diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/i2caux/dce110/i2c_hw_engine_dce110.c')
-rw-r--r-- | drivers/gpu/drm/amd/display/dc/i2caux/dce110/i2c_hw_engine_dce110.c | 574 |
1 files changed, 0 insertions, 574 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/i2caux/dce110/i2c_hw_engine_dce110.c b/drivers/gpu/drm/amd/display/dc/i2caux/dce110/i2c_hw_engine_dce110.c deleted file mode 100644 index 9cbe1a7a6bcb..000000000000 --- a/drivers/gpu/drm/amd/display/dc/i2caux/dce110/i2c_hw_engine_dce110.c +++ /dev/null @@ -1,574 +0,0 @@ -/* - * 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/logger_interface.h" -/* - * Pre-requisites: headers required by header of this unit - */ - -#include "include/i2caux_interface.h" -#include "../engine.h" -#include "../i2c_engine.h" -#include "../i2c_hw_engine.h" -#include "../i2c_generic_hw_engine.h" -/* - * Header of this unit - */ - -#include "i2c_hw_engine_dce110.h" - -/* - * Post-requisites: headers required by this unit - */ -#include "reg_helper.h" - -/* - * This unit - */ -#define DC_LOGGER \ - hw_engine->base.base.base.ctx->logger - -enum dc_i2c_status { - DC_I2C_STATUS__DC_I2C_STATUS_IDLE, - DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_SW, - DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_HW -}; - -enum dc_i2c_arbitration { - DC_I2C_ARBITRATION__DC_I2C_SW_PRIORITY_NORMAL, - DC_I2C_ARBITRATION__DC_I2C_SW_PRIORITY_HIGH -}; - - - -/* - * @brief - * Cast pointer to 'struct i2c_hw_engine *' - * to pointer 'struct i2c_hw_engine_dce110 *' - */ -#define FROM_I2C_HW_ENGINE(ptr) \ - container_of((ptr), struct i2c_hw_engine_dce110, base) -/* - * @brief - * Cast pointer to 'struct i2c_engine *' - * to pointer to 'struct i2c_hw_engine_dce110 *' - */ -#define FROM_I2C_ENGINE(ptr) \ - FROM_I2C_HW_ENGINE(container_of((ptr), struct i2c_hw_engine, base)) - -/* - * @brief - * Cast pointer to 'struct engine *' - * to 'pointer to struct i2c_hw_engine_dce110 *' - */ -#define FROM_ENGINE(ptr) \ - FROM_I2C_ENGINE(container_of((ptr), struct i2c_engine, base)) - -#define CTX \ - hw_engine->base.base.base.ctx - -#define REG(reg_name)\ - (hw_engine->regs->reg_name) - -#undef FN -#define FN(reg_name, field_name) \ - hw_engine->i2c_shift->field_name, hw_engine->i2c_mask->field_name - -#include "reg_helper.h" - -static void disable_i2c_hw_engine( - struct i2c_hw_engine_dce110 *hw_engine) -{ - REG_UPDATE_N(SETUP, 1, FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_ENABLE), 0); -} - -static void release_engine( - struct engine *engine) -{ - struct i2c_hw_engine_dce110 *hw_engine = FROM_ENGINE(engine); - - struct i2c_engine *base = NULL; - bool safe_to_reset; - - base = &hw_engine->base.base; - - /* Restore original HW engine speed */ - - base->funcs->set_speed(base, hw_engine->base.original_speed); - - /* Release I2C */ - REG_UPDATE(DC_I2C_ARBITRATION, DC_I2C_SW_DONE_USING_I2C_REG, 1); - - /* Reset HW engine */ - { - uint32_t i2c_sw_status = 0; - REG_GET(DC_I2C_SW_STATUS, DC_I2C_SW_STATUS, &i2c_sw_status); - /* if used by SW, safe to reset */ - safe_to_reset = (i2c_sw_status == 1); - } - - if (safe_to_reset) - REG_UPDATE_2( - DC_I2C_CONTROL, - DC_I2C_SOFT_RESET, 1, - DC_I2C_SW_STATUS_RESET, 1); - else - REG_UPDATE(DC_I2C_CONTROL, DC_I2C_SW_STATUS_RESET, 1); - - /* HW I2c engine - clock gating feature */ - if (!hw_engine->engine_keep_power_up_count) - disable_i2c_hw_engine(hw_engine); -} - -static bool setup_engine( - struct i2c_engine *i2c_engine) -{ - struct i2c_hw_engine_dce110 *hw_engine = FROM_I2C_ENGINE(i2c_engine); - uint32_t i2c_setup_limit = I2C_SETUP_TIME_LIMIT_DCE; - uint32_t reset_length = 0; - - if (hw_engine->base.base.setup_limit != 0) - i2c_setup_limit = hw_engine->base.base.setup_limit; - - /* Program pin select */ - REG_UPDATE_6( - DC_I2C_CONTROL, - DC_I2C_GO, 0, - DC_I2C_SOFT_RESET, 0, - DC_I2C_SEND_RESET, 0, - DC_I2C_SW_STATUS_RESET, 1, - DC_I2C_TRANSACTION_COUNT, 0, - DC_I2C_DDC_SELECT, hw_engine->engine_id); - - /* Program time limit */ - if (hw_engine->base.base.send_reset_length == 0) { - /*pre-dcn*/ - REG_UPDATE_N( - SETUP, 2, - FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_TIME_LIMIT), i2c_setup_limit, - FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_ENABLE), 1); - } else { - reset_length = hw_engine->base.base.send_reset_length; - } - /* Program HW priority - * set to High - interrupt software I2C at any time - * Enable restart of SW I2C that was interrupted by HW - * disable queuing of software while I2C is in use by HW */ - REG_UPDATE_2( - DC_I2C_ARBITRATION, - DC_I2C_NO_QUEUED_SW_GO, 0, - DC_I2C_SW_PRIORITY, DC_I2C_ARBITRATION__DC_I2C_SW_PRIORITY_NORMAL); - - return true; -} - -static uint32_t get_speed( - const struct i2c_engine *i2c_engine) -{ - const struct i2c_hw_engine_dce110 *hw_engine = FROM_I2C_ENGINE(i2c_engine); - uint32_t pre_scale = 0; - - REG_GET(SPEED, DC_I2C_DDC1_PRESCALE, &pre_scale); - - /* [anaumov] it seems following is unnecessary */ - /*ASSERT(value.bits.DC_I2C_DDC1_PRESCALE);*/ - return pre_scale ? - hw_engine->reference_frequency / pre_scale : - hw_engine->base.default_speed; -} - -static void set_speed( - struct i2c_engine *i2c_engine, - uint32_t speed) -{ - struct i2c_hw_engine_dce110 *hw_engine = FROM_I2C_ENGINE(i2c_engine); - - if (speed) { - if (hw_engine->i2c_mask->DC_I2C_DDC1_START_STOP_TIMING_CNTL) - REG_UPDATE_N( - SPEED, 3, - FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_PRESCALE), hw_engine->reference_frequency / speed, - FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_THRESHOLD), 2, - FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_START_STOP_TIMING_CNTL), speed > 50 ? 2:1); - else - REG_UPDATE_N( - SPEED, 2, - FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_PRESCALE), hw_engine->reference_frequency / speed, - FN(DC_I2C_DDC1_SPEED, DC_I2C_DDC1_THRESHOLD), 2); - } -} - -static inline void reset_hw_engine(struct engine *engine) -{ - struct i2c_hw_engine_dce110 *hw_engine = FROM_ENGINE(engine); - - REG_UPDATE_2( - DC_I2C_CONTROL, - DC_I2C_SW_STATUS_RESET, 1, - DC_I2C_SW_STATUS_RESET, 1); -} - -static bool is_hw_busy(struct engine *engine) -{ - struct i2c_hw_engine_dce110 *hw_engine = FROM_ENGINE(engine); - uint32_t i2c_sw_status = 0; - - REG_GET(DC_I2C_SW_STATUS, DC_I2C_SW_STATUS, &i2c_sw_status); - if (i2c_sw_status == DC_I2C_STATUS__DC_I2C_STATUS_IDLE) - return false; - - reset_hw_engine(engine); - - REG_GET(DC_I2C_SW_STATUS, DC_I2C_SW_STATUS, &i2c_sw_status); - return i2c_sw_status != DC_I2C_STATUS__DC_I2C_STATUS_IDLE; -} - - -#define STOP_TRANS_PREDICAT \ - ((hw_engine->transaction_count == 3) || \ - (request->action == I2CAUX_TRANSACTION_ACTION_I2C_WRITE) || \ - (request->action & I2CAUX_TRANSACTION_ACTION_I2C_READ)) - -#define SET_I2C_TRANSACTION(id) \ - do { \ - REG_UPDATE_N(DC_I2C_TRANSACTION##id, 5, \ - FN(DC_I2C_TRANSACTION0, DC_I2C_STOP_ON_NACK0), 1, \ - FN(DC_I2C_TRANSACTION0, DC_I2C_START0), 1, \ - FN(DC_I2C_TRANSACTION0, DC_I2C_STOP0), STOP_TRANS_PREDICAT ? 1:0, \ - FN(DC_I2C_TRANSACTION0, DC_I2C_RW0), (0 != (request->action & I2CAUX_TRANSACTION_ACTION_I2C_READ)), \ - FN(DC_I2C_TRANSACTION0, DC_I2C_COUNT0), length); \ - if (STOP_TRANS_PREDICAT) \ - last_transaction = true; \ - } while (false) - - -static bool process_transaction( - struct i2c_hw_engine_dce110 *hw_engine, - struct i2c_request_transaction_data *request) -{ - uint32_t length = request->length; - uint8_t *buffer = request->data; - uint32_t value = 0; - - bool last_transaction = false; - - struct dc_context *ctx = NULL; - - ctx = hw_engine->base.base.base.ctx; - - - - switch (hw_engine->transaction_count) { - case 0: - SET_I2C_TRANSACTION(0); - break; - case 1: - SET_I2C_TRANSACTION(1); - break; - case 2: - SET_I2C_TRANSACTION(2); - break; - case 3: - SET_I2C_TRANSACTION(3); - break; - default: - /* TODO Warning ? */ - break; - } - - - /* Write the I2C address and I2C data - * into the hardware circular buffer, one byte per entry. - * As an example, the 7-bit I2C slave address for CRT monitor - * for reading DDC/EDID information is 0b1010001. - * For an I2C send operation, the LSB must be programmed to 0; - * for I2C receive operation, the LSB must be programmed to 1. */ - if (hw_engine->transaction_count == 0) { - value = REG_SET_4(DC_I2C_DATA, 0, - DC_I2C_DATA_RW, false, - DC_I2C_DATA, request->address, - DC_I2C_INDEX, 0, - DC_I2C_INDEX_WRITE, 1); - hw_engine->buffer_used_write = 0; - } else - value = REG_SET_2(DC_I2C_DATA, 0, - DC_I2C_DATA_RW, false, - DC_I2C_DATA, request->address); - - hw_engine->buffer_used_write++; - - if (!(request->action & I2CAUX_TRANSACTION_ACTION_I2C_READ)) { - while (length) { - REG_SET_2(DC_I2C_DATA, value, - DC_I2C_INDEX_WRITE, 0, - DC_I2C_DATA, *buffer++); - hw_engine->buffer_used_write++; - --length; - } - } - - ++hw_engine->transaction_count; - hw_engine->buffer_used_bytes += length + 1; - - return last_transaction; -} - -static void execute_transaction( - struct i2c_hw_engine_dce110 *hw_engine) -{ - REG_UPDATE_N(SETUP, 5, - FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_DATA_DRIVE_EN), 0, - FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_CLK_DRIVE_EN), 0, - FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_DATA_DRIVE_SEL), 0, - FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_INTRA_TRANSACTION_DELAY), 0, - FN(DC_I2C_DDC1_SETUP, DC_I2C_DDC1_INTRA_BYTE_DELAY), 0); - - - REG_UPDATE_5(DC_I2C_CONTROL, - DC_I2C_SOFT_RESET, 0, - DC_I2C_SW_STATUS_RESET, 0, - DC_I2C_SEND_RESET, 0, - DC_I2C_GO, 0, - DC_I2C_TRANSACTION_COUNT, hw_engine->transaction_count - 1); - - /* start I2C transfer */ - REG_UPDATE(DC_I2C_CONTROL, DC_I2C_GO, 1); - - /* all transactions were executed and HW buffer became empty - * (even though it actually happens when status becomes DONE) */ - hw_engine->transaction_count = 0; - hw_engine->buffer_used_bytes = 0; -} - -static void submit_channel_request( - struct i2c_engine *engine, - struct i2c_request_transaction_data *request) -{ - request->status = I2C_CHANNEL_OPERATION_SUCCEEDED; - - if (!process_transaction(FROM_I2C_ENGINE(engine), request)) - return; - - if (is_hw_busy(&engine->base)) { - request->status = I2C_CHANNEL_OPERATION_ENGINE_BUSY; - return; - } - - execute_transaction(FROM_I2C_ENGINE(engine)); -} - -static void process_channel_reply( - struct i2c_engine *engine, - struct i2c_reply_transaction_data *reply) -{ - uint32_t length = reply->length; - uint8_t *buffer = reply->data; - - struct i2c_hw_engine_dce110 *hw_engine = - FROM_I2C_ENGINE(engine); - - - REG_SET_3(DC_I2C_DATA, 0, - DC_I2C_INDEX, hw_engine->buffer_used_write, - DC_I2C_DATA_RW, 1, - DC_I2C_INDEX_WRITE, 1); - - while (length) { - /* after reading the status, - * if the I2C operation executed successfully - * (i.e. DC_I2C_STATUS_DONE = 1) then the I2C controller - * should read data bytes from I2C circular data buffer */ - - uint32_t i2c_data; - - REG_GET(DC_I2C_DATA, DC_I2C_DATA, &i2c_data); - *buffer++ = i2c_data; - - --length; - } -} - -static enum i2c_channel_operation_result get_channel_status( - struct i2c_engine *i2c_engine, - uint8_t *returned_bytes) -{ - uint32_t i2c_sw_status = 0; - struct i2c_hw_engine_dce110 *hw_engine = FROM_I2C_ENGINE(i2c_engine); - uint32_t value = - REG_GET(DC_I2C_SW_STATUS, DC_I2C_SW_STATUS, &i2c_sw_status); - - if (i2c_sw_status == DC_I2C_STATUS__DC_I2C_STATUS_USED_BY_SW) - return I2C_CHANNEL_OPERATION_ENGINE_BUSY; - else if (value & hw_engine->i2c_mask->DC_I2C_SW_STOPPED_ON_NACK) - return I2C_CHANNEL_OPERATION_NO_RESPONSE; - else if (value & hw_engine->i2c_mask->DC_I2C_SW_TIMEOUT) - return I2C_CHANNEL_OPERATION_TIMEOUT; - else if (value & hw_engine->i2c_mask->DC_I2C_SW_ABORTED) - return I2C_CHANNEL_OPERATION_FAILED; - else if (value & hw_engine->i2c_mask->DC_I2C_SW_DONE) - return I2C_CHANNEL_OPERATION_SUCCEEDED; - - /* - * this is the case when HW used for communication, I2C_SW_STATUS - * could be zero - */ - return I2C_CHANNEL_OPERATION_SUCCEEDED; -} - -static uint32_t get_hw_buffer_available_size( - const struct i2c_hw_engine *engine) -{ - return I2C_HW_BUFFER_SIZE - - FROM_I2C_HW_ENGINE(engine)->buffer_used_bytes; -} - -static uint32_t get_transaction_timeout( - const struct i2c_hw_engine *engine, - uint32_t length) -{ - uint32_t speed = engine->base.funcs->get_speed(&engine->base); - - uint32_t period_timeout; - uint32_t num_of_clock_stretches; - - if (!speed) - return 0; - - period_timeout = (1000 * TRANSACTION_TIMEOUT_IN_I2C_CLOCKS) / speed; - - num_of_clock_stretches = 1 + (length << 3) + 1; - num_of_clock_stretches += - (FROM_I2C_HW_ENGINE(engine)->buffer_used_bytes << 3) + - (FROM_I2C_HW_ENGINE(engine)->transaction_count << 1); - - return period_timeout * num_of_clock_stretches; -} - -static void destroy( - struct i2c_engine **i2c_engine) -{ - struct i2c_hw_engine_dce110 *engine_dce110 = - FROM_I2C_ENGINE(*i2c_engine); - - dal_i2c_hw_engine_destruct(&engine_dce110->base); - - kfree(engine_dce110); - - *i2c_engine = NULL; -} - -static const struct i2c_engine_funcs i2c_engine_funcs = { - .destroy = destroy, - .get_speed = get_speed, - .set_speed = set_speed, - .setup_engine = setup_engine, - .submit_channel_request = submit_channel_request, - .process_channel_reply = process_channel_reply, - .get_channel_status = get_channel_status, - .acquire_engine = dal_i2c_hw_engine_acquire_engine, -}; - -static const struct engine_funcs engine_funcs = { - .release_engine = release_engine, - .get_engine_type = dal_i2c_hw_engine_get_engine_type, - .acquire = dal_i2c_engine_acquire, - .submit_request = dal_i2c_hw_engine_submit_request, -}; - -static const struct i2c_hw_engine_funcs i2c_hw_engine_funcs = { - .get_hw_buffer_available_size = get_hw_buffer_available_size, - .get_transaction_timeout = get_transaction_timeout, - .wait_on_operation_result = dal_i2c_hw_engine_wait_on_operation_result, -}; - -static void construct( - struct i2c_hw_engine_dce110 *hw_engine, - const struct i2c_hw_engine_dce110_create_arg *arg) -{ - uint32_t xtal_ref_div = 0; - - dal_i2c_hw_engine_construct(&hw_engine->base, arg->ctx); - - hw_engine->base.base.base.funcs = &engine_funcs; - hw_engine->base.base.funcs = &i2c_engine_funcs; - hw_engine->base.funcs = &i2c_hw_engine_funcs; - hw_engine->base.default_speed = arg->default_speed; - - hw_engine->regs = arg->regs; - hw_engine->i2c_shift = arg->i2c_shift; - hw_engine->i2c_mask = arg->i2c_mask; - - hw_engine->engine_id = arg->engine_id; - - hw_engine->buffer_used_bytes = 0; - hw_engine->transaction_count = 0; - hw_engine->engine_keep_power_up_count = 1; - - - REG_GET(MICROSECOND_TIME_BASE_DIV, XTAL_REF_DIV, &xtal_ref_div); - - if (xtal_ref_div == 0) { - DC_LOG_WARNING("Invalid base timer divider [%s]\n", - __func__); - xtal_ref_div = 2; - } - - /*Calculating Reference Clock by divding original frequency by - * XTAL_REF_DIV. - * At upper level, uint32_t reference_frequency = - * dal_i2caux_get_reference_clock(as) >> 1 - * which already divided by 2. So we need x2 to get original - * reference clock from ppll_info - */ - hw_engine->reference_frequency = - (arg->reference_frequency * 2) / xtal_ref_div; -} - -struct i2c_engine *dal_i2c_hw_engine_dce110_create( - const struct i2c_hw_engine_dce110_create_arg *arg) -{ - struct i2c_hw_engine_dce110 *engine_dce10; - - if (!arg) { - ASSERT_CRITICAL(false); - return NULL; - } - if (!arg->reference_frequency) { - ASSERT_CRITICAL(false); - return NULL; - } - - engine_dce10 = kzalloc(sizeof(struct i2c_hw_engine_dce110), - GFP_KERNEL); - - if (!engine_dce10) { - ASSERT_CRITICAL(false); - return NULL; - } - - construct(engine_dce10, arg); - return &engine_dce10->base.base; -} |