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