xref: /linux/arch/powerpc/platforms/powermac/setup.c (revision b43ab901d671e3e3cad425ea5e9a3c74e266dcdd) 
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/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>
56 
57 #include <asm/reg.h>
58 #include <asm/sections.h>
59 #include <asm/prom.h>
60 #include <asm/system.h>
61 #include <asm/pgtable.h>
62 #include <asm/io.h>
63 #include <asm/pci-bridge.h>
64 #include <asm/ohare.h>
65 #include <asm/mediabay.h>
66 #include <asm/machdep.h>
67 #include <asm/dma.h>
68 #include <asm/cputable.h>
69 #include <asm/btext.h>
70 #include <asm/pmac_feature.h>
71 #include <asm/time.h>
72 #include <asm/mmu_context.h>
73 #include <asm/iommu.h>
74 #include <asm/smu.h>
75 #include <asm/pmc.h>
76 #include <asm/udbg.h>
77 
78 #include "pmac.h"
79 
80 #undef SHOW_GATWICK_IRQS
81 
82 int ppc_override_l2cr = 0;
83 int ppc_override_l2cr_value;
84 int has_l2cache = 0;
85 
86 int pmac_newworld;
87 
88 static int current_root_goodness = -1;
89 
90 extern struct machdep_calls pmac_md;
91 
92 #define DEFAULT_ROOT_DEVICE Root_SDA1	/* sda1 - slightly silly choice */
93 
94 #ifdef CONFIG_PPC64
95 int sccdbg;
96 #endif
97 
98 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
99 EXPORT_SYMBOL(sys_ctrler);
100 
101 #ifdef CONFIG_PMAC_SMU
102 unsigned long smu_cmdbuf_abs;
103 EXPORT_SYMBOL(smu_cmdbuf_abs);
104 #endif
105 
106 static void pmac_show_cpuinfo(struct seq_file *m)
107 {
108 	struct device_node *np;
109 	const char *pp;
110 	int plen;
111 	int mbmodel;
112 	unsigned int mbflags;
113 	char* mbname;
114 
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)
121 		mbname = "Unknown";
122 
123 	/* find motherboard type */
124 	seq_printf(m, "machine\t\t: ");
125 	np = of_find_node_by_path("/");
126 	if (np != NULL) {
127 		pp = of_get_property(np, "model", NULL);
128 		if (pp != NULL)
129 			seq_printf(m, "%s\n", pp);
130 		else
131 			seq_printf(m, "PowerMac\n");
132 		pp = of_get_property(np, "compatible", &plen);
133 		if (pp != NULL) {
134 			seq_printf(m, "motherboard\t:");
135 			while (plen > 0) {
136 				int l = strlen(pp) + 1;
137 				seq_printf(m, " %s", pp);
138 				plen -= l;
139 				pp += l;
140 			}
141 			seq_printf(m, "\n");
142 		}
143 		of_node_put(np);
144 	} else
145 		seq_printf(m, "PowerMac\n");
146 
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);
150 
151 	/* find l2 cache info */
152 	np = of_find_node_by_name(NULL, "l2-cache");
153 	if (np == NULL)
154 		np = of_find_node_by_type(NULL, "cache");
155 	if (np != NULL) {
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:");
161 		has_l2cache = 1;
162 		if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
163 			seq_printf(m, " %dK unified", *dc / 1024);
164 		} else {
165 			if (ic)
166 				seq_printf(m, " %dK instruction", *ic / 1024);
167 			if (dc)
168 				seq_printf(m, "%s %dK data",
169 					   (ic? " +": ""), *dc / 1024);
170 		}
171 		pp = of_get_property(np, "ram-type", NULL);
172 		if (pp)
173 			seq_printf(m, " %s", pp);
174 		seq_printf(m, "\n");
175 		of_node_put(np);
176 	}
177 
178 	/* Indicate newworld/oldworld */
179 	seq_printf(m, "pmac-generation\t: %s\n",
180 		   pmac_newworld ? "NewWorld" : "OldWorld");
181 }
182 
183 #ifndef CONFIG_ADB_CUDA
184 int find_via_cuda(void)
185 {
186 	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
187 
188 	if (!dn)
189 		return 0;
190 	of_node_put(dn);
191 	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
192 	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
193 	return 0;
194 }
195 #endif
196 
197 #ifndef CONFIG_ADB_PMU
198 int find_via_pmu(void)
199 {
200 	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
201 
202 	if (!dn)
203 		return 0;
204 	of_node_put(dn);
205 	printk("WARNING ! Your machine is PMU-based but your kernel\n");
206 	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
207 	return 0;
208 }
209 #endif
210 
211 #ifndef CONFIG_PMAC_SMU
212 int smu_init(void)
213 {
214 	/* should check and warn if SMU is present */
215 	return 0;
216 }
217 #endif
218 
219 #ifdef CONFIG_PPC32
220 static volatile u32 *sysctrl_regs;
221 
222 static void __init ohare_init(void)
223 {
224 	struct device_node *dn;
225 
226 	/* this area has the CPU identification register
227 	   and some registers used by smp boards */
228 	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
229 
230 	/*
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.
234 	 */
235 	dn = of_find_node_by_name(NULL, "ohare");
236 	if (dn) {
237 		of_node_put(dn);
238 		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
239 			if (sysctrl_regs[4] & 0x10)
240 				sysctrl_regs[4] |= 0x04000020;
241 			else
242 				sysctrl_regs[4] |= 0x04000000;
243 			if(has_l2cache)
244 				printk(KERN_INFO "Level 2 cache enabled\n");
245 		}
246 	}
247 }
248 
249 static void __init l2cr_init(void)
250 {
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");
254 		if (np == 0)
255 			np = of_find_node_by_type(NULL, "cpu");
256 		if (np != 0) {
257 			const unsigned int *l2cr =
258 				of_get_property(np, "l2cr-value", NULL);
259 			if (l2cr != 0) {
260 				ppc_override_l2cr = 1;
261 				ppc_override_l2cr_value = *l2cr;
262 				_set_L2CR(0);
263 				_set_L2CR(ppc_override_l2cr_value);
264 			}
265 			of_node_put(np);
266 		}
267 	}
268 
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");
275 }
276 #endif
277 
278 static void __init pmac_setup_arch(void)
279 {
280 	struct device_node *cpu, *ic;
281 	const int *fp;
282 	unsigned long pvr;
283 
284 	pvr = PVR_VER(mfspr(SPRN_PVR));
285 
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");
290 	if (cpu != NULL) {
291 		fp = of_get_property(cpu, "clock-frequency", NULL);
292 		if (fp != NULL) {
293 			if (pvr >= 0x30 && pvr < 0x80)
294 				/* PPC970 etc. */
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;
299 			else
300 				/* 601, 603, etc. */
301 				loops_per_jiffy = *fp / (2 * HZ);
302 		}
303 		of_node_put(cpu);
304 	}
305 
306 	/* See if newworld or oldworld */
307 	ic = of_find_node_with_property(NULL, "interrupt-controller");
308 	if (ic) {
309 		pmac_newworld = 1;
310 		of_node_put(ic);
311 	}
312 
313 	/* Lookup PCI hosts */
314 	pmac_pci_init();
315 
316 #ifdef CONFIG_PPC32
317 	ohare_init();
318 	l2cr_init();
319 #endif /* CONFIG_PPC32 */
320 
321 	find_via_cuda();
322 	find_via_pmu();
323 	smu_init();
324 
325 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
326     defined(CONFIG_PPC64)
327 	pmac_nvram_init();
328 #endif
329 
330 #ifdef CONFIG_PPC32
331 #ifdef CONFIG_BLK_DEV_INITRD
332 	if (initrd_start)
333 		ROOT_DEV = Root_RAM0;
334 	else
335 #endif
336 		ROOT_DEV = DEFAULT_ROOT_DEVICE;
337 #endif
338 
339 #ifdef CONFIG_ADB
340 	if (strstr(cmd_line, "adb_sync")) {
341 		extern int __adb_probe_sync;
342 		__adb_probe_sync = 1;
343 	}
344 #endif /* CONFIG_ADB */
345 }
346 
347 #ifdef CONFIG_SCSI
348 void note_scsi_host(struct device_node *node, void *host)
349 {
350 }
351 EXPORT_SYMBOL(note_scsi_host);
352 #endif
353 
354 static int initializing = 1;
355 
356 static int pmac_late_init(void)
357 {
358 	initializing = 0;
359 	return 0;
360 }
361 machine_late_initcall(powermac, pmac_late_init);
362 
363 /*
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.
368  */
369 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
370 {
371 	char *p;
372 
373 	if (!initializing)
374 		return;
375 	if ((goodness <= current_root_goodness) &&
376 	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
377 		return;
378 	p = strstr(boot_command_line, "root=");
379 	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
380 		return;
381 
382 	ROOT_DEV = dev + part;
383 	current_root_goodness = goodness;
384 }
385 
386 #ifdef CONFIG_ADB_CUDA
387 static void cuda_restart(void)
388 {
389 	struct adb_request req;
390 
391 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
392 	for (;;)
393 		cuda_poll();
394 }
395 
396 static void cuda_shutdown(void)
397 {
398 	struct adb_request req;
399 
400 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
401 	for (;;)
402 		cuda_poll();
403 }
404 
405 #else
406 #define cuda_restart()
407 #define cuda_shutdown()
408 #endif
409 
410 #ifndef CONFIG_ADB_PMU
411 #define pmu_restart()
412 #define pmu_shutdown()
413 #endif
414 
415 #ifndef CONFIG_PMAC_SMU
416 #define smu_restart()
417 #define smu_shutdown()
418 #endif
419 
420 static void pmac_restart(char *cmd)
421 {
422 	switch (sys_ctrler) {
423 	case SYS_CTRLER_CUDA:
424 		cuda_restart();
425 		break;
426 	case SYS_CTRLER_PMU:
427 		pmu_restart();
428 		break;
429 	case SYS_CTRLER_SMU:
430 		smu_restart();
431 		break;
432 	default: ;
433 	}
434 }
435 
436 static void pmac_power_off(void)
437 {
438 	switch (sys_ctrler) {
439 	case SYS_CTRLER_CUDA:
440 		cuda_shutdown();
441 		break;
442 	case SYS_CTRLER_PMU:
443 		pmu_shutdown();
444 		break;
445 	case SYS_CTRLER_SMU:
446 		smu_shutdown();
447 		break;
448 	default: ;
449 	}
450 }
451 
452 static void
453 pmac_halt(void)
454 {
455 	pmac_power_off();
456 }
457 
458 /*
459  * Early initialization.
460  */
461 static void __init pmac_init_early(void)
462 {
463 	/* Enable early btext debug if requested */
464 	if (strstr(cmd_line, "btextdbg")) {
465 		udbg_adb_init_early();
466 		register_early_udbg_console();
467 	}
468 
469 	/* Probe motherboard chipset */
470 	pmac_feature_init();
471 
472 	/* Initialize debug stuff */
473 	udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
474 	udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
475 
476 #ifdef CONFIG_PPC64
477 	iommu_init_early_dart();
478 #endif
479 
480 	/* SMP Init has to be done early as we need to patch up
481 	 * cpu_possible_mask before interrupt stacks are allocated
482 	 * or kaboom...
483 	 */
484 #ifdef CONFIG_SMP
485 	pmac_setup_smp();
486 #endif
487 }
488 
489 static int __init pmac_declare_of_platform_devices(void)
490 {
491 	struct device_node *np;
492 
493 	if (machine_is(chrp))
494 		return -1;
495 
496 	np = of_find_node_by_name(NULL, "valkyrie");
497 	if (np) {
498 		of_platform_device_create(np, "valkyrie", NULL);
499 		of_node_put(np);
500 	}
501 	np = of_find_node_by_name(NULL, "platinum");
502 	if (np) {
503 		of_platform_device_create(np, "platinum", NULL);
504 		of_node_put(np);
505 	}
506         np = of_find_node_by_type(NULL, "smu");
507         if (np) {
508 		of_platform_device_create(np, "smu", NULL);
509 		of_node_put(np);
510 	}
511 	np = of_find_node_by_type(NULL, "fcu");
512 	if (np == NULL) {
513 		/* Some machines have strangely broken device-tree */
514 		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
515 	}
516 	if (np) {
517 		of_platform_device_create(np, "temperature", NULL);
518 		of_node_put(np);
519 	}
520 
521 	return 0;
522 }
523 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
524 
525 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
526 /*
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.
531  */
532 static int __init check_pmac_serial_console(void)
533 {
534 	struct device_node *prom_stdout = NULL;
535 	int offset = 0;
536 	const char *name;
537 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
538 	char *devname = "ttyS";
539 #else
540 	char *devname = "ttyPZ";
541 #endif
542 
543 	pr_debug(" -> check_pmac_serial_console()\n");
544 
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");
548 		return -EBUSY;
549 	}
550 
551 	if (!of_chosen) {
552 		pr_debug(" of_chosen is NULL !\n");
553 		return -ENODEV;
554 	}
555 
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);
559 	if (name == NULL) {
560 		pr_debug(" no linux,stdout-path !\n");
561 		return -ENODEV;
562 	}
563 	prom_stdout = of_find_node_by_path(name);
564 	if (!prom_stdout) {
565 		pr_debug(" can't find stdout package %s !\n", name);
566 		return -ENODEV;
567 	}
568 	pr_debug("stdout is %s\n", prom_stdout->full_name);
569 
570 	name = of_get_property(prom_stdout, "name", NULL);
571 	if (!name) {
572 		pr_debug(" stdout package has no name !\n");
573 		goto not_found;
574 	}
575 
576 	if (strcmp(name, "ch-a") == 0)
577 		offset = 0;
578 	else if (strcmp(name, "ch-b") == 0)
579 		offset = 1;
580 	else
581 		goto not_found;
582 	of_node_put(prom_stdout);
583 
584 	pr_debug("Found serial console at %s%d\n", devname, offset);
585 
586 	return add_preferred_console(devname, offset, NULL);
587 
588  not_found:
589 	pr_debug("No preferred console found !\n");
590 	of_node_put(prom_stdout);
591 	return -ENODEV;
592 }
593 console_initcall(check_pmac_serial_console);
594 
595 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
596 
597 /*
598  * Called very early, MMU is off, device-tree isn't unflattened
599  */
600 static int __init pmac_probe(void)
601 {
602 	unsigned long root = of_get_flat_dt_root();
603 
604 	if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
605 	    !of_flat_dt_is_compatible(root, "MacRISC"))
606 		return 0;
607 
608 #ifdef CONFIG_PPC64
609 	/*
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
614 	 */
615 	alloc_dart_table();
616 
617 	hpte_init_native();
618 #endif
619 
620 #ifdef CONFIG_PPC32
621 	/* isa_io_base gets set in pmac_pci_init */
622 	ISA_DMA_THRESHOLD = ~0L;
623 	DMA_MODE_READ = 1;
624 	DMA_MODE_WRITE = 2;
625 #endif /* CONFIG_PPC32 */
626 
627 #ifdef CONFIG_PMAC_SMU
628 	/*
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.
632 	 */
633 	smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
634 #endif /* CONFIG_PMAC_SMU */
635 
636 	return 1;
637 }
638 
639 #ifdef CONFIG_PPC64
640 /* Move that to pci.c */
641 static int pmac_pci_probe_mode(struct pci_bus *bus)
642 {
643 	struct device_node *node = pci_bus_to_OF_node(bus);
644 
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.
648 	 */
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;
654 }
655 #endif /* CONFIG_PPC64 */
656 
657 define_machine(powermac) {
658 	.name			= "PowerMac",
659 	.probe			= pmac_probe,
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,
668 	.halt			= pmac_halt,
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,
676 #ifdef CONFIG_PPC64
677 	.pci_probe_mode		= pmac_pci_probe_mode,
678 	.power_save		= power4_idle,
679 	.enable_pmcs		= power4_enable_pmcs,
680 #endif /* CONFIG_PPC64 */
681 #ifdef CONFIG_PPC32
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,
685 #endif
686 };
687