1 /* 2 * Copyright 2012 Red Hat Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 * Authors: Ben Skeggs 23 */ 24 #define nv40_clk(p) container_of((p), struct nv40_clk, base) 25 #include "priv.h" 26 #include "pll.h" 27 28 #include <subdev/bios.h> 29 #include <subdev/bios/pll.h> 30 31 struct nv40_clk { 32 struct nvkm_clk base; 33 u32 ctrl; 34 u32 npll_ctrl; 35 u32 npll_coef; 36 u32 spll; 37 }; 38 39 static u32 40 read_pll_1(struct nv40_clk *clk, u32 reg) 41 { 42 struct nvkm_device *device = clk->base.subdev.device; 43 u32 ctrl = nvkm_rd32(device, reg + 0x00); 44 int P = (ctrl & 0x00070000) >> 16; 45 int N = (ctrl & 0x0000ff00) >> 8; 46 int M = (ctrl & 0x000000ff) >> 0; 47 u32 ref = 27000, khz = 0; 48 49 if (ctrl & 0x80000000) 50 khz = ref * N / M; 51 52 return khz >> P; 53 } 54 55 static u32 56 read_pll_2(struct nv40_clk *clk, u32 reg) 57 { 58 struct nvkm_device *device = clk->base.subdev.device; 59 u32 ctrl = nvkm_rd32(device, reg + 0x00); 60 u32 coef = nvkm_rd32(device, reg + 0x04); 61 int N2 = (coef & 0xff000000) >> 24; 62 int M2 = (coef & 0x00ff0000) >> 16; 63 int N1 = (coef & 0x0000ff00) >> 8; 64 int M1 = (coef & 0x000000ff) >> 0; 65 int P = (ctrl & 0x00070000) >> 16; 66 u32 ref = 27000, khz = 0; 67 68 if ((ctrl & 0x80000000) && M1) { 69 khz = ref * N1 / M1; 70 if ((ctrl & 0x40000100) == 0x40000000) { 71 if (M2) 72 khz = khz * N2 / M2; 73 else 74 khz = 0; 75 } 76 } 77 78 return khz >> P; 79 } 80 81 static u32 82 read_clk(struct nv40_clk *clk, u32 src) 83 { 84 switch (src) { 85 case 3: 86 return read_pll_2(clk, 0x004000); 87 case 2: 88 return read_pll_1(clk, 0x004008); 89 default: 90 break; 91 } 92 93 return 0; 94 } 95 96 static int 97 nv40_clk_read(struct nvkm_clk *base, enum nv_clk_src src) 98 { 99 struct nv40_clk *clk = nv40_clk(base); 100 struct nvkm_subdev *subdev = &clk->base.subdev; 101 struct nvkm_device *device = subdev->device; 102 u32 mast = nvkm_rd32(device, 0x00c040); 103 104 switch (src) { 105 case nv_clk_src_crystal: 106 return device->crystal; 107 case nv_clk_src_href: 108 return 100000; /*XXX: PCIE/AGP differ*/ 109 case nv_clk_src_core: 110 return read_clk(clk, (mast & 0x00000003) >> 0); 111 case nv_clk_src_shader: 112 return read_clk(clk, (mast & 0x00000030) >> 4); 113 case nv_clk_src_mem: 114 return read_pll_2(clk, 0x4020); 115 default: 116 break; 117 } 118 119 nvkm_debug(subdev, "unknown clock source %d %08x\n", src, mast); 120 return -EINVAL; 121 } 122 123 static int 124 nv40_clk_calc_pll(struct nv40_clk *clk, u32 reg, u32 khz, 125 int *N1, int *M1, int *N2, int *M2, int *log2P) 126 { 127 struct nvkm_subdev *subdev = &clk->base.subdev; 128 struct nvbios_pll pll; 129 int ret; 130 131 ret = nvbios_pll_parse(subdev->device->bios, reg, &pll); 132 if (ret) 133 return ret; 134 135 if (khz < pll.vco1.max_freq) 136 pll.vco2.max_freq = 0; 137 138 ret = nv04_pll_calc(subdev, &pll, khz, N1, M1, N2, M2, log2P); 139 if (ret == 0) 140 return -ERANGE; 141 142 return ret; 143 } 144 145 static int 146 nv40_clk_calc(struct nvkm_clk *base, struct nvkm_cstate *cstate) 147 { 148 struct nv40_clk *clk = nv40_clk(base); 149 int gclk = cstate->domain[nv_clk_src_core]; 150 int sclk = cstate->domain[nv_clk_src_shader]; 151 int N1, M1, N2, M2, log2P; 152 int ret; 153 154 /* core/geometric clock */ 155 ret = nv40_clk_calc_pll(clk, 0x004000, gclk, 156 &N1, &M1, &N2, &M2, &log2P); 157 if (ret < 0) 158 return ret; 159 160 if (N2 == M2) { 161 clk->npll_ctrl = 0x80000100 | (log2P << 16); 162 clk->npll_coef = (N1 << 8) | M1; 163 } else { 164 clk->npll_ctrl = 0xc0000000 | (log2P << 16); 165 clk->npll_coef = (N2 << 24) | (M2 << 16) | (N1 << 8) | M1; 166 } 167 168 /* use the second pll for shader/rop clock, if it differs from core */ 169 if (sclk && sclk != gclk) { 170 ret = nv40_clk_calc_pll(clk, 0x004008, sclk, 171 &N1, &M1, NULL, NULL, &log2P); 172 if (ret < 0) 173 return ret; 174 175 clk->spll = 0xc0000000 | (log2P << 16) | (N1 << 8) | M1; 176 clk->ctrl = 0x00000223; 177 } else { 178 clk->spll = 0x00000000; 179 clk->ctrl = 0x00000333; 180 } 181 182 return 0; 183 } 184 185 static int 186 nv40_clk_prog(struct nvkm_clk *base) 187 { 188 struct nv40_clk *clk = nv40_clk(base); 189 struct nvkm_device *device = clk->base.subdev.device; 190 nvkm_mask(device, 0x00c040, 0x00000333, 0x00000000); 191 nvkm_wr32(device, 0x004004, clk->npll_coef); 192 nvkm_mask(device, 0x004000, 0xc0070100, clk->npll_ctrl); 193 nvkm_mask(device, 0x004008, 0xc007ffff, clk->spll); 194 mdelay(5); 195 nvkm_mask(device, 0x00c040, 0x00000333, clk->ctrl); 196 return 0; 197 } 198 199 static void 200 nv40_clk_tidy(struct nvkm_clk *obj) 201 { 202 } 203 204 static const struct nvkm_clk_func 205 nv40_clk = { 206 .read = nv40_clk_read, 207 .calc = nv40_clk_calc, 208 .prog = nv40_clk_prog, 209 .tidy = nv40_clk_tidy, 210 .domains = { 211 { nv_clk_src_crystal, 0xff }, 212 { nv_clk_src_href , 0xff }, 213 { nv_clk_src_core , 0xff, 0, "core", 1000 }, 214 { nv_clk_src_shader , 0xff, 0, "shader", 1000 }, 215 { nv_clk_src_mem , 0xff, 0, "memory", 1000 }, 216 { nv_clk_src_max } 217 } 218 }; 219 220 int 221 nv40_clk_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst, 222 struct nvkm_clk **pclk) 223 { 224 struct nv40_clk *clk; 225 226 if (!(clk = kzalloc(sizeof(*clk), GFP_KERNEL))) 227 return -ENOMEM; 228 clk->base.pll_calc = nv04_clk_pll_calc; 229 clk->base.pll_prog = nv04_clk_pll_prog; 230 *pclk = &clk->base; 231 232 return nvkm_clk_ctor(&nv40_clk, device, type, inst, true, &clk->base); 233 } 234