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Linux/drivers/zorro/zorro.c

  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/byteorder.h>
 22 #include <asm/setup.h>
 23 #include <asm/amigahw.h>
 24 
 25 #include "zorro.h"
 26 
 27 
 28     /*
 29      *  Zorro Expansion Devices
 30      */
 31 
 32 unsigned int zorro_num_autocon;
 33 struct zorro_dev_init zorro_autocon_init[ZORRO_NUM_AUTO] __initdata;
 34 struct zorro_dev *zorro_autocon;
 35 
 36 
 37     /*
 38      *  Zorro bus
 39      */
 40 
 41 struct zorro_bus {
 42         struct device dev;
 43         struct zorro_dev devices[0];
 44 };
 45 
 46 
 47     /*
 48      *  Find Zorro Devices
 49      */
 50 
 51 struct zorro_dev *zorro_find_device(zorro_id id, struct zorro_dev *from)
 52 {
 53         struct zorro_dev *z;
 54 
 55         if (!zorro_num_autocon)
 56                 return NULL;
 57 
 58         for (z = from ? from+1 : &zorro_autocon[0];
 59              z < zorro_autocon+zorro_num_autocon;
 60              z++)
 61                 if (id == ZORRO_WILDCARD || id == z->id)
 62                         return z;
 63         return NULL;
 64 }
 65 EXPORT_SYMBOL(zorro_find_device);
 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 DECLARE_BITMAP(zorro_unused_z2ram, 128);
 84 EXPORT_SYMBOL(zorro_unused_z2ram);
 85 
 86 
 87 static void __init mark_region(unsigned long start, unsigned long end,
 88                                int flag)
 89 {
 90         if (flag)
 91                 start += Z2RAM_CHUNKMASK;
 92         else
 93                 end += Z2RAM_CHUNKMASK;
 94         start &= ~Z2RAM_CHUNKMASK;
 95         end &= ~Z2RAM_CHUNKMASK;
 96 
 97         if (end <= Z2RAM_START || start >= Z2RAM_END)
 98                 return;
 99         start = start < Z2RAM_START ? 0x00000000 : start-Z2RAM_START;
100         end = end > Z2RAM_END ? Z2RAM_SIZE : end-Z2RAM_START;
101         while (start < end) {
102                 u32 chunk = start>>Z2RAM_CHUNKSHIFT;
103                 if (flag)
104                         set_bit(chunk, zorro_unused_z2ram);
105                 else
106                         clear_bit(chunk, zorro_unused_z2ram);
107                 start += Z2RAM_CHUNKSIZE;
108         }
109 }
110 
111 
112 static struct resource __init *zorro_find_parent_resource(
113         struct platform_device *bridge, struct zorro_dev *z)
114 {
115         int i;
116 
117         for (i = 0; i < bridge->num_resources; i++) {
118                 struct resource *r = &bridge->resource[i];
119                 if (zorro_resource_start(z) >= r->start &&
120                     zorro_resource_end(z) <= r->end)
121                         return r;
122         }
123         return &iomem_resource;
124 }
125 
126 
127 
128 static int __init amiga_zorro_probe(struct platform_device *pdev)
129 {
130         struct zorro_bus *bus;
131         struct zorro_dev_init *zi;
132         struct zorro_dev *z;
133         struct resource *r;
134         unsigned int i;
135         int error;
136 
137         /* Initialize the Zorro bus */
138         bus = kzalloc(sizeof(*bus) +
139                       zorro_num_autocon * sizeof(bus->devices[0]),
140                       GFP_KERNEL);
141         if (!bus)
142                 return -ENOMEM;
143 
144         zorro_autocon = bus->devices;
145         bus->dev.parent = &pdev->dev;
146         dev_set_name(&bus->dev, zorro_bus_type.name);
147         error = device_register(&bus->dev);
148         if (error) {
149                 pr_err("Zorro: Error registering zorro_bus\n");
150                 put_device(&bus->dev);
151                 kfree(bus);
152                 return error;
153         }
154         platform_set_drvdata(pdev, bus);
155 
156         pr_info("Zorro: Probing AutoConfig expansion devices: %u device%s\n",
157                  zorro_num_autocon, zorro_num_autocon == 1 ? "" : "s");
158 
159         /* First identify all devices ... */
160         for (i = 0; i < zorro_num_autocon; i++) {
161                 zi = &zorro_autocon_init[i];
162                 z = &zorro_autocon[i];
163 
164                 z->rom = zi->rom;
165                 z->id = (be16_to_cpu(z->rom.er_Manufacturer) << 16) |
166                         (z->rom.er_Product << 8);
167                 if (z->id == ZORRO_PROD_GVP_EPC_BASE) {
168                         /* GVP quirk */
169                         unsigned long magic = zi->boardaddr + 0x8000;
170                         z->id |= *(u16 *)ZTWO_VADDR(magic) & GVP_PRODMASK;
171                 }
172                 z->slotaddr = zi->slotaddr;
173                 z->slotsize = zi->slotsize;
174                 sprintf(z->name, "Zorro device %08x", z->id);
175                 zorro_name_device(z);
176                 z->resource.start = zi->boardaddr;
177                 z->resource.end = zi->boardaddr + zi->boardsize - 1;
178                 z->resource.name = z->name;
179                 r = zorro_find_parent_resource(pdev, z);
180                 error = request_resource(r, &z->resource);
181                 if (error)
182                         dev_err(&bus->dev,
183                                 "Address space collision on device %s %pR\n",
184                                 z->name, &z->resource);
185                 z->dev.parent = &bus->dev;
186                 z->dev.bus = &zorro_bus_type;
187                 z->dev.id = i;
188         }
189 
190         /* ... then register them */
191         for (i = 0; i < zorro_num_autocon; i++) {
192                 z = &zorro_autocon[i];
193                 error = device_register(&z->dev);
194                 if (error) {
195                         dev_err(&bus->dev, "Error registering device %s\n",
196                                 z->name);
197                         put_device(&z->dev);
198                         continue;
199                 }
200                 error = zorro_create_sysfs_dev_files(z);
201                 if (error)
202                         dev_err(&z->dev, "Error creating sysfs files\n");
203         }
204 
205         /* Mark all available Zorro II memory */
206         zorro_for_each_dev(z) {
207                 if (z->rom.er_Type & ERTF_MEMLIST)
208                         mark_region(zorro_resource_start(z),
209                                     zorro_resource_end(z)+1, 1);
210         }
211 
212         /* Unmark all used Zorro II memory */
213         for (i = 0; i < m68k_num_memory; i++)
214                 if (m68k_memory[i].addr < 16*1024*1024)
215                         mark_region(m68k_memory[i].addr,
216                                     m68k_memory[i].addr+m68k_memory[i].size,
217                                     0);
218 
219         return 0;
220 }
221 
222 static struct platform_driver amiga_zorro_driver = {
223         .driver   = {
224                 .name   = "amiga-zorro",
225                 .owner  = THIS_MODULE,
226         },
227 };
228 
229 static int __init amiga_zorro_init(void)
230 {
231         return platform_driver_probe(&amiga_zorro_driver, amiga_zorro_probe);
232 }
233 
234 module_init(amiga_zorro_init);
235 
236 MODULE_LICENSE("GPL");
237 

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