rk3066: force sdmmc & sdio even div

diff --git a/arch/arm/mach-rk30/clock_data.c b/arch/arm/mach-rk30/clock_data.c
index 69fcb5eea65cc7b39dae5e1c32acf294415e0cb8..b36760c47245500a98a5b5d8929689d2a582009a 100644 (file)
--- a/arch/arm/mach-rk30/clock_data.c
+++ b/arch/arm/mach-rk30/clock_data.c
@@ -294,6 +294,24 @@ static int clksel_set_rate_shift_2(struct clk *clk, unsigned long rate)
        }
        return -ENOENT;
 }
+
+//for div 1 2 4 2*n
+static int clksel_set_rate_even(struct clk *clk, unsigned long rate)
+{
+       u32 div;
+       for (div = 2; div < clk->div_max; div += 2) {
+               u32 new_rate = clk->parent->rate / div;
+               if (new_rate <= rate) {
+                       set_cru_bits_w_msk(div - 1, clk->div_mask, clk->div_shift, clk->clksel_con);
+                       clk->rate = new_rate;
+                       pr_debug("%s for clock %s to rate %ld (even div = %d)\n", 
+                                       __func__, clk->name, rate, div);
+                       return 0;
+               }
+       }
+       return -ENOENT;
+}
+
 static u32 clk_get_freediv(unsigned long rate_out, unsigned long rate ,u32 div_max)
 {
        u32 div;
@@ -1649,7 +1667,7 @@ static struct clk clk_sdmmc = {
        .parent         = &hclk_periph,
        .mode           = gate_mode,
        .recalc         = clksel_recalc_div,
-       .set_rate       = clksel_set_rate_freediv,
+       .set_rate       = clksel_set_rate_even,
        .gate_idx       = CLK_GATE_MMC0,
        .clksel_con =CRU_CLKSELS_CON(11),
        CRU_DIV_SET(0x3f,0,64),
@@ -1660,7 +1678,7 @@ static struct clk clk_sdio = {
        .parent         = &hclk_periph,
        .mode           = gate_mode,
        .recalc         = clksel_recalc_div,
-       .set_rate       = clksel_set_rate_freediv,
+       .set_rate       = clksel_set_rate_even,
        .gate_idx       = CLK_GATE_SDIO,
        .clksel_con =CRU_CLKSELS_CON(12),
        CRU_DIV_SET(0x3f,0,64),
@@ -3372,6 +3390,8 @@ static void __init rk30_clock_common_init(unsigned long gpll_rate,unsigned long
        //clk_set_parent_nolock(&clk_gpu, &general_pll_clk);
        
        clk_set_rate_nolock(&clk_uart0, 49500000);
+       clk_set_rate_nolock(&clk_sdmmc, 24750000);
+       clk_set_rate_nolock(&clk_sdio, 24750000);
 }
 
 static struct clk def_ops_clk={