diff options
Diffstat (limited to 'drivers/clk/qcom/clk-alpha-pll.c')
| -rw-r--r-- | drivers/clk/qcom/clk-alpha-pll.c | 83 |
1 files changed, 79 insertions, 4 deletions
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c index 38ed1b83a094..2a4b0c9f5c4d 100644 --- a/drivers/clk/qcom/clk-alpha-pll.c +++ b/drivers/clk/qcom/clk-alpha-pll.c @@ -32,7 +32,10 @@ # define PLL_VOTE_FSM_ENA BIT(20) # define PLL_FSM_ENA BIT(20) # define PLL_VOTE_FSM_RESET BIT(21) +# define PLL_UPDATE BIT(22) +# define PLL_UPDATE_BYPASS BIT(23) # define PLL_OFFLINE_ACK BIT(28) +# define ALPHA_PLL_ACK_LATCH BIT(29) # define PLL_ACTIVE_FLAG BIT(30) # define PLL_LOCK_DET BIT(31) @@ -130,6 +133,15 @@ static int wait_for_pll(struct clk_alpha_pll *pll, u32 mask, bool inverse, #define wait_for_pll_offline(pll) \ wait_for_pll(pll, PLL_OFFLINE_ACK, 0, "offline") +#define wait_for_pll_update(pll) \ + wait_for_pll(pll, PLL_UPDATE, 1, "update") + +#define wait_for_pll_update_ack_set(pll) \ + wait_for_pll(pll, ALPHA_PLL_ACK_LATCH, 0, "update_ack_set") + +#define wait_for_pll_update_ack_clear(pll) \ + wait_for_pll(pll, ALPHA_PLL_ACK_LATCH, 1, "update_ack_clear") + void clk_alpha_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap, const struct alpha_pll_config *config) { @@ -402,8 +414,57 @@ clk_alpha_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) return alpha_pll_calc_rate(prate, l, a, alpha_width); } -static int clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate, - unsigned long prate) +static int clk_alpha_pll_update_latch(struct clk_alpha_pll *pll, + int (*is_enabled)(struct clk_hw *)) +{ + int ret; + u32 mode; + + if (!is_enabled(&pll->clkr.hw) || + !(pll->flags & SUPPORTS_DYNAMIC_UPDATE)) + return 0; + + regmap_read(pll->clkr.regmap, PLL_MODE(pll), &mode); + + /* Latch the input to the PLL */ + regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), PLL_UPDATE, + PLL_UPDATE); + + /* Wait for 2 reference cycle before checking ACK bit */ + udelay(1); + + /* + * PLL will latch the new L, Alpha and freq control word. + * PLL will respond by raising PLL_ACK_LATCH output when new programming + * has been latched in and PLL is being updated. When + * UPDATE_LOGIC_BYPASS bit is not set, PLL_UPDATE will be cleared + * automatically by hardware when PLL_ACK_LATCH is asserted by PLL. + */ + if (mode & PLL_UPDATE_BYPASS) { + ret = wait_for_pll_update_ack_set(pll); + if (ret) + return ret; + + regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), PLL_UPDATE, 0); + } else { + ret = wait_for_pll_update(pll); + if (ret) + return ret; + } + + ret = wait_for_pll_update_ack_clear(pll); + if (ret) + return ret; + + /* Wait for PLL output to stabilize */ + udelay(10); + + return 0; +} + +static int __clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate, + int (*is_enabled)(struct clk_hw *)) { struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); const struct pll_vco *vco; @@ -434,7 +495,21 @@ static int clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate, regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), PLL_ALPHA_EN, PLL_ALPHA_EN); - return 0; + return clk_alpha_pll_update_latch(pll, is_enabled); +} + +static int clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + return __clk_alpha_pll_set_rate(hw, rate, prate, + clk_alpha_pll_is_enabled); +} + +static int clk_alpha_pll_hwfsm_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + return __clk_alpha_pll_set_rate(hw, rate, prate, + clk_alpha_pll_hwfsm_is_enabled); } static long clk_alpha_pll_round_rate(struct clk_hw *hw, unsigned long rate, @@ -471,7 +546,7 @@ const struct clk_ops clk_alpha_pll_hwfsm_ops = { .is_enabled = clk_alpha_pll_hwfsm_is_enabled, .recalc_rate = clk_alpha_pll_recalc_rate, .round_rate = clk_alpha_pll_round_rate, - .set_rate = clk_alpha_pll_set_rate, + .set_rate = clk_alpha_pll_hwfsm_set_rate, }; EXPORT_SYMBOL_GPL(clk_alpha_pll_hwfsm_ops); |