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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-pxa2xx-pci.c

@@ -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;
 }