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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 /arch/arm/mach-omap2/powerdomain.c
parent71ee297a9bc69748510179f5333a3f4541c27723 (diff)
downloadop-kernel-dev-90dbc7b0b80725afd7ed52f18e541dbc671dfd70.zip
op-kernel-dev-90dbc7b0b80725afd7ed52f18e541dbc671dfd70.tar.gz
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>
Diffstat (limited to 'arch/arm/mach-omap2/powerdomain.c')
-rw-r--r--arch/arm/mach-omap2/powerdomain.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/powerdomain.c b/arch/arm/mach-omap2/powerdomain.c
index 4a91d38d..f9f0bca 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
*
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