drivers/gpu/drm/nouveau/nouveau_i2c.c

   1 /*
   2  * Copyright 2009 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 <linux/module.h>
  26
  27 #include "drmP.h"
  28 #include "nouveau_drv.h"
  29 #include "nouveau_i2c.h"
  30 #include "nouveau_hw.h"
  31
  32 static void
  33 nv04_i2c_setscl(void *data, int state)
  34 {
  35         struct nouveau_i2c_chan *i2c = data;
  36         struct drm_device *dev = i2c->dev;
  37         uint8_t val;
  38
  39         val = (NVReadVgaCrtc(dev, 0, i2c->wr) & 0xd0) | (state ? 0x20 : 0);
  40         NVWriteVgaCrtc(dev, 0, i2c->wr, val | 0x01);
  41 }
  42
  43 static void
  44 nv04_i2c_setsda(void *data, int state)
  45 {
  46         struct nouveau_i2c_chan *i2c = data;
  47         struct drm_device *dev = i2c->dev;
  48         uint8_t val;
  49
  50         val = (NVReadVgaCrtc(dev, 0, i2c->wr) & 0xe0) | (state ? 0x10 : 0);
  51         NVWriteVgaCrtc(dev, 0, i2c->wr, val | 0x01);
  52 }
  53
  54 static int
  55 nv04_i2c_getscl(void *data)
  56 {
  57         struct nouveau_i2c_chan *i2c = data;
  58         struct drm_device *dev = i2c->dev;
  59
  60         return !!(NVReadVgaCrtc(dev, 0, i2c->rd) & 4);
  61 }
  62
  63 static int
  64 nv04_i2c_getsda(void *data)
  65 {
  66         struct nouveau_i2c_chan *i2c = data;
  67         struct drm_device *dev = i2c->dev;
  68
  69         return !!(NVReadVgaCrtc(dev, 0, i2c->rd) & 8);
  70 }
  71
  72 static void
  73 nv4e_i2c_setscl(void *data, int state)
  74 {
  75         struct nouveau_i2c_chan *i2c = data;
  76         struct drm_device *dev = i2c->dev;
  77         uint8_t val;
  78
  79         val = (nv_rd32(dev, i2c->wr) & 0xd0) | (state ? 0x20 : 0);
  80         nv_wr32(dev, i2c->wr, val | 0x01);
  81 }
  82
  83 static void
  84 nv4e_i2c_setsda(void *data, int state)
  85 {
  86         struct nouveau_i2c_chan *i2c = data;
  87         struct drm_device *dev = i2c->dev;
  88         uint8_t val;
  89
  90         val = (nv_rd32(dev, i2c->wr) & 0xe0) | (state ? 0x10 : 0);
  91         nv_wr32(dev, i2c->wr, val | 0x01);
  92 }
  93
  94 static int
  95 nv4e_i2c_getscl(void *data)
  96 {
  97         struct nouveau_i2c_chan *i2c = data;
  98         struct drm_device *dev = i2c->dev;
  99
 100         return !!((nv_rd32(dev, i2c->rd) >> 16) & 4);
 101 }
 102
 103 static int
 104 nv4e_i2c_getsda(void *data)
 105 {
 106         struct nouveau_i2c_chan *i2c = data;
 107         struct drm_device *dev = i2c->dev;
 108
 109         return !!((nv_rd32(dev, i2c->rd) >> 16) & 8);
 110 }
 111
 112 static const uint32_t nv50_i2c_port[] = {
 113         0x00e138, 0x00e150, 0x00e168, 0x00e180,
 114         0x00e254, 0x00e274, 0x00e764, 0x00e780,
 115         0x00e79c, 0x00e7b8
 116 };
 117 #define NV50_I2C_PORTS ARRAY_SIZE(nv50_i2c_port)
 118
 119 static int
 120 nv50_i2c_getscl(void *data)
 121 {
 122         struct nouveau_i2c_chan *i2c = data;
 123         struct drm_device *dev = i2c->dev;
 124
 125         return !!(nv_rd32(dev, i2c->rd) & 1);
 126 }
 127
 128
 129 static int
 130 nv50_i2c_getsda(void *data)
 131 {
 132         struct nouveau_i2c_chan *i2c = data;
 133         struct drm_device *dev = i2c->dev;
 134
 135         return !!(nv_rd32(dev, i2c->rd) & 2);
 136 }
 137
 138 static void
 139 nv50_i2c_setscl(void *data, int state)
 140 {
 141         struct nouveau_i2c_chan *i2c = data;
 142
 143         nv_wr32(i2c->dev, i2c->wr, 4 | (i2c->data ? 2 : 0) | (state ? 1 : 0));
 144 }
 145
 146 static void
 147 nv50_i2c_setsda(void *data, int state)
 148 {
 149         struct nouveau_i2c_chan *i2c = data;
 150
 151         nv_mask(i2c->dev, i2c->wr, 0x00000006, 4 | (state ? 2 : 0));
 152         i2c->data = state;
 153 }
 154
 155 static int
 156 nvd0_i2c_getscl(void *data)
 157 {
 158         struct nouveau_i2c_chan *i2c = data;
 159         return !!(nv_rd32(i2c->dev, i2c->rd) & 0x10);
 160 }
 161
 162 static int
 163 nvd0_i2c_getsda(void *data)
 164 {
 165         struct nouveau_i2c_chan *i2c = data;
 166         return !!(nv_rd32(i2c->dev, i2c->rd) & 0x20);
 167 }
 168
 169 int
 170 nouveau_i2c_init(struct drm_device *dev, struct dcb_i2c_entry *entry, int index)
 171 {
 172         struct drm_nouveau_private *dev_priv = dev->dev_private;
 173         struct nouveau_i2c_chan *i2c;
 174         int ret;
 175
 176         if (entry->chan)
 177                 return -EEXIST;
 178
 179         if (dev_priv->card_type >= NV_50 &&
 180             dev_priv->card_type <= NV_C0 && entry->read >= NV50_I2C_PORTS) {
 181                 NV_ERROR(dev, "unknown i2c port %d\n", entry->read);
 182                 return -EINVAL;
 183         }
 184
 185         i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
 186         if (i2c == NULL)
 187                 return -ENOMEM;
 188
 189         switch (entry->port_type) {
 190         case 0:
 191                 i2c->bit.setsda = nv04_i2c_setsda;
 192                 i2c->bit.setscl = nv04_i2c_setscl;
 193                 i2c->bit.getsda = nv04_i2c_getsda;
 194                 i2c->bit.getscl = nv04_i2c_getscl;
 195                 i2c->rd = entry->read;
 196                 i2c->wr = entry->write;
 197                 break;
 198         case 4:
 199                 i2c->bit.setsda = nv4e_i2c_setsda;
 200                 i2c->bit.setscl = nv4e_i2c_setscl;
 201                 i2c->bit.getsda = nv4e_i2c_getsda;
 202                 i2c->bit.getscl = nv4e_i2c_getscl;
 203                 i2c->rd = 0x600800 + entry->read;
 204                 i2c->wr = 0x600800 + entry->write;
 205                 break;
 206         case 5:
 207                 i2c->bit.setsda = nv50_i2c_setsda;
 208                 i2c->bit.setscl = nv50_i2c_setscl;
 209                 if (dev_priv->card_type < NV_D0) {
 210                         i2c->bit.getsda = nv50_i2c_getsda;
 211                         i2c->bit.getscl = nv50_i2c_getscl;
 212                         i2c->rd = nv50_i2c_port[entry->read];
 213                         i2c->wr = i2c->rd;
 214                 } else {
 215                         i2c->bit.getsda = nvd0_i2c_getsda;
 216                         i2c->bit.getscl = nvd0_i2c_getscl;
 217                         i2c->rd = 0x00d014 + (entry->read * 0x20);
 218                         i2c->wr = i2c->rd;
 219                 }
 220                 break;
 221         case 6:
 222                 i2c->rd = entry->read;
 223                 i2c->wr = entry->write;
 224                 break;
 225         default:
 226                 NV_ERROR(dev, "DCB I2C port type %d unknown\n",
 227                          entry->port_type);
 228                 kfree(i2c);
 229                 return -EINVAL;
 230         }
 231
 232         snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
 233                  "nouveau-%s-%d", pci_name(dev->pdev), index);
 234         i2c->adapter.owner = THIS_MODULE;
 235         i2c->adapter.dev.parent = &dev->pdev->dev;
 236         i2c->dev = dev;
 237         i2c_set_adapdata(&i2c->adapter, i2c);
 238
 239         if (entry->port_type < 6) {
 240                 i2c->adapter.algo_data = &i2c->bit;
 241                 i2c->bit.udelay = 40;
 242                 i2c->bit.timeout = usecs_to_jiffies(5000);
 243                 i2c->bit.data = i2c;
 244                 ret = i2c_bit_add_bus(&i2c->adapter);
 245         } else {
 246                 i2c->adapter.algo = &nouveau_dp_i2c_algo;
 247                 ret = i2c_add_adapter(&i2c->adapter);
 248         }
 249
 250         if (ret) {
 251                 NV_ERROR(dev, "Failed to register i2c %d\n", index);
 252                 kfree(i2c);
 253                 return ret;
 254         }
 255
 256         entry->chan = i2c;
 257         return 0;
 258 }
 259
 260 void
 261 nouveau_i2c_fini(struct drm_device *dev, struct dcb_i2c_entry *entry)
 262 {
 263         if (!entry->chan)
 264                 return;
 265
 266         i2c_del_adapter(&entry->chan->adapter);
 267         kfree(entry->chan);
 268         entry->chan = NULL;
 269 }
 270
 271 struct nouveau_i2c_chan *
 272 nouveau_i2c_find(struct drm_device *dev, int index)
 273 {
 274         struct drm_nouveau_private *dev_priv = dev->dev_private;
 275         struct dcb_i2c_entry *i2c = &dev_priv->vbios.dcb.i2c[index];
 276
 277         if (index >= DCB_MAX_NUM_I2C_ENTRIES)
 278                 return NULL;
 279
 280         if (dev_priv->card_type >= NV_50 && (i2c->entry & 0x00000100)) {
 281                 uint32_t reg = 0xe500, val;
 282
 283                 if (i2c->port_type == 6) {
 284                         reg += i2c->read * 0x50;
 285                         val  = 0x2002;
 286                 } else {
 287                         reg += ((i2c->entry & 0x1e00) >> 9) * 0x50;
 288                         val  = 0xe001;
 289                 }
 290
 291                 /* nfi, but neither auxch or i2c work if it's 1 */
 292                 nv_mask(dev, reg + 0x0c, 0x00000001, 0x00000000);
 293                 /* nfi, but switches auxch vs normal i2c */
 294                 nv_mask(dev, reg + 0x00, 0x0000f003, val);
 295         }
 296
 297         if (!i2c->chan && nouveau_i2c_init(dev, i2c, index))
 298                 return NULL;
 299         return i2c->chan;
 300 }
 301
 302 bool
 303 nouveau_probe_i2c_addr(struct nouveau_i2c_chan *i2c, int addr)
 304 {
 305         uint8_t buf[] = { 0 };
 306         struct i2c_msg msgs[] = {
 307                 {
 308                         .addr = addr,
 309                         .flags = 0,
 310                         .len = 1,
 311                         .buf = buf,
 312                 },
 313                 {
 314                         .addr = addr,
 315                         .flags = I2C_M_RD,
 316                         .len = 1,
 317                         .buf = buf,
 318                 }
 319         };
 320
 321         return i2c_transfer(&i2c->adapter, msgs, 2) == 2;
 322 }
 323
 324 int
 325 nouveau_i2c_identify(struct drm_device *dev, const char *what,
 326                      struct i2c_board_info *info,
 327                      bool (*match)(struct nouveau_i2c_chan *,
 328                                    struct i2c_board_info *),
 329                      int index)
 330 {
 331         struct nouveau_i2c_chan *i2c = nouveau_i2c_find(dev, index);
 332         int i;
 333
 334         NV_DEBUG(dev, "Probing %ss on I2C bus: %d\n", what, index);
 335
 336         for (i = 0; i2c && info[i].addr; i++) {
 337                 if (nouveau_probe_i2c_addr(i2c, info[i].addr) &&
 338                     (!match || match(i2c, &info[i]))) {
 339                         NV_INFO(dev, "Detected %s: %s\n", what, info[i].type);
 340                         return i;
 341                 }
 342         }
 343
 344         NV_DEBUG(dev, "No devices found.\n");
 345
 346         return -ENODEV;
 347 }