/*
 * ff-protocol-ff400.c - a part of driver for RME Fireface series
 *
 * Copyright (c) 2015-2017 Takashi Sakamoto
 *
 * Licensed under the terms of the GNU General Public License, version 2.
 */

#include <linux/delay.h>
#include "ff.h"

#define FF400_STF		0x000080100500ull
#define FF400_RX_PACKET_FORMAT	0x000080100504ull
#define FF400_ISOC_COMM_START	0x000080100508ull
#define FF400_TX_PACKET_FORMAT	0x00008010050cull
#define FF400_ISOC_COMM_STOP	0x000080100510ull
#define FF400_SYNC_STATUS	0x0000801c0000ull
#define FF400_FETCH_PCM_FRAMES	0x0000801c0000ull	/* For block request. */
#define FF400_CLOCK_CONFIG	0x0000801c0004ull

#define FF400_MIDI_HIGH_ADDR	0x0000801003f4ull
#define FF400_MIDI_RX_PORT_0	0x000080180000ull
#define FF400_MIDI_RX_PORT_1	0x000080190000ull

static int ff400_get_clock(struct snd_ff *ff, unsigned int *rate,
			   enum snd_ff_clock_src *src)
{
	__le32 reg;
	u32 data;
	int err;

	err = snd_fw_transaction(ff->unit, TCODE_READ_QUADLET_REQUEST,
				 FF400_CLOCK_CONFIG, &reg, sizeof(reg), 0);
	if (err < 0)
		return err;
	data = le32_to_cpu(reg);

	/* Calculate sampling rate. */
	switch ((data >> 1) & 0x03) {
	case 0x01:
		*rate = 32000;
		break;
	case 0x00:
		*rate = 44100;
		break;
	case 0x03:
		*rate = 48000;
		break;
	case 0x02:
	default:
		return -EIO;
	}

	if (data & 0x08)
		*rate *= 2;
	else if (data & 0x10)
		*rate *= 4;

	/* Calculate source of clock. */
	if (data & 0x01) {
		*src = SND_FF_CLOCK_SRC_INTERNAL;
	} else {
		/* TODO: 0x00, 0x01, 0x02, 0x06, 0x07? */
		switch ((data >> 10) & 0x07) {
		case 0x03:
			*src = SND_FF_CLOCK_SRC_SPDIF;
			break;
		case 0x04:
			*src = SND_FF_CLOCK_SRC_WORD;
			break;
		case 0x05:
			*src = SND_FF_CLOCK_SRC_LTC;
			break;
		case 0x00:
		default:
			*src = SND_FF_CLOCK_SRC_ADAT;
			break;
		}
	}

	return 0;
}

static int ff400_begin_session(struct snd_ff *ff, unsigned int rate)
{
	__le32 reg;
	int i, err;

	/* Check whether the given value is supported or not. */
	for (i = 0; i < CIP_SFC_COUNT; i++) {
		if (amdtp_rate_table[i] == rate)
			break;
	}
	if (i == CIP_SFC_COUNT)
		return -EINVAL;

	/* Set the number of data blocks transferred in a second. */
	reg = cpu_to_le32(rate);
	err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
				 FF400_STF, &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	msleep(100);

	/*
	 * Set isochronous channel and the number of quadlets of received
	 * packets.
	 */
	reg = cpu_to_le32(((ff->rx_stream.data_block_quadlets << 3) << 8) |
			  ff->rx_resources.channel);
	err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
				 FF400_RX_PACKET_FORMAT, &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	/*
	 * Set isochronous channel and the number of quadlets of transmitted
	 * packet.
	 */
	/* TODO: investigate the purpose of this 0x80. */
	reg = cpu_to_le32((0x80 << 24) |
			  (ff->tx_resources.channel << 5) |
			  (ff->tx_stream.data_block_quadlets));
	err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
				 FF400_TX_PACKET_FORMAT, &reg, sizeof(reg), 0);
	if (err < 0)
		return err;

	/* Allow to transmit packets. */
	reg = cpu_to_le32(0x00000001);
	return snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
				 FF400_ISOC_COMM_START, &reg, sizeof(reg), 0);
}

static void ff400_finish_session(struct snd_ff *ff)
{
	__le32 reg;

	reg = cpu_to_le32(0x80000000);
	snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
			   FF400_ISOC_COMM_STOP, &reg, sizeof(reg), 0);
}

static int ff400_switch_fetching_mode(struct snd_ff *ff, bool enable)
{
	__le32 *reg;
	int i;
	int err;

	reg = kzalloc(sizeof(__le32) * 18, GFP_KERNEL);
	if (reg == NULL)
		return -ENOMEM;

	if (!enable) {
		/*
		 * Each quadlet is corresponding to data channels in a data
		 * blocks in reverse order. Precisely, quadlets for available
		 * data channels should be enabled. Here, I take second best
		 * to fetch PCM frames from all of data channels regardless of
		 * stf.
		 */
		for (i = 0; i < 18; ++i)
			reg[i] = cpu_to_le32(0x00000001);
	}

	err = snd_fw_transaction(ff->unit, TCODE_WRITE_BLOCK_REQUEST,
				 FF400_FETCH_PCM_FRAMES, reg,
				 sizeof(__le32) * 18, 0);
	kfree(reg);
	return err;
}

static void ff400_dump_sync_status(struct snd_ff *ff,
				   struct snd_info_buffer *buffer)
{
	__le32 reg;
	u32 data;
	int err;

	err = snd_fw_transaction(ff->unit, TCODE_READ_QUADLET_REQUEST,
				 FF400_SYNC_STATUS, &reg, sizeof(reg), 0);
	if (err < 0)
		return;

	data = le32_to_cpu(reg);

	snd_iprintf(buffer, "External source detection:\n");

	snd_iprintf(buffer, "Word Clock:");
	if ((data >> 24) & 0x20) {
		if ((data >> 24) & 0x40)
			snd_iprintf(buffer, "sync\n");
		else
			snd_iprintf(buffer, "lock\n");
	} else {
		snd_iprintf(buffer, "none\n");
	}

	snd_iprintf(buffer, "S/PDIF:");
	if ((data >> 16) & 0x10) {
		if ((data >> 16) & 0x04)
			snd_iprintf(buffer, "sync\n");
		else
			snd_iprintf(buffer, "lock\n");
	} else {
		snd_iprintf(buffer, "none\n");
	}

	snd_iprintf(buffer, "ADAT:");
	if ((data >> 8) & 0x04) {
		if ((data >> 8) & 0x10)
			snd_iprintf(buffer, "sync\n");
		else
			snd_iprintf(buffer, "lock\n");
	} else {
		snd_iprintf(buffer, "none\n");
	}

	snd_iprintf(buffer, "\nUsed external source:\n");

	if (((data >> 22) & 0x07) == 0x07) {
		snd_iprintf(buffer, "None\n");
	} else {
		switch ((data >> 22) & 0x07) {
		case 0x00:
			snd_iprintf(buffer, "ADAT:");
			break;
		case 0x03:
			snd_iprintf(buffer, "S/PDIF:");
			break;
		case 0x04:
			snd_iprintf(buffer, "Word:");
			break;
		case 0x07:
			snd_iprintf(buffer, "Nothing:");
			break;
		case 0x01:
		case 0x02:
		case 0x05:
		case 0x06:
		default:
			snd_iprintf(buffer, "unknown:");
			break;
		}

		if ((data >> 25) & 0x07) {
			switch ((data >> 25) & 0x07) {
			case 0x01:
				snd_iprintf(buffer, "32000\n");
				break;
			case 0x02:
				snd_iprintf(buffer, "44100\n");
				break;
			case 0x03:
				snd_iprintf(buffer, "48000\n");
				break;
			case 0x04:
				snd_iprintf(buffer, "64000\n");
				break;
			case 0x05:
				snd_iprintf(buffer, "88200\n");
				break;
			case 0x06:
				snd_iprintf(buffer, "96000\n");
				break;
			case 0x07:
				snd_iprintf(buffer, "128000\n");
				break;
			case 0x08:
				snd_iprintf(buffer, "176400\n");
				break;
			case 0x09:
				snd_iprintf(buffer, "192000\n");
				break;
			case 0x00:
				snd_iprintf(buffer, "unknown\n");
				break;
			}
		}
	}

	snd_iprintf(buffer, "Multiplied:");
	snd_iprintf(buffer, "%d\n", (data & 0x3ff) * 250);
}

static void ff400_dump_clock_config(struct snd_ff *ff,
				    struct snd_info_buffer *buffer)
{
	__le32 reg;
	u32 data;
	unsigned int rate;
	const char *src;
	int err;

	err = snd_fw_transaction(ff->unit, TCODE_READ_BLOCK_REQUEST,
				 FF400_CLOCK_CONFIG, &reg, sizeof(reg), 0);
	if (err < 0)
		return;

	data = le32_to_cpu(reg);

	snd_iprintf(buffer, "Output S/PDIF format: %s (Emphasis: %s)\n",
		    (data & 0x20) ? "Professional" : "Consumer",
		    (data & 0x40) ? "on" : "off");

	snd_iprintf(buffer, "Optical output interface format: %s\n",
		    ((data >> 8) & 0x01) ? "S/PDIF" : "ADAT");

	snd_iprintf(buffer, "Word output single speed: %s\n",
		    ((data >> 8) & 0x20) ? "on" : "off");

	snd_iprintf(buffer, "S/PDIF input interface: %s\n",
		    ((data >> 8) & 0x02) ? "Optical" : "Coaxial");

	switch ((data >> 1) & 0x03) {
	case 0x01:
		rate = 32000;
		break;
	case 0x00:
		rate = 44100;
		break;
	case 0x03:
		rate = 48000;
		break;
	case 0x02:
	default:
		return;
	}

	if (data & 0x08)
		rate *= 2;
	else if (data & 0x10)
		rate *= 4;

	snd_iprintf(buffer, "Sampling rate: %d\n", rate);

	if (data & 0x01) {
		src = "Internal";
	} else {
		switch ((data >> 10) & 0x07) {
		case 0x00:
			src = "ADAT";
			break;
		case 0x03:
			src = "S/PDIF";
			break;
		case 0x04:
			src = "Word";
			break;
		case 0x05:
			src = "LTC";
			break;
		default:
			return;
		}
	}

	snd_iprintf(buffer, "Sync to clock source: %s\n", src);
}

const struct snd_ff_protocol snd_ff_protocol_ff400 = {
	.get_clock		= ff400_get_clock,
	.begin_session		= ff400_begin_session,
	.finish_session		= ff400_finish_session,
	.switch_fetching_mode	= ff400_switch_fetching_mode,

	.dump_sync_status	= ff400_dump_sync_status,
	.dump_clock_config	= ff400_dump_clock_config,

	.midi_high_addr_reg	= FF400_MIDI_HIGH_ADDR,
	.midi_rx_port_0_reg	= FF400_MIDI_RX_PORT_0,
	.midi_rx_port_1_reg	= FF400_MIDI_RX_PORT_1,
};