Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 1 | /* |
Paul Gortmaker | ff3a98b | 2016-10-31 13:59:47 -0400 | [diff] [blame] | 2 | * CE4100 PCI-I2C glue code for PXA's driver |
| 3 | * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| 4 | * License: GPL v2 |
| 5 | * |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 6 | * The CE4100's I2C device is more or less the same one as found on PXA. |
| 7 | * It does not support slave mode, the register slightly moved. This PCI |
| 8 | * device provides three bars, every contains a single I2C controller. |
| 9 | */ |
Paul Gortmaker | ff3a98b | 2016-10-31 13:59:47 -0400 | [diff] [blame] | 10 | #include <linux/init.h> |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 11 | #include <linux/pci.h> |
| 12 | #include <linux/platform_device.h> |
| 13 | #include <linux/i2c/pxa-i2c.h> |
| 14 | #include <linux/of.h> |
| 15 | #include <linux/of_device.h> |
| 16 | #include <linux/of_address.h> |
| 17 | |
| 18 | #define CE4100_PCI_I2C_DEVS 3 |
| 19 | |
| 20 | struct ce4100_devices { |
| 21 | struct platform_device *pdev[CE4100_PCI_I2C_DEVS]; |
| 22 | }; |
| 23 | |
| 24 | static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar) |
| 25 | { |
| 26 | struct platform_device *pdev; |
| 27 | struct i2c_pxa_platform_data pdata; |
| 28 | struct resource res[2]; |
| 29 | struct device_node *child; |
| 30 | static int devnum; |
| 31 | int ret; |
| 32 | |
| 33 | memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data)); |
| 34 | memset(&res, 0, sizeof(res)); |
| 35 | |
| 36 | res[0].flags = IORESOURCE_MEM; |
| 37 | res[0].start = pci_resource_start(dev, bar); |
| 38 | res[0].end = pci_resource_end(dev, bar); |
| 39 | |
| 40 | res[1].flags = IORESOURCE_IRQ; |
| 41 | res[1].start = dev->irq; |
| 42 | res[1].end = dev->irq; |
| 43 | |
| 44 | for_each_child_of_node(dev->dev.of_node, child) { |
| 45 | const void *prop; |
| 46 | struct resource r; |
| 47 | int ret; |
| 48 | |
| 49 | ret = of_address_to_resource(child, 0, &r); |
| 50 | if (ret < 0) |
| 51 | continue; |
| 52 | if (r.start != res[0].start) |
| 53 | continue; |
| 54 | if (r.end != res[0].end) |
| 55 | continue; |
| 56 | if (r.flags != res[0].flags) |
| 57 | continue; |
| 58 | |
| 59 | prop = of_get_property(child, "fast-mode", NULL); |
| 60 | if (prop) |
| 61 | pdata.fast_mode = 1; |
| 62 | |
| 63 | break; |
| 64 | } |
| 65 | |
| 66 | if (!child) { |
| 67 | dev_err(&dev->dev, "failed to match a DT node for bar %d.\n", |
| 68 | bar); |
| 69 | ret = -EINVAL; |
| 70 | goto out; |
| 71 | } |
| 72 | |
| 73 | pdev = platform_device_alloc("ce4100-i2c", devnum); |
| 74 | if (!pdev) { |
| 75 | of_node_put(child); |
| 76 | ret = -ENOMEM; |
| 77 | goto out; |
| 78 | } |
| 79 | pdev->dev.parent = &dev->dev; |
| 80 | pdev->dev.of_node = child; |
| 81 | |
| 82 | ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res)); |
| 83 | if (ret) |
| 84 | goto err; |
| 85 | |
| 86 | ret = platform_device_add_data(pdev, &pdata, sizeof(pdata)); |
| 87 | if (ret) |
| 88 | goto err; |
| 89 | |
| 90 | ret = platform_device_add(pdev); |
| 91 | if (ret) |
| 92 | goto err; |
| 93 | devnum++; |
| 94 | return pdev; |
| 95 | err: |
| 96 | platform_device_put(pdev); |
| 97 | out: |
| 98 | return ERR_PTR(ret); |
| 99 | } |
| 100 | |
Bill Pemberton | 0b255e9 | 2012-11-27 15:59:38 -0500 | [diff] [blame] | 101 | static int ce4100_i2c_probe(struct pci_dev *dev, |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 102 | const struct pci_device_id *ent) |
| 103 | { |
| 104 | int ret; |
| 105 | int i; |
| 106 | struct ce4100_devices *sds; |
| 107 | |
| 108 | ret = pci_enable_device_mem(dev); |
| 109 | if (ret) |
| 110 | return ret; |
| 111 | |
| 112 | if (!dev->dev.of_node) { |
| 113 | dev_err(&dev->dev, "Missing device tree node.\n"); |
| 114 | return -EINVAL; |
| 115 | } |
| 116 | sds = kzalloc(sizeof(*sds), GFP_KERNEL); |
Axel Lin | 7a703ad | 2011-08-30 14:37:37 +0800 | [diff] [blame] | 117 | if (!sds) { |
| 118 | ret = -ENOMEM; |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 119 | goto err_mem; |
Axel Lin | 7a703ad | 2011-08-30 14:37:37 +0800 | [diff] [blame] | 120 | } |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 121 | |
| 122 | for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) { |
| 123 | sds->pdev[i] = add_i2c_device(dev, i); |
| 124 | if (IS_ERR(sds->pdev[i])) { |
Axel Lin | 7a703ad | 2011-08-30 14:37:37 +0800 | [diff] [blame] | 125 | ret = PTR_ERR(sds->pdev[i]); |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 126 | while (--i >= 0) |
| 127 | platform_device_unregister(sds->pdev[i]); |
| 128 | goto err_dev_add; |
| 129 | } |
| 130 | } |
| 131 | pci_set_drvdata(dev, sds); |
| 132 | return 0; |
| 133 | |
| 134 | err_dev_add: |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 135 | kfree(sds); |
| 136 | err_mem: |
| 137 | pci_disable_device(dev); |
| 138 | return ret; |
| 139 | } |
| 140 | |
Jingoo Han | 392debf | 2013-12-03 08:11:20 +0900 | [diff] [blame] | 141 | static const struct pci_device_id ce4100_i2c_devices[] = { |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 142 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)}, |
| 143 | { }, |
| 144 | }; |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 145 | |
| 146 | static struct pci_driver ce4100_i2c_driver = { |
Paul Gortmaker | ff3a98b | 2016-10-31 13:59:47 -0400 | [diff] [blame] | 147 | .driver = { |
| 148 | .suppress_bind_attrs = true, |
| 149 | }, |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 150 | .name = "ce4100_i2c", |
| 151 | .id_table = ce4100_i2c_devices, |
| 152 | .probe = ce4100_i2c_probe, |
Sebastian Andrzej Siewior | 7e94dd1 | 2011-03-02 11:26:53 +0100 | [diff] [blame] | 153 | }; |
Paul Gortmaker | ff3a98b | 2016-10-31 13:59:47 -0400 | [diff] [blame] | 154 | builtin_pci_driver(ce4100_i2c_driver); |