1/*  $Id: setup.c,v 1.1.1.1 2007/08/03 18:52:17 Exp $
2 *  linux/arch/sparc/kernel/setup.c
3 *
4 *  Copyright (C) 1995  David S. Miller (davem@caip.rutgers.edu)
5 *  Copyright (C) 2000  Anton Blanchard (anton@samba.org)
6 */
7
8#include <linux/errno.h>
9#include <linux/sched.h>
10#include <linux/kernel.h>
11#include <linux/mm.h>
12#include <linux/stddef.h>
13#include <linux/unistd.h>
14#include <linux/ptrace.h>
15#include <linux/slab.h>
16#include <linux/initrd.h>
17#include <asm/smp.h>
18#include <linux/user.h>
19#include <linux/a.out.h>
20#include <linux/screen_info.h>
21#include <linux/delay.h>
22#include <linux/fs.h>
23#include <linux/seq_file.h>
24#include <linux/syscalls.h>
25#include <linux/kdev_t.h>
26#include <linux/major.h>
27#include <linux/string.h>
28#include <linux/init.h>
29#include <linux/interrupt.h>
30#include <linux/console.h>
31#include <linux/spinlock.h>
32#include <linux/root_dev.h>
33#include <linux/cpu.h>
34#include <linux/kdebug.h>
35
36#include <asm/system.h>
37#include <asm/io.h>
38#include <asm/processor.h>
39#include <asm/oplib.h>
40#include <asm/page.h>
41#include <asm/pgtable.h>
42#include <asm/traps.h>
43#include <asm/vaddrs.h>
44#include <asm/mbus.h>
45#include <asm/idprom.h>
46#include <asm/machines.h>
47#include <asm/cpudata.h>
48#include <asm/setup.h>
49
50struct screen_info screen_info = {
51	0, 0,			/* orig-x, orig-y */
52	0,			/* unused */
53	0,			/* orig-video-page */
54	0,			/* orig-video-mode */
55	128,			/* orig-video-cols */
56	0,0,0,			/* ega_ax, ega_bx, ega_cx */
57	54,			/* orig-video-lines */
58	0,                      /* orig-video-isVGA */
59	16                      /* orig-video-points */
60};
61
62/* Typing sync at the prom prompt calls the function pointed to by
63 * romvec->pv_synchook which I set to the following function.
64 * This should sync all filesystems and return, for now it just
65 * prints out pretty messages and returns.
66 */
67
68extern unsigned long trapbase;
69void (*prom_palette)(int);
70
71/* Pretty sick eh? */
72void prom_sync_me(void)
73{
74	unsigned long prom_tbr, flags;
75
76	local_irq_save(flags);
77	__asm__ __volatile__("rd %%tbr, %0\n\t" : "=r" (prom_tbr));
78	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
79			     "nop\n\t"
80			     "nop\n\t"
81			     "nop\n\t" : : "r" (&trapbase));
82
83	if (prom_palette)
84		prom_palette(1);
85	prom_printf("PROM SYNC COMMAND...\n");
86	show_free_areas();
87	if(current->pid != 0) {
88		local_irq_enable();
89		sys_sync();
90		local_irq_disable();
91	}
92	prom_printf("Returning to prom\n");
93
94	__asm__ __volatile__("wr %0, 0x0, %%tbr\n\t"
95			     "nop\n\t"
96			     "nop\n\t"
97			     "nop\n\t" : : "r" (prom_tbr));
98	local_irq_restore(flags);
99
100	return;
101}
102
103unsigned int boot_flags __initdata = 0;
104#define BOOTME_DEBUG  0x1
105
106/* Exported for mm/init.c:paging_init. */
107unsigned long cmdline_memory_size __initdata = 0;
108
109static void
110prom_console_write(struct console *con, const char *s, unsigned n)
111{
112	prom_write(s, n);
113}
114
115static struct console prom_debug_console = {
116	.name =		"debug",
117	.write =	prom_console_write,
118	.flags =	CON_PRINTBUFFER,
119	.index =	-1,
120};
121
122/*
123 * Process kernel command line switches that are specific to the
124 * SPARC or that require special low-level processing.
125 */
126static void __init process_switch(char c)
127{
128	switch (c) {
129	case 'd':
130		boot_flags |= BOOTME_DEBUG;
131		break;
132	case 's':
133		break;
134	case 'h':
135		prom_printf("boot_flags_init: Halt!\n");
136		prom_halt();
137		break;
138	case 'p':
139		/* Use PROM debug console. */
140		register_console(&prom_debug_console);
141		break;
142	default:
143		printk("Unknown boot switch (-%c)\n", c);
144		break;
145	}
146}
147
148static void __init process_console(char *commands)
149{
150	serial_console = 0;
151	commands += 8;
152	/* Linux-style serial */
153	if (!strncmp(commands, "ttyS", 4))
154		serial_console = simple_strtoul(commands + 4, NULL, 10) + 1;
155	else if (!strncmp(commands, "tty", 3)) {
156		char c = *(commands + 3);
157		/* Solaris-style serial */
158		if (c == 'a' || c == 'b')
159			serial_console = c - 'a' + 1;
160		/* else Linux-style fbcon, not serial */
161	}
162#if defined(CONFIG_PROM_CONSOLE)
163	if (!strncmp(commands, "prom", 4)) {
164		char *p;
165
166		for (p = commands - 8; *p && *p != ' '; p++)
167			*p = ' ';
168		conswitchp = &prom_con;
169	}
170#endif
171}
172
173static void __init boot_flags_init(char *commands)
174{
175	while (*commands) {
176		/* Move to the start of the next "argument". */
177		while (*commands && *commands == ' ')
178			commands++;
179
180		/* Process any command switches, otherwise skip it. */
181		if (*commands == '\0')
182			break;
183		if (*commands == '-') {
184			commands++;
185			while (*commands && *commands != ' ')
186				process_switch(*commands++);
187			continue;
188		}
189		if (!strncmp(commands, "console=", 8)) {
190			process_console(commands);
191		} else if (!strncmp(commands, "mem=", 4)) {
192			cmdline_memory_size = simple_strtoul(commands + 4,
193						     &commands, 0);
194			if (*commands == 'K' || *commands == 'k') {
195				cmdline_memory_size <<= 10;
196				commands++;
197			} else if (*commands=='M' || *commands=='m') {
198				cmdline_memory_size <<= 20;
199				commands++;
200			}
201		}
202		while (*commands && *commands != ' ')
203			commands++;
204	}
205}
206
207/* This routine will in the future do all the nasty prom stuff
208 * to probe for the mmu type and its parameters, etc. This will
209 * also be where SMP things happen plus the Sparc specific memory
210 * physical memory probe as on the alpha.
211 */
212
213extern int prom_probe_memory(void);
214extern void sun4c_probe_vac(void);
215extern char cputypval;
216extern unsigned long start, end;
217extern void panic_setup(char *, int *);
218
219extern unsigned short root_flags;
220extern unsigned short root_dev;
221extern unsigned short ram_flags;
222#define RAMDISK_IMAGE_START_MASK	0x07FF
223#define RAMDISK_PROMPT_FLAG		0x8000
224#define RAMDISK_LOAD_FLAG		0x4000
225
226extern int root_mountflags;
227
228char reboot_command[COMMAND_LINE_SIZE];
229enum sparc_cpu sparc_cpu_model;
230
231struct tt_entry *sparc_ttable;
232
233struct pt_regs fake_swapper_regs;
234
235void __init setup_arch(char **cmdline_p)
236{
237	int i;
238	unsigned long highest_paddr;
239
240	sparc_ttable = (struct tt_entry *) &start;
241
242	/* Initialize PROM console and command line. */
243	*cmdline_p = prom_getbootargs();
244	strcpy(boot_command_line, *cmdline_p);
245
246	/* Set sparc_cpu_model */
247	sparc_cpu_model = sun_unknown;
248	if(!strcmp(&cputypval,"sun4 ")) { sparc_cpu_model=sun4; }
249	if(!strcmp(&cputypval,"sun4c")) { sparc_cpu_model=sun4c; }
250	if(!strcmp(&cputypval,"sun4m")) { sparc_cpu_model=sun4m; }
251	if(!strcmp(&cputypval,"sun4s")) { sparc_cpu_model=sun4m; }  /* CP-1200 with PROM 2.30 -E */
252	if(!strcmp(&cputypval,"sun4d")) { sparc_cpu_model=sun4d; }
253	if(!strcmp(&cputypval,"sun4e")) { sparc_cpu_model=sun4e; }
254	if(!strcmp(&cputypval,"sun4u")) { sparc_cpu_model=sun4u; }
255
256#ifdef CONFIG_SUN4
257	if (sparc_cpu_model != sun4) {
258		prom_printf("This kernel is for Sun4 architecture only.\n");
259		prom_halt();
260	}
261#endif
262	printk("ARCH: ");
263	switch(sparc_cpu_model) {
264	case sun4:
265		printk("SUN4\n");
266		break;
267	case sun4c:
268		printk("SUN4C\n");
269		break;
270	case sun4m:
271		printk("SUN4M\n");
272		break;
273	case sun4d:
274		printk("SUN4D\n");
275		break;
276	case sun4e:
277		printk("SUN4E\n");
278		break;
279	case sun4u:
280		printk("SUN4U\n");
281		break;
282	default:
283		printk("UNKNOWN!\n");
284		break;
285	};
286
287#ifdef CONFIG_DUMMY_CONSOLE
288	conswitchp = &dummy_con;
289#elif defined(CONFIG_PROM_CONSOLE)
290	conswitchp = &prom_con;
291#endif
292	boot_flags_init(*cmdline_p);
293
294	idprom_init();
295	if (ARCH_SUN4C_SUN4)
296		sun4c_probe_vac();
297	load_mmu();
298	(void) prom_probe_memory();
299
300	phys_base = 0xffffffffUL;
301	highest_paddr = 0UL;
302	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
303		unsigned long top;
304
305		if (sp_banks[i].base_addr < phys_base)
306			phys_base = sp_banks[i].base_addr;
307		top = sp_banks[i].base_addr +
308			sp_banks[i].num_bytes;
309		if (highest_paddr < top)
310			highest_paddr = top;
311	}
312	pfn_base = phys_base >> PAGE_SHIFT;
313
314	if (!root_flags)
315		root_mountflags &= ~MS_RDONLY;
316	ROOT_DEV = old_decode_dev(root_dev);
317#ifdef CONFIG_BLK_DEV_RAM
318	rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
319	rd_prompt = ((ram_flags & RAMDISK_PROMPT_FLAG) != 0);
320	rd_doload = ((ram_flags & RAMDISK_LOAD_FLAG) != 0);
321#endif
322
323	prom_setsync(prom_sync_me);
324
325	if((boot_flags&BOOTME_DEBUG) && (linux_dbvec!=0) &&
326	   ((*(short *)linux_dbvec) != -1)) {
327		printk("Booted under KADB. Syncing trap table.\n");
328		(*(linux_dbvec->teach_debugger))();
329	}
330
331	init_mm.context = (unsigned long) NO_CONTEXT;
332	init_task.thread.kregs = &fake_swapper_regs;
333
334	paging_init();
335
336	smp_setup_cpu_possible_map();
337}
338
339static int __init set_preferred_console(void)
340{
341	int idev, odev;
342
343	/* The user has requested a console so this is already set up. */
344	if (serial_console >= 0)
345		return -EBUSY;
346
347	idev = prom_query_input_device();
348	odev = prom_query_output_device();
349	if (idev == PROMDEV_IKBD && odev == PROMDEV_OSCREEN) {
350		serial_console = 0;
351	} else if (idev == PROMDEV_ITTYA && odev == PROMDEV_OTTYA) {
352		serial_console = 1;
353	} else if (idev == PROMDEV_ITTYB && odev == PROMDEV_OTTYB) {
354		serial_console = 2;
355	} else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OTTYA) {
356		prom_printf("MrCoffee ttya\n");
357		serial_console = 1;
358	} else if (idev == PROMDEV_I_UNK && odev == PROMDEV_OSCREEN) {
359		serial_console = 0;
360		prom_printf("MrCoffee keyboard\n");
361	} else {
362		prom_printf("Confusing console (idev %d, odev %d)\n",
363		    idev, odev);
364		serial_console = 1;
365	}
366
367	if (serial_console)
368		return add_preferred_console("ttyS", serial_console - 1, NULL);
369
370	return -ENODEV;
371}
372console_initcall(set_preferred_console);
373
374extern char *sparc_cpu_type;
375extern char *sparc_fpu_type;
376
377static int ncpus_probed;
378
379static int show_cpuinfo(struct seq_file *m, void *__unused)
380{
381	seq_printf(m,
382		   "cpu\t\t: %s\n"
383		   "fpu\t\t: %s\n"
384		   "promlib\t\t: Version %d Revision %d\n"
385		   "prom\t\t: %d.%d\n"
386		   "type\t\t: %s\n"
387		   "ncpus probed\t: %d\n"
388		   "ncpus active\t: %d\n"
389#ifndef CONFIG_SMP
390		   "CPU0Bogo\t: %lu.%02lu\n"
391		   "CPU0ClkTck\t: %ld\n"
392#endif
393		   ,
394		   sparc_cpu_type ? sparc_cpu_type : "undetermined",
395		   sparc_fpu_type ? sparc_fpu_type : "undetermined",
396		   romvec->pv_romvers,
397		   prom_rev,
398		   romvec->pv_printrev >> 16,
399		   romvec->pv_printrev & 0xffff,
400		   &cputypval,
401		   ncpus_probed,
402		   num_online_cpus()
403#ifndef CONFIG_SMP
404		   , cpu_data(0).udelay_val/(500000/HZ),
405		   (cpu_data(0).udelay_val/(5000/HZ)) % 100,
406		   cpu_data(0).clock_tick
407#endif
408		);
409
410#ifdef CONFIG_SMP
411	smp_bogo(m);
412#endif
413	mmu_info(m);
414#ifdef CONFIG_SMP
415	smp_info(m);
416#endif
417	return 0;
418}
419
420static void *c_start(struct seq_file *m, loff_t *pos)
421{
422	/* The pointer we are returning is arbitrary,
423	 * it just has to be non-NULL and not IS_ERR
424	 * in the success case.
425	 */
426	return *pos == 0 ? &c_start : NULL;
427}
428
429static void *c_next(struct seq_file *m, void *v, loff_t *pos)
430{
431	++*pos;
432	return c_start(m, pos);
433}
434
435static void c_stop(struct seq_file *m, void *v)
436{
437}
438
439struct seq_operations cpuinfo_op = {
440	.start =c_start,
441	.next =	c_next,
442	.stop =	c_stop,
443	.show =	show_cpuinfo,
444};
445
446extern int stop_a_enabled;
447
448void sun_do_break(void)
449{
450	if (!stop_a_enabled)
451		return;
452
453	printk("\n");
454	flush_user_windows();
455
456	prom_cmdline();
457}
458
459int serial_console = -1;
460int stop_a_enabled = 1;
461
462static int __init topology_init(void)
463{
464	int i, ncpus, err;
465
466	/* Count the number of physically present processors in
467	 * the machine, even on uniprocessor, so that /proc/cpuinfo
468	 * output is consistent with 2.4.x
469	 */
470	ncpus = 0;
471	while (!cpu_find_by_instance(ncpus, NULL, NULL))
472		ncpus++;
473	ncpus_probed = ncpus;
474
475	err = 0;
476	for_each_online_cpu(i) {
477		struct cpu *p = kzalloc(sizeof(*p), GFP_KERNEL);
478		if (!p)
479			err = -ENOMEM;
480		else
481			register_cpu(p, i);
482	}
483
484	return err;
485}
486
487subsys_initcall(topology_init);
488