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_bus_match(struct device *dev, struct device_driver *driver)
 18{
 19	return 1;
 20}
 21
 22static 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
 32static 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
 40struct bus_type nubus_bus_type = {
 41	.name		= "nubus",
 42	.match		= nubus_bus_match,
 43	.probe		= nubus_device_probe,
 44	.remove		= nubus_device_remove,
 45};
 46EXPORT_SYMBOL(nubus_bus_type);
 47
 48int nubus_driver_register(struct nubus_driver *ndrv)
 49{
 50	ndrv->driver.bus = &nubus_bus_type;
 51	return driver_register(&ndrv->driver);
 52}
 53EXPORT_SYMBOL(nubus_driver_register);
 54
 55void nubus_driver_unregister(struct nubus_driver *ndrv)
 56{
 57	driver_unregister(&ndrv->driver);
 58}
 59EXPORT_SYMBOL(nubus_driver_unregister);
 60
 61static struct device nubus_parent = {
 62	.init_name	= "nubus",
 63};
 64
 65static int __init nubus_bus_register(void)
 66{
 67	return bus_register(&nubus_bus_type);
 68}
 69postcore_initcall(nubus_bus_register);
 70
 71int __init nubus_parent_device_register(void)
 72{
 73	return device_register(&nubus_parent);
 74}
 75
 76static 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
 89int 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
100static 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
109int 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}