22 #include "mxs-saif.h"
30  * SAIF is a little different with other normal SOC DAIs on clock using.
32  * For MXS, two SAIF modules are instantiated on-chip.
33  * Each SAIF has a set of clock pins and can be operating in master
36  * other SAIF, in slave mode, receives clocking from the master SAIF.
39  * We abstract this as each saif has a master, the master could be
40  * itself or other saifs. In the generic saif driver, saif does not need
41  * to know the different clkmux. Saif only needs to know who is its master
50 	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);  in mxs_saif_set_dai_sysclk()  local
54 		saif->mclk = freq;  in mxs_saif_set_dai_sysclk()
63  * Since SAIF may work on EXTMASTER mode, IOW, it's working BITCLK&LRCLK
64  * is provided by other SAIF, we provide a interface here to get its master
68 static inline struct mxs_saif *mxs_saif_get_master(struct mxs_saif * saif)  in mxs_saif_get_master()  argument
70 	return mxs_saif[saif->master_id];  in mxs_saif_get_master()
74  * Set SAIF clock and MCLK
76 static int mxs_saif_set_clk(struct mxs_saif *saif,  in mxs_saif_set_clk()  argument
84 	dev_dbg(saif->dev, "mclk %d rate %d\n", mclk, rate);  in mxs_saif_set_clk()
86 	/* Set master saif to generate proper clock */  in mxs_saif_set_clk()
87 	master_saif = mxs_saif_get_master(saif);  in mxs_saif_set_clk()
91 	dev_dbg(saif->dev, "master saif%d\n", master_saif->id);  in mxs_saif_set_clk()
95 		dev_err(saif->dev,  in mxs_saif_set_clk()
96 			"can not change clock, master saif%d(rate %d) is ongoing\n",  in mxs_saif_set_clk()
106 	 * Set SAIF clock  in mxs_saif_set_clk()
108 	 * The SAIF clock should be either 384*fs or 512*fs.  in mxs_saif_set_clk()
109 	 * If MCLK is used, the SAIF clk ratio needs to match mclk ratio.  in mxs_saif_set_clk()
110 	 *  For 256x, 128x, 64x, and 32x sub-rates, set saif clk as 512*fs.  in mxs_saif_set_clk()
111 	 *  For 192x, 96x, and 48x sub-rates, set saif clk as 384*fs.  in mxs_saif_set_clk()
113 	 * If MCLK is not used, we just set saif clk to 512*fs.  in mxs_saif_set_clk()
137 			/* SAIF MCLK should be a sub-rate of 512x or 384x */  in mxs_saif_set_clk()
206 	struct mxs_saif *saif = mxs_saif[saif_id];  in mxs_saif_put_mclk()  local
209 	if (!saif)  in mxs_saif_put_mclk()
212 	stat = __raw_readl(saif->base + SAIF_STAT);  in mxs_saif_put_mclk()
214 		dev_err(saif->dev, "error: busy\n");  in mxs_saif_put_mclk()
218 	clk_disable_unprepare(saif->clk);  in mxs_saif_put_mclk()
222 		saif->base + SAIF_CTRL + MXS_SET_ADDR);  in mxs_saif_put_mclk()
224 		saif->base + SAIF_CTRL + MXS_CLR_ADDR);  in mxs_saif_put_mclk()
226 	saif->mclk_in_use = 0;  in mxs_saif_put_mclk()
235  * by saif.
240 	struct mxs_saif *saif = mxs_saif[saif_id];  in mxs_saif_get_mclk()  local
245 	if (!saif)  in mxs_saif_get_mclk()
250 		saif->base + SAIF_CTRL + MXS_CLR_ADDR);  in mxs_saif_get_mclk()
254 		saif->base + SAIF_CTRL + MXS_CLR_ADDR);  in mxs_saif_get_mclk()
256 	master_saif = mxs_saif_get_master(saif);  in mxs_saif_get_mclk()
257 	if (saif != master_saif) {  in mxs_saif_get_mclk()
258 		dev_err(saif->dev, "can not get mclk from a non-master saif\n");  in mxs_saif_get_mclk()
262 	stat = __raw_readl(saif->base + SAIF_STAT);  in mxs_saif_get_mclk()
264 		dev_err(saif->dev, "error: busy\n");  in mxs_saif_get_mclk()
268 	saif->mclk_in_use = 1;  in mxs_saif_get_mclk()
269 	ret = mxs_saif_set_clk(saif, mclk, rate);  in mxs_saif_get_mclk()
273 	ret = clk_prepare_enable(saif->clk);  in mxs_saif_get_mclk()
279 		saif->base + SAIF_CTRL + MXS_SET_ADDR);  in mxs_saif_get_mclk()
286  * SAIF DAI format configuration.
293 	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);  in mxs_saif_set_dai_fmt()  local
295 	stat = __raw_readl(saif->base + SAIF_STAT);  in mxs_saif_set_dai_fmt()
304 	if (saif->id != saif->master_id) {  in mxs_saif_set_dai_fmt()
306 			saif->base + SAIF_CTRL + MXS_CLR_ADDR);  in mxs_saif_set_dai_fmt()
308 			saif->base + SAIF_CTRL + MXS_CLR_ADDR);  in mxs_saif_set_dai_fmt()
311 	scr0 = __raw_readl(saif->base + SAIF_CTRL);  in mxs_saif_set_dai_fmt()
354 	 * Note: We simply just support master mode since SAIF TX can only  in mxs_saif_set_dai_fmt()
357 	 * Saif internally could be slave when working on EXTMASTER mode.  in mxs_saif_set_dai_fmt()
362 		if (saif->id == saif->master_id)  in mxs_saif_set_dai_fmt()
367 		__raw_writel(scr | scr0, saif->base + SAIF_CTRL);  in mxs_saif_set_dai_fmt()
379 	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);  in mxs_saif_startup()  local
383 	saif->fifo_underrun = 0;  in mxs_saif_startup()
384 	saif->fifo_overrun = 0;  in mxs_saif_startup()
388 		saif->base + SAIF_CTRL + MXS_CLR_ADDR);  in mxs_saif_startup()
392 		saif->base + SAIF_CTRL + MXS_CLR_ADDR);  in mxs_saif_startup()
394 	ret = clk_prepare(saif->clk);  in mxs_saif_startup()
404 	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);  in mxs_saif_shutdown()  local
406 	clk_unprepare(saif->clk);  in mxs_saif_shutdown()
417 	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);  in mxs_saif_hw_params()  local
422 	master_saif = mxs_saif_get_master(saif);  in mxs_saif_hw_params()
427 	if (!saif->mclk && saif->mclk_in_use) {  in mxs_saif_hw_params()
432 	stat = __raw_readl(saif->base + SAIF_STAT);  in mxs_saif_hw_params()
433 	if (!saif->mclk_in_use && (stat & BM_SAIF_STAT_BUSY)) {  in mxs_saif_hw_params()
439 	 * Set saif clk based on sample rate.  in mxs_saif_hw_params()
440 	 * If mclk is used, we also set mclk, if not, saif->mclk is  in mxs_saif_hw_params()
443 	ret = mxs_saif_set_clk(saif, saif->mclk, params_rate(params));  in mxs_saif_hw_params()
449 	if (saif != master_saif) {  in mxs_saif_hw_params()
451 		* Set an initial clock rate for the saif internal logic to work  in mxs_saif_hw_params()
453 		* that uses the other saif's BITCLK&LRCLK but it still needs a  in mxs_saif_hw_params()
457 		ret = clk_enable(saif->clk);  in mxs_saif_hw_params()
461 		ret = clk_set_rate(saif->clk, 24000000);  in mxs_saif_hw_params()
462 		clk_disable(saif->clk);  in mxs_saif_hw_params()
471 	scr = __raw_readl(saif->base + SAIF_CTRL);  in mxs_saif_hw_params()
500 	__raw_writel(scr, saif->base + SAIF_CTRL);  in mxs_saif_hw_params()
507 	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);  in mxs_saif_prepare()  local
511 		saif->base + SAIF_CTRL + MXS_SET_ADDR);  in mxs_saif_prepare()
519 	struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);  in mxs_saif_trigger()  local
524 	master_saif = mxs_saif_get_master(saif);  in mxs_saif_trigger()
532 		if (saif->state == MXS_SAIF_STATE_RUNNING)  in mxs_saif_trigger()
539 			dev_err(saif->dev, "Failed to enable master clock\n");  in mxs_saif_trigger()
544 		 * If the saif's master is not itself, we also need to enable  in mxs_saif_trigger()
547 		if (saif != master_saif) {  in mxs_saif_trigger()
548 			ret = clk_enable(saif->clk);  in mxs_saif_trigger()
550 				dev_err(saif->dev, "Failed to enable master clock\n");  in mxs_saif_trigger()
556 				saif->base + SAIF_CTRL + MXS_SET_ADDR);  in mxs_saif_trigger()
565 			 * write data to saif data register to trigger  in mxs_saif_trigger()
571 			__raw_writel(0, saif->base + SAIF_DATA);  in mxs_saif_trigger()
572 			__raw_writel(0, saif->base + SAIF_DATA);  in mxs_saif_trigger()
575 			 * read data from saif data register to trigger  in mxs_saif_trigger()
581 			__raw_readl(saif->base + SAIF_DATA);  in mxs_saif_trigger()
582 			__raw_readl(saif->base + SAIF_DATA);  in mxs_saif_trigger()
586 		saif->state = MXS_SAIF_STATE_RUNNING;  in mxs_saif_trigger()
588 		dev_dbg(saif->dev, "CTRL 0x%x STAT 0x%x\n",  in mxs_saif_trigger()
589 			__raw_readl(saif->base + SAIF_CTRL),  in mxs_saif_trigger()
590 			__raw_readl(saif->base + SAIF_STAT));  in mxs_saif_trigger()
599 		if (saif->state == MXS_SAIF_STATE_STOPPED)  in mxs_saif_trigger()
614 		if (saif != master_saif) {  in mxs_saif_trigger()
616 				saif->base + SAIF_CTRL + MXS_CLR_ADDR);  in mxs_saif_trigger()
618 			clk_disable(saif->clk);  in mxs_saif_trigger()
622 		saif->state = MXS_SAIF_STATE_STOPPED;  in mxs_saif_trigger()
648 	.name = "mxs-saif",
665 	.name			= "mxs-saif",
671 	struct mxs_saif *saif = dev_id;  in mxs_saif_irq()  local
674 	stat = __raw_readl(saif->base + SAIF_STAT);  in mxs_saif_irq()
680 		dev_dbg(saif->dev, "underrun!!! %d\n", ++saif->fifo_underrun);  in mxs_saif_irq()
682 				saif->base + SAIF_STAT + MXS_CLR_ADDR);  in mxs_saif_irq()
686 		dev_dbg(saif->dev, "overrun!!! %d\n", ++saif->fifo_overrun);  in mxs_saif_irq()
688 				saif->base + SAIF_STAT + MXS_CLR_ADDR);  in mxs_saif_irq()
691 	dev_dbg(saif->dev, "SAIF_CTRL %x SAIF_STAT %x\n",  in mxs_saif_irq()
692 	       __raw_readl(saif->base + SAIF_CTRL),  in mxs_saif_irq()
693 	       __raw_readl(saif->base + SAIF_STAT));  in mxs_saif_irq()
700 	struct mxs_saif *saif = platform_get_drvdata(pdev);  in mxs_saif_mclk_init()  local
706 				   __clk_get_name(saif->clk), 0,  in mxs_saif_mclk_init()
707 				   saif->base + SAIF_CTRL,  in mxs_saif_mclk_init()
728 	struct mxs_saif *saif;  in mxs_saif_probe()  local
732 	saif = devm_kzalloc(&pdev->dev, sizeof(*saif), GFP_KERNEL);  in mxs_saif_probe()
733 	if (!saif)  in mxs_saif_probe()
736 	ret = of_alias_get_id(np, "saif");  in mxs_saif_probe()
740 		saif->id = ret;  in mxs_saif_probe()
742 	if (saif->id >= ARRAY_SIZE(mxs_saif)) {  in mxs_saif_probe()
743 		dev_err(&pdev->dev, "get wrong saif id\n");  in mxs_saif_probe()
748 	 * If there is no "fsl,saif-master" phandle, it's a saif  in mxs_saif_probe()
752 	master = of_parse_phandle(np, "fsl,saif-master", 0);  in mxs_saif_probe()
754 		saif->master_id = saif->id;  in mxs_saif_probe()
756 		ret = of_alias_get_id(master, "saif");  in mxs_saif_probe()
761 			saif->master_id = ret;  in mxs_saif_probe()
763 		if (saif->master_id >= ARRAY_SIZE(mxs_saif)) {  in mxs_saif_probe()
769 	mxs_saif[saif->id] = saif;  in mxs_saif_probe()
771 	saif->clk = devm_clk_get(&pdev->dev, NULL);  in mxs_saif_probe()
772 	if (IS_ERR(saif->clk)) {  in mxs_saif_probe()
773 		ret = PTR_ERR(saif->clk);  in mxs_saif_probe()
779 	saif->base = devm_platform_ioremap_resource(pdev, 0);  in mxs_saif_probe()
780 	if (IS_ERR(saif->base))  in mxs_saif_probe()
781 		return PTR_ERR(saif->base);  in mxs_saif_probe()
787 	saif->dev = &pdev->dev;  in mxs_saif_probe()
789 			       dev_name(&pdev->dev), saif);  in mxs_saif_probe()
795 	platform_set_drvdata(pdev, saif);  in mxs_saif_probe()
798 	if (saif->id == 0) {  in mxs_saif_probe()
821 	{ .compatible = "fsl,imx28-saif", },
830 		.name = "mxs-saif",
838 MODULE_DESCRIPTION("MXS ASoC SAIF driver");
840 MODULE_ALIAS("platform:mxs-saif");