151 lines
3.3 KiB
C
151 lines
3.3 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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#include <linux/pm_runtime.h>
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static int ce4100_pci_suspend(struct device *dev)
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{
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dev_dbg(dev, "suspend called\n");
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return 0;
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}
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static int ce4100_pci_runtime_suspend(struct device *dev)
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{
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dev_dbg(dev, "runtime suspend called\n");
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return 0;
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}
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static int ce4100_pci_resume(struct device *dev)
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{
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dev_dbg(dev, "resume called\n");
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return 0;
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}
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static int ce4100_pci_runtime_resume(struct device *dev)
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{
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dev_dbg(dev, "runtime resume called\n");
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return 0;
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}
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static const struct dev_pm_ops ce4100_pm_ops = {
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.suspend_late = ce4100_pci_suspend,
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.resume_early = ce4100_pci_resume,
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SET_RUNTIME_PM_OPS(ce4100_pci_runtime_suspend,
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ce4100_pci_runtime_resume,
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NULL)
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};
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#define VNDR_CAPABILITY_ADID_OFFSET 6
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static inline u8 ssp_cfg_get_spi_bus_nb(u8 ssp_cfg)
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{
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return ((ssp_cfg) >> 2) & 0x07;
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}
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static int ce4100_spi_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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void __iomem **tbl;
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u8 ssp_cfg;
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int pos;
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pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);
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if (pos > 0) {
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pci_read_config_byte(dev,
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pos + VNDR_CAPABILITY_ADID_OFFSET,
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&ssp_cfg);
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} else {
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dev_info(&dev->dev, "No Vendor Specific PCI capability\n");
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return -ENODEV;
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}
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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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memset(&spi_pdata, 0, sizeof(spi_pdata));
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spi_pdata.num_chipselect = 4;
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ssp = &spi_pdata.ssp;
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ssp->phys_base = pci_resource_start(dev, 0);
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tbl = (void __iomem **) pcim_iomap_table(dev);
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if (!tbl) {
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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->mmio_base = tbl[0];
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ssp->irq = dev->irq;
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ssp->type = ent->driver_data;
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ssp->port_id = ssp_cfg_get_spi_bus_nb(ssp_cfg);
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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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pm_runtime_set_autosuspend_delay(&dev->dev, 50);
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pm_runtime_use_autosuspend(&dev->dev);
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pm_runtime_put_noidle(&dev->dev);
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pm_runtime_allow(&dev->dev);
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return 0;
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}
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static void ce4100_spi_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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pm_runtime_forbid(&dev->dev);
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pm_runtime_get_noresume(&dev->dev);
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platform_device_unregister(pdev);
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}
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static DEFINE_PCI_DEVICE_TABLE(ce4100_spi_devices) = {
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{ PCI_VDEVICE(INTEL, 0x2e6a), PXA25x_SSP },
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{ PCI_VDEVICE(INTEL, 0x1194), INTEL_SSP },
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};
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MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
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static struct pci_driver ce4100_spi_driver = {
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.name = "ce4100_spi",
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.id_table = ce4100_spi_devices,
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.probe = ce4100_spi_probe,
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.remove = ce4100_spi_remove,
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.driver = {
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.pm = &ce4100_pm_ops,
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},
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};
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module_pci_driver(ce4100_spi_driver);
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MODULE_DESCRIPTION("CE4100 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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