aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/bcm63xx/cpu.c
blob: 79fe32df5e96c99da07d763e0990e07ee0321260 (plain) (blame)
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
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
 * Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/cpu.h>
#include <asm/cpu.h>
#include <asm/cpu-info.h>
#include <asm/mipsregs.h>
#include <bcm63xx_cpu.h>
#include <bcm63xx_regs.h>
#include <bcm63xx_io.h>
#include <bcm63xx_irq.h>

const unsigned long *bcm63xx_regs_base;
EXPORT_SYMBOL(bcm63xx_regs_base);

const int *bcm63xx_irqs;
EXPORT_SYMBOL(bcm63xx_irqs);

static u16 bcm63xx_cpu_id;
static u8 bcm63xx_cpu_rev;
static unsigned int bcm63xx_cpu_freq;
static unsigned int bcm63xx_memory_size;

static const unsigned long bcm6328_regs_base[] = {
	__GEN_CPU_REGS_TABLE(6328)
};

static const int bcm6328_irqs[] = {
	__GEN_CPU_IRQ_TABLE(6328)
};

static const unsigned long bcm6338_regs_base[] = {
	__GEN_CPU_REGS_TABLE(6338)
};

static const int bcm6338_irqs[] = {
	__GEN_CPU_IRQ_TABLE(6338)
};

static const unsigned long bcm6345_regs_base[] = {
	__GEN_CPU_REGS_TABLE(6345)
};

static const int bcm6345_irqs[] = {
	__GEN_CPU_IRQ_TABLE(6345)
};

static const unsigned long bcm6348_regs_base[] = {
	__GEN_CPU_REGS_TABLE(6348)
};

static const int bcm6348_irqs[] = {
	__GEN_CPU_IRQ_TABLE(6348)

};

static const unsigned long bcm6358_regs_base[] = {
	__GEN_CPU_REGS_TABLE(6358)
};

static const int bcm6358_irqs[] = {
	__GEN_CPU_IRQ_TABLE(6358)

};

static const unsigned long bcm6362_regs_base[] = {
	__GEN_CPU_REGS_TABLE(6362)
};

static const int bcm6362_irqs[] = {
	__GEN_CPU_IRQ_TABLE(6362)

};

static const unsigned long bcm6368_regs_base[] = {
	__GEN_CPU_REGS_TABLE(6368)
};

static const int bcm6368_irqs[] = {
	__GEN_CPU_IRQ_TABLE(6368)

};

u16 __bcm63xx_get_cpu_id(void)
{
	return bcm63xx_cpu_id;
}

EXPORT_SYMBOL(__bcm63xx_get_cpu_id);

u8 bcm63xx_get_cpu_rev(void)
{
	return bcm63xx_cpu_rev;
}

EXPORT_SYMBOL(bcm63xx_get_cpu_rev);

unsigned int bcm63xx_get_cpu_freq(void)
{
	return bcm63xx_cpu_freq;
}

unsigned int bcm63xx_get_memory_size(void)
{
	return bcm63xx_memory_size;
}

static unsigned int detect_cpu_clock(void)
{
	switch (bcm63xx_get_cpu_id()) {
	case BCM6328_CPU_ID:
	{
		unsigned int tmp, mips_pll_fcvo;

		tmp = bcm_misc_readl(MISC_STRAPBUS_6328_REG);
		mips_pll_fcvo = (tmp & STRAPBUS_6328_FCVO_MASK)
				>> STRAPBUS_6328_FCVO_SHIFT;

		switch (mips_pll_fcvo) {
		case 0x12:
		case 0x14:
		case 0x19:
			return 160000000;
		case 0x1c:
			return 192000000;
		case 0x13:
		case 0x15:
			return 200000000;
		case 0x1a:
			return 384000000;
		case 0x16:
			return 400000000;
		default:
			return 320000000;
		}

	}
	case BCM6338_CPU_ID:
		/* BCM6338 has a fixed 240 Mhz frequency */
		return 240000000;

	case BCM6345_CPU_ID:
		/* BCM6345 has a fixed 140Mhz frequency */
		return 140000000;

	case BCM6348_CPU_ID:
	{
		unsigned int tmp, n1, n2, m1;

		/* 16MHz * (N1 + 1) * (N2 + 2) / (M1_CPU + 1) */
		tmp = bcm_perf_readl(PERF_MIPSPLLCTL_REG);
		n1 = (tmp & MIPSPLLCTL_N1_MASK) >> MIPSPLLCTL_N1_SHIFT;
		n2 = (tmp & MIPSPLLCTL_N2_MASK) >> MIPSPLLCTL_N2_SHIFT;
		m1 = (tmp & MIPSPLLCTL_M1CPU_MASK) >> MIPSPLLCTL_M1CPU_SHIFT;
		n1 += 1;
		n2 += 2;
		m1 += 1;
		return (16 * 1000000 * n1 * n2) / m1;
	}

	case BCM6358_CPU_ID:
	{
		unsigned int tmp, n1, n2, m1;

		/* 16MHz * N1 * N2 / M1_CPU */
		tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_REG);
		n1 = (tmp & DMIPSPLLCFG_N1_MASK) >> DMIPSPLLCFG_N1_SHIFT;
		n2 = (tmp & DMIPSPLLCFG_N2_MASK) >> DMIPSPLLCFG_N2_SHIFT;
		m1 = (tmp & DMIPSPLLCFG_M1_MASK) >> DMIPSPLLCFG_M1_SHIFT;
		return (16 * 1000000 * n1 * n2) / m1;
	}

	case BCM6362_CPU_ID:
	{
		unsigned int tmp, mips_pll_fcvo;

		tmp = bcm_misc_readl(MISC_STRAPBUS_6362_REG);
		mips_pll_fcvo = (tmp & STRAPBUS_6362_FCVO_MASK)
				>> STRAPBUS_6362_FCVO_SHIFT;
		switch (mips_pll_fcvo) {
		case 0x03:
		case 0x0b:
		case 0x13:
		case 0x1b:
			return 240000000;
		case 0x04:
		case 0x0c:
		case 0x14:
		case 0x1c:
			return 160000000;
		case 0x05:
		case 0x0e:
		case 0x16:
		case 0x1e:
		case 0x1f:
			return 400000000;
		case 0x06:
			return 440000000;
		case 0x07:
		case 0x17:
			return 384000000;
		case 0x15:
		case 0x1d:
			return 200000000;
		default:
			return 320000000;
		}
	}
	case BCM6368_CPU_ID:
	{
		unsigned int tmp, p1, p2, ndiv, m1;

		/* (64MHz / P1) * P2 * NDIV / M1_CPU */
		tmp = bcm_ddr_readl(DDR_DMIPSPLLCFG_6368_REG);

		p1 = (tmp & DMIPSPLLCFG_6368_P1_MASK) >>
			DMIPSPLLCFG_6368_P1_SHIFT;

		p2 = (tmp & DMIPSPLLCFG_6368_P2_MASK) >>
			DMIPSPLLCFG_6368_P2_SHIFT;

		ndiv = (tmp & DMIPSPLLCFG_6368_NDIV_MASK) >>
			DMIPSPLLCFG_6368_NDIV_SHIFT;

		tmp = bcm_ddr_readl(DDR_DMIPSPLLDIV_6368_REG);
		m1 = (tmp & DMIPSPLLDIV_6368_MDIV_MASK) >>
			DMIPSPLLDIV_6368_MDIV_SHIFT;

		return (((64 * 1000000) / p1) * p2 * ndiv) / m1;
	}

	default:
		BUG();
	}
}

/*
 * attempt to detect the amount of memory installed
 */
static unsigned int detect_memory_size(void)
{
	unsigned int cols = 0, rows = 0, is_32bits = 0, banks = 0;
	u32 val;

	if (BCMCPU_IS_6328() || BCMCPU_IS_6362())
		return bcm_ddr_readl(DDR_CSEND_REG) << 24;

	if (BCMCPU_IS_6345()) {
		val = bcm_sdram_readl(SDRAM_MBASE_REG);
		return (val * 8 * 1024 * 1024);
	}

	if (BCMCPU_IS_6338() || BCMCPU_IS_6348()) {
		val = bcm_sdram_readl(SDRAM_CFG_REG);
		rows = (val & SDRAM_CFG_ROW_MASK) >> SDRAM_CFG_ROW_SHIFT;
		cols = (val & SDRAM_CFG_COL_MASK) >> SDRAM_CFG_COL_SHIFT;
		is_32bits = (val & SDRAM_CFG_32B_MASK) ? 1 : 0;
		banks = (val & SDRAM_CFG_BANK_MASK) ? 2 : 1;
	}

	if (BCMCPU_IS_6358() || BCMCPU_IS_6368()) {
		val = bcm_memc_readl(MEMC_CFG_REG);
		rows = (val & MEMC_CFG_ROW_MASK) >> MEMC_CFG_ROW_SHIFT;
		cols = (val & MEMC_CFG_COL_MASK) >> MEMC_CFG_COL_SHIFT;
		is_32bits = (val & MEMC_CFG_32B_MASK) ? 0 : 1;
		banks = 2;
	}

	/* 0 => 11 address bits ... 2 => 13 address bits */
	rows += 11;

	/* 0 => 8 address bits ... 2 => 10 address bits */
	cols += 8;

	return 1 << (cols + rows + (is_32bits + 1) + banks);
}

void __init bcm63xx_cpu_init(void)
{
	unsigned int tmp;
	struct cpuinfo_mips *c = &current_cpu_data;
	unsigned int cpu = smp_processor_id();
	u32 chipid_reg;

	/* soc registers location depends on cpu type */
	chipid_reg = 0;

	switch (c->cputype) {
	case CPU_BMIPS3300:
		if ((read_c0_prid() & 0xff00) != PRID_IMP_BMIPS3300_ALT)
			__cpu_name[cpu] = "Broadcom BCM6338";
		/* fall-through */
	case CPU_BMIPS32:
		chipid_reg = BCM_6345_PERF_BASE;
		break;
	case CPU_BMIPS4350:
		if ((read_c0_prid() & 0xf0) == 0x10)
			chipid_reg = BCM_6345_PERF_BASE;
		else
			chipid_reg = BCM_6368_PERF_BASE;
		break;
	}

	/*
	 * really early to panic, but delaying panic would not help since we
	 * will never get any working console
	 */
	if (!chipid_reg)
		panic("unsupported Broadcom CPU");

	/* read out CPU type */
	tmp = bcm_readl(chipid_reg);
	bcm63xx_cpu_id = (tmp & REV_CHIPID_MASK) >> REV_CHIPID_SHIFT;
	bcm63xx_cpu_rev = (tmp & REV_REVID_MASK) >> REV_REVID_SHIFT;

	switch (bcm63xx_cpu_id) {
	case BCM6328_CPU_ID:
		bcm63xx_regs_base = bcm6328_regs_base;
		bcm63xx_irqs = bcm6328_irqs;
		break;
	case BCM6338_CPU_ID:
		bcm63xx_regs_base = bcm6338_regs_base;
		bcm63xx_irqs = bcm6338_irqs;
		break;
	case BCM6345_CPU_ID:
		bcm63xx_regs_base = bcm6345_regs_base;
		bcm63xx_irqs = bcm6345_irqs;
		break;
	case BCM6348_CPU_ID:
		bcm63xx_regs_base = bcm6348_regs_base;
		bcm63xx_irqs = bcm6348_irqs;
		break;
	case BCM6358_CPU_ID:
		bcm63xx_regs_base = bcm6358_regs_base;
		bcm63xx_irqs = bcm6358_irqs;
		break;
	case BCM6362_CPU_ID:
		bcm63xx_regs_base = bcm6362_regs_base;
		bcm63xx_irqs = bcm6362_irqs;
		break;
	case BCM6368_CPU_ID:
		bcm63xx_regs_base = bcm6368_regs_base;
		bcm63xx_irqs = bcm6368_irqs;
		break;
	default:
		panic("unsupported broadcom CPU %x", bcm63xx_cpu_id);
		break;
	}

	bcm63xx_cpu_freq = detect_cpu_clock();
	bcm63xx_memory_size = detect_memory_size();

	printk(KERN_INFO "Detected Broadcom 0x%04x CPU revision %02x\n",
	       bcm63xx_cpu_id, bcm63xx_cpu_rev);
	printk(KERN_INFO "CPU frequency is %u MHz\n",
	       bcm63xx_cpu_freq / 1000000);
	printk(KERN_INFO "%uMB of RAM installed\n",
	       bcm63xx_memory_size >> 20);
}