1 /* 2 * Copyright 2012-15 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: AMD 23 * 24 */ 25 26 #include <linux/delay.h> 27 #include <linux/slab.h> 28 29 #include "dm_services.h" 30 31 #include "include/gpio_interface.h" 32 #include "include/gpio_types.h" 33 #include "hw_gpio.h" 34 #include "hw_ddc.h" 35 36 #include "reg_helper.h" 37 #include "gpio_regs.h" 38 39 40 #undef FN 41 #define FN(reg_name, field_name) \ 42 ddc->shifts->field_name, ddc->masks->field_name 43 44 #define CTX \ 45 ddc->base.base.ctx 46 #define REG(reg)\ 47 (ddc->regs->reg) 48 49 struct gpio; 50 51 static void destruct( 52 struct hw_ddc *pin) 53 { 54 dal_hw_gpio_destruct(&pin->base); 55 } 56 57 static void destroy( 58 struct hw_gpio_pin **ptr) 59 { 60 struct hw_ddc *pin = HW_DDC_FROM_BASE(*ptr); 61 62 destruct(pin); 63 64 kfree(pin); 65 66 *ptr = NULL; 67 } 68 69 static enum gpio_result set_config( 70 struct hw_gpio_pin *ptr, 71 const struct gpio_config_data *config_data) 72 { 73 struct hw_ddc *ddc = HW_DDC_FROM_BASE(ptr); 74 struct hw_gpio *hw_gpio = NULL; 75 uint32_t regval; 76 uint32_t ddc_data_pd_en = 0; 77 uint32_t ddc_clk_pd_en = 0; 78 uint32_t aux_pad_mode = 0; 79 80 hw_gpio = &ddc->base; 81 82 if (hw_gpio == NULL) { 83 ASSERT_CRITICAL(false); 84 return GPIO_RESULT_NULL_HANDLE; 85 } 86 87 regval = REG_GET_3(gpio.MASK_reg, 88 DC_GPIO_DDC1DATA_PD_EN, &ddc_data_pd_en, 89 DC_GPIO_DDC1CLK_PD_EN, &ddc_clk_pd_en, 90 AUX_PAD1_MODE, &aux_pad_mode); 91 92 switch (config_data->config.ddc.type) { 93 case GPIO_DDC_CONFIG_TYPE_MODE_I2C: 94 /* On plug-in, there is a transient level on the pad 95 * which must be discharged through the internal pull-down. 96 * Enable internal pull-down, 2.5msec discharge time 97 * is required for detection of AUX mode */ 98 if (hw_gpio->base.en != GPIO_DDC_LINE_VIP_PAD) { 99 if (!ddc_data_pd_en || !ddc_clk_pd_en) { 100 101 REG_SET_2(gpio.MASK_reg, regval, 102 DC_GPIO_DDC1DATA_PD_EN, 1, 103 DC_GPIO_DDC1CLK_PD_EN, 1); 104 105 if (config_data->type == 106 GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE) 107 msleep(3); 108 } 109 } else { 110 uint32_t reg2; 111 uint32_t sda_pd_dis = 0; 112 uint32_t scl_pd_dis = 0; 113 114 reg2 = REG_GET_2(gpio.MASK_reg, 115 DC_GPIO_SDA_PD_DIS, &sda_pd_dis, 116 DC_GPIO_SCL_PD_DIS, &scl_pd_dis); 117 118 if (sda_pd_dis) { 119 REG_SET(gpio.MASK_reg, regval, 120 DC_GPIO_SDA_PD_DIS, 0); 121 122 if (config_data->type == 123 GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE) 124 msleep(3); 125 } 126 127 if (!scl_pd_dis) { 128 REG_SET(gpio.MASK_reg, regval, 129 DC_GPIO_SCL_PD_DIS, 1); 130 131 if (config_data->type == 132 GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE) 133 msleep(3); 134 } 135 } 136 137 if (aux_pad_mode) { 138 /* let pins to get de-asserted 139 * before setting pad to I2C mode */ 140 if (config_data->config.ddc.data_en_bit_present || 141 config_data->config.ddc.clock_en_bit_present) 142 /* [anaumov] in DAL2, there was 143 * dc_service_delay_in_microseconds(2000); */ 144 msleep(2); 145 146 /* set the I2C pad mode */ 147 /* read the register again, 148 * some bits may have been changed */ 149 REG_UPDATE(gpio.MASK_reg, 150 AUX_PAD1_MODE, 0); 151 } 152 153 if (ddc->regs->dc_gpio_aux_ctrl_5 != 0) { 154 REG_UPDATE(dc_gpio_aux_ctrl_5, DDC_PAD_I2CMODE, 1); 155 } 156 //set DC_IO_aux_rxsel = 2'b01 157 if (ddc->regs->phy_aux_cntl != 0) { 158 REG_UPDATE(phy_aux_cntl, AUX_PAD_RXSEL, 1); 159 } 160 return GPIO_RESULT_OK; 161 case GPIO_DDC_CONFIG_TYPE_MODE_AUX: 162 /* set the AUX pad mode */ 163 if (!aux_pad_mode) { 164 REG_SET(gpio.MASK_reg, regval, 165 AUX_PAD1_MODE, 1); 166 } 167 if (ddc->regs->dc_gpio_aux_ctrl_5 != 0) { 168 REG_UPDATE(dc_gpio_aux_ctrl_5, 169 DDC_PAD_I2CMODE, 0); 170 } 171 172 return GPIO_RESULT_OK; 173 case GPIO_DDC_CONFIG_TYPE_POLL_FOR_CONNECT: 174 if ((hw_gpio->base.en >= GPIO_DDC_LINE_DDC1) && 175 (hw_gpio->base.en <= GPIO_DDC_LINE_DDC_VGA)) { 176 REG_UPDATE_3(ddc_setup, 177 DC_I2C_DDC1_ENABLE, 1, 178 DC_I2C_DDC1_EDID_DETECT_ENABLE, 1, 179 DC_I2C_DDC1_EDID_DETECT_MODE, 0); 180 return GPIO_RESULT_OK; 181 } 182 break; 183 case GPIO_DDC_CONFIG_TYPE_POLL_FOR_DISCONNECT: 184 if ((hw_gpio->base.en >= GPIO_DDC_LINE_DDC1) && 185 (hw_gpio->base.en <= GPIO_DDC_LINE_DDC_VGA)) { 186 REG_UPDATE_3(ddc_setup, 187 DC_I2C_DDC1_ENABLE, 1, 188 DC_I2C_DDC1_EDID_DETECT_ENABLE, 1, 189 DC_I2C_DDC1_EDID_DETECT_MODE, 1); 190 return GPIO_RESULT_OK; 191 } 192 break; 193 case GPIO_DDC_CONFIG_TYPE_DISABLE_POLLING: 194 if ((hw_gpio->base.en >= GPIO_DDC_LINE_DDC1) && 195 (hw_gpio->base.en <= GPIO_DDC_LINE_DDC_VGA)) { 196 REG_UPDATE_2(ddc_setup, 197 DC_I2C_DDC1_ENABLE, 0, 198 DC_I2C_DDC1_EDID_DETECT_ENABLE, 0); 199 return GPIO_RESULT_OK; 200 } 201 break; 202 } 203 204 BREAK_TO_DEBUGGER(); 205 206 return GPIO_RESULT_NON_SPECIFIC_ERROR; 207 } 208 209 static const struct hw_gpio_pin_funcs funcs = { 210 .destroy = destroy, 211 .open = dal_hw_gpio_open, 212 .get_value = dal_hw_gpio_get_value, 213 .set_value = dal_hw_gpio_set_value, 214 .set_config = set_config, 215 .change_mode = dal_hw_gpio_change_mode, 216 .close = dal_hw_gpio_close, 217 }; 218 219 static void construct( 220 struct hw_ddc *ddc, 221 enum gpio_id id, 222 uint32_t en, 223 struct dc_context *ctx) 224 { 225 dal_hw_gpio_construct(&ddc->base, id, en, ctx); 226 ddc->base.base.funcs = &funcs; 227 } 228 229 void dal_hw_ddc_init( 230 struct hw_ddc **hw_ddc, 231 struct dc_context *ctx, 232 enum gpio_id id, 233 uint32_t en) 234 { 235 if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) { 236 ASSERT_CRITICAL(false); 237 *hw_ddc = NULL; 238 } 239 240 *hw_ddc = kzalloc(sizeof(struct hw_ddc), GFP_KERNEL); 241 if (!*hw_ddc) { 242 ASSERT_CRITICAL(false); 243 return; 244 } 245 246 construct(*hw_ddc, id, en, ctx); 247 } 248 249 struct hw_gpio_pin *dal_hw_ddc_get_pin(struct gpio *gpio) 250 { 251 struct hw_ddc *hw_ddc = dal_gpio_get_ddc(gpio); 252 253 return &hw_ddc->base.base; 254 } 255