2 * 64-bit pSeries and RS/6000 setup code.
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
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.
16 * bootup setup stuff..
19 #include <linux/cpu.h>
20 #include <linux/errno.h>
21 #include <linux/sched.h>
22 #include <linux/kernel.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>
44 #include <linux/kexec.h>
47 #include <asm/processor.h>
49 #include <asm/pgtable.h>
52 #include <asm/pci-bridge.h>
53 #include <asm/iommu.h>
55 #include <asm/machdep.h>
58 #include <asm/nvram.h>
62 #include <asm/ppc-pci.h>
63 #include <asm/i8259.h>
66 #include <asm/firmware.h>
70 #include "plpar_wrappers.h"
75 unsigned long CMO_PageSize = (ASM_CONST(1) << IOMMU_PAGE_SHIFT);
76 EXPORT_SYMBOL(CMO_PageSize);
78 int fwnmi_active; /* TRUE if an FWNMI handler is present */
80 static struct device_node *pSeries_mpic_node;
82 static void pSeries_show_cpuinfo(struct seq_file *m)
84 struct device_node *root;
85 const char *model = "";
87 root = of_find_node_by_path("/");
89 model = of_get_property(root, "model", NULL);
90 seq_printf(m, "machine\t\t: CHRP %s\n", model);
94 /* Initialize firmware assisted non-maskable interrupts if
95 * the firmware supports this feature.
97 static void __init fwnmi_init(void)
99 unsigned long system_reset_addr, machine_check_addr;
101 int ibm_nmi_register = rtas_token("ibm,nmi-register");
102 if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
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;
110 if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
115 static void pseries_8259_cascade(unsigned int irq, struct irq_desc *desc)
117 struct irq_chip *chip = irq_desc_get_chip(desc);
118 unsigned int cascade_irq = i8259_irq();
120 if (cascade_irq != NO_IRQ)
121 generic_handle_irq(cascade_irq);
123 chip->irq_eoi(&desc->irq_data);
126 static void __init pseries_setup_i8259_cascade(void)
128 struct device_node *np, *old, *found = NULL;
129 unsigned int cascade;
131 unsigned long intack = 0;
134 for_each_node_by_type(np, "interrupt-controller") {
135 if (of_device_is_compatible(np, "chrp,iic")) {
142 printk(KERN_DEBUG "pic: no ISA interrupt controller\n");
146 cascade = irq_of_parse_and_map(found, 0);
147 if (cascade == NO_IRQ) {
148 printk(KERN_ERR "pic: failed to map cascade interrupt");
151 pr_debug("pic: cascade mapped to irq %d\n", cascade);
153 for (old = of_node_get(found); old != NULL ; old = np) {
154 np = of_get_parent(old);
158 if (strcmp(np->name, "pci") != 0)
160 addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
163 naddr = of_n_addr_cells(np);
164 intack = addrp[naddr-1];
166 intack |= ((unsigned long)addrp[naddr-2]) << 32;
169 printk(KERN_DEBUG "pic: PCI 8259 intack at 0x%016lx\n", intack);
170 i8259_init(found, intack);
172 irq_set_chained_handler(cascade, pseries_8259_cascade);
175 static void __init pseries_mpic_init_IRQ(void)
177 struct device_node *np;
178 const unsigned int *opprop;
179 unsigned long openpic_addr = 0;
180 int naddr, n, i, opplen;
183 np = of_find_node_by_path("/");
184 naddr = of_n_addr_cells(np);
185 opprop = of_get_property(np, "platform-open-pic", &opplen);
187 openpic_addr = of_read_number(opprop, naddr);
188 printk(KERN_DEBUG "OpenPIC addr: %lx\n", openpic_addr);
192 BUG_ON(openpic_addr == 0);
194 /* Setup the openpic driver */
195 mpic = mpic_alloc(pSeries_mpic_node, openpic_addr,
196 MPIC_NO_RESET, 16, 0, " MPIC ");
197 BUG_ON(mpic == NULL);
200 opplen /= sizeof(u32);
201 for (n = 0, i = naddr; i < opplen; i += naddr, n++) {
202 unsigned long isuaddr = of_read_number(opprop + i, naddr);
203 mpic_assign_isu(mpic, n, isuaddr);
206 /* Setup top-level get_irq */
207 ppc_md.get_irq = mpic_get_irq;
209 /* All ISUs are setup, complete initialization */
212 /* Look for cascade */
213 pseries_setup_i8259_cascade();
216 static void __init pseries_xics_init_IRQ(void)
219 pseries_setup_i8259_cascade();
222 static void pseries_lpar_enable_pmcs(void)
224 unsigned long set, reset;
228 plpar_hcall_norets(H_PERFMON, set, reset);
231 static void __init pseries_discover_pic(void)
233 struct device_node *np;
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 setup_kexec_cpu_down_mpic();
243 smp_init_pseries_mpic();
245 } else if (strstr(typep, "ppc-xicp")) {
246 ppc_md.init_IRQ = pseries_xics_init_IRQ;
247 setup_kexec_cpu_down_xics();
248 smp_init_pseries_xics();
252 printk(KERN_ERR "pSeries_discover_pic: failed to recognize"
253 " interrupt-controller\n");
256 static int pci_dn_reconfig_notifier(struct notifier_block *nb, unsigned long action, void *data)
258 struct of_reconfig_data *rd = data;
259 struct device_node *np = rd->dn;
260 struct pci_dn *pci = NULL;
264 case OF_RECONFIG_ATTACH_NODE:
265 pci = np->parent->data;
267 update_dn_pci_info(np, pci->phb);
269 /* Create EEH device for the OF node */
270 eeh_dev_init(np, pci->phb);
280 static struct notifier_block pci_dn_reconfig_nb = {
281 .notifier_call = pci_dn_reconfig_notifier,
284 struct kmem_cache *dtl_cache;
286 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
288 * Allocate space for the dispatch trace log for all possible cpus
289 * and register the buffers with the hypervisor. This is used for
290 * computing time stolen by the hypervisor.
292 static int alloc_dispatch_logs(void)
295 struct paca_struct *pp;
296 struct dtl_entry *dtl;
298 if (!firmware_has_feature(FW_FEATURE_SPLPAR))
304 for_each_possible_cpu(cpu) {
306 dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
308 pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
310 pr_warn("Stolen time statistics will be unreliable\n");
315 pp->dispatch_log = dtl;
316 pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
320 /* Register the DTL for the current (boot) cpu */
321 dtl = get_paca()->dispatch_log;
322 get_paca()->dtl_ridx = 0;
323 get_paca()->dtl_curr = dtl;
324 get_paca()->lppaca_ptr->dtl_idx = 0;
326 /* hypervisor reads buffer length from this field */
327 dtl->enqueue_to_dispatch_time = DISPATCH_LOG_BYTES;
328 ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
330 pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
331 "with %d\n", smp_processor_id(),
332 hard_smp_processor_id(), ret);
333 get_paca()->lppaca_ptr->dtl_enable_mask = 2;
337 #else /* !CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
338 static inline int alloc_dispatch_logs(void)
342 #endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
344 static int alloc_dispatch_log_kmem_cache(void)
346 dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
347 DISPATCH_LOG_BYTES, 0, NULL);
349 pr_warn("Failed to create dispatch trace log buffer cache\n");
350 pr_warn("Stolen time statistics will be unreliable\n");
354 return alloc_dispatch_logs();
356 early_initcall(alloc_dispatch_log_kmem_cache);
358 static void pSeries_idle(void)
360 /* This would call on the cpuidle framework, and the back-end pseries
361 * driver to go to idle states
363 if (cpuidle_idle_call()) {
364 /* On error, execute default handler
365 * to go into low thread priority and possibly
374 * Enable relocation on during exceptions. This has partition wide scope and
375 * may take a while to complete, if it takes longer than one second we will
376 * just give up rather than wasting any more time on this - if that turns out
377 * to ever be a problem in practice we can move this into a kernel thread to
378 * finish off the process later in boot.
380 long pSeries_enable_reloc_on_exc(void)
383 unsigned int delay, total_delay = 0;
386 rc = enable_reloc_on_exceptions();
387 if (!H_IS_LONG_BUSY(rc))
390 delay = get_longbusy_msecs(rc);
391 total_delay += delay;
392 if (total_delay > 1000) {
393 pr_warn("Warning: Giving up waiting to enable "
394 "relocation on exceptions (%u msec)!\n",
402 EXPORT_SYMBOL(pSeries_enable_reloc_on_exc);
404 long pSeries_disable_reloc_on_exc(void)
409 rc = disable_reloc_on_exceptions();
410 if (!H_IS_LONG_BUSY(rc))
412 mdelay(get_longbusy_msecs(rc));
415 EXPORT_SYMBOL(pSeries_disable_reloc_on_exc);
418 static void pSeries_machine_kexec(struct kimage *image)
422 if (firmware_has_feature(FW_FEATURE_SET_MODE) &&
423 (image->type != KEXEC_TYPE_CRASH)) {
424 rc = pSeries_disable_reloc_on_exc();
426 pr_warning("Warning: Failed to disable relocation on "
427 "exceptions: %ld\n", rc);
430 default_machine_kexec(image);
434 static void __init pSeries_setup_arch(void)
438 /* Discover PIC type and setup ppc_md accordingly */
439 pseries_discover_pic();
441 /* openpic global configuration register (64-bit format). */
442 /* openpic Interrupt Source Unit pointer (64-bit format). */
443 /* python0 facility area (mmio) (64-bit format) REAL address. */
445 /* init to some ~sane value until calibrate_delay() runs */
446 loops_per_jiffy = 50000000;
450 /* By default, only probe PCI (can be overriden by rtas_pci) */
451 pci_add_flags(PCI_PROBE_ONLY);
453 /* Find and initialize PCI host bridges */
454 init_pci_config_tokens();
455 find_and_init_phbs();
456 of_reconfig_notifier_register(&pci_dn_reconfig_nb);
458 pSeries_nvram_init();
460 if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
461 vpa_init(boot_cpuid);
462 ppc_md.power_save = pSeries_idle;
465 if (firmware_has_feature(FW_FEATURE_LPAR))
466 ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
468 ppc_md.enable_pmcs = power4_enable_pmcs;
470 ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
472 if (firmware_has_feature(FW_FEATURE_SET_MODE)) {
474 if ((rc = pSeries_enable_reloc_on_exc()) != H_SUCCESS) {
475 pr_warn("Unable to enable relocation on exceptions: "
481 static int __init pSeries_init_panel(void)
483 /* Manually leave the kernel version on the panel. */
484 ppc_md.progress("Linux ppc64\n", 0);
485 ppc_md.progress(init_utsname()->version, 0);
489 machine_arch_initcall(pseries, pSeries_init_panel);
491 static int pseries_set_dabr(unsigned long dabr, unsigned long dabrx)
493 return plpar_hcall_norets(H_SET_DABR, dabr);
496 static int pseries_set_xdabr(unsigned long dabr, unsigned long dabrx)
498 /* Have to set at least one bit in the DABRX according to PAPR */
499 if (dabrx == 0 && dabr == 0)
501 /* PAPR says we can only set kernel and user bits */
502 dabrx &= DABRX_KERNEL | DABRX_USER;
504 return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
507 static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
509 /* PAPR says we can't set HYP */
512 return plapr_set_watchpoint0(dawr, dawrx);
515 #define CMO_CHARACTERISTICS_TOKEN 44
516 #define CMO_MAXLENGTH 1026
518 void pSeries_coalesce_init(void)
520 struct hvcall_mpp_x_data mpp_x_data;
522 if (firmware_has_feature(FW_FEATURE_CMO) && !h_get_mpp_x(&mpp_x_data))
523 powerpc_firmware_features |= FW_FEATURE_XCMO;
525 powerpc_firmware_features &= ~FW_FEATURE_XCMO;
529 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
530 * handle that here. (Stolen from parse_system_parameter_string)
532 void pSeries_cmo_feature_init(void)
534 char *ptr, *key, *value, *end;
536 int page_order = IOMMU_PAGE_SHIFT;
538 pr_debug(" -> fw_cmo_feature_init()\n");
539 spin_lock(&rtas_data_buf_lock);
540 memset(rtas_data_buf, 0, RTAS_DATA_BUF_SIZE);
541 call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
543 CMO_CHARACTERISTICS_TOKEN,
547 if (call_status != 0) {
548 spin_unlock(&rtas_data_buf_lock);
549 pr_debug("CMO not available\n");
550 pr_debug(" <- fw_cmo_feature_init()\n");
554 end = rtas_data_buf + CMO_MAXLENGTH - 2;
555 ptr = rtas_data_buf + 2; /* step over strlen value */
558 while (*ptr && (ptr <= end)) {
559 /* Separate the key and value by replacing '=' with '\0' and
560 * point the value at the string after the '='
565 } else if (ptr[0] == '\0' || ptr[0] == ',') {
566 /* Terminate the string containing the key/value pair */
570 pr_debug("Malformed key/value pair\n");
571 /* Never found a '=', end processing */
575 if (0 == strcmp(key, "CMOPageSize"))
576 page_order = simple_strtol(value, NULL, 10);
577 else if (0 == strcmp(key, "PrPSP"))
578 CMO_PrPSP = simple_strtol(value, NULL, 10);
579 else if (0 == strcmp(key, "SecPSP"))
580 CMO_SecPSP = simple_strtol(value, NULL, 10);
581 value = key = ptr + 1;
586 /* Page size is returned as the power of 2 of the page size,
587 * convert to the page size in bytes before returning
589 CMO_PageSize = 1 << page_order;
590 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize);
592 if (CMO_PrPSP != -1 || CMO_SecPSP != -1) {
593 pr_info("CMO enabled\n");
594 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
596 powerpc_firmware_features |= FW_FEATURE_CMO;
597 pSeries_coalesce_init();
599 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP,
601 spin_unlock(&rtas_data_buf_lock);
602 pr_debug(" <- fw_cmo_feature_init()\n");
606 * Early initialization. Relocation is on but do not reference unbolted pages
608 static void __init pSeries_init_early(void)
610 pr_debug(" -> pSeries_init_early()\n");
612 #ifdef CONFIG_HVC_CONSOLE
613 if (firmware_has_feature(FW_FEATURE_LPAR))
614 hvc_vio_init_early();
616 if (firmware_has_feature(FW_FEATURE_XDABR))
617 ppc_md.set_dabr = pseries_set_xdabr;
618 else if (firmware_has_feature(FW_FEATURE_DABR))
619 ppc_md.set_dabr = pseries_set_dabr;
621 if (firmware_has_feature(FW_FEATURE_SET_MODE))
622 ppc_md.set_dawr = pseries_set_dawr;
624 pSeries_cmo_feature_init();
625 iommu_init_early_pSeries();
627 pr_debug(" <- pSeries_init_early()\n");
631 * Called very early, MMU is off, device-tree isn't unflattened
634 static int __init pseries_probe_fw_features(unsigned long node,
635 const char *uname, int depth,
640 static int hypertas_found;
641 static int vec5_found;
646 if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
647 prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
650 powerpc_firmware_features |= FW_FEATURE_LPAR;
651 fw_hypertas_feature_init(prop, len);
657 if (!strcmp(uname, "chosen")) {
658 prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
661 fw_vec5_feature_init(prop, len);
666 return hypertas_found && vec5_found;
669 static int __init pSeries_probe(void)
671 unsigned long root = of_get_flat_dt_root();
672 char *dtype = of_get_flat_dt_prop(root, "device_type", NULL);
676 if (strcmp(dtype, "chrp"))
679 /* Cell blades firmware claims to be chrp while it's not. Until this
680 * is fixed, we need to avoid those here.
682 if (of_flat_dt_is_compatible(root, "IBM,CPBW-1.0") ||
683 of_flat_dt_is_compatible(root, "IBM,CBEA"))
686 pr_debug("pSeries detected, looking for LPAR capability...\n");
688 /* Now try to figure out if we are running on LPAR */
689 of_scan_flat_dt(pseries_probe_fw_features, NULL);
691 if (firmware_has_feature(FW_FEATURE_LPAR))
696 pr_debug("Machine is%s LPAR !\n",
697 (powerpc_firmware_features & FW_FEATURE_LPAR) ? "" : " not");
702 static int pSeries_pci_probe_mode(struct pci_bus *bus)
704 if (firmware_has_feature(FW_FEATURE_LPAR))
705 return PCI_PROBE_DEVTREE;
706 return PCI_PROBE_NORMAL;
710 * pSeries_power_off - tell firmware about how to power off the system.
712 * This function calls either the power-off rtas token in normal cases
713 * or the ibm,power-off-ups token (if present & requested) in case of
714 * a power failure. If power-off token is used, power on will only be
715 * possible with power button press. If ibm,power-off-ups token is used
716 * it will allow auto poweron after power is restored.
718 static void pSeries_power_off(void)
721 int rtas_poweroff_ups_token = rtas_token("ibm,power-off-ups");
723 if (rtas_flash_term_hook)
724 rtas_flash_term_hook(SYS_POWER_OFF);
726 if (rtas_poweron_auto == 0 ||
727 rtas_poweroff_ups_token == RTAS_UNKNOWN_SERVICE) {
728 rc = rtas_call(rtas_token("power-off"), 2, 1, NULL, -1, -1);
729 printk(KERN_INFO "RTAS power-off returned %d\n", rc);
731 rc = rtas_call(rtas_poweroff_ups_token, 0, 1, NULL);
732 printk(KERN_INFO "RTAS ibm,power-off-ups returned %d\n", rc);
738 void pSeries_final_fixup(void) { }
741 define_machine(pseries) {
743 .probe = pSeries_probe,
744 .setup_arch = pSeries_setup_arch,
745 .init_early = pSeries_init_early,
746 .show_cpuinfo = pSeries_show_cpuinfo,
747 .log_error = pSeries_log_error,
748 .pcibios_fixup = pSeries_final_fixup,
749 .pci_probe_mode = pSeries_pci_probe_mode,
750 .restart = rtas_restart,
751 .power_off = pSeries_power_off,
753 .panic = rtas_os_term,
754 .get_boot_time = rtas_get_boot_time,
755 .get_rtc_time = rtas_get_rtc_time,
756 .set_rtc_time = rtas_set_rtc_time,
757 .calibrate_decr = generic_calibrate_decr,
758 .progress = rtas_progress,
759 .system_reset_exception = pSeries_system_reset_exception,
760 .machine_check_exception = pSeries_machine_check_exception,
762 .machine_kexec = pSeries_machine_kexec,