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Diffstat (limited to 'arch/arm/plat-mxc/clock.c')
-rw-r--r--arch/arm/plat-mxc/clock.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm/plat-mxc/clock.c b/arch/arm/plat-mxc/clock.c
index 0a38f0b396e..92e13566cd4 100644
--- a/arch/arm/plat-mxc/clock.c
+++ b/arch/arm/plat-mxc/clock.c
@@ -48,6 +48,11 @@ static DEFINE_MUTEX(clocks_mutex);
*-------------------------------------------------------------------------*/
/*
+ * All the code inside #ifndef CONFIG_COMMON_CLKDEV can be removed once all
+ * MXC architectures have switched to using clkdev.
+ */
+#ifndef CONFIG_COMMON_CLKDEV
+/*
* Retrieve a clock by name.
*
* Note that we first try to use device id on the bus
@@ -110,6 +115,7 @@ found:
return clk;
}
EXPORT_SYMBOL(clk_get);
+#endif
static void __clk_disable(struct clk *clk)
{
@@ -187,6 +193,7 @@ unsigned long clk_get_rate(struct clk *clk)
}
EXPORT_SYMBOL(clk_get_rate);
+#ifndef CONFIG_COMMON_CLKDEV
/* Decrement the clock's module reference count */
void clk_put(struct clk *clk)
{
@@ -194,6 +201,7 @@ void clk_put(struct clk *clk)
module_put(clk->owner);
}
EXPORT_SYMBOL(clk_put);
+#endif
/* Round the requested clock rate to the nearest supported
* rate that is less than or equal to the requested rate.
@@ -257,6 +265,7 @@ struct clk *clk_get_parent(struct clk *clk)
}
EXPORT_SYMBOL(clk_get_parent);
+#ifndef CONFIG_COMMON_CLKDEV
/*
* Add a new clock to the clock tree.
*/
@@ -327,4 +336,49 @@ static int __init mxc_setup_proc_entry(void)
}
late_initcall(mxc_setup_proc_entry);
+#endif /* CONFIG_PROC_FS */
+#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;
+}