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c926b74605
scu.c cares SRU(Gen1) / SCU(Gen2) / SSIU(Gen2) Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Mark Brown <broonie@linaro.org>
468 lines
9.9 KiB
C
468 lines
9.9 KiB
C
/*
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* Renesas R-Car SCU support
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*
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* Copyright (C) 2013 Renesas Solutions Corp.
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* Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include "rsnd.h"
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struct rsnd_scu {
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struct rsnd_scu_platform_info *info; /* rcar_snd.h */
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struct rsnd_mod mod;
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struct clk *clk;
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};
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#define rsnd_scu_mode_flags(p) ((p)->info->flags)
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#define rsnd_scu_convert_rate(p) ((p)->info->convert_rate)
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#define RSND_SCU_NAME_SIZE 16
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/*
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* ADINR
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*/
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#define OTBL_24 (0 << 16)
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#define OTBL_22 (2 << 16)
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#define OTBL_20 (4 << 16)
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#define OTBL_18 (6 << 16)
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#define OTBL_16 (8 << 16)
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/*
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* image of SRC (Sampling Rate Converter)
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*
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* 96kHz <-> +-----+ 48kHz +-----+ 48kHz +-------+
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* 48kHz <-> | SRC | <------> | SSI | <-----> | codec |
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* 44.1kHz <-> +-----+ +-----+ +-------+
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* ...
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*
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*/
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/*
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* scu.c is caring...
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*
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* Gen1
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*
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* [mem] -> [SRU] -> [SSI]
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* |--------|
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*
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* Gen2
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*
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* [mem] -> [SCU] -> [SSIU] -> [SSI]
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* |-----------------|
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*/
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/*
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* How to use SRC bypass mode for debugging
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*
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* SRC has bypass mode, and it is useful for debugging.
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* In Gen2 case,
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* SRCm_MODE controls whether SRC is used or not
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* SSI_MODE0 controls whether SSIU which receives SRC data
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* is used or not.
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* Both SRCm_MODE/SSI_MODE0 settings are needed if you use SRC,
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* but SRC bypass mode needs SSI_MODE0 only.
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*
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* This driver request
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* struct rsnd_scu_platform_info {
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* u32 flags;
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* u32 convert_rate;
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* }
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*
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* rsnd_scu_hpbif_is_enable() will be true
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* if flags had RSND_SCU_USE_HPBIF,
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* and it controls whether SSIU is used or not.
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*
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* rsnd_scu_convert_rate() indicates
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* above convert_rate, and it controls
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* whether SRC is used or not.
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*
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* ex) doesn't use SRC
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* struct rsnd_scu_platform_info info = {
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* .flags = 0,
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* .convert_rate = 0,
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* };
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*
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* ex) uses SRC
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* struct rsnd_scu_platform_info info = {
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* .flags = RSND_SCU_USE_HPBIF,
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* .convert_rate = 48000,
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* };
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*
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* ex) uses SRC bypass mode
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* struct rsnd_scu_platform_info info = {
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* .flags = RSND_SCU_USE_HPBIF,
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* .convert_rate = 0,
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* };
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*
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*/
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#define rsnd_mod_to_scu(_mod) \
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container_of((_mod), struct rsnd_scu, mod)
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#define for_each_rsnd_scu(pos, priv, i) \
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for ((i) = 0; \
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((i) < rsnd_scu_nr(priv)) && \
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((pos) = (struct rsnd_scu *)(priv)->scu + i); \
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i++)
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static int rsnd_scu_ssi_mode_init(struct rsnd_mod *mod,
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struct rsnd_dai *rdai,
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struct rsnd_dai_stream *io)
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{
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struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
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int id = rsnd_mod_id(mod);
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/*
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* SSI_MODE0
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*/
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rsnd_mod_bset(mod, SSI_MODE0, (1 << id),
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rsnd_scu_hpbif_is_enable(mod) ? 0 : (1 << id));
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/*
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* SSI_MODE1
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*/
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if (rsnd_ssi_is_pin_sharing(rsnd_ssi_mod_get(priv, id))) {
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int shift = -1;
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switch (id) {
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case 1:
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shift = 0;
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break;
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case 2:
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shift = 2;
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break;
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case 4:
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shift = 16;
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break;
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}
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if (shift >= 0)
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rsnd_mod_bset(mod, SSI_MODE1,
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0x3 << shift,
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rsnd_dai_is_clk_master(rdai) ?
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0x2 << shift : 0x1 << shift);
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}
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return 0;
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}
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/* Gen1 only */
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static int rsnd_src_set_route_if_gen1(
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struct rsnd_mod *mod,
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struct rsnd_dai *rdai,
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struct rsnd_dai_stream *io)
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{
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struct scu_route_config {
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u32 mask;
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int shift;
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} routes[] = {
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{ 0xF, 0, }, /* 0 */
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{ 0xF, 4, }, /* 1 */
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{ 0xF, 8, }, /* 2 */
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{ 0x7, 12, }, /* 3 */
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{ 0x7, 16, }, /* 4 */
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{ 0x7, 20, }, /* 5 */
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{ 0x7, 24, }, /* 6 */
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{ 0x3, 28, }, /* 7 */
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{ 0x3, 30, }, /* 8 */
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};
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struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
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struct rsnd_scu *scu = rsnd_mod_to_scu(mod);
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u32 mask;
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u32 val;
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int shift;
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int id;
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/*
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* Gen1 only
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*/
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if (!rsnd_is_gen1(priv))
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return 0;
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id = rsnd_mod_id(mod);
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if (id < 0 || id >= ARRAY_SIZE(routes))
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return -EIO;
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/*
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* SRC_ROUTE_SELECT
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*/
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val = rsnd_dai_is_play(rdai, io) ? 0x1 : 0x2;
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val = val << routes[id].shift;
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mask = routes[id].mask << routes[id].shift;
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rsnd_mod_bset(mod, SRC_ROUTE_SEL, mask, val);
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/*
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* SRC_TIMING_SELECT
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*/
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shift = (id % 4) * 8;
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mask = 0x1F << shift;
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/*
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* ADG is used as source clock if SRC was used,
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* then, SSI WS is used as destination clock.
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* SSI WS is used as source clock if SRC is not used
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* (when playback, source/destination become reverse when capture)
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*/
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if (rsnd_scu_convert_rate(scu)) /* use ADG */
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val = 0;
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else if (8 == id) /* use SSI WS, but SRU8 is special */
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val = id << shift;
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else /* use SSI WS */
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val = (id + 1) << shift;
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switch (id / 4) {
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case 0:
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rsnd_mod_bset(mod, SRC_TMG_SEL0, mask, val);
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break;
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case 1:
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rsnd_mod_bset(mod, SRC_TMG_SEL1, mask, val);
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break;
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case 2:
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rsnd_mod_bset(mod, SRC_TMG_SEL2, mask, val);
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break;
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}
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return 0;
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}
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unsigned int rsnd_scu_get_ssi_rate(struct rsnd_priv *priv,
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struct rsnd_mod *ssi_mod,
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struct snd_pcm_runtime *runtime)
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{
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struct rsnd_scu *scu;
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unsigned int rate;
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/* this function is assuming SSI id = SCU id here */
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scu = rsnd_mod_to_scu(rsnd_scu_mod_get(priv, rsnd_mod_id(ssi_mod)));
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/*
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* return convert rate if SRC is used,
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* otherwise, return runtime->rate as usual
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*/
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rate = rsnd_scu_convert_rate(scu);
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if (!rate)
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rate = runtime->rate;
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return rate;
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}
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static int rsnd_scu_set_convert_rate(struct rsnd_mod *mod,
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struct rsnd_dai *rdai,
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struct rsnd_dai_stream *io)
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{
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struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
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struct snd_pcm_runtime *runtime = rsnd_io_to_runtime(io);
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struct rsnd_scu *scu = rsnd_mod_to_scu(mod);
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u32 convert_rate = rsnd_scu_convert_rate(scu);
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u32 adinr = runtime->channels;
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/* set/clear soft reset */
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rsnd_mod_write(mod, SRC_SWRSR, 0);
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rsnd_mod_write(mod, SRC_SWRSR, 1);
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/* Initialize the operation of the SRC internal circuits */
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rsnd_mod_write(mod, SRC_SRCIR, 1);
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/* Set channel number and output bit length */
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switch (runtime->sample_bits) {
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case 16:
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adinr |= OTBL_16;
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break;
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case 32:
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adinr |= OTBL_24;
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break;
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default:
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return -EIO;
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}
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rsnd_mod_write(mod, SRC_ADINR, adinr);
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if (convert_rate) {
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u32 fsrate = 0x0400000 / convert_rate * runtime->rate;
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int ret;
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/* Enable the initial value of IFS */
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rsnd_mod_write(mod, SRC_IFSCR, 1);
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/* Set initial value of IFS */
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rsnd_mod_write(mod, SRC_IFSVR, fsrate);
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/* Select SRC mode (fixed value) */
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rsnd_mod_write(mod, SRC_SRCCR, 0x00010110);
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/* Set the restriction value of the FS ratio (98%) */
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rsnd_mod_write(mod, SRC_MNFSR, fsrate / 100 * 98);
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if (rsnd_is_gen1(priv)) {
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/* no SRC_BFSSR settings, since SRC_SRCCR::BUFMD is 0 */
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}
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/* set convert clock */
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ret = rsnd_adg_set_convert_clk(priv, mod,
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runtime->rate,
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convert_rate);
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if (ret < 0)
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return ret;
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}
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/* Cancel the initialization and operate the SRC function */
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rsnd_mod_write(mod, SRC_SRCIR, 0);
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/* use DMA transfer */
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rsnd_mod_write(mod, SRC_BUSIF_MODE, 1);
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return 0;
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}
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bool rsnd_scu_hpbif_is_enable(struct rsnd_mod *mod)
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{
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struct rsnd_scu *scu = rsnd_mod_to_scu(mod);
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u32 flags = rsnd_scu_mode_flags(scu);
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return !!(flags & RSND_SCU_USE_HPBIF);
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}
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static int rsnd_scu_init(struct rsnd_mod *mod,
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struct rsnd_dai *rdai,
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struct rsnd_dai_stream *io)
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{
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struct rsnd_scu *scu = rsnd_mod_to_scu(mod);
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int ret;
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clk_enable(scu->clk);
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ret = rsnd_scu_ssi_mode_init(mod, rdai, io);
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if (ret < 0)
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return ret;
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ret = rsnd_src_set_route_if_gen1(mod, rdai, io);
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if (ret < 0)
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return ret;
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ret = rsnd_scu_set_convert_rate(mod, rdai, io);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int rsnd_scu_quit(struct rsnd_mod *mod,
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struct rsnd_dai *rdai,
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struct rsnd_dai_stream *io)
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{
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struct rsnd_scu *scu = rsnd_mod_to_scu(mod);
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clk_disable(scu->clk);
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return 0;
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}
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static int rsnd_scu_start(struct rsnd_mod *mod,
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struct rsnd_dai *rdai,
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struct rsnd_dai_stream *io)
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{
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struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
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struct rsnd_scu *scu = rsnd_mod_to_scu(mod);
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int id = rsnd_mod_id(mod);
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if (rsnd_is_gen1(priv))
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rsnd_mod_bset(mod, SRC_ROUTE_CTRL, (1 << id), (1 << id));
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if (rsnd_scu_convert_rate(scu))
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rsnd_mod_write(mod, SRC_ROUTE_MODE0, 1);
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return 0;
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}
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static int rsnd_scu_stop(struct rsnd_mod *mod,
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struct rsnd_dai *rdai,
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struct rsnd_dai_stream *io)
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{
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struct rsnd_priv *priv = rsnd_mod_to_priv(mod);
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struct rsnd_scu *scu = rsnd_mod_to_scu(mod);
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int id = rsnd_mod_id(mod);
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if (rsnd_is_gen1(priv))
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rsnd_mod_bset(mod, SRC_ROUTE_CTRL, (1 << id), 0);
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if (rsnd_scu_convert_rate(scu))
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rsnd_mod_write(mod, SRC_ROUTE_MODE0, 0);
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return 0;
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}
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static struct rsnd_mod_ops rsnd_scu_ops = {
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.name = "scu",
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.init = rsnd_scu_init,
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.quit = rsnd_scu_quit,
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.start = rsnd_scu_start,
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.stop = rsnd_scu_stop,
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};
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static struct rsnd_mod_ops rsnd_scu_non_ops = {
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.name = "scu (non)",
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.init = rsnd_scu_ssi_mode_init,
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};
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struct rsnd_mod *rsnd_scu_mod_get(struct rsnd_priv *priv, int id)
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{
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if (WARN_ON(id < 0 || id >= rsnd_scu_nr(priv)))
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id = 0;
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return &((struct rsnd_scu *)(priv->scu) + id)->mod;
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}
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int rsnd_scu_probe(struct platform_device *pdev,
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struct rcar_snd_info *info,
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struct rsnd_priv *priv)
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{
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struct device *dev = rsnd_priv_to_dev(priv);
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struct rsnd_scu *scu;
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struct rsnd_mod_ops *ops;
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struct clk *clk;
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char name[RSND_SCU_NAME_SIZE];
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int i, nr;
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/*
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* init SCU
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*/
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nr = info->scu_info_nr;
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scu = devm_kzalloc(dev, sizeof(*scu) * nr, GFP_KERNEL);
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if (!scu) {
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dev_err(dev, "SCU allocate failed\n");
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return -ENOMEM;
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}
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priv->scu_nr = nr;
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priv->scu = scu;
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for_each_rsnd_scu(scu, priv, i) {
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snprintf(name, RSND_SCU_NAME_SIZE, "scu.%d", i);
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clk = devm_clk_get(dev, name);
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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scu->info = &info->scu_info[i];
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scu->clk = clk;
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ops = &rsnd_scu_non_ops;
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if (rsnd_scu_hpbif_is_enable(&scu->mod))
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ops = &rsnd_scu_ops;
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rsnd_mod_init(priv, &scu->mod, ops, i);
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dev_dbg(dev, "SCU%d probed\n", i);
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}
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dev_dbg(dev, "scu probed\n");
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return 0;
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}
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void rsnd_scu_remove(struct platform_device *pdev,
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struct rsnd_priv *priv)
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{
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}
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