1 /*
2 * inventory.c
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Copyright (c) 1999 The Puffin Group (David Kennedy and Alex deVries)
10 * Copyright (c) 2001 Matthew Wilcox for Hewlett-Packard
11 *
12 * These are the routines to discover what hardware exists in this box.
13 * This task is complicated by there being 3 different ways of
14 * performing an inventory, depending largely on the age of the box.
15 * The recommended way to do this is to check to see whether the machine
16 * is a `Snake' first, then try System Map, then try PAT. We try System
17 * Map before checking for a Snake -- this probably doesn't cause any
18 * problems, but...
19 */
20
21 #include <linux/types.h>
22 #include <linux/kernel.h>
23 #include <linux/init.h>
24 #include <linux/slab.h>
25 #include <linux/mm.h>
26 #include <asm/hardware.h>
27 #include <asm/io.h>
28 #include <asm/mmzone.h>
29 #include <asm/pdc.h>
30 #include <asm/pdcpat.h>
31 #include <asm/processor.h>
32 #include <asm/page.h>
33 #include <asm/parisc-device.h>
34
35 /*
36 ** Debug options
37 ** DEBUG_PAT Dump details which PDC PAT provides about ranges/devices.
38 */
39 #undef DEBUG_PAT
40
41 int pdc_type __read_mostly = PDC_TYPE_ILLEGAL;
42
setup_pdc(void)43 void __init setup_pdc(void)
44 {
45 long status;
46 unsigned int bus_id;
47 struct pdc_system_map_mod_info module_result;
48 struct pdc_module_path module_path;
49 struct pdc_model model;
50 #ifdef CONFIG_64BIT
51 struct pdc_pat_cell_num cell_info;
52 #endif
53
54 /* Determine the pdc "type" used on this machine */
55
56 printk(KERN_INFO "Determining PDC firmware type: ");
57
58 status = pdc_system_map_find_mods(&module_result, &module_path, 0);
59 if (status == PDC_OK) {
60 pdc_type = PDC_TYPE_SYSTEM_MAP;
61 printk("System Map.\n");
62 return;
63 }
64
65 /*
66 * If the machine doesn't support PDC_SYSTEM_MAP then either it
67 * is a pdc pat box, or it is an older box. All 64 bit capable
68 * machines are either pdc pat boxes or they support PDC_SYSTEM_MAP.
69 */
70
71 /*
72 * TODO: We should test for 64 bit capability and give a
73 * clearer message.
74 */
75
76 #ifdef CONFIG_64BIT
77 status = pdc_pat_cell_get_number(&cell_info);
78 if (status == PDC_OK) {
79 pdc_type = PDC_TYPE_PAT;
80 printk("64 bit PAT.\n");
81 return;
82 }
83 #endif
84
85 /* Check the CPU's bus ID. There's probably a better test. */
86
87 status = pdc_model_info(&model);
88
89 bus_id = (model.hversion >> (4 + 7)) & 0x1f;
90
91 switch (bus_id) {
92 case 0x4: /* 720, 730, 750, 735, 755 */
93 case 0x6: /* 705, 710 */
94 case 0x7: /* 715, 725 */
95 case 0x8: /* 745, 747, 742 */
96 case 0xA: /* 712 and similiar */
97 case 0xC: /* 715/64, at least */
98
99 pdc_type = PDC_TYPE_SNAKE;
100 printk("Snake.\n");
101 return;
102
103 default: /* Everything else */
104
105 printk("Unsupported.\n");
106 panic("If this is a 64-bit machine, please try a 64-bit kernel.\n");
107 }
108 }
109
110 #define PDC_PAGE_ADJ_SHIFT (PAGE_SHIFT - 12) /* pdc pages are always 4k */
111
112 static void __init
set_pmem_entry(physmem_range_t * pmem_ptr,unsigned long start,unsigned long pages4k)113 set_pmem_entry(physmem_range_t *pmem_ptr, unsigned long start,
114 unsigned long pages4k)
115 {
116 /* Rather than aligning and potentially throwing away
117 * memory, we'll assume that any ranges are already
118 * nicely aligned with any reasonable page size, and
119 * panic if they are not (it's more likely that the
120 * pdc info is bad in this case).
121 */
122
123 if (unlikely( ((start & (PAGE_SIZE - 1)) != 0)
124 || ((pages4k & ((1UL << PDC_PAGE_ADJ_SHIFT) - 1)) != 0) )) {
125
126 panic("Memory range doesn't align with page size!\n");
127 }
128
129 pmem_ptr->start_pfn = (start >> PAGE_SHIFT);
130 pmem_ptr->pages = (pages4k >> PDC_PAGE_ADJ_SHIFT);
131 }
132
pagezero_memconfig(void)133 static void __init pagezero_memconfig(void)
134 {
135 unsigned long npages;
136
137 /* Use the 32 bit information from page zero to create a single
138 * entry in the pmem_ranges[] table.
139 *
140 * We currently don't support machines with contiguous memory
141 * >= 4 Gb, who report that memory using 64 bit only fields
142 * on page zero. It's not worth doing until it can be tested,
143 * and it is not clear we can support those machines for other
144 * reasons.
145 *
146 * If that support is done in the future, this is where it
147 * should be done.
148 */
149
150 npages = (PAGE_ALIGN(PAGE0->imm_max_mem) >> PAGE_SHIFT);
151 set_pmem_entry(pmem_ranges,0UL,npages);
152 npmem_ranges = 1;
153 }
154
155 #ifdef CONFIG_64BIT
156
157 /* All of the PDC PAT specific code is 64-bit only */
158
159 /*
160 ** The module object is filled via PDC_PAT_CELL[Return Cell Module].
161 ** If a module is found, register module will get the IODC bytes via
162 ** pdc_iodc_read() using the PA view of conf_base_addr for the hpa parameter.
163 **
164 ** The IO view can be used by PDC_PAT_CELL[Return Cell Module]
165 ** only for SBAs and LBAs. This view will cause an invalid
166 ** argument error for all other cell module types.
167 **
168 */
169
170 static int __init
pat_query_module(ulong pcell_loc,ulong mod_index)171 pat_query_module(ulong pcell_loc, ulong mod_index)
172 {
173 pdc_pat_cell_mod_maddr_block_t pa_pdc_cell;
174 unsigned long bytecnt;
175 unsigned long temp; /* 64-bit scratch value */
176 long status; /* PDC return value status */
177 struct parisc_device *dev;
178
179 /* return cell module (PA or Processor view) */
180 status = pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index,
181 PA_VIEW, &pa_pdc_cell);
182
183 if (status != PDC_OK) {
184 /* no more cell modules or error */
185 return status;
186 }
187
188 temp = pa_pdc_cell.cba;
189 dev = alloc_pa_dev(PAT_GET_CBA(temp), &pa_pdc_cell.mod_path);
190 if (!dev) {
191 return PDC_OK;
192 }
193
194 /* alloc_pa_dev sets dev->hpa */
195
196 /*
197 ** save parameters in the parisc_device
198 ** (The idea being the device driver will call pdc_pat_cell_module()
199 ** and store the results in its own data structure.)
200 */
201 dev->pcell_loc = pcell_loc;
202 dev->mod_index = mod_index;
203
204 /* save generic info returned from the call */
205 /* REVISIT: who is the consumer of this? not sure yet... */
206 dev->mod_info = pa_pdc_cell.mod_info; /* pass to PAT_GET_ENTITY() */
207 dev->pmod_loc = pa_pdc_cell.mod_location;
208
209 register_parisc_device(dev); /* advertise device */
210
211 #ifdef DEBUG_PAT
212 pdc_pat_cell_mod_maddr_block_t io_pdc_cell;
213 /* dump what we see so far... */
214 switch (PAT_GET_ENTITY(dev->mod_info)) {
215 unsigned long i;
216
217 case PAT_ENTITY_PROC:
218 printk(KERN_DEBUG "PAT_ENTITY_PROC: id_eid 0x%lx\n",
219 pa_pdc_cell.mod[0]);
220 break;
221
222 case PAT_ENTITY_MEM:
223 printk(KERN_DEBUG
224 "PAT_ENTITY_MEM: amount 0x%lx min_gni_base 0x%lx min_gni_len 0x%lx\n",
225 pa_pdc_cell.mod[0], pa_pdc_cell.mod[1],
226 pa_pdc_cell.mod[2]);
227 break;
228 case PAT_ENTITY_CA:
229 printk(KERN_DEBUG "PAT_ENTITY_CA: %ld\n", pcell_loc);
230 break;
231
232 case PAT_ENTITY_PBC:
233 printk(KERN_DEBUG "PAT_ENTITY_PBC: ");
234 goto print_ranges;
235
236 case PAT_ENTITY_SBA:
237 printk(KERN_DEBUG "PAT_ENTITY_SBA: ");
238 goto print_ranges;
239
240 case PAT_ENTITY_LBA:
241 printk(KERN_DEBUG "PAT_ENTITY_LBA: ");
242
243 print_ranges:
244 pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index,
245 IO_VIEW, &io_pdc_cell);
246 printk(KERN_DEBUG "ranges %ld\n", pa_pdc_cell.mod[1]);
247 for (i = 0; i < pa_pdc_cell.mod[1]; i++) {
248 printk(KERN_DEBUG
249 " PA_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n",
250 i, pa_pdc_cell.mod[2 + i * 3], /* type */
251 pa_pdc_cell.mod[3 + i * 3], /* start */
252 pa_pdc_cell.mod[4 + i * 3]); /* finish (ie end) */
253 printk(KERN_DEBUG
254 " IO_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n",
255 i, io_pdc_cell.mod[2 + i * 3], /* type */
256 io_pdc_cell.mod[3 + i * 3], /* start */
257 io_pdc_cell.mod[4 + i * 3]); /* finish (ie end) */
258 }
259 printk(KERN_DEBUG "\n");
260 break;
261 }
262 #endif /* DEBUG_PAT */
263 return PDC_OK;
264 }
265
266
267 /* pat pdc can return information about a variety of different
268 * types of memory (e.g. firmware,i/o, etc) but we only care about
269 * the usable physical ram right now. Since the firmware specific
270 * information is allocated on the stack, we'll be generous, in
271 * case there is a lot of other information we don't care about.
272 */
273
274 #define PAT_MAX_RANGES (4 * MAX_PHYSMEM_RANGES)
275
pat_memconfig(void)276 static void __init pat_memconfig(void)
277 {
278 unsigned long actual_len;
279 struct pdc_pat_pd_addr_map_entry mem_table[PAT_MAX_RANGES+1];
280 struct pdc_pat_pd_addr_map_entry *mtbl_ptr;
281 physmem_range_t *pmem_ptr;
282 long status;
283 int entries;
284 unsigned long length;
285 int i;
286
287 length = (PAT_MAX_RANGES + 1) * sizeof(struct pdc_pat_pd_addr_map_entry);
288
289 status = pdc_pat_pd_get_addr_map(&actual_len, mem_table, length, 0L);
290
291 if ((status != PDC_OK)
292 || ((actual_len % sizeof(struct pdc_pat_pd_addr_map_entry)) != 0)) {
293
294 /* The above pdc call shouldn't fail, but, just in
295 * case, just use the PAGE0 info.
296 */
297
298 printk("\n\n\n");
299 printk(KERN_WARNING "WARNING! Could not get full memory configuration. "
300 "All memory may not be used!\n\n\n");
301 pagezero_memconfig();
302 return;
303 }
304
305 entries = actual_len / sizeof(struct pdc_pat_pd_addr_map_entry);
306
307 if (entries > PAT_MAX_RANGES) {
308 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
309 printk(KERN_WARNING "Some memory may not be used!\n");
310 }
311
312 /* Copy information into the firmware independent pmem_ranges
313 * array, skipping types we don't care about. Notice we said
314 * "may" above. We'll use all the entries that were returned.
315 */
316
317 npmem_ranges = 0;
318 mtbl_ptr = mem_table;
319 pmem_ptr = pmem_ranges; /* Global firmware independent table */
320 for (i = 0; i < entries; i++,mtbl_ptr++) {
321 if ( (mtbl_ptr->entry_type != PAT_MEMORY_DESCRIPTOR)
322 || (mtbl_ptr->memory_type != PAT_MEMTYPE_MEMORY)
323 || (mtbl_ptr->pages == 0)
324 || ( (mtbl_ptr->memory_usage != PAT_MEMUSE_GENERAL)
325 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GI)
326 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GNI) ) ) {
327
328 continue;
329 }
330
331 if (npmem_ranges == MAX_PHYSMEM_RANGES) {
332 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
333 printk(KERN_WARNING "Some memory will not be used!\n");
334 break;
335 }
336
337 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages);
338 npmem_ranges++;
339 }
340 }
341
pat_inventory(void)342 static int __init pat_inventory(void)
343 {
344 int status;
345 ulong mod_index = 0;
346 struct pdc_pat_cell_num cell_info;
347
348 /*
349 ** Note: Prelude (and it's successors: Lclass, A400/500) only
350 ** implement PDC_PAT_CELL sub-options 0 and 2.
351 */
352 status = pdc_pat_cell_get_number(&cell_info);
353 if (status != PDC_OK) {
354 return 0;
355 }
356
357 #ifdef DEBUG_PAT
358 printk(KERN_DEBUG "CELL_GET_NUMBER: 0x%lx 0x%lx\n", cell_info.cell_num,
359 cell_info.cell_loc);
360 #endif
361
362 while (PDC_OK == pat_query_module(cell_info.cell_loc, mod_index)) {
363 mod_index++;
364 }
365
366 return mod_index;
367 }
368
369 /* We only look for extended memory ranges on a 64 bit capable box */
sprockets_memconfig(void)370 static void __init sprockets_memconfig(void)
371 {
372 struct pdc_memory_table_raddr r_addr;
373 struct pdc_memory_table mem_table[MAX_PHYSMEM_RANGES];
374 struct pdc_memory_table *mtbl_ptr;
375 physmem_range_t *pmem_ptr;
376 long status;
377 int entries;
378 int i;
379
380 status = pdc_mem_mem_table(&r_addr,mem_table,
381 (unsigned long)MAX_PHYSMEM_RANGES);
382
383 if (status != PDC_OK) {
384
385 /* The above pdc call only works on boxes with sprockets
386 * firmware (newer B,C,J class). Other non PAT PDC machines
387 * do support more than 3.75 Gb of memory, but we don't
388 * support them yet.
389 */
390
391 pagezero_memconfig();
392 return;
393 }
394
395 if (r_addr.entries_total > MAX_PHYSMEM_RANGES) {
396 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
397 printk(KERN_WARNING "Some memory will not be used!\n");
398 }
399
400 entries = (int)r_addr.entries_returned;
401
402 npmem_ranges = 0;
403 mtbl_ptr = mem_table;
404 pmem_ptr = pmem_ranges; /* Global firmware independent table */
405 for (i = 0; i < entries; i++,mtbl_ptr++) {
406 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages);
407 npmem_ranges++;
408 }
409 }
410
411 #else /* !CONFIG_64BIT */
412
413 #define pat_inventory() do { } while (0)
414 #define pat_memconfig() do { } while (0)
415 #define sprockets_memconfig() pagezero_memconfig()
416
417 #endif /* !CONFIG_64BIT */
418
419
420 #ifndef CONFIG_PA20
421
422 /* Code to support Snake machines (7[2350], 7[235]5, 715/Scorpio) */
423
424 static struct parisc_device * __init
legacy_create_device(struct pdc_memory_map * r_addr,struct pdc_module_path * module_path)425 legacy_create_device(struct pdc_memory_map *r_addr,
426 struct pdc_module_path *module_path)
427 {
428 struct parisc_device *dev;
429 int status = pdc_mem_map_hpa(r_addr, module_path);
430 if (status != PDC_OK)
431 return NULL;
432
433 dev = alloc_pa_dev(r_addr->hpa, &module_path->path);
434 if (dev == NULL)
435 return NULL;
436
437 register_parisc_device(dev);
438 return dev;
439 }
440
441 /**
442 * snake_inventory
443 *
444 * Before PDC_SYSTEM_MAP was invented, the PDC_MEM_MAP call was used.
445 * To use it, we initialise the mod_path.bc to 0xff and try all values of
446 * mod to get the HPA for the top-level devices. Bus adapters may have
447 * sub-devices which are discovered by setting bc[5] to 0 and bc[4] to the
448 * module, then trying all possible functions.
449 */
snake_inventory(void)450 static void __init snake_inventory(void)
451 {
452 int mod;
453 for (mod = 0; mod < 16; mod++) {
454 struct parisc_device *dev;
455 struct pdc_module_path module_path;
456 struct pdc_memory_map r_addr;
457 unsigned int func;
458
459 memset(module_path.path.bc, 0xff, 6);
460 module_path.path.mod = mod;
461 dev = legacy_create_device(&r_addr, &module_path);
462 if ((!dev) || (dev->id.hw_type != HPHW_BA))
463 continue;
464
465 memset(module_path.path.bc, 0xff, 4);
466 module_path.path.bc[4] = mod;
467
468 for (func = 0; func < 16; func++) {
469 module_path.path.bc[5] = 0;
470 module_path.path.mod = func;
471 legacy_create_device(&r_addr, &module_path);
472 }
473 }
474 }
475
476 #else /* CONFIG_PA20 */
477 #define snake_inventory() do { } while (0)
478 #endif /* CONFIG_PA20 */
479
480 /* Common 32/64 bit based code goes here */
481
482 /**
483 * add_system_map_addresses - Add additional addresses to the parisc device.
484 * @dev: The parisc device.
485 * @num_addrs: Then number of addresses to add;
486 * @module_instance: The system_map module instance.
487 *
488 * This function adds any additional addresses reported by the system_map
489 * firmware to the parisc device.
490 */
491 static void __init
add_system_map_addresses(struct parisc_device * dev,int num_addrs,int module_instance)492 add_system_map_addresses(struct parisc_device *dev, int num_addrs,
493 int module_instance)
494 {
495 int i;
496 long status;
497 struct pdc_system_map_addr_info addr_result;
498
499 dev->addr = kmalloc(num_addrs * sizeof(unsigned long), GFP_KERNEL);
500 if(!dev->addr) {
501 printk(KERN_ERR "%s %s(): memory allocation failure\n",
502 __FILE__, __func__);
503 return;
504 }
505
506 for(i = 1; i <= num_addrs; ++i) {
507 status = pdc_system_map_find_addrs(&addr_result,
508 module_instance, i);
509 if(PDC_OK == status) {
510 dev->addr[dev->num_addrs] = (unsigned long)addr_result.mod_addr;
511 dev->num_addrs++;
512 } else {
513 printk(KERN_WARNING
514 "Bad PDC_FIND_ADDRESS status return (%ld) for index %d\n",
515 status, i);
516 }
517 }
518 }
519
520 /**
521 * system_map_inventory - Retrieve firmware devices via SYSTEM_MAP.
522 *
523 * This function attempts to retrieve and register all the devices firmware
524 * knows about via the SYSTEM_MAP PDC call.
525 */
system_map_inventory(void)526 static void __init system_map_inventory(void)
527 {
528 int i;
529 long status = PDC_OK;
530
531 for (i = 0; i < 256; i++) {
532 struct parisc_device *dev;
533 struct pdc_system_map_mod_info module_result;
534 struct pdc_module_path module_path;
535
536 status = pdc_system_map_find_mods(&module_result,
537 &module_path, i);
538 if ((status == PDC_BAD_PROC) || (status == PDC_NE_MOD))
539 break;
540 if (status != PDC_OK)
541 continue;
542
543 dev = alloc_pa_dev(module_result.mod_addr, &module_path.path);
544 if (!dev)
545 continue;
546
547 register_parisc_device(dev);
548
549 /* if available, get the additional addresses for a module */
550 if (!module_result.add_addrs)
551 continue;
552
553 add_system_map_addresses(dev, module_result.add_addrs, i);
554 }
555
556 walk_central_bus();
557 return;
558 }
559
do_memory_inventory(void)560 void __init do_memory_inventory(void)
561 {
562 switch (pdc_type) {
563
564 case PDC_TYPE_PAT:
565 pat_memconfig();
566 break;
567
568 case PDC_TYPE_SYSTEM_MAP:
569 sprockets_memconfig();
570 break;
571
572 case PDC_TYPE_SNAKE:
573 pagezero_memconfig();
574 return;
575
576 default:
577 panic("Unknown PDC type!\n");
578 }
579
580 if (npmem_ranges == 0 || pmem_ranges[0].start_pfn != 0) {
581 printk(KERN_WARNING "Bad memory configuration returned!\n");
582 printk(KERN_WARNING "Some memory may not be used!\n");
583 pagezero_memconfig();
584 }
585 }
586
do_device_inventory(void)587 void __init do_device_inventory(void)
588 {
589 printk(KERN_INFO "Searching for devices...\n");
590
591 init_parisc_bus();
592
593 switch (pdc_type) {
594
595 case PDC_TYPE_PAT:
596 pat_inventory();
597 break;
598
599 case PDC_TYPE_SYSTEM_MAP:
600 system_map_inventory();
601 break;
602
603 case PDC_TYPE_SNAKE:
604 snake_inventory();
605 break;
606
607 default:
608 panic("Unknown PDC type!\n");
609 }
610 printk(KERN_INFO "Found devices:\n");
611 print_parisc_devices();
612 }
613