diff options
Diffstat (limited to 'drivers/clk/samsung')
| -rw-r--r-- | drivers/clk/samsung/clk-pll.c | 45 |
1 files changed, 38 insertions, 7 deletions
diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c index 9617825daabb..52290894857a 100644 --- a/drivers/clk/samsung/clk-pll.c +++ b/drivers/clk/samsung/clk-pll.c @@ -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 = { |