drivers/misc/ihs_fpga.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2017
 * Mario Six,  Guntermann & Drunck GmbH, mario.six@gdsys.cc
 *
 * based on the ioep-fpga driver, which is
 *
 * (C) Copyright 2014
 * Dirk Eibach,  Guntermann & Drunck GmbH, eibach@gdsys.de
 */

#include <common.h>
#include <dm.h>
#include <log.h>
#include <regmap.h>
#include <asm/gpio.h>
#include <linux/delay.h>

#include "ihs_fpga.h"

/**
 * struct ihs_fpga_priv - Private data structure for IHS FPGA driver
 * @map:        Register map for the FPGA's own register space
 * @reset_gpio: GPIO to start FPGA reconfiguration
 * @done_gpio:  GPOI to read the 'ready' status of the FPGA
 */
struct ihs_fpga_priv {
	struct regmap *map;
	struct gpio_desc reset_gpio;
	struct gpio_desc done_gpio;
};

/* Test pattern for reflection test */
const u16 REFLECTION_TESTPATTERN = 0xdead;
/* Delay (in ms) for each round in the reflection test */
const uint REFLECTION_TEST_DELAY = 100;
/* Maximum number of rounds in the reflection test */
const uint REFLECTION_TEST_ROUNDS = 5;
/* Delay (in ms) for each round waiting for the FPGA's done GPIO */
const uint FPGA_DONE_WAIT_DELAY = 100;
/* Maximum number of rounds for waiting for the FPGA's done GPIO */
const uint FPGA_DONE_WAIT_ROUND = 5;

/**
 * enum pcb_video_type - Video type of the PCB
 * @PCB_DVI_SL:     Video type is DVI single-link
 * @PCB_DP_165MPIX: Video type is DisplayPort (165Mpix)
 * @PCB_DP_300MPIX: Video type is DisplayPort (300Mpix)
 * @PCB_HDMI:       Video type is HDMI
 * @PCB_DP_1_2:     Video type is DisplayPort 1.2
 * @PCB_HDMI_2_0:   Video type is HDMI 2.0
 */
enum pcb_video_type {
	PCB_DVI_SL,
	PCB_DP_165MPIX,
	PCB_DP_300MPIX,
	PCB_HDMI,
	PCB_DP_1_2,
	PCB_HDMI_2_0,
};

/**
 * enum pcb_transmission_type - Transmission type of the PCB
 * @PCB_CAT_1G:    Transmission type is 1G Ethernet
 * @PCB_FIBER_3G:  Transmission type is 3G Fiber
 * @PCB_CAT_10G:   Transmission type is 10G Ethernet
 * @PCB_FIBER_10G: Transmission type is 10G Fiber
 */
enum pcb_transmission_type {
	PCB_CAT_1G,
	PCB_FIBER_3G,
	PCB_CAT_10G,
	PCB_FIBER_10G,
};

/**
 * enum carrier_speed - Speed of the FPGA's carrier
 * @CARRIER_SPEED_1G:   The carrier speed is 1G
 * @CARRIER_SPEED_2_5G: The carrier speed is 2.5G
 * @CARRIER_SPEED_3G:   The carrier speed is 3G
 * @CARRIER_SPEED_10G:  The carrier speed is 10G
 */
enum carrier_speed {
	CARRIER_SPEED_1G,
	CARRIER_SPEED_3G,
	CARRIER_SPEED_2_5G = CARRIER_SPEED_3G,
	CARRIER_SPEED_10G,
};

/**
 * enum ram_config - FPGA's RAM configuration
 * @RAM_DDR2_32BIT_295MBPS:  DDR2 32 bit at 295Mb/s
 * @RAM_DDR3_32BIT_590MBPS:  DDR3 32 bit at 590Mb/s
 * @RAM_DDR3_48BIT_590MBPS:  DDR3 48 bit at 590Mb/s
 * @RAM_DDR3_64BIT_1800MBPS: DDR3 64 bit at 1800Mb/s
 * @RAM_DDR3_48BIT_1800MBPS: DDR3 48 bit at 1800Mb/s
 */
enum ram_config {
	RAM_DDR2_32BIT_295MBPS,
	RAM_DDR3_32BIT_590MBPS,
	RAM_DDR3_48BIT_590MBPS,
	RAM_DDR3_64BIT_1800MBPS,
	RAM_DDR3_48BIT_1800MBPS,
};

/**
 * enum sysclock - Speed of the FPGA's system clock
 * @SYSCLK_147456: System clock is 147.456 MHz
 */
enum sysclock {
	SYSCLK_147456,
};

/**
 * struct fpga_versions - Data read from the versions register
 * @video_channel:	   Is the FPGA for a video channel (true) or main
 *			   channel (false) device?
 * @con_side:		   Is the FPGA for a CON (true) or a CPU (false) device?
 * @pcb_video_type:	   Defines for whch video type the FPGA is configured
 * @pcb_transmission_type: Defines for which transmission type the FPGA is
 *			   configured
 * @hw_version:		   Hardware version of the FPGA
 */
struct fpga_versions {
	bool video_channel;
	bool con_side;
	enum pcb_video_type pcb_video_type;
	enum pcb_transmission_type pcb_transmission_type;
	unsigned int hw_version;
};

/**
 * struct fpga_features - Data read from the features register
 * @video_channels:	Number of video channels supported
 * @carriers:		Number of carrier channels supported
 * @carrier_speed:	Speed of carriers
 * @ram_config:		RAM configuration of FPGA
 * @sysclock:		System clock speed of FPGA
 * @pcm_tx:		Support for PCM transmission
 * @pcm_rx:		Support for PCM reception
 * @spdif_tx:		Support for SPDIF audio transmission
 * @spdif_rx:		Support for SPDIF audio reception
 * @usb2:		Support for transparent USB2.0
 * @rs232:		Support for bidirectional RS232
 * @compression_type1:	Support for compression type 1
 * @compression_type2:	Support for compression type 2
 * @compression_type3:	Support for compression type 3
 * @interlace:		Support for interlace image formats
 * @osd:		Support for a OSD
 * @compression_pipes:	Number of compression pipes supported
 */
struct fpga_features {
	u8 video_channels;
	u8 carriers;
	enum carrier_speed carrier_speed;
	enum ram_config ram_config;
	enum sysclock sysclock;
	bool pcm_tx;
	bool pcm_rx;
	bool spdif_tx;
	bool spdif_rx;
	bool usb2;
	bool rs232;
	bool compression_type1;
	bool compression_type2;
	bool compression_type3;
	bool interlace;
	bool osd;
	bool compression_pipes;
};

#ifdef CONFIG_SYS_FPGA_FLAVOR_GAZERBEAM

/**
 * get_versions() - Fill structure with info from version register.
 * @dev:      FPGA device to be queried for information
 * @versions: Pointer to the structure to fill with information from the
 *	      versions register
 * Return: 0
 */
static int get_versions(struct udevice *dev, struct fpga_versions *versions)
{
	struct ihs_fpga_priv *priv = dev_get_priv(dev);
	enum {
		VERSIONS_FPGA_VIDEO_CHANNEL = BIT(12),
		VERSIONS_FPGA_CON_SIDE = BIT(13),
		VERSIONS_FPGA_SC = BIT(14),
		VERSIONS_PCB_CON = BIT(9),
		VERSIONS_PCB_SC = BIT(8),
		VERSIONS_PCB_VIDEO_MASK = 0x3 << 6,
		VERSIONS_PCB_VIDEO_DP_1_2 = 0x0 << 6,
		VERSIONS_PCB_VIDEO_HDMI_2_0 = 0x1 << 6,
		VERSIONS_PCB_TRANSMISSION_MASK = 0x3 << 4,
		VERSIONS_PCB_TRANSMISSION_FIBER_10G = 0x0 << 4,
		VERSIONS_PCB_TRANSMISSION_CAT_10G = 0x1 << 4,
		VERSIONS_PCB_TRANSMISSION_FIBER_3G = 0x2 << 4,
		VERSIONS_PCB_TRANSMISSION_CAT_1G = 0x3 << 4,
		VERSIONS_HW_VER_MASK = 0xf << 0,
	};
	u16 raw_versions;

	memset(versions, 0, sizeof(struct fpga_versions));

	ihs_fpga_get(priv->map, versions, &raw_versions);

	versions->video_channel = raw_versions & VERSIONS_FPGA_VIDEO_CHANNEL;
	versions->con_side = raw_versions & VERSIONS_FPGA_CON_SIDE;

	switch (raw_versions & VERSIONS_PCB_VIDEO_MASK) {
	case VERSIONS_PCB_VIDEO_DP_1_2:
		versions->pcb_video_type = PCB_DP_1_2;
		break;

	case VERSIONS_PCB_VIDEO_HDMI_2_0:
		versions->pcb_video_type = PCB_HDMI_2_0;
		break;
	}

	switch (raw_versions & VERSIONS_PCB_TRANSMISSION_MASK) {
	case VERSIONS_PCB_TRANSMISSION_FIBER_10G:
		versions->pcb_transmission_type = PCB_FIBER_10G;
		break;

	case VERSIONS_PCB_TRANSMISSION_CAT_10G:
		versions->pcb_transmission_type = PCB_CAT_10G;
		break;

	case VERSIONS_PCB_TRANSMISSION_FIBER_3G:
		versions->pcb_transmission_type = PCB_FIBER_3G;
		break;

	case VERSIONS_PCB_TRANSMISSION_CAT_1G:
		versions->pcb_transmission_type = PCB_CAT_1G;
		break;
	}

	versions->hw_version = raw_versions & VERSIONS_HW_VER_MASK;

	return 0;
}

/**
 * get_features() - Fill structure with info from features register.
 * @dev:      FPGA device to be queried for information
 * @features: Pointer to the structure to fill with information from the
 *	      features register
 * Return: 0
 */
static int get_features(struct udevice *dev, struct fpga_features *features)
{
	struct ihs_fpga_priv *priv = dev_get_priv(dev);
	enum {
		FEATURE_SPDIF_RX = BIT(15),
		FEATURE_SPDIF_TX = BIT(14),
		FEATURE_PCM_RX = BIT(13),
		FEATURE_PCM_TX = BIT(12),
		FEATURE_RAM_MASK = GENMASK(11, 8),
		FEATURE_RAM_DDR2_32BIT_295MBPS = 0x0 << 8,
		FEATURE_RAM_DDR3_32BIT_590MBPS = 0x1 << 8,
		FEATURE_RAM_DDR3_48BIT_590MBPS = 0x2 << 8,
		FEATURE_RAM_DDR3_64BIT_1800MBPS = 0x3 << 8,
		FEATURE_RAM_DDR3_48BIT_1800MBPS = 0x4 << 8,
		FEATURE_CARRIER_SPEED_MASK = GENMASK(7, 6),
		FEATURE_CARRIER_SPEED_1G = 0x0 << 6,
		FEATURE_CARRIER_SPEED_2_5G = 0x1 << 6,
		FEATURE_CARRIER_SPEED_10G = 0x2 << 6,
		FEATURE_CARRIERS_MASK = GENMASK(5, 4),
		FEATURE_CARRIERS_0 = 0x0 << 4,
		FEATURE_CARRIERS_1 = 0x1 << 4,
		FEATURE_CARRIERS_2 = 0x2 << 4,
		FEATURE_CARRIERS_4 = 0x3 << 4,
		FEATURE_USB2 = BIT(3),
		FEATURE_VIDEOCHANNELS_MASK = GENMASK(2, 0),
		FEATURE_VIDEOCHANNELS_0 = 0x0 << 0,
		FEATURE_VIDEOCHANNELS_1 = 0x1 << 0,
		FEATURE_VIDEOCHANNELS_1_1 = 0x2 << 0,
		FEATURE_VIDEOCHANNELS_2 = 0x3 << 0,
	};

	enum {
		EXT_FEATURE_OSD = BIT(15),
		EXT_FEATURE_ETHERNET = BIT(9),
		EXT_FEATURE_INTERLACE = BIT(8),
		EXT_FEATURE_RS232 = BIT(7),
		EXT_FEATURE_COMPRESSION_PERF_MASK = GENMASK(6, 4),
		EXT_FEATURE_COMPRESSION_PERF_1X = 0x0 << 4,
		EXT_FEATURE_COMPRESSION_PERF_2X = 0x1 << 4,
		EXT_FEATURE_COMPRESSION_PERF_4X = 0x2 << 4,
		EXT_FEATURE_COMPRESSION_TYPE1 = BIT(0),
		EXT_FEATURE_COMPRESSION_TYPE2 = BIT(1),
		EXT_FEATURE_COMPRESSION_TYPE3 = BIT(2),
	};

	u16 raw_features;
	u16 raw_extended_features;

	memset(features, 0, sizeof(struct fpga_features));

	ihs_fpga_get(priv->map, features, &raw_features);
	ihs_fpga_get(priv->map, extended_features, &raw_extended_features);

	switch (raw_features & FEATURE_VIDEOCHANNELS_MASK) {
	case FEATURE_VIDEOCHANNELS_0:
		features->video_channels = 0;
		break;

	case FEATURE_VIDEOCHANNELS_1:
		features->video_channels = 1;
		break;

	case FEATURE_VIDEOCHANNELS_1_1:
	case FEATURE_VIDEOCHANNELS_2:
		features->video_channels = 2;
		break;
	};

	switch (raw_features & FEATURE_CARRIERS_MASK) {
	case FEATURE_CARRIERS_0:
		features->carriers = 0;
		break;

	case FEATURE_CARRIERS_1:
		features->carriers = 1;
		break;

	case FEATURE_CARRIERS_2:
		features->carriers = 2;
		break;

	case FEATURE_CARRIERS_4:
		features->carriers = 4;
		break;
	}

	switch (raw_features & FEATURE_CARRIER_SPEED_MASK) {
	case FEATURE_CARRIER_SPEED_1G:
		features->carrier_speed = CARRIER_SPEED_1G;
		break;
	case FEATURE_CARRIER_SPEED_2_5G:
		features->carrier_speed = CARRIER_SPEED_2_5G;
		break;
	case FEATURE_CARRIER_SPEED_10G:
		features->carrier_speed = CARRIER_SPEED_10G;
		break;
	}

	switch (raw_features & FEATURE_RAM_MASK) {
	case FEATURE_RAM_DDR2_32BIT_295MBPS:
		features->ram_config = RAM_DDR2_32BIT_295MBPS;
		break;

	case FEATURE_RAM_DDR3_32BIT_590MBPS:
		features->ram_config = RAM_DDR3_32BIT_590MBPS;
		break;

	case FEATURE_RAM_DDR3_48BIT_590MBPS:
		features->ram_config = RAM_DDR3_48BIT_590MBPS;
		break;

	case FEATURE_RAM_DDR3_64BIT_1800MBPS:
		features->ram_config = RAM_DDR3_64BIT_1800MBPS;
		break;

	case FEATURE_RAM_DDR3_48BIT_1800MBPS:
		features->ram_config = RAM_DDR3_48BIT_1800MBPS;
		break;
	}

	features->pcm_tx = raw_features & FEATURE_PCM_TX;
	features->pcm_rx = raw_features & FEATURE_PCM_RX;
	features->spdif_tx = raw_features & FEATURE_SPDIF_TX;
	features->spdif_rx = raw_features & FEATURE_SPDIF_RX;
	features->usb2 = raw_features & FEATURE_USB2;
	features->rs232 = raw_extended_features & EXT_FEATURE_RS232;
	features->compression_type1 = raw_extended_features &
					EXT_FEATURE_COMPRESSION_TYPE1;
	features->compression_type2 = raw_extended_features &
					EXT_FEATURE_COMPRESSION_TYPE2;
	features->compression_type3 = raw_extended_features &
					EXT_FEATURE_COMPRESSION_TYPE3;
	features->interlace = raw_extended_features & EXT_FEATURE_INTERLACE;
	features->osd = raw_extended_features & EXT_FEATURE_OSD;
	features->compression_pipes = raw_extended_features &
					EXT_FEATURE_COMPRESSION_PERF_MASK;

	return 0;
}

#else

/**
 * get_versions() - Fill structure with info from version register.
 * @fpga:     Identifier of the FPGA device to be queried for information
 * @versions: Pointer to the structure to fill with information from the
 *	      versions register
 *
 * This is the legacy version and should be considered deprecated for new
 * devices.
 *
 * Return: 0
 */
static int get_versions(unsigned int fpga, struct fpga_versions *versions)
{
	enum {
		/* HW version encoding is a mess, leave it for the moment */
		VERSIONS_HW_VER_MASK = 0xf << 0,
		VERSIONS_PIX_CLOCK_GEN_IDT8N3QV01 = BIT(4),
		VERSIONS_SFP = BIT(5),
		VERSIONS_VIDEO_MASK = 0x7 << 6,
		VERSIONS_VIDEO_DVI = 0x0 << 6,
		VERSIONS_VIDEO_DP_165 = 0x1 << 6,
		VERSIONS_VIDEO_DP_300 = 0x2 << 6,
		VERSIONS_VIDEO_HDMI = 0x3 << 6,
		VERSIONS_UT_MASK = 0xf << 12,
		VERSIONS_UT_MAIN_SERVER = 0x0 << 12,
		VERSIONS_UT_MAIN_USER = 0x1 << 12,
		VERSIONS_UT_VIDEO_SERVER = 0x2 << 12,
		VERSIONS_UT_VIDEO_USER = 0x3 << 12,
	};
	u16 raw_versions;

	memset(versions, 0, sizeof(struct fpga_versions));

	FPGA_GET_REG(fpga, versions, &raw_versions);

	switch (raw_versions & VERSIONS_UT_MASK) {
	case VERSIONS_UT_MAIN_SERVER:
		versions->video_channel = false;
		versions->con_side = false;
		break;

	case VERSIONS_UT_MAIN_USER:
		versions->video_channel = false;
		versions->con_side = true;
		break;

	case VERSIONS_UT_VIDEO_SERVER:
		versions->video_channel = true;
		versions->con_side = false;
		break;

	case VERSIONS_UT_VIDEO_USER:
		versions->video_channel = true;
		versions->con_side = true;
		break;
	}

	switch (raw_versions & VERSIONS_VIDEO_MASK) {
	case VERSIONS_VIDEO_DVI:
		versions->pcb_video_type = PCB_DVI_SL;
		break;

	case VERSIONS_VIDEO_DP_165:
		versions->pcb_video_type = PCB_DP_165MPIX;
		break;

	case VERSIONS_VIDEO_DP_300:
		versions->pcb_video_type = PCB_DP_300MPIX;
		break;

	case VERSIONS_VIDEO_HDMI:
		versions->pcb_video_type = PCB_HDMI;
		break;
	}

	versions->hw_version = raw_versions & VERSIONS_HW_VER_MASK;

	if (raw_versions & VERSIONS_SFP)
		versions->pcb_transmission_type = PCB_FIBER_3G;
	else
		versions->pcb_transmission_type = PCB_CAT_1G;

	return 0;
}

/**
 * get_features() - Fill structure with info from features register.
 * @fpga:     Identifier of the FPGA device to be queried for information
 * @features: Pointer to the structure to fill with information from the
 *	      features register
 *
 * This is the legacy version and should be considered deprecated for new
 * devices.
 *
 * Return: 0
 */
static int get_features(unsigned int fpga, struct fpga_features *features)
{
	enum {
		FEATURE_CARRIER_SPEED_2_5 = BIT(4),
		FEATURE_RAM_MASK = 0x7 << 5,
		FEATURE_RAM_DDR2_32BIT = 0x0 << 5,
		FEATURE_RAM_DDR3_32BIT = 0x1 << 5,
		FEATURE_RAM_DDR3_48BIT = 0x2 << 5,
		FEATURE_PCM_AUDIO_TX = BIT(9),
		FEATURE_PCM_AUDIO_RX = BIT(10),
		FEATURE_OSD = BIT(11),
		FEATURE_USB20 = BIT(12),
		FEATURE_COMPRESSION_MASK = 7 << 13,
		FEATURE_COMPRESSION_TYPE1 = 0x1 << 13,
		FEATURE_COMPRESSION_TYPE1_TYPE2 = 0x3 << 13,
		FEATURE_COMPRESSION_TYPE1_TYPE2_TYPE3 = 0x7 << 13,
	};

	enum {
		EXTENDED_FEATURE_SPDIF_AUDIO_TX = BIT(0),
		EXTENDED_FEATURE_SPDIF_AUDIO_RX = BIT(1),
		EXTENDED_FEATURE_RS232 = BIT(2),
		EXTENDED_FEATURE_COMPRESSION_PIPES = BIT(3),
		EXTENDED_FEATURE_INTERLACE = BIT(4),
	};

	u16 raw_features;
	u16 raw_extended_features;

	memset(features, 0, sizeof(struct fpga_features));

	FPGA_GET_REG(fpga, fpga_features, &raw_features);
	FPGA_GET_REG(fpga, fpga_ext_features, &raw_extended_features);

	features->video_channels = raw_features & 0x3;
	features->carriers = (raw_features >> 2) & 0x3;

	features->carrier_speed = (raw_features & FEATURE_CARRIER_SPEED_2_5)
		? CARRIER_SPEED_2_5G : CARRIER_SPEED_1G;

	switch (raw_features & FEATURE_RAM_MASK) {
	case FEATURE_RAM_DDR2_32BIT:
		features->ram_config = RAM_DDR2_32BIT_295MBPS;
		break;

	case FEATURE_RAM_DDR3_32BIT:
		features->ram_config = RAM_DDR3_32BIT_590MBPS;
		break;

	case FEATURE_RAM_DDR3_48BIT:
		features->ram_config = RAM_DDR3_48BIT_590MBPS;
		break;
	}

	features->pcm_tx = raw_features & FEATURE_PCM_AUDIO_TX;
	features->pcm_rx = raw_features & FEATURE_PCM_AUDIO_RX;
	features->spdif_tx = raw_extended_features &
				EXTENDED_FEATURE_SPDIF_AUDIO_TX;
	features->spdif_rx = raw_extended_features &
				EXTENDED_FEATURE_SPDIF_AUDIO_RX;

	features->usb2 = raw_features & FEATURE_USB20;
	features->rs232 = raw_extended_features & EXTENDED_FEATURE_RS232;

	features->compression_type1 = false;
	features->compression_type2 = false;
	features->compression_type3 = false;
	switch (raw_features & FEATURE_COMPRESSION_MASK) {
	case FEATURE_COMPRESSION_TYPE1_TYPE2_TYPE3:
		features->compression_type3 = true;
		/* fall-through */
	case FEATURE_COMPRESSION_TYPE1_TYPE2:
		features->compression_type2 = true;
		/* fall-through */
	case FEATURE_COMPRESSION_TYPE1:
		features->compression_type1 = true;
		break;
	}

	features->interlace = raw_extended_features &
				EXTENDED_FEATURE_INTERLACE;
	features->osd = raw_features & FEATURE_OSD;
	features->compression_pipes = raw_extended_features &
					EXTENDED_FEATURE_COMPRESSION_PIPES;

	return 0;
}

#endif

/**
 * fpga_print_info() - Print information about FPGA device
 * @dev: FPGA device to print information about
 */
static void fpga_print_info(struct udevice *dev)
{
	struct ihs_fpga_priv *priv = dev_get_priv(dev);
	u16 fpga_version;
	struct fpga_versions versions;
	struct fpga_features features;

	ihs_fpga_get(priv->map, fpga_version, &fpga_version);
	get_versions(dev, &versions);
	get_features(dev, &features);

	if (versions.video_channel)
		printf("Videochannel");
	else
		printf("Mainchannel");

	if (versions.con_side)
		printf(" User");
	else
		printf(" Server");

	switch (versions.pcb_transmission_type) {
	case PCB_CAT_1G:
	case PCB_CAT_10G:
		printf(" CAT");
		break;
	case PCB_FIBER_3G:
	case PCB_FIBER_10G:
		printf(" Fiber");
		break;
	};

	switch (versions.pcb_video_type) {
	case PCB_DVI_SL:
		printf(" DVI,");
		break;
	case PCB_DP_165MPIX:
		printf(" DP 165MPix/s,");
		break;
	case PCB_DP_300MPIX:
		printf(" DP 300MPix/s,");
		break;
	case PCB_HDMI:
		printf(" HDMI,");
		break;
	case PCB_DP_1_2:
		printf(" DP 1.2,");
		break;
	case PCB_HDMI_2_0:
		printf(" HDMI 2.0,");
		break;
	}

	printf(" FPGA V %d.%02d\n       features: ",
	       fpga_version / 100, fpga_version % 100);

	if (!features.compression_type1 &&
	    !features.compression_type2 &&
	    !features.compression_type3)
		printf("no compression, ");

	if (features.compression_type1)
		printf("type1, ");

	if (features.compression_type2)
		printf("type2, ");

	if (features.compression_type3)
		printf("type3, ");

	printf("%sosd", features.osd ? "" : "no ");

	if (features.pcm_rx && features.pcm_tx)
		printf(", pcm rx+tx");
	else if (features.pcm_rx)
		printf(", pcm rx");
	else if (features.pcm_tx)
		printf(", pcm tx");

	if (features.spdif_rx && features.spdif_tx)
		printf(", spdif rx+tx");
	else if (features.spdif_rx)
		printf(", spdif rx");
	else if (features.spdif_tx)
		printf(", spdif tx");

	puts(",\n       ");

	switch (features.sysclock) {
	case SYSCLK_147456:
		printf("clock 147.456 MHz");
		break;
	}

	switch (features.ram_config) {
	case RAM_DDR2_32BIT_295MBPS:
		printf(", RAM 32 bit DDR2");
		break;
	case RAM_DDR3_32BIT_590MBPS:
		printf(", RAM 32 bit DDR3");
		break;
	case RAM_DDR3_48BIT_590MBPS:
	case RAM_DDR3_48BIT_1800MBPS:
		printf(", RAM 48 bit DDR3");
		break;
	case RAM_DDR3_64BIT_1800MBPS:
		printf(", RAM 64 bit DDR3");
		break;
	}

	printf(", %d carrier(s)", features.carriers);

	switch (features.carrier_speed) {
	case CARRIER_SPEED_1G:
		printf(", 1Gbit/s");
		break;
	case CARRIER_SPEED_3G:
		printf(", 3Gbit/s");
		break;
	case CARRIER_SPEED_10G:
		printf(", 10Gbit/s");
		break;
	}

	printf(", %d video channel(s)\n", features.video_channels);
}

/**
 * do_reflection_test() - Run reflection test on a FPGA device
 * @dev: FPGA device to run reflection test on
 *
 * Return: 0 if reflection test succeeded, -ve on error
 */
static int do_reflection_test(struct udevice *dev)
{
	struct ihs_fpga_priv *priv = dev_get_priv(dev);
	int ctr = 0;

	while (1) {
		u16 val;

		ihs_fpga_set(priv->map, reflection_low, REFLECTION_TESTPATTERN);

		ihs_fpga_get(priv->map, reflection_low, &val);
		if (val == (~REFLECTION_TESTPATTERN & 0xffff))
			return -EIO;

		mdelay(REFLECTION_TEST_DELAY);
		if (ctr++ > REFLECTION_TEST_ROUNDS)
			return 0;
	}
}

/**
 * wait_for_fpga_done() - Wait until 'done'-flag is set for FPGA device
 * @dev: FPGA device whose done flag to wait for
 *
 * This function waits until it detects that the done-GPIO's value was changed
 * to 1 by the FPGA, which indicates that the device is configured and ready to
 * use.
 *
 * Return: 0 if done flag was detected, -ve on error
 */
static int wait_for_fpga_done(struct udevice *dev)
{
	struct ihs_fpga_priv *priv = dev_get_priv(dev);
	int ctr = 0;
	int done_val;

	while (1) {
		done_val = dm_gpio_get_value(&priv->done_gpio);
		if (done_val < 0) {
			debug("%s: Error while reading done-GPIO (err = %d)\n",
			      dev->name, done_val);
			return done_val;
		}

		if (done_val)
			return 0;

		mdelay(FPGA_DONE_WAIT_DELAY);
		if (ctr++ > FPGA_DONE_WAIT_ROUND) {
			debug("%s: FPGA init failed (done not detected)\n",
			      dev->name);
			return -EIO;
		}
	}
}

static int ihs_fpga_probe(struct udevice *dev)
{
	struct ihs_fpga_priv *priv = dev_get_priv(dev);
	int ret;

	/* TODO(mario.six@gdsys.cc): Case of FPGA attached to MCLink bus */

	ret = regmap_init_mem(dev_ofnode(dev), &priv->map);
	if (ret) {
		debug("%s: Could not initialize regmap (err = %d)",
		      dev->name, ret);
		return ret;
	}

	ret = gpio_request_by_name(dev, "reset-gpios", 0, &priv->reset_gpio,
				   GPIOD_IS_OUT);
	if (ret) {
		debug("%s: Could not get reset-GPIO (err = %d)\n",
		      dev->name, ret);
		return ret;
	}

	if (!priv->reset_gpio.dev) {
		debug("%s: Could not get reset-GPIO\n", dev->name);
		return -ENOENT;
	}

	ret = gpio_request_by_name(dev, "done-gpios", 0, &priv->done_gpio,
				   GPIOD_IS_IN);
	if (ret) {
		debug("%s: Could not get done-GPIO (err = %d)\n",
		      dev->name, ret);
		return ret;
	}

	if (!priv->done_gpio.dev) {
		debug("%s: Could not get done-GPIO\n", dev->name);
		return -ENOENT;
	}

	ret = dm_gpio_set_value(&priv->reset_gpio, 1);
	if (ret) {
		debug("%s: Error while setting reset-GPIO (err = %d)\n",
		      dev->name, ret);
		return ret;
	}

	/* If FPGA already runs, don't initialize again */
	if (do_reflection_test(dev))
		goto reflection_ok;

	ret = dm_gpio_set_value(&priv->reset_gpio, 0);
	if (ret) {
		debug("%s: Error while setting reset-GPIO (err = %d)\n",
		      dev->name, ret);
		return ret;
	}

	ret = wait_for_fpga_done(dev);
	if (ret) {
		debug("%s: Error while waiting for FPGA done (err = %d)\n",
		      dev->name, ret);
		return ret;
	}

	udelay(10);

	ret = dm_gpio_set_value(&priv->reset_gpio, 1);
	if (ret) {
		debug("%s: Error while setting reset-GPIO (err = %d)\n",
		      dev->name, ret);
		return ret;
	}

	if (!do_reflection_test(dev)) {
		debug("%s: Reflection test FAILED\n", dev->name);
		return -EIO;
	}

reflection_ok:
	printf("%s: Reflection test passed.\n", dev->name);

	fpga_print_info(dev);

	return 0;
}

static const struct udevice_id ihs_fpga_ids[] = {
	{ .compatible = "gdsys,iocon_fpga" },
	{ .compatible = "gdsys,iocpu_fpga" },
	{ }
};

U_BOOT_DRIVER(ihs_fpga_bus) = {
	.name           = "ihs_fpga_bus",
	.id             = UCLASS_MISC,
	.of_match       = ihs_fpga_ids,
	.probe          = ihs_fpga_probe,
	.priv_auto_alloc_size = sizeof(struct ihs_fpga_priv),
};