From 3be09bec42a800d4f8ead8119c462f3eb4fad435 Mon Sep 17 00:00:00 2001 From: Hiep Cao Minh Date: Fri, 4 Nov 2016 17:38:54 +0900 Subject: 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 Signed-off-by: Mark Brown --- drivers/spi/spi-rspi.c | 52 +++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 49 insertions(+), 3 deletions(-) (limited to 'drivers/spi/spi-rspi.c') diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index a816f07e168e..3bab75ab1b25 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -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, -- cgit v1.2.3