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_connector *radeon_connector, int lock_state)
  63 {
  64         struct radeon_device *rdev = radeon_connector->base.dev->dev_private;
  65         uint32_t temp;
  66         struct radeon_i2c_bus_rec *rec = &radeon_connector->ddc_bus->rec;
  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         if (lock_state) {
  82                 temp = RREG32(rec->a_clk_reg);
  83                 temp &= ~(rec->a_clk_mask);
  84                 WREG32(rec->a_clk_reg, temp);
  85
  86                 temp = RREG32(rec->a_data_reg);
  87                 temp &= ~(rec->a_data_mask);
  88                 WREG32(rec->a_data_reg, temp);
  89         }
  90
  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         val = RREG32(rec->get_clk_reg);
 116         val &= rec->get_clk_mask;
 117
 118         return (val != 0);
 119 }
 120
 121
 122 static int get_data(void *i2c_priv)
 123 {
 124         struct radeon_i2c_chan *i2c = i2c_priv;
 125         struct radeon_device *rdev = i2c->dev->dev_private;
 126         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 127         uint32_t val;
 128
 129         val = RREG32(rec->get_data_reg);
 130         val &= rec->get_data_mask;
 131         return (val != 0);
 132 }
 133
 134 static void set_clock(void *i2c_priv, int clock)
 135 {
 136         struct radeon_i2c_chan *i2c = i2c_priv;
 137         struct radeon_device *rdev = i2c->dev->dev_private;
 138         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 139         uint32_t val;
 140
 141         val = RREG32(rec->put_clk_reg) & (uint32_t)~(rec->put_clk_mask);
 142         val |= clock ? 0 : rec->put_clk_mask;
 143         WREG32(rec->put_clk_reg, val);
 144 }
 145
 146 static void set_data(void *i2c_priv, int data)
 147 {
 148         struct radeon_i2c_chan *i2c = i2c_priv;
 149         struct radeon_device *rdev = i2c->dev->dev_private;
 150         struct radeon_i2c_bus_rec *rec = &i2c->rec;
 151         uint32_t val;
 152
 153         val = RREG32(rec->put_data_reg) & (uint32_t)~(rec->put_data_mask);
 154         val |= data ? 0 : rec->put_data_mask;
 155         WREG32(rec->put_data_reg, val);
 156 }
 157
 158 struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
 159                 struct radeon_i2c_bus_rec *rec,
 160                 const char *name)
 161 {
 162         struct radeon_i2c_chan *i2c;
 163         int ret;
 164
 165         i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
 166         if (i2c == NULL)
 167                 return NULL;
 168
 169         i2c->adapter.owner = THIS_MODULE;
 170         i2c->adapter.algo_data = &i2c->algo;
 171         i2c->dev = dev;
 172         i2c->algo.setsda = set_data;
 173         i2c->algo.setscl = set_clock;
 174         i2c->algo.getsda = get_data;
 175         i2c->algo.getscl = get_clock;
 176         i2c->algo.udelay = 20;
 177         /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
 178          * make this, 2 jiffies is a lot more reliable */
 179         i2c->algo.timeout = 2;
 180         i2c->algo.data = i2c;
 181         i2c->rec = *rec;
 182         i2c_set_adapdata(&i2c->adapter, i2c);
 183
 184         ret = i2c_bit_add_bus(&i2c->adapter);
 185         if (ret) {
 186                 DRM_INFO("Failed to register i2c %s\n", name);
 187                 goto out_free;
 188         }
 189
 190         return i2c;
 191 out_free:
 192         kfree(i2c);
 193         return NULL;
 194
 195 }
 196
 197 void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
 198 {
 199         if (!i2c)
 200                 return;
 201
 202         i2c_del_adapter(&i2c->adapter);
 203         kfree(i2c);
 204 }
 205
 206 struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
 207 {
 208         return NULL;
 209 }