Free Electrons

Embedded Linux Experts

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
/*
 * Common prep boot and setup code.
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/ide.h>
#include <linux/screen_info.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/console.h>

#include <asm/residual.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#include <asm/setup.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/cputable.h>
#include <asm/bootx.h>
#include <asm/btext.h>
#include <asm/machdep.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/nvram.h>
#include <asm/xmon.h>
#include <asm/ocp.h>
#include <asm/prom.h>

#define USES_PPC_SYS (defined(CONFIG_85xx) || defined(CONFIG_83xx) || \
		      defined(CONFIG_MPC10X_BRIDGE) || defined(CONFIG_8260) || \
		      defined(CONFIG_PPC_MPC52xx))

#if USES_PPC_SYS
#include <asm/ppc_sys.h>
#endif

#if defined CONFIG_KGDB
#include <asm/kgdb.h>
#endif

extern void platform_init(unsigned long r3, unsigned long r4,
		unsigned long r5, unsigned long r6, unsigned long r7);
extern void reloc_got2(unsigned long offset);

extern void ppc6xx_idle(void);
extern void power4_idle(void);

extern boot_infos_t *boot_infos;
struct ide_machdep_calls ppc_ide_md;

/* Used with the BI_MEMSIZE bootinfo parameter to store the memory
   size value reported by the boot loader. */
unsigned long boot_mem_size;

unsigned long ISA_DMA_THRESHOLD;
unsigned int DMA_MODE_READ;
unsigned int DMA_MODE_WRITE;

#ifdef CONFIG_PPC_PREP
extern void prep_init(unsigned long r3, unsigned long r4,
		unsigned long r5, unsigned long r6, unsigned long r7);

dev_t boot_dev;
#endif /* CONFIG_PPC_PREP */

int have_of;
EXPORT_SYMBOL(have_of);

#ifdef __DO_IRQ_CANON
int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#endif

#ifdef CONFIG_VGA_CONSOLE
unsigned long vgacon_remap_base;
#endif

struct machdep_calls ppc_md;

/*
 * These are used in binfmt_elf.c to put aux entries on the stack
 * for each elf executable being started.
 */
int dcache_bsize;
int icache_bsize;
int ucache_bsize;

#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
    defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
struct screen_info screen_info = {
	0, 25,			/* orig-x, orig-y */
	0,			/* unused */
	0,			/* orig-video-page */
	0,			/* orig-video-mode */
	80,			/* orig-video-cols */
	0,0,0,			/* ega_ax, ega_bx, ega_cx */
	25,			/* orig-video-lines */
	1,			/* orig-video-isVGA */
	16			/* orig-video-points */
};
#endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */

void machine_restart(char *cmd)
{
#ifdef CONFIG_NVRAM
	nvram_sync();
#endif
	ppc_md.restart(cmd);
}

static void ppc_generic_power_off(void)
{
	ppc_md.power_off();
}

void machine_halt(void)
{
#ifdef CONFIG_NVRAM
	nvram_sync();
#endif
	ppc_md.halt();
}

void (*pm_power_off)(void) = ppc_generic_power_off;

void machine_power_off(void)
{
#ifdef CONFIG_NVRAM
	nvram_sync();
#endif
	if (pm_power_off)
		pm_power_off();
	ppc_generic_power_off();
}

#ifdef CONFIG_TAU
extern u32 cpu_temp(unsigned long cpu);
extern u32 cpu_temp_both(unsigned long cpu);
#endif /* CONFIG_TAU */

int show_cpuinfo(struct seq_file *m, void *v)
{
	int i = (int) v - 1;
	int err = 0;
	unsigned int pvr;
	unsigned short maj, min;
	unsigned long lpj;

	if (i >= NR_CPUS) {
		/* Show summary information */
#ifdef CONFIG_SMP
		unsigned long bogosum = 0;
		for_each_online_cpu(i)
			bogosum += cpu_data[i].loops_per_jiffy;
		seq_printf(m, "total bogomips\t: %lu.%02lu\n",
			   bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
#endif /* CONFIG_SMP */

		if (ppc_md.show_cpuinfo != NULL)
			err = ppc_md.show_cpuinfo(m);
		return err;
	}

#ifdef CONFIG_SMP
	if (!cpu_online(i))
		return 0;
	pvr = cpu_data[i].pvr;
	lpj = cpu_data[i].loops_per_jiffy;
#else
	pvr = mfspr(SPRN_PVR);
	lpj = loops_per_jiffy;
#endif

	seq_printf(m, "processor\t: %d\n", i);
	seq_printf(m, "cpu\t\t: ");

	if (cur_cpu_spec->pvr_mask)
		seq_printf(m, "%s", cur_cpu_spec->cpu_name);
	else
		seq_printf(m, "unknown (%08x)", pvr);
#ifdef CONFIG_ALTIVEC
	if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
		seq_printf(m, ", altivec supported");
#endif
	seq_printf(m, "\n");

#ifdef CONFIG_TAU
	if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
#ifdef CONFIG_TAU_AVERAGE
		/* more straightforward, but potentially misleading */
		seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
			   cpu_temp(i));
#else
		/* show the actual temp sensor range */
		u32 temp;
		temp = cpu_temp_both(i);
		seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
			   temp & 0xff, temp >> 16);
#endif
	}
#endif /* CONFIG_TAU */

	if (ppc_md.show_percpuinfo != NULL) {
		err = ppc_md.show_percpuinfo(m, i);
		if (err)
			return err;
	}

	/* If we are a Freescale core do a simple check so
	 * we dont have to keep adding cases in the future */
	if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
		maj = PVR_MAJ(pvr);
		min = PVR_MIN(pvr);
	} else {
		switch (PVR_VER(pvr)) {
			case 0x0020:	/* 403 family */
				maj = PVR_MAJ(pvr) + 1;
				min = PVR_MIN(pvr);
				break;
			case 0x1008:	/* 740P/750P ?? */
				maj = ((pvr >> 8) & 0xFF) - 1;
				min = pvr & 0xFF;
				break;
			default:
				maj = (pvr >> 8) & 0xFF;
				min = pvr & 0xFF;
				break;
		}
	}

	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
		   maj, min, PVR_VER(pvr), PVR_REV(pvr));

	seq_printf(m, "bogomips\t: %lu.%02lu\n",
		   lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);

#if USES_PPC_SYS
	if (cur_ppc_sys_spec->ppc_sys_name)
		seq_printf(m, "chipset\t\t: %s\n",
			cur_ppc_sys_spec->ppc_sys_name);
#endif

#ifdef CONFIG_SMP
	seq_printf(m, "\n");
#endif

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	int i = *pos;

	return i <= NR_CPUS? (void *) (i + 1): NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
	.start =c_start,
	.next =	c_next,
	.stop =	c_stop,
	.show =	show_cpuinfo,
};

/*
 * We're called here very early in the boot.  We determine the machine
 * type and call the appropriate low-level setup functions.
 *  -- Cort <cort@fsmlabs.com>
 *
 * Note that the kernel may be running at an address which is different
 * from the address that it was linked at, so we must use RELOC/PTRRELOC
 * to access static data (including strings).  -- paulus
 */
__init
unsigned long
early_init(int r3, int r4, int r5)
{
 	unsigned long phys;
	unsigned long offset = reloc_offset();
	struct cpu_spec *spec;

 	/* Default */
 	phys = offset + KERNELBASE;

	/* First zero the BSS -- use memset, some arches don't have
	 * caches on yet */
	memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);

	/*
	 * Identify the CPU type and fix up code sections
	 * that depend on which cpu we have.
	 */
#if defined(CONFIG_440EP) && defined(CONFIG_PPC_FPU)
	/* We pass the virtual PVR here for 440EP as 440EP and 440GR have
	 * identical PVRs and there is no reliable way to check for the FPU
	 */
	spec = identify_cpu(offset, (mfspr(SPRN_PVR) | 0x8));
#else
	spec = identify_cpu(offset, mfspr(SPRN_PVR));
#endif
	do_feature_fixups(spec->cpu_features,
			  PTRRELOC(&__start___ftr_fixup),
			  PTRRELOC(&__stop___ftr_fixup));

	return phys;
}

#ifdef CONFIG_PPC_PREP
/*
 * The PPC_PREP version of platform_init...
 */
void __init
platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
	      unsigned long r6, unsigned long r7)
{
#ifdef CONFIG_BOOTX_TEXT
	if (boot_text_mapped) {
		btext_clearscreen();
		btext_welcome();
	}
#endif

	parse_bootinfo(find_bootinfo());

	prep_init(r3, r4, r5, r6, r7);
}
#endif /* CONFIG_PPC_PREP */

struct bi_record *find_bootinfo(void)
{
	struct bi_record *rec;

	rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
	if ( rec->tag != BI_FIRST ) {
		/*
		 * This 0x10000 offset is a terrible hack but it will go away when
		 * we have the bootloader handle all the relocation and
		 * prom calls -- Cort
		 */
		rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
		if ( rec->tag != BI_FIRST )
			return NULL;
	}
	return rec;
}

void parse_bootinfo(struct bi_record *rec)
{
	if (rec == NULL || rec->tag != BI_FIRST)
		return;
	while (rec->tag != BI_LAST) {
		ulong *data = rec->data;
		switch (rec->tag) {
		case BI_CMD_LINE:
			strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
			break;
#ifdef CONFIG_BLK_DEV_INITRD
		case BI_INITRD:
			initrd_start = data[0] + KERNELBASE;
			initrd_end = data[0] + data[1] + KERNELBASE;
			break;
#endif /* CONFIG_BLK_DEV_INITRD */
		case BI_MEMSIZE:
			boot_mem_size = data[0];
			break;
		}
		rec = (struct bi_record *)((ulong)rec + rec->size);
	}
}

/*
 * Find out what kind of machine we're on and save any data we need
 * from the early boot process (devtree is copied on pmac by prom_init()).
 * This is called very early on the boot process, after a minimal
 * MMU environment has been set up but before MMU_init is called.
 */
void __init
machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
	     unsigned long r6, unsigned long r7)
{
#ifdef CONFIG_CMDLINE
	strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
#endif /* CONFIG_CMDLINE */

#ifdef CONFIG_6xx
	ppc_md.power_save = ppc6xx_idle;
#endif

	platform_init(r3, r4, r5, r6, r7);

	if (ppc_md.progress)
		ppc_md.progress("id mach(): done", 0x200);
}
#ifdef CONFIG_BOOKE_WDT
/* Checks wdt=x and wdt_period=xx command-line option */
int __init early_parse_wdt(char *p)
{
	if (p && strncmp(p, "0", 1) != 0)
	       booke_wdt_enabled = 1;

	return 0;
}
early_param("wdt", early_parse_wdt);

int __init early_parse_wdt_period (char *p)
{
	if (p)
		booke_wdt_period = simple_strtoul(p, NULL, 0);

	return 0;
}
early_param("wdt_period", early_parse_wdt_period);
#endif	/* CONFIG_BOOKE_WDT */

/* Checks "l2cr=xxxx" command-line option */
int __init ppc_setup_l2cr(char *str)
{
	if (cpu_has_feature(CPU_FTR_L2CR)) {
		unsigned long val = simple_strtoul(str, NULL, 0);
		printk(KERN_INFO "l2cr set to %lx\n", val);
		_set_L2CR(0);		/* force invalidate by disable cache */
		_set_L2CR(val);		/* and enable it */
	}
	return 1;
}
__setup("l2cr=", ppc_setup_l2cr);

#ifdef CONFIG_GENERIC_NVRAM

/* Generic nvram hooks used by drivers/char/gen_nvram.c */
unsigned char nvram_read_byte(int addr)
{
	if (ppc_md.nvram_read_val)
		return ppc_md.nvram_read_val(addr);
	return 0xff;
}
EXPORT_SYMBOL(nvram_read_byte);

void nvram_write_byte(unsigned char val, int addr)
{
	if (ppc_md.nvram_write_val)
		ppc_md.nvram_write_val(addr, val);
}
EXPORT_SYMBOL(nvram_write_byte);

void nvram_sync(void)
{
	if (ppc_md.nvram_sync)
		ppc_md.nvram_sync();
}
EXPORT_SYMBOL(nvram_sync);

#endif /* CONFIG_NVRAM */

static struct cpu cpu_devices[NR_CPUS];

int __init ppc_init(void)
{
	int i;

	/* clear the progress line */
	if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);

	/* register CPU devices */
	for_each_possible_cpu(i)
		register_cpu(&cpu_devices[i], i);

	/* call platform init */
	if (ppc_md.init != NULL) {
		ppc_md.init();
	}
	return 0;
}

arch_initcall(ppc_init);

/* Warning, IO base is not yet inited */
void __init setup_arch(char **cmdline_p)
{
	extern char *klimit;
	extern void do_init_bootmem(void);

	/* so udelay does something sensible, assume <= 1000 bogomips */
	loops_per_jiffy = 500000000 / HZ;

	if (ppc_md.init_early)
		ppc_md.init_early();

#ifdef CONFIG_XMON
	xmon_init(1);
	if (strstr(cmd_line, "xmon"))
		xmon(NULL);
#endif /* CONFIG_XMON */
	if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);

#if defined(CONFIG_KGDB)
	if (ppc_md.kgdb_map_scc)
		ppc_md.kgdb_map_scc();
	set_debug_traps();
	if (strstr(cmd_line, "gdb")) {
		if (ppc_md.progress)
			ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
		printk("kgdb breakpoint activated\n");
		breakpoint();
	}
#endif

	/*
	 * Set cache line size based on type of cpu as a default.
	 * Systems with OF can look in the properties on the cpu node(s)
	 * for a possibly more accurate value.
	 */
	if (! cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) {
		dcache_bsize = cur_cpu_spec->dcache_bsize;
		icache_bsize = cur_cpu_spec->icache_bsize;
		ucache_bsize = 0;
	} else
		ucache_bsize = dcache_bsize = icache_bsize
			= cur_cpu_spec->dcache_bsize;

	/* reboot on panic */
	panic_timeout = 180;

	init_mm.start_code = PAGE_OFFSET;
	init_mm.end_code = (unsigned long) _etext;
	init_mm.end_data = (unsigned long) _edata;
	init_mm.brk = (unsigned long) klimit;

	/* Save unparsed command line copy for /proc/cmdline */
	strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
	*cmdline_p = cmd_line;

	parse_early_param();

	/* set up the bootmem stuff with available memory */
	do_init_bootmem();
	if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);

#ifdef CONFIG_PPC_OCP
	/* Initialize OCP device list */
	ocp_early_init();
	if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
#endif

#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#endif

	ppc_md.setup_arch();
	if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);

	paging_init();
}