aboutsummaryrefslogtreecommitdiff
path: root/arch/mips/bcm63xx/cpu.c
blob: 8f0d6c7725ea278eecf0fedca355fb5e33c7e824 (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
/*
 * 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 u16 bcm63xx_cpu_rev;
static unsigned int bcm63xx_cpu_freq;
static unsigned int bcm63xx_memory_size;

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 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);

u16 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 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 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_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, expected_cpu_id;
	struct cpuinfo_mips *c = &current_cpu_data;
	unsigned int cpu = smp_processor_id();

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

	switch (c->cputype) {
	case CPU_BMIPS3300:
		if ((read_c0_prid() & 0xff00) == PRID_IMP_BMIPS3300_ALT) {
			expected_cpu_id = BCM6348_CPU_ID;
			bcm63xx_regs_base = bcm6348_regs_base;
			bcm63xx_irqs = bcm6348_irqs;
		} else {
			__cpu_name[cpu] = "Broadcom BCM6338";
			expected_cpu_id = BCM6338_CPU_ID;
			bcm63xx_regs_base = bcm6338_regs_base;
			bcm63xx_irqs = bcm6338_irqs;
		}
		break;
	case CPU_BMIPS32:
		expected_cpu_id = BCM6345_CPU_ID;
		bcm63xx_regs_base = bcm6345_regs_base;
		bcm63xx_irqs = bcm6345_irqs;
		break;
	case CPU_BMIPS4350:
		switch (read_c0_prid() & 0xf0) {
		case 0x10:
			expected_cpu_id = BCM6358_CPU_ID;
			bcm63xx_regs_base = bcm6358_regs_base;
			bcm63xx_irqs = bcm6358_irqs;
			break;
		case 0x30:
			expected_cpu_id = BCM6368_CPU_ID;
			bcm63xx_regs_base = bcm6368_regs_base;
			bcm63xx_irqs = bcm6368_irqs;
			break;
		}
		break;
	}

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

	/*
	 * bcm63xx_regs_base is set, we can access soc registers
	 */

	/* double check CPU type */
	tmp = bcm_perf_readl(PERF_REV_REG);
	bcm63xx_cpu_id = (tmp & REV_CHIPID_MASK) >> REV_CHIPID_SHIFT;
	bcm63xx_cpu_rev = (tmp & REV_REVID_MASK) >> REV_REVID_SHIFT;

	if (bcm63xx_cpu_id != expected_cpu_id)
		panic("bcm63xx CPU id mismatch");

	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);
}