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 #include <linux/cpu.h>
20 #include <linux/errno.h>
21 #include <linux/sched.h>
22 #include <linux/kernel.h>
23 #include <linux/mm.h>
24 #include <linux/stddef.h>
25 #include <linux/unistd.h>
26 #include <linux/user.h>
27 #include <linux/tty.h>
28 #include <linux/major.h>
29 #include <linux/interrupt.h>
30 #include <linux/reboot.h>
31 #include <linux/init.h>
32 #include <linux/ioport.h>
33 #include <linux/console.h>
34 #include <linux/pci.h>
35 #include <linux/utsname.h>
36 #include <linux/adb.h>
37 #include <linux/export.h>
38 #include <linux/delay.h>
39 #include <linux/irq.h>
40 #include <linux/seq_file.h>
41 #include <linux/root_dev.h>
42 #include <linux/cpuidle.h>
43
44 #include <asm/mmu.h>
45 #include <asm/processor.h>
46 #include <asm/io.h>
47 #include <asm/pgtable.h>
48 #include <asm/prom.h>
49 #include <asm/rtas.h>
50 #include <asm/pci-bridge.h>
51 #include <asm/iommu.h>
52 #include <asm/dma.h>
53 #include <asm/machdep.h>
54 #include <asm/irq.h>
55 #include <asm/time.h>
56 #include <asm/nvram.h>
57 #include <asm/pmc.h>
58 #include <asm/mpic.h>
59 #include <asm/xics.h>
60 #include <asm/ppc-pci.h>
61 #include <asm/i8259.h>
62 #include <asm/udbg.h>
63 #include <asm/smp.h>
64 #include <asm/firmware.h>
65 #include <asm/eeh.h>
66 #include <asm/pSeries_reconfig.h>
67
68 #include "plpar_wrappers.h"
69 #include "pseries.h"
70
71 int CMO_PrPSP = -1;
72 int CMO_SecPSP = -1;
73 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
74 EXPORT_SYMBOL(CMO_PageSize);
75
76 int fwnmi_active; /* TRUE if an FWNMI handler is present */
77
78 static struct device_node *pSeries_mpic_node;
79
pSeries_show_cpuinfo(struct seq_file * m)80 static void pSeries_show_cpuinfo(struct seq_file *m)
81 {
82 struct device_node *root;
83 const char *model = "";
84
85 root = of_find_node_by_path("/");
86 if (root)
87 model = of_get_property(root, "model", NULL);
88 seq_printf(m, "machine\t\t: CHRP %s\n", model);
89 of_node_put(root);
90 }
91
92 /* Initialize firmware assisted non-maskable interrupts if
93 * the firmware supports this feature.
94 */
fwnmi_init(void)95 static void __init fwnmi_init(void)
96 {
97 unsigned long system_reset_addr, machine_check_addr;
98
99 int ibm_nmi_register = rtas_token("ibm,nmi-register");
100 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
101 return;
102
103 /* If the kernel's not linked at zero we point the firmware at low
104 * addresses anyway, and use a trampoline to get to the real code. */
105 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
106 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
107
108 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
109 machine_check_addr))
110 fwnmi_active = 1;
111 }
112
pseries_8259_cascade(unsigned int irq,struct irq_desc * desc)113 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
114 {
115 struct irq_chip *chip = irq_desc_get_chip(desc);
116 unsigned int cascade_irq = i8259_irq();
117
118 if (cascade_irq != NO_IRQ)
119 generic_handle_irq(cascade_irq);
120
121 chip->irq_eoi(&desc->irq_data);
122 }
123
pseries_setup_i8259_cascade(void)124 static void __init pseries_setup_i8259_cascade(void)
125 {
126 struct device_node *np, *old, *found = NULL;
127 unsigned int cascade;
128 const u32 *addrp;
129 unsigned long intack = 0;
130 int naddr;
131
132 for_each_node_by_type(np, "interrupt-controller") {
133 if (of_device_is_compatible(np, "chrp,iic")) {
134 found = np;
135 break;
136 }
137 }
138
139 if (found == NULL) {
140 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
141 return;
142 }
143
144 cascade = irq_of_parse_and_map(found, 0);
145 if (cascade == NO_IRQ) {
146 printk(KERN_ERR "pic: failed to map cascade interrupt");
147 return;
148 }
149 pr_debug("pic: cascade mapped to irq %d\n", cascade);
150
151 for (old = of_node_get(found); old != NULL ; old = np) {
152 np = of_get_parent(old);
153 of_node_put(old);
154 if (np == NULL)
155 break;
156 if (strcmp(np->name, "pci") != 0)
157 continue;
158 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
159 if (addrp == NULL)
160 continue;
161 naddr = of_n_addr_cells(np);
162 intack = addrp[naddr-1];
163 if (naddr > 1)
164 intack |= ((unsigned long)addrp[naddr-2]) << 32;
165 }
166 if (intack)
167 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
168 i8259_init(found, intack);
169 of_node_put(found);
170 irq_set_chained_handler(cascade, pseries_8259_cascade);
171 }
172
pseries_mpic_init_IRQ(void)173 static void __init pseries_mpic_init_IRQ(void)
174 {
175 struct device_node *np;
176 const unsigned int *opprop;
177 unsigned long openpic_addr = 0;
178 int naddr, n, i, opplen;
179 struct mpic *mpic;
180
181 np = of_find_node_by_path("/");
182 naddr = of_n_addr_cells(np);
183 opprop = of_get_property(np, "platform-open-pic", &opplen);
184 if (opprop != 0) {
185 openpic_addr = of_read_number(opprop, naddr);
186 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
187 }
188 of_node_put(np);
189
190 BUG_ON(openpic_addr == 0);
191
192 /* Setup the openpic driver */
193 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
194 MPIC_NO_RESET, 16, 0, " MPIC ");
195 BUG_ON(mpic == NULL);
196
197 /* Add ISUs */
198 opplen /= sizeof(u32);
199 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
200 unsigned long isuaddr = of_read_number(opprop + i, naddr);
201 mpic_assign_isu(mpic, n, isuaddr);
202 }
203
204 /* Setup top-level get_irq */
205 ppc_md.get_irq = mpic_get_irq;
206
207 /* All ISUs are setup, complete initialization */
208 mpic_init(mpic);
209
210 /* Look for cascade */
211 pseries_setup_i8259_cascade();
212 }
213
pseries_xics_init_IRQ(void)214 static void __init pseries_xics_init_IRQ(void)
215 {
216 xics_init();
217 pseries_setup_i8259_cascade();
218 }
219
pseries_lpar_enable_pmcs(void)220 static void pseries_lpar_enable_pmcs(void)
221 {
222 unsigned long set, reset;
223
224 set = 1UL << 63;
225 reset = 0;
226 plpar_hcall_norets(H_PERFMON, set, reset);
227 }
228
pseries_discover_pic(void)229 static void __init pseries_discover_pic(void)
230 {
231 struct device_node *np;
232 const char *typep;
233
234 for (np = NULL; (np = of_find_node_by_name(np,
235 "interrupt-controller"));) {
236 typep = of_get_property(np, "compatible", NULL);
237 if (strstr(typep, "open-pic")) {
238 pSeries_mpic_node = of_node_get(np);
239 ppc_md.init_IRQ = pseries_mpic_init_IRQ;
240 setup_kexec_cpu_down_mpic();
241 smp_init_pseries_mpic();
242 return;
243 } else if (strstr(typep, "ppc-xicp")) {
244 ppc_md.init_IRQ = pseries_xics_init_IRQ;
245 setup_kexec_cpu_down_xics();
246 smp_init_pseries_xics();
247 return;
248 }
249 }
250 printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
251 " interrupt-controller\n");
252 }
253
pci_dn_reconfig_notifier(struct notifier_block * nb,unsigned long action,void * node)254 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *node)
255 {
256 struct device_node *np = node;
257 struct pci_dn *pci = NULL;
258 int err = NOTIFY_OK;
259
260 switch (action) {
261 case PSERIES_RECONFIG_ADD:
262 pci = np->parent->data;
263 if (pci) {
264 update_dn_pci_info(np, pci->phb);
265
266 /* Create EEH device for the OF node */
267 eeh_dev_init(np, pci->phb);
268 }
269 break;
270 default:
271 err = NOTIFY_DONE;
272 break;
273 }
274 return err;
275 }
276
277 static struct notifier_block pci_dn_reconfig_nb = {
278 .notifier_call = pci_dn_reconfig_notifier,
279 };
280
281 struct kmem_cache *dtl_cache;
282
283 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
284 /*
285 * Allocate space for the dispatch trace log for all possible cpus
286 * and register the buffers with the hypervisor. This is used for
287 * computing time stolen by the hypervisor.
288 */
alloc_dispatch_logs(void)289 static int alloc_dispatch_logs(void)
290 {
291 int cpu, ret;
292 struct paca_struct *pp;
293 struct dtl_entry *dtl;
294
295 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
296 return 0;
297
298 if (!dtl_cache)
299 return 0;
300
301 for_each_possible_cpu(cpu) {
302 pp = &paca[cpu];
303 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
304 if (!dtl) {
305 pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
306 cpu);
307 pr_warn("Stolen time statistics will be unreliable\n");
308 break;
309 }
310
311 pp->dtl_ridx = 0;
312 pp->dispatch_log = dtl;
313 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
314 pp->dtl_curr = dtl;
315 }
316
317 /* Register the DTL for the current (boot) cpu */
318 dtl = get_paca()->dispatch_log;
319 get_paca()->dtl_ridx = 0;
320 get_paca()->dtl_curr = dtl;
321 get_paca()->lppaca_ptr->dtl_idx = 0;
322
323 /* hypervisor reads buffer length from this field */
324 dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
325 ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
326 if (ret)
327 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
328 "with %d\n", smp_processor_id(),
329 hard_smp_processor_id(), ret);
330 get_paca()->lppaca_ptr->dtl_enable_mask = 2;
331
332 return 0;
333 }
334 #else /* !CONFIG_VIRT_CPU_ACCOUNTING */
alloc_dispatch_logs(void)335 static inline int alloc_dispatch_logs(void)
336 {
337 return 0;
338 }
339 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
340
alloc_dispatch_log_kmem_cache(void)341 static int alloc_dispatch_log_kmem_cache(void)
342 {
343 dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
344 DISPATCH_LOG_BYTES, 0, NULL);
345 if (!dtl_cache) {
346 pr_warn("Failed to create dispatch trace log buffer cache\n");
347 pr_warn("Stolen time statistics will be unreliable\n");
348 return 0;
349 }
350
351 return alloc_dispatch_logs();
352 }
353 early_initcall(alloc_dispatch_log_kmem_cache);
354
pSeries_idle(void)355 static void pSeries_idle(void)
356 {
357 /* This would call on the cpuidle framework, and the back-end pseries
358 * driver to go to idle states
359 */
360 if (cpuidle_idle_call()) {
361 /* On error, execute default handler
362 * to go into low thread priority and possibly
363 * low power mode.
364 */
365 HMT_low();
366 HMT_very_low();
367 }
368 }
369
pSeries_setup_arch(void)370 static void __init pSeries_setup_arch(void)
371 {
372 panic_timeout = 10;
373
374 /* Discover PIC type and setup ppc_md accordingly */
375 pseries_discover_pic();
376
377 /* openpic global configuration register (64-bit format). */
378 /* openpic Interrupt Source Unit pointer (64-bit format). */
379 /* python0 facility area (mmio) (64-bit format) REAL address. */
380
381 /* init to some ~sane value until calibrate_delay() runs */
382 loops_per_jiffy = 50000000;
383
384 fwnmi_init();
385
386 /* By default, only probe PCI (can be overriden by rtas_pci) */
387 pci_add_flags(PCI_PROBE_ONLY);
388
389 /* Find and initialize PCI host bridges */
390 init_pci_config_tokens();
391 eeh_pseries_init();
392 find_and_init_phbs();
393 pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb);
394 eeh_init();
395
396 pSeries_nvram_init();
397
398 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
399 vpa_init(boot_cpuid);
400 ppc_md.power_save = pSeries_idle;
401 }
402
403 if (firmware_has_feature(FW_FEATURE_LPAR))
404 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
405 else
406 ppc_md.enable_pmcs = power4_enable_pmcs;
407 }
408
pSeries_init_panel(void)409 static int __init pSeries_init_panel(void)
410 {
411 /* Manually leave the kernel version on the panel. */
412 ppc_md.progress("Linux ppc64\n", 0);
413 ppc_md.progress(init_utsname()->version, 0);
414
415 return 0;
416 }
417 machine_arch_initcall(pseries, pSeries_init_panel);
418
pseries_set_dabr(unsigned long dabr)419 static int pseries_set_dabr(unsigned long dabr)
420 {
421 return plpar_hcall_norets(H_SET_DABR, dabr);
422 }
423
pseries_set_xdabr(unsigned long dabr)424 static int pseries_set_xdabr(unsigned long dabr)
425 {
426 /* We want to catch accesses from kernel and userspace */
427 return plpar_hcall_norets(H_SET_XDABR, dabr,
428 H_DABRX_KERNEL | H_DABRX_USER);
429 }
430
431 #define CMO_CHARACTERISTICS_TOKEN 44
432 #define CMO_MAXLENGTH 1026
433
pSeries_coalesce_init(void)434 void pSeries_coalesce_init(void)
435 {
436 struct hvcall_mpp_x_data mpp_x_data;
437
438 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
439 powerpc_firmware_features |= FW_FEATURE_XCMO;
440 else
441 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
442 }
443
444 /**
445 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
446 * handle that here. (Stolen from parse_system_parameter_string)
447 */
pSeries_cmo_feature_init(void)448 void pSeries_cmo_feature_init(void)
449 {
450 char *ptr, *key, *value, *end;
451 int call_status;
452 int page_order = IOMMU_PAGE_SHIFT;
453
454 pr_debug(" -> fw_cmo_feature_init()\n");
455 spin_lock(&rtas_data_buf_lock);
456 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
457 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
458 NULL,
459 CMO_CHARACTERISTICS_TOKEN,
460 __pa(rtas_data_buf),
461 RTAS_DATA_BUF_SIZE);
462
463 if (call_status != 0) {
464 spin_unlock(&rtas_data_buf_lock);
465 pr_debug("CMO not available\n");
466 pr_debug(" <- fw_cmo_feature_init()\n");
467 return;
468 }
469
470 end = rtas_data_buf + CMO_MAXLENGTH - 2;
471 ptr = rtas_data_buf + 2; /* step over strlen value */
472 key = value = ptr;
473
474 while (*ptr && (ptr <= end)) {
475 /* Separate the key and value by replacing '=' with '\0' and
476 * point the value at the string after the '='
477 */
478 if (ptr[0] == '=') {
479 ptr[0] = '\0';
480 value = ptr + 1;
481 } else if (ptr[0] == '\0' || ptr[0] == ',') {
482 /* Terminate the string containing the key/value pair */
483 ptr[0] = '\0';
484
485 if (key == value) {
486 pr_debug("Malformed key/value pair\n");
487 /* Never found a '=', end processing */
488 break;
489 }
490
491 if (0 == strcmp(key, "CMOPageSize"))
492 page_order = simple_strtol(value, NULL, 10);
493 else if (0 == strcmp(key, "PrPSP"))
494 CMO_PrPSP = simple_strtol(value, NULL, 10);
495 else if (0 == strcmp(key, "SecPSP"))
496 CMO_SecPSP = simple_strtol(value, NULL, 10);
497 value = key = ptr + 1;
498 }
499 ptr++;
500 }
501
502 /* Page size is returned as the power of 2 of the page size,
503 * convert to the page size in bytes before returning
504 */
505 CMO_PageSize = 1 << page_order;
506 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
507
508 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
509 pr_info("CMO enabled\n");
510 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
511 CMO_SecPSP);
512 powerpc_firmware_features |= FW_FEATURE_CMO;
513 pSeries_coalesce_init();
514 } else
515 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
516 CMO_SecPSP);
517 spin_unlock(&rtas_data_buf_lock);
518 pr_debug(" <- fw_cmo_feature_init()\n");
519 }
520
521 /*
522 * Early initialization. Relocation is on but do not reference unbolted pages
523 */
pSeries_init_early(void)524 static void __init pSeries_init_early(void)
525 {
526 pr_debug(" -> pSeries_init_early()\n");
527
528 #ifdef CONFIG_HVC_CONSOLE
529 if (firmware_has_feature(FW_FEATURE_LPAR))
530 hvc_vio_init_early();
531 #endif
532 if (firmware_has_feature(FW_FEATURE_DABR))
533 ppc_md.set_dabr = pseries_set_dabr;
534 else if (firmware_has_feature(FW_FEATURE_XDABR))
535 ppc_md.set_dabr = pseries_set_xdabr;
536
537 pSeries_cmo_feature_init();
538 iommu_init_early_pSeries();
539
540 pr_debug(" <- pSeries_init_early()\n");
541 }
542
543 /*
544 * Called very early, MMU is off, device-tree isn't unflattened
545 */
546
pSeries_probe_hypertas(unsigned long node,const char * uname,int depth,void * data)547 static int __init pSeries_probe_hypertas(unsigned long node,
548 const char *uname, int depth,
549 void *data)
550 {
551 const char *hypertas;
552 unsigned long len;
553
554 if (depth != 1 ||
555 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
556 return 0;
557
558 hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
559 if (!hypertas)
560 return 1;
561
562 powerpc_firmware_features |= FW_FEATURE_LPAR;
563 fw_feature_init(hypertas, len);
564
565 return 1;
566 }
567
pSeries_probe(void)568 static int __init pSeries_probe(void)
569 {
570 unsigned long root = of_get_flat_dt_root();
571 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
572
573 if (dtype == NULL)
574 return 0;
575 if (strcmp(dtype, "chrp"))
576 return 0;
577
578 /* Cell blades firmware claims to be chrp while it's not. Until this
579 * is fixed, we need to avoid those here.
580 */
581 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
582 of_flat_dt_is_compatible(root, "IBM,CBEA"))
583 return 0;
584
585 pr_debug("pSeries detected, looking for LPAR capability...\n");
586
587 /* Now try to figure out if we are running on LPAR */
588 of_scan_flat_dt(pSeries_probe_hypertas, NULL);
589
590 if (firmware_has_feature(FW_FEATURE_LPAR))
591 hpte_init_lpar();
592 else
593 hpte_init_native();
594
595 pr_debug("Machine is%s LPAR !\n",
596 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
597
598 return 1;
599 }
600
pSeries_pci_probe_mode(struct pci_bus * bus)601 static int pSeries_pci_probe_mode(struct pci_bus *bus)
602 {
603 if (firmware_has_feature(FW_FEATURE_LPAR))
604 return PCI_PROBE_DEVTREE;
605 return PCI_PROBE_NORMAL;
606 }
607
608 /**
609 * pSeries_power_off - tell firmware about how to power off the system.
610 *
611 * This function calls either the power-off rtas token in normal cases
612 * or the ibm,power-off-ups token (if present & requested) in case of
613 * a power failure. If power-off token is used, power on will only be
614 * possible with power button press. If ibm,power-off-ups token is used
615 * it will allow auto poweron after power is restored.
616 */
pSeries_power_off(void)617 static void pSeries_power_off(void)
618 {
619 int rc;
620 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
621
622 if (rtas_flash_term_hook)
623 rtas_flash_term_hook(SYS_POWER_OFF);
624
625 if (rtas_poweron_auto == 0 ||
626 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
627 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
628 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
629 } else {
630 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
631 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
632 }
633 for (;;);
634 }
635
636 #ifndef CONFIG_PCI
pSeries_final_fixup(void)637 void pSeries_final_fixup(void) { }
638 #endif
639
define_machine(pseries)640 define_machine(pseries) {
641 .name = "pSeries",
642 .probe = pSeries_probe,
643 .setup_arch = pSeries_setup_arch,
644 .init_early = pSeries_init_early,
645 .show_cpuinfo = pSeries_show_cpuinfo,
646 .log_error = pSeries_log_error,
647 .pcibios_fixup = pSeries_final_fixup,
648 .pci_probe_mode = pSeries_pci_probe_mode,
649 .restart = rtas_restart,
650 .power_off = pSeries_power_off,
651 .halt = rtas_halt,
652 .panic = rtas_os_term,
653 .get_boot_time = rtas_get_boot_time,
654 .get_rtc_time = rtas_get_rtc_time,
655 .set_rtc_time = rtas_set_rtc_time,
656 .calibrate_decr = generic_calibrate_decr,
657 .progress = rtas_progress,
658 .system_reset_exception = pSeries_system_reset_exception,
659 .machine_check_exception = pSeries_machine_check_exception,
660 };
661