summaryrefslogtreecommitdiffstats
path: root/arch/mips/bcm63xx/clk.c
blob: 9d57c71b7b582cc9c24f664df6ae156bc9752522 (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
/*
 * 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>
 */

#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <bcm63xx_cpu.h>
#include <bcm63xx_io.h>
#include <bcm63xx_regs.h>
#include <bcm63xx_clk.h>

static DEFINE_MUTEX(clocks_mutex);


static void clk_enable_unlocked(struct clk *clk)
{
	if (clk->set && (clk->usage++) == 0)
		clk->set(clk, 1);
}

static void clk_disable_unlocked(struct clk *clk)
{
	if (clk->set && (--clk->usage) == 0)
		clk->set(clk, 0);
}

static void bcm_hwclock_set(u32 mask, int enable)
{
	u32 reg;

	reg = bcm_perf_readl(PERF_CKCTL_REG);
	if (enable)
		reg |= mask;
	else
		reg &= ~mask;
	bcm_perf_writel(reg, PERF_CKCTL_REG);
}

/*
 * Ethernet MAC "misc" clock: dma clocks and main clock on 6348
 */
static void enet_misc_set(struct clk *clk, int enable)
{
	u32 mask;

	if (BCMCPU_IS_6338())
		mask = CKCTL_6338_ENET_EN;
	else if (BCMCPU_IS_6345())
		mask = CKCTL_6345_ENET_EN;
	else if (BCMCPU_IS_6348())
		mask = CKCTL_6348_ENET_EN;
	else
		/* BCMCPU_IS_6358 */
		mask = CKCTL_6358_EMUSB_EN;
	bcm_hwclock_set(mask, enable);
}

static struct clk clk_enet_misc = {
	.set	= enet_misc_set,
};

/*
 * Ethernet MAC clocks: only revelant on 6358, silently enable misc
 * clocks
 */
static void enetx_set(struct clk *clk, int enable)
{
	if (enable)
		clk_enable_unlocked(&clk_enet_misc);
	else
		clk_disable_unlocked(&clk_enet_misc);

	if (BCMCPU_IS_6358()) {
		u32 mask;

		if (clk->id == 0)
			mask = CKCTL_6358_ENET0_EN;
		else
			mask = CKCTL_6358_ENET1_EN;
		bcm_hwclock_set(mask, enable);
	}
}

static struct clk clk_enet0 = {
	.id	= 0,
	.set	= enetx_set,
};

static struct clk clk_enet1 = {
	.id	= 1,
	.set	= enetx_set,
};

/*
 * Ethernet PHY clock
 */
static void ephy_set(struct clk *clk, int enable)
{
	if (!BCMCPU_IS_6358())
		return;
	bcm_hwclock_set(CKCTL_6358_EPHY_EN, enable);
}


static struct clk clk_ephy = {
	.set	= ephy_set,
};

/*
 * Ethernet switch clock
 */
static void enetsw_set(struct clk *clk, int enable)
{
	if (!BCMCPU_IS_6368())
		return;
	bcm_hwclock_set(CKCTL_6368_ROBOSW_CLK_EN |
			CKCTL_6368_SWPKT_USB_EN |
			CKCTL_6368_SWPKT_SAR_EN, enable);
	if (enable) {
		u32 val;

		/* reset switch core afer clock change */
		val = bcm_perf_readl(PERF_SOFTRESET_6368_REG);
		val &= ~SOFTRESET_6368_ENETSW_MASK;
		bcm_perf_writel(val, PERF_SOFTRESET_6368_REG);
		msleep(10);
		val |= SOFTRESET_6368_ENETSW_MASK;
		bcm_perf_writel(val, PERF_SOFTRESET_6368_REG);
		msleep(10);
	}
}

static struct clk clk_enetsw = {
	.set	= enetsw_set,
};

/*
 * PCM clock
 */
static void pcm_set(struct clk *clk, int enable)
{
	if (!BCMCPU_IS_6358())
		return;
	bcm_hwclock_set(CKCTL_6358_PCM_EN, enable);
}

static struct clk clk_pcm = {
	.set	= pcm_set,
};

/*
 * USB host clock
 */
static void usbh_set(struct clk *clk, int enable)
{
	if (BCMCPU_IS_6348())
		bcm_hwclock_set(CKCTL_6348_USBH_EN, enable);
	else if (BCMCPU_IS_6368())
		bcm_hwclock_set(CKCTL_6368_USBH_CLK_EN, enable);
}

static struct clk clk_usbh = {
	.set	= usbh_set,
};

/*
 * SPI clock
 */
static void spi_set(struct clk *clk, int enable)
{
	u32 mask;

	if (BCMCPU_IS_6338())
		mask = CKCTL_6338_SPI_EN;
	else if (BCMCPU_IS_6348())
		mask = CKCTL_6348_SPI_EN;
	else
		/* BCMCPU_IS_6358 */
		mask = CKCTL_6358_SPI_EN;
	bcm_hwclock_set(mask, enable);
}

static struct clk clk_spi = {
	.set	= spi_set,
};

/*
 * XTM clock
 */
static void xtm_set(struct clk *clk, int enable)
{
	if (!BCMCPU_IS_6368())
		return;

	bcm_hwclock_set(CKCTL_6368_SAR_CLK_EN |
			CKCTL_6368_SWPKT_SAR_EN, enable);

	if (enable) {
		u32 val;

		/* reset sar core afer clock change */
		val = bcm_perf_readl(PERF_SOFTRESET_6368_REG);
		val &= ~SOFTRESET_6368_SAR_MASK;
		bcm_perf_writel(val, PERF_SOFTRESET_6368_REG);
		mdelay(1);
		val |= SOFTRESET_6368_SAR_MASK;
		bcm_perf_writel(val, PERF_SOFTRESET_6368_REG);
		mdelay(1);
	}
}


static struct clk clk_xtm = {
	.set	= xtm_set,
};

/*
 * Internal peripheral clock
 */
static struct clk clk_periph = {
	.rate	= (50 * 1000 * 1000),
};


/*
 * Linux clock API implementation
 */
int clk_enable(struct clk *clk)
{
	mutex_lock(&clocks_mutex);
	clk_enable_unlocked(clk);
	mutex_unlock(&clocks_mutex);
	return 0;
}

EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)
{
	mutex_lock(&clocks_mutex);
	clk_disable_unlocked(clk);
	mutex_unlock(&clocks_mutex);
}

EXPORT_SYMBOL(clk_disable);

unsigned long clk_get_rate(struct clk *clk)
{
	return clk->rate;
}

EXPORT_SYMBOL(clk_get_rate);

struct clk *clk_get(struct device *dev, const char *id)
{
	if (!strcmp(id, "enet0"))
		return &clk_enet0;
	if (!strcmp(id, "enet1"))
		return &clk_enet1;
	if (!strcmp(id, "enetsw"))
		return &clk_enetsw;
	if (!strcmp(id, "ephy"))
		return &clk_ephy;
	if (!strcmp(id, "usbh"))
		return &clk_usbh;
	if (!strcmp(id, "spi"))
		return &clk_spi;
	if (!strcmp(id, "xtm"))
		return &clk_xtm;
	if (!strcmp(id, "periph"))
		return &clk_periph;
	if (BCMCPU_IS_6358() && !strcmp(id, "pcm"))
		return &clk_pcm;
	return ERR_PTR(-ENOENT);
}

EXPORT_SYMBOL(clk_get);

void clk_put(struct clk *clk)
{
}

EXPORT_SYMBOL(clk_put);