1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * eisa_enumerator.c - provide support for EISA adapters in PA-RISC machines |
4 | * |
5 | * Copyright (c) 2002 Daniel Engstrom <5116@telia.com> |
6 | */ |
7 | |
8 | #include <linux/ioport.h> |
9 | #include <linux/init.h> |
10 | #include <linux/kernel.h> |
11 | #include <linux/slab.h> |
12 | #include <asm/io.h> |
13 | #include <linux/uaccess.h> |
14 | #include <asm/byteorder.h> |
15 | |
16 | #include <asm/eisa_bus.h> |
17 | #include <asm/eisa_eeprom.h> |
18 | |
19 | |
20 | /* |
21 | * Todo: |
22 | * |
23 | * PORT init with MASK attr and other size than byte |
24 | * MEMORY with other decode than 20 bit |
25 | * CRC stuff |
26 | * FREEFORM stuff |
27 | */ |
28 | |
29 | #define EPI 0xc80 |
30 | #define NUM_SLOT 16 |
31 | #define SLOT2PORT(x) (x<<12) |
32 | |
33 | |
34 | /* macros to handle unaligned accesses and |
35 | * byte swapping. The data in the EEPROM is |
36 | * little-endian on the big-endian PAROSC */ |
37 | #define get_8(x) (*(u_int8_t*)(x)) |
38 | |
39 | static inline u_int16_t get_16(const unsigned char *x) |
40 | { |
41 | return (x[1] << 8) | x[0]; |
42 | } |
43 | |
44 | static inline u_int32_t get_32(const unsigned char *x) |
45 | { |
46 | return (x[3] << 24) | (x[2] << 16) | (x[1] << 8) | x[0]; |
47 | } |
48 | |
49 | static inline u_int32_t get_24(const unsigned char *x) |
50 | { |
51 | return (x[2] << 24) | (x[1] << 16) | (x[0] << 8); |
52 | } |
53 | |
54 | static void print_eisa_id(char *s, u_int32_t id) |
55 | { |
56 | char vendor[4]; |
57 | int rev; |
58 | int device; |
59 | |
60 | rev = id & 0xff; |
61 | id >>= 8; |
62 | device = id & 0xff; |
63 | id >>= 8; |
64 | vendor[3] = '\0'; |
65 | vendor[2] = '@' + (id & 0x1f); |
66 | id >>= 5; |
67 | vendor[1] = '@' + (id & 0x1f); |
68 | id >>= 5; |
69 | vendor[0] = '@' + (id & 0x1f); |
70 | id >>= 5; |
71 | |
72 | sprintf(buf: s, fmt: "%s%02X%02X" , vendor, device, rev); |
73 | } |
74 | |
75 | static int configure_memory(const unsigned char *buf, |
76 | struct resource *mem_parent, |
77 | char *name) |
78 | { |
79 | int len; |
80 | u_int8_t c; |
81 | int i; |
82 | struct resource *res; |
83 | |
84 | len=0; |
85 | |
86 | for (i=0;i<HPEE_MEMORY_MAX_ENT;i++) { |
87 | c = get_8(buf+len); |
88 | |
89 | if (NULL != (res = kzalloc(size: sizeof(struct resource), GFP_KERNEL))) { |
90 | int result; |
91 | |
92 | res->name = name; |
93 | res->start = mem_parent->start + get_24(x: buf+len+2); |
94 | res->end = res->start + get_16(x: buf+len+5)*1024; |
95 | res->flags = IORESOURCE_MEM; |
96 | pr_cont("memory %pR " , res); |
97 | result = request_resource(root: mem_parent, new: res); |
98 | if (result < 0) { |
99 | printk(KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n" ); |
100 | return result; |
101 | } |
102 | } |
103 | |
104 | len+=7; |
105 | |
106 | if (!(c & HPEE_MEMORY_MORE)) { |
107 | break; |
108 | } |
109 | } |
110 | |
111 | return len; |
112 | } |
113 | |
114 | |
115 | static int configure_irq(const unsigned char *buf) |
116 | { |
117 | int len; |
118 | u_int8_t c; |
119 | int i; |
120 | |
121 | len=0; |
122 | |
123 | for (i=0;i<HPEE_IRQ_MAX_ENT;i++) { |
124 | c = get_8(buf+len); |
125 | |
126 | pr_cont("IRQ %d " , c & HPEE_IRQ_CHANNEL_MASK); |
127 | if (c & HPEE_IRQ_TRIG_LEVEL) { |
128 | eisa_make_irq_level(c & HPEE_IRQ_CHANNEL_MASK); |
129 | } else { |
130 | eisa_make_irq_edge(c & HPEE_IRQ_CHANNEL_MASK); |
131 | } |
132 | |
133 | len+=2; |
134 | /* hpux seems to allow for |
135 | * two bytes of irq data but only defines one of |
136 | * them, I think */ |
137 | if (!(c & HPEE_IRQ_MORE)) { |
138 | break; |
139 | } |
140 | } |
141 | |
142 | return len; |
143 | } |
144 | |
145 | |
146 | static int configure_dma(const unsigned char *buf) |
147 | { |
148 | int len; |
149 | u_int8_t c; |
150 | int i; |
151 | |
152 | len=0; |
153 | |
154 | for (i=0;i<HPEE_DMA_MAX_ENT;i++) { |
155 | c = get_8(buf+len); |
156 | pr_cont("DMA %d " , c&HPEE_DMA_CHANNEL_MASK); |
157 | /* fixme: maybe initialize the dma channel withthe timing ? */ |
158 | len+=2; |
159 | if (!(c & HPEE_DMA_MORE)) { |
160 | break; |
161 | } |
162 | } |
163 | |
164 | return len; |
165 | } |
166 | |
167 | static int configure_port(const unsigned char *buf, struct resource *io_parent, |
168 | char *board) |
169 | { |
170 | int len; |
171 | u_int8_t c; |
172 | int i; |
173 | struct resource *res; |
174 | int result; |
175 | |
176 | len=0; |
177 | |
178 | for (i=0;i<HPEE_PORT_MAX_ENT;i++) { |
179 | c = get_8(buf+len); |
180 | |
181 | if (NULL != (res = kzalloc(size: sizeof(struct resource), GFP_KERNEL))) { |
182 | res->name = board; |
183 | res->start = get_16(x: buf+len+1); |
184 | res->end = get_16(buf+len+1)+(c&HPEE_PORT_SIZE_MASK)+1; |
185 | res->flags = IORESOURCE_IO; |
186 | pr_cont("ioports %pR " , res); |
187 | result = request_resource(root: io_parent, new: res); |
188 | if (result < 0) { |
189 | printk(KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n" ); |
190 | return result; |
191 | } |
192 | } |
193 | |
194 | len+=3; |
195 | if (!(c & HPEE_PORT_MORE)) { |
196 | break; |
197 | } |
198 | } |
199 | |
200 | return len; |
201 | } |
202 | |
203 | |
204 | /* byte 1 and 2 is the port number to write |
205 | * and at byte 3 the value to write starts. |
206 | * I assume that there are and- and or- masks |
207 | * here when HPEE_PORT_INIT_MASK is set but I have |
208 | * not yet encountered this. */ |
209 | static int configure_port_init(const unsigned char *buf) |
210 | { |
211 | int len=0; |
212 | u_int8_t c; |
213 | |
214 | while (len<HPEE_PORT_INIT_MAX_LEN) { |
215 | int s=0; |
216 | c = get_8(buf+len); |
217 | |
218 | switch (c & HPEE_PORT_INIT_WIDTH_MASK) { |
219 | case HPEE_PORT_INIT_WIDTH_BYTE: |
220 | s=1; |
221 | if (c & HPEE_PORT_INIT_MASK) { |
222 | printk(KERN_WARNING "port_init: unverified mask attribute\n" ); |
223 | outb(value: (inb(port: get_16(x: buf+len+1) & |
224 | get_8(buf+len+3)) | |
225 | get_8(buf+len+4)), port: get_16(x: buf+len+1)); |
226 | |
227 | } else { |
228 | outb(get_8(buf+len+3), port: get_16(x: buf+len+1)); |
229 | |
230 | } |
231 | break; |
232 | case HPEE_PORT_INIT_WIDTH_WORD: |
233 | s=2; |
234 | if (c & HPEE_PORT_INIT_MASK) { |
235 | printk(KERN_WARNING "port_init: unverified mask attribute\n" ); |
236 | outw(value: (inw(port: get_16(x: buf+len+1)) & |
237 | get_16(x: buf+len+3)) | |
238 | get_16(x: buf+len+5), |
239 | port: get_16(x: buf+len+1)); |
240 | } else { |
241 | outw(cpu_to_le16(get_16(buf+len+3)), port: get_16(x: buf+len+1)); |
242 | } |
243 | break; |
244 | case HPEE_PORT_INIT_WIDTH_DWORD: |
245 | s=4; |
246 | if (c & HPEE_PORT_INIT_MASK) { |
247 | printk(KERN_WARNING "port_init: unverified mask attribute\n" ); |
248 | outl(value: (inl(port: get_16(x: buf+len+1) & |
249 | get_32(x: buf+len+3)) | |
250 | get_32(x: buf+len+7)), port: get_16(x: buf+len+1)); |
251 | } else { |
252 | outl(cpu_to_le32(get_32(buf+len+3)), port: get_16(x: buf+len+1)); |
253 | } |
254 | |
255 | break; |
256 | default: |
257 | printk(KERN_ERR "Invalid port init word %02x\n" , c); |
258 | return 0; |
259 | } |
260 | |
261 | if (c & HPEE_PORT_INIT_MASK) { |
262 | s*=2; |
263 | } |
264 | |
265 | len+=s+3; |
266 | if (!(c & HPEE_PORT_INIT_MORE)) { |
267 | break; |
268 | } |
269 | } |
270 | |
271 | return len; |
272 | } |
273 | |
274 | static int configure_choise(const unsigned char *buf, u_int8_t *info) |
275 | { |
276 | int len; |
277 | |
278 | /* theis record contain the value of the functions |
279 | * configuration choises and an info byte which |
280 | * describes which other records to expect in this |
281 | * function */ |
282 | len = get_8(buf); |
283 | *info=get_8(buf+len+1); |
284 | |
285 | return len+2; |
286 | } |
287 | |
288 | static int configure_type_string(const unsigned char *buf) |
289 | { |
290 | int len; |
291 | |
292 | /* just skip past the type field */ |
293 | len = get_8(buf); |
294 | if (len > 80) { |
295 | printk(KERN_ERR "eisa_enumerator: type info field too long (%d, max is 80)\n" , len); |
296 | } |
297 | |
298 | return 1+len; |
299 | } |
300 | |
301 | static int configure_function(const unsigned char *buf, int *more) |
302 | { |
303 | /* the init field seems to be a two-byte field |
304 | * which is non-zero if there are an other function following |
305 | * I think it is the length of the function def |
306 | */ |
307 | *more = get_16(x: buf); |
308 | |
309 | return 2; |
310 | } |
311 | |
312 | static int parse_slot_config(int slot, |
313 | const unsigned char *buf, |
314 | struct eeprom_eisa_slot_info *es, |
315 | struct resource *io_parent, |
316 | struct resource *mem_parent) |
317 | { |
318 | int res=0; |
319 | int function_len; |
320 | unsigned int pos=0; |
321 | unsigned int maxlen; |
322 | int num_func=0; |
323 | u_int8_t flags; |
324 | int p0; |
325 | |
326 | char *board; |
327 | int id_string_used=0; |
328 | |
329 | if (NULL == (board = kmalloc(size: 8, GFP_KERNEL))) { |
330 | return -1; |
331 | } |
332 | print_eisa_id(s: board, id: es->eisa_slot_id); |
333 | printk(KERN_INFO "EISA slot %d: %s %s " , |
334 | slot, board, es->flags&HPEE_FLAG_BOARD_IS_ISA ? "ISA" : "EISA" ); |
335 | |
336 | maxlen = es->config_data_length < HPEE_MAX_LENGTH ? |
337 | es->config_data_length : HPEE_MAX_LENGTH; |
338 | while ((pos < maxlen) && (num_func <= es->num_functions)) { |
339 | pos+=configure_function(buf: buf+pos, more: &function_len); |
340 | |
341 | if (!function_len) { |
342 | break; |
343 | } |
344 | num_func++; |
345 | p0 = pos; |
346 | pos += configure_choise(buf: buf+pos, info: &flags); |
347 | |
348 | if (flags & HPEE_FUNCTION_INFO_F_DISABLED) { |
349 | /* function disabled, skip silently */ |
350 | pos = p0 + function_len; |
351 | continue; |
352 | } |
353 | if (flags & HPEE_FUNCTION_INFO_CFG_FREE_FORM) { |
354 | /* I have no idea how to handle this */ |
355 | printk("function %d have free-form configuration, skipping " , |
356 | num_func); |
357 | pos = p0 + function_len; |
358 | continue; |
359 | } |
360 | |
361 | /* the ordering of the sections need |
362 | * more investigation. |
363 | * Currently I think that memory comaed before IRQ |
364 | * I assume the order is LSB to MSB in the |
365 | * info flags |
366 | * eg type, memory, irq, dma, port, HPEE_PORT_init |
367 | */ |
368 | |
369 | if (flags & HPEE_FUNCTION_INFO_HAVE_TYPE) { |
370 | pos += configure_type_string(buf: buf+pos); |
371 | } |
372 | |
373 | if (flags & HPEE_FUNCTION_INFO_HAVE_MEMORY) { |
374 | id_string_used=1; |
375 | pos += configure_memory(buf: buf+pos, mem_parent, name: board); |
376 | } |
377 | |
378 | if (flags & HPEE_FUNCTION_INFO_HAVE_IRQ) { |
379 | pos += configure_irq(buf: buf+pos); |
380 | } |
381 | |
382 | if (flags & HPEE_FUNCTION_INFO_HAVE_DMA) { |
383 | pos += configure_dma(buf: buf+pos); |
384 | } |
385 | |
386 | if (flags & HPEE_FUNCTION_INFO_HAVE_PORT) { |
387 | id_string_used=1; |
388 | pos += configure_port(buf: buf+pos, io_parent, board); |
389 | } |
390 | |
391 | if (flags & HPEE_FUNCTION_INFO_HAVE_PORT_INIT) { |
392 | pos += configure_port_init(buf: buf+pos); |
393 | } |
394 | |
395 | if (p0 + function_len < pos) { |
396 | printk(KERN_ERR "eisa_enumerator: function %d length mismatch " |
397 | "got %d, expected %d\n" , |
398 | num_func, pos-p0, function_len); |
399 | res=-1; |
400 | break; |
401 | } |
402 | pos = p0 + function_len; |
403 | } |
404 | pr_cont("\n" ); |
405 | if (!id_string_used) { |
406 | kfree(objp: board); |
407 | } |
408 | |
409 | if (pos != es->config_data_length) { |
410 | printk(KERN_ERR "eisa_enumerator: config data length mismatch got %d, expected %d\n" , |
411 | pos, es->config_data_length); |
412 | res=-1; |
413 | } |
414 | |
415 | if (num_func != es->num_functions) { |
416 | printk(KERN_ERR "eisa_enumerator: number of functions mismatch got %d, expected %d\n" , |
417 | num_func, es->num_functions); |
418 | res=-2; |
419 | } |
420 | |
421 | return res; |
422 | |
423 | } |
424 | |
425 | static int init_slot(int slot, struct eeprom_eisa_slot_info *es) |
426 | { |
427 | unsigned int id; |
428 | |
429 | char id_string[8]; |
430 | |
431 | if (!(es->slot_info&HPEE_SLOT_INFO_NO_READID)) { |
432 | /* try to read the id of the board in the slot */ |
433 | id = le32_to_cpu(inl(SLOT2PORT(slot)+EPI)); |
434 | |
435 | if (0xffffffff == id) { |
436 | /* Maybe we didn't expect a card to be here... */ |
437 | if (es->eisa_slot_id == 0xffffffff) |
438 | return -1; |
439 | |
440 | /* this board is not here or it does not |
441 | * support readid |
442 | */ |
443 | printk(KERN_ERR "EISA slot %d a configured board was not detected (" , |
444 | slot); |
445 | |
446 | print_eisa_id(s: id_string, id: es->eisa_slot_id); |
447 | printk(" expected %s)\n" , id_string); |
448 | |
449 | return -1; |
450 | |
451 | } |
452 | if (es->eisa_slot_id != id) { |
453 | print_eisa_id(s: id_string, id); |
454 | printk(KERN_ERR "EISA slot %d id mismatch: got %s" , |
455 | slot, id_string); |
456 | |
457 | print_eisa_id(s: id_string, id: es->eisa_slot_id); |
458 | printk(" expected %s\n" , id_string); |
459 | |
460 | return -1; |
461 | |
462 | } |
463 | } |
464 | |
465 | /* now: we need to enable the board if |
466 | * it supports enabling and run through |
467 | * the port init sction if present |
468 | * and finally record any interrupt polarity |
469 | */ |
470 | if (es->slot_features & HPEE_SLOT_FEATURES_ENABLE) { |
471 | /* enable board */ |
472 | outb(value: 0x01| inb(SLOT2PORT(slot)+EPI+4), |
473 | SLOT2PORT(slot)+EPI+4); |
474 | } |
475 | |
476 | return 0; |
477 | } |
478 | |
479 | |
480 | int eisa_enumerator(unsigned long eeprom_addr, |
481 | struct resource *io_parent, struct resource *mem_parent) |
482 | { |
483 | int i; |
484 | struct *eh; |
485 | static char eeprom_buf[HPEE_MAX_LENGTH]; |
486 | |
487 | for (i=0; i < HPEE_MAX_LENGTH; i++) { |
488 | eeprom_buf[i] = gsc_readb(eeprom_addr+i); |
489 | } |
490 | |
491 | printk(KERN_INFO "Enumerating EISA bus\n" ); |
492 | |
493 | eh = (struct eeprom_header*)(eeprom_buf); |
494 | for (i=0;i<eh->num_slots;i++) { |
495 | struct eeprom_eisa_slot_info *es; |
496 | |
497 | es = (struct eeprom_eisa_slot_info*) |
498 | (&eeprom_buf[HPEE_SLOT_INFO(i)]); |
499 | |
500 | if (-1==init_slot(slot: i+1, es)) { |
501 | continue; |
502 | } |
503 | |
504 | if (es->config_data_offset < HPEE_MAX_LENGTH) { |
505 | if (parse_slot_config(slot: i+1, buf: &eeprom_buf[es->config_data_offset], |
506 | es, io_parent, mem_parent)) { |
507 | return -1; |
508 | } |
509 | } else { |
510 | printk (KERN_WARNING "EISA EEPROM offset 0x%x out of range\n" ,es->config_data_offset); |
511 | return -1; |
512 | } |
513 | } |
514 | return eh->num_slots; |
515 | } |
516 | |
517 | |