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authorJarkko Nikula <jhnikula@gmail.com>2011-09-26 10:45:44 +0300
committerTony Lindgren <tony@atomide.com>2011-09-26 17:48:27 -0700
commit1743d14fb6b428e52a9a0917d11d6eba9a110002 (patch)
tree88bdb1d289fff1da1dc6f1d4a76a971fa0db53c4
parentac6747ca0d2e01ed55281d1cc95b5dc646735a20 (diff)
ARM: OMAP: mcbsp: Move sidetone clock management to mach-omap2/mcbsp.c
Active sidetone requires that McBSP interface clock doesn't idle and there is no mechanism in hwmod to turn autoidling on/off in runtime. McBSP2 and 3 in OMAP34xx share their interface clock with McBSP sidetone module and that interface clock must be active when the sidetone is operating. Sidetone has its own autoidle bit which should keep the interface clock active but it is broken. Putting the McBSP core to no-idle mode when the sidetone is active is no good either since it results to higher power consumption when using the threshold based DMA transfers. For making the McBSP code more generic, move this sidetone clock management with fixme comments to mach-omap2/mcbsp.c and pass pointer to it via platform data. Signed-off-by: Jarkko Nikula <jhnikula@gmail.com> Cc: Paul Wamsley <paul@pwsan.com> Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Tested-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl> Signed-off-by: Tony Lindgren <tony@atomide.com>
-rw-r--r--arch/arm/mach-omap2/mcbsp.c26
-rw-r--r--arch/arm/plat-omap/include/plat/mcbsp.h1
-rw-r--r--arch/arm/plat-omap/mcbsp.c18
3 files changed, 31 insertions, 14 deletions
diff --git a/arch/arm/mach-omap2/mcbsp.c b/arch/arm/mach-omap2/mcbsp.c
index d6cce00a730b..92bd5e22a24e 100644
--- a/arch/arm/mach-omap2/mcbsp.c
+++ b/arch/arm/mach-omap2/mcbsp.c
@@ -27,6 +27,13 @@
#include "control.h"
+/*
+ * FIXME: Find a mechanism to enable/disable runtime the McBSP ICLK autoidle.
+ * Sidetone needs non-gated ICLK and sidetone autoidle is broken.
+ */
+#include "cm2xxx_3xxx.h"
+#include "cm-regbits-34xx.h"
+
/* McBSP internal signal muxing functions */
void omap2_mcbsp1_mux_clkr_src(u8 mux)
@@ -102,6 +109,24 @@ int omap2_mcbsp_set_clks_src(u8 id, u8 fck_src_id)
}
EXPORT_SYMBOL(omap2_mcbsp_set_clks_src);
+static int omap3_enable_st_clock(unsigned int id, bool enable)
+{
+ unsigned int w;
+
+ /*
+ * Sidetone uses McBSP ICLK - which must not idle when sidetones
+ * are enabled or sidetones start sounding ugly.
+ */
+ w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
+ if (enable)
+ w &= ~(1 << (id - 2));
+ else
+ w |= 1 << (id - 2);
+ omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
+
+ return 0;
+}
+
struct omap_device_pm_latency omap2_mcbsp_latency[] = {
{
.deactivate_func = omap_device_idle_hwmods,
@@ -151,6 +176,7 @@ static int omap_init_mcbsp(struct omap_hwmod *oh, void *unused)
if (oh->dev_attr) {
oh_device[1] = omap_hwmod_lookup((
(struct omap_mcbsp_dev_attr *)(oh->dev_attr))->sidetone);
+ pdata->enable_st_clock = omap3_enable_st_clock;
count++;
}
pdev = omap_device_build_ss(name, id, oh_device, count, pdata,
diff --git a/arch/arm/plat-omap/include/plat/mcbsp.h b/arch/arm/plat-omap/include/plat/mcbsp.h
index 648344a89a94..e451a6e8b065 100644
--- a/arch/arm/plat-omap/include/plat/mcbsp.h
+++ b/arch/arm/plat-omap/include/plat/mcbsp.h
@@ -321,6 +321,7 @@ struct omap_mcbsp_platform_data {
/* McBSP platform and instance specific features */
bool has_wakeup; /* Wakeup capability */
bool has_ccr; /* Transceiver has configuration control registers */
+ int (*enable_st_clock)(unsigned int, bool);
};
struct omap_mcbsp_st_data {
diff --git a/arch/arm/plat-omap/mcbsp.c b/arch/arm/plat-omap/mcbsp.c
index 3ad536ea6c37..e96d747fbd80 100644
--- a/arch/arm/plat-omap/mcbsp.c
+++ b/arch/arm/plat-omap/mcbsp.c
@@ -26,10 +26,6 @@
#include <plat/mcbsp.h>
#include <linux/pm_runtime.h>
-/* XXX These "sideways" includes are a sign that something is wrong */
-#include "../mach-omap2/cm2xxx_3xxx.h"
-#include "../mach-omap2/cm-regbits-34xx.h"
-
struct omap_mcbsp **mcbsp_ptr;
int omap_mcbsp_count;
@@ -257,13 +253,8 @@ 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 = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
- w &= ~(1 << (mcbsp->id - 2));
- omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
+ if (mcbsp->pdata->enable_st_clock)
+ mcbsp->pdata->enable_st_clock(mcbsp->id, 1);
/* Enable McBSP Sidetone */
w = MCBSP_READ(mcbsp, SSELCR);
@@ -284,9 +275,8 @@ static void omap_st_off(struct omap_mcbsp *mcbsp)
w = MCBSP_READ(mcbsp, SSELCR);
MCBSP_WRITE(mcbsp, SSELCR, w & ~(SIDETONEEN));
- w = omap2_cm_read_mod_reg(OMAP3430_PER_MOD, CM_AUTOIDLE);
- w |= 1 << (mcbsp->id - 2);
- omap2_cm_write_mod_reg(w, OMAP3430_PER_MOD, CM_AUTOIDLE);
+ if (mcbsp->pdata->enable_st_clock)
+ mcbsp->pdata->enable_st_clock(mcbsp->id, 0);
}
static void omap_st_fir_write(struct omap_mcbsp *mcbsp, s16 *fir)