drivers/misc/mic/bus/scif_bus.c

   1 /*
   2  * Intel MIC Platform Software Stack (MPSS)
   3  *
   4  * Copyright(c) 2014 Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License, version 2, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * Intel Symmetric Communications Interface Bus driver.
  16  */
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <linux/idr.h>
  20 #include <linux/dma-mapping.h>
  21
  22 #include "scif_bus.h"
  23
  24 static ssize_t device_show(struct device *d,
  25                            struct device_attribute *attr, char *buf)
  26 {
  27         struct scif_hw_dev *dev = dev_to_scif(d);
  28
  29         return sprintf(buf, "0x%04x\n", dev->id.device);
  30 }
  31 static DEVICE_ATTR_RO(device);
  32
  33 static ssize_t vendor_show(struct device *d,
  34                            struct device_attribute *attr, char *buf)
  35 {
  36         struct scif_hw_dev *dev = dev_to_scif(d);
  37
  38         return sprintf(buf, "0x%04x\n", dev->id.vendor);
  39 }
  40 static DEVICE_ATTR_RO(vendor);
  41
  42 static ssize_t modalias_show(struct device *d,
  43                              struct device_attribute *attr, char *buf)
  44 {
  45         struct scif_hw_dev *dev = dev_to_scif(d);
  46
  47         return sprintf(buf, "scif:d%08Xv%08X\n",
  48                        dev->id.device, dev->id.vendor);
  49 }
  50 static DEVICE_ATTR_RO(modalias);
  51
  52 static struct attribute *scif_dev_attrs[] = {
  53         &dev_attr_device.attr,
  54         &dev_attr_vendor.attr,
  55         &dev_attr_modalias.attr,
  56         NULL,
  57 };
  58 ATTRIBUTE_GROUPS(scif_dev);
  59
  60 static inline int scif_id_match(const struct scif_hw_dev *dev,
  61                                 const struct scif_hw_dev_id *id)
  62 {
  63         if (id->device != dev->id.device && id->device != SCIF_DEV_ANY_ID)
  64                 return 0;
  65
  66         return id->vendor == SCIF_DEV_ANY_ID || id->vendor == dev->id.vendor;
  67 }
  68
  69 /*
  70  * This looks through all the IDs a driver claims to support.  If any of them
  71  * match, we return 1 and the kernel will call scif_dev_probe().
  72  */
  73 static int scif_dev_match(struct device *dv, struct device_driver *dr)
  74 {
  75         unsigned int i;
  76         struct scif_hw_dev *dev = dev_to_scif(dv);
  77         const struct scif_hw_dev_id *ids;
  78
  79         ids = drv_to_scif(dr)->id_table;
  80         for (i = 0; ids[i].device; i++)
  81                 if (scif_id_match(dev, &ids[i]))
  82                         return 1;
  83         return 0;
  84 }
  85
  86 static int scif_uevent(struct device *dv, struct kobj_uevent_env *env)
  87 {
  88         struct scif_hw_dev *dev = dev_to_scif(dv);
  89
  90         return add_uevent_var(env, "MODALIAS=scif:d%08Xv%08X",
  91                               dev->id.device, dev->id.vendor);
  92 }
  93
  94 static int scif_dev_probe(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         return drv->probe(dev);
 100 }
 101
 102 static int scif_dev_remove(struct device *d)
 103 {
 104         struct scif_hw_dev *dev = dev_to_scif(d);
 105         struct scif_driver *drv = drv_to_scif(dev->dev.driver);
 106
 107         drv->remove(dev);
 108         return 0;
 109 }
 110
 111 static struct bus_type scif_bus = {
 112         .name  = "scif_bus",
 113         .match = scif_dev_match,
 114         .dev_groups = scif_dev_groups,
 115         .uevent = scif_uevent,
 116         .probe = scif_dev_probe,
 117         .remove = scif_dev_remove,
 118 };
 119
 120 int scif_register_driver(struct scif_driver *driver)
 121 {
 122         driver->driver.bus = &scif_bus;
 123         return driver_register(&driver->driver);
 124 }
 125 EXPORT_SYMBOL_GPL(scif_register_driver);
 126
 127 void scif_unregister_driver(struct scif_driver *driver)
 128 {
 129         driver_unregister(&driver->driver);
 130 }
 131 EXPORT_SYMBOL_GPL(scif_unregister_driver);
 132
 133 static void scif_release_dev(struct device *d)
 134 {
 135         struct scif_hw_dev *sdev = dev_to_scif(d);
 136
 137         kfree(sdev);
 138 }
 139
 140 struct scif_hw_dev *
 141 scif_register_device(struct device *pdev, int id, const struct dma_map_ops *dma_ops,
 142                      struct scif_hw_ops *hw_ops, u8 dnode, u8 snode,
 143                      struct mic_mw *mmio, struct mic_mw *aper, void *dp,
 144                      void __iomem *rdp, struct dma_chan **chan, int num_chan,
 145                      bool card_rel_da)
 146 {
 147         int ret;
 148         struct scif_hw_dev *sdev;
 149
 150         sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
 151         if (!sdev)
 152                 return ERR_PTR(-ENOMEM);
 153
 154         sdev->dev.parent = pdev;
 155         sdev->id.device = id;
 156         sdev->id.vendor = SCIF_DEV_ANY_ID;
 157         sdev->dev.dma_ops = dma_ops;
 158         sdev->dev.release = scif_release_dev;
 159         sdev->hw_ops = hw_ops;
 160         sdev->dnode = dnode;
 161         sdev->snode = snode;
 162         dev_set_drvdata(&sdev->dev, sdev);
 163         sdev->dev.bus = &scif_bus;
 164         sdev->mmio = mmio;
 165         sdev->aper = aper;
 166         sdev->dp = dp;
 167         sdev->rdp = rdp;
 168         sdev->dev.dma_mask = &sdev->dev.coherent_dma_mask;
 169         dma_set_mask(&sdev->dev, DMA_BIT_MASK(64));
 170         sdev->dma_ch = chan;
 171         sdev->num_dma_ch = num_chan;
 172         sdev->card_rel_da = card_rel_da;
 173         dev_set_name(&sdev->dev, "scif-dev%u", sdev->dnode);
 174         /*
 175          * device_register() causes the bus infrastructure to look for a
 176          * matching driver.
 177          */
 178         ret = device_register(&sdev->dev);
 179         if (ret)
 180                 goto free_sdev;
 181         return sdev;
 182 free_sdev:
 183         put_device(&sdev->dev);
 184         return ERR_PTR(ret);
 185 }
 186 EXPORT_SYMBOL_GPL(scif_register_device);
 187
 188 void scif_unregister_device(struct scif_hw_dev *sdev)
 189 {
 190         device_unregister(&sdev->dev);
 191 }
 192 EXPORT_SYMBOL_GPL(scif_unregister_device);
 193
 194 static int __init scif_init(void)
 195 {
 196         return bus_register(&scif_bus);
 197 }
 198
 199 static void __exit scif_exit(void)
 200 {
 201         bus_unregister(&scif_bus);
 202 }
 203
 204 core_initcall(scif_init);
 205 module_exit(scif_exit);
 206
 207 MODULE_AUTHOR("Intel Corporation");
 208 MODULE_DESCRIPTION("Intel(R) SCIF Bus driver");
 209 MODULE_LICENSE("GPL v2");