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i2c-pxa2xx: Add PCI support for PXA I2C controller
The Sodaville I2C controller is almost the same as found on PXA2xx. The difference: - the register are at a different offset - no slave support The PCI probe code adds three platform devices which are probed then by the platform code. The X86 part also adds dummy clock defines because we don't have HW clock support. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Dirk Brandewie <dirk.brandewie@gmail.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
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Sebastian Andrzej Siewior
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Ben Dooks
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Mar 21, 2011
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,176 @@ | ||
| /* | ||
| * The CE4100's I2C device is more or less the same one as found on PXA. | ||
| * It does not support slave mode, the register slightly moved. This PCI | ||
| * device provides three bars, every contains a single I2C controller. | ||
| */ | ||
| #include <linux/pci.h> | ||
| #include <linux/platform_device.h> | ||
| #include <linux/i2c/pxa-i2c.h> | ||
| #include <linux/of.h> | ||
| #include <linux/of_device.h> | ||
| #include <linux/of_address.h> | ||
|
|
||
| #define CE4100_PCI_I2C_DEVS 3 | ||
|
|
||
| struct ce4100_devices { | ||
| struct platform_device *pdev[CE4100_PCI_I2C_DEVS]; | ||
| }; | ||
|
|
||
| static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar) | ||
| { | ||
| struct platform_device *pdev; | ||
| struct i2c_pxa_platform_data pdata; | ||
| struct resource res[2]; | ||
| struct device_node *child; | ||
| static int devnum; | ||
| int ret; | ||
|
|
||
| memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data)); | ||
| memset(&res, 0, sizeof(res)); | ||
|
|
||
| res[0].flags = IORESOURCE_MEM; | ||
| res[0].start = pci_resource_start(dev, bar); | ||
| res[0].end = pci_resource_end(dev, bar); | ||
|
|
||
| res[1].flags = IORESOURCE_IRQ; | ||
| res[1].start = dev->irq; | ||
| res[1].end = dev->irq; | ||
|
|
||
| for_each_child_of_node(dev->dev.of_node, child) { | ||
| const void *prop; | ||
| struct resource r; | ||
| int ret; | ||
|
|
||
| ret = of_address_to_resource(child, 0, &r); | ||
| if (ret < 0) | ||
| continue; | ||
| if (r.start != res[0].start) | ||
| continue; | ||
| if (r.end != res[0].end) | ||
| continue; | ||
| if (r.flags != res[0].flags) | ||
| continue; | ||
|
|
||
| prop = of_get_property(child, "fast-mode", NULL); | ||
| if (prop) | ||
| pdata.fast_mode = 1; | ||
|
|
||
| break; | ||
| } | ||
|
|
||
| if (!child) { | ||
| dev_err(&dev->dev, "failed to match a DT node for bar %d.\n", | ||
| bar); | ||
| ret = -EINVAL; | ||
| goto out; | ||
| } | ||
|
|
||
| pdev = platform_device_alloc("ce4100-i2c", devnum); | ||
| if (!pdev) { | ||
| of_node_put(child); | ||
| ret = -ENOMEM; | ||
| goto out; | ||
| } | ||
| pdev->dev.parent = &dev->dev; | ||
| pdev->dev.of_node = child; | ||
|
|
||
| ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res)); | ||
| if (ret) | ||
| goto err; | ||
|
|
||
| ret = platform_device_add_data(pdev, &pdata, sizeof(pdata)); | ||
| if (ret) | ||
| goto err; | ||
|
|
||
| ret = platform_device_add(pdev); | ||
| if (ret) | ||
| goto err; | ||
| devnum++; | ||
| return pdev; | ||
| err: | ||
| platform_device_put(pdev); | ||
| out: | ||
| return ERR_PTR(ret); | ||
| } | ||
|
|
||
| static int __devinit ce4100_i2c_probe(struct pci_dev *dev, | ||
| const struct pci_device_id *ent) | ||
| { | ||
| int ret; | ||
| int i; | ||
| struct ce4100_devices *sds; | ||
|
|
||
| ret = pci_enable_device_mem(dev); | ||
| if (ret) | ||
| return ret; | ||
|
|
||
| if (!dev->dev.of_node) { | ||
| dev_err(&dev->dev, "Missing device tree node.\n"); | ||
| return -EINVAL; | ||
| } | ||
| sds = kzalloc(sizeof(*sds), GFP_KERNEL); | ||
| if (!sds) | ||
| goto err_mem; | ||
|
|
||
| for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) { | ||
| sds->pdev[i] = add_i2c_device(dev, i); | ||
| if (IS_ERR(sds->pdev[i])) { | ||
| while (--i >= 0) | ||
| platform_device_unregister(sds->pdev[i]); | ||
| goto err_dev_add; | ||
| } | ||
| } | ||
| pci_set_drvdata(dev, sds); | ||
| return 0; | ||
|
|
||
| err_dev_add: | ||
| pci_set_drvdata(dev, NULL); | ||
| kfree(sds); | ||
| err_mem: | ||
| pci_disable_device(dev); | ||
| return ret; | ||
| } | ||
|
|
||
| static void __devexit ce4100_i2c_remove(struct pci_dev *dev) | ||
| { | ||
| struct ce4100_devices *sds; | ||
| unsigned int i; | ||
|
|
||
| sds = pci_get_drvdata(dev); | ||
| pci_set_drvdata(dev, NULL); | ||
|
|
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| for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) | ||
| platform_device_unregister(sds->pdev[i]); | ||
|
|
||
| pci_disable_device(dev); | ||
| kfree(sds); | ||
| } | ||
|
|
||
| static struct pci_device_id ce4100_i2c_devices[] __devinitdata = { | ||
| { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)}, | ||
| { }, | ||
| }; | ||
| MODULE_DEVICE_TABLE(pci, ce4100_i2c_devices); | ||
|
|
||
| static struct pci_driver ce4100_i2c_driver = { | ||
| .name = "ce4100_i2c", | ||
| .id_table = ce4100_i2c_devices, | ||
| .probe = ce4100_i2c_probe, | ||
| .remove = __devexit_p(ce4100_i2c_remove), | ||
| }; | ||
|
|
||
| static int __init ce4100_i2c_init(void) | ||
| { | ||
| return pci_register_driver(&ce4100_i2c_driver); | ||
| } | ||
| module_init(ce4100_i2c_init); | ||
|
|
||
| static void __exit ce4100_i2c_exit(void) | ||
| { | ||
| pci_unregister_driver(&ce4100_i2c_driver); | ||
| } | ||
| module_exit(ce4100_i2c_exit); | ||
|
|
||
| MODULE_DESCRIPTION("CE4100 PCI-I2C glue code for PXA's driver"); | ||
| MODULE_LICENSE("GPL v2"); | ||
| MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>"); |
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