Merge git://git.linux-nfs.org/pub/linux/nfs-2.6
[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/time.h>
59 #include <asm/nvram.h>
60 #include "xics.h"
61 #include <asm/pmc.h>
62 #include <asm/mpic.h>
63 #include <asm/ppc-pci.h>
64 #include <asm/i8259.h>
65 #include <asm/udbg.h>
66 #include <asm/smp.h>
67 #include <asm/firmware.h>
68 #include <asm/eeh.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 = of_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 = of_n_addr_cells(np);
143         opprop = of_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 (of_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_irq == 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 = of_get_property(np, "8259-interrupt-acknowledge",
193                                             NULL);
194                 if (addrp == NULL)
195                         continue;
196                 naddr = of_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 static void __init pseries_discover_pic(void)
223 {
224         struct device_node *np;
225         const char *typep;
226
227         for (np = NULL; (np = of_find_node_by_name(np,
228                                                    "interrupt-controller"));) {
229                 typep = of_get_property(np, "compatible", NULL);
230                 if (strstr(typep, "open-pic")) {
231                         pSeries_mpic_node = of_node_get(np);
232                         ppc_md.init_IRQ       = pseries_mpic_init_IRQ;
233                         ppc_md.get_irq        = mpic_get_irq;
234                         setup_kexec_cpu_down_mpic();
235                         smp_init_pseries_mpic();
236                         return;
237                 } else if (strstr(typep, "ppc-xicp")) {
238                         ppc_md.init_IRQ       = xics_init_IRQ;
239                         setup_kexec_cpu_down_xics();
240                         smp_init_pseries_xics();
241                         return;
242                 }
243         }
244         printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
245                " interrupt-controller\n");
246 }
247
248 static void __init pSeries_setup_arch(void)
249 {
250         /* Discover PIC type and setup ppc_md accordingly */
251         pseries_discover_pic();
252
253         /* openpic global configuration register (64-bit format). */
254         /* openpic Interrupt Source Unit pointer (64-bit format). */
255         /* python0 facility area (mmio) (64-bit format) REAL address. */
256
257         /* init to some ~sane value until calibrate_delay() runs */
258         loops_per_jiffy = 50000000;
259
260         fwnmi_init();
261
262         /* Find and initialize PCI host bridges */
263         init_pci_config_tokens();
264         find_and_init_phbs();
265         eeh_init();
266
267         pSeries_nvram_init();
268
269         /* Choose an idle loop */
270         if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
271                 vpa_init(boot_cpuid);
272                 if (get_lppaca()->shared_proc) {
273                         printk(KERN_DEBUG "Using shared processor idle loop\n");
274                         ppc_md.power_save = pseries_shared_idle_sleep;
275                 } else {
276                         printk(KERN_DEBUG "Using dedicated idle loop\n");
277                         ppc_md.power_save = pseries_dedicated_idle_sleep;
278                 }
279         } else {
280                 printk(KERN_DEBUG "Using default idle loop\n");
281         }
282
283         if (firmware_has_feature(FW_FEATURE_LPAR))
284                 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
285         else
286                 ppc_md.enable_pmcs = power4_enable_pmcs;
287 }
288
289 static int __init pSeries_init_panel(void)
290 {
291         /* Manually leave the kernel version on the panel. */
292         ppc_md.progress("Linux ppc64\n", 0);
293         ppc_md.progress(init_utsname()->version, 0);
294
295         return 0;
296 }
297 arch_initcall(pSeries_init_panel);
298
299 static int pseries_set_dabr(unsigned long dabr)
300 {
301         return plpar_hcall_norets(H_SET_DABR, dabr);
302 }
303
304 static int pseries_set_xdabr(unsigned long dabr)
305 {
306         /* We want to catch accesses from kernel and userspace */
307         return plpar_hcall_norets(H_SET_XDABR, dabr,
308                         H_DABRX_KERNEL | H_DABRX_USER);
309 }
310
311 /*
312  * Early initialization.  Relocation is on but do not reference unbolted pages
313  */
314 static void __init pSeries_init_early(void)
315 {
316         DBG(" -> pSeries_init_early()\n");
317
318         if (firmware_has_feature(FW_FEATURE_LPAR))
319                 find_udbg_vterm();
320
321         if (firmware_has_feature(FW_FEATURE_DABR))
322                 ppc_md.set_dabr = pseries_set_dabr;
323         else if (firmware_has_feature(FW_FEATURE_XDABR))
324                 ppc_md.set_dabr = pseries_set_xdabr;
325
326         iommu_init_early_pSeries();
327
328         DBG(" <- pSeries_init_early()\n");
329 }
330
331 /*
332  * Called very early, MMU is off, device-tree isn't unflattened
333  */
334
335 static int __init pSeries_probe_hypertas(unsigned long node,
336                                          const char *uname, int depth,
337                                          void *data)
338 {
339         const char *hypertas;
340         unsigned long len;
341
342         if (depth != 1 ||
343             (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
344                 return 0;
345
346         hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
347         if (!hypertas)
348                 return 1;
349
350         powerpc_firmware_features |= FW_FEATURE_LPAR;
351         fw_feature_init(hypertas, len);
352
353         return 1;
354 }
355
356 static int __init pSeries_probe(void)
357 {
358         unsigned long root = of_get_flat_dt_root();
359         char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
360
361         if (dtype == NULL)
362                 return 0;
363         if (strcmp(dtype, "chrp"))
364                 return 0;
365
366         /* Cell blades firmware claims to be chrp while it's not. Until this
367          * is fixed, we need to avoid those here.
368          */
369         if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
370             of_flat_dt_is_compatible(root, "IBM,CBEA"))
371                 return 0;
372
373         DBG("pSeries detected, looking for LPAR capability...\n");
374
375         /* Now try to figure out if we are running on LPAR */
376         of_scan_flat_dt(pSeries_probe_hypertas, NULL);
377
378         if (firmware_has_feature(FW_FEATURE_LPAR))
379                 hpte_init_lpar();
380         else
381                 hpte_init_native();
382
383         DBG("Machine is%s LPAR !\n",
384             (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
385
386         return 1;
387 }
388
389
390 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
391
392 static void pseries_dedicated_idle_sleep(void)
393
394         unsigned int cpu = smp_processor_id();
395         unsigned long start_snooze;
396
397         /*
398          * Indicate to the HV that we are idle. Now would be
399          * a good time to find other work to dispatch.
400          */
401         get_lppaca()->idle = 1;
402         get_lppaca()->donate_dedicated_cpu = 1;
403
404         /*
405          * We come in with interrupts disabled, and need_resched()
406          * has been checked recently.  If we should poll for a little
407          * while, do so.
408          */
409         if (__get_cpu_var(smt_snooze_delay)) {
410                 start_snooze = get_tb() +
411                         __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
412                 local_irq_enable();
413                 set_thread_flag(TIF_POLLING_NRFLAG);
414
415                 while (get_tb() < start_snooze) {
416                         if (need_resched() || cpu_is_offline(cpu))
417                                 goto out;
418                         ppc64_runlatch_off();
419                         HMT_low();
420                         HMT_very_low();
421                 }
422
423                 HMT_medium();
424                 clear_thread_flag(TIF_POLLING_NRFLAG);
425                 smp_mb();
426                 local_irq_disable();
427                 if (need_resched() || cpu_is_offline(cpu))
428                         goto out;
429         }
430
431         cede_processor();
432
433 out:
434         HMT_medium();
435         get_lppaca()->donate_dedicated_cpu = 0;
436         get_lppaca()->idle = 0;
437 }
438
439 static void pseries_shared_idle_sleep(void)
440 {
441         /*
442          * Indicate to the HV that we are idle. Now would be
443          * a good time to find other work to dispatch.
444          */
445         get_lppaca()->idle = 1;
446
447         /*
448          * Yield the processor to the hypervisor.  We return if
449          * an external interrupt occurs (which are driven prior
450          * to returning here) or if a prod occurs from another
451          * processor. When returning here, external interrupts
452          * are enabled.
453          */
454         cede_processor();
455
456         get_lppaca()->idle = 0;
457 }
458
459 static int pSeries_pci_probe_mode(struct pci_bus *bus)
460 {
461         if (firmware_has_feature(FW_FEATURE_LPAR))
462                 return PCI_PROBE_DEVTREE;
463         return PCI_PROBE_NORMAL;
464 }
465
466 /**
467  * pSeries_power_off - tell firmware about how to power off the system.
468  *
469  * This function calls either the power-off rtas token in normal cases
470  * or the ibm,power-off-ups token (if present & requested) in case of
471  * a power failure. If power-off token is used, power on will only be
472  * possible with power button press. If ibm,power-off-ups token is used
473  * it will allow auto poweron after power is restored.
474  */
475 void pSeries_power_off(void)
476 {
477         int rc;
478         int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
479
480         if (rtas_flash_term_hook)
481                 rtas_flash_term_hook(SYS_POWER_OFF);
482
483         if (rtas_poweron_auto == 0 ||
484                 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
485                 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
486                 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
487         } else {
488                 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
489                 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
490         }
491         for (;;);
492 }
493
494 #ifndef CONFIG_PCI
495 void pSeries_final_fixup(void) { }
496 #endif
497
498 define_machine(pseries) {
499         .name                   = "pSeries",
500         .probe                  = pSeries_probe,
501         .setup_arch             = pSeries_setup_arch,
502         .init_early             = pSeries_init_early,
503         .show_cpuinfo           = pSeries_show_cpuinfo,
504         .log_error              = pSeries_log_error,
505         .pcibios_fixup          = pSeries_final_fixup,
506         .pci_probe_mode         = pSeries_pci_probe_mode,
507         .restart                = rtas_restart,
508         .power_off              = pSeries_power_off,
509         .halt                   = rtas_halt,
510         .panic                  = rtas_panic_msg,
511         .machine_shutdown       = rtas_os_term,
512         .get_boot_time          = rtas_get_boot_time,
513         .get_rtc_time           = rtas_get_rtc_time,
514         .set_rtc_time           = rtas_set_rtc_time,
515         .calibrate_decr         = generic_calibrate_decr,
516         .progress               = rtas_progress,
517         .system_reset_exception = pSeries_system_reset_exception,
518         .machine_check_exception = pSeries_machine_check_exception,
519 };