3009701eb90d89b7dfe708ee499e97a6f61ab85d
[linux-2.6.git] / arch / ppc64 / kernel / pSeries_setup.c
1 /*
2  *  linux/arch/ppc/kernel/setup.c
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 #undef DEBUG
20
21 #include <linux/config.h>
22 #include <linux/cpu.h>
23 #include <linux/errno.h>
24 #include <linux/sched.h>
25 #include <linux/kernel.h>
26 #include <linux/mm.h>
27 #include <linux/stddef.h>
28 #include <linux/unistd.h>
29 #include <linux/slab.h>
30 #include <linux/user.h>
31 #include <linux/a.out.h>
32 #include <linux/tty.h>
33 #include <linux/major.h>
34 #include <linux/interrupt.h>
35 #include <linux/reboot.h>
36 #include <linux/init.h>
37 #include <linux/ioport.h>
38 #include <linux/console.h>
39 #include <linux/pci.h>
40 #include <linux/utsname.h>
41 #include <linux/adb.h>
42 #include <linux/module.h>
43 #include <linux/delay.h>
44 #include <linux/irq.h>
45 #include <linux/seq_file.h>
46 #include <linux/root_dev.h>
47
48 #include <asm/mmu.h>
49 #include <asm/processor.h>
50 #include <asm/io.h>
51 #include <asm/pgtable.h>
52 #include <asm/prom.h>
53 #include <asm/rtas.h>
54 #include <asm/pci-bridge.h>
55 #include <asm/iommu.h>
56 #include <asm/dma.h>
57 #include <asm/machdep.h>
58 #include <asm/irq.h>
59 #include <asm/time.h>
60 #include <asm/nvram.h>
61 #include <asm/plpar_wrappers.h>
62 #include <asm/xics.h>
63 #include <asm/firmware.h>
64 #include <asm/pmc.h>
65
66 #include "i8259.h"
67 #include "mpic.h"
68 #include "pci.h"
69
70 #ifdef DEBUG
71 #define DBG(fmt...) udbg_printf(fmt)
72 #else
73 #define DBG(fmt...)
74 #endif
75
76 extern void find_udbg_vterm(void);
77 extern void system_reset_fwnmi(void);   /* from head.S */
78 extern void machine_check_fwnmi(void);  /* from head.S */
79 extern void generic_find_legacy_serial_ports(u64 *physport,
80                 unsigned int *default_speed);
81
82 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
83
84 extern void pSeries_system_reset_exception(struct pt_regs *regs);
85 extern int pSeries_machine_check_exception(struct pt_regs *regs);
86
87 static int pseries_shared_idle(void);
88 static int pseries_dedicated_idle(void);
89
90 static volatile void __iomem * chrp_int_ack_special;
91 struct mpic *pSeries_mpic;
92
93 void pSeries_get_cpuinfo(struct seq_file *m)
94 {
95         struct device_node *root;
96         const char *model = "";
97
98         root = of_find_node_by_path("/");
99         if (root)
100                 model = get_property(root, "model", NULL);
101         seq_printf(m, "machine\t\t: CHRP %s\n", model);
102         of_node_put(root);
103 }
104
105 /* Initialize firmware assisted non-maskable interrupts if
106  * the firmware supports this feature.
107  *
108  */
109 static void __init fwnmi_init(void)
110 {
111         int ret;
112         int ibm_nmi_register = rtas_token("ibm,nmi-register");
113         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
114                 return;
115         ret = rtas_call(ibm_nmi_register, 2, 1, NULL,
116                         __pa((unsigned long)system_reset_fwnmi),
117                         __pa((unsigned long)machine_check_fwnmi));
118         if (ret == 0)
119                 fwnmi_active = 1;
120 }
121
122 static int pSeries_irq_cascade(struct pt_regs *regs, void *data)
123 {
124         if (chrp_int_ack_special)
125                 return readb(chrp_int_ack_special);
126         else
127                 return i8259_irq(smp_processor_id());
128 }
129
130 static void __init pSeries_init_mpic(void)
131 {
132         unsigned int *addrp;
133         struct device_node *np;
134         int i;
135
136         /* All ISUs are setup, complete initialization */
137         mpic_init(pSeries_mpic);
138
139         /* Check what kind of cascade ACK we have */
140         if (!(np = of_find_node_by_name(NULL, "pci"))
141             || !(addrp = (unsigned int *)
142                  get_property(np, "8259-interrupt-acknowledge", NULL)))
143                 printk(KERN_ERR "Cannot find pci to get ack address\n");
144         else
145                 chrp_int_ack_special = ioremap(addrp[prom_n_addr_cells(np)-1], 1);
146         of_node_put(np);
147
148         /* Setup the legacy interrupts & controller */
149         for (i = 0; i < NUM_ISA_INTERRUPTS; i++)
150                 irq_desc[i].handler = &i8259_pic;
151         i8259_init(0);
152
153         /* Hook cascade to mpic */
154         mpic_setup_cascade(NUM_ISA_INTERRUPTS, pSeries_irq_cascade, NULL);
155 }
156
157 static void __init pSeries_setup_mpic(void)
158 {
159         unsigned int *opprop;
160         unsigned long openpic_addr = 0;
161         unsigned char senses[NR_IRQS - NUM_ISA_INTERRUPTS];
162         struct device_node *root;
163         int irq_count;
164
165         /* Find the Open PIC if present */
166         root = of_find_node_by_path("/");
167         opprop = (unsigned int *) get_property(root, "platform-open-pic", NULL);
168         if (opprop != 0) {
169                 int n = prom_n_addr_cells(root);
170
171                 for (openpic_addr = 0; n > 0; --n)
172                         openpic_addr = (openpic_addr << 32) + *opprop++;
173                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
174         }
175         of_node_put(root);
176
177         BUG_ON(openpic_addr == 0);
178
179         /* Get the sense values from OF */
180         prom_get_irq_senses(senses, NUM_ISA_INTERRUPTS, NR_IRQS);
181         
182         /* Setup the openpic driver */
183         irq_count = NR_IRQS - NUM_ISA_INTERRUPTS - 4; /* leave room for IPIs */
184         pSeries_mpic = mpic_alloc(openpic_addr, MPIC_PRIMARY,
185                                   16, 16, irq_count, /* isu size, irq offset, irq count */ 
186                                   NR_IRQS - 4, /* ipi offset */
187                                   senses, irq_count, /* sense & sense size */
188                                   " MPIC     ");
189 }
190
191 static void pseries_lpar_enable_pmcs(void)
192 {
193         unsigned long set, reset;
194
195         power4_enable_pmcs();
196
197         set = 1UL << 63;
198         reset = 0;
199         plpar_hcall_norets(H_PERFMON, set, reset);
200
201         /* instruct hypervisor to maintain PMCs */
202         if (firmware_has_feature(FW_FEATURE_SPLPAR))
203                 get_paca()->lppaca.pmcregs_in_use = 1;
204 }
205
206 static void __init pSeries_setup_arch(void)
207 {
208         /* Fixup ppc_md depending on the type of interrupt controller */
209         if (ppc64_interrupt_controller == IC_OPEN_PIC) {
210                 ppc_md.init_IRQ       = pSeries_init_mpic;
211                 ppc_md.get_irq        = mpic_get_irq;
212                 ppc_md.cpu_irq_down   = mpic_teardown_this_cpu;
213                 /* Allocate the mpic now, so that find_and_init_phbs() can
214                  * fill the ISUs */
215                 pSeries_setup_mpic();
216         } else {
217                 ppc_md.init_IRQ       = xics_init_IRQ;
218                 ppc_md.get_irq        = xics_get_irq;
219                 ppc_md.cpu_irq_down   = xics_teardown_cpu;
220         }
221
222 #ifdef CONFIG_SMP
223         smp_init_pSeries();
224 #endif
225         /* openpic global configuration register (64-bit format). */
226         /* openpic Interrupt Source Unit pointer (64-bit format). */
227         /* python0 facility area (mmio) (64-bit format) REAL address. */
228
229         /* init to some ~sane value until calibrate_delay() runs */
230         loops_per_jiffy = 50000000;
231
232         if (ROOT_DEV == 0) {
233                 printk("No ramdisk, default root is /dev/sda2\n");
234                 ROOT_DEV = Root_SDA2;
235         }
236
237         fwnmi_init();
238
239         /* Find and initialize PCI host bridges */
240         init_pci_config_tokens();
241         find_and_init_phbs();
242         eeh_init();
243
244 #ifdef CONFIG_DUMMY_CONSOLE
245         conswitchp = &dummy_con;
246 #endif
247
248         pSeries_nvram_init();
249
250         /* Choose an idle loop */
251         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
252                 vpa_init(boot_cpuid);
253                 if (get_paca()->lppaca.shared_proc) {
254                         printk(KERN_INFO "Using shared processor idle loop\n");
255                         ppc_md.idle_loop = pseries_shared_idle;
256                 } else {
257                         printk(KERN_INFO "Using dedicated idle loop\n");
258                         ppc_md.idle_loop = pseries_dedicated_idle;
259                 }
260         } else {
261                 printk(KERN_INFO "Using default idle loop\n");
262                 ppc_md.idle_loop = default_idle;
263         }
264
265         if (systemcfg->platform & PLATFORM_LPAR)
266                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
267         else
268                 ppc_md.enable_pmcs = power4_enable_pmcs;
269 }
270
271 static int __init pSeries_init_panel(void)
272 {
273         /* Manually leave the kernel version on the panel. */
274         ppc_md.progress("Linux ppc64\n", 0);
275         ppc_md.progress(system_utsname.version, 0);
276
277         return 0;
278 }
279 arch_initcall(pSeries_init_panel);
280
281
282 /* Build up the ppc64_firmware_features bitmask field
283  * using contents of device-tree/ibm,hypertas-functions.
284  * Ultimately this functionality may be moved into prom.c prom_init().
285  */
286 static void __init fw_feature_init(void)
287 {
288         struct device_node * dn;
289         char * hypertas;
290         unsigned int len;
291
292         DBG(" -> fw_feature_init()\n");
293
294         ppc64_firmware_features = 0;
295         dn = of_find_node_by_path("/rtas");
296         if (dn == NULL) {
297                 printk(KERN_ERR "WARNING ! Cannot find RTAS in device-tree !\n");
298                 goto no_rtas;
299         }
300
301         hypertas = get_property(dn, "ibm,hypertas-functions", &len);
302         if (hypertas) {
303                 while (len > 0){
304                         int i, hypertas_len;
305                         /* check value against table of strings */
306                         for(i=0; i < FIRMWARE_MAX_FEATURES ;i++) {
307                                 if ((firmware_features_table[i].name) &&
308                                     (strcmp(firmware_features_table[i].name,hypertas))==0) {
309                                         /* we have a match */
310                                         ppc64_firmware_features |= 
311                                                 (firmware_features_table[i].val);
312                                         break;
313                                 } 
314                         }
315                         hypertas_len = strlen(hypertas);
316                         len -= hypertas_len +1;
317                         hypertas+= hypertas_len +1;
318                 }
319         }
320
321         of_node_put(dn);
322  no_rtas:
323         printk(KERN_INFO "firmware_features = 0x%lx\n", 
324                ppc64_firmware_features);
325
326         DBG(" <- fw_feature_init()\n");
327 }
328
329
330 static  void __init pSeries_discover_pic(void)
331 {
332         struct device_node *np;
333         char *typep;
334
335         /*
336          * Setup interrupt mapping options that are needed for finish_device_tree
337          * to properly parse the OF interrupt tree & do the virtual irq mapping
338          */
339         __irq_offset_value = NUM_ISA_INTERRUPTS;
340         ppc64_interrupt_controller = IC_INVALID;
341         for (np = NULL; (np = of_find_node_by_name(np, "interrupt-controller"));) {
342                 typep = (char *)get_property(np, "compatible", NULL);
343                 if (strstr(typep, "open-pic"))
344                         ppc64_interrupt_controller = IC_OPEN_PIC;
345                 else if (strstr(typep, "ppc-xicp"))
346                         ppc64_interrupt_controller = IC_PPC_XIC;
347                 else
348                         printk("pSeries_discover_pic: failed to recognize"
349                                " interrupt-controller\n");
350                 break;
351         }
352 }
353
354 static void pSeries_mach_cpu_die(void)
355 {
356         local_irq_disable();
357         idle_task_exit();
358         /* Some hardware requires clearing the CPPR, while other hardware does not
359          * it is safe either way
360          */
361         pSeriesLP_cppr_info(0, 0);
362         rtas_stop_self();
363         /* Should never get here... */
364         BUG();
365         for(;;);
366 }
367
368
369 /*
370  * Early initialization.  Relocation is on but do not reference unbolted pages
371  */
372 static void __init pSeries_init_early(void)
373 {
374         void *comport;
375         int iommu_off = 0;
376         unsigned int default_speed;
377         u64 physport;
378
379         DBG(" -> pSeries_init_early()\n");
380
381         fw_feature_init();
382         
383         if (systemcfg->platform & PLATFORM_LPAR)
384                 hpte_init_lpar();
385         else {
386                 hpte_init_native();
387                 iommu_off = (of_chosen &&
388                              get_property(of_chosen, "linux,iommu-off", NULL));
389         }
390
391         generic_find_legacy_serial_ports(&physport, &default_speed);
392
393         if (systemcfg->platform & PLATFORM_LPAR)
394                 find_udbg_vterm();
395         else if (physport) {
396                 /* Map the uart for udbg. */
397                 comport = (void *)ioremap(physport, 16);
398                 udbg_init_uart(comport, default_speed);
399
400                 DBG("Hello World !\n");
401         }
402
403
404         iommu_init_early_pSeries();
405
406         pSeries_discover_pic();
407
408         DBG(" <- pSeries_init_early()\n");
409 }
410
411
412 static int pSeries_check_legacy_ioport(unsigned int baseport)
413 {
414         struct device_node *np;
415
416 #define I8042_DATA_REG  0x60
417 #define FDC_BASE        0x3f0
418
419
420         switch(baseport) {
421         case I8042_DATA_REG:
422                 np = of_find_node_by_type(NULL, "8042");
423                 if (np == NULL)
424                         return -ENODEV;
425                 of_node_put(np);
426                 break;
427         case FDC_BASE:
428                 np = of_find_node_by_type(NULL, "fdc");
429                 if (np == NULL)
430                         return -ENODEV;
431                 of_node_put(np);
432                 break;
433         }
434         return 0;
435 }
436
437 /*
438  * Called very early, MMU is off, device-tree isn't unflattened
439  */
440 extern struct machdep_calls pSeries_md;
441
442 static int __init pSeries_probe(int platform)
443 {
444         if (platform != PLATFORM_PSERIES &&
445             platform != PLATFORM_PSERIES_LPAR)
446                 return 0;
447
448         /* if we have some ppc_md fixups for LPAR to do, do
449          * it here ...
450          */
451
452         return 1;
453 }
454
455 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
456
457 static inline void dedicated_idle_sleep(unsigned int cpu)
458 {
459         struct paca_struct *ppaca = &paca[cpu ^ 1];
460
461         /* Only sleep if the other thread is not idle */
462         if (!(ppaca->lppaca.idle)) {
463                 local_irq_disable();
464
465                 /*
466                  * We are about to sleep the thread and so wont be polling any
467                  * more.
468                  */
469                 clear_thread_flag(TIF_POLLING_NRFLAG);
470
471                 /*
472                  * SMT dynamic mode. Cede will result in this thread going
473                  * dormant, if the partner thread is still doing work.  Thread
474                  * wakes up if partner goes idle, an interrupt is presented, or
475                  * a prod occurs.  Returning from the cede enables external
476                  * interrupts.
477                  */
478                 if (!need_resched())
479                         cede_processor();
480                 else
481                         local_irq_enable();
482         } else {
483                 /*
484                  * Give the HV an opportunity at the processor, since we are
485                  * not doing any work.
486                  */
487                 poll_pending();
488         }
489 }
490
491 static int pseries_dedicated_idle(void)
492 {
493         long oldval;
494         struct paca_struct *lpaca = get_paca();
495         unsigned int cpu = smp_processor_id();
496         unsigned long start_snooze;
497         unsigned long *smt_snooze_delay = &__get_cpu_var(smt_snooze_delay);
498
499         while (1) {
500                 /*
501                  * Indicate to the HV that we are idle. Now would be
502                  * a good time to find other work to dispatch.
503                  */
504                 lpaca->lppaca.idle = 1;
505
506                 oldval = test_and_clear_thread_flag(TIF_NEED_RESCHED);
507                 if (!oldval) {
508                         set_thread_flag(TIF_POLLING_NRFLAG);
509
510                         start_snooze = __get_tb() +
511                                 *smt_snooze_delay * tb_ticks_per_usec;
512
513                         while (!need_resched() && !cpu_is_offline(cpu)) {
514                                 ppc64_runlatch_off();
515
516                                 /*
517                                  * Go into low thread priority and possibly
518                                  * low power mode.
519                                  */
520                                 HMT_low();
521                                 HMT_very_low();
522
523                                 if (*smt_snooze_delay != 0 &&
524                                     __get_tb() > start_snooze) {
525                                         HMT_medium();
526                                         dedicated_idle_sleep(cpu);
527                                 }
528
529                         }
530
531                         HMT_medium();
532                         clear_thread_flag(TIF_POLLING_NRFLAG);
533                 } else {
534                         set_need_resched();
535                 }
536
537                 lpaca->lppaca.idle = 0;
538                 ppc64_runlatch_on();
539
540                 schedule();
541
542                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
543                         cpu_die();
544         }
545 }
546
547 static int pseries_shared_idle(void)
548 {
549         struct paca_struct *lpaca = get_paca();
550         unsigned int cpu = smp_processor_id();
551
552         while (1) {
553                 /*
554                  * Indicate to the HV that we are idle. Now would be
555                  * a good time to find other work to dispatch.
556                  */
557                 lpaca->lppaca.idle = 1;
558
559                 while (!need_resched() && !cpu_is_offline(cpu)) {
560                         local_irq_disable();
561                         ppc64_runlatch_off();
562
563                         /*
564                          * Yield the processor to the hypervisor.  We return if
565                          * an external interrupt occurs (which are driven prior
566                          * to returning here) or if a prod occurs from another
567                          * processor. When returning here, external interrupts
568                          * are enabled.
569                          *
570                          * Check need_resched() again with interrupts disabled
571                          * to avoid a race.
572                          */
573                         if (!need_resched())
574                                 cede_processor();
575                         else
576                                 local_irq_enable();
577
578                         HMT_medium();
579                 }
580
581                 lpaca->lppaca.idle = 0;
582                 ppc64_runlatch_on();
583
584                 schedule();
585
586                 if (cpu_is_offline(cpu) && system_state == SYSTEM_RUNNING)
587                         cpu_die();
588         }
589
590         return 0;
591 }
592
593 static int pSeries_pci_probe_mode(struct pci_bus *bus)
594 {
595         if (systemcfg->platform & PLATFORM_LPAR)
596                 return PCI_PROBE_DEVTREE;
597         return PCI_PROBE_NORMAL;
598 }
599
600 struct machdep_calls __initdata pSeries_md = {
601         .probe                  = pSeries_probe,
602         .setup_arch             = pSeries_setup_arch,
603         .init_early             = pSeries_init_early,
604         .get_cpuinfo            = pSeries_get_cpuinfo,
605         .log_error              = pSeries_log_error,
606         .pcibios_fixup          = pSeries_final_fixup,
607         .pci_probe_mode         = pSeries_pci_probe_mode,
608         .irq_bus_setup          = pSeries_irq_bus_setup,
609         .restart                = rtas_restart,
610         .power_off              = rtas_power_off,
611         .halt                   = rtas_halt,
612         .panic                  = rtas_os_term,
613         .cpu_die                = pSeries_mach_cpu_die,
614         .get_boot_time          = rtas_get_boot_time,
615         .get_rtc_time           = rtas_get_rtc_time,
616         .set_rtc_time           = rtas_set_rtc_time,
617         .calibrate_decr         = generic_calibrate_decr,
618         .progress               = rtas_progress,
619         .check_legacy_ioport    = pSeries_check_legacy_ioport,
620         .system_reset_exception = pSeries_system_reset_exception,
621         .machine_check_exception = pSeries_machine_check_exception,
622 };