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TOMOYO Linux Cross Reference
Linux/arch/parisc/kernel/inventory.c

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

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