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d6ba32d5c6
Similar to CE4100, BayTrail LPSS SPI can be PCI enumerated as well. Thus, the functions are renamed from ce4100_xxx to pxa2xx_spi_pci_xxx to clarify that this is a generic PCI glue layer. Also, added required infrastructure to support SPI hosts with different configurations. This patch is based on Mika Westerberg's previous work. Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com> Signed-off-by: Mark Brown <broonie@linaro.org>
129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
/*
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* CE4100's SPI device is more or less the same one as found on PXA
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*
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*/
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/of_device.h>
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#include <linux/module.h>
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#include <linux/spi/pxa2xx_spi.h>
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enum {
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PORT_CE4100,
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PORT_BYT,
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};
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struct pxa_spi_info {
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enum pxa_ssp_type type;
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int port_id;
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int num_chipselect;
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int tx_slave_id;
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int tx_chan_id;
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int rx_slave_id;
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int rx_chan_id;
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};
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static struct pxa_spi_info spi_info_configs[] = {
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[PORT_CE4100] = {
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.type = PXA25x_SSP,
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.port_id = -1,
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.num_chipselect = -1,
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.tx_slave_id = -1,
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.tx_chan_id = -1,
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.rx_slave_id = -1,
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.rx_chan_id = -1,
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},
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[PORT_BYT] = {
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.type = LPSS_SSP,
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.port_id = 0,
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.num_chipselect = 1,
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.tx_slave_id = 0,
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.tx_chan_id = 0,
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.rx_slave_id = 1,
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.rx_chan_id = 1,
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},
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};
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static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
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const struct pci_device_id *ent)
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{
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struct platform_device_info pi;
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int ret;
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struct platform_device *pdev;
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struct pxa2xx_spi_master spi_pdata;
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struct ssp_device *ssp;
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struct pxa_spi_info *c;
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ret = pcim_enable_device(dev);
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if (ret)
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return ret;
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ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
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if (ret)
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return ret;
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c = &spi_info_configs[ent->driver_data];
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memset(&spi_pdata, 0, sizeof(spi_pdata));
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spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
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c->num_chipselect : dev->devfn;
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spi_pdata.tx_slave_id = c->tx_slave_id;
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spi_pdata.tx_chan_id = c->tx_chan_id;
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spi_pdata.rx_slave_id = c->rx_slave_id;
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spi_pdata.rx_chan_id = c->rx_chan_id;
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spi_pdata.enable_dma = c->rx_slave_id >= 0 && c->tx_slave_id >= 0;
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ssp = &spi_pdata.ssp;
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ssp->phys_base = pci_resource_start(dev, 0);
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ssp->mmio_base = pcim_iomap_table(dev)[0];
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if (!ssp->mmio_base) {
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dev_err(&dev->dev, "failed to ioremap() registers\n");
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return -EIO;
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}
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ssp->irq = dev->irq;
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ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
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ssp->type = c->type;
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memset(&pi, 0, sizeof(pi));
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pi.parent = &dev->dev;
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pi.name = "pxa2xx-spi";
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pi.id = ssp->port_id;
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pi.data = &spi_pdata;
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pi.size_data = sizeof(spi_pdata);
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pdev = platform_device_register_full(&pi);
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if (IS_ERR(pdev))
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return PTR_ERR(pdev);
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pci_set_drvdata(dev, pdev);
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return 0;
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}
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static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
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{
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struct platform_device *pdev = pci_get_drvdata(dev);
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platform_device_unregister(pdev);
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}
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static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
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{ PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
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{ PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
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{ },
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};
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MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
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static struct pci_driver pxa2xx_spi_pci_driver = {
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.name = "pxa2xx_spi_pci",
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.id_table = pxa2xx_spi_pci_devices,
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.probe = pxa2xx_spi_pci_probe,
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.remove = pxa2xx_spi_pci_remove,
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};
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module_pci_driver(pxa2xx_spi_pci_driver);
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MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");
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