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>
58 #include <asm/kexec.h>
60 #include <asm/nvram.h>
64 #include <asm/ppc-pci.h>
65 #include <asm/i8259.h>
68 #include <asm/firmware.h>
70 #include "plpar_wrappers.h"
74 #define DBG(fmt...) udbg_printf(fmt)
79 /* move those away to a .h */
80 extern void smp_init_pseries_mpic(void);
81 extern void smp_init_pseries_xics(void);
82 extern void find_udbg_vterm(void);
84 int fwnmi_active
; /* TRUE if an FWNMI handler is present */
86 static void pseries_shared_idle_sleep(void);
87 static void pseries_dedicated_idle_sleep(void);
89 static struct device_node
*pSeries_mpic_node
;
91 static void pSeries_show_cpuinfo(struct seq_file
*m
)
93 struct device_node
*root
;
94 const char *model
= "";
96 root
= of_find_node_by_path("/");
98 model
= get_property(root
, "model", NULL
);
99 seq_printf(m
, "machine\t\t: CHRP %s\n", model
);
103 /* Initialize firmware assisted non-maskable interrupts if
104 * the firmware supports this feature.
106 static void __init
fwnmi_init(void)
108 unsigned long system_reset_addr
, machine_check_addr
;
110 int ibm_nmi_register
= rtas_token("ibm,nmi-register");
111 if (ibm_nmi_register
== RTAS_UNKNOWN_SERVICE
)
114 /* If the kernel's not linked at zero we point the firmware at low
115 * addresses anyway, and use a trampoline to get to the real code. */
116 system_reset_addr
= __pa(system_reset_fwnmi
) - PHYSICAL_START
;
117 machine_check_addr
= __pa(machine_check_fwnmi
) - PHYSICAL_START
;
119 if (0 == rtas_call(ibm_nmi_register
, 2, 1, NULL
, system_reset_addr
,
124 void pseries_8259_cascade(unsigned int irq
, struct irq_desc
*desc
)
126 unsigned int cascade_irq
= i8259_irq();
127 if (cascade_irq
!= NO_IRQ
)
128 generic_handle_irq(cascade_irq
);
129 desc
->chip
->eoi(irq
);
132 static void __init
pseries_mpic_init_IRQ(void)
134 struct device_node
*np
, *old
, *cascade
= NULL
;
135 const unsigned int *addrp
;
136 unsigned long intack
= 0;
137 const unsigned int *opprop
;
138 unsigned long openpic_addr
= 0;
139 unsigned int cascade_irq
;
140 int naddr
, n
, i
, opplen
;
143 np
= of_find_node_by_path("/");
144 naddr
= prom_n_addr_cells(np
);
145 opprop
= get_property(np
, "platform-open-pic", &opplen
);
147 openpic_addr
= of_read_number(opprop
, naddr
);
148 printk(KERN_DEBUG
"OpenPIC addr: %lx\n", openpic_addr
);
152 BUG_ON(openpic_addr
== 0);
154 /* Setup the openpic driver */
155 mpic
= mpic_alloc(pSeries_mpic_node
, openpic_addr
,
157 16, 250, /* isu size, irq count */
159 BUG_ON(mpic
== NULL
);
162 opplen
/= sizeof(u32
);
163 for (n
= 0, i
= naddr
; i
< opplen
; i
+= naddr
, n
++) {
164 unsigned long isuaddr
= of_read_number(opprop
+ i
, naddr
);
165 mpic_assign_isu(mpic
, n
, isuaddr
);
168 /* All ISUs are setup, complete initialization */
171 /* Look for cascade */
172 for_each_node_by_type(np
, "interrupt-controller")
173 if (device_is_compatible(np
, "chrp,iic")) {
180 cascade_irq
= irq_of_parse_and_map(cascade
, 0);
181 if (cascade
== NO_IRQ
) {
182 printk(KERN_ERR
"mpic: failed to map cascade interrupt");
187 for (old
= of_node_get(cascade
); old
!= NULL
; old
= np
) {
188 np
= of_get_parent(old
);
192 if (strcmp(np
->name
, "pci") != 0)
194 addrp
= get_property(np
, "8259-interrupt-acknowledge",
198 naddr
= prom_n_addr_cells(np
);
199 intack
= addrp
[naddr
-1];
201 intack
|= ((unsigned long)addrp
[naddr
-2]) << 32;
204 printk(KERN_DEBUG
"mpic: PCI 8259 intack at 0x%016lx\n",
206 i8259_init(cascade
, intack
);
207 of_node_put(cascade
);
208 set_irq_chained_handler(cascade_irq
, pseries_8259_cascade
);
211 static void pseries_lpar_enable_pmcs(void)
213 unsigned long set
, reset
;
217 plpar_hcall_norets(H_PERFMON
, set
, reset
);
219 /* instruct hypervisor to maintain PMCs */
220 if (firmware_has_feature(FW_FEATURE_SPLPAR
))
221 get_lppaca()->pmcregs_in_use
= 1;
225 static void pseries_kexec_cpu_down(int crash_shutdown
, int secondary
)
227 /* Don't risk a hypervisor call if we're crashing */
228 if (firmware_has_feature(FW_FEATURE_SPLPAR
) && !crash_shutdown
) {
231 addr
= __pa(get_slb_shadow());
232 if (unregister_slb_shadow(hard_smp_processor_id(), addr
))
233 printk("SLB shadow buffer deregistration of "
234 "cpu %u (hw_cpu_id %d) failed\n",
236 hard_smp_processor_id());
238 addr
= __pa(get_lppaca());
239 if (unregister_vpa(hard_smp_processor_id(), addr
)) {
240 printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
241 "failed\n", smp_processor_id(),
242 hard_smp_processor_id());
247 static void pseries_kexec_cpu_down_mpic(int crash_shutdown
, int secondary
)
249 pseries_kexec_cpu_down(crash_shutdown
, secondary
);
250 mpic_teardown_this_cpu(secondary
);
253 static void pseries_kexec_cpu_down_xics(int crash_shutdown
, int secondary
)
255 pseries_kexec_cpu_down(crash_shutdown
, secondary
);
256 xics_teardown_cpu(secondary
);
258 #endif /* CONFIG_KEXEC */
260 static void __init
pseries_discover_pic(void)
262 struct device_node
*np
;
265 for (np
= NULL
; (np
= of_find_node_by_name(np
,
266 "interrupt-controller"));) {
267 typep
= get_property(np
, "compatible", NULL
);
268 if (strstr(typep
, "open-pic")) {
269 pSeries_mpic_node
= of_node_get(np
);
270 ppc_md
.init_IRQ
= pseries_mpic_init_IRQ
;
271 ppc_md
.get_irq
= mpic_get_irq
;
273 ppc_md
.kexec_cpu_down
= pseries_kexec_cpu_down_mpic
;
276 smp_init_pseries_mpic();
279 } else if (strstr(typep
, "ppc-xicp")) {
280 ppc_md
.init_IRQ
= xics_init_IRQ
;
282 ppc_md
.kexec_cpu_down
= pseries_kexec_cpu_down_xics
;
285 smp_init_pseries_xics();
290 printk(KERN_ERR
"pSeries_discover_pic: failed to recognize"
291 " interrupt-controller\n");
294 static void __init
pSeries_setup_arch(void)
296 /* Discover PIC type and setup ppc_md accordingly */
297 pseries_discover_pic();
299 /* openpic global configuration register (64-bit format). */
300 /* openpic Interrupt Source Unit pointer (64-bit format). */
301 /* python0 facility area (mmio) (64-bit format) REAL address. */
303 /* init to some ~sane value until calibrate_delay() runs */
304 loops_per_jiffy
= 50000000;
307 printk("No ramdisk, default root is /dev/sda2\n");
308 ROOT_DEV
= Root_SDA2
;
313 /* Find and initialize PCI host bridges */
314 init_pci_config_tokens();
315 find_and_init_phbs();
318 pSeries_nvram_init();
320 /* Choose an idle loop */
321 if (firmware_has_feature(FW_FEATURE_SPLPAR
)) {
322 vpa_init(boot_cpuid
);
323 if (get_lppaca()->shared_proc
) {
324 printk(KERN_DEBUG
"Using shared processor idle loop\n");
325 ppc_md
.power_save
= pseries_shared_idle_sleep
;
327 printk(KERN_DEBUG
"Using dedicated idle loop\n");
328 ppc_md
.power_save
= pseries_dedicated_idle_sleep
;
331 printk(KERN_DEBUG
"Using default idle loop\n");
334 if (firmware_has_feature(FW_FEATURE_LPAR
))
335 ppc_md
.enable_pmcs
= pseries_lpar_enable_pmcs
;
337 ppc_md
.enable_pmcs
= power4_enable_pmcs
;
340 static int __init
pSeries_init_panel(void)
342 /* Manually leave the kernel version on the panel. */
343 ppc_md
.progress("Linux ppc64\n", 0);
344 ppc_md
.progress(init_utsname()->version
, 0);
348 arch_initcall(pSeries_init_panel
);
350 static int pseries_set_dabr(unsigned long dabr
)
352 return plpar_hcall_norets(H_SET_DABR
, dabr
);
355 static int pseries_set_xdabr(unsigned long dabr
)
357 /* We want to catch accesses from kernel and userspace */
358 return plpar_hcall_norets(H_SET_XDABR
, dabr
,
359 H_DABRX_KERNEL
| H_DABRX_USER
);
363 * Early initialization. Relocation is on but do not reference unbolted pages
365 static void __init
pSeries_init_early(void)
367 DBG(" -> pSeries_init_early()\n");
371 if (firmware_has_feature(FW_FEATURE_LPAR
))
374 if (firmware_has_feature(FW_FEATURE_DABR
))
375 ppc_md
.set_dabr
= pseries_set_dabr
;
376 else if (firmware_has_feature(FW_FEATURE_XDABR
))
377 ppc_md
.set_dabr
= pseries_set_xdabr
;
379 iommu_init_early_pSeries();
381 DBG(" <- pSeries_init_early()\n");
385 static int pSeries_check_legacy_ioport(unsigned int baseport
)
387 struct device_node
*np
;
389 #define I8042_DATA_REG 0x60
390 #define FDC_BASE 0x3f0
395 np
= of_find_node_by_type(NULL
, "8042");
401 np
= of_find_node_by_type(NULL
, "fdc");
411 * Called very early, MMU is off, device-tree isn't unflattened
414 static int __init
pSeries_probe_hypertas(unsigned long node
,
415 const char *uname
, int depth
,
419 (strcmp(uname
, "rtas") != 0 && strcmp(uname
, "rtas@0") != 0))
422 if (of_get_flat_dt_prop(node
, "ibm,hypertas-functions", NULL
) != NULL
)
423 powerpc_firmware_features
|= FW_FEATURE_LPAR
;
428 static int __init
pSeries_probe(void)
430 unsigned long root
= of_get_flat_dt_root();
431 char *dtype
= of_get_flat_dt_prop(root
, "device_type", NULL
);
435 if (strcmp(dtype
, "chrp"))
438 /* Cell blades firmware claims to be chrp while it's not. Until this
439 * is fixed, we need to avoid those here.
441 if (of_flat_dt_is_compatible(root
, "IBM,CPBW-1.0") ||
442 of_flat_dt_is_compatible(root
, "IBM,CBEA"))
445 DBG("pSeries detected, looking for LPAR capability...\n");
447 /* Now try to figure out if we are running on LPAR */
448 of_scan_flat_dt(pSeries_probe_hypertas
, NULL
);
450 if (firmware_has_feature(FW_FEATURE_LPAR
))
455 DBG("Machine is%s LPAR !\n",
456 (powerpc_firmware_features
& FW_FEATURE_LPAR
) ? "" : " not");
462 DECLARE_PER_CPU(unsigned long, smt_snooze_delay
);
464 static void pseries_dedicated_idle_sleep(void)
466 unsigned int cpu
= smp_processor_id();
467 unsigned long start_snooze
;
470 * Indicate to the HV that we are idle. Now would be
471 * a good time to find other work to dispatch.
473 get_lppaca()->idle
= 1;
476 * We come in with interrupts disabled, and need_resched()
477 * has been checked recently. If we should poll for a little
480 if (__get_cpu_var(smt_snooze_delay
)) {
481 start_snooze
= get_tb() +
482 __get_cpu_var(smt_snooze_delay
) * tb_ticks_per_usec
;
484 set_thread_flag(TIF_POLLING_NRFLAG
);
486 while (get_tb() < start_snooze
) {
487 if (need_resched() || cpu_is_offline(cpu
))
489 ppc64_runlatch_off();
495 clear_thread_flag(TIF_POLLING_NRFLAG
);
498 if (need_resched() || cpu_is_offline(cpu
))
506 get_lppaca()->idle
= 0;
509 static void pseries_shared_idle_sleep(void)
512 * Indicate to the HV that we are idle. Now would be
513 * a good time to find other work to dispatch.
515 get_lppaca()->idle
= 1;
518 * Yield the processor to the hypervisor. We return if
519 * an external interrupt occurs (which are driven prior
520 * to returning here) or if a prod occurs from another
521 * processor. When returning here, external interrupts
526 get_lppaca()->idle
= 0;
529 static int pSeries_pci_probe_mode(struct pci_bus
*bus
)
531 if (firmware_has_feature(FW_FEATURE_LPAR
))
532 return PCI_PROBE_DEVTREE
;
533 return PCI_PROBE_NORMAL
;
536 define_machine(pseries
) {
538 .probe
= pSeries_probe
,
539 .setup_arch
= pSeries_setup_arch
,
540 .init_early
= pSeries_init_early
,
541 .show_cpuinfo
= pSeries_show_cpuinfo
,
542 .log_error
= pSeries_log_error
,
543 .pcibios_fixup
= pSeries_final_fixup
,
544 .pci_probe_mode
= pSeries_pci_probe_mode
,
545 .restart
= rtas_restart
,
546 .power_off
= rtas_power_off
,
548 .panic
= rtas_os_term
,
549 .get_boot_time
= rtas_get_boot_time
,
550 .get_rtc_time
= rtas_get_rtc_time
,
551 .set_rtc_time
= rtas_set_rtc_time
,
552 .calibrate_decr
= generic_calibrate_decr
,
553 .progress
= rtas_progress
,
554 .check_legacy_ioport
= pSeries_check_legacy_ioport
,
555 .system_reset_exception
= pSeries_system_reset_exception
,
556 .machine_check_exception
= pSeries_machine_check_exception
,
558 .machine_kexec
= default_machine_kexec
,
559 .machine_kexec_prepare
= default_machine_kexec_prepare
,
560 .machine_crash_shutdown
= default_machine_crash_shutdown
,