sh: add sh7724 kick callback to clk_div4_table

This patch adds a ->kick() callback to clk_div4_table
and ties it into sh_clk_div4_set_rate(). A sh7724
specific kick function is also added that updates the
KICK bit whenever div4 clocks in FRQCRA and FRQCRB
have been set. Allows us to set the VPU clock.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 15 insertions, 0 deletions

diff --git a/arch/sh/kernel/cpu/clock-cpg.c b/arch/sh/kernel/cpu/clock-cpg.c
index 1fc8a0e50603..eed5eaff96ba 100644
--- a/arch/sh/kernel/cpu/clock-cpg.c
+++ b/arch/sh/kernel/cpu/clock-cpg.c
@@ -188,6 +188,7 @@ static int sh_clk_div4_set_parent(struct clk *clk, struct clk *parent)
 
 static int sh_clk_div4_set_rate(struct clk *clk, unsigned long rate, int algo_id)
 {
+        struct clk_div4_table *d4t = clk->priv;
         unsigned long value;
         int idx = clk_rate_table_find(clk, clk->freq_table, rate);
         if (idx < 0)
@@ -198,6 +199,9 @@ static int sh_clk_div4_set_rate(struct clk *clk, unsigned long rate, int algo_id
         value |= (idx << clk->enable_bit);
         __raw_writel(value, clk->enable_reg);
 
+        if (d4t->kick)
+                d4t->kick(clk);
+
         return 0;
 }
 
diff --git a/arch/sh/kernel/cpu/sh4a/clock-sh7724.c b/arch/sh/kernel/cpu/sh4a/clock-sh7724.c
index 70517900ef8f..a8a993fc894a 100644
--- a/arch/sh/kernel/cpu/sh4a/clock-sh7724.c
+++ b/arch/sh/kernel/cpu/sh4a/clock-sh7724.c
@@ -127,6 +127,16 @@ struct clk *main_clks[] = {
         &div3_clk,
 };
 
+static void div4_kick(struct clk *clk)
+{
+        unsigned long value;
+
+        /* set KICK bit in FRQCRA to update hardware setting */
+        value = __raw_readl(FRQCRA);
+        value |= (1 << 31);
+        __raw_writel(value, FRQCRA);
+}
+
 static int divisors[] = { 2, 3, 4, 6, 8, 12, 16, 0, 24, 32, 36, 48, 0, 72 };
 
 static struct clk_div_mult_table div4_div_mult_table = {
@@ -136,6 +146,7 @@ static struct clk_div_mult_table div4_div_mult_table = {
 
 static struct clk_div4_table div4_table = {
         .div_mult_table = &div4_div_mult_table,
+        .kick = div4_kick,
 };
 
 enum { DIV4_I, DIV4_SH, DIV4_B, DIV4_P, DIV4_M1, DIV4_NR };