summaryrefslogtreecommitdiff
path: root/arch/c6x/kernel/setup.c
blob: 72e17f7ebd6ff0fba193ac07190d42b41e106e76 (plain)
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
/*
 *  Port on Texas Instruments TMS320C6x architecture
 *
 *  Copyright (C) 2004, 2006, 2009, 2010, 2011 Texas Instruments Incorporated
 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 */
#include <linux/dma-mapping.h>
#include <linux/memblock.h>
#include <linux/seq_file.h>
#include <linux/bootmem.h>
#include <linux/clkdev.h>
#include <linux/initrd.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_fdt.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/cache.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/clk.h>
#include <linux/cpu.h>
#include <linux/fs.h>
#include <linux/of.h>
#include <linux/console.h>
#include <linux/screen_info.h>

#include <asm/sections.h>
#include <asm/div64.h>
#include <asm/setup.h>
#include <asm/dscr.h>
#include <asm/clock.h>
#include <asm/soc.h>
#include <asm/special_insns.h>

static const char *c6x_soc_name;

struct screen_info screen_info;

int c6x_num_cores;
EXPORT_SYMBOL_GPL(c6x_num_cores);

unsigned int c6x_silicon_rev;
EXPORT_SYMBOL_GPL(c6x_silicon_rev);

/*
 * Device status register. This holds information
 * about device configuration needed by some drivers.
 */
unsigned int c6x_devstat;
EXPORT_SYMBOL_GPL(c6x_devstat);

/*
 * Some SoCs have fuse registers holding a unique MAC
 * address. This is parsed out of the device tree with
 * the resulting MAC being held here.
 */
unsigned char c6x_fuse_mac[6];

unsigned long memory_start;
unsigned long memory_end;
EXPORT_SYMBOL(memory_end);

unsigned long ram_start;
unsigned long ram_end;

/* Uncached memory for DMA consistent use (memdma=) */
static unsigned long dma_start __initdata;
static unsigned long dma_size __initdata;

struct cpuinfo_c6x {
	const char *cpu_name;
	const char *cpu_voltage;
	const char *mmu;
	const char *fpu;
	char *cpu_rev;
	unsigned int core_id;
	char __cpu_rev[5];
};

static DEFINE_PER_CPU(struct cpuinfo_c6x, cpu_data);

unsigned int ticks_per_ns_scaled;
EXPORT_SYMBOL(ticks_per_ns_scaled);

unsigned int c6x_core_freq;

static void __init get_cpuinfo(void)
{
	unsigned cpu_id, rev_id, csr;
	struct clk *coreclk = clk_get_sys(NULL, "core");
	unsigned long core_khz;
	u64 tmp;
	struct cpuinfo_c6x *p;
	struct device_node *node, *np;

	p = &per_cpu(cpu_data, smp_processor_id());

	if (!IS_ERR(coreclk))
		c6x_core_freq = clk_get_rate(coreclk);
	else {
		printk(KERN_WARNING
		       "Cannot find core clock frequency. Using 700MHz\n");
		c6x_core_freq = 700000000;
	}

	core_khz = c6x_core_freq / 1000;

	tmp = (uint64_t)core_khz << C6X_NDELAY_SCALE;
	do_div(tmp, 1000000);
	ticks_per_ns_scaled = tmp;

	csr = get_creg(CSR);
	cpu_id = csr >> 24;
	rev_id = (csr >> 16) & 0xff;

	p->mmu = "none";
	p->fpu = "none";
	p->cpu_voltage = "unknown";

	switch (cpu_id) {
	case 0:
		p->cpu_name = "C67x";
		p->fpu = "yes";
		break;
	case 2:
		p->cpu_name = "C62x";
		break;
	case 8:
		p->cpu_name = "C64x";
		break;
	case 12:
		p->cpu_name = "C64x";
		break;
	case 16:
		p->cpu_name = "C64x+";
		p->cpu_voltage = "1.2";
		break;
	case 21:
		p->cpu_name = "C66X";
		p->cpu_voltage = "1.2";
		break;
	default:
		p->cpu_name = "unknown";
		break;
	}

	if (cpu_id < 16) {
		switch (rev_id) {
		case 0x1:
			if (cpu_id > 8) {
				p->cpu_rev = "DM640/DM641/DM642/DM643";
				p->cpu_voltage = "1.2 - 1.4";
			} else {
				p->cpu_rev = "C6201";
				p->cpu_voltage = "2.5";
			}
			break;
		case 0x2:
			p->cpu_rev = "C6201B/C6202/C6211";
			p->cpu_voltage = "1.8";
			break;
		case 0x3:
			p->cpu_rev = "C6202B/C6203/C6204/C6205";
			p->cpu_voltage = "1.5";
			break;
		case 0x201:
			p->cpu_rev = "C6701 revision 0 (early CPU)";
			p->cpu_voltage = "1.8";
			break;
		case 0x202:
			p->cpu_rev = "C6701/C6711/C6712";
			p->cpu_voltage = "1.8";
			break;
		case 0x801:
			p->cpu_rev = "C64x";
			p->cpu_voltage = "1.5";
			break;
		default:
			p->cpu_rev = "unknown";
		}
	} else {
		p->cpu_rev = p->__cpu_rev;
		snprintf(p->__cpu_rev, sizeof(p->__cpu_rev), "0x%x", cpu_id);
	}

	p->core_id = get_coreid();

	node = of_find_node_by_name(NULL, "cpus");
	if (node) {
		for_each_child_of_node(node, np)
			if (!strcmp("cpu", np->name))
				++c6x_num_cores;
		of_node_put(node);
	}

	node = of_find_node_by_name(NULL, "soc");
	if (node) {
		if (of_property_read_string(node, "model", &c6x_soc_name))
			c6x_soc_name = "unknown";
		of_node_put(node);
	} else
		c6x_soc_name = "unknown";

	printk(KERN_INFO "CPU%d: %s rev %s, %s volts, %uMHz\n",
	       p->core_id, p->cpu_name, p->cpu_rev,
	       p->cpu_voltage, c6x_core_freq / 1000000);
}

/*
 * Early parsing of the command line
 */
static u32 mem_size __initdata;

/* "mem=" parsing. */
static int __init early_mem(char *p)
{
	if (!p)
		return -EINVAL;

	mem_size = memparse(p, &p);
	/* don't remove all of memory when handling "mem={invalid}" */
	if (mem_size == 0)
		return -EINVAL;

	return 0;
}
early_param("mem", early_mem);

/* "memdma=<size>[@<address>]" parsing. */
static int __init early_memdma(char *p)
{
	if (!p)
		return -EINVAL;

	dma_size = memparse(p, &p);
	if (*p == '@')
		dma_start = memparse(p, &p);

	return 0;
}
early_param("memdma", early_memdma);

int __init c6x_add_memory(phys_addr_t start, unsigned long size)
{
	static int ram_found __initdata;

	/* We only handle one bank (the one with PAGE_OFFSET) for now */
	if (ram_found)
		return -EINVAL;

	if (start > PAGE_OFFSET || PAGE_OFFSET >= (start + size))
		return 0;

	ram_start = start;
	ram_end = start + size;

	ram_found = 1;
	return 0;
}

/*
 * Do early machine setup and device tree parsing. This is called very
 * early on the boot process.
 */
notrace void __init machine_init(unsigned long dt_ptr)
{
	void *dtb = __va(dt_ptr);
	void *fdt = _fdt_start;

	/* interrupts must be masked */
	set_creg(IER, 2);

	/*
	 * Set the Interrupt Service Table (IST) to the beginning of the
	 * vector table.
	 */
	set_ist(_vectors_start);

	lockdep_init();

	/*
	 * dtb is passed in from bootloader.
	 * fdt is linked in blob.
	 */
	if (dtb && dtb != fdt)
		fdt = dtb;

	/* Do some early initialization based on the flat device tree */
	early_init_dt_scan(fdt);

	parse_early_param();
}

void __init setup_arch(char **cmdline_p)
{
	int bootmap_size;
	struct memblock_region *reg;

	printk(KERN_INFO "Initializing kernel\n");

	/* Initialize command line */
	*cmdline_p = boot_command_line;

	memory_end = ram_end;
	memory_end &= ~(PAGE_SIZE - 1);

	if (mem_size && (PAGE_OFFSET + PAGE_ALIGN(mem_size)) < memory_end)
		memory_end = PAGE_OFFSET + PAGE_ALIGN(mem_size);

	/* add block that this kernel can use */
	memblock_add(PAGE_OFFSET, memory_end - PAGE_OFFSET);

	/* reserve kernel text/data/bss */
	memblock_reserve(PAGE_OFFSET,
			 PAGE_ALIGN((unsigned long)&_end - PAGE_OFFSET));

	if (dma_size) {
		/* align to cacheability granularity */
		dma_size = CACHE_REGION_END(dma_size);

		if (!dma_start)
			dma_start = memory_end - dma_size;

		/* align to cacheability granularity */
		dma_start = CACHE_REGION_START(dma_start);

		/* reserve DMA memory taken from kernel memory */
		if (memblock_is_region_memory(dma_start, dma_size))
			memblock_reserve(dma_start, dma_size);
	}

	memory_start = PAGE_ALIGN((unsigned int) &_end);

	printk(KERN_INFO "Memory Start=%08lx, Memory End=%08lx\n",
	       memory_start, memory_end);

#ifdef CONFIG_BLK_DEV_INITRD
	/*
	 * Reserve initrd memory if in kernel memory.
	 */
	if (initrd_start < initrd_end)
		if (memblock_is_region_memory(initrd_start,
					      initrd_end - initrd_start))
			memblock_reserve(initrd_start,
					 initrd_end - initrd_start);
#endif

	init_mm.start_code = (unsigned long) &_stext;
	init_mm.end_code   = (unsigned long) &_etext;
	init_mm.end_data   = memory_start;
	init_mm.brk        = memory_start;

	/*
	 * Give all the memory to the bootmap allocator,  tell it to put the
	 * boot mem_map at the start of memory
	 */
	bootmap_size = init_bootmem_node(NODE_DATA(0),
					 memory_start >> PAGE_SHIFT,
					 PAGE_OFFSET >> PAGE_SHIFT,
					 memory_end >> PAGE_SHIFT);
	memblock_reserve(memory_start, bootmap_size);

	unflatten_device_tree();

	c6x_cache_init();

	/* Set the whole external memory as non-cacheable */
	disable_caching(ram_start, ram_end - 1);

	/* Set caching of external RAM used by Linux */
	for_each_memblock(memory, reg)
		enable_caching(CACHE_REGION_START(reg->base),
			       CACHE_REGION_START(reg->base + reg->size - 1));

#ifdef CONFIG_BLK_DEV_INITRD
	/*
	 * Enable caching for initrd which falls outside kernel memory.
	 */
	if (initrd_start < initrd_end) {
		if (!memblock_is_region_memory(initrd_start,
					       initrd_end - initrd_start))
			enable_caching(CACHE_REGION_START(initrd_start),
				       CACHE_REGION_START(initrd_end - 1));
	}
#endif

	/*
	 * Disable caching for dma coherent memory taken from kernel memory.
	 */
	if (dma_size && memblock_is_region_memory(dma_start, dma_size))
		disable_caching(dma_start,
				CACHE_REGION_START(dma_start + dma_size - 1));

	/* Initialize the coherent memory allocator */
	coherent_mem_init(dma_start, dma_size);

	/*
	 * Free all memory as a starting point.
	 */
	free_bootmem(PAGE_OFFSET, memory_end - PAGE_OFFSET);

	/*
	 * Then reserve memory which is already being used.
	 */
	for_each_memblock(reserved, reg) {
		pr_debug("reserved - 0x%08x-0x%08x\n",
			 (u32) reg->base, (u32) reg->size);
		reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
	}

	max_low_pfn = PFN_DOWN(memory_end);
	min_low_pfn = PFN_UP(memory_start);
	max_mapnr = max_low_pfn - min_low_pfn;

	/* Get kmalloc into gear */
	paging_init();

	/*
	 * Probe for Device State Configuration Registers.
	 * We have to do this early in case timer needs to be enabled
	 * through DSCR.
	 */
	dscr_probe();

	/* We do this early for timer and core clock frequency */
	c64x_setup_clocks();

	/* Get CPU info */
	get_cpuinfo();

#if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
	conswitchp = &dummy_con;
#endif
}

#define cpu_to_ptr(n) ((void *)((long)(n)+1))
#define ptr_to_cpu(p) ((long)(p) - 1)

static int show_cpuinfo(struct seq_file *m, void *v)
{
	int n = ptr_to_cpu(v);
	struct cpuinfo_c6x *p = &per_cpu(cpu_data, n);

	if (n == 0) {
		seq_printf(m,
			   "soc\t\t: %s\n"
			   "soc revision\t: 0x%x\n"
			   "soc cores\t: %d\n",
			   c6x_soc_name, c6x_silicon_rev, c6x_num_cores);
	}

	seq_printf(m,
		   "\n"
		   "processor\t: %d\n"
		   "cpu\t\t: %s\n"
		   "core revision\t: %s\n"
		   "core voltage\t: %s\n"
		   "core id\t\t: %d\n"
		   "mmu\t\t: %s\n"
		   "fpu\t\t: %s\n"
		   "cpu MHz\t\t: %u\n"
		   "bogomips\t: %lu.%02lu\n\n",
		   n,
		   p->cpu_name, p->cpu_rev, p->cpu_voltage,
		   p->core_id, p->mmu, p->fpu,
		   (c6x_core_freq + 500000) / 1000000,
		   (loops_per_jiffy/(500000/HZ)),
		   (loops_per_jiffy/(5000/HZ))%100);

	return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
	return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
}
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return NULL;
}
static void c_stop(struct seq_file *m, void *v)
{
}

const struct seq_operations cpuinfo_op = {
	c_start,
	c_stop,
	c_next,
	show_cpuinfo
};

static struct cpu cpu_devices[NR_CPUS];

static int __init topology_init(void)
{
	int i;

	for_each_present_cpu(i)
		register_cpu(&cpu_devices[i], i);

	return 0;
}

subsys_initcall(topology_init);