1 // SPDX-License-Identifier: GPL-2.0-only
3 * Intel MIC Platform Software Stack (MPSS)
5 * Copyright(c) 2014 Intel Corporation.
7 * Intel MIC Bus driver.
9 * This implementation is very similar to the the virtio bus driver
10 * implementation @ drivers/virtio/virtio.c
12 #include <linux/dma-map-ops.h>
13 #include <linux/slab.h>
14 #include <linux/module.h>
15 #include <linux/idr.h>
16 #include <linux/mic_bus.h>
18 static ssize_t device_show(struct device *d,
19 struct device_attribute *attr, char *buf)
21 struct mbus_device *dev = dev_to_mbus(d);
22 return sprintf(buf, "0x%04x\n", dev->id.device);
24 static DEVICE_ATTR_RO(device);
26 static ssize_t vendor_show(struct device *d,
27 struct device_attribute *attr, char *buf)
29 struct mbus_device *dev = dev_to_mbus(d);
30 return sprintf(buf, "0x%04x\n", dev->id.vendor);
32 static DEVICE_ATTR_RO(vendor);
34 static ssize_t modalias_show(struct device *d,
35 struct device_attribute *attr, char *buf)
37 struct mbus_device *dev = dev_to_mbus(d);
38 return sprintf(buf, "mbus:d%08Xv%08X\n",
39 dev->id.device, dev->id.vendor);
41 static DEVICE_ATTR_RO(modalias);
43 static struct attribute *mbus_dev_attrs[] = {
44 &dev_attr_device.attr,
45 &dev_attr_vendor.attr,
46 &dev_attr_modalias.attr,
49 ATTRIBUTE_GROUPS(mbus_dev);
51 static inline int mbus_id_match(const struct mbus_device *dev,
52 const struct mbus_device_id *id)
54 if (id->device != dev->id.device && id->device != MBUS_DEV_ANY_ID)
57 return id->vendor == MBUS_DEV_ANY_ID || id->vendor == dev->id.vendor;
61 * This looks through all the IDs a driver claims to support. If any of them
62 * match, we return 1 and the kernel will call mbus_dev_probe().
64 static int mbus_dev_match(struct device *dv, struct device_driver *dr)
67 struct mbus_device *dev = dev_to_mbus(dv);
68 const struct mbus_device_id *ids;
70 ids = drv_to_mbus(dr)->id_table;
71 for (i = 0; ids[i].device; i++)
72 if (mbus_id_match(dev, &ids[i]))
77 static int mbus_uevent(struct device *dv, struct kobj_uevent_env *env)
79 struct mbus_device *dev = dev_to_mbus(dv);
81 return add_uevent_var(env, "MODALIAS=mbus:d%08Xv%08X",
82 dev->id.device, dev->id.vendor);
85 static int mbus_dev_probe(struct device *d)
88 struct mbus_device *dev = dev_to_mbus(d);
89 struct mbus_driver *drv = drv_to_mbus(dev->dev.driver);
91 err = drv->probe(dev);
98 static int mbus_dev_remove(struct device *d)
100 struct mbus_device *dev = dev_to_mbus(d);
101 struct mbus_driver *drv = drv_to_mbus(dev->dev.driver);
107 static struct bus_type mic_bus = {
109 .match = mbus_dev_match,
110 .dev_groups = mbus_dev_groups,
111 .uevent = mbus_uevent,
112 .probe = mbus_dev_probe,
113 .remove = mbus_dev_remove,
116 int mbus_register_driver(struct mbus_driver *driver)
118 driver->driver.bus = &mic_bus;
119 return driver_register(&driver->driver);
121 EXPORT_SYMBOL_GPL(mbus_register_driver);
123 void mbus_unregister_driver(struct mbus_driver *driver)
125 driver_unregister(&driver->driver);
127 EXPORT_SYMBOL_GPL(mbus_unregister_driver);
129 static void mbus_release_dev(struct device *d)
131 struct mbus_device *mbdev = dev_to_mbus(d);
136 mbus_register_device(struct device *pdev, int id, const struct dma_map_ops *dma_ops,
137 struct mbus_hw_ops *hw_ops, int index,
138 void __iomem *mmio_va)
141 struct mbus_device *mbdev;
143 mbdev = kzalloc(sizeof(*mbdev), GFP_KERNEL);
145 return ERR_PTR(-ENOMEM);
147 mbdev->mmio_va = mmio_va;
148 mbdev->dev.parent = pdev;
149 mbdev->id.device = id;
150 mbdev->id.vendor = MBUS_DEV_ANY_ID;
151 mbdev->dev.dma_ops = dma_ops;
152 mbdev->dev.dma_mask = &mbdev->dev.coherent_dma_mask;
153 dma_set_mask(&mbdev->dev, DMA_BIT_MASK(64));
154 mbdev->dev.release = mbus_release_dev;
155 mbdev->hw_ops = hw_ops;
156 mbdev->dev.bus = &mic_bus;
157 mbdev->index = index;
158 dev_set_name(&mbdev->dev, "mbus-dev%u", mbdev->index);
160 * device_register() causes the bus infrastructure to look for a
163 ret = device_register(&mbdev->dev);
168 put_device(&mbdev->dev);
171 EXPORT_SYMBOL_GPL(mbus_register_device);
173 void mbus_unregister_device(struct mbus_device *mbdev)
175 device_unregister(&mbdev->dev);
177 EXPORT_SYMBOL_GPL(mbus_unregister_device);
179 static int __init mbus_init(void)
181 return bus_register(&mic_bus);
184 static void __exit mbus_exit(void)
186 bus_unregister(&mic_bus);
189 core_initcall(mbus_init);
190 module_exit(mbus_exit);
192 MODULE_AUTHOR("Intel Corporation");
193 MODULE_DESCRIPTION("Intel(R) MIC Bus driver");
194 MODULE_LICENSE("GPL v2");