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TOMOYO Linux Cross Reference
Linux/arch/powerpc/platforms/pseries/setup.c

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  1 /*
  2  *  64-bit pSeries and RS/6000 setup code.
  3  *
  4  *  Copyright (C) 1995  Linus Torvalds
  5  *  Adapted from 'alpha' version by Gary Thomas
  6  *  Modified by Cort Dougan (cort@cs.nmt.edu)
  7  *  Modified by PPC64 Team, IBM Corp
  8  *
  9  * This program is free software; you can redistribute it and/or
 10  * modify it under the terms of the GNU General Public License
 11  * as published by the Free Software Foundation; either version
 12  * 2 of the License, or (at your option) any later version.
 13  */
 14 
 15 /*
 16  * bootup setup stuff..
 17  */
 18 
 19 #include <linux/cpu.h>
 20 #include <linux/errno.h>
 21 #include <linux/sched.h>
 22 #include <linux/kernel.h>
 23 #include <linux/mm.h>
 24 #include <linux/stddef.h>
 25 #include <linux/unistd.h>
 26 #include <linux/slab.h>
 27 #include <linux/user.h>
 28 #include <linux/tty.h>
 29 #include <linux/major.h>
 30 #include <linux/interrupt.h>
 31 #include <linux/reboot.h>
 32 #include <linux/init.h>
 33 #include <linux/ioport.h>
 34 #include <linux/console.h>
 35 #include <linux/pci.h>
 36 #include <linux/utsname.h>
 37 #include <linux/adb.h>
 38 #include <linux/module.h>
 39 #include <linux/delay.h>
 40 #include <linux/irq.h>
 41 #include <linux/seq_file.h>
 42 #include <linux/root_dev.h>
 43 
 44 #include <asm/mmu.h>
 45 #include <asm/processor.h>
 46 #include <asm/io.h>
 47 #include <asm/pgtable.h>
 48 #include <asm/prom.h>
 49 #include <asm/rtas.h>
 50 #include <asm/pci-bridge.h>
 51 #include <asm/iommu.h>
 52 #include <asm/dma.h>
 53 #include <asm/machdep.h>
 54 #include <asm/irq.h>
 55 #include <asm/time.h>
 56 #include <asm/nvram.h>
 57 #include "xics.h"
 58 #include <asm/pmc.h>
 59 #include <asm/mpic.h>
 60 #include <asm/ppc-pci.h>
 61 #include <asm/i8259.h>
 62 #include <asm/udbg.h>
 63 #include <asm/smp.h>
 64 #include <asm/firmware.h>
 65 #include <asm/eeh.h>
 66 #include <asm/pSeries_reconfig.h>
 67 
 68 #include "plpar_wrappers.h"
 69 #include "pseries.h"
 70 
 71 int CMO_PrPSP = -1;
 72 int CMO_SecPSP = -1;
 73 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
 74 EXPORT_SYMBOL(CMO_PageSize);
 75 
 76 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
 77 
 78 static void pseries_shared_idle_sleep(void);
 79 static void pseries_dedicated_idle_sleep(void);
 80 
 81 static struct device_node *pSeries_mpic_node;
 82 
 83 static void pSeries_show_cpuinfo(struct seq_file *m)
 84 {
 85         struct device_node *root;
 86         const char *model = "";
 87 
 88         root = of_find_node_by_path("/");
 89         if (root)
 90                 model = of_get_property(root, "model", NULL);
 91         seq_printf(m, "machine\t\t: CHRP %s\n", model);
 92         of_node_put(root);
 93 }
 94 
 95 /* Initialize firmware assisted non-maskable interrupts if
 96  * the firmware supports this feature.
 97  */
 98 static void __init fwnmi_init(void)
 99 {
100         unsigned long system_reset_addr, machine_check_addr;
101 
102         int ibm_nmi_register = rtas_token("ibm,nmi-register");
103         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
104                 return;
105 
106         /* If the kernel's not linked at zero we point the firmware at low
107          * addresses anyway, and use a trampoline to get to the real code. */
108         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
109         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
110 
111         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
112                                 machine_check_addr))
113                 fwnmi_active = 1;
114 }
115 
116 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
117 {
118         unsigned int cascade_irq = i8259_irq();
119         if (cascade_irq != NO_IRQ)
120                 generic_handle_irq(cascade_irq);
121         desc->chip->eoi(irq);
122 }
123 
124 static void __init pseries_setup_i8259_cascade(void)
125 {
126         struct device_node *np, *old, *found = NULL;
127         unsigned int cascade;
128         const u32 *addrp;
129         unsigned long intack = 0;
130         int naddr;
131 
132         for_each_node_by_type(np, "interrupt-controller") {
133                 if (of_device_is_compatible(np, "chrp,iic")) {
134                         found = np;
135                         break;
136                 }
137         }
138 
139         if (found == NULL) {
140                 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
141                 return;
142         }
143 
144         cascade = irq_of_parse_and_map(found, 0);
145         if (cascade == NO_IRQ) {
146                 printk(KERN_ERR "pic: failed to map cascade interrupt");
147                 return;
148         }
149         pr_debug("pic: cascade mapped to irq %d\n", cascade);
150 
151         for (old = of_node_get(found); old != NULL ; old = np) {
152                 np = of_get_parent(old);
153                 of_node_put(old);
154                 if (np == NULL)
155                         break;
156                 if (strcmp(np->name, "pci") != 0)
157                         continue;
158                 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
159                 if (addrp == NULL)
160                         continue;
161                 naddr = of_n_addr_cells(np);
162                 intack = addrp[naddr-1];
163                 if (naddr > 1)
164                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
165         }
166         if (intack)
167                 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
168         i8259_init(found, intack);
169         of_node_put(found);
170         set_irq_chained_handler(cascade, pseries_8259_cascade);
171 }
172 
173 static void __init pseries_mpic_init_IRQ(void)
174 {
175         struct device_node *np;
176         const unsigned int *opprop;
177         unsigned long openpic_addr = 0;
178         int naddr, n, i, opplen;
179         struct mpic *mpic;
180 
181         np = of_find_node_by_path("/");
182         naddr = of_n_addr_cells(np);
183         opprop = of_get_property(np, "platform-open-pic", &opplen);
184         if (opprop != 0) {
185                 openpic_addr = of_read_number(opprop, naddr);
186                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
187         }
188         of_node_put(np);
189 
190         BUG_ON(openpic_addr == 0);
191 
192         /* Setup the openpic driver */
193         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
194                           MPIC_PRIMARY,
195                           16, 250, /* isu size, irq count */
196                           " MPIC     ");
197         BUG_ON(mpic == NULL);
198 
199         /* Add ISUs */
200         opplen /= sizeof(u32);
201         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
202                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
203                 mpic_assign_isu(mpic, n, isuaddr);
204         }
205 
206         /* All ISUs are setup, complete initialization */
207         mpic_init(mpic);
208 
209         /* Look for cascade */
210         pseries_setup_i8259_cascade();
211 }
212 
213 static void __init pseries_xics_init_IRQ(void)
214 {
215         xics_init_IRQ();
216         pseries_setup_i8259_cascade();
217 }
218 
219 static void pseries_lpar_enable_pmcs(void)
220 {
221         unsigned long set, reset;
222 
223         set = 1UL << 63;
224         reset = 0;
225         plpar_hcall_norets(H_PERFMON, set, reset);
226 }
227 
228 static void __init pseries_discover_pic(void)
229 {
230         struct device_node *np;
231         const char *typep;
232 
233         for (np = NULL; (np = of_find_node_by_name(np,
234                                                    "interrupt-controller"));) {
235                 typep = of_get_property(np, "compatible", NULL);
236                 if (strstr(typep, "open-pic")) {
237                         pSeries_mpic_node = of_node_get(np);
238                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
239                         ppc_md.get_irq        = mpic_get_irq;
240                         setup_kexec_cpu_down_mpic();
241                         smp_init_pseries_mpic();
242                         return;
243                 } else if (strstr(typep, "ppc-xicp")) {
244                         ppc_md.init_IRQ       = pseries_xics_init_IRQ;
245                         setup_kexec_cpu_down_xics();
246                         smp_init_pseries_xics();
247                         return;
248                 }
249         }
250         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
251                " interrupt-controller\n");
252 }
253 
254 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
255 {
256         struct device_node *np = node;
257         struct pci_dn *pci = NULL;
258         int err = NOTIFY_OK;
259 
260         switch (action) {
261         case PSERIES_RECONFIG_ADD:
262                 pci = np->parent->data;
263                 if (pci)
264                         update_dn_pci_info(np, pci->phb);
265                 break;
266         default:
267                 err = NOTIFY_DONE;
268                 break;
269         }
270         return err;
271 }
272 
273 static struct notifier_block pci_dn_reconfig_nb = {
274         .notifier_call = pci_dn_reconfig_notifier,
275 };
276 
277 static void __init pSeries_setup_arch(void)
278 {
279         /* Discover PIC type and setup ppc_md accordingly */
280         pseries_discover_pic();
281 
282         /* openpic global configuration register (64-bit format). */
283         /* openpic Interrupt Source Unit pointer (64-bit format). */
284         /* python0 facility area (mmio) (64-bit format) REAL address. */
285 
286         /* init to some ~sane value until calibrate_delay() runs */
287         loops_per_jiffy = 50000000;
288 
289         fwnmi_init();
290 
291         /* Find and initialize PCI host bridges */
292         init_pci_config_tokens();
293         find_and_init_phbs();
294         pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
295         eeh_init();
296 
297         pSeries_nvram_init();
298 
299         /* Choose an idle loop */
300         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
301                 vpa_init(boot_cpuid);
302                 if (get_lppaca()->shared_proc) {
303                         printk(KERN_DEBUG "Using shared processor idle loop\n");
304                         ppc_md.power_save = pseries_shared_idle_sleep;
305                 } else {
306                         printk(KERN_DEBUG "Using dedicated idle loop\n");
307                         ppc_md.power_save = pseries_dedicated_idle_sleep;
308                 }
309         } else {
310                 printk(KERN_DEBUG "Using default idle loop\n");
311         }
312 
313         if (firmware_has_feature(FW_FEATURE_LPAR))
314                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
315         else
316                 ppc_md.enable_pmcs = power4_enable_pmcs;
317 }
318 
319 static int __init pSeries_init_panel(void)
320 {
321         /* Manually leave the kernel version on the panel. */
322         ppc_md.progress("Linux ppc64\n", 0);
323         ppc_md.progress(init_utsname()->version, 0);
324 
325         return 0;
326 }
327 arch_initcall(pSeries_init_panel);
328 
329 static int pseries_set_dabr(unsigned long dabr)
330 {
331         return plpar_hcall_norets(H_SET_DABR, dabr);
332 }
333 
334 static int pseries_set_xdabr(unsigned long dabr)
335 {
336         /* We want to catch accesses from kernel and userspace */
337         return plpar_hcall_norets(H_SET_XDABR, dabr,
338                         H_DABRX_KERNEL | H_DABRX_USER);
339 }
340 
341 #define CMO_CHARACTERISTICS_TOKEN 44
342 #define CMO_MAXLENGTH 1026
343 
344 /**
345  * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
346  * handle that here. (Stolen from parse_system_parameter_string)
347  */
348 void pSeries_cmo_feature_init(void)
349 {
350         char *ptr, *key, *value, *end;
351         int call_status;
352         int page_order = IOMMU_PAGE_SHIFT;
353 
354         pr_debug(" -> fw_cmo_feature_init()\n");
355         spin_lock(&rtas_data_buf_lock);
356         memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
357         call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
358                                 NULL,
359                                 CMO_CHARACTERISTICS_TOKEN,
360                                 __pa(rtas_data_buf),
361                                 RTAS_DATA_BUF_SIZE);
362 
363         if (call_status != 0) {
364                 spin_unlock(&rtas_data_buf_lock);
365                 pr_debug("CMO not available\n");
366                 pr_debug(" <- fw_cmo_feature_init()\n");
367                 return;
368         }
369 
370         end = rtas_data_buf + CMO_MAXLENGTH - 2;
371         ptr = rtas_data_buf + 2;        /* step over strlen value */
372         key = value = ptr;
373 
374         while (*ptr && (ptr <= end)) {
375                 /* Separate the key and value by replacing '=' with '\0' and
376                  * point the value at the string after the '='
377                  */
378                 if (ptr[0] == '=') {
379                         ptr[0] = '\0';
380                         value = ptr + 1;
381                 } else if (ptr[0] == '\0' || ptr[0] == ',') {
382                         /* Terminate the string containing the key/value pair */
383                         ptr[0] = '\0';
384 
385                         if (key == value) {
386                                 pr_debug("Malformed key/value pair\n");
387                                 /* Never found a '=', end processing */
388                                 break;
389                         }
390 
391                         if (0 == strcmp(key, "CMOPageSize"))
392                                 page_order = simple_strtol(value, NULL, 10);
393                         else if (0 == strcmp(key, "PrPSP"))
394                                 CMO_PrPSP = simple_strtol(value, NULL, 10);
395                         else if (0 == strcmp(key, "SecPSP"))
396                                 CMO_SecPSP = simple_strtol(value, NULL, 10);
397                         value = key = ptr + 1;
398                 }
399                 ptr++;
400         }
401 
402         /* Page size is returned as the power of 2 of the page size,
403          * convert to the page size in bytes before returning
404          */
405         CMO_PageSize = 1 << page_order;
406         pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
407 
408         if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
409                 pr_info("CMO enabled\n");
410                 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
411                          CMO_SecPSP);
412                 powerpc_firmware_features |= FW_FEATURE_CMO;
413         } else
414                 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
415                          CMO_SecPSP);
416         spin_unlock(&rtas_data_buf_lock);
417         pr_debug(" <- fw_cmo_feature_init()\n");
418 }
419 
420 /*
421  * Early initialization.  Relocation is on but do not reference unbolted pages
422  */
423 static void __init pSeries_init_early(void)
424 {
425         pr_debug(" -> pSeries_init_early()\n");
426 
427         if (firmware_has_feature(FW_FEATURE_LPAR))
428                 find_udbg_vterm();
429 
430         if (firmware_has_feature(FW_FEATURE_DABR))
431                 ppc_md.set_dabr = pseries_set_dabr;
432         else if (firmware_has_feature(FW_FEATURE_XDABR))
433                 ppc_md.set_dabr = pseries_set_xdabr;
434 
435         pSeries_cmo_feature_init();
436         iommu_init_early_pSeries();
437 
438         pr_debug(" <- pSeries_init_early()\n");
439 }
440 
441 /*
442  * Called very early, MMU is off, device-tree isn't unflattened
443  */
444 
445 static int __init pSeries_probe_hypertas(unsigned long node,
446                                          const char *uname, int depth,
447                                          void *data)
448 {
449         const char *hypertas;
450         unsigned long len;
451 
452         if (depth != 1 ||
453             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
454                 return 0;
455 
456         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
457         if (!hypertas)
458                 return 1;
459 
460         powerpc_firmware_features |= FW_FEATURE_LPAR;
461         fw_feature_init(hypertas, len);
462 
463         return 1;
464 }
465 
466 static int __init pSeries_probe(void)
467 {
468         unsigned long root = of_get_flat_dt_root();
469         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
470 
471         if (dtype == NULL)
472                 return 0;
473         if (strcmp(dtype, "chrp"))
474                 return 0;
475 
476         /* Cell blades firmware claims to be chrp while it's not. Until this
477          * is fixed, we need to avoid those here.
478          */
479         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
480             of_flat_dt_is_compatible(root, "IBM,CBEA"))
481                 return 0;
482 
483         pr_debug("pSeries detected, looking for LPAR capability...\n");
484 
485         /* Now try to figure out if we are running on LPAR */
486         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
487 
488         if (firmware_has_feature(FW_FEATURE_LPAR))
489                 hpte_init_lpar();
490         else
491                 hpte_init_native();
492 
493         pr_debug("Machine is%s LPAR !\n",
494                  (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
495 
496         return 1;
497 }
498 
499 
500 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
501 
502 static void pseries_dedicated_idle_sleep(void)
503 { 
504         unsigned int cpu = smp_processor_id();
505         unsigned long start_snooze;
506         unsigned long in_purr, out_purr;
507 
508         /*
509          * Indicate to the HV that we are idle. Now would be
510          * a good time to find other work to dispatch.
511          */
512         get_lppaca()->idle = 1;
513         get_lppaca()->donate_dedicated_cpu = 1;
514         in_purr = mfspr(SPRN_PURR);
515 
516         /*
517          * We come in with interrupts disabled, and need_resched()
518          * has been checked recently.  If we should poll for a little
519          * while, do so.
520          */
521         if (__get_cpu_var(smt_snooze_delay)) {
522                 start_snooze = get_tb() +
523                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
524                 local_irq_enable();
525                 set_thread_flag(TIF_POLLING_NRFLAG);
526 
527                 while (get_tb() < start_snooze) {
528                         if (need_resched() || cpu_is_offline(cpu))
529                                 goto out;
530                         ppc64_runlatch_off();
531                         HMT_low();
532                         HMT_very_low();
533                 }
534 
535                 HMT_medium();
536                 clear_thread_flag(TIF_POLLING_NRFLAG);
537                 smp_mb();
538                 local_irq_disable();
539                 if (need_resched() || cpu_is_offline(cpu))
540                         goto out;
541         }
542 
543         cede_processor();
544 
545 out:
546         HMT_medium();
547         out_purr = mfspr(SPRN_PURR);
548         get_lppaca()->wait_state_cycles += out_purr - in_purr;
549         get_lppaca()->donate_dedicated_cpu = 0;
550         get_lppaca()->idle = 0;
551 }
552 
553 static void pseries_shared_idle_sleep(void)
554 {
555         /*
556          * Indicate to the HV that we are idle. Now would be
557          * a good time to find other work to dispatch.
558          */
559         get_lppaca()->idle = 1;
560 
561         /*
562          * Yield the processor to the hypervisor.  We return if
563          * an external interrupt occurs (which are driven prior
564          * to returning here) or if a prod occurs from another
565          * processor. When returning here, external interrupts
566          * are enabled.
567          */
568         cede_processor();
569 
570         get_lppaca()->idle = 0;
571 }
572 
573 static int pSeries_pci_probe_mode(struct pci_bus *bus)
574 {
575         if (firmware_has_feature(FW_FEATURE_LPAR))
576                 return PCI_PROBE_DEVTREE;
577         return PCI_PROBE_NORMAL;
578 }
579 
580 /**
581  * pSeries_power_off - tell firmware about how to power off the system.
582  *
583  * This function calls either the power-off rtas token in normal cases
584  * or the ibm,power-off-ups token (if present & requested) in case of
585  * a power failure. If power-off token is used, power on will only be
586  * possible with power button press. If ibm,power-off-ups token is used
587  * it will allow auto poweron after power is restored.
588  */
589 static void pSeries_power_off(void)
590 {
591         int rc;
592         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
593 
594         if (rtas_flash_term_hook)
595                 rtas_flash_term_hook(SYS_POWER_OFF);
596 
597         if (rtas_poweron_auto == 0 ||
598                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
599                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
600                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
601         } else {
602                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
603                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
604         }
605         for (;;);
606 }
607 
608 #ifndef CONFIG_PCI
609 void pSeries_final_fixup(void) { }
610 #endif
611 
612 define_machine(pseries) {
613         .name                   = "pSeries",
614         .probe                  = pSeries_probe,
615         .setup_arch             = pSeries_setup_arch,
616         .init_early             = pSeries_init_early,
617         .show_cpuinfo           = pSeries_show_cpuinfo,
618         .log_error              = pSeries_log_error,
619         .pcibios_fixup          = pSeries_final_fixup,
620         .pci_probe_mode         = pSeries_pci_probe_mode,
621         .restart                = rtas_restart,
622         .power_off              = pSeries_power_off,
623         .halt                   = rtas_halt,
624         .panic                  = rtas_os_term,
625         .get_boot_time          = rtas_get_boot_time,
626         .get_rtc_time           = rtas_get_rtc_time,
627         .set_rtc_time           = rtas_set_rtc_time,
628         .calibrate_decr         = generic_calibrate_decr,
629         .progress               = rtas_progress,
630         .system_reset_exception = pSeries_system_reset_exception,
631         .machine_check_exception = pSeries_machine_check_exception,
632 };
633 

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