xref: /openbmc/linux/drivers/zorro/zorro.c (revision ea2abe2f)
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 
33 unsigned int zorro_num_autocon;
34 struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
35 struct zorro_dev *zorro_autocon;
36 
37 
38     /*
39      *  Zorro bus
40      */
41 
42 struct zorro_bus {
43 	struct device dev;
44 	struct zorro_dev devices[];
45 };
46 
47 
48     /*
49      *  Find Zorro Devices
50      */
51 
zorro_find_device(zorro_id id,struct zorro_dev * from)52 struct 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 }
66 EXPORT_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 
84 DECLARE_BITMAP(zorro_unused_z2ram, 128);
85 EXPORT_SYMBOL(zorro_unused_z2ram);
86 
87 
mark_region(unsigned long start,unsigned long end,int flag)88 static 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 
zorro_find_parent_resource(struct platform_device * bridge,struct zorro_dev * z)114 static 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 
amiga_zorro_probe(struct platform_device * pdev)131 static 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 
233 static struct platform_driver amiga_zorro_driver = {
234 	.driver   = {
235 		.name	= "amiga-zorro",
236 	},
237 };
238 
amiga_zorro_init(void)239 static int __init amiga_zorro_init(void)
240 {
241 	return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
242 }
243 
244 module_init(amiga_zorro_init);
245 
246 MODULE_LICENSE("GPL");
247