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 void nubus_device_remove(struct device *dev)
  33 {
  34         struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
  35
  36         if (ndrv->remove)
  37                 ndrv->remove(to_nubus_board(dev));
  38 }
  39
  40 struct bus_type nubus_bus_type = {
  41         .name           = "nubus",
  42         .match          = nubus_bus_match,
  43         .probe          = nubus_device_probe,
  44         .remove         = nubus_device_remove,
  45 };
  46 EXPORT_SYMBOL(nubus_bus_type);
  47
  48 int nubus_driver_register(struct nubus_driver *ndrv)
  49 {
  50         ndrv->driver.bus = &nubus_bus_type;
  51         return driver_register(&ndrv->driver);
  52 }
  53 EXPORT_SYMBOL(nubus_driver_register);
  54
  55 void nubus_driver_unregister(struct nubus_driver *ndrv)
  56 {
  57         driver_unregister(&ndrv->driver);
  58 }
  59 EXPORT_SYMBOL(nubus_driver_unregister);
  60
  61 static struct device nubus_parent = {
  62         .init_name      = "nubus",
  63 };
  64
  65 static int __init nubus_bus_register(void)
  66 {
  67         return bus_register(&nubus_bus_type);
  68 }
  69 postcore_initcall(nubus_bus_register);
  70
  71 int __init nubus_parent_device_register(void)
  72 {
  73         return device_register(&nubus_parent);
  74 }
  75
  76 static void nubus_device_release(struct device *dev)
  77 {
  78         struct nubus_board *board = to_nubus_board(dev);
  79         struct nubus_rsrc *fres, *tmp;
  80
  81         list_for_each_entry_safe(fres, tmp, &nubus_func_rsrcs, list)
  82                 if (fres->board == board) {
  83                         list_del(&fres->list);
  84                         kfree(fres);
  85                 }
  86         kfree(board);
  87 }
  88
  89 int nubus_device_register(struct nubus_board *board)
  90 {
  91         board->dev.parent = &nubus_parent;
  92         board->dev.release = nubus_device_release;
  93         board->dev.bus = &nubus_bus_type;
  94         dev_set_name(&board->dev, "slot.%X", board->slot);
  95         board->dev.dma_mask = &board->dev.coherent_dma_mask;
  96         dma_set_mask(&board->dev, DMA_BIT_MASK(32));
  97         return device_register(&board->dev);
  98 }
  99
 100 static int nubus_print_device_name_fn(struct device *dev, void *data)
 101 {
 102         struct nubus_board *board = to_nubus_board(dev);
 103         struct seq_file *m = data;
 104
 105         seq_printf(m, "Slot %X: %s\n", board->slot, board->name);
 106         return 0;
 107 }
 108
 109 int nubus_proc_show(struct seq_file *m, void *data)
 110 {
 111         return bus_for_each_dev(&nubus_bus_type, NULL, m,
 112                                 nubus_print_device_name_fn);
 113 }