2 * Copyright 2010 Red Hat Inc.
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5 * copy of this software and associated documentation files (the "Software"),
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9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
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
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19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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27 #include "nouveau_drm.h"
28 #include "nouveau_pm.h"
30 #include <subdev/bios/gpio.h>
31 #include <subdev/gpio.h>
33 static const enum dcb_gpio_func_name vidtag[] = { 0x04, 0x05, 0x06, 0x1a, 0x73 };
34 static int nr_vidtag = sizeof(vidtag) / sizeof(vidtag[0]);
37 nouveau_voltage_gpio_get(struct drm_device *dev)
39 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
40 struct nouveau_device *device = nouveau_dev(dev);
41 struct nouveau_gpio *gpio = nouveau_gpio(device);
45 for (i = 0; i < nr_vidtag; i++) {
46 if (!(volt->vid_mask & (1 << i)))
49 vid |= gpio->get(gpio, 0, vidtag[i], 0xff) << i;
52 return nouveau_volt_lvl_lookup(dev, vid);
56 nouveau_voltage_gpio_set(struct drm_device *dev, int voltage)
58 struct nouveau_device *device = nouveau_dev(dev);
59 struct nouveau_gpio *gpio = nouveau_gpio(device);
60 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
63 vid = nouveau_volt_vid_lookup(dev, voltage);
67 for (i = 0; i < nr_vidtag; i++) {
68 if (!(volt->vid_mask & (1 << i)))
71 gpio->set(gpio, 0, vidtag[i], 0xff, !!(vid & (1 << i)));
78 nouveau_volt_vid_lookup(struct drm_device *dev, int voltage)
80 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
83 for (i = 0; i < volt->nr_level; i++) {
84 if (volt->level[i].voltage == voltage)
85 return volt->level[i].vid;
92 nouveau_volt_lvl_lookup(struct drm_device *dev, int vid)
94 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;
97 for (i = 0; i < volt->nr_level; i++) {
98 if (volt->level[i].vid == vid)
99 return volt->level[i].voltage;
106 nouveau_volt_init(struct drm_device *dev)
108 struct nouveau_drm *drm = nouveau_drm(dev);
109 struct nouveau_gpio *gpio = nouveau_gpio(drm->device);
110 struct nouveau_pm *pm = nouveau_pm(dev);
111 struct nouveau_pm_voltage *voltage = &pm->voltage;
112 struct nvbios *bios = &drm->vbios;
113 struct dcb_gpio_func func;
115 u8 *volt = NULL, *entry;
116 int i, headerlen, recordlen, entries, vidmask, vidshift;
118 if (bios->type == NVBIOS_BIT) {
119 if (bit_table(dev, 'P', &P))
123 volt = ROMPTR(dev, P.data[16]);
126 volt = ROMPTR(dev, P.data[12]);
128 NV_WARN(drm, "unknown volt for BIT P %d\n", P.version);
131 if (bios->data[bios->offset + 6] < 0x27) {
132 NV_DEBUG(drm, "BMP version too old for voltage\n");
136 volt = ROMPTR(dev, bios->data[bios->offset + 0x98]);
140 NV_DEBUG(drm, "voltage table pointer invalid\n");
158 vidshift = 0; /* could be vidshift like 0x30? */
166 /* no longer certain what volt[5] is, if it's related to
167 * the vid shift then it's definitely not a function of
168 * how many bits are set.
170 * after looking at a number of nva3+ vbios images, they
171 * all seem likely to have a static shift of 2.. lets
172 * go with that for now until proven otherwise.
179 entries = volt[3]; /* not a clue what the entries are for.. */
180 vidmask = volt[11]; /* guess.. */
184 NV_WARN(drm, "voltage table 0x%02x unknown\n", volt[0]);
188 /* validate vid mask */
189 voltage->vid_mask = vidmask;
190 if (!voltage->vid_mask)
196 NV_DEBUG(drm, "vid bit %d unknown\n", i);
200 if (gpio && gpio->find(gpio, 0, vidtag[i], 0xff, &func)) {
201 NV_DEBUG(drm, "vid bit %d has no gpio tag\n", i);
209 /* parse vbios entries into common format */
210 voltage->version = volt[0];
211 if (voltage->version < 0x40) {
212 voltage->nr_level = entries;
214 kcalloc(entries, sizeof(*voltage->level), GFP_KERNEL);
218 entry = volt + headerlen;
219 for (i = 0; i < entries; i++, entry += recordlen) {
220 voltage->level[i].voltage = entry[0] * 10000;
221 voltage->level[i].vid = entry[1] >> vidshift;
224 u32 volt_uv = ROM32(volt[4]);
225 s16 step_uv = ROM16(volt[8]);
228 voltage->nr_level = voltage->vid_mask + 1;
229 voltage->level = kcalloc(voltage->nr_level,
230 sizeof(*voltage->level), GFP_KERNEL);
234 for (vid = 0; vid <= voltage->vid_mask; vid++) {
235 voltage->level[vid].voltage = volt_uv;
236 voltage->level[vid].vid = vid;
241 voltage->supported = true;
245 nouveau_volt_fini(struct drm_device *dev)
247 struct nouveau_pm_voltage *volt = &nouveau_pm(dev)->voltage;