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.h>
49#include <linux/of_platform.h>
50
51#include <asm/reg.h>
52#include <asm/sections.h>
53#include <asm/io.h>
54#include <asm/pci-bridge.h>
55#include <asm/ohare.h>
56#include <asm/mediabay.h>
57#include <asm/machdep.h>
58#include <asm/dma.h>
59#include <asm/cputable.h>
60#include <asm/btext.h>
61#include <asm/pmac_feature.h>
62#include <asm/time.h>
63#include <asm/mmu_context.h>
64#include <asm/iommu.h>
65#include <asm/smu.h>
66#include <asm/pmc.h>
67#include <asm/udbg.h>
68
69#include "pmac.h"
70
71#undef SHOW_GATWICK_IRQS
72
73static int has_l2cache;
74
75int pmac_newworld;
76
77static int current_root_goodness = -1;
78
79/* sda1 - slightly silly choice */
80#define DEFAULT_ROOT_DEVICE	MKDEV(SCSI_DISK0_MAJOR, 1)
81
82sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
83EXPORT_SYMBOL(sys_ctrler);
84
85static void pmac_show_cpuinfo(struct seq_file *m)
86{
87	struct device_node *np;
88	const char *pp;
89	int plen;
90	int mbmodel;
91	unsigned int mbflags;
92	char* mbname;
93
94	mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
95				    PMAC_MB_INFO_MODEL, 0);
96	mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
97				    PMAC_MB_INFO_FLAGS, 0);
98	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
99			      (long) &mbname) != 0)
100		mbname = "Unknown";
101
102	/* find motherboard type */
103	seq_printf(m, "machine\t\t: ");
104	np = of_find_node_by_path("/");
105	if (np != NULL) {
106		pp = of_get_property(np, "model", NULL);
107		if (pp != NULL)
108			seq_printf(m, "%s\n", pp);
109		else
110			seq_printf(m, "PowerMac\n");
111		pp = of_get_property(np, "compatible", &plen);
112		if (pp != NULL) {
113			seq_printf(m, "motherboard\t:");
114			while (plen > 0) {
115				int l = strlen(pp) + 1;
116				seq_printf(m, " %s", pp);
117				plen -= l;
118				pp += l;
119			}
120			seq_printf(m, "\n");
121		}
122		of_node_put(np);
123	} else
124		seq_printf(m, "PowerMac\n");
125
126	/* print parsed model */
127	seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
128	seq_printf(m, "pmac flags\t: %08x\n", mbflags);
129
130	/* find l2 cache info */
131	np = of_find_node_by_name(NULL, "l2-cache");
132	if (np == NULL)
133		np = of_find_node_by_type(NULL, "cache");
134	if (np != NULL) {
135		const unsigned int *ic =
136			of_get_property(np, "i-cache-size", NULL);
137		const unsigned int *dc =
138			of_get_property(np, "d-cache-size", NULL);
139		seq_printf(m, "L2 cache\t:");
140		has_l2cache = 1;
141		if (of_property_read_bool(np, "cache-unified") && dc) {
142			seq_printf(m, " %dK unified", *dc / 1024);
143		} else {
144			if (ic)
145				seq_printf(m, " %dK instruction", *ic / 1024);
146			if (dc)
147				seq_printf(m, "%s %dK data",
148					   (ic? " +": ""), *dc / 1024);
149		}
150		pp = of_get_property(np, "ram-type", NULL);
151		if (pp)
152			seq_printf(m, " %s", pp);
153		seq_printf(m, "\n");
154		of_node_put(np);
155	}
156
157	/* Indicate newworld/oldworld */
158	seq_printf(m, "pmac-generation\t: %s\n",
159		   pmac_newworld ? "NewWorld" : "OldWorld");
160}
161
162#ifndef CONFIG_ADB_CUDA
163int __init find_via_cuda(void)
164{
165	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
166
167	if (!dn)
168		return 0;
169	of_node_put(dn);
170	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
171	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
172	return 0;
173}
174#endif
175
176#ifndef CONFIG_ADB_PMU
177int __init find_via_pmu(void)
178{
179	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
180
181	if (!dn)
182		return 0;
183	of_node_put(dn);
184	printk("WARNING ! Your machine is PMU-based but your kernel\n");
185	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
186	return 0;
187}
188#endif
189
190#ifndef CONFIG_PMAC_SMU
191int __init smu_init(void)
192{
193	/* should check and warn if SMU is present */
194	return 0;
195}
196#endif
197
198#ifdef CONFIG_PPC32
199static volatile u32 *sysctrl_regs;
200
201static void __init ohare_init(void)
202{
203	struct device_node *dn;
204
205	/* this area has the CPU identification register
206	   and some registers used by smp boards */
207	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
208
209	/*
210	 * Turn on the L2 cache.
211	 * We assume that we have a PSX memory controller iff
212	 * we have an ohare I/O controller.
213	 */
214	dn = of_find_node_by_name(NULL, "ohare");
215	if (dn) {
216		of_node_put(dn);
217		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
218			if (sysctrl_regs[4] & 0x10)
219				sysctrl_regs[4] |= 0x04000020;
220			else
221				sysctrl_regs[4] |= 0x04000000;
222			if(has_l2cache)
223				printk(KERN_INFO "Level 2 cache enabled\n");
224		}
225	}
226}
227
228static void __init l2cr_init(void)
229{
230	/* Checks "l2cr-value" property in the registry */
231	if (cpu_has_feature(CPU_FTR_L2CR)) {
232		struct device_node *np;
233
234		for_each_of_cpu_node(np) {
235			const unsigned int *l2cr =
236				of_get_property(np, "l2cr-value", NULL);
237			if (l2cr) {
238				_set_L2CR(0);
239				_set_L2CR(*l2cr);
240				pr_info("L2CR overridden (0x%x), backside cache is %s\n",
241					*l2cr, ((*l2cr) & 0x80000000) ?
242					"enabled" : "disabled");
243			}
244			of_node_put(np);
245			break;
246		}
247	}
248}
249#endif
250
251static 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
316static int initializing = 1;
317
318static int pmac_late_init(void)
319{
320	initializing = 0;
321	return 0;
322}
323machine_late_initcall(powermac, pmac_late_init);
324
325void 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 */
332void __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
350static 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
359static 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
383static 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
400static 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
417static void __noreturn
418pmac_halt(void)
419{
420	pmac_power_off();
421}
422
423/*
424 * Early initialization.
425 */
426static 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
454static 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}
485machine_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 */
494static 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}
549console_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 */
556static 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
575define_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