xref: /linux/arch/powerpc/platforms/powermac/setup.c (revision e78f70bad29c5ae1e1076698b690b15794e9b81e) ! 
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/string_choices.h>
49 #include <linux/of.h>
50 #include <linux/of_platform.h>
51 
52 #include <asm/reg.h>
53 #include <asm/sections.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 static int has_l2cache;
75 
76 int pmac_newworld;
77 
78 static int current_root_goodness = -1;
79 
80 /* sda1 - slightly silly choice */
81 #define DEFAULT_ROOT_DEVICE	MKDEV(SCSI_DISK0_MAJOR, 1)
82 
83 sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
84 EXPORT_SYMBOL(sys_ctrler);
85 
86 static void pmac_show_cpuinfo(struct seq_file *m)
87 {
88 	struct device_node *np;
89 	const char *pp;
90 	int plen;
91 	int mbmodel;
92 	unsigned int mbflags;
93 	char* mbname;
94 
95 	mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
96 				    PMAC_MB_INFO_MODEL, 0);
97 	mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
98 				    PMAC_MB_INFO_FLAGS, 0);
99 	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
100 			      (long) &mbname) != 0)
101 		mbname = "Unknown";
102 
103 	/* find motherboard type */
104 	seq_printf(m, "machine\t\t: ");
105 	np = of_find_node_by_path("/");
106 	if (np != NULL) {
107 		pp = of_get_property(np, "model", NULL);
108 		if (pp != NULL)
109 			seq_printf(m, "%s\n", pp);
110 		else
111 			seq_printf(m, "PowerMac\n");
112 		pp = of_get_property(np, "compatible", &plen);
113 		if (pp != NULL) {
114 			seq_printf(m, "motherboard\t:");
115 			while (plen > 0) {
116 				int l = strlen(pp) + 1;
117 				seq_printf(m, " %s", pp);
118 				plen -= l;
119 				pp += l;
120 			}
121 			seq_printf(m, "\n");
122 		}
123 		of_node_put(np);
124 	} else
125 		seq_printf(m, "PowerMac\n");
126 
127 	/* print parsed model */
128 	seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
129 	seq_printf(m, "pmac flags\t: %08x\n", mbflags);
130 
131 	/* find l2 cache info */
132 	np = of_find_node_by_name(NULL, "l2-cache");
133 	if (np == NULL)
134 		np = of_find_node_by_type(NULL, "cache");
135 	if (np != NULL) {
136 		const unsigned int *ic =
137 			of_get_property(np, "i-cache-size", NULL);
138 		const unsigned int *dc =
139 			of_get_property(np, "d-cache-size", NULL);
140 		seq_printf(m, "L2 cache\t:");
141 		has_l2cache = 1;
142 		if (of_property_read_bool(np, "cache-unified") && dc) {
143 			seq_printf(m, " %dK unified", *dc / 1024);
144 		} else {
145 			if (ic)
146 				seq_printf(m, " %dK instruction", *ic / 1024);
147 			if (dc)
148 				seq_printf(m, "%s %dK data",
149 					   (ic? " +": ""), *dc / 1024);
150 		}
151 		pp = of_get_property(np, "ram-type", NULL);
152 		if (pp)
153 			seq_printf(m, " %s", pp);
154 		seq_printf(m, "\n");
155 		of_node_put(np);
156 	}
157 
158 	/* Indicate newworld/oldworld */
159 	seq_printf(m, "pmac-generation\t: %s\n",
160 		   pmac_newworld ? "NewWorld" : "OldWorld");
161 }
162 
163 #ifndef CONFIG_ADB_CUDA
164 int __init find_via_cuda(void)
165 {
166 	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
167 
168 	if (!dn)
169 		return 0;
170 	of_node_put(dn);
171 	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
172 	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
173 	return 0;
174 }
175 #endif
176 
177 #ifndef CONFIG_ADB_PMU
178 int __init find_via_pmu(void)
179 {
180 	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
181 
182 	if (!dn)
183 		return 0;
184 	of_node_put(dn);
185 	printk("WARNING ! Your machine is PMU-based but your kernel\n");
186 	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
187 	return 0;
188 }
189 #endif
190 
191 #ifndef CONFIG_PMAC_SMU
192 int __init smu_init(void)
193 {
194 	/* should check and warn if SMU is present */
195 	return 0;
196 }
197 #endif
198 
199 #ifdef CONFIG_PPC32
200 static volatile u32 *sysctrl_regs;
201 
202 static void __init ohare_init(void)
203 {
204 	struct device_node *dn;
205 
206 	/* this area has the CPU identification register
207 	   and some registers used by smp boards */
208 	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
209 
210 	/*
211 	 * Turn on the L2 cache.
212 	 * We assume that we have a PSX memory controller iff
213 	 * we have an ohare I/O controller.
214 	 */
215 	dn = of_find_node_by_name(NULL, "ohare");
216 	if (dn) {
217 		of_node_put(dn);
218 		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
219 			if (sysctrl_regs[4] & 0x10)
220 				sysctrl_regs[4] |= 0x04000020;
221 			else
222 				sysctrl_regs[4] |= 0x04000000;
223 			if(has_l2cache)
224 				printk(KERN_INFO "Level 2 cache enabled\n");
225 		}
226 	}
227 }
228 
229 static void __init l2cr_init(void)
230 {
231 	/* Checks "l2cr-value" property in the registry */
232 	if (cpu_has_feature(CPU_FTR_L2CR)) {
233 		struct device_node *np;
234 
235 		for_each_of_cpu_node(np) {
236 			const unsigned int *l2cr =
237 				of_get_property(np, "l2cr-value", NULL);
238 			if (l2cr) {
239 				_set_L2CR(0);
240 				_set_L2CR(*l2cr);
241 				pr_info("L2CR overridden (0x%x), backside cache is %s\n",
242 					*l2cr, str_enabled_disabled((*l2cr) & 0x80000000));
243 			}
244 			of_node_put(np);
245 			break;
246 		}
247 	}
248 }
249 #endif
250 
251 static void __init pmac_setup_arch(void)
252 {
253 	struct device_node *cpu, *ic;
254 	const int *fp;
255 	unsigned long pvr;
256 
257 	pvr = PVR_VER(mfspr(SPRN_PVR));
258 
259 	/* Set loops_per_jiffy to a half-way reasonable value,
260 	   for use until calibrate_delay gets called. */
261 	loops_per_jiffy = 50000000 / HZ;
262 
263 	for_each_of_cpu_node(cpu) {
264 		fp = of_get_property(cpu, "clock-frequency", NULL);
265 		if (fp != NULL) {
266 			if (pvr >= 0x30 && pvr < 0x80)
267 				/* PPC970 etc. */
268 				loops_per_jiffy = *fp / (3 * HZ);
269 			else if (pvr == 4 || pvr >= 8)
270 				/* 604, G3, G4 etc. */
271 				loops_per_jiffy = *fp / HZ;
272 			else
273 				/* 603, etc. */
274 				loops_per_jiffy = *fp / (2 * HZ);
275 			of_node_put(cpu);
276 			break;
277 		}
278 	}
279 
280 	/* See if newworld or oldworld */
281 	ic = of_find_node_with_property(NULL, "interrupt-controller");
282 	if (ic) {
283 		pmac_newworld = 1;
284 		of_node_put(ic);
285 	}
286 
287 #ifdef CONFIG_PPC32
288 	ohare_init();
289 	l2cr_init();
290 #endif /* CONFIG_PPC32 */
291 
292 	find_via_cuda();
293 	find_via_pmu();
294 	smu_init();
295 
296 #if IS_ENABLED(CONFIG_NVRAM)
297 	pmac_nvram_init();
298 #endif
299 #ifdef CONFIG_PPC32
300 #ifdef CONFIG_BLK_DEV_INITRD
301 	if (initrd_start)
302 		ROOT_DEV = Root_RAM0;
303 	else
304 #endif
305 		ROOT_DEV = DEFAULT_ROOT_DEVICE;
306 #endif
307 
308 #ifdef CONFIG_ADB
309 	if (strstr(boot_command_line, "adb_sync")) {
310 		extern int __adb_probe_sync;
311 		__adb_probe_sync = 1;
312 	}
313 #endif /* CONFIG_ADB */
314 }
315 
316 static int initializing = 1;
317 
318 static int pmac_late_init(void)
319 {
320 	initializing = 0;
321 	return 0;
322 }
323 machine_late_initcall(powermac, pmac_late_init);
324 
325 void note_bootable_part(dev_t dev, int part, int goodness);
326 /*
327  * This is __ref because we check for "initializing" before
328  * touching any of the __init sensitive things and "initializing"
329  * will be false after __init time. This can't be __init because it
330  * can be called whenever a disk is first accessed.
331  */
332 void __ref note_bootable_part(dev_t dev, int part, int goodness)
333 {
334 	char *p;
335 
336 	if (!initializing)
337 		return;
338 	if ((goodness <= current_root_goodness) &&
339 	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
340 		return;
341 	p = strstr(boot_command_line, "root=");
342 	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
343 		return;
344 
345 	ROOT_DEV = dev + part;
346 	current_root_goodness = goodness;
347 }
348 
349 #ifdef CONFIG_ADB_CUDA
350 static void __noreturn cuda_restart(void)
351 {
352 	struct adb_request req;
353 
354 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
355 	for (;;)
356 		cuda_poll();
357 }
358 
359 static void __noreturn cuda_shutdown(void)
360 {
361 	struct adb_request req;
362 
363 	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
364 	for (;;)
365 		cuda_poll();
366 }
367 
368 #else
369 #define cuda_restart()
370 #define cuda_shutdown()
371 #endif
372 
373 #ifndef CONFIG_ADB_PMU
374 #define pmu_restart()
375 #define pmu_shutdown()
376 #endif
377 
378 #ifndef CONFIG_PMAC_SMU
379 #define smu_restart()
380 #define smu_shutdown()
381 #endif
382 
383 static void __noreturn pmac_restart(char *cmd)
384 {
385 	switch (sys_ctrler) {
386 	case SYS_CTRLER_CUDA:
387 		cuda_restart();
388 		break;
389 	case SYS_CTRLER_PMU:
390 		pmu_restart();
391 		break;
392 	case SYS_CTRLER_SMU:
393 		smu_restart();
394 		break;
395 	default: ;
396 	}
397 	while (1) ;
398 }
399 
400 static void __noreturn pmac_power_off(void)
401 {
402 	switch (sys_ctrler) {
403 	case SYS_CTRLER_CUDA:
404 		cuda_shutdown();
405 		break;
406 	case SYS_CTRLER_PMU:
407 		pmu_shutdown();
408 		break;
409 	case SYS_CTRLER_SMU:
410 		smu_shutdown();
411 		break;
412 	default: ;
413 	}
414 	while (1) ;
415 }
416 
417 static void __noreturn
418 pmac_halt(void)
419 {
420 	pmac_power_off();
421 }
422 
423 /*
424  * Early initialization.
425  */
426 static void __init pmac_init(void)
427 {
428 	/* Enable early btext debug if requested */
429 	if (strstr(boot_command_line, "btextdbg")) {
430 		udbg_adb_init_early();
431 		register_early_udbg_console();
432 	}
433 
434 	/* Probe motherboard chipset */
435 	pmac_feature_init();
436 
437 	/* Initialize debug stuff */
438 	udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
439 	udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
440 
441 #ifdef CONFIG_PPC64
442 	iommu_init_early_dart(&pmac_pci_controller_ops);
443 #endif
444 
445 	/* SMP Init has to be done early as we need to patch up
446 	 * cpu_possible_mask before interrupt stacks are allocated
447 	 * or kaboom...
448 	 */
449 #ifdef CONFIG_SMP
450 	pmac_setup_smp();
451 #endif
452 }
453 
454 static int __init pmac_declare_of_platform_devices(void)
455 {
456 	struct device_node *np;
457 
458 	np = of_find_node_by_name(NULL, "valkyrie");
459 	if (np) {
460 		of_platform_device_create(np, "valkyrie", NULL);
461 		of_node_put(np);
462 	}
463 	np = of_find_node_by_name(NULL, "platinum");
464 	if (np) {
465 		of_platform_device_create(np, "platinum", NULL);
466 		of_node_put(np);
467 	}
468         np = of_find_node_by_type(NULL, "smu");
469         if (np) {
470 		of_platform_device_create(np, "smu", NULL);
471 		of_node_put(np);
472 	}
473 	np = of_find_node_by_type(NULL, "fcu");
474 	if (np == NULL) {
475 		/* Some machines have strangely broken device-tree */
476 		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
477 	}
478 	if (np) {
479 		of_platform_device_create(np, "temperature", NULL);
480 		of_node_put(np);
481 	}
482 
483 	return 0;
484 }
485 machine_device_initcall(powermac, pmac_declare_of_platform_devices);
486 
487 #ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
488 /*
489  * This is called very early, as part of console_init() (typically just after
490  * time_init()). This function is respondible for trying to find a good
491  * default console on serial ports. It tries to match the open firmware
492  * default output with one of the available serial console drivers.
493  */
494 static int __init check_pmac_serial_console(void)
495 {
496 	struct device_node *prom_stdout = NULL;
497 	int offset = 0;
498 	const char *name;
499 #ifdef CONFIG_SERIAL_PMACZILOG_TTYS
500 	char *devname = "ttyS";
501 #else
502 	char *devname = "ttyPZ";
503 #endif
504 
505 	pr_debug(" -> check_pmac_serial_console()\n");
506 
507 	/* The user has requested a console so this is already set up. */
508 	if (strstr(boot_command_line, "console=")) {
509 		pr_debug(" console was specified !\n");
510 		return -EBUSY;
511 	}
512 
513 	if (!of_chosen) {
514 		pr_debug(" of_chosen is NULL !\n");
515 		return -ENODEV;
516 	}
517 
518 	/* We are getting a weird phandle from OF ... */
519 	/* ... So use the full path instead */
520 	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
521 	if (name == NULL) {
522 		pr_debug(" no linux,stdout-path !\n");
523 		return -ENODEV;
524 	}
525 	prom_stdout = of_find_node_by_path(name);
526 	if (!prom_stdout) {
527 		pr_debug(" can't find stdout package %s !\n", name);
528 		return -ENODEV;
529 	}
530 	pr_debug("stdout is %pOF\n", prom_stdout);
531 
532 	if (of_node_name_eq(prom_stdout, "ch-a"))
533 		offset = 0;
534 	else if (of_node_name_eq(prom_stdout, "ch-b"))
535 		offset = 1;
536 	else
537 		goto not_found;
538 	of_node_put(prom_stdout);
539 
540 	pr_debug("Found serial console at %s%d\n", devname, offset);
541 
542 	return add_preferred_console(devname, offset, NULL);
543 
544  not_found:
545 	pr_debug("No preferred console found !\n");
546 	of_node_put(prom_stdout);
547 	return -ENODEV;
548 }
549 console_initcall(check_pmac_serial_console);
550 
551 #endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
552 
553 /*
554  * Called very early, MMU is off, device-tree isn't unflattened
555  */
556 static int __init pmac_probe(void)
557 {
558 	if (!of_machine_is_compatible("Power Macintosh") &&
559 	    !of_machine_is_compatible("MacRISC"))
560 		return 0;
561 
562 #ifdef CONFIG_PPC32
563 	/* isa_io_base gets set in pmac_pci_init */
564 	DMA_MODE_READ = 1;
565 	DMA_MODE_WRITE = 2;
566 #endif /* CONFIG_PPC32 */
567 
568 	pm_power_off = pmac_power_off;
569 
570 	pmac_init();
571 
572 	return 1;
573 }
574 
575 define_machine(powermac) {
576 	.name			= "PowerMac",
577 	.probe			= pmac_probe,
578 	.setup_arch		= pmac_setup_arch,
579 	.discover_phbs		= pmac_pci_init,
580 	.show_cpuinfo		= pmac_show_cpuinfo,
581 	.init_IRQ		= pmac_pic_init,
582 	.get_irq		= NULL,	/* changed later */
583 	.pci_irq_fixup		= pmac_pci_irq_fixup,
584 	.restart		= pmac_restart,
585 	.halt			= pmac_halt,
586 	.time_init		= pmac_time_init,
587 	.get_boot_time		= pmac_get_boot_time,
588 	.set_rtc_time		= pmac_set_rtc_time,
589 	.get_rtc_time		= pmac_get_rtc_time,
590 	.calibrate_decr		= pmac_calibrate_decr,
591 	.feature_call		= pmac_do_feature_call,
592 	.progress		= udbg_progress,
593 #ifdef CONFIG_PPC64
594 	.power_save		= power4_idle,
595 	.enable_pmcs		= power4_enable_pmcs,
596 #endif /* CONFIG_PPC64 */
597 #ifdef CONFIG_PPC32
598 	.pcibios_after_init	= pmac_pcibios_after_init,
599 	.phys_mem_access_prot	= pci_phys_mem_access_prot,
600 #endif
601 };
602