aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/nouveau/nvc0_pm.c
blob: ce65f81bb871d24ad889afac59aa306db5ac70e7 (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
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
/*
 * Copyright 2011 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#include "drmP.h"
#include "nouveau_drv.h"
#include "nouveau_bios.h"
#include "nouveau_pm.h"

static u32 read_div(struct drm_device *, int, u32, u32);
static u32 read_pll(struct drm_device *, u32);

static u32
read_vco(struct drm_device *dev, u32 dsrc)
{
	u32 ssrc = nv_rd32(dev, dsrc);
	if (!(ssrc & 0x00000100))
		return read_pll(dev, 0x00e800);
	return read_pll(dev, 0x00e820);
}

static u32
read_pll(struct drm_device *dev, u32 pll)
{
	u32 ctrl = nv_rd32(dev, pll + 0);
	u32 coef = nv_rd32(dev, pll + 4);
	u32 P = (coef & 0x003f0000) >> 16;
	u32 N = (coef & 0x0000ff00) >> 8;
	u32 M = (coef & 0x000000ff) >> 0;
	u32 sclk, doff;

	if (!(ctrl & 0x00000001))
		return 0;

	switch (pll & 0xfff000) {
	case 0x00e000:
		sclk = 27000;
		P = 1;
		break;
	case 0x137000:
		doff = (pll - 0x137000) / 0x20;
		sclk = read_div(dev, doff, 0x137120, 0x137140);
		break;
	case 0x132000:
		switch (pll) {
		case 0x132000:
			sclk = read_pll(dev, 0x132020);
			break;
		case 0x132020:
			sclk = read_div(dev, 0, 0x137320, 0x137330);
			break;
		default:
			return 0;
		}
		break;
	default:
		return 0;
	}

	return sclk * N / M / P;
}

static u32
read_div(struct drm_device *dev, int doff, u32 dsrc, u32 dctl)
{
	u32 ssrc = nv_rd32(dev, dsrc + (doff * 4));
	u32 sctl = nv_rd32(dev, dctl + (doff * 4));

	switch (ssrc & 0x00000003) {
	case 0:
		if ((ssrc & 0x00030000) != 0x00030000)
			return 27000;
		return 108000;
	case 2:
		return 100000;
	case 3:
		if (sctl & 0x80000000) {
			u32 sclk = read_vco(dev, dsrc + (doff * 4));
			u32 sdiv = (sctl & 0x0000003f) + 2;
			return (sclk * 2) / sdiv;
		}

		return read_vco(dev, dsrc + (doff * 4));
	default:
		return 0;
	}
}

static u32
read_mem(struct drm_device *dev)
{
	u32 ssel = nv_rd32(dev, 0x1373f0);
	if (ssel & 0x00000001)
		return read_div(dev, 0, 0x137300, 0x137310);
	return read_pll(dev, 0x132000);
}

static u32
read_clk(struct drm_device *dev, int clk)
{
	u32 sctl = nv_rd32(dev, 0x137250 + (clk * 4));
	u32 ssel = nv_rd32(dev, 0x137100);
	u32 sclk, sdiv;

	if (ssel & (1 << clk)) {
		if (clk < 7)
			sclk = read_pll(dev, 0x137000 + (clk * 0x20));
		else
			sclk = read_pll(dev, 0x1370e0);
		sdiv = ((sctl & 0x00003f00) >> 8) + 2;
	} else {
		sclk = read_div(dev, clk, 0x137160, 0x1371d0);
		sdiv = ((sctl & 0x0000003f) >> 0) + 2;
	}

	if (sctl & 0x80000000)
		return (sclk * 2) / sdiv;
	return sclk;
}

int
nvc0_pm_clocks_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
{
	perflvl->shader = read_clk(dev, 0x00);
	perflvl->core   = perflvl->shader / 2;
	perflvl->memory = read_mem(dev);
	perflvl->rop    = read_clk(dev, 0x01);
	perflvl->hub07  = read_clk(dev, 0x02);
	perflvl->hub06  = read_clk(dev, 0x07);
	perflvl->hub01  = read_clk(dev, 0x08);
	perflvl->copy   = read_clk(dev, 0x09);
	perflvl->daemon = read_clk(dev, 0x0c);
	perflvl->vdec   = read_clk(dev, 0x0e);
	return 0;
}

struct nvc0_pm_clock {
	u32 freq;
	u32 ssel;
	u32 mdiv;
	u32 dsrc;
	u32 ddiv;
	u32 coef;
};

struct nvc0_pm_state {
	struct nvc0_pm_clock eng[16];
};

static u32
calc_div(struct drm_device *dev, int clk, u32 ref, u32 freq, u32 *ddiv)
{
	u32 div = min((ref * 2) / freq, (u32)65);
	if (div < 2)
		div = 2;

	*ddiv = div - 2;
	return (ref * 2) / div;
}

static u32
calc_src(struct drm_device *dev, int clk, u32 freq, u32 *dsrc, u32 *ddiv)
{
	u32 sclk;

	/* use one of the fixed frequencies if possible */
	*ddiv = 0x00000000;
	switch (freq) {
	case  27000:
	case 108000:
		*dsrc = 0x00000000;
		if (freq == 108000)
			*dsrc |= 0x00030000;
		return freq;
	case 100000:
		*dsrc = 0x00000002;
		return freq;
	default:
		*dsrc = 0x00000003;
		break;
	}

	/* otherwise, calculate the closest divider */
	sclk = read_vco(dev, clk);
	if (clk < 7)
		sclk = calc_div(dev, clk, sclk, freq, ddiv);
	return sclk;
}

static u32
calc_pll(struct drm_device *dev, int clk, u32 freq, u32 *coef)
{
	struct pll_lims limits;
	int N, M, P, ret;

	ret = get_pll_limits(dev, 0x137000 + (clk * 0x20), &limits);
	if (ret)
		return 0;

	limits.refclk = read_div(dev, clk, 0x137120, 0x137140);
	if (!limits.refclk)
		return 0;

	ret = nva3_calc_pll(dev, &limits, freq, &N, NULL, &M, &P);
	if (ret <= 0)
		return 0;

	*coef = (P << 16) | (N << 8) | M;
	return ret;
}

/* A (likely rather simplified and incomplete) view of the clock tree
 *
 * Key:
 *
 * S: source select
 * D: divider
 * P: pll
 * F: switch
 *
 * Engine clocks:
 *
 * 137250(D) ---- 137100(F0) ---- 137160(S)/1371d0(D) ------------------- ref
 *                      (F1) ---- 1370X0(P) ---- 137120(S)/137140(D) ---- ref
 *
 * Not all registers exist for all clocks.  For example: clocks >= 8 don't
 * have their own PLL (all tied to clock 7's PLL when in PLL mode), nor do
 * they have the divider at 1371d0, though the source selection at 137160
 * still exists.  You must use the divider at 137250 for these instead.
 *
 * Memory clock:
 *
 * TBD, read_mem() above is likely very wrong...
 *
 */

static int
calc_clk(struct drm_device *dev, int clk, struct nvc0_pm_clock *info, u32 freq)
{
	u32 src0, div0, div1D, div1P = 0;
	u32 clk0, clk1 = 0;

	/* invalid clock domain */
	if (!freq)
		return 0;

	/* first possible path, using only dividers */
	clk0 = calc_src(dev, clk, freq, &src0, &div0);
	clk0 = calc_div(dev, clk, clk0, freq, &div1D);

	/* see if we can get any closer using PLLs */
	if (clk0 != freq && (0x00004387 & (1 << clk))) {
		if (clk < 7)
			clk1 = calc_pll(dev, clk, freq, &info->coef);
		else
			clk1 = read_pll(dev, 0x1370e0);
		clk1 = calc_div(dev, clk, clk1, freq, &div1P);
	}

	/* select the method which gets closest to target freq */
	if (abs((int)freq - clk0) <= abs((int)freq - clk1)) {
		info->dsrc = src0;
		if (div0) {
			info->ddiv |= 0x80000000;
			info->ddiv |= div0 << 8;
			info->ddiv |= div0;
		}
		if (div1D) {
			info->mdiv |= 0x80000000;
			info->mdiv |= div1D;
		}
		info->ssel = 0;
		info->freq = clk0;
	} else {
		if (div1P) {
			info->mdiv |= 0x80000000;
			info->mdiv |= div1P << 8;
		}
		info->ssel = (1 << clk);
		info->freq = clk1;
	}

	return 0;
}

void *
nvc0_pm_clocks_pre(struct drm_device *dev, struct nouveau_pm_level *perflvl)
{
	struct drm_nouveau_private *dev_priv = dev->dev_private;
	struct nvc0_pm_state *info;
	int ret;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return ERR_PTR(-ENOMEM);

	/* NFI why this is still in the performance table, the ROPCs appear
	 * to get their clock from clock 2 ("hub07", actually hub05 on this
	 * chip, but, anyway...) as well.  nvatiming confirms hub05 and ROP
	 * are always the same freq with the binary driver even when the
	 * performance table says they should differ.
	 */
	if (dev_priv->chipset == 0xd9)
		perflvl->rop = 0;

	if ((ret = calc_clk(dev, 0x00, &info->eng[0x00], perflvl->shader)) ||
	    (ret = calc_clk(dev, 0x01, &info->eng[0x01], perflvl->rop)) ||
	    (ret = calc_clk(dev, 0x02, &info->eng[0x02], perflvl->hub07)) ||
	    (ret = calc_clk(dev, 0x07, &info->eng[0x07], perflvl->hub06)) ||
	    (ret = calc_clk(dev, 0x08, &info->eng[0x08], perflvl->hub01)) ||
	    (ret = calc_clk(dev, 0x09, &info->eng[0x09], perflvl->copy)) ||
	    (ret = calc_clk(dev, 0x0c, &info->eng[0x0c], perflvl->daemon)) ||
	    (ret = calc_clk(dev, 0x0e, &info->eng[0x0e], perflvl->vdec))) {
		kfree(info);
		return ERR_PTR(ret);
	}

	return info;
}

static void
prog_clk(struct drm_device *dev, int clk, struct nvc0_pm_clock *info)
{
	/* program dividers at 137160/1371d0 first */
	if (clk < 7 && !info->ssel) {
		nv_mask(dev, 0x1371d0 + (clk * 0x04), 0x80003f3f, info->ddiv);
		nv_wr32(dev, 0x137160 + (clk * 0x04), info->dsrc);
	}

	/* switch clock to non-pll mode */
	nv_mask(dev, 0x137100, (1 << clk), 0x00000000);
	nv_wait(dev, 0x137100, (1 << clk), 0x00000000);

	/* reprogram pll */
	if (clk < 7) {
		/* make sure it's disabled first... */
		u32 base = 0x137000 + (clk * 0x20);
		u32 ctrl = nv_rd32(dev, base + 0x00);
		if (ctrl & 0x00000001) {
			nv_mask(dev, base + 0x00, 0x00000004, 0x00000000);
			nv_mask(dev, base + 0x00, 0x00000001, 0x00000000);
		}
		/* program it to new values, if necessary */
		if (info->ssel) {
			nv_wr32(dev, base + 0x04, info->coef);
			nv_mask(dev, base + 0x00, 0x00000001, 0x00000001);
			nv_wait(dev, base + 0x00, 0x00020000, 0x00020000);
			nv_mask(dev, base + 0x00, 0x00020004, 0x00000004);
		}
	}

	/* select pll/non-pll mode, and program final clock divider */
	nv_mask(dev, 0x137100, (1 << clk), info->ssel);
	nv_wait(dev, 0x137100, (1 << clk), info->ssel);
	nv_mask(dev, 0x137250 + (clk * 0x04), 0x00003f3f, info->mdiv);
}

int
nvc0_pm_clocks_set(struct drm_device *dev, void *data)
{
	struct nvc0_pm_state *info = data;
	int i;

	for (i = 0; i < 16; i++) {
		if (!info->eng[i].freq)
			continue;
		prog_clk(dev, i, &info->eng[i]);
	}

	kfree(info);
	return 0;
}