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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /arch/arm/mach-omap2/clkt2xxx_dpll.c
Initial import
Diffstat (limited to 'arch/arm/mach-omap2/clkt2xxx_dpll.c')
-rw-r--r--arch/arm/mach-omap2/clkt2xxx_dpll.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/clkt2xxx_dpll.c b/arch/arm/mach-omap2/clkt2xxx_dpll.c
new file mode 100644
index 000000000..82572e277
--- /dev/null
+++ b/arch/arm/mach-omap2/clkt2xxx_dpll.c
@@ -0,0 +1,59 @@
+/*
+ * OMAP2-specific DPLL control functions
+ *
+ * Copyright (C) 2011 Nokia Corporation
+ * Paul Walmsley
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include "clock.h"
+#include "cm2xxx.h"
+#include "cm-regbits-24xx.h"
+
+/* Private functions */
+
+/**
+ * _allow_idle - enable DPLL autoidle bits
+ * @clk: struct clk * of the DPLL to operate on
+ *
+ * Enable DPLL automatic idle control. The DPLL will enter low-power
+ * stop when its downstream clocks are gated. No return value.
+ * REVISIT: DPLL can optionally enter low-power bypass by writing 0x1
+ * instead. Add some mechanism to optionally enter this mode.
+ */
+static void _allow_idle(struct clk_hw_omap *clk)
+{
+ if (!clk || !clk->dpll_data)
+ return;
+
+ omap2xxx_cm_set_dpll_auto_low_power_stop();
+}
+
+/**
+ * _deny_idle - prevent DPLL from automatically idling
+ * @clk: struct clk * of the DPLL to operate on
+ *
+ * Disable DPLL automatic idle control. No return value.
+ */
+static void _deny_idle(struct clk_hw_omap *clk)
+{
+ if (!clk || !clk->dpll_data)
+ return;
+
+ omap2xxx_cm_set_dpll_disable_autoidle();
+}
+
+
+/* Public data */
+const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll = {
+ .allow_idle = _allow_idle,
+ .deny_idle = _deny_idle,
+};