Initial import

1 files changed, 221 insertions, 0 deletions

diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
new file mode 100644
index 000000000..fa7399e84
--- /dev/null
+++ b/drivers/spi/spi-pxa2xx-pci.c
@@ -0,0 +1,221 @@
+/*
+ * CE4100's SPI device is more or less the same one as found on PXA
+ *
+ */
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/module.h>
+#include <linux/spi/pxa2xx_spi.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+
+#include <linux/dmaengine.h>
+#include <linux/platform_data/dma-dw.h>
+
+enum {
+	PORT_CE4100,
+	PORT_BYT,
+	PORT_BSW0,
+	PORT_BSW1,
+	PORT_BSW2,
+	PORT_QUARK_X1000,
+};
+
+struct pxa_spi_info {
+	enum pxa_ssp_type type;
+	int port_id;
+	int num_chipselect;
+	unsigned long max_clk_rate;
+
+	/* DMA channel request parameters */
+	void *tx_param;
+	void *rx_param;
+};
+
+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 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 };
+static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
+static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
+static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
+
+static bool lpss_dma_filter(struct dma_chan *chan, void *param)
+{
+	struct dw_dma_slave *dws = param;
+
+	if (dws->dma_dev != chan->device->dev)
+		return false;
+
+	chan->private = dws;
+	return true;
+}
+
+static struct pxa_spi_info spi_info_configs[] = {
+	[PORT_CE4100] = {
+		.type = PXA25x_SSP,
+		.port_id =  -1,
+		.num_chipselect = -1,
+		.max_clk_rate = 3686400,
+	},
+	[PORT_BYT] = {
+		.type = LPSS_SSP,
+		.port_id = 0,
+		.num_chipselect = 1,
+		.max_clk_rate = 50000000,
+		.tx_param = &byt_tx_param,
+		.rx_param = &byt_rx_param,
+	},
+	[PORT_BSW0] = {
+		.type = LPSS_SSP,
+		.port_id = 0,
+		.num_chipselect = 1,
+		.max_clk_rate = 50000000,
+		.tx_param = &bsw0_tx_param,
+		.rx_param = &bsw0_rx_param,
+	},
+	[PORT_BSW1] = {
+		.type = LPSS_SSP,
+		.port_id = 1,
+		.num_chipselect = 1,
+		.max_clk_rate = 50000000,
+		.tx_param = &bsw1_tx_param,
+		.rx_param = &bsw1_rx_param,
+	},
+	[PORT_BSW2] = {
+		.type = LPSS_SSP,
+		.port_id = 2,
+		.num_chipselect = 1,
+		.max_clk_rate = 50000000,
+		.tx_param = &bsw2_tx_param,
+		.rx_param = &bsw2_rx_param,
+	},
+	[PORT_QUARK_X1000] = {
+		.type = QUARK_X1000_SSP,
+		.port_id = -1,
+		.num_chipselect = 1,
+		.max_clk_rate = 50000000,
+	},
+};
+
+static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
+		const struct pci_device_id *ent)
+{
+	struct platform_device_info pi;
+	int ret;
+	struct platform_device *pdev;
+	struct pxa2xx_spi_master spi_pdata;
+	struct ssp_device *ssp;
+	struct pxa_spi_info *c;
+	char buf[40];
+	struct pci_dev *dma_dev;
+
+	ret = pcim_enable_device(dev);
+	if (ret)
+		return ret;
+
+	ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
+	if (ret)
+		return ret;
+
+	c = &spi_info_configs[ent->driver_data];
+
+	memset(&spi_pdata, 0, sizeof(spi_pdata));
+	spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
+					c->num_chipselect : dev->devfn;
+
+	dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
+
+	if (c->tx_param) {
+		struct dw_dma_slave *slave = c->tx_param;
+
+		slave->dma_dev = &dma_dev->dev;
+		slave->src_master = 1;
+		slave->dst_master = 0;
+	}
+
+	if (c->rx_param) {
+		struct dw_dma_slave *slave = c->rx_param;
+
+		slave->dma_dev = &dma_dev->dev;
+		slave->src_master = 1;
+		slave->dst_master = 0;
+	}
+
+	spi_pdata.dma_filter = lpss_dma_filter;
+	spi_pdata.tx_param = c->tx_param;
+	spi_pdata.rx_param = c->rx_param;
+	spi_pdata.enable_dma = c->rx_param && c->tx_param;
+
+	ssp = &spi_pdata.ssp;
+	ssp->phys_base = pci_resource_start(dev, 0);
+	ssp->mmio_base = pcim_iomap_table(dev)[0];
+	if (!ssp->mmio_base) {
+		dev_err(&dev->dev, "failed to ioremap() registers\n");
+		return -EIO;
+	}
+	ssp->irq = dev->irq;
+	ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
+	ssp->type = c->type;
+
+	snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
+	ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
+					CLK_IS_ROOT, c->max_clk_rate);
+	 if (IS_ERR(ssp->clk))
+		return PTR_ERR(ssp->clk);
+
+	memset(&pi, 0, sizeof(pi));
+	pi.parent = &dev->dev;
+	pi.name = "pxa2xx-spi";
+	pi.id = ssp->port_id;
+	pi.data = &spi_pdata;
+	pi.size_data = sizeof(spi_pdata);
+
+	pdev = platform_device_register_full(&pi);
+	if (IS_ERR(pdev)) {
+		clk_unregister(ssp->clk);
+		return PTR_ERR(pdev);
+	}
+
+	pci_set_drvdata(dev, pdev);
+
+	return 0;
+}
+
+static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
+{
+	struct platform_device *pdev = pci_get_drvdata(dev);
+	struct pxa2xx_spi_master *spi_pdata;
+
+	spi_pdata = dev_get_platdata(&pdev->dev);
+
+	platform_device_unregister(pdev);
+	clk_unregister(spi_pdata->ssp.clk);
+}
+
+static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
+	{ PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
+	{ PCI_VDEVICE(INTEL, 0x0935), PORT_QUARK_X1000 },
+	{ PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
+	{ PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
+	{ PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
+	{ PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
+	{ },
+};
+MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
+
+static struct pci_driver pxa2xx_spi_pci_driver = {
+	.name           = "pxa2xx_spi_pci",
+	.id_table       = pxa2xx_spi_pci_devices,
+	.probe          = pxa2xx_spi_pci_probe,
+	.remove         = pxa2xx_spi_pci_remove,
+};
+
+module_pci_driver(pxa2xx_spi_pci_driver);
+
+MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");