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 } 309 310