1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * inventory.c
4 *
5 * Copyright (c) 1999 The Puffin Group (David Kennedy and Alex deVries)
6 * Copyright (c) 2001 Matthew Wilcox for Hewlett-Packard
7 *
8 * These are the routines to discover what hardware exists in this box.
9 * This task is complicated by there being 3 different ways of
10 * performing an inventory, depending largely on the age of the box.
11 * The recommended way to do this is to check to see whether the machine
12 * is a `Snake' first, then try System Map, then try PAT. We try System
13 * Map before checking for a Snake -- this probably doesn't cause any
14 * problems, but...
15 */
16
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/init.h>
20 #include <linux/slab.h>
21 #include <linux/mm.h>
22 #include <asm/hardware.h>
23 #include <asm/io.h>
24 #include <asm/mmzone.h>
25 #include <asm/pdc.h>
26 #include <asm/pdcpat.h>
27 #include <asm/processor.h>
28 #include <asm/page.h>
29 #include <asm/parisc-device.h>
30 #include <asm/tlbflush.h>
31
32 /*
33 ** Debug options
34 ** DEBUG_PAT Dump details which PDC PAT provides about ranges/devices.
35 */
36 #undef DEBUG_PAT
37
38 int pdc_type __ro_after_init = PDC_TYPE_ILLEGAL;
39
40 /* cell number and location (PAT firmware only) */
41 unsigned long parisc_cell_num __ro_after_init;
42 unsigned long parisc_cell_loc __ro_after_init;
43 unsigned long parisc_pat_pdc_cap __ro_after_init;
44
45
setup_pdc(void)46 void __init setup_pdc(void)
47 {
48 long status;
49 unsigned int bus_id;
50 struct pdc_system_map_mod_info module_result;
51 struct pdc_module_path module_path;
52 struct pdc_model model;
53 #ifdef CONFIG_64BIT
54 struct pdc_pat_cell_num cell_info;
55 #endif
56
57 /* Determine the pdc "type" used on this machine */
58
59 printk(KERN_INFO "Determining PDC firmware type: ");
60
61 status = pdc_system_map_find_mods(&module_result, &module_path, 0);
62 if (status == PDC_OK) {
63 pdc_type = PDC_TYPE_SYSTEM_MAP;
64 pr_cont("System Map.\n");
65 return;
66 }
67
68 /*
69 * If the machine doesn't support PDC_SYSTEM_MAP then either it
70 * is a pdc pat box, or it is an older box. All 64 bit capable
71 * machines are either pdc pat boxes or they support PDC_SYSTEM_MAP.
72 */
73
74 /*
75 * TODO: We should test for 64 bit capability and give a
76 * clearer message.
77 */
78
79 #ifdef CONFIG_64BIT
80 status = pdc_pat_cell_get_number(&cell_info);
81 if (status == PDC_OK) {
82 unsigned long legacy_rev, pat_rev;
83 pdc_type = PDC_TYPE_PAT;
84 pr_cont("64 bit PAT.\n");
85 parisc_cell_num = cell_info.cell_num;
86 parisc_cell_loc = cell_info.cell_loc;
87 pr_info("PAT: Running on cell %lu and location %lu.\n",
88 parisc_cell_num, parisc_cell_loc);
89 status = pdc_pat_pd_get_pdc_revisions(&legacy_rev,
90 &pat_rev, &parisc_pat_pdc_cap);
91 pr_info("PAT: legacy revision 0x%lx, pat_rev 0x%lx, pdc_cap 0x%lx, S-PTLB %d, HPMC_RENDEZ %d.\n",
92 legacy_rev, pat_rev, parisc_pat_pdc_cap,
93 parisc_pat_pdc_cap
94 & PDC_PAT_CAPABILITY_BIT_SIMULTANEOUS_PTLB ? 1:0,
95 parisc_pat_pdc_cap
96 & PDC_PAT_CAPABILITY_BIT_PDC_HPMC_RENDEZ ? 1:0);
97 return;
98 }
99 #endif
100
101 /* Check the CPU's bus ID. There's probably a better test. */
102
103 status = pdc_model_info(&model);
104
105 bus_id = (model.hversion >> (4 + 7)) & 0x1f;
106
107 switch (bus_id) {
108 case 0x4: /* 720, 730, 750, 735, 755 */
109 case 0x6: /* 705, 710 */
110 case 0x7: /* 715, 725 */
111 case 0x8: /* 745, 747, 742 */
112 case 0xA: /* 712 and similar */
113 case 0xC: /* 715/64, at least */
114
115 pdc_type = PDC_TYPE_SNAKE;
116 pr_cont("Snake.\n");
117 return;
118
119 default: /* Everything else */
120
121 pr_cont("Unsupported.\n");
122 panic("If this is a 64-bit machine, please try a 64-bit kernel.\n");
123 }
124 }
125
126 #define PDC_PAGE_ADJ_SHIFT (PAGE_SHIFT - 12) /* pdc pages are always 4k */
127
128 static void __init
set_pmem_entry(physmem_range_t * pmem_ptr,unsigned long start,unsigned long pages4k)129 set_pmem_entry(physmem_range_t *pmem_ptr, unsigned long start,
130 unsigned long pages4k)
131 {
132 /* Rather than aligning and potentially throwing away
133 * memory, we'll assume that any ranges are already
134 * nicely aligned with any reasonable page size, and
135 * panic if they are not (it's more likely that the
136 * pdc info is bad in this case).
137 */
138
139 if (unlikely( ((start & (PAGE_SIZE - 1)) != 0)
140 || ((pages4k & ((1UL << PDC_PAGE_ADJ_SHIFT) - 1)) != 0) )) {
141
142 panic("Memory range doesn't align with page size!\n");
143 }
144
145 pmem_ptr->start_pfn = (start >> PAGE_SHIFT);
146 pmem_ptr->pages = (pages4k >> PDC_PAGE_ADJ_SHIFT);
147 }
148
pagezero_memconfig(void)149 static void __init pagezero_memconfig(void)
150 {
151 unsigned long npages;
152
153 /* Use the 32 bit information from page zero to create a single
154 * entry in the pmem_ranges[] table.
155 *
156 * We currently don't support machines with contiguous memory
157 * >= 4 Gb, who report that memory using 64 bit only fields
158 * on page zero. It's not worth doing until it can be tested,
159 * and it is not clear we can support those machines for other
160 * reasons.
161 *
162 * If that support is done in the future, this is where it
163 * should be done.
164 */
165
166 npages = (PAGE_ALIGN(PAGE0->imm_max_mem) >> PAGE_SHIFT);
167 set_pmem_entry(pmem_ranges,0UL,npages);
168 npmem_ranges = 1;
169 }
170
171 #ifdef CONFIG_64BIT
172
173 /* All of the PDC PAT specific code is 64-bit only */
174
175 /*
176 ** The module object is filled via PDC_PAT_CELL[Return Cell Module].
177 ** If a module is found, register module will get the IODC bytes via
178 ** pdc_iodc_read() using the PA view of conf_base_addr for the hpa parameter.
179 **
180 ** The IO view can be used by PDC_PAT_CELL[Return Cell Module]
181 ** only for SBAs and LBAs. This view will cause an invalid
182 ** argument error for all other cell module types.
183 **
184 */
185
186 static int __init
pat_query_module(ulong pcell_loc,ulong mod_index)187 pat_query_module(ulong pcell_loc, ulong mod_index)
188 {
189 pdc_pat_cell_mod_maddr_block_t *pa_pdc_cell;
190 unsigned long bytecnt;
191 unsigned long temp; /* 64-bit scratch value */
192 long status; /* PDC return value status */
193 struct parisc_device *dev;
194
195 pa_pdc_cell = kmalloc(sizeof (*pa_pdc_cell), GFP_KERNEL);
196 if (!pa_pdc_cell)
197 panic("couldn't allocate memory for PDC_PAT_CELL!");
198
199 /* return cell module (PA or Processor view) */
200 status = pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index,
201 PA_VIEW, pa_pdc_cell);
202
203 if (status != PDC_OK) {
204 /* no more cell modules or error */
205 kfree(pa_pdc_cell);
206 return status;
207 }
208
209 temp = pa_pdc_cell->cba;
210 dev = alloc_pa_dev(PAT_GET_CBA(temp), &(pa_pdc_cell->mod_path));
211 if (!dev) {
212 kfree(pa_pdc_cell);
213 return PDC_OK;
214 }
215
216 /* alloc_pa_dev sets dev->hpa */
217
218 /*
219 ** save parameters in the parisc_device
220 ** (The idea being the device driver will call pdc_pat_cell_module()
221 ** and store the results in its own data structure.)
222 */
223 dev->pcell_loc = pcell_loc;
224 dev->mod_index = mod_index;
225
226 /* save generic info returned from the call */
227 /* REVISIT: who is the consumer of this? not sure yet... */
228 dev->mod_info = pa_pdc_cell->mod_info; /* pass to PAT_GET_ENTITY() */
229 dev->pmod_loc = pa_pdc_cell->mod_location;
230 dev->mod0 = pa_pdc_cell->mod[0];
231
232 register_parisc_device(dev); /* advertise device */
233
234 #ifdef DEBUG_PAT
235 /* dump what we see so far... */
236 switch (PAT_GET_ENTITY(dev->mod_info)) {
237 pdc_pat_cell_mod_maddr_block_t io_pdc_cell;
238 unsigned long i;
239
240 case PAT_ENTITY_PROC:
241 printk(KERN_DEBUG "PAT_ENTITY_PROC: id_eid 0x%lx\n",
242 pa_pdc_cell->mod[0]);
243 break;
244
245 case PAT_ENTITY_MEM:
246 printk(KERN_DEBUG
247 "PAT_ENTITY_MEM: amount 0x%lx min_gni_base 0x%lx min_gni_len 0x%lx\n",
248 pa_pdc_cell->mod[0], pa_pdc_cell->mod[1],
249 pa_pdc_cell->mod[2]);
250 break;
251 case PAT_ENTITY_CA:
252 printk(KERN_DEBUG "PAT_ENTITY_CA: %ld\n", pcell_loc);
253 break;
254
255 case PAT_ENTITY_PBC:
256 printk(KERN_DEBUG "PAT_ENTITY_PBC: ");
257 goto print_ranges;
258
259 case PAT_ENTITY_SBA:
260 printk(KERN_DEBUG "PAT_ENTITY_SBA: ");
261 goto print_ranges;
262
263 case PAT_ENTITY_LBA:
264 printk(KERN_DEBUG "PAT_ENTITY_LBA: ");
265
266 print_ranges:
267 pdc_pat_cell_module(&bytecnt, pcell_loc, mod_index,
268 IO_VIEW, &io_pdc_cell);
269 printk(KERN_DEBUG "ranges %ld\n", pa_pdc_cell->mod[1]);
270 for (i = 0; i < pa_pdc_cell->mod[1]; i++) {
271 printk(KERN_DEBUG
272 " PA_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n",
273 i, pa_pdc_cell->mod[2 + i * 3], /* type */
274 pa_pdc_cell->mod[3 + i * 3], /* start */
275 pa_pdc_cell->mod[4 + i * 3]); /* finish (ie end) */
276 printk(KERN_DEBUG
277 " IO_VIEW %ld: 0x%016lx 0x%016lx 0x%016lx\n",
278 i, io_pdc_cell.mod[2 + i * 3], /* type */
279 io_pdc_cell.mod[3 + i * 3], /* start */
280 io_pdc_cell.mod[4 + i * 3]); /* finish (ie end) */
281 }
282 printk(KERN_DEBUG "\n");
283 break;
284 }
285 #endif /* DEBUG_PAT */
286
287 kfree(pa_pdc_cell);
288
289 return PDC_OK;
290 }
291
292
293 /* pat pdc can return information about a variety of different
294 * types of memory (e.g. firmware,i/o, etc) but we only care about
295 * the usable physical ram right now. Since the firmware specific
296 * information is allocated on the stack, we'll be generous, in
297 * case there is a lot of other information we don't care about.
298 */
299
300 #define PAT_MAX_RANGES (4 * MAX_PHYSMEM_RANGES)
301
pat_memconfig(void)302 static void __init pat_memconfig(void)
303 {
304 unsigned long actual_len;
305 struct pdc_pat_pd_addr_map_entry mem_table[PAT_MAX_RANGES+1];
306 struct pdc_pat_pd_addr_map_entry *mtbl_ptr;
307 physmem_range_t *pmem_ptr;
308 long status;
309 int entries;
310 unsigned long length;
311 int i;
312
313 length = (PAT_MAX_RANGES + 1) * sizeof(struct pdc_pat_pd_addr_map_entry);
314
315 status = pdc_pat_pd_get_addr_map(&actual_len, mem_table, length, 0L);
316
317 if ((status != PDC_OK)
318 || ((actual_len % sizeof(struct pdc_pat_pd_addr_map_entry)) != 0)) {
319
320 /* The above pdc call shouldn't fail, but, just in
321 * case, just use the PAGE0 info.
322 */
323
324 printk("\n\n\n");
325 printk(KERN_WARNING "WARNING! Could not get full memory configuration. "
326 "All memory may not be used!\n\n\n");
327 pagezero_memconfig();
328 return;
329 }
330
331 entries = actual_len / sizeof(struct pdc_pat_pd_addr_map_entry);
332
333 if (entries > PAT_MAX_RANGES) {
334 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
335 printk(KERN_WARNING "Some memory may not be used!\n");
336 }
337
338 /* Copy information into the firmware independent pmem_ranges
339 * array, skipping types we don't care about. Notice we said
340 * "may" above. We'll use all the entries that were returned.
341 */
342
343 npmem_ranges = 0;
344 mtbl_ptr = mem_table;
345 pmem_ptr = pmem_ranges; /* Global firmware independent table */
346 for (i = 0; i < entries; i++,mtbl_ptr++) {
347 if ( (mtbl_ptr->entry_type != PAT_MEMORY_DESCRIPTOR)
348 || (mtbl_ptr->memory_type != PAT_MEMTYPE_MEMORY)
349 || (mtbl_ptr->pages == 0)
350 || ( (mtbl_ptr->memory_usage != PAT_MEMUSE_GENERAL)
351 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GI)
352 && (mtbl_ptr->memory_usage != PAT_MEMUSE_GNI) ) ) {
353
354 continue;
355 }
356
357 if (npmem_ranges == MAX_PHYSMEM_RANGES) {
358 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
359 printk(KERN_WARNING "Some memory will not be used!\n");
360 break;
361 }
362
363 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages);
364 npmem_ranges++;
365 }
366 }
367
pat_inventory(void)368 static int __init pat_inventory(void)
369 {
370 int status;
371 ulong mod_index = 0;
372 struct pdc_pat_cell_num cell_info;
373
374 /*
375 ** Note: Prelude (and it's successors: Lclass, A400/500) only
376 ** implement PDC_PAT_CELL sub-options 0 and 2.
377 */
378 status = pdc_pat_cell_get_number(&cell_info);
379 if (status != PDC_OK) {
380 return 0;
381 }
382
383 #ifdef DEBUG_PAT
384 printk(KERN_DEBUG "CELL_GET_NUMBER: 0x%lx 0x%lx\n", cell_info.cell_num,
385 cell_info.cell_loc);
386 #endif
387
388 while (PDC_OK == pat_query_module(cell_info.cell_loc, mod_index)) {
389 mod_index++;
390 }
391
392 return mod_index;
393 }
394
395 /* We only look for extended memory ranges on a 64 bit capable box */
sprockets_memconfig(void)396 static void __init sprockets_memconfig(void)
397 {
398 struct pdc_memory_table_raddr r_addr;
399 struct pdc_memory_table mem_table[MAX_PHYSMEM_RANGES];
400 struct pdc_memory_table *mtbl_ptr;
401 physmem_range_t *pmem_ptr;
402 long status;
403 int entries;
404 int i;
405
406 status = pdc_mem_mem_table(&r_addr,mem_table,
407 (unsigned long)MAX_PHYSMEM_RANGES);
408
409 if (status != PDC_OK) {
410
411 /* The above pdc call only works on boxes with sprockets
412 * firmware (newer B,C,J class). Other non PAT PDC machines
413 * do support more than 3.75 Gb of memory, but we don't
414 * support them yet.
415 */
416
417 pagezero_memconfig();
418 return;
419 }
420
421 if (r_addr.entries_total > MAX_PHYSMEM_RANGES) {
422 printk(KERN_WARNING "This Machine has more memory ranges than we support!\n");
423 printk(KERN_WARNING "Some memory will not be used!\n");
424 }
425
426 entries = (int)r_addr.entries_returned;
427
428 npmem_ranges = 0;
429 mtbl_ptr = mem_table;
430 pmem_ptr = pmem_ranges; /* Global firmware independent table */
431 for (i = 0; i < entries; i++,mtbl_ptr++) {
432 set_pmem_entry(pmem_ptr++,mtbl_ptr->paddr,mtbl_ptr->pages);
433 npmem_ranges++;
434 }
435 }
436
437 #else /* !CONFIG_64BIT */
438
439 #define pat_inventory() do { } while (0)
440 #define pat_memconfig() do { } while (0)
441 #define sprockets_memconfig() pagezero_memconfig()
442
443 #endif /* !CONFIG_64BIT */
444
445
446 #ifndef CONFIG_PA20
447
448 /* Code to support Snake machines (7[2350], 7[235]5, 715/Scorpio) */
449
450 static struct parisc_device * __init
legacy_create_device(struct pdc_memory_map * r_addr,struct pdc_module_path * module_path)451 legacy_create_device(struct pdc_memory_map *r_addr,
452 struct pdc_module_path *module_path)
453 {
454 struct parisc_device *dev;
455 int status = pdc_mem_map_hpa(r_addr, module_path);
456 if (status != PDC_OK)
457 return NULL;
458
459 dev = alloc_pa_dev(r_addr->hpa, &module_path->path);
460 if (dev == NULL)
461 return NULL;
462
463 register_parisc_device(dev);
464 return dev;
465 }
466
467 /**
468 * snake_inventory
469 *
470 * Before PDC_SYSTEM_MAP was invented, the PDC_MEM_MAP call was used.
471 * To use it, we initialise the mod_path.bc to 0xff and try all values of
472 * mod to get the HPA for the top-level devices. Bus adapters may have
473 * sub-devices which are discovered by setting bc[5] to 0 and bc[4] to the
474 * module, then trying all possible functions.
475 */
snake_inventory(void)476 static void __init snake_inventory(void)
477 {
478 int mod;
479 for (mod = 0; mod < 16; mod++) {
480 struct parisc_device *dev;
481 struct pdc_module_path module_path;
482 struct pdc_memory_map r_addr;
483 unsigned int func;
484
485 memset(module_path.path.bc, 0xff, 6);
486 module_path.path.mod = mod;
487 dev = legacy_create_device(&r_addr, &module_path);
488 if ((!dev) || (dev->id.hw_type != HPHW_BA))
489 continue;
490
491 memset(module_path.path.bc, 0xff, 4);
492 module_path.path.bc[4] = mod;
493
494 for (func = 0; func < 16; func++) {
495 module_path.path.bc[5] = 0;
496 module_path.path.mod = func;
497 legacy_create_device(&r_addr, &module_path);
498 }
499 }
500 }
501
502 #else /* CONFIG_PA20 */
503 #define snake_inventory() do { } while (0)
504 #endif /* CONFIG_PA20 */
505
506 /* Common 32/64 bit based code goes here */
507
508 /**
509 * add_system_map_addresses - Add additional addresses to the parisc device.
510 * @dev: The parisc device.
511 * @num_addrs: Then number of addresses to add;
512 * @module_instance: The system_map module instance.
513 *
514 * This function adds any additional addresses reported by the system_map
515 * firmware to the parisc device.
516 */
517 static void __init
add_system_map_addresses(struct parisc_device * dev,int num_addrs,int module_instance)518 add_system_map_addresses(struct parisc_device *dev, int num_addrs,
519 int module_instance)
520 {
521 int i;
522 long status;
523 struct pdc_system_map_addr_info addr_result;
524
525 dev->addr = kmalloc_array(num_addrs, sizeof(*dev->addr), GFP_KERNEL);
526 if(!dev->addr) {
527 printk(KERN_ERR "%s %s(): memory allocation failure\n",
528 __FILE__, __func__);
529 return;
530 }
531
532 for(i = 1; i <= num_addrs; ++i) {
533 status = pdc_system_map_find_addrs(&addr_result,
534 module_instance, i);
535 if(PDC_OK == status) {
536 dev->addr[dev->num_addrs] = (unsigned long)addr_result.mod_addr;
537 dev->num_addrs++;
538 } else {
539 printk(KERN_WARNING
540 "Bad PDC_FIND_ADDRESS status return (%ld) for index %d\n",
541 status, i);
542 }
543 }
544 }
545
546 /**
547 * system_map_inventory - Retrieve firmware devices via SYSTEM_MAP.
548 *
549 * This function attempts to retrieve and register all the devices firmware
550 * knows about via the SYSTEM_MAP PDC call.
551 */
system_map_inventory(void)552 static void __init system_map_inventory(void)
553 {
554 int i;
555 long status = PDC_OK;
556
557 for (i = 0; i < 256; i++) {
558 struct parisc_device *dev;
559 struct pdc_system_map_mod_info module_result;
560 struct pdc_module_path module_path;
561
562 status = pdc_system_map_find_mods(&module_result,
563 &module_path, i);
564 if ((status == PDC_BAD_PROC) || (status == PDC_NE_MOD))
565 break;
566 if (status != PDC_OK)
567 continue;
568
569 dev = alloc_pa_dev(module_result.mod_addr, &module_path.path);
570 if (!dev)
571 continue;
572
573 register_parisc_device(dev);
574
575 /* if available, get the additional addresses for a module */
576 if (!module_result.add_addrs)
577 continue;
578
579 add_system_map_addresses(dev, module_result.add_addrs, i);
580 }
581
582 walk_central_bus();
583 return;
584 }
585
do_memory_inventory(void)586 void __init do_memory_inventory(void)
587 {
588 switch (pdc_type) {
589
590 case PDC_TYPE_PAT:
591 pat_memconfig();
592 break;
593
594 case PDC_TYPE_SYSTEM_MAP:
595 sprockets_memconfig();
596 break;
597
598 case PDC_TYPE_SNAKE:
599 pagezero_memconfig();
600 return;
601
602 default:
603 panic("Unknown PDC type!\n");
604 }
605
606 if (npmem_ranges == 0 || pmem_ranges[0].start_pfn != 0) {
607 printk(KERN_WARNING "Bad memory configuration returned!\n");
608 printk(KERN_WARNING "Some memory may not be used!\n");
609 pagezero_memconfig();
610 }
611 }
612
do_device_inventory(void)613 void __init do_device_inventory(void)
614 {
615 printk(KERN_INFO "Searching for devices...\n");
616
617 init_parisc_bus();
618
619 switch (pdc_type) {
620
621 case PDC_TYPE_PAT:
622 pat_inventory();
623 break;
624
625 case PDC_TYPE_SYSTEM_MAP:
626 system_map_inventory();
627 break;
628
629 case PDC_TYPE_SNAKE:
630 snake_inventory();
631 break;
632
633 default:
634 panic("Unknown PDC type!\n");
635 }
636 printk(KERN_INFO "Found devices:\n");
637 print_parisc_devices();
638
639 #if defined(CONFIG_64BIT) && defined(CONFIG_SMP)
640 pa_serialize_tlb_flushes = machine_has_merced_bus();
641 if (pa_serialize_tlb_flushes)
642 pr_info("Merced bus found: Enable PxTLB serialization.\n");
643 #endif
644 }
645