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 ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {
  73                 if (rec->a_clk_reg == RADEON_GPIO_MONID) {
  74                         WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
  75                                                 R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));
  76                 } else {
  77                         WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |
  78                                                 R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));
  79                 }
  80         }
  81
  82         /* clear the output pin values */
  83         temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
  84         WREG32(rec->a_clk_reg, temp);
  85
  86         temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;
  87         WREG32(rec->a_data_reg, temp);
  88
  89
  90         /* mask the gpio pins for software use */
  91         temp = RREG32(rec->mask_clk_reg);
  92         if (lock_state)
  93                 temp |= rec->mask_clk_mask;
  94         else
  95                 temp &= ~rec->mask_clk_mask;
  96         WREG32(rec->mask_clk_reg, temp);
  97         temp = RREG32(rec->mask_clk_reg);
  98
  99         temp = RREG32(rec->mask_data_reg);
 100         if (lock_state)
 101                 temp |= rec->mask_data_mask;
 102         else
 103                 temp &= ~rec->mask_data_mask;
 104         WREG32(rec->mask_data_reg, temp);
 105         temp = RREG32(rec->mask_data_reg);
 106 }
 107
 108 static int get_clock(void *i2c_priv)
 109 {
 110         struct radeon_i2c_chan *i2c = i2c_priv;
 111         struct radeon_device *rdev = i2c->dev->dev_private;
 112         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 113         uint32_t val;
 114
 115         /* read the value off the pin */
 116         val = RREG32(rec->y_clk_reg);
 117         val &= rec->y_clk_mask;
 118
 119         return (val != 0);
 120 }
 121
 122
 123 static int get_data(void *i2c_priv)
 124 {
 125         struct radeon_i2c_chan *i2c = i2c_priv;
 126         struct radeon_device *rdev = i2c->dev->dev_private;
 127         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 128         uint32_t val;
 129
 130         /* read the value off the pin */
 131         val = RREG32(rec->y_data_reg);
 132         val &= rec->y_data_mask;
 133
 134         return (val != 0);
 135 }
 136
 137 static void set_clock(void *i2c_priv, int clock)
 138 {
 139         struct radeon_i2c_chan *i2c = i2c_priv;
 140         struct radeon_device *rdev = i2c->dev->dev_private;
 141         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 142         uint32_t val;
 143
 144         /* set pin direction */
 145         val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;
 146         val |= clock ? 0 : rec->en_clk_mask;
 147         WREG32(rec->en_clk_reg, val);
 148 }
 149
 150 static void set_data(void *i2c_priv, int data)
 151 {
 152         struct radeon_i2c_chan *i2c = i2c_priv;
 153         struct radeon_device *rdev = i2c->dev->dev_private;
 154         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 155         uint32_t val;
 156
 157         /* set pin direction */
 158         val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;
 159         val |= data ? 0 : rec->en_data_mask;
 160         WREG32(rec->en_data_reg, val);
 161 }
 162
 163 struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
 164                                           struct radeon_i2c_bus_rec *rec,
 165                                           const char *name)
 166 {
 167         struct radeon_i2c_chan *i2c;
 168         int ret;
 169
 170         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 171         if (i2c == NULL)
 172                 return NULL;
 173
 174         i2c->adapter.owner = THIS_MODULE;
 175         i2c->dev = dev;
 176         i2c_set_adapdata(&i2c->adapter, i2c);
 177         i2c->adapter.algo_data = &i2c->algo.bit;
 178         i2c->algo.bit.setsda = set_data;
 179         i2c->algo.bit.setscl = set_clock;
 180         i2c->algo.bit.getsda = get_data;
 181         i2c->algo.bit.getscl = get_clock;
 182         i2c->algo.bit.udelay = 20;
 183         /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
 184          * make this, 2 jiffies is a lot more reliable */
 185         i2c->algo.bit.timeout = 2;
 186         i2c->algo.bit.data = i2c;
 187         i2c->rec = *rec;
 188         ret = i2c_bit_add_bus(&i2c->adapter);
 189         if (ret) {
 190                 DRM_INFO("Failed to register i2c %s\n", name);
 191                 goto out_free;
 192         }
 193
 194         return i2c;
 195 out_free:
 196         kfree(i2c);
 197         return NULL;
 198
 199 }
 200
 201 struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,
 202                                              const char *name, bool dp, u8 i2c_id)
 203 {
 204         struct radeon_i2c_chan *i2c;
 205         int ret;
 206
 207         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 208         if (i2c == NULL)
 209                 return NULL;
 210
 211         i2c->i2c_id = i2c_id;
 212         i2c->adapter.owner = THIS_MODULE;
 213         i2c->dev = dev;
 214         i2c_set_adapdata(&i2c->adapter, i2c);
 215         i2c->adapter.algo_data = &i2c->algo.dp;
 216         i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;
 217         i2c->algo.dp.address = 0;
 218         ret = i2c_dp_aux_add_bus(&i2c->adapter);
 219         if (ret) {
 220                 DRM_INFO("Failed to register i2c %s\n", name);
 221                 goto out_free;
 222         }
 223
 224         return i2c;
 225 out_free:
 226         kfree(i2c);
 227         return NULL;
 228
 229 }
 230
 231
 232 void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
 233 {
 234         if (!i2c)
 235                 return;
 236
 237         i2c_del_adapter(&i2c->adapter);
 238         kfree(i2c);
 239 }
 240
 241 struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
 242 {
 243         return NULL;
 244 }
 245
 246 void radeon_i2c_sw_get_byte(struct radeon_i2c_chan *i2c_bus,
 247                             u8 slave_addr,
 248                             u8 addr,
 249                             u8 *val)
 250 {
 251         u8 out_buf[2];
 252         u8 in_buf[2];
 253         struct i2c_msg msgs[] = {
 254                 {
 255                         .addr = slave_addr,
 256                         .flags = 0,
 257                         .len = 1,
 258                         .buf = out_buf,
 259                 },
 260                 {
 261                         .addr = slave_addr,
 262                         .flags = I2C_M_RD,
 263                         .len = 1,
 264                         .buf = in_buf,
 265                 }
 266         };
 267
 268         out_buf[0] = addr;
 269         out_buf[1] = 0;
 270
 271         if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {
 272                 *val = in_buf[0];
 273                 DRM_DEBUG("val = 0x%02x\n", *val);
 274         } else {
 275                 DRM_ERROR("i2c 0x%02x 0x%02x read failed\n",
 276                           addr, *val);
 277         }
 278 }
 279
 280 void radeon_i2c_sw_put_byte(struct radeon_i2c_chan *i2c_bus,
 281                             u8 slave_addr,
 282                             u8 addr,
 283                             u8 val)
 284 {
 285         uint8_t out_buf[2];
 286         struct i2c_msg msg = {
 287                 .addr = slave_addr,
 288                 .flags = 0,
 289                 .len = 2,
 290                 .buf = out_buf,
 291         };
 292
 293         out_buf[0] = addr;
 294         out_buf[1] = val;
 295
 296         if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
 297                 DRM_ERROR("i2c 0x%02x 0x%02x write failed\n",
 298                           addr, val);
 299 }
 300