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1// SPDX-License-Identifier: GPL-2.0
2/* Code to support devices on the DIO and DIO-II bus
3 * Copyright (C) 05/1998 Peter Maydell <[email protected]>
4 * Copyright (C) 2004 Jochen Friedrich <[email protected]>
5 *
6 * This code has basically these routines at the moment:
7 * int dio_find(u_int deviceid)
8 * Search the list of DIO devices and return the select code
9 * of the next unconfigured device found that matches the given device ID.
10 * Note that the deviceid parameter should be the encoded ID.
11 * This means that framebuffers should pass it as
12 * DIO_ENCODE_ID(DIO_ID_FBUFFER,DIO_ID2_TOPCAT)
13 * (or whatever); everybody else just uses DIO_ID_FOOBAR.
14 * unsigned long dio_scodetophysaddr(int scode)
15 * Return the physical address corresponding to the given select code.
16 * int dio_scodetoipl(int scode)
17 * Every DIO card has a fixed interrupt priority level. This function
18 * returns it, whatever it is.
19 * const char *dio_scodetoname(int scode)
20 * Return a character string describing this board [might be "" if
21 * not CONFIG_DIO_CONSTANTS]
22 * void dio_config_board(int scode) mark board as configured in the list
23 * void dio_unconfig_board(int scode) mark board as no longer configured
24 *
25 * This file is based on the way the Amiga port handles Zorro II cards,
26 * although we aren't so complicated...
27 */
28#include <linux/module.h>
29#include <linux/string.h>
30#include <linux/types.h>
31#include <linux/kernel.h>
32#include <linux/init.h>
33#include <linux/dio.h>
34#include <linux/slab.h> /* kmalloc() */
35#include <linux/uaccess.h>
36#include <linux/io.h> /* readb() */
37
38struct dio_bus dio_bus = {
39 .resources = {
40 /* DIO range */
41 { .name = "DIO mem", .start = 0x00600000, .end = 0x007fffff },
42 /* DIO-II range */
43 { .name = "DIO-II mem", .start = 0x01000000, .end = 0x1fffffff }
44 },
45 .name = "DIO bus"
46};
47
48/* not a real config option yet! */
49#define CONFIG_DIO_CONSTANTS
50
51#ifdef CONFIG_DIO_CONSTANTS
52/* We associate each numeric ID with an appropriate descriptive string
53 * using a constant array of these structs.
54 * FIXME: we should be able to arrange to throw away most of the strings
55 * using the initdata stuff. Then we wouldn't need to worry about
56 * carrying them around...
57 * I think we do this by copying them into newly kmalloc()ed memory and
58 * marking the names[] array as .initdata ?
59 */
60struct dioname {
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
69static struct dioname names[] = {
70 DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM),
71 DIONAME(DCM), DIONAME(DCMREM),
72 DIONAME(LAN),
73 DIONAME(FHPIB), DIONAME(NHPIB),
74 DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3),
75 DIONAME(FBUFFER),
76 DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM),
77 DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3),
78 DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7),
79 DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11),
80 DIONAME(MISC12), DIONAME(MISC13),
81 DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE),
82 DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE),
83 DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION),
84 DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS)
85};
86
87#undef DIONAME
88#undef DIOFBNAME
89
90static const char unknowndioname[]
91 = "unknown DIO board, please email [email protected]";
92
93static const char *dio_getname(int id)
94{
95 /* return pointer to a constant string describing the board with given ID */
96 unsigned int i;
97
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
107static char dio_no_name[] = { 0 };
108#define dio_getname(_id) (dio_no_name)
109
110#endif /* CONFIG_DIO_CONSTANTS */
111
112static void dio_dev_release(struct device *dev)
113{
114 struct dio_dev *ddev = container_of(dev, typeof(struct dio_dev), dev);
115 kfree(ddev);
116}
117
118int __init dio_find(int deviceid)
119{
120 /* Called to find a DIO device before the full bus scan has run.
121 * Only used by the console driver.
122 */
123 int scode, id;
124 u_char prid, secid, i;
125
126 for (scode = 0; scode < DIO_SCMAX; scode++) {
127 void *va;
128 unsigned long pa;
129
130 if (DIO_SCINHOLE(scode))
131 continue;
132
133 pa = dio_scodetophysaddr(scode);
134
135 if (!pa)
136 continue;
137
138 if (scode < DIOII_SCBASE)
139 va = (void *)(pa + DIO_VIRADDRBASE);
140 else
141 va = ioremap(pa, PAGE_SIZE);
142
143 if (copy_from_kernel_nofault(&i,
144 (unsigned char *)va + DIO_IDOFF, 1)) {
145 if (scode >= DIOII_SCBASE)
146 iounmap(va);
147 continue; /* no board present at that select code */
148 }
149
150 prid = DIO_ID(va);
151
152 if (DIO_NEEDSSECID(prid)) {
153 secid = DIO_SECID(va);
154 id = DIO_ENCODE_ID(prid, secid);
155 } else
156 id = prid;
157
158 if (id == deviceid) {
159 if (scode >= DIOII_SCBASE)
160 iounmap(va);
161 return scode;
162 }
163 }
164
165 return -1;
166}
167
168/* This is the function that scans the DIO space and works out what
169 * hardware is actually present.
170 */
171static int __init dio_init(void)
172{
173 int scode;
174 int i;
175 struct dio_dev *dev;
176 int error;
177
178 if (!MACH_IS_HP300)
179 return 0;
180
181 pr_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 u_char prid, secid = 0; /* primary, secondary ID bytes */
200 u_char *va;
201 unsigned long pa;
202
203 if (DIO_SCINHOLE(scode))
204 continue;
205
206 pa = dio_scodetophysaddr(scode);
207
208 if (!pa)
209 continue;
210
211 if (scode < DIOII_SCBASE)
212 va = (void *)(pa + DIO_VIRADDRBASE);
213 else
214 va = ioremap(pa, PAGE_SIZE);
215
216 if (copy_from_kernel_nofault(&i,
217 (unsigned char *)va + DIO_IDOFF, 1)) {
218 if (scode >= DIOII_SCBASE)
219 iounmap(va);
220 continue; /* no board present at that select code */
221 }
222
223 /* Found a board, allocate it an entry in the list */
224 dev = kzalloc_obj(struct dio_dev);
225 if (!dev) {
226 if (scode >= DIOII_SCBASE)
227 iounmap(va);
228 return -ENOMEM;
229 }
230
231 dev->bus = &dio_bus;
232 dev->dev.parent = &dio_bus.dev;
233 dev->dev.bus = &dio_bus_type;
234 dev->dev.release = dio_dev_release;
235 dev->scode = scode;
236 dev->resource.start = pa;
237 dev->resource.end = pa + DIO_SIZE(scode, va);
238 dev_set_name(&dev->dev, "%02x", scode);
239
240 /* read the ID byte(s) and encode if necessary. */
241 prid = DIO_ID(va);
242
243 if (DIO_NEEDSSECID(prid)) {
244 secid = DIO_SECID(va);
245 dev->id = DIO_ENCODE_ID(prid, secid);
246 } else
247 dev->id = prid;
248
249 dev->ipl = DIO_IPL(va);
250 strscpy(dev->name, dio_getname(dev->id));
251 if (DIO_NEEDSSECID(prid))
252 pr_info("select code %3d: ipl %u: ID %02X:%02X: %s\n",
253 dev->scode, dev->ipl, prid, secid, dev->name);
254 else
255 pr_info("select code %3d: ipl %u: ID %02X: %s\n",
256 dev->scode, dev->ipl, prid, 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", dev->name);
263 put_device(&dev->dev);
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
273subsys_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 */
278unsigned 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}