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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 | // SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2016 Maxime Ripard * Maxime Ripard <maxime.ripard@free-electrons.com> */ #include <linux/clk-provider.h> #include <linux/io.h> #include "ccu_gate.h" #include "ccu_nkm.h" struct _ccu_nkm { unsigned long n, min_n, max_n; unsigned long k, min_k, max_k; unsigned long m, min_m, max_m; }; static void ccu_nkm_find_best(unsigned long parent, unsigned long rate, struct _ccu_nkm *nkm) { unsigned long best_rate = 0; unsigned long best_n = 0, best_k = 0, best_m = 0; unsigned long _n, _k, _m; for (_k = nkm->min_k; _k <= nkm->max_k; _k++) { for (_n = nkm->min_n; _n <= nkm->max_n; _n++) { for (_m = nkm->min_m; _m <= nkm->max_m; _m++) { unsigned long tmp_rate; tmp_rate = parent * _n * _k / _m; if (tmp_rate > rate) continue; if ((rate - tmp_rate) < (rate - best_rate)) { best_rate = tmp_rate; best_n = _n; best_k = _k; best_m = _m; } } } } nkm->n = best_n; nkm->k = best_k; nkm->m = best_m; } static void ccu_nkm_disable(struct clk_hw *hw) { struct ccu_nkm *nkm = hw_to_ccu_nkm(hw); return ccu_gate_helper_disable(&nkm->common, nkm->enable); } static int ccu_nkm_enable(struct clk_hw *hw) { struct ccu_nkm *nkm = hw_to_ccu_nkm(hw); return ccu_gate_helper_enable(&nkm->common, nkm->enable); } static int ccu_nkm_is_enabled(struct clk_hw *hw) { struct ccu_nkm *nkm = hw_to_ccu_nkm(hw); return ccu_gate_helper_is_enabled(&nkm->common, nkm->enable); } static unsigned long ccu_nkm_recalc_rate(struct clk_hw *hw, unsigned long parent_rate) { struct ccu_nkm *nkm = hw_to_ccu_nkm(hw); unsigned long n, m, k, rate; u32 reg; reg = readl(nkm->common.base + nkm->common.reg); n = reg >> nkm->n.shift; n &= (1 << nkm->n.width) - 1; n += nkm->n.offset; if (!n) n++; k = reg >> nkm->k.shift; k &= (1 << nkm->k.width) - 1; k += nkm->k.offset; if (!k) k++; m = reg >> nkm->m.shift; m &= (1 << nkm->m.width) - 1; m += nkm->m.offset; if (!m) m++; rate = parent_rate * n * k / m; if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV) rate /= nkm->fixed_post_div; return rate; } static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux, struct clk_hw *hw, unsigned long *parent_rate, unsigned long rate, void *data) { struct ccu_nkm *nkm = data; struct _ccu_nkm _nkm; _nkm.min_n = nkm->n.min ?: 1; _nkm.max_n = nkm->n.max ?: 1 << nkm->n.width; _nkm.min_k = nkm->k.min ?: 1; _nkm.max_k = nkm->k.max ?: 1 << nkm->k.width; _nkm.min_m = 1; _nkm.max_m = nkm->m.max ?: 1 << nkm->m.width; if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV) rate *= nkm->fixed_post_div; ccu_nkm_find_best(*parent_rate, rate, &_nkm); rate = *parent_rate * _nkm.n * _nkm.k / _nkm.m; if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV) rate /= nkm->fixed_post_div; return rate; } static int ccu_nkm_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) { struct ccu_nkm *nkm = hw_to_ccu_nkm(hw); return ccu_mux_helper_determine_rate(&nkm->common, &nkm->mux, req, ccu_nkm_round_rate, nkm); } static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct ccu_nkm *nkm = hw_to_ccu_nkm(hw); struct _ccu_nkm _nkm; unsigned long flags; u32 reg; if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV) rate *= nkm->fixed_post_div; _nkm.min_n = nkm->n.min ?: 1; _nkm.max_n = nkm->n.max ?: 1 << nkm->n.width; _nkm.min_k = nkm->k.min ?: 1; _nkm.max_k = nkm->k.max ?: 1 << nkm->k.width; _nkm.min_m = 1; _nkm.max_m = nkm->m.max ?: 1 << nkm->m.width; ccu_nkm_find_best(parent_rate, rate, &_nkm); spin_lock_irqsave(nkm->common.lock, flags); reg = readl(nkm->common.base + nkm->common.reg); reg &= ~GENMASK(nkm->n.width + nkm->n.shift - 1, nkm->n.shift); reg &= ~GENMASK(nkm->k.width + nkm->k.shift - 1, nkm->k.shift); reg &= ~GENMASK(nkm->m.width + nkm->m.shift - 1, nkm->m.shift); reg |= (_nkm.n - nkm->n.offset) << nkm->n.shift; reg |= (_nkm.k - nkm->k.offset) << nkm->k.shift; reg |= (_nkm.m - nkm->m.offset) << nkm->m.shift; writel(reg, nkm->common.base + nkm->common.reg); spin_unlock_irqrestore(nkm->common.lock, flags); ccu_helper_wait_for_lock(&nkm->common, nkm->lock); return 0; } static u8 ccu_nkm_get_parent(struct clk_hw *hw) { struct ccu_nkm *nkm = hw_to_ccu_nkm(hw); return ccu_mux_helper_get_parent(&nkm->common, &nkm->mux); } static int ccu_nkm_set_parent(struct clk_hw *hw, u8 index) { struct ccu_nkm *nkm = hw_to_ccu_nkm(hw); return ccu_mux_helper_set_parent(&nkm->common, &nkm->mux, index); } const struct clk_ops ccu_nkm_ops = { .disable = ccu_nkm_disable, .enable = ccu_nkm_enable, .is_enabled = ccu_nkm_is_enabled, .get_parent = ccu_nkm_get_parent, .set_parent = ccu_nkm_set_parent, .determine_rate = ccu_nkm_determine_rate, .recalc_rate = ccu_nkm_recalc_rate, .set_rate = ccu_nkm_set_rate, }; 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