setup.c

  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/string.h>
 32#include <linux/delay.h>
 33#include <linux/ioport.h>
 34#include <linux/major.h>
 35#include <linux/initrd.h>
 36#include <linux/console.h>
 37#include <linux/pci.h>
 38#include <linux/adb.h>
 39#include <linux/cuda.h>
 40#include <linux/pmu.h>
 41#include <linux/irq.h>
 42#include <linux/seq_file.h>
 43#include <linux/root_dev.h>
 44#include <linux/bitops.h>
 45#include <linux/suspend.h>
 46#include <linux/string_choices.h>
 47#include <linux/of.h>
 48#include <linux/of_platform.h>
 49
 50#include <asm/reg.h>
 51#include <asm/sections.h>
 52#include <asm/io.h>
 53#include <asm/pci-bridge.h>
 54#include <asm/ohare.h>
 55#include <asm/mediabay.h>
 56#include <asm/machdep.h>
 57#include <asm/dma.h>
 58#include <asm/cputable.h>
 59#include <asm/btext.h>
 60#include <asm/pmac_feature.h>
 61#include <asm/time.h>
 62#include <asm/mmu_context.h>
 63#include <asm/iommu.h>
 64#include <asm/smu.h>
 65#include <asm/pmc.h>
 66#include <asm/udbg.h>
 67
 68#include "pmac.h"
 69
 70#undef SHOW_GATWICK_IRQS
 71
 72static int has_l2cache;
 73
 74int pmac_newworld;
 75
 76static int current_root_goodness = -1;
 77
 78/* sda1 - slightly silly choice */
 79#define DEFAULT_ROOT_DEVICE	MKDEV(SCSI_DISK0_MAJOR, 1)
 80
 81sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
 82EXPORT_SYMBOL(sys_ctrler);
 83
 84static void pmac_show_cpuinfo(struct seq_file *m)
 85{
 86	struct device_node *np;
 87	const char *pp;
 88	int plen;
 89	int mbmodel;
 90	unsigned int mbflags;
 91	char* mbname;
 92
 93	mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 94				    PMAC_MB_INFO_MODEL, 0);
 95	mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
 96				    PMAC_MB_INFO_FLAGS, 0);
 97	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
 98			      (long) &mbname) != 0)
 99		mbname = "Unknown";
100
101	/* find motherboard type */
102	seq_printf(m, "machine\t\t: ");
103	np = of_find_node_by_path("/");
104	if (np != NULL) {
105		pp = of_get_property(np, "model", NULL);
106		if (pp != NULL)
107			seq_printf(m, "%s\n", pp);
108		else
109			seq_printf(m, "PowerMac\n");
110		pp = of_get_property(np, "compatible", &plen);
111		if (pp != NULL) {
112			seq_printf(m, "motherboard\t:");
113			while (plen > 0) {
114				int l = strlen(pp) + 1;
115				seq_printf(m, " %s", pp);
116				plen -= l;
117				pp += l;
118			}
119			seq_printf(m, "\n");
120		}
121		of_node_put(np);
122	} else
123		seq_printf(m, "PowerMac\n");
124
125	/* print parsed model */
126	seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
127	seq_printf(m, "pmac flags\t: %08x\n", mbflags);
128
129	/* find l2 cache info */
130	np = of_find_node_by_name(NULL, "l2-cache");
131	if (np == NULL)
132		np = of_find_node_by_type(NULL, "cache");
133	if (np != NULL) {
134		const unsigned int *ic =
135			of_get_property(np, "i-cache-size", NULL);
136		const unsigned int *dc =
137			of_get_property(np, "d-cache-size", NULL);
138		seq_printf(m, "L2 cache\t:");
139		has_l2cache = 1;
140		if (of_property_read_bool(np, "cache-unified") && dc) {
141			seq_printf(m, " %dK unified", *dc / 1024);
142		} else {
143			if (ic)
144				seq_printf(m, " %dK instruction", *ic / 1024);
145			if (dc)
146				seq_printf(m, "%s %dK data",
147					   (ic? " +": ""), *dc / 1024);
148		}
149		pp = of_get_property(np, "ram-type", NULL);
150		if (pp)
151			seq_printf(m, " %s", pp);
152		seq_printf(m, "\n");
153		of_node_put(np);
154	}
155
156	/* Indicate newworld/oldworld */
157	seq_printf(m, "pmac-generation\t: %s\n",
158		   pmac_newworld ? "NewWorld" : "OldWorld");
159}
160
161#ifndef CONFIG_ADB_CUDA
162int __init find_via_cuda(void)
163{
164	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
165
166	if (!dn)
167		return 0;
168	of_node_put(dn);
169	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
170	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
171	return 0;
172}
173#endif
174
175#ifndef CONFIG_ADB_PMU
176int __init find_via_pmu(void)
177{
178	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
179
180	if (!dn)
181		return 0;
182	of_node_put(dn);
183	printk("WARNING ! Your machine is PMU-based but your kernel\n");
184	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
185	return 0;
186}
187#endif
188
189#ifndef CONFIG_PMAC_SMU
190int __init smu_init(void)
191{
192	/* should check and warn if SMU is present */
193	return 0;
194}
195#endif
196
197#ifdef CONFIG_PPC32
198static volatile u32 *sysctrl_regs;
199
200static void __init ohare_init(void)
201{
202	struct device_node *dn;
203
204	/* this area has the CPU identification register
205	   and some registers used by smp boards */
206	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
207
208	/*
209	 * Turn on the L2 cache.
210	 * We assume that we have a PSX memory controller iff
211	 * we have an ohare I/O controller.
212	 */
213	dn = of_find_node_by_name(NULL, "ohare");
214	if (dn) {
215		of_node_put(dn);
216		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
217			if (sysctrl_regs[4] & 0x10)
218				sysctrl_regs[4] |= 0x04000020;
219			else
220				sysctrl_regs[4] |= 0x04000000;
221			if(has_l2cache)
222				printk(KERN_INFO "Level 2 cache enabled\n");
223		}
224	}
225}
226
227static void __init l2cr_init(void)
228{
229	/* Checks "l2cr-value" property in the registry */
230	if (cpu_has_feature(CPU_FTR_L2CR)) {
231		struct device_node *np;
232
233		for_each_of_cpu_node(np) {
234			const unsigned int *l2cr =
235				of_get_property(np, "l2cr-value", NULL);
236			if (l2cr) {
237				_set_L2CR(0);
238				_set_L2CR(*l2cr);
239				pr_info("L2CR overridden (0x%x), backside cache is %s\n",
240					*l2cr, str_enabled_disabled((*l2cr) & 0x80000000));
241			}
242			of_node_put(np);
243			break;
244		}
245	}
246}
247#endif
248
249static void __init pmac_setup_arch(void)
250{
251	struct device_node *cpu, *ic;
252	const int *fp;
253	unsigned long pvr;
254
255	pvr = PVR_VER(mfspr(SPRN_PVR));
256
257	/* Set loops_per_jiffy to a half-way reasonable value,
258	   for use until calibrate_delay gets called. */
259	loops_per_jiffy = 50000000 / HZ;
260
261	for_each_of_cpu_node(cpu) {
262		fp = of_get_property(cpu, "clock-frequency", NULL);
263		if (fp != NULL) {
264			if (pvr >= 0x30 && pvr < 0x80)
265				/* PPC970 etc. */
266				loops_per_jiffy = *fp / (3 * HZ);
267			else if (pvr == 4 || pvr >= 8)
268				/* 604, G3, G4 etc. */
269				loops_per_jiffy = *fp / HZ;
270			else
271				/* 603, etc. */
272				loops_per_jiffy = *fp / (2 * HZ);
273			of_node_put(cpu);
274			break;
275		}
276	}
277
278	/* See if newworld or oldworld */
279	ic = of_find_node_with_property(NULL, "interrupt-controller");
280	if (ic) {
281		pmac_newworld = 1;
282		of_node_put(ic);
283	}
284
285#ifdef CONFIG_PPC32
286	ohare_init();
287	l2cr_init();
288#endif /* CONFIG_PPC32 */
289
290	find_via_cuda();
291	find_via_pmu();
292	smu_init();
293
294#if IS_ENABLED(CONFIG_NVRAM)
295	pmac_nvram_init();
296#endif
297#ifdef CONFIG_PPC32
298#ifdef CONFIG_BLK_DEV_INITRD
299	if (initrd_start)
300		ROOT_DEV = Root_RAM0;
301	else
302#endif
303		ROOT_DEV = DEFAULT_ROOT_DEVICE;
304#endif
305
306#ifdef CONFIG_ADB
307	if (strstr(boot_command_line, "adb_sync")) {
308		extern int __adb_probe_sync;
309		__adb_probe_sync = 1;
310	}
311#endif /* CONFIG_ADB */
312}
313
314static int initializing = 1;
315
316static int pmac_late_init(void)
317{
318	initializing = 0;
319	return 0;
320}
321machine_late_initcall(powermac, pmac_late_init);
322
323void note_bootable_part(dev_t dev, int part, int goodness);
324/*
325 * This is __ref because we check for "initializing" before
326 * touching any of the __init sensitive things and "initializing"
327 * will be false after __init time. This can't be __init because it
328 * can be called whenever a disk is first accessed.
329 */
330void __ref note_bootable_part(dev_t dev, int part, int goodness)
331{
332	char *p;
333
334	if (!initializing)
335		return;
336	if ((goodness <= current_root_goodness) &&
337	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
338		return;
339	p = strstr(boot_command_line, "root=");
340	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
341		return;
342
343	ROOT_DEV = dev + part;
344	current_root_goodness = goodness;
345}
346
347#ifdef CONFIG_ADB_CUDA
348static void __noreturn cuda_restart(void)
349{
350	struct adb_request req;
351
352	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
353	for (;;)
354		cuda_poll();
355}
356
357static void __noreturn cuda_shutdown(void)
358{
359	struct adb_request req;
360
361	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
362	for (;;)
363		cuda_poll();
364}
365
366#else
367#define cuda_restart()
368#define cuda_shutdown()
369#endif
370
371#ifndef CONFIG_ADB_PMU
372#define pmu_restart()
373#define pmu_shutdown()
374#endif
375
376#ifndef CONFIG_PMAC_SMU
377#define smu_restart()
378#define smu_shutdown()
379#endif
380
381static void __noreturn pmac_restart(char *cmd)
382{
383	switch (sys_ctrler) {
384	case SYS_CTRLER_CUDA:
385		cuda_restart();
386		break;
387	case SYS_CTRLER_PMU:
388		pmu_restart();
389		break;
390	case SYS_CTRLER_SMU:
391		smu_restart();
392		break;
393	default: ;
394	}
395	while (1) ;
396}
397
398static void __noreturn pmac_power_off(void)
399{
400	switch (sys_ctrler) {
401	case SYS_CTRLER_CUDA:
402		cuda_shutdown();
403		break;
404	case SYS_CTRLER_PMU:
405		pmu_shutdown();
406		break;
407	case SYS_CTRLER_SMU:
408		smu_shutdown();
409		break;
410	default: ;
411	}
412	while (1) ;
413}
414
415static void __noreturn
416pmac_halt(void)
417{
418	pmac_power_off();
419}
420
421/* 
422 * Early initialization.
423 */
424static void __init pmac_init(void)
425{
426	/* Enable early btext debug if requested */
427	if (strstr(boot_command_line, "btextdbg")) {
428		udbg_adb_init_early();
429		register_early_udbg_console();
430	}
431
432	/* Probe motherboard chipset */
433	pmac_feature_init();
434
435	/* Initialize debug stuff */
436	udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
437	udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
438
439#ifdef CONFIG_PPC64
440	iommu_init_early_dart(&pmac_pci_controller_ops);
441#endif
442
443	/* SMP Init has to be done early as we need to patch up
444	 * cpu_possible_mask before interrupt stacks are allocated
445	 * or kaboom...
446	 */
447#ifdef CONFIG_SMP
448	pmac_setup_smp();
449#endif
450}
451
452static int __init pmac_declare_of_platform_devices(void)
453{
454	struct device_node *np;
455
456	np = of_find_node_by_name(NULL, "valkyrie");
457	if (np) {
458		of_platform_device_create(np, "valkyrie", NULL);
459		of_node_put(np);
460	}
461	np = of_find_node_by_name(NULL, "platinum");
462	if (np) {
463		of_platform_device_create(np, "platinum", NULL);
464		of_node_put(np);
465	}
466        np = of_find_node_by_type(NULL, "smu");
467        if (np) {
468		of_platform_device_create(np, "smu", NULL);
469		of_node_put(np);
470	}
471	np = of_find_node_by_type(NULL, "fcu");
472	if (np == NULL) {
473		/* Some machines have strangely broken device-tree */
474		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
475	}
476	if (np) {
477		of_platform_device_create(np, "temperature", NULL);
478		of_node_put(np);
479	}
480
481	return 0;
482}
483machine_device_initcall(powermac, pmac_declare_of_platform_devices);
484
485#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
486/*
487 * This is called very early, as part of console_init() (typically just after
488 * time_init()). This function is respondible for trying to find a good
489 * default console on serial ports. It tries to match the open firmware
490 * default output with one of the available serial console drivers.
491 */
492static int __init check_pmac_serial_console(void)
493{
494	struct device_node *prom_stdout = NULL;
495	int offset = 0;
496	const char *name;
497#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
498	char *devname = "ttyS";
499#else
500	char *devname = "ttyPZ";
501#endif
502
503	pr_debug(" -> check_pmac_serial_console()\n");
504
505	/* The user has requested a console so this is already set up. */
506	if (strstr(boot_command_line, "console=")) {
507		pr_debug(" console was specified !\n");
508		return -EBUSY;
509	}
510
511	if (!of_chosen) {
512		pr_debug(" of_chosen is NULL !\n");
513		return -ENODEV;
514	}
515
516	/* We are getting a weird phandle from OF ... */
517	/* ... So use the full path instead */
518	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
519	if (name == NULL) {
520		pr_debug(" no linux,stdout-path !\n");
521		return -ENODEV;
522	}
523	prom_stdout = of_find_node_by_path(name);
524	if (!prom_stdout) {
525		pr_debug(" can't find stdout package %s !\n", name);
526		return -ENODEV;
527	}
528	pr_debug("stdout is %pOF\n", prom_stdout);
529
530	if (of_node_name_eq(prom_stdout, "ch-a"))
531		offset = 0;
532	else if (of_node_name_eq(prom_stdout, "ch-b"))
533		offset = 1;
534	else
535		goto not_found;
536	of_node_put(prom_stdout);
537
538	pr_debug("Found serial console at %s%d\n", devname, offset);
539
540	return add_preferred_console(devname, offset, NULL);
541
542 not_found:
543	pr_debug("No preferred console found !\n");
544	of_node_put(prom_stdout);
545	return -ENODEV;
546}
547console_initcall(check_pmac_serial_console);
548
549#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
550
551/*
552 * Called very early, MMU is off, device-tree isn't unflattened
553 */
554static int __init pmac_probe(void)
555{
556	if (!of_machine_is_compatible("Power Macintosh") &&
557	    !of_machine_is_compatible("MacRISC"))
558		return 0;
559
560#ifdef CONFIG_PPC32
561	/* isa_io_base gets set in pmac_pci_init */
562	DMA_MODE_READ = 1;
563	DMA_MODE_WRITE = 2;
564#endif /* CONFIG_PPC32 */
565
566	pm_power_off = pmac_power_off;
567
568	pmac_init();
569
570	return 1;
571}
572
573define_machine(powermac) {
574	.name			= "PowerMac",
575	.probe			= pmac_probe,
576	.setup_arch		= pmac_setup_arch,
577	.discover_phbs		= pmac_pci_init,
578	.show_cpuinfo		= pmac_show_cpuinfo,
579	.init_IRQ		= pmac_pic_init,
580	.get_irq		= NULL,	/* changed later */
581	.pci_irq_fixup		= pmac_pci_irq_fixup,
582	.restart		= pmac_restart,
583	.halt			= pmac_halt,
584	.time_init		= pmac_time_init,
585	.get_boot_time		= pmac_get_boot_time,
586	.set_rtc_time		= pmac_set_rtc_time,
587	.get_rtc_time		= pmac_get_rtc_time,
588	.calibrate_decr		= pmac_calibrate_decr,
589	.feature_call		= pmac_do_feature_call,
590	.progress		= udbg_progress,
591#ifdef CONFIG_PPC64
592	.power_save		= power4_idle,
593	.enable_pmcs		= power4_enable_pmcs,
594#endif /* CONFIG_PPC64 */
595#ifdef CONFIG_PPC32
596	.pcibios_after_init	= pmac_pcibios_after_init,
597	.phys_mem_access_prot	= pci_phys_mem_access_prot,
598#endif
599};