drivers/gpu/drm/radeon/radeon_i2c.c

   1 /*
   2  * Copyright 2007-8 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  19  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  20  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  21  * OTHER DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors: Dave Airlie
  24  *          Alex Deucher
  25  */
  26 #include "drmP.h"
  27 #include "radeon_drm.h"
  28 #include "radeon.h"
  29
  30 /**
  31  * radeon_ddc_probe
  32  *
  33  */
  34 bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
  35 {
  36         u8 out_buf[] = { 0x0, 0x0};
  37         u8 buf[2];
  38         int ret;
  39         struct i2c_msg msgs[] = {
  40                 {
  41                         .addr = 0x50,
  42                         .flags = 0,
  43                         .len = 1,
  44                         .buf = out_buf,
  45                 },
  46                 {
  47                         .addr = 0x50,
  48                         .flags = I2C_M_RD,
  49                         .len = 1,
  50                         .buf = buf,
  51                 }
  52         };
  53
  54         ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
  55         if (ret == 2)
  56                 return true;
  57
  58         return false;
  59 }
  60
  61
  62 static void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
  63 {
  64         struct radeon_device *rdev = i2c->dev->dev_private;
  65         struct radeon_i2c_bus_rec *rec = &i2c->rec;
  66         uint32_t temp;
  67
  68         /* RV410 appears to have a bug where the hw i2c in reset
  69          * holds the i2c port in a bad state - switch hw i2c away before
  70          * doing DDC - do this for all r200s/r300s/r400s for safety sake
  71          */
  72         if (rec->hw_capable) {
  73                 if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
  74                         if (rec->a_clk_reg == RADEON_GPIO_MONID) {
  75                                 WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
  76                                                                R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
  77                         } else {
  78                                 WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
  79                                                                R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
  80                         }
  81                 }
  82         }
  83
  84         /* clear the output pin values */
  85         temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
  86         WREG32(rec->a_clk_reg, temp);
  87
  88         temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
  89         WREG32(rec->a_data_reg, temp);
  90
  91         /* set the pins to input */
  92         temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
  93         WREG32(rec->en_clk_reg, temp);
  94
  95         temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
  96         WREG32(rec->en_data_reg, temp);
  97
  98         /* mask the gpio pins for software use */
  99         temp = RREG32(rec->mask_clk_reg);
 100         if (lock_state)
 101                 temp |= rec->mask_clk_mask;
 102         else
 103                 temp &= ~rec->mask_clk_mask;
 104         WREG32(rec->mask_clk_reg, temp);
 105         temp = RREG32(rec->mask_clk_reg);
 106
 107         temp = RREG32(rec->mask_data_reg);
 108         if (lock_state)
 109                 temp |= rec->mask_data_mask;
 110         else
 111                 temp &= ~rec->mask_data_mask;
 112         WREG32(rec->mask_data_reg, temp);
 113         temp = RREG32(rec->mask_data_reg);
 114 }
 115
 116 static int get_clock(void *i2c_priv)
 117 {
 118         struct radeon_i2c_chan *i2c = i2c_priv;
 119         struct radeon_device *rdev = i2c->dev->dev_private;
 120         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 121         uint32_t val;
 122
 123         /* read the value off the pin */
 124         val = RREG32(rec->y_clk_reg);
 125         val &= rec->y_clk_mask;
 126
 127         return (val != 0);
 128 }
 129
 130
 131 static int get_data(void *i2c_priv)
 132 {
 133         struct radeon_i2c_chan *i2c = i2c_priv;
 134         struct radeon_device *rdev = i2c->dev->dev_private;
 135         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 136         uint32_t val;
 137
 138         /* read the value off the pin */
 139         val = RREG32(rec->y_data_reg);
 140         val &= rec->y_data_mask;
 141
 142         return (val != 0);
 143 }
 144
 145 static void set_clock(void *i2c_priv, int clock)
 146 {
 147         struct radeon_i2c_chan *i2c = i2c_priv;
 148         struct radeon_device *rdev = i2c->dev->dev_private;
 149         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 150         uint32_t val;
 151
 152         /* set pin direction */
 153         val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
 154         val |= clock ? 0 : rec->en_clk_mask;
 155         WREG32(rec->en_clk_reg, val);
 156 }
 157
 158 static void set_data(void *i2c_priv, int data)
 159 {
 160         struct radeon_i2c_chan *i2c = i2c_priv;
 161         struct radeon_device *rdev = i2c->dev->dev_private;
 162         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 163         uint32_t val;
 164
 165         /* set pin direction */
 166         val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
 167         val |= data ? 0 : rec->en_data_mask;
 168         WREG32(rec->en_data_reg, val);
 169 }
 170
 171 static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
 172                            struct i2c_msg *msgs, int num)
 173 {
 174         struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
 175         int ret;
 176
 177         radeon_i2c_do_lock(i2c, 1);
 178         if (i2c_transfer(&i2c->algo.radeon.bit_adapter, msgs, num) == num)
 179                 ret = num;
 180         else
 181                 ret = -1;
 182         radeon_i2c_do_lock(i2c, 0);
 183
 184         return ret;
 185 }
 186
 187 static u32 radeon_i2c_func(struct i2c_adapter *adap)
 188 {
 189         return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
 190 }
 191
 192 static const struct i2c_algorithm radeon_i2c_algo = {
 193         .master_xfer = radeon_i2c_xfer,
 194         .functionality = radeon_i2c_func,
 195 };
 196
 197 struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
 198                                           struct radeon_i2c_bus_rec *rec,
 199                                           const char *name)
 200 {
 201         struct radeon_i2c_chan *i2c;
 202         int ret;
 203
 204         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 205         if (i2c == NULL)
 206                 return NULL;
 207
 208         i2c->dev = dev;
 209         i2c->rec = *rec;
 210         /* set the internal bit adapter */
 211         i2c->algo.radeon.bit_adapter.owner = THIS_MODULE;
 212         i2c_set_adapdata(&i2c->algo.radeon.bit_adapter, i2c);
 213         sprintf(i2c->algo.radeon.bit_adapter.name, "Radeon internal i2c bit bus %s", name);
 214         i2c->algo.radeon.bit_adapter.algo_data = &i2c->algo.radeon.bit_data;
 215         i2c->algo.radeon.bit_data.setsda = set_data;
 216         i2c->algo.radeon.bit_data.setscl = set_clock;
 217         i2c->algo.radeon.bit_data.getsda = get_data;
 218         i2c->algo.radeon.bit_data.getscl = get_clock;
 219         i2c->algo.radeon.bit_data.udelay = 20;
 220         /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
 221          * make this, 2 jiffies is a lot more reliable */
 222         i2c->algo.radeon.bit_data.timeout = 2;
 223         i2c->algo.radeon.bit_data.data = i2c;
 224         ret = i2c_bit_add_bus(&i2c->algo.radeon.bit_adapter);
 225         if (ret) {
 226                 DRM_INFO("Failed to register internal bit i2c %s\n", name);
 227                 goto out_free;
 228         }
 229         /* set the radeon i2c adapter */
 230         i2c->adapter.owner = THIS_MODULE;
 231         i2c_set_adapdata(&i2c->adapter, i2c);
 232         sprintf(i2c->adapter.name, "Radeon i2c %s", name);
 233         i2c->adapter.algo_data = &i2c->algo.radeon;
 234         i2c->adapter.algo = &radeon_i2c_algo;
 235         ret = i2c_add_adapter(&i2c->adapter);
 236         if (ret) {
 237                 DRM_INFO("Failed to register i2c %s\n", name);
 238                 goto out_free;
 239         }
 240
 241         return i2c;
 242 out_free:
 243         kfree(i2c);
 244         return NULL;
 245
 246 }
 247
 248 struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,
 249                                              struct radeon_i2c_bus_rec *rec,
 250                                              const char *name)
 251 {
 252         struct radeon_i2c_chan *i2c;
 253         int ret;
 254
 255         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 256         if (i2c == NULL)
 257                 return NULL;
 258
 259         i2c->rec = *rec;
 260         i2c->adapter.owner = THIS_MODULE;
 261         i2c->dev = dev;
 262         i2c_set_adapdata(&i2c->adapter, i2c);
 263         i2c->adapter.algo_data = &i2c->algo.dp;
 264         i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;
 265         i2c->algo.dp.address = 0;
 266         ret = i2c_dp_aux_add_bus(&i2c->adapter);
 267         if (ret) {
 268                 DRM_INFO("Failed to register i2c %s\n", name);
 269                 goto out_free;
 270         }
 271
 272         return i2c;
 273 out_free:
 274         kfree(i2c);
 275         return NULL;
 276
 277 }
 278
 279 void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
 280 {
 281         if (!i2c)
 282                 return;
 283         i2c_del_adapter(&i2c->algo.radeon.bit_adapter);
 284         i2c_del_adapter(&i2c->adapter);
 285         kfree(i2c);
 286 }
 287
 288 void radeon_i2c_destroy_dp(struct radeon_i2c_chan *i2c)
 289 {
 290         if (!i2c)
 291                 return;
 292
 293         i2c_del_adapter(&i2c->adapter);
 294         kfree(i2c);
 295 }
 296
 297 struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
 298 {
 299         return NULL;
 300 }
 301
 302 void radeon_i2c_get_byte(struct radeon_i2c_chan *i2c_bus,
 303                          u8 slave_addr,
 304                          u8 addr,
 305                          u8 *val)
 306 {
 307         u8 out_buf[2];
 308         u8 in_buf[2];
 309         struct i2c_msg msgs[] = {
 310                 {
 311                         .addr = slave_addr,
 312                         .flags = 0,
 313                         .len = 1,
 314                         .buf = out_buf,
 315                 },
 316                 {
 317                         .addr = slave_addr,
 318                         .flags = I2C_M_RD,
 319                         .len = 1,
 320                         .buf = in_buf,
 321                 }
 322         };
 323
 324         out_buf[0] = addr;
 325         out_buf[1] = 0;
 326
 327         if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
 328                 *val = in_buf[0];
 329                 DRM_DEBUG("val = 0x%02x\n", *val);
 330         } else {
 331                 DRM_ERROR("i2c 0x%02x 0x%02x read failed\n",
 332                           addr, *val);
 333         }
 334 }
 335
 336 void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus,
 337                          u8 slave_addr,
 338                          u8 addr,
 339                          u8 val)
 340 {
 341         uint8_t out_buf[2];
 342         struct i2c_msg msg = {
 343                 .addr = slave_addr,
 344                 .flags = 0,
 345                 .len = 2,
 346                 .buf = out_buf,
 347         };
 348
 349         out_buf[0] = addr;
 350         out_buf[1] = val;
 351
 352         if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
 353                 DRM_ERROR("i2c 0x%02x 0x%02x write failed\n",
 354                           addr, val);
 355 }
 356