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/kexec.h>
64 #include <asm/pci-bridge.h>
65 #include <asm/ohare.h>
66 #include <asm/mediabay.h>
67 #include <asm/machdep.h>
69 #include <asm/cputable.h>
70 #include <asm/btext.h>
71 #include <asm/pmac_feature.h>
73 #include <asm/mmu_context.h>
74 #include <asm/iommu.h>
81 #undef SHOW_GATWICK_IRQS
83 int ppc_override_l2cr = 0;
84 int ppc_override_l2cr_value;
89 static int current_root_goodness = -1;
91 extern struct machdep_calls pmac_md;
93 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
99 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
100 EXPORT_SYMBOL(sys_ctrler);
102 #ifdef CONFIG_PMAC_SMU
103 unsigned long smu_cmdbuf_abs;
104 EXPORT_SYMBOL(smu_cmdbuf_abs);
108 extern struct smp_ops_t psurge_smp_ops;
109 extern struct smp_ops_t core99_smp_ops;
110 #endif /* CONFIG_SMP */
112 static void pmac_show_cpuinfo(struct seq_file *m)
114 struct device_node *np;
118 unsigned int mbflags;
121 mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
122 PMAC_MB_INFO_MODEL, 0);
123 mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
124 PMAC_MB_INFO_FLAGS, 0);
125 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
126 (long) &mbname) != 0)
129 /* find motherboard type */
130 seq_printf(m, "machine\t\t: ");
131 np = of_find_node_by_path("/");
133 pp = of_get_property(np, "model", NULL);
135 seq_printf(m, "%s\n", pp);
137 seq_printf(m, "PowerMac\n");
138 pp = of_get_property(np, "compatible", &plen);
140 seq_printf(m, "motherboard\t:");
142 int l = strlen(pp) + 1;
143 seq_printf(m, " %s", pp);
151 seq_printf(m, "PowerMac\n");
153 /* print parsed model */
154 seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
155 seq_printf(m, "pmac flags\t: %08x\n", mbflags);
157 /* find l2 cache info */
158 np = of_find_node_by_name(NULL, "l2-cache");
160 np = of_find_node_by_type(NULL, "cache");
162 const unsigned int *ic =
163 of_get_property(np, "i-cache-size", NULL);
164 const unsigned int *dc =
165 of_get_property(np, "d-cache-size", NULL);
166 seq_printf(m, "L2 cache\t:");
168 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
169 seq_printf(m, " %dK unified", *dc / 1024);
172 seq_printf(m, " %dK instruction", *ic / 1024);
174 seq_printf(m, "%s %dK data",
175 (ic? " +": ""), *dc / 1024);
177 pp = of_get_property(np, "ram-type", NULL);
179 seq_printf(m, " %s", pp);
184 /* Indicate newworld/oldworld */
185 seq_printf(m, "pmac-generation\t: %s\n",
186 pmac_newworld ? "NewWorld" : "OldWorld");
189 #ifndef CONFIG_ADB_CUDA
190 int find_via_cuda(void)
192 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
197 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
198 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
203 #ifndef CONFIG_ADB_PMU
204 int find_via_pmu(void)
206 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
211 printk("WARNING ! Your machine is PMU-based but your kernel\n");
212 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
217 #ifndef CONFIG_PMAC_SMU
220 /* should check and warn if SMU is present */
226 static volatile u32 *sysctrl_regs;
228 static void __init ohare_init(void)
230 struct device_node *dn;
232 /* this area has the CPU identification register
233 and some registers used by smp boards */
234 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
237 * Turn on the L2 cache.
238 * We assume that we have a PSX memory controller iff
239 * we have an ohare I/O controller.
241 dn = of_find_node_by_name(NULL, "ohare");
244 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
245 if (sysctrl_regs[4] & 0x10)
246 sysctrl_regs[4] |= 0x04000020;
248 sysctrl_regs[4] |= 0x04000000;
250 printk(KERN_INFO "Level 2 cache enabled\n");
255 static void __init l2cr_init(void)
257 /* Checks "l2cr-value" property in the registry */
258 if (cpu_has_feature(CPU_FTR_L2CR)) {
259 struct device_node *np = of_find_node_by_name(NULL, "cpus");
261 np = of_find_node_by_type(NULL, "cpu");
263 const unsigned int *l2cr =
264 of_get_property(np, "l2cr-value", NULL);
266 ppc_override_l2cr = 1;
267 ppc_override_l2cr_value = *l2cr;
269 _set_L2CR(ppc_override_l2cr_value);
275 if (ppc_override_l2cr)
276 printk(KERN_INFO "L2CR overridden (0x%x), "
277 "backside cache is %s\n",
278 ppc_override_l2cr_value,
279 (ppc_override_l2cr_value & 0x80000000)
280 ? "enabled" : "disabled");
284 static void __init pmac_setup_arch(void)
286 struct device_node *cpu, *ic;
290 pvr = PVR_VER(mfspr(SPRN_PVR));
292 /* Set loops_per_jiffy to a half-way reasonable value,
293 for use until calibrate_delay gets called. */
294 loops_per_jiffy = 50000000 / HZ;
295 cpu = of_find_node_by_type(NULL, "cpu");
297 fp = of_get_property(cpu, "clock-frequency", NULL);
299 if (pvr >= 0x30 && pvr < 0x80)
301 loops_per_jiffy = *fp / (3 * HZ);
302 else if (pvr == 4 || pvr >= 8)
303 /* 604, G3, G4 etc. */
304 loops_per_jiffy = *fp / HZ;
307 loops_per_jiffy = *fp / (2 * HZ);
312 /* See if newworld or oldworld */
313 ic = of_find_node_with_property(NULL, "interrupt-controller");
319 /* Lookup PCI hosts */
325 #endif /* CONFIG_PPC32 */
331 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
332 defined(CONFIG_PPC64)
337 #ifdef CONFIG_BLK_DEV_INITRD
339 ROOT_DEV = Root_RAM0;
342 ROOT_DEV = DEFAULT_ROOT_DEVICE;
346 /* Check for Core99 */
347 ic = of_find_node_by_name(NULL, "uni-n");
349 ic = of_find_node_by_name(NULL, "u3");
351 ic = of_find_node_by_name(NULL, "u4");
354 smp_ops = &core99_smp_ops;
359 * We have to set bits in cpu_possible_map here since the
360 * secondary CPU(s) aren't in the device tree, and
361 * setup_per_cpu_areas only allocates per-cpu data for
362 * CPUs in the cpu_possible_map.
366 for (cpu = 1; cpu < 4 && cpu < NR_CPUS; ++cpu)
367 cpu_set(cpu, cpu_possible_map);
368 smp_ops = &psurge_smp_ops;
371 #endif /* CONFIG_SMP */
374 if (strstr(cmd_line, "adb_sync")) {
375 extern int __adb_probe_sync;
376 __adb_probe_sync = 1;
378 #endif /* CONFIG_ADB */
382 void note_scsi_host(struct device_node *node, void *host)
385 EXPORT_SYMBOL(note_scsi_host);
388 static int initializing = 1;
390 static int pmac_late_init(void)
393 /* this is udbg (which is __init) and we can later use it during
394 * cpu hotplug (in smp_core99_kick_cpu) */
395 ppc_md.progress = NULL;
398 machine_late_initcall(powermac, pmac_late_init);
401 * This is __init_refok because we check for "initializing" before
402 * touching any of the __init sensitive things and "initializing"
403 * will be false after __init time. This can't be __init because it
404 * can be called whenever a disk is first accessed.
406 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
412 if ((goodness <= current_root_goodness) &&
413 ROOT_DEV != DEFAULT_ROOT_DEVICE)
415 p = strstr(boot_command_line, "root=");
416 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
419 ROOT_DEV = dev + part;
420 current_root_goodness = goodness;
423 #ifdef CONFIG_ADB_CUDA
424 static void cuda_restart(void)
426 struct adb_request req;
428 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
433 static void cuda_shutdown(void)
435 struct adb_request req;
437 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
443 #define cuda_restart()
444 #define cuda_shutdown()
447 #ifndef CONFIG_ADB_PMU
448 #define pmu_restart()
449 #define pmu_shutdown()
452 #ifndef CONFIG_PMAC_SMU
453 #define smu_restart()
454 #define smu_shutdown()
457 static void pmac_restart(char *cmd)
459 switch (sys_ctrler) {
460 case SYS_CTRLER_CUDA:
473 static void pmac_power_off(void)
475 switch (sys_ctrler) {
476 case SYS_CTRLER_CUDA:
496 * Early initialization.
498 static void __init pmac_init_early(void)
500 /* Enable early btext debug if requested */
501 if (strstr(cmd_line, "btextdbg")) {
502 udbg_adb_init_early();
503 register_early_udbg_console();
506 /* Probe motherboard chipset */
509 /* Initialize debug stuff */
510 udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
511 udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
514 iommu_init_early_dart();
518 static int __init pmac_declare_of_platform_devices(void)
520 struct device_node *np;
522 if (machine_is(chrp))
525 np = of_find_node_by_name(NULL, "valkyrie");
527 of_platform_device_create(np, "valkyrie", NULL);
528 np = of_find_node_by_name(NULL, "platinum");
530 of_platform_device_create(np, "platinum", NULL);
531 np = of_find_node_by_type(NULL, "smu");
533 of_platform_device_create(np, "smu", NULL);
539 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
541 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
543 * This is called very early, as part of console_init() (typically just after
544 * time_init()). This function is respondible for trying to find a good
545 * default console on serial ports. It tries to match the open firmware
546 * default output with one of the available serial console drivers.
548 static int __init check_pmac_serial_console(void)
550 struct device_node *prom_stdout = NULL;
553 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
554 char *devname = "ttyS";
556 char *devname = "ttyPZ";
559 pr_debug(" -> check_pmac_serial_console()\n");
561 /* The user has requested a console so this is already set up. */
562 if (strstr(boot_command_line, "console=")) {
563 pr_debug(" console was specified !\n");
568 pr_debug(" of_chosen is NULL !\n");
572 /* We are getting a weird phandle from OF ... */
573 /* ... So use the full path instead */
574 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
576 pr_debug(" no linux,stdout-path !\n");
579 prom_stdout = of_find_node_by_path(name);
581 pr_debug(" can't find stdout package %s !\n", name);
584 pr_debug("stdout is %s\n", prom_stdout->full_name);
586 name = of_get_property(prom_stdout, "name", NULL);
588 pr_debug(" stdout package has no name !\n");
592 if (strcmp(name, "ch-a") == 0)
594 else if (strcmp(name, "ch-b") == 0)
598 of_node_put(prom_stdout);
600 pr_debug("Found serial console at %s%d\n", devname, offset);
602 return add_preferred_console(devname, offset, NULL);
605 pr_debug("No preferred console found !\n");
606 of_node_put(prom_stdout);
609 console_initcall(check_pmac_serial_console);
611 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
614 * Called very early, MMU is off, device-tree isn't unflattened
616 static int __init pmac_probe(void)
618 unsigned long root = of_get_flat_dt_root();
620 if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
621 !of_flat_dt_is_compatible(root, "MacRISC"))
626 * On U3, the DART (iommu) must be allocated now since it
627 * has an impact on htab_initialize (due to the large page it
628 * occupies having to be broken up so the DART itself is not
629 * part of the cacheable linar mapping
637 /* isa_io_base gets set in pmac_pci_init */
638 ISA_DMA_THRESHOLD = ~0L;
641 #endif /* CONFIG_PPC32 */
643 #ifdef CONFIG_PMAC_SMU
645 * SMU based G5s need some memory below 2Gb, at least the current
646 * driver needs that. We have to allocate it now. We allocate 4k
647 * (1 small page) for now.
649 smu_cmdbuf_abs = lmb_alloc_base(4096, 4096, 0x80000000UL);
650 #endif /* CONFIG_PMAC_SMU */
656 /* Move that to pci.c */
657 static int pmac_pci_probe_mode(struct pci_bus *bus)
659 struct device_node *node = bus->sysdata;
661 /* We need to use normal PCI probing for the AGP bus,
662 * since the device for the AGP bridge isn't in the tree.
663 * Same for the PCIe host on U4 and the HT host bridge.
665 if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
666 of_device_is_compatible(node, "u4-pcie") ||
667 of_device_is_compatible(node, "u3-ht")))
668 return PCI_PROBE_NORMAL;
669 return PCI_PROBE_DEVTREE;
672 #ifdef CONFIG_HOTPLUG_CPU
673 /* access per cpu vars from generic smp.c */
674 DECLARE_PER_CPU(int, cpu_state);
676 static void pmac_cpu_die(void)
679 * turn off as much as possible, we'll be
680 * kicked out as this will only be invoked
681 * on core99 platforms for now ...
684 printk(KERN_INFO "CPU#%d offline\n", smp_processor_id());
685 __get_cpu_var(cpu_state) = CPU_DEAD;
689 * during the path that leads here preemption is disabled,
690 * reenable it now so that when coming up preempt count is
696 * hard-disable interrupts for the non-NAP case, the NAP code
697 * needs to re-enable interrupts (but soft-disables them)
702 /* let's not take timer interrupts too often ... */
705 /* should always be true at this point */
706 if (cpu_has_feature(CPU_FTR_CAN_NAP))
707 power4_cpu_offline_powersave();
714 #endif /* CONFIG_HOTPLUG_CPU */
716 #endif /* CONFIG_PPC64 */
718 define_machine(powermac) {
721 .setup_arch = pmac_setup_arch,
722 .init_early = pmac_init_early,
723 .show_cpuinfo = pmac_show_cpuinfo,
724 .init_IRQ = pmac_pic_init,
725 .get_irq = NULL, /* changed later */
726 .pci_irq_fixup = pmac_pci_irq_fixup,
727 .restart = pmac_restart,
728 .power_off = pmac_power_off,
730 .time_init = pmac_time_init,
731 .get_boot_time = pmac_get_boot_time,
732 .set_rtc_time = pmac_set_rtc_time,
733 .get_rtc_time = pmac_get_rtc_time,
734 .calibrate_decr = pmac_calibrate_decr,
735 .feature_call = pmac_do_feature_call,
736 .progress = udbg_progress,
738 .pci_probe_mode = pmac_pci_probe_mode,
739 .power_save = power4_idle,
740 .enable_pmcs = power4_enable_pmcs,
742 .machine_kexec = default_machine_kexec,
743 .machine_kexec_prepare = default_machine_kexec_prepare,
744 .machine_crash_shutdown = default_machine_crash_shutdown,
746 #endif /* CONFIG_PPC64 */
748 .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
749 .pcibios_after_init = pmac_pcibios_after_init,
750 .phys_mem_access_prot = pci_phys_mem_access_prot,
752 #if defined(CONFIG_HOTPLUG_CPU) && defined(CONFIG_PPC64)
753 .cpu_die = pmac_cpu_die,