/* * Copyright (c) 2013, 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 * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #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/regmap.h> #include <linux/math64.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 M_REG 0x8 #define N_REG 0xc #define D_REG 0x10 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) { struct clk_rcg2 *rcg = to_clk_rcg2(hw); int num_parents = clk_hw_get_num_parents(hw); u32 cfg; int i, ret; ret = regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg); if (ret) goto err; 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; err: pr_debug("%s: Clock %s has invalid parent, using default.\n", __func__, clk_hw_get_name(hw)); return 0; } 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 0; } 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->cmd_rcgr + CFG_REG, 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 *= 2; rate /= hid_div + 1; } if (mode) { u64 tmp = rate; tmp *= m; do_div(tmp, n); rate = tmp; } return rate; } 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, hid_div, m = 0, n = 0, mode = 0, mask; regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, &cfg); if (rcg->mnd_width) { mask = BIT(rcg->mnd_width) - 1; regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + M_REG, &m); m &= mask; regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG, &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 int _freq_tbl_determine_rate(struct clk_hw *hw, const struct freq_tbl *f, struct clk_rate_request *req) { unsigned long clk_flags, rate = req->rate; struct clk_hw *p; struct clk_rcg2 *rcg = to_clk_rcg2(hw); int index; f = qcom_find_freq(f, rate); 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 (clk_flags & CLK_SET_RATE_PARENT) { if (f->pre_div) { 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); } static int clk_rcg2_configure(struct clk_rcg2 *rcg, const struct freq_tbl *f) { u32 cfg, mask; 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->cmd_rcgr + M_REG, mask, f->m); if (ret) return ret; ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + N_REG, mask, ~(f->n - f->m)); if (ret) return ret; ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + D_REG, mask, ~f->n); if (ret) return ret; } mask = BIT(rcg->hid_width) - 1; mask |= CFG_SRC_SEL_MASK | CFG_MODE_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; ret = regmap_update_bits(rcg->clkr.regmap, rcg->cmd_rcgr + CFG_REG, mask, cfg); if (ret) return ret; return update_config(rcg); } static int __clk_rcg2_set_rate(struct clk_hw *hw, unsigned long 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; 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); } 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); } 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, }; EXPORT_SYMBOL_GPL(clk_rcg2_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 const struct frac_entry frac_table_pixel[] = { { 3, 8 }, { 2, 9 }, { 4, 9 }, { 1, 1 }, { } }; static int clk_pixel_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) { struct clk_rcg2 *rcg = to_clk_rcg2(hw); unsigned long request, src_rate; int delta = 100000; const struct freq_tbl *f = rcg->freq_tbl; const struct frac_entry *frac = frac_table_pixel; int index = qcom_find_src_index(hw, rcg->parent_map, f->src); req->best_parent_hw = clk_hw_get_parent_by_index(hw, index); 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 = *rcg->freq_tbl; const struct frac_entry *frac = frac_table_pixel; unsigned long request; int delta = 100000; u32 mask = BIT(rcg->hid_width) - 1; u32 hid_div; 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) { /* Parent index is set statically in frequency table */ 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);