android_kernel_samsung_sm8650-modules/soc/swr-mstr-ctrl.c

/* Copyright (c) 2015-2018, 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/irq.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/clk.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <soc/soundwire.h>
#include <soc/swr-wcd.h>
#include <linux/regmap.h>
#include "swrm_registers.h"
#include "swr-mstr-ctrl.h"
#include "swrm_port_config.h"


#define SWR_BROADCAST_CMD_ID            0x0F
#define SWR_AUTO_SUSPEND_DELAY          3 /* delay in sec */
#define SWR_DEV_ID_MASK			0xFFFFFFFF
#define SWR_REG_VAL_PACK(data, dev, id, reg)	\
			((reg) | ((id) << 16) | ((dev) << 20) | ((data) << 24))

/* pm runtime auto suspend timer in msecs */
static int auto_suspend_timer = SWR_AUTO_SUSPEND_DELAY * 1000;
module_param(auto_suspend_timer, int, 0664);
MODULE_PARM_DESC(auto_suspend_timer, "timer for auto suspend");

enum {
	SWR_NOT_PRESENT, /* Device is detached/not present on the bus */
	SWR_ATTACHED_OK, /* Device is attached */
	SWR_ALERT,       /* Device alters master for any interrupts */
	SWR_RESERVED,    /* Reserved */
};

enum {
	MASTER_ID_WSA = 1,
	MASTER_ID_RX,
	MASTER_ID_TX
};
#define MASTER_ID_MASK 0xF
#define TRUE 1
#define FALSE 0

#define SWRM_MAX_PORT_REG    40
#define SWRM_MAX_INIT_REG    8

#define SWR_MSTR_MAX_REG_ADDR	0x1740
#define SWR_MSTR_START_REG_ADDR	0x00
#define SWR_MSTR_MAX_BUF_LEN     32
#define BYTES_PER_LINE          12
#define SWR_MSTR_RD_BUF_LEN      8
#define SWR_MSTR_WR_BUF_LEN      32

#define MAX_FIFO_RD_FAIL_RETRY 3

static struct swr_mstr_ctrl *dbgswrm;
static struct dentry *debugfs_swrm_dent;
static struct dentry *debugfs_peek;
static struct dentry *debugfs_poke;
static struct dentry *debugfs_reg_dump;
static unsigned int read_data;


static bool swrm_is_msm_variant(int val)
{
	return (val == SWRM_VERSION_1_3);
}

static int swrm_debug_open(struct inode *inode, struct file *file)
{
	file->private_data = inode->i_private;
	return 0;
}

static int get_parameters(char *buf, u32 *param1, int num_of_par)
{
	char *token;
	int base, cnt;

	token = strsep(&buf, " ");
	for (cnt = 0; cnt < num_of_par; cnt++) {
		if (token) {
			if ((token[1] == 'x') || (token[1] == 'X'))
				base = 16;
			else
				base = 10;

			if (kstrtou32(token, base, &param1[cnt]) != 0)
				return -EINVAL;

			token = strsep(&buf, " ");
		} else
			return -EINVAL;
	}
	return 0;
}

static ssize_t swrm_reg_show(char __user *ubuf, size_t count,
					  loff_t *ppos)
{
	int i, reg_val, len;
	ssize_t total = 0;
	char tmp_buf[SWR_MSTR_MAX_BUF_LEN];

	if (!ubuf || !ppos)
		return 0;

	for (i = (((int) *ppos / BYTES_PER_LINE) + SWR_MSTR_START_REG_ADDR);
		i <= SWR_MSTR_MAX_REG_ADDR; i += 4) {
		reg_val = dbgswrm->read(dbgswrm->handle, i);
		len = snprintf(tmp_buf, 25, "0x%.3x: 0x%.2x\n", i, reg_val);
		if ((total + len) >= count - 1)
			break;
		if (copy_to_user((ubuf + total), tmp_buf, len)) {
			pr_err("%s: fail to copy reg dump\n", __func__);
			total = -EFAULT;
			goto copy_err;
		}
		*ppos += len;
		total += len;
	}

copy_err:
	return total;
}

static ssize_t swrm_debug_read(struct file *file, char __user *ubuf,
				size_t count, loff_t *ppos)
{
	char lbuf[SWR_MSTR_RD_BUF_LEN];
	char *access_str;
	ssize_t ret_cnt;

	if (!count || !file || !ppos || !ubuf)
		return -EINVAL;

	access_str = file->private_data;
	if (*ppos < 0)
		return -EINVAL;

	if (!strcmp(access_str, "swrm_peek")) {
		snprintf(lbuf, sizeof(lbuf), "0x%x\n", read_data);
		ret_cnt = simple_read_from_buffer(ubuf, count, ppos, lbuf,
					       strnlen(lbuf, 7));
	} else if (!strcmp(access_str, "swrm_reg_dump")) {
		ret_cnt = swrm_reg_show(ubuf, count, ppos);
	} else {
		pr_err("%s: %s not permitted to read\n", __func__, access_str);
		ret_cnt = -EPERM;
	}
	return ret_cnt;
}

static ssize_t swrm_debug_write(struct file *filp,
	const char __user *ubuf, size_t cnt, loff_t *ppos)
{
	char lbuf[SWR_MSTR_WR_BUF_LEN];
	int rc;
	u32 param[5];
	char *access_str;

	if (!filp || !ppos || !ubuf)
		return -EINVAL;

	access_str = filp->private_data;
	if (cnt > sizeof(lbuf) - 1)
		return -EINVAL;

	rc = copy_from_user(lbuf, ubuf, cnt);
	if (rc)
		return -EFAULT;

	lbuf[cnt] = '\0';
	if (!strcmp(access_str, "swrm_poke")) {
		/* write */
		rc = get_parameters(lbuf, param, 2);
		if ((param[0] <= SWR_MSTR_MAX_REG_ADDR) &&
			(param[1] <= 0xFFFFFFFF) &&
			(rc == 0))
			rc = dbgswrm->write(dbgswrm->handle, param[0],
					    param[1]);
		else
			rc = -EINVAL;
	} else if (!strcmp(access_str, "swrm_peek")) {
		/* read */
		rc = get_parameters(lbuf, param, 1);
		if ((param[0] <= SWR_MSTR_MAX_REG_ADDR) && (rc == 0))
			read_data = dbgswrm->read(dbgswrm->handle, param[0]);
		else
			rc = -EINVAL;
	}
	if (rc == 0)
		rc = cnt;
	else
		pr_err("%s: rc = %d\n", __func__, rc);

	return rc;
}

static const struct file_operations swrm_debug_ops = {
	.open = swrm_debug_open,
	.write = swrm_debug_write,
	.read = swrm_debug_read,
};

static int swrm_clk_request(struct swr_mstr_ctrl *swrm, bool enable)
{
	if (!swrm->clk || !swrm->handle)
		return -EINVAL;

	if (enable) {
		swrm->clk_ref_count++;
		if (swrm->clk_ref_count == 1) {
			swrm->clk(swrm->handle, true);
			swrm->state = SWR_MSTR_UP;
		}
	} else if (--swrm->clk_ref_count == 0) {
		swrm->clk(swrm->handle, false);
		swrm->state = SWR_MSTR_DOWN;
	} else if (swrm->clk_ref_count < 0) {
		pr_err("%s: swrm clk count mismatch\n", __func__);
		swrm->clk_ref_count = 0;
	}
	return 0;
}

static int swrm_ahb_write(struct swr_mstr_ctrl *swrm,
					u16 reg, u32 *value)
{
	u32 temp = (u32)(*value);
	int ret;

	ret = swrm_clk_request(swrm, TRUE);

	if (ret)
		return -EINVAL;

	iowrite32(temp, swrm->swrm_dig_base + reg);

	swrm_clk_request(swrm, FALSE);

	return 0;
}

static int swrm_ahb_read(struct swr_mstr_ctrl *swrm,
					u16 reg, u32 *value)
{
	u32 temp = 0;
	int ret;

	ret = swrm_clk_request(swrm, TRUE);

	if (ret)
		return -EINVAL;

	temp = ioread32(swrm->swrm_dig_base + reg);
	*value = temp;
	swrm_clk_request(swrm, FALSE);
	return 0;
}

static u32 swr_master_read(struct swr_mstr_ctrl *swrm, unsigned int reg_addr)
{
	u32 val = 0;

	if (swrm->read)
		val = swrm->read(swrm->handle, reg_addr);
	else
		swrm_ahb_read(swrm, reg_addr, &val);
	return val;
}

static void swr_master_write(struct swr_mstr_ctrl *swrm, u16 reg_addr, u32 val)
{
	if (swrm->write)
		swrm->write(swrm->handle, reg_addr, val);
	else
		swrm_ahb_write(swrm, reg_addr, &val);
}

static int swr_master_bulk_write(struct swr_mstr_ctrl *swrm, u32 *reg_addr,
				u32 *val, unsigned int length)
{
	int i = 0;

	if (swrm->bulk_write)
		swrm->bulk_write(swrm->handle, reg_addr, val, length);
	else {
		for (i = 0; i < length; i++) {
		/* wait for FIFO WR command to complete to avoid overflow */
			usleep_range(100, 105);
			swr_master_write(swrm, reg_addr[i], val[i]);
		}
	}
	return 0;
}

static bool swrm_is_port_en(struct swr_master *mstr)
{
	return !!(mstr->num_port);
}

static int swrm_get_port_config(struct swr_mstr_ctrl *swrm)
{
	u8 master_device_id;
	int i;

	/* update device_id for tx/rx */
	master_device_id = MASTER_ID_WSA;

	switch (master_device_id & MASTER_ID_MASK) {
	case MASTER_ID_WSA:
		/* get port params for wsa */
		for (i = 0; i < SWR_MSTR_PORT_LEN; i++) {
		/* wsa uses single frame structure for all configurations */
			if (!swrm->mport_cfg[i].port_en)
				continue;
			swrm->mport_cfg[i].sinterval = wsa_frame_superset[i].si;
			swrm->mport_cfg[i].offset1 = wsa_frame_superset[i].off1;
			swrm->mport_cfg[i].offset2 = wsa_frame_superset[i].off2;
		}
		break;
	case MASTER_ID_RX:
		/* get port params for rx */
		break;
	case MASTER_ID_TX:
		/* get port params for tx */
		break;
	default: /* MASTER_GENERIC*/
		/* computer generic frame parameters */
		return -EINVAL;
	}
	return 0;
}

static int swrm_get_master_port(struct swr_mstr_ctrl *swrm, u8 *mstr_port_id,
					u8 *mstr_ch_mask, u8 mstr_prt_type,
					u8 slv_port_id)
{
	int i, j;
	*mstr_port_id = 0;

	for (i = 1; i <= swrm->num_ports; i++) {
		for (j = 0; j < SWR_MAX_CH_PER_PORT; j++) {
			if (swrm->port_mapping[i][j].port_type == mstr_prt_type)
				goto found;
		}
	}
found:
	if (i > swrm->num_ports || j == SWR_MAX_CH_PER_PORT)  {
		dev_err(swrm->dev, "%s: port type not supported by master\n",
					__func__);
		return -EINVAL;
	}
	/* id 0 corresponds to master port 1 */
	*mstr_port_id = i - 1;
	*mstr_ch_mask = swrm->port_mapping[i][j].ch_mask;

	return 0;

}

static u32 swrm_get_packed_reg_val(u8 *cmd_id, u8 cmd_data,
				 u8 dev_addr, u16 reg_addr)
{
	u32 val;
	u8 id = *cmd_id;

	if (id != SWR_BROADCAST_CMD_ID) {
		if (id < 14)
			id += 1;
		else
			id = 0;
		*cmd_id = id;
	}
	val = SWR_REG_VAL_PACK(cmd_data, dev_addr, id, reg_addr);

	return val;
}

static int swrm_cmd_fifo_rd_cmd(struct swr_mstr_ctrl *swrm, int *cmd_data,
				 u8 dev_addr, u8 cmd_id, u16 reg_addr,
				 u32 len)
{
	u32 val;
	u32 retry_attempt = 0;

	val = swrm_get_packed_reg_val(&swrm->rcmd_id, len, dev_addr, reg_addr);
	/* wait for FIFO RD to complete to avoid overflow */
	usleep_range(100, 105);
	swr_master_write(swrm, SWRM_CMD_FIFO_RD_CMD, val);
	/* wait for FIFO RD CMD complete to avoid overflow */
	usleep_range(250, 255);
retry_read:
	*cmd_data = swr_master_read(swrm, SWRM_CMD_FIFO_RD_FIFO_ADDR);
	dev_dbg(swrm->dev,
		"%s: reg: 0x%x, cmd_id: 0x%x, dev_num: 0x%x, cmd_data: 0x%x\n",
		__func__, reg_addr, cmd_id, dev_addr, *cmd_data);
	if ((((*cmd_data) & 0xF00) >> 8) != swrm->rcmd_id) {
		if (retry_attempt < MAX_FIFO_RD_FAIL_RETRY) {
			/* wait 500 us before retry on fifo read failure */
			usleep_range(500, 505);
			retry_attempt++;
			goto retry_read;
		} else {
			dev_err_ratelimited(swrm->dev,
				"%s: failed to read fifo\n", __func__);
		}
	}
	return 0;
}

static int swrm_cmd_fifo_wr_cmd(struct swr_mstr_ctrl *swrm, u8 cmd_data,
				 u8 dev_addr, u8 cmd_id, u16 reg_addr)
{
	u32 val;
	int ret = 0;

	if (!cmd_id)
		val = swrm_get_packed_reg_val(&swrm->wcmd_id, cmd_data,
					      dev_addr, reg_addr);
	else
		val = swrm_get_packed_reg_val(&cmd_id, cmd_data,
					      dev_addr, reg_addr);
	dev_dbg(swrm->dev,
		"%s: reg: 0x%x, cmd_id: 0x%x, val:0x%x, dev_num: 0x%x, cmd_data: 0x%x\n",
		__func__, reg_addr, cmd_id, val, dev_addr, cmd_data);
	/* wait for FIFO WR command to complete to avoid overflow */
	usleep_range(250, 255);
	swr_master_write(swrm, SWRM_CMD_FIFO_WR_CMD, val);
	if (cmd_id == 0xF) {
		/*
		 * sleep for 10ms for MSM soundwire variant to allow broadcast
		 * command to complete.
		 */
		if (swrm_is_msm_variant(swrm->version))
			usleep_range(10000, 10100);
		else
			wait_for_completion_timeout(&swrm->broadcast,
						    (2 * HZ/10));
	}
	return ret;
}

static int swrm_read(struct swr_master *master, u8 dev_num, u16 reg_addr,
		     void *buf, u32 len)
{
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);
	int ret = 0;
	int val;
	u8 *reg_val = (u8 *)buf;

	if (!swrm) {
		dev_err(&master->dev, "%s: swrm is NULL\n", __func__);
		return -EINVAL;
	}

	if (dev_num)
		ret = swrm_cmd_fifo_rd_cmd(swrm, &val, dev_num, 0, reg_addr,
					   len);
	else
		val = swr_master_read(swrm, reg_addr);

	if (!ret)
		*reg_val = (u8)val;

	pm_runtime_mark_last_busy(swrm->dev);

	return ret;
}

static int swrm_write(struct swr_master *master, u8 dev_num, u16 reg_addr,
		      const void *buf)
{
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);
	int ret = 0;
	u8 reg_val = *(u8 *)buf;

	if (!swrm) {
		dev_err(&master->dev, "%s: swrm is NULL\n", __func__);
		return -EINVAL;
	}

	if (dev_num)
		ret = swrm_cmd_fifo_wr_cmd(swrm, reg_val, dev_num, 0, reg_addr);
	else
		swr_master_write(swrm, reg_addr, reg_val);
	pm_runtime_mark_last_busy(swrm->dev);

	return ret;
}

static int swrm_bulk_write(struct swr_master *master, u8 dev_num, void *reg,
			   const void *buf, size_t len)
{
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);
	int ret = 0;
	int i;
	u32 *val;
	u32 *swr_fifo_reg;

	if (!swrm || !swrm->handle) {
		dev_err(&master->dev, "%s: swrm is NULL\n", __func__);
		return -EINVAL;
	}
	if (len <= 0)
		return -EINVAL;

	if (dev_num) {
		swr_fifo_reg = kcalloc(len, sizeof(u32), GFP_KERNEL);
		if (!swr_fifo_reg) {
			ret = -ENOMEM;
			goto err;
		}
		val = kcalloc(len, sizeof(u32), GFP_KERNEL);
		if (!val) {
			ret = -ENOMEM;
			goto mem_fail;
		}

		for (i = 0; i < len; i++) {
			val[i] = swrm_get_packed_reg_val(&swrm->wcmd_id,
							 ((u8 *)buf)[i],
							 dev_num,
							 ((u16 *)reg)[i]);
			swr_fifo_reg[i] = SWRM_CMD_FIFO_WR_CMD;
		}
		ret = swr_master_bulk_write(swrm, swr_fifo_reg, val, len);
		if (ret) {
			dev_err(&master->dev, "%s: bulk write failed\n",
				__func__);
			ret = -EINVAL;
		}
	} else {
		dev_err(&master->dev,
			"%s: No support of Bulk write for master regs\n",
			__func__);
		ret = -EINVAL;
		goto err;
	}
	kfree(val);
mem_fail:
	kfree(swr_fifo_reg);
err:
	pm_runtime_mark_last_busy(swrm->dev);
	return ret;
}

static u8 get_inactive_bank_num(struct swr_mstr_ctrl *swrm)
{
	return (swr_master_read(swrm, SWRM_MCP_STATUS) &
		SWRM_MCP_STATUS_BANK_NUM_MASK) ? 0 : 1;
}

static void enable_bank_switch(struct swr_mstr_ctrl *swrm, u8 bank,
				u8 row, u8 col)
{
	swrm_cmd_fifo_wr_cmd(swrm, ((row << 3) | col), 0xF, 0xF,
			SWRS_SCP_FRAME_CTRL_BANK(bank));
}

static struct swr_port_info *swrm_get_port_req(struct swrm_mports *mport,
						   u8 slv_port, u8 dev_num)
{
	struct swr_port_info *port_req = NULL;

	list_for_each_entry(port_req, &mport->port_req_list, list) {
	/* Store dev_id instead of dev_num if enumeration is changed run_time */
		if ((port_req->slave_port_id == slv_port)
			&& (port_req->dev_num == dev_num))
			return port_req;
	}
	return NULL;
}

static bool swrm_remove_from_group(struct swr_master *master)
{
	struct swr_device *swr_dev;
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);
	bool is_removed = false;

	if (!swrm)
		goto end;

	mutex_lock(&swrm->mlock);
	if ((swrm->num_rx_chs > 1) &&
	    (swrm->num_rx_chs == swrm->num_cfg_devs)) {
		list_for_each_entry(swr_dev, &master->devices,
				dev_list) {
			swr_dev->group_id = SWR_GROUP_NONE;
			master->gr_sid = 0;
		}
		is_removed = true;
	}
	mutex_unlock(&swrm->mlock);

end:
	return is_removed;
}

static void swrm_disable_ports(struct swr_master *master,
					     u8 bank)
{
	u32 value;
	struct swr_port_info *port_req;
	int i;
	struct swrm_mports *mport;
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);

	if (!swrm) {
		pr_err("%s: swrm is null\n", __func__);
		return;
	}

	dev_dbg(swrm->dev, "%s: master num_port: %d\n", __func__,
		master->num_port);


	for (i = 0; i < SWR_MSTR_PORT_LEN ; i++) {

		mport = &(swrm->mport_cfg[i]);
		if (!mport->port_en)
			continue;

		list_for_each_entry(port_req, &mport->port_req_list, list) {
			/* skip ports with no change req's*/
			if (port_req->req_ch == port_req->ch_en)
				continue;

			swrm_cmd_fifo_wr_cmd(swrm, port_req->req_ch,
					port_req->dev_num, 0x00,
			SWRS_DP_CHANNEL_ENABLE_BANK(port_req->slave_port_id,
					bank));
			dev_dbg(swrm->dev, "%s: mport :%d, reg: 0x%x\n",
				__func__, i,
				(SWRM_DP_PORT_CTRL_BANK(i + 1, bank)));
		}
		value = ((mport->req_ch)
					<< SWRM_DP_PORT_CTRL_EN_CHAN_SHFT);
		value |= ((mport->offset2)
					<< SWRM_DP_PORT_CTRL_OFFSET2_SHFT);
		value |= ((mport->offset1)
				<< SWRM_DP_PORT_CTRL_OFFSET1_SHFT);
		value |= mport->sinterval;

		swr_master_write(swrm,
				SWRM_DP_PORT_CTRL_BANK(i+1, bank),
				value);
		dev_dbg(swrm->dev, "%s: mport :%d, reg: 0x%x, val: 0x%x\n",
			__func__, i,
			(SWRM_DP_PORT_CTRL_BANK(i+1, bank)), value);
	}
}

static void swrm_cleanup_disabled_port_reqs(struct swr_master *master)
{
	struct swr_port_info *port_req, *next;
	int i;
	struct swrm_mports *mport;
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);

	if (!swrm) {
		pr_err("%s: swrm is null\n", __func__);
		return;
	}
	dev_dbg(swrm->dev, "%s: master num_port: %d\n", __func__,
		master->num_port);

	for (i = 0; i < SWR_MSTR_PORT_LEN; i++) {
		mport = &(swrm->mport_cfg[i]);
		list_for_each_entry_safe(port_req, next,
			&mport->port_req_list, list) {
			/* skip ports without new ch req */
			if (port_req->ch_en == port_req->req_ch)
				continue;

			/* remove new ch req's*/
			port_req->req_ch = port_req->ch_en;

			/* If no streams enabled on port, remove the port req */
			if (port_req->ch_en == 0) {
				list_del(&port_req->list);
				kfree(port_req);
			}
		}
		/* remove new ch req's on mport*/
		mport->req_ch = mport->ch_en;

		if (!(mport->ch_en)) {
			mport->port_en = false;
			master->port_en_mask &= ~i;
		}
	}
}
static void swrm_copy_data_port_config(struct swr_master *master, u8 bank)
{
	u32 value, slv_id;
	struct swr_port_info *port_req;
	int i;
	struct swrm_mports *mport;
	u32 reg[SWRM_MAX_PORT_REG];
	u32 val[SWRM_MAX_PORT_REG];
	int len = 0;
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);

	if (!swrm) {
		pr_err("%s: swrm is null\n", __func__);
		return;
	}

	dev_dbg(swrm->dev, "%s: master num_port: %d\n", __func__,
		master->num_port);

	for (i = 0; i < SWR_MSTR_PORT_LEN; i++) {
		mport = &(swrm->mport_cfg[i]);
		if (!mport->port_en)
			continue;

		list_for_each_entry(port_req, &mport->port_req_list, list) {
			slv_id = port_req->slave_port_id;
			reg[len] = SWRM_CMD_FIFO_WR_CMD;
			val[len++] = SWR_REG_VAL_PACK(port_req->req_ch,
					port_req->dev_num, 0x00,
					SWRS_DP_CHANNEL_ENABLE_BANK(slv_id,
								bank));

			reg[len] = SWRM_CMD_FIFO_WR_CMD;
			val[len++] = SWR_REG_VAL_PACK(mport->sinterval,
					port_req->dev_num, 0x00,
					SWRS_DP_SAMPLE_CONTROL_1_BANK(slv_id,
								bank));

			reg[len] = SWRM_CMD_FIFO_WR_CMD;
			val[len++] = SWR_REG_VAL_PACK(mport->offset1,
					port_req->dev_num, 0x00,
					SWRS_DP_OFFSET_CONTROL_1_BANK(slv_id,
								bank));

			if (port_req->slave_port_id) {
				reg[len] = SWRM_CMD_FIFO_WR_CMD;
				val[len++] = SWR_REG_VAL_PACK(mport->offset2,
						port_req->dev_num, 0x00,
						SWRS_DP_OFFSET_CONTROL_2_BANK(
							slv_id, bank));
			}
			port_req->ch_en = port_req->req_ch;
		}
		value = ((mport->req_ch)
				<< SWRM_DP_PORT_CTRL_EN_CHAN_SHFT);
		value |= ((mport->offset2)
				<< SWRM_DP_PORT_CTRL_OFFSET2_SHFT);
		value |= ((mport->offset1)
				<< SWRM_DP_PORT_CTRL_OFFSET1_SHFT);
		value |= mport->sinterval;


		reg[len] = SWRM_DP_PORT_CTRL_BANK(i + 1, bank);
		val[len++] = value;

		dev_dbg(swrm->dev, "%s: mport :%d, reg: 0x%x, val: 0x%x\n",
			__func__, i,
			(SWRM_DP_PORT_CTRL_BANK(i + 1, bank)), value);

		mport->ch_en = mport->req_ch;

	}
	swr_master_bulk_write(swrm, reg, val, len);
}

static void swrm_apply_port_config(struct swr_master *master)
{
	u8 bank;
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);

	if (!swrm) {
		pr_err("%s: Invalid handle to swr controller\n",
			__func__);
		return;
	}

	bank = get_inactive_bank_num(swrm);
	dev_dbg(swrm->dev, "%s: enter bank: %d master_ports: %d\n",
		__func__, bank, master->num_port);


	swrm_cmd_fifo_wr_cmd(swrm, 0x01, 0xF, 0x00,
			SWRS_SCP_HOST_CLK_DIV2_CTL_BANK(bank));

	swrm_copy_data_port_config(master, bank);
}

static int swrm_slvdev_datapath_control(struct swr_master *master, bool enable)
{
	u8 bank;
	u32 value, n_col;
	int ret;
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);
	int mask = (SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_BMSK |
		    SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_BMSK |
		    SWRM_MCP_FRAME_CTRL_BANK_SSP_PERIOD_BMSK);
	u8 inactive_bank;

	if (!swrm) {
		pr_err("%s: swrm is null\n", __func__);
		return -EFAULT;
	}
	mutex_lock(&swrm->mlock);

	if (enable)
		pm_runtime_get_sync(swrm->dev);
	bank = get_inactive_bank_num(swrm);

	if (enable) {
		ret = swrm_get_port_config(swrm);
		if (ret) {
			/* cannot accommodate ports */
			swrm_cleanup_disabled_port_reqs(master);
			pm_runtime_mark_last_busy(swrm->dev);
			pm_runtime_put_autosuspend(swrm->dev);
			mutex_unlock(&swrm->mlock);
			return -EINVAL;
		}
		/* apply the new port config*/
		swrm_apply_port_config(master);
	} else {
		swrm_disable_ports(master, bank);
	}
	dev_dbg(swrm->dev, "%s: enable: %d, cfg_devs: %d\n",
		__func__, enable, swrm->num_cfg_devs);

	if (enable) {
		/* set Row = 48 and col = 16 */
		n_col = SWR_MAX_COL;
	} else {
		/*
		 * Do not change to 48x2 if there are still active ports
		 */
		if (!master->num_port)
			n_col = SWR_MIN_COL;
		else
			n_col = SWR_MAX_COL;
	}

	value = swr_master_read(swrm, SWRM_MCP_FRAME_CTRL_BANK_ADDR(bank));
	value &= (~mask);
	value |= ((0 << SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_SHFT) |
		  (n_col << SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_SHFT) |
		  (0 << SWRM_MCP_FRAME_CTRL_BANK_SSP_PERIOD_SHFT));
	swr_master_write(swrm, SWRM_MCP_FRAME_CTRL_BANK_ADDR(bank), value);

	dev_dbg(swrm->dev, "%s: regaddr: 0x%x, value: 0x%x\n", __func__,
		SWRM_MCP_FRAME_CTRL_BANK_ADDR(bank), value);

	enable_bank_switch(swrm, bank, SWR_MAX_ROW, n_col);
	inactive_bank = bank ? 0 : 1;

	if (enable)
		swrm_copy_data_port_config(master, inactive_bank);
	else {
		swrm_disable_ports(master, inactive_bank);
		swrm_cleanup_disabled_port_reqs(master);
		dev_dbg(&master->dev, "%s: pm_runtime auto suspend triggered\n",
			__func__);
		pm_runtime_mark_last_busy(swrm->dev);
		pm_runtime_put_autosuspend(swrm->dev);
	}
	mutex_unlock(&swrm->mlock);
return 0;
}

static int swrm_connect_port(struct swr_master *master,
			struct swr_params *portinfo)
{
	int i;
	struct swr_port_info *port_req;
	int ret = 0;
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);
	struct swrm_mports *mport;
	u8 mstr_port_id, mstr_ch_msk;

	dev_dbg(&master->dev, "%s: enter\n", __func__);
	if (!portinfo)
		return -EINVAL;

	if (!swrm) {
		dev_err(&master->dev,
			"%s: Invalid handle to swr controller\n",
			__func__);
		return -EINVAL;
	}

	mutex_lock(&swrm->mlock);

	for (i = 0; i < portinfo->num_port; i++) {
		ret = swrm_get_master_port(swrm, &mstr_port_id, &mstr_ch_msk,
						portinfo->port_type[i],
						portinfo->port_id[i]);
		if (ret) {
			dev_err(&master->dev,
				"%s: mstr portid for slv port %d not found\n",
				__func__, portinfo->port_id[i]);
			goto port_fail;
		}

		mport = &(swrm->mport_cfg[mstr_port_id]);
		/* get port req */
		port_req = swrm_get_port_req(mport, portinfo->port_id[i],
					portinfo->dev_num);
		if (!port_req) {
			dev_dbg(&master->dev, "%s: new req:port id %d dev %d\n",
						 __func__, portinfo->port_id[i],
						portinfo->dev_num);
			port_req = kzalloc(sizeof(struct swr_port_info),
					GFP_KERNEL);
			if (!port_req) {
				ret = -ENOMEM;
				goto mem_fail;
			}
			port_req->dev_num = portinfo->dev_num;
			port_req->slave_port_id = portinfo->port_id[i];
			port_req->num_ch = portinfo->num_ch[i];
			port_req->ch_rate = portinfo->ch_rate[i];
			port_req->ch_en = 0;
			port_req->master_port_id = mstr_port_id;
			list_add(&port_req->list, &mport->port_req_list);
		}
		port_req->req_ch |= portinfo->ch_en[i];

		dev_dbg(&master->dev,
			"%s: mstr port %d, slv port %d ch_rate %d num_ch %d\n",
			__func__, port_req->master_port_id,
			port_req->slave_port_id, port_req->ch_rate,
			port_req->num_ch);
		/* Put the port req on master port */
		mport = &(swrm->mport_cfg[mstr_port_id]);
		mport->port_en = true;
		mport->req_ch |= mstr_ch_msk;
		master->port_en_mask |= (1 << mstr_port_id);
	}
	master->num_port += portinfo->num_port;
	swr_port_response(master, portinfo->tid);

	mutex_unlock(&swrm->mlock);
	return 0;

port_fail:
mem_fail:
	/* cleanup  port reqs in error condition */
	swrm_cleanup_disabled_port_reqs(master);
	mutex_unlock(&swrm->mlock);
	return ret;
}

static int swrm_disconnect_port(struct swr_master *master,
			struct swr_params *portinfo)
{
	int i, ret = 0;
	struct swr_port_info *port_req;
	struct swrm_mports *mport;
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(master);
	u8 mstr_port_id, mstr_ch_mask;

	if (!swrm) {
		dev_err(&master->dev,
			"%s: Invalid handle to swr controller\n",
			__func__);
		return -EINVAL;
	}

	if (!portinfo) {
		dev_err(&master->dev, "%s: portinfo is NULL\n", __func__);
		return -EINVAL;
	}
	mutex_lock(&swrm->mlock);

	for (i = 0; i < portinfo->num_port; i++) {

		ret = swrm_get_master_port(swrm, &mstr_port_id, &mstr_ch_mask,
				portinfo->port_type[i], portinfo->port_id[i]);
		if (ret) {
			dev_err(&master->dev,
				"%s: mstr portid for slv port %d not found\n",
				__func__, portinfo->port_id[i]);
			mutex_unlock(&swrm->mlock);
			return -EINVAL;
		}
		mport = &(swrm->mport_cfg[mstr_port_id]);
		/* get port req */
		port_req = swrm_get_port_req(mport, portinfo->port_id[i],
					portinfo->dev_num);

		if (!port_req) {
			dev_err(&master->dev, "%s:port not enabled : port %d\n",
					 __func__, portinfo->port_id[i]);
			return -EINVAL;
		}
		port_req->req_ch &= ~portinfo->ch_en[i];
		mport->req_ch &= ~mstr_ch_mask;
	}
	master->num_port -= portinfo->num_port;
	swr_port_response(master, portinfo->tid);
	mutex_unlock(&swrm->mlock);

	return 0;
}

static int swrm_check_slave_change_status(struct swr_mstr_ctrl *swrm,
					int status, u8 *devnum)
{
	int i;
	int new_sts = status;
	int ret = SWR_NOT_PRESENT;

	if (status != swrm->slave_status) {
		for (i = 0; i < (swrm->master.num_dev + 1); i++) {
			if ((status & SWRM_MCP_SLV_STATUS_MASK) !=
			    (swrm->slave_status & SWRM_MCP_SLV_STATUS_MASK)) {
				ret = (status & SWRM_MCP_SLV_STATUS_MASK);
				*devnum = i;
				break;
			}
			status >>= 2;
			swrm->slave_status >>= 2;
		}
		swrm->slave_status = new_sts;
	}
	return ret;
}

static irqreturn_t swr_mstr_interrupt(int irq, void *dev)
{
	struct swr_mstr_ctrl *swrm = dev;
	u32 value, intr_sts;
	int status, chg_sts, i;
	u8 devnum = 0;
	int ret = IRQ_HANDLED;
	struct swr_device *swr_dev;
	struct swr_master *mstr = &swrm->master;


	mutex_lock(&swrm->reslock);
	swrm_clk_request(swrm, true);
	mutex_unlock(&swrm->reslock);

	intr_sts = swr_master_read(swrm, SWRM_INTERRUPT_STATUS);
	intr_sts &= SWRM_INTERRUPT_STATUS_RMSK;
	for (i = 0; i < SWRM_INTERRUPT_MAX; i++) {
		value = intr_sts & (1 << i);
		if (!value)
			continue;

		swr_master_write(swrm, SWRM_INTERRUPT_CLEAR, value);
		switch (value) {
		case SWRM_INTERRUPT_STATUS_SLAVE_PEND_IRQ:
			dev_dbg(swrm->dev, "Trigger irq to slave device\n");
			status = swr_master_read(swrm, SWRM_MCP_SLV_STATUS);
			swrm_check_slave_change_status(swrm, status,
								&devnum);
			list_for_each_entry(swr_dev, &mstr->devices, dev_list) {
				if (swr_dev->dev_num != devnum)
					continue;
				if (swr_dev->slave_irq)
					handle_nested_irq(swr_dev->slave_irq);
			}
			break;
		case SWRM_INTERRUPT_STATUS_NEW_SLAVE_ATTACHED:
			dev_dbg(swrm->dev, "SWR new slave attached\n");
			break;
		case SWRM_INTERRUPT_STATUS_CHANGE_ENUM_SLAVE_STATUS:
			status = swr_master_read(swrm, SWRM_MCP_SLV_STATUS);
			if (status == swrm->slave_status) {
				dev_dbg(swrm->dev,
					"%s: No change in slave status: %d\n",
					__func__, status);
				break;
			}
			chg_sts = swrm_check_slave_change_status(swrm, status,
								&devnum);
			switch (chg_sts) {
			case SWR_NOT_PRESENT:
				dev_dbg(swrm->dev, "device %d got detached\n",
					devnum);
				break;
			case SWR_ATTACHED_OK:
				dev_dbg(swrm->dev, "device %d got attached\n",
					devnum);
				break;
			case SWR_ALERT:
				dev_dbg(swrm->dev,
					"device %d has pending interrupt\n",
					devnum);
				break;
			}
			break;
		case SWRM_INTERRUPT_STATUS_MASTER_CLASH_DET:
			dev_err_ratelimited(swrm->dev,
					"SWR bus clsh detected\n");
			break;
		case SWRM_INTERRUPT_STATUS_RD_FIFO_OVERFLOW:
			dev_dbg(swrm->dev, "SWR read FIFO overflow\n");
			break;
		case SWRM_INTERRUPT_STATUS_RD_FIFO_UNDERFLOW:
			dev_dbg(swrm->dev, "SWR read FIFO underflow\n");
			break;
		case SWRM_INTERRUPT_STATUS_WR_CMD_FIFO_OVERFLOW:
			dev_dbg(swrm->dev, "SWR write FIFO overflow\n");
			break;
		case SWRM_INTERRUPT_STATUS_CMD_ERROR:
			value = swr_master_read(swrm, SWRM_CMD_FIFO_STATUS);
			dev_err_ratelimited(swrm->dev,
			"SWR CMD error, fifo status 0x%x, flushing fifo\n",
					    value);
			swr_master_write(swrm, SWRM_CMD_FIFO_CMD, 0x1);
			break;
		case SWRM_INTERRUPT_STATUS_DOUT_PORT_COLLISION:
			dev_dbg(swrm->dev, "SWR Port collision detected\n");
			break;
		case SWRM_INTERRUPT_STATUS_READ_EN_RD_VALID_MISMATCH:
			dev_dbg(swrm->dev, "SWR read enable valid mismatch\n");
			break;
		case SWRM_INTERRUPT_STATUS_SPECIAL_CMD_ID_FINISHED:
			complete(&swrm->broadcast);
			dev_dbg(swrm->dev, "SWR cmd id finished\n");
			break;
		case SWRM_INTERRUPT_STATUS_NEW_SLAVE_AUTO_ENUM_FINISHED:
			break;
		case SWRM_INTERRUPT_STATUS_AUTO_ENUM_FAILED:
			break;
		case SWRM_INTERRUPT_STATUS_AUTO_ENUM_TABLE_IS_FULL:
			break;
		case SWRM_INTERRUPT_STATUS_BUS_RESET_FINISHED:
			complete(&swrm->reset);
			break;
		case SWRM_INTERRUPT_STATUS_CLK_STOP_FINISHED:
			break;
		default:
			dev_err_ratelimited(swrm->dev,
					"SWR unknown interrupt\n");
			ret = IRQ_NONE;
			break;
		}
	}

	mutex_lock(&swrm->reslock);
	swrm_clk_request(swrm, false);
	mutex_unlock(&swrm->reslock);
	return ret;
}

static int swrm_get_device_status(struct swr_mstr_ctrl *swrm, u8 devnum)
{
	u32 val;

	swrm->slave_status = swr_master_read(swrm, SWRM_MCP_SLV_STATUS);
	val = (swrm->slave_status >> (devnum * 2));
	val &= SWRM_MCP_SLV_STATUS_MASK;
	return val;
}

static int swrm_get_logical_dev_num(struct swr_master *mstr, u64 dev_id,
				u8 *dev_num)
{
	int i;
	u64 id = 0;
	int ret = -EINVAL;
	struct swr_mstr_ctrl *swrm = swr_get_ctrl_data(mstr);
	struct swr_device *swr_dev;
	u32 num_dev = 0;

	if (!swrm) {
		pr_err("%s: Invalid handle to swr controller\n",
			__func__);
		return ret;
	}
	if (swrm->num_dev)
		num_dev = swrm->num_dev;
	else
		num_dev = mstr->num_dev;

	pm_runtime_get_sync(swrm->dev);
	for (i = 1; i < (num_dev + 1); i++) {
		id = ((u64)(swr_master_read(swrm,
			    SWRM_ENUMERATOR_SLAVE_DEV_ID_2(i))) << 32);
		id |= swr_master_read(swrm,
					SWRM_ENUMERATOR_SLAVE_DEV_ID_1(i));
		/*
		 * As pm_runtime_get_sync() brings all slaves out of reset
		 * update logical device number for all slaves.
		 */
		list_for_each_entry(swr_dev, &mstr->devices, dev_list) {
			if (swr_dev->addr == (id & SWR_DEV_ID_MASK)) {
				u32 status = swrm_get_device_status(swrm, i);

				if ((status == 0x01) || (status == 0x02)) {
					swr_dev->dev_num = i;
					if ((id & SWR_DEV_ID_MASK) == dev_id) {
						*dev_num = i;
						ret = 0;
					}
					dev_dbg(swrm->dev,
						"%s: devnum %d is assigned for dev addr %lx\n",
						__func__, i, swr_dev->addr);
				}
			}
		}
	}
	if (ret)
		dev_err(swrm->dev, "%s: device 0x%llx is not ready\n",
			__func__, dev_id);

	pm_runtime_mark_last_busy(swrm->dev);
	pm_runtime_put_autosuspend(swrm->dev);
	return ret;
}
static int swrm_master_init(struct swr_mstr_ctrl *swrm)
{
	int ret = 0;
	u32 val;
	u8 row_ctrl = SWR_MAX_ROW;
	u8 col_ctrl = SWR_MIN_COL;
	u8 ssp_period = 1;
	u8 retry_cmd_num = 3;
	u32 reg[SWRM_MAX_INIT_REG];
	u32 value[SWRM_MAX_INIT_REG];
	int len = 0;

	/* Clear Rows and Cols */
	val = ((row_ctrl << SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_SHFT) |
		(col_ctrl << SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_SHFT) |
		(ssp_period << SWRM_MCP_FRAME_CTRL_BANK_SSP_PERIOD_SHFT));

	reg[len] = SWRM_MCP_FRAME_CTRL_BANK_ADDR(0);
	value[len++] = val;

	/* Set Auto enumeration flag */
	reg[len] = SWRM_ENUMERATOR_CFG_ADDR;
	value[len++] = 1;

	/* Mask soundwire interrupts */
	reg[len] = SWRM_INTERRUPT_MASK_ADDR;
	value[len++] = 0x1FFFD;

	/* Configure No pings */
	val = swr_master_read(swrm, SWRM_MCP_CFG_ADDR);
	val &= ~SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_BMSK;
	val |= (0x1f << SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_SHFT);
	reg[len] = SWRM_MCP_CFG_ADDR;
	value[len++] = val;

	/* Configure number of retries of a read/write cmd */
	val = (retry_cmd_num << SWRM_CMD_FIFO_CFG_NUM_OF_CMD_RETRY_SHFT);
	reg[len] = SWRM_CMD_FIFO_CFG_ADDR;
	value[len++] = val;

	/* Set IRQ to PULSE */
	reg[len] = SWRM_COMP_CFG_ADDR;
	value[len++] = 0x02;

	reg[len] = SWRM_COMP_CFG_ADDR;
	value[len++] = 0x03;

	reg[len] = SWRM_INTERRUPT_CLEAR;
	value[len++] = 0x08;

	swr_master_bulk_write(swrm, reg, value, len);

	return ret;
}

static int swrm_probe(struct platform_device *pdev)
{
	struct swr_mstr_ctrl *swrm;
	struct swr_ctrl_platform_data *pdata;
	u32 i, num_ports, port_num, port_type, ch_mask;
	u32 *temp, map_size, map_length, ch_iter = 0, old_port_num = 0;
	int ret = 0;

	/* Allocate soundwire master driver structure */
	swrm = devm_kzalloc(&pdev->dev, sizeof(struct swr_mstr_ctrl),
			GFP_KERNEL);
	if (!swrm) {
		ret = -ENOMEM;
		goto err_memory_fail;
	}
	swrm->dev = &pdev->dev;
	platform_set_drvdata(pdev, swrm);
	swr_set_ctrl_data(&swrm->master, swrm);
	pdata = dev_get_platdata(&pdev->dev);
	if (!pdata) {
		dev_err(&pdev->dev, "%s: pdata from parent is NULL\n",
			__func__);
		ret = -EINVAL;
		goto err_pdata_fail;
	}
	swrm->handle = (void *)pdata->handle;
	if (!swrm->handle) {
		dev_err(&pdev->dev, "%s: swrm->handle is NULL\n",
			__func__);
		ret = -EINVAL;
		goto err_pdata_fail;
	}
	if (!(of_property_read_u32(pdev->dev.of_node,
			"swrm-io-base", &swrm->swrm_base_reg)))
		ret = of_property_read_u32(pdev->dev.of_node,
			"swrm-io-base", &swrm->swrm_base_reg);
	if (!swrm->swrm_base_reg) {
		swrm->read = pdata->read;
		if (!swrm->read) {
			dev_err(&pdev->dev, "%s: swrm->read is NULL\n",
				__func__);
			ret = -EINVAL;
			goto err_pdata_fail;
		}
		swrm->write = pdata->write;
		if (!swrm->write) {
			dev_err(&pdev->dev, "%s: swrm->write is NULL\n",
				__func__);
			ret = -EINVAL;
			goto err_pdata_fail;
		}
		swrm->bulk_write = pdata->bulk_write;
		if (!swrm->bulk_write) {
			dev_err(&pdev->dev, "%s: swrm->bulk_write is NULL\n",
				__func__);
			ret = -EINVAL;
			goto err_pdata_fail;
		}
	} else {
		swrm->swrm_dig_base = devm_ioremap(&pdev->dev,
					swrm->swrm_base_reg, SWRM_MAX_REGISTER);
	}

	swrm->clk = pdata->clk;
	if (!swrm->clk) {
		dev_err(&pdev->dev, "%s: swrm->clk is NULL\n",
			__func__);
		ret = -EINVAL;
		goto err_pdata_fail;
	}

	/* Parse soundwire port mapping */
	ret = of_property_read_u32(pdev->dev.of_node, "qcom,swr-num-ports",
				&num_ports);
	if (ret) {
		dev_err(swrm->dev, "%s: Failed to get num_ports\n", __func__);
		goto err_pdata_fail;
	}
	swrm->num_ports = num_ports;

	if (!of_find_property(pdev->dev.of_node, "qcom,swr-port-mapping",
				&map_size)) {
		dev_err(swrm->dev, "missing port mapping\n");
		goto err_pdata_fail;
	}

	map_length = map_size / (3 * sizeof(u32));
	if (num_ports > SWR_MSTR_PORT_LEN) {
		dev_err(&pdev->dev, "%s:invalid number of swr ports\n",
			__func__);
		ret = -EINVAL;
		goto err_pdata_fail;
	}
	temp = devm_kzalloc(&pdev->dev, map_size, GFP_KERNEL);

	if (!temp) {
		ret = -ENOMEM;
		goto err_pdata_fail;
	}
	ret = of_property_read_u32_array(pdev->dev.of_node,
				"qcom,swr-port-mapping", temp, 3 * map_length);
	if (ret) {
		dev_err(swrm->dev, "%s: Failed to read port mapping\n",
					__func__);
		goto err_pdata_fail;
	}

	for (i = 0; i < map_length; i++) {
		port_num = temp[3 * i];
		port_type = temp[3 * i + 1];
		ch_mask = temp[3 * i + 2];

		if (port_num != old_port_num)
			ch_iter = 0;
		swrm->port_mapping[port_num][ch_iter].port_type = port_type;
		swrm->port_mapping[port_num][ch_iter++].ch_mask = ch_mask;
		old_port_num = port_num;
	}
	devm_kfree(&pdev->dev, temp);

	swrm->reg_irq = pdata->reg_irq;
	swrm->master.read = swrm_read;
	swrm->master.write = swrm_write;
	swrm->master.bulk_write = swrm_bulk_write;
	swrm->master.get_logical_dev_num = swrm_get_logical_dev_num;
	swrm->master.connect_port = swrm_connect_port;
	swrm->master.disconnect_port = swrm_disconnect_port;
	swrm->master.slvdev_datapath_control = swrm_slvdev_datapath_control;
	swrm->master.remove_from_group = swrm_remove_from_group;
	swrm->master.dev.parent = &pdev->dev;
	swrm->master.dev.of_node = pdev->dev.of_node;
	swrm->master.num_port = 0;
	swrm->rcmd_id = 0;
	swrm->wcmd_id = 0;
	swrm->slave_status = 0;
	swrm->num_rx_chs = 0;
	swrm->clk_ref_count = 0;
	swrm->state = SWR_MSTR_RESUME;
	init_completion(&swrm->reset);
	init_completion(&swrm->broadcast);
	mutex_init(&swrm->mlock);
	mutex_init(&swrm->reslock);
	mutex_init(&swrm->force_down_lock);

	for (i = 0 ; i < SWR_MSTR_PORT_LEN; i++)
		INIT_LIST_HEAD(&swrm->mport_cfg[i].port_req_list);

	ret = of_property_read_u32(swrm->dev->of_node, "qcom,swr-num-dev",
				   &swrm->num_dev);
	if (ret) {
		dev_dbg(&pdev->dev, "%s: Looking up %s property failed\n",
			__func__, "qcom,swr-num-dev");
	} else {
		if (swrm->num_dev > SWR_MAX_SLAVE_DEVICES) {
			dev_err(&pdev->dev, "%s: num_dev %d > max limit %d\n",
				__func__, swrm->num_dev, SWR_MAX_SLAVE_DEVICES);
			ret = -EINVAL;
			goto err_pdata_fail;
		}
	}
	if (swrm->reg_irq) {
		ret = swrm->reg_irq(swrm->handle, swr_mstr_interrupt, swrm,
			    SWR_IRQ_REGISTER);
		if (ret) {
			dev_err(&pdev->dev, "%s: IRQ register failed ret %d\n",
				__func__, ret);
			goto err_irq_fail;
		}
	} else {
		swrm->irq = platform_get_irq_byname(pdev, "swr_master_irq");
		if (swrm->irq < 0) {
			dev_err(swrm->dev, "%s() error getting irq hdle: %d\n",
					__func__, swrm->irq);
			goto err_irq_fail;
		}

		ret = request_threaded_irq(swrm->irq, NULL,
					   swr_mstr_interrupt,
					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					   "swr_master_irq", swrm);
		if (ret) {
			dev_err(swrm->dev, "%s: Failed to request irq %d\n",
				__func__, ret);
			goto err_irq_fail;
		}

	}

	ret = swr_register_master(&swrm->master);
	if (ret) {
		dev_err(&pdev->dev, "%s: error adding swr master\n", __func__);
		goto err_mstr_fail;
	}

	/* Add devices registered with board-info as the
	 * controller will be up now
	 */
	swr_master_add_boarddevices(&swrm->master);
	mutex_lock(&swrm->mlock);
	swrm_clk_request(swrm, true);
	ret = swrm_master_init(swrm);
	if (ret < 0) {
		dev_err(&pdev->dev,
			"%s: Error in master Initialization , err %d\n",
			__func__, ret);
		mutex_unlock(&swrm->mlock);
		goto err_mstr_fail;
	}
	swrm->version = swr_master_read(swrm, SWRM_COMP_HW_VERSION);

	mutex_unlock(&swrm->mlock);

	if (pdev->dev.of_node)
		of_register_swr_devices(&swrm->master);

	dbgswrm = swrm;
	debugfs_swrm_dent = debugfs_create_dir(dev_name(&pdev->dev), 0);
	if (!IS_ERR(debugfs_swrm_dent)) {
		debugfs_peek = debugfs_create_file("swrm_peek",
				S_IFREG | 0444, debugfs_swrm_dent,
				(void *) "swrm_peek", &swrm_debug_ops);

		debugfs_poke = debugfs_create_file("swrm_poke",
				S_IFREG | 0444, debugfs_swrm_dent,
				(void *) "swrm_poke", &swrm_debug_ops);

		debugfs_reg_dump = debugfs_create_file("swrm_reg_dump",
				   S_IFREG | 0444, debugfs_swrm_dent,
				   (void *) "swrm_reg_dump",
				   &swrm_debug_ops);
	}
	pm_runtime_set_autosuspend_delay(&pdev->dev, auto_suspend_timer);
	pm_runtime_use_autosuspend(&pdev->dev);
	pm_runtime_set_active(&pdev->dev);
	pm_runtime_enable(&pdev->dev);
	pm_runtime_mark_last_busy(&pdev->dev);

	return 0;
err_mstr_fail:
	if (swrm->reg_irq)
		swrm->reg_irq(swrm->handle, swr_mstr_interrupt,
				swrm, SWR_IRQ_FREE);
	else if (swrm->irq)
		free_irq(swrm->irq, swrm);
err_irq_fail:
	mutex_destroy(&swrm->mlock);
	mutex_destroy(&swrm->reslock);
	mutex_destroy(&swrm->force_down_lock);
err_pdata_fail:
err_memory_fail:
	return ret;
}

static int swrm_remove(struct platform_device *pdev)
{
	struct swr_mstr_ctrl *swrm = platform_get_drvdata(pdev);

	if (swrm->reg_irq)
		swrm->reg_irq(swrm->handle, swr_mstr_interrupt,
				swrm, SWR_IRQ_FREE);
	else if (swrm->irq)
		free_irq(swrm->irq, swrm);
	pm_runtime_disable(&pdev->dev);
	pm_runtime_set_suspended(&pdev->dev);
	swr_unregister_master(&swrm->master);
	mutex_destroy(&swrm->mlock);
	mutex_destroy(&swrm->reslock);
	mutex_destroy(&swrm->force_down_lock);
	devm_kfree(&pdev->dev, swrm);
	return 0;
}

static int swrm_clk_pause(struct swr_mstr_ctrl *swrm)
{
	u32 val;

	dev_dbg(swrm->dev, "%s: state: %d\n", __func__, swrm->state);
	swr_master_write(swrm, SWRM_INTERRUPT_MASK_ADDR, 0x1FDFD);
	val = swr_master_read(swrm, SWRM_MCP_CFG_ADDR);
	val |= SWRM_MCP_CFG_BUS_CLK_PAUSE_BMSK;
	swr_master_write(swrm, SWRM_MCP_CFG_ADDR, val);
	swrm->state = SWR_MSTR_PAUSE;

	return 0;
}

#ifdef CONFIG_PM
static int swrm_runtime_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct swr_mstr_ctrl *swrm = platform_get_drvdata(pdev);
	int ret = 0;
	struct swr_master *mstr = &swrm->master;
	struct swr_device *swr_dev;

	dev_dbg(dev, "%s: pm_runtime: resume, state:%d\n",
		__func__, swrm->state);
	mutex_lock(&swrm->reslock);
	if ((swrm->state == SWR_MSTR_PAUSE) ||
	    (swrm->state == SWR_MSTR_DOWN)) {
		if (swrm->state == SWR_MSTR_DOWN) {
			if (swrm_clk_request(swrm, true))
				goto exit;
		}
		list_for_each_entry(swr_dev, &mstr->devices, dev_list) {
			ret = swr_device_up(swr_dev);
			if (ret) {
				dev_err(dev,
					"%s: failed to wakeup swr dev %d\n",
					__func__, swr_dev->dev_num);
				swrm_clk_request(swrm, false);
				goto exit;
			}
		}
		swr_master_write(swrm, SWRM_COMP_SW_RESET, 0x01);
		swr_master_write(swrm, SWRM_COMP_SW_RESET, 0x01);
		swrm_master_init(swrm);
	}
exit:
	pm_runtime_set_autosuspend_delay(&pdev->dev, auto_suspend_timer);
	mutex_unlock(&swrm->reslock);
	return ret;
}

static int swrm_runtime_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct swr_mstr_ctrl *swrm = platform_get_drvdata(pdev);
	int ret = 0;
	struct swr_master *mstr = &swrm->master;
	struct swr_device *swr_dev;
	int current_state = 0;

	dev_dbg(dev, "%s: pm_runtime: suspend state: %d\n",
		__func__, swrm->state);
	mutex_lock(&swrm->reslock);
	mutex_lock(&swrm->force_down_lock);
	current_state = swrm->state;
	mutex_unlock(&swrm->force_down_lock);
	if ((current_state == SWR_MSTR_RESUME) ||
	    (current_state == SWR_MSTR_UP) ||
	    (current_state == SWR_MSTR_SSR)) {

		if ((current_state != SWR_MSTR_SSR) &&
			swrm_is_port_en(&swrm->master)) {
			dev_dbg(dev, "%s ports are enabled\n", __func__);
			ret = -EBUSY;
			goto exit;
		}
		swrm_clk_pause(swrm);
		swr_master_write(swrm, SWRM_COMP_CFG_ADDR, 0x00);
		list_for_each_entry(swr_dev, &mstr->devices, dev_list) {
			ret = swr_device_down(swr_dev);
			if (ret) {
				dev_err(dev,
					"%s: failed to shutdown swr dev %d\n",
					__func__, swr_dev->dev_num);
				goto exit;
			}
		}
		swrm_clk_request(swrm, false);
	}
exit:
	mutex_unlock(&swrm->reslock);
	return ret;
}
#endif /* CONFIG_PM */

static int swrm_device_down(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct swr_mstr_ctrl *swrm = platform_get_drvdata(pdev);
	int ret = 0;

	dev_dbg(dev, "%s: swrm state: %d\n", __func__, swrm->state);

	mutex_lock(&swrm->force_down_lock);
	swrm->state = SWR_MSTR_SSR;
	mutex_unlock(&swrm->force_down_lock);
	/* Use pm runtime function to tear down */
	ret = pm_runtime_put_sync_suspend(dev);
	pm_runtime_get_noresume(dev);

	return ret;
}

/**
 * swrm_wcd_notify - parent device can notify to soundwire master through
 * this function
 * @pdev: pointer to platform device structure
 * @id: command id from parent to the soundwire master
 * @data: data from parent device to soundwire master
 */
int swrm_wcd_notify(struct platform_device *pdev, u32 id, void *data)
{
	struct swr_mstr_ctrl *swrm;
	int ret = 0;
	struct swr_master *mstr;
	struct swr_device *swr_dev;

	if (!pdev) {
		pr_err("%s: pdev is NULL\n", __func__);
		return -EINVAL;
	}
	swrm = platform_get_drvdata(pdev);
	if (!swrm) {
		dev_err(&pdev->dev, "%s: swrm is NULL\n", __func__);
		return -EINVAL;
	}
	mstr = &swrm->master;

	switch (id) {
	case SWR_DEVICE_DOWN:
		dev_dbg(swrm->dev, "%s: swr master down called\n", __func__);
		mutex_lock(&swrm->mlock);
		if ((swrm->state == SWR_MSTR_PAUSE) ||
		    (swrm->state == SWR_MSTR_DOWN))
			dev_dbg(swrm->dev, "%s:SWR master is already Down:%d\n",
				__func__, swrm->state);
		else
			swrm_device_down(&pdev->dev);
		mutex_unlock(&swrm->mlock);
		break;
	case SWR_DEVICE_UP:
		dev_dbg(swrm->dev, "%s: swr master up called\n", __func__);
		mutex_lock(&swrm->mlock);
		mutex_lock(&swrm->reslock);
		if ((swrm->state == SWR_MSTR_RESUME) ||
		    (swrm->state == SWR_MSTR_UP)) {
			dev_dbg(swrm->dev, "%s: SWR master is already UP: %d\n",
				__func__, swrm->state);
		} else {
			pm_runtime_mark_last_busy(&pdev->dev);
			mutex_unlock(&swrm->reslock);
			pm_runtime_get_sync(&pdev->dev);
			mutex_lock(&swrm->reslock);
			list_for_each_entry(swr_dev, &mstr->devices, dev_list) {
				ret = swr_reset_device(swr_dev);
				if (ret) {
					dev_err(swrm->dev,
						"%s: failed to reset swr device %d\n",
						__func__, swr_dev->dev_num);
					swrm_clk_request(swrm, false);
				}
			}
			pm_runtime_mark_last_busy(&pdev->dev);
			pm_runtime_put_autosuspend(&pdev->dev);
		}
		mutex_unlock(&swrm->reslock);
		mutex_unlock(&swrm->mlock);
		break;
	case SWR_SET_NUM_RX_CH:
		if (!data) {
			dev_err(swrm->dev, "%s: data is NULL\n", __func__);
			ret = -EINVAL;
		} else {
			mutex_lock(&swrm->mlock);
			swrm->num_rx_chs = *(int *)data;
			if ((swrm->num_rx_chs > 1) && !swrm->num_cfg_devs) {
				list_for_each_entry(swr_dev, &mstr->devices,
						    dev_list) {
					ret = swr_set_device_group(swr_dev,
								SWR_BROADCAST);
					if (ret)
						dev_err(swrm->dev,
							"%s: set num ch failed\n",
							__func__);
				}
			} else {
				list_for_each_entry(swr_dev, &mstr->devices,
						    dev_list) {
					ret = swr_set_device_group(swr_dev,
								SWR_GROUP_NONE);
					if (ret)
						dev_err(swrm->dev,
							"%s: set num ch failed\n",
							__func__);
				}
			}
			mutex_unlock(&swrm->mlock);
		}
		break;
	default:
		dev_err(swrm->dev, "%s: swr master unknown id %d\n",
			__func__, id);
		break;
	}
	return ret;
}
EXPORT_SYMBOL(swrm_wcd_notify);

#ifdef CONFIG_PM_SLEEP
static int swrm_suspend(struct device *dev)
{
	int ret = -EBUSY;
	struct platform_device *pdev = to_platform_device(dev);
	struct swr_mstr_ctrl *swrm = platform_get_drvdata(pdev);

	dev_dbg(dev, "%s: system suspend, state: %d\n", __func__, swrm->state);
	if (!pm_runtime_enabled(dev) || !pm_runtime_suspended(dev)) {
		ret = swrm_runtime_suspend(dev);
		if (!ret) {
			/*
			 * Synchronize runtime-pm and system-pm states:
			 * At this point, we are already suspended. If
			 * runtime-pm still thinks its active, then
			 * make sure its status is in sync with HW
			 * status. The three below calls let the
			 * runtime-pm know that we are suspended
			 * already without re-invoking the suspend
			 * callback
			 */
			pm_runtime_disable(dev);
			pm_runtime_set_suspended(dev);
			pm_runtime_enable(dev);
		}
	}
	if (ret == -EBUSY) {
		/*
		 * There is a possibility that some audio stream is active
		 * during suspend. We dont want to return suspend failure in
		 * that case so that display and relevant components can still
		 * go to suspend.
		 * If there is some other error, then it should be passed-on
		 * to system level suspend
		 */
		ret = 0;
	}
	return ret;
}

static int swrm_resume(struct device *dev)
{
	int ret = 0;
	struct platform_device *pdev = to_platform_device(dev);
	struct swr_mstr_ctrl *swrm = platform_get_drvdata(pdev);

	dev_dbg(dev, "%s: system resume, state: %d\n", __func__, swrm->state);
	if (!pm_runtime_enabled(dev) || !pm_runtime_suspend(dev)) {
		ret = swrm_runtime_resume(dev);
		if (!ret) {
			pm_runtime_mark_last_busy(dev);
			pm_request_autosuspend(dev);
		}
	}
	return ret;
}
#endif /* CONFIG_PM_SLEEP */

static const struct dev_pm_ops swrm_dev_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(
		swrm_suspend,
		swrm_resume
	)
	SET_RUNTIME_PM_OPS(
		swrm_runtime_suspend,
		swrm_runtime_resume,
		NULL
	)
};

static const struct of_device_id swrm_dt_match[] = {
	{
		.compatible = "qcom,swr-mstr",
	},
	{}
};

static struct platform_driver swr_mstr_driver = {
	.probe = swrm_probe,
	.remove = swrm_remove,
	.driver = {
		.name = SWR_WCD_NAME,
		.owner = THIS_MODULE,
		.pm = &swrm_dev_pm_ops,
		.of_match_table = swrm_dt_match,
	},
};

static int __init swrm_init(void)
{
	return platform_driver_register(&swr_mstr_driver);
}
module_init(swrm_init);

static void __exit swrm_exit(void)
{
	platform_driver_unregister(&swr_mstr_driver);
}
module_exit(swrm_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("SoundWire Master Controller");
MODULE_ALIAS("platform:swr-mstr");