1/*
2 *  Powermac setup and early boot code plus other random bits.
3 *
4 *  PowerPC version
5 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
6 *
7 *  Adapted for Power Macintosh by Paul Mackerras
8 *    Copyright (C) 1996 Paul Mackerras (paulus@samba.org)
9 *
10 *  Derived from "arch/alpha/kernel/setup.c"
11 *    Copyright (C) 1995 Linus Torvalds
12 *
13 *  Maintained by Benjamin Herrenschmidt (benh@kernel.crashing.org)
14 *
15 *  This program is free software; you can redistribute it and/or
16 *  modify it under the terms of the GNU General Public License
17 *  as published by the Free Software Foundation; either version
18 *  2 of the License, or (at your option) any later version.
19 *
20 */
21
22/*
23 * bootup setup stuff..
24 */
25
26#include <linux/init.h>
27#include <linux/errno.h>
28#include <linux/sched.h>
29#include <linux/kernel.h>
30#include <linux/mm.h>
31#include <linux/stddef.h>
32#include <linux/unistd.h>
33#include <linux/ptrace.h>
34#include <linux/export.h>
35#include <linux/user.h>
36#include <linux/tty.h>
37#include <linux/string.h>
38#include <linux/delay.h>
39#include <linux/ioport.h>
40#include <linux/major.h>
41#include <linux/initrd.h>
42#include <linux/vt_kern.h>
43#include <linux/console.h>
44#include <linux/pci.h>
45#include <linux/adb.h>
46#include <linux/cuda.h>
47#include <linux/pmu.h>
48#include <linux/irq.h>
49#include <linux/seq_file.h>
50#include <linux/root_dev.h>
51#include <linux/bitops.h>
52#include <linux/suspend.h>
53#include <linux/of_device.h>
54#include <linux/of_platform.h>
55#include <linux/memblock.h>
56
57#include <asm/reg.h>
58#include <asm/sections.h>
59#include <asm/prom.h>
60#include <asm/pgtable.h>
61#include <asm/io.h>
62#include <asm/pci-bridge.h>
63#include <asm/ohare.h>
64#include <asm/mediabay.h>
65#include <asm/machdep.h>
66#include <asm/dma.h>
67#include <asm/cputable.h>
68#include <asm/btext.h>
69#include <asm/pmac_feature.h>
70#include <asm/time.h>
71#include <asm/mmu_context.h>
72#include <asm/iommu.h>
73#include <asm/smu.h>
74#include <asm/pmc.h>
75#include <asm/udbg.h>
76
77#include "pmac.h"
78
79#undef SHOW_GATWICK_IRQS
80
81int ppc_override_l2cr = 0;
82int ppc_override_l2cr_value;
83int has_l2cache = 0;
84
85int pmac_newworld;
86
87static int current_root_goodness = -1;
88
89extern struct machdep_calls pmac_md;
90
91#define DEFAULT_ROOT_DEVICE Root_SDA1	/* sda1 - slightly silly choice */
92
93#ifdef CONFIG_PPC64
94int sccdbg;
95#endif
96
97sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
98EXPORT_SYMBOL(sys_ctrler);
99
100#ifdef CONFIG_PMAC_SMU
101unsigned long smu_cmdbuf_abs;
102EXPORT_SYMBOL(smu_cmdbuf_abs);
103#endif
104
105static void pmac_show_cpuinfo(struct seq_file *m)
106{
107	struct device_node *np;
108	const char *pp;
109	int plen;
110	int mbmodel;
111	unsigned int mbflags;
112	char* mbname;
113
114	mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
115				    PMAC_MB_INFO_MODEL, 0);
116	mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
117				    PMAC_MB_INFO_FLAGS, 0);
118	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
119			      (long) &mbname) != 0)
120		mbname = "Unknown";
121
122	/* find motherboard type */
123	seq_printf(m, "machine\t\t: ");
124	np = of_find_node_by_path("/");
125	if (np != NULL) {
126		pp = of_get_property(np, "model", NULL);
127		if (pp != NULL)
128			seq_printf(m, "%s\n", pp);
129		else
130			seq_printf(m, "PowerMac\n");
131		pp = of_get_property(np, "compatible", &plen);
132		if (pp != NULL) {
133			seq_printf(m, "motherboard\t:");
134			while (plen > 0) {
135				int l = strlen(pp) + 1;
136				seq_printf(m, " %s", pp);
137				plen -= l;
138				pp += l;
139			}
140			seq_printf(m, "\n");
141		}
142		of_node_put(np);
143	} else
144		seq_printf(m, "PowerMac\n");
145
146	/* print parsed model */
147	seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
148	seq_printf(m, "pmac flags\t: %08x\n", mbflags);
149
150	/* find l2 cache info */
151	np = of_find_node_by_name(NULL, "l2-cache");
152	if (np == NULL)
153		np = of_find_node_by_type(NULL, "cache");
154	if (np != NULL) {
155		const unsigned int *ic =
156			of_get_property(np, "i-cache-size", NULL);
157		const unsigned int *dc =
158			of_get_property(np, "d-cache-size", NULL);
159		seq_printf(m, "L2 cache\t:");
160		has_l2cache = 1;
161		if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
162			seq_printf(m, " %dK unified", *dc / 1024);
163		} else {
164			if (ic)
165				seq_printf(m, " %dK instruction", *ic / 1024);
166			if (dc)
167				seq_printf(m, "%s %dK data",
168					   (ic? " +": ""), *dc / 1024);
169		}
170		pp = of_get_property(np, "ram-type", NULL);
171		if (pp)
172			seq_printf(m, " %s", pp);
173		seq_printf(m, "\n");
174		of_node_put(np);
175	}
176
177	/* Indicate newworld/oldworld */
178	seq_printf(m, "pmac-generation\t: %s\n",
179		   pmac_newworld ? "NewWorld" : "OldWorld");
180}
181
182#ifndef CONFIG_ADB_CUDA
183int find_via_cuda(void)
184{
185	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");
186
187	if (!dn)
188		return 0;
189	of_node_put(dn);
190	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
191	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
192	return 0;
193}
194#endif
195
196#ifndef CONFIG_ADB_PMU
197int find_via_pmu(void)
198{
199	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");
200
201	if (!dn)
202		return 0;
203	of_node_put(dn);
204	printk("WARNING ! Your machine is PMU-based but your kernel\n");
205	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
206	return 0;
207}
208#endif
209
210#ifndef CONFIG_PMAC_SMU
211int smu_init(void)
212{
213	/* should check and warn if SMU is present */
214	return 0;
215}
216#endif
217
218#ifdef CONFIG_PPC32
219static volatile u32 *sysctrl_regs;
220
221static void __init ohare_init(void)
222{
223	struct device_node *dn;
224
225	/* this area has the CPU identification register
226	   and some registers used by smp boards */
227	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);
228
229	/*
230	 * Turn on the L2 cache.
231	 * We assume that we have a PSX memory controller iff
232	 * we have an ohare I/O controller.
233	 */
234	dn = of_find_node_by_name(NULL, "ohare");
235	if (dn) {
236		of_node_put(dn);
237		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
238			if (sysctrl_regs[4] & 0x10)
239				sysctrl_regs[4] |= 0x04000020;
240			else
241				sysctrl_regs[4] |= 0x04000000;
242			if(has_l2cache)
243				printk(KERN_INFO "Level 2 cache enabled\n");
244		}
245	}
246}
247
248static void __init l2cr_init(void)
249{
250	/* Checks "l2cr-value" property in the registry */
251	if (cpu_has_feature(CPU_FTR_L2CR)) {
252		struct device_node *np = of_find_node_by_name(NULL, "cpus");
253		if (np == 0)
254			np = of_find_node_by_type(NULL, "cpu");
255		if (np != 0) {
256			const unsigned int *l2cr =
257				of_get_property(np, "l2cr-value", NULL);
258			if (l2cr != 0) {
259				ppc_override_l2cr = 1;
260				ppc_override_l2cr_value = *l2cr;
261				_set_L2CR(0);
262				_set_L2CR(ppc_override_l2cr_value);
263			}
264			of_node_put(np);
265		}
266	}
267
268	if (ppc_override_l2cr)
269		printk(KERN_INFO "L2CR overridden (0x%x), "
270		       "backside cache is %s\n",
271		       ppc_override_l2cr_value,
272		       (ppc_override_l2cr_value & 0x80000000)
273				? "enabled" : "disabled");
274}
275#endif
276
277static void __init pmac_setup_arch(void)
278{
279	struct device_node *cpu, *ic;
280	const int *fp;
281	unsigned long pvr;
282
283	pvr = PVR_VER(mfspr(SPRN_PVR));
284
285	/* Set loops_per_jiffy to a half-way reasonable value,
286	   for use until calibrate_delay gets called. */
287	loops_per_jiffy = 50000000 / HZ;
288	cpu = of_find_node_by_type(NULL, "cpu");
289	if (cpu != NULL) {
290		fp = of_get_property(cpu, "clock-frequency", NULL);
291		if (fp != NULL) {
292			if (pvr >= 0x30 && pvr < 0x80)
293				/* PPC970 etc. */
294				loops_per_jiffy = *fp / (3 * HZ);
295			else if (pvr == 4 || pvr >= 8)
296				/* 604, G3, G4 etc. */
297				loops_per_jiffy = *fp / HZ;
298			else
299				/* 601, 603, etc. */
300				loops_per_jiffy = *fp / (2 * HZ);
301		}
302		of_node_put(cpu);
303	}
304
305	/* See if newworld or oldworld */
306	ic = of_find_node_with_property(NULL, "interrupt-controller");
307	if (ic) {
308		pmac_newworld = 1;
309		of_node_put(ic);
310	}
311
312	/* Lookup PCI hosts */
313	pmac_pci_init();
314
315#ifdef CONFIG_PPC32
316	ohare_init();
317	l2cr_init();
318#endif /* CONFIG_PPC32 */
319
320	find_via_cuda();
321	find_via_pmu();
322	smu_init();
323
324#if defined(CONFIG_NVRAM) || defined(CONFIG_NVRAM_MODULE) || \
325    defined(CONFIG_PPC64)
326	pmac_nvram_init();
327#endif
328
329#ifdef CONFIG_PPC32
330#ifdef CONFIG_BLK_DEV_INITRD
331	if (initrd_start)
332		ROOT_DEV = Root_RAM0;
333	else
334#endif
335		ROOT_DEV = DEFAULT_ROOT_DEVICE;
336#endif
337
338#ifdef CONFIG_ADB
339	if (strstr(boot_command_line, "adb_sync")) {
340		extern int __adb_probe_sync;
341		__adb_probe_sync = 1;
342	}
343#endif /* CONFIG_ADB */
344}
345
346#ifdef CONFIG_SCSI
347void note_scsi_host(struct device_node *node, void *host)
348{
349}
350EXPORT_SYMBOL(note_scsi_host);
351#endif
352
353static int initializing = 1;
354
355static int pmac_late_init(void)
356{
357	initializing = 0;
358	return 0;
359}
360machine_late_initcall(powermac, pmac_late_init);
361
362/*
363 * This is __init_refok because we check for "initializing" before
364 * touching any of the __init sensitive things and "initializing"
365 * will be false after __init time. This can't be __init because it
366 * can be called whenever a disk is first accessed.
367 */
368void __init_refok note_bootable_part(dev_t dev, int part, int goodness)
369{
370	char *p;
371
372	if (!initializing)
373		return;
374	if ((goodness <= current_root_goodness) &&
375	    ROOT_DEV != DEFAULT_ROOT_DEVICE)
376		return;
377	p = strstr(boot_command_line, "root=");
378	if (p != NULL && (p == boot_command_line || p[-1] == ' '))
379		return;
380
381	ROOT_DEV = dev + part;
382	current_root_goodness = goodness;
383}
384
385#ifdef CONFIG_ADB_CUDA
386static void cuda_restart(void)
387{
388	struct adb_request req;
389
390	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_RESET_SYSTEM);
391	for (;;)
392		cuda_poll();
393}
394
395static void cuda_shutdown(void)
396{
397	struct adb_request req;
398
399	cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_POWERDOWN);
400	for (;;)
401		cuda_poll();
402}
403
404#else
405#define cuda_restart()
406#define cuda_shutdown()
407#endif
408
409#ifndef CONFIG_ADB_PMU
410#define pmu_restart()
411#define pmu_shutdown()
412#endif
413
414#ifndef CONFIG_PMAC_SMU
415#define smu_restart()
416#define smu_shutdown()
417#endif
418
419static void pmac_restart(char *cmd)
420{
421	switch (sys_ctrler) {
422	case SYS_CTRLER_CUDA:
423		cuda_restart();
424		break;
425	case SYS_CTRLER_PMU:
426		pmu_restart();
427		break;
428	case SYS_CTRLER_SMU:
429		smu_restart();
430		break;
431	default: ;
432	}
433}
434
435static void pmac_power_off(void)
436{
437	switch (sys_ctrler) {
438	case SYS_CTRLER_CUDA:
439		cuda_shutdown();
440		break;
441	case SYS_CTRLER_PMU:
442		pmu_shutdown();
443		break;
444	case SYS_CTRLER_SMU:
445		smu_shutdown();
446		break;
447	default: ;
448	}
449}
450
451static void
452pmac_halt(void)
453{
454	pmac_power_off();
455}
456
457/*
458 * Early initialization.
459 */
460static void __init pmac_init_early(void)
461{
462	/* Enable early btext debug if requested */
463	if (strstr(boot_command_line, "btextdbg")) {
464		udbg_adb_init_early();
465		register_early_udbg_console();
466	}
467
468	/* Probe motherboard chipset */
469	pmac_feature_init();
470
471	/* Initialize debug stuff */
472	udbg_scc_init(!!strstr(boot_command_line, "sccdbg"));
473	udbg_adb_init(!!strstr(boot_command_line, "btextdbg"));
474
475#ifdef CONFIG_PPC64
476	iommu_init_early_dart();
477#endif
478
479	/* SMP Init has to be done early as we need to patch up
480	 * cpu_possible_mask before interrupt stacks are allocated
481	 * or kaboom...
482	 */
483#ifdef CONFIG_SMP
484	pmac_setup_smp();
485#endif
486}
487
488static int __init pmac_declare_of_platform_devices(void)
489{
490	struct device_node *np;
491
492	if (machine_is(chrp))
493		return -1;
494
495	np = of_find_node_by_name(NULL, "valkyrie");
496	if (np) {
497		of_platform_device_create(np, "valkyrie", NULL);
498		of_node_put(np);
499	}
500	np = of_find_node_by_name(NULL, "platinum");
501	if (np) {
502		of_platform_device_create(np, "platinum", NULL);
503		of_node_put(np);
504	}
505        np = of_find_node_by_type(NULL, "smu");
506        if (np) {
507		of_platform_device_create(np, "smu", NULL);
508		of_node_put(np);
509	}
510	np = of_find_node_by_type(NULL, "fcu");
511	if (np == NULL) {
512		/* Some machines have strangely broken device-tree */
513		np = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/fan@15e");
514	}
515	if (np) {
516		of_platform_device_create(np, "temperature", NULL);
517		of_node_put(np);
518	}
519
520	return 0;
521}
522machine_device_initcall(powermac, pmac_declare_of_platform_devices);
523
524#ifdef CONFIG_SERIAL_PMACZILOG_CONSOLE
525/*
526 * This is called very early, as part of console_init() (typically just after
527 * time_init()). This function is respondible for trying to find a good
528 * default console on serial ports. It tries to match the open firmware
529 * default output with one of the available serial console drivers.
530 */
531static int __init check_pmac_serial_console(void)
532{
533	struct device_node *prom_stdout = NULL;
534	int offset = 0;
535	const char *name;
536#ifdef CONFIG_SERIAL_PMACZILOG_TTYS
537	char *devname = "ttyS";
538#else
539	char *devname = "ttyPZ";
540#endif
541
542	pr_debug(" -> check_pmac_serial_console()\n");
543
544	/* The user has requested a console so this is already set up. */
545	if (strstr(boot_command_line, "console=")) {
546		pr_debug(" console was specified !\n");
547		return -EBUSY;
548	}
549
550	if (!of_chosen) {
551		pr_debug(" of_chosen is NULL !\n");
552		return -ENODEV;
553	}
554
555	/* We are getting a weird phandle from OF ... */
556	/* ... So use the full path instead */
557	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
558	if (name == NULL) {
559		pr_debug(" no linux,stdout-path !\n");
560		return -ENODEV;
561	}
562	prom_stdout = of_find_node_by_path(name);
563	if (!prom_stdout) {
564		pr_debug(" can't find stdout package %s !\n", name);
565		return -ENODEV;
566	}
567	pr_debug("stdout is %s\n", prom_stdout->full_name);
568
569	name = of_get_property(prom_stdout, "name", NULL);
570	if (!name) {
571		pr_debug(" stdout package has no name !\n");
572		goto not_found;
573	}
574
575	if (strcmp(name, "ch-a") == 0)
576		offset = 0;
577	else if (strcmp(name, "ch-b") == 0)
578		offset = 1;
579	else
580		goto not_found;
581	of_node_put(prom_stdout);
582
583	pr_debug("Found serial console at %s%d\n", devname, offset);
584
585	return add_preferred_console(devname, offset, NULL);
586
587 not_found:
588	pr_debug("No preferred console found !\n");
589	of_node_put(prom_stdout);
590	return -ENODEV;
591}
592console_initcall(check_pmac_serial_console);
593
594#endif /* CONFIG_SERIAL_PMACZILOG_CONSOLE */
595
596/*
597 * Called very early, MMU is off, device-tree isn't unflattened
598 */
599static int __init pmac_probe(void)
600{
601	unsigned long root = of_get_flat_dt_root();
602
603	if (!of_flat_dt_is_compatible(root, "Power Macintosh") &&
604	    !of_flat_dt_is_compatible(root, "MacRISC"))
605		return 0;
606
607#ifdef CONFIG_PPC64
608	/*
609	 * On U3, the DART (iommu) must be allocated now since it
610	 * has an impact on htab_initialize (due to the large page it
611	 * occupies having to be broken up so the DART itself is not
612	 * part of the cacheable linar mapping
613	 */
614	alloc_dart_table();
615
616	hpte_init_native();
617#endif
618
619#ifdef CONFIG_PPC32
620	/* isa_io_base gets set in pmac_pci_init */
621	ISA_DMA_THRESHOLD = ~0L;
622	DMA_MODE_READ = 1;
623	DMA_MODE_WRITE = 2;
624#endif /* CONFIG_PPC32 */
625
626#ifdef CONFIG_PMAC_SMU
627	/*
628	 * SMU based G5s need some memory below 2Gb, at least the current
629	 * driver needs that. We have to allocate it now. We allocate 4k
630	 * (1 small page) for now.
631	 */
632	smu_cmdbuf_abs = memblock_alloc_base(4096, 4096, 0x80000000UL);
633#endif /* CONFIG_PMAC_SMU */
634
635	return 1;
636}
637
638#ifdef CONFIG_PPC64
639/* Move that to pci.c */
640static int pmac_pci_probe_mode(struct pci_bus *bus)
641{
642	struct device_node *node = pci_bus_to_OF_node(bus);
643
644	/* We need to use normal PCI probing for the AGP bus,
645	 * since the device for the AGP bridge isn't in the tree.
646	 * Same for the PCIe host on U4 and the HT host bridge.
647	 */
648	if (bus->self == NULL && (of_device_is_compatible(node, "u3-agp") ||
649				  of_device_is_compatible(node, "u4-pcie") ||
650				  of_device_is_compatible(node, "u3-ht")))
651		return PCI_PROBE_NORMAL;
652	return PCI_PROBE_DEVTREE;
653}
654#endif /* CONFIG_PPC64 */
655
656define_machine(powermac) {
657	.name			= "PowerMac",
658	.probe			= pmac_probe,
659	.setup_arch		= pmac_setup_arch,
660	.init_early		= pmac_init_early,
661	.show_cpuinfo		= pmac_show_cpuinfo,
662	.init_IRQ		= pmac_pic_init,
663	.get_irq		= NULL,	/* changed later */
664	.pci_irq_fixup		= pmac_pci_irq_fixup,
665	.restart		= pmac_restart,
666	.power_off		= pmac_power_off,
667	.halt			= pmac_halt,
668	.time_init		= pmac_time_init,
669	.get_boot_time		= pmac_get_boot_time,
670	.set_rtc_time		= pmac_set_rtc_time,
671	.get_rtc_time		= pmac_get_rtc_time,
672	.calibrate_decr		= pmac_calibrate_decr,
673	.feature_call		= pmac_do_feature_call,
674	.progress		= udbg_progress,
675#ifdef CONFIG_PPC64
676	.pci_probe_mode		= pmac_pci_probe_mode,
677	.power_save		= power4_idle,
678	.enable_pmcs		= power4_enable_pmcs,
679#endif /* CONFIG_PPC64 */
680#ifdef CONFIG_PPC32
681	.pcibios_enable_device_hook = pmac_pci_enable_device_hook,
682	.pcibios_after_init	= pmac_pcibios_after_init,
683	.phys_mem_access_prot	= pci_phys_mem_access_prot,
684#endif
685};
686