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authorEero Nurkkala <ext-eero.nurkkala@nokia.com>2009-08-20 16:18:15 +0300
committerMark Brown <broonie@opensource.wolfsonmicro.com>2009-08-20 20:10:27 +0100
commit2122fdc629f05634537e796c0630028e4db76953 (patch)
tree08f4d6f4a71e88cc7d93763e725c0892aa41df54
parent98cb20e88957faf9c99e194242caac7f55dd47e4 (diff)
downloadlinux-linaro-precise-2122fdc629f05634537e796c0630028e4db76953.tar.gz
OMAP: McBSP: Wakeups utilized
This patch enables the smart idle mode while McBPS is being utilized. Once it's done, force idle mode is taken instead. Apart of it, it also configures what signals will wake mcbsp up. Signed-off-by: Eero Nurkkala <ext-eero.nurkkala@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>
-rw-r--r--arch/arm/plat-omap/include/mach/mcbsp.h17
-rw-r--r--arch/arm/plat-omap/mcbsp.c46
2 files changed, 63 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/include/mach/mcbsp.h b/arch/arm/plat-omap/include/mach/mcbsp.h
index bd5b759991c..333061d4f4a 100644
--- a/arch/arm/plat-omap/include/mach/mcbsp.h
+++ b/arch/arm/plat-omap/include/mach/mcbsp.h
@@ -138,6 +138,7 @@
#define OMAP_MCBSP_REG_THRSH1 0x94
#define OMAP_MCBSP_REG_IRQST 0xA0
#define OMAP_MCBSP_REG_IRQEN 0xA4
+#define OMAP_MCBSP_REG_WAKEUPEN 0xA8
#define OMAP_MCBSP_REG_XCCR 0xAC
#define OMAP_MCBSP_REG_RCCR 0xB0
@@ -253,6 +254,8 @@
#define RDISABLE 0x0001
/********************** McBSP SYSCONFIG bit definitions ********************/
+#define SIDLEMODE(value) ((value)<<3)
+#define ENAWAKEUP 0x0004
#define SOFTRST 0x0002
/********************** McBSP DMA operating modes **************************/
@@ -260,6 +263,20 @@
#define MCBSP_DMA_MODE_THRESHOLD 1
#define MCBSP_DMA_MODE_FRAME 2
+/********************** McBSP WAKEUPEN bit definitions *********************/
+#define XEMPTYEOFEN 0x4000
+#define XRDYEN 0x0400
+#define XEOFEN 0x0200
+#define XFSXEN 0x0100
+#define XSYNCERREN 0x0080
+#define RRDYEN 0x0008
+#define REOFEN 0x0004
+#define RFSREN 0x0002
+#define RSYNCERREN 0x0001
+#define WAKEUPEN_ALL (XEMPTYEOFEN | XRDYEN | XEOFEN | XFSXEN | \
+ XSYNCERREN | RRDYEN | REOFEN | RFSREN | \
+ RSYNCERREN)
+
/* we don't do multichannel for now */
struct omap_mcbsp_reg_cfg {
u16 spcr2;
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 9e699947a69..136f8c5d0da 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -305,6 +305,46 @@ int omap_mcbsp_get_dma_op_mode(unsigned int id)
return dma_op_mode;
}
EXPORT_SYMBOL(omap_mcbsp_get_dma_op_mode);
+
+static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp)
+{
+ /*
+ * Enable wakup behavior, smart idle and all wakeups
+ * REVISIT: some wakeups may be unnecessary
+ */
+ if (cpu_is_omap34xx()) {
+ u16 syscon;
+
+ syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
+ syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03));
+ syscon |= (ENAWAKEUP | SIDLEMODE(0x02));
+ OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
+
+ OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, WAKEUPEN_ALL);
+ }
+}
+
+static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp)
+{
+ /*
+ * Disable wakup behavior, smart idle and all wakeups
+ */
+ if (cpu_is_omap34xx()) {
+ u16 syscon;
+ u16 wakeupen;
+
+ syscon = OMAP_MCBSP_READ(mcbsp->io_base, SYSCON);
+ syscon &= ~(ENAWAKEUP | SIDLEMODE(0x03));
+ OMAP_MCBSP_WRITE(mcbsp->io_base, SYSCON, syscon);
+
+ wakeupen = OMAP_MCBSP_READ(mcbsp->io_base, WAKEUPEN);
+ wakeupen &= ~WAKEUPEN_ALL;
+ OMAP_MCBSP_WRITE(mcbsp->io_base, WAKEUPEN, wakeupen);
+ }
+}
+#else
+static inline void omap34xx_mcbsp_request(struct omap_mcbsp *mcbsp) {}
+static inline void omap34xx_mcbsp_free(struct omap_mcbsp *mcbsp) {}
#endif
/*
@@ -366,6 +406,9 @@ int omap_mcbsp_request(unsigned int id)
clk_enable(mcbsp->iclk);
clk_enable(mcbsp->fclk);
+ /* Do procedure specific to omap34xx arch, if applicable */
+ omap34xx_mcbsp_request(mcbsp);
+
/*
* Make sure that transmitter, receiver and sample-rate generator are
* not running before activating IRQs.
@@ -414,6 +457,9 @@ void omap_mcbsp_free(unsigned int id)
if (mcbsp->pdata && mcbsp->pdata->ops && mcbsp->pdata->ops->free)
mcbsp->pdata->ops->free(id);
+ /* Do procedure specific to omap34xx arch, if applicable */
+ omap34xx_mcbsp_free(mcbsp);
+
clk_disable(mcbsp->fclk);
clk_disable(mcbsp->iclk);