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/pgtable.h>
55 #include <asm/io.h>
56 #include <asm/pci-bridge.h>
57 #include <asm/ohare.h>
58 #include <asm/mediabay.h>
59 #include <asm/machdep.h>
60 #include <asm/dma.h>
61 #include <asm/cputable.h>
62 #include <asm/btext.h>
63 #include <asm/pmac_feature.h>
64 #include <asm/time.h>
65 #include <asm/mmu_context.h>
66 #include <asm/iommu.h>
67 #include <asm/smu.h>
68 #include <asm/pmc.h>
69 #include <asm/udbg.h>
70 
71 #include "pmac.h"
72 
73 #undef SHOW_GATWICK_IRQS
74 
75 int ppc_override_l2cr = 0;
76 int ppc_override_l2cr_value;
77 int has_l2cache = 0;
78 
79 int pmac_newworld;
80 
81 static int current_root_goodness = -1;
82 
83 extern struct machdep_calls pmac_md;
84 
85 #define DEFAULT_ROOT_DEVICE Root_SDA1	/* sda1 - slightly silly choice */
86 
87 #ifdef CONFIG_PPC64
88 int sccdbg;
89 #endif
90 
91 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
92 EXPORT_SYMBOL(sys_ctrler);
93 
94 static void pmac_show_cpuinfo(struct seq_file *m)
95 {
96 	struct device_node *np;
97 	const char *pp;
98 	int plen;
99 	int mbmodel;
100 	unsigned int mbflags;
101 	char* mbname;
102 
103 	mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
104 				    PMAC_MB_INFO_MODEL, 0);
105 	mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
106 				    PMAC_MB_INFO_FLAGS, 0);
107 	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
108 			      (long) &mbname) != 0)
109 		mbname = "Unknown";
110 
111 	/* find motherboard type */
112 	seq_printf(m, "machine\t\t: ");
113 	np = of_find_node_by_path("/");
114 	if (np != NULL) {
115 		pp = of_get_property(np, "model", NULL);
116 		if (pp != NULL)
117 			seq_printf(m, "%s\n", pp);
118 		else
119 			seq_printf(m, "PowerMac\n");
120 		pp = of_get_property(np, "compatible", &plen);
121 		if (pp != NULL) {
122 			seq_printf(m, "motherboard\t:");
123 			while (plen > 0) {
124 				int l = strlen(pp) + 1;
125 				seq_printf(m, " %s", pp);
126 				plen -= l;
127 				pp += l;
128 			}
129 			seq_printf(m, "\n");
130 		}
131 		of_node_put(np);
132 	} else
133 		seq_printf(m, "PowerMac\n");
134 
135 	/* print parsed model */
136 	seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
137 	seq_printf(m, "pmac flags\t: %08x\n", mbflags);
138 
139 	/* find l2 cache info */
140 	np = of_find_node_by_name(NULL, "l2-cache");
141 	if (np == NULL)
142 		np = of_find_node_by_type(NULL, "cache");
143 	if (np != NULL) {
144 		const unsigned int *ic =
145 			of_get_property(np, "i-cache-size", NULL);
146 		const unsigned int *dc =
147 			of_get_property(np, "d-cache-size", NULL);
148 		seq_printf(m, "L2 cache\t:");
149 		has_l2cache = 1;
150 		if (of_get_property(np, "cache-unified", NULL) && dc) {
151 			seq_printf(m, " %dK unified", *dc / 1024);
152 		} else {
153 			if (ic)
154 				seq_printf(m, " %dK instruction", *ic / 1024);
155 			if (dc)
156 				seq_printf(m, "%s %dK data",
157 					   (ic? " +": ""), *dc / 1024);
158 		}
159 		pp = of_get_property(np, "ram-type", NULL);
160 		if (pp)
161 			seq_printf(m, " %s", pp);
162 		seq_printf(m, "\n");
163 		of_node_put(np);
164 	}
165 
166 	/* Indicate newworld/oldworld */
167 	seq_printf(m, "pmac-generation\t: %s\n",
168 		   pmac_newworld ? "NewWorld" : "OldWorld");
169 }
170 
171 #ifndef CONFIG_ADB_CUDA
172 int find_via_cuda(void)
173 {
174 	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
175 
176 	if (!dn)
177 		return 0;
178 	of_node_put(dn);
179 	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
180 	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
181 	return 0;
182 }
183 #endif
184 
185 #ifndef CONFIG_ADB_PMU
186 int find_via_pmu(void)
187 {
188 	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
189 
190 	if (!dn)
191 		return 0;
192 	of_node_put(dn);
193 	printk("WARNING ! Your machine is PMU-based but your kernel\n");
194 	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
195 	return 0;
196 }
197 #endif
198 
199 #ifndef CONFIG_PMAC_SMU
200 int smu_init(void)
201 {
202 	/* should check and warn if SMU is present */
203 	return 0;
204 }
205 #endif
206 
207 #ifdef CONFIG_PPC32
208 static volatile u32 *sysctrl_regs;
209 
210 static void __init ohare_init(void)
211 {
212 	struct device_node *dn;
213 
214 	/* this area has the CPU identification register
215 	   and some registers used by smp boards */
216 	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
217 
218 	/*
219 	 * Turn on the L2 cache.
220 	 * We assume that we have a PSX memory controller iff
221 	 * we have an ohare I/O controller.
222 	 */
223 	dn = of_find_node_by_name(NULL, "ohare");
224 	if (dn) {
225 		of_node_put(dn);
226 		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
227 			if (sysctrl_regs[4] & 0x10)
228 				sysctrl_regs[4] |= 0x04000020;
229 			else
230 				sysctrl_regs[4] |= 0x04000000;
231 			if(has_l2cache)
232 				printk(KERN_INFO "Level 2 cache enabled\n");
233 		}
234 	}
235 }
236 
237 static void __init l2cr_init(void)
238 {
239 	/* Checks "l2cr-value" property in the registry */
240 	if (cpu_has_feature(CPU_FTR_L2CR)) {
241 		struct device_node *np;
242 
243 		for_each_of_cpu_node(np) {
244 			const unsigned int *l2cr =
245 				of_get_property(np, "l2cr-value", NULL);
246 			if (l2cr) {
247 				ppc_override_l2cr = 1;
248 				ppc_override_l2cr_value = *l2cr;
249 				_set_L2CR(0);
250 				_set_L2CR(ppc_override_l2cr_value);
251 			}
252 			of_node_put(np);
253 			break;
254 		}
255 	}
256 
257 	if (ppc_override_l2cr)
258 		printk(KERN_INFO "L2CR overridden (0x%x), "
259 		       "backside cache is %s\n",
260 		       ppc_override_l2cr_value,
261 		       (ppc_override_l2cr_value & 0x80000000)
262 				? "enabled" : "disabled");
263 }
264 #endif
265 
266 static void __init pmac_setup_arch(void)
267 {
268 	struct device_node *cpu, *ic;
269 	const int *fp;
270 	unsigned long pvr;
271 
272 	pvr = PVR_VER(mfspr(SPRN_PVR));
273 
274 	/* Set loops_per_jiffy to a half-way reasonable value,
275 	   for use until calibrate_delay gets called. */
276 	loops_per_jiffy = 50000000 / HZ;
277 
278 	for_each_of_cpu_node(cpu) {
279 		fp = of_get_property(cpu, "clock-frequency", NULL);
280 		if (fp != NULL) {
281 			if (pvr >= 0x30 && pvr < 0x80)
282 				/* PPC970 etc. */
283 				loops_per_jiffy = *fp / (3 * HZ);
284 			else if (pvr == 4 || pvr >= 8)
285 				/* 604, G3, G4 etc. */
286 				loops_per_jiffy = *fp / HZ;
287 			else
288 				/* 601, 603, etc. */
289 				loops_per_jiffy = *fp / (2 * HZ);
290 			of_node_put(cpu);
291 			break;
292 		}
293 	}
294 
295 	/* See if newworld or oldworld */
296 	ic = of_find_node_with_property(NULL, "interrupt-controller");
297 	if (ic) {
298 		pmac_newworld = 1;
299 		of_node_put(ic);
300 	}
301 
302 	/* Lookup PCI hosts */
303 	pmac_pci_init();
304 
305 #ifdef CONFIG_PPC32
306 	ohare_init();
307 	l2cr_init();
308 #endif /* CONFIG_PPC32 */
309 
310 	find_via_cuda();
311 	find_via_pmu();
312 	smu_init();
313 
314 #if IS_ENABLED(CONFIG_NVRAM)
315 	pmac_nvram_init();
316 #endif
317 #ifdef CONFIG_PPC32
318 #ifdef CONFIG_BLK_DEV_INITRD
319 	if (initrd_start)
320 		ROOT_DEV = Root_RAM0;
321 	else
322 #endif
323 		ROOT_DEV = DEFAULT_ROOT_DEVICE;
324 #endif
325 
326 #ifdef CONFIG_ADB
327 	if (strstr(boot_command_line, "adb_sync")) {
328 		extern int __adb_probe_sync;
329 		__adb_probe_sync = 1;
330 	}
331 #endif /* CONFIG_ADB */
332 }
333 
334 #ifdef CONFIG_SCSI
335 void note_scsi_host(struct device_node *node, void *host)
336 {
337 }
338 EXPORT_SYMBOL(note_scsi_host);
339 #endif
340 
341 static int initializing = 1;
342 
343 static int pmac_late_init(void)
344 {
345 	initializing = 0;
346 	return 0;
347 }
348 machine_late_initcall(powermac, pmac_late_init);
349 
350 void note_bootable_part(dev_t dev, int part, int goodness);
351 /*
352  * This is __ref because we check for "initializing" before
353  * touching any of the __init sensitive things and "initializing"
354  * will be false after __init time. This can't be __init because it
355  * can be called whenever a disk is first accessed.
356  */
357 void __ref note_bootable_part(dev_t dev, int part, int goodness)
358 {
359 	char *p;
360 
361 	if (!initializing)
362 		return;
363 	if ((goodness <= current_root_goodness) &&
364 	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
365 		return;
366 	p = strstr(boot_command_line, "root=");
367 	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
368 		return;
369 
370 	ROOT_DEV = dev + part;
371 	current_root_goodness = goodness;
372 }
373 
374 #ifdef CONFIG_ADB_CUDA
375 static void __noreturn cuda_restart(void)
376 {
377 	struct adb_request req;
378 
379 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
380 	for (;;)
381 		cuda_poll();
382 }
383 
384 static void __noreturn cuda_shutdown(void)
385 {
386 	struct adb_request req;
387 
388 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
389 	for (;;)
390 		cuda_poll();
391 }
392 
393 #else
394 #define cuda_restart()
395 #define cuda_shutdown()
396 #endif
397 
398 #ifndef CONFIG_ADB_PMU
399 #define pmu_restart()
400 #define pmu_shutdown()
401 #endif
402 
403 #ifndef CONFIG_PMAC_SMU
404 #define smu_restart()
405 #define smu_shutdown()
406 #endif
407 
408 static void __noreturn pmac_restart(char *cmd)
409 {
410 	switch (sys_ctrler) {
411 	case SYS_CTRLER_CUDA:
412 		cuda_restart();
413 		break;
414 	case SYS_CTRLER_PMU:
415 		pmu_restart();
416 		break;
417 	case SYS_CTRLER_SMU:
418 		smu_restart();
419 		break;
420 	default: ;
421 	}
422 	while (1) ;
423 }
424 
425 static void __noreturn pmac_power_off(void)
426 {
427 	switch (sys_ctrler) {
428 	case SYS_CTRLER_CUDA:
429 		cuda_shutdown();
430 		break;
431 	case SYS_CTRLER_PMU:
432 		pmu_shutdown();
433 		break;
434 	case SYS_CTRLER_SMU:
435 		smu_shutdown();
436 		break;
437 	default: ;
438 	}
439 	while (1) ;
440 }
441 
442 static void __noreturn
443 pmac_halt(void)
444 {
445 	pmac_power_off();
446 }
447 
448 /*
449  * Early initialization.
450  */
451 static void __init pmac_init(void)
452 {
453 	/* Enable early btext debug if requested */
454 	if (strstr(boot_command_line, "btextdbg")) {
455 		udbg_adb_init_early();
456 		register_early_udbg_console();
457 	}
458 
459 	/* Probe motherboard chipset */
460 	pmac_feature_init();
461 
462 	/* Initialize debug stuff */
463 	udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
464 	udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
465 
466 #ifdef CONFIG_PPC64
467 	iommu_init_early_dart(&pmac_pci_controller_ops);
468 #endif
469 
470 	/* SMP Init has to be done early as we need to patch up
471 	 * cpu_possible_mask before interrupt stacks are allocated
472 	 * or kaboom...
473 	 */
474 #ifdef CONFIG_SMP
475 	pmac_setup_smp();
476 #endif
477 }
478 
479 static int __init pmac_declare_of_platform_devices(void)
480 {
481 	struct device_node *np;
482 
483 	np = of_find_node_by_name(NULL, "valkyrie");
484 	if (np) {
485 		of_platform_device_create(np, "valkyrie", NULL);
486 		of_node_put(np);
487 	}
488 	np = of_find_node_by_name(NULL, "platinum");
489 	if (np) {
490 		of_platform_device_create(np, "platinum", NULL);
491 		of_node_put(np);
492 	}
493         np = of_find_node_by_type(NULL, "smu");
494         if (np) {
495 		of_platform_device_create(np, "smu", NULL);
496 		of_node_put(np);
497 	}
498 	np = of_find_node_by_type(NULL, "fcu");
499 	if (np == NULL) {
500 		/* Some machines have strangely broken device-tree */
501 		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
502 	}
503 	if (np) {
504 		of_platform_device_create(np, "temperature", NULL);
505 		of_node_put(np);
506 	}
507 
508 	return 0;
509 }
510 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
511 
512 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
513 /*
514  * This is called very early, as part of console_init() (typically just after
515  * time_init()). This function is respondible for trying to find a good
516  * default console on serial ports. It tries to match the open firmware
517  * default output with one of the available serial console drivers.
518  */
519 static int __init check_pmac_serial_console(void)
520 {
521 	struct device_node *prom_stdout = NULL;
522 	int offset = 0;
523 	const char *name;
524 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
525 	char *devname = "ttyS";
526 #else
527 	char *devname = "ttyPZ";
528 #endif
529 
530 	pr_debug(" -> check_pmac_serial_console()\n");
531 
532 	/* The user has requested a console so this is already set up. */
533 	if (strstr(boot_command_line, "console=")) {
534 		pr_debug(" console was specified !\n");
535 		return -EBUSY;
536 	}
537 
538 	if (!of_chosen) {
539 		pr_debug(" of_chosen is NULL !\n");
540 		return -ENODEV;
541 	}
542 
543 	/* We are getting a weird phandle from OF ... */
544 	/* ... So use the full path instead */
545 	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
546 	if (name == NULL) {
547 		pr_debug(" no linux,stdout-path !\n");
548 		return -ENODEV;
549 	}
550 	prom_stdout = of_find_node_by_path(name);
551 	if (!prom_stdout) {
552 		pr_debug(" can't find stdout package %s !\n", name);
553 		return -ENODEV;
554 	}
555 	pr_debug("stdout is %pOF\n", prom_stdout);
556 
557 	if (of_node_name_eq(prom_stdout, "ch-a"))
558 		offset = 0;
559 	else if (of_node_name_eq(prom_stdout, "ch-b"))
560 		offset = 1;
561 	else
562 		goto not_found;
563 	of_node_put(prom_stdout);
564 
565 	pr_debug("Found serial console at %s%d\n", devname, offset);
566 
567 	return add_preferred_console(devname, offset, NULL);
568 
569  not_found:
570 	pr_debug("No preferred console found !\n");
571 	of_node_put(prom_stdout);
572 	return -ENODEV;
573 }
574 console_initcall(check_pmac_serial_console);
575 
576 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
577 
578 /*
579  * Called very early, MMU is off, device-tree isn't unflattened
580  */
581 static int __init pmac_probe(void)
582 {
583 	if (!of_machine_is_compatible("Power Macintosh") &&
584 	    !of_machine_is_compatible("MacRISC"))
585 		return 0;
586 
587 #ifdef CONFIG_PPC32
588 	/* isa_io_base gets set in pmac_pci_init */
589 	DMA_MODE_READ = 1;
590 	DMA_MODE_WRITE = 2;
591 #endif /* CONFIG_PPC32 */
592 
593 	pm_power_off = pmac_power_off;
594 
595 	pmac_init();
596 
597 	return 1;
598 }
599 
600 define_machine(powermac) {
601 	.name			= "PowerMac",
602 	.probe			= pmac_probe,
603 	.setup_arch		= pmac_setup_arch,
604 	.show_cpuinfo		= pmac_show_cpuinfo,
605 	.init_IRQ		= pmac_pic_init,
606 	.get_irq		= NULL,	/* changed later */
607 	.pci_irq_fixup		= pmac_pci_irq_fixup,
608 	.restart		= pmac_restart,
609 	.halt			= pmac_halt,
610 	.time_init		= pmac_time_init,
611 	.get_boot_time		= pmac_get_boot_time,
612 	.set_rtc_time		= pmac_set_rtc_time,
613 	.get_rtc_time		= pmac_get_rtc_time,
614 	.calibrate_decr		= pmac_calibrate_decr,
615 	.feature_call		= pmac_do_feature_call,
616 	.progress		= udbg_progress,
617 #ifdef CONFIG_PPC64
618 	.power_save		= power4_idle,
619 	.enable_pmcs		= power4_enable_pmcs,
620 #endif /* CONFIG_PPC64 */
621 #ifdef CONFIG_PPC32
622 	.pcibios_after_init	= pmac_pcibios_after_init,
623 	.phys_mem_access_prot	= pci_phys_mem_access_prot,
624 #endif
625 };
626