2 * Powermac setup and early boot code plus other random bits.
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7 * Adapted for Power Macintosh by Paul Mackerras
8 * Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
10 * Derived from "arch/alpha/kernel/setup.c"
11 * Copyright (C) 1995 Linus Torvalds
13 * Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version
18 * 2 of the License, or (at your option) any later version.
23 * bootup setup stuff..
26 #include <linux/init.h>
27 #include <linux/errno.h>
28 #include <linux/sched.h>
29 #include <linux/kernel.h>
31 #include <linux/stddef.h>
32 #include <linux/unistd.h>
33 #include <linux/ptrace.h>
34 #include <linux/slab.h>
35 #include <linux/user.h>
36 #include <linux/a.out.h>
37 #include <linux/tty.h>
38 #include <linux/string.h>
39 #include <linux/delay.h>
40 #include <linux/ioport.h>
41 #include <linux/major.h>
42 #include <linux/initrd.h>
43 #include <linux/vt_kern.h>
44 #include <linux/console.h>
45 #include <linux/pci.h>
46 #include <linux/adb.h>
47 #include <linux/cuda.h>
48 #include <linux/pmu.h>
49 #include <linux/irq.h>
50 #include <linux/seq_file.h>
51 #include <linux/root_dev.h>
52 #include <linux/bitops.h>
53 #include <linux/suspend.h>
56 #include <asm/sections.h>
58 #include <asm/system.h>
59 #include <asm/pgtable.h>
61 #include <asm/kexec.h>
62 #include <asm/pci-bridge.h>
63 #include <asm/ohare.h>
64 #include <asm/mediabay.h>
65 #include <asm/machdep.h>
67 #include <asm/cputable.h>
68 #include <asm/btext.h>
69 #include <asm/pmac_feature.h>
71 #include <asm/of_device.h>
72 #include <asm/of_platform.h>
73 #include <asm/mmu_context.h>
74 #include <asm/iommu.h>
82 #undef SHOW_GATWICK_IRQS
84 int ppc_override_l2cr
= 0;
85 int ppc_override_l2cr_value
;
90 static int current_root_goodness
= -1;
92 extern struct machdep_calls pmac_md
;
94 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
101 extern void zs_kgdb_hook(int tty_num
);
103 sys_ctrler_t sys_ctrler
= SYS_CTRLER_UNKNOWN
;
104 EXPORT_SYMBOL(sys_ctrler
);
106 #ifdef CONFIG_PMAC_SMU
107 unsigned long smu_cmdbuf_abs
;
108 EXPORT_SYMBOL(smu_cmdbuf_abs
);
112 extern struct smp_ops_t psurge_smp_ops
;
113 extern struct smp_ops_t core99_smp_ops
;
114 #endif /* CONFIG_SMP */
116 static void pmac_show_cpuinfo(struct seq_file
*m
)
118 struct device_node
*np
;
122 unsigned int mbflags
;
125 mbmodel
= pmac_call_feature(PMAC_FTR_GET_MB_INFO
, NULL
,
126 PMAC_MB_INFO_MODEL
, 0);
127 mbflags
= pmac_call_feature(PMAC_FTR_GET_MB_INFO
, NULL
,
128 PMAC_MB_INFO_FLAGS
, 0);
129 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO
, NULL
, PMAC_MB_INFO_NAME
,
130 (long) &mbname
) != 0)
133 /* find motherboard type */
134 seq_printf(m
, "machine\t\t: ");
135 np
= of_find_node_by_path("/");
137 pp
= of_get_property(np
, "model", NULL
);
139 seq_printf(m
, "%s\n", pp
);
141 seq_printf(m
, "PowerMac\n");
142 pp
= of_get_property(np
, "compatible", &plen
);
144 seq_printf(m
, "motherboard\t:");
146 int l
= strlen(pp
) + 1;
147 seq_printf(m
, " %s", pp
);
155 seq_printf(m
, "PowerMac\n");
157 /* print parsed model */
158 seq_printf(m
, "detected as\t: %d (%s)\n", mbmodel
, mbname
);
159 seq_printf(m
, "pmac flags\t: %08x\n", mbflags
);
161 /* find l2 cache info */
162 np
= of_find_node_by_name(NULL
, "l2-cache");
164 np
= of_find_node_by_type(NULL
, "cache");
166 const unsigned int *ic
=
167 of_get_property(np
, "i-cache-size", NULL
);
168 const unsigned int *dc
=
169 of_get_property(np
, "d-cache-size", NULL
);
170 seq_printf(m
, "L2 cache\t:");
172 if (of_get_property(np
, "cache-unified", NULL
) != 0 && dc
) {
173 seq_printf(m
, " %dK unified", *dc
/ 1024);
176 seq_printf(m
, " %dK instruction", *ic
/ 1024);
178 seq_printf(m
, "%s %dK data",
179 (ic
? " +": ""), *dc
/ 1024);
181 pp
= of_get_property(np
, "ram-type", NULL
);
183 seq_printf(m
, " %s", pp
);
188 /* Indicate newworld/oldworld */
189 seq_printf(m
, "pmac-generation\t: %s\n",
190 pmac_newworld
? "NewWorld" : "OldWorld");
193 #ifndef CONFIG_ADB_CUDA
194 int find_via_cuda(void)
196 struct device_node
*dn
= of_find_node_by_name(NULL
, "via-cuda");
201 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
202 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
207 #ifndef CONFIG_ADB_PMU
208 int find_via_pmu(void)
210 struct device_node
*dn
= of_find_node_by_name(NULL
, "via-pmu");
215 printk("WARNING ! Your machine is PMU-based but your kernel\n");
216 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
221 #ifndef CONFIG_PMAC_SMU
224 /* should check and warn if SMU is present */
230 static volatile u32
*sysctrl_regs
;
232 static void __init
ohare_init(void)
234 struct device_node
*dn
;
236 /* this area has the CPU identification register
237 and some registers used by smp boards */
238 sysctrl_regs
= (volatile u32
*) ioremap(0xf8000000, 0x1000);
241 * Turn on the L2 cache.
242 * We assume that we have a PSX memory controller iff
243 * we have an ohare I/O controller.
245 dn
= of_find_node_by_name(NULL
, "ohare");
248 if (((sysctrl_regs
[2] >> 24) & 0xf) >= 3) {
249 if (sysctrl_regs
[4] & 0x10)
250 sysctrl_regs
[4] |= 0x04000020;
252 sysctrl_regs
[4] |= 0x04000000;
254 printk(KERN_INFO
"Level 2 cache enabled\n");
259 static void __init
l2cr_init(void)
261 /* Checks "l2cr-value" property in the registry */
262 if (cpu_has_feature(CPU_FTR_L2CR
)) {
263 struct device_node
*np
= of_find_node_by_name(NULL
, "cpus");
265 np
= of_find_node_by_type(NULL
, "cpu");
267 const unsigned int *l2cr
=
268 of_get_property(np
, "l2cr-value", NULL
);
270 ppc_override_l2cr
= 1;
271 ppc_override_l2cr_value
= *l2cr
;
273 _set_L2CR(ppc_override_l2cr_value
);
279 if (ppc_override_l2cr
)
280 printk(KERN_INFO
"L2CR overridden (0x%x), "
281 "backside cache is %s\n",
282 ppc_override_l2cr_value
,
283 (ppc_override_l2cr_value
& 0x80000000)
284 ? "enabled" : "disabled");
288 static void __init
pmac_setup_arch(void)
290 struct device_node
*cpu
, *ic
;
294 pvr
= PVR_VER(mfspr(SPRN_PVR
));
296 /* Set loops_per_jiffy to a half-way reasonable value,
297 for use until calibrate_delay gets called. */
298 loops_per_jiffy
= 50000000 / HZ
;
299 cpu
= of_find_node_by_type(NULL
, "cpu");
301 fp
= of_get_property(cpu
, "clock-frequency", NULL
);
303 if (pvr
>= 0x30 && pvr
< 0x80)
305 loops_per_jiffy
= *fp
/ (3 * HZ
);
306 else if (pvr
== 4 || pvr
>= 8)
307 /* 604, G3, G4 etc. */
308 loops_per_jiffy
= *fp
/ HZ
;
311 loops_per_jiffy
= *fp
/ (2 * HZ
);
316 /* See if newworld or oldworld */
317 for (ic
= NULL
; (ic
= of_find_all_nodes(ic
)) != NULL
; )
318 if (of_get_property(ic
, "interrupt-controller", NULL
))
325 /* Lookup PCI hosts */
331 #endif /* CONFIG_PPC32 */
341 #if defined(CONFIG_NVRAM) || defined(CONFIG_PPC64)
346 #ifdef CONFIG_BLK_DEV_INITRD
348 ROOT_DEV
= Root_RAM0
;
351 ROOT_DEV
= DEFAULT_ROOT_DEVICE
;
355 /* Check for Core99 */
356 ic
= of_find_node_by_name(NULL
, "uni-n");
358 ic
= of_find_node_by_name(NULL
, "u3");
360 ic
= of_find_node_by_name(NULL
, "u4");
363 smp_ops
= &core99_smp_ops
;
368 * We have to set bits in cpu_possible_map here since the
369 * secondary CPU(s) aren't in the device tree, and
370 * setup_per_cpu_areas only allocates per-cpu data for
371 * CPUs in the cpu_possible_map.
375 for (cpu
= 1; cpu
< 4 && cpu
< NR_CPUS
; ++cpu
)
376 cpu_set(cpu
, cpu_possible_map
);
377 smp_ops
= &psurge_smp_ops
;
380 #endif /* CONFIG_SMP */
383 if (strstr(cmd_line
, "adb_sync")) {
384 extern int __adb_probe_sync
;
385 __adb_probe_sync
= 1;
387 #endif /* CONFIG_ADB */
395 static dev_t boot_dev
;
398 void note_scsi_host(struct device_node
*node
, void *host
)
403 l
= strlen(node
->full_name
);
404 if (bootpath
!= NULL
&& bootdevice
!= NULL
405 && strncmp(node
->full_name
, bootdevice
, l
) == 0
406 && (bootdevice
[l
] == '/' || bootdevice
[l
] == 0)) {
409 * There's a bug in OF 1.0.5. (Why am I not surprised.)
410 * If you pass a path like scsi/sd@1:0 to canon, it returns
411 * something like /bandit@F2000000/gc@10/53c94@10000/sd@0,0
412 * That is, the scsi target number doesn't get preserved.
413 * So we pick the target number out of bootpath and use that.
415 p
= strstr(bootpath
, "/sd@");
418 boot_target
= simple_strtoul(p
, NULL
, 10);
421 boot_part
= simple_strtoul(p
+ 1, NULL
, 10);
425 EXPORT_SYMBOL(note_scsi_host
);
428 #if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
429 static dev_t __init
find_ide_boot(void)
433 dev_t __init
pmac_find_ide_boot(char *bootdevice
, int n
);
435 if (bootdevice
== NULL
)
437 p
= strrchr(bootdevice
, '/');
442 return pmac_find_ide_boot(bootdevice
, n
);
444 #endif /* CONFIG_BLK_DEV_IDE && CONFIG_BLK_DEV_IDE_PMAC */
446 static void __init
find_boot_device(void)
448 #if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
449 boot_dev
= find_ide_boot();
453 static int initializing
= 1;
455 static int pmac_late_init(void)
457 if (!machine_is(powermac
))
461 /* this is udbg (which is __init) and we can later use it during
462 * cpu hotplug (in smp_core99_kick_cpu) */
463 ppc_md
.progress
= NULL
;
467 late_initcall(pmac_late_init
);
469 /* can't be __init - can be called whenever a disk is first accessed */
470 void note_bootable_part(dev_t dev
, int part
, int goodness
)
472 static int found_boot
= 0;
477 if ((goodness
<= current_root_goodness
) &&
478 ROOT_DEV
!= DEFAULT_ROOT_DEVICE
)
480 p
= strstr(boot_command_line
, "root=");
481 if (p
!= NULL
&& (p
== boot_command_line
|| p
[-1] == ' '))
488 if (!boot_dev
|| dev
== boot_dev
) {
489 ROOT_DEV
= dev
+ part
;
491 current_root_goodness
= goodness
;
495 #ifdef CONFIG_ADB_CUDA
496 static void cuda_restart(void)
498 struct adb_request req
;
500 cuda_request(&req
, NULL
, 2, CUDA_PACKET
, CUDA_RESET_SYSTEM
);
505 static void cuda_shutdown(void)
507 struct adb_request req
;
509 cuda_request(&req
, NULL
, 2, CUDA_PACKET
, CUDA_POWERDOWN
);
515 #define cuda_restart()
516 #define cuda_shutdown()
519 #ifndef CONFIG_ADB_PMU
520 #define pmu_restart()
521 #define pmu_shutdown()
524 #ifndef CONFIG_PMAC_SMU
525 #define smu_restart()
526 #define smu_shutdown()
529 static void pmac_restart(char *cmd
)
531 switch (sys_ctrler
) {
532 case SYS_CTRLER_CUDA
:
545 static void pmac_power_off(void)
547 switch (sys_ctrler
) {
548 case SYS_CTRLER_CUDA
:
568 * Early initialization.
570 static void __init
pmac_init_early(void)
572 /* Enable early btext debug if requested */
573 if (strstr(cmd_line
, "btextdbg")) {
574 udbg_adb_init_early();
575 register_early_udbg_console();
578 /* Probe motherboard chipset */
581 /* Initialize debug stuff */
582 udbg_scc_init(!!strstr(cmd_line
, "sccdbg"));
583 udbg_adb_init(!!strstr(cmd_line
, "btextdbg"));
586 iommu_init_early_dart();
590 static int __init
pmac_declare_of_platform_devices(void)
592 struct device_node
*np
;
594 if (machine_is(chrp
))
597 if (!machine_is(powermac
))
600 np
= of_find_node_by_name(NULL
, "valkyrie");
602 of_platform_device_create(np
, "valkyrie", NULL
);
603 np
= of_find_node_by_name(NULL
, "platinum");
605 of_platform_device_create(np
, "platinum", NULL
);
606 np
= of_find_node_by_type(NULL
, "smu");
608 of_platform_device_create(np
, "smu", NULL
);
615 device_initcall(pmac_declare_of_platform_devices
);
618 * Called very early, MMU is off, device-tree isn't unflattened
620 static int __init
pmac_probe(void)
622 unsigned long root
= of_get_flat_dt_root();
624 if (!of_flat_dt_is_compatible(root
, "Power Macintosh") &&
625 !of_flat_dt_is_compatible(root
, "MacRISC"))
630 * On U3, the DART (iommu) must be allocated now since it
631 * has an impact on htab_initialize (due to the large page it
632 * occupies having to be broken up so the DART itself is not
633 * part of the cacheable linar mapping
641 /* isa_io_base gets set in pmac_pci_init */
642 ISA_DMA_THRESHOLD
= ~0L;
646 #if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
647 #ifdef CONFIG_BLK_DEV_IDE_PMAC
648 ppc_ide_md
.ide_init_hwif
= pmac_ide_init_hwif_ports
;
649 ppc_ide_md
.default_io_base
= pmac_ide_get_base
;
650 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
651 #endif /* defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE) */
653 #endif /* CONFIG_PPC32 */
655 #ifdef CONFIG_PMAC_SMU
657 * SMU based G5s need some memory below 2Gb, at least the current
658 * driver needs that. We have to allocate it now. We allocate 4k
659 * (1 small page) for now.
661 smu_cmdbuf_abs
= lmb_alloc_base(4096, 4096, 0x80000000UL
);
662 #endif /* CONFIG_PMAC_SMU */
668 /* Move that to pci.c */
669 static int pmac_pci_probe_mode(struct pci_bus
*bus
)
671 struct device_node
*node
= bus
->sysdata
;
673 /* We need to use normal PCI probing for the AGP bus,
674 * since the device for the AGP bridge isn't in the tree.
676 if (bus
->self
== NULL
&& (of_device_is_compatible(node
, "u3-agp") ||
677 of_device_is_compatible(node
, "u4-pcie")))
678 return PCI_PROBE_NORMAL
;
679 return PCI_PROBE_DEVTREE
;
682 #ifdef CONFIG_HOTPLUG_CPU
683 /* access per cpu vars from generic smp.c */
684 DECLARE_PER_CPU(int, cpu_state
);
686 static void pmac_cpu_die(void)
689 * turn off as much as possible, we'll be
690 * kicked out as this will only be invoked
691 * on core99 platforms for now ...
694 printk(KERN_INFO
"CPU#%d offline\n", smp_processor_id());
695 __get_cpu_var(cpu_state
) = CPU_DEAD
;
699 * during the path that leads here preemption is disabled,
700 * reenable it now so that when coming up preempt count is
706 * hard-disable interrupts for the non-NAP case, the NAP code
707 * needs to re-enable interrupts (but soft-disables them)
712 /* let's not take timer interrupts too often ... */
715 /* should always be true at this point */
716 if (cpu_has_feature(CPU_FTR_CAN_NAP
))
717 power4_cpu_offline_powersave();
724 #endif /* CONFIG_HOTPLUG_CPU */
726 #endif /* CONFIG_PPC64 */
728 define_machine(powermac
) {
731 .setup_arch
= pmac_setup_arch
,
732 .init_early
= pmac_init_early
,
733 .show_cpuinfo
= pmac_show_cpuinfo
,
734 .init_IRQ
= pmac_pic_init
,
735 .get_irq
= NULL
, /* changed later */
736 .pci_irq_fixup
= pmac_pci_irq_fixup
,
737 .restart
= pmac_restart
,
738 .power_off
= pmac_power_off
,
740 .time_init
= pmac_time_init
,
741 .get_boot_time
= pmac_get_boot_time
,
742 .set_rtc_time
= pmac_set_rtc_time
,
743 .get_rtc_time
= pmac_get_rtc_time
,
744 .calibrate_decr
= pmac_calibrate_decr
,
745 .feature_call
= pmac_do_feature_call
,
746 .progress
= udbg_progress
,
748 .pci_probe_mode
= pmac_pci_probe_mode
,
749 .power_save
= power4_idle
,
750 .enable_pmcs
= power4_enable_pmcs
,
752 .machine_kexec
= default_machine_kexec
,
753 .machine_kexec_prepare
= default_machine_kexec_prepare
,
754 .machine_crash_shutdown
= default_machine_crash_shutdown
,
756 #endif /* CONFIG_PPC64 */
758 .pcibios_enable_device_hook
= pmac_pci_enable_device_hook
,
759 .pcibios_after_init
= pmac_pcibios_after_init
,
760 .phys_mem_access_prot
= pci_phys_mem_access_prot
,
762 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
763 .cpu_die
= pmac_cpu_die
,