xref: /linux/arch/powerpc/platforms/powermac/setup.c (revision e5c86679d5e864947a52fb31e45a425dea3e7fa9) 
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 
56 #include <asm/reg.h>
57 #include <asm/sections.h>
58 #include <asm/prom.h>
59 #include <asm/pgtable.h>
60 #include <asm/io.h>
61 #include <asm/pci-bridge.h>
62 #include <asm/ohare.h>
63 #include <asm/mediabay.h>
64 #include <asm/machdep.h>
65 #include <asm/dma.h>
66 #include <asm/cputable.h>
67 #include <asm/btext.h>
68 #include <asm/pmac_feature.h>
69 #include <asm/time.h>
70 #include <asm/mmu_context.h>
71 #include <asm/iommu.h>
72 #include <asm/smu.h>
73 #include <asm/pmc.h>
74 #include <asm/udbg.h>
75 
76 #include "pmac.h"
77 
78 #undef SHOW_GATWICK_IRQS
79 
80 int ppc_override_l2cr = 0;
81 int ppc_override_l2cr_value;
82 int has_l2cache = 0;
83 
84 int pmac_newworld;
85 
86 static int current_root_goodness = -1;
87 
88 extern struct machdep_calls pmac_md;
89 
90 #define DEFAULT_ROOT_DEVICE Root_SDA1	/* sda1 - slightly silly choice */
91 
92 #ifdef CONFIG_PPC64
93 int sccdbg;
94 #endif
95 
96 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
97 EXPORT_SYMBOL(sys_ctrler);
98 
99 static void pmac_show_cpuinfo(struct seq_file *m)
100 {
101 	struct device_node *np;
102 	const char *pp;
103 	int plen;
104 	int mbmodel;
105 	unsigned int mbflags;
106 	char* mbname;
107 
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)
114 		mbname = "Unknown";
115 
116 	/* find motherboard type */
117 	seq_printf(m, "machine\t\t: ");
118 	np = of_find_node_by_path("/");
119 	if (np != NULL) {
120 		pp = of_get_property(np, "model", NULL);
121 		if (pp != NULL)
122 			seq_printf(m, "%s\n", pp);
123 		else
124 			seq_printf(m, "PowerMac\n");
125 		pp = of_get_property(np, "compatible", &plen);
126 		if (pp != NULL) {
127 			seq_printf(m, "motherboard\t:");
128 			while (plen > 0) {
129 				int l = strlen(pp) + 1;
130 				seq_printf(m, " %s", pp);
131 				plen -= l;
132 				pp += l;
133 			}
134 			seq_printf(m, "\n");
135 		}
136 		of_node_put(np);
137 	} else
138 		seq_printf(m, "PowerMac\n");
139 
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);
143 
144 	/* find l2 cache info */
145 	np = of_find_node_by_name(NULL, "l2-cache");
146 	if (np == NULL)
147 		np = of_find_node_by_type(NULL, "cache");
148 	if (np != NULL) {
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:");
154 		has_l2cache = 1;
155 		if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
156 			seq_printf(m, " %dK unified", *dc / 1024);
157 		} else {
158 			if (ic)
159 				seq_printf(m, " %dK instruction", *ic / 1024);
160 			if (dc)
161 				seq_printf(m, "%s %dK data",
162 					   (ic? " +": ""), *dc / 1024);
163 		}
164 		pp = of_get_property(np, "ram-type", NULL);
165 		if (pp)
166 			seq_printf(m, " %s", pp);
167 		seq_printf(m, "\n");
168 		of_node_put(np);
169 	}
170 
171 	/* Indicate newworld/oldworld */
172 	seq_printf(m, "pmac-generation\t: %s\n",
173 		   pmac_newworld ? "NewWorld" : "OldWorld");
174 }
175 
176 #ifndef CONFIG_ADB_CUDA
177 int find_via_cuda(void)
178 {
179 	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
180 
181 	if (!dn)
182 		return 0;
183 	of_node_put(dn);
184 	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
185 	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
186 	return 0;
187 }
188 #endif
189 
190 #ifndef CONFIG_ADB_PMU
191 int find_via_pmu(void)
192 {
193 	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
194 
195 	if (!dn)
196 		return 0;
197 	of_node_put(dn);
198 	printk("WARNING ! Your machine is PMU-based but your kernel\n");
199 	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
200 	return 0;
201 }
202 #endif
203 
204 #ifndef CONFIG_PMAC_SMU
205 int smu_init(void)
206 {
207 	/* should check and warn if SMU is present */
208 	return 0;
209 }
210 #endif
211 
212 #ifdef CONFIG_PPC32
213 static volatile u32 *sysctrl_regs;
214 
215 static void __init ohare_init(void)
216 {
217 	struct device_node *dn;
218 
219 	/* this area has the CPU identification register
220 	   and some registers used by smp boards */
221 	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
222 
223 	/*
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.
227 	 */
228 	dn = of_find_node_by_name(NULL, "ohare");
229 	if (dn) {
230 		of_node_put(dn);
231 		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
232 			if (sysctrl_regs[4] & 0x10)
233 				sysctrl_regs[4] |= 0x04000020;
234 			else
235 				sysctrl_regs[4] |= 0x04000000;
236 			if(has_l2cache)
237 				printk(KERN_INFO "Level 2 cache enabled\n");
238 		}
239 	}
240 }
241 
242 static void __init l2cr_init(void)
243 {
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");
247 		if (np == 0)
248 			np = of_find_node_by_type(NULL, "cpu");
249 		if (np != 0) {
250 			const unsigned int *l2cr =
251 				of_get_property(np, "l2cr-value", NULL);
252 			if (l2cr != 0) {
253 				ppc_override_l2cr = 1;
254 				ppc_override_l2cr_value = *l2cr;
255 				_set_L2CR(0);
256 				_set_L2CR(ppc_override_l2cr_value);
257 			}
258 			of_node_put(np);
259 		}
260 	}
261 
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");
268 }
269 #endif
270 
271 static void __init pmac_setup_arch(void)
272 {
273 	struct device_node *cpu, *ic;
274 	const int *fp;
275 	unsigned long pvr;
276 
277 	pvr = PVR_VER(mfspr(SPRN_PVR));
278 
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");
283 	if (cpu != NULL) {
284 		fp = of_get_property(cpu, "clock-frequency", NULL);
285 		if (fp != NULL) {
286 			if (pvr >= 0x30 && pvr < 0x80)
287 				/* PPC970 etc. */
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;
292 			else
293 				/* 601, 603, etc. */
294 				loops_per_jiffy = *fp / (2 * HZ);
295 		}
296 		of_node_put(cpu);
297 	}
298 
299 	/* See if newworld or oldworld */
300 	ic = of_find_node_with_property(NULL, "interrupt-controller");
301 	if (ic) {
302 		pmac_newworld = 1;
303 		of_node_put(ic);
304 	}
305 
306 	/* Lookup PCI hosts */
307 	pmac_pci_init();
308 
309 #ifdef CONFIG_PPC32
310 	ohare_init();
311 	l2cr_init();
312 #endif /* CONFIG_PPC32 */
313 
314 	find_via_cuda();
315 	find_via_pmu();
316 	smu_init();
317 
318 #if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
319     defined(CONFIG_PPC64)
320 	pmac_nvram_init();
321 #endif
322 #ifdef CONFIG_PPC32
323 #ifdef CONFIG_BLK_DEV_INITRD
324 	if (initrd_start)
325 		ROOT_DEV = Root_RAM0;
326 	else
327 #endif
328 		ROOT_DEV = DEFAULT_ROOT_DEVICE;
329 #endif
330 
331 #ifdef CONFIG_ADB
332 	if (strstr(boot_command_line, "adb_sync")) {
333 		extern int __adb_probe_sync;
334 		__adb_probe_sync = 1;
335 	}
336 #endif /* CONFIG_ADB */
337 }
338 
339 #ifdef CONFIG_SCSI
340 void note_scsi_host(struct device_node *node, void *host)
341 {
342 }
343 EXPORT_SYMBOL(note_scsi_host);
344 #endif
345 
346 static int initializing = 1;
347 
348 static int pmac_late_init(void)
349 {
350 	initializing = 0;
351 	return 0;
352 }
353 machine_late_initcall(powermac, pmac_late_init);
354 
355 /*
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.
360  */
361 void __ref note_bootable_part(dev_t dev, int part, int goodness)
362 {
363 	char *p;
364 
365 	if (!initializing)
366 		return;
367 	if ((goodness <= current_root_goodness) &&
368 	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
369 		return;
370 	p = strstr(boot_command_line, "root=");
371 	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
372 		return;
373 
374 	ROOT_DEV = dev + part;
375 	current_root_goodness = goodness;
376 }
377 
378 #ifdef CONFIG_ADB_CUDA
379 static void __noreturn cuda_restart(void)
380 {
381 	struct adb_request req;
382 
383 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
384 	for (;;)
385 		cuda_poll();
386 }
387 
388 static void __noreturn cuda_shutdown(void)
389 {
390 	struct adb_request req;
391 
392 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
393 	for (;;)
394 		cuda_poll();
395 }
396 
397 #else
398 #define cuda_restart()
399 #define cuda_shutdown()
400 #endif
401 
402 #ifndef CONFIG_ADB_PMU
403 #define pmu_restart()
404 #define pmu_shutdown()
405 #endif
406 
407 #ifndef CONFIG_PMAC_SMU
408 #define smu_restart()
409 #define smu_shutdown()
410 #endif
411 
412 static void __noreturn pmac_restart(char *cmd)
413 {
414 	switch (sys_ctrler) {
415 	case SYS_CTRLER_CUDA:
416 		cuda_restart();
417 		break;
418 	case SYS_CTRLER_PMU:
419 		pmu_restart();
420 		break;
421 	case SYS_CTRLER_SMU:
422 		smu_restart();
423 		break;
424 	default: ;
425 	}
426 	while (1) ;
427 }
428 
429 static void __noreturn pmac_power_off(void)
430 {
431 	switch (sys_ctrler) {
432 	case SYS_CTRLER_CUDA:
433 		cuda_shutdown();
434 		break;
435 	case SYS_CTRLER_PMU:
436 		pmu_shutdown();
437 		break;
438 	case SYS_CTRLER_SMU:
439 		smu_shutdown();
440 		break;
441 	default: ;
442 	}
443 	while (1) ;
444 }
445 
446 static void __noreturn
447 pmac_halt(void)
448 {
449 	pmac_power_off();
450 }
451 
452 /*
453  * Early initialization.
454  */
455 static void __init pmac_init(void)
456 {
457 	/* Enable early btext debug if requested */
458 	if (strstr(boot_command_line, "btextdbg")) {
459 		udbg_adb_init_early();
460 		register_early_udbg_console();
461 	}
462 
463 	/* Probe motherboard chipset */
464 	pmac_feature_init();
465 
466 	/* Initialize debug stuff */
467 	udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
468 	udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
469 
470 #ifdef CONFIG_PPC64
471 	iommu_init_early_dart(&pmac_pci_controller_ops);
472 #endif
473 
474 	/* SMP Init has to be done early as we need to patch up
475 	 * cpu_possible_mask before interrupt stacks are allocated
476 	 * or kaboom...
477 	 */
478 #ifdef CONFIG_SMP
479 	pmac_setup_smp();
480 #endif
481 }
482 
483 static int __init pmac_declare_of_platform_devices(void)
484 {
485 	struct device_node *np;
486 
487 	np = of_find_node_by_name(NULL, "valkyrie");
488 	if (np) {
489 		of_platform_device_create(np, "valkyrie", NULL);
490 		of_node_put(np);
491 	}
492 	np = of_find_node_by_name(NULL, "platinum");
493 	if (np) {
494 		of_platform_device_create(np, "platinum", NULL);
495 		of_node_put(np);
496 	}
497         np = of_find_node_by_type(NULL, "smu");
498         if (np) {
499 		of_platform_device_create(np, "smu", NULL);
500 		of_node_put(np);
501 	}
502 	np = of_find_node_by_type(NULL, "fcu");
503 	if (np == NULL) {
504 		/* Some machines have strangely broken device-tree */
505 		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
506 	}
507 	if (np) {
508 		of_platform_device_create(np, "temperature", NULL);
509 		of_node_put(np);
510 	}
511 
512 	return 0;
513 }
514 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
515 
516 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
517 /*
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.
522  */
523 static int __init check_pmac_serial_console(void)
524 {
525 	struct device_node *prom_stdout = NULL;
526 	int offset = 0;
527 	const char *name;
528 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
529 	char *devname = "ttyS";
530 #else
531 	char *devname = "ttyPZ";
532 #endif
533 
534 	pr_debug(" -> check_pmac_serial_console()\n");
535 
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");
539 		return -EBUSY;
540 	}
541 
542 	if (!of_chosen) {
543 		pr_debug(" of_chosen is NULL !\n");
544 		return -ENODEV;
545 	}
546 
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);
550 	if (name == NULL) {
551 		pr_debug(" no linux,stdout-path !\n");
552 		return -ENODEV;
553 	}
554 	prom_stdout = of_find_node_by_path(name);
555 	if (!prom_stdout) {
556 		pr_debug(" can't find stdout package %s !\n", name);
557 		return -ENODEV;
558 	}
559 	pr_debug("stdout is %s\n", prom_stdout->full_name);
560 
561 	name = of_get_property(prom_stdout, "name", NULL);
562 	if (!name) {
563 		pr_debug(" stdout package has no name !\n");
564 		goto not_found;
565 	}
566 
567 	if (strcmp(name, "ch-a") == 0)
568 		offset = 0;
569 	else if (strcmp(name, "ch-b") == 0)
570 		offset = 1;
571 	else
572 		goto not_found;
573 	of_node_put(prom_stdout);
574 
575 	pr_debug("Found serial console at %s%d\n", devname, offset);
576 
577 	return add_preferred_console(devname, offset, NULL);
578 
579  not_found:
580 	pr_debug("No preferred console found !\n");
581 	of_node_put(prom_stdout);
582 	return -ENODEV;
583 }
584 console_initcall(check_pmac_serial_console);
585 
586 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
587 
588 /*
589  * Called very early, MMU is off, device-tree isn't unflattened
590  */
591 static int __init pmac_probe(void)
592 {
593 	if (!of_machine_is_compatible("Power Macintosh") &&
594 	    !of_machine_is_compatible("MacRISC"))
595 		return 0;
596 
597 #ifdef CONFIG_PPC32
598 	/* isa_io_base gets set in pmac_pci_init */
599 	ISA_DMA_THRESHOLD = ~0L;
600 	DMA_MODE_READ = 1;
601 	DMA_MODE_WRITE = 2;
602 #endif /* CONFIG_PPC32 */
603 
604 	pm_power_off = pmac_power_off;
605 
606 	pmac_init();
607 
608 	return 1;
609 }
610 
611 define_machine(powermac) {
612 	.name			= "PowerMac",
613 	.probe			= pmac_probe,
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,
620 	.halt			= pmac_halt,
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,
628 #ifdef CONFIG_PPC64
629 	.power_save		= power4_idle,
630 	.enable_pmcs		= power4_enable_pmcs,
631 #endif /* CONFIG_PPC64 */
632 #ifdef CONFIG_PPC32
633 	.pcibios_after_init	= pmac_pcibios_after_init,
634 	.phys_mem_access_prot	= pci_phys_mem_access_prot,
635 #endif
636 };
637