kernel/drivers/staging/sm750fb/ddk750_sii164.c

   1 #define USE_DVICHIP
   2 #ifdef USE_DVICHIP
   3
   4 #include "ddk750_sii164.h"
   5 #include "ddk750_hwi2c.h"
   6
   7 /* I2C Address of each SII164 chip */
   8 #define SII164_I2C_ADDRESS                  0x70
   9
  10 /* Define this definition to use hardware i2c. */
  11 #define USE_HW_I2C
  12
  13 #ifdef USE_HW_I2C
  14     #define i2cWriteReg sm750_hw_i2c_write_reg
  15     #define i2cReadReg  sm750_hw_i2c_read_reg
  16 #else
  17     #define i2cWriteReg swI2CWriteReg
  18     #define i2cReadReg  swI2CReadReg
  19 #endif
  20
  21 /* SII164 Vendor and Device ID */
  22 #define SII164_VENDOR_ID                    0x0001
  23 #define SII164_DEVICE_ID                    0x0006
  24
  25 #ifdef SII164_FULL_FUNCTIONS
  26 /* Name of the DVI Controller chip */
  27 static char *gDviCtrlChipName = "Silicon Image SiI 164";
  28 #endif
  29
  30 /*
  31  *  sii164GetVendorID
  32  *      This function gets the vendor ID of the DVI controller chip.
  33  *
  34  *  Output:
  35  *      Vendor ID
  36  */
  37 unsigned short sii164GetVendorID(void)
  38 {
  39         unsigned short vendorID;
  40
  41         vendorID = ((unsigned short) i2cReadReg(SII164_I2C_ADDRESS, SII164_VENDOR_ID_HIGH) << 8) |
  42                     (unsigned short) i2cReadReg(SII164_I2C_ADDRESS, SII164_VENDOR_ID_LOW);
  43
  44         return vendorID;
  45 }
  46
  47 /*
  48  *  sii164GetDeviceID
  49  *      This function gets the device ID of the DVI controller chip.
  50  *
  51  *  Output:
  52  *      Device ID
  53  */
  54 unsigned short sii164GetDeviceID(void)
  55 {
  56         unsigned short deviceID;
  57
  58         deviceID = ((unsigned short) i2cReadReg(SII164_I2C_ADDRESS, SII164_DEVICE_ID_HIGH) << 8) |
  59                     (unsigned short) i2cReadReg(SII164_I2C_ADDRESS, SII164_DEVICE_ID_LOW);
  60
  61         return deviceID;
  62 }
  63
  64
  65
  66 /* DVI.C will handle all SiI164 chip stuffs and try it best to make code minimal and useful */
  67
  68 /*
  69  *  sii164InitChip
  70  *      This function initialize and detect the DVI controller chip.
  71  *
  72  *  Input:
  73  *      edgeSelect          - Edge Select:
  74  *                              0 = Input data is falling edge latched (falling edge
  75  *                                  latched first in dual edge mode)
  76  *                              1 = Input data is rising edge latched (rising edge
  77  *                                  latched first in dual edge mode)
  78  *      busSelect           - Input Bus Select:
  79  *                              0 = Input data bus is 12-bits wide
  80  *                              1 = Input data bus is 24-bits wide
  81  *      dualEdgeClkSelect   - Dual Edge Clock Select
  82  *                              0 = Input data is single edge latched
  83  *                              1 = Input data is dual edge latched
  84  *      hsyncEnable         - Horizontal Sync Enable:
  85  *                              0 = HSYNC input is transmitted as fixed LOW
  86  *                              1 = HSYNC input is transmitted as is
  87  *      vsyncEnable         - Vertical Sync Enable:
  88  *                              0 = VSYNC input is transmitted as fixed LOW
  89  *                              1 = VSYNC input is transmitted as is
  90  *      deskewEnable        - De-skewing Enable:
  91  *                              0 = De-skew disabled
  92  *                              1 = De-skew enabled
  93  *      deskewSetting       - De-skewing Setting (increment of 260psec)
  94  *                              0 = 1 step --> minimum setup / maximum hold
  95  *                              1 = 2 step
  96  *                              2 = 3 step
  97  *                              3 = 4 step
  98  *                              4 = 5 step
  99  *                              5 = 6 step
 100  *                              6 = 7 step
 101  *                              7 = 8 step --> maximum setup / minimum hold
 102  *      continuousSyncEnable- SYNC Continuous:
 103  *                              0 = Disable
 104  *                              1 = Enable
 105  *      pllFilterEnable     - PLL Filter Enable
 106  *                              0 = Disable PLL Filter
 107  *                              1 = Enable PLL Filter
 108  *      pllFilterValue      - PLL Filter characteristics:
 109  *                              0~7 (recommended value is 4)
 110  *
 111  *  Output:
 112  *      0   - Success
 113  *     -1   - Fail.
 114  */
 115 long sii164InitChip(
 116         unsigned char edgeSelect,
 117         unsigned char busSelect,
 118         unsigned char dualEdgeClkSelect,
 119         unsigned char hsyncEnable,
 120         unsigned char vsyncEnable,
 121         unsigned char deskewEnable,
 122         unsigned char deskewSetting,
 123         unsigned char continuousSyncEnable,
 124         unsigned char pllFilterEnable,
 125         unsigned char pllFilterValue
 126 )
 127 {
 128         unsigned char config;
 129
 130         /* Initialize the i2c bus */
 131 #ifdef USE_HW_I2C
 132         /* Use fast mode. */
 133         sm750_hw_i2c_init(1);
 134 #else
 135         sm750_sw_i2c_init(DEFAULT_I2C_SCL, DEFAULT_I2C_SDA);
 136 #endif
 137
 138         /* Check if SII164 Chip exists */
 139         if ((sii164GetVendorID() == SII164_VENDOR_ID) && (sii164GetDeviceID() == SII164_DEVICE_ID)) {
 140                 /*
 141                  *  Initialize SII164 controller chip.
 142                  */
 143
 144                 /* Select the edge */
 145                 if (edgeSelect == 0)
 146                         config = SII164_CONFIGURATION_LATCH_FALLING;
 147                 else
 148                         config = SII164_CONFIGURATION_LATCH_RISING;
 149
 150                 /* Select bus wide */
 151                 if (busSelect == 0)
 152                         config |= SII164_CONFIGURATION_BUS_12BITS;
 153                 else
 154                         config |= SII164_CONFIGURATION_BUS_24BITS;
 155
 156                 /* Select Dual/Single Edge Clock */
 157                 if (dualEdgeClkSelect == 0)
 158                         config |= SII164_CONFIGURATION_CLOCK_SINGLE;
 159                 else
 160                         config |= SII164_CONFIGURATION_CLOCK_DUAL;
 161
 162                 /* Select HSync Enable */
 163                 if (hsyncEnable == 0)
 164                         config |= SII164_CONFIGURATION_HSYNC_FORCE_LOW;
 165                 else
 166                         config |= SII164_CONFIGURATION_HSYNC_AS_IS;
 167
 168                 /* Select VSync Enable */
 169                 if (vsyncEnable == 0)
 170                         config |= SII164_CONFIGURATION_VSYNC_FORCE_LOW;
 171                 else
 172                         config |= SII164_CONFIGURATION_VSYNC_AS_IS;
 173
 174                 i2cWriteReg(SII164_I2C_ADDRESS, SII164_CONFIGURATION, config);
 175
 176                 /* De-skew enabled with default 111b value.
 177                    This will fix some artifacts problem in some mode on board 2.2.
 178                    Somehow this fix does not affect board 2.1.
 179                  */
 180                 if (deskewEnable == 0)
 181                         config = SII164_DESKEW_DISABLE;
 182                 else
 183                         config = SII164_DESKEW_ENABLE;
 184
 185                 switch (deskewSetting) {
 186                 case 0:
 187                         config |= SII164_DESKEW_1_STEP;
 188                         break;
 189                 case 1:
 190                         config |= SII164_DESKEW_2_STEP;
 191                         break;
 192                 case 2:
 193                         config |= SII164_DESKEW_3_STEP;
 194                         break;
 195                 case 3:
 196                         config |= SII164_DESKEW_4_STEP;
 197                         break;
 198                 case 4:
 199                         config |= SII164_DESKEW_5_STEP;
 200                         break;
 201                 case 5:
 202                         config |= SII164_DESKEW_6_STEP;
 203                         break;
 204                 case 6:
 205                         config |= SII164_DESKEW_7_STEP;
 206                         break;
 207                 case 7:
 208                         config |= SII164_DESKEW_8_STEP;
 209                         break;
 210                 }
 211                 i2cWriteReg(SII164_I2C_ADDRESS, SII164_DESKEW, config);
 212
 213                 /* Enable/Disable Continuous Sync. */
 214                 if (continuousSyncEnable == 0)
 215                         config = SII164_PLL_FILTER_SYNC_CONTINUOUS_DISABLE;
 216                 else
 217                         config = SII164_PLL_FILTER_SYNC_CONTINUOUS_ENABLE;
 218
 219                 /* Enable/Disable PLL Filter */
 220                 if (pllFilterEnable == 0)
 221                         config |= SII164_PLL_FILTER_DISABLE;
 222                 else
 223                         config |= SII164_PLL_FILTER_ENABLE;
 224
 225                 /* Set the PLL Filter value */
 226                 config |= ((pllFilterValue & 0x07) << 1);
 227
 228                 i2cWriteReg(SII164_I2C_ADDRESS, SII164_PLL, config);
 229
 230                 /* Recover from Power Down and enable output. */
 231                 config = i2cReadReg(SII164_I2C_ADDRESS, SII164_CONFIGURATION);
 232                 config |= SII164_CONFIGURATION_POWER_NORMAL;
 233                 i2cWriteReg(SII164_I2C_ADDRESS, SII164_CONFIGURATION, config);
 234
 235                 return 0;
 236         }
 237
 238         /* Return -1 if initialization fails. */
 239         return (-1);
 240 }
 241
 242
 243
 244
 245
 246 /* below sii164 function is not necessary */
 247
 248 #ifdef SII164_FULL_FUNCTIONS
 249
 250 /*
 251  *  sii164ResetChip
 252  *      This function resets the DVI Controller Chip.
 253  */
 254 void sii164ResetChip(void)
 255 {
 256         /* Power down */
 257         sii164SetPower(0);
 258         sii164SetPower(1);
 259 }
 260
 261
 262 /*
 263  * sii164GetChipString
 264  *      This function returns a char string name of the current DVI Controller chip.
 265  *      It's convenient for application need to display the chip name.
 266  */
 267 char *sii164GetChipString(void)
 268 {
 269         return gDviCtrlChipName;
 270 }
 271
 272
 273 /*
 274  *  sii164SetPower
 275  *      This function sets the power configuration of the DVI Controller Chip.
 276  *
 277  *  Input:
 278  *      powerUp - Flag to set the power down or up
 279  */
 280 void sii164SetPower(
 281         unsigned char powerUp
 282 )
 283 {
 284         unsigned char config;
 285
 286         config = i2cReadReg(SII164_I2C_ADDRESS, SII164_CONFIGURATION);
 287         if (powerUp == 1) {
 288                 /* Power up the chip */
 289                 config &= ~SII164_CONFIGURATION_POWER_MASK;
 290                 config |= SII164_CONFIGURATION_POWER_NORMAL;
 291                 i2cWriteReg(SII164_I2C_ADDRESS, SII164_CONFIGURATION, config);
 292         } else {
 293                 /* Power down the chip */
 294                 config &= ~SII164_CONFIGURATION_POWER_MASK;
 295                 config |= SII164_CONFIGURATION_POWER_DOWN;
 296                 i2cWriteReg(SII164_I2C_ADDRESS, SII164_CONFIGURATION, config);
 297         }
 298 }
 299
 300
 301 /*
 302  *  sii164SelectHotPlugDetectionMode
 303  *      This function selects the mode of the hot plug detection.
 304  */
 305 static void sii164SelectHotPlugDetectionMode(
 306         sii164_hot_plug_mode_t hotPlugMode
 307 )
 308 {
 309         unsigned char detectReg;
 310
 311         detectReg = i2cReadReg(SII164_I2C_ADDRESS, SII164_DETECT) & ~SII164_DETECT_MONITOR_SENSE_OUTPUT_FLAG;
 312         switch (hotPlugMode) {
 313         case SII164_HOTPLUG_DISABLE:
 314                 detectReg |= SII164_DETECT_MONITOR_SENSE_OUTPUT_HIGH;
 315                 break;
 316         case SII164_HOTPLUG_USE_MDI:
 317                 detectReg &= ~SII164_DETECT_INTERRUPT_MASK;
 318                 detectReg |= SII164_DETECT_INTERRUPT_BY_HTPLG_PIN;
 319                 detectReg |= SII164_DETECT_MONITOR_SENSE_OUTPUT_MDI;
 320                 break;
 321         case SII164_HOTPLUG_USE_RSEN:
 322                 detectReg |= SII164_DETECT_MONITOR_SENSE_OUTPUT_RSEN;
 323                 break;
 324         case SII164_HOTPLUG_USE_HTPLG:
 325                 detectReg |= SII164_DETECT_MONITOR_SENSE_OUTPUT_HTPLG;
 326                 break;
 327         }
 328
 329         i2cWriteReg(SII164_I2C_ADDRESS, SII164_DETECT, detectReg);
 330 }
 331
 332 /*
 333  *  sii164EnableHotPlugDetection
 334  *      This function enables the Hot Plug detection.
 335  *
 336  *  enableHotPlug   - Enable (=1) / disable (=0) Hot Plug detection
 337  */
 338 void sii164EnableHotPlugDetection(
 339         unsigned char enableHotPlug
 340 )
 341 {
 342         unsigned char detectReg;
 343
 344         detectReg = i2cReadReg(SII164_I2C_ADDRESS, SII164_DETECT);
 345
 346         /* Depending on each DVI controller, need to enable the hot plug based on each
 347            individual chip design. */
 348         if (enableHotPlug != 0)
 349                 sii164SelectHotPlugDetectionMode(SII164_HOTPLUG_USE_MDI);
 350         else
 351                 sii164SelectHotPlugDetectionMode(SII164_HOTPLUG_DISABLE);
 352 }
 353
 354 /*
 355  *  sii164IsConnected
 356  *      Check if the DVI Monitor is connected.
 357  *
 358  *  Output:
 359  *      0   - Not Connected
 360  *      1   - Connected
 361  */
 362 unsigned char sii164IsConnected(void)
 363 {
 364         unsigned char hotPlugValue;
 365
 366         hotPlugValue = i2cReadReg(SII164_I2C_ADDRESS, SII164_DETECT) & SII164_DETECT_HOT_PLUG_STATUS_MASK;
 367         if (hotPlugValue == SII164_DETECT_HOT_PLUG_STATUS_ON)
 368                 return 1;
 369         else
 370                 return 0;
 371 }
 372
 373 /*
 374  *  sii164CheckInterrupt
 375  *      Checks if interrupt has occurred.
 376  *
 377  *  Output:
 378  *      0   - No interrupt
 379  *      1   - Interrupt occurs
 380  */
 381 unsigned char sii164CheckInterrupt(void)
 382 {
 383         unsigned char detectReg;
 384
 385         detectReg = i2cReadReg(SII164_I2C_ADDRESS, SII164_DETECT) & SII164_DETECT_MONITOR_STATE_MASK;
 386         if (detectReg == SII164_DETECT_MONITOR_STATE_CHANGE)
 387                 return 1;
 388         else
 389                 return 0;
 390 }
 391
 392 /*
 393  *  sii164ClearInterrupt
 394  *      Clear the hot plug interrupt.
 395  */
 396 void sii164ClearInterrupt(void)
 397 {
 398         unsigned char detectReg;
 399
 400         /* Clear the MDI interrupt */
 401         detectReg = i2cReadReg(SII164_I2C_ADDRESS, SII164_DETECT);
 402         i2cWriteReg(SII164_I2C_ADDRESS, SII164_DETECT, detectReg | SII164_DETECT_MONITOR_STATE_CLEAR);
 403 }
 404
 405 #endif
 406
 407 #endif
 408
 409