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
17static 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
27static 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
35static const struct bus_type nubus_bus_type = {
36	.name		= "nubus",
37	.probe		= nubus_device_probe,
38	.remove		= nubus_device_remove,
39};
40
41int nubus_driver_register(struct nubus_driver *ndrv)
42{
43	ndrv->driver.bus = &nubus_bus_type;
44	return driver_register(&ndrv->driver);
45}
46EXPORT_SYMBOL(nubus_driver_register);
47
48void nubus_driver_unregister(struct nubus_driver *ndrv)
49{
50	driver_unregister(&ndrv->driver);
51}
52EXPORT_SYMBOL(nubus_driver_unregister);
53
54static struct device nubus_parent = {
55	.init_name	= "nubus",
56};
57
58static int __init nubus_bus_register(void)
59{
60	return bus_register(&nubus_bus_type);
61}
62postcore_initcall(nubus_bus_register);
63
64int __init nubus_parent_device_register(void)
65{
66	return device_register(&nubus_parent);
67}
68
69static 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
82int 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
93static 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
102int 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}
107