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/module.h>
38 #include <linux/delay.h>
39 #include <linux/irq.h>
40 #include <linux/seq_file.h>
41 #include <linux/root_dev.h>
44 #include <asm/processor.h>
46 #include <asm/pgtable.h>
49 #include <asm/pci-bridge.h>
50 #include <asm/iommu.h>
52 #include <asm/machdep.h>
55 #include <asm/nvram.h>
59 #include <asm/ppc-pci.h>
60 #include <asm/i8259.h>
63 #include <asm/firmware.h>
65 #include <asm/pSeries_reconfig.h>
67 #include "plpar_wrappers.h"
72 unsigned long CMO_PageSize
= (ASM_CONST(1) << IOMMU_PAGE_SHIFT
);
73 EXPORT_SYMBOL(CMO_PageSize
);
75 int fwnmi_active
; /* TRUE if an FWNMI handler is present */
77 static void pseries_shared_idle_sleep(void);
78 static void pseries_dedicated_idle_sleep(void);
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
,
197 16, 250, /* isu size, irq count */
199 BUG_ON(mpic
== NULL
);
202 opplen
/= sizeof(u32
);
203 for (n
= 0, i
= naddr
; i
< opplen
; i
+= naddr
, n
++) {
204 unsigned long isuaddr
= of_read_number(opprop
+ i
, naddr
);
205 mpic_assign_isu(mpic
, n
, isuaddr
);
208 /* Setup top-level get_irq */
209 ppc_md
.get_irq
= mpic_get_irq
;
211 /* All ISUs are setup, complete initialization */
214 /* Look for cascade */
215 pseries_setup_i8259_cascade();
218 static void __init
pseries_xics_init_IRQ(void)
221 pseries_setup_i8259_cascade();
224 static void pseries_lpar_enable_pmcs(void)
226 unsigned long set
, reset
;
230 plpar_hcall_norets(H_PERFMON
, set
, reset
);
233 static void __init
pseries_discover_pic(void)
235 struct device_node
*np
;
238 for (np
= NULL
; (np
= of_find_node_by_name(np
,
239 "interrupt-controller"));) {
240 typep
= of_get_property(np
, "compatible", NULL
);
241 if (strstr(typep
, "open-pic")) {
242 pSeries_mpic_node
= of_node_get(np
);
243 ppc_md
.init_IRQ
= pseries_mpic_init_IRQ
;
244 setup_kexec_cpu_down_mpic();
245 smp_init_pseries_mpic();
247 } else if (strstr(typep
, "ppc-xicp")) {
248 ppc_md
.init_IRQ
= pseries_xics_init_IRQ
;
249 setup_kexec_cpu_down_xics();
250 smp_init_pseries_xics();
254 printk(KERN_ERR
"pSeries_discover_pic: failed to recognize"
255 " interrupt-controller\n");
258 static int pci_dn_reconfig_notifier(struct notifier_block
*nb
, unsigned long action
, void *node
)
260 struct device_node
*np
= node
;
261 struct pci_dn
*pci
= NULL
;
265 case PSERIES_RECONFIG_ADD
:
266 pci
= np
->parent
->data
;
268 update_dn_pci_info(np
, pci
->phb
);
277 static struct notifier_block pci_dn_reconfig_nb
= {
278 .notifier_call
= pci_dn_reconfig_notifier
,
281 struct kmem_cache
*dtl_cache
;
283 #ifdef CONFIG_VIRT_CPU_ACCOUNTING
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.
289 static int alloc_dispatch_logs(void)
292 struct paca_struct
*pp
;
293 struct dtl_entry
*dtl
;
295 if (!firmware_has_feature(FW_FEATURE_SPLPAR
))
301 for_each_possible_cpu(cpu
) {
303 dtl
= kmem_cache_alloc(dtl_cache
, GFP_KERNEL
);
305 pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
307 pr_warn("Stolen time statistics will be unreliable\n");
312 pp
->dispatch_log
= dtl
;
313 pp
->dispatch_log_end
= dtl
+ N_DISPATCH_LOG
;
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;
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
));
327 pr_warn("DTL registration failed for boot cpu %d (%d)\n",
328 smp_processor_id(), ret
);
329 get_paca()->lppaca_ptr
->dtl_enable_mask
= 2;
333 #else /* !CONFIG_VIRT_CPU_ACCOUNTING */
334 static inline int alloc_dispatch_logs(void)
338 #endif /* CONFIG_VIRT_CPU_ACCOUNTING */
340 static int alloc_dispatch_log_kmem_cache(void)
342 dtl_cache
= kmem_cache_create("dtl", DISPATCH_LOG_BYTES
,
343 DISPATCH_LOG_BYTES
, 0, NULL
);
345 pr_warn("Failed to create dispatch trace log buffer cache\n");
346 pr_warn("Stolen time statistics will be unreliable\n");
350 return alloc_dispatch_logs();
352 early_initcall(alloc_dispatch_log_kmem_cache
);
354 static void __init
pSeries_setup_arch(void)
356 /* Discover PIC type and setup ppc_md accordingly */
357 pseries_discover_pic();
359 /* openpic global configuration register (64-bit format). */
360 /* openpic Interrupt Source Unit pointer (64-bit format). */
361 /* python0 facility area (mmio) (64-bit format) REAL address. */
363 /* init to some ~sane value until calibrate_delay() runs */
364 loops_per_jiffy
= 50000000;
368 /* Find and initialize PCI host bridges */
369 init_pci_config_tokens();
370 find_and_init_phbs();
371 pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb
);
374 pSeries_nvram_init();
376 /* Choose an idle loop */
377 if (firmware_has_feature(FW_FEATURE_SPLPAR
)) {
378 vpa_init(boot_cpuid
);
379 if (get_lppaca()->shared_proc
) {
380 printk(KERN_DEBUG
"Using shared processor idle loop\n");
381 ppc_md
.power_save
= pseries_shared_idle_sleep
;
383 printk(KERN_DEBUG
"Using dedicated idle loop\n");
384 ppc_md
.power_save
= pseries_dedicated_idle_sleep
;
387 printk(KERN_DEBUG
"Using default idle loop\n");
390 if (firmware_has_feature(FW_FEATURE_LPAR
))
391 ppc_md
.enable_pmcs
= pseries_lpar_enable_pmcs
;
393 ppc_md
.enable_pmcs
= power4_enable_pmcs
;
396 static int __init
pSeries_init_panel(void)
398 /* Manually leave the kernel version on the panel. */
399 ppc_md
.progress("Linux ppc64\n", 0);
400 ppc_md
.progress(init_utsname()->version
, 0);
404 machine_arch_initcall(pseries
, pSeries_init_panel
);
406 static int pseries_set_dabr(unsigned long dabr
)
408 return plpar_hcall_norets(H_SET_DABR
, dabr
);
411 static int pseries_set_xdabr(unsigned long dabr
)
413 /* We want to catch accesses from kernel and userspace */
414 return plpar_hcall_norets(H_SET_XDABR
, dabr
,
415 H_DABRX_KERNEL
| H_DABRX_USER
);
418 #define CMO_CHARACTERISTICS_TOKEN 44
419 #define CMO_MAXLENGTH 1026
421 void pSeries_coalesce_init(void)
423 struct hvcall_mpp_x_data mpp_x_data
;
425 if (firmware_has_feature(FW_FEATURE_CMO
) && !h_get_mpp_x(&mpp_x_data
))
426 powerpc_firmware_features
|= FW_FEATURE_XCMO
;
428 powerpc_firmware_features
&= ~FW_FEATURE_XCMO
;
432 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
433 * handle that here. (Stolen from parse_system_parameter_string)
435 void pSeries_cmo_feature_init(void)
437 char *ptr
, *key
, *value
, *end
;
439 int page_order
= IOMMU_PAGE_SHIFT
;
441 pr_debug(" -> fw_cmo_feature_init()\n");
442 spin_lock(&rtas_data_buf_lock
);
443 memset(rtas_data_buf
, 0, RTAS_DATA_BUF_SIZE
);
444 call_status
= rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
446 CMO_CHARACTERISTICS_TOKEN
,
450 if (call_status
!= 0) {
451 spin_unlock(&rtas_data_buf_lock
);
452 pr_debug("CMO not available\n");
453 pr_debug(" <- fw_cmo_feature_init()\n");
457 end
= rtas_data_buf
+ CMO_MAXLENGTH
- 2;
458 ptr
= rtas_data_buf
+ 2; /* step over strlen value */
461 while (*ptr
&& (ptr
<= end
)) {
462 /* Separate the key and value by replacing '=' with '\0' and
463 * point the value at the string after the '='
468 } else if (ptr
[0] == '\0' || ptr
[0] == ',') {
469 /* Terminate the string containing the key/value pair */
473 pr_debug("Malformed key/value pair\n");
474 /* Never found a '=', end processing */
478 if (0 == strcmp(key
, "CMOPageSize"))
479 page_order
= simple_strtol(value
, NULL
, 10);
480 else if (0 == strcmp(key
, "PrPSP"))
481 CMO_PrPSP
= simple_strtol(value
, NULL
, 10);
482 else if (0 == strcmp(key
, "SecPSP"))
483 CMO_SecPSP
= simple_strtol(value
, NULL
, 10);
484 value
= key
= ptr
+ 1;
489 /* Page size is returned as the power of 2 of the page size,
490 * convert to the page size in bytes before returning
492 CMO_PageSize
= 1 << page_order
;
493 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize
);
495 if (CMO_PrPSP
!= -1 || CMO_SecPSP
!= -1) {
496 pr_info("CMO enabled\n");
497 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP
,
499 powerpc_firmware_features
|= FW_FEATURE_CMO
;
500 pSeries_coalesce_init();
502 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP
,
504 spin_unlock(&rtas_data_buf_lock
);
505 pr_debug(" <- fw_cmo_feature_init()\n");
509 * Early initialization. Relocation is on but do not reference unbolted pages
511 static void __init
pSeries_init_early(void)
513 pr_debug(" -> pSeries_init_early()\n");
515 if (firmware_has_feature(FW_FEATURE_LPAR
))
518 if (firmware_has_feature(FW_FEATURE_DABR
))
519 ppc_md
.set_dabr
= pseries_set_dabr
;
520 else if (firmware_has_feature(FW_FEATURE_XDABR
))
521 ppc_md
.set_dabr
= pseries_set_xdabr
;
523 pSeries_cmo_feature_init();
524 iommu_init_early_pSeries();
526 pr_debug(" <- pSeries_init_early()\n");
530 * Called very early, MMU is off, device-tree isn't unflattened
533 static int __init
pSeries_probe_hypertas(unsigned long node
,
534 const char *uname
, int depth
,
537 const char *hypertas
;
541 (strcmp(uname
, "rtas") != 0 && strcmp(uname
, "rtas@0") != 0))
544 hypertas
= of_get_flat_dt_prop(node
, "ibm,hypertas-functions", &len
);
548 powerpc_firmware_features
|= FW_FEATURE_LPAR
;
549 fw_feature_init(hypertas
, len
);
554 static int __init
pSeries_probe(void)
556 unsigned long root
= of_get_flat_dt_root();
557 char *dtype
= of_get_flat_dt_prop(root
, "device_type", NULL
);
561 if (strcmp(dtype
, "chrp"))
564 /* Cell blades firmware claims to be chrp while it's not. Until this
565 * is fixed, we need to avoid those here.
567 if (of_flat_dt_is_compatible(root
, "IBM,CPBW-1.0") ||
568 of_flat_dt_is_compatible(root
, "IBM,CBEA"))
571 pr_debug("pSeries detected, looking for LPAR capability...\n");
573 /* Now try to figure out if we are running on LPAR */
574 of_scan_flat_dt(pSeries_probe_hypertas
, NULL
);
576 if (firmware_has_feature(FW_FEATURE_LPAR
))
581 pr_debug("Machine is%s LPAR !\n",
582 (powerpc_firmware_features
& FW_FEATURE_LPAR
) ? "" : " not");
588 DECLARE_PER_CPU(long, smt_snooze_delay
);
590 static void pseries_dedicated_idle_sleep(void)
592 unsigned int cpu
= smp_processor_id();
593 unsigned long start_snooze
;
594 unsigned long in_purr
, out_purr
;
595 long snooze
= __get_cpu_var(smt_snooze_delay
);
598 * Indicate to the HV that we are idle. Now would be
599 * a good time to find other work to dispatch.
601 get_lppaca()->idle
= 1;
602 get_lppaca()->donate_dedicated_cpu
= 1;
603 in_purr
= mfspr(SPRN_PURR
);
606 * We come in with interrupts disabled, and need_resched()
607 * has been checked recently. If we should poll for a little
611 start_snooze
= get_tb() + snooze
* tb_ticks_per_usec
;
613 set_thread_flag(TIF_POLLING_NRFLAG
);
615 while ((snooze
< 0) || (get_tb() < start_snooze
)) {
616 if (need_resched() || cpu_is_offline(cpu
))
618 ppc64_runlatch_off();
624 clear_thread_flag(TIF_POLLING_NRFLAG
);
627 if (need_resched() || cpu_is_offline(cpu
))
635 out_purr
= mfspr(SPRN_PURR
);
636 get_lppaca()->wait_state_cycles
+= out_purr
- in_purr
;
637 get_lppaca()->donate_dedicated_cpu
= 0;
638 get_lppaca()->idle
= 0;
641 static void pseries_shared_idle_sleep(void)
644 * Indicate to the HV that we are idle. Now would be
645 * a good time to find other work to dispatch.
647 get_lppaca()->idle
= 1;
650 * Yield the processor to the hypervisor. We return if
651 * an external interrupt occurs (which are driven prior
652 * to returning here) or if a prod occurs from another
653 * processor. When returning here, external interrupts
658 get_lppaca()->idle
= 0;
661 static int pSeries_pci_probe_mode(struct pci_bus
*bus
)
663 if (firmware_has_feature(FW_FEATURE_LPAR
))
664 return PCI_PROBE_DEVTREE
;
665 return PCI_PROBE_NORMAL
;
669 * pSeries_power_off - tell firmware about how to power off the system.
671 * This function calls either the power-off rtas token in normal cases
672 * or the ibm,power-off-ups token (if present & requested) in case of
673 * a power failure. If power-off token is used, power on will only be
674 * possible with power button press. If ibm,power-off-ups token is used
675 * it will allow auto poweron after power is restored.
677 static void pSeries_power_off(void)
680 int rtas_poweroff_ups_token
= rtas_token("ibm,power-off-ups");
682 if (rtas_flash_term_hook
)
683 rtas_flash_term_hook(SYS_POWER_OFF
);
685 if (rtas_poweron_auto
== 0 ||
686 rtas_poweroff_ups_token
== RTAS_UNKNOWN_SERVICE
) {
687 rc
= rtas_call(rtas_token("power-off"), 2, 1, NULL
, -1, -1);
688 printk(KERN_INFO
"RTAS power-off returned %d\n", rc
);
690 rc
= rtas_call(rtas_poweroff_ups_token
, 0, 1, NULL
);
691 printk(KERN_INFO
"RTAS ibm,power-off-ups returned %d\n", rc
);
697 void pSeries_final_fixup(void) { }
700 define_machine(pseries
) {
702 .probe
= pSeries_probe
,
703 .setup_arch
= pSeries_setup_arch
,
704 .init_early
= pSeries_init_early
,
705 .show_cpuinfo
= pSeries_show_cpuinfo
,
706 .log_error
= pSeries_log_error
,
707 .pcibios_fixup
= pSeries_final_fixup
,
708 .pci_probe_mode
= pSeries_pci_probe_mode
,
709 .restart
= rtas_restart
,
710 .power_off
= pSeries_power_off
,
712 .panic
= rtas_os_term
,
713 .get_boot_time
= rtas_get_boot_time
,
714 .get_rtc_time
= rtas_get_rtc_time
,
715 .set_rtc_time
= rtas_set_rtc_time
,
716 .calibrate_decr
= generic_calibrate_decr
,
717 .progress
= rtas_progress
,
718 .system_reset_exception
= pSeries_system_reset_exception
,
719 .machine_check_exception
= pSeries_machine_check_exception
,