diff options
Diffstat (limited to 'drivers/clk/qcom/clk-alpha-pll.c')
| -rw-r--r-- | drivers/clk/qcom/clk-alpha-pll.c | 1114 |
1 files changed, 1114 insertions, 0 deletions
diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c new file mode 100644 index 000000000..a91d97cec --- /dev/null +++ b/drivers/clk/qcom/clk-alpha-pll.c @@ -0,0 +1,1114 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2015, 2018, The Linux Foundation. All rights reserved. + */ + +#include <linux/kernel.h> +#include <linux/export.h> +#include <linux/clk-provider.h> +#include <linux/regmap.h> +#include <linux/delay.h> + +#include "clk-alpha-pll.h" +#include "common.h" + +#define PLL_MODE(p) ((p)->offset + 0x0) +# define PLL_OUTCTRL BIT(0) +# define PLL_BYPASSNL BIT(1) +# define PLL_RESET_N BIT(2) +# define PLL_OFFLINE_REQ BIT(7) +# define PLL_LOCK_COUNT_SHIFT 8 +# define PLL_LOCK_COUNT_MASK 0x3f +# define PLL_BIAS_COUNT_SHIFT 14 +# define PLL_BIAS_COUNT_MASK 0x3f +# 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) + +#define PLL_L_VAL(p) ((p)->offset + (p)->regs[PLL_OFF_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]) + +#define PLL_USER_CTL(p) ((p)->offset + (p)->regs[PLL_OFF_USER_CTL]) +# define PLL_POST_DIV_SHIFT 8 +# define PLL_POST_DIV_MASK(p) GENMASK((p)->width, 0) +# define PLL_ALPHA_EN BIT(24) +# define PLL_ALPHA_MODE BIT(25) +# define PLL_VCO_SHIFT 20 +# define PLL_VCO_MASK 0x3 + +#define PLL_USER_CTL_U(p) ((p)->offset + (p)->regs[PLL_OFF_USER_CTL_U]) + +#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_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] = { + [PLL_OFF_L_VAL] = 0x04, + [PLL_OFF_ALPHA_VAL] = 0x08, + [PLL_OFF_ALPHA_VAL_U] = 0x0c, + [PLL_OFF_USER_CTL] = 0x10, + [PLL_OFF_USER_CTL_U] = 0x14, + [PLL_OFF_CONFIG_CTL] = 0x18, + [PLL_OFF_TEST_CTL] = 0x1c, + [PLL_OFF_TEST_CTL_U] = 0x20, + [PLL_OFF_STATUS] = 0x24, + }, + [CLK_ALPHA_PLL_TYPE_HUAYRA] = { + [PLL_OFF_L_VAL] = 0x04, + [PLL_OFF_ALPHA_VAL] = 0x08, + [PLL_OFF_USER_CTL] = 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, + }, + [CLK_ALPHA_PLL_TYPE_BRAMMO] = { + [PLL_OFF_L_VAL] = 0x04, + [PLL_OFF_ALPHA_VAL] = 0x08, + [PLL_OFF_ALPHA_VAL_U] = 0x0c, + [PLL_OFF_USER_CTL] = 0x10, + [PLL_OFF_CONFIG_CTL] = 0x18, + [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); + +/* + * Even though 40 bits are present, use only 32 for ease of calculation. + */ +#define ALPHA_REG_BITWIDTH 40 +#define ALPHA_REG_16BIT_WIDTH 16 +#define ALPHA_BITWIDTH 32U +#define ALPHA_SHIFT(w) min(w, ALPHA_BITWIDTH) + +#define PLL_HUAYRA_M_WIDTH 8 +#define PLL_HUAYRA_M_SHIFT 8 +#define PLL_HUAYRA_M_MASK 0xff +#define PLL_HUAYRA_N_SHIFT 0 +#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) + +#define pll_has_64bit_config(p) ((PLL_CONFIG_CTL_U(p) - PLL_CONFIG_CTL(p)) == 4) + +#define to_clk_alpha_pll(_hw) container_of(to_clk_regmap(_hw), \ + struct clk_alpha_pll, clkr) + +#define to_clk_alpha_pll_postdiv(_hw) container_of(to_clk_regmap(_hw), \ + struct clk_alpha_pll_postdiv, clkr) + +static int wait_for_pll(struct clk_alpha_pll *pll, u32 mask, bool inverse, + const char *action) +{ + u32 val; + int count; + int ret; + const char *name = clk_hw_get_name(&pll->clkr.hw); + + ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + if (ret) + return ret; + + for (count = 100; count > 0; count--) { + ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + if (ret) + return ret; + if (inverse && !(val & mask)) + return 0; + else if ((val & mask) == mask) + return 0; + + udelay(1); + } + + WARN(1, "%s failed to %s!\n", name, action); + return -ETIMEDOUT; +} + +#define wait_for_pll_enable_active(pll) \ + wait_for_pll(pll, PLL_ACTIVE_FLAG, 0, "enable") + +#define wait_for_pll_enable_lock(pll) \ + wait_for_pll(pll, PLL_LOCK_DET, 0, "enable") + +#define wait_for_pll_disable(pll) \ + wait_for_pll(pll, PLL_ACTIVE_FLAG, 1, "disable") + +#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) +{ + u32 val, mask; + + regmap_write(regmap, PLL_L_VAL(pll), config->l); + regmap_write(regmap, PLL_ALPHA_VAL(pll), config->alpha); + regmap_write(regmap, PLL_CONFIG_CTL(pll), config->config_ctl_val); + + if (pll_has_64bit_config(pll)) + regmap_write(regmap, PLL_CONFIG_CTL_U(pll), + config->config_ctl_hi_val); + + if (pll_alpha_width(pll) > 32) + regmap_write(regmap, PLL_ALPHA_VAL_U(pll), config->alpha_hi); + + val = config->main_output_mask; + val |= config->aux_output_mask; + val |= config->aux2_output_mask; + val |= config->early_output_mask; + val |= config->pre_div_val; + val |= config->post_div_val; + val |= config->vco_val; + val |= config->alpha_en_mask; + val |= config->alpha_mode_mask; + + mask = config->main_output_mask; + mask |= config->aux_output_mask; + mask |= config->aux2_output_mask; + mask |= config->early_output_mask; + mask |= config->pre_div_mask; + mask |= config->post_div_mask; + mask |= config->vco_mask; + + regmap_update_bits(regmap, PLL_USER_CTL(pll), mask, val); + + if (pll->flags & SUPPORTS_FSM_MODE) + qcom_pll_set_fsm_mode(regmap, PLL_MODE(pll), 6, 0); +} + +static int clk_alpha_pll_hwfsm_enable(struct clk_hw *hw) +{ + int ret; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val; + + ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + if (ret) + return ret; + + val |= PLL_FSM_ENA; + + if (pll->flags & SUPPORTS_OFFLINE_REQ) + val &= ~PLL_OFFLINE_REQ; + + ret = regmap_write(pll->clkr.regmap, PLL_MODE(pll), val); + if (ret) + return ret; + + /* Make sure enable request goes through before waiting for update */ + mb(); + + return wait_for_pll_enable_active(pll); +} + +static void clk_alpha_pll_hwfsm_disable(struct clk_hw *hw) +{ + int ret; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val; + + ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + if (ret) + return; + + if (pll->flags & SUPPORTS_OFFLINE_REQ) { + ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), + PLL_OFFLINE_REQ, PLL_OFFLINE_REQ); + if (ret) + return; + + ret = wait_for_pll_offline(pll); + if (ret) + return; + } + + /* Disable hwfsm */ + ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), + PLL_FSM_ENA, 0); + if (ret) + return; + + wait_for_pll_disable(pll); +} + +static int pll_is_enabled(struct clk_hw *hw, u32 mask) +{ + int ret; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val; + + ret = regmap_read(pll->clkr.regmap, PLL_MODE(pll), &val); + if (ret) + return ret; + + return !!(val & mask); +} + +static int clk_alpha_pll_hwfsm_is_enabled(struct clk_hw *hw) +{ + return pll_is_enabled(hw, PLL_ACTIVE_FLAG); +} + +static int clk_alpha_pll_is_enabled(struct clk_hw *hw) +{ + return pll_is_enabled(hw, PLL_LOCK_DET); +} + +static int clk_alpha_pll_enable(struct clk_hw *hw) +{ + int ret; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val, mask; + + mask = PLL_OUTCTRL | PLL_RESET_N | PLL_BYPASSNL; + 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); + } + + /* Skip if already enabled */ + if ((val & mask) == mask) + return 0; + + ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), + PLL_BYPASSNL, PLL_BYPASSNL); + if (ret) + return ret; + + /* + * H/W requires a 5us delay between disabling the bypass and + * de-asserting the reset. + */ + mb(); + udelay(5); + + ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), + PLL_RESET_N, PLL_RESET_N); + if (ret) + return ret; + + ret = wait_for_pll_enable_lock(pll); + if (ret) + return ret; + + ret = regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), + PLL_OUTCTRL, PLL_OUTCTRL); + + /* Ensure that the write above goes through before returning. */ + mb(); + return ret; +} + +static void clk_alpha_pll_disable(struct clk_hw *hw) +{ + int ret; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 val, mask; + + 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; + } + + mask = PLL_OUTCTRL; + regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), mask, 0); + + /* Delay of 2 output clock ticks required until output is disabled */ + mb(); + udelay(1); + + mask = PLL_RESET_N | PLL_BYPASSNL; + regmap_update_bits(pll->clkr.regmap, PLL_MODE(pll), mask, 0); +} + +static unsigned long +alpha_pll_calc_rate(u64 prate, u32 l, u32 a, u32 alpha_width) +{ + return (prate * l) + ((prate * a) >> ALPHA_SHIFT(alpha_width)); +} + +static unsigned long +alpha_pll_round_rate(unsigned long rate, unsigned long prate, u32 *l, u64 *a, + u32 alpha_width) +{ + u64 remainder; + u64 quotient; + + quotient = rate; + remainder = do_div(quotient, prate); + *l = quotient; + + if (!remainder) { + *a = 0; + return rate; + } + + /* Upper ALPHA_BITWIDTH bits of Alpha */ + quotient = remainder << ALPHA_SHIFT(alpha_width); + + remainder = do_div(quotient, prate); + + if (remainder) + quotient++; + + *a = quotient; + return alpha_pll_calc_rate(prate, *l, *a, alpha_width); +} + +static const struct pll_vco * +alpha_pll_find_vco(const struct clk_alpha_pll *pll, unsigned long rate) +{ + const struct pll_vco *v = pll->vco_table; + const struct pll_vco *end = v + pll->num_vco; + + for (; v < end; v++) + if (rate >= v->min_freq && rate <= v->max_freq) + return v; + + return NULL; +} + +static unsigned long +clk_alpha_pll_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + u32 l, low, high, ctl; + u64 a = 0, prate = parent_rate; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 alpha_width = pll_alpha_width(pll); + + regmap_read(pll->clkr.regmap, PLL_L_VAL(pll), &l); + + regmap_read(pll->clkr.regmap, PLL_USER_CTL(pll), &ctl); + if (ctl & PLL_ALPHA_EN) { + regmap_read(pll->clkr.regmap, PLL_ALPHA_VAL(pll), &low); + if (alpha_width > 32) { + regmap_read(pll->clkr.regmap, PLL_ALPHA_VAL_U(pll), + &high); + a = (u64)high << 32 | low; + } else { + a = low & GENMASK(alpha_width - 1, 0); + } + + if (alpha_width > ALPHA_BITWIDTH) + a >>= alpha_width - ALPHA_BITWIDTH; + } + + return alpha_pll_calc_rate(prate, l, a, alpha_width); +} + + +static int __clk_alpha_pll_update_latch(struct clk_alpha_pll *pll) +{ + int ret; + u32 mode; + + 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_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 *)) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + const struct pll_vco *vco; + u32 l, alpha_width = pll_alpha_width(pll); + u64 a; + + rate = alpha_pll_round_rate(rate, prate, &l, &a, alpha_width); + vco = alpha_pll_find_vco(pll, rate); + if (pll->vco_table && !vco) { + pr_err("alpha pll not in a valid vco range\n"); + return -EINVAL; + } + + regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l); + + if (alpha_width > ALPHA_BITWIDTH) + a <<= alpha_width - ALPHA_BITWIDTH; + + if (alpha_width > 32) + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL_U(pll), a >> 32); + + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a); + + if (vco) { + regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), + PLL_VCO_MASK << PLL_VCO_SHIFT, + vco->val << PLL_VCO_SHIFT); + } + + regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), + PLL_ALPHA_EN, PLL_ALPHA_EN); + + 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, + unsigned long *prate) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 l, alpha_width = pll_alpha_width(pll); + u64 a; + unsigned long min_freq, max_freq; + + rate = alpha_pll_round_rate(rate, *prate, &l, &a, alpha_width); + if (!pll->vco_table || alpha_pll_find_vco(pll, rate)) + return rate; + + min_freq = pll->vco_table[0].min_freq; + max_freq = pll->vco_table[pll->num_vco - 1].max_freq; + + return clamp(rate, min_freq, max_freq); +} + +static unsigned long +alpha_huayra_pll_calc_rate(u64 prate, u32 l, u32 a) +{ + /* + * a contains 16 bit alpha_val in two’s compliment number in the range + * of [-0.5, 0.5). + */ + if (a >= BIT(PLL_HUAYRA_ALPHA_WIDTH - 1)) + l -= 1; + + return (prate * l) + (prate * a >> PLL_HUAYRA_ALPHA_WIDTH); +} + +static unsigned long +alpha_huayra_pll_round_rate(unsigned long rate, unsigned long prate, + u32 *l, u32 *a) +{ + u64 remainder; + u64 quotient; + + quotient = rate; + remainder = do_div(quotient, prate); + *l = quotient; + + if (!remainder) { + *a = 0; + return rate; + } + + quotient = remainder << PLL_HUAYRA_ALPHA_WIDTH; + remainder = do_div(quotient, prate); + + if (remainder) + quotient++; + + /* + * alpha_val should be in two’s compliment number in the range + * of [-0.5, 0.5) so if quotient >= 0.5 then increment the l value + * since alpha value will be subtracted in this case. + */ + if (quotient >= BIT(PLL_HUAYRA_ALPHA_WIDTH - 1)) + *l += 1; + + *a = quotient; + return alpha_huayra_pll_calc_rate(prate, *l, *a); +} + +static unsigned long +alpha_pll_huayra_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + u64 rate = parent_rate, tmp; + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 l, alpha = 0, ctl, alpha_m, alpha_n; + + regmap_read(pll->clkr.regmap, PLL_L_VAL(pll), &l); + regmap_read(pll->clkr.regmap, PLL_USER_CTL(pll), &ctl); + + if (ctl & PLL_ALPHA_EN) { + regmap_read(pll->clkr.regmap, PLL_ALPHA_VAL(pll), &alpha); + /* + * Depending upon alpha_mode, it can be treated as M/N value or + * as a two’s compliment number. When alpha_mode=1, + * pll_alpha_val<15:8>=M and pll_apla_val<7:0>=N + * + * Fout=FIN*(L+(M/N)) + * + * M is a signed number (-128 to 127) and N is unsigned + * (0 to 255). M/N has to be within +/-0.5. + * + * When alpha_mode=0, it is a two’s compliment number in the + * range [-0.5, 0.5). + * + * Fout=FIN*(L+(alpha_val)/2^16) + * + * where alpha_val is two’s compliment number. + */ + if (!(ctl & PLL_ALPHA_MODE)) + return alpha_huayra_pll_calc_rate(rate, l, alpha); + + alpha_m = alpha >> PLL_HUAYRA_M_SHIFT & PLL_HUAYRA_M_MASK; + alpha_n = alpha >> PLL_HUAYRA_N_SHIFT & PLL_HUAYRA_N_MASK; + + rate *= l; + tmp = parent_rate; + if (alpha_m >= BIT(PLL_HUAYRA_M_WIDTH - 1)) { + alpha_m = BIT(PLL_HUAYRA_M_WIDTH) - alpha_m; + tmp *= alpha_m; + do_div(tmp, alpha_n); + rate -= tmp; + } else { + tmp *= alpha_m; + do_div(tmp, alpha_n); + rate += tmp; + } + + return rate; + } + + return alpha_huayra_pll_calc_rate(rate, l, alpha); +} + +static int alpha_pll_huayra_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long prate) +{ + struct clk_alpha_pll *pll = to_clk_alpha_pll(hw); + u32 l, a, ctl, cur_alpha = 0; + + rate = alpha_huayra_pll_round_rate(rate, prate, &l, &a); + + regmap_read(pll->clkr.regmap, PLL_USER_CTL(pll), &ctl); + + if (ctl & PLL_ALPHA_EN) + regmap_read(pll->clkr.regmap, PLL_ALPHA_VAL(pll), &cur_alpha); + + /* + * Huayra PLL supports PLL dynamic programming. User can change L_VAL, + * without having to go through the power on sequence. + */ + if (clk_alpha_pll_is_enabled(hw)) { + if (cur_alpha != a) { + pr_err("clock needs to be gated %s\n", + clk_hw_get_name(hw)); + return -EBUSY; + } + + regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l); + /* Ensure that the write above goes to detect L val change. */ + mb(); + return wait_for_pll_enable_lock(pll); + } + + regmap_write(pll->clkr.regmap, PLL_L_VAL(pll), l); + regmap_write(pll->clkr.regmap, PLL_ALPHA_VAL(pll), a); + + if (a == 0) + regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), + PLL_ALPHA_EN, 0x0); + else + regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), + PLL_ALPHA_EN | PLL_ALPHA_MODE, PLL_ALPHA_EN); + + return 0; +} + +static long alpha_pll_huayra_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + u32 l, a; + + return alpha_huayra_pll_round_rate(rate, *prate, &l, &a); +} + +const struct clk_ops clk_alpha_pll_ops = { + .enable = clk_alpha_pll_enable, + .disable = clk_alpha_pll_disable, + .is_enabled = clk_alpha_pll_is_enabled, + .recalc_rate = clk_alpha_pll_recalc_rate, + .round_rate = clk_alpha_pll_round_rate, + .set_rate = clk_alpha_pll_set_rate, +}; +EXPORT_SYMBOL_GPL(clk_alpha_pll_ops); + +const struct clk_ops clk_alpha_pll_huayra_ops = { + .enable = clk_alpha_pll_enable, + .disable = clk_alpha_pll_disable, + .is_enabled = clk_alpha_pll_is_enabled, + .recalc_rate = alpha_pll_huayra_recalc_rate, + .round_rate = alpha_pll_huayra_round_rate, + .set_rate = alpha_pll_huayra_set_rate, +}; +EXPORT_SYMBOL_GPL(clk_alpha_pll_huayra_ops); + +const struct clk_ops clk_alpha_pll_hwfsm_ops = { + .enable = clk_alpha_pll_hwfsm_enable, + .disable = clk_alpha_pll_hwfsm_disable, + .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_hwfsm_set_rate, +}; +EXPORT_SYMBOL_GPL(clk_alpha_pll_hwfsm_ops); + +static unsigned long +clk_alpha_pll_postdiv_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw); + u32 ctl; + + regmap_read(pll->clkr.regmap, PLL_USER_CTL(pll), &ctl); + + ctl >>= PLL_POST_DIV_SHIFT; + ctl &= PLL_POST_DIV_MASK(pll); + + return parent_rate >> fls(ctl); +} + +static const struct clk_div_table clk_alpha_div_table[] = { + { 0x0, 1 }, + { 0x1, 2 }, + { 0x3, 4 }, + { 0x7, 8 }, + { 0xf, 16 }, + { } +}; + +static const struct clk_div_table clk_alpha_2bit_div_table[] = { + { 0x0, 1 }, + { 0x1, 2 }, + { 0x3, 4 }, + { } +}; + +static long +clk_alpha_pll_postdiv_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw); + const struct clk_div_table *table; + + if (pll->width == 2) + table = clk_alpha_2bit_div_table; + else + table = clk_alpha_div_table; + + return divider_round_rate(hw, rate, prate, table, + pll->width, CLK_DIVIDER_POWER_OF_TWO); +} + +static long +clk_alpha_pll_postdiv_round_ro_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *prate) +{ + struct clk_alpha_pll_postdiv *pll = to_clk_alpha_pll_postdiv(hw); + u32 ctl, div; + + regmap_read(pll->clkr.regmap, PLL_USER_CTL(pll), &ctl); + + ctl >>= PLL_POST_DIV_SHIFT; + ctl &= BIT(pll->width) - 1; + div = 1 << fls(ctl); + + if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) + *prate = clk_hw_round_rate(clk_hw_get_parent(hw), div * rate); + + return DIV_ROUND_UP_ULL((u64)*prate, div); +} + +static int clk_alpha_pll_postdiv_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 div; + + /* 16 -> 0xf, 8 -> 0x7, 4 -> 0x3, 2 -> 0x1, 1 -> 0x0 */ + div = DIV_ROUND_UP_ULL((u64)parent_rate, rate) - 1; + + return regmap_update_bits(pll->clkr.regmap, PLL_USER_CTL(pll), + PLL_POST_DIV_MASK(pll) << PLL_POST_DIV_SHIFT, + div << PLL_POST_DIV_SHIFT); +} + +const struct clk_ops clk_alpha_pll_postdiv_ops = { + .recalc_rate = clk_alpha_pll_postdiv_recalc_rate, + .round_rate = clk_alpha_pll_postdiv_round_rate, + .set_rate = clk_alpha_pll_postdiv_set_rate, +}; +EXPORT_SYMBOL_GPL(clk_alpha_pll_postdiv_ops); + +const struct clk_ops clk_alpha_pll_postdiv_ro_ops = { + .round_rate = clk_alpha_pll_postdiv_round_ro_rate, + .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); +} +EXPORT_SYMBOL_GPL(clk_fabia_pll_configure); + +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); |