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mxs: spi: Fix the MXS SPI for mx23

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The MX23 has slightly different register layout. Adjust the SPI
driver to match the layout, both the PIO and DMA part.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Otavio Salvador <otavio@ossystems.com.br>
Cc: Stefano Babic <sbabic@denx.de>
This commit is contained in:
Marek Vasut 2013-02-23 02:42:59 +00:00 • committed by Stefano Babic
parent 3430e0bd2a
commit c96e78ccfe
1 changed files with 17 additions and 2 deletions
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19
drivers/spi/mxs_spi.c
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@ -168,7 +168,12 @@ 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 +231,12 @@ 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 +292,7 @@ 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 +309,19 @@ 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);