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spi: fsl-espi: eliminate spi nor flash read loop

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The fsl-espi driver contains a read loop that implicitely assumes that
the device to read from is a m25p80 SPI NOR flash (bytes 2 - 4 of the
first write transfer are interpreted as 3 byte flash address).

Now that we have such a read loop in the spi-nor driver and are able
to correctly indicate the message size limit of the controller,
the read loop can be removed from the fsl-espi driver.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Heiner Kallweit 2016-08-17 21:11:01 +02:00 committed by Mark Brown
parent 5090cc6ae2
commit 02a595d5d6
1 changed files with 21 additions and 70 deletions
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91
drivers/spi/spi-fsl-espi.c
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@ -258,23 +258,6 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t)
return mpc8xxx_spi->count;
}
static inline void fsl_espi_addr2cmd(unsigned int addr, u8 *cmd)
{
if (cmd) {
cmd[1] = (u8)(addr >> 16);
cmd[2] = (u8)(addr >> 8);
cmd[3] = (u8)(addr >> 0);
}
}
static inline unsigned int fsl_espi_cmd2addr(u8 *cmd)
{
if (cmd)
return cmd[1] << 16 | cmd[2] << 8 | cmd[3] << 0;
return 0;
}
static void fsl_espi_do_trans(struct spi_message *m,
struct fsl_espi_transfer *tr)
{
@ -366,68 +349,36 @@ static void fsl_espi_cmd_trans(struct spi_message *m,
static void fsl_espi_rw_trans(struct spi_message *m,
struct fsl_espi_transfer *trans, u8 *rx_buff)
{
struct fsl_espi_transfer *espi_trans = trans;
unsigned int total_len = espi_trans->len;
struct spi_transfer *t;
u8 *local_buf;
u8 *rx_buf = rx_buff;
unsigned int trans_len;
unsigned int addr;
unsigned int tx_only;
unsigned int rx_pos = 0;
unsigned int pos;
int i, loop;
unsigned int tx_only = 0;
int i = 0;
local_buf = kzalloc(SPCOM_TRANLEN_MAX, GFP_KERNEL);
if (!local_buf) {
espi_trans->status = -ENOMEM;
trans->status = -ENOMEM;
return;
}
for (pos = 0, loop = 0; pos < total_len; pos += trans_len, loop++) {
trans_len = total_len - pos;
i = 0;
tx_only = 0;
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->tx_buf) {
memcpy(local_buf + i, t->tx_buf, t->len);
i += t->len;
if (!t->rx_buf)
tx_only += t->len;
}
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->tx_buf) {
memcpy(local_buf + i, t->tx_buf, t->len);
i += t->len;
if (!t->rx_buf)
tx_only += t->len;
}
}
/* Add additional TX bytes to compensate SPCOM_TRANLEN_MAX */
if (loop > 0)
trans_len += tx_only;
trans->tx_buf = local_buf;
trans->rx_buf = local_buf;
fsl_espi_do_trans(m, trans);
if (trans_len > SPCOM_TRANLEN_MAX)
trans_len = SPCOM_TRANLEN_MAX;
/* Update device offset */
if (pos > 0) {
addr = fsl_espi_cmd2addr(local_buf);
addr += rx_pos;
fsl_espi_addr2cmd(addr, local_buf);
}
espi_trans->len = trans_len;
espi_trans->tx_buf = local_buf;
espi_trans->rx_buf = local_buf;
fsl_espi_do_trans(m, espi_trans);
/* If there is at least one RX byte then copy it to rx_buf */
if (tx_only < SPCOM_TRANLEN_MAX)
memcpy(rx_buf + rx_pos, espi_trans->rx_buf + tx_only,
trans_len - tx_only);
rx_pos += trans_len - tx_only;
if (loop > 0)
espi_trans->actual_length += espi_trans->len - tx_only;
else
espi_trans->actual_length += espi_trans->len;
if (!trans->status) {
/* If there is at least one RX byte then copy it to rx_buff */
if (trans->len > tx_only)
memcpy(rx_buff, trans->rx_buf + tx_only,
trans->len - tx_only);
trans->actual_length += trans->len;
}
kfree(local_buf);
@ -663,7 +614,7 @@ static int fsl_espi_runtime_resume(struct device *dev)
}
#endif
static size_t fsl_espi_max_transfer_size(struct spi_device *spi)
static size_t fsl_espi_max_message_size(struct spi_device *spi)
{
return SPCOM_TRANLEN_MAX;
}
@ -695,7 +646,7 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
master->cleanup = fsl_espi_cleanup;
master->transfer_one_message = fsl_espi_do_one_msg;
master->auto_runtime_pm = true;
master->max_transfer_size = fsl_espi_max_transfer_size;
master->max_message_size = fsl_espi_max_message_size;
mpc8xxx_spi = spi_master_get_devdata(master);