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authorHiep Cao Minh <cm-hiep@jinso.co.jp>2014-10-23 05:14:13 +0200
committerMark Brown <broonie@kernel.org>2015-03-30 06:29:35 +0200
commit4b6fe3edcbbaa3d0e5513adcb9577c7e184ad1b5 (patch)
treedae20d850e5977c1f6a5d8ac103494f99a31c846
parentLinux 4.0-rc1 (diff)
downloadlinux-4b6fe3edcbbaa3d0e5513adcb9577c7e184ad1b5.tar.xz
linux-4b6fe3edcbbaa3d0e5513adcb9577c7e184ad1b5.zip
spi: Using Trigger number to transmit/receive data
In order to transmit and receive data when have 32 bytes of data that ready has prepared on Transmit/Receive Buffer to transmit or receive. Instead transmits/receives a byte data using Transmit/Receive Buffer Data Triggering Number will improve the speed of transfer data. Signed-off-by: Hiep Cao Minh <cm-hiep@jinso.co.jp> Signed-off-by: Mark Brown <broonie@kernel.org>
-rw-r--r--drivers/spi/spi-rspi.c124
1 files changed, 117 insertions, 7 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c
index 46ce47076e63..fd276f990d4d 100644
--- a/drivers/spi/spi-rspi.c
+++ b/drivers/spi/spi-rspi.c
@@ -177,6 +177,13 @@
#define SPBFCR_RXRST 0x40 /* Receive Buffer Data Reset */
#define SPBFCR_TXTRG_MASK 0x30 /* Transmit Buffer Data Triggering Number */
#define SPBFCR_RXTRG_MASK 0x07 /* Receive Buffer Data Triggering Number */
+/* QSPI on R-Car Gen2 */
+#define SPBFCR_TXTRG_1B 0x00 /* 31 bytes (1 byte available) */
+#define SPBFCR_TXTRG_32B 0x30 /* 0 byte (32 bytes available) */
+#define SPBFCR_RXTRG_1B 0x00 /* 1 byte (31 bytes available) */
+#define SPBFCR_RXTRG_32B 0x07 /* 32 bytes (0 byte available) */
+
+#define QSPI_BUFFER_SIZE 32u
struct rspi_data {
void __iomem *addr;
@@ -366,6 +373,52 @@ static int qspi_set_config_register(struct rspi_data *rspi, int access_size)
return 0;
}
+static void qspi_update(const struct rspi_data *rspi, u8 mask, u8 val, u8 reg)
+{
+ u8 data;
+
+ data = rspi_read8(rspi, reg);
+ data &= ~mask;
+ data |= (val & mask);
+ rspi_write8(rspi, data, reg);
+}
+
+static int qspi_set_send_trigger(struct rspi_data *rspi, unsigned int len)
+{
+ unsigned int n;
+
+ n = min(len, QSPI_BUFFER_SIZE);
+
+ if (len >= QSPI_BUFFER_SIZE) {
+ /* sets triggering number to 32 bytes */
+ qspi_update(rspi, SPBFCR_TXTRG_MASK,
+ SPBFCR_TXTRG_32B, QSPI_SPBFCR);
+ } else {
+ /* sets triggering number to 1 byte */
+ qspi_update(rspi, SPBFCR_TXTRG_MASK,
+ SPBFCR_TXTRG_1B, QSPI_SPBFCR);
+ }
+
+ return n;
+}
+
+static void qspi_set_receive_trigger(struct rspi_data *rspi, unsigned int len)
+{
+ unsigned int n;
+
+ n = min(len, QSPI_BUFFER_SIZE);
+
+ if (len >= QSPI_BUFFER_SIZE) {
+ /* sets triggering number to 32 bytes */
+ qspi_update(rspi, SPBFCR_RXTRG_MASK,
+ SPBFCR_RXTRG_32B, QSPI_SPBFCR);
+ } else {
+ /* sets triggering number to 1 byte */
+ qspi_update(rspi, SPBFCR_RXTRG_MASK,
+ SPBFCR_RXTRG_1B, QSPI_SPBFCR);
+ }
+}
+
#define set_config_register(spi, n) spi->ops->set_config_register(spi, n)
static void rspi_enable_irq(const struct rspi_data *rspi, u8 enable)
@@ -609,19 +662,29 @@ static bool rspi_can_dma(struct spi_master *master, struct spi_device *spi,
return __rspi_can_dma(rspi, xfer);
}
-static int rspi_common_transfer(struct rspi_data *rspi,
- struct spi_transfer *xfer)
+static int rspi_dma_check_then_transfer(struct rspi_data *rspi,
+ struct spi_transfer *xfer)
{
- int ret;
-
if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) {
/* rx_buf can be NULL on RSPI on SH in TX-only Mode */
- ret = rspi_dma_transfer(rspi, &xfer->tx_sg,
+ int ret = rspi_dma_transfer(rspi, &xfer->tx_sg,
xfer->rx_buf ? &xfer->rx_sg : NULL);
if (ret != -EAGAIN)
- return ret;
+ return 0;
}
+ return -EAGAIN;
+}
+
+static int rspi_common_transfer(struct rspi_data *rspi,
+ struct spi_transfer *xfer)
+{
+ int ret;
+
+ ret = rspi_dma_check_then_transfer(rspi, xfer);
+ if (ret != -EAGAIN)
+ return ret;
+
ret = rspi_pio_transfer(rspi, xfer->tx_buf, xfer->rx_buf, xfer->len);
if (ret < 0)
return ret;
@@ -661,12 +724,59 @@ static int rspi_rz_transfer_one(struct spi_master *master,
return rspi_common_transfer(rspi, xfer);
}
+static int qspi_trigger_transfer_out_int(struct rspi_data *rspi, const u8 *tx,
+ u8 *rx, unsigned int len)
+{
+ unsigned int i, n, ret;
+ int error;
+
+ while (len > 0) {
+ n = qspi_set_send_trigger(rspi, len);
+ qspi_set_receive_trigger(rspi, len);
+ if (n == QSPI_BUFFER_SIZE) {
+ error = rspi_wait_for_tx_empty(rspi);
+ if (error < 0) {
+ dev_err(&rspi->master->dev, "transmit timeout\n");
+ return error;
+ }
+ for (i = 0; i < n; i++)
+ rspi_write_data(rspi, *tx++);
+
+ error = rspi_wait_for_rx_full(rspi);
+ if (error < 0) {
+ dev_err(&rspi->master->dev, "receive timeout\n");
+ return error;
+ }
+ for (i = 0; i < n; i++)
+ *rx++ = rspi_read_data(rspi);
+ } else {
+ ret = rspi_pio_transfer(rspi, tx, rx, n);
+ if (ret < 0)
+ return ret;
+ }
+ len -= n;
+ }
+
+ return 0;
+}
+
static int qspi_transfer_out_in(struct rspi_data *rspi,
struct spi_transfer *xfer)
{
+ int ret;
+
qspi_receive_init(rspi);
- return rspi_common_transfer(rspi, xfer);
+ ret = rspi_dma_check_then_transfer(rspi, xfer);
+ if (ret != -EAGAIN)
+ return ret;
+
+ ret = qspi_trigger_transfer_out_int(rspi, xfer->tx_buf,
+ xfer->rx_buf, xfer->len);
+ if (ret < 0)
+ return ret;
+
+ return 0;
}
static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)