diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c index 6d04cd96482a..9722b701fbdb 100644 --- a/drivers/clk/qcom/clk-alpha-pll.c +++ b/drivers/clk/qcom/clk-alpha-pll.c @@ -1,5 +1,5 @@ /* - * Copyright (c) 2015, The Linux Foundation. All rights reserved. + * Copyright (c) 2015, 2018, The Linux Foundation. All rights reserved. * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and @@ -58,6 +58,8 @@ #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_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]) const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = { [CLK_ALPHA_PLL_TYPE_DEFAULT] = { @@ -90,6 +92,18 @@ const u8 clk_alpha_pll_regs[][PLL_OFF_MAX_REGS] = { [PLL_OFF_TEST_CTL] = 0x1c, [PLL_OFF_STATUS] = 0x24, }, + [CLK_ALPHA_PLL_TYPE_FABIA] = { + [PLL_OFF_L_VAL] = 0x04, + [PLL_OFF_USER_CTL] = 0x0c, + [PLL_OFF_USER_CTL_U] = 0x10, + [PLL_OFF_CONFIG_CTL] = 0x14, + [PLL_OFF_CONFIG_CTL_U] = 0x18, + [PLL_OFF_TEST_CTL] = 0x1c, + [PLL_OFF_TEST_CTL_U] = 0x20, + [PLL_OFF_STATUS] = 0x24, + [PLL_OFF_OPMODE] = 0x2c, + [PLL_OFF_FRAC] = 0x38, + }, }; EXPORT_SYMBOL_GPL(clk_alpha_pll_regs); @@ -108,6 +122,12 @@ 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 FABIA_PLL_OUT_MASK 0x7 +#define FABIA_PLL_RATE_MARGIN 500 + #define pll_alpha_width(p) \ ((PLL_ALPHA_VAL_U(p) - PLL_ALPHA_VAL(p) == 4) ? \ ALPHA_REG_BITWIDTH : ALPHA_REG_16BIT_WIDTH) @@ -441,16 +461,12 @@ 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_update_latch(struct clk_alpha_pll *pll, - int (*is_enabled)(struct clk_hw *)) + +static int __clk_alpha_pll_update_latch(struct clk_alpha_pll *pll) { 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 */ @@ -489,6 +505,16 @@ static int clk_alpha_pll_update_latch(struct clk_alpha_pll *pll, return 0; } +static int clk_alpha_pll_update_latch(struct clk_alpha_pll *pll, + int (*is_enabled)(struct clk_hw *)) +{ + if (!is_enabled(&pll->clkr.hw) || + !(pll->flags & SUPPORTS_DYNAMIC_UPDATE)) + return 0; + + return __clk_alpha_pll_update_latch(pll); +} + static int __clk_alpha_pll_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long prate, int (*is_enabled)(struct clk_hw *)) @@ -832,3 +858,264 @@ const struct clk_ops clk_alpha_pll_postdiv_ro_ops = { .recalc_rate = clk_alpha_pll_postdiv_recalc_rate, }; EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_ro_ops); + +void clk_fabia_pll_configure(struct clk_alpha_pll *pll, struct regmap *regmap, + const struct alpha_pll_config *config) +{ + u32 val, mask; + + if (config->l) + regmap_write(regmap, PLL_L_VAL(pll), config->l); + + if (config->alpha) + regmap_write(regmap, PLL_FRAC(pll), config->alpha); + + if (config->config_ctl_val) + regmap_write(regmap, PLL_CONFIG_CTL(pll), + config->config_ctl_val); + + if (config->post_div_mask) { + mask = config->post_div_mask; + val = config->post_div_val; + regmap_update_bits(regmap, PLL_USER_CTL(pll), mask, val); + } + + regmap_update_bits(regmap, PLL_MODE(pll), PLL_UPDATE_BYPASS, + PLL_UPDATE_BYPASS); + + regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, PLL_RESET_N); +} + +static int alpha_pll_fabia_enable(struct clk_hw *hw) +{ + int ret; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val, opmode_val; + struct regmap *regmap = pll->clkr.regmap; + + ret = regmap_read(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); + } + + ret = regmap_read(regmap, PLL_OPMODE(pll), &opmode_val); + if (ret) + return ret; + + /* Skip If PLL is already running */ + if ((opmode_val & FABIA_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); + if (ret) + return ret; + + ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_RESET_N, + PLL_RESET_N); + if (ret) + return ret; + + ret = regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_RUN); + if (ret) + return ret; + + ret = wait_for_pll_enable_lock(pll); + if (ret) + return ret; + + ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), + FABIA_PLL_OUT_MASK, FABIA_PLL_OUT_MASK); + if (ret) + return ret; + + return regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, + PLL_OUTCTRL); +} + +static void alpha_pll_fabia_disable(struct clk_hw *hw) +{ + int ret; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val; + struct regmap *regmap = pll->clkr.regmap; + + ret = regmap_read(regmap, PLL_MODE(pll), &val); + if (ret) + return; + + /* If in FSM mode, just unvote it */ + if (val & PLL_FSM_ENA) { + clk_disable_regmap(hw); + return; + } + + ret = regmap_update_bits(regmap, PLL_MODE(pll), PLL_OUTCTRL, 0); + if (ret) + return; + + /* Disable main outputs */ + ret = regmap_update_bits(regmap, PLL_USER_CTL(pll), FABIA_PLL_OUT_MASK, + 0); + if (ret) + return; + + /* Place the PLL in STANDBY */ + regmap_write(regmap, PLL_OPMODE(pll), FABIA_OPMODE_STANDBY); +} + +static unsigned long alpha_pll_fabia_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 l, frac, alpha_width = pll_alpha_width(pll); + + regmap_read(pll->clkr.regmap, PLL_L_VAL(pll), &l); + regmap_read(pll->clkr.regmap, PLL_FRAC(pll), &frac); + + return alpha_pll_calc_rate(parent_rate, l, frac, alpha_width); +} + +static int alpha_pll_fabia_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val, l, alpha_width = pll_alpha_width(pll); + u64 a; + unsigned long rrate; + int ret = 0; + + ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + if (ret) + return ret; + + rrate = alpha_pll_round_rate(rate, prate, &l, &a, alpha_width); + + /* + * 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) { + 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_FRAC(pll), a); + + return __clk_alpha_pll_update_latch(pll); +} + +const struct clk_ops clk_alpha_pll_fabia_ops = { + .enable = alpha_pll_fabia_enable, + .disable = alpha_pll_fabia_disable, + .is_enabled = clk_alpha_pll_is_enabled, + .set_rate = alpha_pll_fabia_set_rate, + .recalc_rate = alpha_pll_fabia_recalc_rate, + .round_rate = clk_alpha_pll_round_rate, +}; +EXPORT_SYMBOL_GPL(clk_alpha_pll_fabia_ops); + +const struct clk_ops clk_alpha_pll_fixed_fabia_ops = { + .enable = alpha_pll_fabia_enable, + .disable = alpha_pll_fabia_disable, + .is_enabled = clk_alpha_pll_is_enabled, + .recalc_rate = alpha_pll_fabia_recalc_rate, + .round_rate = clk_alpha_pll_round_rate, +}; +EXPORT_SYMBOL_GPL(clk_alpha_pll_fixed_fabia_ops); + +static unsigned long clk_alpha_pll_postdiv_fabia_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw); + u32 i, div = 1, val; + int ret; + + if (!pll->post_div_table) { + pr_err("Missing the post_div_table for the PLL\n"); + return -EINVAL; + } + + ret = regmap_read(pll->clkr.regmap, PLL_USER_CTL(pll), &val); + if (ret) + return ret; + + val >>= pll->post_div_shift; + val &= BIT(pll->width) - 1; + + for (i = 0; i < pll->num_post_div; i++) { + if (pll->post_div_table[i].val == val) { + div = pll->post_div_table[i].div; + break; + } + } + + return (parent_rate / div); +} + +static long clk_alpha_pll_postdiv_fabia_round_rate(struct clk_hw *hw, + unsigned long rate, unsigned long *prate) +{ + struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw); + + if (!pll->post_div_table) { + pr_err("Missing the post_div_table for the PLL\n"); + return -EINVAL; + } + + return divider_round_rate(hw, rate, prate, pll->post_div_table, + pll->width, CLK_DIVIDER_ROUND_CLOSEST); +} + +static int clk_alpha_pll_postdiv_fabia_set_rate(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate) +{ + struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw); + int i, val = 0, div, ret; + + /* + * If the PLL is in FSM mode, then treat set_rate callback as a + * no-operation. + */ + ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + if (ret) + return ret; + + if (val & PLL_VOTE_FSM_ENA) + return 0; + + if (!pll->post_div_table) { + pr_err("Missing the post_div_table for the PLL\n"); + return -EINVAL; + } + + div = DIV_ROUND_UP_ULL((u64)parent_rate, rate); + for (i = 0; i < pll->num_post_div; i++) { + if (pll->post_div_table[i].div == div) { + val = pll->post_div_table[i].val; + break; + } + } + + return regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), + (BIT(pll->width) - 1) << pll->post_div_shift, + val << pll->post_div_shift); +} + +const struct clk_ops clk_alpha_pll_postdiv_fabia_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_GPL(clk_alpha_pll_postdiv_fabia_ops); diff --git a/drivers/clk/qcom/clk-alpha-pll.h b/drivers/clk/qcom/clk-alpha-pll.h index 7593e8a56cf2..f981b486c468 100644 --- a/drivers/clk/qcom/clk-alpha-pll.h +++ b/drivers/clk/qcom/clk-alpha-pll.h @@ -1,5 +1,5 @@ /* - * Copyright (c) 2015, The Linux Foundation. All rights reserved. + * Copyright (c) 2015, 2018, The Linux Foundation. All rights reserved. * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and @@ -22,6 +22,7 @@ enum { CLK_ALPHA_PLL_TYPE_DEFAULT, CLK_ALPHA_PLL_TYPE_HUAYRA, CLK_ALPHA_PLL_TYPE_BRAMMO, + CLK_ALPHA_PLL_TYPE_FABIA, CLK_ALPHA_PLL_TYPE_MAX, }; @@ -36,6 +37,8 @@ enum { PLL_OFF_TEST_CTL, PLL_OFF_TEST_CTL_U, PLL_OFF_STATUS, + PLL_OFF_OPMODE, + PLL_OFF_FRAC, PLL_OFF_MAX_REGS }; @@ -73,6 +76,10 @@ struct clk_alpha_pll { * @offset: base address of registers * @regs: alpha pll register map (see @clk_alpha_pll_regs) * @width: width of post-divider + * @post_div_shift: shift to differentiate between odd & even post-divider + * @post_div_table: table with PLL odd and even post-divider settings + * @num_post_div: Number of PLL post-divider settings + * * @clkr: regmap clock handle */ struct clk_alpha_pll_postdiv { @@ -81,6 +88,9 @@ struct clk_alpha_pll_postdiv { const u8 *regs; struct clk_regmap clkr; + int post_div_shift; + const struct clk_div_table *post_div_table; + size_t num_post_div; }; struct alpha_pll_config { @@ -109,7 +119,13 @@ extern const struct clk_ops clk_alpha_pll_postdiv_ops; extern const struct clk_ops clk_alpha_pll_huayra_ops; extern const struct clk_ops clk_alpha_pll_postdiv_ro_ops; +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; + 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); #endif