diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi-rspi.c | 95 |
1 files changed, 93 insertions, 2 deletions
diff --git a/drivers/spi/spi-rspi.c b/drivers/spi/spi-rspi.c index 4c8dbac11b42..58449ad4ad0d 100644 --- a/drivers/spi/spi-rspi.c +++ b/drivers/spi/spi-rspi.c @@ -198,6 +198,11 @@ static u16 rspi_read16(struct rspi_data *rspi, u16 offset) /* optional functions */ struct spi_ops { int (*set_config_register)(struct rspi_data *rspi, int access_size); + int (*send_pio)(struct rspi_data *rspi, struct spi_message *mesg, + struct spi_transfer *t); + int (*receive_pio)(struct rspi_data *rspi, struct spi_message *mesg, + struct spi_transfer *t); + }; /* @@ -349,6 +354,43 @@ static int rspi_send_pio(struct rspi_data *rspi, struct spi_message *mesg, return 0; } +static int qspi_send_pio(struct rspi_data *rspi, struct spi_message *mesg, + struct spi_transfer *t) +{ + int remain = t->len; + u8 *data; + + rspi_write8(rspi, SPBFCR_TXRST, QSPI_SPBFCR); + rspi_write8(rspi, 0x00, QSPI_SPBFCR); + + data = (u8 *)t->tx_buf; + while (remain > 0) { + + if (rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE) < 0) { + dev_err(&rspi->master->dev, + "%s: tx empty timeout\n", __func__); + return -ETIMEDOUT; + } + rspi_write8(rspi, *data++, RSPI_SPDR); + + if (rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE) < 0) { + dev_err(&rspi->master->dev, + "%s: receive timeout\n", __func__); + return -ETIMEDOUT; + } + rspi_read8(rspi, RSPI_SPDR); + + remain--; + } + + /* Waiting for the last transmition */ + rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE); + + return 0; +} + +#define send_pio(spi, mesg, t) spi->ops->send_pio(spi, mesg, t) + static void rspi_dma_complete(void *arg) { struct rspi_data *rspi = arg; @@ -514,6 +556,51 @@ static int rspi_receive_pio(struct rspi_data *rspi, struct spi_message *mesg, return 0; } +static void qspi_receive_init(struct rspi_data *rspi) +{ + unsigned char spsr; + + spsr = rspi_read8(rspi, RSPI_SPSR); + if (spsr & SPSR_SPRF) + rspi_read8(rspi, RSPI_SPDR); /* dummy read */ + rspi_write8(rspi, SPBFCR_TXRST | SPBFCR_RXRST, QSPI_SPBFCR); + rspi_write8(rspi, 0x00, QSPI_SPBFCR); +} + +static int qspi_receive_pio(struct rspi_data *rspi, struct spi_message *mesg, + struct spi_transfer *t) +{ + int remain = t->len; + u8 *data; + + qspi_receive_init(rspi); + + data = (u8 *)t->rx_buf; + while (remain > 0) { + + if (rspi_wait_for_interrupt(rspi, SPSR_SPTEF, SPCR_SPTIE) < 0) { + dev_err(&rspi->master->dev, + "%s: tx empty timeout\n", __func__); + return -ETIMEDOUT; + } + /* dummy write for generate clock */ + rspi_write8(rspi, 0x00, RSPI_SPDR); + + if (rspi_wait_for_interrupt(rspi, SPSR_SPRF, SPCR_SPRIE) < 0) { + dev_err(&rspi->master->dev, + "%s: receive timeout\n", __func__); + return -ETIMEDOUT; + } + /* SPDR allows 8, 16 or 32-bit access */ + *data++ = rspi_read8(rspi, RSPI_SPDR); + remain--; + } + + return 0; +} + +#define receive_pio(spi, mesg, t) spi->ops->receive_pio(spi, mesg, t) + static int rspi_receive_dma(struct rspi_data *rspi, struct spi_transfer *t) { struct scatterlist sg, sg_dummy; @@ -653,7 +740,7 @@ static void rspi_work(struct work_struct *work) if (rspi_is_dma(rspi, t)) ret = rspi_send_dma(rspi, t); else - ret = rspi_send_pio(rspi, mesg, t); + ret = send_pio(rspi, mesg, t); if (ret < 0) goto error; } @@ -661,7 +748,7 @@ static void rspi_work(struct work_struct *work) if (rspi_is_dma(rspi, t)) ret = rspi_receive_dma(rspi, t); else - ret = rspi_receive_pio(rspi, mesg, t); + ret = receive_pio(rspi, mesg, t); if (ret < 0) goto error; } @@ -918,10 +1005,14 @@ error1: static struct spi_ops rspi_ops = { .set_config_register = rspi_set_config_register, + .send_pio = rspi_send_pio, + .receive_pio = rspi_receive_pio, }; static struct spi_ops qspi_ops = { .set_config_register = qspi_set_config_register, + .send_pio = qspi_send_pio, + .receive_pio = qspi_receive_pio, }; static struct platform_device_id spi_driver_ids[] = { |