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OMAP: McBSP: Add transmit/receive threshold handler

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This patch adds a way to handle transmit/receive threshold.
It export to mcbsp users a callback registration procedure.

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:
Eduardo Valentin 2009-08-20 16:18:10 +03:00 committed by Mark Brown
parent 44a6311c0a
commit 7aa9ff56ca
2 changed files with 59 additions and 0 deletions
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9
arch/arm/plat-omap/include/mach/mcbsp.h
View File

@ -389,6 +389,15 @@ int omap_mcbsp_init(void);
void omap_mcbsp_register_board_cfg(struct omap_mcbsp_platform_data *config,
int size);
void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg * config);
#ifdef CONFIG_ARCH_OMAP34XX
void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold);
void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold);
#else
static inline void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold)
{ }
static inline void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
{ }
#endif
int omap_mcbsp_request(unsigned int id);
void omap_mcbsp_free(unsigned int id);
void omap_mcbsp_start(unsigned int id, int tx, int rx);

50
arch/arm/plat-omap/mcbsp.c
View File

@ -198,6 +198,56 @@ void omap_mcbsp_config(unsigned int id, const struct omap_mcbsp_reg_cfg *config)
}
EXPORT_SYMBOL(omap_mcbsp_config);
#ifdef CONFIG_ARCH_OMAP34XX
/*
* omap_mcbsp_set_tx_threshold configures how to deal
* with transmit threshold. the threshold value and handler can be
* configure in here.
*/
void omap_mcbsp_set_tx_threshold(unsigned int id, u16 threshold)
{
struct omap_mcbsp *mcbsp;
void __iomem *io_base;
if (!cpu_is_omap34xx())
return;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return;
}
mcbsp = id_to_mcbsp_ptr(id);
io_base = mcbsp->io_base;
OMAP_MCBSP_WRITE(io_base, THRSH2, threshold);
}
EXPORT_SYMBOL(omap_mcbsp_set_tx_threshold);
/*
* omap_mcbsp_set_rx_threshold configures how to deal
* with receive threshold. the threshold value and handler can be
* configure in here.
*/
void omap_mcbsp_set_rx_threshold(unsigned int id, u16 threshold)
{
struct omap_mcbsp *mcbsp;
void __iomem *io_base;
if (!cpu_is_omap34xx())
return;
if (!omap_mcbsp_check_valid_id(id)) {
printk(KERN_ERR "%s: Invalid id (%d)\n", __func__, id + 1);
return;
}
mcbsp = id_to_mcbsp_ptr(id);
io_base = mcbsp->io_base;
OMAP_MCBSP_WRITE(io_base, THRSH1, threshold);
}
EXPORT_SYMBOL(omap_mcbsp_set_rx_threshold);
#endif
/*
* We can choose between IRQ based or polled IO.
* This needs to be called before omap_mcbsp_request().