ASoC: fsl: Add S/PDIF CPU DAI driver

This patch implements a device-tree-only CPU DAI driver for Freescale
S/PDIF controller that supports stereo playback and record feature.
Signed-off-by: Nicolin Chen <b42378@freescale.com>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

Documentation/devicetree/bindings/sound/fsl,spdif.txt

+Freescale Sony/Philips Digital Interface Format (S/PDIF) Controller
+
+The Freescale S/PDIF audio block is a stereo transceiver that allows the
+processor to receive and transmit digital audio via an coaxial cable or
+a fibre cable.
+
+Required properties:
+
+  - compatible : Compatible list, must contain "fsl,imx35-spdif".
+
+  - reg : Offset and length of the register set for the device.
+
+  - interrupts : Contains the spdif interrupt.
+
+  - dmas : Generic dma devicetree binding as described in
+  Documentation/devicetree/bindings/dma/dma.txt.
+
+  - dma-names : Two dmas have to be defined, "tx" and "rx".
+
+  - clocks : Contains an entry for each entry in clock-names.
+
+  - clock-names : Includes the following entries:
+	"core"		The core clock of spdif controller
+	"rxtx<0-7>"	Clock source list for tx and rx clock.
+			This clock list should be identical to
+			the source list connecting to the spdif
+			clock mux in "SPDIF Transceiver Clock
+			Diagram" of SoC reference manual. It
+			can also be referred to TxClk_Source
+			bit of register SPDIF_STC.
+
+Example:
+
+spdif: spdif@02004000 {
+	compatible = "fsl,imx35-spdif";
+	reg = <0x02004000 0x4000>;
+	interrupts = <0 52 0x04>;
+	dmas = <&sdma 14 18 0>,
+	       <&sdma 15 18 0>;
+	dma-names = "rx", "tx";
+
+	clocks = <&clks 197>, <&clks 3>,
+	       <&clks 197>, <&clks 107>,
+	       <&clks 0>, <&clks 118>,
+	       <&clks 62>, <&clks 139>,
+	       <&clks 0>;
+	clock-names = "core", "rxtx0",
+		"rxtx1", "rxtx2",
+		"rxtx3", "rxtx4",
+		"rxtx5", "rxtx6",
+		"rxtx7";
+
+	status = "okay";
+};

sound/soc/fsl/Kconfig

 config SND_SOC_FSL_SSI
 	tristate
 
+config SND_SOC_FSL_SPDIF
+	tristate
+
 config SND_SOC_FSL_UTILS
 	tristate
 

sound/soc/fsl/Makefile

@@ -12,9 +12,11 @@ obj-$(CONFIG_SND_SOC_P1022_RDK) += snd-soc-p1022-rdk.o
 
 # Freescale PowerPC SSI/DMA Platform Support
 snd-soc-fsl-ssi-objs := fsl_ssi.o
+snd-soc-fsl-spdif-objs := fsl_spdif.o
 snd-soc-fsl-utils-objs := fsl_utils.o
 snd-soc-fsl-dma-objs := fsl_dma.o
 obj-$(CONFIG_SND_SOC_FSL_SSI) += snd-soc-fsl-ssi.o
+obj-$(CONFIG_SND_SOC_FSL_SPDIF) += snd-soc-fsl-spdif.o
 obj-$(CONFIG_SND_SOC_FSL_UTILS) += snd-soc-fsl-utils.o
 obj-$(CONFIG_SND_SOC_POWERPC_DMA) += snd-soc-fsl-dma.o
 

sound/soc/fsl/fsl_spdif.h

+/*
+ * fsl_spdif.h - ALSA S/PDIF interface for the Freescale i.MX SoC
+ *
+ * Copyright (C) 2013 Freescale Semiconductor, Inc.
+ *
+ * Author: Nicolin Chen <b42378@freescale.com>
+ *
+ * Based on fsl_ssi.h
+ * Author: Timur Tabi <timur@freescale.com>
+ * Copyright 2007-2008 Freescale Semiconductor, Inc.
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program  is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ */
+
+#ifndef _FSL_SPDIF_DAI_H
+#define _FSL_SPDIF_DAI_H
+
+/* S/PDIF Register Map */
+#define REG_SPDIF_SCR 			0x0	/* SPDIF Configuration Register */
+#define REG_SPDIF_SRCD		 	0x4	/* CDText Control Register */
+#define REG_SPDIF_SRPC			0x8	/* PhaseConfig Register */
+#define REG_SPDIF_SIE			0xc	/* InterruptEn Register */
+#define REG_SPDIF_SIS			0x10	/* InterruptStat Register */
+#define REG_SPDIF_SIC			0x10	/* InterruptClear Register */
+#define REG_SPDIF_SRL			0x14	/* SPDIFRxLeft Register */
+#define REG_SPDIF_SRR			0x18	/* SPDIFRxRight Register */
+#define REG_SPDIF_SRCSH			0x1c	/* SPDIFRxCChannel_h Register */
+#define REG_SPDIF_SRCSL			0x20	/* SPDIFRxCChannel_l Register */
+#define REG_SPDIF_SRU			0x24	/* UchannelRx Register */
+#define REG_SPDIF_SRQ			0x28	/* QchannelRx Register */
+#define REG_SPDIF_STL			0x2C	/* SPDIFTxLeft Register */
+#define REG_SPDIF_STR			0x30	/* SPDIFTxRight Register */
+#define REG_SPDIF_STCSCH		0x34	/* SPDIFTxCChannelCons_h Register */
+#define REG_SPDIF_STCSCL		0x38	/* SPDIFTxCChannelCons_l Register */
+#define REG_SPDIF_SRFM			0x44	/* FreqMeas Register */
+#define REG_SPDIF_STC			0x50	/* SPDIFTxClk Register */
+
+
+/* SPDIF Configuration register */
+#define SCR_RXFIFO_CTL_OFFSET		23
+#define SCR_RXFIFO_CTL_MASK		(1 << SCR_RXFIFO_CTL_OFFSET)
+#define SCR_RXFIFO_CTL_ZERO		(1 << SCR_RXFIFO_CTL_OFFSET)
+#define SCR_RXFIFO_OFF_OFFSET		22
+#define SCR_RXFIFO_OFF_MASK		(1 << SCR_RXFIFO_OFF_OFFSET)
+#define SCR_RXFIFO_OFF			(1 << SCR_RXFIFO_OFF_OFFSET)
+#define SCR_RXFIFO_RST_OFFSET		21
+#define SCR_RXFIFO_RST_MASK		(1 << SCR_RXFIFO_RST_OFFSET)
+#define SCR_RXFIFO_RST			(1 << SCR_RXFIFO_RST_OFFSET)
+#define SCR_RXFIFO_FSEL_OFFSET		19
+#define SCR_RXFIFO_FSEL_MASK		(0x3 << SCR_RXFIFO_FSEL_OFFSET)
+#define SCR_RXFIFO_FSEL_IF0		(0x0 << SCR_RXFIFO_FSEL_OFFSET)
+#define SCR_RXFIFO_FSEL_IF4		(0x1 << SCR_RXFIFO_FSEL_OFFSET)
+#define SCR_RXFIFO_FSEL_IF8		(0x2 << SCR_RXFIFO_FSEL_OFFSET)
+#define SCR_RXFIFO_FSEL_IF12		(0x3 << SCR_RXFIFO_FSEL_OFFSET)
+#define SCR_RXFIFO_AUTOSYNC_OFFSET	18
+#define SCR_RXFIFO_AUTOSYNC_MASK	(1 << SCR_RXFIFO_AUTOSYNC_OFFSET)
+#define SCR_RXFIFO_AUTOSYNC		(1 << SCR_RXFIFO_AUTOSYNC_OFFSET)
+#define SCR_TXFIFO_AUTOSYNC_OFFSET	17
+#define SCR_TXFIFO_AUTOSYNC_MASK	(1 << SCR_TXFIFO_AUTOSYNC_OFFSET)
+#define SCR_TXFIFO_AUTOSYNC		(1 << SCR_TXFIFO_AUTOSYNC_OFFSET)
+#define SCR_TXFIFO_FSEL_OFFSET		15
+#define SCR_TXFIFO_FSEL_MASK		(0x3 << SCR_TXFIFO_FSEL_OFFSET)
+#define SCR_TXFIFO_FSEL_IF0		(0x0 << SCR_TXFIFO_FSEL_OFFSET)
+#define SCR_TXFIFO_FSEL_IF4		(0x1 << SCR_TXFIFO_FSEL_OFFSET)
+#define SCR_TXFIFO_FSEL_IF8		(0x2 << SCR_TXFIFO_FSEL_OFFSET)
+#define SCR_TXFIFO_FSEL_IF12		(0x3 << SCR_TXFIFO_FSEL_OFFSET)
+#define SCR_LOW_POWER			(1 << 13)
+#define SCR_SOFT_RESET			(1 << 12)
+#define SCR_TXFIFO_CTRL_OFFSET		10
+#define SCR_TXFIFO_CTRL_MASK		(0x3 << SCR_TXFIFO_CTRL_OFFSET)
+#define SCR_TXFIFO_CTRL_ZERO		(0x0 << SCR_TXFIFO_CTRL_OFFSET)
+#define SCR_TXFIFO_CTRL_NORMAL		(0x1 << SCR_TXFIFO_CTRL_OFFSET)
+#define SCR_TXFIFO_CTRL_ONESAMPLE	(0x2 << SCR_TXFIFO_CTRL_OFFSET)
+#define SCR_DMA_RX_EN_OFFSET		9
+#define SCR_DMA_RX_EN_MASK		(1 << SCR_DMA_RX_EN_OFFSET)
+#define SCR_DMA_RX_EN			(1 << SCR_DMA_RX_EN_OFFSET)
+#define SCR_DMA_TX_EN_OFFSET		8
+#define SCR_DMA_TX_EN_MASK		(1 << SCR_DMA_TX_EN_OFFSET)
+#define SCR_DMA_TX_EN			(1 << SCR_DMA_TX_EN_OFFSET)
+#define SCR_VAL_OFFSET			5
+#define SCR_VAL_MASK			(1 << SCR_VAL_OFFSET)
+#define SCR_VAL_CLEAR			(1 << SCR_VAL_OFFSET)
+#define SCR_TXSEL_OFFSET		2
+#define SCR_TXSEL_MASK			(0x7 << SCR_TXSEL_OFFSET)
+#define SCR_TXSEL_OFF			(0 << SCR_TXSEL_OFFSET)
+#define SCR_TXSEL_RX			(1 << SCR_TXSEL_OFFSET)
+#define SCR_TXSEL_NORMAL		(0x5 << SCR_TXSEL_OFFSET)
+#define SCR_USRC_SEL_OFFSET		0x0
+#define SCR_USRC_SEL_MASK		(0x3 << SCR_USRC_SEL_OFFSET)
+#define SCR_USRC_SEL_NONE		(0x0 << SCR_USRC_SEL_OFFSET)
+#define SCR_USRC_SEL_RECV		(0x1 << SCR_USRC_SEL_OFFSET)
+#define SCR_USRC_SEL_CHIP		(0x3 << SCR_USRC_SEL_OFFSET)
+
+/* SPDIF CDText control */
+#define SRCD_CD_USER_OFFSET		1
+#define SRCD_CD_USER			(1 << SRCD_CD_USER_OFFSET)
+
+/* SPDIF Phase Configuration register */
+#define SRPC_DPLL_LOCKED		(1 << 6)
+#define SRPC_CLKSRC_SEL_OFFSET		7
+#define SRPC_CLKSRC_SEL_MASK		(0xf << SRPC_CLKSRC_SEL_OFFSET)
+#define SRPC_CLKSRC_SEL_SET(x)		((x << SRPC_CLKSRC_SEL_OFFSET) & SRPC_CLKSRC_SEL_MASK)
+#define SRPC_CLKSRC_SEL_LOCKED_OFFSET1	5
+#define SRPC_CLKSRC_SEL_LOCKED_OFFSET2	2
+#define SRPC_GAINSEL_OFFSET		3
+#define SRPC_GAINSEL_MASK		(0x7 << SRPC_GAINSEL_OFFSET)
+#define SRPC_GAINSEL_SET(x)		((x << SRPC_GAINSEL_OFFSET) & SRPC_GAINSEL_MASK)
+
+#define SRPC_CLKSRC_MAX			16
+
+enum spdif_gainsel {
+	GAINSEL_MULTI_24 = 0,
+	GAINSEL_MULTI_16,
+	GAINSEL_MULTI_12,
+	GAINSEL_MULTI_8,
+	GAINSEL_MULTI_6,
+	GAINSEL_MULTI_4,
+	GAINSEL_MULTI_3,
+};
+#define GAINSEL_MULTI_MAX		(GAINSEL_MULTI_3 + 1)
+#define SPDIF_DEFAULT_GAINSEL		GAINSEL_MULTI_8
+
+/* SPDIF interrupt mask define */
+#define INT_DPLL_LOCKED			(1 << 20)
+#define INT_TXFIFO_UNOV			(1 << 19)
+#define INT_TXFIFO_RESYNC		(1 << 18)
+#define INT_CNEW			(1 << 17)
+#define INT_VAL_NOGOOD			(1 << 16)
+#define INT_SYM_ERR			(1 << 15)
+#define INT_BIT_ERR			(1 << 14)
+#define INT_URX_FUL			(1 << 10)
+#define INT_URX_OV			(1 << 9)
+#define INT_QRX_FUL			(1 << 8)
+#define INT_QRX_OV			(1 << 7)
+#define INT_UQ_SYNC			(1 << 6)
+#define INT_UQ_ERR			(1 << 5)
+#define INT_RXFIFO_UNOV			(1 << 4)
+#define INT_RXFIFO_RESYNC		(1 << 3)
+#define INT_LOSS_LOCK			(1 << 2)
+#define INT_TX_EM			(1 << 1)
+#define INT_RXFIFO_FUL			(1 << 0)
+
+/* SPDIF Clock register */
+#define STC_SYSCLK_DIV_OFFSET		11
+#define STC_SYSCLK_DIV_MASK		(0x1ff << STC_TXCLK_SRC_OFFSET)
+#define STC_SYSCLK_DIV(x)		((((x) - 1) << STC_TXCLK_DIV_OFFSET) & STC_SYSCLK_DIV_MASK)
+#define STC_TXCLK_SRC_OFFSET		8
+#define STC_TXCLK_SRC_MASK		(0x7 << STC_TXCLK_SRC_OFFSET)
+#define STC_TXCLK_SRC_SET(x)		((x << STC_TXCLK_SRC_OFFSET) & STC_TXCLK_SRC_MASK)
+#define STC_TXCLK_ALL_EN_OFFSET		7
+#define STC_TXCLK_ALL_EN_MASK		(1 << STC_TXCLK_ALL_EN_OFFSET)
+#define STC_TXCLK_ALL_EN		(1 << STC_TXCLK_ALL_EN_OFFSET)
+#define STC_TXCLK_DIV_OFFSET		0
+#define STC_TXCLK_DIV_MASK		(0x7ff << STC_TXCLK_DIV_OFFSET)
+#define STC_TXCLK_DIV(x)		((((x) - 1) << STC_TXCLK_DIV_OFFSET) & STC_TXCLK_DIV_MASK)
+#define STC_TXCLK_SRC_MAX		8
+
+/* SPDIF tx rate */
+enum spdif_txrate {
+	SPDIF_TXRATE_32000 = 0,
+	SPDIF_TXRATE_44100,
+	SPDIF_TXRATE_48000,
+};
+#define SPDIF_TXRATE_MAX		(SPDIF_TXRATE_48000 + 1)
+
+
+#define SPDIF_CSTATUS_BYTE		6
+#define SPDIF_UBITS_SIZE		96
+#define SPDIF_QSUB_SIZE			(SPDIF_UBITS_SIZE / 8)
+
+
+#define FSL_SPDIF_RATES_PLAYBACK	(SNDRV_PCM_RATE_32000 |	\
+					 SNDRV_PCM_RATE_44100 |	\
+					 SNDRV_PCM_RATE_48000)
+
+#define FSL_SPDIF_RATES_CAPTURE		(SNDRV_PCM_RATE_16000 | \
+					 SNDRV_PCM_RATE_32000 |	\
+					 SNDRV_PCM_RATE_44100 | \
+					 SNDRV_PCM_RATE_48000 |	\
+					 SNDRV_PCM_RATE_64000 | \
+					 SNDRV_PCM_RATE_96000)
+
+#define FSL_SPDIF_FORMATS_PLAYBACK	(SNDRV_PCM_FMTBIT_S16_LE | \
+					 SNDRV_PCM_FMTBIT_S20_3LE | \
+					 SNDRV_PCM_FMTBIT_S24_LE)
+
+#define FSL_SPDIF_FORMATS_CAPTURE	(SNDRV_PCM_FMTBIT_S24_LE)
+
+#endif /* _FSL_SPDIF_DAI_H */