clk: divider: add explicit big endian support

Add a clock specific flag to switch register accesses to big endian, to
allow runtime configuration of big endian divider clocks.

Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 20 insertions, 4 deletions

diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
index e5a17265cfaf..32f93dc6b6d6 100644
--- a/drivers/clk/clk-divider.c
+++ b/drivers/clk/clk-divider.c
@@ -25,6 +25,22 @@
  * parent - fixed parent.  No clk_set_parent support
  */
 
+static inline u32 clk_div_readl(struct clk_divider *divider)
+{
+	if (divider->flags & CLK_DIVIDER_BIG_ENDIAN)
+		return ioread32be(divider->reg);
+
+	return clk_readl(divider->reg);
+}
+
+static inline void clk_div_writel(struct clk_divider *divider, u32 val)
+{
+	if (divider->flags & CLK_DIVIDER_BIG_ENDIAN)
+		iowrite32be(val, divider->reg);
+	else
+		clk_writel(val, divider->reg);
+}
+
 static unsigned int _get_table_maxdiv(const struct clk_div_table *table,
 				      u8 width)
 {
@@ -135,7 +151,7 @@ static unsigned long clk_divider_recalc_rate(struct clk_hw *hw,
 	struct clk_divider *divider = to_clk_divider(hw);
 	unsigned int val;
 
-	val = clk_readl(divider->reg) >> divider->shift;
+	val = clk_div_readl(divider) >> divider->shift;
 	val &= clk_div_mask(divider->width);
 
 	return divider_recalc_rate(hw, parent_rate, val, divider->table,
@@ -370,7 +386,7 @@ static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
 	if (divider->flags & CLK_DIVIDER_READ_ONLY) {
 		u32 val;
 
-		val = clk_readl(divider->reg) >> divider->shift;
+		val = clk_div_readl(divider) >> divider->shift;
 		val &= clk_div_mask(divider->width);
 
 		return divider_ro_round_rate(hw, rate, prate, divider->table,
@@ -420,11 +436,11 @@ static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
 	if (divider->flags & CLK_DIVIDER_HIWORD_MASK) {
 		val = clk_div_mask(divider->width) << (divider->shift + 16);
 	} else {
-		val = clk_readl(divider->reg);
+		val = clk_div_readl(divider);
 		val &= ~(clk_div_mask(divider->width) << divider->shift);
 	}
 	val |= (u32)value << divider->shift;
-	clk_writel(val, divider->reg);
+	clk_div_writel(divider, val);
 
 	if (divider->lock)
 		spin_unlock_irqrestore(divider->lock, flags);