drivers/misc/mic/bus/scif_bus.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Intel MIC Platform Software Stack (MPSS)
   4  *
   5  * Copyright(c) 2014 Intel Corporation.
   6  *
   7  * Intel Symmetric Communications Interface 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 "scif_bus.h"
  15
  16 static ssize_t device_show(struct device *d,
  17                            struct device_attribute *attr, char *buf)
  18 {
  19         struct scif_hw_dev *dev = dev_to_scif(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 scif_hw_dev *dev = dev_to_scif(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 scif_hw_dev *dev = dev_to_scif(d);
  38
  39         return sprintf(buf, "scif:d%08Xv%08X\n",
  40                        dev->id.device, dev->id.vendor);
  41 }
  42 static DEVICE_ATTR_RO(modalias);
  43
  44 static struct attribute *scif_dev_attrs[] = {
  45         &dev_attr_device.attr,
  46         &dev_attr_vendor.attr,
  47         &dev_attr_modalias.attr,
  48         NULL,
  49 };
  50 ATTRIBUTE_GROUPS(scif_dev);
  51
  52 static inline int scif_id_match(const struct scif_hw_dev *dev,
  53                                 const struct scif_hw_dev_id *id)
  54 {
  55         if (id->device != dev->id.device && id->device != SCIF_DEV_ANY_ID)
  56                 return 0;
  57
  58         return id->vendor == SCIF_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 scif_dev_probe().
  64  */
  65 static int scif_dev_match(struct device *dv, struct device_driver *dr)
  66 {
  67         unsigned int i;
  68         struct scif_hw_dev *dev = dev_to_scif(dv);
  69         const struct scif_hw_dev_id *ids;
  70
  71         ids = drv_to_scif(dr)->id_table;
  72         for (i = 0; ids[i].device; i++)
  73                 if (scif_id_match(dev, &ids[i]))
  74                         return 1;
  75         return 0;
  76 }
  77
  78 static int scif_uevent(struct device *dv, struct kobj_uevent_env *env)
  79 {
  80         struct scif_hw_dev *dev = dev_to_scif(dv);
  81
  82         return add_uevent_var(env, "MODALIAS=scif:d%08Xv%08X",
  83                               dev->id.device, dev->id.vendor);
  84 }
  85
  86 static int scif_dev_probe(struct device *d)
  87 {
  88         struct scif_hw_dev *dev = dev_to_scif(d);
  89         struct scif_driver *drv = drv_to_scif(dev->dev.driver);
  90
  91         return drv->probe(dev);
  92 }
  93
  94 static int scif_dev_remove(struct device *d)
  95 {
  96         struct scif_hw_dev *dev = dev_to_scif(d);
  97         struct scif_driver *drv = drv_to_scif(dev->dev.driver);
  98
  99         drv->remove(dev);
 100         return 0;
 101 }
 102
 103 static struct bus_type scif_bus = {
 104         .name  = "scif_bus",
 105         .match = scif_dev_match,
 106         .dev_groups = scif_dev_groups,
 107         .uevent = scif_uevent,
 108         .probe = scif_dev_probe,
 109         .remove = scif_dev_remove,
 110 };
 111
 112 int scif_register_driver(struct scif_driver *driver)
 113 {
 114         driver->driver.bus = &scif_bus;
 115         return driver_register(&driver->driver);
 116 }
 117 EXPORT_SYMBOL_GPL(scif_register_driver);
 118
 119 void scif_unregister_driver(struct scif_driver *driver)
 120 {
 121         driver_unregister(&driver->driver);
 122 }
 123 EXPORT_SYMBOL_GPL(scif_unregister_driver);
 124
 125 static void scif_release_dev(struct device *d)
 126 {
 127         struct scif_hw_dev *sdev = dev_to_scif(d);
 128
 129         kfree(sdev);
 130 }
 131
 132 struct scif_hw_dev *
 133 scif_register_device(struct device *pdev, int id, const struct dma_map_ops *dma_ops,
 134                      struct scif_hw_ops *hw_ops, u8 dnode, u8 snode,
 135                      struct mic_mw *mmio, struct mic_mw *aper, void *dp,
 136                      void __iomem *rdp, struct dma_chan **chan, int num_chan,
 137                      bool card_rel_da)
 138 {
 139         int ret;
 140         struct scif_hw_dev *sdev;
 141
 142         sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
 143         if (!sdev)
 144                 return ERR_PTR(-ENOMEM);
 145
 146         sdev->dev.parent = pdev;
 147         sdev->id.device = id;
 148         sdev->id.vendor = SCIF_DEV_ANY_ID;
 149         sdev->dev.dma_ops = dma_ops;
 150         sdev->dev.release = scif_release_dev;
 151         sdev->hw_ops = hw_ops;
 152         sdev->dnode = dnode;
 153         sdev->snode = snode;
 154         dev_set_drvdata(&sdev->dev, sdev);
 155         sdev->dev.bus = &scif_bus;
 156         sdev->mmio = mmio;
 157         sdev->aper = aper;
 158         sdev->dp = dp;
 159         sdev->rdp = rdp;
 160         sdev->dev.dma_mask = &sdev->dev.coherent_dma_mask;
 161         dma_set_mask(&sdev->dev, DMA_BIT_MASK(64));
 162         sdev->dma_ch = chan;
 163         sdev->num_dma_ch = num_chan;
 164         sdev->card_rel_da = card_rel_da;
 165         dev_set_name(&sdev->dev, "scif-dev%u", sdev->dnode);
 166         /*
 167          * device_register() causes the bus infrastructure to look for a
 168          * matching driver.
 169          */
 170         ret = device_register(&sdev->dev);
 171         if (ret)
 172                 goto free_sdev;
 173         return sdev;
 174 free_sdev:
 175         put_device(&sdev->dev);
 176         return ERR_PTR(ret);
 177 }
 178 EXPORT_SYMBOL_GPL(scif_register_device);
 179
 180 void scif_unregister_device(struct scif_hw_dev *sdev)
 181 {
 182         device_unregister(&sdev->dev);
 183 }
 184 EXPORT_SYMBOL_GPL(scif_unregister_device);
 185
 186 static int __init scif_init(void)
 187 {
 188         return bus_register(&scif_bus);
 189 }
 190
 191 static void __exit scif_exit(void)
 192 {
 193         bus_unregister(&scif_bus);
 194 }
 195
 196 core_initcall(scif_init);
 197 module_exit(scif_exit);
 198
 199 MODULE_AUTHOR("Intel Corporation");
 200 MODULE_DESCRIPTION("Intel(R) SCIF Bus driver");
 201 MODULE_LICENSE("GPL v2");