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/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)
361 machine_late_initcall(powermac, pmac_late_init);
364 * This is __init_refok because we check for "initializing" before
365 * touching any of the __init sensitive things and "initializing"
366 * will be false after __init time. This can't be __init because it
367 * can be called whenever a disk is first accessed.
369 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
375 if ((goodness <= current_root_goodness) &&
376 ROOT_DEV != DEFAULT_ROOT_DEVICE)
378 p = strstr(boot_command_line, "root=");
379 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
382 ROOT_DEV = dev + part;
383 current_root_goodness = goodness;
386 #ifdef CONFIG_ADB_CUDA
387 static void cuda_restart(void)
389 struct adb_request req;
391 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
396 static void cuda_shutdown(void)
398 struct adb_request req;
400 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
406 #define cuda_restart()
407 #define cuda_shutdown()
410 #ifndef CONFIG_ADB_PMU
411 #define pmu_restart()
412 #define pmu_shutdown()
415 #ifndef CONFIG_PMAC_SMU
416 #define smu_restart()
417 #define smu_shutdown()
420 static void pmac_restart(char *cmd)
422 switch (sys_ctrler) {
423 case SYS_CTRLER_CUDA:
436 static void pmac_power_off(void)
438 switch (sys_ctrler) {
439 case SYS_CTRLER_CUDA:
459 * Early initialization.
461 static void __init pmac_init_early(void)
463 /* Enable early btext debug if requested */
464 if (strstr(cmd_line, "btextdbg")) {
465 udbg_adb_init_early();
466 register_early_udbg_console();
469 /* Probe motherboard chipset */
472 /* Initialize debug stuff */
473 udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
474 udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
477 iommu_init_early_dart();
480 /* SMP Init has to be done early as we need to patch up
481 * cpu_possible_mask before interrupt stacks are allocated
489 static int __init pmac_declare_of_platform_devices(void)
491 struct device_node *np;
493 if (machine_is(chrp))
496 np = of_find_node_by_name(NULL, "valkyrie");
498 of_platform_device_create(np, "valkyrie", NULL);
501 np = of_find_node_by_name(NULL, "platinum");
503 of_platform_device_create(np, "platinum", NULL);
506 np = of_find_node_by_type(NULL, "smu");
508 of_platform_device_create(np, "smu", NULL);
511 np = of_find_node_by_type(NULL, "fcu");
513 /* Some machines have strangely broken device-tree */
514 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
517 of_platform_device_create(np, "temperature", NULL);
523 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
525 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
527 * This is called very early, as part of console_init() (typically just after
528 * time_init()). This function is respondible for trying to find a good
529 * default console on serial ports. It tries to match the open firmware
530 * default output with one of the available serial console drivers.
532 static int __init check_pmac_serial_console(void)
534 struct device_node *prom_stdout = NULL;
537 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
538 char *devname = "ttyS";
540 char *devname = "ttyPZ";
543 pr_debug(" -> check_pmac_serial_console()\n");
545 /* The user has requested a console so this is already set up. */
546 if (strstr(boot_command_line, "console=")) {
547 pr_debug(" console was specified !\n");
552 pr_debug(" of_chosen is NULL !\n");
556 /* We are getting a weird phandle from OF ... */
557 /* ... So use the full path instead */
558 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
560 pr_debug(" no linux,stdout-path !\n");
563 prom_stdout = of_find_node_by_path(name);
565 pr_debug(" can't find stdout package %s !\n", name);
568 pr_debug("stdout is %s\n", prom_stdout->full_name);
570 name = of_get_property(prom_stdout, "name", NULL);
572 pr_debug(" stdout package has no name !\n");
576 if (strcmp(name, "ch-a") == 0)
578 else if (strcmp(name, "ch-b") == 0)
582 of_node_put(prom_stdout);
584 pr_debug("Found serial console at %s%d\n", devname, offset);
586 return add_preferred_console(devname, offset, NULL);
589 pr_debug("No preferred console found !\n");
590 of_node_put(prom_stdout);
593 console_initcall(check_pmac_serial_console);
595 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
598 * Called very early, MMU is off, device-tree isn't unflattened
600 static int __init pmac_probe(void)
602 unsigned long root = of_get_flat_dt_root();
604 if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
605 !of_flat_dt_is_compatible(root, "MacRISC"))
610 * On U3, the DART (iommu) must be allocated now since it
611 * has an impact on htab_initialize (due to the large page it
612 * occupies having to be broken up so the DART itself is not
613 * part of the cacheable linar mapping
621 /* isa_io_base gets set in pmac_pci_init */
622 ISA_DMA_THRESHOLD = ~0L;
625 #endif /* CONFIG_PPC32 */
627 #ifdef CONFIG_PMAC_SMU
629 * SMU based G5s need some memory below 2Gb, at least the current
630 * driver needs that. We have to allocate it now. We allocate 4k
631 * (1 small page) for now.
633 smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
634 #endif /* CONFIG_PMAC_SMU */
640 /* Move that to pci.c */
641 static int pmac_pci_probe_mode(struct pci_bus *bus)
643 struct device_node *node = pci_bus_to_OF_node(bus);
645 /* We need to use normal PCI probing for the AGP bus,
646 * since the device for the AGP bridge isn't in the tree.
647 * Same for the PCIe host on U4 and the HT host bridge.
649 if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
650 of_device_is_compatible(node, "u4-pcie") ||
651 of_device_is_compatible(node, "u3-ht")))
652 return PCI_PROBE_NORMAL;
653 return PCI_PROBE_DEVTREE;
655 #endif /* CONFIG_PPC64 */
657 define_machine(powermac) {
660 .setup_arch = pmac_setup_arch,
661 .init_early = pmac_init_early,
662 .show_cpuinfo = pmac_show_cpuinfo,
663 .init_IRQ = pmac_pic_init,
664 .get_irq = NULL, /* changed later */
665 .pci_irq_fixup = pmac_pci_irq_fixup,
666 .restart = pmac_restart,
667 .power_off = pmac_power_off,
669 .time_init = pmac_time_init,
670 .get_boot_time = pmac_get_boot_time,
671 .set_rtc_time = pmac_set_rtc_time,
672 .get_rtc_time = pmac_get_rtc_time,
673 .calibrate_decr = pmac_calibrate_decr,
674 .feature_call = pmac_do_feature_call,
675 .progress = udbg_progress,
677 .pci_probe_mode = pmac_pci_probe_mode,
678 .power_save = power4_idle,
679 .enable_pmcs = power4_enable_pmcs,
680 #endif /* CONFIG_PPC64 */
682 .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
683 .pcibios_after_init = pmac_pcibios_after_init,
684 .phys_mem_access_prot = pci_phys_mem_access_prot,