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/tty.h>
37 #include <linux/string.h>
38 #include <linux/delay.h>
39 #include <linux/ioport.h>
40 #include <linux/major.h>
41 #include <linux/initrd.h>
42 #include <linux/vt_kern.h>
43 #include <linux/console.h>
44 #include <linux/pci.h>
45 #include <linux/adb.h>
46 #include <linux/cuda.h>
47 #include <linux/pmu.h>
48 #include <linux/irq.h>
49 #include <linux/seq_file.h>
50 #include <linux/root_dev.h>
51 #include <linux/bitops.h>
52 #include <linux/suspend.h>
53 #include <linux/of_device.h>
54 #include <linux/of_platform.h>
55 #include <linux/lmb.h>
58 #include <asm/sections.h>
60 #include <asm/system.h>
61 #include <asm/pgtable.h>
63 #include <asm/pci-bridge.h>
64 #include <asm/ohare.h>
65 #include <asm/mediabay.h>
66 #include <asm/machdep.h>
68 #include <asm/cputable.h>
69 #include <asm/btext.h>
70 #include <asm/pmac_feature.h>
72 #include <asm/mmu_context.h>
73 #include <asm/iommu.h>
80 #undef SHOW_GATWICK_IRQS
82 int ppc_override_l2cr
= 0;
83 int ppc_override_l2cr_value
;
88 static int current_root_goodness
= -1;
90 extern struct machdep_calls pmac_md
;
92 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
98 sys_ctrler_t sys_ctrler
= SYS_CTRLER_UNKNOWN
;
99 EXPORT_SYMBOL(sys_ctrler
);
101 #ifdef CONFIG_PMAC_SMU
102 unsigned long smu_cmdbuf_abs
;
103 EXPORT_SYMBOL(smu_cmdbuf_abs
);
106 static void pmac_show_cpuinfo(struct seq_file
*m
)
108 struct device_node
*np
;
112 unsigned int mbflags
;
115 mbmodel
= pmac_call_feature(PMAC_FTR_GET_MB_INFO
, NULL
,
116 PMAC_MB_INFO_MODEL
, 0);
117 mbflags
= pmac_call_feature(PMAC_FTR_GET_MB_INFO
, NULL
,
118 PMAC_MB_INFO_FLAGS
, 0);
119 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO
, NULL
, PMAC_MB_INFO_NAME
,
120 (long) &mbname
) != 0)
123 /* find motherboard type */
124 seq_printf(m
, "machine\t\t: ");
125 np
= of_find_node_by_path("/");
127 pp
= of_get_property(np
, "model", NULL
);
129 seq_printf(m
, "%s\n", pp
);
131 seq_printf(m
, "PowerMac\n");
132 pp
= of_get_property(np
, "compatible", &plen
);
134 seq_printf(m
, "motherboard\t:");
136 int l
= strlen(pp
) + 1;
137 seq_printf(m
, " %s", pp
);
145 seq_printf(m
, "PowerMac\n");
147 /* print parsed model */
148 seq_printf(m
, "detected as\t: %d (%s)\n", mbmodel
, mbname
);
149 seq_printf(m
, "pmac flags\t: %08x\n", mbflags
);
151 /* find l2 cache info */
152 np
= of_find_node_by_name(NULL
, "l2-cache");
154 np
= of_find_node_by_type(NULL
, "cache");
156 const unsigned int *ic
=
157 of_get_property(np
, "i-cache-size", NULL
);
158 const unsigned int *dc
=
159 of_get_property(np
, "d-cache-size", NULL
);
160 seq_printf(m
, "L2 cache\t:");
162 if (of_get_property(np
, "cache-unified", NULL
) != 0 && dc
) {
163 seq_printf(m
, " %dK unified", *dc
/ 1024);
166 seq_printf(m
, " %dK instruction", *ic
/ 1024);
168 seq_printf(m
, "%s %dK data",
169 (ic
? " +": ""), *dc
/ 1024);
171 pp
= of_get_property(np
, "ram-type", NULL
);
173 seq_printf(m
, " %s", pp
);
178 /* Indicate newworld/oldworld */
179 seq_printf(m
, "pmac-generation\t: %s\n",
180 pmac_newworld
? "NewWorld" : "OldWorld");
183 #ifndef CONFIG_ADB_CUDA
184 int find_via_cuda(void)
186 struct device_node
*dn
= of_find_node_by_name(NULL
, "via-cuda");
191 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
192 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
197 #ifndef CONFIG_ADB_PMU
198 int find_via_pmu(void)
200 struct device_node
*dn
= of_find_node_by_name(NULL
, "via-pmu");
205 printk("WARNING ! Your machine is PMU-based but your kernel\n");
206 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
211 #ifndef CONFIG_PMAC_SMU
214 /* should check and warn if SMU is present */
220 static volatile u32
*sysctrl_regs
;
222 static void __init
ohare_init(void)
224 struct device_node
*dn
;
226 /* this area has the CPU identification register
227 and some registers used by smp boards */
228 sysctrl_regs
= (volatile u32
*) ioremap(0xf8000000, 0x1000);
231 * Turn on the L2 cache.
232 * We assume that we have a PSX memory controller iff
233 * we have an ohare I/O controller.
235 dn
= of_find_node_by_name(NULL
, "ohare");
238 if (((sysctrl_regs
[2] >> 24) & 0xf) >= 3) {
239 if (sysctrl_regs
[4] & 0x10)
240 sysctrl_regs
[4] |= 0x04000020;
242 sysctrl_regs
[4] |= 0x04000000;
244 printk(KERN_INFO
"Level 2 cache enabled\n");
249 static void __init
l2cr_init(void)
251 /* Checks "l2cr-value" property in the registry */
252 if (cpu_has_feature(CPU_FTR_L2CR
)) {
253 struct device_node
*np
= of_find_node_by_name(NULL
, "cpus");
255 np
= of_find_node_by_type(NULL
, "cpu");
257 const unsigned int *l2cr
=
258 of_get_property(np
, "l2cr-value", NULL
);
260 ppc_override_l2cr
= 1;
261 ppc_override_l2cr_value
= *l2cr
;
263 _set_L2CR(ppc_override_l2cr_value
);
269 if (ppc_override_l2cr
)
270 printk(KERN_INFO
"L2CR overridden (0x%x), "
271 "backside cache is %s\n",
272 ppc_override_l2cr_value
,
273 (ppc_override_l2cr_value
& 0x80000000)
274 ? "enabled" : "disabled");
278 static void __init
pmac_setup_arch(void)
280 struct device_node
*cpu
, *ic
;
284 pvr
= PVR_VER(mfspr(SPRN_PVR
));
286 /* Set loops_per_jiffy to a half-way reasonable value,
287 for use until calibrate_delay gets called. */
288 loops_per_jiffy
= 50000000 / HZ
;
289 cpu
= of_find_node_by_type(NULL
, "cpu");
291 fp
= of_get_property(cpu
, "clock-frequency", NULL
);
293 if (pvr
>= 0x30 && pvr
< 0x80)
295 loops_per_jiffy
= *fp
/ (3 * HZ
);
296 else if (pvr
== 4 || pvr
>= 8)
297 /* 604, G3, G4 etc. */
298 loops_per_jiffy
= *fp
/ HZ
;
301 loops_per_jiffy
= *fp
/ (2 * HZ
);
306 /* See if newworld or oldworld */
307 ic
= of_find_node_with_property(NULL
, "interrupt-controller");
313 /* Lookup PCI hosts */
319 #endif /* CONFIG_PPC32 */
325 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
326 defined(CONFIG_PPC64)
331 #ifdef CONFIG_BLK_DEV_INITRD
333 ROOT_DEV
= Root_RAM0
;
336 ROOT_DEV
= DEFAULT_ROOT_DEVICE
;
340 if (strstr(cmd_line
, "adb_sync")) {
341 extern int __adb_probe_sync
;
342 __adb_probe_sync
= 1;
344 #endif /* CONFIG_ADB */
348 void note_scsi_host(struct device_node
*node
, void *host
)
351 EXPORT_SYMBOL(note_scsi_host
);
354 static int initializing
= 1;
356 static int pmac_late_init(void)
359 /* this is udbg (which is __init) and we can later use it during
360 * cpu hotplug (in smp_core99_kick_cpu) */
361 ppc_md
.progress
= NULL
;
364 machine_late_initcall(powermac
, pmac_late_init
);
367 * This is __init_refok because we check for "initializing" before
368 * touching any of the __init sensitive things and "initializing"
369 * will be false after __init time. This can't be __init because it
370 * can be called whenever a disk is first accessed.
372 void __init_refok
note_bootable_part(dev_t dev
, int part
, int goodness
)
378 if ((goodness
<= current_root_goodness
) &&
379 ROOT_DEV
!= DEFAULT_ROOT_DEVICE
)
381 p
= strstr(boot_command_line
, "root=");
382 if (p
!= NULL
&& (p
== boot_command_line
|| p
[-1] == ' '))
385 ROOT_DEV
= dev
+ part
;
386 current_root_goodness
= goodness
;
389 #ifdef CONFIG_ADB_CUDA
390 static void cuda_restart(void)
392 struct adb_request req
;
394 cuda_request(&req
, NULL
, 2, CUDA_PACKET
, CUDA_RESET_SYSTEM
);
399 static void cuda_shutdown(void)
401 struct adb_request req
;
403 cuda_request(&req
, NULL
, 2, CUDA_PACKET
, CUDA_POWERDOWN
);
409 #define cuda_restart()
410 #define cuda_shutdown()
413 #ifndef CONFIG_ADB_PMU
414 #define pmu_restart()
415 #define pmu_shutdown()
418 #ifndef CONFIG_PMAC_SMU
419 #define smu_restart()
420 #define smu_shutdown()
423 static void pmac_restart(char *cmd
)
425 switch (sys_ctrler
) {
426 case SYS_CTRLER_CUDA
:
439 static void pmac_power_off(void)
441 switch (sys_ctrler
) {
442 case SYS_CTRLER_CUDA
:
462 * Early initialization.
464 static void __init
pmac_init_early(void)
466 /* Enable early btext debug if requested */
467 if (strstr(cmd_line
, "btextdbg")) {
468 udbg_adb_init_early();
469 register_early_udbg_console();
472 /* Probe motherboard chipset */
475 /* Initialize debug stuff */
476 udbg_scc_init(!!strstr(cmd_line
, "sccdbg"));
477 udbg_adb_init(!!strstr(cmd_line
, "btextdbg"));
480 iommu_init_early_dart();
483 /* SMP Init has to be done early as we need to patch up
484 * cpu_possible_map before interrupt stacks are allocated
492 static int __init
pmac_declare_of_platform_devices(void)
494 struct device_node
*np
;
496 if (machine_is(chrp
))
499 np
= of_find_node_by_name(NULL
, "valkyrie");
501 of_platform_device_create(np
, "valkyrie", NULL
);
502 np
= of_find_node_by_name(NULL
, "platinum");
504 of_platform_device_create(np
, "platinum", NULL
);
505 np
= of_find_node_by_type(NULL
, "smu");
507 of_platform_device_create(np
, "smu", NULL
);
513 machine_device_initcall(powermac
, pmac_declare_of_platform_devices
);
515 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
517 * This is called very early, as part of console_init() (typically just after
518 * time_init()). This function is respondible for trying to find a good
519 * default console on serial ports. It tries to match the open firmware
520 * default output with one of the available serial console drivers.
522 static int __init
check_pmac_serial_console(void)
524 struct device_node
*prom_stdout
= NULL
;
527 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
528 char *devname
= "ttyS";
530 char *devname
= "ttyPZ";
533 pr_debug(" -> check_pmac_serial_console()\n");
535 /* The user has requested a console so this is already set up. */
536 if (strstr(boot_command_line
, "console=")) {
537 pr_debug(" console was specified !\n");
542 pr_debug(" of_chosen is NULL !\n");
546 /* We are getting a weird phandle from OF ... */
547 /* ... So use the full path instead */
548 name
= of_get_property(of_chosen
, "linux,stdout-path", NULL
);
550 pr_debug(" no linux,stdout-path !\n");
553 prom_stdout
= of_find_node_by_path(name
);
555 pr_debug(" can't find stdout package %s !\n", name
);
558 pr_debug("stdout is %s\n", prom_stdout
->full_name
);
560 name
= of_get_property(prom_stdout
, "name", NULL
);
562 pr_debug(" stdout package has no name !\n");
566 if (strcmp(name
, "ch-a") == 0)
568 else if (strcmp(name
, "ch-b") == 0)
572 of_node_put(prom_stdout
);
574 pr_debug("Found serial console at %s%d\n", devname
, offset
);
576 return add_preferred_console(devname
, offset
, NULL
);
579 pr_debug("No preferred console found !\n");
580 of_node_put(prom_stdout
);
583 console_initcall(check_pmac_serial_console
);
585 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
588 * Called very early, MMU is off, device-tree isn't unflattened
590 static int __init
pmac_probe(void)
592 unsigned long root
= of_get_flat_dt_root();
594 if (!of_flat_dt_is_compatible(root
, "Power Macintosh") &&
595 !of_flat_dt_is_compatible(root
, "MacRISC"))
600 * On U3, the DART (iommu) must be allocated now since it
601 * has an impact on htab_initialize (due to the large page it
602 * occupies having to be broken up so the DART itself is not
603 * part of the cacheable linar mapping
611 /* isa_io_base gets set in pmac_pci_init */
612 ISA_DMA_THRESHOLD
= ~0L;
615 #endif /* CONFIG_PPC32 */
617 #ifdef CONFIG_PMAC_SMU
619 * SMU based G5s need some memory below 2Gb, at least the current
620 * driver needs that. We have to allocate it now. We allocate 4k
621 * (1 small page) for now.
623 smu_cmdbuf_abs
= lmb_alloc_base(4096, 4096, 0x80000000UL
);
624 #endif /* CONFIG_PMAC_SMU */
630 /* Move that to pci.c */
631 static int pmac_pci_probe_mode(struct pci_bus
*bus
)
633 struct device_node
*node
= pci_bus_to_OF_node(bus
);
635 /* We need to use normal PCI probing for the AGP bus,
636 * since the device for the AGP bridge isn't in the tree.
637 * Same for the PCIe host on U4 and the HT host bridge.
639 if (bus
->self
== NULL
&& (of_device_is_compatible(node
, "u3-agp") ||
640 of_device_is_compatible(node
, "u4-pcie") ||
641 of_device_is_compatible(node
, "u3-ht")))
642 return PCI_PROBE_NORMAL
;
643 return PCI_PROBE_DEVTREE
;
646 #ifdef CONFIG_HOTPLUG_CPU
647 /* access per cpu vars from generic smp.c */
648 DECLARE_PER_CPU(int, cpu_state
);
650 static void pmac_cpu_die(void)
653 * turn off as much as possible, we'll be
654 * kicked out as this will only be invoked
655 * on core99 platforms for now ...
658 printk(KERN_INFO
"CPU#%d offline\n", smp_processor_id());
659 __get_cpu_var(cpu_state
) = CPU_DEAD
;
663 * during the path that leads here preemption is disabled,
664 * reenable it now so that when coming up preempt count is
670 * hard-disable interrupts for the non-NAP case, the NAP code
671 * needs to re-enable interrupts (but soft-disables them)
676 /* let's not take timer interrupts too often ... */
679 /* should always be true at this point */
680 if (cpu_has_feature(CPU_FTR_CAN_NAP
))
681 power4_cpu_offline_powersave();
688 #endif /* CONFIG_HOTPLUG_CPU */
690 #endif /* CONFIG_PPC64 */
692 define_machine(powermac
) {
695 .setup_arch
= pmac_setup_arch
,
696 .init_early
= pmac_init_early
,
697 .show_cpuinfo
= pmac_show_cpuinfo
,
698 .init_IRQ
= pmac_pic_init
,
699 .get_irq
= NULL
, /* changed later */
700 .pci_irq_fixup
= pmac_pci_irq_fixup
,
701 .restart
= pmac_restart
,
702 .power_off
= pmac_power_off
,
704 .time_init
= pmac_time_init
,
705 .get_boot_time
= pmac_get_boot_time
,
706 .set_rtc_time
= pmac_set_rtc_time
,
707 .get_rtc_time
= pmac_get_rtc_time
,
708 .calibrate_decr
= pmac_calibrate_decr
,
709 .feature_call
= pmac_do_feature_call
,
710 .progress
= udbg_progress
,
712 .pci_probe_mode
= pmac_pci_probe_mode
,
713 .power_save
= power4_idle
,
714 .enable_pmcs
= power4_enable_pmcs
,
715 #endif /* CONFIG_PPC64 */
717 .pcibios_enable_device_hook
= pmac_pci_enable_device_hook
,
718 .pcibios_after_init
= pmac_pcibios_after_init
,
719 .phys_mem_access_prot
= pci_phys_mem_access_prot
,
721 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
722 .cpu_die
= pmac_cpu_die
,
724 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC32)
725 .cpu_die
= generic_mach_cpu_die
,