drivers/gpu/drm/i915/dvo_sil164.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 SIL164_VID 0x0001
  32 #define SIL164_DID 0x0006
  33
  34 #define SIL164_VID_LO 0x00
  35 #define SIL164_VID_HI 0x01
  36 #define SIL164_DID_LO 0x02
  37 #define SIL164_DID_HI 0x03
  38 #define SIL164_REV    0x04
  39 #define SIL164_RSVD   0x05
  40 #define SIL164_FREQ_LO 0x06
  41 #define SIL164_FREQ_HI 0x07
  42
  43 #define SIL164_REG8 0x08
  44 #define SIL164_8_VEN (1<<5)
  45 #define SIL164_8_HEN (1<<4)
  46 #define SIL164_8_DSEL (1<<3)
  47 #define SIL164_8_BSEL (1<<2)
  48 #define SIL164_8_EDGE (1<<1)
  49 #define SIL164_8_PD   (1<<0)
  50
  51 #define SIL164_REG9 0x09
  52 #define SIL164_9_VLOW (1<<7)
  53 #define SIL164_9_MSEL_MASK (0x7<<4)
  54 #define SIL164_9_TSEL (1<<3)
  55 #define SIL164_9_RSEN (1<<2)
  56 #define SIL164_9_HTPLG (1<<1)
  57 #define SIL164_9_MDI (1<<0)
  58
  59 #define SIL164_REGC 0x0c
  60
  61 struct sil164_save_rec {
  62         uint8_t reg8;
  63         uint8_t reg9;
  64         uint8_t regc;
  65 };
  66
  67 struct sil164_priv {
  68         //I2CDevRec d;
  69         bool quiet;
  70         struct sil164_save_rec save_regs;
  71         struct sil164_save_rec mode_regs;
  72 };
  73
  74 #define SILPTR(d) ((SIL164Ptr)(d->DriverPrivate.ptr))
  75
  76 static bool sil164_readb(struct intel_dvo_device *dvo, int addr, uint8_t *ch)
  77 {
  78         struct sil164_priv *sil = dvo->dev_priv;
  79         struct i2c_adapter *adapter = dvo->i2c_bus;
  80         struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
  81         u8 out_buf[2];
  82         u8 in_buf[2];
  83
  84         struct i2c_msg msgs[] = {
  85                 {
  86                         .addr = dvo->slave_addr,
  87                         .flags = 0,
  88                         .len = 1,
  89                         .buf = out_buf,
  90                 },
  91                 {
  92                         .addr = dvo->slave_addr,
  93                         .flags = I2C_M_RD,
  94                         .len = 1,
  95                         .buf = in_buf,
  96                 }
  97         };
  98
  99         out_buf[0] = addr;
 100         out_buf[1] = 0;
 101
 102         if (i2c_transfer(&i2cbus->adapter, msgs, 2) == 2) {
 103                 *ch = in_buf[0];
 104                 return true;
 105         };
 106
 107         if (!sil->quiet) {
 108                 DRM_DEBUG("Unable to read register 0x%02x from %s:%02x.\n",
 109                           addr, i2cbus->adapter.name, dvo->slave_addr);
 110         }
 111         return false;
 112 }
 113
 114 static bool sil164_writeb(struct intel_dvo_device *dvo, int addr, uint8_t ch)
 115 {
 116         struct sil164_priv *sil= dvo->dev_priv;
 117         struct i2c_adapter *adapter = dvo->i2c_bus;
 118         struct intel_i2c_chan *i2cbus = container_of(adapter, struct intel_i2c_chan, adapter);
 119         uint8_t out_buf[2];
 120         struct i2c_msg msg = {
 121                 .addr = dvo->slave_addr,
 122                 .flags = 0,
 123                 .len = 2,
 124                 .buf = out_buf,
 125         };
 126
 127         out_buf[0] = addr;
 128         out_buf[1] = ch;
 129
 130         if (i2c_transfer(&i2cbus->adapter, &msg, 1) == 1)
 131                 return true;
 132
 133         if (!sil->quiet) {
 134                 DRM_DEBUG("Unable to write register 0x%02x to %s:%d.\n",
 135                           addr, i2cbus->adapter.name, dvo->slave_addr);
 136         }
 137
 138         return false;
 139 }
 140
 141 /* Silicon Image 164 driver for chip on i2c bus */
 142 static bool sil164_init(struct intel_dvo_device *dvo,
 143                         struct i2c_adapter *adapter)
 144 {
 145         /* this will detect the SIL164 chip on the specified i2c bus */
 146         struct sil164_priv *sil;
 147         unsigned char ch;
 148
 149         sil = kzalloc(sizeof(struct sil164_priv), GFP_KERNEL);
 150         if (sil == NULL)
 151                 return false;
 152
 153         dvo->i2c_bus = adapter;
 154         dvo->dev_priv = sil;
 155         sil->quiet = true;
 156
 157         if (!sil164_readb(dvo, SIL164_VID_LO, &ch))
 158                 goto out;
 159
 160         if (ch != (SIL164_VID & 0xff)) {
 161                 DRM_DEBUG("sil164 not detected got %d: from %s Slave %d.\n",
 162                           ch, adapter->name, dvo->slave_addr);
 163                 goto out;
 164         }
 165
 166         if (!sil164_readb(dvo, SIL164_DID_LO, &ch))
 167                 goto out;
 168
 169         if (ch != (SIL164_DID & 0xff)) {
 170                 DRM_DEBUG("sil164 not detected got %d: from %s Slave %d.\n",
 171                           ch, adapter->name, dvo->slave_addr);
 172                 goto out;
 173         }
 174         sil->quiet = false;
 175
 176         DRM_DEBUG("init sil164 dvo controller successfully!\n");
 177         return true;
 178
 179 out:
 180         kfree(sil);
 181         return false;
 182 }
 183
 184 static enum drm_connector_status sil164_detect(struct intel_dvo_device *dvo)
 185 {
 186         uint8_t reg9;
 187
 188         sil164_readb(dvo, SIL164_REG9, &reg9);
 189
 190         if (reg9 & SIL164_9_HTPLG)
 191                 return connector_status_connected;
 192         else
 193                 return connector_status_disconnected;
 194 }
 195
 196 static enum drm_mode_status sil164_mode_valid(struct intel_dvo_device *dvo,
 197                                               struct drm_display_mode *mode)
 198 {
 199         return MODE_OK;
 200 }
 201
 202 static void sil164_mode_set(struct intel_dvo_device *dvo,
 203                             struct drm_display_mode *mode,
 204                             struct drm_display_mode *adjusted_mode)
 205 {
 206         /* As long as the basics are set up, since we don't have clock
 207          * dependencies in the mode setup, we can just leave the
 208          * registers alone and everything will work fine.
 209          */
 210         /* recommended programming sequence from doc */
 211         /*sil164_writeb(sil, 0x08, 0x30);
 212           sil164_writeb(sil, 0x09, 0x00);
 213           sil164_writeb(sil, 0x0a, 0x90);
 214           sil164_writeb(sil, 0x0c, 0x89);
 215           sil164_writeb(sil, 0x08, 0x31);*/
 216         /* don't do much */
 217         return;
 218 }
 219
 220 /* set the SIL164 power state */
 221 static void sil164_dpms(struct intel_dvo_device *dvo, int mode)
 222 {
 223         int ret;
 224         unsigned char ch;
 225
 226         ret = sil164_readb(dvo, SIL164_REG8, &ch);
 227         if (ret == false)
 228                 return;
 229
 230         if (mode == DRM_MODE_DPMS_ON)
 231                 ch |= SIL164_8_PD;
 232         else
 233                 ch &= ~SIL164_8_PD;
 234
 235         sil164_writeb(dvo, SIL164_REG8, ch);
 236         return;
 237 }
 238
 239 static void sil164_dump_regs(struct intel_dvo_device *dvo)
 240 {
 241         uint8_t val;
 242
 243         sil164_readb(dvo, SIL164_FREQ_LO, &val);
 244         DRM_DEBUG("SIL164_FREQ_LO: 0x%02x\n", val);
 245         sil164_readb(dvo, SIL164_FREQ_HI, &val);
 246         DRM_DEBUG("SIL164_FREQ_HI: 0x%02x\n", val);
 247         sil164_readb(dvo, SIL164_REG8, &val);
 248         DRM_DEBUG("SIL164_REG8: 0x%02x\n", val);
 249         sil164_readb(dvo, SIL164_REG9, &val);
 250         DRM_DEBUG("SIL164_REG9: 0x%02x\n", val);
 251         sil164_readb(dvo, SIL164_REGC, &val);
 252         DRM_DEBUG("SIL164_REGC: 0x%02x\n", val);
 253 }
 254
 255 static void sil164_save(struct intel_dvo_device *dvo)
 256 {
 257         struct sil164_priv *sil= dvo->dev_priv;
 258
 259         if (!sil164_readb(dvo, SIL164_REG8, &sil->save_regs.reg8))
 260                 return;
 261
 262         if (!sil164_readb(dvo, SIL164_REG9, &sil->save_regs.reg9))
 263                 return;
 264
 265         if (!sil164_readb(dvo, SIL164_REGC, &sil->save_regs.regc))
 266                 return;
 267
 268         return;
 269 }
 270
 271 static void sil164_restore(struct intel_dvo_device *dvo)
 272 {
 273         struct sil164_priv *sil = dvo->dev_priv;
 274
 275         /* Restore it powered down initially */
 276         sil164_writeb(dvo, SIL164_REG8, sil->save_regs.reg8 & ~0x1);
 277
 278         sil164_writeb(dvo, SIL164_REG9, sil->save_regs.reg9);
 279         sil164_writeb(dvo, SIL164_REGC, sil->save_regs.regc);
 280         sil164_writeb(dvo, SIL164_REG8, sil->save_regs.reg8);
 281 }
 282
 283 static void sil164_destroy(struct intel_dvo_device *dvo)
 284 {
 285         struct sil164_priv *sil = dvo->dev_priv;
 286
 287         if (sil) {
 288                 kfree(sil);
 289                 dvo->dev_priv = NULL;
 290         }
 291 }
 292
 293 struct intel_dvo_dev_ops sil164_ops = {
 294         .init = sil164_init,
 295         .detect = sil164_detect,
 296         .mode_valid = sil164_mode_valid,
 297         .mode_set = sil164_mode_set,
 298         .dpms = sil164_dpms,
 299         .dump_regs = sil164_dump_regs,
 300         .save = sil164_save,
 301         .restore = sil164_restore,
 302         .destroy = sil164_destroy,
 303 };