text: /* Copyright (c) 2012-2017, 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/slab.h>
  #include <linux/mutex.h>
  #include <linux/mfd/wcd9xxx/wcd9xxx_registers.h>
  #include "wcd9xxx-slimslave.h"
  
  struct wcd9xxx_slim_sch {
  	u16 rx_port_ch_reg_base;
  	u16 port_tx_cfg_reg_base;
  	u16 port_rx_cfg_reg_base;
  };
  
  static struct wcd9xxx_slim_sch sh_ch;
  
  static int wcd9xxx_alloc_slim_sh_ch(struct wcd9xxx *wcd9xxx,
  				    u8 wcd9xxx_pgd_la, u32 cnt,
  				    struct wcd9xxx_ch *channels, u32 path);
  
  static int wcd9xxx_dealloc_slim_sh_ch(struct slim_device *slim,
  				      u32 cnt, struct wcd9xxx_ch *channels);
  
  static int wcd9xxx_configure_ports(struct wcd9xxx *wcd9xxx)
  {
  	if (wcd9xxx->codec_type->slim_slave_type ==
  	    WCD9XXX_SLIM_SLAVE_ADDR_TYPE_0) {
  		sh_ch.rx_port_ch_reg_base = 0x180;
  		sh_ch.port_rx_cfg_reg_base = 0x040;
  		sh_ch.port_tx_cfg_reg_base = 0x040;
  	} else {
  		sh_ch.rx_port_ch_reg_base =
  			0x180 - (TAIKO_SB_PGD_OFFSET_OF_RX_SLAVE_DEV_PORTS * 4);
  		sh_ch.port_rx_cfg_reg_base =
  			0x040 - TAIKO_SB_PGD_OFFSET_OF_RX_SLAVE_DEV_PORTS;
  		sh_ch.port_tx_cfg_reg_base = 0x050;
  	}
  
  	return 0;
  }
  
  /**
   * wcd9xxx_init_slimslave
   *
   * @wcd9xxx: pointer to wcd9xxx struct
   * @wcd9xxx_pgd_la: pgd_la value
   * @tx_num: tx number
   * @rx_num: rx number
   * @tx_slot: pointer to tx slot
   * @rx_slot: pointer to rx slot
   *
   * Returns 0 on success, appropriate error code otherwise
   */
  int wcd9xxx_init_slimslave(struct wcd9xxx *wcd9xxx, u8 wcd9xxx_pgd_la,
  			   unsigned int tx_num, unsigned int *tx_slot,
  			   unsigned int rx_num, unsigned int *rx_slot)
  {
  	int ret = 0;
  	int i;
  
  	ret = wcd9xxx_configure_ports(wcd9xxx);
  	if (ret) {
  		pr_err("%s: Failed to configure register address offset\n",
  		       __func__);
  		goto err;
  	}
  
  	if (!rx_num || rx_num > wcd9xxx->num_rx_port) {
  		pr_err("%s: invalid rx num %d\n", __func__, rx_num);
  		return -EINVAL;
  	}
  	if (wcd9xxx->rx_chs) {
  		wcd9xxx->num_rx_port = rx_num;
  		for (i = 0; i < rx_num; i++) {
  			wcd9xxx->rx_chs[i].ch_num = rx_slot[i];
  			INIT_LIST_HEAD(&wcd9xxx->rx_chs[i].list);
  		}
  		ret = wcd9xxx_alloc_slim_sh_ch(wcd9xxx, wcd9xxx_pgd_la,
  						wcd9xxx->num_rx_port,
  						wcd9xxx->rx_chs,
  						SLIM_SINK);
  		if (ret) {
  			pr_err("%s: Failed to alloc %d rx slimbus channels\n",
  				__func__, wcd9xxx->num_rx_port);
  			kfree(wcd9xxx->rx_chs);
  			wcd9xxx->rx_chs = NULL;
  			wcd9xxx->num_rx_port = 0;
  		}
  	} else {
  		pr_err("Not able to allocate memory for %d slimbus rx ports\n",
  			wcd9xxx->num_rx_port);
  	}
  
  	if (!tx_num || tx_num > wcd9xxx->num_tx_port) {
  		pr_err("%s: invalid tx num %d\n", __func__, tx_num);
  		return -EINVAL;
  	}
  	if (wcd9xxx->tx_chs) {
  		wcd9xxx->num_tx_port = tx_num;
  		for (i = 0; i < tx_num; i++) {
  			wcd9xxx->tx_chs[i].ch_num = tx_slot[i];
  			INIT_LIST_HEAD(&wcd9xxx->tx_chs[i].list);
  		}
  		ret = wcd9xxx_alloc_slim_sh_ch(wcd9xxx, wcd9xxx_pgd_la,
  						wcd9xxx->num_tx_port,
  						wcd9xxx->tx_chs,
  						SLIM_SRC);
  		if (ret) {
  			pr_err("%s: Failed to alloc %d tx slimbus channels\n",
  				__func__, wcd9xxx->num_tx_port);
  			kfree(wcd9xxx->tx_chs);
  			wcd9xxx->tx_chs = NULL;
  			wcd9xxx->num_tx_port = 0;
  		}
  	} else {
  		pr_err("Not able to allocate memory for %d slimbus tx ports\n",
  			wcd9xxx->num_tx_port);
  	}
  	return 0;
  err:
  	return ret;
  }
  EXPORT_SYMBOL(wcd9xxx_init_slimslave);
  
  int wcd9xxx_deinit_slimslave(struct wcd9xxx *wcd9xxx)
  {
  	if (wcd9xxx->num_rx_port) {
  		wcd9xxx_dealloc_slim_sh_ch(wcd9xxx->slim,
  					wcd9xxx->num_rx_port,
  					wcd9xxx->rx_chs);
  		wcd9xxx->num_rx_port = 0;
  	}
  	if (wcd9xxx->num_tx_port) {
  		wcd9xxx_dealloc_slim_sh_ch(wcd9xxx->slim,
  					wcd9xxx->num_tx_port,
  					wcd9xxx->tx_chs);
  		wcd9xxx->num_tx_port = 0;
  	}
  	return 0;
  }
  
  
  static int wcd9xxx_alloc_slim_sh_ch(struct wcd9xxx *wcd9xxx,
  				    u8 wcd9xxx_pgd_la, u32 cnt,
  				    struct wcd9xxx_ch *channels, u32 path)
  {
  	int ret = 0;
  	u32 ch_idx;
  
  	/* The slimbus channel allocation seem take longer time
  	 * so do the allocation up front to avoid delay in start of
  	 * playback
  	 */
  	pr_debug("%s: pgd_la[%d]\n", __func__, wcd9xxx_pgd_la);
  	for (ch_idx = 0; ch_idx < cnt; ch_idx++) {
  		ret = slim_get_slaveport(wcd9xxx_pgd_la,
  					channels[ch_idx].port,
  					&channels[ch_idx].sph, path);
  		pr_debug("%s: pgd_la[%d] channels[%d].port[%d]\n"
  			"channels[%d].sph[%d] path[%d]\n",
  			__func__, wcd9xxx_pgd_la, ch_idx,
  			channels[ch_idx].port,
  			ch_idx, channels[ch_idx].sph, path);
  		if (ret < 0) {
  			pr_err("%s: slave port failure id[%d] ret[%d]\n",
  				__func__, channels[ch_idx].ch_num, ret);
  			goto err;
  		}
  
  		ret = slim_query_ch(wcd9xxx->slim,
  				    channels[ch_idx].ch_num,
  				    &channels[ch_idx].ch_h);
  		if (ret < 0) {
  			pr_err("%s: slim_query_ch failed ch-num[%d] ret[%d]\n",
  				__func__, channels[ch_idx].ch_num, ret);
  			goto err;
  		}
  	}
  err:
  	return ret;
  }
  
  static int wcd9xxx_dealloc_slim_sh_ch(struct slim_device *slim,
  			u32 cnt, struct wcd9xxx_ch *channels)
  {
  	int idx = 0;
  	int ret = 0;
  	/* slim_dealloc_ch */
  	for (idx = 0; idx < cnt; idx++) {
  		ret = slim_dealloc_ch(slim, channels[idx].ch_h);
  		if (ret < 0) {
  			pr_err("%s: slim_dealloc_ch fail ret[%d] ch_h[%d]\n",
  				__func__, ret, channels[idx].ch_h);
  		}
  	}
  	return ret;
  }
  
  /* Enable slimbus slave device for RX path */
  int wcd9xxx_cfg_slim_sch_rx(struct wcd9xxx *wcd9xxx,
  			    struct list_head *wcd9xxx_ch_list,
  			    unsigned int rate, unsigned int bit_width,
  			    u16 *grph)
  {
  	u8 ch_cnt = 0;
  	u16 ch_h[SLIM_MAX_RX_PORTS] = {0};
  	u8  payload = 0;
  	u16 codec_port = 0;
  	int ret;
  	struct slim_ch prop;
  	struct wcd9xxx_ch *rx;
  	int size = ARRAY_SIZE(ch_h);
  
  	/* Configure slave interface device */
  
  	list_for_each_entry(rx, wcd9xxx_ch_list, list) {
  		payload |= 1 << rx->shift;
  		if (ch_cnt < size) {
  			ch_h[ch_cnt] = rx->ch_h;
  			ch_cnt++;
  			pr_debug("list ch->ch_h %d ch->sph %d\n",
  				 rx->ch_h, rx->sph);
  		} else {
  			pr_err("%s: allocated channel number %u is out of max rangae %d\n",
  			       __func__, ch_cnt,
  			       size);
  			ret = EINVAL;
  			goto err;
  		}
  	}
  	pr_debug("%s: ch_cnt[%d] rate=%d WATER_MARK_VAL %d\n",
  		 __func__, ch_cnt, rate, WATER_MARK_VAL);
  	/* slim_define_ch api */
  	prop.prot = SLIM_AUTO_ISO;
  	if ((rate == 44100) || (rate == 88200) || (rate == 176400) ||
  	    (rate == 352800)) {
  		prop.baser = SLIM_RATE_11025HZ;
  		prop.ratem = (rate/11025);
  	} else {
  		prop.baser = SLIM_RATE_4000HZ;
  		prop.ratem = (rate/4000);
  	}
  	prop.dataf = SLIM_CH_DATAF_NOT_DEFINED;
  	prop.auxf = SLIM_CH_AUXF_NOT_APPLICABLE;
  	prop.sampleszbits = bit_width;
  
  	pr_debug("Before slim_define_ch:\n"
  		 "ch_cnt %d,ch_h[0] %d ch_h[1] %d, grph %d\n",
  		 ch_cnt, ch_h[0], ch_h[1], *grph);
  	ret = slim_define_ch(wcd9xxx->slim, &prop, ch_h, ch_cnt,
  			     true, grph);
  	if (ret < 0) {
  		pr_err("%s: slim_define_ch failed ret[%d]\n",
  		       __func__, ret);
  		goto err;
  	}
  
  	list_for_each_entry(rx, wcd9xxx_ch_list, list) {
  		codec_port = rx->port;
  		pr_debug("%s: codec_port %d rx 0x%p, payload %d\n"
  			 "sh_ch.rx_port_ch_reg_base0 0x%x\n"
  			 "sh_ch.port_rx_cfg_reg_base 0x%x\n",
  			 __func__, codec_port, rx, payload,
  			 sh_ch.rx_port_ch_reg_base,
  			sh_ch.port_rx_cfg_reg_base);
  
  		/* look for the valid port range and chose the
  		 * payload accordingly
  		 */
  		/* write to interface device */
  		ret = wcd9xxx_interface_reg_write(wcd9xxx,
  				SB_PGD_RX_PORT_MULTI_CHANNEL_0(
  				sh_ch.rx_port_ch_reg_base, codec_port),
  				payload);
  
  		if (ret < 0) {
  			pr_err("%s:Intf-dev fail reg[%d] payload[%d] ret[%d]\n",
  				__func__,
  				SB_PGD_RX_PORT_MULTI_CHANNEL_0(
  				sh_ch.rx_port_ch_reg_base, codec_port),
  				payload, ret);
  			goto err;
  		}
  		/* configure the slave port for water mark and enable*/
  		ret = wcd9xxx_interface_reg_write(wcd9xxx,
  				SB_PGD_PORT_CFG_BYTE_ADDR(
  				sh_ch.port_rx_cfg_reg_base, codec_port),
  				WATER_MARK_VAL);
  		if (ret < 0) {
  			pr_err("%s:watermark set failure for port[%d] ret[%d]",
  				__func__, codec_port, ret);
  		}
  
  		ret = slim_connect_sink(wcd9xxx->slim, &rx->sph, 1, rx->ch_h);
  		if (ret < 0) {
  			pr_err("%s: slim_connect_sink failed ret[%d]\n",
  				__func__, ret);
  			goto err_close_slim_sch;
  		}
  	}
  	/* slim_control_ch */
  	ret = slim_control_ch(wcd9xxx->slim, *grph, SLIM_CH_ACTIVATE,
  			      true);
  	if (ret < 0) {
  		pr_err("%s: slim_control_ch failed ret[%d]\n",
  			__func__, ret);
  		goto err_close_slim_sch;
  	}
  	return 0;
  
  err_close_slim_sch:
  	/*  release all acquired handles */
  	wcd9xxx_close_slim_sch_rx(wcd9xxx, wcd9xxx_ch_list, *grph);
  err:
  	return ret;
  }
  EXPORT_SYMBOL(wcd9xxx_cfg_slim_sch_rx);
  
  /* Enable slimbus slave device for RX path */
  int wcd9xxx_cfg_slim_sch_tx(struct wcd9xxx *wcd9xxx,
  			    struct list_head *wcd9xxx_ch_list,
  			    unsigned int rate, unsigned int bit_width,
  			    u16 *grph)
  {
  	u16 ch_cnt = 0;
  	u16 payload = 0;
  	u16 ch_h[SLIM_MAX_TX_PORTS] = {0};
  	u16 codec_port;
  	int ret = 0;
  	struct wcd9xxx_ch *tx;
  	int size = ARRAY_SIZE(ch_h);
  
  	struct slim_ch prop;
  
  	list_for_each_entry(tx, wcd9xxx_ch_list, list) {
  		payload |= 1 << tx->shift;
  		if (ch_cnt < size) {
  			ch_h[ch_cnt] = tx->ch_h;
  			ch_cnt++;
  		} else {
  			pr_err("%s: allocated channel number %u is out of max rangae %d\n",
  			       __func__, ch_cnt,
  			       size);
  			ret = EINVAL;
  			goto err;
  		}
  	}
  
  	/* slim_define_ch api */
  	prop.prot = SLIM_AUTO_ISO;
  	prop.baser = SLIM_RATE_4000HZ;
  	prop.dataf = SLIM_CH_DATAF_NOT_DEFINED;
  	prop.auxf = SLIM_CH_AUXF_NOT_APPLICABLE;
  	prop.ratem = (rate/4000);
  	prop.sampleszbits = bit_width;
  	ret = slim_define_ch(wcd9xxx->slim, &prop, ch_h, ch_cnt,
  			     true, grph);
  	if (ret < 0) {
  		pr_err("%s: slim_define_ch failed ret[%d]\n",
  		       __func__, ret);
  		goto err;
  	}
  
  	pr_debug("%s: ch_cnt[%d] rate[%d] bitwidth[%u]\n", __func__, ch_cnt,
  		 rate, bit_width);
  	list_for_each_entry(tx, wcd9xxx_ch_list, list) {
  		codec_port = tx->port;
  		pr_debug("%s: codec_port %d tx 0x%p, payload 0x%x\n",
  			 __func__, codec_port, tx, payload);
  		/* write to interface device */
  		ret = wcd9xxx_interface_reg_write(wcd9xxx,
  				SB_PGD_TX_PORT_MULTI_CHANNEL_0(codec_port),
  				payload & 0x00FF);
  		if (ret < 0) {
  			pr_err("%s:Intf-dev fail reg[%d] payload[%d] ret[%d]\n",
  				__func__,
  				SB_PGD_TX_PORT_MULTI_CHANNEL_0(codec_port),
  				payload, ret);
  			goto err;
  		}
  		/* ports 8,9 */
  		ret = wcd9xxx_interface_reg_write(wcd9xxx,
  				SB_PGD_TX_PORT_MULTI_CHANNEL_1(codec_port),
  				(payload & 0xFF00)>>8);
  		if (ret < 0) {
  			pr_err("%s:Intf-dev fail reg[%d] payload[%d] ret[%d]\n",
  				__func__,
  				SB_PGD_TX_PORT_MULTI_CHANNEL_1(codec_port),
  				payload, ret);
  			goto err;
  		}
  		/* configure the slave port for water mark and enable*/
  		ret = wcd9xxx_interface_reg_write(wcd9xxx,
  				SB_PGD_PORT_CFG_BYTE_ADDR(
  				sh_ch.port_tx_cfg_reg_base, codec_port),
  				WATER_MARK_VAL);
  		if (ret < 0) {
  			pr_err("%s:watermark set failure for port[%d] ret[%d]",
  				__func__, codec_port, ret);
  		}
  
  		ret = slim_connect_src(wcd9xxx->slim, tx->sph, tx->ch_h);
  
  		if (ret < 0) {
  			pr_err("%s: slim_connect_src failed ret[%d]\n",
  			       __func__, ret);
  			goto err;
  		}
  	}
  	/* slim_control_ch */
  	ret = slim_control_ch(wcd9xxx->slim, *grph, SLIM_CH_ACTIVATE,
  			      true);
  	if (ret < 0) {
  		pr_err("%s: slim_control_ch failed ret[%d]\n",
  			__func__, ret);
  		goto err;
  	}
  	return 0;
  err:
  	/* release all acquired handles */
  	wcd9xxx_close_slim_sch_tx(wcd9xxx, wcd9xxx_ch_list, *grph);
  	return ret;
  }
  EXPORT_SYMBOL(wcd9xxx_cfg_slim_sch_tx);
  
  int wcd9xxx_close_slim_sch_rx(struct wcd9xxx *wcd9xxx,
  			      struct list_head *wcd9xxx_ch_list, u16 grph)
  {
  	u32 sph[SLIM_MAX_RX_PORTS] = {0};
  	int ch_cnt = 0;
  	int ret = 0;
  	struct wcd9xxx_ch *rx;
  
  	list_for_each_entry(rx, wcd9xxx_ch_list, list)
  		sph[ch_cnt++] = rx->sph;
  
  	pr_debug("%s ch_cht %d, sph[0] %d sph[1] %d\n", __func__, ch_cnt,
  		sph[0], sph[1]);
  
  	/* slim_control_ch (REMOVE) */
  	pr_debug("%s before slim_control_ch grph %d\n", __func__, grph);
  	ret = slim_control_ch(wcd9xxx->slim, grph, SLIM_CH_REMOVE, true);
  	if (ret < 0) {
  		pr_err("%s: slim_control_ch failed ret[%d]\n", __func__, ret);
  		goto err;
  	}
  err:
  	return ret;
  }
  EXPORT_SYMBOL(wcd9xxx_close_slim_sch_rx);
  
  int wcd9xxx_close_slim_sch_tx(struct wcd9xxx *wcd9xxx,
  			      struct list_head *wcd9xxx_ch_list,
  			      u16 grph)
  {
  	u32 sph[SLIM_MAX_TX_PORTS] = {0};
  	int ret = 0;
  	int ch_cnt = 0;
  	struct wcd9xxx_ch *tx;
  
  	pr_debug("%s\n", __func__);
  	list_for_each_entry(tx, wcd9xxx_ch_list, list)
  		sph[ch_cnt++] = tx->sph;
  
  	pr_debug("%s ch_cht %d, sph[0] %d sph[1] %d\n",
  		__func__, ch_cnt, sph[0], sph[1]);
  	/* slim_control_ch (REMOVE) */
  	ret = slim_control_ch(wcd9xxx->slim, grph, SLIM_CH_REMOVE, true);
  	if (ret < 0) {
  		pr_err("%s: slim_control_ch failed ret[%d]\n",
  			__func__, ret);
  		goto err;
  	}
  err:
  	return ret;
  }
  EXPORT_SYMBOL(wcd9xxx_close_slim_sch_tx);
  
  int wcd9xxx_get_slave_port(unsigned int ch_num)
  {
  	int ret = 0;
  
  	ret = (ch_num - BASE_CH_NUM);
  	pr_debug("%s: ch_num[%d] slave port[%d]\n", __func__, ch_num, ret);
  	if (ret < 0) {
  		pr_err("%s: Error:- Invalid slave port found = %d\n",
  			__func__, ret);
  		return -EINVAL;
  	}
  	return ret;
  }
  EXPORT_SYMBOL(wcd9xxx_get_slave_port);
  
  int wcd9xxx_disconnect_port(struct wcd9xxx *wcd9xxx,
  			    struct list_head *wcd9xxx_ch_list, u16 grph)
  {
  	u32 sph[SLIM_MAX_TX_PORTS + SLIM_MAX_RX_PORTS] = {0};
  	int ch_cnt = 0;
  	int ret = 0;
  	struct wcd9xxx_ch *slim_ch;
  
  	list_for_each_entry(slim_ch, wcd9xxx_ch_list, list)
  		sph[ch_cnt++] = slim_ch->sph;
  
  	/* slim_disconnect_port */
  	ret = slim_disconnect_ports(wcd9xxx->slim, sph, ch_cnt);
  	if (ret < 0) {
  		pr_err("%s: slim_disconnect_ports failed ret[%d]\n",
  			__func__, ret);
  	}
  	return ret;
  }
  EXPORT_SYMBOL(wcd9xxx_disconnect_port);
  
  /* This function is called with mutex acquired */
  int wcd9xxx_rx_vport_validation(u32 port_id,
  				struct list_head *codec_dai_list)
  {
  	struct wcd9xxx_ch *ch;
  	int ret = 0;
  
  	pr_debug("%s: port_id %u\n", __func__, port_id);
  
  	list_for_each_entry(ch,
  		codec_dai_list, list) {
  		pr_debug("%s: ch->port %u\n", __func__, ch->port);
  		if (ch->port == port_id) {
  			ret = -EINVAL;
  			break;
  		}
  	}
  	return ret;
  }
  EXPORT_SYMBOL(wcd9xxx_rx_vport_validation);
  
  
  /* This function is called with mutex acquired */
  int wcd9xxx_tx_vport_validation(u32 table, u32 port_id,
  				struct wcd9xxx_codec_dai_data *codec_dai,
  				u32 num_codec_dais)
  {
  	struct wcd9xxx_ch *ch;
  	int ret = 0;
  	u32 index;
  	unsigned long vtable = table;
  	u32 size = sizeof(table) * BITS_PER_BYTE;
  
  	pr_debug("%s: vtable 0x%lx port_id %u size %d\n", __func__,
  		 vtable, port_id, size);
  	for_each_set_bit(index, &vtable, size) {
  		if (index < num_codec_dais) {
  			list_for_each_entry(ch,
  					&codec_dai[index].wcd9xxx_ch_list,
  					list) {
  				pr_debug("%s: index %u ch->port %u vtable 0x%lx\n",
  						__func__, index, ch->port,
  						vtable);
  				if (ch->port == port_id) {
  					pr_err("%s: TX%u is used by AIF%u_CAP Mixer\n",
  							__func__, port_id + 1,
  							(index + 1)/2);
  					ret = -EINVAL;
  					break;
  				}
  			}
  		} else {
  			pr_err("%s: Invalid index %d of codec dai",
  					__func__, index);
  			ret = -EINVAL;
  		}
  		if (ret)
  			break;
  	}
  	return ret;
  }
  EXPORT_SYMBOL(wcd9xxx_tx_vport_validation);
  