arch/mips/ath79/clock.c

   1 /*
   2  *  Atheros AR71XX/AR724X/AR913X common routines
   3  *
   4  *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
   5  *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
   6  *
   7  *  Parts of this file are based on Atheros' 2.6.15/2.6.31 BSP
   8  *
   9  *  This program is free software; you can redistribute it and/or modify it
  10  *  under the terms of the GNU General Public License version 2 as published
  11  *  by the Free Software Foundation.
  12  */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/err.h>
  17 #include <linux/clk.h>
  18 #include <linux/clkdev.h>
  19 #include <linux/clk-provider.h>
  20 #include <linux/of.h>
  21 #include <linux/of_address.h>
  22 #include <dt-bindings/clock/ath79-clk.h>
  23
  24 #include <asm/div64.h>
  25
  26 #include <asm/mach-ath79/ath79.h>
  27 #include <asm/mach-ath79/ar71xx_regs.h>
  28 #include "common.h"
  29 #include "machtypes.h"
  30
  31 #define AR71XX_BASE_FREQ        40000000
  32 #define AR724X_BASE_FREQ        40000000
  33
  34 static struct clk *clks[ATH79_CLK_END];
  35 static struct clk_onecell_data clk_data = {
  36         .clks = clks,
  37         .clk_num = ARRAY_SIZE(clks),
  38 };
  39
  40 static struct clk *__init ath79_add_sys_clkdev(
  41         const char *id, unsigned long rate)
  42 {
  43         struct clk *clk;
  44         int err;
  45
  46         clk = clk_register_fixed_rate(NULL, id, NULL, 0, rate);
  47         if (IS_ERR(clk))
  48                 panic("failed to allocate %s clock structure", id);
  49
  50         err = clk_register_clkdev(clk, id, NULL);
  51         if (err)
  52                 panic("unable to register %s clock device", id);
  53
  54         return clk;
  55 }
  56
  57 static void __init ar71xx_clocks_init(void)
  58 {
  59         unsigned long ref_rate;
  60         unsigned long cpu_rate;
  61         unsigned long ddr_rate;
  62         unsigned long ahb_rate;
  63         u32 pll;
  64         u32 freq;
  65         u32 div;
  66
  67         ref_rate = AR71XX_BASE_FREQ;
  68
  69         pll = ath79_pll_rr(AR71XX_PLL_REG_CPU_CONFIG);
  70
  71         div = ((pll >> AR71XX_PLL_FB_SHIFT) & AR71XX_PLL_FB_MASK) + 1;
  72         freq = div * ref_rate;
  73
  74         div = ((pll >> AR71XX_CPU_DIV_SHIFT) & AR71XX_CPU_DIV_MASK) + 1;
  75         cpu_rate = freq / div;
  76
  77         div = ((pll >> AR71XX_DDR_DIV_SHIFT) & AR71XX_DDR_DIV_MASK) + 1;
  78         ddr_rate = freq / div;
  79
  80         div = (((pll >> AR71XX_AHB_DIV_SHIFT) & AR71XX_AHB_DIV_MASK) + 1) * 2;
  81         ahb_rate = cpu_rate / div;
  82
  83         ath79_add_sys_clkdev("ref", ref_rate);
  84         clks[ATH79_CLK_CPU] = ath79_add_sys_clkdev("cpu", cpu_rate);
  85         clks[ATH79_CLK_DDR] = ath79_add_sys_clkdev("ddr", ddr_rate);
  86         clks[ATH79_CLK_AHB] = ath79_add_sys_clkdev("ahb", ahb_rate);
  87
  88         clk_add_alias("wdt", NULL, "ahb", NULL);
  89         clk_add_alias("uart", NULL, "ahb", NULL);
  90 }
  91
  92 static struct clk * __init ath79_reg_ffclk(const char *name,
  93                 const char *parent_name, unsigned int mult, unsigned int div)
  94 {
  95         struct clk *clk;
  96
  97         clk = clk_register_fixed_factor(NULL, name, parent_name, 0, mult, div);
  98         if (IS_ERR(clk))
  99                 panic("failed to allocate %s clock structure", name);
 100
 101         return clk;
 102 }
 103
 104 static void __init ar724x_clk_init(struct clk *ref_clk, void __iomem *pll_base)
 105 {
 106         u32 pll;
 107         u32 mult, div, ddr_div, ahb_div;
 108
 109         pll = __raw_readl(pll_base + AR724X_PLL_REG_CPU_CONFIG);
 110
 111         mult = ((pll >> AR724X_PLL_FB_SHIFT) & AR724X_PLL_FB_MASK);
 112         div = ((pll >> AR724X_PLL_REF_DIV_SHIFT) & AR724X_PLL_REF_DIV_MASK) * 2;
 113
 114         ddr_div = ((pll >> AR724X_DDR_DIV_SHIFT) & AR724X_DDR_DIV_MASK) + 1;
 115         ahb_div = (((pll >> AR724X_AHB_DIV_SHIFT) & AR724X_AHB_DIV_MASK) + 1) * 2;
 116
 117         clks[ATH79_CLK_CPU] = ath79_reg_ffclk("cpu", "ref", mult, div);
 118         clks[ATH79_CLK_DDR] = ath79_reg_ffclk("ddr", "ref", mult, div * ddr_div);
 119         clks[ATH79_CLK_AHB] = ath79_reg_ffclk("ahb", "ref", mult, div * ahb_div);
 120 }
 121
 122 static void __init ar724x_clocks_init(void)
 123 {
 124         struct clk *ref_clk;
 125
 126         ref_clk = ath79_add_sys_clkdev("ref", AR724X_BASE_FREQ);
 127
 128         ar724x_clk_init(ref_clk, ath79_pll_base);
 129
 130         /* just make happy plat_time_init() from arch/mips/ath79/setup.c */
 131         clk_register_clkdev(clks[ATH79_CLK_CPU], "cpu", NULL);
 132         clk_register_clkdev(clks[ATH79_CLK_DDR], "ddr", NULL);
 133         clk_register_clkdev(clks[ATH79_CLK_AHB], "ahb", NULL);
 134
 135         clk_add_alias("wdt", NULL, "ahb", NULL);
 136         clk_add_alias("uart", NULL, "ahb", NULL);
 137 }
 138
 139 static void __init ar9330_clk_init(struct clk *ref_clk, void __iomem *pll_base)
 140 {
 141         u32 clock_ctrl;
 142         u32 ref_div;
 143         u32 ninit_mul;
 144         u32 out_div;
 145
 146         u32 cpu_div;
 147         u32 ddr_div;
 148         u32 ahb_div;
 149
 150         clock_ctrl = __raw_readl(pll_base + AR933X_PLL_CLOCK_CTRL_REG);
 151         if (clock_ctrl & AR933X_PLL_CLOCK_CTRL_BYPASS) {
 152                 ref_div = 1;
 153                 ninit_mul = 1;
 154                 out_div = 1;
 155
 156                 cpu_div = 1;
 157                 ddr_div = 1;
 158                 ahb_div = 1;
 159         } else {
 160                 u32 cpu_config;
 161                 u32 t;
 162
 163                 cpu_config = __raw_readl(pll_base + AR933X_PLL_CPU_CONFIG_REG);
 164
 165                 t = (cpu_config >> AR933X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
 166                     AR933X_PLL_CPU_CONFIG_REFDIV_MASK;
 167                 ref_div = t;
 168
 169                 ninit_mul = (cpu_config >> AR933X_PLL_CPU_CONFIG_NINT_SHIFT) &
 170                     AR933X_PLL_CPU_CONFIG_NINT_MASK;
 171
 172                 t = (cpu_config >> AR933X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
 173                     AR933X_PLL_CPU_CONFIG_OUTDIV_MASK;
 174                 if (t == 0)
 175                         t = 1;
 176
 177                 out_div = (1 << t);
 178
 179                 cpu_div = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_CPU_DIV_SHIFT) &
 180                      AR933X_PLL_CLOCK_CTRL_CPU_DIV_MASK) + 1;
 181
 182                 ddr_div = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_DDR_DIV_SHIFT) &
 183                       AR933X_PLL_CLOCK_CTRL_DDR_DIV_MASK) + 1;
 184
 185                 ahb_div = ((clock_ctrl >> AR933X_PLL_CLOCK_CTRL_AHB_DIV_SHIFT) &
 186                      AR933X_PLL_CLOCK_CTRL_AHB_DIV_MASK) + 1;
 187         }
 188
 189         clks[ATH79_CLK_CPU] = ath79_reg_ffclk("cpu", "ref",
 190                                         ninit_mul, ref_div * out_div * cpu_div);
 191         clks[ATH79_CLK_DDR] = ath79_reg_ffclk("ddr", "ref",
 192                                         ninit_mul, ref_div * out_div * ddr_div);
 193         clks[ATH79_CLK_AHB] = ath79_reg_ffclk("ahb", "ref",
 194                                         ninit_mul, ref_div * out_div * ahb_div);
 195 }
 196
 197 static void __init ar933x_clocks_init(void)
 198 {
 199         struct clk *ref_clk;
 200         unsigned long ref_rate;
 201         u32 t;
 202
 203         t = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP);
 204         if (t & AR933X_BOOTSTRAP_REF_CLK_40)
 205                 ref_rate = (40 * 1000 * 1000);
 206         else
 207                 ref_rate = (25 * 1000 * 1000);
 208
 209         ref_clk = ath79_add_sys_clkdev("ref", ref_rate);
 210
 211         ar9330_clk_init(ref_clk, ath79_pll_base);
 212
 213         /* just make happy plat_time_init() from arch/mips/ath79/setup.c */
 214         clk_register_clkdev(clks[ATH79_CLK_CPU], "cpu", NULL);
 215         clk_register_clkdev(clks[ATH79_CLK_DDR], "ddr", NULL);
 216         clk_register_clkdev(clks[ATH79_CLK_AHB], "ahb", NULL);
 217
 218         clk_add_alias("wdt", NULL, "ahb", NULL);
 219         clk_add_alias("uart", NULL, "ref", NULL);
 220 }
 221
 222 static u32 __init ar934x_get_pll_freq(u32 ref, u32 ref_div, u32 nint, u32 nfrac,
 223                                       u32 frac, u32 out_div)
 224 {
 225         u64 t;
 226         u32 ret;
 227
 228         t = ref;
 229         t *= nint;
 230         do_div(t, ref_div);
 231         ret = t;
 232
 233         t = ref;
 234         t *= nfrac;
 235         do_div(t, ref_div * frac);
 236         ret += t;
 237
 238         ret /= (1 << out_div);
 239         return ret;
 240 }
 241
 242 static void __init ar934x_clocks_init(void)
 243 {
 244         unsigned long ref_rate;
 245         unsigned long cpu_rate;
 246         unsigned long ddr_rate;
 247         unsigned long ahb_rate;
 248         u32 pll, out_div, ref_div, nint, nfrac, frac, clk_ctrl, postdiv;
 249         u32 cpu_pll, ddr_pll;
 250         u32 bootstrap;
 251         void __iomem *dpll_base;
 252
 253         dpll_base = ioremap(AR934X_SRIF_BASE, AR934X_SRIF_SIZE);
 254
 255         bootstrap = ath79_reset_rr(AR934X_RESET_REG_BOOTSTRAP);
 256         if (bootstrap & AR934X_BOOTSTRAP_REF_CLK_40)
 257                 ref_rate = 40 * 1000 * 1000;
 258         else
 259                 ref_rate = 25 * 1000 * 1000;
 260
 261         pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL2_REG);
 262         if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
 263                 out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
 264                           AR934X_SRIF_DPLL2_OUTDIV_MASK;
 265                 pll = __raw_readl(dpll_base + AR934X_SRIF_CPU_DPLL1_REG);
 266                 nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
 267                        AR934X_SRIF_DPLL1_NINT_MASK;
 268                 nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
 269                 ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
 270                           AR934X_SRIF_DPLL1_REFDIV_MASK;
 271                 frac = 1 << 18;
 272         } else {
 273                 pll = ath79_pll_rr(AR934X_PLL_CPU_CONFIG_REG);
 274                 out_div = (pll >> AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
 275                         AR934X_PLL_CPU_CONFIG_OUTDIV_MASK;
 276                 ref_div = (pll >> AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
 277                           AR934X_PLL_CPU_CONFIG_REFDIV_MASK;
 278                 nint = (pll >> AR934X_PLL_CPU_CONFIG_NINT_SHIFT) &
 279                        AR934X_PLL_CPU_CONFIG_NINT_MASK;
 280                 nfrac = (pll >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
 281                         AR934X_PLL_CPU_CONFIG_NFRAC_MASK;
 282                 frac = 1 << 6;
 283         }
 284
 285         cpu_pll = ar934x_get_pll_freq(ref_rate, ref_div, nint,
 286                                       nfrac, frac, out_div);
 287
 288         pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL2_REG);
 289         if (pll & AR934X_SRIF_DPLL2_LOCAL_PLL) {
 290                 out_div = (pll >> AR934X_SRIF_DPLL2_OUTDIV_SHIFT) &
 291                           AR934X_SRIF_DPLL2_OUTDIV_MASK;
 292                 pll = __raw_readl(dpll_base + AR934X_SRIF_DDR_DPLL1_REG);
 293                 nint = (pll >> AR934X_SRIF_DPLL1_NINT_SHIFT) &
 294                        AR934X_SRIF_DPLL1_NINT_MASK;
 295                 nfrac = pll & AR934X_SRIF_DPLL1_NFRAC_MASK;
 296                 ref_div = (pll >> AR934X_SRIF_DPLL1_REFDIV_SHIFT) &
 297                           AR934X_SRIF_DPLL1_REFDIV_MASK;
 298                 frac = 1 << 18;
 299         } else {
 300                 pll = ath79_pll_rr(AR934X_PLL_DDR_CONFIG_REG);
 301                 out_div = (pll >> AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
 302                           AR934X_PLL_DDR_CONFIG_OUTDIV_MASK;
 303                 ref_div = (pll >> AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
 304                            AR934X_PLL_DDR_CONFIG_REFDIV_MASK;
 305                 nint = (pll >> AR934X_PLL_DDR_CONFIG_NINT_SHIFT) &
 306                        AR934X_PLL_DDR_CONFIG_NINT_MASK;
 307                 nfrac = (pll >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
 308                         AR934X_PLL_DDR_CONFIG_NFRAC_MASK;
 309                 frac = 1 << 10;
 310         }
 311
 312         ddr_pll = ar934x_get_pll_freq(ref_rate, ref_div, nint,
 313                                       nfrac, frac, out_div);
 314
 315         clk_ctrl = ath79_pll_rr(AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
 316
 317         postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_SHIFT) &
 318                   AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_POST_DIV_MASK;
 319
 320         if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPU_PLL_BYPASS)
 321                 cpu_rate = ref_rate;
 322         else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_CPUCLK_FROM_CPUPLL)
 323                 cpu_rate = cpu_pll / (postdiv + 1);
 324         else
 325                 cpu_rate = ddr_pll / (postdiv + 1);
 326
 327         postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_SHIFT) &
 328                   AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_POST_DIV_MASK;
 329
 330         if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDR_PLL_BYPASS)
 331                 ddr_rate = ref_rate;
 332         else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_DDRCLK_FROM_DDRPLL)
 333                 ddr_rate = ddr_pll / (postdiv + 1);
 334         else
 335                 ddr_rate = cpu_pll / (postdiv + 1);
 336
 337         postdiv = (clk_ctrl >> AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_SHIFT) &
 338                   AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_POST_DIV_MASK;
 339
 340         if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHB_PLL_BYPASS)
 341                 ahb_rate = ref_rate;
 342         else if (clk_ctrl & AR934X_PLL_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL)
 343                 ahb_rate = ddr_pll / (postdiv + 1);
 344         else
 345                 ahb_rate = cpu_pll / (postdiv + 1);
 346
 347         ath79_add_sys_clkdev("ref", ref_rate);
 348         clks[ATH79_CLK_CPU] = ath79_add_sys_clkdev("cpu", cpu_rate);
 349         clks[ATH79_CLK_DDR] = ath79_add_sys_clkdev("ddr", ddr_rate);
 350         clks[ATH79_CLK_AHB] = ath79_add_sys_clkdev("ahb", ahb_rate);
 351
 352         clk_add_alias("wdt", NULL, "ref", NULL);
 353         clk_add_alias("uart", NULL, "ref", NULL);
 354
 355         iounmap(dpll_base);
 356 }
 357
 358 static void __init qca953x_clocks_init(void)
 359 {
 360         unsigned long ref_rate;
 361         unsigned long cpu_rate;
 362         unsigned long ddr_rate;
 363         unsigned long ahb_rate;
 364         u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv;
 365         u32 cpu_pll, ddr_pll;
 366         u32 bootstrap;
 367
 368         bootstrap = ath79_reset_rr(QCA953X_RESET_REG_BOOTSTRAP);
 369         if (bootstrap & QCA953X_BOOTSTRAP_REF_CLK_40)
 370                 ref_rate = 40 * 1000 * 1000;
 371         else
 372                 ref_rate = 25 * 1000 * 1000;
 373
 374         pll = ath79_pll_rr(QCA953X_PLL_CPU_CONFIG_REG);
 375         out_div = (pll >> QCA953X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
 376                   QCA953X_PLL_CPU_CONFIG_OUTDIV_MASK;
 377         ref_div = (pll >> QCA953X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
 378                   QCA953X_PLL_CPU_CONFIG_REFDIV_MASK;
 379         nint = (pll >> QCA953X_PLL_CPU_CONFIG_NINT_SHIFT) &
 380                QCA953X_PLL_CPU_CONFIG_NINT_MASK;
 381         frac = (pll >> QCA953X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
 382                QCA953X_PLL_CPU_CONFIG_NFRAC_MASK;
 383
 384         cpu_pll = nint * ref_rate / ref_div;
 385         cpu_pll += frac * (ref_rate >> 6) / ref_div;
 386         cpu_pll /= (1 << out_div);
 387
 388         pll = ath79_pll_rr(QCA953X_PLL_DDR_CONFIG_REG);
 389         out_div = (pll >> QCA953X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
 390                   QCA953X_PLL_DDR_CONFIG_OUTDIV_MASK;
 391         ref_div = (pll >> QCA953X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
 392                   QCA953X_PLL_DDR_CONFIG_REFDIV_MASK;
 393         nint = (pll >> QCA953X_PLL_DDR_CONFIG_NINT_SHIFT) &
 394                QCA953X_PLL_DDR_CONFIG_NINT_MASK;
 395         frac = (pll >> QCA953X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
 396                QCA953X_PLL_DDR_CONFIG_NFRAC_MASK;
 397
 398         ddr_pll = nint * ref_rate / ref_div;
 399         ddr_pll += frac * (ref_rate >> 6) / (ref_div << 4);
 400         ddr_pll /= (1 << out_div);
 401
 402         clk_ctrl = ath79_pll_rr(QCA953X_PLL_CLK_CTRL_REG);
 403
 404         postdiv = (clk_ctrl >> QCA953X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) &
 405                   QCA953X_PLL_CLK_CTRL_CPU_POST_DIV_MASK;
 406
 407         if (clk_ctrl & QCA953X_PLL_CLK_CTRL_CPU_PLL_BYPASS)
 408                 cpu_rate = ref_rate;
 409         else if (clk_ctrl & QCA953X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL)
 410                 cpu_rate = cpu_pll / (postdiv + 1);
 411         else
 412                 cpu_rate = ddr_pll / (postdiv + 1);
 413
 414         postdiv = (clk_ctrl >> QCA953X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) &
 415                   QCA953X_PLL_CLK_CTRL_DDR_POST_DIV_MASK;
 416
 417         if (clk_ctrl & QCA953X_PLL_CLK_CTRL_DDR_PLL_BYPASS)
 418                 ddr_rate = ref_rate;
 419         else if (clk_ctrl & QCA953X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL)
 420                 ddr_rate = ddr_pll / (postdiv + 1);
 421         else
 422                 ddr_rate = cpu_pll / (postdiv + 1);
 423
 424         postdiv = (clk_ctrl >> QCA953X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) &
 425                   QCA953X_PLL_CLK_CTRL_AHB_POST_DIV_MASK;
 426
 427         if (clk_ctrl & QCA953X_PLL_CLK_CTRL_AHB_PLL_BYPASS)
 428                 ahb_rate = ref_rate;
 429         else if (clk_ctrl & QCA953X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL)
 430                 ahb_rate = ddr_pll / (postdiv + 1);
 431         else
 432                 ahb_rate = cpu_pll / (postdiv + 1);
 433
 434         ath79_add_sys_clkdev("ref", ref_rate);
 435         ath79_add_sys_clkdev("cpu", cpu_rate);
 436         ath79_add_sys_clkdev("ddr", ddr_rate);
 437         ath79_add_sys_clkdev("ahb", ahb_rate);
 438
 439         clk_add_alias("wdt", NULL, "ref", NULL);
 440         clk_add_alias("uart", NULL, "ref", NULL);
 441 }
 442
 443 static void __init qca955x_clocks_init(void)
 444 {
 445         unsigned long ref_rate;
 446         unsigned long cpu_rate;
 447         unsigned long ddr_rate;
 448         unsigned long ahb_rate;
 449         u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv;
 450         u32 cpu_pll, ddr_pll;
 451         u32 bootstrap;
 452
 453         bootstrap = ath79_reset_rr(QCA955X_RESET_REG_BOOTSTRAP);
 454         if (bootstrap & QCA955X_BOOTSTRAP_REF_CLK_40)
 455                 ref_rate = 40 * 1000 * 1000;
 456         else
 457                 ref_rate = 25 * 1000 * 1000;
 458
 459         pll = ath79_pll_rr(QCA955X_PLL_CPU_CONFIG_REG);
 460         out_div = (pll >> QCA955X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
 461                   QCA955X_PLL_CPU_CONFIG_OUTDIV_MASK;
 462         ref_div = (pll >> QCA955X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
 463                   QCA955X_PLL_CPU_CONFIG_REFDIV_MASK;
 464         nint = (pll >> QCA955X_PLL_CPU_CONFIG_NINT_SHIFT) &
 465                QCA955X_PLL_CPU_CONFIG_NINT_MASK;
 466         frac = (pll >> QCA955X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
 467                QCA955X_PLL_CPU_CONFIG_NFRAC_MASK;
 468
 469         cpu_pll = nint * ref_rate / ref_div;
 470         cpu_pll += frac * ref_rate / (ref_div * (1 << 6));
 471         cpu_pll /= (1 << out_div);
 472
 473         pll = ath79_pll_rr(QCA955X_PLL_DDR_CONFIG_REG);
 474         out_div = (pll >> QCA955X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
 475                   QCA955X_PLL_DDR_CONFIG_OUTDIV_MASK;
 476         ref_div = (pll >> QCA955X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
 477                   QCA955X_PLL_DDR_CONFIG_REFDIV_MASK;
 478         nint = (pll >> QCA955X_PLL_DDR_CONFIG_NINT_SHIFT) &
 479                QCA955X_PLL_DDR_CONFIG_NINT_MASK;
 480         frac = (pll >> QCA955X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
 481                QCA955X_PLL_DDR_CONFIG_NFRAC_MASK;
 482
 483         ddr_pll = nint * ref_rate / ref_div;
 484         ddr_pll += frac * ref_rate / (ref_div * (1 << 10));
 485         ddr_pll /= (1 << out_div);
 486
 487         clk_ctrl = ath79_pll_rr(QCA955X_PLL_CLK_CTRL_REG);
 488
 489         postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) &
 490                   QCA955X_PLL_CLK_CTRL_CPU_POST_DIV_MASK;
 491
 492         if (clk_ctrl & QCA955X_PLL_CLK_CTRL_CPU_PLL_BYPASS)
 493                 cpu_rate = ref_rate;
 494         else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL)
 495                 cpu_rate = ddr_pll / (postdiv + 1);
 496         else
 497                 cpu_rate = cpu_pll / (postdiv + 1);
 498
 499         postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) &
 500                   QCA955X_PLL_CLK_CTRL_DDR_POST_DIV_MASK;
 501
 502         if (clk_ctrl & QCA955X_PLL_CLK_CTRL_DDR_PLL_BYPASS)
 503                 ddr_rate = ref_rate;
 504         else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL)
 505                 ddr_rate = cpu_pll / (postdiv + 1);
 506         else
 507                 ddr_rate = ddr_pll / (postdiv + 1);
 508
 509         postdiv = (clk_ctrl >> QCA955X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) &
 510                   QCA955X_PLL_CLK_CTRL_AHB_POST_DIV_MASK;
 511
 512         if (clk_ctrl & QCA955X_PLL_CLK_CTRL_AHB_PLL_BYPASS)
 513                 ahb_rate = ref_rate;
 514         else if (clk_ctrl & QCA955X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL)
 515                 ahb_rate = ddr_pll / (postdiv + 1);
 516         else
 517                 ahb_rate = cpu_pll / (postdiv + 1);
 518
 519         ath79_add_sys_clkdev("ref", ref_rate);
 520         clks[ATH79_CLK_CPU] = ath79_add_sys_clkdev("cpu", cpu_rate);
 521         clks[ATH79_CLK_DDR] = ath79_add_sys_clkdev("ddr", ddr_rate);
 522         clks[ATH79_CLK_AHB] = ath79_add_sys_clkdev("ahb", ahb_rate);
 523
 524         clk_add_alias("wdt", NULL, "ref", NULL);
 525         clk_add_alias("uart", NULL, "ref", NULL);
 526 }
 527
 528 static void __init qca956x_clocks_init(void)
 529 {
 530         unsigned long ref_rate;
 531         unsigned long cpu_rate;
 532         unsigned long ddr_rate;
 533         unsigned long ahb_rate;
 534         u32 pll, out_div, ref_div, nint, hfrac, lfrac, clk_ctrl, postdiv;
 535         u32 cpu_pll, ddr_pll;
 536         u32 bootstrap;
 537
 538         /*
 539          * QCA956x timer init workaround has to be applied right before setting
 540          * up the clock. Else, there will be no jiffies
 541          */
 542         u32 misc;
 543
 544         misc = ath79_reset_rr(AR71XX_RESET_REG_MISC_INT_ENABLE);
 545         misc |= MISC_INT_MIPS_SI_TIMERINT_MASK;
 546         ath79_reset_wr(AR71XX_RESET_REG_MISC_INT_ENABLE, misc);
 547
 548         bootstrap = ath79_reset_rr(QCA956X_RESET_REG_BOOTSTRAP);
 549         if (bootstrap & QCA956X_BOOTSTRAP_REF_CLK_40)
 550                 ref_rate = 40 * 1000 * 1000;
 551         else
 552                 ref_rate = 25 * 1000 * 1000;
 553
 554         pll = ath79_pll_rr(QCA956X_PLL_CPU_CONFIG_REG);
 555         out_div = (pll >> QCA956X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
 556                   QCA956X_PLL_CPU_CONFIG_OUTDIV_MASK;
 557         ref_div = (pll >> QCA956X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
 558                   QCA956X_PLL_CPU_CONFIG_REFDIV_MASK;
 559
 560         pll = ath79_pll_rr(QCA956X_PLL_CPU_CONFIG1_REG);
 561         nint = (pll >> QCA956X_PLL_CPU_CONFIG1_NINT_SHIFT) &
 562                QCA956X_PLL_CPU_CONFIG1_NINT_MASK;
 563         hfrac = (pll >> QCA956X_PLL_CPU_CONFIG1_NFRAC_H_SHIFT) &
 564                QCA956X_PLL_CPU_CONFIG1_NFRAC_H_MASK;
 565         lfrac = (pll >> QCA956X_PLL_CPU_CONFIG1_NFRAC_L_SHIFT) &
 566                QCA956X_PLL_CPU_CONFIG1_NFRAC_L_MASK;
 567
 568         cpu_pll = nint * ref_rate / ref_div;
 569         cpu_pll += (lfrac * ref_rate) / ((ref_div * 25) << 13);
 570         cpu_pll += (hfrac >> 13) * ref_rate / ref_div;
 571         cpu_pll /= (1 << out_div);
 572
 573         pll = ath79_pll_rr(QCA956X_PLL_DDR_CONFIG_REG);
 574         out_div = (pll >> QCA956X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
 575                   QCA956X_PLL_DDR_CONFIG_OUTDIV_MASK;
 576         ref_div = (pll >> QCA956X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
 577                   QCA956X_PLL_DDR_CONFIG_REFDIV_MASK;
 578         pll = ath79_pll_rr(QCA956X_PLL_DDR_CONFIG1_REG);
 579         nint = (pll >> QCA956X_PLL_DDR_CONFIG1_NINT_SHIFT) &
 580                QCA956X_PLL_DDR_CONFIG1_NINT_MASK;
 581         hfrac = (pll >> QCA956X_PLL_DDR_CONFIG1_NFRAC_H_SHIFT) &
 582                QCA956X_PLL_DDR_CONFIG1_NFRAC_H_MASK;
 583         lfrac = (pll >> QCA956X_PLL_DDR_CONFIG1_NFRAC_L_SHIFT) &
 584                QCA956X_PLL_DDR_CONFIG1_NFRAC_L_MASK;
 585
 586         ddr_pll = nint * ref_rate / ref_div;
 587         ddr_pll += (lfrac * ref_rate) / ((ref_div * 25) << 13);
 588         ddr_pll += (hfrac >> 13) * ref_rate / ref_div;
 589         ddr_pll /= (1 << out_div);
 590
 591         clk_ctrl = ath79_pll_rr(QCA956X_PLL_CLK_CTRL_REG);
 592
 593         postdiv = (clk_ctrl >> QCA956X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) &
 594                   QCA956X_PLL_CLK_CTRL_CPU_POST_DIV_MASK;
 595
 596         if (clk_ctrl & QCA956X_PLL_CLK_CTRL_CPU_PLL_BYPASS)
 597                 cpu_rate = ref_rate;
 598         else if (clk_ctrl & QCA956X_PLL_CLK_CTRL_CPU_DDRCLK_FROM_CPUPLL)
 599                 cpu_rate = ddr_pll / (postdiv + 1);
 600         else
 601                 cpu_rate = cpu_pll / (postdiv + 1);
 602
 603         postdiv = (clk_ctrl >> QCA956X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) &
 604                   QCA956X_PLL_CLK_CTRL_DDR_POST_DIV_MASK;
 605
 606         if (clk_ctrl & QCA956X_PLL_CLK_CTRL_DDR_PLL_BYPASS)
 607                 ddr_rate = ref_rate;
 608         else if (clk_ctrl & QCA956X_PLL_CLK_CTRL_CPU_DDRCLK_FROM_DDRPLL)
 609                 ddr_rate = cpu_pll / (postdiv + 1);
 610         else
 611                 ddr_rate = ddr_pll / (postdiv + 1);
 612
 613         postdiv = (clk_ctrl >> QCA956X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) &
 614                   QCA956X_PLL_CLK_CTRL_AHB_POST_DIV_MASK;
 615
 616         if (clk_ctrl & QCA956X_PLL_CLK_CTRL_AHB_PLL_BYPASS)
 617                 ahb_rate = ref_rate;
 618         else if (clk_ctrl & QCA956X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL)
 619                 ahb_rate = ddr_pll / (postdiv + 1);
 620         else
 621                 ahb_rate = cpu_pll / (postdiv + 1);
 622
 623         ath79_add_sys_clkdev("ref", ref_rate);
 624         ath79_add_sys_clkdev("cpu", cpu_rate);
 625         ath79_add_sys_clkdev("ddr", ddr_rate);
 626         ath79_add_sys_clkdev("ahb", ahb_rate);
 627
 628         clk_add_alias("wdt", NULL, "ref", NULL);
 629         clk_add_alias("uart", NULL, "ref", NULL);
 630 }
 631
 632 void __init ath79_clocks_init(void)
 633 {
 634         if (soc_is_ar71xx())
 635                 ar71xx_clocks_init();
 636         else if (soc_is_ar724x() || soc_is_ar913x())
 637                 ar724x_clocks_init();
 638         else if (soc_is_ar933x())
 639                 ar933x_clocks_init();
 640         else if (soc_is_ar934x())
 641                 ar934x_clocks_init();
 642         else if (soc_is_qca953x())
 643                 qca953x_clocks_init();
 644         else if (soc_is_qca955x())
 645                 qca955x_clocks_init();
 646         else if (soc_is_qca956x() || soc_is_tp9343())
 647                 qca956x_clocks_init();
 648         else
 649                 BUG();
 650 }
 651
 652 unsigned long __init
 653 ath79_get_sys_clk_rate(const char *id)
 654 {
 655         struct clk *clk;
 656         unsigned long rate;
 657
 658         clk = clk_get(NULL, id);
 659         if (IS_ERR(clk))
 660                 panic("unable to get %s clock, err=%d", id, (int) PTR_ERR(clk));
 661
 662         rate = clk_get_rate(clk);
 663         clk_put(clk);
 664
 665         return rate;
 666 }
 667
 668 #ifdef CONFIG_OF
 669 static void __init ath79_clocks_init_dt(struct device_node *np)
 670 {
 671         of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
 672 }
 673
 674 CLK_OF_DECLARE(ar7100, "qca,ar7100-pll", ath79_clocks_init_dt);
 675 CLK_OF_DECLARE(ar7240, "qca,ar7240-pll", ath79_clocks_init_dt);
 676 CLK_OF_DECLARE(ar9340, "qca,ar9340-pll", ath79_clocks_init_dt);
 677 CLK_OF_DECLARE(ar9550, "qca,qca9550-pll", ath79_clocks_init_dt);
 678
 679 static void __init ath79_clocks_init_dt_ng(struct device_node *np)
 680 {
 681         struct clk *ref_clk;
 682         void __iomem *pll_base;
 683
 684         ref_clk = of_clk_get(np, 0);
 685         if (IS_ERR(ref_clk)) {
 686                 pr_err("%pOF: of_clk_get failed\n", np);
 687                 goto err;
 688         }
 689
 690         pll_base = of_iomap(np, 0);
 691         if (!pll_base) {
 692                 pr_err("%pOF: can't map pll registers\n", np);
 693                 goto err_clk;
 694         }
 695
 696         if (of_device_is_compatible(np, "qca,ar9130-pll"))
 697                 ar724x_clk_init(ref_clk, pll_base);
 698         else if (of_device_is_compatible(np, "qca,ar9330-pll"))
 699                 ar9330_clk_init(ref_clk, pll_base);
 700         else {
 701                 pr_err("%pOF: could not find any appropriate clk_init()\n", np);
 702                 goto err_iounmap;
 703         }
 704
 705         if (of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data)) {
 706                 pr_err("%pOF: could not register clk provider\n", np);
 707                 goto err_iounmap;
 708         }
 709
 710         return;
 711
 712 err_iounmap:
 713         iounmap(pll_base);
 714
 715 err_clk:
 716         clk_put(ref_clk);
 717
 718 err:
 719         return;
 720 }
 721 CLK_OF_DECLARE(ar9130_clk, "qca,ar9130-pll", ath79_clocks_init_dt_ng);
 722 CLK_OF_DECLARE(ar9330_clk, "qca,ar9330-pll", ath79_clocks_init_dt_ng);
 723 #endif