EXNOS: SMDK5422: support control kfc frequency

This patch supports kfc core frequency to minimal. When cpu temperature
is hot, it is helpful to minimize cpu clock. It also support reset cpu
clock to default value.

Signed-off-by: Chanho Park <chanho61.park@samsung.com>

diff --git a/board/samsung/smdk5422/clock_init.c b/board/samsung/smdk5422/clock_init.c
index 2003bf2fa9e4f284bddc49f9019d5d3540ae622a..7423eddd477c1195f158788a66506bebe70a6e2b 100644 (file)
--- a/board/samsung/smdk5422/clock_init.c
+++ b/board/samsung/smdk5422/clock_init.c
@@ -38,6 +38,22 @@ u32 gEvtNum;
 u32 g_nMEMCLK;
 #endif
 
+void set_kfc_clock(int min)
+{
+       struct exynos5420_clock *clk =
+               (struct exynos5420_clock *)EXYNOS5_CLOCK_BASE;
+
+#ifdef CONFIG_CPU_EXYNOS5422_EVT0
+       if (min) {
+               writel(0x03300720, &clk->div_kfc0);
+               writel(0x80C80303, &clk->kpll_con0);
+       } else {
+               writel(0x03500720, &clk->div_kfc0);
+               writel(0x80C80301, &clk->kpll_con0);
+       }
+#endif
+}
+
 void system_clock_init()
 {
        struct exynos5420_clock *clk =

diff --git a/board/samsung/smdk5422/setup.h b/board/samsung/smdk5422/setup.h
index e6da7461dbdb4f1b1913e489dcd632c63d2fc073..7cdfb3dbf18582ec62a5c8c1a0e2e2b49b900cc9 100644 (file)
--- a/board/samsung/smdk5422/setup.h
+++ b/board/samsung/smdk5422/setup.h
@@ -59,4 +59,5 @@ void sdelay(unsigned long);
 void mem_ctrl_init(void);
 void system_clock_init(void);
 extern unsigned int second_boot_info;
+extern void set_kfc_clock(int min);
 #endif