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 int
 111 nv50_i2c_getscl(void *data)
 112 {
 113         struct nouveau_i2c_chan *i2c = data;
 114         struct drm_device *dev = i2c->dev;
 115
 116         return !!(nv_rd32(dev, i2c->rd) & 1);
 117 }
 118
 119
 120 static int
 121 nv50_i2c_getsda(void *data)
 122 {
 123         struct nouveau_i2c_chan *i2c = data;
 124         struct drm_device *dev = i2c->dev;
 125
 126         return !!(nv_rd32(dev, i2c->rd) & 2);
 127 }
 128
 129 static void
 130 nv50_i2c_setscl(void *data, int state)
 131 {
 132         struct nouveau_i2c_chan *i2c = data;
 133         struct drm_device *dev = i2c->dev;
 134
 135         nv_wr32(dev, i2c->wr, 4 | (i2c->data ? 2 : 0) | (state ? 1 : 0));
 136 }
 137
 138 static void
 139 nv50_i2c_setsda(void *data, int state)
 140 {
 141         struct nouveau_i2c_chan *i2c = data;
 142         struct drm_device *dev = i2c->dev;
 143
 144         nv_wr32(dev, i2c->wr,
 145                         (nv_rd32(dev, i2c->rd) & 1) | 4 | (state ? 2 : 0));
 146         i2c->data = state;
 147 }
 148
 149 static const uint32_t nv50_i2c_port[] = {
 150         0x00e138, 0x00e150, 0x00e168, 0x00e180,
 151         0x00e254, 0x00e274, 0x00e764, 0x00e780,
 152         0x00e79c, 0x00e7b8
 153 };
 154 #define NV50_I2C_PORTS ARRAY_SIZE(nv50_i2c_port)
 155
 156 int
 157 nouveau_i2c_init(struct drm_device *dev, struct dcb_i2c_entry *entry, int index)
 158 {
 159         struct drm_nouveau_private *dev_priv = dev->dev_private;
 160         struct nouveau_i2c_chan *i2c;
 161         int ret;
 162
 163         if (entry->chan)
 164                 return -EEXIST;
 165
 166         if (dev_priv->card_type >= NV_50 && entry->read >= NV50_I2C_PORTS) {
 167                 NV_ERROR(dev, "unknown i2c port %d\n", entry->read);
 168                 return -EINVAL;
 169         }
 170
 171         i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
 172         if (i2c == NULL)
 173                 return -ENOMEM;
 174
 175         switch (entry->port_type) {
 176         case 0:
 177                 i2c->bit.setsda = nv04_i2c_setsda;
 178                 i2c->bit.setscl = nv04_i2c_setscl;
 179                 i2c->bit.getsda = nv04_i2c_getsda;
 180                 i2c->bit.getscl = nv04_i2c_getscl;
 181                 i2c->rd = entry->read;
 182                 i2c->wr = entry->write;
 183                 break;
 184         case 4:
 185                 i2c->bit.setsda = nv4e_i2c_setsda;
 186                 i2c->bit.setscl = nv4e_i2c_setscl;
 187                 i2c->bit.getsda = nv4e_i2c_getsda;
 188                 i2c->bit.getscl = nv4e_i2c_getscl;
 189                 i2c->rd = 0x600800 + entry->read;
 190                 i2c->wr = 0x600800 + entry->write;
 191                 break;
 192         case 5:
 193                 i2c->bit.setsda = nv50_i2c_setsda;
 194                 i2c->bit.setscl = nv50_i2c_setscl;
 195                 i2c->bit.getsda = nv50_i2c_getsda;
 196                 i2c->bit.getscl = nv50_i2c_getscl;
 197                 i2c->rd = nv50_i2c_port[entry->read];
 198                 i2c->wr = i2c->rd;
 199                 break;
 200         case 6:
 201                 i2c->rd = entry->read;
 202                 i2c->wr = entry->write;
 203                 break;
 204         default:
 205                 NV_ERROR(dev, "DCB I2C port type %d unknown\n",
 206                          entry->port_type);
 207                 kfree(i2c);
 208                 return -EINVAL;
 209         }
 210
 211         snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
 212                  "nouveau-%s-%d", pci_name(dev->pdev), index);
 213         i2c->adapter.owner = THIS_MODULE;
 214         i2c->adapter.dev.parent = &dev->pdev->dev;
 215         i2c->dev = dev;
 216         i2c_set_adapdata(&i2c->adapter, i2c);
 217
 218         if (entry->port_type < 6) {
 219                 i2c->adapter.algo_data = &i2c->bit;
 220                 i2c->bit.udelay = 40;
 221                 i2c->bit.timeout = usecs_to_jiffies(5000);
 222                 i2c->bit.data = i2c;
 223                 ret = i2c_bit_add_bus(&i2c->adapter);
 224         } else {
 225                 i2c->adapter.algo = &nouveau_dp_i2c_algo;
 226                 ret = i2c_add_adapter(&i2c->adapter);
 227         }
 228
 229         if (ret) {
 230                 NV_ERROR(dev, "Failed to register i2c %d\n", index);
 231                 kfree(i2c);
 232                 return ret;
 233         }
 234
 235         entry->chan = i2c;
 236         return 0;
 237 }
 238
 239 void
 240 nouveau_i2c_fini(struct drm_device *dev, struct dcb_i2c_entry *entry)
 241 {
 242         if (!entry->chan)
 243                 return;
 244
 245         i2c_del_adapter(&entry->chan->adapter);
 246         kfree(entry->chan);
 247         entry->chan = NULL;
 248 }
 249
 250 struct nouveau_i2c_chan *
 251 nouveau_i2c_find(struct drm_device *dev, int index)
 252 {
 253         struct drm_nouveau_private *dev_priv = dev->dev_private;
 254         struct dcb_i2c_entry *i2c = &dev_priv->vbios.dcb.i2c[index];
 255
 256         if (index >= DCB_MAX_NUM_I2C_ENTRIES)
 257                 return NULL;
 258
 259         if (dev_priv->card_type >= NV_50 && (i2c->entry & 0x00000100)) {
 260                 uint32_t reg = 0xe500, val;
 261
 262                 if (i2c->port_type == 6) {
 263                         reg += i2c->read * 0x50;
 264                         val  = 0x2002;
 265                 } else {
 266                         reg += ((i2c->entry & 0x1e00) >> 9) * 0x50;
 267                         val  = 0xe001;
 268                 }
 269
 270                 nv_wr32(dev, reg, (nv_rd32(dev, reg) & ~0xf003) | val);
 271         }
 272
 273         if (!i2c->chan && nouveau_i2c_init(dev, i2c, index))
 274                 return NULL;
 275         return i2c->chan;
 276 }
 277
 278 bool
 279 nouveau_probe_i2c_addr(struct nouveau_i2c_chan *i2c, int addr)
 280 {
 281         uint8_t buf[] = { 0 };
 282         struct i2c_msg msgs[] = {
 283                 {
 284                         .addr = addr,
 285                         .flags = 0,
 286                         .len = 1,
 287                         .buf = buf,
 288                 },
 289                 {
 290                         .addr = addr,
 291                         .flags = I2C_M_RD,
 292                         .len = 1,
 293                         .buf = buf,
 294                 }
 295         };
 296
 297         return i2c_transfer(&i2c->adapter, msgs, 2) == 2;
 298 }
 299
 300 int
 301 nouveau_i2c_identify(struct drm_device *dev, const char *what,
 302                      struct i2c_board_info *info,
 303                      bool (*match)(struct nouveau_i2c_chan *,
 304                                    struct i2c_board_info *),
 305                      int index)
 306 {
 307         struct nouveau_i2c_chan *i2c = nouveau_i2c_find(dev, index);
 308         int i;
 309
 310         NV_DEBUG(dev, "Probing %ss on I2C bus: %d\n", what, index);
 311
 312         for (i = 0; info[i].addr; i++) {
 313                 if (nouveau_probe_i2c_addr(i2c, info[i].addr) &&
 314                     (!match || match(i2c, &info[i]))) {
 315                         NV_INFO(dev, "Detected %s: %s\n", what, info[i].type);
 316                         return i;
 317                 }
 318         }
 319
 320         NV_DEBUG(dev, "No devices found.\n");
 321
 322         return -ENODEV;
 323 }