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@@ -0,0 +1,176 @@
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+/*
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+ * The CE4100's I2C device is more or less the same one as found on PXA.
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+ * It does not support slave mode, the register slightly moved. This PCI
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+ * device provides three bars, every contains a single I2C controller.
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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/i2c/pxa-i2c.h>
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+#include <linux/of.h>
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+#include <linux/of_device.h>
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+#include <linux/of_address.h>
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+
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+#define CE4100_PCI_I2C_DEVS 3
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+
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+struct ce4100_devices {
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+ struct platform_device *pdev[CE4100_PCI_I2C_DEVS];
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+};
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+
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+static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar)
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+{
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+ struct platform_device *pdev;
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+ struct i2c_pxa_platform_data pdata;
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+ struct resource res[2];
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+ struct device_node *child;
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+ static int devnum;
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+ int ret;
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+
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+ memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data));
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+ memset(&res, 0, sizeof(res));
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+
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+ res[0].flags = IORESOURCE_MEM;
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+ res[0].start = pci_resource_start(dev, bar);
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+ res[0].end = pci_resource_end(dev, bar);
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+
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+ res[1].flags = IORESOURCE_IRQ;
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+ res[1].start = dev->irq;
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+ res[1].end = dev->irq;
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+
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+ for_each_child_of_node(dev->dev.of_node, child) {
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+ const void *prop;
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+ struct resource r;
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+ int ret;
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+
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+ ret = of_address_to_resource(child, 0, &r);
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+ if (ret < 0)
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+ continue;
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+ if (r.start != res[0].start)
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+ continue;
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+ if (r.end != res[0].end)
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+ continue;
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+ if (r.flags != res[0].flags)
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+ continue;
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+
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+ prop = of_get_property(child, "fast-mode", NULL);
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+ if (prop)
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+ pdata.fast_mode = 1;
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+
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+ break;
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+ }
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+
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+ if (!child) {
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+ dev_err(&dev->dev, "failed to match a DT node for bar %d.\n",
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+ bar);
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+ ret = -EINVAL;
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+ goto out;
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+ }
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+
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+ pdev = platform_device_alloc("ce4100-i2c", devnum);
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+ if (!pdev) {
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+ of_node_put(child);
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+ ret = -ENOMEM;
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+ goto out;
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+ }
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+ pdev->dev.parent = &dev->dev;
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+ pdev->dev.of_node = child;
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+
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+ ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res));
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+ if (ret)
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+ goto err;
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+
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+ ret = platform_device_add_data(pdev, &pdata, sizeof(pdata));
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+ if (ret)
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+ goto err;
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+
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+ ret = platform_device_add(pdev);
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+ if (ret)
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+ goto err;
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+ devnum++;
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+ return pdev;
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+err:
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+ platform_device_put(pdev);
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+out:
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+ return ERR_PTR(ret);
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+}
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+
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+static int __devinit ce4100_i2c_probe(struct pci_dev *dev,
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+ const struct pci_device_id *ent)
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+{
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+ int ret;
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+ int i;
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+ struct ce4100_devices *sds;
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+
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+ ret = pci_enable_device_mem(dev);
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+ if (ret)
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+ return ret;
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+
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+ if (!dev->dev.of_node) {
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+ dev_err(&dev->dev, "Missing device tree node.\n");
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+ return -EINVAL;
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+ }
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+ sds = kzalloc(sizeof(*sds), GFP_KERNEL);
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+ if (!sds)
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+ goto err_mem;
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+
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+ for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) {
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+ sds->pdev[i] = add_i2c_device(dev, i);
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+ if (IS_ERR(sds->pdev[i])) {
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+ while (--i >= 0)
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+ platform_device_unregister(sds->pdev[i]);
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+ goto err_dev_add;
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+ }
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+ }
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+ pci_set_drvdata(dev, sds);
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+ return 0;
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+
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+err_dev_add:
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+ pci_set_drvdata(dev, NULL);
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+ kfree(sds);
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+err_mem:
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+ pci_disable_device(dev);
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+ return ret;
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+}
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+
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+static void __devexit ce4100_i2c_remove(struct pci_dev *dev)
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+{
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+ struct ce4100_devices *sds;
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+ unsigned int i;
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+
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+ sds = pci_get_drvdata(dev);
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+ pci_set_drvdata(dev, NULL);
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+
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+ for (i = 0; i < ARRAY_SIZE(sds->pdev); i++)
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+ platform_device_unregister(sds->pdev[i]);
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+
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+ pci_disable_device(dev);
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+ kfree(sds);
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+}
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+
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+static struct pci_device_id ce4100_i2c_devices[] __devinitdata = {
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+ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)},
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+ { },
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+};
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+MODULE_DEVICE_TABLE(pci, ce4100_i2c_devices);
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+
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+static struct pci_driver ce4100_i2c_driver = {
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+ .name = "ce4100_i2c",
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+ .id_table = ce4100_i2c_devices,
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+ .probe = ce4100_i2c_probe,
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+ .remove = __devexit_p(ce4100_i2c_remove),
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+};
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+
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+static int __init ce4100_i2c_init(void)
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+{
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+ return pci_register_driver(&ce4100_i2c_driver);
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+}
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+module_init(ce4100_i2c_init);
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+
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+static void __exit ce4100_i2c_exit(void)
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+{
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+ pci_unregister_driver(&ce4100_i2c_driver);
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+}
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+module_exit(ce4100_i2c_exit);
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+
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+MODULE_DESCRIPTION("CE4100 PCI-I2C 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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Sebastian Andrzej Siewior