drivers/misc/mic/bus/vop_bus.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel MIC Platform Software Stack (MPSS)
   4  *
   5  * Copyright(c) 2016 Intel Corporation.
   6  *
   7  * Intel Virtio Over PCIe (VOP) Bus driver.
   8  */
   9 #include <linux/slab.h>
  10 #include <linux/module.h>
  11 #include <linux/idr.h>
  12 #include <linux/dma-mapping.h>
  13
  14 #include "vop_bus.h"
  15
  16 static ssize_t device_show(struct device *d,
  17                            struct device_attribute *attr, char *buf)
  18 {
  19         struct vop_device *dev = dev_to_vop(d);
  20
  21         return sprintf(buf, "0x%04x\n", dev->id.device);
  22 }
  23 static DEVICE_ATTR_RO(device);
  24
  25 static ssize_t vendor_show(struct device *d,
  26                            struct device_attribute *attr, char *buf)
  27 {
  28         struct vop_device *dev = dev_to_vop(d);
  29
  30         return sprintf(buf, "0x%04x\n", dev->id.vendor);
  31 }
  32 static DEVICE_ATTR_RO(vendor);
  33
  34 static ssize_t modalias_show(struct device *d,
  35                              struct device_attribute *attr, char *buf)
  36 {
  37         struct vop_device *dev = dev_to_vop(d);
  38
  39         return sprintf(buf, "vop:d%08Xv%08X\n",
  40                        dev->id.device, dev->id.vendor);
  41 }
  42 static DEVICE_ATTR_RO(modalias);
  43
  44 static struct attribute *vop_dev_attrs[] = {
  45         &dev_attr_device.attr,
  46         &dev_attr_vendor.attr,
  47         &dev_attr_modalias.attr,
  48         NULL,
  49 };
  50 ATTRIBUTE_GROUPS(vop_dev);
  51
  52 static inline int vop_id_match(const struct vop_device *dev,
  53                                const struct vop_device_id *id)
  54 {
  55         if (id->device != dev->id.device && id->device != VOP_DEV_ANY_ID)
  56                 return 0;
  57
  58         return id->vendor == VOP_DEV_ANY_ID || id->vendor == dev->id.vendor;
  59 }
  60
  61 /*
  62  * This looks through all the IDs a driver claims to support.  If any of them
  63  * match, we return 1 and the kernel will call vop_dev_probe().
  64  */
  65 static int vop_dev_match(struct device *dv, struct device_driver *dr)
  66 {
  67         unsigned int i;
  68         struct vop_device *dev = dev_to_vop(dv);
  69         const struct vop_device_id *ids;
  70
  71         ids = drv_to_vop(dr)->id_table;
  72         for (i = 0; ids[i].device; i++)
  73                 if (vop_id_match(dev, &ids[i]))
  74                         return 1;
  75         return 0;
  76 }
  77
  78 static int vop_uevent(struct device *dv, struct kobj_uevent_env *env)
  79 {
  80         struct vop_device *dev = dev_to_vop(dv);
  81
  82         return add_uevent_var(env, "MODALIAS=vop:d%08Xv%08X",
  83                               dev->id.device, dev->id.vendor);
  84 }
  85
  86 static int vop_dev_probe(struct device *d)
  87 {
  88         struct vop_device *dev = dev_to_vop(d);
  89         struct vop_driver *drv = drv_to_vop(dev->dev.driver);
  90
  91         return drv->probe(dev);
  92 }
  93
  94 static int vop_dev_remove(struct device *d)
  95 {
  96         struct vop_device *dev = dev_to_vop(d);
  97         struct vop_driver *drv = drv_to_vop(dev->dev.driver);
  98
  99         drv->remove(dev);
 100         return 0;
 101 }
 102
 103 static struct bus_type vop_bus = {
 104         .name  = "vop_bus",
 105         .match = vop_dev_match,
 106         .dev_groups = vop_dev_groups,
 107         .uevent = vop_uevent,
 108         .probe = vop_dev_probe,
 109         .remove = vop_dev_remove,
 110 };
 111
 112 int vop_register_driver(struct vop_driver *driver)
 113 {
 114         driver->driver.bus = &vop_bus;
 115         return driver_register(&driver->driver);
 116 }
 117 EXPORT_SYMBOL_GPL(vop_register_driver);
 118
 119 void vop_unregister_driver(struct vop_driver *driver)
 120 {
 121         driver_unregister(&driver->driver);
 122 }
 123 EXPORT_SYMBOL_GPL(vop_unregister_driver);
 124
 125 static void vop_release_dev(struct device *d)
 126 {
 127         struct vop_device *dev = dev_to_vop(d);
 128
 129         kfree(dev);
 130 }
 131
 132 struct vop_device *
 133 vop_register_device(struct device *pdev, int id,
 134                     const struct dma_map_ops *dma_ops,
 135                     struct vop_hw_ops *hw_ops, u8 dnode, struct mic_mw *aper,
 136                     struct dma_chan *chan)
 137 {
 138         int ret;
 139         struct vop_device *vdev;
 140
 141         vdev = kzalloc(sizeof(*vdev), GFP_KERNEL);
 142         if (!vdev)
 143                 return ERR_PTR(-ENOMEM);
 144
 145         vdev->dev.parent = pdev;
 146         vdev->id.device = id;
 147         vdev->id.vendor = VOP_DEV_ANY_ID;
 148         vdev->dev.dma_ops = dma_ops;
 149         vdev->dev.dma_mask = &vdev->dev.coherent_dma_mask;
 150         dma_set_mask(&vdev->dev, DMA_BIT_MASK(64));
 151         vdev->dev.release = vop_release_dev;
 152         vdev->hw_ops = hw_ops;
 153         vdev->dev.bus = &vop_bus;
 154         vdev->dnode = dnode;
 155         vdev->aper = aper;
 156         vdev->dma_ch = chan;
 157         vdev->index = dnode - 1;
 158         dev_set_name(&vdev->dev, "vop-dev%u", vdev->index);
 159         /*
 160          * device_register() causes the bus infrastructure to look for a
 161          * matching driver.
 162          */
 163         ret = device_register(&vdev->dev);
 164         if (ret)
 165                 goto free_vdev;
 166         return vdev;
 167 free_vdev:
 168         put_device(&vdev->dev);
 169         return ERR_PTR(ret);
 170 }
 171 EXPORT_SYMBOL_GPL(vop_register_device);
 172
 173 void vop_unregister_device(struct vop_device *dev)
 174 {
 175         device_unregister(&dev->dev);
 176 }
 177 EXPORT_SYMBOL_GPL(vop_unregister_device);
 178
 179 static int __init vop_init(void)
 180 {
 181         return bus_register(&vop_bus);
 182 }
 183
 184 static void __exit vop_exit(void)
 185 {
 186         bus_unregister(&vop_bus);
 187 }
 188
 189 core_initcall(vop_init);
 190 module_exit(vop_exit);
 191
 192 MODULE_AUTHOR("Intel Corporation");
 193 MODULE_DESCRIPTION("Intel(R) VOP Bus driver");
 194 MODULE_LICENSE("GPL v2");