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authorEduardo Valentin <eduardo.valentin@nokia.com>2009-08-20 16:18:10 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-08-20 20:10:26 +0100
commit7aa9ff56cae7a6a4fa2e1a503cc5f8bbd887d6e3 (patch)
treea23d22ca7825c35a76f7e52bda742bba051550ab
parent44a6311c0a83f682bcf18fae389a1b270df29314 (diff)
downloadlinux-linaro-precise-7aa9ff56cae7a6a4fa2e1a503cc5f8bbd887d6e3.tar.gz
OMAP: McBSP: Add transmit/receive threshold handler
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>
-rw-r--r--arch/arm/plat-omap/include/mach/mcbsp.h9
-rw-r--r--arch/arm/plat-omap/mcbsp.c50
2 files changed, 59 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
index ceaf9eee61b..2544aa5bccd 100644
--- a/arch/arm/plat-omap/include/mach/mcbsp.h
+++ b/arch/arm/plat-omap/include/mach/mcbsp.h
@@ -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);
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index e9dd70320f7..081f2eace92 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -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().