1/*
2 * Copyright 2013 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Ben Skeggs
23 */
24#include "priv.h"
25
26#include <subdev/bios.h>
27#include <subdev/bios/vmap.h>
28#include <subdev/bios/volt.h>
29#include <subdev/therm.h>
30
31int
32nvkm_volt_get(struct nvkm_volt *volt)
33{
34	int ret, i;
35
36	if (volt->func->volt_get)
37		return volt->func->volt_get(volt);
38
39	ret = volt->func->vid_get(volt);
40	if (ret >= 0) {
41		for (i = 0; i < volt->vid_nr; i++) {
42			if (volt->vid[i].vid == ret)
43				return volt->vid[i].uv;
44		}
45		ret = -EINVAL;
46	}
47	return ret;
48}
49
50static int
51nvkm_volt_set(struct nvkm_volt *volt, u32 uv)
52{
53	struct nvkm_subdev *subdev = &volt->subdev;
54	int i, ret = -EINVAL, best_err = volt->max_uv, best = -1;
55
56	if (volt->func->volt_set)
57		return volt->func->volt_set(volt, uv);
58
59	for (i = 0; i < volt->vid_nr; i++) {
60		int err = volt->vid[i].uv - uv;
61		if (err < 0 || err > best_err)
62			continue;
63
64		best_err = err;
65		best = i;
66		if (best_err == 0)
67			break;
68	}
69
70	if (best == -1) {
71		nvkm_error(subdev, "couldn't set %iuv\n", uv);
72		return ret;
73	}
74
75	ret = volt->func->vid_set(volt, volt->vid[best].vid);
76	nvkm_debug(subdev, "set req %duv to %duv: %d\n", uv,
77		   volt->vid[best].uv, ret);
78	return ret;
79}
80
81int
82nvkm_volt_map_min(struct nvkm_volt *volt, u8 id)
83{
84	struct nvkm_bios *bios = volt->subdev.device->bios;
85	struct nvbios_vmap_entry info;
86	u8  ver, len;
87	u32 vmap;
88
89	vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
90	if (vmap) {
91		if (info.link != 0xff) {
92			int ret = nvkm_volt_map_min(volt, info.link);
93			if (ret < 0)
94				return ret;
95			info.min += ret;
96		}
97		return info.min;
98	}
99
100	return id ? id * 10000 : -ENODEV;
101}
102
103int
104nvkm_volt_map(struct nvkm_volt *volt, u8 id, u8 temp)
105{
106	struct nvkm_bios *bios = volt->subdev.device->bios;
107	struct nvbios_vmap_entry info;
108	u8  ver, len;
109	u32 vmap;
110
111	vmap = nvbios_vmap_entry_parse(bios, id, &ver, &len, &info);
112	if (vmap) {
113		s64 result;
114
115		if (volt->speedo < 0)
116			return volt->speedo;
117
118		if (ver == 0x10 || (ver == 0x20 && info.mode == 0)) {
119			result  = div64_s64((s64)info.arg[0], 10);
120			result += div64_s64((s64)info.arg[1] * volt->speedo, 10);
121			result += div64_s64((s64)info.arg[2] * volt->speedo * volt->speedo, 100000);
122		} else if (ver == 0x20) {
123			switch (info.mode) {
124			/* 0x0 handled above! */
125			case 0x1:
126				result =  ((s64)info.arg[0] * 15625) >> 18;
127				result += ((s64)info.arg[1] * volt->speedo * 15625) >> 18;
128				result += ((s64)info.arg[2] * temp * 15625) >> 10;
129				result += ((s64)info.arg[3] * volt->speedo * temp * 15625) >> 18;
130				result += ((s64)info.arg[4] * volt->speedo * volt->speedo * 15625) >> 30;
131				result += ((s64)info.arg[5] * temp * temp * 15625) >> 18;
132				break;
133			case 0x3:
134				result = (info.min + info.max) / 2;
135				break;
136			case 0x2:
137			default:
138				result = info.min;
139				break;
140			}
141		} else {
142			return -ENODEV;
143		}
144
145		result = min(max(result, (s64)info.min), (s64)info.max);
146
147		if (info.link != 0xff) {
148			int ret = nvkm_volt_map(volt, info.link, temp);
149			if (ret < 0)
150				return ret;
151			result += ret;
152		}
153		return result;
154	}
155
156	return id ? id * 10000 : -ENODEV;
157}
158
159int
160nvkm_volt_set_id(struct nvkm_volt *volt, u8 id, u8 min_id, u8 temp,
161		 int condition)
162{
163	int ret;
164
165	if (volt->func->set_id)
166		return volt->func->set_id(volt, id, condition);
167
168	ret = nvkm_volt_map(volt, id, temp);
169	if (ret >= 0) {
170		int prev = nvkm_volt_get(volt);
171		if (!condition || prev < 0 ||
172		    (condition < 0 && ret < prev) ||
173		    (condition > 0 && ret > prev)) {
174			int min = nvkm_volt_map(volt, min_id, temp);
175			if (min >= 0)
176				ret = max(min, ret);
177			ret = nvkm_volt_set(volt, ret);
178		} else {
179			ret = 0;
180		}
181	}
182	return ret;
183}
184
185static void
186nvkm_volt_parse_bios(struct nvkm_bios *bios, struct nvkm_volt *volt)
187{
188	struct nvkm_subdev *subdev = &bios->subdev;
189	struct nvbios_volt_entry ivid;
190	struct nvbios_volt info;
191	u8  ver, hdr, cnt, len;
192	u32 data;
193	int i;
194
195	data = nvbios_volt_parse(bios, &ver, &hdr, &cnt, &len, &info);
196	if (data && info.vidmask && info.base && info.step && info.ranged) {
197		nvkm_debug(subdev, "found ranged based VIDs\n");
198		volt->min_uv = info.min;
199		volt->max_uv = info.max;
200		for (i = 0; i < info.vidmask + 1; i++) {
201			if (info.base >= info.min &&
202				info.base <= info.max) {
203				volt->vid[volt->vid_nr].uv = info.base;
204				volt->vid[volt->vid_nr].vid = i;
205				volt->vid_nr++;
206			}
207			info.base += info.step;
208		}
209		volt->vid_mask = info.vidmask;
210	} else if (data && info.vidmask && !info.ranged) {
211		nvkm_debug(subdev, "found entry based VIDs\n");
212		volt->min_uv = 0xffffffff;
213		volt->max_uv = 0;
214		for (i = 0; i < cnt; i++) {
215			data = nvbios_volt_entry_parse(bios, i, &ver, &hdr,
216						       &ivid);
217			if (data) {
218				volt->vid[volt->vid_nr].uv = ivid.voltage;
219				volt->vid[volt->vid_nr].vid = ivid.vid;
220				volt->vid_nr++;
221				volt->min_uv = min(volt->min_uv, ivid.voltage);
222				volt->max_uv = max(volt->max_uv, ivid.voltage);
223			}
224		}
225		volt->vid_mask = info.vidmask;
226	} else if (data && info.type == NVBIOS_VOLT_PWM) {
227		volt->min_uv = info.base;
228		volt->max_uv = info.base + info.pwm_range;
229	}
230}
231
232static int
233nvkm_volt_speedo_read(struct nvkm_volt *volt)
234{
235	if (volt->func->speedo_read)
236		return volt->func->speedo_read(volt);
237	return -EINVAL;
238}
239
240static int
241nvkm_volt_init(struct nvkm_subdev *subdev)
242{
243	struct nvkm_volt *volt = nvkm_volt(subdev);
244	int ret = nvkm_volt_get(volt);
245	if (ret < 0) {
246		if (ret != -ENODEV)
247			nvkm_debug(subdev, "current voltage unknown\n");
248		return 0;
249	}
250	nvkm_debug(subdev, "current voltage: %duv\n", ret);
251	return 0;
252}
253
254static int
255nvkm_volt_oneinit(struct nvkm_subdev *subdev)
256{
257	struct nvkm_volt *volt = nvkm_volt(subdev);
258
259	volt->speedo = nvkm_volt_speedo_read(volt);
260	if (volt->speedo > 0)
261		nvkm_debug(&volt->subdev, "speedo %x\n", volt->speedo);
262
263	if (volt->func->oneinit)
264		return volt->func->oneinit(volt);
265
266	return 0;
267}
268
269static void *
270nvkm_volt_dtor(struct nvkm_subdev *subdev)
271{
272	return nvkm_volt(subdev);
273}
274
275static const struct nvkm_subdev_func
276nvkm_volt = {
277	.dtor = nvkm_volt_dtor,
278	.init = nvkm_volt_init,
279	.oneinit = nvkm_volt_oneinit,
280};
281
282void
283nvkm_volt_ctor(const struct nvkm_volt_func *func, struct nvkm_device *device,
284	       enum nvkm_subdev_type type, int inst, struct nvkm_volt *volt)
285{
286	struct nvkm_bios *bios = device->bios;
287	int i;
288
289	nvkm_subdev_ctor(&nvkm_volt, device, type, inst, &volt->subdev);
290	volt->func = func;
291
292	/* Assuming the non-bios device should build the voltage table later */
293	if (bios) {
294		u8 ver, hdr, cnt, len;
295		struct nvbios_vmap vmap;
296
297		nvkm_volt_parse_bios(bios, volt);
298		nvkm_debug(&volt->subdev, "min: %iuv max: %iuv\n",
299			   volt->min_uv, volt->max_uv);
300
301		if (nvbios_vmap_parse(bios, &ver, &hdr, &cnt, &len, &vmap)) {
302			volt->max0_id = vmap.max0;
303			volt->max1_id = vmap.max1;
304			volt->max2_id = vmap.max2;
305		} else {
306			volt->max0_id = 0xff;
307			volt->max1_id = 0xff;
308			volt->max2_id = 0xff;
309		}
310	}
311
312	if (volt->vid_nr) {
313		for (i = 0; i < volt->vid_nr; i++) {
314			nvkm_debug(&volt->subdev, "VID %02x: %duv\n",
315				   volt->vid[i].vid, volt->vid[i].uv);
316		}
317	}
318}
319
320int
321nvkm_volt_new_(const struct nvkm_volt_func *func, struct nvkm_device *device,
322	       enum nvkm_subdev_type type, int inst, struct nvkm_volt **pvolt)
323{
324	if (!(*pvolt = kzalloc(sizeof(**pvolt), GFP_KERNEL)))
325		return -ENOMEM;
326	nvkm_volt_ctor(func, device, type, inst, *pvolt);
327	return 0;
328}
329