ASoC: sunxi: Add support for the SPDIF block

The sun4i, sun5i and sun7i SoC families have an SPDIF
block which is capable of playback and capture.

This patch enables the playback of this block for
the sun4i families.

Signed-off-by: Marcus Cooper <codekipper@gmail.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 559 insertions, 0 deletions

diff --git a/sound/soc/sunxi/Kconfig b/sound/soc/sunxi/Kconfig
index 84c72ec6ad73..ae42294ef688 100644
--- a/sound/soc/sunxi/Kconfig
+++ b/sound/soc/sunxi/Kconfig
@@ -8,4 +8,12 @@ config SND_SUN4I_CODEC
           Select Y or M to add support for the Codec embedded in the Allwinner
           A10 and affiliated SoCs.
 
+config SND_SUN4I_SPDIF
+        tristate "Allwinner A10 SPDIF Support"
+        depends on OF
+        select SND_SOC_GENERIC_DMAENGINE_PCM
+        select REGMAP_MMIO
+        help
+          Say Y or M to add support for the S/PDIF audio block in the Allwinner
+          A10 and affiliated SoCs.
 endmenu
diff --git a/sound/soc/sunxi/Makefile b/sound/soc/sunxi/Makefile
index ea8a08c881d6..8f5e889667f1 100644
--- a/sound/soc/sunxi/Makefile
+++ b/sound/soc/sunxi/Makefile
@@ -1,2 +1,3 @@
 obj-$(CONFIG_SND_SUN4I_CODEC) += sun4i-codec.o
 
+obj-$(CONFIG_SND_SUN4I_SPDIF) += sun4i-spdif.o
diff --git a/sound/soc/sunxi/sun4i-spdif.c b/sound/soc/sunxi/sun4i-spdif.c
new file mode 100644
index 000000000000..0b04fb02125c
--- /dev/null
+++ b/sound/soc/sunxi/sun4i-spdif.c
@@ -0,0 +1,550 @@
+/*
+ * ALSA SoC SPDIF Audio Layer
+ *
+ * Copyright 2015 Andrea Venturi <be17068@iperbole.bo.it>
+ * Copyright 2015 Marcus Cooper <codekipper@gmail.com>
+ *
+ * Based on the Allwinner SDK driver, released under the GPL.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/regmap.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#define SUN4I_SPDIF_CTL         (0x00)
+        #define SUN4I_SPDIF_CTL_MCLKDIV(v)              ((v) << 4) /* v even */
+        #define SUN4I_SPDIF_CTL_MCLKOUTEN               BIT(2)
+        #define SUN4I_SPDIF_CTL_GEN                     BIT(1)
+        #define SUN4I_SPDIF_CTL_RESET                   BIT(0)
+
+#define SUN4I_SPDIF_TXCFG       (0x04)
+        #define SUN4I_SPDIF_TXCFG_SINGLEMOD             BIT(31)
+        #define SUN4I_SPDIF_TXCFG_ASS                   BIT(17)
+        #define SUN4I_SPDIF_TXCFG_NONAUDIO              BIT(16)
+        #define SUN4I_SPDIF_TXCFG_TXRATIO(v)            ((v) << 4)
+        #define SUN4I_SPDIF_TXCFG_TXRATIO_MASK          GENMASK(8, 4)
+        #define SUN4I_SPDIF_TXCFG_FMTRVD                GENMASK(3, 2)
+        #define SUN4I_SPDIF_TXCFG_FMT16BIT              (0 << 2)
+        #define SUN4I_SPDIF_TXCFG_FMT20BIT              (1 << 2)
+        #define SUN4I_SPDIF_TXCFG_FMT24BIT              (2 << 2)
+        #define SUN4I_SPDIF_TXCFG_CHSTMODE              BIT(1)
+        #define SUN4I_SPDIF_TXCFG_TXEN                  BIT(0)
+
+#define SUN4I_SPDIF_RXCFG       (0x08)
+        #define SUN4I_SPDIF_RXCFG_LOCKFLAG              BIT(4)
+        #define SUN4I_SPDIF_RXCFG_CHSTSRC               BIT(3)
+        #define SUN4I_SPDIF_RXCFG_CHSTCP                BIT(1)
+        #define SUN4I_SPDIF_RXCFG_RXEN                  BIT(0)
+
+#define SUN4I_SPDIF_TXFIFO      (0x0C)
+
+#define SUN4I_SPDIF_RXFIFO      (0x10)
+
+#define SUN4I_SPDIF_FCTL        (0x14)
+        #define SUN4I_SPDIF_FCTL_FIFOSRC                BIT(31)
+        #define SUN4I_SPDIF_FCTL_FTX                    BIT(17)
+        #define SUN4I_SPDIF_FCTL_FRX                    BIT(16)
+        #define SUN4I_SPDIF_FCTL_TXTL(v)                ((v) << 8)
+        #define SUN4I_SPDIF_FCTL_TXTL_MASK              GENMASK(12, 8)
+        #define SUN4I_SPDIF_FCTL_RXTL(v)                ((v) << 3)
+        #define SUN4I_SPDIF_FCTL_RXTL_MASK              GENMASK(7, 3)
+        #define SUN4I_SPDIF_FCTL_TXIM                   BIT(2)
+        #define SUN4I_SPDIF_FCTL_RXOM(v)                ((v) << 0)
+        #define SUN4I_SPDIF_FCTL_RXOM_MASK              GENMASK(1, 0)
+
+#define SUN4I_SPDIF_FSTA        (0x18)
+        #define SUN4I_SPDIF_FSTA_TXE                    BIT(14)
+        #define SUN4I_SPDIF_FSTA_TXECNTSHT              (8)
+        #define SUN4I_SPDIF_FSTA_RXA                    BIT(6)
+        #define SUN4I_SPDIF_FSTA_RXACNTSHT              (0)
+
+#define SUN4I_SPDIF_INT         (0x1C)
+        #define SUN4I_SPDIF_INT_RXLOCKEN                BIT(18)
+        #define SUN4I_SPDIF_INT_RXUNLOCKEN              BIT(17)
+        #define SUN4I_SPDIF_INT_RXPARERREN              BIT(16)
+        #define SUN4I_SPDIF_INT_TXDRQEN                 BIT(7)
+        #define SUN4I_SPDIF_INT_TXUIEN                  BIT(6)
+        #define SUN4I_SPDIF_INT_TXOIEN                  BIT(5)
+        #define SUN4I_SPDIF_INT_TXEIEN                  BIT(4)
+        #define SUN4I_SPDIF_INT_RXDRQEN                 BIT(2)
+        #define SUN4I_SPDIF_INT_RXOIEN                  BIT(1)
+        #define SUN4I_SPDIF_INT_RXAIEN                  BIT(0)
+
+#define SUN4I_SPDIF_ISTA        (0x20)
+        #define SUN4I_SPDIF_ISTA_RXLOCKSTA              BIT(18)
+        #define SUN4I_SPDIF_ISTA_RXUNLOCKSTA            BIT(17)
+        #define SUN4I_SPDIF_ISTA_RXPARERRSTA            BIT(16)
+        #define SUN4I_SPDIF_ISTA_TXUSTA                 BIT(6)
+        #define SUN4I_SPDIF_ISTA_TXOSTA                 BIT(5)
+        #define SUN4I_SPDIF_ISTA_TXESTA                 BIT(4)
+        #define SUN4I_SPDIF_ISTA_RXOSTA                 BIT(1)
+        #define SUN4I_SPDIF_ISTA_RXASTA                 BIT(0)
+
+#define SUN4I_SPDIF_TXCNT       (0x24)
+
+#define SUN4I_SPDIF_RXCNT       (0x28)
+
+#define SUN4I_SPDIF_TXCHSTA0    (0x2C)
+        #define SUN4I_SPDIF_TXCHSTA0_CLK(v)             ((v) << 28)
+        #define SUN4I_SPDIF_TXCHSTA0_SAMFREQ(v)         ((v) << 24)
+        #define SUN4I_SPDIF_TXCHSTA0_SAMFREQ_MASK       GENMASK(27, 24)
+        #define SUN4I_SPDIF_TXCHSTA0_CHNUM(v)           ((v) << 20)
+        #define SUN4I_SPDIF_TXCHSTA0_CHNUM_MASK         GENMASK(23, 20)
+        #define SUN4I_SPDIF_TXCHSTA0_SRCNUM(v)          ((v) << 16)
+        #define SUN4I_SPDIF_TXCHSTA0_CATACOD(v)         ((v) << 8)
+        #define SUN4I_SPDIF_TXCHSTA0_MODE(v)            ((v) << 6)
+        #define SUN4I_SPDIF_TXCHSTA0_EMPHASIS(v)        ((v) << 3)
+        #define SUN4I_SPDIF_TXCHSTA0_CP                 BIT(2)
+        #define SUN4I_SPDIF_TXCHSTA0_AUDIO              BIT(1)
+        #define SUN4I_SPDIF_TXCHSTA0_PRO                BIT(0)
+
+#define SUN4I_SPDIF_TXCHSTA1    (0x30)
+        #define SUN4I_SPDIF_TXCHSTA1_CGMSA(v)           ((v) << 8)
+        #define SUN4I_SPDIF_TXCHSTA1_ORISAMFREQ(v)      ((v) << 4)
+        #define SUN4I_SPDIF_TXCHSTA1_ORISAMFREQ_MASK    GENMASK(7, 4)
+        #define SUN4I_SPDIF_TXCHSTA1_SAMWORDLEN(v)      ((v) << 1)
+        #define SUN4I_SPDIF_TXCHSTA1_MAXWORDLEN         BIT(0)
+
+#define SUN4I_SPDIF_RXCHSTA0    (0x34)
+        #define SUN4I_SPDIF_RXCHSTA0_CLK(v)             ((v) << 28)
+        #define SUN4I_SPDIF_RXCHSTA0_SAMFREQ(v)         ((v) << 24)
+        #define SUN4I_SPDIF_RXCHSTA0_CHNUM(v)           ((v) << 20)
+        #define SUN4I_SPDIF_RXCHSTA0_SRCNUM(v)          ((v) << 16)
+        #define SUN4I_SPDIF_RXCHSTA0_CATACOD(v)         ((v) << 8)
+        #define SUN4I_SPDIF_RXCHSTA0_MODE(v)            ((v) << 6)
+        #define SUN4I_SPDIF_RXCHSTA0_EMPHASIS(v)        ((v) << 3)
+        #define SUN4I_SPDIF_RXCHSTA0_CP                 BIT(2)
+        #define SUN4I_SPDIF_RXCHSTA0_AUDIO              BIT(1)
+        #define SUN4I_SPDIF_RXCHSTA0_PRO                BIT(0)
+
+#define SUN4I_SPDIF_RXCHSTA1    (0x38)
+        #define SUN4I_SPDIF_RXCHSTA1_CGMSA(v)           ((v) << 8)
+        #define SUN4I_SPDIF_RXCHSTA1_ORISAMFREQ(v)      ((v) << 4)
+        #define SUN4I_SPDIF_RXCHSTA1_SAMWORDLEN(v)      ((v) << 1)
+        #define SUN4I_SPDIF_RXCHSTA1_MAXWORDLEN         BIT(0)
+
+/* Defines for Sampling Frequency */
+#define SUN4I_SPDIF_SAMFREQ_44_1KHZ             0x0
+#define SUN4I_SPDIF_SAMFREQ_NOT_INDICATED       0x1
+#define SUN4I_SPDIF_SAMFREQ_48KHZ               0x2
+#define SUN4I_SPDIF_SAMFREQ_32KHZ               0x3
+#define SUN4I_SPDIF_SAMFREQ_22_05KHZ            0x4
+#define SUN4I_SPDIF_SAMFREQ_24KHZ               0x6
+#define SUN4I_SPDIF_SAMFREQ_88_2KHZ             0x8
+#define SUN4I_SPDIF_SAMFREQ_76_8KHZ             0x9
+#define SUN4I_SPDIF_SAMFREQ_96KHZ               0xa
+#define SUN4I_SPDIF_SAMFREQ_176_4KHZ            0xc
+#define SUN4I_SPDIF_SAMFREQ_192KHZ              0xe
+
+struct sun4i_spdif_dev {
+        struct platform_device *pdev;
+        struct clk *spdif_clk;
+        struct clk *apb_clk;
+        struct snd_soc_dai_driver cpu_dai_drv;
+        struct regmap *regmap;
+        struct snd_dmaengine_dai_dma_data dma_params_tx;
+};
+
+static void sun4i_spdif_configure(struct sun4i_spdif_dev *host)
+{
+        /* soft reset SPDIF */
+        regmap_write(host->regmap, SUN4I_SPDIF_CTL, SUN4I_SPDIF_CTL_RESET);
+
+        /* flush TX FIFO */