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>
54 #include <linux/of_device.h>
55 #include <linux/of_platform.h>
56 #include <linux/lmb.h>
59 #include <asm/sections.h>
61 #include <asm/system.h>
62 #include <asm/pgtable.h>
64 #include <asm/kexec.h>
65 #include <asm/pci-bridge.h>
66 #include <asm/ohare.h>
67 #include <asm/mediabay.h>
68 #include <asm/machdep.h>
70 #include <asm/cputable.h>
71 #include <asm/btext.h>
72 #include <asm/pmac_feature.h>
74 #include <asm/mmu_context.h>
75 #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 */
100 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
101 EXPORT_SYMBOL(sys_ctrler);
103 #ifdef CONFIG_PMAC_SMU
104 unsigned long smu_cmdbuf_abs;
105 EXPORT_SYMBOL(smu_cmdbuf_abs);
109 extern struct smp_ops_t psurge_smp_ops;
110 extern struct smp_ops_t core99_smp_ops;
111 #endif /* CONFIG_SMP */
113 static void pmac_show_cpuinfo(struct seq_file *m)
115 struct device_node *np;
119 unsigned int mbflags;
122 mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
123 PMAC_MB_INFO_MODEL, 0);
124 mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
125 PMAC_MB_INFO_FLAGS, 0);
126 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
127 (long) &mbname) != 0)
130 /* find motherboard type */
131 seq_printf(m, "machine\t\t: ");
132 np = of_find_node_by_path("/");
134 pp = of_get_property(np, "model", NULL);
136 seq_printf(m, "%s\n", pp);
138 seq_printf(m, "PowerMac\n");
139 pp = of_get_property(np, "compatible", &plen);
141 seq_printf(m, "motherboard\t:");
143 int l = strlen(pp) + 1;
144 seq_printf(m, " %s", pp);
152 seq_printf(m, "PowerMac\n");
154 /* print parsed model */
155 seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
156 seq_printf(m, "pmac flags\t: %08x\n", mbflags);
158 /* find l2 cache info */
159 np = of_find_node_by_name(NULL, "l2-cache");
161 np = of_find_node_by_type(NULL, "cache");
163 const unsigned int *ic =
164 of_get_property(np, "i-cache-size", NULL);
165 const unsigned int *dc =
166 of_get_property(np, "d-cache-size", NULL);
167 seq_printf(m, "L2 cache\t:");
169 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
170 seq_printf(m, " %dK unified", *dc / 1024);
173 seq_printf(m, " %dK instruction", *ic / 1024);
175 seq_printf(m, "%s %dK data",
176 (ic? " +": ""), *dc / 1024);
178 pp = of_get_property(np, "ram-type", NULL);
180 seq_printf(m, " %s", pp);
185 /* Indicate newworld/oldworld */
186 seq_printf(m, "pmac-generation\t: %s\n",
187 pmac_newworld ? "NewWorld" : "OldWorld");
190 #ifndef CONFIG_ADB_CUDA
191 int find_via_cuda(void)
193 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
198 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
199 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
204 #ifndef CONFIG_ADB_PMU
205 int find_via_pmu(void)
207 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
212 printk("WARNING ! Your machine is PMU-based but your kernel\n");
213 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
218 #ifndef CONFIG_PMAC_SMU
221 /* should check and warn if SMU is present */
227 static volatile u32 *sysctrl_regs;
229 static void __init ohare_init(void)
231 struct device_node *dn;
233 /* this area has the CPU identification register
234 and some registers used by smp boards */
235 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
238 * Turn on the L2 cache.
239 * We assume that we have a PSX memory controller iff
240 * we have an ohare I/O controller.
242 dn = of_find_node_by_name(NULL, "ohare");
245 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
246 if (sysctrl_regs[4] & 0x10)
247 sysctrl_regs[4] |= 0x04000020;
249 sysctrl_regs[4] |= 0x04000000;
251 printk(KERN_INFO "Level 2 cache enabled\n");
256 static void __init l2cr_init(void)
258 /* Checks "l2cr-value" property in the registry */
259 if (cpu_has_feature(CPU_FTR_L2CR)) {
260 struct device_node *np = of_find_node_by_name(NULL, "cpus");
262 np = of_find_node_by_type(NULL, "cpu");
264 const unsigned int *l2cr =
265 of_get_property(np, "l2cr-value", NULL);
267 ppc_override_l2cr = 1;
268 ppc_override_l2cr_value = *l2cr;
270 _set_L2CR(ppc_override_l2cr_value);
276 if (ppc_override_l2cr)
277 printk(KERN_INFO "L2CR overridden (0x%x), "
278 "backside cache is %s\n",
279 ppc_override_l2cr_value,
280 (ppc_override_l2cr_value & 0x80000000)
281 ? "enabled" : "disabled");
285 static void __init pmac_setup_arch(void)
287 struct device_node *cpu, *ic;
291 pvr = PVR_VER(mfspr(SPRN_PVR));
293 /* Set loops_per_jiffy to a half-way reasonable value,
294 for use until calibrate_delay gets called. */
295 loops_per_jiffy = 50000000 / HZ;
296 cpu = of_find_node_by_type(NULL, "cpu");
298 fp = of_get_property(cpu, "clock-frequency", NULL);
300 if (pvr >= 0x30 && pvr < 0x80)
302 loops_per_jiffy = *fp / (3 * HZ);
303 else if (pvr == 4 || pvr >= 8)
304 /* 604, G3, G4 etc. */
305 loops_per_jiffy = *fp / HZ;
308 loops_per_jiffy = *fp / (2 * HZ);
313 /* See if newworld or oldworld */
314 for (ic = NULL; (ic = of_find_all_nodes(ic)) != NULL; )
315 if (of_get_property(ic, "interrupt-controller", NULL))
322 /* Lookup PCI hosts */
328 #endif /* CONFIG_PPC32 */
334 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
335 defined(CONFIG_PPC64)
340 #ifdef CONFIG_BLK_DEV_INITRD
342 ROOT_DEV = Root_RAM0;
345 ROOT_DEV = DEFAULT_ROOT_DEVICE;
349 /* Check for Core99 */
350 ic = of_find_node_by_name(NULL, "uni-n");
352 ic = of_find_node_by_name(NULL, "u3");
354 ic = of_find_node_by_name(NULL, "u4");
357 smp_ops = &core99_smp_ops;
362 * We have to set bits in cpu_possible_map here since the
363 * secondary CPU(s) aren't in the device tree, and
364 * setup_per_cpu_areas only allocates per-cpu data for
365 * CPUs in the cpu_possible_map.
369 for (cpu = 1; cpu < 4 && cpu < NR_CPUS; ++cpu)
370 cpu_set(cpu, cpu_possible_map);
371 smp_ops = &psurge_smp_ops;
374 #endif /* CONFIG_SMP */
377 if (strstr(cmd_line, "adb_sync")) {
378 extern int __adb_probe_sync;
379 __adb_probe_sync = 1;
381 #endif /* CONFIG_ADB */
385 void note_scsi_host(struct device_node *node, void *host)
388 EXPORT_SYMBOL(note_scsi_host);
391 static int initializing = 1;
393 static int pmac_late_init(void)
396 /* this is udbg (which is __init) and we can later use it during
397 * cpu hotplug (in smp_core99_kick_cpu) */
398 ppc_md.progress = NULL;
401 machine_late_initcall(powermac, pmac_late_init);
404 * This is __init_refok because we check for "initializing" before
405 * touching any of the __init sensitive things and "initializing"
406 * will be false after __init time. This can't be __init because it
407 * can be called whenever a disk is first accessed.
409 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
415 if ((goodness <= current_root_goodness) &&
416 ROOT_DEV != DEFAULT_ROOT_DEVICE)
418 p = strstr(boot_command_line, "root=");
419 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
422 ROOT_DEV = dev + part;
423 current_root_goodness = goodness;
426 #ifdef CONFIG_ADB_CUDA
427 static void cuda_restart(void)
429 struct adb_request req;
431 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
436 static void cuda_shutdown(void)
438 struct adb_request req;
440 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
446 #define cuda_restart()
447 #define cuda_shutdown()
450 #ifndef CONFIG_ADB_PMU
451 #define pmu_restart()
452 #define pmu_shutdown()
455 #ifndef CONFIG_PMAC_SMU
456 #define smu_restart()
457 #define smu_shutdown()
460 static void pmac_restart(char *cmd)
462 switch (sys_ctrler) {
463 case SYS_CTRLER_CUDA:
476 static void pmac_power_off(void)
478 switch (sys_ctrler) {
479 case SYS_CTRLER_CUDA:
499 * Early initialization.
501 static void __init pmac_init_early(void)
503 /* Enable early btext debug if requested */
504 if (strstr(cmd_line, "btextdbg")) {
505 udbg_adb_init_early();
506 register_early_udbg_console();
509 /* Probe motherboard chipset */
512 /* Initialize debug stuff */
513 udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
514 udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
517 iommu_init_early_dart();
521 static int __init pmac_declare_of_platform_devices(void)
523 struct device_node *np;
525 if (machine_is(chrp))
528 np = of_find_node_by_name(NULL, "valkyrie");
530 of_platform_device_create(np, "valkyrie", NULL);
531 np = of_find_node_by_name(NULL, "platinum");
533 of_platform_device_create(np, "platinum", NULL);
534 np = of_find_node_by_type(NULL, "smu");
536 of_platform_device_create(np, "smu", NULL);
542 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
545 * Called very early, MMU is off, device-tree isn't unflattened
547 static int __init pmac_probe(void)
549 unsigned long root = of_get_flat_dt_root();
551 if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
552 !of_flat_dt_is_compatible(root, "MacRISC"))
557 * On U3, the DART (iommu) must be allocated now since it
558 * has an impact on htab_initialize (due to the large page it
559 * occupies having to be broken up so the DART itself is not
560 * part of the cacheable linar mapping
568 /* isa_io_base gets set in pmac_pci_init */
569 ISA_DMA_THRESHOLD = ~0L;
572 #endif /* CONFIG_PPC32 */
574 #ifdef CONFIG_PMAC_SMU
576 * SMU based G5s need some memory below 2Gb, at least the current
577 * driver needs that. We have to allocate it now. We allocate 4k
578 * (1 small page) for now.
580 smu_cmdbuf_abs = lmb_alloc_base(4096, 4096, 0x80000000UL);
581 #endif /* CONFIG_PMAC_SMU */
587 /* Move that to pci.c */
588 static int pmac_pci_probe_mode(struct pci_bus *bus)
590 struct device_node *node = bus->sysdata;
592 /* We need to use normal PCI probing for the AGP bus,
593 * since the device for the AGP bridge isn't in the tree.
594 * Same for the PCIe host on U4 and the HT host bridge.
596 if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
597 of_device_is_compatible(node, "u4-pcie") ||
598 of_device_is_compatible(node, "u3-ht")))
599 return PCI_PROBE_NORMAL;
600 return PCI_PROBE_DEVTREE;
603 #ifdef CONFIG_HOTPLUG_CPU
604 /* access per cpu vars from generic smp.c */
605 DECLARE_PER_CPU(int, cpu_state);
607 static void pmac_cpu_die(void)
610 * turn off as much as possible, we'll be
611 * kicked out as this will only be invoked
612 * on core99 platforms for now ...
615 printk(KERN_INFO "CPU#%d offline\n", smp_processor_id());
616 __get_cpu_var(cpu_state) = CPU_DEAD;
620 * during the path that leads here preemption is disabled,
621 * reenable it now so that when coming up preempt count is
627 * hard-disable interrupts for the non-NAP case, the NAP code
628 * needs to re-enable interrupts (but soft-disables them)
633 /* let's not take timer interrupts too often ... */
636 /* should always be true at this point */
637 if (cpu_has_feature(CPU_FTR_CAN_NAP))
638 power4_cpu_offline_powersave();
645 #endif /* CONFIG_HOTPLUG_CPU */
647 #endif /* CONFIG_PPC64 */
649 define_machine(powermac) {
652 .setup_arch = pmac_setup_arch,
653 .init_early = pmac_init_early,
654 .show_cpuinfo = pmac_show_cpuinfo,
655 .init_IRQ = pmac_pic_init,
656 .get_irq = NULL, /* changed later */
657 .pci_irq_fixup = pmac_pci_irq_fixup,
658 .restart = pmac_restart,
659 .power_off = pmac_power_off,
661 .time_init = pmac_time_init,
662 .get_boot_time = pmac_get_boot_time,
663 .set_rtc_time = pmac_set_rtc_time,
664 .get_rtc_time = pmac_get_rtc_time,
665 .calibrate_decr = pmac_calibrate_decr,
666 .feature_call = pmac_do_feature_call,
667 .progress = udbg_progress,
669 .pci_probe_mode = pmac_pci_probe_mode,
670 .power_save = power4_idle,
671 .enable_pmcs = power4_enable_pmcs,
673 .machine_kexec = default_machine_kexec,
674 .machine_kexec_prepare = default_machine_kexec_prepare,
675 .machine_crash_shutdown = default_machine_crash_shutdown,
677 #endif /* CONFIG_PPC64 */
679 .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
680 .pcibios_after_init = pmac_pcibios_after_init,
681 .phys_mem_access_prot = pci_phys_mem_access_prot,
683 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
684 .cpu_die = pmac_cpu_die,