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openwrtv4/target/linux/ramips/patches-4.4/0048-asoc-add-mt7620-support.patch
Michael Lee 9ff8928bb9 ramips: improve i2s drivers 
* remove mt7620-wm8960.c use simple card and DTS to do it
* add old chips support
* add 12Mhz refclk setup. this is hard code. need use clock framework
  rewrite it
* add interrupt error status support for debug. default disable it.
  because it cause to many interrupts
* add setup bclk suport not hard code it
* add 24 bits support for mt7628. not verified
* use regmap api to control registers
* add txdma-req/rxdma-req DTS params for DMA use

Signed-off-by: Michael Lee <igvtee@gmail.com>
2016-06-13 22:51:42 +02:00

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From 7f29222b1731e8182ba94a331531dec18865a1e4 Mon Sep 17 00:00:00 2001
From: John Crispin <blogic@openwrt.org>
Date: Sun, 27 Jul 2014 09:31:47 +0100
Subject: [PATCH 48/53] asoc: add mt7620 support
Signed-off-by: John Crispin <blogic@openwrt.org>
---
arch/mips/ralink/of.c | 2 +
sound/soc/Kconfig | 1 +
sound/soc/Makefile | 1 +
sound/soc/ralink/Kconfig | 15 ++
sound/soc/ralink/Makefile | 11 +
sound/soc/ralink/mt7620-i2s.c | 436 ++++++++++++++++++++++++++++++++++++++
sound/soc/ralink/mt7620-wm8960.c | 233 ++++++++++++++++++++
7 files changed, 699 insertions(+)
create mode 100644 sound/soc/ralink/Kconfig
create mode 100644 sound/soc/ralink/Makefile
create mode 100644 sound/soc/ralink/mt7620-i2s.c
create mode 100644 sound/soc/ralink/mt7620-wm8960.c
--- a/arch/mips/ralink/of.c
+++ b/arch/mips/ralink/of.c
@@ -15,6 +15,7 @@
#include <linux/of_fdt.h>
#include <linux/kernel.h>
#include <linux/bootmem.h>
+#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
@@ -26,6 +27,7 @@
#include "common.h"
__iomem void *rt_sysc_membase;
+EXPORT_SYMBOL(rt_sysc_membase);
__iomem void *rt_memc_membase;
__iomem void *plat_of_remap_node(const char *node)
--- a/sound/soc/Kconfig
+++ b/sound/soc/Kconfig
@@ -56,6 +56,7 @@ source "sound/soc/mxs/Kconfig"
source "sound/soc/pxa/Kconfig"
source "sound/soc/qcom/Kconfig"
source "sound/soc/rockchip/Kconfig"
+source "sound/soc/ralink/Kconfig"
source "sound/soc/samsung/Kconfig"
source "sound/soc/sh/Kconfig"
source "sound/soc/sirf/Kconfig"
--- a/sound/soc/Makefile
+++ b/sound/soc/Makefile
@@ -36,6 +36,7 @@ obj-$(CONFIG_SND_SOC) += kirkwood/
obj-$(CONFIG_SND_SOC) += pxa/
obj-$(CONFIG_SND_SOC) += qcom/
obj-$(CONFIG_SND_SOC) += rockchip/
+obj-$(CONFIG_SND_SOC) += ralink/
obj-$(CONFIG_SND_SOC) += samsung/
obj-$(CONFIG_SND_SOC) += sh/
obj-$(CONFIG_SND_SOC) += sirf/
--- /dev/null
+++ b/sound/soc/ralink/Kconfig
@@ -0,0 +1,8 @@
+config SND_RALINK_SOC_I2S
+ depends on RALINK && SND_SOC && !SOC_RT288X
+ select SND_SOC_GENERIC_DMAENGINE_PCM
+ select REGMAP_MMIO
+ tristate "SoC Audio (I2S protocol) for Ralink SoC"
+ help
+ Say Y if you want to use I2S protocol and I2S codec on Ralink/MediaTek
+ based boards.
--- /dev/null
+++ b/sound/soc/ralink/Makefile
@@ -0,0 +1,6 @@
+#
+# Ralink/MediaTek Platform Support
+#
+snd-soc-ralink-i2s-objs := ralink-i2s.o
+
+obj-$(CONFIG_SND_RALINK_SOC_I2S) += snd-soc-ralink-i2s.o
--- /dev/null
+++ b/sound/soc/ralink/ralink-i2s.c
@@ -0,0 +1,965 @@
+/*
+ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
+ * Copyright (C) 2016 Michael Lee <igvtee@gmail.com>
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <linux/debugfs.h>
+#include <linux/of_device.h>
+#include <sound/pcm_params.h>
+#include <sound/dmaengine_pcm.h>
+
+#include <asm/mach-ralink/ralink_regs.h>
+
+#define DRV_NAME "ralink-i2s"
+
+#define I2S_REG_CFG0 0x00
+#define I2S_REG_INT_STATUS 0x04
+#define I2S_REG_INT_EN 0x08
+#define I2S_REG_FF_STATUS 0x0c
+#define I2S_REG_WREG 0x10
+#define I2S_REG_RREG 0x14
+#define I2S_REG_CFG1 0x18
+#define I2S_REG_DIVCMP 0x20
+#define I2S_REG_DIVINT 0x24
+
+/* I2S_REG_CFG0 */
+#define I2S_REG_CFG0_EN BIT(31)
+#define I2S_REG_CFG0_DMA_EN BIT(30)
+#define I2S_REG_CFG0_BYTE_SWAP BIT(28)
+#define I2S_REG_CFG0_TX_EN BIT(24)
+#define I2S_REG_CFG0_RX_EN BIT(20)
+#define I2S_REG_CFG0_SLAVE BIT(16)
+#define I2S_REG_CFG0_RX_THRES 12
+#define I2S_REG_CFG0_TX_THRES 4
+#define I2S_REG_CFG0_THRES_MASK (0xf << I2S_REG_CFG0_RX_THRES) | \
+ (4 << I2S_REG_CFG0_TX_THRES)
+#define I2S_REG_CFG0_DFT_THRES (4 << I2S_REG_CFG0_RX_THRES) | \
+ (4 << I2S_REG_CFG0_TX_THRES)
+/* RT305x */
+#define I2S_REG_CFG0_CLK_DIS BIT(8)
+#define I2S_REG_CFG0_TXCH_SWAP BIT(3)
+#define I2S_REG_CFG0_TXCH1_OFF BIT(2)
+#define I2S_REG_CFG0_TXCH0_OFF BIT(1)
+#define I2S_REG_CFG0_SLAVE_EN BIT(0)
+/* RT3883 */
+#define I2S_REG_CFG0_RXCH_SWAP BIT(11)
+#define I2S_REG_CFG0_RXCH1_OFF BIT(10)
+#define I2S_REG_CFG0_RXCH0_OFF BIT(9)
+#define I2S_REG_CFG0_WS_INV BIT(0)
+/* MT7628 */
+#define I2S_REG_CFG0_FMT_LE BIT(29)
+#define I2S_REG_CFG0_SYS_BE BIT(28)
+#define I2S_REG_CFG0_NORM_24 BIT(18)
+#define I2S_REG_CFG0_DATA_24 BIT(17)
+
+/* I2S_REG_INT_STATUS */
+#define I2S_REG_INT_RX_FAULT BIT(7)
+#define I2S_REG_INT_RX_OVRUN BIT(6)
+#define I2S_REG_INT_RX_UNRUN BIT(5)
+#define I2S_REG_INT_RX_THRES BIT(4)
+#define I2S_REG_INT_TX_FAULT BIT(3)
+#define I2S_REG_INT_TX_OVRUN BIT(2)
+#define I2S_REG_INT_TX_UNRUN BIT(1)
+#define I2S_REG_INT_TX_THRES BIT(0)
+#define I2S_REG_INT_TX_MASK 0xf
+#define I2S_REG_INT_RX_MASK 0xf0
+
+/* I2S_REG_INT_STATUS */
+#define I2S_RX_AVCNT(x) ((x >> 4) & 0xf)
+#define I2S_TX_AVCNT(x) (x & 0xf)
+/* MT7628 */
+#define MT7628_I2S_RX_AVCNT(x) ((x >> 8) & 0x1f)
+#define MT7628_I2S_TX_AVCNT(x) (x & 0x1f)
+
+/* I2S_REG_CFG1 */
+#define I2S_REG_CFG1_LBK BIT(31)
+#define I2S_REG_CFG1_EXTLBK BIT(30)
+/* RT3883 */
+#define I2S_REG_CFG1_LEFT_J BIT(0)
+#define I2S_REG_CFG1_RIGHT_J BIT(1)
+#define I2S_REG_CFG1_FMT_MASK 0x3
+
+/* I2S_REG_DIVCMP */
+#define I2S_REG_DIVCMP_CLKEN BIT(31)
+#define I2S_REG_DIVCMP_DIVCOMP_MASK 0x1ff
+
+/* I2S_REG_DIVINT */
+#define I2S_REG_DIVINT_MASK 0x3ff
+
+/* BCLK dividers */
+#define RALINK_I2S_DIVCMP 0
+#define RALINK_I2S_DIVINT 1
+
+/* FIFO */
+#define RALINK_I2S_FIFO_SIZE 32
+
+/* feature flags */
+#define RALINK_FLAGS_TXONLY BIT(0)
+#define RALINK_FLAGS_LEFT_J BIT(1)
+#define RALINK_FLAGS_RIGHT_J BIT(2)
+#define RALINK_FLAGS_ENDIAN BIT(3)
+#define RALINK_FLAGS_24BIT BIT(4)
+
+#define RALINK_I2S_INT_EN 0
+
+struct ralink_i2s_stats {
+ u32 dmafault;
+ u32 overrun;
+ u32 underrun;
+ u32 belowthres;
+};
+
+struct ralink_i2s {
+ struct device *dev;
+ void __iomem *regs;
+ struct clk *clk;
+ struct regmap *regmap;
+ u32 flags;
+ unsigned int fmt;
+ u16 txdma_req;
+ u16 rxdma_req;
+
+ struct snd_dmaengine_dai_dma_data playback_dma_data;
+ struct snd_dmaengine_dai_dma_data capture_dma_data;
+
+ struct dentry *dbg_dir;
+ struct dentry *dbg_stats;
+ struct ralink_i2s_stats txstats;
+ struct ralink_i2s_stats rxstats;
+};
+
+static void ralink_i2s_dump_regs(struct ralink_i2s *i2s)
+{
+ u32 buf[10];
+ int ret;
+
+ ret = regmap_bulk_read(i2s->regmap, I2S_REG_CFG0,
+ buf, ARRAY_SIZE(buf));
+
+ dev_dbg(i2s->dev, "CFG0: %08x, INTSTAT: %08x, INTEN: %08x, " \
+ "FFSTAT: %08x, WREG: %08x, RREG: %08x, " \
+ "CFG1: %08x, DIVCMP: %08x, DIVINT: %08x\n",
+ buf[0], buf[1], buf[2], buf[3], buf[4],
+ buf[5], buf[6], buf[8], buf[9]);
+}
+
+static int ralink_i2s_set_sysclk(struct snd_soc_dai *dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ return 0;
+}
+
+static int ralink_i2s_set_sys_bclk(struct snd_soc_dai *dai, int width, int rate)
+{
+ struct ralink_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned long clk = clk_get_rate(i2s->clk);
+ int div;
+ uint32_t data;
+
+ /* disable clock at slave mode */
+ if ((i2s->fmt & SND_SOC_DAIFMT_MASTER_MASK) ==
+ SND_SOC_DAIFMT_CBM_CFM) {
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_CLK_DIS,
+ I2S_REG_CFG0_CLK_DIS);
+ return 0;
+ }
+
+ /* FREQOUT = FREQIN / (I2S_CLK_DIV + 1) */
+ div = (clk / rate ) - 1;
+
+ data = rt_sysc_r32(0x30);
+ data &= (0xff << 8);
+ data |= (0x1 << 15) | (div << 8);
+ rt_sysc_w32(data, 0x30);
+
+ /* enable clock */
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0, I2S_REG_CFG0_CLK_DIS, 0);
+
+ dev_dbg(i2s->dev, "clk: %lu, rate: %u, div: %d\n",
+ clk, rate, div);
+
+ return 0;
+}
+
+static int ralink_i2s_set_bclk(struct snd_soc_dai *dai, int width, int rate)
+{
+ struct ralink_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned long clk = clk_get_rate(i2s->clk);
+ int divint, divcomp;
+
+ /* disable clock at slave mode */
+ if ((i2s->fmt & SND_SOC_DAIFMT_MASTER_MASK) ==
+ SND_SOC_DAIFMT_CBM_CFM) {
+ regmap_update_bits(i2s->regmap, I2S_REG_DIVCMP,
+ I2S_REG_DIVCMP_CLKEN, 0);
+ return 0;
+ }
+
+ /* FREQOUT = FREQIN * (1/2) * (1/(DIVINT + DIVCOMP/512)) */
+ clk = clk / (2 * 2 * width);
+ divint = clk / rate;
+ divcomp = ((clk % rate) * 512) / rate;
+
+ if ((divint > I2S_REG_DIVINT_MASK) ||
+ (divcomp > I2S_REG_DIVCMP_DIVCOMP_MASK))
+ return -EINVAL;
+
+ regmap_update_bits(i2s->regmap, I2S_REG_DIVINT,
+ I2S_REG_DIVINT_MASK, divint);
+ regmap_update_bits(i2s->regmap, I2S_REG_DIVCMP,
+ I2S_REG_DIVCMP_DIVCOMP_MASK, divcomp);
+
+ /* enable clock */
+ regmap_update_bits(i2s->regmap, I2S_REG_DIVCMP, I2S_REG_DIVCMP_CLKEN,
+ I2S_REG_DIVCMP_CLKEN);
+
+ dev_dbg(i2s->dev, "clk: %lu, rate: %u, int: %d, comp: %d\n",
+ clk_get_rate(i2s->clk), rate, divint, divcomp);
+
+ return 0;
+}
+
+static int ralink_i2s_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ struct ralink_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned int cfg0 = 0, cfg1 = 0;
+
+ /* set master/slave audio interface */
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBM_CFM:
+ if (i2s->flags & RALINK_FLAGS_TXONLY)
+ cfg0 |= I2S_REG_CFG0_SLAVE_EN;
+ else
+ cfg0 |= I2S_REG_CFG0_SLAVE;
+ break;
+ case SND_SOC_DAIFMT_CBS_CFS:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* interface format */
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ break;
+ case SND_SOC_DAIFMT_RIGHT_J:
+ if (i2s->flags & RALINK_FLAGS_RIGHT_J) {
+ cfg1 |= I2S_REG_CFG1_RIGHT_J;
+ break;
+ }
+ return -EINVAL;
+ case SND_SOC_DAIFMT_LEFT_J:
+ if (i2s->flags & RALINK_FLAGS_LEFT_J) {
+ cfg1 |= I2S_REG_CFG1_LEFT_J;
+ break;
+ }
+ return -EINVAL;
+ default:
+ return -EINVAL;
+ }
+
+ /* clock inversion */
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_NB_NF:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (i2s->flags & RALINK_FLAGS_TXONLY) {
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_SLAVE_EN, cfg0);
+ } else {
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_SLAVE, cfg0);
+ }
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG1,
+ I2S_REG_CFG1_FMT_MASK, cfg1);
+ i2s->fmt = fmt;
+
+ return 0;
+}
+
+static int ralink_i2s_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct ralink_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ if (dai->active)
+ return 0;
+
+ /* setup status interrupt */
+#if (RALINK_I2S_INT_EN)
+ regmap_write(i2s->regmap, I2S_REG_INT_EN, 0xff);
+#else
+ regmap_write(i2s->regmap, I2S_REG_INT_EN, 0x0);
+#endif
+
+ /* enable */
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_EN | I2S_REG_CFG0_DMA_EN |
+ I2S_REG_CFG0_THRES_MASK,
+ I2S_REG_CFG0_EN | I2S_REG_CFG0_DMA_EN |
+ I2S_REG_CFG0_DFT_THRES);
+
+ return 0;
+}
+
+static void ralink_i2s_shutdown(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *dai)
+{
+ struct ralink_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ /* If both streams are stopped, disable module and clock */
+ if (dai->active)
+ return;
+
+ /*
+ * datasheet mention when disable all control regs are cleared
+ * to initial values. need reinit at startup.
+ */
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0, I2S_REG_CFG0_EN, 0);
+}
+
+static int ralink_i2s_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+ struct ralink_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ int width;
+ int ret;
+
+ width = params_width(params);
+ switch (width) {
+ case 16:
+ if (i2s->flags & RALINK_FLAGS_24BIT)
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_DATA_24, 0);
+ break;
+ case 24:
+ if (i2s->flags & RALINK_FLAGS_24BIT) {
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_DATA_24,
+ I2S_REG_CFG0_DATA_24);
+ break;
+ }
+ return -EINVAL;
+ default:
+ return -EINVAL;
+ }
+
+ switch (params_channels(params)) {
+ case 2:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (i2s->flags & RALINK_FLAGS_ENDIAN) {
+ /* system endian */
+#ifdef SNDRV_LITTLE_ENDIAN
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_SYS_BE, 0);
+#else
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_SYS_BE,
+ I2S_REG_CFG0_SYS_BE);
+#endif
+
+ /* data endian */
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ case SNDRV_PCM_FORMAT_S24_LE:
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_FMT_LE,
+ I2S_REG_CFG0_FMT_LE);
+ break;
+ case SNDRV_PCM_FORMAT_S16_BE:
+ case SNDRV_PCM_FORMAT_S24_BE:
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0,
+ I2S_REG_CFG0_FMT_LE, 0);
+ break;
+ default:
+ return -EINVAL;
+ }
+ }
+
+ /* setup bclk rate */
+ if (i2s->flags & RALINK_FLAGS_TXONLY)
+ ret = ralink_i2s_set_sys_bclk(dai, width, params_rate(params));
+ else
+ ret = ralink_i2s_set_bclk(dai, width, params_rate(params));
+
+ return ret;
+}
+
+static int ralink_i2s_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *dai)
+{
+ struct ralink_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+ unsigned int mask, val;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ mask = I2S_REG_CFG0_TX_EN;
+ else
+ mask = I2S_REG_CFG0_RX_EN;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ val = mask;
+ break;
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ val = 0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ regmap_update_bits(i2s->regmap, I2S_REG_CFG0, mask, val);
+
+ return 0;
+}
+
+static void ralink_i2s_init_dma_data(struct ralink_i2s *i2s,
+ struct resource *res)
+{
+ struct snd_dmaengine_dai_dma_data *dma_data;
+
+ /* Playback */
+ dma_data = &i2s->playback_dma_data;
+ dma_data->addr = res->start + I2S_REG_WREG;
+ dma_data->addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ dma_data->maxburst = 1;
+ dma_data->slave_id = i2s->txdma_req;
+
+ if (i2s->flags & RALINK_FLAGS_TXONLY)
+ return;
+
+ /* Capture */
+ dma_data = &i2s->capture_dma_data;
+ dma_data->addr = res->start + I2S_REG_RREG;
+ dma_data->addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ dma_data->maxburst = 1;
+ dma_data->slave_id = i2s->rxdma_req;
+}
+
+static int ralink_i2s_dai_probe(struct snd_soc_dai *dai)
+{
+ struct ralink_i2s *i2s = snd_soc_dai_get_drvdata(dai);
+
+ snd_soc_dai_init_dma_data(dai, &i2s->playback_dma_data,
+ &i2s->capture_dma_data);
+
+ return 0;
+}
+
+static int ralink_i2s_dai_remove(struct snd_soc_dai *dai)
+{
+ return 0;
+}
+
+static const struct snd_soc_dai_ops ralink_i2s_dai_ops = {
+ .set_sysclk = ralink_i2s_set_sysclk,
+ .set_fmt = ralink_i2s_set_fmt,
+ .startup = ralink_i2s_startup,
+ .shutdown = ralink_i2s_shutdown,
+ .hw_params = ralink_i2s_hw_params,
+ .trigger = ralink_i2s_trigger,
+};
+
+static struct snd_soc_dai_driver ralink_i2s_dai = {
+ .name = DRV_NAME,
+ .probe = ralink_i2s_dai_probe,
+ .remove = ralink_i2s_dai_remove,
+ .ops = &ralink_i2s_dai_ops,
+ .capture = {
+ .stream_name = "I2S Capture",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rate_min = 5512,
+ .rate_max = 192000,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .playback = {
+ .stream_name = "I2S Playback",
+ .channels_min = 2,
+ .channels_max = 2,
+ .rate_min = 5512,
+ .rate_max = 192000,
+ .rates = SNDRV_PCM_RATE_CONTINUOUS,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ },
+ .symmetric_rates = 1,
+};
+
+static struct snd_pcm_hardware ralink_pcm_hardware = {
+ .info = SNDRV_PCM_INFO_MMAP |
+ SNDRV_PCM_INFO_MMAP_VALID |
+ SNDRV_PCM_INFO_INTERLEAVED |
+ SNDRV_PCM_INFO_BLOCK_TRANSFER,
+ .formats = SNDRV_PCM_FMTBIT_S16_LE,
+ .channels_min = 2,
+ .channels_max = 2,
+ .period_bytes_min = PAGE_SIZE,
+ .period_bytes_max = PAGE_SIZE * 2,
+ .periods_min = 2,
+ .periods_max = 128,
+ .buffer_bytes_max = 128 * 1024,
+ .fifo_size = RALINK_I2S_FIFO_SIZE,
+};
+
+static const struct snd_dmaengine_pcm_config ralink_dmaengine_pcm_config = {
+ .prepare_slave_config = snd_dmaengine_pcm_prepare_slave_config,
+ .pcm_hardware = &ralink_pcm_hardware,
+ .prealloc_buffer_size = 256 * PAGE_SIZE,
+};
+
+static const struct snd_soc_component_driver ralink_i2s_component = {
+ .name = DRV_NAME,
+};
+
+static bool ralink_i2s_readable_reg(struct device *dev, unsigned int reg)
+{
+ return true;
+}
+
+static bool ralink_i2s_volatile_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case I2S_REG_INT_STATUS:
+ case I2S_REG_FF_STATUS:
+ return true;
+ }
+ return false;
+}
+
+static bool ralink_i2s_writeable_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case I2S_REG_FF_STATUS:
+ case I2S_REG_RREG:
+ return false;
+ }
+ return true;
+}
+
+static const struct regmap_config ralink_i2s_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .writeable_reg = ralink_i2s_writeable_reg,
+ .readable_reg = ralink_i2s_readable_reg,
+ .volatile_reg = ralink_i2s_volatile_reg,
+ .max_register = I2S_REG_DIVINT,
+};
+
+#if (RALINK_I2S_INT_EN)
+static irqreturn_t ralink_i2s_irq(int irq, void *devid)
+{
+ struct ralink_i2s *i2s = devid;
+ u32 status;
+
+ regmap_read(i2s->regmap, I2S_REG_INT_STATUS, &status);
+ if (unlikely(!status))
+ return IRQ_NONE;
+
+ /* tx stats */
+ if (status & I2S_REG_INT_TX_MASK) {
+ if (status & I2S_REG_INT_TX_THRES)
+ i2s->txstats.belowthres++;
+ if (status & I2S_REG_INT_TX_UNRUN)
+ i2s->txstats.underrun++;
+ if (status & I2S_REG_INT_TX_OVRUN)
+ i2s->txstats.overrun++;
+ if (status & I2S_REG_INT_TX_FAULT)
+ i2s->txstats.dmafault++;
+ }
+
+ /* rx stats */
+ if (status & I2S_REG_INT_RX_MASK) {
+ if (status & I2S_REG_INT_RX_THRES)
+ i2s->rxstats.belowthres++;
+ if (status & I2S_REG_INT_RX_UNRUN)
+ i2s->rxstats.underrun++;
+ if (status & I2S_REG_INT_RX_OVRUN)
+ i2s->rxstats.overrun++;
+ if (status & I2S_REG_INT_RX_FAULT)
+ i2s->rxstats.dmafault++;
+ }
+
+ /* clean status bits */
+ regmap_write(i2s->regmap, I2S_REG_INT_STATUS, status);
+
+ return IRQ_HANDLED;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+static int ralink_i2s_stats_show(struct seq_file *s, void *unused)
+{
+ struct ralink_i2s *i2s = s->private;
+
+ seq_printf(s, "tx stats\n");
+ seq_printf(s, "\tbelow threshold\t%u\n", i2s->txstats.belowthres);
+ seq_printf(s, "\tunder run\t%u\n", i2s->txstats.underrun);
+ seq_printf(s, "\tover run\t%u\n", i2s->txstats.overrun);
+ seq_printf(s, "\tdma fault\t%u\n", i2s->txstats.dmafault);
+
+ seq_printf(s, "rx stats\n");
+ seq_printf(s, "\tbelow threshold\t%u\n", i2s->rxstats.belowthres);
+ seq_printf(s, "\tunder run\t%u\n", i2s->rxstats.underrun);
+ seq_printf(s, "\tover run\t%u\n", i2s->rxstats.overrun);
+ seq_printf(s, "\tdma fault\t%u\n", i2s->rxstats.dmafault);
+
+ ralink_i2s_dump_regs(i2s);
+
+ return 0;
+}
+
+static int ralink_i2s_stats_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, ralink_i2s_stats_show, inode->i_private);
+}
+
+static const struct file_operations ralink_i2s_stats_ops = {
+ .open = ralink_i2s_stats_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static inline int ralink_i2s_debugfs_create(struct ralink_i2s *i2s)
+{
+ i2s->dbg_dir = debugfs_create_dir(dev_name(i2s->dev), NULL);
+ if (!i2s->dbg_dir)
+ return -ENOMEM;
+
+ i2s->dbg_stats = debugfs_create_file("stats", S_IRUGO,
+ i2s->dbg_dir, i2s, &ralink_i2s_stats_ops);
+ if (!i2s->dbg_stats) {
+ debugfs_remove(i2s->dbg_dir);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static inline void ralink_i2s_debugfs_remove(struct ralink_i2s *i2s)
+{
+ debugfs_remove(i2s->dbg_stats);
+ debugfs_remove(i2s->dbg_dir);
+}
+#else
+static inline int ralink_i2s_debugfs_create(struct ralink_i2s *i2s)
+{
+ return 0;
+}
+
+static inline void ralink_i2s_debugfs_remove(struct fsl_ssi_dbg *ssi_dbg)
+{
+}
+#endif
+
+/*
+ * TODO: these refclk setup functions should use
+ * clock framework instead. hardcode it now.
+ */
+static void rt3350_refclk_setup(void)
+{
+ uint32_t data;
+
+ /* set refclk output 12Mhz clock */
+ data = rt_sysc_r32(0x2c);
+ data |= (0x1 << 8);
+ rt_sysc_w32(data, 0x2c);
+}
+
+static void rt3883_refclk_setup(void)
+{
+ uint32_t data;
+
+ /* set refclk output 12Mhz clock */
+ data = rt_sysc_r32(0x2c);
+ data &= ~(0x3 << 13);
+ data |= (0x1 << 13);
+ rt_sysc_w32(data, 0x2c);
+}
+
+static void rt3552_refclk_setup(void)
+{
+ uint32_t data;
+
+ /* set refclk output 12Mhz clock */
+ data = rt_sysc_r32(0x2c);
+ data &= ~(0xf << 8);
+ data |= (0x3 << 8);
+ rt_sysc_w32(data, 0x2c);
+}
+
+static void mt7620_refclk_setup(void)
+{
+ uint32_t data;
+
+ /* set refclk output 12Mhz clock */
+ data = rt_sysc_r32(0x2c);
+ data &= ~(0x7 << 9);
+ data |= 0x1 << 9;
+ rt_sysc_w32(data, 0x2c);
+}
+
+static void mt7621_refclk_setup(void)
+{
+ uint32_t data;
+
+ /* set refclk output 12Mhz clock */
+ data = rt_sysc_r32(0x2c);
+ data &= ~(0x1f << 18);
+ data |= (0x19 << 18);
+ data &= ~(0x1f << 12);
+ data |= (0x1 << 12);
+ data &= ~(0x7 << 9);
+ data |= (0x5 << 9);
+ rt_sysc_w32(data, 0x2c);
+}
+
+static void mt7628_refclk_setup(void)
+{
+ uint32_t data;
+
+ /* set i2s and refclk digital pad */
+ data = rt_sysc_r32(0x3c);
+ data |= 0x1f;
+ rt_sysc_w32(data, 0x3c);
+
+ /* Adjust REFCLK0's driving strength */
+ data = rt_sysc_r32(0x1354);
+ data &= ~(0x1 << 5);
+ rt_sysc_w32(data, 0x1354);
+ data = rt_sysc_r32(0x1364);
+ data |= ~(0x1 << 5);
+ rt_sysc_w32(data, 0x1364);
+
+ /* set refclk output 12Mhz clock */
+ data = rt_sysc_r32(0x2c);
+ data &= ~(0x7 << 9);
+ data |= 0x1 << 9;
+ rt_sysc_w32(data, 0x2c);
+}
+
+struct rt_i2s_data {
+ u32 flags;
+ void (*refclk_setup)(void);
+};
+
+struct rt_i2s_data rt3050_i2s_data = { .flags = RALINK_FLAGS_TXONLY };
+struct rt_i2s_data rt3350_i2s_data = { .flags = RALINK_FLAGS_TXONLY,
+ .refclk_setup = rt3350_refclk_setup };
+struct rt_i2s_data rt3883_i2s_data = {
+ .flags = (RALINK_FLAGS_LEFT_J | RALINK_FLAGS_RIGHT_J),
+ .refclk_setup = rt3883_refclk_setup };
+struct rt_i2s_data rt3352_i2s_data = { .refclk_setup = rt3552_refclk_setup};
+struct rt_i2s_data mt7620_i2s_data = { .refclk_setup = mt7620_refclk_setup};
+struct rt_i2s_data mt7621_i2s_data = { .refclk_setup = mt7621_refclk_setup};
+struct rt_i2s_data mt7628_i2s_data = {
+ .flags = (RALINK_FLAGS_ENDIAN | RALINK_FLAGS_24BIT |
+ RALINK_FLAGS_LEFT_J),
+ .refclk_setup = mt7628_refclk_setup};
+
+static const struct of_device_id ralink_i2s_match_table[] = {
+ { .compatible = "ralink,rt3050-i2s",
+ .data = (void *)&rt3050_i2s_data },
+ { .compatible = "ralink,rt3350-i2s",
+ .data = (void *)&rt3350_i2s_data },
+ { .compatible = "ralink,rt3883-i2s",
+ .data = (void *)&rt3883_i2s_data },
+ { .compatible = "ralink,rt3352-i2s",
+ .data = (void *)&rt3352_i2s_data },
+ { .compatible = "mediatek,mt7620-i2s",
+ .data = (void *)&mt7620_i2s_data },
+ { .compatible = "mediatek,mt7621-i2s",
+ .data = (void *)&mt7621_i2s_data },
+ { .compatible = "mediatek,mt7628-i2s",
+ .data = (void *)&mt7628_i2s_data },
+};
+MODULE_DEVICE_TABLE(of, ralink_i2s_match_table);
+
+static int ralink_i2s_probe(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+ struct device_node *np = pdev->dev.of_node;
+ struct ralink_i2s *i2s;
+ struct resource *res;
+ int irq, ret;
+ u32 dma_req;
+ struct rt_i2s_data *data;
+
+ i2s = devm_kzalloc(&pdev->dev, sizeof(*i2s), GFP_KERNEL);
+ if (!i2s)
+ return -ENOMEM;
+
+ platform_set_drvdata(pdev, i2s);
+ i2s->dev = &pdev->dev;
+
+ match = of_match_device(ralink_i2s_match_table, &pdev->dev);
+ if (!match)
+ return -EINVAL;
+ data = (struct rt_i2s_data *)match->data;
+ i2s->flags = data->flags;
+ /* setup out 12Mhz refclk to codec as mclk */
+ if (data->refclk_setup)
+ data->refclk_setup();
+
+ if (of_property_read_u32(np, "txdma-req", &dma_req)) {
+ dev_err(&pdev->dev, "no txdma-req define\n");
+ return -EINVAL;
+ }
+ i2s->txdma_req = (u16)dma_req;
+ if (!(i2s->flags & RALINK_FLAGS_TXONLY)) {
+ if (of_property_read_u32(np, "rxdma-req", &dma_req)) {
+ dev_err(&pdev->dev, "no rxdma-req define\n");
+ return -EINVAL;
+ }
+ i2s->rxdma_req = (u16)dma_req;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ i2s->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(i2s->regs))
+ return PTR_ERR(i2s->regs);
+
+ i2s->regmap = devm_regmap_init_mmio(&pdev->dev, i2s->regs,
+ &ralink_i2s_regmap_config);
+ if (IS_ERR(i2s->regmap)) {
+ dev_err(&pdev->dev, "regmap init failed\n");
+ return PTR_ERR(i2s->regmap);
+ }
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ dev_err(&pdev->dev, "failed to get irq\n");
+ return -EINVAL;
+ }
+
+#if (RALINK_I2S_INT_EN)
+ ret = devm_request_irq(&pdev->dev, irq, ralink_i2s_irq,
+ 0, dev_name(&pdev->dev), i2s);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ return ret;
+ }
+#endif
+
+ i2s->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(i2s->clk)) {
+ dev_err(&pdev->dev, "no clock defined\n");
+ return PTR_ERR(i2s->clk);
+ }
+
+ ret = clk_prepare_enable(i2s->clk);
+ if (ret)
+ return ret;
+
+ ralink_i2s_init_dma_data(i2s, res);
+
+ device_reset(&pdev->dev);
+
+ ret = ralink_i2s_debugfs_create(i2s);
+ if (ret) {
+ dev_err(&pdev->dev, "create debugfs failed\n");
+ goto err_clk_disable;
+ }
+
+ /* enable 24bits support */
+ if (i2s->flags & RALINK_FLAGS_24BIT) {
+ ralink_i2s_dai.capture.formats |= SNDRV_PCM_FMTBIT_S24_LE;
+ ralink_i2s_dai.playback.formats |= SNDRV_PCM_FMTBIT_S24_LE;
+ }
+
+ /* enable big endian support */
+ if (i2s->flags & RALINK_FLAGS_ENDIAN) {
+ ralink_i2s_dai.capture.formats |= SNDRV_PCM_FMTBIT_S16_BE;
+ ralink_i2s_dai.playback.formats |= SNDRV_PCM_FMTBIT_S16_BE;
+ ralink_pcm_hardware.formats |= SNDRV_PCM_FMTBIT_S16_BE;
+ if (i2s->flags & RALINK_FLAGS_24BIT) {
+ ralink_i2s_dai.capture.formats |=
+ SNDRV_PCM_FMTBIT_S24_BE;
+ ralink_i2s_dai.playback.formats |=
+ SNDRV_PCM_FMTBIT_S24_BE;
+ ralink_pcm_hardware.formats |=
+ SNDRV_PCM_FMTBIT_S24_BE;
+ }
+ }
+
+ /* disable capture support */
+ if (i2s->flags & RALINK_FLAGS_TXONLY)
+ memset(&ralink_i2s_dai.capture, sizeof(ralink_i2s_dai.capture),
+ 0);
+
+ ret = devm_snd_soc_register_component(&pdev->dev, &ralink_i2s_component,
+ &ralink_i2s_dai, 1);
+ if (ret)
+ goto err_debugfs;
+
+ ret = devm_snd_dmaengine_pcm_register(&pdev->dev,
+ &ralink_dmaengine_pcm_config,
+ SND_DMAENGINE_PCM_FLAG_COMPAT);
+ if (ret)
+ goto err_debugfs;
+
+ dev_info(i2s->dev, "mclk %luKHz\n", clk_get_rate(i2s->clk) / 1000000);
+
+ return 0;
+
+err_debugfs:
+ ralink_i2s_debugfs_remove(i2s);
+
+err_clk_disable:
+ clk_disable_unprepare(i2s->clk);
+
+ return ret;
+}
+
+static int ralink_i2s_remove(struct platform_device *pdev)
+{
+ struct ralink_i2s *i2s = platform_get_drvdata(pdev);
+
+ ralink_i2s_debugfs_remove(i2s);
+ clk_disable_unprepare(i2s->clk);
+
+ return 0;
+}
+
+static struct platform_driver ralink_i2s_driver = {
+ .probe = ralink_i2s_probe,
+ .remove = ralink_i2s_remove,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = ralink_i2s_match_table,
+ },
+};
+module_platform_driver(ralink_i2s_driver);
+
+MODULE_AUTHOR("Lars-Peter Clausen, <lars@metafoo.de>");
+MODULE_DESCRIPTION("Ralink/MediaTek I2S driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
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