1 /*
2 * Powermac setup and early boot code plus other random bits.
3 *
4 * PowerPC version
5 * Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 *
7 * Adapted for Power Macintosh by Paul Mackerras
8 * Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
9 *
10 * Derived from "arch/alpha/kernel/setup.c"
11 * Copyright (C) 1995 Linus Torvalds
12 *
13 * Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
14 *
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.
19 *
20 */
21
22 /*
23 * bootup setup stuff..
24 */
25
26 #include <linux/init.h>
27 #include <linux/errno.h>
28 #include <linux/sched.h>
29 #include <linux/kernel.h>
30 #include <linux/mm.h>
31 #include <linux/stddef.h>
32 #include <linux/unistd.h>
33 #include <linux/ptrace.h>
34 #include <linux/user.h>
35 #include <linux/tty.h>
36 #include <linux/string.h>
37 #include <linux/delay.h>
38 #include <linux/ioport.h>
39 #include <linux/major.h>
40 #include <linux/initrd.h>
41 #include <linux/vt_kern.h>
42 #include <linux/console.h>
43 #include <linux/pci.h>
44 #include <linux/adb.h>
45 #include <linux/cuda.h>
46 #include <linux/pmu.h>
47 #include <linux/irq.h>
48 #include <linux/seq_file.h>
49 #include <linux/root_dev.h>
50 #include <linux/bitops.h>
51 #include <linux/suspend.h>
52 #include <linux/of_device.h>
53 #include <linux/of_platform.h>
54 #include <linux/memblock.h>
55
56 #include <asm/reg.h>
57 #include <asm/sections.h>
58 #include <asm/prom.h>
59 #include <asm/system.h>
60 #include <asm/pgtable.h>
61 #include <asm/io.h>
62 #include <asm/pci-bridge.h>
63 #include <asm/ohare.h>
64 #include <asm/mediabay.h>
65 #include <asm/machdep.h>
66 #include <asm/dma.h>
67 #include <asm/cputable.h>
68 #include <asm/btext.h>
69 #include <asm/pmac_feature.h>
70 #include <asm/time.h>
71 #include <asm/mmu_context.h>
72 #include <asm/iommu.h>
73 #include <asm/smu.h>
74 #include <asm/pmc.h>
75 #include <asm/udbg.h>
76
77 #include "pmac.h"
78
79 #undef SHOW_GATWICK_IRQS
80
81 int ppc_override_l2cr = 0;
82 int ppc_override_l2cr_value;
83 int has_l2cache = 0;
84
85 int pmac_newworld;
86
87 static int current_root_goodness = -1;
88
89 extern struct machdep_calls pmac_md;
90
91 #define DEFAULT_ROOT_DEVICE Root_SDA1 /* sda1 - slightly silly choice */
92
93 #ifdef CONFIG_PPC64
94 int sccdbg;
95 #endif
96
97 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
98 EXPORT_SYMBOL(sys_ctrler);
99
100 #ifdef CONFIG_PMAC_SMU
101 unsigned long smu_cmdbuf_abs;
102 EXPORT_SYMBOL(smu_cmdbuf_abs);
103 #endif
104
pmac_show_cpuinfo(struct seq_file * m)105 static void pmac_show_cpuinfo(struct seq_file *m)
106 {
107 struct device_node *np;
108 const char *pp;
109 int plen;
110 int mbmodel;
111 unsigned int mbflags;
112 char* mbname;
113
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)
120 mbname = "Unknown";
121
122 /* find motherboard type */
123 seq_printf(m, "machine\t\t: ");
124 np = of_find_node_by_path("/");
125 if (np != NULL) {
126 pp = of_get_property(np, "model", NULL);
127 if (pp != NULL)
128 seq_printf(m, "%s\n", pp);
129 else
130 seq_printf(m, "PowerMac\n");
131 pp = of_get_property(np, "compatible", &plen);
132 if (pp != NULL) {
133 seq_printf(m, "motherboard\t:");
134 while (plen > 0) {
135 int l = strlen(pp) + 1;
136 seq_printf(m, " %s", pp);
137 plen -= l;
138 pp += l;
139 }
140 seq_printf(m, "\n");
141 }
142 of_node_put(np);
143 } else
144 seq_printf(m, "PowerMac\n");
145
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);
149
150 /* find l2 cache info */
151 np = of_find_node_by_name(NULL, "l2-cache");
152 if (np == NULL)
153 np = of_find_node_by_type(NULL, "cache");
154 if (np != NULL) {
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:");
160 has_l2cache = 1;
161 if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
162 seq_printf(m, " %dK unified", *dc / 1024);
163 } else {
164 if (ic)
165 seq_printf(m, " %dK instruction", *ic / 1024);
166 if (dc)
167 seq_printf(m, "%s %dK data",
168 (ic? " +": ""), *dc / 1024);
169 }
170 pp = of_get_property(np, "ram-type", NULL);
171 if (pp)
172 seq_printf(m, " %s", pp);
173 seq_printf(m, "\n");
174 of_node_put(np);
175 }
176
177 /* Indicate newworld/oldworld */
178 seq_printf(m, "pmac-generation\t: %s\n",
179 pmac_newworld ? "NewWorld" : "OldWorld");
180 }
181
182 #ifndef CONFIG_ADB_CUDA
find_via_cuda(void)183 int find_via_cuda(void)
184 {
185 struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
186
187 if (!dn)
188 return 0;
189 of_node_put(dn);
190 printk("WARNING ! Your machine is CUDA-based but your kernel\n");
191 printk(" wasn't compiled with CONFIG_ADB_CUDA option !\n");
192 return 0;
193 }
194 #endif
195
196 #ifndef CONFIG_ADB_PMU
find_via_pmu(void)197 int find_via_pmu(void)
198 {
199 struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
200
201 if (!dn)
202 return 0;
203 of_node_put(dn);
204 printk("WARNING ! Your machine is PMU-based but your kernel\n");
205 printk(" wasn't compiled with CONFIG_ADB_PMU option !\n");
206 return 0;
207 }
208 #endif
209
210 #ifndef CONFIG_PMAC_SMU
smu_init(void)211 int smu_init(void)
212 {
213 /* should check and warn if SMU is present */
214 return 0;
215 }
216 #endif
217
218 #ifdef CONFIG_PPC32
219 static volatile u32 *sysctrl_regs;
220
ohare_init(void)221 static void __init ohare_init(void)
222 {
223 struct device_node *dn;
224
225 /* this area has the CPU identification register
226 and some registers used by smp boards */
227 sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
228
229 /*
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.
233 */
234 dn = of_find_node_by_name(NULL, "ohare");
235 if (dn) {
236 of_node_put(dn);
237 if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
238 if (sysctrl_regs[4] & 0x10)
239 sysctrl_regs[4] |= 0x04000020;
240 else
241 sysctrl_regs[4] |= 0x04000000;
242 if(has_l2cache)
243 printk(KERN_INFO "Level 2 cache enabled\n");
244 }
245 }
246 }
247
l2cr_init(void)248 static void __init l2cr_init(void)
249 {
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");
253 if (np == 0)
254 np = of_find_node_by_type(NULL, "cpu");
255 if (np != 0) {
256 const unsigned int *l2cr =
257 of_get_property(np, "l2cr-value", NULL);
258 if (l2cr != 0) {
259 ppc_override_l2cr = 1;
260 ppc_override_l2cr_value = *l2cr;
261 _set_L2CR(0);
262 _set_L2CR(ppc_override_l2cr_value);
263 }
264 of_node_put(np);
265 }
266 }
267
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");
274 }
275 #endif
276
pmac_setup_arch(void)277 static void __init pmac_setup_arch(void)
278 {
279 struct device_node *cpu, *ic;
280 const int *fp;
281 unsigned long pvr;
282
283 pvr = PVR_VER(mfspr(SPRN_PVR));
284
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");
289 if (cpu != NULL) {
290 fp = of_get_property(cpu, "clock-frequency", NULL);
291 if (fp != NULL) {
292 if (pvr >= 0x30 && pvr < 0x80)
293 /* PPC970 etc. */
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;
298 else
299 /* 601, 603, etc. */
300 loops_per_jiffy = *fp / (2 * HZ);
301 }
302 of_node_put(cpu);
303 }
304
305 /* See if newworld or oldworld */
306 ic = of_find_node_with_property(NULL, "interrupt-controller");
307 if (ic) {
308 pmac_newworld = 1;
309 of_node_put(ic);
310 }
311
312 /* Lookup PCI hosts */
313 pmac_pci_init();
314
315 #ifdef CONFIG_PPC32
316 ohare_init();
317 l2cr_init();
318 #endif /* CONFIG_PPC32 */
319
320 find_via_cuda();
321 find_via_pmu();
322 smu_init();
323
324 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
325 defined(CONFIG_PPC64)
326 pmac_nvram_init();
327 #endif
328
329 #ifdef CONFIG_PPC32
330 #ifdef CONFIG_BLK_DEV_INITRD
331 if (initrd_start)
332 ROOT_DEV = Root_RAM0;
333 else
334 #endif
335 ROOT_DEV = DEFAULT_ROOT_DEVICE;
336 #endif
337
338 #ifdef CONFIG_ADB
339 if (strstr(cmd_line, "adb_sync")) {
340 extern int __adb_probe_sync;
341 __adb_probe_sync = 1;
342 }
343 #endif /* CONFIG_ADB */
344 }
345
346 #ifdef CONFIG_SCSI
note_scsi_host(struct device_node * node,void * host)347 void note_scsi_host(struct device_node *node, void *host)
348 {
349 }
350 EXPORT_SYMBOL(note_scsi_host);
351 #endif
352
353 static int initializing = 1;
354
pmac_late_init(void)355 static int pmac_late_init(void)
356 {
357 initializing = 0;
358 /* this is udbg (which is __init) and we can later use it during
359 * cpu hotplug (in smp_core99_kick_cpu) */
360 ppc_md.progress = NULL;
361 return 0;
362 }
363 machine_late_initcall(powermac, pmac_late_init);
364
365 /*
366 * This is __init_refok because we check for "initializing" before
367 * touching any of the __init sensitive things and "initializing"
368 * will be false after __init time. This can't be __init because it
369 * can be called whenever a disk is first accessed.
370 */
note_bootable_part(dev_t dev,int part,int goodness)371 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
372 {
373 char *p;
374
375 if (!initializing)
376 return;
377 if ((goodness <= current_root_goodness) &&
378 ROOT_DEV != DEFAULT_ROOT_DEVICE)
379 return;
380 p = strstr(boot_command_line, "root=");
381 if (p != NULL && (p == boot_command_line || p[-1] == ' '))
382 return;
383
384 ROOT_DEV = dev + part;
385 current_root_goodness = goodness;
386 }
387
388 #ifdef CONFIG_ADB_CUDA
cuda_restart(void)389 static void cuda_restart(void)
390 {
391 struct adb_request req;
392
393 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
394 for (;;)
395 cuda_poll();
396 }
397
cuda_shutdown(void)398 static void cuda_shutdown(void)
399 {
400 struct adb_request req;
401
402 cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
403 for (;;)
404 cuda_poll();
405 }
406
407 #else
408 #define cuda_restart()
409 #define cuda_shutdown()
410 #endif
411
412 #ifndef CONFIG_ADB_PMU
413 #define pmu_restart()
414 #define pmu_shutdown()
415 #endif
416
417 #ifndef CONFIG_PMAC_SMU
418 #define smu_restart()
419 #define smu_shutdown()
420 #endif
421
pmac_restart(char * cmd)422 static void pmac_restart(char *cmd)
423 {
424 switch (sys_ctrler) {
425 case SYS_CTRLER_CUDA:
426 cuda_restart();
427 break;
428 case SYS_CTRLER_PMU:
429 pmu_restart();
430 break;
431 case SYS_CTRLER_SMU:
432 smu_restart();
433 break;
434 default: ;
435 }
436 }
437
pmac_power_off(void)438 static void pmac_power_off(void)
439 {
440 switch (sys_ctrler) {
441 case SYS_CTRLER_CUDA:
442 cuda_shutdown();
443 break;
444 case SYS_CTRLER_PMU:
445 pmu_shutdown();
446 break;
447 case SYS_CTRLER_SMU:
448 smu_shutdown();
449 break;
450 default: ;
451 }
452 }
453
454 static void
pmac_halt(void)455 pmac_halt(void)
456 {
457 pmac_power_off();
458 }
459
460 /*
461 * Early initialization.
462 */
pmac_init_early(void)463 static void __init pmac_init_early(void)
464 {
465 /* Enable early btext debug if requested */
466 if (strstr(cmd_line, "btextdbg")) {
467 udbg_adb_init_early();
468 register_early_udbg_console();
469 }
470
471 /* Probe motherboard chipset */
472 pmac_feature_init();
473
474 /* Initialize debug stuff */
475 udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
476 udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
477
478 #ifdef CONFIG_PPC64
479 iommu_init_early_dart();
480 #endif
481
482 /* SMP Init has to be done early as we need to patch up
483 * cpu_possible_mask before interrupt stacks are allocated
484 * or kaboom...
485 */
486 #ifdef CONFIG_SMP
487 pmac_setup_smp();
488 #endif
489 }
490
pmac_declare_of_platform_devices(void)491 static int __init pmac_declare_of_platform_devices(void)
492 {
493 struct device_node *np;
494
495 if (machine_is(chrp))
496 return -1;
497
498 np = of_find_node_by_name(NULL, "valkyrie");
499 if (np)
500 of_platform_device_create(np, "valkyrie", NULL);
501 np = of_find_node_by_name(NULL, "platinum");
502 if (np)
503 of_platform_device_create(np, "platinum", NULL);
504 np = of_find_node_by_type(NULL, "smu");
505 if (np) {
506 of_platform_device_create(np, "smu", NULL);
507 of_node_put(np);
508 }
509 np = of_find_node_by_type(NULL, "fcu");
510 if (np == NULL) {
511 /* Some machines have strangely broken device-tree */
512 np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
513 }
514 if (np) {
515 of_platform_device_create(np, "temperature", NULL);
516 of_node_put(np);
517 }
518
519 return 0;
520 }
521 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
522
523 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
524 /*
525 * This is called very early, as part of console_init() (typically just after
526 * time_init()). This function is respondible for trying to find a good
527 * default console on serial ports. It tries to match the open firmware
528 * default output with one of the available serial console drivers.
529 */
check_pmac_serial_console(void)530 static int __init check_pmac_serial_console(void)
531 {
532 struct device_node *prom_stdout = NULL;
533 int offset = 0;
534 const char *name;
535 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
536 char *devname = "ttyS";
537 #else
538 char *devname = "ttyPZ";
539 #endif
540
541 pr_debug(" -> check_pmac_serial_console()\n");
542
543 /* The user has requested a console so this is already set up. */
544 if (strstr(boot_command_line, "console=")) {
545 pr_debug(" console was specified !\n");
546 return -EBUSY;
547 }
548
549 if (!of_chosen) {
550 pr_debug(" of_chosen is NULL !\n");
551 return -ENODEV;
552 }
553
554 /* We are getting a weird phandle from OF ... */
555 /* ... So use the full path instead */
556 name = of_get_property(of_chosen, "linux,stdout-path", NULL);
557 if (name == NULL) {
558 pr_debug(" no linux,stdout-path !\n");
559 return -ENODEV;
560 }
561 prom_stdout = of_find_node_by_path(name);
562 if (!prom_stdout) {
563 pr_debug(" can't find stdout package %s !\n", name);
564 return -ENODEV;
565 }
566 pr_debug("stdout is %s\n", prom_stdout->full_name);
567
568 name = of_get_property(prom_stdout, "name", NULL);
569 if (!name) {
570 pr_debug(" stdout package has no name !\n");
571 goto not_found;
572 }
573
574 if (strcmp(name, "ch-a") == 0)
575 offset = 0;
576 else if (strcmp(name, "ch-b") == 0)
577 offset = 1;
578 else
579 goto not_found;
580 of_node_put(prom_stdout);
581
582 pr_debug("Found serial console at %s%d\n", devname, offset);
583
584 return add_preferred_console(devname, offset, NULL);
585
586 not_found:
587 pr_debug("No preferred console found !\n");
588 of_node_put(prom_stdout);
589 return -ENODEV;
590 }
591 console_initcall(check_pmac_serial_console);
592
593 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
594
595 /*
596 * Called very early, MMU is off, device-tree isn't unflattened
597 */
pmac_probe(void)598 static int __init pmac_probe(void)
599 {
600 unsigned long root = of_get_flat_dt_root();
601
602 if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
603 !of_flat_dt_is_compatible(root, "MacRISC"))
604 return 0;
605
606 #ifdef CONFIG_PPC64
607 /*
608 * On U3, the DART (iommu) must be allocated now since it
609 * has an impact on htab_initialize (due to the large page it
610 * occupies having to be broken up so the DART itself is not
611 * part of the cacheable linar mapping
612 */
613 alloc_dart_table();
614
615 hpte_init_native();
616 #endif
617
618 #ifdef CONFIG_PPC32
619 /* isa_io_base gets set in pmac_pci_init */
620 ISA_DMA_THRESHOLD = ~0L;
621 DMA_MODE_READ = 1;
622 DMA_MODE_WRITE = 2;
623 #endif /* CONFIG_PPC32 */
624
625 #ifdef CONFIG_PMAC_SMU
626 /*
627 * SMU based G5s need some memory below 2Gb, at least the current
628 * driver needs that. We have to allocate it now. We allocate 4k
629 * (1 small page) for now.
630 */
631 smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
632 #endif /* CONFIG_PMAC_SMU */
633
634 return 1;
635 }
636
637 #ifdef CONFIG_PPC64
638 /* Move that to pci.c */
pmac_pci_probe_mode(struct pci_bus * bus)639 static int pmac_pci_probe_mode(struct pci_bus *bus)
640 {
641 struct device_node *node = pci_bus_to_OF_node(bus);
642
643 /* We need to use normal PCI probing for the AGP bus,
644 * since the device for the AGP bridge isn't in the tree.
645 * Same for the PCIe host on U4 and the HT host bridge.
646 */
647 if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
648 of_device_is_compatible(node, "u4-pcie") ||
649 of_device_is_compatible(node, "u3-ht")))
650 return PCI_PROBE_NORMAL;
651 return PCI_PROBE_DEVTREE;
652 }
653 #endif /* CONFIG_PPC64 */
654
define_machine(powermac)655 define_machine(powermac) {
656 .name = "PowerMac",
657 .probe = pmac_probe,
658 .setup_arch = pmac_setup_arch,
659 .init_early = pmac_init_early,
660 .show_cpuinfo = pmac_show_cpuinfo,
661 .init_IRQ = pmac_pic_init,
662 .get_irq = NULL, /* changed later */
663 .pci_irq_fixup = pmac_pci_irq_fixup,
664 .restart = pmac_restart,
665 .power_off = pmac_power_off,
666 .halt = pmac_halt,
667 .time_init = pmac_time_init,
668 .get_boot_time = pmac_get_boot_time,
669 .set_rtc_time = pmac_set_rtc_time,
670 .get_rtc_time = pmac_get_rtc_time,
671 .calibrate_decr = pmac_calibrate_decr,
672 .feature_call = pmac_do_feature_call,
673 .progress = udbg_progress,
674 #ifdef CONFIG_PPC64
675 .pci_probe_mode = pmac_pci_probe_mode,
676 .power_save = power4_idle,
677 .enable_pmcs = power4_enable_pmcs,
678 #endif /* CONFIG_PPC64 */
679 #ifdef CONFIG_PPC32
680 .pcibios_enable_device_hook = pmac_pci_enable_device_hook,
681 .pcibios_after_init = pmac_pcibios_after_init,
682 .phys_mem_access_prot = pci_phys_mem_access_prot,
683 #endif
684 };
685