| Message ID | 20221212180732.79167-6-sudip.mukherjee@sifive.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add support for enhanced SPI for Designware SPI controllers | expand |
On Mon, Dec 12, 2022 at 06:07:22PM +0000, Sudip Mukherjee wrote: > If the DW_SPI_CAP_EMODE capability is enabled then dw_spi_exec_enh_mem_op() > will be used as the new enhanced mem_op. Lets initialize the buffer and > get the pointers to receive and transmit data buffers. > The DW_SPI_CAP_EMODE capability will be enabled in a later patch. > > Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com> > --- > drivers/spi/spi-dw-core.c | 53 ++++++++++++++++++++++++++++++++++++--- > 1 file changed, 50 insertions(+), 3 deletions(-) > > diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c > index 49fad58ceb94a..89438ae2df17d 100644 > --- a/drivers/spi/spi-dw-core.c > +++ b/drivers/spi/spi-dw-core.c > @@ -798,6 +798,51 @@ static int dw_spi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) > return ret; > } > > +static void dw_spi_init_enh_mem_buf(struct dw_spi *dws, const struct spi_mem_op *op) > +{ > + unsigned int i, j; > + u8 *out; > + > + out = dws->buf; > + for (i = 0; i < DW_SPI_BUF_SIZE; ++i) > + out[i] = 0; > + > + for (i = 0, j = op->cmd.nbytes; i < op->cmd.nbytes; ++i, --j) > + out[i] = DW_SPI_GET_BYTE(op->cmd.opcode, op->cmd.nbytes - j); > + > + for (j = op->addr.nbytes, i = dws->reg_io_width; j > 0; ++i, --j) > + out[i] = DW_SPI_GET_BYTE(op->addr.val, op->addr.nbytes - j); In case of the non-eSPI implementation the outbound data consolidation was required to get the most optimal loop of data transfer. In this case I don't see it was required since the clock stretching feature is available and the IRQ-based xfer procedure is implemented. Do I miss something? -Serge(y) > + > + dws->n_bytes = 1; > + if (op->data.dir == SPI_MEM_DATA_IN) { > + dws->rx = op->data.buf.in; > + dws->rx_len = op->data.nbytes; > + dws->tx = NULL; > + dws->tx_len = 0; > + } else if (op->data.dir == SPI_MEM_DATA_OUT) { > + dws->tx_len = op->data.nbytes; > + dws->tx = (void *)op->data.buf.out; > + dws->rx = NULL; > + dws->rx_len = 0; > + } else { > + dws->rx = NULL; > + dws->rx_len = 0; > + dws->tx = NULL; > + dws->tx_len = 0; > + } > +} > + > +static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) > +{ > + struct spi_controller *ctlr = mem->spi->controller; > + struct dw_spi *dws = spi_controller_get_devdata(ctlr); > + > + /* Collect cmd and addr into a single buffer */ > + dw_spi_init_enh_mem_buf(dws, op); > + > + return 0; > +} > + > /* > * Initialize the default memory operations if a glue layer hasn't specified > * custom ones. Direct mapping operations will be preserved anyway since DW SPI > @@ -812,11 +857,13 @@ static void dw_spi_init_mem_ops(struct dw_spi *dws) > if (!dws->mem_ops.exec_op && !(dws->caps & DW_SPI_CAP_CS_OVERRIDE) && > !dws->set_cs) { > dws->mem_ops.adjust_op_size = dw_spi_adjust_mem_op_size; > - if (dws->caps & DW_SPI_CAP_EMODE) > + if (dws->caps & DW_SPI_CAP_EMODE) { > + dws->mem_ops.exec_op = dw_spi_exec_enh_mem_op; > dws->mem_ops.supports_op = dw_spi_supports_enh_mem_op; > - else > + } else { > + dws->mem_ops.exec_op = dw_spi_exec_mem_op; > dws->mem_ops.supports_op = dw_spi_supports_mem_op; > - dws->mem_ops.exec_op = dw_spi_exec_mem_op; > + } > if (!dws->max_mem_freq) > dws->max_mem_freq = dws->max_freq; > } > -- > 2.30.2 >
diff --git a/drivers/spi/spi-dw-core.c b/drivers/spi/spi-dw-core.c index 49fad58ceb94a..89438ae2df17d 100644 --- a/drivers/spi/spi-dw-core.c +++ b/drivers/spi/spi-dw-core.c @@ -798,6 +798,51 @@ static int dw_spi_exec_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) return ret; } +static void dw_spi_init_enh_mem_buf(struct dw_spi *dws, const struct spi_mem_op *op) +{ + unsigned int i, j; + u8 *out; + + out = dws->buf; + for (i = 0; i < DW_SPI_BUF_SIZE; ++i) + out[i] = 0; + + for (i = 0, j = op->cmd.nbytes; i < op->cmd.nbytes; ++i, --j) + out[i] = DW_SPI_GET_BYTE(op->cmd.opcode, op->cmd.nbytes - j); + + for (j = op->addr.nbytes, i = dws->reg_io_width; j > 0; ++i, --j) + out[i] = DW_SPI_GET_BYTE(op->addr.val, op->addr.nbytes - j); + + dws->n_bytes = 1; + if (op->data.dir == SPI_MEM_DATA_IN) { + dws->rx = op->data.buf.in; + dws->rx_len = op->data.nbytes; + dws->tx = NULL; + dws->tx_len = 0; + } else if (op->data.dir == SPI_MEM_DATA_OUT) { + dws->tx_len = op->data.nbytes; + dws->tx = (void *)op->data.buf.out; + dws->rx = NULL; + dws->rx_len = 0; + } else { + dws->rx = NULL; + dws->rx_len = 0; + dws->tx = NULL; + dws->tx_len = 0; + } +} + +static int dw_spi_exec_enh_mem_op(struct spi_mem *mem, const struct spi_mem_op *op) +{ + struct spi_controller *ctlr = mem->spi->controller; + struct dw_spi *dws = spi_controller_get_devdata(ctlr); + + /* Collect cmd and addr into a single buffer */ + dw_spi_init_enh_mem_buf(dws, op); + + return 0; +} + /* * Initialize the default memory operations if a glue layer hasn't specified * custom ones. Direct mapping operations will be preserved anyway since DW SPI @@ -812,11 +857,13 @@ static void dw_spi_init_mem_ops(struct dw_spi *dws) if (!dws->mem_ops.exec_op && !(dws->caps & DW_SPI_CAP_CS_OVERRIDE) && !dws->set_cs) { dws->mem_ops.adjust_op_size = dw_spi_adjust_mem_op_size; - if (dws->caps & DW_SPI_CAP_EMODE) + if (dws->caps & DW_SPI_CAP_EMODE) { + dws->mem_ops.exec_op = dw_spi_exec_enh_mem_op; dws->mem_ops.supports_op = dw_spi_supports_enh_mem_op; - else + } else { + dws->mem_ops.exec_op = dw_spi_exec_mem_op; dws->mem_ops.supports_op = dw_spi_supports_mem_op; - dws->mem_ops.exec_op = dw_spi_exec_mem_op; + } if (!dws->max_mem_freq) dws->max_mem_freq = dws->max_freq; }
If the DW_SPI_CAP_EMODE capability is enabled then dw_spi_exec_enh_mem_op() will be used as the new enhanced mem_op. Lets initialize the buffer and get the pointers to receive and transmit data buffers. The DW_SPI_CAP_EMODE capability will be enabled in a later patch. Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com> --- drivers/spi/spi-dw-core.c | 53 ++++++++++++++++++++++++++++++++++++--- 1 file changed, 50 insertions(+), 3 deletions(-)