Linux Kernel  3.7.1
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dio.c
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1 /* Code to support devices on the DIO and DIO-II bus
2  * Copyright (C) 05/1998 Peter Maydell <[email protected]>
3  * Copyright (C) 2004 Jochen Friedrich <[email protected]>
4  *
5  * This code has basically these routines at the moment:
6  * int dio_find(u_int deviceid)
7  * Search the list of DIO devices and return the select code
8  * of the next unconfigured device found that matches the given device ID.
9  * Note that the deviceid parameter should be the encoded ID.
10  * This means that framebuffers should pass it as
11  * DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
12  * (or whatever); everybody else just uses DIO_ID_FOOBAR.
13  * unsigned long dio_scodetophysaddr(int scode)
14  * Return the physical address corresponding to the given select code.
15  * int dio_scodetoipl(int scode)
16  * Every DIO card has a fixed interrupt priority level. This function
17  * returns it, whatever it is.
18  * const char *dio_scodetoname(int scode)
19  * Return a character string describing this board [might be "" if
20  * not CONFIG_DIO_CONSTANTS]
21  * void dio_config_board(int scode) mark board as configured in the list
22  * void dio_unconfig_board(int scode) mark board as no longer configured
23  *
24  * This file is based on the way the Amiga port handles Zorro II cards,
25  * although we aren't so complicated...
26  */
27 #include <linux/module.h>
28 #include <linux/string.h>
29 #include <linux/types.h>
30 #include <linux/kernel.h>
31 #include <linux/init.h>
32 #include <linux/dio.h>
33 #include <linux/slab.h> /* kmalloc() */
34 #include <asm/uaccess.h>
35 #include <asm/io.h> /* readb() */
36 
37 struct dio_bus dio_bus = {
38  .resources = {
39  /* DIO range */
40  { .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },
41  /* DIO-II range */
42  { .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }
43  },
44  .name = "DIO bus"
45 };
46 
47 /* not a real config option yet! */
48 #define CONFIG_DIO_CONSTANTS
49 
50 #ifdef CONFIG_DIO_CONSTANTS
51 /* We associate each numeric ID with an appropriate descriptive string
52  * using a constant array of these structs.
53  * FIXME: we should be able to arrange to throw away most of the strings
54  * using the initdata stuff. Then we wouldn't need to worry about
55  * carrying them around...
56  * I think we do this by copying them into newly kmalloc()ed memory and
57  * marking the names[] array as .initdata ?
58  */
59 struct dioname
60 {
61  int id;
62  const char *name;
63 };
64 
65 /* useful macro */
66 #define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x }
67 #define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x }
68 
69 static struct dioname names[] =
70 {
71  DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
72  DIONAME(DCM), DIONAME(DCMREM),
73  DIONAME(LAN),
74  DIONAME(FHPIB), DIONAME(NHPIB),
76  DIONAME(FBUFFER),
77  DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
78  DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
79  DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
80  DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),
81  DIONAME(MISC12), DIONAME(MISC13),
82  DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
83  DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
84  DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
85  DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)
86 };
87 
88 #undef DIONAME
89 #undef DIOFBNAME
90 
91 static const char *unknowndioname
92  = "unknown DIO board -- please email <[email protected]>!";
93 
94 static const char *dio_getname(int id)
95 {
96  /* return pointer to a constant string describing the board with given ID */
97  unsigned int i;
98  for (i = 0; i < ARRAY_SIZE(names); i++)
99  if (names[i].id == id)
100  return names[i].name;
101 
102  return unknowndioname;
103 }
104 
105 #else
106 
107 static char dio_no_name[] = { 0 };
108 #define dio_getname(_id) (dio_no_name)
109 
110 #endif /* CONFIG_DIO_CONSTANTS */
111 
113 {
114  /* Called to find a DIO device before the full bus scan has run.
115  * Only used by the console driver.
116  */
117  int scode, id;
118  u_char prid, secid, i;
120 
121  for (scode = 0; scode < DIO_SCMAX; scode++) {
122  void *va;
123  unsigned long pa;
124 
125  if (DIO_SCINHOLE(scode))
126  continue;
127 
128  pa = dio_scodetophysaddr(scode);
129 
130  if (!pa)
131  continue;
132 
133  if (scode < DIOII_SCBASE)
134  va = (void *)(pa + DIO_VIRADDRBASE);
135  else
136  va = ioremap(pa, PAGE_SIZE);
137 
138  fs = get_fs();
139  set_fs(KERNEL_DS);
140 
141  if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
142  set_fs(fs);
143  if (scode >= DIOII_SCBASE)
144  iounmap(va);
145  continue; /* no board present at that select code */
146  }
147 
148  set_fs(fs);
149  prid = DIO_ID(va);
150 
151  if (DIO_NEEDSSECID(prid)) {
152  secid = DIO_SECID(va);
153  id = DIO_ENCODE_ID(prid, secid);
154  } else
155  id = prid;
156 
157  if (id == deviceid) {
158  if (scode >= DIOII_SCBASE)
159  iounmap(va);
160  return scode;
161  }
162  }
163 
164  return -1;
165 }
166 
167 /* This is the function that scans the DIO space and works out what
168  * hardware is actually present.
169  */
170 static int __init dio_init(void)
171 {
172  int scode;
174  int i;
175  struct dio_dev *dev;
176  int error;
177 
178  if (!MACH_IS_HP300)
179  return 0;
180 
181  printk(KERN_INFO "Scanning for DIO devices...\n");
182 
183  /* Initialize the DIO bus */
184  INIT_LIST_HEAD(&dio_bus.devices);
185  dev_set_name(&dio_bus.dev, "dio");
186  error = device_register(&dio_bus.dev);
187  if (error) {
188  pr_err("DIO: Error registering dio_bus\n");
189  return error;
190  }
191 
192  /* Request all resources */
193  dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2);
194  for (i = 0; i < dio_bus.num_resources; i++)
195  request_resource(&iomem_resource, &dio_bus.resources[i]);
196 
197  /* Register all devices */
198  for (scode = 0; scode < DIO_SCMAX; ++scode)
199  {
200  u_char prid, secid = 0; /* primary, secondary ID bytes */
201  u_char *va;
202  unsigned long pa;
203 
204  if (DIO_SCINHOLE(scode))
205  continue;
206 
207  pa = dio_scodetophysaddr(scode);
208 
209  if (!pa)
210  continue;
211 
212  if (scode < DIOII_SCBASE)
213  va = (void *)(pa + DIO_VIRADDRBASE);
214  else
215  va = ioremap(pa, PAGE_SIZE);
216 
217  fs = get_fs();
218  set_fs(KERNEL_DS);
219 
220  if (get_user(i, (unsigned char *)va + DIO_IDOFF)) {
221  set_fs(fs);
222  if (scode >= DIOII_SCBASE)
223  iounmap(va);
224  continue; /* no board present at that select code */
225  }
226 
227  set_fs(fs);
228 
229  /* Found a board, allocate it an entry in the list */
230  dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL);
231  if (!dev)
232  return 0;
233 
234  dev->bus = &dio_bus;
235  dev->dev.parent = &dio_bus.dev;
236  dev->dev.bus = &dio_bus_type;
237  dev->scode = scode;
238  dev->resource.start = pa;
239  dev->resource.end = pa + DIO_SIZE(scode, va);
240  dev_set_name(&dev->dev, "%02x", scode);
241 
242  /* read the ID byte(s) and encode if necessary. */
243  prid = DIO_ID(va);
244 
245  if (DIO_NEEDSSECID(prid)) {
246  secid = DIO_SECID(va);
247  dev->id = DIO_ENCODE_ID(prid, secid);
248  } else
249  dev->id = prid;
250 
251  dev->ipl = DIO_IPL(va);
252  strcpy(dev->name,dio_getname(dev->id));
253  printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid);
254  if (DIO_NEEDSSECID(prid))
255  printk(":%02X", secid);
256  printk(": %s\n", dev->name);
257 
258  if (scode >= DIOII_SCBASE)
259  iounmap(va);
260  error = device_register(&dev->dev);
261  if (error) {
262  pr_err("DIO: Error registering device %s\n",
263  dev->name);
264  continue;
265  }
266  error = dio_create_sysfs_dev_files(dev);
267  if (error)
268  dev_err(&dev->dev, "Error creating sysfs files\n");
269  }
270  return 0;
271 }
272 
273 subsys_initcall(dio_init);
274 
275 /* Bear in mind that this is called in the very early stages of initialisation
276  * in order to get the address of the serial port for the console...
277  */
278 unsigned long dio_scodetophysaddr(int scode)
279 {
280  if (scode >= DIOII_SCBASE) {
281  return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE);
282  } else if (scode > DIO_SCMAX || scode < 0)
283  return 0;
284  else if (DIO_SCINHOLE(scode))
285  return 0;
286 
287  return (DIO_BASE + scode * DIO_DEVSIZE);
288 }