1/*
2 *  Copyright (C) 1995  Linus Torvalds
3 *  Adapted from 'alpha' version by Gary Thomas
4 *  Modified by Cort Dougan (cort@cs.nmt.edu)
5 */
6
7/*
8 * bootup setup stuff..
9 */
10
11#include <linux/errno.h>
12#include <linux/sched.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/stddef.h>
16#include <linux/unistd.h>
17#include <linux/ptrace.h>
18#include <linux/user.h>
19#include <linux/tty.h>
20#include <linux/major.h>
21#include <linux/interrupt.h>
22#include <linux/reboot.h>
23#include <linux/init.h>
24#include <linux/pci.h>
25#include <generated/utsrelease.h>
26#include <linux/adb.h>
27#include <linux/module.h>
28#include <linux/delay.h>
29#include <linux/console.h>
30#include <linux/seq_file.h>
31#include <linux/root_dev.h>
32#include <linux/initrd.h>
33#include <linux/timer.h>
34
35#include <asm/io.h>
36#include <asm/pgtable.h>
37#include <asm/prom.h>
38#include <asm/pci-bridge.h>
39#include <asm/dma.h>
40#include <asm/machdep.h>
41#include <asm/irq.h>
42#include <asm/hydra.h>
43#include <asm/sections.h>
44#include <asm/time.h>
45#include <asm/i8259.h>
46#include <asm/mpic.h>
47#include <asm/rtas.h>
48#include <asm/xmon.h>
49
50#include "chrp.h"
51#include "gg2.h"
52
53void rtas_indicator_progress(char *, unsigned short);
54
55int _chrp_type;
56EXPORT_SYMBOL(_chrp_type);
57
58static struct mpic *chrp_mpic;
59
60/* Used for doing CHRP event-scans */
61DEFINE_PER_CPU(struct timer_list, heartbeat_timer);
62unsigned long event_scan_interval;
63
64extern unsigned long loops_per_jiffy;
65
66/* To be replaced by RTAS when available */
67static unsigned int __iomem *briq_SPOR;
68
69#ifdef CONFIG_SMP
70extern struct smp_ops_t chrp_smp_ops;
71#endif
72
73static const char *gg2_memtypes[4] = {
74	"FPM", "SDRAM", "EDO", "BEDO"
75};
76static const char *gg2_cachesizes[4] = {
77	"256 KB", "512 KB", "1 MB", "Reserved"
78};
79static const char *gg2_cachetypes[4] = {
80	"Asynchronous", "Reserved", "Flow-Through Synchronous",
81	"Pipelined Synchronous"
82};
83static const char *gg2_cachemodes[4] = {
84	"Disabled", "Write-Through", "Copy-Back", "Transparent Mode"
85};
86
87static const char *chrp_names[] = {
88	"Unknown",
89	"","","",
90	"Motorola",
91	"IBM or Longtrail",
92	"Genesi Pegasos",
93	"Total Impact Briq"
94};
95
96void chrp_show_cpuinfo(struct seq_file *m)
97{
98	int i, sdramen;
99	unsigned int t;
100	struct device_node *root;
101	const char *model = "";
102
103	root = of_find_node_by_path("/");
104	if (root)
105		model = of_get_property(root, "model", NULL);
106	seq_printf(m, "machine\t\t: CHRP %s\n", model);
107
108	/* longtrail (goldengate) stuff */
109	if (model && !strncmp(model, "IBM,LongTrail", 13)) {
110		/* VLSI VAS96011/12 `Golden Gate 2' */
111		/* Memory banks */
112		sdramen = (in_le32(gg2_pci_config_base + GG2_PCI_DRAM_CTRL)
113			   >>31) & 1;
114		for (i = 0; i < (sdramen ? 4 : 6); i++) {
115			t = in_le32(gg2_pci_config_base+
116						 GG2_PCI_DRAM_BANK0+
117						 i*4);
118			if (!(t & 1))
119				continue;
120			switch ((t>>8) & 0x1f) {
121			case 0x1f:
122				model = "4 MB";
123				break;
124			case 0x1e:
125				model = "8 MB";
126				break;
127			case 0x1c:
128				model = "16 MB";
129				break;
130			case 0x18:
131				model = "32 MB";
132				break;
133			case 0x10:
134				model = "64 MB";
135				break;
136			case 0x00:
137				model = "128 MB";
138				break;
139			default:
140				model = "Reserved";
141				break;
142			}
143			seq_printf(m, "memory bank %d\t: %s %s\n", i, model,
144				   gg2_memtypes[sdramen ? 1 : ((t>>1) & 3)]);
145		}
146		/* L2 cache */
147		t = in_le32(gg2_pci_config_base+GG2_PCI_CC_CTRL);
148		seq_printf(m, "board l2\t: %s %s (%s)\n",
149			   gg2_cachesizes[(t>>7) & 3],
150			   gg2_cachetypes[(t>>2) & 3],
151			   gg2_cachemodes[t & 3]);
152	}
153	of_node_put(root);
154}
155
156/*
157 *  Fixes for the National Semiconductor PC78308VUL SuperI/O
158 *
159 *  Some versions of Open Firmware incorrectly initialize the IRQ settings
160 *  for keyboard and mouse
161 */
162static inline void __init sio_write(u8 val, u8 index)
163{
164	outb(index, 0x15c);
165	outb(val, 0x15d);
166}
167
168static inline u8 __init sio_read(u8 index)
169{
170	outb(index, 0x15c);
171	return inb(0x15d);
172}
173
174static void __init sio_fixup_irq(const char *name, u8 device, u8 level,
175				     u8 type)
176{
177	u8 level0, type0, active;
178
179	/* select logical device */
180	sio_write(device, 0x07);
181	active = sio_read(0x30);
182	level0 = sio_read(0x70);
183	type0 = sio_read(0x71);
184	if (level0 != level || type0 != type || !active) {
185		printk(KERN_WARNING "sio: %s irq level %d, type %d, %sactive: "
186		       "remapping to level %d, type %d, active\n",
187		       name, level0, type0, !active ? "in" : "", level, type);
188		sio_write(0x01, 0x30);
189		sio_write(level, 0x70);
190		sio_write(type, 0x71);
191	}
192}
193
194static void __init sio_init(void)
195{
196	struct device_node *root;
197	const char *model;
198
199	root = of_find_node_by_path("/");
200	if (!root)
201		return;
202
203	model = of_get_property(root, "model", NULL);
204	if (model && !strncmp(model, "IBM,LongTrail", 13)) {
205		/* logical device 0 (KBC/Keyboard) */
206		sio_fixup_irq("keyboard", 0, 1, 2);
207		/* select logical device 1 (KBC/Mouse) */
208		sio_fixup_irq("mouse", 1, 12, 2);
209	}
210
211	of_node_put(root);
212}
213
214
215static void __init pegasos_set_l2cr(void)
216{
217	struct device_node *np;
218
219	/* On Pegasos, enable the l2 cache if needed, as the OF forgets it */
220	if (_chrp_type != _CHRP_Pegasos)
221		return;
222
223	/* Enable L2 cache if needed */
224	np = of_find_node_by_type(NULL, "cpu");
225	if (np != NULL) {
226		const unsigned int *l2cr = of_get_property(np, "l2cr", NULL);
227		if (l2cr == NULL) {
228			printk ("Pegasos l2cr : no cpu l2cr property found\n");
229			goto out;
230		}
231		if (!((*l2cr) & 0x80000000)) {
232			printk ("Pegasos l2cr : L2 cache was not active, "
233				"activating\n");
234			_set_L2CR(0);
235			_set_L2CR((*l2cr) | 0x80000000);
236		}
237	}
238out:
239	of_node_put(np);
240}
241
242static void briq_restart(char *cmd)
243{
244	local_irq_disable();
245	if (briq_SPOR)
246		out_be32(briq_SPOR, 0);
247	for(;;);
248}
249
250/*
251 * Per default, input/output-device points to the keyboard/screen
252 * If no card is installed, the built-in serial port is used as a fallback.
253 * But unfortunately, the firmware does not connect /chosen/{stdin,stdout}
254 * the the built-in serial node. Instead, a /failsafe node is created.
255 */
256static __init void chrp_init_early(void)
257{
258	struct device_node *node;
259	const char *property;
260
261	if (strstr(boot_command_line, "console="))
262		return;
263	/* find the boot console from /chosen/stdout */
264	if (!of_chosen)
265		return;
266	node = of_find_node_by_path("/");
267	if (!node)
268		return;
269	property = of_get_property(node, "model", NULL);
270	if (!property)
271		goto out_put;
272	if (strcmp(property, "Pegasos2"))
273		goto out_put;
274	/* this is a Pegasos2 */
275	property = of_get_property(of_chosen, "linux,stdout-path", NULL);
276	if (!property)
277		goto out_put;
278	of_node_put(node);
279	node = of_find_node_by_path(property);
280	if (!node)
281		return;
282	property = of_get_property(node, "device_type", NULL);
283	if (!property)
284		goto out_put;
285	if (strcmp(property, "serial"))
286		goto out_put;
287	/*
288	 * The 9pin connector is either /failsafe
289	 * or /pci@80000000/isa@C/serial@i2F8
290	 * The optional graphics card has also type 'serial' in VGA mode.
291	 */
292	property = of_get_property(node, "name", NULL);
293	if (!property)
294		goto out_put;
295	if (!strcmp(property, "failsafe") || !strcmp(property, "serial"))
296		add_preferred_console("ttyS", 0, NULL);
297out_put:
298	of_node_put(node);
299}
300
301void __init chrp_setup_arch(void)
302{
303	struct device_node *root = of_find_node_by_path("/");
304	const char *machine = NULL;
305
306	/* init to some ~sane value until calibrate_delay() runs */
307	loops_per_jiffy = 50000000/HZ;
308
309	if (root)
310		machine = of_get_property(root, "model", NULL);
311	if (machine && strncmp(machine, "Pegasos", 7) == 0) {
312		_chrp_type = _CHRP_Pegasos;
313	} else if (machine && strncmp(machine, "IBM", 3) == 0) {
314		_chrp_type = _CHRP_IBM;
315	} else if (machine && strncmp(machine, "MOT", 3) == 0) {
316		_chrp_type = _CHRP_Motorola;
317	} else if (machine && strncmp(machine, "TotalImpact,BRIQ-1", 18) == 0) {
318		_chrp_type = _CHRP_briq;
319		/* Map the SPOR register on briq and change the restart hook */
320		briq_SPOR = ioremap(0xff0000e8, 4);
321		ppc_md.restart = briq_restart;
322	} else {
323		/* Let's assume it is an IBM chrp if all else fails */
324		_chrp_type = _CHRP_IBM;
325	}
326	of_node_put(root);
327	printk("chrp type = %x [%s]\n", _chrp_type, chrp_names[_chrp_type]);
328
329	rtas_initialize();
330	if (rtas_token("display-character") >= 0)
331		ppc_md.progress = rtas_progress;
332
333	/* use RTAS time-of-day routines if available */
334	if (rtas_token("get-time-of-day") != RTAS_UNKNOWN_SERVICE) {
335		ppc_md.get_boot_time	= rtas_get_boot_time;
336		ppc_md.get_rtc_time	= rtas_get_rtc_time;
337		ppc_md.set_rtc_time	= rtas_set_rtc_time;
338	}
339
340	/* On pegasos, enable the L2 cache if not already done by OF */
341	pegasos_set_l2cr();
342
343	/* Lookup PCI host bridges */
344	chrp_find_bridges();
345
346	/*
347	 *  Temporary fixes for PCI devices.
348	 *  -- Geert
349	 */
350	hydra_init();		/* Mac I/O */
351
352	/*
353	 *  Fix the Super I/O configuration
354	 */
355	sio_init();
356
357	pci_create_OF_bus_map();
358
359	/*
360	 * Print the banner, then scroll down so boot progress
361	 * can be printed.  -- Cort
362	 */
363	if (ppc_md.progress) ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0x0);
364}
365
366static void chrp_8259_cascade(struct irq_desc *desc)
367{
368	struct irq_chip *chip = irq_desc_get_chip(desc);
369	unsigned int cascade_irq = i8259_irq();
370
371	if (cascade_irq != NO_IRQ)
372		generic_handle_irq(cascade_irq);
373
374	chip->irq_eoi(&desc->irq_data);
375}
376
377/*
378 * Finds the open-pic node and sets up the mpic driver.
379 */
380static void __init chrp_find_openpic(void)
381{
382	struct device_node *np, *root;
383	int len, i, j;
384	int isu_size, idu_size;
385	const unsigned int *iranges, *opprop = NULL;
386	int oplen = 0;
387	unsigned long opaddr;
388	int na = 1;
389
390	np = of_find_node_by_type(NULL, "open-pic");
391	if (np == NULL)
392		return;
393	root = of_find_node_by_path("/");
394	if (root) {
395		opprop = of_get_property(root, "platform-open-pic", &oplen);
396		na = of_n_addr_cells(root);
397	}
398	if (opprop && oplen >= na * sizeof(unsigned int)) {
399		opaddr = opprop[na-1];	/* assume 32-bit */
400		oplen /= na * sizeof(unsigned int);
401	} else {
402		struct resource r;
403		if (of_address_to_resource(np, 0, &r)) {
404			goto bail;
405		}
406		opaddr = r.start;
407		oplen = 0;
408	}
409
410	printk(KERN_INFO "OpenPIC at %lx\n", opaddr);
411
412	iranges = of_get_property(np, "interrupt-ranges", &len);
413	if (iranges == NULL)
414		len = 0;	/* non-distributed mpic */
415	else
416		len /= 2 * sizeof(unsigned int);
417
418	/*
419	 * The first pair of cells in interrupt-ranges refers to the
420	 * IDU; subsequent pairs refer to the ISUs.
421	 */
422	if (oplen < len) {
423		printk(KERN_ERR "Insufficient addresses for distributed"
424		       " OpenPIC (%d < %d)\n", oplen, len);
425		len = oplen;
426	}
427
428	isu_size = 0;
429	idu_size = 0;
430	if (len > 0 && iranges[1] != 0) {
431		printk(KERN_INFO "OpenPIC irqs %d..%d in IDU\n",
432		       iranges[0], iranges[0] + iranges[1] - 1);
433		idu_size = iranges[1];
434	}
435	if (len > 1)
436		isu_size = iranges[3];
437
438	chrp_mpic = mpic_alloc(np, opaddr, MPIC_NO_RESET,
439			isu_size, 0, " MPIC    ");
440	if (chrp_mpic == NULL) {
441		printk(KERN_ERR "Failed to allocate MPIC structure\n");
442		goto bail;
443	}
444	j = na - 1;
445	for (i = 1; i < len; ++i) {
446		iranges += 2;
447		j += na;
448		printk(KERN_INFO "OpenPIC irqs %d..%d in ISU at %x\n",
449		       iranges[0], iranges[0] + iranges[1] - 1,
450		       opprop[j]);
451		mpic_assign_isu(chrp_mpic, i - 1, opprop[j]);
452	}
453
454	mpic_init(chrp_mpic);
455	ppc_md.get_irq = mpic_get_irq;
456 bail:
457	of_node_put(root);
458	of_node_put(np);
459}
460
461#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
462static struct irqaction xmon_irqaction = {
463	.handler = xmon_irq,
464	.name = "XMON break",
465};
466#endif
467
468static void __init chrp_find_8259(void)
469{
470	struct device_node *np, *pic = NULL;
471	unsigned long chrp_int_ack = 0;
472	unsigned int cascade_irq;
473
474	/* Look for cascade */
475	for_each_node_by_type(np, "interrupt-controller")
476		if (of_device_is_compatible(np, "chrp,iic")) {
477			pic = np;
478			break;
479		}
480	/* Ok, 8259 wasn't found. We need to handle the case where
481	 * we have a pegasos that claims to be chrp but doesn't have
482	 * a proper interrupt tree
483	 */
484	if (pic == NULL && chrp_mpic != NULL) {
485		printk(KERN_ERR "i8259: Not found in device-tree"
486		       " assuming no legacy interrupts\n");
487		return;
488	}
489
490	/* Look for intack. In a perfect world, we would look for it on
491	 * the ISA bus that holds the 8259 but heh... Works that way. If
492	 * we ever see a problem, we can try to re-use the pSeries code here.
493	 * Also, Pegasos-type platforms don't have a proper node to start
494	 * from anyway
495	 */
496	for_each_node_by_name(np, "pci") {
497		const unsigned int *addrp = of_get_property(np,
498				"8259-interrupt-acknowledge", NULL);
499
500		if (addrp == NULL)
501			continue;
502		chrp_int_ack = addrp[of_n_addr_cells(np)-1];
503		break;
504	}
505	of_node_put(np);
506	if (np == NULL)
507		printk(KERN_WARNING "Cannot find PCI interrupt acknowledge"
508		       " address, polling\n");
509
510	i8259_init(pic, chrp_int_ack);
511	if (ppc_md.get_irq == NULL) {
512		ppc_md.get_irq = i8259_irq;
513		irq_set_default_host(i8259_get_host());
514	}
515	if (chrp_mpic != NULL) {
516		cascade_irq = irq_of_parse_and_map(pic, 0);
517		if (cascade_irq == NO_IRQ)
518			printk(KERN_ERR "i8259: failed to map cascade irq\n");
519		else
520			irq_set_chained_handler(cascade_irq,
521						chrp_8259_cascade);
522	}
523}
524
525void __init chrp_init_IRQ(void)
526{
527#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
528	struct device_node *kbd;
529#endif
530	chrp_find_openpic();
531	chrp_find_8259();
532
533#ifdef CONFIG_SMP
534	/* Pegasos has no MPIC, those ops would make it crash. It might be an
535	 * option to move setting them to after we probe the PIC though
536	 */
537	if (chrp_mpic != NULL)
538		smp_ops = &chrp_smp_ops;
539#endif /* CONFIG_SMP */
540
541	if (_chrp_type == _CHRP_Pegasos)
542		ppc_md.get_irq        = i8259_irq;
543
544#if defined(CONFIG_VT) && defined(CONFIG_INPUT_ADBHID) && defined(CONFIG_XMON)
545	/* see if there is a keyboard in the device tree
546	   with a parent of type "adb" */
547	for_each_node_by_name(kbd, "keyboard")
548		if (kbd->parent && kbd->parent->type
549		    && strcmp(kbd->parent->type, "adb") == 0)
550			break;
551	of_node_put(kbd);
552	if (kbd)
553		setup_irq(HYDRA_INT_ADB_NMI, &xmon_irqaction);
554#endif
555}
556
557void __init
558chrp_init2(void)
559{
560#ifdef CONFIG_NVRAM
561	chrp_nvram_init();
562#endif
563
564	request_region(0x20,0x20,"pic1");
565	request_region(0xa0,0x20,"pic2");
566	request_region(0x00,0x20,"dma1");
567	request_region(0x40,0x20,"timer");
568	request_region(0x80,0x10,"dma page reg");
569	request_region(0xc0,0x20,"dma2");
570
571	if (ppc_md.progress)
572		ppc_md.progress("  Have fun!    ", 0x7777);
573}
574
575static int __init chrp_probe(void)
576{
577	const char *dtype = of_get_flat_dt_prop(of_get_flat_dt_root(),
578						"device_type", NULL);
579 	if (dtype == NULL)
580 		return 0;
581 	if (strcmp(dtype, "chrp"))
582		return 0;
583
584	ISA_DMA_THRESHOLD = ~0L;
585	DMA_MODE_READ = 0x44;
586	DMA_MODE_WRITE = 0x48;
587
588	pm_power_off = rtas_power_off;
589
590	return 1;
591}
592
593define_machine(chrp) {
594	.name			= "CHRP",
595	.probe			= chrp_probe,
596	.setup_arch		= chrp_setup_arch,
597	.init			= chrp_init2,
598	.init_early		= chrp_init_early,
599	.show_cpuinfo		= chrp_show_cpuinfo,
600	.init_IRQ		= chrp_init_IRQ,
601	.restart		= rtas_restart,
602	.halt			= rtas_halt,
603	.time_init		= chrp_time_init,
604	.set_rtc_time		= chrp_set_rtc_time,
605	.get_rtc_time		= chrp_get_rtc_time,
606	.calibrate_decr		= generic_calibrate_decr,
607	.phys_mem_access_prot	= pci_phys_mem_access_prot,
608};
609