LXR linux/drivers/gpu/drm/nouveau/nouveau

   1/*
   2 * Copyright 2010 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
  25#include "drmP.h"
  26
  27#include "nouveau_drv.h"
  28#include "nouveau_pm.h"
  29
  30static const enum dcb_gpio_tag vidtag[] = { 0x04, 0x05, 0x06, 0x1a, 0x73 };
  31static int nr_vidtag = sizeof(vidtag) / sizeof(vidtag[0]);
  32
  33int
  34nouveau_voltage_gpio_get(struct drm_device *dev)
  35{
  36        struct drm_nouveau_private *dev_priv = dev->dev_private;
  37        struct nouveau_gpio_engine *gpio = &dev_priv->engine.gpio;
  38        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
  39        u8 vid = 0;
  40        int i;
  41
  42        for (i = 0; i < nr_vidtag; i++) {
  43                if (!(volt->vid_mask & (1 << i)))
  44                        continue;
  45
  46                vid |= gpio->get(dev, vidtag[i]) << i;
  47        }
  48
  49        return nouveau_volt_lvl_lookup(dev, vid);
  50}
  51
  52int
  53nouveau_voltage_gpio_set(struct drm_device *dev, int voltage)
  54{
  55        struct drm_nouveau_private *dev_priv = dev->dev_private;
  56        struct nouveau_gpio_engine *gpio = &dev_priv->engine.gpio;
  57        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
  58        int vid, i;
  59
  60        vid = nouveau_volt_vid_lookup(dev, voltage);
  61        if (vid < 0)
  62                return vid;
  63
  64        for (i = 0; i < nr_vidtag; i++) {
  65                if (!(volt->vid_mask & (1 << i)))
  66                        continue;
  67
  68                gpio->set(dev, vidtag[i], !!(vid & (1 << i)));
  69        }
  70
  71        return 0;
  72}
  73
  74int
  75nouveau_volt_vid_lookup(struct drm_device *dev, int voltage)
  76{
  77        struct drm_nouveau_private *dev_priv = dev->dev_private;
  78        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
  79        int i;
  80
  81        for (i = 0; i < volt->nr_level; i++) {
  82                if (volt->level[i].voltage == voltage)
  83                        return volt->level[i].vid;
  84        }
  85
  86        return -ENOENT;
  87}
  88
  89int
  90nouveau_volt_lvl_lookup(struct drm_device *dev, int vid)
  91{
  92        struct drm_nouveau_private *dev_priv = dev->dev_private;
  93        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
  94        int i;
  95
  96        for (i = 0; i < volt->nr_level; i++) {
  97                if (volt->level[i].vid == vid)
  98                        return volt->level[i].voltage;
  99        }
 100
 101        return -ENOENT;
 102}
 103
 104void
 105nouveau_volt_init(struct drm_device *dev)
 106{
 107        struct drm_nouveau_private *dev_priv = dev->dev_private;
 108        struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
 109        struct nouveau_pm_voltage *voltage = &pm->voltage;
 110        struct nvbios *bios = &dev_priv->vbios;
 111        struct bit_entry P;
 112        u8 *volt = NULL, *entry;
 113        int i, headerlen, recordlen, entries, vidmask, vidshift;
 114
 115        if (bios->type == NVBIOS_BIT) {
 116                if (bit_table(dev, 'P', &P))
 117                        return;
 118
 119                if (P.version == 1)
 120                        volt = ROMPTR(bios, P.data[16]);
 121                else
 122                if (P.version == 2)
 123                        volt = ROMPTR(bios, P.data[12]);
 124                else {
 125                        NV_WARN(dev, "unknown volt for BIT P %d\n", P.version);
 126                }
 127        } else {
 128                if (bios->data[bios->offset + 6] < 0x27) {
 129                        NV_DEBUG(dev, "BMP version too old for voltage\n");
 130                        return;
 131                }
 132
 133                volt = ROMPTR(bios, bios->data[bios->offset + 0x98]);
 134        }
 135
 136        if (!volt) {
 137                NV_DEBUG(dev, "voltage table pointer invalid\n");
 138                return;
 139        }
 140
 141        switch (volt[0]) {
 142        case 0x10:
 143        case 0x11:
 144        case 0x12:
 145                headerlen = 5;
 146                recordlen = volt[1];
 147                entries   = volt[2];
 148                vidshift  = 0;
 149                vidmask   = volt[4];
 150                break;
 151        case 0x20:
 152                headerlen = volt[1];
 153                recordlen = volt[3];
 154                entries   = volt[2];
 155                vidshift  = 0; /* could be vidshift like 0x30? */
 156                vidmask   = volt[5];
 157                break;
 158        case 0x30:
 159                headerlen = volt[1];
 160                recordlen = volt[2];
 161                entries   = volt[3];
 162                vidmask   = volt[4];
 163                /* no longer certain what volt[5] is, if it's related to
 164                 * the vid shift then it's definitely not a function of
 165                 * how many bits are set.
 166                 *
 167                 * after looking at a number of nva3+ vbios images, they
 168                 * all seem likely to have a static shift of 2.. lets
 169                 * go with that for now until proven otherwise.
 170                 */
 171                vidshift  = 2;
 172                break;
 173        case 0x40:
 174                headerlen = volt[1];
 175                recordlen = volt[2];
 176                entries   = volt[3]; /* not a clue what the entries are for.. */
 177                vidmask   = volt[11]; /* guess.. */
 178                vidshift  = 0;
 179                break;
 180        default:
 181                NV_WARN(dev, "voltage table 0x%02x unknown\n", volt[0]);
 182                return;
 183        }
 184
 185        /* validate vid mask */
 186        voltage->vid_mask = vidmask;
 187        if (!voltage->vid_mask)
 188                return;
 189
 190        i = 0;
 191        while (vidmask) {
 192                if (i > nr_vidtag) {
 193                        NV_DEBUG(dev, "vid bit %d unknown\n", i);
 194                        return;
 195                }
 196
 197                if (!nouveau_bios_gpio_entry(dev, vidtag[i])) {
 198                        NV_DEBUG(dev, "vid bit %d has no gpio tag\n", i);
 199                        return;
 200                }
 201
 202                vidmask >>= 1;
 203                i++;
 204        }
 205
 206        /* parse vbios entries into common format */
 207        voltage->version = volt[0];
 208        if (voltage->version < 0x40) {
 209                voltage->nr_level = entries;
 210                voltage->level =
 211                        kcalloc(entries, sizeof(*voltage->level), GFP_KERNEL);
 212                if (!voltage->level)
 213                        return;
 214
 215                entry = volt + headerlen;
 216                for (i = 0; i < entries; i++, entry += recordlen) {
 217                        voltage->level[i].voltage = entry[0] * 10000;
 218                        voltage->level[i].vid     = entry[1] >> vidshift;
 219                }
 220        } else {
 221                u32 volt_uv = ROM32(volt[4]);
 222                s16 step_uv = ROM16(volt[8]);
 223                u8 vid;
 224
 225                voltage->nr_level = voltage->vid_mask + 1;
 226                voltage->level = kcalloc(voltage->nr_level,
 227                                         sizeof(*voltage->level), GFP_KERNEL);
 228                if (!voltage->level)
 229                        return;
 230
 231                for (vid = 0; vid <= voltage->vid_mask; vid++) {
 232                        voltage->level[vid].voltage = volt_uv;
 233                        voltage->level[vid].vid = vid;
 234                        volt_uv += step_uv;
 235                }
 236        }
 237
 238        voltage->supported = true;
 239}
 240
 241void
 242nouveau_volt_fini(struct drm_device *dev)
 243{
 244        struct drm_nouveau_private *dev_priv = dev->dev_private;
 245        struct nouveau_pm_voltage *volt = &dev_priv->engine.pm.voltage;
 246
 247        kfree(volt->level);
 248}
 249