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Commit 25014521 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Mark Brown
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spi: pxa2xx-pci: Enable DMA for Intel Merrifield 



SPI controller on Intel Merrifield is backed by DMA engine. Add necessary bits
to support it.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 63971c56

drivers/spi/spi-pxa2xx-pci.c

+24 −0
Original line number Diff line number Diff line
@@ -41,6 +41,13 @@ struct pxa_spi_info { 
static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };

static struct dw_dma_slave byt_rx_param = { .src_id = 1 };



static struct dw_dma_slave mrfld3_tx_param = { .dst_id = 15 };

static struct dw_dma_slave mrfld3_rx_param = { .src_id = 14 };

static struct dw_dma_slave mrfld5_tx_param = { .dst_id = 13 };

static struct dw_dma_slave mrfld5_rx_param = { .src_id = 12 };

static struct dw_dma_slave mrfld6_tx_param = { .dst_id = 11 };

static struct dw_dma_slave mrfld6_rx_param = { .src_id = 10 };



static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };

static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };

static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
@@ -93,22 +100,39 @@ static int lpss_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c) 


static int mrfld_spi_setup(struct pci_dev *dev, struct pxa_spi_info *c)

{

	struct pci_dev *dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(21, 0));

	struct dw_dma_slave *tx, *rx;



	switch (PCI_FUNC(dev->devfn)) {

	case 0:

		c->port_id = 3;

		c->num_chipselect = 1;

		c->tx_param = &mrfld3_tx_param;

		c->rx_param = &mrfld3_rx_param;

		break;

	case 1:

		c->port_id = 5;

		c->num_chipselect = 4;

		c->tx_param = &mrfld5_tx_param;

		c->rx_param = &mrfld5_rx_param;

		break;

	case 2:

		c->port_id = 6;

		c->num_chipselect = 1;

		c->tx_param = &mrfld6_tx_param;

		c->rx_param = &mrfld6_rx_param;

		break;

	default:

		return -ENODEV;

	}



	tx = c->tx_param;

	tx->dma_dev = &dma_dev->dev;



	rx = c->rx_param;

	rx->dma_dev = &dma_dev->dev;



	c->dma_filter = lpss_dma_filter;

	return 0;

}