1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  Powermac setup and early boot code plus other random bits.
4  *
5  *  PowerPC version
6  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
7  *
8  *  Adapted for Power Macintosh by Paul Mackerras
9  *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
10  *
11  *  Derived from "arch/alpha/kernel/setup.c"
12  *    Copyright (C) 1995 Linus Torvalds
13  *
14  *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
15  */
16 
17 /*
18  * bootup setup stuff..
19  */
20 
21 #include <linux/init.h>
22 #include <linux/errno.h>
23 #include <linux/sched.h>
24 #include <linux/kernel.h>
25 #include <linux/mm.h>
26 #include <linux/stddef.h>
27 #include <linux/unistd.h>
28 #include <linux/ptrace.h>
29 #include <linux/export.h>
30 #include <linux/user.h>
31 #include <linux/tty.h>
32 #include <linux/string.h>
33 #include <linux/delay.h>
34 #include <linux/ioport.h>
35 #include <linux/major.h>
36 #include <linux/initrd.h>
37 #include <linux/vt_kern.h>
38 #include <linux/console.h>
39 #include <linux/pci.h>
40 #include <linux/adb.h>
41 #include <linux/cuda.h>
42 #include <linux/pmu.h>
43 #include <linux/irq.h>
44 #include <linux/seq_file.h>
45 #include <linux/root_dev.h>
46 #include <linux/bitops.h>
47 #include <linux/suspend.h>
48 #include <linux/of_device.h>
49 #include <linux/of_platform.h>
50 
51 #include <asm/reg.h>
52 #include <asm/sections.h>
53 #include <asm/prom.h>
54 #include <asm/io.h>
55 #include <asm/pci-bridge.h>
56 #include <asm/ohare.h>
57 #include <asm/mediabay.h>
58 #include <asm/machdep.h>
59 #include <asm/dma.h>
60 #include <asm/cputable.h>
61 #include <asm/btext.h>
62 #include <asm/pmac_feature.h>
63 #include <asm/time.h>
64 #include <asm/mmu_context.h>
65 #include <asm/iommu.h>
66 #include <asm/smu.h>
67 #include <asm/pmc.h>
68 #include <asm/udbg.h>
69 
70 #include "pmac.h"
71 
72 #undef SHOW_GATWICK_IRQS
73 
74 int ppc_override_l2cr = 0;
75 int ppc_override_l2cr_value;
76 int has_l2cache = 0;
77 
78 int pmac_newworld;
79 
80 static int current_root_goodness = -1;
81 
82 extern struct machdep_calls pmac_md;
83 
84 #define DEFAULT_ROOT_DEVICE Root_SDA1	/* sda1 - slightly silly choice */
85 
86 #ifdef CONFIG_PPC64
87 int sccdbg;
88 #endif
89 
90 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
91 EXPORT_SYMBOL(sys_ctrler);
92 
93 static void pmac_show_cpuinfo(struct seq_file *m)
94 {
95 	struct device_node *np;
96 	const char *pp;
97 	int plen;
98 	int mbmodel;
99 	unsigned int mbflags;
100 	char* mbname;
101 
102 	mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
103 				    PMAC_MB_INFO_MODEL, 0);
104 	mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
105 				    PMAC_MB_INFO_FLAGS, 0);
106 	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
107 			      (long) &mbname) != 0)
108 		mbname = "Unknown";
109 
110 	/* find motherboard type */
111 	seq_printf(m, "machine\t\t: ");
112 	np = of_find_node_by_path("/");
113 	if (np != NULL) {
114 		pp = of_get_property(np, "model", NULL);
115 		if (pp != NULL)
116 			seq_printf(m, "%s\n", pp);
117 		else
118 			seq_printf(m, "PowerMac\n");
119 		pp = of_get_property(np, "compatible", &plen);
120 		if (pp != NULL) {
121 			seq_printf(m, "motherboard\t:");
122 			while (plen > 0) {
123 				int l = strlen(pp) + 1;
124 				seq_printf(m, " %s", pp);
125 				plen -= l;
126 				pp += l;
127 			}
128 			seq_printf(m, "\n");
129 		}
130 		of_node_put(np);
131 	} else
132 		seq_printf(m, "PowerMac\n");
133 
134 	/* print parsed model */
135 	seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
136 	seq_printf(m, "pmac flags\t: %08x\n", mbflags);
137 
138 	/* find l2 cache info */
139 	np = of_find_node_by_name(NULL, "l2-cache");
140 	if (np == NULL)
141 		np = of_find_node_by_type(NULL, "cache");
142 	if (np != NULL) {
143 		const unsigned int *ic =
144 			of_get_property(np, "i-cache-size", NULL);
145 		const unsigned int *dc =
146 			of_get_property(np, "d-cache-size", NULL);
147 		seq_printf(m, "L2 cache\t:");
148 		has_l2cache = 1;
149 		if (of_get_property(np, "cache-unified", NULL) && dc) {
150 			seq_printf(m, " %dK unified", *dc / 1024);
151 		} else {
152 			if (ic)
153 				seq_printf(m, " %dK instruction", *ic / 1024);
154 			if (dc)
155 				seq_printf(m, "%s %dK data",
156 					   (ic? " +": ""), *dc / 1024);
157 		}
158 		pp = of_get_property(np, "ram-type", NULL);
159 		if (pp)
160 			seq_printf(m, " %s", pp);
161 		seq_printf(m, "\n");
162 		of_node_put(np);
163 	}
164 
165 	/* Indicate newworld/oldworld */
166 	seq_printf(m, "pmac-generation\t: %s\n",
167 		   pmac_newworld ? "NewWorld" : "OldWorld");
168 }
169 
170 #ifndef CONFIG_ADB_CUDA
171 int find_via_cuda(void)
172 {
173 	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
174 
175 	if (!dn)
176 		return 0;
177 	of_node_put(dn);
178 	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
179 	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
180 	return 0;
181 }
182 #endif
183 
184 #ifndef CONFIG_ADB_PMU
185 int find_via_pmu(void)
186 {
187 	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
188 
189 	if (!dn)
190 		return 0;
191 	of_node_put(dn);
192 	printk("WARNING ! Your machine is PMU-based but your kernel\n");
193 	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
194 	return 0;
195 }
196 #endif
197 
198 #ifndef CONFIG_PMAC_SMU
199 int smu_init(void)
200 {
201 	/* should check and warn if SMU is present */
202 	return 0;
203 }
204 #endif
205 
206 #ifdef CONFIG_PPC32
207 static volatile u32 *sysctrl_regs;
208 
209 static void __init ohare_init(void)
210 {
211 	struct device_node *dn;
212 
213 	/* this area has the CPU identification register
214 	   and some registers used by smp boards */
215 	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
216 
217 	/*
218 	 * Turn on the L2 cache.
219 	 * We assume that we have a PSX memory controller iff
220 	 * we have an ohare I/O controller.
221 	 */
222 	dn = of_find_node_by_name(NULL, "ohare");
223 	if (dn) {
224 		of_node_put(dn);
225 		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
226 			if (sysctrl_regs[4] & 0x10)
227 				sysctrl_regs[4] |= 0x04000020;
228 			else
229 				sysctrl_regs[4] |= 0x04000000;
230 			if(has_l2cache)
231 				printk(KERN_INFO "Level 2 cache enabled\n");
232 		}
233 	}
234 }
235 
236 static void __init l2cr_init(void)
237 {
238 	/* Checks "l2cr-value" property in the registry */
239 	if (cpu_has_feature(CPU_FTR_L2CR)) {
240 		struct device_node *np;
241 
242 		for_each_of_cpu_node(np) {
243 			const unsigned int *l2cr =
244 				of_get_property(np, "l2cr-value", NULL);
245 			if (l2cr) {
246 				ppc_override_l2cr = 1;
247 				ppc_override_l2cr_value = *l2cr;
248 				_set_L2CR(0);
249 				_set_L2CR(ppc_override_l2cr_value);
250 			}
251 			of_node_put(np);
252 			break;
253 		}
254 	}
255 
256 	if (ppc_override_l2cr)
257 		printk(KERN_INFO "L2CR overridden (0x%x), "
258 		       "backside cache is %s\n",
259 		       ppc_override_l2cr_value,
260 		       (ppc_override_l2cr_value & 0x80000000)
261 				? "enabled" : "disabled");
262 }
263 #endif
264 
265 static void __init pmac_setup_arch(void)
266 {
267 	struct device_node *cpu, *ic;
268 	const int *fp;
269 	unsigned long pvr;
270 
271 	pvr = PVR_VER(mfspr(SPRN_PVR));
272 
273 	/* Set loops_per_jiffy to a half-way reasonable value,
274 	   for use until calibrate_delay gets called. */
275 	loops_per_jiffy = 50000000 / HZ;
276 
277 	for_each_of_cpu_node(cpu) {
278 		fp = of_get_property(cpu, "clock-frequency", NULL);
279 		if (fp != NULL) {
280 			if (pvr >= 0x30 && pvr < 0x80)
281 				/* PPC970 etc. */
282 				loops_per_jiffy = *fp / (3 * HZ);
283 			else if (pvr == 4 || pvr >= 8)
284 				/* 604, G3, G4 etc. */
285 				loops_per_jiffy = *fp / HZ;
286 			else
287 				/* 603, etc. */
288 				loops_per_jiffy = *fp / (2 * HZ);
289 			of_node_put(cpu);
290 			break;
291 		}
292 	}
293 
294 	/* See if newworld or oldworld */
295 	ic = of_find_node_with_property(NULL, "interrupt-controller");
296 	if (ic) {
297 		pmac_newworld = 1;
298 		of_node_put(ic);
299 	}
300 
301 	/* Lookup PCI hosts */
302 	pmac_pci_init();
303 
304 #ifdef CONFIG_PPC32
305 	ohare_init();
306 	l2cr_init();
307 #endif /* CONFIG_PPC32 */
308 
309 	find_via_cuda();
310 	find_via_pmu();
311 	smu_init();
312 
313 #if IS_ENABLED(CONFIG_NVRAM)
314 	pmac_nvram_init();
315 #endif
316 #ifdef CONFIG_PPC32
317 #ifdef CONFIG_BLK_DEV_INITRD
318 	if (initrd_start)
319 		ROOT_DEV = Root_RAM0;
320 	else
321 #endif
322 		ROOT_DEV = DEFAULT_ROOT_DEVICE;
323 #endif
324 
325 #ifdef CONFIG_ADB
326 	if (strstr(boot_command_line, "adb_sync")) {
327 		extern int __adb_probe_sync;
328 		__adb_probe_sync = 1;
329 	}
330 #endif /* CONFIG_ADB */
331 }
332 
333 #ifdef CONFIG_SCSI
334 void note_scsi_host(struct device_node *node, void *host)
335 {
336 }
337 EXPORT_SYMBOL(note_scsi_host);
338 #endif
339 
340 static int initializing = 1;
341 
342 static int pmac_late_init(void)
343 {
344 	initializing = 0;
345 	return 0;
346 }
347 machine_late_initcall(powermac, pmac_late_init);
348 
349 void note_bootable_part(dev_t dev, int part, int goodness);
350 /*
351  * This is __ref because we check for "initializing" before
352  * touching any of the __init sensitive things and "initializing"
353  * will be false after __init time. This can't be __init because it
354  * can be called whenever a disk is first accessed.
355  */
356 void __ref note_bootable_part(dev_t dev, int part, int goodness)
357 {
358 	char *p;
359 
360 	if (!initializing)
361 		return;
362 	if ((goodness <= current_root_goodness) &&
363 	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
364 		return;
365 	p = strstr(boot_command_line, "root=");
366 	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
367 		return;
368 
369 	ROOT_DEV = dev + part;
370 	current_root_goodness = goodness;
371 }
372 
373 #ifdef CONFIG_ADB_CUDA
374 static void __noreturn cuda_restart(void)
375 {
376 	struct adb_request req;
377 
378 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
379 	for (;;)
380 		cuda_poll();
381 }
382 
383 static void __noreturn cuda_shutdown(void)
384 {
385 	struct adb_request req;
386 
387 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
388 	for (;;)
389 		cuda_poll();
390 }
391 
392 #else
393 #define cuda_restart()
394 #define cuda_shutdown()
395 #endif
396 
397 #ifndef CONFIG_ADB_PMU
398 #define pmu_restart()
399 #define pmu_shutdown()
400 #endif
401 
402 #ifndef CONFIG_PMAC_SMU
403 #define smu_restart()
404 #define smu_shutdown()
405 #endif
406 
407 static void __noreturn pmac_restart(char *cmd)
408 {
409 	switch (sys_ctrler) {
410 	case SYS_CTRLER_CUDA:
411 		cuda_restart();
412 		break;
413 	case SYS_CTRLER_PMU:
414 		pmu_restart();
415 		break;
416 	case SYS_CTRLER_SMU:
417 		smu_restart();
418 		break;
419 	default: ;
420 	}
421 	while (1) ;
422 }
423 
424 static void __noreturn pmac_power_off(void)
425 {
426 	switch (sys_ctrler) {
427 	case SYS_CTRLER_CUDA:
428 		cuda_shutdown();
429 		break;
430 	case SYS_CTRLER_PMU:
431 		pmu_shutdown();
432 		break;
433 	case SYS_CTRLER_SMU:
434 		smu_shutdown();
435 		break;
436 	default: ;
437 	}
438 	while (1) ;
439 }
440 
441 static void __noreturn
442 pmac_halt(void)
443 {
444 	pmac_power_off();
445 }
446 
447 /*
448  * Early initialization.
449  */
450 static void __init pmac_init(void)
451 {
452 	/* Enable early btext debug if requested */
453 	if (strstr(boot_command_line, "btextdbg")) {
454 		udbg_adb_init_early();
455 		register_early_udbg_console();
456 	}
457 
458 	/* Probe motherboard chipset */
459 	pmac_feature_init();
460 
461 	/* Initialize debug stuff */
462 	udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
463 	udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
464 
465 #ifdef CONFIG_PPC64
466 	iommu_init_early_dart(&pmac_pci_controller_ops);
467 #endif
468 
469 	/* SMP Init has to be done early as we need to patch up
470 	 * cpu_possible_mask before interrupt stacks are allocated
471 	 * or kaboom...
472 	 */
473 #ifdef CONFIG_SMP
474 	pmac_setup_smp();
475 #endif
476 }
477 
478 static int __init pmac_declare_of_platform_devices(void)
479 {
480 	struct device_node *np;
481 
482 	np = of_find_node_by_name(NULL, "valkyrie");
483 	if (np) {
484 		of_platform_device_create(np, "valkyrie", NULL);
485 		of_node_put(np);
486 	}
487 	np = of_find_node_by_name(NULL, "platinum");
488 	if (np) {
489 		of_platform_device_create(np, "platinum", NULL);
490 		of_node_put(np);
491 	}
492         np = of_find_node_by_type(NULL, "smu");
493         if (np) {
494 		of_platform_device_create(np, "smu", NULL);
495 		of_node_put(np);
496 	}
497 	np = of_find_node_by_type(NULL, "fcu");
498 	if (np == NULL) {
499 		/* Some machines have strangely broken device-tree */
500 		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
501 	}
502 	if (np) {
503 		of_platform_device_create(np, "temperature", NULL);
504 		of_node_put(np);
505 	}
506 
507 	return 0;
508 }
509 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
510 
511 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
512 /*
513  * This is called very early, as part of console_init() (typically just after
514  * time_init()). This function is respondible for trying to find a good
515  * default console on serial ports. It tries to match the open firmware
516  * default output with one of the available serial console drivers.
517  */
518 static int __init check_pmac_serial_console(void)
519 {
520 	struct device_node *prom_stdout = NULL;
521 	int offset = 0;
522 	const char *name;
523 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
524 	char *devname = "ttyS";
525 #else
526 	char *devname = "ttyPZ";
527 #endif
528 
529 	pr_debug(" -> check_pmac_serial_console()\n");
530 
531 	/* The user has requested a console so this is already set up. */
532 	if (strstr(boot_command_line, "console=")) {
533 		pr_debug(" console was specified !\n");
534 		return -EBUSY;
535 	}
536 
537 	if (!of_chosen) {
538 		pr_debug(" of_chosen is NULL !\n");
539 		return -ENODEV;
540 	}
541 
542 	/* We are getting a weird phandle from OF ... */
543 	/* ... So use the full path instead */
544 	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
545 	if (name == NULL) {
546 		pr_debug(" no linux,stdout-path !\n");
547 		return -ENODEV;
548 	}
549 	prom_stdout = of_find_node_by_path(name);
550 	if (!prom_stdout) {
551 		pr_debug(" can't find stdout package %s !\n", name);
552 		return -ENODEV;
553 	}
554 	pr_debug("stdout is %pOF\n", prom_stdout);
555 
556 	if (of_node_name_eq(prom_stdout, "ch-a"))
557 		offset = 0;
558 	else if (of_node_name_eq(prom_stdout, "ch-b"))
559 		offset = 1;
560 	else
561 		goto not_found;
562 	of_node_put(prom_stdout);
563 
564 	pr_debug("Found serial console at %s%d\n", devname, offset);
565 
566 	return add_preferred_console(devname, offset, NULL);
567 
568  not_found:
569 	pr_debug("No preferred console found !\n");
570 	of_node_put(prom_stdout);
571 	return -ENODEV;
572 }
573 console_initcall(check_pmac_serial_console);
574 
575 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
576 
577 /*
578  * Called very early, MMU is off, device-tree isn't unflattened
579  */
580 static int __init pmac_probe(void)
581 {
582 	if (!of_machine_is_compatible("Power Macintosh") &&
583 	    !of_machine_is_compatible("MacRISC"))
584 		return 0;
585 
586 #ifdef CONFIG_PPC32
587 	/* isa_io_base gets set in pmac_pci_init */
588 	DMA_MODE_READ = 1;
589 	DMA_MODE_WRITE = 2;
590 #endif /* CONFIG_PPC32 */
591 
592 	pm_power_off = pmac_power_off;
593 
594 	pmac_init();
595 
596 	return 1;
597 }
598 
599 define_machine(powermac) {
600 	.name			= "PowerMac",
601 	.probe			= pmac_probe,
602 	.setup_arch		= pmac_setup_arch,
603 	.show_cpuinfo		= pmac_show_cpuinfo,
604 	.init_IRQ		= pmac_pic_init,
605 	.get_irq		= NULL,	/* changed later */
606 	.pci_irq_fixup		= pmac_pci_irq_fixup,
607 	.restart		= pmac_restart,
608 	.halt			= pmac_halt,
609 	.time_init		= pmac_time_init,
610 	.get_boot_time		= pmac_get_boot_time,
611 	.set_rtc_time		= pmac_set_rtc_time,
612 	.get_rtc_time		= pmac_get_rtc_time,
613 	.calibrate_decr		= pmac_calibrate_decr,
614 	.feature_call		= pmac_do_feature_call,
615 	.progress		= udbg_progress,
616 #ifdef CONFIG_PPC64
617 	.power_save		= power4_idle,
618 	.enable_pmcs		= power4_enable_pmcs,
619 #endif /* CONFIG_PPC64 */
620 #ifdef CONFIG_PPC32
621 	.pcibios_after_init	= pmac_pcibios_after_init,
622 	.phys_mem_access_prot	= pci_phys_mem_access_prot,
623 #endif
624 };
625