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
74int ppc_override_l2cr = 0;
75int ppc_override_l2cr_value;
76int has_l2cache = 0;
77
78int pmac_newworld;
79
80static int current_root_goodness = -1;
81
82extern struct machdep_calls pmac_md;
83
84#define DEFAULT_ROOT_DEVICE Root_SDA1	/* sda1 - slightly silly choice */
85
86#ifdef CONFIG_PPC64
87int sccdbg;
88#endif
89
90sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
91EXPORT_SYMBOL(sys_ctrler);
92
93static 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
171int 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
185int 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
199int smu_init(void)
200{
201	/* should check and warn if SMU is present */
202	return 0;
203}
204#endif
205
206#ifdef CONFIG_PPC32
207static volatile u32 *sysctrl_regs;
208
209static 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
236static 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
265static 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
334void note_scsi_host(struct device_node *node, void *host)
335{
336}
337EXPORT_SYMBOL(note_scsi_host);
338#endif
339
340static int initializing = 1;
341
342static int pmac_late_init(void)
343{
344	initializing = 0;
345	return 0;
346}
347machine_late_initcall(powermac, pmac_late_init);
348
349void 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 */
356void __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
374static 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
383static 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
407static 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
424static 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
441static void __noreturn
442pmac_halt(void)
443{
444	pmac_power_off();
445}
446
447/*
448 * Early initialization.
449 */
450static 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
478static 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}
509machine_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 */
518static 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}
573console_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 */
580static 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
599define_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