1 /* 2 * The CE4100's I2C device is more or less the same one as found on PXA. 3 * It does not support slave mode, the register slightly moved. This PCI 4 * device provides three bars, every contains a single I2C controller. 5 */ 6 #include <linux/module.h> 7 #include <linux/pci.h> 8 #include <linux/platform_device.h> 9 #include <linux/i2c/pxa-i2c.h> 10 #include <linux/of.h> 11 #include <linux/of_device.h> 12 #include <linux/of_address.h> 13 14 #define CE4100_PCI_I2C_DEVS 3 15 16 struct ce4100_devices { 17 struct platform_device *pdev[CE4100_PCI_I2C_DEVS]; 18 }; 19 20 static struct platform_device *add_i2c_device(struct pci_dev *dev, int bar) 21 { 22 struct platform_device *pdev; 23 struct i2c_pxa_platform_data pdata; 24 struct resource res[2]; 25 struct device_node *child; 26 static int devnum; 27 int ret; 28 29 memset(&pdata, 0, sizeof(struct i2c_pxa_platform_data)); 30 memset(&res, 0, sizeof(res)); 31 32 res[0].flags = IORESOURCE_MEM; 33 res[0].start = pci_resource_start(dev, bar); 34 res[0].end = pci_resource_end(dev, bar); 35 36 res[1].flags = IORESOURCE_IRQ; 37 res[1].start = dev->irq; 38 res[1].end = dev->irq; 39 40 for_each_child_of_node(dev->dev.of_node, child) { 41 const void *prop; 42 struct resource r; 43 int ret; 44 45 ret = of_address_to_resource(child, 0, &r); 46 if (ret < 0) 47 continue; 48 if (r.start != res[0].start) 49 continue; 50 if (r.end != res[0].end) 51 continue; 52 if (r.flags != res[0].flags) 53 continue; 54 55 prop = of_get_property(child, "fast-mode", NULL); 56 if (prop) 57 pdata.fast_mode = 1; 58 59 break; 60 } 61 62 if (!child) { 63 dev_err(&dev->dev, "failed to match a DT node for bar %d.\n", 64 bar); 65 ret = -EINVAL; 66 goto out; 67 } 68 69 pdev = platform_device_alloc("ce4100-i2c", devnum); 70 if (!pdev) { 71 of_node_put(child); 72 ret = -ENOMEM; 73 goto out; 74 } 75 pdev->dev.parent = &dev->dev; 76 pdev->dev.of_node = child; 77 78 ret = platform_device_add_resources(pdev, res, ARRAY_SIZE(res)); 79 if (ret) 80 goto err; 81 82 ret = platform_device_add_data(pdev, &pdata, sizeof(pdata)); 83 if (ret) 84 goto err; 85 86 ret = platform_device_add(pdev); 87 if (ret) 88 goto err; 89 devnum++; 90 return pdev; 91 err: 92 platform_device_put(pdev); 93 out: 94 return ERR_PTR(ret); 95 } 96 97 static int ce4100_i2c_probe(struct pci_dev *dev, 98 const struct pci_device_id *ent) 99 { 100 int ret; 101 int i; 102 struct ce4100_devices *sds; 103 104 ret = pci_enable_device_mem(dev); 105 if (ret) 106 return ret; 107 108 if (!dev->dev.of_node) { 109 dev_err(&dev->dev, "Missing device tree node.\n"); 110 return -EINVAL; 111 } 112 sds = kzalloc(sizeof(*sds), GFP_KERNEL); 113 if (!sds) { 114 ret = -ENOMEM; 115 goto err_mem; 116 } 117 118 for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) { 119 sds->pdev[i] = add_i2c_device(dev, i); 120 if (IS_ERR(sds->pdev[i])) { 121 ret = PTR_ERR(sds->pdev[i]); 122 while (--i >= 0) 123 platform_device_unregister(sds->pdev[i]); 124 goto err_dev_add; 125 } 126 } 127 pci_set_drvdata(dev, sds); 128 return 0; 129 130 err_dev_add: 131 kfree(sds); 132 err_mem: 133 pci_disable_device(dev); 134 return ret; 135 } 136 137 static void ce4100_i2c_remove(struct pci_dev *dev) 138 { 139 struct ce4100_devices *sds; 140 unsigned int i; 141 142 sds = pci_get_drvdata(dev); 143 144 for (i = 0; i < ARRAY_SIZE(sds->pdev); i++) 145 platform_device_unregister(sds->pdev[i]); 146 147 pci_disable_device(dev); 148 kfree(sds); 149 } 150 151 static const struct pci_device_id ce4100_i2c_devices[] = { 152 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e68)}, 153 { }, 154 }; 155 MODULE_DEVICE_TABLE(pci, ce4100_i2c_devices); 156 157 static struct pci_driver ce4100_i2c_driver = { 158 .name = "ce4100_i2c", 159 .id_table = ce4100_i2c_devices, 160 .probe = ce4100_i2c_probe, 161 .remove = ce4100_i2c_remove, 162 }; 163 164 module_pci_driver(ce4100_i2c_driver); 165 166 MODULE_DESCRIPTION("CE4100 PCI-I2C glue code for PXA's driver"); 167 MODULE_LICENSE("GPL v2"); 168 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>"); 169