for (i = 0; i < len; i++) {
if (vbuf[i] != 0xff) {
printf("Check failed at %d\n", i);
print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
return -1;
}
}
spi_test_next_stage(&test);
if (spi_flash_write(flash, offset, len, buf)) {
printf("Write failed\n");
return -1;
}
memset(vbuf, '\0', len);
spi_test_next_stage(&test);
if (spi_flash_read(flash, offset, len, vbuf)) {
printf("Read failed\n");
return -1;
}
spi_test_next_stage(&test);
for (i = 0; i < len; i++) {
if (buf[i] != vbuf[i]) {
printf("Verify failed at %d, good data:\n", i);
print_buffer(i, buf + i, 1, min(len - i, 0x40), 0);
printf("Bad data:\n");
print_buffer(i, vbuf + i, 1, min(len - i, 0x40), 0);
return -1;
}
}
printf("Test passed\n");
for (i = 0; i < STAGE_COUNT; i++)
show_time(&test, i);
return 0;
}
static int do_spi_flash_test(int argc, char * const argv[])
{
unsigned long offset;
unsigned long len;
uint8_t *buf, *from;
char *endp;
uint8_t *vbuf;
int ret;
if (argc < 3)
return -1;
offset = simple_strtoul(argv[1], &endp, 16);
if (*argv[1] == 0 || *endp != 0)
return -1;
len = simple_strtoul(argv[2], &endp, 16);
if (*argv[2] == 0 || *endp != 0)
return -1;
vbuf = malloc(len);
if (!vbuf) {
printf("Cannot allocate memory (%lu bytes)\n", len);
return 1;
}
buf = malloc(len);
if (!buf) {
free(vbuf);
printf("Cannot allocate memory (%lu bytes)\n", len);
return 1;
}
from = map_sysmem(CONFIG_SYS_TEXT_BASE, 0);
memcpy(buf, from, len);
ret = spi_flash_test(flash, buf, len, offset, vbuf);
free(vbuf);
free(buf);
if (ret) {
printf("Test failed\n");
return 1;
}
return 0;
}
#endif /* CONFIG_CMD_SF_TEST */
static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc,
char * const argv[])
{
const char *cmd;
int ret;
/* need at least two arguments */
if (argc < 2)
goto usage;
cmd = argv[1];
--argc;
++argv;
if (strcmp(cmd, "probe") == 0) {
ret = do_spi_flash_probe(argc, argv);
goto done;
}
/* The remaining commands require a selected device */
if (!flash) {
puts("No SPI flash selected. Please run `sf probe'\n");
return 1;
}
if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
strcmp(cmd, "update") == 0)
ret = do_spi_flash_read_write(argc, argv);
else if (strcmp(cmd, "erase") == 0)
ret = do_spi_flash_erase(argc, argv);
#ifdef CONFIG_CMD_SF_TEST
else if (!strcmp(cmd, "test"))
ret = do_spi_flash_test(argc, argv);
#endif
else
ret = -1;
done:
if (ret != -1)
return ret;
usage:
return CMD_RET_USAGE;
}
#ifdef CONFIG_CMD_SF_TEST
#define SF_TEST_HELP "\nsf test offset len " \
"- run a very basic destructive test"
#else
#define SF_TEST_HELP
#endif
U_BOOT_CMD(
sf, 5, 1, do_spi_flash,
"SPI flash sub-system",
"probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
" and chip select\n"
"sf read addr offset len - read `len' bytes starting at\n"
" `offset' to memory at `addr'\n"
"sf write addr offset len - write `len' bytes from memory\n"
" at `addr' to flash at `offset'\n"
"sf erase offset [+]len - erase `len' bytes from `offset'\n"
" `+len' round up `len' to block size\n"
"sf update addr offset len - erase and write `len' bytes from memory\n"
" at `addr' to flash at `offset'"
SF_TEST_HELP
);