Patchwork [v2,2/6] clk: sunxi: Implement MMC phase control

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Submitter David Lanzendörfer
Date Feb. 4, 2014, 7:24 p.m.
Message ID <20140204192446.29809.66539.stgit@dizzy-6.o2s.ch>
Download mbox | patch
Permalink /patch/316732/
State New
Headers show

Comments

David Lanzendörfer - Feb. 4, 2014, 7:24 p.m.
From: Emilio López <emilio@elopez.com.ar>

Signed-off-by: Emilio López <emilio@elopez.com.ar>
---
 drivers/clk/sunxi/clk-sunxi.c |   35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

Patch

diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c
index abb6c5a..33b9977 100644
--- a/drivers/clk/sunxi/clk-sunxi.c
+++ b/drivers/clk/sunxi/clk-sunxi.c
@@ -377,6 +377,41 @@  static void sun7i_a20_get_out_factors(u32 *freq, u32 parent_rate,
 
 
 /**
+ * clk_sunxi_mmc_phase_control() - configures MMC clock phase control
+ */
+
+void clk_sunxi_mmc_phase_control(struct clk_hw *hw, u8 sample, u8 output)
+{
+	#define to_clk_composite(_hw) container_of(_hw, struct clk_composite, hw)
+	#define to_clk_factors(_hw) container_of(_hw, struct clk_factors, hw)
+
+	struct clk_composite *composite = to_clk_composite(hw);
+	struct clk_hw *rate_hw = composite->rate_hw;
+	struct clk_factors *factors = to_clk_factors(rate_hw);
+	unsigned long flags = 0;
+	u32 reg;
+
+	if (factors->lock)
+		spin_lock_irqsave(factors->lock, flags);
+
+	reg = readl(factors->reg);
+
+	/* set sample clock phase control */
+	reg &= ~(0x7 << 20);
+	reg |= ((sample & 0x7) << 20);
+
+	/* set output clock phase control */
+	reg &= ~(0x7 << 8);
+	reg |= ((output & 0x7) << 8);
+
+	writel(reg, factors->reg);
+
+	if (factors->lock)
+		spin_unlock_irqrestore(factors->lock, flags);
+}
+
+
+/**
  * sunxi_factors_clk_setup() - Setup function for factor clocks
  */