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 } 210