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// SPDX-License-Identifier: GPL-2.0+
/*
* dfu.c -- DFU back-end routines
*
* Copyright (C) 2012 Samsung Electronics
* author: Lukasz Majewski <l.majewski@samsung.com>
*/
#include <common.h>
#include <errno.h>
#include <malloc.h>
#include <mmc.h>
#include <fat.h>
#include <dfu.h>
#include <hash.h>
#include <linux/list.h>
#include <linux/compiler.h>
static LIST_HEAD(dfu_list);
static int dfu_alt_num;
static int alt_num_cnt;
static struct hash_algo *dfu_hash_algo;
/*
* The purpose of the dfu_usb_get_reset() function is to
* provide information if after USB_DETACH request
* being sent the dfu-util performed reset of USB
* bus.
*
* Described behaviour is the only way to distinct if
* user has typed -e (detach) or -R (reset) when invoking
* dfu-util command.
*
*/
__weak bool dfu_usb_get_reset(void)
{
#ifdef CONFIG_SPL_DFU_NO_RESET
return false;
#else
return true;
#endif
}
static int dfu_find_alt_num(const char *s)
{
int i = 0;
for (; *s; s++)
if (*s == ';')
i++;
return ++i;
}
int dfu_init_env_entities(char *interface, char *devstr)
{
const char *str_env;
char *env_bkp;
int ret = 0;
#ifdef CONFIG_SET_DFU_ALT_INFO
set_dfu_alt_info(interface, devstr);
#endif
str_env = env_get("dfu_alt_info");
if (!str_env) {
pr_err("\"dfu_alt_info\" env variable not defined!\n");
return -EINVAL;
}
env_bkp = strdup(str_env);
ret = dfu_config_entities(env_bkp, interface, devstr);
if (ret) {
pr_err("DFU entities configuration failed!\n");
pr_err("(partition table does not match dfu_alt_info?)\n");
goto done;
}
done:
free(env_bkp);
return ret;
}
static unsigned char *dfu_buf;
static unsigned long dfu_buf_size;
unsigned char *dfu_free_buf(void)
{
free(dfu_buf);
dfu_buf = NULL;
return dfu_buf;
}
unsigned long dfu_get_buf_size(void)
{
return dfu_buf_size;
}
unsigned char *dfu_get_buf(struct dfu_entity *dfu)
{
char *s;
if (dfu_buf != NULL)
return dfu_buf;
s = env_get("dfu_bufsiz");
if (s)
dfu_buf_size = (unsigned long)simple_strtol(s, NULL, 0);
if (!s || !dfu_buf_size)
dfu_buf_size = CONFIG_SYS_DFU_DATA_BUF_SIZE;
if (dfu->max_buf_size && dfu_buf_size > dfu->max_buf_size)
dfu_buf_size = dfu->max_buf_size;
dfu_buf = memalign(CONFIG_SYS_CACHELINE_SIZE, dfu_buf_size);
if (dfu_buf == NULL)
printf("%s: Could not memalign 0x%lx bytes\n",
__func__, dfu_buf_size);
return dfu_buf;
}
static char *dfu_get_hash_algo(void)
{
char *s;
s = env_get("dfu_hash_algo");
if (!s)
return NULL;
if (!strcmp(s, "crc32")) {
debug("%s: DFU hash method: %s\n", __func__, s);
return s;
}
pr_err("DFU hash method: %s not supported!\n", s);
return NULL;
}
static int dfu_write_buffer_drain(struct dfu_entity *dfu)
{
long w_size;
int ret;
/* flush size? */
w_size = dfu->i_buf - dfu->i_buf_start;
if (w_size == 0)
return 0;
if (dfu_hash_algo)
dfu_hash_algo->hash_update(dfu_hash_algo, &dfu->crc,
dfu->i_buf_start, w_size, 0);
ret = dfu->write_medium(dfu, dfu->offset, dfu->i_buf_start, &w_size);
if (ret)
debug("%s: Write error!\n", __func__);
/* point back */
dfu->i_buf = dfu->i_buf_start;
/* update offset */
dfu->offset += w_size;
puts("#");
return ret;
}
void dfu_transaction_cleanup(struct dfu_entity *dfu)
{
/* clear everything */
dfu->crc = 0;
dfu->offset = 0;
dfu->i_blk_seq_num = 0;
dfu->i_buf_start = dfu_get_buf(dfu);
dfu->i_buf_end = dfu->i_buf_start;
dfu->i_buf = dfu->i_buf_start;
dfu->r_left = 0;
dfu->b_left = 0;
dfu->bad_skip = 0;
dfu->inited = 0;
}
int dfu_transaction_initiate(struct dfu_entity *dfu, bool read)
{
int ret = 0;
if (dfu->inited)
return 0;
dfu_transaction_cleanup(dfu);
if (dfu->i_buf_start == NULL)
return -ENOMEM;
dfu->i_buf_end = dfu->i_buf_start + dfu_get_buf_size();
if (read) {
ret = dfu->get_medium_size(dfu, &dfu->r_left);
if (ret < 0)
return ret;
debug("%s: %s %lld [B]\n", __func__, dfu->name, dfu->r_left);
}
dfu->inited = 1;
return 0;
}
int dfu_flush(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
{
int ret = 0;
ret = dfu_write_buffer_drain(dfu);
if (ret)
return ret;
if (dfu->flush_medium)
ret = dfu->flush_medium(dfu);
if (dfu_hash_algo)
printf("\nDFU complete %s: 0x%08x\n", dfu_hash_algo->name,
dfu->crc);
dfu_transaction_cleanup(dfu);
return ret;
}
int dfu_write(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
{
int ret;
debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x offset: 0x%llx bufoffset: 0x%lx\n",
__func__, dfu->name, buf, size, blk_seq_num, dfu->offset,
(unsigned long)(dfu->i_buf - dfu->i_buf_start));
ret = dfu_transaction_initiate(dfu, false);
if (ret < 0)
return ret;
if (dfu->i_blk_seq_num != blk_seq_num) {
printf("%s: Wrong sequence number! [%d] [%d]\n",
__func__, dfu->i_blk_seq_num, blk_seq_num);
dfu_transaction_cleanup(dfu);
return -1;
}
/* DFU 1.1 standard says:
* The wBlockNum field is a block sequence number. It increments each
* time a block is transferred, wrapping to zero from 65,535. It is used
* to provide useful context to the DFU loader in the device."
*
* This means that it's a 16 bit counter that roll-overs at
* 0xffff -> 0x0000. By having a typical 4K transfer block
* we roll-over at exactly 256MB. Not very fun to debug.
*
* Handling rollover, and having an inited variable,
* makes things work.
*/
/* handle rollover */
dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;
/* flush buffer if overflow */
if ((dfu->i_buf + size) > dfu->i_buf_end) {
ret = dfu_write_buffer_drain(dfu);
if (ret) {
dfu_transaction_cleanup(dfu);
return ret;
}
}
/* we should be in buffer now (if not then size too large) */
if ((dfu->i_buf + size) > dfu->i_buf_end) {
pr_err("Buffer overflow! (0x%p + 0x%x > 0x%p)\n", dfu->i_buf,
size, dfu->i_buf_end);
dfu_transaction_cleanup(dfu);
return -1;
}
memcpy(dfu->i_buf, buf, size);
dfu->i_buf += size;
/* if end or if buffer full flush */
if (size == 0 || (dfu->i_buf + size) > dfu->i_buf_end) {
ret = dfu_write_buffer_drain(dfu);
if (ret) {
dfu_transaction_cleanup(dfu);
return ret;
}
}
return 0;
}
static int dfu_read_buffer_fill(struct dfu_entity *dfu, void *buf, int size)
{
long chunk;
int ret, readn;
readn = 0;
while (size > 0) {
/* get chunk that can be read */
chunk = min((long)size, dfu->b_left);
/* consume */
if (chunk > 0) {
memcpy(buf, dfu->i_buf, chunk);
if (dfu_hash_algo)
dfu_hash_algo->hash_update(dfu_hash_algo,
&dfu->crc, buf,
chunk, 0);
dfu->i_buf += chunk;
dfu->b_left -= chunk;
size -= chunk;
buf += chunk;
readn += chunk;
}
/* all done */
if (size > 0) {
/* no more to read */
if (dfu->r_left == 0)
break;
dfu->i_buf = dfu->i_buf_start;
dfu->b_left = dfu->i_buf_end - dfu->i_buf_start;
/* got to read, but buffer is empty */
if (dfu->b_left > dfu->r_left)
dfu->b_left = dfu->r_left;
ret = dfu->read_medium(dfu, dfu->offset, dfu->i_buf,
&dfu->b_left);
if (ret != 0) {
debug("%s: Read error!\n", __func__);
return ret;
}
dfu->offset += dfu->b_left;
dfu->r_left -= dfu->b_left;
puts("#");
}
}
return readn;
}
int dfu_read(struct dfu_entity *dfu, void *buf, int size, int blk_seq_num)
{
int ret = 0;
debug("%s: name: %s buf: 0x%p size: 0x%x p_num: 0x%x i_buf: 0x%p\n",
__func__, dfu->name, buf, size, blk_seq_num, dfu->i_buf);
ret = dfu_transaction_initiate(dfu, true);
if (ret < 0)
return ret;
if (dfu->i_blk_seq_num != blk_seq_num) {
printf("%s: Wrong sequence number! [%d] [%d]\n",
__func__, dfu->i_blk_seq_num, blk_seq_num);
return -1;
}
/* handle rollover */
dfu->i_blk_seq_num = (dfu->i_blk_seq_num + 1) & 0xffff;
ret = dfu_read_buffer_fill(dfu, buf, size);
if (ret < 0) {
printf("%s: Failed to fill buffer\n", __func__);
return -1;
}
if (ret < size) {
if (dfu_hash_algo)
debug("%s: %s %s: 0x%x\n", __func__, dfu->name,
dfu_hash_algo->name, dfu->crc);
puts("\nUPLOAD ... done\nCtrl+C to exit ...\n");
dfu_transaction_cleanup(dfu);
}
return ret;
}
static int dfu_fill_entity(struct dfu_entity *dfu, char *s, int alt,
char *interface, char *devstr)
{
char *st;
debug("%s: %s interface: %s dev: %s\n", __func__, s, interface, devstr);
st = strsep(&s, " ");
strcpy(dfu->name, st);
dfu->alt = alt;
dfu->max_buf_size = 0;
dfu->free_entity = NULL;
/* Specific for mmc device */
if (strcmp(interface, "mmc") == 0) {
if (dfu_fill_entity_mmc(dfu, devstr, s))
return -1;
} else if (strcmp(interface, "nand") == 0) {
if (dfu_fill_entity_nand(dfu, devstr, s))
return -1;
} else if (strcmp(interface, "ram") == 0) {
if (dfu_fill_entity_ram(dfu, devstr, s))
return -1;
} else if (strcmp(interface, "sf") == 0) {
if (dfu_fill_entity_sf(dfu, devstr, s))
return -1;
} else {
printf("%s: Device %s not (yet) supported!\n",
__func__, interface);
return -1;
}
dfu_get_buf(dfu);
return 0;
}
void dfu_free_entities(void)
{
struct dfu_entity *dfu, *p, *t = NULL;
dfu_free_buf();
list_for_each_entry_safe_reverse(dfu, p, &dfu_list, list) {
list_del(&dfu->list);
if (dfu->free_entity)
dfu->free_entity(dfu);
t = dfu;
}
if (t)
free(t);
INIT_LIST_HEAD(&dfu_list);
alt_num_cnt = 0;
}
int dfu_config_entities(char *env, char *interface, char *devstr)
{
struct dfu_entity *dfu;
int i, ret;
char *s;
dfu_alt_num = dfu_find_alt_num(env);
debug("%s: dfu_alt_num=%d\n", __func__, dfu_alt_num);
dfu_hash_algo = NULL;
s = dfu_get_hash_algo();
if (s) {
ret = hash_lookup_algo(s, &dfu_hash_algo);
if (ret)
pr_err("Hash algorithm %s not supported\n", s);
}
dfu = calloc(sizeof(*dfu), dfu_alt_num);
if (!dfu)
return -1;
for (i = 0; i < dfu_alt_num; i++) {
s = strsep(&env, ";");
ret = dfu_fill_entity(&dfu[i], s, alt_num_cnt, interface,
devstr);
if (ret) {
/* We will free "dfu" in dfu_free_entities() */
return -1;
}
list_add_tail(&dfu[i].list, &dfu_list);
alt_num_cnt++;
}
return 0;
}
const char *dfu_get_dev_type(enum dfu_device_type t)
{
const char *dev_t[] = {NULL, "eMMC", "OneNAND", "NAND", "RAM", "SF" };
return dev_t[t];
}
const char *dfu_get_layout(enum dfu_layout l)
{
const char *dfu_layout[] = {NULL, "RAW_ADDR", "FAT", "EXT2",
"EXT3", "EXT4", "RAM_ADDR" };
return dfu_layout[l];
}
void dfu_show_entities(void)
{
struct dfu_entity *dfu;
puts("DFU alt settings list:\n");
list_for_each_entry(dfu, &dfu_list, list) {
printf("dev: %s alt: %d name: %s layout: %s\n",
dfu_get_dev_type(dfu->dev_type), dfu->alt,
dfu->name, dfu_get_layout(dfu->layout));
}
}
int dfu_get_alt_number(void)
{
return dfu_alt_num;
}
struct dfu_entity *dfu_get_entity(int alt)
{
struct dfu_entity *dfu;
list_for_each_entry(dfu, &dfu_list, list) {
if (dfu->alt == alt)
return dfu;
}
return NULL;
}
int dfu_get_alt(char *name)
{
struct dfu_entity *dfu;
char *str;
list_for_each_entry(dfu, &dfu_list, list) {
if (dfu->name[0] != '/') {
if (!strncmp(dfu->name, name, strlen(dfu->name)))
return dfu->alt;
} else {
/*
* One must also consider absolute path
* (/boot/bin/uImage) available at dfu->name when
* compared "plain" file name (uImage)
*
* It is the case for e.g. thor gadget where lthor SW
* sends only the file name, so only the very last part
* of path must be checked for equality
*/
str = strstr(dfu->name, name);
if (!str)
continue;
/*
* Check if matching substring is the last element of
* dfu->name (uImage)
*/
if (strlen(dfu->name) ==
((str - dfu->name) + strlen(name)))
return dfu->alt;
}
}
return -ENODEV;
}
int dfu_write_from_mem_addr(struct dfu_entity *dfu, void *buf, int size)
{
unsigned long dfu_buf_size, write, left = size;
int i, ret = 0;
void *dp = buf;
/*
* Here we must call dfu_get_buf(dfu) first to be sure that dfu_buf_size
* has been properly initialized - e.g. if "dfu_bufsiz" has been taken
* into account.
*/
dfu_get_buf(dfu);
dfu_buf_size = dfu_get_buf_size();
debug("%s: dfu buf size: %lu\n", __func__, dfu_buf_size);
for (i = 0; left > 0; i++) {
write = min(dfu_buf_size, left);
debug("%s: dp: 0x%p left: %lu write: %lu\n", __func__,
dp, left, write);
ret = dfu_write(dfu, dp, write, i);
if (ret) {
pr_err("DFU write failed\n");
return ret;
}
dp += write;
left -= write;
}
ret = dfu_flush(dfu, NULL, 0, i);
if (ret)
pr_err("DFU flush failed!");
return ret;
}