diff options
Diffstat (limited to 'drivers/clk/qcom/clk-rcg2.c')
| -rw-r--r-- | drivers/clk/qcom/clk-rcg2.c | 1412 |
1 files changed, 1412 insertions, 0 deletions
diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c new file mode 100644 index 000000000..dc797bd13 --- /dev/null +++ b/drivers/clk/qcom/clk-rcg2.c @@ -0,0 +1,1412 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2013, 2018, The Linux Foundation. All rights reserved. + */ + +#include <linux/kernel.h> +#include <linux/bitops.h> +#include <linux/err.h> +#include <linux/bug.h> +#include <linux/export.h> +#include <linux/clk-provider.h> +#include <linux/delay.h> +#include <linux/rational.h> +#include <linux/regmap.h> +#include <linux/math64.h> +#include <linux/minmax.h> +#include <linux/slab.h> + +#include <asm/div64.h> + +#include "clk-rcg.h" +#include "common.h" + +#define CMD_REG 0x0 +#define CMD_UPDATE BIT(0) +#define CMD_ROOT_EN BIT(1) +#define CMD_DIRTY_CFG BIT(4) +#define CMD_DIRTY_N BIT(5) +#define CMD_DIRTY_M BIT(6) +#define CMD_DIRTY_D BIT(7) +#define CMD_ROOT_OFF BIT(31) + +#define CFG_REG 0x4 +#define CFG_SRC_DIV_SHIFT 0 +#define CFG_SRC_SEL_SHIFT 8 +#define CFG_SRC_SEL_MASK (0x7 << CFG_SRC_SEL_SHIFT) +#define CFG_MODE_SHIFT 12 +#define CFG_MODE_MASK (0x3 << CFG_MODE_SHIFT) +#define CFG_MODE_DUAL_EDGE (0x2 << CFG_MODE_SHIFT) +#define CFG_HW_CLK_CTRL_MASK BIT(20) + +#define M_REG 0x8 +#define N_REG 0xc +#define D_REG 0x10 + +#define RCG_CFG_OFFSET(rcg) ((rcg)->cmd_rcgr + (rcg)->cfg_off + CFG_REG) +#define RCG_M_OFFSET(rcg) ((rcg)->cmd_rcgr + (rcg)->cfg_off + M_REG) +#define RCG_N_OFFSET(rcg) ((rcg)->cmd_rcgr + (rcg)->cfg_off + N_REG) +#define RCG_D_OFFSET(rcg) ((rcg)->cmd_rcgr + (rcg)->cfg_off + D_REG) + +/* Dynamic Frequency Scaling */ +#define MAX_PERF_LEVEL 8 +#define SE_CMD_DFSR_OFFSET 0x14 +#define SE_CMD_DFS_EN BIT(0) +#define SE_PERF_DFSR(level) (0x1c + 0x4 * (level)) +#define SE_PERF_M_DFSR(level) (0x5c + 0x4 * (level)) +#define SE_PERF_N_DFSR(level) (0x9c + 0x4 * (level)) + +enum freq_policy { + FLOOR, + CEIL, +}; + +static int clk_rcg2_is_enabled(struct clk_hw *hw) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + u32 cmd; + int ret; + + ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd); + if (ret) + return ret; + + return (cmd & CMD_ROOT_OFF) == 0; +} + +static u8 __clk_rcg2_get_parent(struct clk_hw *hw, u32 cfg) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + int num_parents = clk_hw_get_num_parents(hw); + int i; + + cfg &= CFG_SRC_SEL_MASK; + cfg >>= CFG_SRC_SEL_SHIFT; + + for (i = 0; i < num_parents; i++) + if (cfg == rcg->parent_map[i].cfg) + return i; + + pr_debug("%s: Clock %s has invalid parent, using default.\n", + __func__, clk_hw_get_name(hw)); + return 0; +} + +static u8 clk_rcg2_get_parent(struct clk_hw *hw) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + u32 cfg; + int ret; + + ret = regmap_read(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), &cfg); + if (ret) { + pr_debug("%s: Unable to read CFG register for %s\n", + __func__, clk_hw_get_name(hw)); + return 0; + } + + return __clk_rcg2_get_parent(hw, cfg); +} + +static int update_config(struct clk_rcg2 *rcg) +{ + int count, ret; + u32 cmd; + struct clk_hw *hw = &rcg->clkr.hw; + const char *name = clk_hw_get_name(hw); + + ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, + CMD_UPDATE, CMD_UPDATE); + if (ret) + return ret; + + /* Wait for update to take effect */ + for (count = 500; count > 0; count--) { + ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, &cmd); + if (ret) + return ret; + if (!(cmd & CMD_UPDATE)) + return 0; + udelay(1); + } + + WARN(1, "%s: rcg didn't update its configuration.", name); + return -EBUSY; +} + +static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + int ret; + u32 cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT; + + ret = regmap_update_bits(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), + CFG_SRC_SEL_MASK, cfg); + if (ret) + return ret; + + return update_config(rcg); +} + +/* + * Calculate m/n:d rate + * + * parent_rate m + * rate = ----------- x --- + * hid_div n + */ +static unsigned long +calc_rate(unsigned long rate, u32 m, u32 n, u32 mode, u32 hid_div) +{ + if (hid_div) + rate = mult_frac(rate, 2, hid_div + 1); + + if (mode) + rate = mult_frac(rate, m, n); + + return rate; +} + +static unsigned long +__clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate, u32 cfg) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + u32 hid_div, m = 0, n = 0, mode = 0, mask; + + if (rcg->mnd_width) { + mask = BIT(rcg->mnd_width) - 1; + regmap_read(rcg->clkr.regmap, RCG_M_OFFSET(rcg), &m); + m &= mask; + regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), &n); + n = ~n; + n &= mask; + n += m; + mode = cfg & CFG_MODE_MASK; + mode >>= CFG_MODE_SHIFT; + } + + mask = BIT(rcg->hid_width) - 1; + hid_div = cfg >> CFG_SRC_DIV_SHIFT; + hid_div &= mask; + + return calc_rate(parent_rate, m, n, mode, hid_div); +} + +static unsigned long +clk_rcg2_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + u32 cfg; + + regmap_read(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), &cfg); + + return __clk_rcg2_recalc_rate(hw, parent_rate, cfg); +} + +static int _freq_tbl_determine_rate(struct clk_hw *hw, const struct freq_tbl *f, + struct clk_rate_request *req, + enum freq_policy policy) +{ + unsigned long clk_flags, rate = req->rate; + struct clk_hw *p; + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + int index; + + switch (policy) { + case FLOOR: + f = qcom_find_freq_floor(f, rate); + break; + case CEIL: + f = qcom_find_freq(f, rate); + break; + default: + return -EINVAL; + } + + if (!f) + return -EINVAL; + + index = qcom_find_src_index(hw, rcg->parent_map, f->src); + if (index < 0) + return index; + + clk_flags = clk_hw_get_flags(hw); + p = clk_hw_get_parent_by_index(hw, index); + if (!p) + return -EINVAL; + + if (clk_flags & CLK_SET_RATE_PARENT) { + rate = f->freq; + if (f->pre_div) { + if (!rate) + rate = req->rate; + rate /= 2; + rate *= f->pre_div + 1; + } + + if (f->n) { + u64 tmp = rate; + tmp = tmp * f->n; + do_div(tmp, f->m); + rate = tmp; + } + } else { + rate = clk_hw_get_rate(p); + } + req->best_parent_hw = p; + req->best_parent_rate = rate; + req->rate = f->freq; + + return 0; +} + +static int clk_rcg2_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + + return _freq_tbl_determine_rate(hw, rcg->freq_tbl, req, CEIL); +} + +static int clk_rcg2_determine_floor_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + + return _freq_tbl_determine_rate(hw, rcg->freq_tbl, req, FLOOR); +} + +static int __clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f, + u32 *_cfg) +{ + u32 cfg, mask, d_val, not2d_val, n_minus_m; + struct clk_hw *hw = &rcg->clkr.hw; + int ret, index = qcom_find_src_index(hw, rcg->parent_map, f->src); + + if (index < 0) + return index; + + if (rcg->mnd_width && f->n) { + mask = BIT(rcg->mnd_width) - 1; + ret = regmap_update_bits(rcg->clkr.regmap, + RCG_M_OFFSET(rcg), mask, f->m); + if (ret) + return ret; + + ret = regmap_update_bits(rcg->clkr.regmap, + RCG_N_OFFSET(rcg), mask, ~(f->n - f->m)); + if (ret) + return ret; + + /* Calculate 2d value */ + d_val = f->n; + + n_minus_m = f->n - f->m; + n_minus_m *= 2; + + d_val = clamp_t(u32, d_val, f->m, n_minus_m); + not2d_val = ~d_val & mask; + + ret = regmap_update_bits(rcg->clkr.regmap, + RCG_D_OFFSET(rcg), mask, not2d_val); + if (ret) + return ret; + } + + mask = BIT(rcg->hid_width) - 1; + mask |= CFG_SRC_SEL_MASK | CFG_MODE_MASK | CFG_HW_CLK_CTRL_MASK; + cfg = f->pre_div << CFG_SRC_DIV_SHIFT; + cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT; + if (rcg->mnd_width && f->n && (f->m != f->n)) + cfg |= CFG_MODE_DUAL_EDGE; + + *_cfg &= ~mask; + *_cfg |= cfg; + + return 0; +} + +static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f) +{ + u32 cfg; + int ret; + + ret = regmap_read(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), &cfg); + if (ret) + return ret; + + ret = __clk_rcg2_configure(rcg, f, &cfg); + if (ret) + return ret; + + ret = regmap_write(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), cfg); + if (ret) + return ret; + + return update_config(rcg); +} + +static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate, + enum freq_policy policy) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + const struct freq_tbl *f; + + switch (policy) { + case FLOOR: + f = qcom_find_freq_floor(rcg->freq_tbl, rate); + break; + case CEIL: + f = qcom_find_freq(rcg->freq_tbl, rate); + break; + default: + return -EINVAL; + } + + if (!f) + return -EINVAL; + + return clk_rcg2_configure(rcg, f); +} + +static int clk_rcg2_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + return __clk_rcg2_set_rate(hw, rate, CEIL); +} + +static int clk_rcg2_set_floor_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + return __clk_rcg2_set_rate(hw, rate, FLOOR); +} + +static int clk_rcg2_set_rate_and_parent(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate, u8 index) +{ + return __clk_rcg2_set_rate(hw, rate, CEIL); +} + +static int clk_rcg2_set_floor_rate_and_parent(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate, u8 index) +{ + return __clk_rcg2_set_rate(hw, rate, FLOOR); +} + +static int clk_rcg2_get_duty_cycle(struct clk_hw *hw, struct clk_duty *duty) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + u32 notn_m, n, m, d, not2d, mask; + + if (!rcg->mnd_width) { + /* 50 % duty-cycle for Non-MND RCGs */ + duty->num = 1; + duty->den = 2; + return 0; + } + + regmap_read(rcg->clkr.regmap, RCG_D_OFFSET(rcg), ¬2d); + regmap_read(rcg->clkr.regmap, RCG_M_OFFSET(rcg), &m); + regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), ¬n_m); + + if (!not2d && !m && !notn_m) { + /* 50 % duty-cycle always */ + duty->num = 1; + duty->den = 2; + return 0; + } + + mask = BIT(rcg->mnd_width) - 1; + + d = ~(not2d) & mask; + d = DIV_ROUND_CLOSEST(d, 2); + + n = (~(notn_m) + m) & mask; + + duty->num = d; + duty->den = n; + + return 0; +} + +static int clk_rcg2_set_duty_cycle(struct clk_hw *hw, struct clk_duty *duty) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + u32 notn_m, n, m, d, not2d, mask, duty_per, cfg; + int ret; + + /* Duty-cycle cannot be modified for non-MND RCGs */ + if (!rcg->mnd_width) + return -EINVAL; + + mask = BIT(rcg->mnd_width) - 1; + + regmap_read(rcg->clkr.regmap, RCG_N_OFFSET(rcg), ¬n_m); + regmap_read(rcg->clkr.regmap, RCG_M_OFFSET(rcg), &m); + regmap_read(rcg->clkr.regmap, RCG_CFG_OFFSET(rcg), &cfg); + + /* Duty-cycle cannot be modified if MND divider is in bypass mode. */ + if (!(cfg & CFG_MODE_MASK)) + return -EINVAL; + + n = (~(notn_m) + m) & mask; + + duty_per = (duty->num * 100) / duty->den; + + /* Calculate 2d value */ + d = DIV_ROUND_CLOSEST(n * duty_per * 2, 100); + + /* + * Check bit widths of 2d. If D is too big reduce duty cycle. + * Also make sure it is never zero. + */ + d = clamp_val(d, 1, mask); + + if ((d / 2) > (n - m)) + d = (n - m) * 2; + else if ((d / 2) < (m / 2)) + d = m; + + not2d = ~d & mask; + + ret = regmap_update_bits(rcg->clkr.regmap, RCG_D_OFFSET(rcg), mask, + not2d); + if (ret) + return ret; + + return update_config(rcg); +} + +const struct clk_ops clk_rcg2_ops = { + .is_enabled = clk_rcg2_is_enabled, + .get_parent = clk_rcg2_get_parent, + .set_parent = clk_rcg2_set_parent, + .recalc_rate = clk_rcg2_recalc_rate, + .determine_rate = clk_rcg2_determine_rate, + .set_rate = clk_rcg2_set_rate, + .set_rate_and_parent = clk_rcg2_set_rate_and_parent, + .get_duty_cycle = clk_rcg2_get_duty_cycle, + .set_duty_cycle = clk_rcg2_set_duty_cycle, +}; +EXPORT_SYMBOL_GPL(clk_rcg2_ops); + +const struct clk_ops clk_rcg2_floor_ops = { + .is_enabled = clk_rcg2_is_enabled, + .get_parent = clk_rcg2_get_parent, + .set_parent = clk_rcg2_set_parent, + .recalc_rate = clk_rcg2_recalc_rate, + .determine_rate = clk_rcg2_determine_floor_rate, + .set_rate = clk_rcg2_set_floor_rate, + .set_rate_and_parent = clk_rcg2_set_floor_rate_and_parent, + .get_duty_cycle = clk_rcg2_get_duty_cycle, + .set_duty_cycle = clk_rcg2_set_duty_cycle, +}; +EXPORT_SYMBOL_GPL(clk_rcg2_floor_ops); + +const struct clk_ops clk_rcg2_mux_closest_ops = { + .determine_rate = __clk_mux_determine_rate_closest, + .get_parent = clk_rcg2_get_parent, + .set_parent = clk_rcg2_set_parent, +}; +EXPORT_SYMBOL_GPL(clk_rcg2_mux_closest_ops); + +struct frac_entry { + int num; + int den; +}; + +static const struct frac_entry frac_table_675m[] = { /* link rate of 270M */ + { 52, 295 }, /* 119 M */ + { 11, 57 }, /* 130.25 M */ + { 63, 307 }, /* 138.50 M */ + { 11, 50 }, /* 148.50 M */ + { 47, 206 }, /* 154 M */ + { 31, 100 }, /* 205.25 M */ + { 107, 269 }, /* 268.50 M */ + { }, +}; + +static struct frac_entry frac_table_810m[] = { /* Link rate of 162M */ + { 31, 211 }, /* 119 M */ + { 32, 199 }, /* 130.25 M */ + { 63, 307 }, /* 138.50 M */ + { 11, 60 }, /* 148.50 M */ + { 50, 263 }, /* 154 M */ + { 31, 120 }, /* 205.25 M */ + { 119, 359 }, /* 268.50 M */ + { }, +}; + +static int clk_edp_pixel_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + struct freq_tbl f = *rcg->freq_tbl; + const struct frac_entry *frac; + int delta = 100000; + s64 src_rate = parent_rate; + s64 request; + u32 mask = BIT(rcg->hid_width) - 1; + u32 hid_div; + + if (src_rate == 810000000) + frac = frac_table_810m; + else + frac = frac_table_675m; + + for (; frac->num; frac++) { + request = rate; + request *= frac->den; + request = div_s64(request, frac->num); + if ((src_rate < (request - delta)) || + (src_rate > (request + delta))) + continue; + + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, + &hid_div); + f.pre_div = hid_div; + f.pre_div >>= CFG_SRC_DIV_SHIFT; + f.pre_div &= mask; + f.m = frac->num; + f.n = frac->den; + + return clk_rcg2_configure(rcg, &f); + } + + return -EINVAL; +} + +static int clk_edp_pixel_set_rate_and_parent(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate, u8 index) +{ + /* Parent index is set statically in frequency table */ + return clk_edp_pixel_set_rate(hw, rate, parent_rate); +} + +static int clk_edp_pixel_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + const struct freq_tbl *f = rcg->freq_tbl; + const struct frac_entry *frac; + int delta = 100000; + s64 request; + u32 mask = BIT(rcg->hid_width) - 1; + u32 hid_div; + int index = qcom_find_src_index(hw, rcg->parent_map, f->src); + + /* Force the correct parent */ + req->best_parent_hw = clk_hw_get_parent_by_index(hw, index); + req->best_parent_rate = clk_hw_get_rate(req->best_parent_hw); + + if (req->best_parent_rate == 810000000) + frac = frac_table_810m; + else + frac = frac_table_675m; + + for (; frac->num; frac++) { + request = req->rate; + request *= frac->den; + request = div_s64(request, frac->num); + if ((req->best_parent_rate < (request - delta)) || + (req->best_parent_rate > (request + delta))) + continue; + + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, + &hid_div); + hid_div >>= CFG_SRC_DIV_SHIFT; + hid_div &= mask; + + req->rate = calc_rate(req->best_parent_rate, + frac->num, frac->den, + !!frac->den, hid_div); + return 0; + } + + return -EINVAL; +} + +const struct clk_ops clk_edp_pixel_ops = { + .is_enabled = clk_rcg2_is_enabled, + .get_parent = clk_rcg2_get_parent, + .set_parent = clk_rcg2_set_parent, + .recalc_rate = clk_rcg2_recalc_rate, + .set_rate = clk_edp_pixel_set_rate, + .set_rate_and_parent = clk_edp_pixel_set_rate_and_parent, + .determine_rate = clk_edp_pixel_determine_rate, +}; +EXPORT_SYMBOL_GPL(clk_edp_pixel_ops); + +static int clk_byte_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + const struct freq_tbl *f = rcg->freq_tbl; + int index = qcom_find_src_index(hw, rcg->parent_map, f->src); + unsigned long parent_rate, div; + u32 mask = BIT(rcg->hid_width) - 1; + struct clk_hw *p; + + if (req->rate == 0) + return -EINVAL; + + req->best_parent_hw = p = clk_hw_get_parent_by_index(hw, index); + req->best_parent_rate = parent_rate = clk_hw_round_rate(p, req->rate); + + div = DIV_ROUND_UP((2 * parent_rate), req->rate) - 1; + div = min_t(u32, div, mask); + + req->rate = calc_rate(parent_rate, 0, 0, 0, div); + + return 0; +} + +static int clk_byte_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + struct freq_tbl f = *rcg->freq_tbl; + unsigned long div; + u32 mask = BIT(rcg->hid_width) - 1; + + div = DIV_ROUND_UP((2 * parent_rate), rate) - 1; + div = min_t(u32, div, mask); + + f.pre_div = div; + + return clk_rcg2_configure(rcg, &f); +} + +static int clk_byte_set_rate_and_parent(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate, u8 index) +{ + /* Parent index is set statically in frequency table */ + return clk_byte_set_rate(hw, rate, parent_rate); +} + +const struct clk_ops clk_byte_ops = { + .is_enabled = clk_rcg2_is_enabled, + .get_parent = clk_rcg2_get_parent, + .set_parent = clk_rcg2_set_parent, + .recalc_rate = clk_rcg2_recalc_rate, + .set_rate = clk_byte_set_rate, + .set_rate_and_parent = clk_byte_set_rate_and_parent, + .determine_rate = clk_byte_determine_rate, +}; +EXPORT_SYMBOL_GPL(clk_byte_ops); + +static int clk_byte2_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + unsigned long parent_rate, div; + u32 mask = BIT(rcg->hid_width) - 1; + struct clk_hw *p; + unsigned long rate = req->rate; + + if (rate == 0) + return -EINVAL; + + p = req->best_parent_hw; + req->best_parent_rate = parent_rate = clk_hw_round_rate(p, rate); + + div = DIV_ROUND_UP((2 * parent_rate), rate) - 1; + div = min_t(u32, div, mask); + + req->rate = calc_rate(parent_rate, 0, 0, 0, div); + + return 0; +} + +static int clk_byte2_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + struct freq_tbl f = { 0 }; + unsigned long div; + int i, num_parents = clk_hw_get_num_parents(hw); + u32 mask = BIT(rcg->hid_width) - 1; + u32 cfg; + + div = DIV_ROUND_UP((2 * parent_rate), rate) - 1; + div = min_t(u32, div, mask); + + f.pre_div = div; + + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg); + cfg &= CFG_SRC_SEL_MASK; + cfg >>= CFG_SRC_SEL_SHIFT; + + for (i = 0; i < num_parents; i++) { + if (cfg == rcg->parent_map[i].cfg) { + f.src = rcg->parent_map[i].src; + return clk_rcg2_configure(rcg, &f); + } + } + + return -EINVAL; +} + +static int clk_byte2_set_rate_and_parent(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate, u8 index) +{ + /* Read the hardware to determine parent during set_rate */ + return clk_byte2_set_rate(hw, rate, parent_rate); +} + +const struct clk_ops clk_byte2_ops = { + .is_enabled = clk_rcg2_is_enabled, + .get_parent = clk_rcg2_get_parent, + .set_parent = clk_rcg2_set_parent, + .recalc_rate = clk_rcg2_recalc_rate, + .set_rate = clk_byte2_set_rate, + .set_rate_and_parent = clk_byte2_set_rate_and_parent, + .determine_rate = clk_byte2_determine_rate, +}; +EXPORT_SYMBOL_GPL(clk_byte2_ops); + +static const struct frac_entry frac_table_pixel[] = { + { 3, 8 }, + { 2, 9 }, + { 4, 9 }, + { 1, 1 }, + { 2, 3 }, + { } +}; + +static int clk_pixel_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + unsigned long request, src_rate; + int delta = 100000; + const struct frac_entry *frac = frac_table_pixel; + + for (; frac->num; frac++) { + request = (req->rate * frac->den) / frac->num; + + src_rate = clk_hw_round_rate(req->best_parent_hw, request); + if ((src_rate < (request - delta)) || + (src_rate > (request + delta))) + continue; + + req->best_parent_rate = src_rate; + req->rate = (src_rate * frac->num) / frac->den; + return 0; + } + + return -EINVAL; +} + +static int clk_pixel_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + struct freq_tbl f = { 0 }; + const struct frac_entry *frac = frac_table_pixel; + unsigned long request; + int delta = 100000; + u32 mask = BIT(rcg->hid_width) - 1; + u32 hid_div, cfg; + int i, num_parents = clk_hw_get_num_parents(hw); + + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg); + cfg &= CFG_SRC_SEL_MASK; + cfg >>= CFG_SRC_SEL_SHIFT; + + for (i = 0; i < num_parents; i++) + if (cfg == rcg->parent_map[i].cfg) { + f.src = rcg->parent_map[i].src; + break; + } + + for (; frac->num; frac++) { + request = (rate * frac->den) / frac->num; + + if ((parent_rate < (request - delta)) || + (parent_rate > (request + delta))) + continue; + + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, + &hid_div); + f.pre_div = hid_div; + f.pre_div >>= CFG_SRC_DIV_SHIFT; + f.pre_div &= mask; + f.m = frac->num; + f.n = frac->den; + + return clk_rcg2_configure(rcg, &f); + } + return -EINVAL; +} + +static int clk_pixel_set_rate_and_parent(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate, u8 index) +{ + return clk_pixel_set_rate(hw, rate, parent_rate); +} + +const struct clk_ops clk_pixel_ops = { + .is_enabled = clk_rcg2_is_enabled, + .get_parent = clk_rcg2_get_parent, + .set_parent = clk_rcg2_set_parent, + .recalc_rate = clk_rcg2_recalc_rate, + .set_rate = clk_pixel_set_rate, + .set_rate_and_parent = clk_pixel_set_rate_and_parent, + .determine_rate = clk_pixel_determine_rate, +}; +EXPORT_SYMBOL_GPL(clk_pixel_ops); + +static int clk_gfx3d_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_rate_request parent_req = { .min_rate = 0, .max_rate = ULONG_MAX }; + struct clk_rcg2_gfx3d *cgfx = to_clk_rcg2_gfx3d(hw); + struct clk_hw *xo, *p0, *p1, *p2; + unsigned long p0_rate; + u8 mux_div = cgfx->div; + int ret; + + p0 = cgfx->hws[0]; + p1 = cgfx->hws[1]; + p2 = cgfx->hws[2]; + /* + * This function does ping-pong the RCG between PLLs: if we don't + * have at least one fixed PLL and two variable ones, + * then it's not going to work correctly. + */ + if (WARN_ON(!p0 || !p1 || !p2)) + return -EINVAL; + + xo = clk_hw_get_parent_by_index(hw, 0); + if (req->rate == clk_hw_get_rate(xo)) { + req->best_parent_hw = xo; + return 0; + } + + if (mux_div == 0) + mux_div = 1; + + parent_req.rate = req->rate * mux_div; + + /* This has to be a fixed rate PLL */ + p0_rate = clk_hw_get_rate(p0); + + if (parent_req.rate == p0_rate) { + req->rate = req->best_parent_rate = p0_rate; + req->best_parent_hw = p0; + return 0; + } + + if (req->best_parent_hw == p0) { + /* Are we going back to a previously used rate? */ + if (clk_hw_get_rate(p2) == parent_req.rate) + req->best_parent_hw = p2; + else + req->best_parent_hw = p1; + } else if (req->best_parent_hw == p2) { + req->best_parent_hw = p1; + } else { + req->best_parent_hw = p2; + } + + clk_hw_get_rate_range(req->best_parent_hw, + &parent_req.min_rate, &parent_req.max_rate); + + if (req->min_rate > parent_req.min_rate) + parent_req.min_rate = req->min_rate; + + if (req->max_rate < parent_req.max_rate) + parent_req.max_rate = req->max_rate; + + ret = __clk_determine_rate(req->best_parent_hw, &parent_req); + if (ret) + return ret; + + req->rate = req->best_parent_rate = parent_req.rate; + req->rate /= mux_div; + + return 0; +} + +static int clk_gfx3d_set_rate_and_parent(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate, u8 index) +{ + struct clk_rcg2_gfx3d *cgfx = to_clk_rcg2_gfx3d(hw); + struct clk_rcg2 *rcg = &cgfx->rcg; + u32 cfg; + int ret; + + cfg = rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT; + /* On some targets, the GFX3D RCG may need to divide PLL frequency */ + if (cgfx->div > 1) + cfg |= ((2 * cgfx->div) - 1) << CFG_SRC_DIV_SHIFT; + + ret = regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, cfg); + if (ret) + return ret; + + return update_config(rcg); +} + +static int clk_gfx3d_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + /* + * We should never get here; clk_gfx3d_determine_rate() should always + * make us use a different parent than what we're currently using, so + * clk_gfx3d_set_rate_and_parent() should always be called. + */ + return 0; +} + +const struct clk_ops clk_gfx3d_ops = { + .is_enabled = clk_rcg2_is_enabled, + .get_parent = clk_rcg2_get_parent, + .set_parent = clk_rcg2_set_parent, + .recalc_rate = clk_rcg2_recalc_rate, + .set_rate = clk_gfx3d_set_rate, + .set_rate_and_parent = clk_gfx3d_set_rate_and_parent, + .determine_rate = clk_gfx3d_determine_rate, +}; +EXPORT_SYMBOL_GPL(clk_gfx3d_ops); + +static int clk_rcg2_set_force_enable(struct clk_hw *hw) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + const char *name = clk_hw_get_name(hw); + int ret, count; + + ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, + CMD_ROOT_EN, CMD_ROOT_EN); + if (ret) + return ret; + + /* wait for RCG to turn ON */ + for (count = 500; count > 0; count--) { + if (clk_rcg2_is_enabled(hw)) + return 0; + + udelay(1); + } + + pr_err("%s: RCG did not turn on\n", name); + return -ETIMEDOUT; +} + +static int clk_rcg2_clear_force_enable(struct clk_hw *hw) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + + return regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CMD_REG, + CMD_ROOT_EN, 0); +} + +static int +clk_rcg2_shared_force_enable_clear(struct clk_hw *hw, const struct freq_tbl *f) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + int ret; + + ret = clk_rcg2_set_force_enable(hw); + if (ret) + return ret; + + ret = clk_rcg2_configure(rcg, f); + if (ret) + return ret; + + return clk_rcg2_clear_force_enable(hw); +} + +static int clk_rcg2_shared_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + const struct freq_tbl *f; + + f = qcom_find_freq(rcg->freq_tbl, rate); + if (!f) + return -EINVAL; + + /* + * In case clock is disabled, update the M, N and D registers, cache + * the CFG value in parked_cfg and don't hit the update bit of CMD + * register. + */ + if (!clk_hw_is_enabled(hw)) + return __clk_rcg2_configure(rcg, f, &rcg->parked_cfg); + + return clk_rcg2_shared_force_enable_clear(hw, f); +} + +static int clk_rcg2_shared_set_rate_and_parent(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate, u8 index) +{ + return clk_rcg2_shared_set_rate(hw, rate, parent_rate); +} + +static int clk_rcg2_shared_enable(struct clk_hw *hw) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + int ret; + + /* + * Set the update bit because required configuration has already + * been written in clk_rcg2_shared_set_rate() + */ + ret = clk_rcg2_set_force_enable(hw); + if (ret) + return ret; + + /* Write back the stored configuration corresponding to current rate */ + ret = regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, rcg->parked_cfg); + if (ret) + return ret; + + ret = update_config(rcg); + if (ret) + return ret; + + return clk_rcg2_clear_force_enable(hw); +} + +static void clk_rcg2_shared_disable(struct clk_hw *hw) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + + /* + * Store current configuration as switching to safe source would clear + * the SRC and DIV of CFG register + */ + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &rcg->parked_cfg); + + /* + * Park the RCG at a safe configuration - sourced off of safe source. + * Force enable and disable the RCG while configuring it to safeguard + * against any update signal coming from the downstream clock. + * The current parent is still prepared and enabled at this point, and + * the safe source is always on while application processor subsystem + * is online. Therefore, the RCG can safely switch its parent. + */ + clk_rcg2_set_force_enable(hw); + + regmap_write(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, + rcg->safe_src_index << CFG_SRC_SEL_SHIFT); + + update_config(rcg); + + clk_rcg2_clear_force_enable(hw); +} + +static u8 clk_rcg2_shared_get_parent(struct clk_hw *hw) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + + /* If the shared rcg is parked use the cached cfg instead */ + if (!clk_hw_is_enabled(hw)) + return __clk_rcg2_get_parent(hw, rcg->parked_cfg); + + return clk_rcg2_get_parent(hw); +} + +static int clk_rcg2_shared_set_parent(struct clk_hw *hw, u8 index) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + + /* If the shared rcg is parked only update the cached cfg */ + if (!clk_hw_is_enabled(hw)) { + rcg->parked_cfg &= ~CFG_SRC_SEL_MASK; + rcg->parked_cfg |= rcg->parent_map[index].cfg << CFG_SRC_SEL_SHIFT; + + return 0; + } + + return clk_rcg2_set_parent(hw, index); +} + +static unsigned long +clk_rcg2_shared_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + + /* If the shared rcg is parked use the cached cfg instead */ + if (!clk_hw_is_enabled(hw)) + return __clk_rcg2_recalc_rate(hw, parent_rate, rcg->parked_cfg); + + return clk_rcg2_recalc_rate(hw, parent_rate); +} + +const struct clk_ops clk_rcg2_shared_ops = { + .enable = clk_rcg2_shared_enable, + .disable = clk_rcg2_shared_disable, + .get_parent = clk_rcg2_shared_get_parent, + .set_parent = clk_rcg2_shared_set_parent, + .recalc_rate = clk_rcg2_shared_recalc_rate, + .determine_rate = clk_rcg2_determine_rate, + .set_rate = clk_rcg2_shared_set_rate, + .set_rate_and_parent = clk_rcg2_shared_set_rate_and_parent, +}; +EXPORT_SYMBOL_GPL(clk_rcg2_shared_ops); + +/* Common APIs to be used for DFS based RCGR */ +static void clk_rcg2_dfs_populate_freq(struct clk_hw *hw, unsigned int l, + struct freq_tbl *f) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + struct clk_hw *p; + unsigned long prate = 0; + u32 val, mask, cfg, mode, src; + int i, num_parents; + + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + SE_PERF_DFSR(l), &cfg); + + mask = BIT(rcg->hid_width) - 1; + f->pre_div = 1; + if (cfg & mask) + f->pre_div = cfg & mask; + + src = cfg & CFG_SRC_SEL_MASK; + src >>= CFG_SRC_SEL_SHIFT; + + num_parents = clk_hw_get_num_parents(hw); + for (i = 0; i < num_parents; i++) { + if (src == rcg->parent_map[i].cfg) { + f->src = rcg->parent_map[i].src; + p = clk_hw_get_parent_by_index(&rcg->clkr.hw, i); + prate = clk_hw_get_rate(p); + } + } + + mode = cfg & CFG_MODE_MASK; + mode >>= CFG_MODE_SHIFT; + if (mode) { + mask = BIT(rcg->mnd_width) - 1; + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + SE_PERF_M_DFSR(l), + &val); + val &= mask; + f->m = val; + + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + SE_PERF_N_DFSR(l), + &val); + val = ~val; + val &= mask; + val += f->m; + f->n = val; + } + + f->freq = calc_rate(prate, f->m, f->n, mode, f->pre_div); +} + +static int clk_rcg2_dfs_populate_freq_table(struct clk_rcg2 *rcg) +{ + struct freq_tbl *freq_tbl; + int i; + + /* Allocate space for 1 extra since table is NULL terminated */ + freq_tbl = kcalloc(MAX_PERF_LEVEL + 1, sizeof(*freq_tbl), GFP_KERNEL); + if (!freq_tbl) + return -ENOMEM; + rcg->freq_tbl = freq_tbl; + + for (i = 0; i < MAX_PERF_LEVEL; i++) + clk_rcg2_dfs_populate_freq(&rcg->clkr.hw, i, freq_tbl + i); + + return 0; +} + +static int clk_rcg2_dfs_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + int ret; + + if (!rcg->freq_tbl) { + ret = clk_rcg2_dfs_populate_freq_table(rcg); + if (ret) { + pr_err("Failed to update DFS tables for %s\n", + clk_hw_get_name(hw)); + return ret; + } + } + + return clk_rcg2_determine_rate(hw, req); +} + +static unsigned long +clk_rcg2_dfs_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + u32 level, mask, cfg, m = 0, n = 0, mode, pre_div; + + regmap_read(rcg->clkr.regmap, + rcg->cmd_rcgr + SE_CMD_DFSR_OFFSET, &level); + level &= GENMASK(4, 1); + level >>= 1; + + if (rcg->freq_tbl) + return rcg->freq_tbl[level].freq; + + /* + * Assume that parent_rate is actually the parent because + * we can't do any better at figuring it out when the table + * hasn't been populated yet. We only populate the table + * in determine_rate because we can't guarantee the parents + * will be registered with the framework until then. + */ + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + SE_PERF_DFSR(level), + &cfg); + + mask = BIT(rcg->hid_width) - 1; + pre_div = 1; + if (cfg & mask) + pre_div = cfg & mask; + + mode = cfg & CFG_MODE_MASK; + mode >>= CFG_MODE_SHIFT; + if (mode) { + mask = BIT(rcg->mnd_width) - 1; + regmap_read(rcg->clkr.regmap, + rcg->cmd_rcgr + SE_PERF_M_DFSR(level), &m); + m &= mask; + + regmap_read(rcg->clkr.regmap, + rcg->cmd_rcgr + SE_PERF_N_DFSR(level), &n); + n = ~n; + n &= mask; + n += m; + } + + return calc_rate(parent_rate, m, n, mode, pre_div); +} + +static const struct clk_ops clk_rcg2_dfs_ops = { + .is_enabled = clk_rcg2_is_enabled, + .get_parent = clk_rcg2_get_parent, + .determine_rate = clk_rcg2_dfs_determine_rate, + .recalc_rate = clk_rcg2_dfs_recalc_rate, +}; + +static int clk_rcg2_enable_dfs(const struct clk_rcg_dfs_data *data, + struct regmap *regmap) +{ + struct clk_rcg2 *rcg = data->rcg; + struct clk_init_data *init = data->init; + u32 val; + int ret; + + ret = regmap_read(regmap, rcg->cmd_rcgr + SE_CMD_DFSR_OFFSET, &val); + if (ret) + return -EINVAL; + + if (!(val & SE_CMD_DFS_EN)) + return 0; + + /* + * Rate changes with consumer writing a register in + * their own I/O region + */ + init->flags |= CLK_GET_RATE_NOCACHE; + init->ops = &clk_rcg2_dfs_ops; + + rcg->freq_tbl = NULL; + + return 0; +} + +int qcom_cc_register_rcg_dfs(struct regmap *regmap, + const struct clk_rcg_dfs_data *rcgs, size_t len) +{ + int i, ret; + + for (i = 0; i < len; i++) { + ret = clk_rcg2_enable_dfs(&rcgs[i], regmap); + if (ret) + return ret; + } + + return 0; +} +EXPORT_SYMBOL_GPL(qcom_cc_register_rcg_dfs); + +static int clk_rcg2_dp_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + struct freq_tbl f = { 0 }; + u32 mask = BIT(rcg->hid_width) - 1; + u32 hid_div, cfg; + int i, num_parents = clk_hw_get_num_parents(hw); + unsigned long num, den; + + rational_best_approximation(parent_rate, rate, + GENMASK(rcg->mnd_width - 1, 0), + GENMASK(rcg->mnd_width - 1, 0), &den, &num); + + if (!num || !den) + return -EINVAL; + + regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg); + hid_div = cfg; + cfg &= CFG_SRC_SEL_MASK; + cfg >>= CFG_SRC_SEL_SHIFT; + + for (i = 0; i < num_parents; i++) { + if (cfg == rcg->parent_map[i].cfg) { + f.src = rcg->parent_map[i].src; + break; + } + } + + f.pre_div = hid_div; + f.pre_div >>= CFG_SRC_DIV_SHIFT; + f.pre_div &= mask; + + if (num != den) { + f.m = num; + f.n = den; + } else { + f.m = 0; + f.n = 0; + } + + return clk_rcg2_configure(rcg, &f); +} + +static int clk_rcg2_dp_set_rate_and_parent(struct clk_hw *hw, + unsigned long rate, unsigned long parent_rate, u8 index) +{ + return clk_rcg2_dp_set_rate(hw, rate, parent_rate); +} + +static int clk_rcg2_dp_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) +{ + struct clk_rcg2 *rcg = to_clk_rcg2(hw); + unsigned long num, den; + u64 tmp; + + /* Parent rate is a fixed phy link rate */ + rational_best_approximation(req->best_parent_rate, req->rate, + GENMASK(rcg->mnd_width - 1, 0), + GENMASK(rcg->mnd_width - 1, 0), &den, &num); + + if (!num || !den) + return -EINVAL; + + tmp = req->best_parent_rate * num; + do_div(tmp, den); + req->rate = tmp; + + return 0; +} + +const struct clk_ops clk_dp_ops = { + .is_enabled = clk_rcg2_is_enabled, + .get_parent = clk_rcg2_get_parent, + .set_parent = clk_rcg2_set_parent, + .recalc_rate = clk_rcg2_recalc_rate, + .set_rate = clk_rcg2_dp_set_rate, + .set_rate_and_parent = clk_rcg2_dp_set_rate_and_parent, + .determine_rate = clk_rcg2_dp_determine_rate, +}; +EXPORT_SYMBOL_GPL(clk_dp_ops); |