diff --git a/arch/arm/mach-mx1/clock.c b/arch/arm/mach-mx1/clock.c
index 4bcd1ec..3c46433 100644
--- a/arch/arm/mach-mx1/clock.c
+++ b/arch/arm/mach-mx1/clock.c
@@ -87,33 +87,6 @@
 	return clk->parent->set_rate(clk->parent, rate);
 }
 
-/*
- *  get the system pll clock in Hz
- *
- *                  mfi + mfn / (mfd +1)
- *  f = 2 * f_ref * --------------------
- *                        pd + 1
- */
-static unsigned long mx1_decode_pll(unsigned int pll, u32 f_ref)
-{
-	unsigned long long ll;
-	unsigned long quot;
-
-	u32 mfi = (pll >> 10) & 0xf;
-	u32 mfn = pll & 0x3ff;
-	u32 mfd = (pll >> 16) & 0x3ff;
-	u32 pd =  (pll >> 26) & 0xf;
-
-	mfi = mfi <= 5 ? 5 : mfi;
-
-	ll = 2 * (unsigned long long)f_ref *
-		((mfi << 16) + (mfn << 16) / (mfd + 1));
-	quot = (pd + 1) * (1 << 16);
-	ll += quot / 2;
-	do_div(ll, quot);
-	return (unsigned long)ll;
-}
-
 static unsigned long clk16m_get_rate(struct clk *clk)
 {
 	return 16000000;
@@ -188,7 +161,7 @@
 
 static unsigned long system_clk_get_rate(struct clk *clk)
 {
-	return mx1_decode_pll(__raw_readl(CCM_SPCTL0),
+	return mxc_decode_pll(__raw_readl(CCM_SPCTL0),
 			      clk_get_rate(clk->parent));
 }
 
@@ -200,7 +173,7 @@
 
 static unsigned long mcu_clk_get_rate(struct clk *clk)
 {
-	return mx1_decode_pll(__raw_readl(CCM_MPCTL0),
+	return mxc_decode_pll(__raw_readl(CCM_MPCTL0),
 			      clk_get_rate(clk->parent));
 }
 
diff --git a/arch/arm/mach-mx2/clock_imx27.c b/arch/arm/mach-mx2/clock_imx27.c
index c69896d..047e71e 100644
--- a/arch/arm/mach-mx2/clock_imx27.c
+++ b/arch/arm/mach-mx2/clock_imx27.c
@@ -486,26 +486,8 @@
 
 static unsigned long get_mpll_clk(struct clk *clk)
 {
-	uint32_t reg;
-	unsigned long ref_clk;
-	unsigned long mfi = 0, mfn = 0, mfd = 0, pdf = 0;
-	unsigned long long temp;
-
-	ref_clk = clk_get_rate(clk->parent);
-
-	reg = __raw_readl(CCM_MPCTL0);
-	pdf = (reg & CCM_MPCTL0_PD_MASK) >> CCM_MPCTL0_PD_OFFSET;
-	mfd = (reg & CCM_MPCTL0_MFD_MASK) >> CCM_MPCTL0_MFD_OFFSET;
-	mfi = (reg & CCM_MPCTL0_MFI_MASK) >> CCM_MPCTL0_MFI_OFFSET;
-	mfn = (reg & CCM_MPCTL0_MFN_MASK) >> CCM_MPCTL0_MFN_OFFSET;
-
-	mfi = (mfi <= 5) ? 5 : mfi;
-	temp = 2LL * ref_clk * mfn;
-	do_div(temp, mfd + 1);
-	temp = 2LL * ref_clk * mfi + temp;
-	do_div(temp, pdf + 1);
-
-	return (unsigned long)temp;
+	return mxc_decode_pll(__raw_readl(CCM_MPCTL0),
+			clk_get_rate(clk->parent));
 }
 
 static struct clk mpll_clk = {
@@ -555,28 +537,18 @@
 {
 	uint32_t reg;
 	unsigned long ref_clk;
-	unsigned long mfi = 0, mfn = 0, mfd = 0, pdf = 0;
-	unsigned long long temp;
 
 	ref_clk = clk_get_rate(clk->parent);
 
 	reg = __raw_readl(CCM_SPCTL0);
-	/*TODO: This is TO2 Bug */
+
+	/* On TO2 we have to write the value back. Otherwise we
+	 * read 0 from this register the next time.
+	 */
 	if (mx27_revision() >= CHIP_REV_2_0)
 		__raw_writel(reg, CCM_SPCTL0);
 
-	pdf = (reg & CCM_SPCTL0_PD_MASK) >> CCM_SPCTL0_PD_OFFSET;
-	mfd = (reg & CCM_SPCTL0_MFD_MASK) >> CCM_SPCTL0_MFD_OFFSET;
-	mfi = (reg & CCM_SPCTL0_MFI_MASK) >> CCM_SPCTL0_MFI_OFFSET;
-	mfn = (reg & CCM_SPCTL0_MFN_MASK) >> CCM_SPCTL0_MFN_OFFSET;
-
-	mfi = (mfi <= 5) ? 5 : mfi;
-	temp = 2LL * ref_clk * mfn;
-	do_div(temp, mfd + 1);
-	temp = 2LL * ref_clk * mfi + temp;
-	do_div(temp, pdf + 1);
-
-	return (unsigned long)temp;
+	return mxc_decode_pll(reg, ref_clk);
 }
 
 static struct clk spll_clk = {
diff --git a/arch/arm/mach-mx3/clock.c b/arch/arm/mach-mx3/clock.c
index b1746aa..8486ea4 100644
--- a/arch/arm/mach-mx3/clock.c
+++ b/arch/arm/mach-mx3/clock.c
@@ -158,10 +158,8 @@
 
 static unsigned long _clk_pll_get_rate(struct clk *clk)
 {
-	long mfi, mfn, mfd, pdf, ref_clk, mfn_abs;
 	unsigned long reg, ccmr;
-	s64 temp;
-	unsigned int prcs;
+	unsigned int prcs, ref_clk;
 
 	ccmr = __raw_readl(MXC_CCM_CCMR);
 	prcs = (ccmr & MXC_CCM_CCMR_PRCS_MASK) >> MXC_CCM_CCMR_PRCS_OFFSET;
@@ -185,27 +183,7 @@
 		return 0;
 	}
 
-	pdf = (reg & MXC_CCM_PCTL_PD_MASK) >> MXC_CCM_PCTL_PD_OFFSET;
-	mfd = (reg & MXC_CCM_PCTL_MFD_MASK) >> MXC_CCM_PCTL_MFD_OFFSET;
-	mfi = (reg & MXC_CCM_PCTL_MFI_MASK) >> MXC_CCM_PCTL_MFI_OFFSET;
-	mfi = (mfi <= 5) ? 5 : mfi;
-	mfn = mfn_abs = reg & MXC_CCM_PCTL_MFN_MASK;
-
-	if (mfn >= 0x200) {
-		mfn |= 0xFFFFFE00;
-		mfn_abs = -mfn;
-	}
-
-	ref_clk *= 2;
-	ref_clk /= pdf + 1;
-
-	temp = (u64) ref_clk * mfn_abs;
-	do_div(temp, mfd + 1);
-	if (mfn < 0)
-		temp = -temp;
-	temp = (ref_clk * mfi) + temp;
-
-	return temp;
+	return mxc_decode_pll(reg, ref_clk);
 }
 
 static int _clk_usb_pll_enable(struct clk *clk)
diff --git a/arch/arm/plat-mxc/clock.c b/arch/arm/plat-mxc/clock.c
index 0a38f0b..888dd33 100644
--- a/arch/arm/plat-mxc/clock.c
+++ b/arch/arm/plat-mxc/clock.c
@@ -328,3 +328,47 @@
 
 late_initcall(mxc_setup_proc_entry);
 #endif
+
+/*
+ * Get the resulting clock rate from a PLL register value and the input
+ * frequency. PLLs with this register layout can at least be found on
+ * MX1, MX21, MX27 and MX31
+ *
+ *                  mfi + mfn / (mfd + 1)
+ *  f = 2 * f_ref * --------------------
+ *                        pd + 1
+ */
+unsigned long mxc_decode_pll(unsigned int reg_val, u32 freq)
+{
+	long long ll;
+	int mfn_abs;
+	unsigned int mfi, mfn, mfd, pd;
+
+	mfi = (reg_val >> 10) & 0xf;
+	mfn = reg_val & 0x3ff;
+	mfd = (reg_val >> 16) & 0x3ff;
+	pd =  (reg_val >> 26) & 0xf;
+
+	mfi = mfi <= 5 ? 5 : mfi;
+
+	mfn_abs = mfn;
+
+#if !defined CONFIG_ARCH_MX1 && !defined CONFIG_ARCH_MX21
+	if (mfn >= 0x200) {
+		mfn |= 0xFFFFFE00;
+		mfn_abs = -mfn;
+	}
+#endif
+
+	freq *= 2;
+	freq /= pd + 1;
+
+	ll = (unsigned long long)freq * mfn_abs;
+
+	do_div(ll, mfd + 1);
+	if (mfn < 0)
+		ll = -ll;
+	ll = (freq * mfi) + ll;
+
+	return ll;
+}
diff --git a/arch/arm/plat-mxc/include/mach/clock.h b/arch/arm/plat-mxc/include/mach/clock.h
index d21f78e..b830655 100644
--- a/arch/arm/plat-mxc/include/mach/clock.h
+++ b/arch/arm/plat-mxc/include/mach/clock.h
@@ -63,5 +63,7 @@
 int clk_register(struct clk *clk);
 void clk_unregister(struct clk *clk);
 
+unsigned long mxc_decode_pll(unsigned int pll, u32 f_ref);
+
 #endif /* __ASSEMBLY__ */
 #endif /* __ASM_ARCH_MXC_CLOCK_H__ */