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/slab.h>
20
21 #include <asm/setup.h>
22 #include <asm/amigahw.h>
23
24 #include "zorro.h"
25
26
27 /*
28 * Zorro Expansion Devices
29 */
30
31 unsigned int zorro_num_autocon;
32 struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
33
34
35 /*
36 * Zorro bus
37 */
38
39 struct zorro_bus {
40 struct list_head devices; /* list of devices on this bus */
41 struct device dev;
42 };
43
44
45 /*
46 * Find Zorro Devices
47 */
48
zorro_find_device(zorro_id id,struct zorro_dev * from)49 struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
50 {
51 struct zorro_dev *z;
52
53 if (!zorro_num_autocon)
54 return NULL;
55
56 for (z = from ? from+1 : &zorro_autocon[0];
57 z < zorro_autocon+zorro_num_autocon;
58 z++)
59 if (id == ZORRO_WILDCARD || id == z->id)
60 return z;
61 return NULL;
62 }
63 EXPORT_SYMBOL(zorro_find_device);
64
65
66 /*
67 * Bitmask indicating portions of available Zorro II RAM that are unused
68 * by the system. Every bit represents a 64K chunk, for a maximum of 8MB
69 * (128 chunks, physical 0x00200000-0x009fffff).
70 *
71 * If you want to use (= allocate) portions of this RAM, you should clear
72 * the corresponding bits.
73 *
74 * Possible uses:
75 * - z2ram device
76 * - SCSI DMA bounce buffers
77 *
78 * FIXME: use the normal resource management
79 */
80
81 DECLARE_BITMAP(zorro_unused_z2ram, 128);
82 EXPORT_SYMBOL(zorro_unused_z2ram);
83
84
mark_region(unsigned long start,unsigned long end,int flag)85 static void __init mark_region(unsigned long start, unsigned long end,
86 int flag)
87 {
88 if (flag)
89 start += Z2RAM_CHUNKMASK;
90 else
91 end += Z2RAM_CHUNKMASK;
92 start &= ~Z2RAM_CHUNKMASK;
93 end &= ~Z2RAM_CHUNKMASK;
94
95 if (end <= Z2RAM_START || start >= Z2RAM_END)
96 return;
97 start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
98 end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
99 while (start < end) {
100 u32 chunk = start>>Z2RAM_CHUNKSHIFT;
101 if (flag)
102 set_bit(chunk, zorro_unused_z2ram);
103 else
104 clear_bit(chunk, zorro_unused_z2ram);
105 start += Z2RAM_CHUNKSIZE;
106 }
107 }
108
109
zorro_find_parent_resource(struct platform_device * bridge,struct zorro_dev * z)110 static struct resource __init *zorro_find_parent_resource(
111 struct platform_device *bridge, struct zorro_dev *z)
112 {
113 int i;
114
115 for (i = 0; i < bridge->num_resources; i++) {
116 struct resource *r = &bridge->resource[i];
117 if (zorro_resource_start(z) >= r->start &&
118 zorro_resource_end(z) <= r->end)
119 return r;
120 }
121 return &iomem_resource;
122 }
123
124
125
amiga_zorro_probe(struct platform_device * pdev)126 static int __init amiga_zorro_probe(struct platform_device *pdev)
127 {
128 struct zorro_bus *bus;
129 struct zorro_dev *z;
130 struct resource *r;
131 unsigned int i;
132 int error;
133
134 /* Initialize the Zorro bus */
135 bus = kzalloc(sizeof(*bus), GFP_KERNEL);
136 if (!bus)
137 return -ENOMEM;
138
139 INIT_LIST_HEAD(&bus->devices);
140 bus->dev.parent = &pdev->dev;
141 dev_set_name(&bus->dev, "zorro");
142 error = device_register(&bus->dev);
143 if (error) {
144 pr_err("Zorro: Error registering zorro_bus\n");
145 put_device(&bus->dev);
146 kfree(bus);
147 return error;
148 }
149 platform_set_drvdata(pdev, bus);
150
151 /* Register all devices */
152 pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",
153 zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
154
155 for (i = 0; i < zorro_num_autocon; i++) {
156 z = &zorro_autocon[i];
157 z->id = (z->rom.er_Manufacturer<<16) | (z->rom.er_Product<<8);
158 if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
159 /* GVP quirk */
160 unsigned long magic = zorro_resource_start(z)+0x8000;
161 z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
162 }
163 sprintf(z->name, "Zorro device %08x", z->id);
164 zorro_name_device(z);
165 z->resource.name = z->name;
166 r = zorro_find_parent_resource(pdev, z);
167 error = request_resource(r, &z->resource);
168 if (error)
169 dev_err(&bus->dev,
170 "Address space collision on device %s %pR\n",
171 z->name, &z->resource);
172 dev_set_name(&z->dev, "%02x", i);
173 z->dev.parent = &bus->dev;
174 z->dev.bus = &zorro_bus_type;
175 error = device_register(&z->dev);
176 if (error) {
177 dev_err(&bus->dev, "Error registering device %s\n",
178 z->name);
179 put_device(&z->dev);
180 continue;
181 }
182 error = zorro_create_sysfs_dev_files(z);
183 if (error)
184 dev_err(&z->dev, "Error creating sysfs files\n");
185 }
186
187 /* Mark all available Zorro II memory */
188 zorro_for_each_dev(z) {
189 if (z->rom.er_Type & ERTF_MEMLIST)
190 mark_region(zorro_resource_start(z),
191 zorro_resource_end(z)+1, 1);
192 }
193
194 /* Unmark all used Zorro II memory */
195 for (i = 0; i < m68k_num_memory; i++)
196 if (m68k_memory[i].addr < 16*1024*1024)
197 mark_region(m68k_memory[i].addr,
198 m68k_memory[i].addr+m68k_memory[i].size,
199 0);
200
201 return 0;
202 }
203
204 static struct platform_driver amiga_zorro_driver = {
205 .driver = {
206 .name = "amiga-zorro",
207 .owner = THIS_MODULE,
208 },
209 };
210
amiga_zorro_init(void)211 static int __init amiga_zorro_init(void)
212 {
213 return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
214 }
215
216 module_init(amiga_zorro_init);
217
218 MODULE_LICENSE("GPL");
219