// SPDX-License-Identifier: GPL-2.0
/*
 * Support for Intel Camera Imaging ISP subsystem.
 * Copyright (c) 2010-015, Intel Corporation.
 */

#include "system_global.h"


#include "input_system.h"
#include <type_support.h>
#include "gp_device.h"

#include "assert_support.h"

#ifndef __INLINE_INPUT_SYSTEM__
#include "input_system_private.h"
#endif /* __INLINE_INPUT_SYSTEM__ */

#define ZERO (0x0)
#define ONE  (1U)

static const isp2400_ib_buffer_t   IB_BUFFER_NULL = {0, 0, 0 };

static input_system_err_t input_system_configure_channel(
    const channel_cfg_t         channel);

static input_system_err_t input_system_configure_channel_sensor(
    const channel_cfg_t         channel);

static input_system_err_t input_buffer_configuration(void);

static input_system_err_t configuration_to_registers(void);

static void receiver_rst(const rx_ID_t ID);
static void input_system_network_rst(const input_system_ID_t ID);

static void capture_unit_configure(
    const input_system_ID_t                     ID,
    const sub_system_ID_t                       sub_id,
    const isp2400_ib_buffer_t *const cfg);

static void acquisition_unit_configure(
    const input_system_ID_t                     ID,
    const sub_system_ID_t                       sub_id,
    const isp2400_ib_buffer_t *const cfg);

static void ctrl_unit_configure(
    const input_system_ID_t                     ID,
    const sub_system_ID_t                       sub_id,
    const ctrl_unit_cfg_t *const cfg);

static void input_system_network_configure(
    const input_system_ID_t                     ID,
    const input_system_network_cfg_t *const cfg);

// MW: CSI is previously named as "rx" short for "receiver"
static input_system_err_t set_csi_cfg(
    csi_cfg_t *const lhs,
    const csi_cfg_t *const rhs,
    input_system_config_flags_t *const flags);

static input_system_err_t set_source_type(
    input_system_source_t *const lhs,
    const input_system_source_t                         rhs,
    input_system_config_flags_t *const flags);

static input_system_err_t input_system_multiplexer_cfg(
    input_system_multiplex_t *const lhs,
    const input_system_multiplex_t                      rhs,
    input_system_config_flags_t *const flags);

static void gp_device_rst(const gp_device_ID_t          ID);

static void input_selector_cfg_for_sensor(const gp_device_ID_t  ID);

static void input_switch_rst(const gp_device_ID_t       ID);

static void input_switch_cfg(
    const gp_device_ID_t                                ID,
    const input_switch_cfg_t *const cfg
);

void receiver_set_compression(
    const rx_ID_t                       ID,
    const unsigned int          cfg_ID,
    const mipi_compressor_t             comp,
    const mipi_predictor_t              pred)
{
        const unsigned int              field_id = cfg_ID % N_MIPI_FORMAT_CUSTOM;
        const unsigned int              ch_id = cfg_ID / N_MIPI_FORMAT_CUSTOM;
        hrt_data                        val;
        hrt_address                     addr = 0;
        hrt_data                        reg;

        assert(ID < N_RX_ID);
        assert(cfg_ID < N_MIPI_COMPRESSOR_CONTEXT);
        assert(field_id < N_MIPI_FORMAT_CUSTOM);
        assert(ch_id < N_RX_CHANNEL_ID);
        assert(comp < N_MIPI_COMPRESSOR_METHODS);
        assert(pred < N_MIPI_PREDICTOR_TYPES);

        val = (((uint8_t)pred) << 3) | comp;

        switch (ch_id) {
        case 0:
                addr = ((field_id < 6) ? _HRT_CSS_RECEIVER_2400_COMP_SCHEME_VC0_REG0_IDX :
                        _HRT_CSS_RECEIVER_2400_COMP_SCHEME_VC0_REG1_IDX);
                break;
        case 1:
                addr = ((field_id < 6) ? _HRT_CSS_RECEIVER_2400_COMP_SCHEME_VC1_REG0_IDX :
                        _HRT_CSS_RECEIVER_2400_COMP_SCHEME_VC1_REG1_IDX);
                break;
        case 2:
                addr = ((field_id < 6) ? _HRT_CSS_RECEIVER_2400_COMP_SCHEME_VC2_REG0_IDX :
                        _HRT_CSS_RECEIVER_2400_COMP_SCHEME_VC2_REG1_IDX);
                break;
        case 3:
                addr = ((field_id < 6) ? _HRT_CSS_RECEIVER_2400_COMP_SCHEME_VC3_REG0_IDX :
                        _HRT_CSS_RECEIVER_2400_COMP_SCHEME_VC3_REG1_IDX);
                break;
        default:
                /* should not happen */
                assert(false);
                return;
        }

        reg = ((field_id < 6) ? (val << (field_id * 5)) : (val << ((
                    field_id - 6) * 5)));
        receiver_reg_store(ID, addr, reg);
}

void receiver_port_enable(
    const rx_ID_t                       ID,
    const enum mipi_port_id             port_ID,
    const bool                  cnd)
{
        hrt_data        reg = receiver_port_reg_load(ID, port_ID,
                          _HRT_CSS_RECEIVER_DEVICE_READY_REG_IDX);

        if (cnd) {
                reg |= 0x01;
        } else {
                reg &= ~0x01;
        }

        receiver_port_reg_store(ID, port_ID,
                                _HRT_CSS_RECEIVER_DEVICE_READY_REG_IDX, reg);
}

bool is_receiver_port_enabled(
    const rx_ID_t                       ID,
    const enum mipi_port_id             port_ID)
{
        hrt_data        reg = receiver_port_reg_load(ID, port_ID,
                          _HRT_CSS_RECEIVER_DEVICE_READY_REG_IDX);
        return ((reg & 0x01) != 0);
}

void receiver_irq_enable(
    const rx_ID_t                       ID,
    const enum mipi_port_id             port_ID,
    const rx_irq_info_t         irq_info)
{
        receiver_port_reg_store(ID,
                                port_ID, _HRT_CSS_RECEIVER_IRQ_ENABLE_REG_IDX, irq_info);
}

rx_irq_info_t receiver_get_irq_info(
    const rx_ID_t                       ID,
    const enum mipi_port_id             port_ID)
{
        return receiver_port_reg_load(ID,
                                      port_ID, _HRT_CSS_RECEIVER_IRQ_STATUS_REG_IDX);
}

void receiver_irq_clear(
    const rx_ID_t                       ID,
    const enum mipi_port_id             port_ID,
    const rx_irq_info_t         irq_info)
{
        receiver_port_reg_store(ID,
                                port_ID, _HRT_CSS_RECEIVER_IRQ_STATUS_REG_IDX, irq_info);
}

// MW: "2400" in the name is not good, but this is to avoid a naming conflict
static input_system_cfg2400_t config;

static void receiver_rst(
    const rx_ID_t                               ID)
{
        enum mipi_port_id               port_id;

        assert(ID < N_RX_ID);

// Disable all ports.
        for (port_id = MIPI_PORT0_ID; port_id < N_MIPI_PORT_ID; port_id++) {
                receiver_port_enable(ID, port_id, false);
        }

        // AM: Additional actions for stopping receiver?
}

//Single function to reset all the devices mapped via GP_DEVICE.
static void gp_device_rst(const gp_device_ID_t          ID)
{
        assert(ID < N_GP_DEVICE_ID);

        gp_device_reg_store(ID, _REG_GP_SYNCGEN_ENABLE_ADDR, ZERO);
        // gp_device_reg_store(ID, _REG_GP_SYNCGEN_FREE_RUNNING_ADDR, ZERO);
        // gp_device_reg_store(ID, _REG_GP_SYNCGEN_PAUSE_ADDR, ONE);
        // gp_device_reg_store(ID, _REG_GP_NR_FRAMES_ADDR, ZERO);
        // gp_device_reg_store(ID, _REG_GP_SYNGEN_NR_PIX_ADDR, ZERO);
        // gp_device_reg_store(ID, _REG_GP_SYNGEN_NR_PIX_ADDR, ZERO);
        // gp_device_reg_store(ID, _REG_GP_SYNGEN_NR_LINES_ADDR, ZERO);
        // gp_device_reg_store(ID, _REG_GP_SYNGEN_HBLANK_CYCLES_ADDR, ZERO);
        // gp_device_reg_store(ID, _REG_GP_SYNGEN_VBLANK_CYCLES_ADDR, ZERO);
// AM: Following calls cause strange warnings. Probably they should not be initialized.
//      gp_device_reg_store(ID, _REG_GP_ISEL_SOF_ADDR, ZERO);
//      gp_device_reg_store(ID, _REG_GP_ISEL_EOF_ADDR, ZERO);
//      gp_device_reg_store(ID, _REG_GP_ISEL_SOL_ADDR, ZERO);
//      gp_device_reg_store(ID, _REG_GP_ISEL_EOL_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_LFSR_ENABLE_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_LFSR_ENABLE_B_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_LFSR_RESET_VALUE_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_TPG_ENABLE_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_TPG_ENABLE_B_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_HOR_CNT_MASK_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_VER_CNT_MASK_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_XY_CNT_MASK_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_HOR_CNT_DELTA_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_VER_CNT_DELTA_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_TPG_MODE_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_TPG_RED1_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_TPG_GREEN1_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_TPG_BLUE1_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_TPG_RED2_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_TPG_GREEN2_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_TPG_BLUE2_ADDR, ZERO);
        //gp_device_reg_store(ID, _REG_GP_ISEL_CH_ID_ADDR, ZERO);
        //gp_device_reg_store(ID, _REG_GP_ISEL_FMT_TYPE_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_DATA_SEL_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_SBAND_SEL_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_SYNC_SEL_ADDR, ZERO);
        //      gp_device_reg_store(ID, _REG_GP_SYNCGEN_HOR_CNT_ADDR, ZERO);
        //      gp_device_reg_store(ID, _REG_GP_SYNCGEN_VER_CNT_ADDR, ZERO);
        //      gp_device_reg_store(ID, _REG_GP_SYNCGEN_FRAME_CNT_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_SOFT_RESET_ADDR,
                            ZERO); // AM: Maybe this soft reset is not safe.
}

static void input_selector_cfg_for_sensor(const gp_device_ID_t ID)
{
        assert(ID < N_GP_DEVICE_ID);

        gp_device_reg_store(ID, _REG_GP_ISEL_SOF_ADDR, ONE);
        gp_device_reg_store(ID, _REG_GP_ISEL_EOF_ADDR, ONE);
        gp_device_reg_store(ID, _REG_GP_ISEL_SOL_ADDR, ONE);
        gp_device_reg_store(ID, _REG_GP_ISEL_EOL_ADDR, ONE);
        gp_device_reg_store(ID, _REG_GP_ISEL_CH_ID_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_FMT_TYPE_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_DATA_SEL_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_SBAND_SEL_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_ISEL_SYNC_SEL_ADDR, ZERO);
        gp_device_reg_store(ID, _REG_GP_SOFT_RESET_ADDR, ZERO);
}

static void input_switch_rst(const gp_device_ID_t ID)
{
        int addr;

        assert(ID < N_GP_DEVICE_ID);

        // Initialize the data&hsync LUT.
        for (addr = _REG_GP_IFMT_input_switch_lut_reg0;
             addr <= _REG_GP_IFMT_input_switch_lut_reg7; addr += SIZEOF_HRT_REG) {
                gp_device_reg_store(ID, addr, ZERO);
        }

        // Initialize the vsync LUT.
        gp_device_reg_store(ID,
                            _REG_GP_IFMT_input_switch_fsync_lut,
                            ZERO);
}

static void input_switch_cfg(
    const gp_device_ID_t                        ID,
    const input_switch_cfg_t *const cfg)
{
        int addr_offset;

        assert(ID < N_GP_DEVICE_ID);
        assert(cfg);

        // Initialize the data&hsync LUT.
        for (addr_offset = 0; addr_offset < N_RX_CHANNEL_ID * 2; addr_offset++) {
                assert(addr_offset * SIZEOF_HRT_REG + _REG_GP_IFMT_input_switch_lut_reg0 <=
                       _REG_GP_IFMT_input_switch_lut_reg7);
                gp_device_reg_store(ID,
                                    _REG_GP_IFMT_input_switch_lut_reg0 + addr_offset * SIZEOF_HRT_REG,
                                    cfg->hsync_data_reg[addr_offset]);
        }

        // Initialize the vsync LUT.
        gp_device_reg_store(ID,
                            _REG_GP_IFMT_input_switch_fsync_lut,
                            cfg->vsync_data_reg);
}

static void input_system_network_rst(const input_system_ID_t ID)
{
        unsigned int sub_id;

        // Reset all 3 multicasts.
        input_system_sub_system_reg_store(ID,
                                          GPREGS_UNIT0_ID,
                                          HIVE_ISYS_GPREG_MULTICAST_A_IDX,
                                          INPUT_SYSTEM_DISCARD_ALL);
        input_system_sub_system_reg_store(ID,
                                          GPREGS_UNIT0_ID,
                                          HIVE_ISYS_GPREG_MULTICAST_B_IDX,
                                          INPUT_SYSTEM_DISCARD_ALL);
        input_system_sub_system_reg_store(ID,
                                          GPREGS_UNIT0_ID,
                                          HIVE_ISYS_GPREG_MULTICAST_C_IDX,
                                          INPUT_SYSTEM_DISCARD_ALL);

        // Reset stream mux.
        input_system_sub_system_reg_store(ID,
                                          GPREGS_UNIT0_ID,
                                          HIVE_ISYS_GPREG_MUX_IDX,
                                          N_INPUT_SYSTEM_MULTIPLEX);

        // Reset 3 capture units.
        for (sub_id = CAPTURE_UNIT0_ID; sub_id < CAPTURE_UNIT0_ID + N_CAPTURE_UNIT_ID;
             sub_id++) {
                input_system_sub_system_reg_store(ID,
                                                  sub_id,
                                                  CAPT_INIT_REG_ID,
                                                  1U << CAPT_INIT_RST_REG_BIT);
        }

        // Reset acquisition unit.
        for (sub_id = ACQUISITION_UNIT0_ID;
             sub_id < ACQUISITION_UNIT0_ID + N_ACQUISITION_UNIT_ID; sub_id++) {
                input_system_sub_system_reg_store(ID,
                                                  sub_id,
                                                  ACQ_INIT_REG_ID,
                                                  1U << ACQ_INIT_RST_REG_BIT);
        }

        // DMA unit reset is not needed.

        // Reset controller units.
        // NB: In future we need to keep part of ctrl_state for split capture and
        for (sub_id = CTRL_UNIT0_ID; sub_id < CTRL_UNIT0_ID + N_CTRL_UNIT_ID;
             sub_id++) {
                input_system_sub_system_reg_store(ID,
                                                  sub_id,
                                                  ISYS_CTRL_INIT_REG_ID,
                                                  1U); //AM: Is there any named constant?
        }
}

// Function that resets current configuration.
input_system_err_t input_system_configuration_reset(void)
{
        unsigned int i;

        receiver_rst(RX0_ID);

        input_system_network_rst(INPUT_SYSTEM0_ID);

        gp_device_rst(GP_DEVICE0_ID);

        input_switch_rst(GP_DEVICE0_ID);

        //target_rst();

        // Reset IRQ_CTRLs.

        // Reset configuration data structures.
        for (i = 0; i < N_CHANNELS; i++) {
                config.ch_flags[i] = INPUT_SYSTEM_CFG_FLAG_RESET;
                config.target_isp_flags[i] = INPUT_SYSTEM_CFG_FLAG_RESET;
                config.target_sp_flags[i] = INPUT_SYSTEM_CFG_FLAG_RESET;
                config.target_strm2mem_flags[i] = INPUT_SYSTEM_CFG_FLAG_RESET;
        }

        for (i = 0; i < N_CSI_PORTS; i++) {
                config.csi_buffer_flags[i]       = INPUT_SYSTEM_CFG_FLAG_RESET;
                config.multicast[i]              = INPUT_SYSTEM_DISCARD_ALL;
        }

        config.source_type_flags                                 = INPUT_SYSTEM_CFG_FLAG_RESET;
        config.acquisition_buffer_unique_flags   = INPUT_SYSTEM_CFG_FLAG_RESET;
        config.unallocated_ib_mem_words                  = IB_CAPACITY_IN_WORDS;
        //config.acq_allocated_ib_mem_words              = 0;

        /* Set the start of the session configuration. */
        config.session_flags = INPUT_SYSTEM_CFG_FLAG_REQUIRED;

        return INPUT_SYSTEM_ERR_NO_ERROR;
}

// MW: Comments are good, but doxygen is required, place it at the declaration
// Function that appends the channel to current configuration.
static input_system_err_t input_system_configure_channel(
    const channel_cfg_t         channel)
{
        input_system_err_t error = INPUT_SYSTEM_ERR_NO_ERROR;
        // Check if channel is not already configured.
        if (config.ch_flags[channel.ch_id] & INPUT_SYSTEM_CFG_FLAG_SET) {
                return INPUT_SYSTEM_ERR_CHANNEL_ALREADY_SET;
        } else {
                switch (channel.source_type) {
                case INPUT_SYSTEM_SOURCE_SENSOR:
                        error = input_system_configure_channel_sensor(channel);
                        break;
                case INPUT_SYSTEM_SOURCE_PRBS:
                case INPUT_SYSTEM_SOURCE_FIFO:
                default:
                        return INPUT_SYSTEM_ERR_PARAMETER_NOT_SUPPORTED;
                }

                if (error != INPUT_SYSTEM_ERR_NO_ERROR) return error;
                // Input switch channel configurations must be combined in united config.
                config.input_switch_cfg.hsync_data_reg[channel.source_cfg.csi_cfg.csi_port * 2]
                    =
                        channel.target_cfg.input_switch_channel_cfg.hsync_data_reg[0];
                config.input_switch_cfg.hsync_data_reg[channel.source_cfg.csi_cfg.csi_port * 2 +
                                                                                           1] =
                                                               channel.target_cfg.input_switch_channel_cfg.hsync_data_reg[1];
                config.input_switch_cfg.vsync_data_reg |=
                    (channel.target_cfg.input_switch_channel_cfg.vsync_data_reg & 0x7) <<
                    (channel.source_cfg.csi_cfg.csi_port * 3);

                // Other targets are just copied and marked as set.
                config.target_isp[channel.source_cfg.csi_cfg.csi_port] =
                    channel.target_cfg.target_isp_cfg;
                config.target_sp[channel.source_cfg.csi_cfg.csi_port] =
                    channel.target_cfg.target_sp_cfg;
                config.target_strm2mem[channel.source_cfg.csi_cfg.csi_port] =
                    channel.target_cfg.target_strm2mem_cfg;
                config.target_isp_flags[channel.source_cfg.csi_cfg.csi_port] |=
                    INPUT_SYSTEM_CFG_FLAG_SET;
                config.target_sp_flags[channel.source_cfg.csi_cfg.csi_port] |=
                    INPUT_SYSTEM_CFG_FLAG_SET;
                config.target_strm2mem_flags[channel.source_cfg.csi_cfg.csi_port] |=
                    INPUT_SYSTEM_CFG_FLAG_SET;

                config.ch_flags[channel.ch_id] = INPUT_SYSTEM_CFG_FLAG_SET;
        }
        return INPUT_SYSTEM_ERR_NO_ERROR;
}

// Function that partitions input buffer space with determining addresses.
static input_system_err_t input_buffer_configuration(void)
{
        u32 current_address    = 0;
        u32 unallocated_memory = IB_CAPACITY_IN_WORDS;

        isp2400_ib_buffer_t     candidate_buffer_acq  = IB_BUFFER_NULL;
        u32 size_requested;
        input_system_config_flags_t     acq_already_specified = INPUT_SYSTEM_CFG_FLAG_RESET;
        input_system_csi_port_t port;

        for (port = INPUT_SYSTEM_PORT_A; port < N_INPUT_SYSTEM_PORTS; port++) {
                csi_cfg_t source = config.csi_value[port];//.csi_cfg;

                if (config.csi_flags[port] & INPUT_SYSTEM_CFG_FLAG_SET) {
                        // Check and set csi buffer in input buffer.
                        switch (source.buffering_mode) {
                        case INPUT_SYSTEM_FIFO_CAPTURE:
                        case INPUT_SYSTEM_XMEM_ACQUIRE:
                                config.csi_buffer_flags[port] =
                                    INPUT_SYSTEM_CFG_FLAG_BLOCKED; // Well, not used.
                                break;

                        case INPUT_SYSTEM_FIFO_CAPTURE_WITH_COUNTING:
                        case INPUT_SYSTEM_SRAM_BUFFERING:
                        case INPUT_SYSTEM_XMEM_BUFFERING:
                        case INPUT_SYSTEM_XMEM_CAPTURE:
                                size_requested = source.csi_buffer.mem_reg_size *
                                                 source.csi_buffer.nof_mem_regs;
                                if (source.csi_buffer.mem_reg_size > 0
                                    && source.csi_buffer.nof_mem_regs > 0
                                    && size_requested <= unallocated_memory
                                   ) {
                                        config.csi_buffer[port].mem_reg_addr = current_address;
                                        config.csi_buffer[port].mem_reg_size = source.csi_buffer.mem_reg_size;
                                        config.csi_buffer[port].nof_mem_regs = source.csi_buffer.nof_mem_regs;
                                        current_address         += size_requested;
                                        unallocated_memory      -= size_requested;
                                        config.csi_buffer_flags[port] = INPUT_SYSTEM_CFG_FLAG_SET;
                                } else {
                                        config.csi_buffer_flags[port] |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                                        return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
                                }
                                break;

                        default:
                                config.csi_buffer_flags[port] |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                                return INPUT_SYSTEM_ERR_PARAMETER_NOT_SUPPORTED;
                        }

                        // Check acquisition buffer specified but set it later since it has to be unique.
                        switch (source.buffering_mode) {
                        case INPUT_SYSTEM_FIFO_CAPTURE:
                        case INPUT_SYSTEM_SRAM_BUFFERING:
                        case INPUT_SYSTEM_XMEM_CAPTURE:
                                // Nothing to do.
                                break;

                        case INPUT_SYSTEM_FIFO_CAPTURE_WITH_COUNTING:
                        case INPUT_SYSTEM_XMEM_BUFFERING:
                        case INPUT_SYSTEM_XMEM_ACQUIRE:
                                if (acq_already_specified == INPUT_SYSTEM_CFG_FLAG_RESET) {
                                        size_requested = source.acquisition_buffer.mem_reg_size
                                                         * source.acquisition_buffer.nof_mem_regs;
                                        if (source.acquisition_buffer.mem_reg_size > 0
                                            && source.acquisition_buffer.nof_mem_regs > 0
                                            && size_requested <= unallocated_memory
                                           ) {
                                                candidate_buffer_acq = source.acquisition_buffer;
                                                acq_already_specified = INPUT_SYSTEM_CFG_FLAG_SET;
                                        }
                                } else {
                                        // Check if specified acquisition buffer is the same as specified before.
                                        if (source.acquisition_buffer.mem_reg_size != candidate_buffer_acq.mem_reg_size
                                            || source.acquisition_buffer.nof_mem_regs !=  candidate_buffer_acq.nof_mem_regs
                                           ) {
                                                config.acquisition_buffer_unique_flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                                                return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
                                        }
                                }
                                break;

                        default:
                                return INPUT_SYSTEM_ERR_PARAMETER_NOT_SUPPORTED;
                        }
                } else {
                        config.csi_buffer_flags[port] = INPUT_SYSTEM_CFG_FLAG_BLOCKED;
                }
        } // end of for ( port )

        // Set the acquisition buffer at the end.
        size_requested = candidate_buffer_acq.mem_reg_size *
                         candidate_buffer_acq.nof_mem_regs;
        if (acq_already_specified == INPUT_SYSTEM_CFG_FLAG_SET
            && size_requested <= unallocated_memory) {
                config.acquisition_buffer_unique.mem_reg_addr = current_address;
                config.acquisition_buffer_unique.mem_reg_size =
                    candidate_buffer_acq.mem_reg_size;
                config.acquisition_buffer_unique.nof_mem_regs =
                    candidate_buffer_acq.nof_mem_regs;
                current_address         += size_requested;
                unallocated_memory      -= size_requested;
                config.acquisition_buffer_unique_flags = INPUT_SYSTEM_CFG_FLAG_SET;

                assert(current_address <= IB_CAPACITY_IN_WORDS);
        }

        return INPUT_SYSTEM_ERR_NO_ERROR;
}

static void capture_unit_configure(
    const input_system_ID_t                     ID,
    const sub_system_ID_t                       sub_id,
    const isp2400_ib_buffer_t *const cfg)
{
        assert(ID < N_INPUT_SYSTEM_ID);
        assert(/*(sub_id >= CAPTURE_UNIT0_ID) &&*/ (sub_id <=
                CAPTURE_UNIT2_ID)); // Commented part is always true.
        assert(cfg);

        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          CAPT_START_ADDR_REG_ID,
                                          cfg->mem_reg_addr);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          CAPT_MEM_REGION_SIZE_REG_ID,
                                          cfg->mem_reg_size);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          CAPT_NUM_MEM_REGIONS_REG_ID,
                                          cfg->nof_mem_regs);
}

static void acquisition_unit_configure(
    const input_system_ID_t                     ID,
    const sub_system_ID_t                       sub_id,
    const isp2400_ib_buffer_t *const cfg)
{
        assert(ID < N_INPUT_SYSTEM_ID);
        assert(sub_id == ACQUISITION_UNIT0_ID);
        assert(cfg);

        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ACQ_START_ADDR_REG_ID,
                                          cfg->mem_reg_addr);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ACQ_NUM_MEM_REGIONS_REG_ID,
                                          cfg->nof_mem_regs);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ACQ_MEM_REGION_SIZE_REG_ID,
                                          cfg->mem_reg_size);
}

static void ctrl_unit_configure(
    const input_system_ID_t                     ID,
    const sub_system_ID_t                       sub_id,
    const ctrl_unit_cfg_t *const cfg)
{
        assert(ID < N_INPUT_SYSTEM_ID);
        assert(sub_id == CTRL_UNIT0_ID);
        assert(cfg);

        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_START_ADDR_A_REG_ID,
                                          cfg->buffer_mipi[CAPTURE_UNIT0_ID].mem_reg_addr);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_MEM_REGION_SIZE_A_REG_ID,
                                          cfg->buffer_mipi[CAPTURE_UNIT0_ID].mem_reg_size);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_NUM_MEM_REGIONS_A_REG_ID,
                                          cfg->buffer_mipi[CAPTURE_UNIT0_ID].nof_mem_regs);

        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_START_ADDR_B_REG_ID,
                                          cfg->buffer_mipi[CAPTURE_UNIT1_ID].mem_reg_addr);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_MEM_REGION_SIZE_B_REG_ID,
                                          cfg->buffer_mipi[CAPTURE_UNIT1_ID].mem_reg_size);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_NUM_MEM_REGIONS_B_REG_ID,
                                          cfg->buffer_mipi[CAPTURE_UNIT1_ID].nof_mem_regs);

        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_START_ADDR_C_REG_ID,
                                          cfg->buffer_mipi[CAPTURE_UNIT2_ID].mem_reg_addr);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_MEM_REGION_SIZE_C_REG_ID,
                                          cfg->buffer_mipi[CAPTURE_UNIT2_ID].mem_reg_size);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_NUM_MEM_REGIONS_C_REG_ID,
                                          cfg->buffer_mipi[CAPTURE_UNIT2_ID].nof_mem_regs);

        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_ACQ_START_ADDR_REG_ID,
                                          cfg->buffer_acquire[ACQUISITION_UNIT0_ID - ACQUISITION_UNIT0_ID].mem_reg_addr);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_ACQ_MEM_REGION_SIZE_REG_ID,
                                          cfg->buffer_acquire[ACQUISITION_UNIT0_ID - ACQUISITION_UNIT0_ID].mem_reg_size);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_ACQ_NUM_MEM_REGIONS_REG_ID,
                                          cfg->buffer_acquire[ACQUISITION_UNIT0_ID - ACQUISITION_UNIT0_ID].nof_mem_regs);
        input_system_sub_system_reg_store(ID,
                                          sub_id,
                                          ISYS_CTRL_CAPT_RESERVE_ONE_MEM_REGION_REG_ID,
                                          0);
}

static void input_system_network_configure(
    const input_system_ID_t                             ID,
    const input_system_network_cfg_t *const cfg)
{
        u32 sub_id;

        assert(ID < N_INPUT_SYSTEM_ID);
        assert(cfg);

        // Set all 3 multicasts.
        input_system_sub_system_reg_store(ID,
                                          GPREGS_UNIT0_ID,
                                          HIVE_ISYS_GPREG_MULTICAST_A_IDX,
                                          cfg->multicast_cfg[CAPTURE_UNIT0_ID]);
        input_system_sub_system_reg_store(ID,
                                          GPREGS_UNIT0_ID,
                                          HIVE_ISYS_GPREG_MULTICAST_B_IDX,
                                          cfg->multicast_cfg[CAPTURE_UNIT1_ID]);
        input_system_sub_system_reg_store(ID,
                                          GPREGS_UNIT0_ID,
                                          HIVE_ISYS_GPREG_MULTICAST_C_IDX,
                                          cfg->multicast_cfg[CAPTURE_UNIT2_ID]);

        // Set stream mux.
        input_system_sub_system_reg_store(ID,
                                          GPREGS_UNIT0_ID,
                                          HIVE_ISYS_GPREG_MUX_IDX,
                                          cfg->mux_cfg);

        // Set capture units.
        for (sub_id = CAPTURE_UNIT0_ID; sub_id < CAPTURE_UNIT0_ID + N_CAPTURE_UNIT_ID;
             sub_id++) {
                capture_unit_configure(ID,
                                       sub_id,
                                       &cfg->ctrl_unit_cfg[ID].buffer_mipi[sub_id - CAPTURE_UNIT0_ID]);
        }

        // Set acquisition units.
        for (sub_id = ACQUISITION_UNIT0_ID;
             sub_id < ACQUISITION_UNIT0_ID + N_ACQUISITION_UNIT_ID; sub_id++) {
                acquisition_unit_configure(ID,
                                           sub_id,
                                           &cfg->ctrl_unit_cfg[sub_id - ACQUISITION_UNIT0_ID].buffer_acquire[sub_id -
                                                   ACQUISITION_UNIT0_ID]);
        }

        // No DMA configuration needed. Ctrl_unit will fully control it.

        // Set controller units.
        for (sub_id = CTRL_UNIT0_ID; sub_id < CTRL_UNIT0_ID + N_CTRL_UNIT_ID;
             sub_id++) {
                ctrl_unit_configure(ID,
                                    sub_id,
                                    &cfg->ctrl_unit_cfg[sub_id - CTRL_UNIT0_ID]);
        }
}

static input_system_err_t configuration_to_registers(void)
{
        input_system_network_cfg_t input_system_network_cfg;
        int i;

        assert(config.source_type_flags & INPUT_SYSTEM_CFG_FLAG_SET);

        switch (config.source_type) {
        case INPUT_SYSTEM_SOURCE_SENSOR:

                // Determine stream multicasts setting based on the mode of csi_cfg_t.
                // AM: This should be moved towards earlier function call, e.g. in
                // the commit function.
                for (i = MIPI_PORT0_ID; i < N_MIPI_PORT_ID; i++) {
                        if (config.csi_flags[i] & INPUT_SYSTEM_CFG_FLAG_SET) {
                                switch (config.csi_value[i].buffering_mode) {
                                case INPUT_SYSTEM_FIFO_CAPTURE:
                                        config.multicast[i] = INPUT_SYSTEM_CSI_BACKEND;
                                        break;

                                case INPUT_SYSTEM_XMEM_CAPTURE:
                                case INPUT_SYSTEM_SRAM_BUFFERING:
                                case INPUT_SYSTEM_XMEM_BUFFERING:
                                        config.multicast[i] = INPUT_SYSTEM_INPUT_BUFFER;
                                        break;

                                case INPUT_SYSTEM_FIFO_CAPTURE_WITH_COUNTING:
                                        config.multicast[i] = INPUT_SYSTEM_MULTICAST;
                                        break;

                                case INPUT_SYSTEM_XMEM_ACQUIRE:
                                        config.multicast[i] = INPUT_SYSTEM_DISCARD_ALL;
                                        break;

                                default:
                                        config.multicast[i] = INPUT_SYSTEM_DISCARD_ALL;
                                        return INPUT_SYSTEM_ERR_PARAMETER_NOT_SUPPORTED;
                                        //break;
                                }
                        } else {
                                config.multicast[i] = INPUT_SYSTEM_DISCARD_ALL;
                        }

                        input_system_network_cfg.multicast_cfg[i] = config.multicast[i];

                } // for

                input_system_network_cfg.mux_cfg = config.multiplexer;

                input_system_network_cfg.ctrl_unit_cfg[CTRL_UNIT0_ID -
                                                       CTRL_UNIT0_ID].buffer_mipi[CAPTURE_UNIT0_ID] =
                                                               config.csi_buffer[MIPI_PORT0_ID];
                input_system_network_cfg.ctrl_unit_cfg[CTRL_UNIT0_ID -
                                                       CTRL_UNIT0_ID].buffer_mipi[CAPTURE_UNIT1_ID] =
                                                               config.csi_buffer[MIPI_PORT1_ID];
                input_system_network_cfg.ctrl_unit_cfg[CTRL_UNIT0_ID -
                                                       CTRL_UNIT0_ID].buffer_mipi[CAPTURE_UNIT2_ID] =
                                                               config.csi_buffer[MIPI_PORT2_ID];
                input_system_network_cfg.ctrl_unit_cfg[CTRL_UNIT0_ID -
                                                       CTRL_UNIT0_ID].buffer_acquire[ACQUISITION_UNIT0_ID -
                                                               ACQUISITION_UNIT0_ID] =
                                                                       config.acquisition_buffer_unique;

                // First set input network around CSI receiver.
                input_system_network_configure(INPUT_SYSTEM0_ID, &input_system_network_cfg);

                // Set the CSI receiver.
                //...
                break;

        case INPUT_SYSTEM_SOURCE_PRBS:
        case INPUT_SYSTEM_SOURCE_FIFO:
                break;

        default:
                return INPUT_SYSTEM_ERR_PARAMETER_NOT_SUPPORTED;

        } // end of switch (source_type)

        // Set input selector.
        input_selector_cfg_for_sensor(GP_DEVICE0_ID);

        // Set input switch.
        input_switch_cfg(GP_DEVICE0_ID, &config.input_switch_cfg);

        // Set input formatters.
        // AM: IF are set dynamically.
        return INPUT_SYSTEM_ERR_NO_ERROR;
}

// Function that applies the whole configuration.
input_system_err_t input_system_configuration_commit(void)
{
        // The last configuration step is to configure the input buffer.
        input_system_err_t error = input_buffer_configuration();

        if (error != INPUT_SYSTEM_ERR_NO_ERROR) {
                return error;
        }

        // Translate the whole configuration into registers.
        error = configuration_to_registers();
        if (error != INPUT_SYSTEM_ERR_NO_ERROR) {
                return error;
        }

        // Translate the whole configuration into ctrl commands etc.

        return INPUT_SYSTEM_ERR_NO_ERROR;
}

// FIFO

input_system_err_t      input_system_csi_fifo_channel_cfg(
    u32         ch_id,
    input_system_csi_port_t     port,
    backend_channel_cfg_t       backend_ch,
    target_cfg2400_t    target
)
{
        channel_cfg_t channel;

        channel.ch_id   = ch_id;
        channel.backend_ch      = backend_ch;
        channel.source_type = INPUT_SYSTEM_SOURCE_SENSOR;
        //channel.source
        channel.source_cfg.csi_cfg.csi_port                     = port;
        channel.source_cfg.csi_cfg.buffering_mode       = INPUT_SYSTEM_FIFO_CAPTURE;
        channel.source_cfg.csi_cfg.csi_buffer                   = IB_BUFFER_NULL;
        channel.source_cfg.csi_cfg.acquisition_buffer   = IB_BUFFER_NULL;
        channel.source_cfg.csi_cfg.nof_xmem_buffers     = 0;

        channel.target_cfg      = target;
        return input_system_configure_channel(channel);
}

input_system_err_t      input_system_csi_fifo_channel_with_counting_cfg(
    u32                         ch_id,
    u32                         nof_frames,
    input_system_csi_port_t                     port,
    backend_channel_cfg_t                       backend_ch,
    u32                         csi_mem_reg_size,
    u32                         csi_nof_mem_regs,
    target_cfg2400_t                    target
)
{
        channel_cfg_t channel;

        channel.ch_id   = ch_id;
        channel.backend_ch      = backend_ch;
        channel.source_type             = INPUT_SYSTEM_SOURCE_SENSOR;
        //channel.source
        channel.source_cfg.csi_cfg.csi_port                     = port;
        channel.source_cfg.csi_cfg.buffering_mode       =
            INPUT_SYSTEM_FIFO_CAPTURE_WITH_COUNTING;
        channel.source_cfg.csi_cfg.csi_buffer.mem_reg_size              = csi_mem_reg_size;
        channel.source_cfg.csi_cfg.csi_buffer.nof_mem_regs              = csi_nof_mem_regs;
        channel.source_cfg.csi_cfg.csi_buffer.mem_reg_addr              = 0;
        channel.source_cfg.csi_cfg.acquisition_buffer                   = IB_BUFFER_NULL;
        channel.source_cfg.csi_cfg.nof_xmem_buffers     = nof_frames;

        channel.target_cfg      = target;
        return input_system_configure_channel(channel);
}

// SRAM

input_system_err_t      input_system_csi_sram_channel_cfg(
    u32                         ch_id,
    input_system_csi_port_t                     port,
    backend_channel_cfg_t                       backend_ch,
    u32                         csi_mem_reg_size,
    u32                         csi_nof_mem_regs,
    //  uint32_t                                acq_mem_reg_size,
    //  uint32_t                                acq_nof_mem_regs,
    target_cfg2400_t                    target
)
{
        channel_cfg_t channel;

        channel.ch_id   = ch_id;
        channel.backend_ch      = backend_ch;
        channel.source_type             = INPUT_SYSTEM_SOURCE_SENSOR;
        //channel.source
        channel.source_cfg.csi_cfg.csi_port                     = port;
        channel.source_cfg.csi_cfg.buffering_mode       = INPUT_SYSTEM_SRAM_BUFFERING;
        channel.source_cfg.csi_cfg.csi_buffer.mem_reg_size              = csi_mem_reg_size;
        channel.source_cfg.csi_cfg.csi_buffer.nof_mem_regs              = csi_nof_mem_regs;
        channel.source_cfg.csi_cfg.csi_buffer.mem_reg_addr              = 0;
        channel.source_cfg.csi_cfg.acquisition_buffer                   = IB_BUFFER_NULL;
        channel.source_cfg.csi_cfg.nof_xmem_buffers     = 0;

        channel.target_cfg      = target;
        return input_system_configure_channel(channel);
}

//XMEM

// Collects all parameters and puts them in channel_cfg_t.
input_system_err_t      input_system_csi_xmem_channel_cfg(
    u32                         ch_id,
    input_system_csi_port_t                     port,
    backend_channel_cfg_t                       backend_ch,
    u32                         csi_mem_reg_size,
    u32                         csi_nof_mem_regs,
    u32                         acq_mem_reg_size,
    u32                         acq_nof_mem_regs,
    target_cfg2400_t                    target,
    uint32_t                            nof_xmem_buffers
)
{
        channel_cfg_t channel;

        channel.ch_id   = ch_id;
        channel.backend_ch      = backend_ch;
        channel.source_type             = INPUT_SYSTEM_SOURCE_SENSOR;
        //channel.source
        channel.source_cfg.csi_cfg.csi_port                     = port;
        channel.source_cfg.csi_cfg.buffering_mode       = INPUT_SYSTEM_XMEM_BUFFERING;
        channel.source_cfg.csi_cfg.csi_buffer.mem_reg_size              = csi_mem_reg_size;
        channel.source_cfg.csi_cfg.csi_buffer.nof_mem_regs              = csi_nof_mem_regs;
        channel.source_cfg.csi_cfg.csi_buffer.mem_reg_addr              = 0;
        channel.source_cfg.csi_cfg.acquisition_buffer.mem_reg_size      = acq_mem_reg_size;
        channel.source_cfg.csi_cfg.acquisition_buffer.nof_mem_regs      = acq_nof_mem_regs;
        channel.source_cfg.csi_cfg.acquisition_buffer.mem_reg_addr      = 0;
        channel.source_cfg.csi_cfg.nof_xmem_buffers     = nof_xmem_buffers;

        channel.target_cfg      = target;
        return input_system_configure_channel(channel);
}

input_system_err_t      input_system_csi_xmem_acquire_only_channel_cfg(
    u32                         ch_id,
    u32                         nof_frames,
    input_system_csi_port_t                     port,
    backend_channel_cfg_t                       backend_ch,
    u32                         acq_mem_reg_size,
    u32                         acq_nof_mem_regs,
    target_cfg2400_t                    target)
{
        channel_cfg_t channel;

        channel.ch_id   = ch_id;
        channel.backend_ch      = backend_ch;
        channel.source_type             = INPUT_SYSTEM_SOURCE_SENSOR;
        //channel.source
        channel.source_cfg.csi_cfg.csi_port                     = port;
        channel.source_cfg.csi_cfg.buffering_mode       = INPUT_SYSTEM_XMEM_ACQUIRE;
        channel.source_cfg.csi_cfg.csi_buffer           = IB_BUFFER_NULL;
        channel.source_cfg.csi_cfg.acquisition_buffer.mem_reg_size      = acq_mem_reg_size;
        channel.source_cfg.csi_cfg.acquisition_buffer.nof_mem_regs      = acq_nof_mem_regs;
        channel.source_cfg.csi_cfg.acquisition_buffer.mem_reg_addr      = 0;
        channel.source_cfg.csi_cfg.nof_xmem_buffers     = nof_frames;

        channel.target_cfg      = target;
        return input_system_configure_channel(channel);
}

input_system_err_t      input_system_csi_xmem_capture_only_channel_cfg(
    u32                         ch_id,
    u32                         nof_frames,
    input_system_csi_port_t                     port,
    u32                         csi_mem_reg_size,
    u32                         csi_nof_mem_regs,
    u32                         acq_mem_reg_size,
    u32                         acq_nof_mem_regs,
    target_cfg2400_t                    target)
{
        channel_cfg_t channel;

        channel.ch_id   = ch_id;
        //channel.backend_ch    = backend_ch;
        channel.source_type             = INPUT_SYSTEM_SOURCE_SENSOR;
        //channel.source
        channel.source_cfg.csi_cfg.csi_port                     = port;
        //channel.source_cfg.csi_cfg.backend_ch         = backend_ch;
        channel.source_cfg.csi_cfg.buffering_mode       = INPUT_SYSTEM_XMEM_CAPTURE;
        channel.source_cfg.csi_cfg.csi_buffer.mem_reg_size              = csi_mem_reg_size;
        channel.source_cfg.csi_cfg.csi_buffer.nof_mem_regs              = csi_nof_mem_regs;
        channel.source_cfg.csi_cfg.csi_buffer.mem_reg_addr              = 0;
        channel.source_cfg.csi_cfg.acquisition_buffer.mem_reg_size      = acq_mem_reg_size;
        channel.source_cfg.csi_cfg.acquisition_buffer.nof_mem_regs      = acq_nof_mem_regs;
        channel.source_cfg.csi_cfg.acquisition_buffer.mem_reg_addr      = 0;
        channel.source_cfg.csi_cfg.nof_xmem_buffers     = nof_frames;

        channel.target_cfg      = target;
        return input_system_configure_channel(channel);
}

// Non - CSI

input_system_err_t      input_system_prbs_channel_cfg(
    u32         ch_id,
    u32         nof_frames,//not used yet
    u32         seed,
    u32         sync_gen_width,
    u32         sync_gen_height,
    u32         sync_gen_hblank_cycles,
    u32         sync_gen_vblank_cycles,
    target_cfg2400_t    target
)
{
        channel_cfg_t channel;

        (void)nof_frames;

        channel.ch_id   = ch_id;
        channel.source_type = INPUT_SYSTEM_SOURCE_PRBS;

        channel.source_cfg.prbs_cfg.seed = seed;
        channel.source_cfg.prbs_cfg.sync_gen_cfg.width          = sync_gen_width;
        channel.source_cfg.prbs_cfg.sync_gen_cfg.height         = sync_gen_height;
        channel.source_cfg.prbs_cfg.sync_gen_cfg.hblank_cycles  = sync_gen_hblank_cycles;
        channel.source_cfg.prbs_cfg.sync_gen_cfg.vblank_cycles  = sync_gen_vblank_cycles;

        channel.target_cfg      = target;

        return input_system_configure_channel(channel);
}

// MW: Don't use system specific names, (even in system specific files) "cfg2400" -> cfg
input_system_err_t      input_system_gpfifo_channel_cfg(
    u32         ch_id,
    u32         nof_frames, //not used yet

    target_cfg2400_t    target)
{
        channel_cfg_t channel;

        (void)nof_frames;

        channel.ch_id   = ch_id;
        channel.source_type     = INPUT_SYSTEM_SOURCE_FIFO;

        channel.target_cfg      = target;
        return input_system_configure_channel(channel);
}

///////////////////////////////////////////////////////////////////////////
//
// Private specialized functions for channel setting.
//
///////////////////////////////////////////////////////////////////////////

// Fills the parameters to config.csi_value[port]
static input_system_err_t input_system_configure_channel_sensor(
    const channel_cfg_t channel)
{
        const u32 port = channel.source_cfg.csi_cfg.csi_port;
        input_system_err_t status = INPUT_SYSTEM_ERR_NO_ERROR;

        input_system_multiplex_t mux;

        if (port >= N_INPUT_SYSTEM_PORTS)
                return INPUT_SYSTEM_ERR_GENERIC;

        //check if port > N_INPUT_SYSTEM_MULTIPLEX

        status = set_source_type(&config.source_type, channel.source_type,
                                 &config.source_type_flags);
        if (status != INPUT_SYSTEM_ERR_NO_ERROR) return status;

        // Check for conflicts on source (implicitly on multicast, capture unit and input buffer).

        status = set_csi_cfg(&config.csi_value[port], &channel.source_cfg.csi_cfg,
                             &config.csi_flags[port]);
        if (status != INPUT_SYSTEM_ERR_NO_ERROR) return status;

        switch (channel.source_cfg.csi_cfg.buffering_mode) {
        case INPUT_SYSTEM_FIFO_CAPTURE:

                // Check for conflicts on mux.
                mux = INPUT_SYSTEM_MIPI_PORT0 + port;
                status = input_system_multiplexer_cfg(&config.multiplexer, mux,
                                                      &config.multiplexer_flags);
                if (status != INPUT_SYSTEM_ERR_NO_ERROR) return status;
                config.multicast[port] = INPUT_SYSTEM_CSI_BACKEND;

                // Shared resource, so it should be blocked.
                //config.mux_flags |= INPUT_SYSTEM_CFG_FLAG_BLOCKED;
                //config.csi_buffer_flags[port] |= INPUT_SYSTEM_CFG_FLAG_BLOCKED;
                //config.acquisition_buffer_unique_flags |= INPUT_SYSTEM_CFG_FLAG_BLOCKED;

                break;
        case INPUT_SYSTEM_SRAM_BUFFERING:

                // Check for conflicts on mux.
                mux = INPUT_SYSTEM_ACQUISITION_UNIT;
                status = input_system_multiplexer_cfg(&config.multiplexer, mux,
                                                      &config.multiplexer_flags);
                if (status != INPUT_SYSTEM_ERR_NO_ERROR) return status;
                config.multicast[port] = INPUT_SYSTEM_INPUT_BUFFER;

                // Shared resource, so it should be blocked.
                //config.mux_flags |= INPUT_SYSTEM_CFG_FLAG_BLOCKED;
                //config.csi_buffer_flags[port] |= INPUT_SYSTEM_CFG_FLAG_BLOCKED;
                //config.acquisition_buffer_unique_flags |= INPUT_SYSTEM_CFG_FLAG_BLOCKED;

                break;
        case INPUT_SYSTEM_XMEM_BUFFERING:

                // Check for conflicts on mux.
                mux = INPUT_SYSTEM_ACQUISITION_UNIT;
                status = input_system_multiplexer_cfg(&config.multiplexer, mux,
                                                      &config.multiplexer_flags);
                if (status != INPUT_SYSTEM_ERR_NO_ERROR) return status;
                config.multicast[port] = INPUT_SYSTEM_INPUT_BUFFER;

                // Shared resource, so it should be blocked.
                //config.mux_flags |= INPUT_SYSTEM_CFG_FLAG_BLOCKED;
                //config.csi_buffer_flags[port] |= INPUT_SYSTEM_CFG_FLAG_BLOCKED;
                //config.acquisition_buffer_unique_flags |= INPUT_SYSTEM_CFG_FLAG_BLOCKED;

                break;
        case INPUT_SYSTEM_FIFO_CAPTURE_WITH_COUNTING:
        case INPUT_SYSTEM_XMEM_CAPTURE:
        case INPUT_SYSTEM_XMEM_ACQUIRE:
        default:
                return INPUT_SYSTEM_ERR_PARAMETER_NOT_SUPPORTED;
        }

        return INPUT_SYSTEM_ERR_NO_ERROR;
}

// Test flags and set structure.
static input_system_err_t set_source_type(
    input_system_source_t *const lhs,
    const input_system_source_t                 rhs,
    input_system_config_flags_t *const flags)
{
        // MW: Not enough asserts
        assert(lhs);
        assert(flags);

        if ((*flags) & INPUT_SYSTEM_CFG_FLAG_BLOCKED) {
                *flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
        }

        if ((*flags) & INPUT_SYSTEM_CFG_FLAG_SET) {
                // Check for consistency with already set value.
                if ((*lhs) == (rhs)) {
                        return INPUT_SYSTEM_ERR_NO_ERROR;
                } else {
                        *flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                        return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
                }
        }
        // Check the value (individually).
        if (rhs >= N_INPUT_SYSTEM_SOURCE) {
                *flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
        }
        // Set the value.
        *lhs = rhs;

        *flags |= INPUT_SYSTEM_CFG_FLAG_SET;
        return INPUT_SYSTEM_ERR_NO_ERROR;
}

// Test flags and set structure.
static input_system_err_t set_csi_cfg(
    csi_cfg_t *const lhs,
    const csi_cfg_t *const rhs,
    input_system_config_flags_t *const flags)
{
        u32 memory_required;
        u32 acq_memory_required;

        assert(lhs);
        assert(flags);

        if ((*flags) & INPUT_SYSTEM_CFG_FLAG_BLOCKED) {
                *flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
        }

        if (*flags & INPUT_SYSTEM_CFG_FLAG_SET) {
                // check for consistency with already set value.
                if (/*lhs->backend_ch == rhs.backend_ch
                        &&*/ lhs->buffering_mode == rhs->buffering_mode
                    && lhs->csi_buffer.mem_reg_size == rhs->csi_buffer.mem_reg_size
                    && lhs->csi_buffer.nof_mem_regs  == rhs->csi_buffer.nof_mem_regs
                    && lhs->acquisition_buffer.mem_reg_size == rhs->acquisition_buffer.mem_reg_size
                    && lhs->acquisition_buffer.nof_mem_regs  == rhs->acquisition_buffer.nof_mem_regs
                    && lhs->nof_xmem_buffers  == rhs->nof_xmem_buffers
                ) {
                        return INPUT_SYSTEM_ERR_NO_ERROR;
                } else {
                        *flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                        return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
                }
        }
        // Check the value (individually).
        // no check for backend_ch
        // no check for nof_xmem_buffers
        memory_required = rhs->csi_buffer.mem_reg_size * rhs->csi_buffer.nof_mem_regs;
        acq_memory_required = rhs->acquisition_buffer.mem_reg_size *
                              rhs->acquisition_buffer.nof_mem_regs;
        if (rhs->buffering_mode >= N_INPUT_SYSTEM_BUFFERING_MODE
            ||
            // Check if required memory is available in input buffer (SRAM).
            (memory_required + acq_memory_required) > config.unallocated_ib_mem_words

           ) {
                *flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
        }
        // Set the value.
        //lhs[port]->backend_ch         = rhs.backend_ch;
        lhs->buffering_mode     = rhs->buffering_mode;
        lhs->nof_xmem_buffers = rhs->nof_xmem_buffers;

        lhs->csi_buffer.mem_reg_size = rhs->csi_buffer.mem_reg_size;
        lhs->csi_buffer.nof_mem_regs  = rhs->csi_buffer.nof_mem_regs;
        lhs->acquisition_buffer.mem_reg_size = rhs->acquisition_buffer.mem_reg_size;
        lhs->acquisition_buffer.nof_mem_regs  = rhs->acquisition_buffer.nof_mem_regs;
        // ALX: NB: Here we just set buffer parameters, but still not allocate it
        // (no addresses determined). That will be done during commit.

        //  FIXIT:      acq_memory_required is not deducted, since it can be allocated multiple times.
        config.unallocated_ib_mem_words -= memory_required;
//assert(config.unallocated_ib_mem_words >=0);
        *flags |= INPUT_SYSTEM_CFG_FLAG_SET;
        return INPUT_SYSTEM_ERR_NO_ERROR;
}

// Test flags and set structure.
static input_system_err_t input_system_multiplexer_cfg(
    input_system_multiplex_t *const lhs,
    const input_system_multiplex_t              rhs,
    input_system_config_flags_t *const flags)
{
        assert(lhs);
        assert(flags);

        if ((*flags) & INPUT_SYSTEM_CFG_FLAG_BLOCKED) {
                *flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
        }

        if ((*flags) & INPUT_SYSTEM_CFG_FLAG_SET) {
                // Check for consistency with already set value.
                if ((*lhs) == (rhs)) {
                        return INPUT_SYSTEM_ERR_NO_ERROR;
                } else {
                        *flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                        return INPUT_SYSTEM_ERR_CONFLICT_ON_RESOURCE;
                }
        }
        // Check the value (individually).
        if (rhs >= N_INPUT_SYSTEM_MULTIPLEX) {
                *flags |= INPUT_SYSTEM_CFG_FLAG_CONFLICT;
                return INPUT_SYSTEM_ERR_PARAMETER_NOT_SUPPORTED;
        }
        // Set the value.
        *lhs = rhs;

        *flags |= INPUT_SYSTEM_CFG_FLAG_SET;
        return INPUT_SYSTEM_ERR_NO_ERROR;
}