Commit 4e6ec0d9 authored by Markus Pargmann's avatar Markus Pargmann Committed by Mark Brown
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ASoC: fsl-ssi: Add configuration helper functions 



This patch adds a struct 'fsl_ssi_rxtx_reg_val' which holds register
values necessary to enable rx/tx. Based on those preset register values,
the added configuration functions will cleanly enable/disable different
parts of the SSI IP while supporting online/offline configuration.
Different operating modes can be setup directly as different register
values in fsl_ssi_reg_val.

These functions and structs will help to cleanup and simplify the
trigger function to support many different IP versions (online/offline
configuration) and different operating modes.

Signed-off-by: default avatarMarkus Pargmann <mpa@pengutronix.de>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent bd3ca7d1

sound/soc/fsl/fsl_ssi.c

+122 −0
Original line number Diff line number Diff line
@@ -131,6 +131,18 @@ enum fsl_ssi_type { 
	FSL_SSI_MX51,

};



struct fsl_ssi_reg_val {

	u32 sier;

	u32 srcr;

	u32 stcr;

	u32 scr;

};



struct fsl_ssi_rxtx_reg_val {

	struct fsl_ssi_reg_val rx;

	struct fsl_ssi_reg_val tx;

};



/**

 * fsl_ssi_private: per-SSI private data

 *
@@ -169,6 +181,8 @@ struct fsl_ssi_private { 
	struct imx_dma_data filter_data_tx;

	struct imx_dma_data filter_data_rx;

	struct imx_pcm_fiq_params fiq_params;

	/* Register values for rx/tx configuration */

	struct fsl_ssi_rxtx_reg_val rxtx_reg_val;



	struct {

		unsigned int rfrc;
@@ -462,6 +476,114 @@ static void fsl_ssi_debugfs_remove(struct fsl_ssi_private *ssi_private) 


#endif /* IS_ENABLED(CONFIG_DEBUG_FS) */



/*

 * Enable/Disable all rx/tx config flags at once.

 */

static void fsl_ssi_rxtx_config(struct fsl_ssi_private *ssi_private,

		bool enable)

{

	struct ccsr_ssi __iomem *ssi = ssi_private->ssi;

	struct fsl_ssi_rxtx_reg_val *vals = &ssi_private->rxtx_reg_val;



	if (enable) {

		write_ssi_mask(&ssi->sier, 0, vals->rx.sier | vals->tx.sier);

		write_ssi_mask(&ssi->srcr, 0, vals->rx.srcr | vals->tx.srcr);

		write_ssi_mask(&ssi->stcr, 0, vals->rx.stcr | vals->tx.stcr);

	} else {

		write_ssi_mask(&ssi->srcr, vals->rx.srcr | vals->tx.srcr, 0);

		write_ssi_mask(&ssi->stcr, vals->rx.stcr | vals->tx.stcr, 0);

		write_ssi_mask(&ssi->sier, vals->rx.sier | vals->tx.sier, 0);

	}

}



/*

 * Enable/Disable a ssi configuration. You have to pass either

 * ssi_private->rxtx_reg_val.rx or tx as vals parameter.

 */

static void fsl_ssi_config(struct fsl_ssi_private *ssi_private, bool enable,

		struct fsl_ssi_reg_val *vals)

{

	struct ccsr_ssi __iomem *ssi = ssi_private->ssi;

	struct fsl_ssi_reg_val *avals;

	u32 scr_val = read_ssi(&ssi->scr);

	int nr_active_streams = !!(scr_val & CCSR_SSI_SCR_TE) +

				!!(scr_val & CCSR_SSI_SCR_RE);



	/* Find the other direction values rx or tx which we do not want to

	 * modify */

	if (&ssi_private->rxtx_reg_val.rx == vals)

		avals = &ssi_private->rxtx_reg_val.tx;

	else

		avals = &ssi_private->rxtx_reg_val.rx;



	/* If vals should be disabled, start with disabling the unit */

	if (!enable) {

		u32 scr = vals->scr & (vals->scr ^ avals->scr);

		write_ssi_mask(&ssi->scr, scr, 0);

	}



	/*

	 * We are running on a SoC which does not support online SSI

	 * reconfiguration, so we have to enable all necessary flags at once

	 * even if we do not use them later (capture and playback configuration)

	 */

	if (ssi_private->offline_config) {

		if ((enable && !nr_active_streams) ||

				(!enable && nr_active_streams == 1))

			fsl_ssi_rxtx_config(ssi_private, enable);



		goto config_done;

	}



	/*

	 * Configure single direction units while the SSI unit is running

	 * (online configuration)

	 */

	if (enable) {

		write_ssi_mask(&ssi->sier, 0, vals->sier);

		write_ssi_mask(&ssi->srcr, 0, vals->srcr);

		write_ssi_mask(&ssi->stcr, 0, vals->stcr);

	} else {

		u32 sier;

		u32 srcr;

		u32 stcr;



		/*

		 * Disabling the necessary flags for one of rx/tx while the

		 * other stream is active is a little bit more difficult. We

		 * have to disable only those flags that differ between both

		 * streams (rx XOR tx) and that are set in the stream that is

		 * disabled now. Otherwise we could alter flags of the other

		 * stream

		 */



		/* These assignments are simply vals without bits set in avals*/

		sier = vals->sier & (vals->sier ^ avals->sier);

		srcr = vals->srcr & (vals->srcr ^ avals->srcr);

		stcr = vals->stcr & (vals->stcr ^ avals->stcr);



		write_ssi_mask(&ssi->srcr, srcr, 0);

		write_ssi_mask(&ssi->stcr, stcr, 0);

		write_ssi_mask(&ssi->sier, sier, 0);

	}



config_done:

	/* Enabling of subunits is done after configuration */

	if (enable)

		write_ssi_mask(&ssi->scr, 0, vals->scr);

}





static void fsl_ssi_rx_config(struct fsl_ssi_private *ssi_private, bool enable)

{

	fsl_ssi_config(ssi_private, enable, &ssi_private->rxtx_reg_val.rx);

}



static void fsl_ssi_tx_config(struct fsl_ssi_private *ssi_private, bool enable)

{

	fsl_ssi_config(ssi_private, enable, &ssi_private->rxtx_reg_val.tx);

}



static void fsl_ssi_setup_ac97(struct fsl_ssi_private *ssi_private)

{

	struct ccsr_ssi __iomem *ssi = ssi_private->ssi;

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