summaryrefslogblamecommitdiff
path: root/drivers/parisc/eisa_enumerator.c
blob: 6d8aae003f6c19c9fd733766b897d082ccb7a657 (plain) (tree)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521








































































































































































































































































































































































































































































































































                                                                                                                   
/*
 * eisa_enumerator.c - provide support for EISA adapters in PA-RISC machines
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 * Copyright (c) 2002 Daniel Engstrom <5116@telia.com>
 *
 */

#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/byteorder.h>

#include <asm/eisa_bus.h>
#include <asm/eisa_eeprom.h>


/*
 * Todo:
 * 
 * PORT init with MASK attr and other size than byte
 * MEMORY with other decode than 20 bit
 * CRC stuff
 * FREEFORM stuff
 */

#define EPI 0xc80
#define NUM_SLOT 16
#define SLOT2PORT(x) (x<<12)


/* macros to handle unaligned accesses and 
 * byte swapping. The data in the EEPROM is
 * little-endian on the big-endian PAROSC */
#define get_8(x) (*(u_int8_t*)(x))

static inline u_int16_t get_16(const unsigned char *x)
{ 
	return (x[1] << 8) | x[0];
}

static inline u_int32_t get_32(const unsigned char *x)
{
	return (x[3] << 24) | (x[2] << 16) | (x[1] << 8) | x[0];
}

static inline u_int32_t get_24(const unsigned char *x)
{
	return (x[2] << 24) | (x[1] << 16) | (x[0] << 8);
}

static void print_eisa_id(char *s, u_int32_t id)
{
	char vendor[4];
	int rev;
	int device;
	
	rev = id & 0xff;
	id >>= 8;
	device = id & 0xff;
	id >>= 8;
	vendor[3] = '\0';
	vendor[2] = '@' + (id & 0x1f);
	id >>= 5;	
	vendor[1] = '@' + (id & 0x1f);
	id >>= 5;	
	vendor[0] = '@' + (id & 0x1f);
	id >>= 5;	
	
	sprintf(s, "%s%02X%02X", vendor, device, rev);
}
       
static int configure_memory(const unsigned char *buf, 
		       struct resource *mem_parent,
		       char *name)
{
	int len;
	u_int8_t c;
	int i;
	struct resource *res;
	
	len=0;
	
	for (i=0;i<HPEE_MEMORY_MAX_ENT;i++) {
		c = get_8(buf+len);
		
		if (NULL != (res = kmalloc(sizeof(struct resource), GFP_KERNEL))) {
			int result;
			
			res->name = name;
			res->start = mem_parent->start + get_24(buf+len+2);
			res->end = res->start + get_16(buf+len+5)*1024;
			res->flags = IORESOURCE_MEM;
			printk("memory %lx-%lx ", res->start, res->end);
			result = request_resource(mem_parent, res);
			if (result < 0) {
				printk("\n" KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n");
				return result;
			}
		}
		 	
		len+=7;      
	
		if (!(c & HPEE_MEMORY_MORE)) {
			break;
		}
	}
	
	return len;
}


static int configure_irq(const unsigned char *buf)
{
	int len;
	u_int8_t c;
	int i;
	
	len=0;
	
	for (i=0;i<HPEE_IRQ_MAX_ENT;i++) {
		c = get_8(buf+len);
		
		printk("IRQ %d ", c & HPEE_IRQ_CHANNEL_MASK);
		if (c & HPEE_IRQ_TRIG_LEVEL) {
			eisa_make_irq_level(c & HPEE_IRQ_CHANNEL_MASK);
		} else {
			eisa_make_irq_edge(c & HPEE_IRQ_CHANNEL_MASK);
		}
		
		len+=2; 
		/* hpux seems to allow for
		 * two bytes of irq data but only defines one of
		 * them, I think */
		if  (!(c & HPEE_IRQ_MORE)) {
			break;
		}
	}
	
	return len;
}


static int configure_dma(const unsigned char *buf)
{
	int len;
	u_int8_t c;
	int i;
	
	len=0;
	
	for (i=0;i<HPEE_DMA_MAX_ENT;i++) {
		c = get_8(buf+len);
		printk("DMA %d ", c&HPEE_DMA_CHANNEL_MASK);
		/* fixme: maybe initialize the dma channel withthe timing ? */
		len+=2;      
		if (!(c & HPEE_DMA_MORE)) {
			break;
		}
	}
	
	return len;
}

static int configure_port(const unsigned char *buf, struct resource *io_parent,
		     char *board)
{
	int len;
	u_int8_t c;
	int i;
	struct resource *res;
	int result;
	
	len=0;
	
	for (i=0;i<HPEE_PORT_MAX_ENT;i++) {
		c = get_8(buf+len);
		
		if (NULL != (res = kmalloc(sizeof(struct resource), GFP_KERNEL))) {
			res->name = board;
			res->start = get_16(buf+len+1);
			res->end = get_16(buf+len+1)+(c&HPEE_PORT_SIZE_MASK)+1;
			res->flags = IORESOURCE_IO;
			printk("ioports %lx-%lx ", res->start, res->end);
			result = request_resource(io_parent, res);
			if (result < 0) {
				printk("\n" KERN_ERR "EISA Enumerator: failed to claim EISA Bus address space!\n");
				return result;
			}
		}

		len+=3;      
		if (!(c & HPEE_PORT_MORE)) {
			break;
		}
	}
	
	return len;
}


/* byte 1 and 2 is the port number to write
 * and at byte 3 the value to write starts.
 * I assume that there are and- and or- masks
 * here when HPEE_PORT_INIT_MASK is set but I have 
 * not yet encountered this. */
static int configure_port_init(const unsigned char *buf)
{
	int len=0;
	u_int8_t c;
	
	while (len<HPEE_PORT_INIT_MAX_LEN) {
		int s=0;
		c = get_8(buf+len);
		
		switch (c & HPEE_PORT_INIT_WIDTH_MASK)  {
		 case HPEE_PORT_INIT_WIDTH_BYTE:
			s=1;
			if (c & HPEE_PORT_INIT_MASK) {
				printk("\n" KERN_WARNING "port_init: unverified mask attribute\n");
				outb((inb(get_16(buf+len+1) & 
					  get_8(buf+len+3)) | 
				      get_8(buf+len+4)), get_16(buf+len+1));
				      
			} else {
				outb(get_8(buf+len+3), get_16(buf+len+1));
				      
			}
			break;
		 case HPEE_PORT_INIT_WIDTH_WORD:
			s=2;
			if (c & HPEE_PORT_INIT_MASK) {
 				printk(KERN_WARNING "port_init: unverified mask attribute\n");
				       outw((inw(get_16(buf+len+1)) &
					     get_16(buf+len+3)) |
					    get_16(buf+len+5), 
					    get_16(buf+len+1));
			} else {
				outw(cpu_to_le16(get_16(buf+len+3)), get_16(buf+len+1));
			}
			break;
		 case HPEE_PORT_INIT_WIDTH_DWORD:
			s=4;
			if (c & HPEE_PORT_INIT_MASK) {
 				printk("\n" KERN_WARNING "port_init: unverified mask attribute\n");
				outl((inl(get_16(buf+len+1) &
					  get_32(buf+len+3)) |
				      get_32(buf+len+7)), get_16(buf+len+1));
			} else {
				outl(cpu_to_le32(get_32(buf+len+3)), get_16(buf+len+1));
			}

			break;
		 default:
			printk("\n" KERN_ERR "Invalid port init word %02x\n", c);
			return 0;
		}
		
		if (c & HPEE_PORT_INIT_MASK) {   
			s*=2;
		}
		
		len+=s+3;
		if (!(c & HPEE_PORT_INIT_MORE)) {
			break;
		}
	}
	
	return len;
}

static int configure_choise(const unsigned char *buf, u_int8_t *info)
{
	int len;
	
	/* theis record contain the value of the functions
	 * configuration choises and an info byte which 
	 * describes which other records to expect in this 
	 * function */
	len = get_8(buf);
	*info=get_8(buf+len+1);
	 
	return len+2;
}

static int configure_type_string(const unsigned char *buf) 
{
	int len;
	
	/* just skip past the type field */
	len = get_8(buf);
	if (len > 80) {
		printk("\n" KERN_ERR "eisa_enumerator: type info field too long (%d, max is 80)\n", len);
	}
	
	return 1+len;
}

static int configure_function(const unsigned char *buf, int *more) 
{
	/* the init field seems to be a two-byte field
	 * which is non-zero if there are an other function following
	 * I think it is the length of the function def 
	 */
	*more = get_16(buf);
	
	return 2;
}

static int parse_slot_config(int slot,
			     const unsigned char *buf,
			     struct eeprom_eisa_slot_info *es, 
			     struct resource *io_parent,
			     struct resource *mem_parent)
{
	int res=0;
	int function_len;
	unsigned int pos=0;
	unsigned int maxlen;
	int num_func=0;
	u_int8_t flags;
	int p0;
	
	char *board;
	int id_string_used=0;
	
	if (NULL == (board = kmalloc(8, GFP_KERNEL))) {
		return -1;
	}
	print_eisa_id(board, es->eisa_slot_id);
	printk(KERN_INFO "EISA slot %d: %s %s ", 
	       slot, board, es->flags&HPEE_FLAG_BOARD_IS_ISA ? "ISA" : "EISA");
	
	maxlen = es->config_data_length < HPEE_MAX_LENGTH ?
			 es->config_data_length : HPEE_MAX_LENGTH;
	while ((pos < maxlen) && (num_func <= es->num_functions)) {
		pos+=configure_function(buf+pos, &function_len); 
		
		if (!function_len) {
			break;
		}
		num_func++;
		p0 = pos;
		pos += configure_choise(buf+pos, &flags);

		if (flags & HPEE_FUNCTION_INFO_F_DISABLED) {
			/* function disabled, skip silently */
			pos = p0 + function_len;
			continue;
		}
		if (flags & HPEE_FUNCTION_INFO_CFG_FREE_FORM) {
			/* I have no idea how to handle this */
			printk("function %d have free-form confgiuration, skipping ",
				num_func);
			pos = p0 + function_len;
			continue;
		}

		/* the ordering of the sections need
		 * more investigation.
		 * Currently I think that memory comaed before IRQ
		 * I assume the order is LSB to MSB in the 
		 * info flags 
		 * eg type, memory, irq, dma, port, HPEE_PORT_init 
		 */

		if (flags & HPEE_FUNCTION_INFO_HAVE_TYPE) {
			pos += configure_type_string(buf+pos);
		}
		
		if (flags & HPEE_FUNCTION_INFO_HAVE_MEMORY) {
			id_string_used=1;
			pos += configure_memory(buf+pos, mem_parent, board);
		} 
		
		if (flags & HPEE_FUNCTION_INFO_HAVE_IRQ) {
			pos += configure_irq(buf+pos);
		} 
		
		if (flags & HPEE_FUNCTION_INFO_HAVE_DMA) {
			pos += configure_dma(buf+pos);
		} 
		
		if (flags & HPEE_FUNCTION_INFO_HAVE_PORT) {
			id_string_used=1;
			pos += configure_port(buf+pos, io_parent, board);
		} 
		
		if (flags &  HPEE_FUNCTION_INFO_HAVE_PORT_INIT) {
			pos += configure_port_init(buf+pos);
		}
		
		if (p0 + function_len < pos) {
			printk("\n" KERN_ERR "eisa_enumerator: function %d length mis-match "
			       "got %d, expected %d\n",
			       num_func, pos-p0, function_len);
			res=-1;
			break;
		}
		pos = p0 + function_len;
	}
	printk("\n");
	if (!id_string_used) {
		kfree(board);
	}
	
	if (pos != es->config_data_length) {
		printk(KERN_ERR "eisa_enumerator: config data length mis-match got %d, expected %d\n",
			pos, es->config_data_length);
		res=-1;
	}
	
	if (num_func != es->num_functions) {
		printk(KERN_ERR "eisa_enumerator: number of functions mis-match got %d, expected %d\n",
			num_func, es->num_functions);
		res=-2;
	}
	
	return res;
	
}

static int init_slot(int slot, struct eeprom_eisa_slot_info *es)
{
	unsigned int id;
	
	char id_string[8];
	
	if (!(es->slot_info&HPEE_SLOT_INFO_NO_READID)) {
		/* try to read the id of the board in the slot */
		id = le32_to_cpu(inl(SLOT2PORT(slot)+EPI));
		
		if (0xffffffff == id) {
			/* Maybe we didn't expect a card to be here... */
			if (es->eisa_slot_id == 0xffffffff)
				return -1;
			
			/* this board is not here or it does not 
			 * support readid 
			 */
			printk(KERN_ERR "EISA slot %d a configured board was not detected (", 
			       slot);
			
			print_eisa_id(id_string, es->eisa_slot_id);
			printk(" expected %s)\n", id_string);
		
			return -1;	

		}
		if (es->eisa_slot_id != id) {
			print_eisa_id(id_string, id);
			printk(KERN_ERR "EISA slot %d id mis-match: got %s", 
			       slot, id_string);
			
			print_eisa_id(id_string, es->eisa_slot_id);
			printk(" expected %s \n", id_string);
		
			return -1;	
			
		}
	}
	
	/* now: we need to enable the board if 
	 * it supports enabling and run through
	 * the port init sction if present
	 * and finally record any interrupt polarity
	 */
	if (es->slot_features & HPEE_SLOT_FEATURES_ENABLE) {
		/* enable board */
		outb(0x01| inb(SLOT2PORT(slot)+EPI+4),
		     SLOT2PORT(slot)+EPI+4);
	}
	
	return 0;
}


int eisa_enumerator(unsigned long eeprom_addr,
		    struct resource *io_parent, struct resource *mem_parent) 
{
	int i;
	struct eeprom_header *eh;
	static char eeprom_buf[HPEE_MAX_LENGTH];
	
	for (i=0; i < HPEE_MAX_LENGTH; i++) {
		eeprom_buf[i] = gsc_readb(eeprom_addr+i);
	}
	
	printk(KERN_INFO "Enumerating EISA bus\n");
		    	
	eh = (struct eeprom_header*)(eeprom_buf);
	for (i=0;i<eh->num_slots;i++) {
		struct eeprom_eisa_slot_info *es;
		
		es = (struct eeprom_eisa_slot_info*)
			(&eeprom_buf[HPEE_SLOT_INFO(i)]);
	        
		if (-1==init_slot(i+1, es)) {
			continue;
		}
		
		if (es->config_data_offset < HPEE_MAX_LENGTH) {
			if (parse_slot_config(i+1, &eeprom_buf[es->config_data_offset],
					      es, io_parent, mem_parent)) {
				return -1;
			}
		} else {
			printk (KERN_WARNING "EISA EEPROM offset 0x%x out of range\n",es->config_data_offset);
			return -1;
		}
	}
	return eh->num_slots;
}