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..
21 #include <linux/cpu.h>
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
26 #include <linux/stddef.h>
27 #include <linux/unistd.h>
28 #include <linux/slab.h>
29 #include <linux/user.h>
30 #include <linux/a.out.h>
31 #include <linux/tty.h>
32 #include <linux/major.h>
33 #include <linux/interrupt.h>
34 #include <linux/reboot.h>
35 #include <linux/init.h>
36 #include <linux/ioport.h>
37 #include <linux/console.h>
38 #include <linux/pci.h>
39 #include <linux/utsname.h>
40 #include <linux/adb.h>
41 #include <linux/module.h>
42 #include <linux/delay.h>
43 #include <linux/irq.h>
44 #include <linux/seq_file.h>
45 #include <linux/root_dev.h>
48 #include <asm/processor.h>
50 #include <asm/pgtable.h>
53 #include <asm/pci-bridge.h>
54 #include <asm/iommu.h>
56 #include <asm/machdep.h>
59 #include <asm/nvram.h>
63 #include <asm/ppc-pci.h>
64 #include <asm/i8259.h>
67 #include <asm/firmware.h>
70 #include "plpar_wrappers.h"
74 #define DBG(fmt...) udbg_printf(fmt)
79 int fwnmi_active
; /* TRUE if an FWNMI handler is present */
81 static void pseries_shared_idle_sleep(void);
82 static void pseries_dedicated_idle_sleep(void);
84 static struct device_node
*pSeries_mpic_node
;
86 static void pSeries_show_cpuinfo(struct seq_file
*m
)
88 struct device_node
*root
;
89 const char *model
= "";
91 root
= of_find_node_by_path("/");
93 model
= of_get_property(root
, "model", NULL
);
94 seq_printf(m
, "machine\t\t: CHRP %s\n", model
);
98 /* Initialize firmware assisted non-maskable interrupts if
99 * the firmware supports this feature.
101 static void __init
fwnmi_init(void)
103 unsigned long system_reset_addr
, machine_check_addr
;
105 int ibm_nmi_register
= rtas_token("ibm,nmi-register");
106 if (ibm_nmi_register
== RTAS_UNKNOWN_SERVICE
)
109 /* If the kernel's not linked at zero we point the firmware at low
110 * addresses anyway, and use a trampoline to get to the real code. */
111 system_reset_addr
= __pa(system_reset_fwnmi
) - PHYSICAL_START
;
112 machine_check_addr
= __pa(machine_check_fwnmi
) - PHYSICAL_START
;
114 if (0 == rtas_call(ibm_nmi_register
, 2, 1, NULL
, system_reset_addr
,
119 void pseries_8259_cascade(unsigned int irq
, struct irq_desc
*desc
)
121 unsigned int cascade_irq
= i8259_irq();
122 if (cascade_irq
!= NO_IRQ
)
123 generic_handle_irq(cascade_irq
);
124 desc
->chip
->eoi(irq
);
127 static void __init
pseries_setup_i8259_cascade(void)
129 struct device_node
*np
, *old
, *found
= NULL
;
130 unsigned int cascade
;
132 unsigned long intack
= 0;
135 for_each_node_by_type(np
, "interrupt-controller") {
136 if (of_device_is_compatible(np
, "chrp,iic")) {
143 printk(KERN_DEBUG
"pic: no ISA interrupt controller\n");
147 cascade
= irq_of_parse_and_map(found
, 0);
148 if (cascade
== NO_IRQ
) {
149 printk(KERN_ERR
"pic: failed to map cascade interrupt");
152 pr_debug("pic: cascade mapped to irq %d\n", cascade
);
154 for (old
= of_node_get(found
); old
!= NULL
; old
= np
) {
155 np
= of_get_parent(old
);
159 if (strcmp(np
->name
, "pci") != 0)
161 addrp
= of_get_property(np
, "8259-interrupt-acknowledge", NULL
);
164 naddr
= of_n_addr_cells(np
);
165 intack
= addrp
[naddr
-1];
167 intack
|= ((unsigned long)addrp
[naddr
-2]) << 32;
170 printk(KERN_DEBUG
"pic: PCI 8259 intack at 0x%016lx\n", intack
);
171 i8259_init(found
, intack
);
173 set_irq_chained_handler(cascade
, pseries_8259_cascade
);
176 static void __init
pseries_mpic_init_IRQ(void)
178 struct device_node
*np
, *old
, *cascade
= NULL
;
179 const unsigned int *addrp
;
180 unsigned long intack
= 0;
181 const unsigned int *opprop
;
182 unsigned long openpic_addr
= 0;
183 unsigned int cascade_irq
;
184 int naddr
, n
, i
, opplen
;
187 np
= of_find_node_by_path("/");
188 naddr
= of_n_addr_cells(np
);
189 opprop
= of_get_property(np
, "platform-open-pic", &opplen
);
191 openpic_addr
= of_read_number(opprop
, naddr
);
192 printk(KERN_DEBUG
"OpenPIC addr: %lx\n", openpic_addr
);
196 BUG_ON(openpic_addr
== 0);
198 /* Setup the openpic driver */
199 mpic
= mpic_alloc(pSeries_mpic_node
, openpic_addr
,
201 16, 250, /* isu size, irq count */
203 BUG_ON(mpic
== NULL
);
206 opplen
/= sizeof(u32
);
207 for (n
= 0, i
= naddr
; i
< opplen
; i
+= naddr
, n
++) {
208 unsigned long isuaddr
= of_read_number(opprop
+ i
, naddr
);
209 mpic_assign_isu(mpic
, n
, isuaddr
);
212 /* All ISUs are setup, complete initialization */
215 /* Look for cascade */
216 for_each_node_by_type(np
, "interrupt-controller")
217 if (of_device_is_compatible(np
, "chrp,iic")) {
224 cascade_irq
= irq_of_parse_and_map(cascade
, 0);
225 if (cascade_irq
== NO_IRQ
) {
226 printk(KERN_ERR
"mpic: failed to map cascade interrupt");
231 for (old
= of_node_get(cascade
); old
!= NULL
; old
= np
) {
232 np
= of_get_parent(old
);
236 if (strcmp(np
->name
, "pci") != 0)
238 addrp
= of_get_property(np
, "8259-interrupt-acknowledge",
242 naddr
= of_n_addr_cells(np
);
243 intack
= addrp
[naddr
-1];
245 intack
|= ((unsigned long)addrp
[naddr
-2]) << 32;
248 printk(KERN_DEBUG
"mpic: PCI 8259 intack at 0x%016lx\n",
250 i8259_init(cascade
, intack
);
251 of_node_put(cascade
);
252 set_irq_chained_handler(cascade_irq
, pseries_8259_cascade
);
255 static void __init
pseries_xics_init_IRQ(void)
258 pseries_setup_i8259_cascade();
261 static void pseries_lpar_enable_pmcs(void)
263 unsigned long set
, reset
;
267 plpar_hcall_norets(H_PERFMON
, set
, reset
);
269 /* instruct hypervisor to maintain PMCs */
270 if (firmware_has_feature(FW_FEATURE_SPLPAR
))
271 get_lppaca()->pmcregs_in_use
= 1;
274 static void __init
pseries_discover_pic(void)
276 struct device_node
*np
;
279 for (np
= NULL
; (np
= of_find_node_by_name(np
,
280 "interrupt-controller"));) {
281 typep
= of_get_property(np
, "compatible", NULL
);
282 if (strstr(typep
, "open-pic")) {
283 pSeries_mpic_node
= of_node_get(np
);
284 ppc_md
.init_IRQ
= pseries_mpic_init_IRQ
;
285 ppc_md
.get_irq
= mpic_get_irq
;
286 setup_kexec_cpu_down_mpic();
287 smp_init_pseries_mpic();
289 } else if (strstr(typep
, "ppc-xicp")) {
290 ppc_md
.init_IRQ
= pseries_xics_init_IRQ
;
291 setup_kexec_cpu_down_xics();
292 smp_init_pseries_xics();
296 printk(KERN_ERR
"pSeries_discover_pic: failed to recognize"
297 " interrupt-controller\n");
300 static void __init
pSeries_setup_arch(void)
302 /* Discover PIC type and setup ppc_md accordingly */
303 pseries_discover_pic();
305 /* openpic global configuration register (64-bit format). */
306 /* openpic Interrupt Source Unit pointer (64-bit format). */
307 /* python0 facility area (mmio) (64-bit format) REAL address. */
309 /* init to some ~sane value until calibrate_delay() runs */
310 loops_per_jiffy
= 50000000;
314 /* Find and initialize PCI host bridges */
315 init_pci_config_tokens();
316 find_and_init_phbs();
319 pSeries_nvram_init();
321 /* Choose an idle loop */
322 if (firmware_has_feature(FW_FEATURE_SPLPAR
)) {
323 vpa_init(boot_cpuid
);
324 if (get_lppaca()->shared_proc
) {
325 printk(KERN_DEBUG
"Using shared processor idle loop\n");
326 ppc_md
.power_save
= pseries_shared_idle_sleep
;
328 printk(KERN_DEBUG
"Using dedicated idle loop\n");
329 ppc_md
.power_save
= pseries_dedicated_idle_sleep
;
332 printk(KERN_DEBUG
"Using default idle loop\n");
335 if (firmware_has_feature(FW_FEATURE_LPAR
))
336 ppc_md
.enable_pmcs
= pseries_lpar_enable_pmcs
;
338 ppc_md
.enable_pmcs
= power4_enable_pmcs
;
341 static int __init
pSeries_init_panel(void)
343 /* Manually leave the kernel version on the panel. */
344 ppc_md
.progress("Linux ppc64\n", 0);
345 ppc_md
.progress(init_utsname()->version
, 0);
349 arch_initcall(pSeries_init_panel
);
351 static int pseries_set_dabr(unsigned long dabr
)
353 return plpar_hcall_norets(H_SET_DABR
, dabr
);
356 static int pseries_set_xdabr(unsigned long dabr
)
358 /* We want to catch accesses from kernel and userspace */
359 return plpar_hcall_norets(H_SET_XDABR
, dabr
,
360 H_DABRX_KERNEL
| H_DABRX_USER
);
364 * Early initialization. Relocation is on but do not reference unbolted pages
366 static void __init
pSeries_init_early(void)
368 DBG(" -> pSeries_init_early()\n");
370 if (firmware_has_feature(FW_FEATURE_LPAR
))
373 if (firmware_has_feature(FW_FEATURE_DABR
))
374 ppc_md
.set_dabr
= pseries_set_dabr
;
375 else if (firmware_has_feature(FW_FEATURE_XDABR
))
376 ppc_md
.set_dabr
= pseries_set_xdabr
;
378 iommu_init_early_pSeries();
380 DBG(" <- pSeries_init_early()\n");
384 * Called very early, MMU is off, device-tree isn't unflattened
387 static int __init
pSeries_probe_hypertas(unsigned long node
,
388 const char *uname
, int depth
,
391 const char *hypertas
;
395 (strcmp(uname
, "rtas") != 0 && strcmp(uname
, "rtas@0") != 0))
398 hypertas
= of_get_flat_dt_prop(node
, "ibm,hypertas-functions", &len
);
402 powerpc_firmware_features
|= FW_FEATURE_LPAR
;
403 fw_feature_init(hypertas
, len
);
408 static int __init
pSeries_probe(void)
410 unsigned long root
= of_get_flat_dt_root();
411 char *dtype
= of_get_flat_dt_prop(root
, "device_type", NULL
);
415 if (strcmp(dtype
, "chrp"))
418 /* Cell blades firmware claims to be chrp while it's not. Until this
419 * is fixed, we need to avoid those here.
421 if (of_flat_dt_is_compatible(root
, "IBM,CPBW-1.0") ||
422 of_flat_dt_is_compatible(root
, "IBM,CBEA"))
425 DBG("pSeries detected, looking for LPAR capability...\n");
427 /* Now try to figure out if we are running on LPAR */
428 of_scan_flat_dt(pSeries_probe_hypertas
, NULL
);
430 if (firmware_has_feature(FW_FEATURE_LPAR
))
435 DBG("Machine is%s LPAR !\n",
436 (powerpc_firmware_features
& FW_FEATURE_LPAR
) ? "" : " not");
442 DECLARE_PER_CPU(unsigned long, smt_snooze_delay
);
444 static void pseries_dedicated_idle_sleep(void)
446 unsigned int cpu
= smp_processor_id();
447 unsigned long start_snooze
;
448 unsigned long in_purr
, out_purr
;
451 * Indicate to the HV that we are idle. Now would be
452 * a good time to find other work to dispatch.
454 get_lppaca()->idle
= 1;
455 get_lppaca()->donate_dedicated_cpu
= 1;
456 in_purr
= mfspr(SPRN_PURR
);
459 * We come in with interrupts disabled, and need_resched()
460 * has been checked recently. If we should poll for a little
463 if (__get_cpu_var(smt_snooze_delay
)) {
464 start_snooze
= get_tb() +
465 __get_cpu_var(smt_snooze_delay
) * tb_ticks_per_usec
;
467 set_thread_flag(TIF_POLLING_NRFLAG
);
469 while (get_tb() < start_snooze
) {
470 if (need_resched() || cpu_is_offline(cpu
))
472 ppc64_runlatch_off();
478 clear_thread_flag(TIF_POLLING_NRFLAG
);
481 if (need_resched() || cpu_is_offline(cpu
))
489 out_purr
= mfspr(SPRN_PURR
);
490 get_lppaca()->wait_state_cycles
+= out_purr
- in_purr
;
491 get_lppaca()->donate_dedicated_cpu
= 0;
492 get_lppaca()->idle
= 0;
495 static void pseries_shared_idle_sleep(void)
498 * Indicate to the HV that we are idle. Now would be
499 * a good time to find other work to dispatch.
501 get_lppaca()->idle
= 1;
504 * Yield the processor to the hypervisor. We return if
505 * an external interrupt occurs (which are driven prior
506 * to returning here) or if a prod occurs from another
507 * processor. When returning here, external interrupts
512 get_lppaca()->idle
= 0;
515 static int pSeries_pci_probe_mode(struct pci_bus
*bus
)
517 if (firmware_has_feature(FW_FEATURE_LPAR
))
518 return PCI_PROBE_DEVTREE
;
519 return PCI_PROBE_NORMAL
;
523 * pSeries_power_off - tell firmware about how to power off the system.
525 * This function calls either the power-off rtas token in normal cases
526 * or the ibm,power-off-ups token (if present & requested) in case of
527 * a power failure. If power-off token is used, power on will only be
528 * possible with power button press. If ibm,power-off-ups token is used
529 * it will allow auto poweron after power is restored.
531 void pSeries_power_off(void)
534 int rtas_poweroff_ups_token
= rtas_token("ibm,power-off-ups");
536 if (rtas_flash_term_hook
)
537 rtas_flash_term_hook(SYS_POWER_OFF
);
539 if (rtas_poweron_auto
== 0 ||
540 rtas_poweroff_ups_token
== RTAS_UNKNOWN_SERVICE
) {
541 rc
= rtas_call(rtas_token("power-off"), 2, 1, NULL
, -1, -1);
542 printk(KERN_INFO
"RTAS power-off returned %d\n", rc
);
544 rc
= rtas_call(rtas_poweroff_ups_token
, 0, 1, NULL
);
545 printk(KERN_INFO
"RTAS ibm,power-off-ups returned %d\n", rc
);
551 void pSeries_final_fixup(void) { }
554 define_machine(pseries
) {
556 .probe
= pSeries_probe
,
557 .setup_arch
= pSeries_setup_arch
,
558 .init_early
= pSeries_init_early
,
559 .show_cpuinfo
= pSeries_show_cpuinfo
,
560 .log_error
= pSeries_log_error
,
561 .pcibios_fixup
= pSeries_final_fixup
,
562 .pci_probe_mode
= pSeries_pci_probe_mode
,
563 .restart
= rtas_restart
,
564 .power_off
= pSeries_power_off
,
566 .panic
= rtas_os_term
,
567 .get_boot_time
= rtas_get_boot_time
,
568 .get_rtc_time
= rtas_get_rtc_time
,
569 .set_rtc_time
= rtas_set_rtc_time
,
570 .calibrate_decr
= generic_calibrate_decr
,
571 .progress
= rtas_progress
,
572 .system_reset_exception
= pSeries_system_reset_exception
,
573 .machine_check_exception
= pSeries_machine_check_exception
,