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/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 
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
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
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
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 
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 
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 
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
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 
355 static int pmac_late_init(void)
356 {
357 	initializing = 0;
358 	return 0;
359 }
360 machine_late_initcall(powermac, pmac_late_init);
361 
362 /*
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.
367  */
368 void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
369 {
370 	char *p;
371 
372 	if (!initializing)
373 		return;
374 	if ((goodness <= current_root_goodness) &&
375 	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
376 		return;
377 	p = strstr(boot_command_line, "root=");
378 	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
379 		return;
380 
381 	ROOT_DEV = dev + part;
382 	current_root_goodness = goodness;
383 }
384 
385 #ifdef CONFIG_ADB_CUDA
386 static void cuda_restart(void)
387 {
388 	struct adb_request req;
389 
390 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
391 	for (;;)
392 		cuda_poll();
393 }
394 
395 static void cuda_shutdown(void)
396 {
397 	struct adb_request req;
398 
399 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
400 	for (;;)
401 		cuda_poll();
402 }
403 
404 #else
405 #define cuda_restart()
406 #define cuda_shutdown()
407 #endif
408 
409 #ifndef CONFIG_ADB_PMU
410 #define pmu_restart()
411 #define pmu_shutdown()
412 #endif
413 
414 #ifndef CONFIG_PMAC_SMU
415 #define smu_restart()
416 #define smu_shutdown()
417 #endif
418 
419 static void pmac_restart(char *cmd)
420 {
421 	switch (sys_ctrler) {
422 	case SYS_CTRLER_CUDA:
423 		cuda_restart();
424 		break;
425 	case SYS_CTRLER_PMU:
426 		pmu_restart();
427 		break;
428 	case SYS_CTRLER_SMU:
429 		smu_restart();
430 		break;
431 	default: ;
432 	}
433 }
434 
435 static void pmac_power_off(void)
436 {
437 	switch (sys_ctrler) {
438 	case SYS_CTRLER_CUDA:
439 		cuda_shutdown();
440 		break;
441 	case SYS_CTRLER_PMU:
442 		pmu_shutdown();
443 		break;
444 	case SYS_CTRLER_SMU:
445 		smu_shutdown();
446 		break;
447 	default: ;
448 	}
449 }
450 
451 static void
452 pmac_halt(void)
453 {
454 	pmac_power_off();
455 }
456 
457 /*
458  * Early initialization.
459  */
460 static void __init pmac_init_early(void)
461 {
462 	/* Enable early btext debug if requested */
463 	if (strstr(cmd_line, "btextdbg")) {
464 		udbg_adb_init_early();
465 		register_early_udbg_console();
466 	}
467 
468 	/* Probe motherboard chipset */
469 	pmac_feature_init();
470 
471 	/* Initialize debug stuff */
472 	udbg_scc_init(!!strstr(cmd_line, "sccdbg"));
473 	udbg_adb_init(!!strstr(cmd_line, "btextdbg"));
474 
475 #ifdef CONFIG_PPC64
476 	iommu_init_early_dart();
477 #endif
478 
479 	/* SMP Init has to be done early as we need to patch up
480 	 * cpu_possible_mask before interrupt stacks are allocated
481 	 * or kaboom...
482 	 */
483 #ifdef CONFIG_SMP
484 	pmac_setup_smp();
485 #endif
486 }
487 
488 static int __init pmac_declare_of_platform_devices(void)
489 {
490 	struct device_node *np;
491 
492 	if (machine_is(chrp))
493 		return -1;
494 
495 	np = of_find_node_by_name(NULL, "valkyrie");
496 	if (np) {
497 		of_platform_device_create(np, "valkyrie", NULL);
498 		of_node_put(np);
499 	}
500 	np = of_find_node_by_name(NULL, "platinum");
501 	if (np) {
502 		of_platform_device_create(np, "platinum", NULL);
503 		of_node_put(np);
504 	}
505         np = of_find_node_by_type(NULL, "smu");
506         if (np) {
507 		of_platform_device_create(np, "smu", NULL);
508 		of_node_put(np);
509 	}
510 	np = of_find_node_by_type(NULL, "fcu");
511 	if (np == NULL) {
512 		/* Some machines have strangely broken device-tree */
513 		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
514 	}
515 	if (np) {
516 		of_platform_device_create(np, "temperature", NULL);
517 		of_node_put(np);
518 	}
519 
520 	return 0;
521 }
522 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
523 
524 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
525 /*
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.
530  */
531 static int __init check_pmac_serial_console(void)
532 {
533 	struct device_node *prom_stdout = NULL;
534 	int offset = 0;
535 	const char *name;
536 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
537 	char *devname = "ttyS";
538 #else
539 	char *devname = "ttyPZ";
540 #endif
541 
542 	pr_debug(" -> check_pmac_serial_console()\n");
543 
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");
547 		return -EBUSY;
548 	}
549 
550 	if (!of_chosen) {
551 		pr_debug(" of_chosen is NULL !\n");
552 		return -ENODEV;
553 	}
554 
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);
558 	if (name == NULL) {
559 		pr_debug(" no linux,stdout-path !\n");
560 		return -ENODEV;
561 	}
562 	prom_stdout = of_find_node_by_path(name);
563 	if (!prom_stdout) {
564 		pr_debug(" can't find stdout package %s !\n", name);
565 		return -ENODEV;
566 	}
567 	pr_debug("stdout is %s\n", prom_stdout->full_name);
568 
569 	name = of_get_property(prom_stdout, "name", NULL);
570 	if (!name) {
571 		pr_debug(" stdout package has no name !\n");
572 		goto not_found;
573 	}
574 
575 	if (strcmp(name, "ch-a") == 0)
576 		offset = 0;
577 	else if (strcmp(name, "ch-b") == 0)
578 		offset = 1;
579 	else
580 		goto not_found;
581 	of_node_put(prom_stdout);
582 
583 	pr_debug("Found serial console at %s%d\n", devname, offset);
584 
585 	return add_preferred_console(devname, offset, NULL);
586 
587  not_found:
588 	pr_debug("No preferred console found !\n");
589 	of_node_put(prom_stdout);
590 	return -ENODEV;
591 }
592 console_initcall(check_pmac_serial_console);
593 
594 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
595 
596 /*
597  * Called very early, MMU is off, device-tree isn't unflattened
598  */
599 static int __init pmac_probe(void)
600 {
601 	unsigned long root = of_get_flat_dt_root();
602 
603 	if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
604 	    !of_flat_dt_is_compatible(root, "MacRISC"))
605 		return 0;
606 
607 #ifdef CONFIG_PPC64
608 	/*
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
613 	 */
614 	alloc_dart_table();
615 
616 	hpte_init_native();
617 #endif
618 
619 #ifdef CONFIG_PPC32
620 	/* isa_io_base gets set in pmac_pci_init */
621 	ISA_DMA_THRESHOLD = ~0L;
622 	DMA_MODE_READ = 1;
623 	DMA_MODE_WRITE = 2;
624 #endif /* CONFIG_PPC32 */
625 
626 #ifdef CONFIG_PMAC_SMU
627 	/*
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.
631 	 */
632 	smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
633 #endif /* CONFIG_PMAC_SMU */
634 
635 	return 1;
636 }
637 
638 #ifdef CONFIG_PPC64
639 /* Move that to pci.c */
640 static int pmac_pci_probe_mode(struct pci_bus *bus)
641 {
642 	struct device_node *node = pci_bus_to_OF_node(bus);
643 
644 	/* We need to use normal PCI probing for the AGP bus,
645 	 * since the device for the AGP bridge isn't in the tree.
646 	 * Same for the PCIe host on U4 and the HT host bridge.
647 	 */
648 	if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
649 				  of_device_is_compatible(node, "u4-pcie") ||
650 				  of_device_is_compatible(node, "u3-ht")))
651 		return PCI_PROBE_NORMAL;
652 	return PCI_PROBE_DEVTREE;
653 }
654 #endif /* CONFIG_PPC64 */
655 
656 define_machine(powermac) {
657 	.name			= "PowerMac",
658 	.probe			= pmac_probe,
659 	.setup_arch		= pmac_setup_arch,
660 	.init_early		= pmac_init_early,
661 	.show_cpuinfo		= pmac_show_cpuinfo,
662 	.init_IRQ		= pmac_pic_init,
663 	.get_irq		= NULL,	/* changed later */
664 	.pci_irq_fixup		= pmac_pci_irq_fixup,
665 	.restart		= pmac_restart,
666 	.power_off		= pmac_power_off,
667 	.halt			= pmac_halt,
668 	.time_init		= pmac_time_init,
669 	.get_boot_time		= pmac_get_boot_time,
670 	.set_rtc_time		= pmac_set_rtc_time,
671 	.get_rtc_time		= pmac_get_rtc_time,
672 	.calibrate_decr		= pmac_calibrate_decr,
673 	.feature_call		= pmac_do_feature_call,
674 	.progress		= udbg_progress,
675 #ifdef CONFIG_PPC64
676 	.pci_probe_mode		= pmac_pci_probe_mode,
677 	.power_save		= power4_idle,
678 	.enable_pmcs		= power4_enable_pmcs,
679 #endif /* CONFIG_PPC64 */
680 #ifdef CONFIG_PPC32
681 	.pcibios_enable_device_hook = pmac_pci_enable_device_hook,
682 	.pcibios_after_init	= pmac_pcibios_after_init,
683 	.phys_mem_access_prot	= pci_phys_mem_access_prot,
684 #endif
685 };
686