drivers/bluetooth/btfm_slim_wcn3990.c

/* Copyright (c) 2016, The Linux Foundation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 and
 * only version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/slimbus/slimbus.h>
#include <btfm_slim.h>
#include <btfm_slim_wcn3990.h>

/* WCN3990 Port assignment */
struct btfmslim_ch wcn3990_rxport[] = {
	{.id = BTFM_BT_SCO_SLIM_RX, .name = "SCO_Rx",
	.port = CHRK_SB_PGD_PORT_RX_SCO},
	{.id = BTFM_BT_SPLIT_A2DP_SLIM_RX, .name = "A2P_Rx",
	.port = CHRK_SB_PGD_PORT_RX_A2P},
	{.id = BTFM_SLIM_NUM_CODEC_DAIS, .name = "",
	.port = BTFM_SLIM_PGD_PORT_LAST},
};

struct btfmslim_ch wcn3990_txport[] = {
	{.id = BTFM_FM_SLIM_TX, .name = "FM_Tx1",
	.port = CHRK_SB_PGD_PORT_TX1_FM},
	{.id = BTFM_FM_SLIM_TX, .name = "FM_Tx2",
	.port = CHRK_SB_PGD_PORT_TX2_FM},
	{.id = BTFM_BT_SCO_SLIM_TX, .name = "SCO_Tx",
	.port = CHRK_SB_PGD_PORT_TX_SCO},
	{.id = BTFM_SLIM_NUM_CODEC_DAIS, .name = "",
	.port = BTFM_SLIM_PGD_PORT_LAST},
};

/* Function description */
int btfm_slim_chrk_hw_init(struct btfmslim *btfmslim)
{
	int ret = 0;
	uint8_t reg_val;

	BTFMSLIM_DBG("");

	if (!btfmslim)
		return -EINVAL;

	/* Get SB_SLAVE_HW_REV_MSB value*/
	ret = btfm_slim_read(btfmslim , CHRK_SB_SLAVE_HW_REV_MSB,  1,
		&reg_val, IFD);
	if (ret) {
		BTFMSLIM_ERR("failed to read (%d)", ret);
		goto error;
	}
	BTFMSLIM_DBG("Major Rev: 0x%x, Minor Rev: 0x%x",
		(reg_val & 0xF0) >> 4, (reg_val & 0x0F));

	/* Get SB_SLAVE_HW_REV_LSB value*/
	ret = btfm_slim_read(btfmslim , CHRK_SB_SLAVE_HW_REV_LSB,  1,
		&reg_val, IFD);
	if (ret) {
		BTFMSLIM_ERR("failed to read (%d)", ret);
		goto error;
	}
	BTFMSLIM_DBG("Step Rev: 0x%x", reg_val);

error:
	return ret;
}


int btfm_slim_chrk_enable_port(struct btfmslim *btfmslim, uint8_t port_num,
	uint8_t rxport, uint8_t enable)
{
	int ret = 0;
	uint8_t reg_val = 0;
	uint16_t reg;

	BTFMSLIM_DBG("enable(%d)", enable);
	if (rxport) {
		/* Port enable */
		reg = CHRK_SB_PGD_PORT_RX_CFGN(port_num - 0x10);
	} else { /* txport */
		/* Multiple Channel Setting - only FM Tx will be multiple
		channel */
		if (enable && (port_num == CHRK_SB_PGD_PORT_TX1_FM ||
			port_num == CHRK_SB_PGD_PORT_TX2_FM)) {

			reg_val = (0x1 << CHRK_SB_PGD_PORT_TX1_FM) |
				(0x1 << CHRK_SB_PGD_PORT_TX2_FM);
			reg = CHRK_SB_PGD_TX_PORTn_MULTI_CHNL_0(port_num);
			ret = btfm_slim_write(btfmslim, reg, 1, &reg_val, IFD);
			if (ret) {
				BTFMSLIM_ERR("failed to write (%d)", ret);
				goto error;
			}
		}

		/* Enable Tx port hw auto recovery for underrun or
		overrun error */
		reg_val = (enable) ? (CHRK_ENABLE_OVERRUN_AUTO_RECOVERY |
				CHRK_ENABLE_UNDERRUN_AUTO_RECOVERY) : 0x0;

		ret = btfm_slim_write(btfmslim,
			CHRK_SB_PGD_PORT_TX_OR_UR_CFGN(port_num), 1,
			&reg_val, IFD);
		if (ret) {
			BTFMSLIM_ERR("failed to write (%d)", ret);
			goto error;
		}

		/* Port enable */
		reg = CHRK_SB_PGD_PORT_TX_CFGN(port_num);
	}

	if (enable)
		/* Set water mark to 1 and enable the port */
		reg_val = CHRK_SB_PGD_PORT_ENABLE | CHRK_SB_PGD_PORT_WM_LB;
	else
		reg_val = CHRK_SB_PGD_PORT_DISABLE;

	ret = btfm_slim_write(btfmslim , reg, 1, &reg_val, IFD);
	if (ret)
		BTFMSLIM_ERR("failed to write (%d)", ret);

error:
	return ret;
}