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clk: samsung: Add enable/disable support for PLL35XX clocks 

Some PLLs might be disabled by default after turning off and then on
a power domain which they belongs to.  To avoid configuring a disabled
PLL, add proper code for handling PLL enable/disable.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
This commit is contained in:
Marek Szyprowski 2017-01-25 12:52:32 +01:00 committed by Sylwester Nawrocki
parent 9341e39d41
commit 96a8d7536f
1 changed files with 38 additions and 7 deletions
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45
drivers/clk/samsung/clk-pll.c
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@ -136,11 +136,39 @@ static const struct clk_ops samsung_pll3000_clk_ops = {
#define PLL35XX_MDIV_MASK (0x3FF)
#define PLL35XX_PDIV_MASK (0x3F)
#define PLL35XX_SDIV_MASK (0x7)
#define PLL35XX_LOCK_STAT_MASK (0x1)
#define PLL35XX_MDIV_SHIFT (16)
#define PLL35XX_PDIV_SHIFT (8)
#define PLL35XX_SDIV_SHIFT (0)
#define PLL35XX_LOCK_STAT_SHIFT (29)
#define PLL35XX_ENABLE_SHIFT (31)
static int samsung_pll35xx_enable(struct clk_hw *hw)
{
struct samsung_clk_pll *pll = to_clk_pll(hw);
u32 tmp;
tmp = readl_relaxed(pll->con_reg);
tmp |= BIT(PLL35XX_ENABLE_SHIFT);
writel_relaxed(tmp, pll->con_reg);
/* wait_lock_time */
do {
cpu_relax();
tmp = readl_relaxed(pll->con_reg);
} while (!(tmp & BIT(PLL35XX_LOCK_STAT_SHIFT)));
return 0;
}
static void samsung_pll35xx_disable(struct clk_hw *hw)
{
struct samsung_clk_pll *pll = to_clk_pll(hw);
u32 tmp;
tmp = readl_relaxed(pll->con_reg);
tmp &= ~BIT(PLL35XX_ENABLE_SHIFT);
writel_relaxed(tmp, pll->con_reg);
}
static unsigned long samsung_pll35xx_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
@ -210,12 +238,13 @@ static int samsung_pll35xx_set_rate(struct clk_hw *hw, unsigned long drate,
(rate->sdiv << PLL35XX_SDIV_SHIFT);
writel_relaxed(tmp, pll->con_reg);
/* wait_lock_time */
do {
cpu_relax();
tmp = readl_relaxed(pll->con_reg);
} while (!(tmp & (PLL35XX_LOCK_STAT_MASK
<< PLL35XX_LOCK_STAT_SHIFT)));
/* wait_lock_time if enabled */
if (tmp & BIT(PLL35XX_ENABLE_SHIFT)) {
do {
cpu_relax();
tmp = readl_relaxed(pll->con_reg);
} while (!(tmp & BIT(PLL35XX_LOCK_STAT_SHIFT)));
}
return 0;
}
@ -223,6 +252,8 @@ static const struct clk_ops samsung_pll35xx_clk_ops = {
.recalc_rate = samsung_pll35xx_recalc_rate,
.round_rate = samsung_pll_round_rate,
.set_rate = samsung_pll35xx_set_rate,
.enable = samsung_pll35xx_enable,
.disable = samsung_pll35xx_disable,
};
static const struct clk_ops samsung_pll35xx_clk_min_ops = {