static int fw_read_stm(struct spi_device *spi, u32 fw_addr,
int len, const u8 *buffer)
{
int res;
struct stm32fwu_spi_cmd cmd;
struct stm32fwu_spi_cmd dummy_cmd;
int i;
u8 xor = 0;
u8 send_buff[STM_MAX_BUFFER_SIZE] = {0,};
cmd.cmd = WMEM_COMMAND;
cmd.xor_cmd = XOR_RMEM_COMMAND;
cmd.timeout = DEF_ACKCMD_NUMBER;
cmd.ack_pad = (u8)((fw_addr >> 24) & 0xFF);
res = stm32fwu_spi_send_cmd(spi, &cmd);
if (res != BL_ACK) {
pr_err("[SSP] Error %d sending read_mem cmd\n", res);
return res;
}
res = send_addr(spi, fw_addr, 0);
if (res != 0) {
pr_err("[SSP] Error %d sending read_mem Address\n", res);
return res;
}
res = send_byte_count(spi, len, 1);
if (res != 0) {
return -EPROTO;
}
// Add Read Syc
stm32fwu_spi_send_ack(spi, BL_DUMMY);
res = stm32fwu_spi_read(spi, buffer, len);
if (res < len) {
return -EIO;
}
return len;
}
static int stm32fwu_spi_wait_for_ack(struct spi_device *spi,
struct stm32fwu_spi_cmd *cmd, u8 dummy_bytes)
{
static int check_spi_wait_cnt = 1;
struct spi_message m;
char tx_buf = 0x0;
char rx_buf = 0x0;
struct spi_transfer t = {
.tx_buf = &tx_buf,
.rx_buf = &rx_buf,
.len = 1,
.bits_per_word = 8,
};
int i = 0;
int ret;
dummy_bytes = BL_DUMMY;
#if SSP_STM_DEBUG
pr_info("[SSP] %s: dummy byte = 0x%02hhx\n",
__func__, dummy_bytes);
#endif
while (i < cmd->timeout) {
tx_buf = dummy_bytes;
spi_message_init(&m);
spi_message_add_tail(&t, &m);
ret = spi_sync(spi, &m);
if (ret < 0) {
dev_err(&spi->dev, "%s: spi error %d\n", __func__, ret);
return ret;
} else if ((rx_buf == BL_ACK) || (rx_buf == BL_NACK)) {
// ACK cmd set
stm32fwu_spi_send_ack(spi, BL_ACK);
return (int)rx_buf;
} else {
// Cross cmd set
tx_buf = rx_buf;
}
if (check_spi_wait_cnt % 20 == 0)
msleep(1);
else
usleep_range(1000, 1100);
i++;
check_spi_wait_cnt++;
}
#if SSP_STM_DEBUG
dev_err(&spi->dev, "%s: Timeout after %d loops\n", __func__, cmd->timeout);
#endif
return -EIO;
}
static int stm32fwu_spi_send_cmd(struct spi_device *spi,
struct stm32fwu_spi_cmd *cmd)
{
u8 tx_buf[3] = {0,};
u8 rx_buf[3] = {0,};
u8 dummy_byte = 0;
struct spi_message m;
int ret;
#if BYTETOBYTE_USED
int i;
struct spi_transfer t[STM_MAX_BUFFER_SIZE];
memset(t, 0, STM_MAX_BUFFER_SIZE * sizeof(struct spi_transfer));
#else
struct spi_transfer t = {
.tx_buf = tx_buf,
.rx_buf = rx_buf,
.len = 3,
.bits_per_word = 8,
};
#endif
pr_debug("[SSP]%s\n", __func__);
spi_message_init(&m);
tx_buf[0] = BL_SPI_SOF;
tx_buf[1] = cmd->cmd;
tx_buf[2] = cmd->xor_cmd;
#if BYTETOBYTE_USED
for (i = 0; i < 3; i++) {
t[i].tx_buf = &tx_buf[i];
t[i].rx_buf = &rx_buf[i];
t[i].len = 1;
t[i].bits_per_word = 8;
t[i].delay_usecs = BYTE_DELAY_WRITE;
spi_message_add_tail(&t[i], &m);
}
#else
spi_message_add_tail(&t, &m);
#endif
ret = spi_sync(spi, &m);
if (ret < 0) {
dev_err(&spi->dev, "%s: spi error %d\n", __func__, ret);
return ret;
}
dummy_byte = cmd->ack_pad;
/* check for ack/nack and loop until found */
ret = stm32fwu_spi_wait_for_ack(spi, cmd, dummy_byte);
cmd->status = ret;
if (ret != BL_ACK) {
pr_err("[SSP] %s: Got NAK or Error %d\n", __func__, ret);
return ret;
}
return ret;
}
#if STM_SHOULD_BE_IMPLEMENT
static int stm32fwu_spi_read(struct spi_device *spi,
u8 *buffer, ssize_t len)
{
int ret;
int i;
u8 tx_buf[STM_MAX_BUFFER_SIZE] = {0,};
struct spi_message m;
struct spi_transfer t[STM_MAX_BUFFER_SIZE];
memset(t, 0, STM_MAX_BUFFER_SIZE * sizeof(struct spi_transfer));
spi_message_init(&m);
for (i = 0; i < len; i++) {
t[i].tx_buf = tx_buf;
t[i].rx_buf = &buffer[i];
t[i].len = 1;
t[i].bits_per_word = 8;
t[i].delay_usecs = BYTE_DELAY_READ;
spi_message_add_tail(&t[i], &m);
}
ret = spi_sync(spi, &m);
if (ret < 0) {
pr_err("[SSP] Error in %d spi_read()\n", ret);
return ret;
}
return len;
}
static int stm32fwu_spi_wait_for_ack(struct spi_device *spi,
struct stm32fwu_spi_cmd *cmd, u8 dummy_bytes)
{
static int check_spi_wait_cnt = 1;
struct spi_message m;
char tx_buf = 0x0;
char rx_buf = 0x0;
struct spi_transfer t = {
.tx_buf = &tx_buf,
.rx_buf = &rx_buf,
.len = 1,
.bits_per_word = 8,
};
int i = 0;
int ret;
dummy_bytes = BL_DUMMY;
#if SSP_STM_DEBUG
ssp_infof("dummy byte = 0x%02hhx", dummy_bytes);
#endif
while (i < cmd->timeout) {
tx_buf = dummy_bytes;
spi_message_init(&m);
spi_message_add_tail(&t, &m);
ret = spi_sync(spi, &m);
if (ret < 0) {
dev_err(&spi->dev, "%s: spi error %d\n", __func__, ret);
return ret;
} else if ((rx_buf == BL_ACK) || (rx_buf == BL_NACK)) {
/* ACK cmd set */
stm32fwu_spi_send_ack(spi, BL_ACK);
return (int)rx_buf;
} else {
/* Cross cmd set */
tx_buf = rx_buf;
}
if (check_spi_wait_cnt % 20 == 0)
usleep_range(1000, 1100);
else
usleep_range(1000, 1100);
i++;
check_spi_wait_cnt++;
}
#if SSP_STM_DEBUG
dev_err(&spi->dev, "%s: Timeout after %d loops\n",
__func__, cmd->timeout);
#endif
return -EIO;
}
static int stm32fwu_spi_send_cmd(struct spi_device *spi,
struct stm32fwu_spi_cmd *cmd)
{
u8 tx_buf[3] = {0,};
u8 rx_buf[3] = {0,};
u8 dummy_byte = 0;
struct spi_message m;
int ret;
#if BYTETOBYTE_USED
int i;
struct spi_transfer t[STM_MAX_BUFFER_SIZE];
memset(t, 0, STM_MAX_BUFFER_SIZE * sizeof(struct spi_transfer));
#else
struct spi_transfer t = {
.tx_buf = tx_buf,
.rx_buf = rx_buf,
.len = 3,
.bits_per_word = 8,
};
#endif
ssp_dbgf();
spi_message_init(&m);
tx_buf[0] = BL_SPI_SOF;
tx_buf[1] = cmd->cmd;
tx_buf[2] = cmd->xor_cmd;
#if BYTETOBYTE_USED
for (i = 0; i < 3; i++) {
t[i].tx_buf = &tx_buf[i];
t[i].rx_buf = &rx_buf[i];
t[i].len = 1;
t[i].bits_per_word = 8;
t[i].delay_usecs = BYTE_DELAY_WRITE;
spi_message_add_tail(&t[i], &m);
}
#else
spi_message_add_tail(&t, &m);
#endif
ret = spi_sync(spi, &m);
if (ret < 0) {
dev_err(&spi->dev, "%s: spi error %d\n", __func__, ret);
return ret;
}
dummy_byte = cmd->ack_pad;
/* check for ack/nack and loop until found */
ret = stm32fwu_spi_wait_for_ack(spi, cmd, dummy_byte);
cmd->status = ret;
if (ret != BL_ACK) {
ssp_errf("Got NAK or Error %d", ret);
return ret;
}
return ret;
}
static int stm32fwu_spi_write(struct spi_device *spi,
const u8 *buffer, ssize_t len)
{
int ret;
u8 rx_buf[STM_MAX_BUFFER_SIZE] = {0,};
struct spi_message m;
#if BYTETOBYTE_USED
struct spi_transfer t[STM_MAX_BUFFER_SIZE];
memset(t, 0, STM_MAX_BUFFER_SIZE * sizeof(struct spi_transfer));
int i;
#else
struct spi_transfer t = {
.tx_buf = buffer,
.rx_buf = rx_buf,
.len = (unsigned int)len,
.bits_per_word = 8,
};
#endif
spi_message_init(&m);
#if BYTETOBYTE_USED
for (i = 0; i < len; i++) {
t[i].tx_buf = &buffer[i];
t[i].rx_buf = &rx_buf[i];
t[i].len = 1;
t[i].bits_per_word = 8;
t[i].delay_usecs = BYTE_DELAY_WRITE;
spi_message_add_tail(&t[i], &m);
}
#else
spi_message_add_tail(&t, &m);
#endif
ret = spi_sync(spi, &m);
if (ret < 0) {
ssp_err("Error in %d spi_write()", ret);
return ret;
}
return len;
}
static int send_addr(struct spi_device *spi, u32 fw_addr, int send_short)
{
int res;
int i = send_short;
int len = SEND_ADDR_LEN - send_short;
u8 header[SEND_ADDR_LEN];
struct stm32fwu_spi_cmd dummy_cmd;
dummy_cmd.timeout = DEF_ACKROOF_NUMBER;
ssp_dbgf();
header[0] = (u8)((fw_addr >> 24) & 0xFF);
header[1] = (u8)((fw_addr >> 16) & 0xFF);
header[2] = (u8)((fw_addr >> 8) & 0xFF);
header[3] = (u8)(fw_addr & 0xFF);
header[4] = header[0] ^ header[1] ^ header[2] ^ header[3];
res = stm32fwu_spi_write(spi, &header[i], len);
if (res < len) {
ssp_err("Error in sending address. Res %d", res);
return (res > 0) ? -EIO : res;
}
res = stm32fwu_spi_wait_for_ack(spi, &dummy_cmd, BL_ACK);
if (res != BL_ACK) {
ssp_err("send_addr(): rcv_ack returned 0x%x", res);
return res;
}
return 0;
}
