43dbf737698ce458efccc8c4dd03e868ff8e7bfc
[sfrench/cifs-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
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                           struct pt_regs *regs)
126 {
127         unsigned int cascade_irq = i8259_irq(regs);
128         if (cascade_irq != NO_IRQ)
129                 generic_handle_irq(cascade_irq, regs);
130         desc->chip->eoi(irq);
131 }
132
133 static void __init pseries_mpic_init_IRQ(void)
134 {
135         struct device_node *np, *old, *cascade = NULL;
136         const unsigned int *addrp;
137         unsigned long intack = 0;
138         const unsigned int *opprop;
139         unsigned long openpic_addr = 0;
140         unsigned int cascade_irq;
141         int naddr, n, i, opplen;
142         struct mpic *mpic;
143
144         np = of_find_node_by_path("/");
145         naddr = prom_n_addr_cells(np);
146         opprop = get_property(np, "platform-open-pic", &opplen);
147         if (opprop != 0) {
148                 openpic_addr = of_read_number(opprop, naddr);
149                 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
150         }
151         of_node_put(np);
152
153         BUG_ON(openpic_addr == 0);
154
155         /* Setup the openpic driver */
156         mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
157                           MPIC_PRIMARY,
158                           16, 250, /* isu size, irq count */
159                           " MPIC     ");
160         BUG_ON(mpic == NULL);
161
162         /* Add ISUs */
163         opplen /= sizeof(u32);
164         for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
165                 unsigned long isuaddr = of_read_number(opprop + i, naddr);
166                 mpic_assign_isu(mpic, n, isuaddr);
167         }
168
169         /* All ISUs are setup, complete initialization */
170         mpic_init(mpic);
171
172         /* Look for cascade */
173         for_each_node_by_type(np, "interrupt-controller")
174                 if (device_is_compatible(np, "chrp,iic")) {
175                         cascade = np;
176                         break;
177                 }
178         if (cascade == NULL)
179                 return;
180
181         cascade_irq = irq_of_parse_and_map(cascade, 0);
182         if (cascade == NO_IRQ) {
183                 printk(KERN_ERR "xics: failed to map cascade interrupt");
184                 return;
185         }
186
187         /* Check ACK type */
188         for (old = of_node_get(cascade); old != NULL ; old = np) {
189                 np = of_get_parent(old);
190                 of_node_put(old);
191                 if (np == NULL)
192                         break;
193                 if (strcmp(np->name, "pci") != 0)
194                         continue;
195                 addrp = get_property(np, "8259-interrupt-acknowledge",
196                                             NULL);
197                 if (addrp == NULL)
198                         continue;
199                 naddr = prom_n_addr_cells(np);
200                 intack = addrp[naddr-1];
201                 if (naddr > 1)
202                         intack |= ((unsigned long)addrp[naddr-2]) << 32;
203         }
204         if (intack)
205                 printk(KERN_DEBUG "mpic: PCI 8259 intack at 0x%016lx\n",
206                        intack);
207         i8259_init(cascade, intack);
208         of_node_put(cascade);
209         set_irq_chained_handler(cascade_irq, pseries_8259_cascade);
210 }
211
212 static void pseries_lpar_enable_pmcs(void)
213 {
214         unsigned long set, reset;
215
216         set = 1UL << 63;
217         reset = 0;
218         plpar_hcall_norets(H_PERFMON, set, reset);
219
220         /* instruct hypervisor to maintain PMCs */
221         if (firmware_has_feature(FW_FEATURE_SPLPAR))
222                 get_lppaca()->pmcregs_in_use = 1;
223 }
224
225 #ifdef CONFIG_KEXEC
226 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
227 {
228         /* Don't risk a hypervisor call if we're crashing */
229         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
230                 unsigned long addr;
231
232                 addr = __pa(get_slb_shadow());
233                 if (unregister_slb_shadow(hard_smp_processor_id(), addr))
234                         printk("SLB shadow buffer deregistration of "
235                                "cpu %u (hw_cpu_id %d) failed\n",
236                                smp_processor_id(),
237                                hard_smp_processor_id());
238
239                 addr = __pa(get_lppaca());
240                 if (unregister_vpa(hard_smp_processor_id(), addr)) {
241                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
242                                         "failed\n", smp_processor_id(),
243                                         hard_smp_processor_id());
244                 }
245         }
246 }
247
248 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
249 {
250         pseries_kexec_cpu_down(crash_shutdown, secondary);
251         mpic_teardown_this_cpu(secondary);
252 }
253
254 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
255 {
256         pseries_kexec_cpu_down(crash_shutdown, secondary);
257         xics_teardown_cpu(secondary);
258 }
259 #endif /* CONFIG_KEXEC */
260
261 static void __init pseries_discover_pic(void)
262 {
263         struct device_node *np;
264         const char *typep;
265
266         for (np = NULL; (np = of_find_node_by_name(np,
267                                                    "interrupt-controller"));) {
268                 typep = get_property(np, "compatible", NULL);
269                 if (strstr(typep, "open-pic")) {
270                         pSeries_mpic_node = of_node_get(np);
271                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
272                         ppc_md.get_irq        = mpic_get_irq;
273 #ifdef CONFIG_KEXEC
274                         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
275 #endif
276 #ifdef CONFIG_SMP
277                         smp_init_pseries_mpic();
278 #endif
279                         return;
280                 } else if (strstr(typep, "ppc-xicp")) {
281                         ppc_md.init_IRQ       = xics_init_IRQ;
282 #ifdef CONFIG_KEXEC
283                         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
284 #endif
285 #ifdef CONFIG_SMP
286                         smp_init_pseries_xics();
287 #endif
288                         return;
289                 }
290         }
291         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
292                " interrupt-controller\n");
293 }
294
295 static void __init pSeries_setup_arch(void)
296 {
297         /* Discover PIC type and setup ppc_md accordingly */
298         pseries_discover_pic();
299
300         /* openpic global configuration register (64-bit format). */
301         /* openpic Interrupt Source Unit pointer (64-bit format). */
302         /* python0 facility area (mmio) (64-bit format) REAL address. */
303
304         /* init to some ~sane value until calibrate_delay() runs */
305         loops_per_jiffy = 50000000;
306
307         if (ROOT_DEV == 0) {
308                 printk("No ramdisk, default root is /dev/sda2\n");
309                 ROOT_DEV = Root_SDA2;
310         }
311
312         fwnmi_init();
313
314         /* Find and initialize PCI host bridges */
315         init_pci_config_tokens();
316         find_and_init_phbs();
317         eeh_init();
318
319         pSeries_nvram_init();
320
321         /* Choose an idle loop */
322         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
323                 vpa_init(boot_cpuid);
324                 if (get_lppaca()->shared_proc) {
325                         printk(KERN_DEBUG "Using shared processor idle loop\n");
326                         ppc_md.power_save = pseries_shared_idle_sleep;
327                 } else {
328                         printk(KERN_DEBUG "Using dedicated idle loop\n");
329                         ppc_md.power_save = pseries_dedicated_idle_sleep;
330                 }
331         } else {
332                 printk(KERN_DEBUG "Using default idle loop\n");
333         }
334
335         if (firmware_has_feature(FW_FEATURE_LPAR))
336                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
337         else
338                 ppc_md.enable_pmcs = power4_enable_pmcs;
339 }
340
341 static int __init pSeries_init_panel(void)
342 {
343         /* Manually leave the kernel version on the panel. */
344         ppc_md.progress("Linux ppc64\n", 0);
345         ppc_md.progress(init_utsname()->version, 0);
346
347         return 0;
348 }
349 arch_initcall(pSeries_init_panel);
350
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
362 static int pseries_set_dabr(unsigned long dabr)
363 {
364         return plpar_hcall_norets(H_SET_DABR, dabr);
365 }
366
367 static int pseries_set_xdabr(unsigned long dabr)
368 {
369         /* We want to catch accesses from kernel and userspace */
370         return plpar_hcall_norets(H_SET_XDABR, dabr,
371                         H_DABRX_KERNEL | H_DABRX_USER);
372 }
373
374 /*
375  * Early initialization.  Relocation is on but do not reference unbolted pages
376  */
377 static void __init pSeries_init_early(void)
378 {
379         DBG(" -> pSeries_init_early()\n");
380
381         fw_feature_init();
382
383         if (firmware_has_feature(FW_FEATURE_LPAR))
384                 find_udbg_vterm();
385
386         if (firmware_has_feature(FW_FEATURE_DABR))
387                 ppc_md.set_dabr = pseries_set_dabr;
388         else if (firmware_has_feature(FW_FEATURE_XDABR))
389                 ppc_md.set_dabr = pseries_set_xdabr;
390
391         iommu_init_early_pSeries();
392
393         DBG(" <- pSeries_init_early()\n");
394 }
395
396
397 static int pSeries_check_legacy_ioport(unsigned int baseport)
398 {
399         struct device_node *np;
400
401 #define I8042_DATA_REG  0x60
402 #define FDC_BASE        0x3f0
403
404
405         switch(baseport) {
406         case I8042_DATA_REG:
407                 np = of_find_node_by_type(NULL, "8042");
408                 if (np == NULL)
409                         return -ENODEV;
410                 of_node_put(np);
411                 break;
412         case FDC_BASE:
413                 np = of_find_node_by_type(NULL, "fdc");
414                 if (np == NULL)
415                         return -ENODEV;
416                 of_node_put(np);
417                 break;
418         }
419         return 0;
420 }
421
422 /*
423  * Called very early, MMU is off, device-tree isn't unflattened
424  */
425
426 static int __init pSeries_probe_hypertas(unsigned long node,
427                                          const char *uname, int depth,
428                                          void *data)
429 {
430         if (depth != 1 ||
431             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
432                 return 0;
433
434         if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL) != NULL)
435                 powerpc_firmware_features |= FW_FEATURE_LPAR;
436
437         if (firmware_has_feature(FW_FEATURE_LPAR))
438                 hpte_init_lpar();
439         else
440                 hpte_init_native();
441
442         return 1;
443 }
444
445 static int __init pSeries_probe(void)
446 {
447         unsigned long root = of_get_flat_dt_root();
448         char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
449                                           "device_type", NULL);
450         if (dtype == NULL)
451                 return 0;
452         if (strcmp(dtype, "chrp"))
453                 return 0;
454
455         /* Cell blades firmware claims to be chrp while it's not. Until this
456          * is fixed, we need to avoid those here.
457          */
458         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
459             of_flat_dt_is_compatible(root, "IBM,CBEA"))
460                 return 0;
461
462         DBG("pSeries detected, looking for LPAR capability...\n");
463
464         /* Now try to figure out if we are running on LPAR */
465         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
466
467         DBG("Machine is%s LPAR !\n",
468             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
469
470         return 1;
471 }
472
473
474 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
475
476 static void pseries_dedicated_idle_sleep(void)
477
478         unsigned int cpu = smp_processor_id();
479         unsigned long start_snooze;
480
481         /*
482          * Indicate to the HV that we are idle. Now would be
483          * a good time to find other work to dispatch.
484          */
485         get_lppaca()->idle = 1;
486
487         /*
488          * We come in with interrupts disabled, and need_resched()
489          * has been checked recently.  If we should poll for a little
490          * while, do so.
491          */
492         if (__get_cpu_var(smt_snooze_delay)) {
493                 start_snooze = get_tb() +
494                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
495                 local_irq_enable();
496                 set_thread_flag(TIF_POLLING_NRFLAG);
497
498                 while (get_tb() < start_snooze) {
499                         if (need_resched() || cpu_is_offline(cpu))
500                                 goto out;
501                         ppc64_runlatch_off();
502                         HMT_low();
503                         HMT_very_low();
504                 }
505
506                 HMT_medium();
507                 clear_thread_flag(TIF_POLLING_NRFLAG);
508                 smp_mb();
509                 local_irq_disable();
510                 if (need_resched() || cpu_is_offline(cpu))
511                         goto out;
512         }
513
514         cede_processor();
515
516 out:
517         HMT_medium();
518         get_lppaca()->idle = 0;
519 }
520
521 static void pseries_shared_idle_sleep(void)
522 {
523         /*
524          * Indicate to the HV that we are idle. Now would be
525          * a good time to find other work to dispatch.
526          */
527         get_lppaca()->idle = 1;
528
529         /*
530          * Yield the processor to the hypervisor.  We return if
531          * an external interrupt occurs (which are driven prior
532          * to returning here) or if a prod occurs from another
533          * processor. When returning here, external interrupts
534          * are enabled.
535          */
536         cede_processor();
537
538         get_lppaca()->idle = 0;
539 }
540
541 static int pSeries_pci_probe_mode(struct pci_bus *bus)
542 {
543         if (firmware_has_feature(FW_FEATURE_LPAR))
544                 return PCI_PROBE_DEVTREE;
545         return PCI_PROBE_NORMAL;
546 }
547
548 define_machine(pseries) {
549         .name                   = "pSeries",
550         .probe                  = pSeries_probe,
551         .setup_arch             = pSeries_setup_arch,
552         .init_early             = pSeries_init_early,
553         .show_cpuinfo           = pSeries_show_cpuinfo,
554         .log_error              = pSeries_log_error,
555         .pcibios_fixup          = pSeries_final_fixup,
556         .pci_probe_mode         = pSeries_pci_probe_mode,
557         .irq_bus_setup          = pSeries_irq_bus_setup,
558         .restart                = rtas_restart,
559         .power_off              = rtas_power_off,
560         .halt                   = rtas_halt,
561         .panic                  = rtas_os_term,
562         .cpu_die                = pSeries_mach_cpu_die,
563         .get_boot_time          = rtas_get_boot_time,
564         .get_rtc_time           = rtas_get_rtc_time,
565         .set_rtc_time           = rtas_set_rtc_time,
566         .calibrate_decr         = generic_calibrate_decr,
567         .progress               = rtas_progress,
568         .check_legacy_ioport    = pSeries_check_legacy_ioport,
569         .system_reset_exception = pSeries_system_reset_exception,
570         .machine_check_exception = pSeries_machine_check_exception,
571 #ifdef CONFIG_KEXEC
572         .machine_kexec          = default_machine_kexec,
573         .machine_kexec_prepare  = default_machine_kexec_prepare,
574         .machine_crash_shutdown = default_machine_crash_shutdown,
575 #endif
576 };