dc/gpio/hw_generic.c

0001 /*
0002  * Copyright 2012-15 Advanced Micro Devices, Inc.
0003  *
0004  * Permission is hereby granted, free of charge, to any person obtaining a
0005  * copy of this software and associated documentation files (the "Software"),
0006  * to deal in the Software without restriction, including without limitation
0007  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
0008  * and/or sell copies of the Software, and to permit persons to whom the
0009  * Software is furnished to do so, subject to the following conditions:
0010  *
0011  * The above copyright notice and this permission notice shall be included in
0012  * all copies or substantial portions of the Software.
0013  *
0014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
0015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
0016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
0017  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
0018  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
0019  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
0020  * OTHER DEALINGS IN THE SOFTWARE.
0021  *
0022  * Authors: AMD
0023  *
0024  */
0025
0026 #include <linux/slab.h>
0027
0028 #include "dm_services.h"
0029
0030 #include "include/gpio_interface.h"
0031 #include "include/gpio_types.h"
0032 #include "hw_gpio.h"
0033 #include "hw_generic.h"
0034
0035 #include "reg_helper.h"
0036 #include "generic_regs.h"
0037
0038 #undef FN
0039 #define FN(reg_name, field_name) \
0040     generic->shifts->field_name, generic->masks->field_name
0041
0042 #define CTX \
0043     generic->base.base.ctx
0044 #define REG(reg)\
0045     (generic->regs->reg)
0046
0047 struct gpio;
0048
0049 static void dal_hw_generic_destruct(
0050     struct hw_generic *pin)
0051 {
0052     dal_hw_gpio_destruct(&pin->base);
0053 }
0054
0055 static void dal_hw_generic_destroy(
0056     struct hw_gpio_pin **ptr)
0057 {
0058     struct hw_generic *generic = HW_GENERIC_FROM_BASE(*ptr);
0059
0060     dal_hw_generic_destruct(generic);
0061
0062     kfree(generic);
0063
0064     *ptr = NULL;
0065 }
0066
0067 static enum gpio_result set_config(
0068     struct hw_gpio_pin *ptr,
0069     const struct gpio_config_data *config_data)
0070 {
0071     struct hw_generic *generic = HW_GENERIC_FROM_BASE(ptr);
0072
0073     if (!config_data)
0074         return GPIO_RESULT_INVALID_DATA;
0075
0076     REG_UPDATE_2(mux,
0077         GENERIC_EN, config_data->config.generic_mux.enable_output_from_mux,
0078         GENERIC_SEL, config_data->config.generic_mux.mux_select);
0079
0080     return GPIO_RESULT_OK;
0081 }
0082
0083 static const struct hw_gpio_pin_funcs funcs = {
0084     .destroy = dal_hw_generic_destroy,
0085     .open = dal_hw_gpio_open,
0086     .get_value = dal_hw_gpio_get_value,
0087     .set_value = dal_hw_gpio_set_value,
0088     .set_config = set_config,
0089     .change_mode = dal_hw_gpio_change_mode,
0090     .close = dal_hw_gpio_close,
0091 };
0092
0093 static void dal_hw_generic_construct(
0094     struct hw_generic *pin,
0095     enum gpio_id id,
0096     uint32_t en,
0097     struct dc_context *ctx)
0098 {
0099     dal_hw_gpio_construct(&pin->base, id, en, ctx);
0100     pin->base.base.funcs = &funcs;
0101 }
0102
0103 void dal_hw_generic_init(
0104     struct hw_generic **hw_generic,
0105     struct dc_context *ctx,
0106     enum gpio_id id,
0107     uint32_t en)
0108 {
0109     if ((en < GPIO_DDC_LINE_MIN) || (en > GPIO_DDC_LINE_MAX)) {
0110         ASSERT_CRITICAL(false);
0111         *hw_generic = NULL;
0112     }
0113
0114     *hw_generic = kzalloc(sizeof(struct hw_generic), GFP_KERNEL);
0115     if (!*hw_generic) {
0116         ASSERT_CRITICAL(false);
0117         return;
0118     }
0119
0120     dal_hw_generic_construct(*hw_generic, id, en, ctx);
0121 }
0122
0123
0124 struct hw_gpio_pin *dal_hw_generic_get_pin(struct gpio *gpio)
0125 {
0126     struct hw_generic *hw_generic = dal_gpio_get_generic(gpio);
0127
0128     return &hw_generic->base.base;
0129 }