diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/gpio/hw_ddc.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/gpio/hw_ddc.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/gpio/hw_ddc.c b/drivers/gpu/drm/amd/display/dc/gpio/hw_ddc.c new file mode 100644 index 000000000000..310f48965b27 --- /dev/null +++ b/drivers/gpu/drm/amd/display/dc/gpio/hw_ddc.c @@ -0,0 +1,232 @@ +/* + * Copyright 2012-15 Advanced Micro Devices, Inc. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: AMD + * + */ + +#include "dm_services.h" + +#include "include/gpio_types.h" +#include "hw_gpio.h" +#include "hw_ddc.h" + +#include "reg_helper.h" +#include "gpio_regs.h" + + +#undef FN +#define FN(reg_name, field_name) \ + ddc->shifts->field_name, ddc->masks->field_name + +#define CTX \ + ddc->base.base.ctx +#define REG(reg)\ + (ddc->regs->reg) + +static void destruct( + struct hw_ddc *pin) +{ + dal_hw_gpio_destruct(&pin->base); +} + +static void destroy( + struct hw_gpio_pin **ptr) +{ + struct hw_ddc *pin = HW_DDC_FROM_BASE(*ptr); + + destruct(pin); + + kfree(pin); + + *ptr = NULL; +} + +static enum gpio_result set_config( + struct hw_gpio_pin *ptr, + const struct gpio_config_data *config_data) +{ + struct hw_ddc *ddc = HW_DDC_FROM_BASE(ptr); + struct hw_gpio *hw_gpio = NULL; + uint32_t regval; + uint32_t ddc_data_pd_en = 0; + uint32_t ddc_clk_pd_en = 0; + uint32_t aux_pad_mode = 0; + + hw_gpio = &ddc->base; + + if (hw_gpio == NULL) { + ASSERT_CRITICAL(false); + return GPIO_RESULT_NULL_HANDLE; + } + + regval = REG_GET_3(gpio.MASK_reg, + DC_GPIO_DDC1DATA_PD_EN, &ddc_data_pd_en, + DC_GPIO_DDC1CLK_PD_EN, &ddc_clk_pd_en, + AUX_PAD1_MODE, &aux_pad_mode); + + switch (config_data->config.ddc.type) { + case GPIO_DDC_CONFIG_TYPE_MODE_I2C: + /* On plug-in, there is a transient level on the pad + * which must be discharged through the internal pull-down. + * Enable internal pull-down, 2.5msec discharge time + * is required for detection of AUX mode */ + if (hw_gpio->base.en != GPIO_DDC_LINE_VIP_PAD) { + if (!ddc_data_pd_en || !ddc_clk_pd_en) { + + REG_SET_2(gpio.MASK_reg, regval, + DC_GPIO_DDC1DATA_PD_EN, 1, + DC_GPIO_DDC1CLK_PD_EN, 1); + + if (config_data->type == + GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE) + msleep(3); + } + } else { + uint32_t reg2; + uint32_t sda_pd_dis = 0; + uint32_t scl_pd_dis = 0; + + reg2 = REG_GET_2(gpio.MASK_reg, + DC_GPIO_SDA_PD_DIS, &sda_pd_dis, + DC_GPIO_SCL_PD_DIS, &scl_pd_dis); + + if (sda_pd_dis) { + REG_SET(gpio.MASK_reg, regval, + DC_GPIO_SDA_PD_DIS, 0); + + if (config_data->type == + GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE) + msleep(3); + } + + if (!scl_pd_dis) { + REG_SET(gpio.MASK_reg, regval, + DC_GPIO_SCL_PD_DIS, 1); + + if (config_data->type == + GPIO_CONFIG_TYPE_I2C_AUX_DUAL_MODE) + msleep(3); + } + } + + if (aux_pad_mode) { + /* let pins to get de-asserted + * before setting pad to I2C mode */ + if (config_data->config.ddc.data_en_bit_present || + config_data->config.ddc.clock_en_bit_present) + /* [anaumov] in DAL2, there was + * dc_service_delay_in_microseconds(2000); */ + msleep(2); + + /* set the I2C pad mode */ + /* read the register again, + * some bits may have been changed */ + REG_UPDATE(gpio.MASK_reg, + AUX_PAD1_MODE, 0); + } + + return GPIO_RESULT_OK; + case GPIO_DDC_CONFIG_TYPE_MODE_AUX: + /* set the AUX pad mode */ + if (!aux_pad_mode) { + REG_SET(gpio.MASK_reg, regval, + AUX_PAD1_MODE, 1); + } + + return GPIO_RESULT_OK; + case GPIO_DDC_CONFIG_TYPE_POLL_FOR_CONNECT: + if ((hw_gpio->base.en >= GPIO_DDC_LINE_DDC1) && + (hw_gpio->base.en <= GPIO_DDC_LINE_DDC_VGA)) { + REG_UPDATE_3(ddc_setup, + DC_I2C_DDC1_ENABLE, 1, + DC_I2C_DDC1_EDID_DETECT_ENABLE, 1, + DC_I2C_DDC1_EDID_DETECT_MODE, 0); + return GPIO_RESULT_OK; + } + break; + case GPIO_DDC_CONFIG_TYPE_POLL_FOR_DISCONNECT: + if ((hw_gpio->base.en >= GPIO_DDC_LINE_DDC1) && + (hw_gpio->base.en <= GPIO_DDC_LINE_DDC_VGA)) { + REG_UPDATE_3(ddc_setup, + DC_I2C_DDC1_ENABLE, 1, + DC_I2C_DDC1_EDID_DETECT_ENABLE, 1, + DC_I2C_DDC1_EDID_DETECT_MODE, 1); + return GPIO_RESULT_OK; + } + break; + case GPIO_DDC_CONFIG_TYPE_DISABLE_POLLING: + if ((hw_gpio->base.en >= GPIO_DDC_LINE_DDC1) && + (hw_gpio->base.en <= GPIO_DDC_LINE_DDC_VGA)) { + REG_UPDATE_2(ddc_setup, + DC_I2C_DDC1_ENABLE, 0, + DC_I2C_DDC1_EDID_DETECT_ENABLE, 0); + return GPIO_RESULT_OK; + } + break; + } + + BREAK_TO_DEBUGGER(); + + return GPIO_RESULT_NON_SPECIFIC_ERROR; +} + +static const struct hw_gpio_pin_funcs funcs = { + .destroy = destroy, + .open = dal_hw_gpio_open, + .get_value = dal_hw_gpio_get_value, + .set_value = dal_hw_gpio_set_value, + .set_config = set_config, + .change_mode = dal_hw_gpio_change_mode, + .close = dal_hw_gpio_close, +}; + +static void construct( + struct hw_ddc *ddc, + enum gpio_id id, + uint32_t en, + struct dc_context *ctx) +{ + dal_hw_gpio_construct(&ddc->base, id, en, ctx); + ddc->base.base.funcs = &funcs; +} + +struct hw_gpio_pin *dal_hw_ddc_create( + struct dc_context *ctx, + enum gpio_id id, + uint32_t en) +{ + struct hw_ddc *pin; + + if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) { + ASSERT_CRITICAL(false); + return NULL; + } + + pin = kzalloc(sizeof(struct hw_ddc), GFP_KERNEL); + if (!pin) { + ASSERT_CRITICAL(false); + return NULL; + } + + construct(pin, id, en, ctx); + return &pin->base.base; +} |