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/slab.h>
27 #include <linux/user.h>
28 #include <linux/tty.h>
29 #include <linux/major.h>
30 #include <linux/interrupt.h>
31 #include <linux/reboot.h>
32 #include <linux/init.h>
33 #include <linux/ioport.h>
34 #include <linux/console.h>
35 #include <linux/pci.h>
36 #include <linux/utsname.h>
37 #include <linux/adb.h>
38 #include <linux/module.h>
39 #include <linux/delay.h>
40 #include <linux/irq.h>
41 #include <linux/seq_file.h>
42 #include <linux/root_dev.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 "xics.h"
58 #include <asm/pmc.h>
59 #include <asm/mpic.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
67 #include "plpar_wrappers.h"
68 #include "pseries.h"
69
70 int CMO_PrPSP = -1;
71 int CMO_SecPSP = -1;
72 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
73 EXPORT_SYMBOL(CMO_PageSize);
74
75 int fwnmi_active; /* TRUE if an FWNMI handler is present */
76
77 static void pseries_shared_idle_sleep(void);
78 static void pseries_dedicated_idle_sleep(void);
79
80 static struct device_node *pSeries_mpic_node;
81
pSeries_show_cpuinfo(struct seq_file * m)82 static void pSeries_show_cpuinfo(struct seq_file *m)
83 {
84 struct device_node *root;
85 const char *model = "";
86
87 root = of_find_node_by_path("/");
88 if (root)
89 model = of_get_property(root, "model", NULL);
90 seq_printf(m, "machine\t\t: CHRP %s\n", model);
91 of_node_put(root);
92 }
93
94 /* Initialize firmware assisted non-maskable interrupts if
95 * the firmware supports this feature.
96 */
fwnmi_init(void)97 static void __init fwnmi_init(void)
98 {
99 unsigned long system_reset_addr, machine_check_addr;
100
101 int ibm_nmi_register = rtas_token("ibm,nmi-register");
102 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
103 return;
104
105 /* If the kernel's not linked at zero we point the firmware at low
106 * addresses anyway, and use a trampoline to get to the real code. */
107 system_reset_addr = __pa(system_reset_fwnmi) - PHYSICAL_START;
108 machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
109
110 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
111 machine_check_addr))
112 fwnmi_active = 1;
113 }
114
pseries_8259_cascade(unsigned int irq,struct irq_desc * desc)115 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
116 {
117 unsigned int cascade_irq = i8259_irq();
118 if (cascade_irq != NO_IRQ)
119 generic_handle_irq(cascade_irq);
120 desc->chip->eoi(irq);
121 }
122
pseries_setup_i8259_cascade(void)123 static void __init pseries_setup_i8259_cascade(void)
124 {
125 struct device_node *np, *old, *found = NULL;
126 unsigned int cascade;
127 const u32 *addrp;
128 unsigned long intack = 0;
129 int naddr;
130
131 for_each_node_by_type(np, "interrupt-controller") {
132 if (of_device_is_compatible(np, "chrp,iic")) {
133 found = np;
134 break;
135 }
136 }
137
138 if (found == NULL) {
139 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
140 return;
141 }
142
143 cascade = irq_of_parse_and_map(found, 0);
144 if (cascade == NO_IRQ) {
145 printk(KERN_ERR "pic: failed to map cascade interrupt");
146 return;
147 }
148 pr_debug("pic: cascade mapped to irq %d\n", cascade);
149
150 for (old = of_node_get(found); old != NULL ; old = np) {
151 np = of_get_parent(old);
152 of_node_put(old);
153 if (np == NULL)
154 break;
155 if (strcmp(np->name, "pci") != 0)
156 continue;
157 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
158 if (addrp == NULL)
159 continue;
160 naddr = of_n_addr_cells(np);
161 intack = addrp[naddr-1];
162 if (naddr > 1)
163 intack |= ((unsigned long)addrp[naddr-2]) << 32;
164 }
165 if (intack)
166 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
167 i8259_init(found, intack);
168 of_node_put(found);
169 set_irq_chained_handler(cascade, pseries_8259_cascade);
170 }
171
pseries_mpic_init_IRQ(void)172 static void __init pseries_mpic_init_IRQ(void)
173 {
174 struct device_node *np;
175 const unsigned int *opprop;
176 unsigned long openpic_addr = 0;
177 int naddr, n, i, opplen;
178 struct mpic *mpic;
179
180 np = of_find_node_by_path("/");
181 naddr = of_n_addr_cells(np);
182 opprop = of_get_property(np, "platform-open-pic", &opplen);
183 if (opprop != 0) {
184 openpic_addr = of_read_number(opprop, naddr);
185 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
186 }
187 of_node_put(np);
188
189 BUG_ON(openpic_addr == 0);
190
191 /* Setup the openpic driver */
192 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
193 MPIC_PRIMARY,
194 16, 250, /* isu size, irq count */
195 " MPIC ");
196 BUG_ON(mpic == NULL);
197
198 /* Add ISUs */
199 opplen /= sizeof(u32);
200 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
201 unsigned long isuaddr = of_read_number(opprop + i, naddr);
202 mpic_assign_isu(mpic, n, isuaddr);
203 }
204
205 /* All ISUs are setup, complete initialization */
206 mpic_init(mpic);
207
208 /* Look for cascade */
209 pseries_setup_i8259_cascade();
210 }
211
pseries_xics_init_IRQ(void)212 static void __init pseries_xics_init_IRQ(void)
213 {
214 xics_init_IRQ();
215 pseries_setup_i8259_cascade();
216 }
217
pseries_lpar_enable_pmcs(void)218 static void pseries_lpar_enable_pmcs(void)
219 {
220 unsigned long set, reset;
221
222 set = 1UL << 63;
223 reset = 0;
224 plpar_hcall_norets(H_PERFMON, set, reset);
225
226 /* instruct hypervisor to maintain PMCs */
227 if (firmware_has_feature(FW_FEATURE_SPLPAR))
228 get_lppaca()->pmcregs_in_use = 1;
229 }
230
pseries_discover_pic(void)231 static void __init pseries_discover_pic(void)
232 {
233 struct device_node *np;
234 const char *typep;
235
236 for (np = NULL; (np = of_find_node_by_name(np,
237 "interrupt-controller"));) {
238 typep = of_get_property(np, "compatible", NULL);
239 if (strstr(typep, "open-pic")) {
240 pSeries_mpic_node = of_node_get(np);
241 ppc_md.init_IRQ = pseries_mpic_init_IRQ;
242 ppc_md.get_irq = mpic_get_irq;
243 setup_kexec_cpu_down_mpic();
244 smp_init_pseries_mpic();
245 return;
246 } else if (strstr(typep, "ppc-xicp")) {
247 ppc_md.init_IRQ = pseries_xics_init_IRQ;
248 setup_kexec_cpu_down_xics();
249 smp_init_pseries_xics();
250 return;
251 }
252 }
253 printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
254 " interrupt-controller\n");
255 }
256
pSeries_setup_arch(void)257 static void __init pSeries_setup_arch(void)
258 {
259 /* Discover PIC type and setup ppc_md accordingly */
260 pseries_discover_pic();
261
262 /* openpic global configuration register (64-bit format). */
263 /* openpic Interrupt Source Unit pointer (64-bit format). */
264 /* python0 facility area (mmio) (64-bit format) REAL address. */
265
266 /* init to some ~sane value until calibrate_delay() runs */
267 loops_per_jiffy = 50000000;
268
269 fwnmi_init();
270
271 /* Find and initialize PCI host bridges */
272 init_pci_config_tokens();
273 find_and_init_phbs();
274 eeh_init();
275
276 pSeries_nvram_init();
277
278 /* Choose an idle loop */
279 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
280 vpa_init(boot_cpuid);
281 if (get_lppaca()->shared_proc) {
282 printk(KERN_DEBUG "Using shared processor idle loop\n");
283 ppc_md.power_save = pseries_shared_idle_sleep;
284 } else {
285 printk(KERN_DEBUG "Using dedicated idle loop\n");
286 ppc_md.power_save = pseries_dedicated_idle_sleep;
287 }
288 } else {
289 printk(KERN_DEBUG "Using default idle loop\n");
290 }
291
292 if (firmware_has_feature(FW_FEATURE_LPAR))
293 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
294 else
295 ppc_md.enable_pmcs = power4_enable_pmcs;
296 }
297
pSeries_init_panel(void)298 static int __init pSeries_init_panel(void)
299 {
300 /* Manually leave the kernel version on the panel. */
301 ppc_md.progress("Linux ppc64\n", 0);
302 ppc_md.progress(init_utsname()->version, 0);
303
304 return 0;
305 }
306 arch_initcall(pSeries_init_panel);
307
pseries_set_dabr(unsigned long dabr)308 static int pseries_set_dabr(unsigned long dabr)
309 {
310 return plpar_hcall_norets(H_SET_DABR, dabr);
311 }
312
pseries_set_xdabr(unsigned long dabr)313 static int pseries_set_xdabr(unsigned long dabr)
314 {
315 /* We want to catch accesses from kernel and userspace */
316 return plpar_hcall_norets(H_SET_XDABR, dabr,
317 H_DABRX_KERNEL | H_DABRX_USER);
318 }
319
320 #define CMO_CHARACTERISTICS_TOKEN 44
321 #define CMO_MAXLENGTH 1026
322
323 /**
324 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
325 * handle that here. (Stolen from parse_system_parameter_string)
326 */
pSeries_cmo_feature_init(void)327 void pSeries_cmo_feature_init(void)
328 {
329 char *ptr, *key, *value, *end;
330 int call_status;
331 int page_order = IOMMU_PAGE_SHIFT;
332
333 pr_debug(" -> fw_cmo_feature_init()\n");
334 spin_lock(&rtas_data_buf_lock);
335 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
336 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
337 NULL,
338 CMO_CHARACTERISTICS_TOKEN,
339 __pa(rtas_data_buf),
340 RTAS_DATA_BUF_SIZE);
341
342 if (call_status != 0) {
343 spin_unlock(&rtas_data_buf_lock);
344 pr_debug("CMO not available\n");
345 pr_debug(" <- fw_cmo_feature_init()\n");
346 return;
347 }
348
349 end = rtas_data_buf + CMO_MAXLENGTH - 2;
350 ptr = rtas_data_buf + 2; /* step over strlen value */
351 key = value = ptr;
352
353 while (*ptr && (ptr <= end)) {
354 /* Separate the key and value by replacing '=' with '\0' and
355 * point the value at the string after the '='
356 */
357 if (ptr[0] == '=') {
358 ptr[0] = '\0';
359 value = ptr + 1;
360 } else if (ptr[0] == '\0' || ptr[0] == ',') {
361 /* Terminate the string containing the key/value pair */
362 ptr[0] = '\0';
363
364 if (key == value) {
365 pr_debug("Malformed key/value pair\n");
366 /* Never found a '=', end processing */
367 break;
368 }
369
370 if (0 == strcmp(key, "CMOPageSize"))
371 page_order = simple_strtol(value, NULL, 10);
372 else if (0 == strcmp(key, "PrPSP"))
373 CMO_PrPSP = simple_strtol(value, NULL, 10);
374 else if (0 == strcmp(key, "SecPSP"))
375 CMO_SecPSP = simple_strtol(value, NULL, 10);
376 value = key = ptr + 1;
377 }
378 ptr++;
379 }
380
381 /* Page size is returned as the power of 2 of the page size,
382 * convert to the page size in bytes before returning
383 */
384 CMO_PageSize = 1 << page_order;
385 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
386
387 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
388 pr_info("CMO enabled\n");
389 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
390 CMO_SecPSP);
391 powerpc_firmware_features |= FW_FEATURE_CMO;
392 } else
393 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
394 CMO_SecPSP);
395 spin_unlock(&rtas_data_buf_lock);
396 pr_debug(" <- fw_cmo_feature_init()\n");
397 }
398
399 /*
400 * Early initialization. Relocation is on but do not reference unbolted pages
401 */
pSeries_init_early(void)402 static void __init pSeries_init_early(void)
403 {
404 pr_debug(" -> pSeries_init_early()\n");
405
406 if (firmware_has_feature(FW_FEATURE_LPAR))
407 find_udbg_vterm();
408
409 if (firmware_has_feature(FW_FEATURE_DABR))
410 ppc_md.set_dabr = pseries_set_dabr;
411 else if (firmware_has_feature(FW_FEATURE_XDABR))
412 ppc_md.set_dabr = pseries_set_xdabr;
413
414 pSeries_cmo_feature_init();
415 iommu_init_early_pSeries();
416
417 pr_debug(" <- pSeries_init_early()\n");
418 }
419
420 /*
421 * Called very early, MMU is off, device-tree isn't unflattened
422 */
423
pSeries_probe_hypertas(unsigned long node,const char * uname,int depth,void * data)424 static int __init pSeries_probe_hypertas(unsigned long node,
425 const char *uname, int depth,
426 void *data)
427 {
428 const char *hypertas;
429 unsigned long len;
430
431 if (depth != 1 ||
432 (strcmp(uname, "rtas") != 0 && strcmp(uname, "rtas@0") != 0))
433 return 0;
434
435 hypertas = of_get_flat_dt_prop(node, "ibm,hypertas-functions", &len);
436 if (!hypertas)
437 return 1;
438
439 powerpc_firmware_features |= FW_FEATURE_LPAR;
440 fw_feature_init(hypertas, len);
441
442 return 1;
443 }
444
pSeries_probe(void)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(root, "device_type", NULL);
449
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 pr_debug("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 if (firmware_has_feature(FW_FEATURE_LPAR))
468 hpte_init_lpar();
469 else
470 hpte_init_native();
471
472 pr_debug("Machine is%s LPAR !\n",
473 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
474
475 return 1;
476 }
477
478
479 DECLARE_PER_CPU(unsigned long, smt_snooze_delay);
480
pseries_dedicated_idle_sleep(void)481 static void pseries_dedicated_idle_sleep(void)
482 {
483 unsigned int cpu = smp_processor_id();
484 unsigned long start_snooze;
485 unsigned long in_purr, out_purr;
486
487 /*
488 * Indicate to the HV that we are idle. Now would be
489 * a good time to find other work to dispatch.
490 */
491 get_lppaca()->idle = 1;
492 get_lppaca()->donate_dedicated_cpu = 1;
493 in_purr = mfspr(SPRN_PURR);
494
495 /*
496 * We come in with interrupts disabled, and need_resched()
497 * has been checked recently. If we should poll for a little
498 * while, do so.
499 */
500 if (__get_cpu_var(smt_snooze_delay)) {
501 start_snooze = get_tb() +
502 __get_cpu_var(smt_snooze_delay) * tb_ticks_per_usec;
503 local_irq_enable();
504 set_thread_flag(TIF_POLLING_NRFLAG);
505
506 while (get_tb() < start_snooze) {
507 if (need_resched() || cpu_is_offline(cpu))
508 goto out;
509 ppc64_runlatch_off();
510 HMT_low();
511 HMT_very_low();
512 }
513
514 HMT_medium();
515 clear_thread_flag(TIF_POLLING_NRFLAG);
516 smp_mb();
517 local_irq_disable();
518 if (need_resched() || cpu_is_offline(cpu))
519 goto out;
520 }
521
522 cede_processor();
523
524 out:
525 HMT_medium();
526 out_purr = mfspr(SPRN_PURR);
527 get_lppaca()->wait_state_cycles += out_purr - in_purr;
528 get_lppaca()->donate_dedicated_cpu = 0;
529 get_lppaca()->idle = 0;
530 }
531
pseries_shared_idle_sleep(void)532 static void pseries_shared_idle_sleep(void)
533 {
534 /*
535 * Indicate to the HV that we are idle. Now would be
536 * a good time to find other work to dispatch.
537 */
538 get_lppaca()->idle = 1;
539
540 /*
541 * Yield the processor to the hypervisor. We return if
542 * an external interrupt occurs (which are driven prior
543 * to returning here) or if a prod occurs from another
544 * processor. When returning here, external interrupts
545 * are enabled.
546 */
547 cede_processor();
548
549 get_lppaca()->idle = 0;
550 }
551
pSeries_pci_probe_mode(struct pci_bus * bus)552 static int pSeries_pci_probe_mode(struct pci_bus *bus)
553 {
554 if (firmware_has_feature(FW_FEATURE_LPAR))
555 return PCI_PROBE_DEVTREE;
556 return PCI_PROBE_NORMAL;
557 }
558
559 /**
560 * pSeries_power_off - tell firmware about how to power off the system.
561 *
562 * This function calls either the power-off rtas token in normal cases
563 * or the ibm,power-off-ups token (if present & requested) in case of
564 * a power failure. If power-off token is used, power on will only be
565 * possible with power button press. If ibm,power-off-ups token is used
566 * it will allow auto poweron after power is restored.
567 */
pSeries_power_off(void)568 static void pSeries_power_off(void)
569 {
570 int rc;
571 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
572
573 if (rtas_flash_term_hook)
574 rtas_flash_term_hook(SYS_POWER_OFF);
575
576 if (rtas_poweron_auto == 0 ||
577 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
578 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
579 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
580 } else {
581 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
582 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
583 }
584 for (;;);
585 }
586
587 #ifndef CONFIG_PCI
pSeries_final_fixup(void)588 void pSeries_final_fixup(void) { }
589 #endif
590
define_machine(pseries)591 define_machine(pseries) {
592 .name = "pSeries",
593 .probe = pSeries_probe,
594 .setup_arch = pSeries_setup_arch,
595 .init_early = pSeries_init_early,
596 .show_cpuinfo = pSeries_show_cpuinfo,
597 .log_error = pSeries_log_error,
598 .pcibios_fixup = pSeries_final_fixup,
599 .pci_probe_mode = pSeries_pci_probe_mode,
600 .restart = rtas_restart,
601 .power_off = pSeries_power_off,
602 .halt = rtas_halt,
603 .panic = rtas_os_term,
604 .get_boot_time = rtas_get_boot_time,
605 .get_rtc_time = rtas_get_rtc_time,
606 .set_rtc_time = rtas_set_rtc_time,
607 .calibrate_decr = generic_calibrate_decr,
608 .progress = rtas_progress,
609 .system_reset_exception = pSeries_system_reset_exception,
610 .machine_check_exception = pSeries_machine_check_exception,
611 };
612