diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c index 0ced4a5a9a17..89f7384eca3f 100644 --- a/drivers/clk/qcom/clk-alpha-pll.c +++ b/drivers/clk/qcom/clk-alpha-pll.c @@ -32,6 +32,7 @@ # define PLL_LOCK_DET BIT(31) #define PLL_L_VAL(p) ((p)->offset + (p)->regs[PLL_OFF_L_VAL]) +#define PLL_CAL_L_VAL(p) ((p)->offset + (p)->regs[PLL_OFF_CAL_L_VAL]) #define PLL_ALPHA_VAL(p) ((p)->offset + (p)->regs[PLL_OFF_ALPHA_VAL]) #define PLL_ALPHA_VAL_U(p) ((p)->offset + (p)->regs[PLL_OFF_ALPHA_VAL_U]) @@ -44,11 +45,14 @@ # define PLL_VCO_MASK 0x3 #define PLL_USER_CTL_U(p) ((p)->offset + (p)->regs[PLL_OFF_USER_CTL_U]) +#define PLL_USER_CTL_U1(p) ((p)->offset + (p)->regs[PLL_OFF_USER_CTL_U1]) #define PLL_CONFIG_CTL(p) ((p)->offset + (p)->regs[PLL_OFF_CONFIG_CTL]) #define PLL_CONFIG_CTL_U(p) ((p)->offset + (p)->regs[PLL_OFF_CONFIG_CTL_U]) +#define PLL_CONFIG_CTL_U1(p) ((p)->offset + (p)->regs[PLL_OFF_CONFIG_CTL_U1]) #define PLL_TEST_CTL(p) ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL]) #define PLL_TEST_CTL_U(p) ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL_U]) +#define PLL_TEST_CTL_U1(p) ((p)->offset + (p)->regs[PLL_OFF_TEST_CTL_U1]) #define PLL_STATUS(p) ((p)->offset + (p)->regs[PLL_OFF_STATUS]) #define PLL_OPMODE(p) ((p)->offset + (p)->regs[PLL_OFF_OPMODE]) #define PLL_FRAC(p) ((p)->offset + (p)->regs[PLL_OFF_FRAC]) @@ -96,6 +100,22 @@ const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = { [PLL_OFF_OPMODE] = 0x2c, [PLL_OFF_FRAC] = 0x38, }, + [CLK_ALPHA_PLL_TYPE_LUCID] = { + [PLL_OFF_L_VAL] = 0x04, + [PLL_OFF_CAL_L_VAL] = 0x08, + [PLL_OFF_USER_CTL] = 0x0c, + [PLL_OFF_USER_CTL_U] = 0x10, + [PLL_OFF_USER_CTL_U1] = 0x14, + [PLL_OFF_CONFIG_CTL] = 0x18, + [PLL_OFF_CONFIG_CTL_U] = 0x1c, + [PLL_OFF_CONFIG_CTL_U1] = 0x20, + [PLL_OFF_TEST_CTL] = 0x24, + [PLL_OFF_TEST_CTL_U] = 0x28, + [PLL_OFF_TEST_CTL_U1] = 0x2c, + [PLL_OFF_STATUS] = 0x30, + [PLL_OFF_OPMODE] = 0x38, + [PLL_OFF_ALPHA_VAL] = 0x40, + }, }; EXPORT_SYMBOL_GPL(clk_alpha_pll_regs); @@ -114,11 +134,15 @@ EXPORT_SYMBOL_GPL(clk_alpha_pll_regs); #define PLL_HUAYRA_N_MASK 0xff #define PLL_HUAYRA_ALPHA_WIDTH 16 -#define FABIA_OPMODE_STANDBY 0x0 -#define FABIA_OPMODE_RUN 0x1 +#define PLL_OPMODE_STANDBY 0x0 +#define PLL_OPMODE_RUN 0x1 -#define FABIA_PLL_OUT_MASK 0x7 -#define FABIA_PLL_RATE_MARGIN 500 +#define PLL_OUT_MASK 0x7 +#define PLL_OUT_RATE_MARGIN 500 + +/* LUCID PLL specific settings and offsets */ +#define LUCID_PLL_CAL_VAL 0x44 +#define LUCID_PCAL_DONE BIT(26) #define pll_alpha_width(p) \ ((PLL_ALPHA_VAL_U(p) - PLL_ALPHA_VAL(p) == 4) ? \ @@ -904,14 +928,14 @@ static int alpha_pll_fabia_enable(struct clk_hw *hw) return ret; /* Skip If PLL is already running */ - if ((opmode_val & FABIA_OPMODE_RUN) && (val & PLL_OUTCTRL)) + if ((opmode_val & PLL_OPMODE_RUN) && (val & PLL_OUTCTRL)) return 0; ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0); if (ret) return ret; - ret = regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_STANDBY); + ret = regmap_write(regmap, PLL_OPMODE(pll), PLL_OPMODE_STANDBY); if (ret) return ret; @@ -920,7 +944,7 @@ static int alpha_pll_fabia_enable(struct clk_hw *hw) if (ret) return ret; - ret = regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_RUN); + ret = regmap_write(regmap, PLL_OPMODE(pll), PLL_OPMODE_RUN); if (ret) return ret; @@ -929,7 +953,7 @@ static int alpha_pll_fabia_enable(struct clk_hw *hw) return ret; ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), - FABIA_PLL_OUT_MASK, FABIA_PLL_OUT_MASK); + PLL_OUT_MASK, PLL_OUT_MASK); if (ret) return ret; @@ -959,13 +983,13 @@ static void alpha_pll_fabia_disable(struct clk_hw *hw) return; /* Disable main outputs */ - ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), FABIA_PLL_OUT_MASK, + ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), PLL_OUT_MASK, 0); if (ret) return; /* Place the PLL in STANDBY */ - regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_STANDBY); + regmap_write(regmap, PLL_OPMODE(pll), PLL_OPMODE_STANDBY); } static unsigned long alpha_pll_fabia_recalc_rate(struct clk_hw *hw, @@ -999,7 +1023,7 @@ static int alpha_pll_fabia_set_rate(struct clk_hw *hw, unsigned long rate, * Due to limited number of bits for fractional rate programming, the * rounded up rate could be marginally higher than the requested rate. */ - if (rrate > (rate + FABIA_PLL_RATE_MARGIN) || rrate < rate) { + if (rrate > (rate + PLL_OUT_RATE_MARGIN) || rrate < rate) { pr_err("Call set rate on the PLL with rounded rates!\n"); return -EINVAL; } @@ -1113,3 +1137,313 @@ const struct clk_ops clk_alpha_pll_postdiv_fabia_ops = { .set_rate = clk_alpha_pll_postdiv_fabia_set_rate, }; EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_fabia_ops); + +static int lucid_pll_is_enabled(struct clk_alpha_pll *pll, + struct regmap *regmap) +{ + u32 mode_regval, opmode_regval; + int ret; + + ret = regmap_read(regmap, PLL_MODE(pll), &mode_regval); + ret |= regmap_read(regmap, PLL_OPMODE(pll), &opmode_regval); + if (ret) + return 0; + + return ((opmode_regval & PLL_OPMODE_RUN) && + (mode_regval & PLL_OUTCTRL)); +} + +int clk_lucid_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap, + const struct alpha_pll_config *config) +{ + int ret; + + if (lucid_pll_is_enabled(pll, regmap)) { + pr_warn("PLL is already enabled. Skipping configuration.\n"); + return 0; + } + + /* + * Disable the PLL if it's already been initialized. Not doing so might + * lead to the PLL running with the old frequency configuration. + */ + if (pll->inited) { + ret = regmap_update_bits(regmap, PLL_MODE(pll), + PLL_RESET_N, 0); + if (ret) + return ret; + } + + if (config->l) + regmap_write(regmap, PLL_L_VAL(pll), config->l); + + regmap_write(regmap, PLL_CAL_L_VAL(pll), LUCID_PLL_CAL_VAL); + + if (config->alpha) + regmap_write(regmap, PLL_ALPHA_VAL(pll), config->alpha); + if (config->config_ctl_val) + regmap_write(regmap, PLL_CONFIG_CTL(pll), + config->config_ctl_val); + + if (config->config_ctl_hi_val) + regmap_write(regmap, PLL_CONFIG_CTL_U(pll), + config->config_ctl_hi_val); + + if (config->config_ctl_hi1_val) + regmap_write(regmap, PLL_CONFIG_CTL_U1(pll), + config->config_ctl_hi1_val); + + if (config->post_div_mask) + regmap_update_bits(regmap, PLL_USER_CTL(pll), + config->post_div_mask, config->post_div_val); + + regmap_update_bits(regmap, PLL_MODE(pll), + PLL_UPDATE_BYPASS, + PLL_UPDATE_BYPASS); + + /* Disable PLL output */ + ret = regmap_update_bits(regmap, PLL_MODE(pll), + PLL_OUTCTRL, 0); + if (ret) + return ret; + + /* Set operation mode to OFF */ + regmap_write(regmap, PLL_OPMODE(pll), PLL_OPMODE_STANDBY); + + /* PLL should be in OFF mode before continuing */ + wmb(); + + /* Place the PLL in STANDBY mode */ + ret = regmap_update_bits(regmap, PLL_MODE(pll), + PLL_RESET_N, PLL_RESET_N); + if (ret) + return ret; + + pll->inited = true; + return 0; +} + +static int alpha_pll_lucid_enable(struct clk_hw *hw) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val; + int ret; + + ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + if (ret) + return ret; + + /* If in FSM mode, just vote for it */ + if (val & PLL_VOTE_FSM_ENA) { + ret = clk_enable_regmap(hw); + if (ret) + return ret; + return wait_for_pll_enable_active(pll); + } + + if (unlikely(!pll->inited)) { + ret = clk_lucid_pll_configure(pll, pll->clkr.regmap, + pll->config); + if (ret) { + pr_err("Failed to configure %s\n", clk_hw_get_name(hw)); + return ret; + } + } + + /* Set operation mode to RUN */ + regmap_write(pll->clkr.regmap, PLL_OPMODE(pll), PLL_OPMODE_RUN); + + ret = wait_for_pll_enable_lock(pll); + if (ret) + return ret; + + /* Enable the PLL outputs */ + ret = regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), + PLL_OUT_MASK, PLL_OUT_MASK); + if (ret) + return ret; + + /* Enable the global PLL outputs */ + ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), + PLL_OUTCTRL, PLL_OUTCTRL); + if (ret) + return ret; + + /* Ensure that the write above goes through before returning. */ + mb(); + return ret; +} + +static void alpha_pll_lucid_disable(struct clk_hw *hw) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val; + int ret; + + ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + if (ret) + return; + + /* If in FSM mode, just unvote it */ + if (val & PLL_VOTE_FSM_ENA) { + clk_disable_regmap(hw); + return; + } + + /* Disable the global PLL output */ + ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), + PLL_OUTCTRL, 0); + if (ret) + return; + + /* Disable the PLL outputs */ + ret = regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), + PLL_OUT_MASK, 0); + if (ret) + return; + + /* Place the PLL mode in STANDBY */ + regmap_write(pll->clkr.regmap, PLL_OPMODE(pll), + PLL_OPMODE_STANDBY); + + regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), PLL_RESET_N, + PLL_RESET_N); +} + +/* + * The Lucid PLL requires a power-on self-calibration which happens when the + * PLL comes out of reset. The calibration is performed at an output frequency + * of ~1300 MHz which means that SW will have to vote on a voltage that's + * equal to or greater than SVS_L1 on the corresponding rail. Since this is not + * feasable to do in the atomic enable path, temporarily bring up the PLL here, + * let it calibrate, and place it in standby before returning. + */ +static int alpha_pll_lucid_prepare(struct clk_hw *hw) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + struct clk_hw *p; + u32 regval; + unsigned long prate; + int ret; + + /* Return early if calibration is not needed. */ + regmap_read(pll->clkr.regmap, PLL_STATUS(pll), ®val); + if (regval & LUCID_PCAL_DONE) + return 0; + + p = clk_hw_get_parent(hw); + if (!p) + return -EINVAL; + + prate = clk_hw_get_rate(p); + if (!prate) + return -EINVAL; + + ret = alpha_pll_lucid_enable(hw); + if (ret) + return ret; + + alpha_pll_lucid_disable(hw); + + return 0; +} + +static unsigned long +alpha_pll_lucid_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 l, frac; + + regmap_read(pll->clkr.regmap, PLL_L_VAL(pll), &l); + regmap_read(pll->clkr.regmap, PLL_ALPHA_VAL(pll), &frac); + + return alpha_pll_calc_rate(parent_rate, l, frac, ALPHA_REG_16BIT_WIDTH); +} + +static int alpha_pll_lucid_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + unsigned long rrate; + u32 regval, l; + u64 a; + int ret; + + rrate = alpha_pll_round_rate(rate, prate, &l, &a, + ALPHA_REG_16BIT_WIDTH); + /* + * Due to a limited number of bits for fractional rate programming, the + * rounded up rate could be marginally higher than the requested rate. + */ + if (rrate > (rate + PLL_OUT_RATE_MARGIN) || rrate < rate) { + pr_err("Call set rate on the PLL with rounded rates!\n"); + return -EINVAL; + } + + regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l); + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a); + + /* Latch the PLL input */ + ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), + PLL_UPDATE, PLL_UPDATE); + if (ret) + return ret; + + /* Wait for 2 reference cycles before checking the ACK bit. */ + udelay(1); + regmap_read(pll->clkr.regmap, PLL_MODE(pll), ®val); + if (!(regval & ALPHA_PLL_ACK_LATCH)) { + WARN(1, "PLL latch failed. Output may be unstable!\n"); + return -EINVAL; + } + + /* Return the latch input to 0 */ + ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), + PLL_UPDATE, 0); + if (ret) + return ret; + + if (clk_hw_is_enabled(hw)) { + ret = wait_for_pll_enable_lock(pll); + if (ret) + return ret; + } + + /* Wait for PLL output to stabilize */ + udelay(100); + return 0; +} + +static int alpha_pll_lucid_is_enabled(struct clk_hw *hw) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + + return lucid_pll_is_enabled(pll, pll->clkr.regmap); +} + +const struct clk_ops clk_alpha_pll_lucid_ops = { + .prepare = alpha_pll_lucid_prepare, + .enable = alpha_pll_lucid_enable, + .disable = alpha_pll_lucid_disable, + .is_enabled = alpha_pll_lucid_is_enabled, + .recalc_rate = alpha_pll_lucid_recalc_rate, + .round_rate = clk_alpha_pll_round_rate, + .set_rate = alpha_pll_lucid_set_rate, +}; +EXPORT_SYMBOL(clk_alpha_pll_lucid_ops); + +const struct clk_ops clk_alpha_pll_fixed_lucid_ops = { + .enable = alpha_pll_lucid_enable, + .disable = alpha_pll_lucid_disable, + .is_enabled = alpha_pll_lucid_is_enabled, + .recalc_rate = alpha_pll_lucid_recalc_rate, + .round_rate = clk_alpha_pll_round_rate, +}; +EXPORT_SYMBOL(clk_alpha_pll_fixed_lucid_ops); + +const struct clk_ops clk_alpha_pll_postdiv_lucid_ops = { + .recalc_rate = clk_alpha_pll_postdiv_fabia_recalc_rate, + .round_rate = clk_alpha_pll_postdiv_fabia_round_rate, + .set_rate = clk_alpha_pll_postdiv_fabia_set_rate, +}; +EXPORT_SYMBOL(clk_alpha_pll_postdiv_lucid_ops); diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h index 66755f0f84fc..1eb611f05068 100644 --- a/drivers/clk/qcom/clk-alpha-pll.h +++ b/drivers/clk/qcom/clk-alpha-pll.h @@ -13,19 +13,24 @@ enum { CLK_ALPHA_PLL_TYPE_HUAYRA, CLK_ALPHA_PLL_TYPE_BRAMMO, CLK_ALPHA_PLL_TYPE_FABIA, + CLK_ALPHA_PLL_TYPE_LUCID, CLK_ALPHA_PLL_TYPE_MAX, }; enum { PLL_OFF_L_VAL, + PLL_OFF_CAL_L_VAL, PLL_OFF_ALPHA_VAL, PLL_OFF_ALPHA_VAL_U, PLL_OFF_USER_CTL, PLL_OFF_USER_CTL_U, + PLL_OFF_USER_CTL_U1, PLL_OFF_CONFIG_CTL, PLL_OFF_CONFIG_CTL_U, + PLL_OFF_CONFIG_CTL_U1, PLL_OFF_TEST_CTL, PLL_OFF_TEST_CTL_U, + PLL_OFF_TEST_CTL_U1, PLL_OFF_STATUS, PLL_OFF_OPMODE, PLL_OFF_FRAC, @@ -43,6 +48,7 @@ struct pll_vco { /** * struct clk_alpha_pll - phase locked loop (PLL) * @offset: base address of registers + * @inited: flag that's set when the PLL is initialized * @vco_table: array of VCO settings * @regs: alpha pll register map (see @clk_alpha_pll_regs) * @clkr: regmap clock handle @@ -50,6 +56,8 @@ struct pll_vco { struct clk_alpha_pll { u32 offset; const u8 *regs; + struct alpha_pll_config *config; + bool inited; const struct pll_vco *vco_table; size_t num_vco; @@ -89,6 +97,7 @@ struct alpha_pll_config { u32 alpha_hi; u32 config_ctl_val; u32 config_ctl_hi_val; + u32 config_ctl_hi1_val; u32 main_output_mask; u32 aux_output_mask; u32 aux2_output_mask; @@ -113,9 +122,14 @@ extern const struct clk_ops clk_alpha_pll_fabia_ops; extern const struct clk_ops clk_alpha_pll_fixed_fabia_ops; extern const struct clk_ops clk_alpha_pll_postdiv_fabia_ops; +extern const struct clk_ops clk_alpha_pll_lucid_ops; +extern const struct clk_ops clk_alpha_pll_fixed_lucid_ops; +extern const struct clk_ops clk_alpha_pll_postdiv_lucid_ops; + void clk_alpha_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap, const struct alpha_pll_config *config); void clk_fabia_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap, const struct alpha_pll_config *config); - +int clk_lucid_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap, + const struct alpha_pll_config *config); #endif