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_device_probe(struct device *dev)
  18 {
  19         struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
  20         int err = -ENODEV;
  21
  22         if (ndrv->probe)
  23                 err = ndrv->probe(to_nubus_board(dev));
  24         return err;
  25 }
  26
  27 static void nubus_device_remove(struct device *dev)
  28 {
  29         struct nubus_driver *ndrv = to_nubus_driver(dev->driver);
  30
  31         if (ndrv->remove)
  32                 ndrv->remove(to_nubus_board(dev));
  33 }
  34
  35 static const struct bus_type nubus_bus_type = {
  36         .name           = "nubus",
  37         .probe          = nubus_device_probe,
  38         .remove         = nubus_device_remove,
  39 };
  40
  41 int nubus_driver_register(struct nubus_driver *ndrv)
  42 {
  43         ndrv->driver.bus = &nubus_bus_type;
  44         return driver_register(&ndrv->driver);
  45 }
  46 EXPORT_SYMBOL(nubus_driver_register);
  47
  48 void nubus_driver_unregister(struct nubus_driver *ndrv)
  49 {
  50         driver_unregister(&ndrv->driver);
  51 }
  52 EXPORT_SYMBOL(nubus_driver_unregister);
  53
  54 static struct device nubus_parent = {
  55         .init_name      = "nubus",
  56 };
  57
  58 static int __init nubus_bus_register(void)
  59 {
  60         return bus_register(&nubus_bus_type);
  61 }
  62 postcore_initcall(nubus_bus_register);
  63
  64 int __init nubus_parent_device_register(void)
  65 {
  66         return device_register(&nubus_parent);
  67 }
  68
  69 static void nubus_device_release(struct device *dev)
  70 {
  71         struct nubus_board *board = to_nubus_board(dev);
  72         struct nubus_rsrc *fres, *tmp;
  73
  74         list_for_each_entry_safe(fres, tmp, &nubus_func_rsrcs, list)
  75                 if (fres->board == board) {
  76                         list_del(&fres->list);
  77                         kfree(fres);
  78                 }
  79         kfree(board);
  80 }
  81
  82 int nubus_device_register(struct nubus_board *board)
  83 {
  84         board->dev.parent = &nubus_parent;
  85         board->dev.release = nubus_device_release;
  86         board->dev.bus = &nubus_bus_type;
  87         dev_set_name(&board->dev, "slot.%X", board->slot);
  88         board->dev.dma_mask = &board->dev.coherent_dma_mask;
  89         dma_set_mask(&board->dev, DMA_BIT_MASK(32));
  90         return device_register(&board->dev);
  91 }
  92
  93 static int nubus_print_device_name_fn(struct device *dev, void *data)
  94 {
  95         struct nubus_board *board = to_nubus_board(dev);
  96         struct seq_file *m = data;
  97
  98         seq_printf(m, "Slot %X: %s\n", board->slot, board->name);
  99         return 0;
 100 }
 101
 102 int nubus_proc_show(struct seq_file *m, void *data)
 103 {
 104         return bus_for_each_dev(&nubus_bus_type, NULL, m,
 105                                 nubus_print_device_name_fn);
 106 }