drivers/gpu/drm/i915/dvo_ch7xxx.c

   1 /**************************************************************************
   2
   3 Copyright © 2006 Dave Airlie
   4
   5 All Rights Reserved.
   6
   7 Permission is hereby granted, free of charge, to any person obtaining a
   8 copy of this software and associated documentation files (the
   9 "Software"), to deal in the Software without restriction, including
  10 without limitation the rights to use, copy, modify, merge, publish,
  11 distribute, sub license, and/or sell copies of the Software, and to
  12 permit persons to whom the Software is furnished to do so, subject to
  13 the following conditions:
  14
  15 The above copyright notice and this permission notice (including the
  16 next paragraph) shall be included in all copies or substantial portions
  17 of the Software.
  18
  19 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20 OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  23 ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24 TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25 SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26
  27 **************************************************************************/
  28
  29 #include "dvo.h"
  30
  31 #define CH7xxx_REG_VID          0x4a
  32 #define CH7xxx_REG_DID          0x4b
  33
  34 #define CH7011_VID              0x83 /* 7010 as well */
  35 #define CH7010B_VID             0x05
  36 #define CH7009A_VID             0x84
  37 #define CH7009B_VID             0x85
  38 #define CH7301_VID              0x95
  39
  40 #define CH7xxx_VID              0x84
  41 #define CH7xxx_DID              0x17
  42 #define CH7010_DID              0x16
  43
  44 #define CH7xxx_NUM_REGS         0x4c
  45
  46 #define CH7xxx_CM               0x1c
  47 #define CH7xxx_CM_XCM           (1<<0)
  48 #define CH7xxx_CM_MCP           (1<<2)
  49 #define CH7xxx_INPUT_CLOCK      0x1d
  50 #define CH7xxx_GPIO             0x1e
  51 #define CH7xxx_GPIO_HPIR        (1<<3)
  52 #define CH7xxx_IDF              0x1f
  53
  54 #define CH7xxx_IDF_HSP          (1<<3)
  55 #define CH7xxx_IDF_VSP          (1<<4)
  56
  57 #define CH7xxx_CONNECTION_DETECT 0x20
  58 #define CH7xxx_CDET_DVI         (1<<5)
  59
  60 #define CH7301_DAC_CNTL         0x21
  61 #define CH7301_HOTPLUG          0x23
  62 #define CH7xxx_TCTL             0x31
  63 #define CH7xxx_TVCO             0x32
  64 #define CH7xxx_TPCP             0x33
  65 #define CH7xxx_TPD              0x34
  66 #define CH7xxx_TPVT             0x35
  67 #define CH7xxx_TLPF             0x36
  68 #define CH7xxx_TCT              0x37
  69 #define CH7301_TEST_PATTERN     0x48
  70
  71 #define CH7xxx_PM               0x49
  72 #define CH7xxx_PM_FPD           (1<<0)
  73 #define CH7301_PM_DACPD0        (1<<1)
  74 #define CH7301_PM_DACPD1        (1<<2)
  75 #define CH7301_PM_DACPD2        (1<<3)
  76 #define CH7xxx_PM_DVIL          (1<<6)
  77 #define CH7xxx_PM_DVIP          (1<<7)
  78
  79 #define CH7301_SYNC_POLARITY    0x56
  80 #define CH7301_SYNC_RGB_YUV     (1<<0)
  81 #define CH7301_SYNC_POL_DVI     (1<<5)
  82
  83 /** @file
  84  * driver for the Chrontel 7xxx DVI chip over DVO.
  85  */
  86
  87 static struct ch7xxx_id_struct {
  88         u8 vid;
  89         char *name;
  90 } ch7xxx_ids[] = {
  91         { CH7011_VID, "CH7011" },
  92         { CH7010B_VID, "CH7010B" },
  93         { CH7009A_VID, "CH7009A" },
  94         { CH7009B_VID, "CH7009B" },
  95         { CH7301_VID, "CH7301" },
  96 };
  97
  98 static struct ch7xxx_did_struct {
  99         u8 did;
 100         char *name;
 101 } ch7xxx_dids[] = {
 102         { CH7xxx_DID, "CH7XXX" },
 103         { CH7010_DID, "CH7010B" },
 104 };
 105
 106 struct ch7xxx_priv {
 107         bool quiet;
 108 };
 109
 110 static char *ch7xxx_get_id(u8 vid)
 111 {
 112         int i;
 113
 114         for (i = 0; i < ARRAY_SIZE(ch7xxx_ids); i++) {
 115                 if (ch7xxx_ids[i].vid == vid)
 116                         return ch7xxx_ids[i].name;
 117         }
 118
 119         return NULL;
 120 }
 121
 122 static char *ch7xxx_get_did(u8 did)
 123 {
 124         int i;
 125
 126         for (i = 0; i < ARRAY_SIZE(ch7xxx_dids); i++) {
 127                 if (ch7xxx_dids[i].did == did)
 128                         return ch7xxx_dids[i].name;
 129         }
 130
 131         return NULL;
 132 }
 133
 134 /** Reads an 8 bit register */
 135 static bool ch7xxx_readb(struct intel_dvo_device *dvo, int addr, u8 *ch)
 136 {
 137         struct ch7xxx_priv *ch7xxx = dvo->dev_priv;
 138         struct i2c_adapter *adapter = dvo->i2c_bus;
 139         u8 out_buf[2];
 140         u8 in_buf[2];
 141
 142         struct i2c_msg msgs[] = {
 143                 {
 144                         .addr = dvo->slave_addr,
 145                         .flags = 0,
 146                         .len = 1,
 147                         .buf = out_buf,
 148                 },
 149                 {
 150                         .addr = dvo->slave_addr,
 151                         .flags = I2C_M_RD,
 152                         .len = 1,
 153                         .buf = in_buf,
 154                 }
 155         };
 156
 157         out_buf[0] = addr;
 158         out_buf[1] = 0;
 159
 160         if (i2c_transfer(adapter, msgs, 2) == 2) {
 161                 *ch = in_buf[0];
 162                 return true;
 163         }
 164
 165         if (!ch7xxx->quiet) {
 166                 DRM_DEBUG_KMS("Unable to read register 0x%02x from %s:%02x.\n",
 167                           addr, adapter->name, dvo->slave_addr);
 168         }
 169         return false;
 170 }
 171
 172 /** Writes an 8 bit register */
 173 static bool ch7xxx_writeb(struct intel_dvo_device *dvo, int addr, u8 ch)
 174 {
 175         struct ch7xxx_priv *ch7xxx = dvo->dev_priv;
 176         struct i2c_adapter *adapter = dvo->i2c_bus;
 177         u8 out_buf[2];
 178         struct i2c_msg msg = {
 179                 .addr = dvo->slave_addr,
 180                 .flags = 0,
 181                 .len = 2,
 182                 .buf = out_buf,
 183         };
 184
 185         out_buf[0] = addr;
 186         out_buf[1] = ch;
 187
 188         if (i2c_transfer(adapter, &msg, 1) == 1)
 189                 return true;
 190
 191         if (!ch7xxx->quiet) {
 192                 DRM_DEBUG_KMS("Unable to write register 0x%02x to %s:%d.\n",
 193                           addr, adapter->name, dvo->slave_addr);
 194         }
 195
 196         return false;
 197 }
 198
 199 static bool ch7xxx_init(struct intel_dvo_device *dvo,
 200                         struct i2c_adapter *adapter)
 201 {
 202         /* this will detect the CH7xxx chip on the specified i2c bus */
 203         struct ch7xxx_priv *ch7xxx;
 204         u8 vendor, device;
 205         char *name, *devid;
 206
 207         ch7xxx = kzalloc(sizeof(struct ch7xxx_priv), GFP_KERNEL);
 208         if (ch7xxx == NULL)
 209                 return false;
 210
 211         dvo->i2c_bus = adapter;
 212         dvo->dev_priv = ch7xxx;
 213         ch7xxx->quiet = true;
 214
 215         if (!ch7xxx_readb(dvo, CH7xxx_REG_VID, &vendor))
 216                 goto out;
 217
 218         name = ch7xxx_get_id(vendor);
 219         if (!name) {
 220                 DRM_DEBUG_KMS("ch7xxx not detected; got VID 0x%02x from %s slave %d.\n",
 221                               vendor, adapter->name, dvo->slave_addr);
 222                 goto out;
 223         }
 224
 225
 226         if (!ch7xxx_readb(dvo, CH7xxx_REG_DID, &device))
 227                 goto out;
 228
 229         devid = ch7xxx_get_did(device);
 230         if (!devid) {
 231                 DRM_DEBUG_KMS("ch7xxx not detected; got DID 0x%02x from %s slave %d.\n",
 232                               device, adapter->name, dvo->slave_addr);
 233                 goto out;
 234         }
 235
 236         ch7xxx->quiet = false;
 237         DRM_DEBUG_KMS("Detected %s chipset, vendor/device ID 0x%02x/0x%02x\n",
 238                   name, vendor, device);
 239         return true;
 240 out:
 241         kfree(ch7xxx);
 242         return false;
 243 }
 244
 245 static enum drm_connector_status ch7xxx_detect(struct intel_dvo_device *dvo)
 246 {
 247         u8 cdet, orig_pm, pm;
 248
 249         ch7xxx_readb(dvo, CH7xxx_PM, &orig_pm);
 250
 251         pm = orig_pm;
 252         pm &= ~CH7xxx_PM_FPD;
 253         pm |= CH7xxx_PM_DVIL | CH7xxx_PM_DVIP;
 254
 255         ch7xxx_writeb(dvo, CH7xxx_PM, pm);
 256
 257         ch7xxx_readb(dvo, CH7xxx_CONNECTION_DETECT, &cdet);
 258
 259         ch7xxx_writeb(dvo, CH7xxx_PM, orig_pm);
 260
 261         if (cdet & CH7xxx_CDET_DVI)
 262                 return connector_status_connected;
 263         return connector_status_disconnected;
 264 }
 265
 266 static enum drm_mode_status ch7xxx_mode_valid(struct intel_dvo_device *dvo,
 267                                               struct drm_display_mode *mode)
 268 {
 269         if (mode->clock > 165000)
 270                 return MODE_CLOCK_HIGH;
 271
 272         return MODE_OK;
 273 }
 274
 275 static void ch7xxx_mode_set(struct intel_dvo_device *dvo,
 276                             const struct drm_display_mode *mode,
 277                             const struct drm_display_mode *adjusted_mode)
 278 {
 279         u8 tvco, tpcp, tpd, tlpf, idf;
 280
 281         if (mode->clock <= 65000) {
 282                 tvco = 0x23;
 283                 tpcp = 0x08;
 284                 tpd = 0x16;
 285                 tlpf = 0x60;
 286         } else {
 287                 tvco = 0x2d;
 288                 tpcp = 0x06;
 289                 tpd = 0x26;
 290                 tlpf = 0xa0;
 291         }
 292
 293         ch7xxx_writeb(dvo, CH7xxx_TCTL, 0x00);
 294         ch7xxx_writeb(dvo, CH7xxx_TVCO, tvco);
 295         ch7xxx_writeb(dvo, CH7xxx_TPCP, tpcp);
 296         ch7xxx_writeb(dvo, CH7xxx_TPD, tpd);
 297         ch7xxx_writeb(dvo, CH7xxx_TPVT, 0x30);
 298         ch7xxx_writeb(dvo, CH7xxx_TLPF, tlpf);
 299         ch7xxx_writeb(dvo, CH7xxx_TCT, 0x00);
 300
 301         ch7xxx_readb(dvo, CH7xxx_IDF, &idf);
 302
 303         idf &= ~(CH7xxx_IDF_HSP | CH7xxx_IDF_VSP);
 304         if (mode->flags & DRM_MODE_FLAG_PHSYNC)
 305                 idf |= CH7xxx_IDF_HSP;
 306
 307         if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 308                 idf |= CH7xxx_IDF_VSP;
 309
 310         ch7xxx_writeb(dvo, CH7xxx_IDF, idf);
 311 }
 312
 313 /* set the CH7xxx power state */
 314 static void ch7xxx_dpms(struct intel_dvo_device *dvo, bool enable)
 315 {
 316         if (enable)
 317                 ch7xxx_writeb(dvo, CH7xxx_PM, CH7xxx_PM_DVIL | CH7xxx_PM_DVIP);
 318         else
 319                 ch7xxx_writeb(dvo, CH7xxx_PM, CH7xxx_PM_FPD);
 320 }
 321
 322 static bool ch7xxx_get_hw_state(struct intel_dvo_device *dvo)
 323 {
 324         u8 val;
 325
 326         ch7xxx_readb(dvo, CH7xxx_PM, &val);
 327
 328         if (val & (CH7xxx_PM_DVIL | CH7xxx_PM_DVIP))
 329                 return true;
 330         else
 331                 return false;
 332 }
 333
 334 static void ch7xxx_dump_regs(struct intel_dvo_device *dvo)
 335 {
 336         int i;
 337
 338         for (i = 0; i < CH7xxx_NUM_REGS; i++) {
 339                 u8 val;
 340                 if ((i % 8) == 0)
 341                         DRM_DEBUG_KMS("\n %02X: ", i);
 342                 ch7xxx_readb(dvo, i, &val);
 343                 DRM_DEBUG_KMS("%02X ", val);
 344         }
 345 }
 346
 347 static void ch7xxx_destroy(struct intel_dvo_device *dvo)
 348 {
 349         struct ch7xxx_priv *ch7xxx = dvo->dev_priv;
 350
 351         if (ch7xxx) {
 352                 kfree(ch7xxx);
 353                 dvo->dev_priv = NULL;
 354         }
 355 }
 356
 357 const struct intel_dvo_dev_ops ch7xxx_ops = {
 358         .init = ch7xxx_init,
 359         .detect = ch7xxx_detect,
 360         .mode_valid = ch7xxx_mode_valid,
 361         .mode_set = ch7xxx_mode_set,
 362         .dpms = ch7xxx_dpms,
 363         .get_hw_state = ch7xxx_get_hw_state,
 364         .dump_regs = ch7xxx_dump_regs,
 365         .destroy = ch7xxx_destroy,
 366 };