1 /* $NetBSD: sunxi_ccu_nkmp.c,v 1.8 2019/01/02 19:33:06 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2017 Jared McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: sunxi_ccu_nkmp.c,v 1.8 2019/01/02 19:33:06 jmcneill Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/bus.h> 34 35 #include <dev/clk/clk_backend.h> 36 37 #include <arm/sunxi/sunxi_ccu.h> 38 39 int 40 sunxi_ccu_nkmp_enable(struct sunxi_ccu_softc *sc, struct sunxi_ccu_clk *clk, 41 int enable) 42 { 43 struct sunxi_ccu_nkmp *nkmp = &clk->u.nkmp; 44 uint32_t val; 45 int retry; 46 47 KASSERT(clk->type == SUNXI_CCU_NKMP); 48 49 if (!nkmp->enable) 50 return enable ? 0 : EINVAL; 51 52 val = CCU_READ(sc, nkmp->reg); 53 if (enable) 54 val |= nkmp->enable; 55 else 56 val &= ~nkmp->enable; 57 CCU_WRITE(sc, nkmp->reg, val); 58 59 if (enable && nkmp->lock) { 60 for (retry = 1000; retry > 0; retry--) { 61 val = CCU_READ(sc, nkmp->reg); 62 if (val & nkmp->lock) 63 break; 64 delay(100); 65 } 66 if (retry == 0) 67 return ETIMEDOUT; 68 } 69 70 return 0; 71 } 72 73 u_int 74 sunxi_ccu_nkmp_get_rate(struct sunxi_ccu_softc *sc, 75 struct sunxi_ccu_clk *clk) 76 { 77 struct sunxi_ccu_nkmp *nkmp = &clk->u.nkmp; 78 struct clk *clkp, *clkp_parent; 79 u_int rate, n, k, m, p; 80 uint32_t val; 81 82 KASSERT(clk->type == SUNXI_CCU_NKMP); 83 84 clkp = &clk->base; 85 clkp_parent = clk_get_parent(clkp); 86 if (clkp_parent == NULL) 87 return 0; 88 89 rate = clk_get_rate(clkp_parent); 90 if (rate == 0) 91 return 0; 92 93 val = CCU_READ(sc, nkmp->reg); 94 if (nkmp->n) 95 n = __SHIFTOUT(val, nkmp->n); 96 else 97 n = 0; 98 if (nkmp->k) 99 k = __SHIFTOUT(val, nkmp->k); 100 else 101 k = 0; 102 if (nkmp->m) 103 m = __SHIFTOUT(val, nkmp->m); 104 else 105 m = 0; 106 if (nkmp->p) 107 p = __SHIFTOUT(val, nkmp->p); 108 else 109 p = 0; 110 111 if (nkmp->enable && !(val & nkmp->enable)) 112 return 0; 113 114 if ((nkmp->flags & SUNXI_CCU_NKMP_FACTOR_N_EXACT) == 0) 115 n++; 116 117 if ((nkmp->flags & SUNXI_CCU_NKMP_FACTOR_N_ZERO_IS_ONE) != 0 && n == 0) 118 n++; 119 120 k++; 121 122 if ((nkmp->flags & SUNXI_CCU_NKMP_FACTOR_P_POW2) != 0) 123 p = 1 << p; 124 else if ((nkmp->flags & SUNXI_CCU_NKMP_FACTOR_P_X4) != 0) 125 p = p ? 4 : 1; 126 else 127 p++; 128 129 m++; 130 if (nkmp->flags & SUNXI_CCU_NKMP_DIVIDE_BY_TWO) 131 m *= 2; 132 133 return (u_int)((uint64_t)rate * n * k) / (m * p); 134 } 135 136 int 137 sunxi_ccu_nkmp_set_rate(struct sunxi_ccu_softc *sc, 138 struct sunxi_ccu_clk *clk, u_int rate) 139 { 140 struct sunxi_ccu_nkmp *nkmp = &clk->u.nkmp; 141 const struct sunxi_ccu_nkmp_tbl *tab; 142 uint32_t val; 143 144 KASSERT(clk->type == SUNXI_CCU_NKMP); 145 146 if (nkmp->table == NULL || rate == 0) 147 return EIO; 148 149 for (tab = nkmp->table; tab->rate > 0; tab++) 150 if (tab->rate == rate) 151 break; 152 if (tab->rate == 0) 153 return EINVAL; 154 155 val = CCU_READ(sc, nkmp->reg); 156 157 if (nkmp->flags & SUNXI_CCU_NKMP_SCALE_CLOCK) { 158 if (nkmp->p && __SHIFTOUT(val, nkmp->p) < tab->p) { 159 val &= ~nkmp->p; 160 val |= __SHIFTIN(tab->p, nkmp->p); 161 CCU_WRITE(sc, nkmp->reg, val); 162 delay(2000); 163 } 164 if (nkmp->m && __SHIFTOUT(val, nkmp->m) < tab->m) { 165 val &= ~nkmp->m; 166 val |= __SHIFTIN(tab->m, nkmp->m); 167 CCU_WRITE(sc, nkmp->reg, val); 168 delay(2000); 169 } 170 if (nkmp->n) { 171 val &= ~nkmp->n; 172 val |= __SHIFTIN(tab->n, nkmp->n); 173 } 174 if (nkmp->k) { 175 val &= ~nkmp->k; 176 val |= __SHIFTIN(tab->k, nkmp->k); 177 } 178 CCU_WRITE(sc, nkmp->reg, val); 179 delay(2000); 180 if (nkmp->m && __SHIFTOUT(val, nkmp->m) > tab->m) { 181 val &= ~nkmp->m; 182 val |= __SHIFTIN(tab->m, nkmp->m); 183 CCU_WRITE(sc, nkmp->reg, val); 184 delay(2000); 185 } 186 if (nkmp->p && __SHIFTOUT(val, nkmp->p) > tab->p) { 187 val &= ~nkmp->p; 188 val |= __SHIFTIN(tab->p, nkmp->p); 189 CCU_WRITE(sc, nkmp->reg, val); 190 delay(2000); 191 } 192 } else { 193 if (nkmp->n) { 194 val &= ~nkmp->n; 195 val |= __SHIFTIN(tab->n, nkmp->n); 196 } 197 if (nkmp->k) { 198 val &= ~nkmp->k; 199 val |= __SHIFTIN(tab->k, nkmp->k); 200 } 201 if (nkmp->m) { 202 val &= ~nkmp->m; 203 val |= __SHIFTIN(tab->m, nkmp->m); 204 } 205 if (nkmp->p) { 206 val &= ~nkmp->p; 207 val |= __SHIFTIN(tab->p, nkmp->p); 208 } 209 CCU_WRITE(sc, nkmp->reg, val); 210 } 211 212 return 0; 213 } 214 215 const char * 216 sunxi_ccu_nkmp_get_parent(struct sunxi_ccu_softc *sc, 217 struct sunxi_ccu_clk *clk) 218 { 219 struct sunxi_ccu_nkmp *nkmp = &clk->u.nkmp; 220 221 KASSERT(clk->type == SUNXI_CCU_NKMP); 222 223 return nkmp->parent; 224 } 225
Indexes created Sat Sep 20 22:09:52 GMT 2025