diff options
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/mxs_spi.c | 39 |
1 files changed, 19 insertions, 20 deletions
diff --git a/drivers/spi/mxs_spi.c b/drivers/spi/mxs_spi.c index bb865b7..ffa3c1d 100644 --- a/drivers/spi/mxs_spi.c +++ b/drivers/spi/mxs_spi.c @@ -40,17 +40,6 @@ #define MXSSSP_SMALL_TRANSFER 512 -/* - * CONFIG_MXS_SPI_DMA_ENABLE: Experimental mixed PIO/DMA support for MXS SPI - * host. Use with utmost caution! - * - * Enabling this is not yet recommended since this - * still doesn't support transfers to/from unaligned - * addresses. Therefore this driver will not work - * for example with saving environment. This is - * caused by DMA alignment constraints on MXS. - */ - struct mxs_spi_slave { struct spi_slave slave; uint32_t max_khz; @@ -70,7 +59,7 @@ void spi_init(void) int spi_cs_is_valid(unsigned int bus, unsigned int cs) { /* MXS SPI: 4 ports and 3 chip selects maximum */ - if (bus > 3 || cs > 2) + if (!mxs_ssp_bus_id_valid(bus) || cs > 2) return 0; else return 1; @@ -92,7 +81,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, if (!mxs_slave) return NULL; - if (mxs_dma_init_channel(bus)) + if (mxs_dma_init_channel(MXS_DMA_CHANNEL_AHB_APBH_SSP0 + bus)) goto err_init; mxs_slave->slave.bus = bus; @@ -168,7 +157,12 @@ static int mxs_spi_xfer_pio(struct mxs_spi_slave *slave, while (length--) { /* We transfer 1 byte */ +#if defined(CONFIG_MX23) + writel(SSP_CTRL0_XFER_COUNT_MASK, &ssp_regs->hw_ssp_ctrl0_clr); + writel(1, &ssp_regs->hw_ssp_ctrl0_set); +#elif defined(CONFIG_MX28) writel(1, &ssp_regs->hw_ssp_xfer_size); +#endif if ((flags & SPI_XFER_END) && !length) mxs_spi_end_xfer(ssp_regs); @@ -226,6 +220,12 @@ static int mxs_spi_xfer_dma(struct mxs_spi_slave *slave, int tl; int ret = 0; +#if defined(CONFIG_MX23) + const int mxs_spi_pio_words = 1; +#elif defined(CONFIG_MX28) + const int mxs_spi_pio_words = 4; +#endif + ALLOC_CACHE_ALIGN_BUFFER(struct mxs_dma_desc, desc, desc_count); memset(desc, 0, sizeof(struct mxs_dma_desc) * desc_count); @@ -281,7 +281,7 @@ static int mxs_spi_xfer_dma(struct mxs_spi_slave *slave, dp->cmd.data |= ((tl & 0xffff) << MXS_DMA_DESC_BYTES_OFFSET) | - (4 << MXS_DMA_DESC_PIO_WORDS_OFFSET) | + (mxs_spi_pio_words << MXS_DMA_DESC_PIO_WORDS_OFFSET) | MXS_DMA_DESC_HALT_ON_TERMINATE | MXS_DMA_DESC_TERMINATE_FLUSH; @@ -298,15 +298,19 @@ static int mxs_spi_xfer_dma(struct mxs_spi_slave *slave, } /* - * Write CTRL0, CMD0, CMD1, XFER_SIZE registers. It is + * Write CTRL0, CMD0, CMD1 and XFER_SIZE registers in + * case of MX28, write only CTRL0 in case of MX23 due + * to the difference in register layout. It is utterly * essential that the XFER_SIZE register is written on * a per-descriptor basis with the same size as is the * descriptor! */ dp->cmd.pio_words[0] = ctrl0; +#ifdef CONFIG_MX28 dp->cmd.pio_words[1] = 0; dp->cmd.pio_words[2] = 0; dp->cmd.pio_words[3] = tl; +#endif mxs_dma_desc_append(dmach, dp); @@ -332,12 +336,7 @@ int spi_xfer(struct spi_slave *slave, unsigned int bitlen, char dummy; int write = 0; char *data = NULL; - -#ifdef CONFIG_MXS_SPI_DMA_ENABLE int dma = 1; -#else - int dma = 0; -#endif if (bitlen == 0) { if (flags & SPI_XFER_END) { |