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spi: rspi: supports 32bytes buffer for DUAL and QUAD 

This patch supports 32bytes of buffer for DUAL and QUAD in QSPI by
Using Transmit/Receive Buffer Data Triggering Number.
In order to improve the DUAL and QUAD's performance of SPI
while transferring data in PIO mode, it sends/receives each 32bytes
data instead of each byte data as current situation.

Signed-off-by: Hiep Cao Minh <cm-hiep@jinso.co.jp>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Hiep Cao Minh 2016-11-04 17:38:54 +09:00 committed by Mark Brown
parent 1001354ca3
commit 3be09bec42
1 changed files with 49 additions and 3 deletions
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52
drivers/spi/spi-rspi.c
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@ -413,7 +413,7 @@ static unsigned int qspi_set_send_trigger(struct rspi_data *rspi,
return n;
}
static void qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
static int qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
{
unsigned int n;
@ -428,6 +428,7 @@ static void qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
qspi_update(rspi, SPBFCR_RXTRG_MASK,
SPBFCR_RXTRG_1B, QSPI_SPBFCR);
}
return n;
}
#define set_config_register(spi, n) spi->ops->set_config_register(spi, n)
@ -514,6 +515,51 @@ static int rspi_pio_transfer(struct rspi_data *rspi, const u8 *tx, u8 *rx,
return 0;
}
static int rspi_pio_transfer_in_or_our(struct rspi_data *rspi, const u8 *tx,
u8 *rx, unsigned int n)
{
unsigned int i, len;
int ret;
while (n > 0) {
if (tx) {
len = qspi_set_send_trigger(rspi, n);
if (len == QSPI_BUFFER_SIZE) {
ret = rspi_wait_for_tx_empty(rspi);
if (ret < 0) {
dev_err(&rspi->master->dev, "transmit timeout\n");
return ret;
}
for (i = 0; i < len; i++)
rspi_write_data(rspi, *tx++);
} else {
ret = rspi_pio_transfer(rspi, tx, NULL, n);
if (ret < 0)
return ret;
}
}
if (rx) {
len = qspi_set_receive_trigger(rspi, n);
if (len == QSPI_BUFFER_SIZE) {
ret = rspi_wait_for_rx_full(rspi);
if (ret < 0) {
dev_err(&rspi->master->dev, "receive timeout\n");
return ret;
}
for (i = 0; i < len; i++)
*rx++ = rspi_read_data(rspi);
} else {
ret = rspi_pio_transfer(rspi, NULL, rx, n);
if (ret < 0)
return ret;
*rx++ = ret;
}
}
n -= len;
}
return 0;
}
static void rspi_dma_complete(void *arg)
{
struct rspi_data *rspi = arg;
@ -793,7 +839,7 @@ static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
return ret;
}
ret = rspi_pio_transfer(rspi, xfer->tx_buf, NULL, xfer->len);
ret = rspi_pio_transfer_in_or_our(rspi, xfer->tx_buf, NULL, xfer->len);
if (ret < 0)
return ret;
@ -811,7 +857,7 @@ static int qspi_transfer_in(struct rspi_data *rspi, struct spi_transfer *xfer)
return ret;
}
return rspi_pio_transfer(rspi, NULL, xfer->rx_buf, xfer->len);
return rspi_pio_transfer_in_or_our(rspi, NULL, xfer->rx_buf, xfer->len);
}
static int qspi_transfer_one(struct spi_master *master, struct spi_device *spi,