2 * Powermac setup and early boot code plus other random bits.
7 * Adapted for Power Macintosh by Paul Mackerras
10 * Derived from "arch/alpha/kernel/setup.c"
11 * Copyright (C) 1995 Linus Torvalds
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>
57 #include <asm/sections.h>
59 #include <asm/pgtable.h>
61 #include <asm/pci-bridge.h>
62 #include <asm/ohare.h>
63 #include <asm/mediabay.h>
64 #include <asm/machdep.h>
66 #include <asm/cputable.h>
67 #include <asm/btext.h>
68 #include <asm/pmac_feature.h>
70 #include <asm/mmu_context.h>
71 #include <asm/iommu.h>
78 #undef SHOW_GATWICK_IRQS
80 int ppc_override_l2cr = 0;
81 int ppc_override_l2cr_value;
86 static int current_root_goodness = -1;
88 extern struct machdep_calls pmac_md;
90 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
96 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
97 EXPORT_SYMBOL(sys_ctrler);
99 static void pmac_show_cpuinfo(struct seq_file *m)
101 struct device_node *np;
105 unsigned int mbflags;
108 mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
109 PMAC_MB_INFO_MODEL, 0);
110 mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
111 PMAC_MB_INFO_FLAGS, 0);
112 if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
113 (long) &mbname) != 0)
116 /* find motherboard type */
117 seq_printf(m, "machine\t\t: ");
118 np = of_find_node_by_path("/");
120 pp = of_get_property(np, "model", NULL);
122 seq_printf(m, "%s\n", pp);
124 seq_printf(m, "PowerMac\n");
125 pp = of_get_property(np, "compatible", &plen);
127 seq_printf(m, "motherboard\t:");
129 int l = strlen(pp) + 1;
130 seq_printf(m, " %s", pp);
138 seq_printf(m, "PowerMac\n");
140 /* print parsed model */
141 seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
142 seq_printf(m, "pmac flags\t: %08x\n", mbflags);
144 /* find l2 cache info */
145 np = of_find_node_by_name(NULL, "l2-cache");
147 np = of_find_node_by_type(NULL, "cache");
149 const unsigned int *ic =
150 of_get_property(np, "i-cache-size", NULL);
151 const unsigned int *dc =
152 of_get_property(np, "d-cache-size", NULL);
153 seq_printf(m, "L2 cache\t:");
155 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
156 seq_printf(m, " %dK unified", *dc / 1024);
159 seq_printf(m, " %dK instruction", *ic / 1024);
161 seq_printf(m, "%s %dK data",
162 (ic? " +": ""), *dc / 1024);
164 pp = of_get_property(np, "ram-type", NULL);
166 seq_printf(m, " %s", pp);
171 /* Indicate newworld/oldworld */
172 seq_printf(m, "pmac-generation\t: %s\n",
173 pmac_newworld ? "NewWorld" : "OldWorld");
176 #ifndef CONFIG_ADB_CUDA
177 int find_via_cuda(void)
179 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
184 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
185 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
190 #ifndef CONFIG_ADB_PMU
191 int find_via_pmu(void)
193 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
198 printk("WARNING ! Your machine is PMU-based but your kernel\n");
199 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
204 #ifndef CONFIG_PMAC_SMU
207 /* should check and warn if SMU is present */
213 static volatile u32 *sysctrl_regs;
215 static void __init ohare_init(void)
217 struct device_node *dn;
219 /* this area has the CPU identification register
220 and some registers used by smp boards */
221 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
224 * Turn on the L2 cache.
225 * We assume that we have a PSX memory controller iff
226 * we have an ohare I/O controller.
228 dn = of_find_node_by_name(NULL, "ohare");
231 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
232 if (sysctrl_regs[4] & 0x10)
233 sysctrl_regs[4] |= 0x04000020;
235 sysctrl_regs[4] |= 0x04000000;
237 printk(KERN_INFO "Level 2 cache enabled\n");
242 static void __init l2cr_init(void)
244 /* Checks "l2cr-value" property in the registry */
245 if (cpu_has_feature(CPU_FTR_L2CR)) {
246 struct device_node *np = of_find_node_by_name(NULL, "cpus");
248 np = of_find_node_by_type(NULL, "cpu");
250 const unsigned int *l2cr =
251 of_get_property(np, "l2cr-value", NULL);
253 ppc_override_l2cr = 1;
254 ppc_override_l2cr_value = *l2cr;
256 _set_L2CR(ppc_override_l2cr_value);
262 if (ppc_override_l2cr)
263 printk(KERN_INFO "L2CR overridden (0x%x), "
264 "backside cache is %s\n",
265 ppc_override_l2cr_value,
266 (ppc_override_l2cr_value & 0x80000000)
267 ? "enabled" : "disabled");
271 static void __init pmac_setup_arch(void)
273 struct device_node *cpu, *ic;
277 pvr = PVR_VER(mfspr(SPRN_PVR));
279 /* Set loops_per_jiffy to a half-way reasonable value,
280 for use until calibrate_delay gets called. */
281 loops_per_jiffy = 50000000 / HZ;
282 cpu = of_find_node_by_type(NULL, "cpu");
284 fp = of_get_property(cpu, "clock-frequency", NULL);
286 if (pvr >= 0x30 && pvr < 0x80)
288 loops_per_jiffy = *fp / (3 * HZ);
289 else if (pvr == 4 || pvr >= 8)
290 /* 604, G3, G4 etc. */
291 loops_per_jiffy = *fp / HZ;
294 loops_per_jiffy = *fp / (2 * HZ);
299 /* See if newworld or oldworld */
300 ic = of_find_node_with_property(NULL, "interrupt-controller");
306 /* Lookup PCI hosts */
312 #endif /* CONFIG_PPC32 */
318 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
319 defined(CONFIG_PPC64)
323 #ifdef CONFIG_BLK_DEV_INITRD
325 ROOT_DEV = Root_RAM0;
328 ROOT_DEV = DEFAULT_ROOT_DEVICE;
332 if (strstr(boot_command_line, "adb_sync")) {
333 extern int __adb_probe_sync;
334 __adb_probe_sync = 1;
336 #endif /* CONFIG_ADB */
340 void note_scsi_host(struct device_node *node, void *host)
343 EXPORT_SYMBOL(note_scsi_host);
346 static int initializing = 1;
348 static int pmac_late_init(void)
353 machine_late_initcall(powermac, pmac_late_init);
356 * This is __ref because we check for "initializing" before
357 * touching any of the __init sensitive things and "initializing"
358 * will be false after __init time. This can't be __init because it
359 * can be called whenever a disk is first accessed.
361 void __ref note_bootable_part(dev_t dev, int part, int goodness)
367 if ((goodness <= current_root_goodness) &&
368 ROOT_DEV != DEFAULT_ROOT_DEVICE)
370 p = strstr(boot_command_line, "root=");
371 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
374 ROOT_DEV = dev + part;
375 current_root_goodness = goodness;
378 #ifdef CONFIG_ADB_CUDA
379 static void __noreturn cuda_restart(void)
381 struct adb_request req;
383 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
388 static void __noreturn cuda_shutdown(void)
390 struct adb_request req;
392 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
398 #define cuda_restart()
399 #define cuda_shutdown()
402 #ifndef CONFIG_ADB_PMU
403 #define pmu_restart()
404 #define pmu_shutdown()
407 #ifndef CONFIG_PMAC_SMU
408 #define smu_restart()
409 #define smu_shutdown()
412 static void __noreturn pmac_restart(char *cmd)
414 switch (sys_ctrler) {
415 case SYS_CTRLER_CUDA:
429 static void __noreturn pmac_power_off(void)
431 switch (sys_ctrler) {
432 case SYS_CTRLER_CUDA:
446 static void __noreturn
453 * Early initialization.
455 static void __init pmac_init(void)
457 /* Enable early btext debug if requested */
458 if (strstr(boot_command_line, "btextdbg")) {
459 udbg_adb_init_early();
460 register_early_udbg_console();
463 /* Probe motherboard chipset */
466 /* Initialize debug stuff */
467 udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
468 udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
471 iommu_init_early_dart(&pmac_pci_controller_ops);
474 /* SMP Init has to be done early as we need to patch up
475 * cpu_possible_mask before interrupt stacks are allocated
483 static int __init pmac_declare_of_platform_devices(void)
485 struct device_node *np;
487 np = of_find_node_by_name(NULL, "valkyrie");
489 of_platform_device_create(np, "valkyrie", NULL);
492 np = of_find_node_by_name(NULL, "platinum");
494 of_platform_device_create(np, "platinum", NULL);
497 np = of_find_node_by_type(NULL, "smu");
499 of_platform_device_create(np, "smu", NULL);
502 np = of_find_node_by_type(NULL, "fcu");
504 /* Some machines have strangely broken device-tree */
505 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
508 of_platform_device_create(np, "temperature", NULL);
514 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
516 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
518 * This is called very early, as part of console_init() (typically just after
519 * time_init()). This function is respondible for trying to find a good
520 * default console on serial ports. It tries to match the open firmware
521 * default output with one of the available serial console drivers.
523 static int __init check_pmac_serial_console(void)
525 struct device_node *prom_stdout = NULL;
528 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
529 char *devname = "ttyS";
531 char *devname = "ttyPZ";
534 pr_debug(" -> check_pmac_serial_console()\n");
536 /* The user has requested a console so this is already set up. */
537 if (strstr(boot_command_line, "console=")) {
538 pr_debug(" console was specified !\n");
543 pr_debug(" of_chosen is NULL !\n");
547 /* We are getting a weird phandle from OF ... */
548 /* ... So use the full path instead */
549 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
551 pr_debug(" no linux,stdout-path !\n");
554 prom_stdout = of_find_node_by_path(name);
556 pr_debug(" can't find stdout package %s !\n", name);
559 pr_debug("stdout is %s\n", prom_stdout->full_name);
561 name = of_get_property(prom_stdout, "name", NULL);
563 pr_debug(" stdout package has no name !\n");
567 if (strcmp(name, "ch-a") == 0)
569 else if (strcmp(name, "ch-b") == 0)
573 of_node_put(prom_stdout);
575 pr_debug("Found serial console at %s%d\n", devname, offset);
577 return add_preferred_console(devname, offset, NULL);
580 pr_debug("No preferred console found !\n");
581 of_node_put(prom_stdout);
584 console_initcall(check_pmac_serial_console);
586 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
589 * Called very early, MMU is off, device-tree isn't unflattened
591 static int __init pmac_probe(void)
593 if (!of_machine_is_compatible("Power Macintosh") &&
594 !of_machine_is_compatible("MacRISC"))
598 /* isa_io_base gets set in pmac_pci_init */
599 ISA_DMA_THRESHOLD = ~0L;
602 #endif /* CONFIG_PPC32 */
604 pm_power_off = pmac_power_off;
611 define_machine(powermac) {
614 .setup_arch = pmac_setup_arch,
615 .show_cpuinfo = pmac_show_cpuinfo,
616 .init_IRQ = pmac_pic_init,
617 .get_irq = NULL, /* changed later */
618 .pci_irq_fixup = pmac_pci_irq_fixup,
619 .restart = pmac_restart,
621 .time_init = pmac_time_init,
622 .get_boot_time = pmac_get_boot_time,
623 .set_rtc_time = pmac_set_rtc_time,
624 .get_rtc_time = pmac_get_rtc_time,
625 .calibrate_decr = pmac_calibrate_decr,
626 .feature_call = pmac_do_feature_call,
627 .progress = udbg_progress,
629 .power_save = power4_idle,
630 .enable_pmcs = power4_enable_pmcs,
631 #endif /* CONFIG_PPC64 */
633 .pcibios_after_init = pmac_pcibios_after_init,
634 .phys_mem_access_prot = pci_phys_mem_access_prot,