Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm
[linux-2.6] / arch / powerpc / platforms / pseries / setup.c
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 #undef DEBUG
20
21 #include <linux/cpu.h>
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
25 #include <linux/mm.h>
26 #include <linux/stddef.h>
27 #include <linux/unistd.h>
28 #include <linux/slab.h>
29 #include <linux/user.h>
30 #include <linux/a.out.h>
31 #include <linux/tty.h>
32 #include <linux/major.h>
33 #include <linux/interrupt.h>
34 #include <linux/reboot.h>
35 #include <linux/init.h>
36 #include <linux/ioport.h>
37 #include <linux/console.h>
38 #include <linux/pci.h>
39 #include <linux/utsname.h>
40 #include <linux/adb.h>
41 #include <linux/module.h>
42 #include <linux/delay.h>
43 #include <linux/irq.h>
44 #include <linux/seq_file.h>
45 #include <linux/root_dev.h>
46
47 #include <asm/mmu.h>
48 #include <asm/processor.h>
49 #include <asm/io.h>
50 #include <asm/pgtable.h>
51 #include <asm/prom.h>
52 #include <asm/rtas.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/iommu.h>
55 #include <asm/dma.h>
56 #include <asm/machdep.h>
57 #include <asm/irq.h>
58 #include <asm/kexec.h>
59 #include <asm/time.h>
60 #include <asm/nvram.h>
61 #include "xics.h"
62 #include <asm/pmc.h>
63 #include <asm/mpic.h>
64 #include <asm/ppc-pci.h>
65 #include <asm/i8259.h>
66 #include <asm/udbg.h>
67 #include <asm/smp.h>
68
69 #include "plpar_wrappers.h"
70 #include "ras.h"
71 #include "firmware.h"
72
73 #ifdef DEBUG
74 #define DBG(fmt...) udbg_printf(fmt)
75 #else
76 #define DBG(fmt...)
77 #endif
78
79 /* move those away to a .h */
80 extern void smp_init_pseries_mpic(void);
81 extern void smp_init_pseries_xics(void);
82 extern void find_udbg_vterm(void);
83
84 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
85
86 static void pseries_shared_idle_sleep(void);
87 static void pseries_dedicated_idle_sleep(void);
88
89 static struct device_node *pSeries_mpic_node;
90
91 static void pSeries_show_cpuinfo(struct seq_file *m)
92 {
93         struct device_node *root;
94         const char *model = "";
95
96         root = of_find_node_by_path("/");
97         if (root)
98                 model = get_property(root, "model", NULL);
99         seq_printf(m, "machine\t\t: CHRP %s\n", model);
100         of_node_put(root);
101 }
102
103 /* Initialize firmware assisted non-maskable interrupts if
104  * the firmware supports this feature.
105  */
106 static void __init fwnmi_init(void)
107 {
108         unsigned long system_reset_addr, machine_check_addr;
109
110         int ibm_nmi_register = rtas_token("ibm,nmi-register");
111         if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
112                 return;
113
114         /* If the kernel's not linked at zero we point the firmware at low
115          * addresses anyway, and use a trampoline to get to the real code. */
116         system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
117         machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
118
119         if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
120                                 machine_check_addr))
121                 fwnmi_active = 1;
122 }
123
124 void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
125 {
126         unsigned int cascade_irq = i8259_irq();
127         if (cascade_irq != NO_IRQ)
128                 generic_handle_irq(cascade_irq);
129         desc->chip->eoi(irq);
130 }
131
132 static void __init pseries_mpic_init_IRQ(void)
133 {
134         struct device_node *np, *old, *cascade = NULL;
135         const unsigned int *addrp;
136         unsigned long intack = 0;
137         const unsigned int *opprop;
138         unsigned long openpic_addr = 0;
139         unsigned int cascade_irq;
140         int naddr, n, i, opplen;
141         struct mpic *mpic;
142
143         np = of_find_node_by_path("/");
144         naddr = prom_n_addr_cells(np);
145         opprop = get_property(np, "platform-open-pic", &opplen);
146         if (opprop != 0) {
147                 openpic_addr = of_read_number(opprop, naddr);
148                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
149         }
150         of_node_put(np);
151
152         BUG_ON(openpic_addr == 0);
153
154         /* Setup the openpic driver */
155         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
156                           MPIC_PRIMARY,
157                           16, 250, /* isu size, irq count */
158                           " MPIC     ");
159         BUG_ON(mpic == NULL);
160
161         /* Add ISUs */
162         opplen /= sizeof(u32);
163         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
164                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
165                 mpic_assign_isu(mpic, n, isuaddr);
166         }
167
168         /* All ISUs are setup, complete initialization */
169         mpic_init(mpic);
170
171         /* Look for cascade */
172         for_each_node_by_type(np, "interrupt-controller")
173                 if (device_is_compatible(np, "chrp,iic")) {
174                         cascade = np;
175                         break;
176                 }
177         if (cascade == NULL)
178                 return;
179
180         cascade_irq = irq_of_parse_and_map(cascade, 0);
181         if (cascade == NO_IRQ) {
182                 printk(KERN_ERR "mpic: failed to map cascade interrupt");
183                 return;
184         }
185
186         /* Check ACK type */
187         for (old = of_node_get(cascade); old != NULL ; old = np) {
188                 np = of_get_parent(old);
189                 of_node_put(old);
190                 if (np == NULL)
191                         break;
192                 if (strcmp(np->name, "pci") != 0)
193                         continue;
194                 addrp = get_property(np, "8259-interrupt-acknowledge",
195                                             NULL);
196                 if (addrp == NULL)
197                         continue;
198                 naddr = prom_n_addr_cells(np);
199                 intack = addrp[naddr-1];
200                 if (naddr > 1)
201                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
202         }
203         if (intack)
204                 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
205                        intack);
206         i8259_init(cascade, intack);
207         of_node_put(cascade);
208         set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
209 }
210
211 static void pseries_lpar_enable_pmcs(void)
212 {
213         unsigned long set, reset;
214
215         set = 1UL << 63;
216         reset = 0;
217         plpar_hcall_norets(H_PERFMON, set, reset);
218
219         /* instruct hypervisor to maintain PMCs */
220         if (firmware_has_feature(FW_FEATURE_SPLPAR))
221                 get_lppaca()->pmcregs_in_use = 1;
222 }
223
224 #ifdef CONFIG_KEXEC
225 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
226 {
227         /* Don't risk a hypervisor call if we're crashing */
228         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
229                 unsigned long addr;
230
231                 addr = __pa(get_slb_shadow());
232                 if (unregister_slb_shadow(hard_smp_processor_id(), addr))
233                         printk("SLB shadow buffer deregistration of "
234                                "cpu %u (hw_cpu_id %d) failed\n",
235                                smp_processor_id(),
236                                hard_smp_processor_id());
237
238                 addr = __pa(get_lppaca());
239                 if (unregister_vpa(hard_smp_processor_id(), addr)) {
240                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
241                                         "failed\n", smp_processor_id(),
242                                         hard_smp_processor_id());
243                 }
244         }
245 }
246
247 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
248 {
249         pseries_kexec_cpu_down(crash_shutdown, secondary);
250         mpic_teardown_this_cpu(secondary);
251 }
252
253 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
254 {
255         pseries_kexec_cpu_down(crash_shutdown, secondary);
256         xics_teardown_cpu(secondary);
257 }
258 #endif /* CONFIG_KEXEC */
259
260 static void __init pseries_discover_pic(void)
261 {
262         struct device_node *np;
263         const char *typep;
264
265         for (np = NULL; (np = of_find_node_by_name(np,
266                                                    "interrupt-controller"));) {
267                 typep = get_property(np, "compatible", NULL);
268                 if (strstr(typep, "open-pic")) {
269                         pSeries_mpic_node = of_node_get(np);
270                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
271                         ppc_md.get_irq        = mpic_get_irq;
272 #ifdef CONFIG_KEXEC
273                         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
274 #endif
275 #ifdef CONFIG_SMP
276                         smp_init_pseries_mpic();
277 #endif
278                         return;
279                 } else if (strstr(typep, "ppc-xicp")) {
280                         ppc_md.init_IRQ       = xics_init_IRQ;
281 #ifdef CONFIG_KEXEC
282                         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
283 #endif
284 #ifdef CONFIG_SMP
285                         smp_init_pseries_xics();
286 #endif
287                         return;
288                 }
289         }
290         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
291                " interrupt-controller\n");
292 }
293
294 static void __init pSeries_setup_arch(void)
295 {
296         /* Discover PIC type and setup ppc_md accordingly */
297         pseries_discover_pic();
298
299         /* openpic global configuration register (64-bit format). */
300         /* openpic Interrupt Source Unit pointer (64-bit format). */
301         /* python0 facility area (mmio) (64-bit format) REAL address. */
302
303         /* init to some ~sane value until calibrate_delay() runs */
304         loops_per_jiffy = 50000000;
305
306         if (ROOT_DEV == 0) {
307                 printk("No ramdisk, default root is /dev/sda2\n");
308                 ROOT_DEV = Root_SDA2;
309         }
310
311         fwnmi_init();
312
313         /* Find and initialize PCI host bridges */
314         init_pci_config_tokens();
315         find_and_init_phbs();
316         eeh_init();
317
318         pSeries_nvram_init();
319
320         /* Choose an idle loop */
321         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
322                 vpa_init(boot_cpuid);
323                 if (get_lppaca()->shared_proc) {
324                         printk(KERN_DEBUG "Using shared processor idle loop\n");
325                         ppc_md.power_save = pseries_shared_idle_sleep;
326                 } else {
327                         printk(KERN_DEBUG "Using dedicated idle loop\n");
328                         ppc_md.power_save = pseries_dedicated_idle_sleep;
329                 }
330         } else {
331                 printk(KERN_DEBUG "Using default idle loop\n");
332         }
333
334         if (firmware_has_feature(FW_FEATURE_LPAR))
335                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
336         else
337                 ppc_md.enable_pmcs = power4_enable_pmcs;
338 }
339
340 static int __init pSeries_init_panel(void)
341 {
342         /* Manually leave the kernel version on the panel. */
343         ppc_md.progress("Linux ppc64\n", 0);
344         ppc_md.progress(init_utsname()->version, 0);
345
346         return 0;
347 }
348 arch_initcall(pSeries_init_panel);
349
350 #ifdef CONFIG_HOTPLUG_CPU
351 static void pSeries_mach_cpu_die(void)
352 {
353         local_irq_disable();
354         idle_task_exit();
355         xics_teardown_cpu(0);
356         rtas_stop_self();
357         /* Should never get here... */
358         BUG();
359         for(;;);
360 }
361 #else
362 #define pSeries_mach_cpu_die NULL
363 #endif
364
365 static int pseries_set_dabr(unsigned long dabr)
366 {
367         return plpar_hcall_norets(H_SET_DABR, dabr);
368 }
369
370 static int pseries_set_xdabr(unsigned long dabr)
371 {
372         /* We want to catch accesses from kernel and userspace */
373         return plpar_hcall_norets(H_SET_XDABR, dabr,
374                         H_DABRX_KERNEL | H_DABRX_USER);
375 }
376
377 /*
378  * Early initialization.  Relocation is on but do not reference unbolted pages
379  */
380 static void __init pSeries_init_early(void)
381 {
382         DBG(" -> pSeries_init_early()\n");
383
384         fw_feature_init();
385
386         if (firmware_has_feature(FW_FEATURE_LPAR))
387                 find_udbg_vterm();
388
389         if (firmware_has_feature(FW_FEATURE_DABR))
390                 ppc_md.set_dabr = pseries_set_dabr;
391         else if (firmware_has_feature(FW_FEATURE_XDABR))
392                 ppc_md.set_dabr = pseries_set_xdabr;
393
394         iommu_init_early_pSeries();
395
396         DBG(" <- pSeries_init_early()\n");
397 }
398
399
400 static int pSeries_check_legacy_ioport(unsigned int baseport)
401 {
402         struct device_node *np;
403
404 #define I8042_DATA_REG  0x60
405 #define FDC_BASE        0x3f0
406
407
408         switch(baseport) {
409         case I8042_DATA_REG:
410                 np = of_find_node_by_type(NULL, "8042");
411                 if (np == NULL)
412                         return -ENODEV;
413                 of_node_put(np);
414                 break;
415         case FDC_BASE:
416                 np = of_find_node_by_type(NULL, "fdc");
417                 if (np == NULL)
418                         return -ENODEV;
419                 of_node_put(np);
420                 break;
421         }
422         return 0;
423 }
424
425 /*
426  * Called very early, MMU is off, device-tree isn't unflattened
427  */
428
429 static int __init pSeries_probe_hypertas(unsigned long node,
430                                          const char *uname, int depth,
431                                          void *data)
432 {
433         if (depth != 1 ||
434             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
435                 return 0;
436
437         if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
438                 powerpc_firmware_features |= FW_FEATURE_LPAR;
439
440         if (firmware_has_feature(FW_FEATURE_LPAR))
441                 hpte_init_lpar();
442         else
443                 hpte_init_native();
444
445         return 1;
446 }
447
448 static int __init pSeries_probe(void)
449 {
450         unsigned long root = of_get_flat_dt_root();
451         char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
452                                           "device_type", NULL);
453         if (dtype == NULL)
454                 return 0;
455         if (strcmp(dtype, "chrp"))
456                 return 0;
457
458         /* Cell blades firmware claims to be chrp while it's not. Until this
459          * is fixed, we need to avoid those here.
460          */
461         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
462             of_flat_dt_is_compatible(root, "IBM,CBEA"))
463                 return 0;
464
465         DBG("pSeries detected, looking for LPAR capability...\n");
466
467         /* Now try to figure out if we are running on LPAR */
468         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
469
470         DBG("Machine is%s LPAR !\n",
471             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
472
473         return 1;
474 }
475
476
477 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
478
479 static void pseries_dedicated_idle_sleep(void)
480
481         unsigned int cpu = smp_processor_id();
482         unsigned long start_snooze;
483
484         /*
485          * Indicate to the HV that we are idle. Now would be
486          * a good time to find other work to dispatch.
487          */
488         get_lppaca()->idle = 1;
489
490         /*
491          * We come in with interrupts disabled, and need_resched()
492          * has been checked recently.  If we should poll for a little
493          * while, do so.
494          */
495         if (__get_cpu_var(smt_snooze_delay)) {
496                 start_snooze = get_tb() +
497                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
498                 local_irq_enable();
499                 set_thread_flag(TIF_POLLING_NRFLAG);
500
501                 while (get_tb() < start_snooze) {
502                         if (need_resched() || cpu_is_offline(cpu))
503                                 goto out;
504                         ppc64_runlatch_off();
505                         HMT_low();
506                         HMT_very_low();
507                 }
508
509                 HMT_medium();
510                 clear_thread_flag(TIF_POLLING_NRFLAG);
511                 smp_mb();
512                 local_irq_disable();
513                 if (need_resched() || cpu_is_offline(cpu))
514                         goto out;
515         }
516
517         cede_processor();
518
519 out:
520         HMT_medium();
521         get_lppaca()->idle = 0;
522 }
523
524 static void pseries_shared_idle_sleep(void)
525 {
526         /*
527          * Indicate to the HV that we are idle. Now would be
528          * a good time to find other work to dispatch.
529          */
530         get_lppaca()->idle = 1;
531
532         /*
533          * Yield the processor to the hypervisor.  We return if
534          * an external interrupt occurs (which are driven prior
535          * to returning here) or if a prod occurs from another
536          * processor. When returning here, external interrupts
537          * are enabled.
538          */
539         cede_processor();
540
541         get_lppaca()->idle = 0;
542 }
543
544 static int pSeries_pci_probe_mode(struct pci_bus *bus)
545 {
546         if (firmware_has_feature(FW_FEATURE_LPAR))
547                 return PCI_PROBE_DEVTREE;
548         return PCI_PROBE_NORMAL;
549 }
550
551 define_machine(pseries) {
552         .name                   = "pSeries",
553         .probe                  = pSeries_probe,
554         .setup_arch             = pSeries_setup_arch,
555         .init_early             = pSeries_init_early,
556         .show_cpuinfo           = pSeries_show_cpuinfo,
557         .log_error              = pSeries_log_error,
558         .pcibios_fixup          = pSeries_final_fixup,
559         .pci_probe_mode         = pSeries_pci_probe_mode,
560         .restart                = rtas_restart,
561         .power_off              = rtas_power_off,
562         .halt                   = rtas_halt,
563         .panic                  = rtas_os_term,
564         .cpu_die                = pSeries_mach_cpu_die,
565         .get_boot_time          = rtas_get_boot_time,
566         .get_rtc_time           = rtas_get_rtc_time,
567         .set_rtc_time           = rtas_set_rtc_time,
568         .calibrate_decr         = generic_calibrate_decr,
569         .progress               = rtas_progress,
570         .check_legacy_ioport    = pSeries_check_legacy_ioport,
571         .system_reset_exception = pSeries_system_reset_exception,
572         .machine_check_exception = pSeries_machine_check_exception,
573 #ifdef CONFIG_KEXEC
574         .machine_kexec          = default_machine_kexec,
575         .machine_kexec_prepare  = default_machine_kexec_prepare,
576         .machine_crash_shutdown = default_machine_crash_shutdown,
577 #endif
578 };