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OMAP: McBSP: Add link DMA mode selection 

It adds a new sysfs file, where the user can configure the mcbsp mode to use.
If the mcbsp channel is in use, it does not allow the change.
Than in omap_pcm_open we can call the omap_mcbsp_get_opmode to get the mode,
store it, than use it to implement the different modes.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Eduardo Valentin <eduardo.valentin@nokia.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Peter Ujfalusi 2009-08-20 16:18:14 +03:00 committed by Mark Brown
parent 4c8200aeb0
commit 98cb20e889
2 changed files with 92 additions and 0 deletions
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8
arch/arm/plat-omap/include/mach/mcbsp.h
View File

@ -255,6 +255,11 @@
/********************** McBSP SYSCONFIG bit definitions ********************/
#define SOFTRST 0x0002
/********************** McBSP DMA operating modes **************************/
#define MCBSP_DMA_MODE_ELEMENT 0
#define MCBSP_DMA_MODE_THRESHOLD 1
#define MCBSP_DMA_MODE_FRAME 2
/* we don't do multichannel for now */
struct omap_mcbsp_reg_cfg {
u16 spcr2;
@ -385,6 +390,7 @@ struct omap_mcbsp {
struct clk *iclk;
struct clk *fclk;
#ifdef CONFIG_ARCH_OMAP34XX
int dma_op_mode;
u16 max_tx_thres;
u16 max_rx_thres;
#endif
@ -401,6 +407,7 @@ void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold);
void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold);
u16 omap_mcbsp_get_max_tx_threshold(unsigned int id);
u16 omap_mcbsp_get_max_rx_threshold(unsigned int id);
int omap_mcbsp_get_dma_op_mode(unsigned int id);
#else
static inline void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold)
{ }
@ -408,6 +415,7 @@ static inline void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
{ }
static inline u16 omap_mcbsp_get_max_tx_threshold(unsigned int id) { return 0; }
static inline u16 omap_mcbsp_get_max_rx_threshold(unsigned int id) { return 0; }
static inline int omap_mcbsp_get_dma_op_mode(unsigned int id) { return 0; }
#endif
int omap_mcbsp_request(unsigned int id);
void omap_mcbsp_free(unsigned int id);

84
arch/arm/plat-omap/mcbsp.c
View File

@ -282,6 +282,29 @@ u16 omap_mcbsp_get_max_rx_threshold(unsigned int id)
return mcbsp->max_rx_thres;
}
EXPORT_SYMBOL(omap_mcbsp_get_max_rx_threshold);
/*
* omap_mcbsp_get_dma_op_mode just return the current configured
* operating mode for the mcbsp channel
*/
int omap_mcbsp_get_dma_op_mode(unsigned int id)
{
struct omap_mcbsp *mcbsp;
int dma_op_mode;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%u)\n", __func__, id + 1);
return -ENODEV;
}
mcbsp = id_to_mcbsp_ptr(id);
spin_lock_irq(&mcbsp->lock);
dma_op_mode = mcbsp->dma_op_mode;
spin_unlock_irq(&mcbsp->lock);
return dma_op_mode;
}
EXPORT_SYMBOL(omap_mcbsp_get_dma_op_mode);
#endif
/*
@ -1077,9 +1100,65 @@ static DEVICE_ATTR(prop, 0644, prop##_show, prop##_store);
THRESHOLD_PROP_BUILDER(max_tx_thres);
THRESHOLD_PROP_BUILDER(max_rx_thres);
static ssize_t dma_op_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
int dma_op_mode;
spin_lock_irq(&mcbsp->lock);
dma_op_mode = mcbsp->dma_op_mode;
spin_unlock_irq(&mcbsp->lock);
return sprintf(buf, "current mode: %d\n"
"possible mode values are:\n"
"%d - %s\n"
"%d - %s\n"
"%d - %s\n",
dma_op_mode,
MCBSP_DMA_MODE_ELEMENT, "element mode",
MCBSP_DMA_MODE_THRESHOLD, "threshold mode",
MCBSP_DMA_MODE_FRAME, "frame mode");
}
static ssize_t dma_op_mode_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct omap_mcbsp *mcbsp = dev_get_drvdata(dev);
unsigned long val;
int status;
status = strict_strtoul(buf, 0, &val);
if (status)
return status;
spin_lock_irq(&mcbsp->lock);
if (!mcbsp->free) {
size = -EBUSY;
goto unlock;
}
if (val > MCBSP_DMA_MODE_FRAME || val < MCBSP_DMA_MODE_ELEMENT) {
size = -EINVAL;
goto unlock;
}
mcbsp->dma_op_mode = val;
unlock:
spin_unlock_irq(&mcbsp->lock);
return size;
}
static DEVICE_ATTR(dma_op_mode, 0644, dma_op_mode_show, dma_op_mode_store);
static const struct attribute *additional_attrs[] = {
&dev_attr_max_tx_thres.attr,
&dev_attr_max_rx_thres.attr,
&dev_attr_dma_op_mode.attr,
NULL,
};
@ -1099,9 +1178,14 @@ static inline void __devexit omap_additional_remove(struct device *dev)
static inline void __devinit omap34xx_device_init(struct omap_mcbsp *mcbsp)
{
mcbsp->dma_op_mode = MCBSP_DMA_MODE_ELEMENT;
if (cpu_is_omap34xx()) {
mcbsp->max_tx_thres = max_thres(mcbsp);
mcbsp->max_rx_thres = max_thres(mcbsp);
/*
* REVISIT: Set dmap_op_mode to THRESHOLD as default
* for mcbsp2 instances.
*/
if (omap_additional_add(mcbsp->dev))
dev_warn(mcbsp->dev,
"Unable to create additional controls\n");