Merge branch 'fixes' into cleanups

[people/ms/u-boot.git] / cpu / at32ap / at32ap700x / clk.c

diff --git a/cpu/at32ap/at32ap700x/clk.c b/cpu/at32ap/at32ap700x/clk.c
index 2b1cd36bfbb101bff82a8edd5c0f27140039a6c2..2c2e19c296c3edbfbfaa2e62fd4059b49a19af83 100644 (file)
--- a/cpu/at32ap/at32ap700x/clk.c
+++ b/cpu/at32ap/at32ap700x/clk.c
@@ -25,6 +25,7 @@
 
 #include <asm/arch/clk.h>
 #include <asm/arch/memory-map.h>
+#include <asm/arch/portmux.h>
 
 #include "sm.h"
 
@@ -66,3 +67,27 @@ void clk_init(void)
        sm_writel(PM_MCCTRL, SM_BIT(PLLSEL));
 #endif
 }
+
+unsigned long __gclk_set_rate(unsigned int id, enum gclk_parent parent,
+               unsigned long rate, unsigned long parent_rate)
+{
+       unsigned long divider;
+
+       if (rate == 0 || parent_rate == 0) {
+               sm_writel(PM_GCCTRL(id), 0);
+               return 0;
+       }
+
+       divider = (parent_rate + rate / 2) / rate;
+       if (divider <= 1) {
+               sm_writel(PM_GCCTRL(id), parent | SM_BIT(CEN));
+               rate = parent_rate;
+       } else {
+               divider = min(255, divider / 2 - 1);
+               sm_writel(PM_GCCTRL(id), parent | SM_BIT(CEN) | SM_BIT(DIVEN)
+                               | SM_BF(DIV, divider));
+               rate = parent_rate / (2 * (divider + 1));
+       }
+
+       return rate;
+}