diff options
Diffstat (limited to 'drivers/clk/sunxi/clk-sunxi.c')
| -rw-r--r-- | drivers/clk/sunxi/clk-sunxi.c | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/drivers/clk/sunxi/clk-sunxi.c b/drivers/clk/sunxi/clk-sunxi.c index 9eddf22d56a..426483422d3 100644 --- a/drivers/clk/sunxi/clk-sunxi.c +++ b/drivers/clk/sunxi/clk-sunxi.c @@ -507,6 +507,43 @@ CLK_OF_DECLARE(sun7i_a20_gmac, "allwinner,sun7i-a20-gmac-clk", /** + * clk_sunxi_mmc_phase_control() - configures MMC clock phase control + */ + +void clk_sunxi_mmc_phase_control(struct clk *clk, 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_hw *hw = __clk_get_hw(clk); + 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); +} +EXPORT_SYMBOL(clk_sunxi_mmc_phase_control); + + +/** * sunxi_factors_clk_setup() - Setup function for factor clocks */ |