1/*
2 *    Zorro Bus Services
3 *
4 *    Copyright (C) 1995-2003 Geert Uytterhoeven
5 *
6 *    This file is subject to the terms and conditions of the GNU General Public
7 *    License.  See the file COPYING in the main directory of this archive
8 *    for more details.
9 */
10
11#include <linux/module.h>
12#include <linux/types.h>
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/zorro.h>
16#include <linux/bitops.h>
17#include <linux/string.h>
18#include <linux/platform_device.h>
19#include <linux/dma-mapping.h>
20#include <linux/slab.h>
21
22#include <asm/byteorder.h>
23#include <asm/setup.h>
24#include <asm/amigahw.h>
25
26#include "zorro.h"
27
28
29    /*
30     *  Zorro Expansion Devices
31     */
32
33unsigned int zorro_num_autocon;
34struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
35struct zorro_dev *zorro_autocon;
36
37
38    /*
39     *  Zorro bus
40     */
41
42struct zorro_bus {
43	struct device dev;
44	struct zorro_dev devices[];
45};
46
47
48    /*
49     *  Find Zorro Devices
50     */
51
52struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
53{
54	struct zorro_dev *z;
55
56	if (!zorro_num_autocon)
57		return NULL;
58
59	for (z = from ? from+1 : &zorro_autocon[0];
60	     z < zorro_autocon+zorro_num_autocon;
61	     z++)
62		if (id == ZORRO_WILDCARD || id == z->id)
63			return z;
64	return NULL;
65}
66EXPORT_SYMBOL(zorro_find_device);
67
68
69    /*
70     *  Bitmask indicating portions of available Zorro II RAM that are unused
71     *  by the system. Every bit represents a 64K chunk, for a maximum of 8MB
72     *  (128 chunks, physical 0x00200000-0x009fffff).
73     *
74     *  If you want to use (= allocate) portions of this RAM, you should clear
75     *  the corresponding bits.
76     *
77     *  Possible uses:
78     *      - z2ram device
79     *      - SCSI DMA bounce buffers
80     *
81     *  FIXME: use the normal resource management
82     */
83
84DECLARE_BITMAP(zorro_unused_z2ram, 128);
85EXPORT_SYMBOL(zorro_unused_z2ram);
86
87
88static void __init mark_region(unsigned long start, unsigned long end,
89			       int flag)
90{
91	if (flag)
92		start += Z2RAM_CHUNKMASK;
93	else
94		end += Z2RAM_CHUNKMASK;
95	start &= ~Z2RAM_CHUNKMASK;
96	end &= ~Z2RAM_CHUNKMASK;
97
98	if (end <= Z2RAM_START || start >= Z2RAM_END)
99		return;
100	start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
101	end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
102	while (start < end) {
103		u32 chunk = start>>Z2RAM_CHUNKSHIFT;
104
105		if (flag)
106			set_bit(chunk, zorro_unused_z2ram);
107		else
108			clear_bit(chunk, zorro_unused_z2ram);
109		start += Z2RAM_CHUNKSIZE;
110	}
111}
112
113
114static struct resource __init *zorro_find_parent_resource(
115	struct platform_device *bridge, struct zorro_dev *z)
116{
117	int i;
118
119	for (i = 0; i < bridge->num_resources; i++) {
120		struct resource *r = &bridge->resource[i];
121
122		if (zorro_resource_start(z) >= r->start &&
123		    zorro_resource_end(z) <= r->end)
124			return r;
125	}
126	return &iomem_resource;
127}
128
129
130
131static int __init amiga_zorro_probe(struct platform_device *pdev)
132{
133	struct zorro_bus *bus;
134	struct zorro_dev_init *zi;
135	struct zorro_dev *z;
136	struct resource *r;
137	unsigned int i;
138	int error;
139
140	/* Initialize the Zorro bus */
141	bus = kzalloc(struct_size(bus, devices, zorro_num_autocon),
142		      GFP_KERNEL);
143	if (!bus)
144		return -ENOMEM;
145
146	zorro_autocon = bus->devices;
147	bus->dev.parent = &pdev->dev;
148	dev_set_name(&bus->dev, zorro_bus_type.name);
149	error = device_register(&bus->dev);
150	if (error) {
151		pr_err("Zorro: Error registering zorro_bus\n");
152		put_device(&bus->dev);
153		kfree(bus);
154		return error;
155	}
156	platform_set_drvdata(pdev, bus);
157
158	pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",
159		 zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
160
161	/* First identify all devices ... */
162	for (i = 0; i < zorro_num_autocon; i++) {
163		zi = &zorro_autocon_init[i];
164		z = &zorro_autocon[i];
165
166		z->rom = zi->rom;
167		z->id = (be16_to_cpu(z->rom.er_Manufacturer) << 16) |
168			(z->rom.er_Product << 8);
169		if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
170			/* GVP quirk */
171			unsigned long magic = zi->boardaddr + 0x8000;
172
173			z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
174		}
175		z->slotaddr = zi->slotaddr;
176		z->slotsize = zi->slotsize;
177		sprintf(z->name, "Zorro device %08x", z->id);
178		zorro_name_device(z);
179		z->resource.start = zi->boardaddr;
180		z->resource.end = zi->boardaddr + zi->boardsize - 1;
181		z->resource.name = z->name;
182		r = zorro_find_parent_resource(pdev, z);
183		error = request_resource(r, &z->resource);
184		if (error && !(z->rom.er_Type & ERTF_MEMLIST))
185			dev_err(&bus->dev,
186				"Address space collision on device %s %pR\n",
187				z->name, &z->resource);
188		z->dev.parent = &bus->dev;
189		z->dev.bus = &zorro_bus_type;
190		z->dev.id = i;
191		switch (z->rom.er_Type & ERT_TYPEMASK) {
192		case ERT_ZORROIII:
193			z->dev.coherent_dma_mask = DMA_BIT_MASK(32);
194			break;
195
196		case ERT_ZORROII:
197		default:
198			z->dev.coherent_dma_mask = DMA_BIT_MASK(24);
199			break;
200		}
201		z->dev.dma_mask = &z->dev.coherent_dma_mask;
202	}
203
204	/* ... then register them */
205	for (i = 0; i < zorro_num_autocon; i++) {
206		z = &zorro_autocon[i];
207		error = device_register(&z->dev);
208		if (error) {
209			dev_err(&bus->dev, "Error registering device %s\n",
210				z->name);
211			put_device(&z->dev);
212			continue;
213		}
214	}
215
216	/* Mark all available Zorro II memory */
217	zorro_for_each_dev(z) {
218		if (z->rom.er_Type & ERTF_MEMLIST)
219			mark_region(zorro_resource_start(z),
220				    zorro_resource_end(z)+1, 1);
221	}
222
223	/* Unmark all used Zorro II memory */
224	for (i = 0; i < m68k_num_memory; i++)
225		if (m68k_memory[i].addr < 16*1024*1024)
226			mark_region(m68k_memory[i].addr,
227				    m68k_memory[i].addr+m68k_memory[i].size,
228				    0);
229
230	return 0;
231}
232
233static struct platform_driver amiga_zorro_driver = {
234	.driver   = {
235		.name	= "amiga-zorro",
236	},
237};
238
239static int __init amiga_zorro_init(void)
240{
241	return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
242}
243
244module_init(amiga_zorro_init);
245
246MODULE_LICENSE("GPL");
247