summaryrefslogtreecommitdiffstats
path: root/arch/blackfin/mach-bf609/clock.c
blob: b50412c8cab0309a2330a062f9dab0dbd25ad42e (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
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/clk.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/io.h>
#include <linux/seq_file.h>
#include <linux/clkdev.h>

#include <asm/clocks.h>

#define CGU0_CTL_DF (1 << 0)

#define CGU0_CTL_MSEL_SHIFT 8
#define CGU0_CTL_MSEL_MASK (0x7f << 8)

#define CGU0_STAT_PLLEN (1 << 0)
#define CGU0_STAT_PLLBP (1 << 1)
#define CGU0_STAT_PLLLK (1 << 2)
#define CGU0_STAT_CLKSALGN (1 << 3)
#define CGU0_STAT_CCBF0 (1 << 4)
#define CGU0_STAT_CCBF1 (1 << 5)
#define CGU0_STAT_SCBF0 (1 << 6)
#define CGU0_STAT_SCBF1 (1 << 7)
#define CGU0_STAT_DCBF (1 << 8)
#define CGU0_STAT_OCBF (1 << 9)
#define CGU0_STAT_ADDRERR (1 << 16)
#define CGU0_STAT_LWERR (1 << 17)
#define CGU0_STAT_DIVERR (1 << 18)
#define CGU0_STAT_WDFMSERR (1 << 19)
#define CGU0_STAT_WDIVERR (1 << 20)
#define CGU0_STAT_PLOCKERR (1 << 21)

#define CGU0_DIV_CSEL_SHIFT 0
#define CGU0_DIV_CSEL_MASK 0x0000001F
#define CGU0_DIV_S0SEL_SHIFT 5
#define CGU0_DIV_S0SEL_MASK (0x3 << CGU0_DIV_S0SEL_SHIFT)
#define CGU0_DIV_SYSSEL_SHIFT 8
#define CGU0_DIV_SYSSEL_MASK (0x1f << CGU0_DIV_SYSSEL_SHIFT)
#define CGU0_DIV_S1SEL_SHIFT 13
#define CGU0_DIV_S1SEL_MASK (0x3 << CGU0_DIV_S1SEL_SHIFT)
#define CGU0_DIV_DSEL_SHIFT 16
#define CGU0_DIV_DSEL_MASK (0x1f << CGU0_DIV_DSEL_SHIFT)
#define CGU0_DIV_OSEL_SHIFT 22
#define CGU0_DIV_OSEL_MASK (0x7f << CGU0_DIV_OSEL_SHIFT)

#define CLK(_clk, _devname, _conname)                   \
	{                                               \
		.clk    = &_clk,                  \
		.dev_id = _devname,                     \
		.con_id = _conname,                     \
	}

#define NEEDS_INITIALIZATION 0x11

static LIST_HEAD(clk_list);

static void clk_reg_write_mask(u32 reg, uint32_t val, uint32_t mask)
{
	u32 val2;

	val2 = bfin_read32(reg);
	val2 &= ~mask;
	val2 |= val;
	bfin_write32(reg, val2);
}

static void clk_reg_set_bits(u32 reg, uint32_t mask)
{
	u32 val;

	val = bfin_read32(reg);
	val |= mask;
	bfin_write32(reg, val);
}

static void clk_reg_clear_bits(u32 reg, uint32_t mask)
{
	u32 val;

	val = bfin_read32(reg);
	val &= ~mask;
	bfin_write32(reg, val);
}

int wait_for_pll_align(void)
{
	int i = 10000;
	while (i-- && (bfin_read32(CGU0_STAT) & CGU0_STAT_CLKSALGN));

	if (bfin_read32(CGU0_STAT) & CGU0_STAT_CLKSALGN) {
		printk(KERN_DEBUG "fail to align clk\n");
		return -1;
	}
	return 0;
}

int clk_enable(struct clk *clk)
{
	int ret = -EIO;
	if (clk->ops && clk->ops->enable)
		ret = clk->ops->enable(clk);
	return ret;
}
EXPORT_SYMBOL(clk_enable);

void clk_disable(struct clk *clk)
{
	if (clk->ops && clk->ops->disable)
		clk->ops->disable(clk);
}
EXPORT_SYMBOL(clk_disable);

unsigned long clk_get_rate(struct clk *clk)
{
	unsigned long ret = 0;
	if (clk->ops && clk->ops->get_rate)
		ret = clk->ops->get_rate(clk);
	return ret;
}
EXPORT_SYMBOL(clk_get_rate);

long clk_round_rate(struct clk *clk, unsigned long rate)
{
	long ret = -EIO;
	if (clk->ops && clk->ops->round_rate)
		ret = clk->ops->round_rate(clk, rate);
	return ret;
}
EXPORT_SYMBOL(clk_round_rate);

int clk_set_rate(struct clk *clk, unsigned long rate)
{
	int ret = -EIO;
	if (clk->ops && clk->ops->set_rate)
		ret = clk->ops->set_rate(clk, rate);
	return ret;
}
EXPORT_SYMBOL(clk_set_rate);

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

unsigned long pll_get_rate(struct clk *clk)
{
	u32 df;
	u32 msel;
	u32 ctl = bfin_read32(CGU0_CTL);
	u32 stat = bfin_read32(CGU0_STAT);
	if (stat & CGU0_STAT_PLLBP)
		return 0;
	msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT;
	df = (ctl &  CGU0_CTL_DF);
	clk->parent->rate = clk_get_rate(clk->parent);
	return clk->parent->rate / (df + 1) * msel * 2;
}

unsigned long pll_round_rate(struct clk *clk, unsigned long rate)
{
	u32 div;
	div = rate / clk->parent->rate;
	return clk->parent->rate * div;
}

int pll_set_rate(struct clk *clk, unsigned long rate)
{
	u32 msel;
	u32 stat = bfin_read32(CGU0_STAT);
	if (!(stat & CGU0_STAT_PLLEN))
		return -EBUSY;
	if (!(stat & CGU0_STAT_PLLLK))
		return -EBUSY;
	if (wait_for_pll_align())
		return -EBUSY;
	msel = rate / clk->parent->rate / 2;
	clk_reg_write_mask(CGU0_CTL, msel << CGU0_CTL_MSEL_SHIFT,
		CGU0_CTL_MSEL_MASK);
	clk->rate = rate;
	return 0;
}

unsigned long cclk_get_rate(struct clk *clk)
{
	if (clk->parent)
		return clk->parent->rate;
	else
		return 0;
}

unsigned long sys_clk_get_rate(struct clk *clk)
{
	unsigned long drate;
	u32 msel;
	u32 df;
	u32 ctl = bfin_read32(CGU0_CTL);
	u32 div = bfin_read32(CGU0_DIV);
	div = (div & clk->mask) >> clk->shift;
	msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT;
	df = (ctl &  CGU0_CTL_DF);

	if (!strcmp(clk->parent->name, "SYS_CLKIN")) {
		drate = clk->parent->rate / (df + 1);
		drate *=  msel;
		drate /= div;
		return drate;
	} else {
		clk->parent->rate = clk_get_rate(clk->parent);
		return clk->parent->rate / div;
	}
}

unsigned long sys_clk_round_rate(struct clk *clk, unsigned long rate)
{
	unsigned long max_rate;
	unsigned long drate;
	int i;
	u32 msel;
	u32 df;
	u32 ctl = bfin_read32(CGU0_CTL);

	msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT;
	df = (ctl &  CGU0_CTL_DF);
	max_rate = clk->parent->rate / (df + 1) * msel;

	if (rate > max_rate)
		return 0;

	for (i = 1; i < clk->mask; i++) {
		drate = max_rate / i;
		if (rate >= drate)
			return drate;
	}
	return 0;
}

int sys_clk_set_rate(struct clk *clk, unsigned long rate)
{
	u32 div = bfin_read32(CGU0_DIV);
	div = (div & clk->mask) >> clk->shift;

	rate = clk_round_rate(clk, rate);

	if (!rate)
		return -EINVAL;

	div = (clk_get_rate(clk) * div) / rate;

	if (wait_for_pll_align())
		return -EBUSY;
	clk_reg_write_mask(CGU0_DIV, div << clk->shift,
			clk->mask);
	clk->rate = rate;
	return 0;
}

static struct clk_ops vco_ops = {
	.get_rate = vco_get_rate,
};

static struct clk_ops pll_ops = {
	.get_rate = pll_get_rate,
	.set_rate = pll_set_rate,
};

static struct clk_ops cclk_ops = {
	.get_rate = cclk_get_rate,
};

static struct clk_ops sys_clk_ops = {
	.get_rate = sys_clk_get_rate,
	.set_rate = sys_clk_set_rate,
	.round_rate = sys_clk_round_rate,
};

static struct clk sys_clkin = {
	.name       = "SYS_CLKIN",
	.rate       = CONFIG_CLKIN_HZ,
	.ops        = &vco_ops,
};

static struct clk pll_clk = {
	.name       = "PLLCLK",
	.rate       = 500000000,
	.parent     = &sys_clkin,
	.ops = &pll_ops,
	.flags = NEEDS_INITIALIZATION,
};

static struct clk cclk = {
	.name       = "CCLK",
	.rate       = 500000000,
	.mask       = CGU0_DIV_CSEL_MASK,
	.shift      = CGU0_DIV_CSEL_SHIFT,
	.parent     = &sys_clkin,
	.ops	    = &sys_clk_ops,
	.flags = NEEDS_INITIALIZATION,
};

static struct clk cclk0 = {
	.name       = "CCLK0",
	.parent     = &cclk,
	.ops	    = &cclk_ops,
};

static struct clk cclk1 = {
	.name       = "CCLK1",
	.parent     = &cclk,
	.ops	    = &cclk_ops,
};

static struct clk sysclk = {
	.name       = "SYSCLK",
	.rate       = 500000000,
	.mask       = CGU0_DIV_SYSSEL_MASK,
	.shift      = CGU0_DIV_SYSSEL_SHIFT,
	.parent     = &sys_clkin,
	.ops	    = &sys_clk_ops,
	.flags = NEEDS_INITIALIZATION,
};

static struct clk sclk0 = {
	.name       = "SCLK0",
	.rate       = 500000000,
	.mask       = CGU0_DIV_S0SEL_MASK,
	.shift      = CGU0_DIV_S0SEL_SHIFT,
	.parent     = &sysclk,
	.ops	    = &sys_clk_ops,
};

static struct clk sclk1 = {
	.name       = "SCLK1",
	.rate       = 500000000,
	.mask       = CGU0_DIV_S1SEL_MASK,
	.shift      = CGU0_DIV_S1SEL_SHIFT,
	.parent     = &sysclk,
	.ops	    = &sys_clk_ops,
};

static struct clk dclk = {
	.name       = "DCLK",
	.rate       = 500000000,
	.mask       = CGU0_DIV_DSEL_MASK,
	.shift       = CGU0_DIV_DSEL_SHIFT,
	.parent     = &pll_clk,
	.ops	    = &sys_clk_ops,
};

static struct clk oclk = {
	.name       = "OCLK",
	.rate       = 500000000,
	.mask       = CGU0_DIV_OSEL_MASK,
	.shift      = CGU0_DIV_OSEL_SHIFT,
	.parent     = &pll_clk,
};

static struct clk_lookup bf609_clks[] = {
	CLK(sys_clkin, NULL, "SYS_CLKIN"),
	CLK(pll_clk, NULL, "PLLCLK"),
	CLK(cclk, NULL, "CCLK"),
	CLK(cclk0, NULL, "CCLK0"),
	CLK(cclk1, NULL, "CCLK1"),
	CLK(sysclk, NULL, "SYSCLK"),
	CLK(sclk0, NULL, "SCLK0"),
	CLK(sclk1, NULL, "SCLK1"),
	CLK(dclk, NULL, "DCLK"),
	CLK(oclk, NULL, "OCLK"),
};

int __init clk_init(void)
{
	int i;
	struct clk *clkp;
	for (i = 0; i < ARRAY_SIZE(bf609_clks); i++) {
		clkp = bf609_clks[i].clk;
		if (clkp->flags & NEEDS_INITIALIZATION)
			clk_get_rate(clkp);
	}
	clkdev_add_table(bf609_clks, ARRAY_SIZE(bf609_clks));
	return 0;
}