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/export.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/memblock.h>
58 #include <asm/sections.h>
60 #include <asm/pgtable.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/mmu_context.h>
72 #include <asm/iommu.h>
79 #undef SHOW_GATWICK_IRQS
81 int ppc_override_l2cr = 0;
82 int ppc_override_l2cr_value;
87 static int current_root_goodness = -1;
89 extern struct machdep_calls pmac_md;
91 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
97 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
98 EXPORT_SYMBOL(sys_ctrler);
100 #ifdef CONFIG_PMAC_SMU
101 unsigned long smu_cmdbuf_abs;
102 EXPORT_SYMBOL(smu_cmdbuf_abs);
105 static void pmac_show_cpuinfo(struct seq_file *m)
107 struct device_node *np;
111 unsigned int mbflags;
114 mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
115 PMAC_MB_INFO_MODEL, 0);
116 mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
117 PMAC_MB_INFO_FLAGS, 0);
118 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
119 (long) &mbname) != 0)
122 /* find motherboard type */
123 seq_printf(m, "machine\t\t: ");
124 np = of_find_node_by_path("/");
126 pp = of_get_property(np, "model", NULL);
128 seq_printf(m, "%s\n", pp);
130 seq_printf(m, "PowerMac\n");
131 pp = of_get_property(np, "compatible", &plen);
133 seq_printf(m, "motherboard\t:");
135 int l = strlen(pp) + 1;
136 seq_printf(m, " %s", pp);
144 seq_printf(m, "PowerMac\n");
146 /* print parsed model */
147 seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
148 seq_printf(m, "pmac flags\t: %08x\n", mbflags);
150 /* find l2 cache info */
151 np = of_find_node_by_name(NULL, "l2-cache");
153 np = of_find_node_by_type(NULL, "cache");
155 const unsigned int *ic =
156 of_get_property(np, "i-cache-size", NULL);
157 const unsigned int *dc =
158 of_get_property(np, "d-cache-size", NULL);
159 seq_printf(m, "L2 cache\t:");
161 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
162 seq_printf(m, " %dK unified", *dc / 1024);
165 seq_printf(m, " %dK instruction", *ic / 1024);
167 seq_printf(m, "%s %dK data",
168 (ic? " +": ""), *dc / 1024);
170 pp = of_get_property(np, "ram-type", NULL);
172 seq_printf(m, " %s", pp);
177 /* Indicate newworld/oldworld */
178 seq_printf(m, "pmac-generation\t: %s\n",
179 pmac_newworld ? "NewWorld" : "OldWorld");
182 #ifndef CONFIG_ADB_CUDA
183 int find_via_cuda(void)
185 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
190 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
191 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
196 #ifndef CONFIG_ADB_PMU
197 int find_via_pmu(void)
199 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
204 printk("WARNING ! Your machine is PMU-based but your kernel\n");
205 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
210 #ifndef CONFIG_PMAC_SMU
213 /* should check and warn if SMU is present */
219 static volatile u32 *sysctrl_regs;
221 static void __init ohare_init(void)
223 struct device_node *dn;
225 /* this area has the CPU identification register
226 and some registers used by smp boards */
227 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
230 * Turn on the L2 cache.
231 * We assume that we have a PSX memory controller iff
232 * we have an ohare I/O controller.
234 dn = of_find_node_by_name(NULL, "ohare");
237 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
238 if (sysctrl_regs[4] & 0x10)
239 sysctrl_regs[4] |= 0x04000020;
241 sysctrl_regs[4] |= 0x04000000;
243 printk(KERN_INFO "Level 2 cache enabled\n");
248 static void __init l2cr_init(void)
250 /* Checks "l2cr-value" property in the registry */
251 if (cpu_has_feature(CPU_FTR_L2CR)) {
252 struct device_node *np = of_find_node_by_name(NULL, "cpus");
254 np = of_find_node_by_type(NULL, "cpu");
256 const unsigned int *l2cr =
257 of_get_property(np, "l2cr-value", NULL);
259 ppc_override_l2cr = 1;
260 ppc_override_l2cr_value = *l2cr;
262 _set_L2CR(ppc_override_l2cr_value);
268 if (ppc_override_l2cr)
269 printk(KERN_INFO "L2CR overridden (0x%x), "
270 "backside cache is %s\n",
271 ppc_override_l2cr_value,
272 (ppc_override_l2cr_value & 0x80000000)
273 ? "enabled" : "disabled");
277 static void __init pmac_setup_arch(void)
279 struct device_node *cpu, *ic;
283 pvr = PVR_VER(mfspr(SPRN_PVR));
285 /* Set loops_per_jiffy to a half-way reasonable value,
286 for use until calibrate_delay gets called. */
287 loops_per_jiffy = 50000000 / HZ;
288 cpu = of_find_node_by_type(NULL, "cpu");
290 fp = of_get_property(cpu, "clock-frequency", NULL);
292 if (pvr >= 0x30 && pvr < 0x80)
294 loops_per_jiffy = *fp / (3 * HZ);
295 else if (pvr == 4 || pvr >= 8)
296 /* 604, G3, G4 etc. */
297 loops_per_jiffy = *fp / HZ;
300 loops_per_jiffy = *fp / (2 * HZ);
305 /* See if newworld or oldworld */
306 ic = of_find_node_with_property(NULL, "interrupt-controller");
312 /* Lookup PCI hosts */
318 #endif /* CONFIG_PPC32 */
324 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
325 defined(CONFIG_PPC64)
330 #ifdef CONFIG_BLK_DEV_INITRD
332 ROOT_DEV = Root_RAM0;
335 ROOT_DEV = DEFAULT_ROOT_DEVICE;
339 if (strstr(boot_command_line, "adb_sync")) {
340 extern int __adb_probe_sync;
341 __adb_probe_sync = 1;
343 #endif /* CONFIG_ADB */
347 void note_scsi_host(struct device_node *node, void *host)
350 EXPORT_SYMBOL(note_scsi_host);
353 static int initializing = 1;
355 static int pmac_late_init(void)
360 machine_late_initcall(powermac, pmac_late_init);
363 * This is __init_refok because we check for "initializing" before
364 * touching any of the __init sensitive things and "initializing"
365 * will be false after __init time. This can't be __init because it
366 * can be called whenever a disk is first accessed.
368 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
374 if ((goodness <= current_root_goodness) &&
375 ROOT_DEV != DEFAULT_ROOT_DEVICE)
377 p = strstr(boot_command_line, "root=");
378 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
381 ROOT_DEV = dev + part;
382 current_root_goodness = goodness;
385 #ifdef CONFIG_ADB_CUDA
386 static void cuda_restart(void)
388 struct adb_request req;
390 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
395 static void cuda_shutdown(void)
397 struct adb_request req;
399 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
405 #define cuda_restart()
406 #define cuda_shutdown()
409 #ifndef CONFIG_ADB_PMU
410 #define pmu_restart()
411 #define pmu_shutdown()
414 #ifndef CONFIG_PMAC_SMU
415 #define smu_restart()
416 #define smu_shutdown()
419 static void pmac_restart(char *cmd)
421 switch (sys_ctrler) {
422 case SYS_CTRLER_CUDA:
435 static void pmac_power_off(void)
437 switch (sys_ctrler) {
438 case SYS_CTRLER_CUDA:
458 * Early initialization.
460 static void __init pmac_init_early(void)
462 /* Enable early btext debug if requested */
463 if (strstr(boot_command_line, "btextdbg")) {
464 udbg_adb_init_early();
465 register_early_udbg_console();
468 /* Probe motherboard chipset */
471 /* Initialize debug stuff */
472 udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
473 udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
476 iommu_init_early_dart(&pmac_pci_controller_ops);
479 /* SMP Init has to be done early as we need to patch up
480 * cpu_possible_mask before interrupt stacks are allocated
488 static int __init pmac_declare_of_platform_devices(void)
490 struct device_node *np;
492 if (machine_is(chrp))
495 np = of_find_node_by_name(NULL, "valkyrie");
497 of_platform_device_create(np, "valkyrie", NULL);
500 np = of_find_node_by_name(NULL, "platinum");
502 of_platform_device_create(np, "platinum", NULL);
505 np = of_find_node_by_type(NULL, "smu");
507 of_platform_device_create(np, "smu", NULL);
510 np = of_find_node_by_type(NULL, "fcu");
512 /* Some machines have strangely broken device-tree */
513 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
516 of_platform_device_create(np, "temperature", NULL);
522 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
524 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
526 * This is called very early, as part of console_init() (typically just after
527 * time_init()). This function is respondible for trying to find a good
528 * default console on serial ports. It tries to match the open firmware
529 * default output with one of the available serial console drivers.
531 static int __init check_pmac_serial_console(void)
533 struct device_node *prom_stdout = NULL;
536 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
537 char *devname = "ttyS";
539 char *devname = "ttyPZ";
542 pr_debug(" -> check_pmac_serial_console()\n");
544 /* The user has requested a console so this is already set up. */
545 if (strstr(boot_command_line, "console=")) {
546 pr_debug(" console was specified !\n");
551 pr_debug(" of_chosen is NULL !\n");
555 /* We are getting a weird phandle from OF ... */
556 /* ... So use the full path instead */
557 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
559 pr_debug(" no linux,stdout-path !\n");
562 prom_stdout = of_find_node_by_path(name);
564 pr_debug(" can't find stdout package %s !\n", name);
567 pr_debug("stdout is %s\n", prom_stdout->full_name);
569 name = of_get_property(prom_stdout, "name", NULL);
571 pr_debug(" stdout package has no name !\n");
575 if (strcmp(name, "ch-a") == 0)
577 else if (strcmp(name, "ch-b") == 0)
581 of_node_put(prom_stdout);
583 pr_debug("Found serial console at %s%d\n", devname, offset);
585 return add_preferred_console(devname, offset, NULL);
588 pr_debug("No preferred console found !\n");
589 of_node_put(prom_stdout);
592 console_initcall(check_pmac_serial_console);
594 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
597 * Called very early, MMU is off, device-tree isn't unflattened
599 static int __init pmac_probe(void)
601 unsigned long root = of_get_flat_dt_root();
603 if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
604 !of_flat_dt_is_compatible(root, "MacRISC"))
609 * On U3, the DART (iommu) must be allocated now since it
610 * has an impact on htab_initialize (due to the large page it
611 * occupies having to be broken up so the DART itself is not
612 * part of the cacheable linar mapping
620 /* isa_io_base gets set in pmac_pci_init */
621 ISA_DMA_THRESHOLD = ~0L;
624 #endif /* CONFIG_PPC32 */
626 #ifdef CONFIG_PMAC_SMU
628 * SMU based G5s need some memory below 2Gb, at least the current
629 * driver needs that. We have to allocate it now. We allocate 4k
630 * (1 small page) for now.
632 smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
633 #endif /* CONFIG_PMAC_SMU */
635 pm_power_off = pmac_power_off;
640 define_machine(powermac) {
643 .setup_arch = pmac_setup_arch,
644 .init_early = pmac_init_early,
645 .show_cpuinfo = pmac_show_cpuinfo,
646 .init_IRQ = pmac_pic_init,
647 .get_irq = NULL, /* changed later */
648 .pci_irq_fixup = pmac_pci_irq_fixup,
649 .restart = pmac_restart,
651 .time_init = pmac_time_init,
652 .get_boot_time = pmac_get_boot_time,
653 .set_rtc_time = pmac_set_rtc_time,
654 .get_rtc_time = pmac_get_rtc_time,
655 .calibrate_decr = pmac_calibrate_decr,
656 .feature_call = pmac_do_feature_call,
657 .progress = udbg_progress,
659 .power_save = power4_idle,
660 .enable_pmcs = power4_enable_pmcs,
661 #endif /* CONFIG_PPC64 */
663 .pcibios_after_init = pmac_pcibios_after_init,
664 .phys_mem_access_prot = pci_phys_mem_access_prot,