ARM: OMAP2/3: PRM: add SoC reset functions (using the CORE DPLL method)

Add SoC reset functions into the PRM code.  These functions are based
on code from mach-omap2/prcm.c.  They reset the SoC using the CORE DPLL
reset method (as opposed to one of the other two or three chip reset
methods).

Adding them here will facilitate their removal from
arch/arm/mach-omap2/prcm.c.  (prcm.c is deprecated.)

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Tested-by: Vaibhav Hiremath <hvaibhav@ti.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/prm2xxx.c b/arch/arm/mach-omap2/prm2xxx.c
index e2860f9c111d..1f777bf2bc8f 100644
--- a/arch/arm/mach-omap2/prm2xxx.c
+++ b/arch/arm/mach-omap2/prm2xxx.c
@@ -69,6 +69,20 @@ static u32 omap2xxx_prm_read_reset_sources(void)
         return r;
 }
 
+/**
+ * omap2xxx_prm_dpll_reset - use DPLL reset to reboot the OMAP SoC
+ *
+ * Set the DPLL reset bit, which should reboot the SoC.  This is the
+ * recommended way to restart the SoC.  No return value.
+ */
+void omap2xxx_prm_dpll_reset(void)
+{
+        omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, WKUP_MOD,
+                                   OMAP2_RM_RSTCTRL);
+        /* OCP barrier */
+        omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTCTRL);
+}
+
 int omap2xxx_clkdm_sleep(struct clockdomain *clkdm)
 {
         omap2_prm_set_mod_reg_bits(OMAP24XX_FORCESTATE_MASK,