1 /*
2 * $Id: zorro.c,v 1.1.2.1 1998/06/07 23:21:02 geert Exp $
3 *
4 * Zorro Bus Services
5 *
6 * Copyright (C) 1995-2000 Geert Uytterhoeven
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License. See the file COPYING in the main directory of this archive
10 * for more details.
11 */
12
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/kernel.h>
16 #include <linux/init.h>
17 #include <linux/zorro.h>
18 #include <asm/setup.h>
19 #include <asm/bitops.h>
20 #include <asm/amigahw.h>
21
22
23 /*
24 * Zorro Expansion Devices
25 */
26
27 u_int zorro_num_autocon = 0;
28 struct zorro_dev zorro_autocon[ZORRO_NUM_AUTO];
29
30
31 /*
32 * Zorro Bus Resources
33 * Order _does_ matter! (see code below)
34 */
35
36 static struct resource zorro_res[4] = {
37 /* Zorro II regions (on Zorro II/III) */
38 { "Zorro II exp", 0x00e80000, 0x00efffff },
39 { "Zorro II mem", 0x00200000, 0x009fffff },
40 /* Zorro III regions (on Zorro III only) */
41 { "Zorro III exp", 0xff000000, 0xffffffff },
42 { "Zorro III cfg", 0x40000000, 0x7fffffff }
43 };
44
45 static u_int zorro_num_res __initdata = 0;
46
47
48 /*
49 * Find Zorro Devices
50 */
51
52 struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
53 {
54 struct zorro_dev *dev;
55
56 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))
57 return NULL;
58
59 for (dev = from ? from+1 : &zorro_autocon[0];
60 dev < zorro_autocon+zorro_num_autocon;
61 dev++)
62 if (id == ZORRO_WILDCARD || id == dev->id)
63 return dev;
64 return NULL;
65 }
66
67
68 /*
69 * Bitmask indicating portions of available Zorro II RAM that are unused
70 * by the system. Every bit represents a 64K chunk, for a maximum of 8MB
71 * (128 chunks, physical 0x00200000-0x009fffff).
72 *
73 * If you want to use (= allocate) portions of this RAM, you should clear
74 * the corresponding bits.
75 *
76 * Possible uses:
77 * - z2ram device
78 * - SCSI DMA bounce buffers
79 *
80 * FIXME: use the normal resource management
81 */
82
83 u32 zorro_unused_z2ram[4] = { 0, 0, 0, 0 };
84
85
86 static void __init mark_region(unsigned long start, unsigned long end,
87 int flag)
88 {
89 if (flag)
90 start += Z2RAM_CHUNKMASK;
91 else
92 end += Z2RAM_CHUNKMASK;
93 start &= ~Z2RAM_CHUNKMASK;
94 end &= ~Z2RAM_CHUNKMASK;
95
96 if (end <= Z2RAM_START || start >= Z2RAM_END)
97 return;
98 start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
99 end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
100 while (start < end) {
101 u32 chunk = start>>Z2RAM_CHUNKSHIFT;
102 if (flag)
103 set_bit(chunk, zorro_unused_z2ram);
104 else
105 clear_bit(chunk, zorro_unused_z2ram);
106 start += Z2RAM_CHUNKSIZE;
107 }
108 }
109
110
111 static struct resource __init *zorro_find_parent_resource(struct zorro_dev *z)
112 {
113 int i;
114
115 for (i = 0; i < zorro_num_res; i++)
116 if (z->resource.start >= zorro_res[i].start &&
117 z->resource.end <= zorro_res[i].end)
118 return &zorro_res[i];
119 return &iomem_resource;
120 }
121
122
123 /*
124 * Initialization
125 */
126
127 void __init zorro_init(void)
128 {
129 struct zorro_dev *dev;
130 u_int i;
131
132 if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(ZORRO))
133 return;
134
135 printk("Zorro: Probing AutoConfig expansion devices: %d device%s\n",
136 zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
137
138 /* Request the resources */
139 zorro_num_res = AMIGAHW_PRESENT(ZORRO3) ? 4 : 2;
140 for (i = 0; i < zorro_num_res; i++)
141 request_resource(&iomem_resource, &zorro_res[i]);
142 for (i = 0; i < zorro_num_autocon; i++) {
143 dev = &zorro_autocon[i];
144 dev->id = (dev->rom.er_Manufacturer<<16) | (dev->rom.er_Product<<8);
145 if (dev->id == ZORRO_PROD_GVP_EPC_BASE) {
146 /* GVP quirk */
147 unsigned long magic = dev->resource.start+0x8000;
148 dev->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
149 }
150 sprintf(dev->name, "Zorro device %08x", dev->id);
151 zorro_name_device(dev);
152 dev->resource.name = dev->name;
153 if (request_resource(zorro_find_parent_resource(dev), &dev->resource))
154 printk(KERN_ERR "Zorro: Address space collision on device %s "
155 "[%lx:%lx]\n",
156 dev->name, dev->resource.start, dev->resource.end);
157 }
158
159 /* Mark all available Zorro II memory */
160 for (i = 0; i < zorro_num_autocon; i++) {
161 dev = &zorro_autocon[i];
162 if (dev->rom.er_Type & ERTF_MEMLIST)
163 mark_region(dev->resource.start, dev->resource.end+1, 1);
164 }
165
166 /* Unmark all used Zorro II memory */
167 for (i = 0; i < m68k_num_memory; i++)
168 if (m68k_memory[i].addr < 16*1024*1024)
169 mark_region(m68k_memory[i].addr,
170 m68k_memory[i].addr+m68k_memory[i].size, 0);
171 }
172
173
174 EXPORT_SYMBOL(zorro_find_device);
175 EXPORT_SYMBOL(zorro_unused_z2ram);
176
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