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 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 struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
 172                                           struct radeon_i2c_bus_rec *rec,
 173                                           const char *name)
 174 {
 175         struct radeon_i2c_chan *i2c;
 176         int ret;
 177
 178         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 179         if (i2c == NULL)
 180                 return NULL;
 181
 182         i2c->adapter.owner = THIS_MODULE;
 183         i2c->dev = dev;
 184         i2c_set_adapdata(&i2c->adapter, i2c);
 185         i2c->adapter.algo_data = &i2c->algo.bit;
 186         i2c->algo.bit.setsda = set_data;
 187         i2c->algo.bit.setscl = set_clock;
 188         i2c->algo.bit.getsda = get_data;
 189         i2c->algo.bit.getscl = get_clock;
 190         i2c->algo.bit.udelay = 20;
 191         /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
 192          * make this, 2 jiffies is a lot more reliable */
 193         i2c->algo.bit.timeout = 2;
 194         i2c->algo.bit.data = i2c;
 195         i2c->rec = *rec;
 196         ret = i2c_bit_add_bus(&i2c->adapter);
 197         if (ret) {
 198                 DRM_INFO("Failed to register i2c %s\n", name);
 199                 goto out_free;
 200         }
 201
 202         return i2c;
 203 out_free:
 204         kfree(i2c);
 205         return NULL;
 206
 207 }
 208
 209 struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,
 210                                              struct radeon_i2c_bus_rec *rec,
 211                                              const char *name)
 212 {
 213         struct radeon_i2c_chan *i2c;
 214         int ret;
 215
 216         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 217         if (i2c == NULL)
 218                 return NULL;
 219
 220         i2c->rec = *rec;
 221         i2c->adapter.owner = THIS_MODULE;
 222         i2c->dev = dev;
 223         i2c_set_adapdata(&i2c->adapter, i2c);
 224         i2c->adapter.algo_data = &i2c->algo.dp;
 225         i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;
 226         i2c->algo.dp.address = 0;
 227         ret = i2c_dp_aux_add_bus(&i2c->adapter);
 228         if (ret) {
 229                 DRM_INFO("Failed to register i2c %s\n", name);
 230                 goto out_free;
 231         }
 232
 233         return i2c;
 234 out_free:
 235         kfree(i2c);
 236         return NULL;
 237
 238 }
 239
 240
 241 void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
 242 {
 243         if (!i2c)
 244                 return;
 245
 246         i2c_del_adapter(&i2c->adapter);
 247         kfree(i2c);
 248 }
 249
 250 struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
 251 {
 252         return NULL;
 253 }
 254
 255 void radeon_i2c_sw_get_byte(struct radeon_i2c_chan *i2c_bus,
 256                             u8 slave_addr,
 257                             u8 addr,
 258                             u8 *val)
 259 {
 260         u8 out_buf[2];
 261         u8 in_buf[2];
 262         struct i2c_msg msgs[] = {
 263                 {
 264                         .addr = slave_addr,
 265                         .flags = 0,
 266                         .len = 1,
 267                         .buf = out_buf,
 268                 },
 269                 {
 270                         .addr = slave_addr,
 271                         .flags = I2C_M_RD,
 272                         .len = 1,
 273                         .buf = in_buf,
 274                 }
 275         };
 276
 277         out_buf[0] = addr;
 278         out_buf[1] = 0;
 279
 280         if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
 281                 *val = in_buf[0];
 282                 DRM_DEBUG("val = 0x%02x\n", *val);
 283         } else {
 284                 DRM_ERROR("i2c 0x%02x 0x%02x read failed\n",
 285                           addr, *val);
 286         }
 287 }
 288
 289 void radeon_i2c_sw_put_byte(struct radeon_i2c_chan *i2c_bus,
 290                             u8 slave_addr,
 291                             u8 addr,
 292                             u8 val)
 293 {
 294         uint8_t out_buf[2];
 295         struct i2c_msg msg = {
 296                 .addr = slave_addr,
 297                 .flags = 0,
 298                 .len = 2,
 299                 .buf = out_buf,
 300         };
 301
 302         out_buf[0] = addr;
 303         out_buf[1] = val;
 304
 305         if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
 306                 DRM_ERROR("i2c 0x%02x 0x%02x write failed\n",
 307                           addr, val);
 308 }
 309