#include <linux/dma-mapping.h>
#include <linux/clk.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 <sound/saif.h>
#include <mach/dma.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
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
+ * himself or other saifs. In the generic saif driver, saif does not need
+ * to know the different clkmux. Saif only needs to know who is his master
+ * and operating his master to generate the proper clock rate for him.
+ * 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)
{
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 himself.
+ */
+static inline struct mxs_saif *mxs_saif_get_master(struct mxs_saif * saif)
+{
+ return mxs_saif[saif->master_id];
+}
+
/*
* Set SAIF clock and MCLK
*/
{
u32 scr;
int ret;
+ struct mxs_saif *master_saif;
- scr = __raw_readl(saif->base + SAIF_CTRL);
+ 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;
*
* If MCLK is not used, we just set saif clk to 512*fs.
*/
- if (saif->mclk_in_use) {
+ if (master_saif->mclk_in_use) {
if (mclk % 32 == 0) {
scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
- ret = clk_set_rate(saif->clk, 512 * 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(saif->clk, 384 * rate);
+ ret = clk_set_rate(master_saif->clk, 384 * rate);
} else {
/* SAIF MCLK should be either 32x or 48x */
return -EINVAL;
}
} else {
- ret = clk_set_rate(saif->clk, 512 * rate);
+ ret = clk_set_rate(master_saif->clk, 512 * rate);
scr &= ~BM_SAIF_CTRL_BITCLK_BASE_RATE;
}
if (ret)
return ret;
- if (!saif->mclk_in_use) {
- __raw_writel(scr, saif->base + SAIF_CTRL);
+ master_saif->cur_rate = rate;
+
+ if (!master_saif->mclk_in_use) {
+ __raw_writel(scr, master_saif->base + SAIF_CTRL);
return 0;
}
return -EINVAL;
}
- __raw_writel(scr, saif->base + SAIF_CTRL);
+ __raw_writel(scr, master_saif->base + SAIF_CTRL);
return 0;
}
struct mxs_saif *saif = mxs_saif[saif_id];
u32 stat;
int ret;
+ struct mxs_saif *master_saif;
if (!saif)
return -EINVAL;
__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");
/*
* 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:
- scr &= ~BM_SAIF_CTRL_SLAVE_MODE;
+ 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:
struct snd_soc_dai *cpu_dai)
{
struct mxs_saif *saif = snd_soc_dai_get_drvdata(cpu_dai);
+ struct mxs_saif *master_saif;
+ u32 delay;
+
+ master_saif = mxs_saif_get_master(saif);
+ if (!master_saif)
+ return -EINVAL;
switch (cmd) {
case SNDRV_PCM_TRIGGER_START:
case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
dev_dbg(cpu_dai->dev, "start\n");
- clk_enable(saif->clk);
- if (!saif->mclk_in_use)
+ clk_enable(master_saif->clk);
+ if (!master_saif->mclk_in_use)
+ __raw_writel(BM_SAIF_CTRL_RUN,
+ master_saif->base + SAIF_CTRL + MXS_SET_ADDR);
+
+ /*
+ * If the saif's master is not himself, we also need to enable
+ * itself clk for its internal basic logic to work.
+ */
+ if (saif != master_saif) {
+ clk_enable(saif->clk);
__raw_writel(BM_SAIF_CTRL_RUN,
saif->base + SAIF_CTRL + MXS_SET_ADDR);
+ }
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
/*
__raw_readl(saif->base + SAIF_DATA);
}
- dev_dbg(cpu_dai->dev, "CTRL 0x%x STAT 0x%x\n",
+ master_saif->ongoing = 1;
+
+ 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:
dev_dbg(cpu_dai->dev, "stop\n");
- clk_disable(saif->clk);
- if (!saif->mclk_in_use)
+ /* 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;
break;
default:
{
struct resource *res;
struct mxs_saif *saif;
+ struct mxs_saif_platform_data *pdata;
int ret = 0;
if (pdev->id >= ARRAY_SIZE(mxs_saif))
return -EINVAL;
+ pdata = pdev->dev.platform_data;
+ if (pdata && pdata->init) {
+ ret = pdata->init();
+ if (ret)
+ return ret;
+ }
+
saif = kzalloc(sizeof(*saif), GFP_KERNEL);
if (!saif)
return -ENOMEM;
mxs_saif[pdev->id] = saif;
+ saif->id = pdev->id;
+
+ saif->master_id = saif->id;
+ if (pdata && pdata->get_master_id) {
+ saif->master_id = pdata->get_master_id(saif->id);
+ if (saif->master_id < 0 ||
+ saif->master_id >= ARRAY_SIZE(mxs_saif))
+ return -EINVAL;
+ }
saif->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(saif->clk)) {
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