xref: /openbmc/linux/arch/xtensa/kernel/setup.c (revision 05bcf503) 
1 /*
2  * arch/xtensa/kernel/setup.c
3  *
4  * This file is subject to the terms and conditions of the GNU General Public
5  * License.  See the file "COPYING" in the main directory of this archive
6  * for more details.
7  *
8  * Copyright (C) 1995  Linus Torvalds
9  * Copyright (C) 2001 - 2005  Tensilica Inc.
10  *
11  * Chris Zankel	<chris@zankel.net>
12  * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
13  * Kevin Chea
14  * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
15  */
16 
17 #include <linux/errno.h>
18 #include <linux/init.h>
19 #include <linux/mm.h>
20 #include <linux/proc_fs.h>
21 #include <linux/screen_info.h>
22 #include <linux/bootmem.h>
23 #include <linux/kernel.h>
24 
25 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
26 # include <linux/console.h>
27 #endif
28 
29 #ifdef CONFIG_RTC
30 # include <linux/timex.h>
31 #endif
32 
33 #ifdef CONFIG_PROC_FS
34 # include <linux/seq_file.h>
35 #endif
36 
37 #include <asm/bootparam.h>
38 #include <asm/pgtable.h>
39 #include <asm/processor.h>
40 #include <asm/timex.h>
41 #include <asm/platform.h>
42 #include <asm/page.h>
43 #include <asm/setup.h>
44 #include <asm/param.h>
45 
46 #include <platform/hardware.h>
47 
48 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
49 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
50 #endif
51 
52 #ifdef CONFIG_BLK_DEV_FD
53 extern struct fd_ops no_fd_ops;
54 struct fd_ops *fd_ops;
55 #endif
56 
57 extern struct rtc_ops no_rtc_ops;
58 struct rtc_ops *rtc_ops;
59 
60 #ifdef CONFIG_BLK_DEV_INITRD
61 extern void *initrd_start;
62 extern void *initrd_end;
63 int initrd_is_mapped = 0;
64 extern int initrd_below_start_ok;
65 #endif
66 
67 unsigned char aux_device_present;
68 extern unsigned long loops_per_jiffy;
69 
70 /* Command line specified as configuration option. */
71 
72 static char __initdata command_line[COMMAND_LINE_SIZE];
73 
74 #ifdef CONFIG_CMDLINE_BOOL
75 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
76 #endif
77 
78 sysmem_info_t __initdata sysmem;
79 
80 #ifdef CONFIG_MMU
81 extern void init_mmu(void);
82 #else
83 static inline void init_mmu(void) { }
84 #endif
85 
86 extern void zones_init(void);
87 
88 /*
89  * Boot parameter parsing.
90  *
91  * The Xtensa port uses a list of variable-sized tags to pass data to
92  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
93  * to be recognised. The list is terminated with a zero-sized
94  * BP_TAG_LAST tag.
95  */
96 
97 typedef struct tagtable {
98 	u32 tag;
99 	int (*parse)(const bp_tag_t*);
100 } tagtable_t;
101 
102 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn 		\
103 	__attribute__((used, section(".taglist"))) = { tag, fn }
104 
105 /* parse current tag */
106 
107 static int __init parse_tag_mem(const bp_tag_t *tag)
108 {
109 	meminfo_t *mi = (meminfo_t*)(tag->data);
110 
111 	if (mi->type != MEMORY_TYPE_CONVENTIONAL)
112 		return -1;
113 
114 	if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
115 		printk(KERN_WARNING
116 		       "Ignoring memory bank 0x%08lx size %ldKB\n",
117 		       (unsigned long)mi->start,
118 		       (unsigned long)mi->end - (unsigned long)mi->start);
119 		return -EINVAL;
120 	}
121 	sysmem.bank[sysmem.nr_banks].type  = mi->type;
122 	sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(mi->start);
123 	sysmem.bank[sysmem.nr_banks].end   = mi->end & PAGE_MASK;
124 	sysmem.nr_banks++;
125 
126 	return 0;
127 }
128 
129 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
130 
131 #ifdef CONFIG_BLK_DEV_INITRD
132 
133 static int __init parse_tag_initrd(const bp_tag_t* tag)
134 {
135 	meminfo_t* mi;
136 	mi = (meminfo_t*)(tag->data);
137 	initrd_start = (void*)(mi->start);
138 	initrd_end = (void*)(mi->end);
139 
140 	return 0;
141 }
142 
143 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
144 
145 #endif /* CONFIG_BLK_DEV_INITRD */
146 
147 static int __init parse_tag_cmdline(const bp_tag_t* tag)
148 {
149 	strncpy(command_line, (char*)(tag->data), COMMAND_LINE_SIZE);
150 	command_line[COMMAND_LINE_SIZE - 1] = '\0';
151 	return 0;
152 }
153 
154 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
155 
156 static int __init parse_bootparam(const bp_tag_t* tag)
157 {
158 	extern tagtable_t __tagtable_begin, __tagtable_end;
159 	tagtable_t *t;
160 
161 	/* Boot parameters must start with a BP_TAG_FIRST tag. */
162 
163 	if (tag->id != BP_TAG_FIRST) {
164 		printk(KERN_WARNING "Invalid boot parameters!\n");
165 		return 0;
166 	}
167 
168 	tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
169 
170 	/* Parse all tags. */
171 
172 	while (tag != NULL && tag->id != BP_TAG_LAST) {
173 	 	for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
174 			if (tag->id == t->tag) {
175 				t->parse(tag);
176 				break;
177 			}
178 		}
179 		if (t == &__tagtable_end)
180 			printk(KERN_WARNING "Ignoring tag "
181 			       "0x%08x\n", tag->id);
182 		tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
183 	}
184 
185 	return 0;
186 }
187 
188 /*
189  * Initialize architecture. (Early stage)
190  */
191 
192 void __init init_arch(bp_tag_t *bp_start)
193 {
194 	sysmem.nr_banks = 0;
195 
196 #ifdef CONFIG_CMDLINE_BOOL
197 	strcpy(command_line, default_command_line);
198 #endif
199 
200 	/* Parse boot parameters */
201 
202         if (bp_start)
203 	  parse_bootparam(bp_start);
204 
205 	if (sysmem.nr_banks == 0) {
206 		sysmem.nr_banks = 1;
207 		sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
208 		sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
209 				     + PLATFORM_DEFAULT_MEM_SIZE;
210 	}
211 
212 	/* Early hook for platforms */
213 
214 	platform_init(bp_start);
215 
216 	/* Initialize MMU. */
217 
218 	init_mmu();
219 }
220 
221 /*
222  * Initialize system. Setup memory and reserve regions.
223  */
224 
225 extern char _end;
226 extern char _stext;
227 extern char _WindowVectors_text_start;
228 extern char _WindowVectors_text_end;
229 extern char _DebugInterruptVector_literal_start;
230 extern char _DebugInterruptVector_text_end;
231 extern char _KernelExceptionVector_literal_start;
232 extern char _KernelExceptionVector_text_end;
233 extern char _UserExceptionVector_literal_start;
234 extern char _UserExceptionVector_text_end;
235 extern char _DoubleExceptionVector_literal_start;
236 extern char _DoubleExceptionVector_text_end;
237 
238 void __init setup_arch(char **cmdline_p)
239 {
240 	extern int mem_reserve(unsigned long, unsigned long, int);
241 	extern void bootmem_init(void);
242 
243 	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
244 	boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
245 	*cmdline_p = command_line;
246 
247 	/* Reserve some memory regions */
248 
249 #ifdef CONFIG_BLK_DEV_INITRD
250 	if (initrd_start < initrd_end) {
251 		initrd_is_mapped = mem_reserve(__pa(initrd_start),
252 					       __pa(initrd_end), 0);
253 		initrd_below_start_ok = 1;
254  	} else {
255 		initrd_start = 0;
256 	}
257 #endif
258 
259 	mem_reserve(__pa(&_stext),__pa(&_end), 1);
260 
261 	mem_reserve(__pa(&_WindowVectors_text_start),
262 		    __pa(&_WindowVectors_text_end), 0);
263 
264 	mem_reserve(__pa(&_DebugInterruptVector_literal_start),
265 		    __pa(&_DebugInterruptVector_text_end), 0);
266 
267 	mem_reserve(__pa(&_KernelExceptionVector_literal_start),
268 		    __pa(&_KernelExceptionVector_text_end), 0);
269 
270 	mem_reserve(__pa(&_UserExceptionVector_literal_start),
271 		    __pa(&_UserExceptionVector_text_end), 0);
272 
273 	mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
274 		    __pa(&_DoubleExceptionVector_text_end), 0);
275 
276 	bootmem_init();
277 
278 	platform_setup(cmdline_p);
279 
280 
281 	paging_init();
282 	zones_init();
283 
284 #ifdef CONFIG_VT
285 # if defined(CONFIG_VGA_CONSOLE)
286 	conswitchp = &vga_con;
287 # elif defined(CONFIG_DUMMY_CONSOLE)
288 	conswitchp = &dummy_con;
289 # endif
290 #endif
291 
292 #ifdef CONFIG_PCI
293 	platform_pcibios_init();
294 #endif
295 }
296 
297 void machine_restart(char * cmd)
298 {
299 	platform_restart();
300 }
301 
302 void machine_halt(void)
303 {
304 	platform_halt();
305 	while (1);
306 }
307 
308 void machine_power_off(void)
309 {
310 	platform_power_off();
311 	while (1);
312 }
313 #ifdef CONFIG_PROC_FS
314 
315 /*
316  * Display some core information through /proc/cpuinfo.
317  */
318 
319 static int
320 c_show(struct seq_file *f, void *slot)
321 {
322 	/* high-level stuff */
323 	seq_printf(f,"processor\t: 0\n"
324 		     "vendor_id\t: Tensilica\n"
325 		     "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
326 		     "core ID\t\t: " XCHAL_CORE_ID "\n"
327 		     "build ID\t: 0x%x\n"
328 		     "byte order\t: %s\n"
329  		     "cpu MHz\t\t: %lu.%02lu\n"
330 		     "bogomips\t: %lu.%02lu\n",
331 		     XCHAL_BUILD_UNIQUE_ID,
332 		     XCHAL_HAVE_BE ?  "big" : "little",
333 		     CCOUNT_PER_JIFFY/(1000000/HZ),
334 		     (CCOUNT_PER_JIFFY/(10000/HZ)) % 100,
335 		     loops_per_jiffy/(500000/HZ),
336 		     (loops_per_jiffy/(5000/HZ)) % 100);
337 
338 	seq_printf(f,"flags\t\t: "
339 #if XCHAL_HAVE_NMI
340 		     "nmi "
341 #endif
342 #if XCHAL_HAVE_DEBUG
343 		     "debug "
344 # if XCHAL_HAVE_OCD
345 		     "ocd "
346 # endif
347 #endif
348 #if XCHAL_HAVE_DENSITY
349 	    	     "density "
350 #endif
351 #if XCHAL_HAVE_BOOLEANS
352 		     "boolean "
353 #endif
354 #if XCHAL_HAVE_LOOPS
355 		     "loop "
356 #endif
357 #if XCHAL_HAVE_NSA
358 		     "nsa "
359 #endif
360 #if XCHAL_HAVE_MINMAX
361 		     "minmax "
362 #endif
363 #if XCHAL_HAVE_SEXT
364 		     "sext "
365 #endif
366 #if XCHAL_HAVE_CLAMPS
367 		     "clamps "
368 #endif
369 #if XCHAL_HAVE_MAC16
370 		     "mac16 "
371 #endif
372 #if XCHAL_HAVE_MUL16
373 		     "mul16 "
374 #endif
375 #if XCHAL_HAVE_MUL32
376 		     "mul32 "
377 #endif
378 #if XCHAL_HAVE_MUL32_HIGH
379 		     "mul32h "
380 #endif
381 #if XCHAL_HAVE_FP
382 		     "fpu "
383 #endif
384 		     "\n");
385 
386 	/* Registers. */
387 	seq_printf(f,"physical aregs\t: %d\n"
388 		     "misc regs\t: %d\n"
389 		     "ibreak\t\t: %d\n"
390 		     "dbreak\t\t: %d\n",
391 		     XCHAL_NUM_AREGS,
392 		     XCHAL_NUM_MISC_REGS,
393 		     XCHAL_NUM_IBREAK,
394 		     XCHAL_NUM_DBREAK);
395 
396 
397 	/* Interrupt. */
398 	seq_printf(f,"num ints\t: %d\n"
399 		     "ext ints\t: %d\n"
400 		     "int levels\t: %d\n"
401 		     "timers\t\t: %d\n"
402 		     "debug level\t: %d\n",
403 		     XCHAL_NUM_INTERRUPTS,
404 		     XCHAL_NUM_EXTINTERRUPTS,
405 		     XCHAL_NUM_INTLEVELS,
406 		     XCHAL_NUM_TIMERS,
407 		     XCHAL_DEBUGLEVEL);
408 
409 	/* Cache */
410 	seq_printf(f,"icache line size: %d\n"
411 		     "icache ways\t: %d\n"
412 		     "icache size\t: %d\n"
413 		     "icache flags\t: "
414 #if XCHAL_ICACHE_LINE_LOCKABLE
415 		     "lock"
416 #endif
417 		     "\n"
418 		     "dcache line size: %d\n"
419 		     "dcache ways\t: %d\n"
420 		     "dcache size\t: %d\n"
421 		     "dcache flags\t: "
422 #if XCHAL_DCACHE_IS_WRITEBACK
423 		     "writeback"
424 #endif
425 #if XCHAL_DCACHE_LINE_LOCKABLE
426 		     "lock"
427 #endif
428 		     "\n",
429 		     XCHAL_ICACHE_LINESIZE,
430 		     XCHAL_ICACHE_WAYS,
431 		     XCHAL_ICACHE_SIZE,
432 		     XCHAL_DCACHE_LINESIZE,
433 		     XCHAL_DCACHE_WAYS,
434 		     XCHAL_DCACHE_SIZE);
435 
436 	return 0;
437 }
438 
439 /*
440  * We show only CPU #0 info.
441  */
442 static void *
443 c_start(struct seq_file *f, loff_t *pos)
444 {
445 	return (void *) ((*pos == 0) ? (void *)1 : NULL);
446 }
447 
448 static void *
449 c_next(struct seq_file *f, void *v, loff_t *pos)
450 {
451 	return NULL;
452 }
453 
454 static void
455 c_stop(struct seq_file *f, void *v)
456 {
457 }
458 
459 const struct seq_operations cpuinfo_op =
460 {
461 	start:  c_start,
462 	next:   c_next,
463 	stop:   c_stop,
464 	show:   c_show
465 };
466 
467 #endif /* CONFIG_PROC_FS */
468 
469