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authorRajendra Nayak <rnayak@ti.com>2010-05-18 20:24:03 -0600
committerPaul Walmsley <paul@pwsan.com>2010-05-20 12:31:13 -0600
commit90dbc7b0b80725afd7ed52f18e541dbc671dfd70 (patch)
treecc4627d059e2102434b16d623b4fff3b9032776c
parent71ee297a9bc69748510179f5333a3f4541c27723 (diff)
OMAP4 powerdomain: Support LOWPOWERSTATECHANGE for powerdomains
Some powerdomains in OMAP4 support a direct transition from one sleep state to another deeper sleep state without having to wakeup the powerdomain. This patch adds an api in the powerdomain framework to set the LOWPOWERSTATECHANGE bit in PWRSTCTRL register. Signed-off-by: Rajendra Nayak <rnayak@ti.com> Signed-off-by: Paul Walmsley <paul@pwsan.com>
-rw-r--r--arch/arm/mach-omap2/powerdomain.c28
-rw-r--r--arch/arm/mach-omap2/powerdomains44xx.h9
-rw-r--r--arch/arm/plat-omap/include/plat/powerdomain.h6
3 files changed, 43 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 4a91d38d7b1a..f9f0bca1926a 100644
--- a/arch/arm/mach-omap2/powerdomain.c
+++ b/arch/arm/mach-omap2/powerdomain.c
@@ -980,6 +980,34 @@ bool pwrdm_has_hdwr_sar(struct powerdomain *pwrdm)
}
/**
+ * pwrdm_set_lowpwrstchange - Request a low power state change
+ * @pwrdm: struct powerdomain *
+ *
+ * Allows a powerdomain to transtion to a lower power sleep state
+ * from an existing sleep state without waking up the powerdomain.
+ * Returns -EINVAL if the powerdomain pointer is null or if the
+ * powerdomain does not support LOWPOWERSTATECHANGE, or returns 0
+ * upon success.
+ */
+int pwrdm_set_lowpwrstchange(struct powerdomain *pwrdm)
+{
+ if (!pwrdm)
+ return -EINVAL;
+
+ if (!(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE))
+ return -EINVAL;
+
+ pr_debug("powerdomain: %s: setting LOWPOWERSTATECHANGE bit\n",
+ pwrdm->name);
+
+ prm_rmw_mod_reg_bits(OMAP4430_LOWPOWERSTATECHANGE_MASK,
+ (1 << OMAP4430_LOWPOWERSTATECHANGE_SHIFT),
+ pwrdm->prcm_offs, pwrstctrl_reg_offs);
+
+ return 0;
+}
+
+/**
* pwrdm_wait_transition - wait for powerdomain power transition to finish
* @pwrdm: struct powerdomain * to wait for
*
diff --git a/arch/arm/mach-omap2/powerdomains44xx.h b/arch/arm/mach-omap2/powerdomains44xx.h
index ad5a2655ad44..c7219513472a 100644
--- a/arch/arm/mach-omap2/powerdomains44xx.h
+++ b/arch/arm/mach-omap2/powerdomains44xx.h
@@ -54,6 +54,7 @@ static struct powerdomain core_44xx_pwrdm = {
[3] = PWRDM_POWER_ON, /* ducati_l2ram */
[4] = PWRDM_POWER_ON, /* ducati_unicache */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* gfx_44xx_pwrdm: 3D accelerator power domain */
@@ -69,6 +70,7 @@ static struct powerdomain gfx_44xx_pwrdm = {
.pwrsts_mem_on = {
[0] = PWRDM_POWER_ON, /* gfx_mem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* abe_44xx_pwrdm: Audio back end power domain */
@@ -87,6 +89,7 @@ static struct powerdomain abe_44xx_pwrdm = {
[0] = PWRDM_POWER_ON, /* aessmem */
[1] = PWRDM_POWER_ON, /* periphmem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* dss_44xx_pwrdm: Display subsystem power domain */
@@ -103,6 +106,7 @@ static struct powerdomain dss_44xx_pwrdm = {
.pwrsts_mem_on = {
[0] = PWRDM_POWER_ON, /* dss_mem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* tesla_44xx_pwrdm: Tesla processor power domain */
@@ -123,6 +127,7 @@ static struct powerdomain tesla_44xx_pwrdm = {
[1] = PWRDM_POWER_ON, /* tesla_l1 */
[2] = PWRDM_POWER_ON, /* tesla_l2 */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* wkup_44xx_pwrdm: Wake-up power domain */
@@ -227,6 +232,7 @@ static struct powerdomain ivahd_44xx_pwrdm = {
[2] = PWRDM_POWER_ON, /* tcm1_mem */
[3] = PWRDM_POWER_ON, /* tcm2_mem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* cam_44xx_pwrdm: Camera subsystem power domain */
@@ -242,6 +248,7 @@ static struct powerdomain cam_44xx_pwrdm = {
.pwrsts_mem_on = {
[0] = PWRDM_POWER_ON, /* cam_mem */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* l3init_44xx_pwrdm: L3 initators pheripherals power domain */
@@ -258,6 +265,7 @@ static struct powerdomain l3init_44xx_pwrdm = {
.pwrsts_mem_on = {
[0] = PWRDM_POWER_ON, /* l3init_bank1 */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/* l4per_44xx_pwrdm: Target peripherals power domain */
@@ -276,6 +284,7 @@ static struct powerdomain l4per_44xx_pwrdm = {
[0] = PWRDM_POWER_ON, /* nonretained_bank */
[1] = PWRDM_POWER_ON, /* retained_bank */
},
+ .flags = PWRDM_HAS_LOWPOWERSTATECHANGE,
};
/*
diff --git a/arch/arm/plat-omap/include/plat/powerdomain.h b/arch/arm/plat-omap/include/plat/powerdomain.h
index e7cc7e66e977..fb6ec74fe39e 100644
--- a/arch/arm/plat-omap/include/plat/powerdomain.h
+++ b/arch/arm/plat-omap/include/plat/powerdomain.h
@@ -50,6 +50,12 @@
* in MEM bank 1 position. This is
* true for OMAP3430
*/
+#define PWRDM_HAS_LOWPOWERSTATECHANGE (1 << 2) /*
+ * support to transition from a
+ * sleep state to a lower sleep
+ * state without waking up the
+ * powerdomain
+ */
/*
* Number of memory banks that are power-controllable. On OMAP4430, the