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/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>
45 #include <asm/processor.h>
47 #include <asm/pgtable.h>
50 #include <asm/pci-bridge.h>
51 #include <asm/iommu.h>
53 #include <asm/machdep.h>
56 #include <asm/nvram.h>
60 #include <asm/ppc-pci.h>
61 #include <asm/i8259.h>
64 #include <asm/firmware.h>
66 #include <asm/pSeries_reconfig.h>
68 #include "plpar_wrappers.h"
73 unsigned long CMO_PageSize
= (ASM_CONST(1) << IOMMU_PAGE_SHIFT
);
74 EXPORT_SYMBOL(CMO_PageSize
);
76 int fwnmi_active
; /* TRUE if an FWNMI handler is present */
78 static void pseries_shared_idle_sleep(void);
79 static void pseries_dedicated_idle_sleep(void);
81 static struct device_node
*pSeries_mpic_node
;
83 static void pSeries_show_cpuinfo(struct seq_file
*m
)
85 struct device_node
*root
;
86 const char *model
= "";
88 root
= of_find_node_by_path("/");
90 model
= of_get_property(root
, "model", NULL
);
91 seq_printf(m
, "machine\t\t: CHRP %s\n", model
);
95 /* Initialize firmware assisted non-maskable interrupts if
96 * the firmware supports this feature.
98 static void __init
fwnmi_init(void)
100 unsigned long system_reset_addr
, machine_check_addr
;
102 int ibm_nmi_register
= rtas_token("ibm,nmi-register");
103 if (ibm_nmi_register
== RTAS_UNKNOWN_SERVICE
)
106 /* If the kernel's not linked at zero we point the firmware at low
107 * addresses anyway, and use a trampoline to get to the real code. */
108 system_reset_addr
= __pa(system_reset_fwnmi
) - PHYSICAL_START
;
109 machine_check_addr
= __pa(machine_check_fwnmi
) - PHYSICAL_START
;
111 if (0 == rtas_call(ibm_nmi_register
, 2, 1, NULL
, system_reset_addr
,
116 static void pseries_8259_cascade(unsigned int irq
, struct irq_desc
*desc
)
118 unsigned int cascade_irq
= i8259_irq();
119 if (cascade_irq
!= NO_IRQ
)
120 generic_handle_irq(cascade_irq
);
121 desc
->chip
->eoi(irq
);
124 static void __init
pseries_setup_i8259_cascade(void)
126 struct device_node
*np
, *old
, *found
= NULL
;
127 unsigned int cascade
;
129 unsigned long intack
= 0;
132 for_each_node_by_type(np
, "interrupt-controller") {
133 if (of_device_is_compatible(np
, "chrp,iic")) {
140 printk(KERN_DEBUG
"pic: no ISA interrupt controller\n");
144 cascade
= irq_of_parse_and_map(found
, 0);
145 if (cascade
== NO_IRQ
) {
146 printk(KERN_ERR
"pic: failed to map cascade interrupt");
149 pr_debug("pic: cascade mapped to irq %d\n", cascade
);
151 for (old
= of_node_get(found
); old
!= NULL
; old
= np
) {
152 np
= of_get_parent(old
);
156 if (strcmp(np
->name
, "pci") != 0)
158 addrp
= of_get_property(np
, "8259-interrupt-acknowledge", NULL
);
161 naddr
= of_n_addr_cells(np
);
162 intack
= addrp
[naddr
-1];
164 intack
|= ((unsigned long)addrp
[naddr
-2]) << 32;
167 printk(KERN_DEBUG
"pic: PCI 8259 intack at 0x%016lx\n", intack
);
168 i8259_init(found
, intack
);
170 set_irq_chained_handler(cascade
, pseries_8259_cascade
);
173 static void __init
pseries_mpic_init_IRQ(void)
175 struct device_node
*np
;
176 const unsigned int *opprop
;
177 unsigned long openpic_addr
= 0;
178 int naddr
, n
, i
, opplen
;
181 np
= of_find_node_by_path("/");
182 naddr
= of_n_addr_cells(np
);
183 opprop
= of_get_property(np
, "platform-open-pic", &opplen
);
185 openpic_addr
= of_read_number(opprop
, naddr
);
186 printk(KERN_DEBUG
"OpenPIC addr: %lx\n", openpic_addr
);
190 BUG_ON(openpic_addr
== 0);
192 /* Setup the openpic driver */
193 mpic
= mpic_alloc(pSeries_mpic_node
, openpic_addr
,
195 16, 250, /* isu size, irq count */
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 /* All ISUs are setup, complete initialization */
209 /* Look for cascade */
210 pseries_setup_i8259_cascade();
213 static void __init
pseries_xics_init_IRQ(void)
216 pseries_setup_i8259_cascade();
219 static void pseries_lpar_enable_pmcs(void)
221 unsigned long set
, reset
;
225 plpar_hcall_norets(H_PERFMON
, set
, reset
);
227 /* instruct hypervisor to maintain PMCs */
228 if (firmware_has_feature(FW_FEATURE_SPLPAR
))
229 get_lppaca()->pmcregs_in_use
= 1;
232 static void __init
pseries_discover_pic(void)
234 struct device_node
*np
;
237 for (np
= NULL
; (np
= of_find_node_by_name(np
,
238 "interrupt-controller"));) {
239 typep
= of_get_property(np
, "compatible", NULL
);
240 if (strstr(typep
, "open-pic")) {
241 pSeries_mpic_node
= of_node_get(np
);
242 ppc_md
.init_IRQ
= pseries_mpic_init_IRQ
;
243 ppc_md
.get_irq
= mpic_get_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 static void __init
pSeries_setup_arch(void)
283 /* Discover PIC type and setup ppc_md accordingly */
284 pseries_discover_pic();
286 /* openpic global configuration register (64-bit format). */
287 /* openpic Interrupt Source Unit pointer (64-bit format). */
288 /* python0 facility area (mmio) (64-bit format) REAL address. */
290 /* init to some ~sane value until calibrate_delay() runs */
291 loops_per_jiffy
= 50000000;
295 /* Find and initialize PCI host bridges */
296 init_pci_config_tokens();
297 find_and_init_phbs();
298 pSeries_reconfig_notifier_register(&pci_dn_reconfig_nb
);
301 pSeries_nvram_init();
303 /* Choose an idle loop */
304 if (firmware_has_feature(FW_FEATURE_SPLPAR
)) {
305 vpa_init(boot_cpuid
);
306 if (get_lppaca()->shared_proc
) {
307 printk(KERN_DEBUG
"Using shared processor idle loop\n");
308 ppc_md
.power_save
= pseries_shared_idle_sleep
;
310 printk(KERN_DEBUG
"Using dedicated idle loop\n");
311 ppc_md
.power_save
= pseries_dedicated_idle_sleep
;
314 printk(KERN_DEBUG
"Using default idle loop\n");
317 if (firmware_has_feature(FW_FEATURE_LPAR
))
318 ppc_md
.enable_pmcs
= pseries_lpar_enable_pmcs
;
320 ppc_md
.enable_pmcs
= power4_enable_pmcs
;
323 static int __init
pSeries_init_panel(void)
325 /* Manually leave the kernel version on the panel. */
326 ppc_md
.progress("Linux ppc64\n", 0);
327 ppc_md
.progress(init_utsname()->version
, 0);
331 arch_initcall(pSeries_init_panel
);
333 static int pseries_set_dabr(unsigned long dabr
)
335 return plpar_hcall_norets(H_SET_DABR
, dabr
);
338 static int pseries_set_xdabr(unsigned long dabr
)
340 /* We want to catch accesses from kernel and userspace */
341 return plpar_hcall_norets(H_SET_XDABR
, dabr
,
342 H_DABRX_KERNEL
| H_DABRX_USER
);
345 #define CMO_CHARACTERISTICS_TOKEN 44
346 #define CMO_MAXLENGTH 1026
349 * fw_cmo_feature_init - FW_FEATURE_CMO is not stored in ibm,hypertas-functions,
350 * handle that here. (Stolen from parse_system_parameter_string)
352 void pSeries_cmo_feature_init(void)
354 char *ptr
, *key
, *value
, *end
;
356 int page_order
= IOMMU_PAGE_SHIFT
;
358 pr_debug(" -> fw_cmo_feature_init()\n");
359 spin_lock(&rtas_data_buf_lock
);
360 memset(rtas_data_buf
, 0, RTAS_DATA_BUF_SIZE
);
361 call_status
= rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
363 CMO_CHARACTERISTICS_TOKEN
,
367 if (call_status
!= 0) {
368 spin_unlock(&rtas_data_buf_lock
);
369 pr_debug("CMO not available\n");
370 pr_debug(" <- fw_cmo_feature_init()\n");
374 end
= rtas_data_buf
+ CMO_MAXLENGTH
- 2;
375 ptr
= rtas_data_buf
+ 2; /* step over strlen value */
378 while (*ptr
&& (ptr
<= end
)) {
379 /* Separate the key and value by replacing '=' with '\0' and
380 * point the value at the string after the '='
385 } else if (ptr
[0] == '\0' || ptr
[0] == ',') {
386 /* Terminate the string containing the key/value pair */
390 pr_debug("Malformed key/value pair\n");
391 /* Never found a '=', end processing */
395 if (0 == strcmp(key
, "CMOPageSize"))
396 page_order
= simple_strtol(value
, NULL
, 10);
397 else if (0 == strcmp(key
, "PrPSP"))
398 CMO_PrPSP
= simple_strtol(value
, NULL
, 10);
399 else if (0 == strcmp(key
, "SecPSP"))
400 CMO_SecPSP
= simple_strtol(value
, NULL
, 10);
401 value
= key
= ptr
+ 1;
406 /* Page size is returned as the power of 2 of the page size,
407 * convert to the page size in bytes before returning
409 CMO_PageSize
= 1 << page_order
;
410 pr_debug("CMO_PageSize = %lu\n", CMO_PageSize
);
412 if (CMO_PrPSP
!= -1 || CMO_SecPSP
!= -1) {
413 pr_info("CMO enabled\n");
414 pr_debug("CMO enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP
,
416 powerpc_firmware_features
|= FW_FEATURE_CMO
;
418 pr_debug("CMO not enabled, PrPSP=%d, SecPSP=%d\n", CMO_PrPSP
,
420 spin_unlock(&rtas_data_buf_lock
);
421 pr_debug(" <- fw_cmo_feature_init()\n");
425 * Early initialization. Relocation is on but do not reference unbolted pages
427 static void __init
pSeries_init_early(void)
429 pr_debug(" -> pSeries_init_early()\n");
431 if (firmware_has_feature(FW_FEATURE_LPAR
))
434 if (firmware_has_feature(FW_FEATURE_DABR
))
435 ppc_md
.set_dabr
= pseries_set_dabr
;
436 else if (firmware_has_feature(FW_FEATURE_XDABR
))
437 ppc_md
.set_dabr
= pseries_set_xdabr
;
439 pSeries_cmo_feature_init();
440 iommu_init_early_pSeries();
442 pr_debug(" <- pSeries_init_early()\n");
446 * Called very early, MMU is off, device-tree isn't unflattened
449 static int __init
pSeries_probe_hypertas(unsigned long node
,
450 const char *uname
, int depth
,
453 const char *hypertas
;
457 (strcmp(uname
, "rtas") != 0 && strcmp(uname
, "rtas@0") != 0))
460 hypertas
= of_get_flat_dt_prop(node
, "ibm,hypertas-functions", &len
);
464 powerpc_firmware_features
|= FW_FEATURE_LPAR
;
465 fw_feature_init(hypertas
, len
);
470 static int __init
pSeries_probe(void)
472 unsigned long root
= of_get_flat_dt_root();
473 char *dtype
= of_get_flat_dt_prop(root
, "device_type", NULL
);
477 if (strcmp(dtype
, "chrp"))
480 /* Cell blades firmware claims to be chrp while it's not. Until this
481 * is fixed, we need to avoid those here.
483 if (of_flat_dt_is_compatible(root
, "IBM,CPBW-1.0") ||
484 of_flat_dt_is_compatible(root
, "IBM,CBEA"))
487 pr_debug("pSeries detected, looking for LPAR capability...\n");
489 /* Now try to figure out if we are running on LPAR */
490 of_scan_flat_dt(pSeries_probe_hypertas
, NULL
);
492 if (firmware_has_feature(FW_FEATURE_LPAR
))
497 pr_debug("Machine is%s LPAR !\n",
498 (powerpc_firmware_features
& FW_FEATURE_LPAR
) ? "" : " not");
504 DECLARE_PER_CPU(unsigned long, smt_snooze_delay
);
506 static void pseries_dedicated_idle_sleep(void)
508 unsigned int cpu
= smp_processor_id();
509 unsigned long start_snooze
;
510 unsigned long in_purr
, out_purr
;
513 * Indicate to the HV that we are idle. Now would be
514 * a good time to find other work to dispatch.
516 get_lppaca()->idle
= 1;
517 get_lppaca()->donate_dedicated_cpu
= 1;
518 in_purr
= mfspr(SPRN_PURR
);
521 * We come in with interrupts disabled, and need_resched()
522 * has been checked recently. If we should poll for a little
525 if (__get_cpu_var(smt_snooze_delay
)) {
526 start_snooze
= get_tb() +
527 __get_cpu_var(smt_snooze_delay
) * tb_ticks_per_usec
;
529 set_thread_flag(TIF_POLLING_NRFLAG
);
531 while (get_tb() < start_snooze
) {
532 if (need_resched() || cpu_is_offline(cpu
))
534 ppc64_runlatch_off();
540 clear_thread_flag(TIF_POLLING_NRFLAG
);
543 if (need_resched() || cpu_is_offline(cpu
))
551 out_purr
= mfspr(SPRN_PURR
);
552 get_lppaca()->wait_state_cycles
+= out_purr
- in_purr
;
553 get_lppaca()->donate_dedicated_cpu
= 0;
554 get_lppaca()->idle
= 0;
557 static void pseries_shared_idle_sleep(void)
560 * Indicate to the HV that we are idle. Now would be
561 * a good time to find other work to dispatch.
563 get_lppaca()->idle
= 1;
566 * Yield the processor to the hypervisor. We return if
567 * an external interrupt occurs (which are driven prior
568 * to returning here) or if a prod occurs from another
569 * processor. When returning here, external interrupts
574 get_lppaca()->idle
= 0;
577 static int pSeries_pci_probe_mode(struct pci_bus
*bus
)
579 if (firmware_has_feature(FW_FEATURE_LPAR
))
580 return PCI_PROBE_DEVTREE
;
581 return PCI_PROBE_NORMAL
;
585 * pSeries_power_off - tell firmware about how to power off the system.
587 * This function calls either the power-off rtas token in normal cases
588 * or the ibm,power-off-ups token (if present & requested) in case of
589 * a power failure. If power-off token is used, power on will only be
590 * possible with power button press. If ibm,power-off-ups token is used
591 * it will allow auto poweron after power is restored.
593 static void pSeries_power_off(void)
596 int rtas_poweroff_ups_token
= rtas_token("ibm,power-off-ups");
598 if (rtas_flash_term_hook
)
599 rtas_flash_term_hook(SYS_POWER_OFF
);
601 if (rtas_poweron_auto
== 0 ||
602 rtas_poweroff_ups_token
== RTAS_UNKNOWN_SERVICE
) {
603 rc
= rtas_call(rtas_token("power-off"), 2, 1, NULL
, -1, -1);
604 printk(KERN_INFO
"RTAS power-off returned %d\n", rc
);
606 rc
= rtas_call(rtas_poweroff_ups_token
, 0, 1, NULL
);
607 printk(KERN_INFO
"RTAS ibm,power-off-ups returned %d\n", rc
);
613 void pSeries_final_fixup(void) { }
616 define_machine(pseries
) {
618 .probe
= pSeries_probe
,
619 .setup_arch
= pSeries_setup_arch
,
620 .init_early
= pSeries_init_early
,
621 .show_cpuinfo
= pSeries_show_cpuinfo
,
622 .log_error
= pSeries_log_error
,
623 .pcibios_fixup
= pSeries_final_fixup
,
624 .pci_probe_mode
= pSeries_pci_probe_mode
,
625 .restart
= rtas_restart
,
626 .power_off
= pSeries_power_off
,
628 .panic
= rtas_os_term
,
629 .get_boot_time
= rtas_get_boot_time
,
630 .get_rtc_time
= rtas_get_rtc_time
,
631 .set_rtc_time
= rtas_set_rtc_time
,
632 .calibrate_decr
= generic_calibrate_decr
,
633 .progress
= rtas_progress
,
634 .system_reset_exception
= pSeries_system_reset_exception
,
635 .machine_check_exception
= pSeries_machine_check_exception
,