McBSP: OMAP3: Add sidetone feature

Add sidetone feature to McBSP instances 2 and 3 on OMAP3 based devices.

Signed-off-by: Ilkka Koskinen <ilkka.koskinen@nokia.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Tested-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 401 insertions, 1 deletions

diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 473be3dc2cf5..e47686e0a633 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -27,6 +27,8 @@
 #include <plat/dma.h>
 #include <plat/mcbsp.h>
 
+#include "../mach-omap2/cm-regbits-34xx.h"
+
 struct omap_mcbsp **mcbsp_ptr;
 int omap_mcbsp_count, omap_mcbsp_cache_size;
 
@@ -58,6 +60,18 @@ int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg, bool from_cache)
 	}
 }
 
+#ifdef CONFIG_ARCH_OMAP3
+void omap_mcbsp_st_write(struct omap_mcbsp *mcbsp, u16 reg, u32 val)
+{
+	__raw_writel(val, mcbsp->st_data->io_base_st + reg);
+}
+
+int omap_mcbsp_st_read(struct omap_mcbsp *mcbsp, u16 reg)
+{
+	return __raw_readl(mcbsp->st_data->io_base_st + reg);
+}
+#endif
+
 #define MCBSP_READ(mcbsp, reg) \
 		omap_mcbsp_read(mcbsp, OMAP_MCBSP_REG_##reg, 0)
 #define MCBSP_WRITE(mcbsp, reg, val) \
@@ -68,6 +82,11 @@ int omap_mcbsp_read(struct omap_mcbsp *mcbsp, u16 reg, bool from_cache)
 #define omap_mcbsp_check_valid_id(id)	(id < omap_mcbsp_count)
 #define id_to_mcbsp_ptr(id)		mcbsp_ptr[id];
 
+#define MCBSP_ST_READ(mcbsp, reg) \
+			omap_mcbsp_st_read(mcbsp, OMAP_ST_REG_##reg)
+#define MCBSP_ST_WRITE(mcbsp, reg, val) \
+			omap_mcbsp_st_write(mcbsp, OMAP_ST_REG_##reg, val)
+
 static void omap_mcbsp_dump_reg(u8 id)
 {
 	struct omap_mcbsp *mcbsp = id_to_mcbsp_ptr(id);
@@ -211,6 +230,257 @@ void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config)
 EXPORT_SYMBOL(omap_mcbsp_config);
 
 #ifdef CONFIG_ARCH_OMAP3
+static void omap_st_on(struct omap_mcbsp *mcbsp)
+{
+	unsigned int w;
+
+	/*
+	 * Sidetone uses McBSP ICLK - which must not idle when sidetones
+	 * are enabled or sidetones start sounding ugly.
+	 */
+	w = cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
+	w &= ~(1 << (mcbsp->id - 2));
+	cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
+
+	/* Enable McBSP Sidetone */
+	w = MCBSP_READ(mcbsp, SSELCR);
+	MCBSP_WRITE(mcbsp, SSELCR, w | SIDETONEEN);
+
+	w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
+	MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w & ~(ST_AUTOIDLE));
+
+	/* Enable Sidetone from Sidetone Core */
+	w = MCBSP_ST_READ(mcbsp, SSELCR);
+	MCBSP_ST_WRITE(mcbsp, SSELCR, w | ST_SIDETONEEN);
+}
+
+static void omap_st_off(struct omap_mcbsp *mcbsp)
+{
+	unsigned int w;
+
+	w = MCBSP_ST_READ(mcbsp, SSELCR);
+	MCBSP_ST_WRITE(mcbsp, SSELCR, w & ~(ST_SIDETONEEN));
+
+	w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
+	MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w | ST_AUTOIDLE);
+
+	w = MCBSP_READ(mcbsp, SSELCR);
+	MCBSP_WRITE(mcbsp, SSELCR, w & ~(SIDETONEEN));
+
+	w = cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
+	w |= 1 << (mcbsp->id - 2);
+	cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
+}
+
+static void omap_st_fir_write(struct omap_mcbsp *mcbsp, s16 *fir)
+{
+	u16 val, i;
+
+	val = MCBSP_ST_READ(mcbsp, SYSCONFIG);
+	MCBSP_ST_WRITE(mcbsp, SYSCONFIG, val & ~(ST_AUTOIDLE));
+
+	val = MCBSP_ST_READ(mcbsp, SSELCR);
+
+	if (val & ST_COEFFWREN)
+		MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
+
+	MCBSP_ST_WRITE(mcbsp, SSELCR, val | ST_COEFFWREN);
+
+	for (i = 0; i < 128; i++)
+		MCBSP_ST_WRITE(mcbsp, SFIRCR, fir[i]);
+
+	i = 0;
+
+	val = MCBSP_ST_READ(mcbsp, SSELCR);
+	while (!(val & ST_COEFFWRDONE) && (++i < 1000))
+		val = MCBSP_ST_READ(mcbsp, SSELCR);
+
+	MCBSP_ST_WRITE(mcbsp, SSELCR, val & ~(ST_COEFFWREN));
+
+	if (i == 1000)
+		dev_err(mcbsp->dev, "McBSP FIR load error!\n");
+}
+
+static void omap_st_chgain(struct omap_mcbsp *mcbsp)
+{
+	u16 w;
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+
+	w = MCBSP_ST_READ(mcbsp, SYSCONFIG);
+	MCBSP_ST_WRITE(mcbsp, SYSCONFIG, w & ~(ST_AUTOIDLE));
+
+	w = MCBSP_ST_READ(mcbsp, SSELCR);
+
+	MCBSP_ST_WRITE(mcbsp, SGAINCR, ST_CH0GAIN(st_data->ch0gain) | \
+		      ST_CH1GAIN(st_data->ch1gain));
+}
+
+int omap_st_set_chgain(unsigned int id, int channel, s16 chgain)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+	int ret = 0;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENOENT;
+
+	spin_lock_irq(&mcbsp->lock);
+	if (channel == 0)
+		st_data->ch0gain = chgain;
+	else if (channel == 1)
+		st_data->ch1gain = chgain;
+	else
+		ret = -EINVAL;
+
+	if (st_data->enabled)
+		omap_st_chgain(mcbsp);
+	spin_unlock_irq(&mcbsp->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(omap_st_set_chgain);
+
+int omap_st_get_chgain(unsigned int id, int channel, s16 *chgain)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+	int ret = 0;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENOENT;
+
+	spin_lock_irq(&mcbsp->lock);
+	if (channel == 0)
+		*chgain = st_data->ch0gain;
+	else if (channel == 1)
+		*chgain = st_data->ch1gain;
+	else
+		ret = -EINVAL;
+	spin_unlock_irq(&mcbsp->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(omap_st_get_chgain);
+
+static int omap_st_start(struct omap_mcbsp *mcbsp)
+{
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+
+	if (st_data && st_data->enabled && !st_data->running) {
+		omap_st_fir_write(mcbsp, st_data->taps);
+		omap_st_chgain(mcbsp);
+
+		if (!mcbsp->free) {
+			omap_st_on(mcbsp);
+			st_data->running = 1;
+		}
+	}
+
+	return 0;
+}
+
+int omap_st_enable(unsigned int id)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENODEV;
+
+	spin_lock_irq(&mcbsp->lock);
+	st_data->enabled = 1;
+	omap_st_start(mcbsp);
+	spin_unlock_irq(&mcbsp->lock);
+
+	return 0;
+}
+EXPORT_SYMBOL(omap_st_enable);
+
+static int omap_st_stop(struct omap_mcbsp *mcbsp)
+{
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+
+	if (st_data && st_data->running) {
+		if (!mcbsp->free) {
+			omap_st_off(mcbsp);
+			st_data->running = 0;
+		}
+	}
+
+	return 0;
+}
+
+int omap_st_disable(unsigned int id)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+	int ret = 0;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENODEV;
+
+	spin_lock_irq(&mcbsp->lock);
+	omap_st_stop(mcbsp);
+	st_data->enabled = 0;
+	spin_unlock_irq(&mcbsp->lock);
+
+	return ret;
+}
+EXPORT_SYMBOL(omap_st_disable);
+
+int omap_st_is_enabled(unsigned int id)
+{
+	struct omap_mcbsp *mcbsp;
+	struct omap_mcbsp_st_data *st_data;
+
+	if (!omap_mcbsp_check_valid_id(id)) {
+		printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
+		return -ENODEV;
+	}
+
+	mcbsp = id_to_mcbsp_ptr(id);
+	st_data = mcbsp->st_data;
+
+	if (!st_data)
+		return -ENODEV;
+
+
+	return st_data->enabled;
+}
+EXPORT_SYMBOL(omap_st_is_enabled);
+
 /*
  * omap_mcbsp_set_tx_threshold configures how to deal
  * with transmit threshold. the threshold value and handler can be
@@ -363,6 +633,8 @@ static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp)
 #else
 static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp) {}
 static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp) {}
+static inline void omap_st_start(struct omap_mcbsp *mcbsp) {}
+static inline void omap_st_stop(struct omap_mcbsp *mcbsp) {}
 #endif
 
 /*
@@ -546,6 +818,9 @@ void omap_mcbsp_start(unsigned int id, int tx, int rx)
 	}
 	mcbsp = id_to_mcbsp_ptr(id);
 
+	if (cpu_is_omap34xx())
+		omap_st_start(mcbsp);
+
 	mcbsp->rx_word_length = (MCBSP_READ_CACHE(mcbsp, RCR1) >> 5) & 0x7;
 	mcbsp->tx_word_length = (MCBSP_READ_CACHE(mcbsp, XCR1) >> 5) & 0x7;
 
@@ -637,6 +912,9 @@ void omap_mcbsp_stop(unsigned int id, int tx, int rx)
 		w = MCBSP_READ_CACHE(mcbsp, SPCR2);
 		MCBSP_WRITE(mcbsp, SPCR2, w & ~(1 << 6));
 	}
+
+	if (cpu_is_omap34xx())
+		omap_st_stop(mcbsp);
 }
 EXPORT_SYMBOL(omap_mcbsp_stop);
 
@@ -1212,6 +1490,64 @@ unlock:
 
 static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
 
+static ssize_t st_taps_show(struct device *dev,
+			    struct device_attribute *attr, char *buf)
+{
+	struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+	ssize_t status = 0;
+	int i;
+
+	spin_lock_irq(&mcbsp->lock);
+	for (i = 0; i < st_data->nr_taps; i++)
+		status += sprintf(&buf[status], (i ? ", %d" : "%d"),
+				  st_data->taps[i]);
+	if (i)
+		status += sprintf(&buf[status], "\n");
+	spin_unlock_irq(&mcbsp->lock);
+
+	return status;
+}
+
+static ssize_t st_taps_store(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t size)
+{
+	struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+	int val, tmp, status, i = 0;
+
+	spin_lock_irq(&mcbsp->lock);
+	memset(st_data->taps, 0, sizeof(st_data->taps));
+	st_data->nr_taps = 0;
+
+	do {
+		status = sscanf(buf, "%d%n", &val, &tmp);
+		if (status < 0 || status == 0) {
+			size = -EINVAL;
+			goto out;
+		}
+		if (val < -32768 || val > 32767) {
+			size = -EINVAL;
+			goto out;
+		}
+		st_data->taps[i++] = val;
+		buf += tmp;
+		if (*buf != ',')
+			break;
+		buf++;
+	} while (1);
+
+	st_data->nr_taps = i;
+
+out:
+	spin_unlock_irq(&mcbsp->lock);
+
+	return size;
+}
+
+static DEVICE_ATTR(st_taps, 0644, st_taps_show, st_taps_store);
+
 static const struct attribute *additional_attrs[] = {
 	&dev_attr_max_tx_thres.attr,
 	&dev_attr_max_rx_thres.attr,
@@ -1233,6 +1569,60 @@ static inline void __devexit omap_additional_remove(struct device *dev)
 	sysfs_remove_group(&dev->kobj, &additional_attr_group);
 }
 
+static const struct attribute *sidetone_attrs[] = {
+	&dev_attr_st_taps.attr,
+	NULL,
+};
+
+static const struct attribute_group sidetone_attr_group = {
+	.attrs = (struct attribute **)sidetone_attrs,
+};
+
+int __devinit omap_st_add(struct omap_mcbsp *mcbsp)
+{
+	struct omap_mcbsp_platform_data *pdata = mcbsp->pdata;
+	struct omap_mcbsp_st_data *st_data;
+	int err;
+
+	st_data = kzalloc(sizeof(*mcbsp->st_data), GFP_KERNEL);
+	if (!st_data) {
+		err = -ENOMEM;
+		goto err1;
+	}
+
+	st_data->io_base_st = ioremap(pdata->phys_base_st, SZ_4K);
+	if (!st_data->io_base_st) {
+		err = -ENOMEM;
+		goto err2;
+	}
+
+	err = sysfs_create_group(&mcbsp->dev->kobj, &sidetone_attr_group);
+	if (err)
+		goto err3;
+
+	mcbsp->st_data = st_data;
+	return 0;
+
+err3:
+	iounmap(st_data->io_base_st);
+err2:
+	kfree(st_data);
+err1:
+	return err;
+
+}
+
+static void __devexit omap_st_remove(struct omap_mcbsp *mcbsp)
+{
+	struct omap_mcbsp_st_data *st_data = mcbsp->st_data;
+
+	if (st_data) {
+		sysfs_remove_group(&mcbsp->dev->kobj, &sidetone_attr_group);
+		iounmap(st_data->io_base_st);
+		kfree(st_data);
+	}
+}
+
 static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
 {
 	mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
@@ -1246,6 +1636,12 @@ static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
 		if (omap_additional_add(mcbsp->dev))
 			dev_warn(mcbsp->dev,
 				"Unable to create additional controls\n");
+
+		if (mcbsp->id == 2 || mcbsp->id == 3)
+			if (omap_st_add(mcbsp))
+				dev_warn(mcbsp->dev,
+				 "Unable to create sidetone controls\n");
+
 	} else {
 		mcbsp->max_tx_thres = -EINVAL;
 		mcbsp->max_rx_thres = -EINVAL;
@@ -1254,8 +1650,12 @@ static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
 
 static inline void __devexit omap34xx_device_exit(struct omap_mcbsp *mcbsp)
 {
-	if (cpu_is_omap34xx())
+	if (cpu_is_omap34xx()) {
 		omap_additional_remove(mcbsp->dev);
+
+		if (mcbsp->id == 2 || mcbsp->id == 3)
+			omap_st_remove(mcbsp);
+	}
 }
 #else
 static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp) {}