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/*
* 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 <linux/delay.h>
#include <linux/slab.h>
#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;
}
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