ASoC: mediatek: Add AFE platform driver

This is the DPCM based platform driver of AFE (Audio Front End) unit.
Signed-off-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NKoro Chen <koro.chen@mediatek.com>
Signed-off-by: NMark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/sound/mtk-afe-pcm.txt

+Mediatek AFE PCM controller
+
+Required properties:
+- compatible = "mediatek,mt8173-afe-pcm";
+- reg: register location and size
+- interrupts: Should contain AFE interrupt
+- clock-names: should have these clock names:
+		"infra_sys_audio_clk",
+		"top_pdn_audio",
+		"top_pdn_aud_intbus",
+		"bck0",
+		"bck1",
+		"i2s0_m",
+		"i2s1_m",
+		"i2s2_m",
+		"i2s3_m",
+		"i2s3_b";
+
+Example:
+
+	afe: mt8173-afe-pcm@11220000  {
+		compatible = "mediatek,mt8173-afe-pcm";
+		reg = <0 0x11220000 0 0x1000>;
+		interrupts = <GIC_SPI 134 IRQ_TYPE_EDGE_FALLING>;
+		clocks = <&infracfg INFRA_AUDIO>,
+			<&topckgen TOP_AUDIO_SEL>,
+			<&topckgen TOP_AUD_INTBUS_SEL>,
+			<&topckgen TOP_APLL1_DIV0>,
+			<&topckgen TOP_APLL2_DIV0>,
+			<&topckgen TOP_I2S0_M_CK_SEL>,
+			<&topckgen TOP_I2S1_M_CK_SEL>,
+			<&topckgen TOP_I2S2_M_CK_SEL>,
+			<&topckgen TOP_I2S3_M_CK_SEL>,
+			<&topckgen TOP_I2S3_B_CK_SEL>;
+		clock-names = "infra_sys_audio_clk",
+				"top_pdn_audio",
+				"top_pdn_aud_intbus",
+				"bck0",
+				"bck1",
+				"i2s0_m",
+				"i2s1_m",
+				"i2s2_m",
+				"i2s3_m",
+				"i2s3_b";
+	};

sound/soc/Kconfig

@@ -45,6 +45,7 @@ source "sound/soc/nuc900/Kconfig"
 source "sound/soc/omap/Kconfig"
 source "sound/soc/kirkwood/Kconfig"
 source "sound/soc/intel/Kconfig"
+source "sound/soc/mediatek/Kconfig"
 source "sound/soc/mxs/Kconfig"
 source "sound/soc/pxa/Kconfig"
 source "sound/soc/qcom/Kconfig"

sound/soc/Makefile

@@ -23,6 +23,7 @@ obj-$(CONFIG_SND_SOC)	+= dwc/
 obj-$(CONFIG_SND_SOC)	+= fsl/
 obj-$(CONFIG_SND_SOC)	+= jz4740/
 obj-$(CONFIG_SND_SOC)	+= intel/
+obj-$(CONFIG_SND_SOC)	+= mediatek/
 obj-$(CONFIG_SND_SOC)	+= mxs/
 obj-$(CONFIG_SND_SOC)	+= nuc900/
 obj-$(CONFIG_SND_SOC)	+= omap/

sound/soc/mediatek/Kconfig

+config SND_SOC_MEDIATEK
+	tristate "ASoC support for Mediatek chip"
+	depends on ARCH_MEDIATEK
+	help
+	  This adds ASoC platform driver support for Mediatek chip
+	  that can be used with other codecs.
+	  Select Y if you have such device.
+	  Ex: MT8173
+

sound/soc/mediatek/Makefile

+# MTK Platform Support
+obj-$(CONFIG_SND_SOC_MEDIATEK) += mtk-afe-pcm.o

sound/soc/mediatek/mtk-afe-common.h

+/*
+ * mtk_afe_common.h  --  Mediatek audio driver common definitions
+ *
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author: Koro Chen <koro.chen@mediatek.com>
+ *             Sascha Hauer <s.hauer@pengutronix.de>
+ *             Hidalgo Huang <hidalgo.huang@mediatek.com>
+ *             Ir Lian <ir.lian@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef _MTK_AFE_COMMON_H_
+#define _MTK_AFE_COMMON_H_
+
+#include <linux/clk.h>
+#include <linux/regmap.h>
+
+enum {
+	MTK_AFE_MEMIF_DL1,
+	MTK_AFE_MEMIF_DL2,
+	MTK_AFE_MEMIF_VUL,
+	MTK_AFE_MEMIF_DAI,
+	MTK_AFE_MEMIF_AWB,
+	MTK_AFE_MEMIF_MOD_DAI,
+	MTK_AFE_MEMIF_HDMI,
+	MTK_AFE_MEMIF_NUM,
+	MTK_AFE_IO_MOD_PCM1 = MTK_AFE_MEMIF_NUM,
+	MTK_AFE_IO_MOD_PCM2,
+	MTK_AFE_IO_PMIC,
+	MTK_AFE_IO_I2S,
+	MTK_AFE_IO_2ND_I2S,
+	MTK_AFE_IO_HW_GAIN1,
+	MTK_AFE_IO_HW_GAIN2,
+	MTK_AFE_IO_MRG_O,
+	MTK_AFE_IO_MRG_I,
+	MTK_AFE_IO_DAIBT,
+	MTK_AFE_IO_HDMI,
+};
+
+enum {
+	MTK_AFE_IRQ_1,
+	MTK_AFE_IRQ_2,
+	MTK_AFE_IRQ_3,
+	MTK_AFE_IRQ_4,
+	MTK_AFE_IRQ_5,
+	MTK_AFE_IRQ_6,
+	MTK_AFE_IRQ_7,
+	MTK_AFE_IRQ_8,
+	MTK_AFE_IRQ_NUM,
+};
+
+enum {
+	MTK_CLK_INFRASYS_AUD,
+	MTK_CLK_TOP_PDN_AUD,
+	MTK_CLK_TOP_PDN_AUD_BUS,
+	MTK_CLK_I2S0_M,
+	MTK_CLK_I2S1_M,
+	MTK_CLK_I2S2_M,
+	MTK_CLK_I2S3_M,
+	MTK_CLK_I2S3_B,
+	MTK_CLK_BCK0,
+	MTK_CLK_BCK1,
+	MTK_CLK_NUM
+};
+
+struct mtk_afe;
+struct snd_pcm_substream;
+
+struct mtk_afe_memif_data {
+	int id;
+	const char *name;
+	int reg_ofs_base;
+	int reg_ofs_cur;
+	int fs_shift;
+	int mono_shift;
+	int enable_shift;
+	int irq_reg_cnt;
+	int irq_cnt_shift;
+	int irq_en_shift;
+	int irq_fs_shift;
+	int irq_clr_shift;
+};
+
+struct mtk_afe_memif {
+	unsigned int phys_buf_addr;
+	int buffer_size;
+	unsigned int hw_ptr;		/* Previous IRQ's HW ptr */
+	struct snd_pcm_substream *substream;
+	const struct mtk_afe_memif_data *data;
+	const struct mtk_afe_irq_data *irqdata;
+};
+
+struct mtk_afe {
+	/* address for ioremap audio hardware register */
+	void __iomem *base_addr;
+	struct device *dev;
+	struct regmap *regmap;
+	struct mtk_afe_memif memif[MTK_AFE_MEMIF_NUM];
+	struct clk *clocks[MTK_CLK_NUM];
+};
+#endif