arch/mips/lantiq/xway/clk.c

   1 /*
   2  *  This program is free software; you can redistribute it and/or modify it
   3  *  under the terms of the GNU General Public License version 2 as published
   4  *  by the Free Software Foundation.
   5  *
   6  *  Copyright (C) 2010 John Crispin <john@phrozen.org>
   7  *  Copyright (C) 2013-2015 Lantiq Beteiligungs-GmbH & Co.KG
   8  */
   9
  10 #include <linux/io.h>
  11 #include <linux/export.h>
  12 #include <linux/clk.h>
  13
  14 #include <asm/time.h>
  15 #include <asm/irq.h>
  16 #include <asm/div64.h>
  17
  18 #include <lantiq_soc.h>
  19
  20 #include "../clk.h"
  21
  22 static unsigned int ram_clocks[] = {
  23         CLOCK_167M, CLOCK_133M, CLOCK_111M, CLOCK_83M };
  24 #define DDR_HZ ram_clocks[ltq_cgu_r32(CGU_SYS) & 0x3]
  25
  26 /* legacy xway clock */
  27 #define CGU_SYS                 0x10
  28
  29 /* vr9, ar10/grx390 clock */
  30 #define CGU_SYS_XRX             0x0c
  31 #define CGU_IF_CLK_AR10         0x24
  32
  33 unsigned long ltq_danube_fpi_hz(void)
  34 {
  35         unsigned long ddr_clock = DDR_HZ;
  36
  37         if (ltq_cgu_r32(CGU_SYS) & 0x40)
  38                 return ddr_clock >> 1;
  39         return ddr_clock;
  40 }
  41
  42 unsigned long ltq_danube_cpu_hz(void)
  43 {
  44         switch (ltq_cgu_r32(CGU_SYS) & 0xc) {
  45         case 0:
  46                 return CLOCK_333M;
  47         case 4:
  48                 return DDR_HZ;
  49         case 8:
  50                 return DDR_HZ << 1;
  51         default:
  52                 return DDR_HZ >> 1;
  53         }
  54 }
  55
  56 unsigned long ltq_danube_pp32_hz(void)
  57 {
  58         unsigned int clksys = (ltq_cgu_r32(CGU_SYS) >> 7) & 3;
  59         unsigned long clk;
  60
  61         switch (clksys) {
  62         case 1:
  63                 clk = CLOCK_240M;
  64                 break;
  65         case 2:
  66                 clk = CLOCK_222M;
  67                 break;
  68         case 3:
  69                 clk = CLOCK_133M;
  70                 break;
  71         default:
  72                 clk = CLOCK_266M;
  73                 break;
  74         }
  75
  76         return clk;
  77 }
  78
  79 unsigned long ltq_ar9_sys_hz(void)
  80 {
  81         if (((ltq_cgu_r32(CGU_SYS) >> 3) & 0x3) == 0x2)
  82                 return CLOCK_393M;
  83         return CLOCK_333M;
  84 }
  85
  86 unsigned long ltq_ar9_fpi_hz(void)
  87 {
  88         unsigned long sys = ltq_ar9_sys_hz();
  89
  90         if (ltq_cgu_r32(CGU_SYS) & BIT(0))
  91                 return sys / 3;
  92         else
  93                 return sys / 2;
  94 }
  95
  96 unsigned long ltq_ar9_cpu_hz(void)
  97 {
  98         if (ltq_cgu_r32(CGU_SYS) & BIT(2))
  99                 return ltq_ar9_fpi_hz();
 100         else
 101                 return ltq_ar9_sys_hz();
 102 }
 103
 104 unsigned long ltq_vr9_cpu_hz(void)
 105 {
 106         unsigned int cpu_sel;
 107         unsigned long clk;
 108
 109         cpu_sel = (ltq_cgu_r32(CGU_SYS_XRX) >> 4) & 0xf;
 110
 111         switch (cpu_sel) {
 112         case 0:
 113                 clk = CLOCK_600M;
 114                 break;
 115         case 1:
 116                 clk = CLOCK_500M;
 117                 break;
 118         case 2:
 119                 clk = CLOCK_393M;
 120                 break;
 121         case 3:
 122                 clk = CLOCK_333M;
 123                 break;
 124         case 5:
 125         case 6:
 126                 clk = CLOCK_196_608M;
 127                 break;
 128         case 7:
 129                 clk = CLOCK_167M;
 130                 break;
 131         case 4:
 132         case 8:
 133         case 9:
 134                 clk = CLOCK_125M;
 135                 break;
 136         default:
 137                 clk = 0;
 138                 break;
 139         }
 140
 141         return clk;
 142 }
 143
 144 unsigned long ltq_vr9_fpi_hz(void)
 145 {
 146         unsigned int ocp_sel, cpu_clk;
 147         unsigned long clk;
 148
 149         cpu_clk = ltq_vr9_cpu_hz();
 150         ocp_sel = ltq_cgu_r32(CGU_SYS_XRX) & 0x3;
 151
 152         switch (ocp_sel) {
 153         case 0:
 154                 /* OCP ratio 1 */
 155                 clk = cpu_clk;
 156                 break;
 157         case 2:
 158                 /* OCP ratio 2 */
 159                 clk = cpu_clk / 2;
 160                 break;
 161         case 3:
 162                 /* OCP ratio 2.5 */
 163                 clk = (cpu_clk * 2) / 5;
 164                 break;
 165         case 4:
 166                 /* OCP ratio 3 */
 167                 clk = cpu_clk / 3;
 168                 break;
 169         default:
 170                 clk = 0;
 171                 break;
 172         }
 173
 174         return clk;
 175 }
 176
 177 unsigned long ltq_vr9_pp32_hz(void)
 178 {
 179         unsigned int clksys = (ltq_cgu_r32(CGU_SYS) >> 16) & 0x7;
 180         unsigned long clk;
 181
 182         switch (clksys) {
 183         case 0:
 184                 clk = CLOCK_500M;
 185                 break;
 186         case 1:
 187                 clk = CLOCK_432M;
 188                 break;
 189         case 2:
 190                 clk = CLOCK_288M;
 191                 break;
 192         default:
 193                 clk = CLOCK_500M;
 194                 break;
 195         }
 196
 197         return clk;
 198 }
 199
 200 unsigned long ltq_ar10_cpu_hz(void)
 201 {
 202         unsigned int clksys;
 203         int cpu_fs = (ltq_cgu_r32(CGU_SYS_XRX) >> 8) & 0x1;
 204         int freq_div = (ltq_cgu_r32(CGU_SYS_XRX) >> 4) & 0x7;
 205
 206         switch (cpu_fs) {
 207         case 0:
 208                 clksys = CLOCK_500M;
 209                 break;
 210         case 1:
 211                 clksys = CLOCK_600M;
 212                 break;
 213         default:
 214                 clksys = CLOCK_500M;
 215                 break;
 216         }
 217
 218         switch (freq_div) {
 219         case 0:
 220                 return clksys;
 221         case 1:
 222                 return clksys >> 1;
 223         case 2:
 224                 return clksys >> 2;
 225         default:
 226                 return clksys;
 227         }
 228 }
 229
 230 unsigned long ltq_ar10_fpi_hz(void)
 231 {
 232         int freq_fpi = (ltq_cgu_r32(CGU_IF_CLK_AR10) >> 25) & 0xf;
 233
 234         switch (freq_fpi) {
 235         case 1:
 236                 return CLOCK_300M;
 237         case 5:
 238                 return CLOCK_250M;
 239         case 2:
 240                 return CLOCK_150M;
 241         case 6:
 242                 return CLOCK_125M;
 243
 244         default:
 245                 return CLOCK_125M;
 246         }
 247 }
 248
 249 unsigned long ltq_ar10_pp32_hz(void)
 250 {
 251         unsigned int clksys = (ltq_cgu_r32(CGU_SYS) >> 16) & 0x7;
 252         unsigned long clk;
 253
 254         switch (clksys) {
 255         case 1:
 256                 clk = CLOCK_250M;
 257                 break;
 258         case 4:
 259                 clk = CLOCK_400M;
 260                 break;
 261         default:
 262                 clk = CLOCK_250M;
 263                 break;
 264         }
 265
 266         return clk;
 267 }
 268
 269 unsigned long ltq_grx390_cpu_hz(void)
 270 {
 271         unsigned int clksys;
 272         int cpu_fs = ((ltq_cgu_r32(CGU_SYS_XRX) >> 9) & 0x3);
 273         int freq_div = ((ltq_cgu_r32(CGU_SYS_XRX) >> 4) & 0x7);
 274
 275         switch (cpu_fs) {
 276         case 0:
 277                 clksys = CLOCK_600M;
 278                 break;
 279         case 1:
 280                 clksys = CLOCK_666M;
 281                 break;
 282         case 2:
 283                 clksys = CLOCK_720M;
 284                 break;
 285         default:
 286                 clksys = CLOCK_600M;
 287                 break;
 288         }
 289
 290         switch (freq_div) {
 291         case 0:
 292                 return clksys;
 293         case 1:
 294                 return clksys >> 1;
 295         case 2:
 296                 return clksys >> 2;
 297         default:
 298                 return clksys;
 299         }
 300 }
 301
 302 unsigned long ltq_grx390_fpi_hz(void)
 303 {
 304         /* fpi clock is derived from ddr_clk */
 305         unsigned int clksys;
 306         int cpu_fs = ((ltq_cgu_r32(CGU_SYS_XRX) >> 9) & 0x3);
 307         int freq_div = ((ltq_cgu_r32(CGU_SYS_XRX)) & 0x7);
 308         switch (cpu_fs) {
 309         case 0:
 310                 clksys = CLOCK_600M;
 311                 break;
 312         case 1:
 313                 clksys = CLOCK_666M;
 314                 break;
 315         case 2:
 316                 clksys = CLOCK_720M;
 317                 break;
 318         default:
 319                 clksys = CLOCK_600M;
 320                 break;
 321         }
 322
 323         switch (freq_div) {
 324         case 1:
 325                 return clksys >> 1;
 326         case 2:
 327                 return clksys >> 2;
 328         default:
 329                 return clksys >> 1;
 330         }
 331 }
 332
 333 unsigned long ltq_grx390_pp32_hz(void)
 334 {
 335         unsigned int clksys = (ltq_cgu_r32(CGU_SYS) >> 16) & 0x7;
 336         unsigned long clk;
 337
 338         switch (clksys) {
 339         case 1:
 340                 clk = CLOCK_250M;
 341                 break;
 342         case 2:
 343                 clk = CLOCK_432M;
 344                 break;
 345         case 4:
 346                 clk = CLOCK_400M;
 347                 break;
 348         default:
 349                 clk = CLOCK_250M;
 350                 break;
 351         }
 352         return clk;
 353 }