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