--- /dev/null
+/*
+ * Copyright 2011 Freescale Semiconductor, Inc.
+ *
+ * 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.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/delay.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "mxs-saif.h"
+
+#define MXS_SET_ADDR 0x4
+#define MXS_CLR_ADDR 0x8
+
+static struct mxs_saif *mxs_saif[2];
+
+/*
+ * SAIF is a little different with other normal SOC DAIs on clock using.
+ *
+ * For MXS, two SAIF modules are instantiated on-chip.
+ * Each SAIF has a set of clock pins and can be operating in master
+ * mode simultaneously if they are connected to different off-chip codecs.
+ * Also, one of the two SAIFs can master or drive the clock pins while the
+ * other SAIF, in slave mode, receives clocking from the master SAIF.
+ * This also means that both SAIFs must operate at the same sample rate.
+ *
+ * We abstract this as each saif has a master, the master could be
+ * itself or other saifs. In the generic saif driver, saif does not need
+ * to know the different clkmux. Saif only needs to know who is its master
+ * and operating its master to generate the proper clock rate for it.
+ * The master id is provided in mach-specific layer according to different
+ * clkmux setting.
+ */
+
+static int mxs_saif_set_dai_sysclk(struct snd_soc_dai *cpu_dai,
+ int clk_id, unsigned int freq, int dir)
+{
+ struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+
+ switch (clk_id) {
+ case MXS_SAIF_MCLK:
+ saif->mclk = freq;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/*
+ * Since SAIF may work on EXTMASTER mode, IOW, it's working BITCLK&LRCLK
+ * is provided by other SAIF, we provide a interface here to get its master
+ * from its master_id.
+ * Note that the master could be itself.
+ */
+static inline struct mxs_saif *mxs_saif_get_master(struct mxs_saif * saif)
+{
+ return mxs_saif[saif->master_id];
+}
+
+/*
+ * Set SAIF clock and MCLK
+ */
+static int mxs_saif_set_clk(struct mxs_saif *saif,
+ unsigned int mclk,
+ unsigned int rate)
+{
+ u32 scr;
+ int ret;
+ struct mxs_saif *master_saif;
+
+ dev_dbg(saif->dev, "mclk %d rate %d\n", mclk, rate);
+
+ /* Set master saif to generate proper clock */
+ master_saif = mxs_saif_get_master(saif);
+ if (!master_saif)
+ return -EINVAL;
+
+ dev_dbg(saif->dev, "master saif%d\n", master_saif->id);
+
+ /* Checking if can playback and capture simutaneously */
+ if (master_saif->ongoing && rate != master_saif->cur_rate) {
+ dev_err(saif->dev,
+ "can not change clock, master saif%d(rate %d) is ongoing\n",
+ master_saif->id, master_saif->cur_rate);
+ return -EINVAL;
+ }
+
+ scr = __raw_readl(master_saif->base + SAIF_CTRL);
+ scr &= ~BM_SAIF_CTRL_BITCLK_MULT_RATE;
+ scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
+
+ /*
+ * Set SAIF clock
+ *
+ * The SAIF clock should be either 384*fs or 512*fs.
+ * If MCLK is used, the SAIF clk ratio need to match mclk ratio.
+ * For 32x mclk, set saif clk as 512*fs.
+ * For 48x mclk, set saif clk as 384*fs.
+ *
+ * If MCLK is not used, we just set saif clk to 512*fs.
+ */
+ clk_prepare_enable(master_saif->clk);
+
+ if (master_saif->mclk_in_use) {
+ if (mclk % 32 == 0) {
+ scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
+ ret = clk_set_rate(master_saif->clk, 512 * rate);
+ } else if (mclk % 48 == 0) {
+ scr |= BM_SAIF_CTRL_BITCLK_BASE_RATE;
+ ret = clk_set_rate(master_saif->clk, 384 * rate);
+ } else {
+ /* SAIF MCLK should be either 32x or 48x */
+ clk_disable_unprepare(master_saif->clk);
+ return -EINVAL;
+ }
+ } else {
+ ret = clk_set_rate(master_saif->clk, 512 * rate);
+ scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
+ }
+
+ clk_disable_unprepare(master_saif->clk);
+
+ if (ret)
+ return ret;
+
+ master_saif->cur_rate = rate;
+
+ if (!master_saif->mclk_in_use) {
+ __raw_writel(scr, master_saif->base + SAIF_CTRL);
+ return 0;
+ }
+
+ /*
+ * Program the over-sample rate for MCLK output
+ *
+ * The available MCLK range is 32x, 48x... 512x. The rate
+ * could be from 8kHz to 192kH.
+ */
+ switch (mclk / rate) {
+ case 32:
+ scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(4);
+ break;
+ case 64:
+ scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3);
+ break;
+ case 128:
+ scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2);
+ break;
+ case 256:
+ scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1);
+ break;
+ case 512:
+ scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0);
+ break;
+ case 48:
+ scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(3);
+ break;
+ case 96:
+ scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(2);
+ break;
+ case 192:
+ scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(1);
+ break;
+ case 384:
+ scr |= BF_SAIF_CTRL_BITCLK_MULT_RATE(0);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ __raw_writel(scr, master_saif->base + SAIF_CTRL);
+
+ return 0;
+}
+
+/*
+ * Put and disable MCLK.
+ */
+int mxs_saif_put_mclk(unsigned int saif_id)
+{
+ struct mxs_saif *saif = mxs_saif[saif_id];
+ u32 stat;
+
+ if (!saif)
+ return -EINVAL;
+
+ stat = __raw_readl(saif->base + SAIF_STAT);
+ if (stat & BM_SAIF_STAT_BUSY) {
+ dev_err(saif->dev, "error: busy\n");
+ return -EBUSY;
+ }
+
+ clk_disable_unprepare(saif->clk);
+
+ /* disable MCLK output */
+ __raw_writel(BM_SAIF_CTRL_CLKGATE,
+ saif->base + SAIF_CTRL + MXS_SET_ADDR);
+ __raw_writel(BM_SAIF_CTRL_RUN,
+ saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+ saif->mclk_in_use = 0;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mxs_saif_put_mclk);
+
+/*
+ * Get MCLK and set clock rate, then enable it
+ *
+ * This interface is used for codecs who are using MCLK provided
+ * by saif.
+ */
+int mxs_saif_get_mclk(unsigned int saif_id, unsigned int mclk,
+ unsigned int rate)
+{
+ struct mxs_saif *saif = mxs_saif[saif_id];
+ u32 stat;
+ int ret;
+ struct mxs_saif *master_saif;
+
+ if (!saif)
+ return -EINVAL;
+
+ /* Clear Reset */
+ __raw_writel(BM_SAIF_CTRL_SFTRST,
+ saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+ /* FIXME: need clear clk gate for register r/w */
+ __raw_writel(BM_SAIF_CTRL_CLKGATE,
+ saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+ master_saif = mxs_saif_get_master(saif);
+ if (saif != master_saif) {
+ dev_err(saif->dev, "can not get mclk from a non-master saif\n");
+ return -EINVAL;
+ }
+
+ stat = __raw_readl(saif->base + SAIF_STAT);
+ if (stat & BM_SAIF_STAT_BUSY) {
+ dev_err(saif->dev, "error: busy\n");
+ return -EBUSY;
+ }
+
+ saif->mclk_in_use = 1;
+ ret = mxs_saif_set_clk(saif, mclk, rate);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(saif->clk);
+ if (ret)
+ return ret;
+
+ /* enable MCLK output */
+ __raw_writel(BM_SAIF_CTRL_RUN,
+ saif->base + SAIF_CTRL + MXS_SET_ADDR);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(mxs_saif_get_mclk);
+
+/*
+ * SAIF DAI format configuration.
+ * Should only be called when port is inactive.
+ */
+static int mxs_saif_set_dai_fmt(struct snd_soc_dai *cpu_dai, unsigned int fmt)
+{
+ u32 scr, stat;
+ u32 scr0;
+ struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+
+ stat = __raw_readl(saif->base + SAIF_STAT);
+ if (stat & BM_SAIF_STAT_BUSY) {
+ dev_err(cpu_dai->dev, "error: busy\n");
+ return -EBUSY;
+ }
+
+ scr0 = __raw_readl(saif->base + SAIF_CTRL);
+ scr0 = scr0 & ~BM_SAIF_CTRL_BITCLK_EDGE & ~BM_SAIF_CTRL_LRCLK_POLARITY \
+ & ~BM_SAIF_CTRL_JUSTIFY & ~BM_SAIF_CTRL_DELAY;
+ scr = 0;
+
+ /* DAI mode */
+ switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
+ case SND_SOC_DAIFMT_I2S:
+ /* data frame low 1clk before data */
+ scr |= BM_SAIF_CTRL_DELAY;
+ scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
+ break;
+ case SND_SOC_DAIFMT_LEFT_J:
+ /* data frame high with data */
+ scr &= ~BM_SAIF_CTRL_DELAY;
+ scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
+ scr &= ~BM_SAIF_CTRL_JUSTIFY;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* DAI clock inversion */
+ switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+ case SND_SOC_DAIFMT_IB_IF:
+ scr |= BM_SAIF_CTRL_BITCLK_EDGE;
+ scr |= BM_SAIF_CTRL_LRCLK_POLARITY;
+ break;
+ case SND_SOC_DAIFMT_IB_NF:
+ scr |= BM_SAIF_CTRL_BITCLK_EDGE;
+ scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
+ break;
+ case SND_SOC_DAIFMT_NB_IF:
+ scr &= ~BM_SAIF_CTRL_BITCLK_EDGE;
+ scr |= BM_SAIF_CTRL_LRCLK_POLARITY;
+ break;
+ case SND_SOC_DAIFMT_NB_NF:
+ scr &= ~BM_SAIF_CTRL_BITCLK_EDGE;
+ scr &= ~BM_SAIF_CTRL_LRCLK_POLARITY;
+ break;
+ }
+
+ /*
+ * Note: We simply just support master mode since SAIF TX can only
+ * work as master.
+ * Here the master is relative to codec side.
+ * Saif internally could be slave when working on EXTMASTER mode.
+ * We just hide this to machine driver.
+ */
+ switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+ case SND_SOC_DAIFMT_CBS_CFS:
+ if (saif->id == saif->master_id)
+ scr &= ~BM_SAIF_CTRL_SLAVE_MODE;
+ else
+ scr |= BM_SAIF_CTRL_SLAVE_MODE;
+
+ __raw_writel(scr | scr0, saif->base + SAIF_CTRL);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int mxs_saif_startup(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+
+ /* clear error status to 0 for each re-open */
+ saif->fifo_underrun = 0;
+ saif->fifo_overrun = 0;
+
+ /* Clear Reset for normal operations */
+ __raw_writel(BM_SAIF_CTRL_SFTRST,
+ saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+ /* clear clock gate */
+ __raw_writel(BM_SAIF_CTRL_CLKGATE,
+ saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+
+ return 0;
+}
+
+/*
+ * Should only be called when port is inactive.
+ * although can be called multiple times by upper layers.
+ */
+static int mxs_saif_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+ struct mxs_saif *master_saif;
+ u32 scr, stat;
+ int ret;
+
+ master_saif = mxs_saif_get_master(saif);
+ if (!master_saif)
+ return -EINVAL;
+
+ /* mclk should already be set */
+ if (!saif->mclk && saif->mclk_in_use) {
+ dev_err(cpu_dai->dev, "set mclk first\n");
+ return -EINVAL;
+ }
+
+ stat = __raw_readl(saif->base + SAIF_STAT);
+ if (stat & BM_SAIF_STAT_BUSY) {
+ dev_err(cpu_dai->dev, "error: busy\n");
+ return -EBUSY;
+ }
+
+ /*
+ * Set saif clk based on sample rate.
+ * If mclk is used, we also set mclk, if not, saif->mclk is
+ * default 0, means not used.
+ */
+ ret = mxs_saif_set_clk(saif, saif->mclk, params_rate(params));
+ if (ret) {
+ dev_err(cpu_dai->dev, "unable to get proper clk\n");
+ return ret;
+ }
+
+ /* prepare clk in hw_param, enable in trigger */
+ clk_prepare(saif->clk);
+ if (saif != master_saif) {
+ /*
+ * Set an initial clock rate for the saif internal logic to work
+ * properly. This is important when working in EXTMASTER mode
+ * that uses the other saif's BITCLK&LRCLK but it still needs a
+ * basic clock which should be fast enough for the internal
+ * logic.
+ */
+ clk_enable(saif->clk);
+ ret = clk_set_rate(saif->clk, 24000000);
+ clk_disable(saif->clk);
+ if (ret)
+ return ret;
+
+ clk_prepare(master_saif->clk);
+ }
+
+ scr = __raw_readl(saif->base + SAIF_CTRL);
+
+ scr &= ~BM_SAIF_CTRL_WORD_LENGTH;
+ scr &= ~BM_SAIF_CTRL_BITCLK_48XFS_ENABLE;
+ switch (params_format(params)) {
+ case SNDRV_PCM_FORMAT_S16_LE:
+ scr |= BF_SAIF_CTRL_WORD_LENGTH(0);
+ break;
+ case SNDRV_PCM_FORMAT_S20_3LE:
+ scr |= BF_SAIF_CTRL_WORD_LENGTH(4);
+ scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE;
+ break;
+ case SNDRV_PCM_FORMAT_S24_LE:
+ scr |= BF_SAIF_CTRL_WORD_LENGTH(8);
+ scr |= BM_SAIF_CTRL_BITCLK_48XFS_ENABLE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Tx/Rx config */
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ /* enable TX mode */
+ scr &= ~BM_SAIF_CTRL_READ_MODE;
+ } else {
+ /* enable RX mode */
+ scr |= BM_SAIF_CTRL_READ_MODE;
+ }
+
+ __raw_writel(scr, saif->base + SAIF_CTRL);
+ return 0;
+}
+
+static int mxs_saif_prepare(struct snd_pcm_substream *substream,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+
+ /* enable FIFO error irqs */
+ __raw_writel(BM_SAIF_CTRL_FIFO_ERROR_IRQ_EN,
+ saif->base + SAIF_CTRL + MXS_SET_ADDR);
+
+ return 0;
+}
+
+static int mxs_saif_trigger(struct snd_pcm_substream *substream, int cmd,
+ struct snd_soc_dai *cpu_dai)
+{
+ struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+ struct mxs_saif *master_saif;
+ u32 delay;
+ int ret;
+
+ master_saif = mxs_saif_get_master(saif);
+ if (!master_saif)
+ return -EINVAL;
+
+ switch (cmd) {
+ case SNDRV_PCM_TRIGGER_START:
+ case SNDRV_PCM_TRIGGER_RESUME:
+ case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+ if (saif->state == MXS_SAIF_STATE_RUNNING)
+ return 0;
+
+ dev_dbg(cpu_dai->dev, "start\n");
+
+ ret = clk_enable(master_saif->clk);
+ if (ret) {
+ dev_err(saif->dev, "Failed to enable master clock\n");
+ return ret;
+ }
+
+ /*
+ * If the saif's master is not itself, we also need to enable
+ * itself clk for its internal basic logic to work.
+ */
+ if (saif != master_saif) {
+ ret = clk_enable(saif->clk);
+ if (ret) {
+ dev_err(saif->dev, "Failed to enable master clock\n");
+ clk_disable(master_saif->clk);
+ return ret;
+ }
+
+ __raw_writel(BM_SAIF_CTRL_RUN,
+ saif->base + SAIF_CTRL + MXS_SET_ADDR);
+ }
+
+ if (!master_saif->mclk_in_use)
+ __raw_writel(BM_SAIF_CTRL_RUN,
+ master_saif->base + SAIF_CTRL + MXS_SET_ADDR);
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ /*
+ * write data to saif data register to trigger
+ * the transfer.
+ * For 24-bit format the 32-bit FIFO register stores
+ * only one channel, so we need to write twice.
+ * This is also safe for the other non 24-bit formats.
+ */
+ __raw_writel(0, saif->base + SAIF_DATA);
+ __raw_writel(0, saif->base + SAIF_DATA);
+ } else {
+ /*
+ * read data from saif data register to trigger
+ * the receive.
+ * For 24-bit format the 32-bit FIFO register stores
+ * only one channel, so we need to read twice.
+ * This is also safe for the other non 24-bit formats.
+ */
+ __raw_readl(saif->base + SAIF_DATA);
+ __raw_readl(saif->base + SAIF_DATA);
+ }
+
+ master_saif->ongoing = 1;
+ saif->state = MXS_SAIF_STATE_RUNNING;
+
+ dev_dbg(saif->dev, "CTRL 0x%x STAT 0x%x\n",
+ __raw_readl(saif->base + SAIF_CTRL),
+ __raw_readl(saif->base + SAIF_STAT));
+
+ dev_dbg(master_saif->dev, "CTRL 0x%x STAT 0x%x\n",
+ __raw_readl(master_saif->base + SAIF_CTRL),
+ __raw_readl(master_saif->base + SAIF_STAT));
+ break;
+ case SNDRV_PCM_TRIGGER_SUSPEND:
+ case SNDRV_PCM_TRIGGER_STOP:
+ case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+ if (saif->state == MXS_SAIF_STATE_STOPPED)
+ return 0;
+
+ dev_dbg(cpu_dai->dev, "stop\n");
+
+ /* wait a while for the current sample to complete */
+ delay = USEC_PER_SEC / master_saif->cur_rate;
+
+ if (!master_saif->mclk_in_use) {
+ __raw_writel(BM_SAIF_CTRL_RUN,
+ master_saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+ udelay(delay);
+ }
+ clk_disable(master_saif->clk);
+
+ if (saif != master_saif) {
+ __raw_writel(BM_SAIF_CTRL_RUN,
+ saif->base + SAIF_CTRL + MXS_CLR_ADDR);
+ udelay(delay);
+ clk_disable(saif->clk);
+ }
+
+ master_saif->ongoing = 0;
+ saif->state = MXS_SAIF_STATE_STOPPED;
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+#define MXS_SAIF_RATES SNDRV_PCM_RATE_8000_192000
+#define MXS_SAIF_FORMATS \
+ (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE | \
+ SNDRV_PCM_FMTBIT_S24_LE)
+
+static const struct snd_soc_dai_ops mxs_saif_dai_ops = {
+ .startup = mxs_saif_startup,
+ .trigger = mxs_saif_trigger,
+ .prepare = mxs_saif_prepare,
+ .hw_params = mxs_saif_hw_params,
+ .set_sysclk = mxs_saif_set_dai_sysclk,
+ .set_fmt = mxs_saif_set_dai_fmt,
+};
+
+static int mxs_saif_dai_probe(struct snd_soc_dai *dai)
+{
+ struct mxs_saif *saif = dev_get_drvdata(dai->dev);
+
+ snd_soc_dai_set_drvdata(dai, saif);
+
+ return 0;
+}
+
+static struct snd_soc_dai_driver mxs_saif_dai = {
+ .name = "mxs-saif",
+ .probe = mxs_saif_dai_probe,
+ .playback = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = MXS_SAIF_RATES,
+ .formats = MXS_SAIF_FORMATS,
+ },
+ .capture = {
+ .channels_min = 2,
+ .channels_max = 2,
+ .rates = MXS_SAIF_RATES,
+ .formats = MXS_SAIF_FORMATS,
+ },
+ .ops = &mxs_saif_dai_ops,
+};
+
+static const struct snd_soc_component_driver mxs_saif_component = {
+ .name = "mxs-saif",
+};
+
+static irqreturn_t mxs_saif_irq(int irq, void *dev_id)
+{
+ struct mxs_saif *saif = dev_id;
+ unsigned int stat;
+
+ stat = __raw_readl(saif->base + SAIF_STAT);
+ if (!(stat & (BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ |
+ BM_SAIF_STAT_FIFO_OVERFLOW_IRQ)))
+ return IRQ_NONE;
+
+ if (stat & BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ) {
+ dev_dbg(saif->dev, "underrun!!! %d\n", ++saif->fifo_underrun);
+ __raw_writel(BM_SAIF_STAT_FIFO_UNDERFLOW_IRQ,
+ saif->base + SAIF_STAT + MXS_CLR_ADDR);
+ }
+
+ if (stat & BM_SAIF_STAT_FIFO_OVERFLOW_IRQ) {
+ dev_dbg(saif->dev, "overrun!!! %d\n", ++saif->fifo_overrun);
+ __raw_writel(BM_SAIF_STAT_FIFO_OVERFLOW_IRQ,
+ saif->base + SAIF_STAT + MXS_CLR_ADDR);
+ }
+
+ dev_dbg(saif->dev, "SAIF_CTRL %x SAIF_STAT %x\n",
+ __raw_readl(saif->base + SAIF_CTRL),
+ __raw_readl(saif->base + SAIF_STAT));
+
+ return IRQ_HANDLED;
+}
+
+static int mxs_saif_mclk_init(struct platform_device *pdev)
+{
+ struct mxs_saif *saif = platform_get_drvdata(pdev);
+ struct device_node *np = pdev->dev.of_node;
+ struct clk *clk;
+ int ret;
+
+ clk = clk_register_divider(&pdev->dev, "mxs_saif_mclk",
+ __clk_get_name(saif->clk), 0,
+ saif->base + SAIF_CTRL,
+ BP_SAIF_CTRL_BITCLK_MULT_RATE, 3,
+ 0, NULL);
+ if (IS_ERR(clk)) {
+ ret = PTR_ERR(clk);
+ if (ret == -EEXIST)
+ return 0;
+ dev_err(&pdev->dev, "failed to register mclk: %d\n", ret);
+ return PTR_ERR(clk);
+ }
+
+ ret = of_clk_add_provider(np, of_clk_src_simple_get, clk);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int mxs_saif_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct resource *iores;
+ struct mxs_saif *saif;
+ int irq, ret = 0;
+ struct device_node *master;
+
+ if (!np)
+ return -EINVAL;
+
+ saif = devm_kzalloc(&pdev->dev, sizeof(*saif), GFP_KERNEL);
+ if (!saif)
+ return -ENOMEM;
+
+ ret = of_alias_get_id(np, "saif");
+ if (ret < 0)
+ return ret;
+ else
+ saif->id = ret;
+
+ /*
+ * If there is no "fsl,saif-master" phandle, it's a saif
+ * master. Otherwise, it's a slave and its phandle points
+ * to the master.
+ */
+ master = of_parse_phandle(np, "fsl,saif-master", 0);
+ if (!master) {
+ saif->master_id = saif->id;
+ } else {
+ ret = of_alias_get_id(master, "saif");
+ if (ret < 0)
+ return ret;
+ else
+ saif->master_id = ret;
+ }
+
+ if (saif->master_id >= ARRAY_SIZE(mxs_saif)) {
+ dev_err(&pdev->dev, "get wrong master id\n");
+ return -EINVAL;
+ }
+
+ mxs_saif[saif->id] = saif;
+
+ saif->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(saif->clk)) {
+ ret = PTR_ERR(saif->clk);
+ dev_err(&pdev->dev, "Cannot get the clock: %d\n",
+ ret);
+ return ret;
+ }
+
+ iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+ saif->base = devm_ioremap_resource(&pdev->dev, iores);
+ if (IS_ERR(saif->base))
+ return PTR_ERR(saif->base);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0) {
+ ret = irq;
+ dev_err(&pdev->dev, "failed to get irq resource: %d\n",
+ ret);
+ return ret;
+ }
+
+ saif->dev = &pdev->dev;
+ ret = devm_request_irq(&pdev->dev, irq, mxs_saif_irq, 0,
+ dev_name(&pdev->dev), saif);
+ if (ret) {
+ dev_err(&pdev->dev, "failed to request irq\n");
+ return ret;
+ }
+
+ platform_set_drvdata(pdev, saif);
+
+ /* We only support saif0 being tx and clock master */
+ if (saif->id == 0) {
+ ret = mxs_saif_mclk_init(pdev);
+ if (ret)
+ dev_warn(&pdev->dev, "failed to init clocks\n");
+ }
+
+ ret = devm_snd_soc_register_component(&pdev->dev, &mxs_saif_component,
+ &mxs_saif_dai, 1);
+ if (ret) {
+ dev_err(&pdev->dev, "register DAI failed\n");
+ return ret;
+ }
+
+ ret = mxs_pcm_platform_register(&pdev->dev);
+ if (ret) {
+ dev_err(&pdev->dev, "register PCM failed: %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static const struct of_device_id mxs_saif_dt_ids[] = {
+ { .compatible = "fsl,imx28-saif", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mxs_saif_dt_ids);
+
+static struct platform_driver mxs_saif_driver = {
+ .probe = mxs_saif_probe,
+
+ .driver = {
+ .name = "mxs-saif",
+ .of_match_table = mxs_saif_dt_ids,
+ },
+};
+
+module_platform_driver(mxs_saif_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("MXS ASoC SAIF driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:mxs-saif");
Code Review / kvmfornfv.git / blobdiff