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

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