diff options
Diffstat (limited to 'drivers/spi/spi-fsl-dspi.c')
| -rw-r--r-- | drivers/spi/spi-fsl-dspi.c | 160 |
1 files changed, 135 insertions, 25 deletions
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 298c22def165..f5b802070d29 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -228,8 +228,6 @@ struct fsl_dspi { const void *tx; void *rx; u16 tx_cmd; - u8 bits_per_word; - u8 bytes_per_word; const struct fsl_dspi_devtype_data *devtype_data; wait_queue_head_t waitq; @@ -237,9 +235,70 @@ struct fsl_dspi { struct fsl_dspi_dma *dma; + int oper_word_size; + int oper_bits_per_word; + int words_in_flight; + + void (*host_to_dev)(struct fsl_dspi *dspi, u32 *txdata); + void (*dev_to_host)(struct fsl_dspi *dspi, u32 rxdata); }; +static void dspi_native_host_to_dev(struct fsl_dspi *dspi, u32 *txdata) +{ + memcpy(txdata, dspi->tx, dspi->oper_word_size); + dspi->tx += dspi->oper_word_size; +} + +static void dspi_native_dev_to_host(struct fsl_dspi *dspi, u32 rxdata) +{ + memcpy(dspi->rx, &rxdata, dspi->oper_word_size); + dspi->rx += dspi->oper_word_size; +} + +static void dspi_8on32_host_to_dev(struct fsl_dspi *dspi, u32 *txdata) +{ + *txdata = cpu_to_be32(*(u32 *)dspi->tx); + dspi->tx += sizeof(u32); +} + +static void dspi_8on32_dev_to_host(struct fsl_dspi *dspi, u32 rxdata) +{ + *(u32 *)dspi->rx = be32_to_cpu(rxdata); + dspi->rx += sizeof(u32); +} + +static void dspi_8on16_host_to_dev(struct fsl_dspi *dspi, u32 *txdata) +{ + *txdata = cpu_to_be16(*(u16 *)dspi->tx); + dspi->tx += sizeof(u16); +} + +static void dspi_8on16_dev_to_host(struct fsl_dspi *dspi, u32 rxdata) +{ + *(u16 *)dspi->rx = be16_to_cpu(rxdata); + dspi->rx += sizeof(u16); +} + +static void dspi_16on32_host_to_dev(struct fsl_dspi *dspi, u32 *txdata) +{ + u16 hi = *(u16 *)dspi->tx; + u16 lo = *(u16 *)(dspi->tx + 2); + + *txdata = (u32)hi << 16 | lo; + dspi->tx += sizeof(u32); +} + +static void dspi_16on32_dev_to_host(struct fsl_dspi *dspi, u32 rxdata) +{ + u16 hi = rxdata & 0xffff; + u16 lo = rxdata >> 16; + + *(u16 *)dspi->rx = lo; + *(u16 *)(dspi->rx + 2) = hi; + dspi->rx += sizeof(u32); +} + /* * Pop one word from the TX buffer for pushing into the * PUSHR register (TX FIFO) @@ -248,11 +307,9 @@ static u32 dspi_pop_tx(struct fsl_dspi *dspi) { u32 txdata = 0; - if (dspi->tx) { - memcpy(&txdata, dspi->tx, dspi->bytes_per_word); - dspi->tx += dspi->bytes_per_word; - } - dspi->len -= dspi->bytes_per_word; + if (dspi->tx) + dspi->host_to_dev(dspi, &txdata); + dspi->len -= dspi->oper_word_size; return txdata; } @@ -274,9 +331,7 @@ static void dspi_push_rx(struct fsl_dspi *dspi, u32 rxdata) { if (!dspi->rx) return; - - memcpy(dspi->rx, &rxdata, dspi->bytes_per_word); - dspi->rx += dspi->bytes_per_word; + dspi->dev_to_host(dspi, rxdata); } static void dspi_tx_dma_callback(void *arg) @@ -393,8 +448,8 @@ static int dspi_dma_xfer(struct fsl_dspi *dspi) dspi->devtype_data->fifo_size; while (curr_remaining_bytes) { /* Check if current transfer fits the DMA buffer */ - dma->curr_xfer_len = curr_remaining_bytes - / dspi->bytes_per_word; + dma->curr_xfer_len = curr_remaining_bytes / + dspi->oper_word_size; if (dma->curr_xfer_len > bytes_per_buffer) dma->curr_xfer_len = bytes_per_buffer; @@ -404,8 +459,8 @@ static int dspi_dma_xfer(struct fsl_dspi *dspi) goto exit; } else { - const int len = - dma->curr_xfer_len * dspi->bytes_per_word; + const int len = dma->curr_xfer_len * + dspi->oper_word_size; curr_remaining_bytes -= len; message->actual_length += len; if (curr_remaining_bytes < 0) @@ -615,7 +670,7 @@ static void dspi_pushr_cmd_write(struct fsl_dspi *dspi) * generate a new PUSHR command with the final word that will have PCS * deasserted (not continued) here. */ - if (dspi->len > dspi->bytes_per_word) + if (dspi->len > dspi->oper_word_size) cmd |= SPI_PUSHR_CMD_CONT; regmap_write(dspi->regmap_pushr, PUSHR_CMD, cmd); } @@ -627,8 +682,9 @@ static void dspi_pushr_txdata_write(struct fsl_dspi *dspi, u16 txdata) static void dspi_xspi_write(struct fsl_dspi *dspi, int cnt) { + /* Update CTARE */ regmap_write(dspi->regmap, SPI_CTARE(0), - SPI_FRAME_EBITS(dspi->bits_per_word) | + SPI_FRAME_EBITS(dspi->oper_bits_per_word) | SPI_CTARE_DTCP(cnt)); /* @@ -642,7 +698,7 @@ static void dspi_xspi_write(struct fsl_dspi *dspi, int cnt) u32 data = dspi_pop_tx(dspi); dspi_pushr_txdata_write(dspi, data & 0xFFFF); - if (dspi->bits_per_word > 16) + if (dspi->oper_bits_per_word > 16) dspi_pushr_txdata_write(dspi, data >> 16); } } @@ -653,15 +709,20 @@ static void dspi_xspi_fifo_write(struct fsl_dspi *dspi) int bytes_in_flight; /* In XSPI mode each 32-bit word occupies 2 TX FIFO entries */ - if (dspi->bits_per_word > 16) + if (dspi->oper_word_size == 4) num_fifo_entries /= 2; - dspi->words_in_flight = dspi->len / dspi->bytes_per_word; + /* + * Integer division intentionally trims off odd (or non-multiple of 4) + * numbers of bytes at the end of the buffer, which will be sent next + * time using a smaller oper_word_size. + */ + dspi->words_in_flight = dspi->len / dspi->oper_word_size; if (dspi->words_in_flight > num_fifo_entries) dspi->words_in_flight = num_fifo_entries; - bytes_in_flight = dspi->words_in_flight * dspi->bytes_per_word; + bytes_in_flight = dspi->words_in_flight * dspi->oper_word_size; /* * If the PCS needs to de-assert (i.e. we're at the end of the buffer @@ -689,7 +750,7 @@ static void dspi_eoq_fifo_write(struct fsl_dspi *dspi) while (dspi->len && num_fifo_entries--) { dspi->tx_cmd = xfer_cmd; /* Request EOQF for last transfer in FIFO */ - if (dspi->len == dspi->bytes_per_word || num_fifo_entries == 0) + if (dspi->len == dspi->oper_word_size || num_fifo_entries == 0) dspi->tx_cmd |= SPI_PUSHR_CMD_EOQ; /* Write combined TX FIFO and CMD FIFO entry */ dspi_pushr_write(dspi); @@ -711,8 +772,56 @@ static void dspi_fifo_read(struct fsl_dspi *dspi) dspi_push_rx(dspi, dspi_popr_read(dspi)); } +static void dspi_setup_accel(struct fsl_dspi *dspi) +{ + struct spi_transfer *xfer = dspi->cur_transfer; + + /* Start off with maximum supported by hardware */ + if (dspi->devtype_data->trans_mode == DSPI_XSPI_MODE) + dspi->oper_bits_per_word = 32; + else + dspi->oper_bits_per_word = 16; + + /* And go down only if the buffer can't be sent with words this big */ + do { + if (dspi->len >= DIV_ROUND_UP(dspi->oper_bits_per_word, 8)) + break; + + dspi->oper_bits_per_word /= 2; + } while (dspi->oper_bits_per_word > 8); + + if (xfer->bits_per_word == 8 && dspi->oper_bits_per_word == 32) { + dspi->dev_to_host = dspi_8on32_dev_to_host; + dspi->host_to_dev = dspi_8on32_host_to_dev; + } else if (xfer->bits_per_word == 8 && dspi->oper_bits_per_word == 16) { + dspi->dev_to_host = dspi_8on16_dev_to_host; + dspi->host_to_dev = dspi_8on16_host_to_dev; + } else if (xfer->bits_per_word == 16 && dspi->oper_bits_per_word == 32) { + dspi->dev_to_host = dspi_16on32_dev_to_host; + dspi->host_to_dev = dspi_16on32_host_to_dev; + } else { + /* No acceleration needed (8<N<=16 on 16, 16<N<=32 on 32) */ + dspi->dev_to_host = dspi_native_dev_to_host; + dspi->host_to_dev = dspi_native_host_to_dev; + dspi->oper_bits_per_word = xfer->bits_per_word; + } + + dspi->oper_word_size = DIV_ROUND_UP(dspi->oper_bits_per_word, 8); + + /* + * Update CTAR here (code is common for both EOQ and XSPI modes). + * We will update CTARE in the portion specific to XSPI, when we + * also know the preload value (DTCP). + */ + regmap_write(dspi->regmap, SPI_CTAR(0), + dspi->cur_chip->ctar_val | + SPI_FRAME_BITS(dspi->oper_bits_per_word)); +} + static void dspi_fifo_write(struct fsl_dspi *dspi) { + dspi_setup_accel(dspi); + if (dspi->devtype_data->trans_mode == DSPI_EOQ_MODE) dspi_eoq_fifo_write(dspi); else @@ -726,7 +835,7 @@ static int dspi_rxtx(struct fsl_dspi *dspi) int bytes_sent; /* Update total number of bytes that were transferred */ - bytes_sent = dspi->words_in_flight * dspi->bytes_per_word; + bytes_sent = dspi->words_in_flight * dspi->oper_word_size; msg->actual_length += bytes_sent; dspi->progress += bytes_sent / DIV_ROUND_UP(xfer->bits_per_word, 8); @@ -824,13 +933,14 @@ static int dspi_transfer_one_message(struct spi_controller *ctlr, dspi->rx = transfer->rx_buf; dspi->len = transfer->len; dspi->progress = 0; - /* Validated transfer specific frame size (defaults applied) */ - dspi->bits_per_word = transfer->bits_per_word; - dspi->bytes_per_word = DIV_ROUND_UP(dspi->bits_per_word, 8); regmap_update_bits(dspi->regmap, SPI_MCR, SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF, SPI_MCR_CLR_TXF | SPI_MCR_CLR_RXF); + /* + * Static CTAR setup for modes that don't dynamically adjust it + * via dspi_setup_accel (aka for DMA) + */ regmap_write(dspi->regmap, SPI_CTAR(0), dspi->cur_chip->ctar_val | SPI_FRAME_BITS(transfer->bits_per_word)); 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