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) && 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;
247 
248 		for_each_of_cpu_node(np) {
249 			const unsigned int *l2cr =
250 				of_get_property(np, "l2cr-value", NULL);
251 			if (l2cr) {
252 				ppc_override_l2cr = 1;
253 				ppc_override_l2cr_value = *l2cr;
254 				_set_L2CR(0);
255 				_set_L2CR(ppc_override_l2cr_value);
256 			}
257 			of_node_put(np);
258 			break;
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 
283 	for_each_of_cpu_node(cpu) {
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 			of_node_put(cpu);
296 			break;
297 		}
298 	}
299 
300 	/* See if newworld or oldworld */
301 	ic = of_find_node_with_property(NULL, "interrupt-controller");
302 	if (ic) {
303 		pmac_newworld = 1;
304 		of_node_put(ic);
305 	}
306 
307 	/* Lookup PCI hosts */
308 	pmac_pci_init();
309 
310 #ifdef CONFIG_PPC32
311 	ohare_init();
312 	l2cr_init();
313 #endif /* CONFIG_PPC32 */
314 
315 	find_via_cuda();
316 	find_via_pmu();
317 	smu_init();
318 
319 #if IS_ENABLED(CONFIG_NVRAM)
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 void note_bootable_part(dev_t dev, int part, int goodness);
356 /*
357  * This is __ref because we check for "initializing" before
358  * touching any of the __init sensitive things and "initializing"
359  * will be false after __init time. This can't be __init because it
360  * can be called whenever a disk is first accessed.
361  */
362 void __ref note_bootable_part(dev_t dev, int part, int goodness)
363 {
364 	char *p;
365 
366 	if (!initializing)
367 		return;
368 	if ((goodness <= current_root_goodness) &&
369 	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
370 		return;
371 	p = strstr(boot_command_line, "root=");
372 	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
373 		return;
374 
375 	ROOT_DEV = dev + part;
376 	current_root_goodness = goodness;
377 }
378 
379 #ifdef CONFIG_ADB_CUDA
380 static void __noreturn cuda_restart(void)
381 {
382 	struct adb_request req;
383 
384 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
385 	for (;;)
386 		cuda_poll();
387 }
388 
389 static void __noreturn cuda_shutdown(void)
390 {
391 	struct adb_request req;
392 
393 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
394 	for (;;)
395 		cuda_poll();
396 }
397 
398 #else
399 #define cuda_restart()
400 #define cuda_shutdown()
401 #endif
402 
403 #ifndef CONFIG_ADB_PMU
404 #define pmu_restart()
405 #define pmu_shutdown()
406 #endif
407 
408 #ifndef CONFIG_PMAC_SMU
409 #define smu_restart()
410 #define smu_shutdown()
411 #endif
412 
413 static void __noreturn pmac_restart(char *cmd)
414 {
415 	switch (sys_ctrler) {
416 	case SYS_CTRLER_CUDA:
417 		cuda_restart();
418 		break;
419 	case SYS_CTRLER_PMU:
420 		pmu_restart();
421 		break;
422 	case SYS_CTRLER_SMU:
423 		smu_restart();
424 		break;
425 	default: ;
426 	}
427 	while (1) ;
428 }
429 
430 static void __noreturn pmac_power_off(void)
431 {
432 	switch (sys_ctrler) {
433 	case SYS_CTRLER_CUDA:
434 		cuda_shutdown();
435 		break;
436 	case SYS_CTRLER_PMU:
437 		pmu_shutdown();
438 		break;
439 	case SYS_CTRLER_SMU:
440 		smu_shutdown();
441 		break;
442 	default: ;
443 	}
444 	while (1) ;
445 }
446 
447 static void __noreturn
448 pmac_halt(void)
449 {
450 	pmac_power_off();
451 }
452 
453 /*
454  * Early initialization.
455  */
456 static void __init pmac_init(void)
457 {
458 	/* Enable early btext debug if requested */
459 	if (strstr(boot_command_line, "btextdbg")) {
460 		udbg_adb_init_early();
461 		register_early_udbg_console();
462 	}
463 
464 	/* Probe motherboard chipset */
465 	pmac_feature_init();
466 
467 	/* Initialize debug stuff */
468 	udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
469 	udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
470 
471 #ifdef CONFIG_PPC64
472 	iommu_init_early_dart(&pmac_pci_controller_ops);
473 #endif
474 
475 	/* SMP Init has to be done early as we need to patch up
476 	 * cpu_possible_mask before interrupt stacks are allocated
477 	 * or kaboom...
478 	 */
479 #ifdef CONFIG_SMP
480 	pmac_setup_smp();
481 #endif
482 }
483 
484 static int __init pmac_declare_of_platform_devices(void)
485 {
486 	struct device_node *np;
487 
488 	np = of_find_node_by_name(NULL, "valkyrie");
489 	if (np) {
490 		of_platform_device_create(np, "valkyrie", NULL);
491 		of_node_put(np);
492 	}
493 	np = of_find_node_by_name(NULL, "platinum");
494 	if (np) {
495 		of_platform_device_create(np, "platinum", NULL);
496 		of_node_put(np);
497 	}
498         np = of_find_node_by_type(NULL, "smu");
499         if (np) {
500 		of_platform_device_create(np, "smu", NULL);
501 		of_node_put(np);
502 	}
503 	np = of_find_node_by_type(NULL, "fcu");
504 	if (np == NULL) {
505 		/* Some machines have strangely broken device-tree */
506 		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
507 	}
508 	if (np) {
509 		of_platform_device_create(np, "temperature", NULL);
510 		of_node_put(np);
511 	}
512 
513 	return 0;
514 }
515 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
516 
517 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
518 /*
519  * This is called very early, as part of console_init() (typically just after
520  * time_init()). This function is respondible for trying to find a good
521  * default console on serial ports. It tries to match the open firmware
522  * default output with one of the available serial console drivers.
523  */
524 static int __init check_pmac_serial_console(void)
525 {
526 	struct device_node *prom_stdout = NULL;
527 	int offset = 0;
528 	const char *name;
529 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
530 	char *devname = "ttyS";
531 #else
532 	char *devname = "ttyPZ";
533 #endif
534 
535 	pr_debug(" -> check_pmac_serial_console()\n");
536 
537 	/* The user has requested a console so this is already set up. */
538 	if (strstr(boot_command_line, "console=")) {
539 		pr_debug(" console was specified !\n");
540 		return -EBUSY;
541 	}
542 
543 	if (!of_chosen) {
544 		pr_debug(" of_chosen is NULL !\n");
545 		return -ENODEV;
546 	}
547 
548 	/* We are getting a weird phandle from OF ... */
549 	/* ... So use the full path instead */
550 	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
551 	if (name == NULL) {
552 		pr_debug(" no linux,stdout-path !\n");
553 		return -ENODEV;
554 	}
555 	prom_stdout = of_find_node_by_path(name);
556 	if (!prom_stdout) {
557 		pr_debug(" can't find stdout package %s !\n", name);
558 		return -ENODEV;
559 	}
560 	pr_debug("stdout is %pOF\n", prom_stdout);
561 
562 	if (of_node_name_eq(prom_stdout, "ch-a"))
563 		offset = 0;
564 	else if (of_node_name_eq(prom_stdout, "ch-b"))
565 		offset = 1;
566 	else
567 		goto not_found;
568 	of_node_put(prom_stdout);
569 
570 	pr_debug("Found serial console at %s%d\n", devname, offset);
571 
572 	return add_preferred_console(devname, offset, NULL);
573 
574  not_found:
575 	pr_debug("No preferred console found !\n");
576 	of_node_put(prom_stdout);
577 	return -ENODEV;
578 }
579 console_initcall(check_pmac_serial_console);
580 
581 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
582 
583 /*
584  * Called very early, MMU is off, device-tree isn't unflattened
585  */
586 static int __init pmac_probe(void)
587 {
588 	if (!of_machine_is_compatible("Power Macintosh") &&
589 	    !of_machine_is_compatible("MacRISC"))
590 		return 0;
591 
592 #ifdef CONFIG_PPC32
593 	/* isa_io_base gets set in pmac_pci_init */
594 	ISA_DMA_THRESHOLD = ~0L;
595 	DMA_MODE_READ = 1;
596 	DMA_MODE_WRITE = 2;
597 #endif /* CONFIG_PPC32 */
598 
599 	pm_power_off = pmac_power_off;
600 
601 	pmac_init();
602 
603 	return 1;
604 }
605 
606 define_machine(powermac) {
607 	.name			= "PowerMac",
608 	.probe			= pmac_probe,
609 	.setup_arch		= pmac_setup_arch,
610 	.show_cpuinfo		= pmac_show_cpuinfo,
611 	.init_IRQ		= pmac_pic_init,
612 	.get_irq		= NULL,	/* changed later */
613 	.pci_irq_fixup		= pmac_pci_irq_fixup,
614 	.restart		= pmac_restart,
615 	.halt			= pmac_halt,
616 	.time_init		= pmac_time_init,
617 	.get_boot_time		= pmac_get_boot_time,
618 	.set_rtc_time		= pmac_set_rtc_time,
619 	.get_rtc_time		= pmac_get_rtc_time,
620 	.calibrate_decr		= pmac_calibrate_decr,
621 	.feature_call		= pmac_do_feature_call,
622 	.progress		= udbg_progress,
623 #ifdef CONFIG_PPC64
624 	.power_save		= power4_idle,
625 	.enable_pmcs		= power4_enable_pmcs,
626 #endif /* CONFIG_PPC64 */
627 #ifdef CONFIG_PPC32
628 	.pcibios_after_init	= pmac_pcibios_after_init,
629 	.phys_mem_access_prot	= pci_phys_mem_access_prot,
630 #endif
631 };
632