Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / drivers / spi / pxa2xx_spi_pci.c

diff --git a/drivers/spi/pxa2xx_spi_pci.c b/drivers/spi/pxa2xx_spi_pci.c
new file mode 100644 (file)
index 0000000..19752b0
--- /dev/null
+++ b/drivers/spi/pxa2xx_spi_pci.c
@@ -0,0 +1,182 @@
+/*
+ * 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/spi/pxa2xx_spi.h>
+
+struct ce4100_info {
+       struct ssp_device ssp;
+       struct platform_device *spi_pdev;
+};
+
+static DEFINE_MUTEX(ssp_lock);
+static LIST_HEAD(ssp_list);
+
+struct ssp_device *pxa_ssp_request(int port, const char *label)
+{
+       struct ssp_device *ssp = NULL;
+
+       mutex_lock(&ssp_lock);
+
+       list_for_each_entry(ssp, &ssp_list, node) {
+               if (ssp->port_id == port && ssp->use_count == 0) {
+                       ssp->use_count++;
+                       ssp->label = label;
+                       break;
+               }
+       }
+
+       mutex_unlock(&ssp_lock);
+
+       if (&ssp->node == &ssp_list)
+               return NULL;
+
+       return ssp;
+}
+EXPORT_SYMBOL_GPL(pxa_ssp_request);
+
+void pxa_ssp_free(struct ssp_device *ssp)
+{
+       mutex_lock(&ssp_lock);
+       if (ssp->use_count) {
+               ssp->use_count--;
+               ssp->label = NULL;
+       } else
+               dev_err(&ssp->pdev->dev, "device already free\n");
+       mutex_unlock(&ssp_lock);
+}
+EXPORT_SYMBOL_GPL(pxa_ssp_free);
+
+static int __devinit ce4100_spi_probe(struct pci_dev *dev,
+               const struct pci_device_id *ent)
+{
+       int ret;
+       resource_size_t phys_beg;
+       resource_size_t phys_len;
+       struct ce4100_info *spi_info;
+       struct platform_device *pdev;
+       struct pxa2xx_spi_master spi_pdata;
+       struct ssp_device *ssp;
+
+       ret = pci_enable_device(dev);
+       if (ret)
+               return ret;
+
+       phys_beg = pci_resource_start(dev, 0);
+       phys_len = pci_resource_len(dev, 0);
+
+       if (!request_mem_region(phys_beg, phys_len,
+                               "CE4100 SPI")) {
+               dev_err(&dev->dev, "Can't request register space.\n");
+               ret = -EBUSY;
+               return ret;
+       }
+
+       pdev = platform_device_alloc("pxa2xx-spi", dev->devfn);
+       spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
+       if (!pdev || !spi_info ) {
+               ret = -ENOMEM;
+               goto err_nomem;
+       }
+       memset(&spi_pdata, 0, sizeof(spi_pdata));
+       spi_pdata.num_chipselect = dev->devfn;
+
+       ret = platform_device_add_data(pdev, &spi_pdata, sizeof(spi_pdata));
+       if (ret)
+               goto err_nomem;
+
+       pdev->dev.parent = &dev->dev;
+#ifdef CONFIG_OF
+       pdev->dev.of_node = dev->dev.of_node;
+#endif
+       ssp = &spi_info->ssp;
+       ssp->phys_base = pci_resource_start(dev, 0);
+       ssp->mmio_base = ioremap(phys_beg, phys_len);
+       if (!ssp->mmio_base) {
+               dev_err(&pdev->dev, "failed to ioremap() registers\n");
+               ret = -EIO;
+               goto err_nomem;
+       }
+       ssp->irq = dev->irq;
+       ssp->port_id = pdev->id;
+       ssp->type = PXA25x_SSP;
+
+       mutex_lock(&ssp_lock);
+       list_add(&ssp->node, &ssp_list);
+       mutex_unlock(&ssp_lock);
+
+       pci_set_drvdata(dev, spi_info);
+
+       ret = platform_device_add(pdev);
+       if (ret)
+               goto err_dev_add;
+
+       return ret;
+
+err_dev_add:
+       pci_set_drvdata(dev, NULL);
+       mutex_lock(&ssp_lock);
+       list_del(&ssp->node);
+       mutex_unlock(&ssp_lock);
+       iounmap(ssp->mmio_base);
+
+err_nomem:
+       release_mem_region(phys_beg, phys_len);
+       platform_device_put(pdev);
+       kfree(spi_info);
+       return ret;
+}
+
+static void __devexit ce4100_spi_remove(struct pci_dev *dev)
+{
+       struct ce4100_info *spi_info;
+       struct ssp_device *ssp;
+
+       spi_info = pci_get_drvdata(dev);
+       ssp = &spi_info->ssp;
+       platform_device_unregister(spi_info->spi_pdev);
+
+       iounmap(ssp->mmio_base);
+       release_mem_region(pci_resource_start(dev, 0),
+                       pci_resource_len(dev, 0));
+
+       mutex_lock(&ssp_lock);
+       list_del(&ssp->node);
+       mutex_unlock(&ssp_lock);
+
+       pci_set_drvdata(dev, NULL);
+       pci_disable_device(dev);
+       kfree(spi_info);
+}
+
+static struct pci_device_id ce4100_spi_devices[] __devinitdata = {
+       { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
+       { },
+};
+MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
+
+static struct pci_driver ce4100_spi_driver = {
+       .name           = "ce4100_spi",
+       .id_table       = ce4100_spi_devices,
+       .probe          = ce4100_spi_probe,
+       .remove         = __devexit_p(ce4100_spi_remove),
+};
+
+static int __init ce4100_spi_init(void)
+{
+       return pci_register_driver(&ce4100_spi_driver);
+}
+module_init(ce4100_spi_init);
+
+static void __exit ce4100_spi_exit(void)
+{
+       pci_unregister_driver(&ce4100_spi_driver);
+}
+module_exit(ce4100_spi_exit);
+
+MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");