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: Markus Pargmann mpa@pengutronix.de --- sound/soc/fsl/fsl_ssi.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+)
diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c index abe6172..e0594e9 100644 --- a/sound/soc/fsl/fsl_ssi.c +++ b/sound/soc/fsl/fsl_ssi.c @@ -122,6 +122,18 @@ static inline void write_ssi_mask(u32 __iomem *addr, u32 clear, u32 set) CCSR_SSI_SIER_TUE0_EN | CCSR_SSI_SIER_TFRC_EN) #define FSLSSI_SISR_MASK (FSLSSI_SIER_DBG_RX_FLAGS | FSLSSI_SIER_DBG_TX_FLAGS)
+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 * @@ -158,6 +170,8 @@ 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; @@ -442,6 +456,114 @@ 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;