drivers/nubus/bus.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Bus implementation for the NuBus subsystem.
   4 //
   5 // Copyright (C) 2017 Finn Thain
   6
   7 #include <linux/device.h>
   8 #include <linux/dma-mapping.h>
   9 #include <linux/list.h>
  10 #include <linux/nubus.h>
  11 #include <linux/seq_file.h>
  12 #include <linux/slab.h>
  13
  14 #define to_nubus_board(d)       container_of(d, struct nubus_board, dev)
  15 #define to_nubus_driver(d)      container_of(d, struct nubus_driver, driver)
  16
  17 static int nubus_bus_match(struct device *dev, struct device_driver *driver)
  18 {
  19         return 1;
  20 }
  21
  22 static int nubus_device_probe(struct device *dev)
  23 {
  24         struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
  25         int err = -ENODEV;
  26
  27         if (ndrv->probe)
  28                 err = ndrv->probe(to_nubus_board(dev));
  29         return err;
  30 }
  31
  32 static int nubus_device_remove(struct device *dev)
  33 {
  34         struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
  35         int err = -ENODEV;
  36
  37         if (dev->driver && ndrv->remove)
  38                 err = ndrv->remove(to_nubus_board(dev));
  39         return err;
  40 }
  41
  42 struct bus_type nubus_bus_type = {
  43         .name           = "nubus",
  44         .match          = nubus_bus_match,
  45         .probe          = nubus_device_probe,
  46         .remove         = nubus_device_remove,
  47 };
  48 EXPORT_SYMBOL(nubus_bus_type);
  49
  50 int nubus_driver_register(struct nubus_driver *ndrv)
  51 {
  52         ndrv->driver.bus = &nubus_bus_type;
  53         return driver_register(&ndrv->driver);
  54 }
  55 EXPORT_SYMBOL(nubus_driver_register);
  56
  57 void nubus_driver_unregister(struct nubus_driver *ndrv)
  58 {
  59         driver_unregister(&ndrv->driver);
  60 }
  61 EXPORT_SYMBOL(nubus_driver_unregister);
  62
  63 static struct device nubus_parent = {
  64         .init_name      = "nubus",
  65 };
  66
  67 static int __init nubus_bus_register(void)
  68 {
  69         return bus_register(&nubus_bus_type);
  70 }
  71 postcore_initcall(nubus_bus_register);
  72
  73 int __init nubus_parent_device_register(void)
  74 {
  75         return device_register(&nubus_parent);
  76 }
  77
  78 static void nubus_device_release(struct device *dev)
  79 {
  80         struct nubus_board *board = to_nubus_board(dev);
  81         struct nubus_rsrc *fres, *tmp;
  82
  83         list_for_each_entry_safe(fres, tmp, &nubus_func_rsrcs, list)
  84                 if (fres->board == board) {
  85                         list_del(&fres->list);
  86                         kfree(fres);
  87                 }
  88         kfree(board);
  89 }
  90
  91 int nubus_device_register(struct nubus_board *board)
  92 {
  93         board->dev.parent = &nubus_parent;
  94         board->dev.release = nubus_device_release;
  95         board->dev.bus = &nubus_bus_type;
  96         dev_set_name(&board->dev, "slot.%X", board->slot);
  97         board->dev.dma_mask = &board->dev.coherent_dma_mask;
  98         dma_set_mask(&board->dev, DMA_BIT_MASK(32));
  99         return device_register(&board->dev);
 100 }
 101
 102 static int nubus_print_device_name_fn(struct device *dev, void *data)
 103 {
 104         struct nubus_board *board = to_nubus_board(dev);
 105         struct seq_file *m = data;
 106
 107         seq_printf(m, "Slot %X: %s\n", board->slot, board->name);
 108         return 0;
 109 }
 110
 111 int nubus_proc_show(struct seq_file *m, void *data)
 112 {
 113         return bus_for_each_dev(&nubus_bus_type, NULL, m,
 114                                 nubus_print_device_name_fn);
 115 }