text: /*
   * 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-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_BYT_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_BYT_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_BYT_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_BYT_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>");
  