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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* Code to support devices on the DIO and DIO-II bus |
3 | * Copyright (C) 05/1998 Peter Maydell <pmaydell@chiark.greenend.org.uk> | |
4 | * Copyright (C) 2004 Jochen Friedrich <jochen@scram.de> | |
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() */ | |
7c0f6ba6 | 35 | #include <linux/uaccess.h> |
1da177e4 LT |
36 | #include <asm/io.h> /* readb() */ |
37 | ||
38 | struct 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 | */ | |
60 | struct dioname | |
61 | { | |
62 | int id; | |
63 | const char *name; | |
64 | }; | |
65 | ||
66 | /* useful macro */ | |
67 | #define DIONAME(x) { DIO_ID_##x, DIO_DESC_##x } | |
68 | #define DIOFBNAME(x) { DIO_ENCODE_ID( DIO_ID_FBUFFER, DIO_ID2_##x), DIO_DESC2_##x } | |
69 | ||
70 | static struct dioname names[] = | |
71 | { | |
72 | DIONAME(DCA0), DIONAME(DCA0REM), DIONAME(DCA1), DIONAME(DCA1REM), | |
73 | DIONAME(DCM), DIONAME(DCMREM), | |
74 | DIONAME(LAN), | |
75 | DIONAME(FHPIB), DIONAME(NHPIB), | |
76 | DIONAME(SCSI0), DIONAME(SCSI1), DIONAME(SCSI2), DIONAME(SCSI3), | |
77 | DIONAME(FBUFFER), | |
78 | DIONAME(PARALLEL), DIONAME(VME), DIONAME(DCL), DIONAME(DCLREM), | |
79 | DIONAME(MISC0), DIONAME(MISC1), DIONAME(MISC2), DIONAME(MISC3), | |
80 | DIONAME(MISC4), DIONAME(MISC5), DIONAME(MISC6), DIONAME(MISC7), | |
81 | DIONAME(MISC8), DIONAME(MISC9), DIONAME(MISC10), DIONAME(MISC11), | |
82 | DIONAME(MISC12), DIONAME(MISC13), | |
83 | DIOFBNAME(GATORBOX), DIOFBNAME(TOPCAT), DIOFBNAME(RENAISSANCE), | |
84 | DIOFBNAME(LRCATSEYE), DIOFBNAME(HRCCATSEYE), DIOFBNAME(HRMCATSEYE), | |
85 | DIOFBNAME(DAVINCI), DIOFBNAME(XXXCATSEYE), DIOFBNAME(HYPERION), | |
86 | DIOFBNAME(XGENESIS), DIOFBNAME(TIGER), DIOFBNAME(YGENESIS) | |
87 | }; | |
88 | ||
89 | #undef DIONAME | |
90 | #undef DIOFBNAME | |
91 | ||
627f192d GU |
92 | static const char unknowndioname[] |
93 | = "unknown DIO board, please email linux-m68k@lists.linux-m68k.org"; | |
1da177e4 LT |
94 | |
95 | static const char *dio_getname(int id) | |
96 | { | |
97 | /* return pointer to a constant string describing the board with given ID */ | |
98 | unsigned int i; | |
0a8320b0 | 99 | for (i = 0; i < ARRAY_SIZE(names); i++) |
1da177e4 LT |
100 | if (names[i].id == id) |
101 | return names[i].name; | |
102 | ||
103 | return unknowndioname; | |
104 | } | |
105 | ||
106 | #else | |
107 | ||
108 | static char dio_no_name[] = { 0 }; | |
109 | #define dio_getname(_id) (dio_no_name) | |
110 | ||
111 | #endif /* CONFIG_DIO_CONSTANTS */ | |
112 | ||
113 | int __init dio_find(int deviceid) | |
114 | { | |
115 | /* Called to find a DIO device before the full bus scan has run. | |
116 | * Only used by the console driver. | |
117 | */ | |
118 | int scode, id; | |
119 | u_char prid, secid, i; | |
1da177e4 LT |
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 | ||
fe557319 CH |
138 | if (copy_from_kernel_nofault(&i, |
139 | (unsigned char *)va + DIO_IDOFF, 1)) { | |
1da177e4 LT |
140 | if (scode >= DIOII_SCBASE) |
141 | iounmap(va); | |
142 | continue; /* no board present at that select code */ | |
143 | } | |
144 | ||
1da177e4 LT |
145 | prid = DIO_ID(va); |
146 | ||
147 | if (DIO_NEEDSSECID(prid)) { | |
148 | secid = DIO_SECID(va); | |
149 | id = DIO_ENCODE_ID(prid, secid); | |
150 | } else | |
151 | id = prid; | |
152 | ||
153 | if (id == deviceid) { | |
154 | if (scode >= DIOII_SCBASE) | |
155 | iounmap(va); | |
156 | return scode; | |
157 | } | |
158 | } | |
159 | ||
160 | return -1; | |
161 | } | |
162 | ||
163 | /* This is the function that scans the DIO space and works out what | |
164 | * hardware is actually present. | |
165 | */ | |
166 | static int __init dio_init(void) | |
167 | { | |
168 | int scode; | |
1da177e4 LT |
169 | int i; |
170 | struct dio_dev *dev; | |
2e4c77be | 171 | int error; |
1da177e4 LT |
172 | |
173 | if (!MACH_IS_HP300) | |
174 | return 0; | |
175 | ||
176 | printk(KERN_INFO "Scanning for DIO devices...\n"); | |
177 | ||
178 | /* Initialize the DIO bus */ | |
179 | INIT_LIST_HEAD(&dio_bus.devices); | |
9591463a | 180 | dev_set_name(&dio_bus.dev, "dio"); |
2e4c77be GU |
181 | error = device_register(&dio_bus.dev); |
182 | if (error) { | |
183 | pr_err("DIO: Error registering dio_bus\n"); | |
184 | return error; | |
185 | } | |
1da177e4 LT |
186 | |
187 | /* Request all resources */ | |
188 | dio_bus.num_resources = (hp300_model == HP_320 ? 1 : 2); | |
189 | for (i = 0; i < dio_bus.num_resources; i++) | |
190 | request_resource(&iomem_resource, &dio_bus.resources[i]); | |
191 | ||
192 | /* Register all devices */ | |
193 | for (scode = 0; scode < DIO_SCMAX; ++scode) | |
194 | { | |
195 | u_char prid, secid = 0; /* primary, secondary ID bytes */ | |
196 | u_char *va; | |
197 | unsigned long pa; | |
198 | ||
199 | if (DIO_SCINHOLE(scode)) | |
200 | continue; | |
201 | ||
202 | pa = dio_scodetophysaddr(scode); | |
203 | ||
204 | if (!pa) | |
205 | continue; | |
206 | ||
207 | if (scode < DIOII_SCBASE) | |
208 | va = (void *)(pa + DIO_VIRADDRBASE); | |
209 | else | |
210 | va = ioremap(pa, PAGE_SIZE); | |
211 | ||
fe557319 CH |
212 | if (copy_from_kernel_nofault(&i, |
213 | (unsigned char *)va + DIO_IDOFF, 1)) { | |
1da177e4 LT |
214 | if (scode >= DIOII_SCBASE) |
215 | iounmap(va); | |
216 | continue; /* no board present at that select code */ | |
217 | } | |
218 | ||
1da177e4 | 219 | /* Found a board, allocate it an entry in the list */ |
e66860cb | 220 | dev = kzalloc(sizeof(struct dio_dev), GFP_KERNEL); |
1da177e4 LT |
221 | if (!dev) |
222 | return 0; | |
223 | ||
1da177e4 LT |
224 | dev->bus = &dio_bus; |
225 | dev->dev.parent = &dio_bus.dev; | |
226 | dev->dev.bus = &dio_bus_type; | |
227 | dev->scode = scode; | |
228 | dev->resource.start = pa; | |
229 | dev->resource.end = pa + DIO_SIZE(scode, va); | |
9591463a | 230 | dev_set_name(&dev->dev, "%02x", scode); |
1da177e4 LT |
231 | |
232 | /* read the ID byte(s) and encode if necessary. */ | |
233 | prid = DIO_ID(va); | |
234 | ||
235 | if (DIO_NEEDSSECID(prid)) { | |
236 | secid = DIO_SECID(va); | |
237 | dev->id = DIO_ENCODE_ID(prid, secid); | |
238 | } else | |
239 | dev->id = prid; | |
240 | ||
241 | dev->ipl = DIO_IPL(va); | |
242 | strcpy(dev->name,dio_getname(dev->id)); | |
243 | printk(KERN_INFO "select code %3d: ipl %d: ID %02X", dev->scode, dev->ipl, prid); | |
244 | if (DIO_NEEDSSECID(prid)) | |
245 | printk(":%02X", secid); | |
246 | printk(": %s\n", dev->name); | |
247 | ||
248 | if (scode >= DIOII_SCBASE) | |
249 | iounmap(va); | |
2e4c77be GU |
250 | error = device_register(&dev->dev); |
251 | if (error) { | |
252 | pr_err("DIO: Error registering device %s\n", | |
253 | dev->name); | |
254 | continue; | |
255 | } | |
256 | error = dio_create_sysfs_dev_files(dev); | |
257 | if (error) | |
258 | dev_err(&dev->dev, "Error creating sysfs files\n"); | |
1da177e4 LT |
259 | } |
260 | return 0; | |
261 | } | |
262 | ||
263 | subsys_initcall(dio_init); | |
264 | ||
265 | /* Bear in mind that this is called in the very early stages of initialisation | |
266 | * in order to get the address of the serial port for the console... | |
267 | */ | |
268 | unsigned long dio_scodetophysaddr(int scode) | |
269 | { | |
270 | if (scode >= DIOII_SCBASE) { | |
271 | return (DIOII_BASE + (scode - 132) * DIOII_DEVSIZE); | |
272 | } else if (scode > DIO_SCMAX || scode < 0) | |
273 | return 0; | |
274 | else if (DIO_SCINHOLE(scode)) | |
275 | return 0; | |
276 | ||
277 | return (DIO_BASE + scode * DIO_DEVSIZE); | |
278 | } |