drivers/clk/rockchip/clk_rk3036.c

   1 /*
   2  * (C) Copyright 2015 Google, Inc
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <clk-uclass.h>
   9 #include <dm.h>
  10 #include <errno.h>
  11 #include <syscon.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/clock.h>
  14 #include <asm/arch/cru_rk3036.h>
  15 #include <asm/arch/hardware.h>
  16 #include <dm/lists.h>
  17 #include <dt-bindings/clock/rk3036-cru.h>
  18 #include <linux/log2.h>
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 enum {
  23         VCO_MAX_HZ      = 2400U * 1000000,
  24         VCO_MIN_HZ      = 600 * 1000000,
  25         OUTPUT_MAX_HZ   = 2400U * 1000000,
  26         OUTPUT_MIN_HZ   = 24 * 1000000,
  27 };
  28
  29 #define RATE_TO_DIV(input_rate, output_rate) \
  30         ((input_rate) / (output_rate) - 1);
  31
  32 #define DIV_TO_RATE(input_rate, div)    ((input_rate) / ((div) + 1))
  33
  34 #define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
  35         .refdiv = _refdiv,\
  36         .fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
  37         .postdiv1 = _postdiv1, .postdiv2 = _postdiv2};\
  38         _Static_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) *\
  39                          OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz,\
  40                          #hz "Hz cannot be hit with PLL "\
  41                          "divisors on line " __stringify(__LINE__));
  42
  43 /* use integer mode*/
  44 static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
  45 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);
  46
  47 static int rkclk_set_pll(struct rk3036_cru *cru, enum rk_clk_id clk_id,
  48                          const struct pll_div *div)
  49 {
  50         int pll_id = rk_pll_id(clk_id);
  51         struct rk3036_pll *pll = &cru->pll[pll_id];
  52
  53         /* All PLLs have same VCO and output frequency range restrictions. */
  54         uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
  55         uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;
  56
  57         debug("PLL at %p: fbdiv=%d, refdiv=%d, postdiv1=%d, postdiv2=%d,\
  58                  vco=%u Hz, output=%u Hz\n",
  59                         pll, div->fbdiv, div->refdiv, div->postdiv1,
  60                         div->postdiv2, vco_hz, output_hz);
  61         assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
  62                output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);
  63
  64         /* use integer mode */
  65         rk_setreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
  66
  67         rk_clrsetreg(&pll->con0,
  68                      PLL_POSTDIV1_MASK | PLL_FBDIV_MASK,
  69                      (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
  70         rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
  71                      (div->postdiv2 << PLL_POSTDIV2_SHIFT |
  72                      div->refdiv << PLL_REFDIV_SHIFT));
  73
  74         /* waiting for pll lock */
  75         while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
  76                 udelay(1);
  77
  78         return 0;
  79 }
  80
  81 static void rkclk_init(struct rk3036_cru *cru)
  82 {
  83         u32 aclk_div;
  84         u32 hclk_div;
  85         u32 pclk_div;
  86
  87         /* pll enter slow-mode */
  88         rk_clrsetreg(&cru->cru_mode_con,
  89                      GPLL_MODE_MASK | APLL_MODE_MASK,
  90                      GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
  91                      APLL_MODE_SLOW << APLL_MODE_SHIFT);
  92
  93         /* init pll */
  94         rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
  95         rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
  96
  97         /*
  98          * select apll as cpu/core clock pll source and
  99          * set up dependent divisors for PERI and ACLK clocks.
 100          * core hz : apll = 1:1
 101          */
 102         aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
 103         assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
 104
 105         pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
 106         assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
 107
 108         rk_clrsetreg(&cru->cru_clksel_con[0],
 109                      CORE_CLK_PLL_SEL_MASK | CORE_DIV_CON_MASK,
 110                      CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
 111                      0 << CORE_DIV_CON_SHIFT);
 112
 113         rk_clrsetreg(&cru->cru_clksel_con[1],
 114                      CORE_ACLK_DIV_MASK | CORE_PERI_DIV_MASK,
 115                      aclk_div << CORE_ACLK_DIV_SHIFT |
 116                      pclk_div << CORE_PERI_DIV_SHIFT);
 117
 118         /*
 119          * select apll as pd_bus bus clock source and
 120          * set up dependent divisors for PCLK/HCLK and ACLK clocks.
 121          */
 122         aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
 123         assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);
 124
 125         pclk_div = GPLL_HZ / BUS_PCLK_HZ - 1;
 126         assert((pclk_div + 1) * BUS_PCLK_HZ == GPLL_HZ && pclk_div <= 0x7);
 127
 128         hclk_div = GPLL_HZ / BUS_HCLK_HZ - 1;
 129         assert((hclk_div + 1) * BUS_HCLK_HZ == GPLL_HZ && hclk_div <= 0x3);
 130
 131         rk_clrsetreg(&cru->cru_clksel_con[0],
 132                      BUS_ACLK_PLL_SEL_MASK | BUS_ACLK_DIV_MASK,
 133                      BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT |
 134                      aclk_div << BUS_ACLK_DIV_SHIFT);
 135
 136         rk_clrsetreg(&cru->cru_clksel_con[1],
 137                      BUS_PCLK_DIV_MASK | BUS_HCLK_DIV_MASK,
 138                      pclk_div << BUS_PCLK_DIV_SHIFT |
 139                      hclk_div << BUS_HCLK_DIV_SHIFT);
 140
 141         /*
 142          * select gpll as pd_peri bus clock source and
 143          * set up dependent divisors for PCLK/HCLK and ACLK clocks.
 144          */
 145         aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
 146         assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
 147
 148         hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
 149         assert((1 << hclk_div) * PERI_HCLK_HZ ==
 150                 PERI_ACLK_HZ && (hclk_div < 0x4));
 151
 152         pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
 153         assert((1 << pclk_div) * PERI_PCLK_HZ ==
 154                 PERI_ACLK_HZ && pclk_div < 0x8);
 155
 156         rk_clrsetreg(&cru->cru_clksel_con[10],
 157                      PERI_PLL_SEL_MASK | PERI_PCLK_DIV_MASK |
 158                      PERI_HCLK_DIV_MASK | PERI_ACLK_DIV_MASK,
 159                      PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
 160                      pclk_div << PERI_PCLK_DIV_SHIFT |
 161                      hclk_div << PERI_HCLK_DIV_SHIFT |
 162                      aclk_div << PERI_ACLK_DIV_SHIFT);
 163
 164         /* PLL enter normal-mode */
 165         rk_clrsetreg(&cru->cru_mode_con,
 166                      GPLL_MODE_MASK | APLL_MODE_MASK,
 167                      GPLL_MODE_NORM << GPLL_MODE_SHIFT |
 168                      APLL_MODE_NORM << APLL_MODE_SHIFT);
 169 }
 170
 171 /* Get pll rate by id */
 172 static uint32_t rkclk_pll_get_rate(struct rk3036_cru *cru,
 173                                    enum rk_clk_id clk_id)
 174 {
 175         uint32_t refdiv, fbdiv, postdiv1, postdiv2;
 176         uint32_t con;
 177         int pll_id = rk_pll_id(clk_id);
 178         struct rk3036_pll *pll = &cru->pll[pll_id];
 179         static u8 clk_shift[CLK_COUNT] = {
 180                 0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
 181                 GPLL_MODE_SHIFT, 0xff
 182         };
 183         static u32 clk_mask[CLK_COUNT] = {
 184                 0xffffffff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xffffffff,
 185                 GPLL_MODE_MASK, 0xffffffff
 186         };
 187         uint shift;
 188         uint mask;
 189
 190         con = readl(&cru->cru_mode_con);
 191         shift = clk_shift[clk_id];
 192         mask = clk_mask[clk_id];
 193
 194         switch ((con & mask) >> shift) {
 195         case GPLL_MODE_SLOW:
 196                 return OSC_HZ;
 197         case GPLL_MODE_NORM:
 198
 199                 /* normal mode */
 200                 con = readl(&pll->con0);
 201                 postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
 202                 fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
 203                 con = readl(&pll->con1);
 204                 postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
 205                 refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
 206                 return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
 207         case GPLL_MODE_DEEP:
 208         default:
 209                 return 32768;
 210         }
 211 }
 212
 213 static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
 214                                   int periph)
 215 {
 216         uint src_rate;
 217         uint div, mux;
 218         u32 con;
 219
 220         switch (periph) {
 221         case HCLK_EMMC:
 222         case SCLK_EMMC:
 223                 con = readl(&cru->cru_clksel_con[12]);
 224                 mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
 225                 div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
 226                 break;
 227         case HCLK_SDIO:
 228         case SCLK_SDIO:
 229                 con = readl(&cru->cru_clksel_con[12]);
 230                 mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
 231                 div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
 232                 break;
 233         default:
 234                 return -EINVAL;
 235         }
 236
 237         src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
 238         return DIV_TO_RATE(src_rate, div) / 2;
 239 }
 240
 241 static ulong rockchip_mmc_set_clk(struct rk3036_cru *cru, uint clk_general_rate,
 242                                   int periph, uint freq)
 243 {
 244         int src_clk_div;
 245         int mux;
 246
 247         debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
 248
 249         /* mmc clock auto divide 2 in internal */
 250         src_clk_div = DIV_ROUND_UP(clk_general_rate / 2, freq);
 251
 252         if (src_clk_div > 128) {
 253                 src_clk_div = DIV_ROUND_UP(OSC_HZ / 2, freq);
 254                 assert(src_clk_div - 1 < 128);
 255                 mux = EMMC_SEL_24M;
 256         } else {
 257                 mux = EMMC_SEL_GPLL;
 258         }
 259
 260         switch (periph) {
 261         case HCLK_EMMC:
 262         case SCLK_EMMC:
 263                 rk_clrsetreg(&cru->cru_clksel_con[12],
 264                              EMMC_PLL_MASK | EMMC_DIV_MASK,
 265                              mux << EMMC_PLL_SHIFT |
 266                              (src_clk_div - 1) << EMMC_DIV_SHIFT);
 267                 break;
 268         case HCLK_SDIO:
 269         case SCLK_SDIO:
 270                 rk_clrsetreg(&cru->cru_clksel_con[11],
 271                              MMC0_PLL_MASK | MMC0_DIV_MASK,
 272                              mux << MMC0_PLL_SHIFT |
 273                              (src_clk_div - 1) << MMC0_DIV_SHIFT);
 274                 break;
 275         default:
 276                 return -EINVAL;
 277         }
 278
 279         return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
 280 }
 281
 282 static ulong rk3036_clk_get_rate(struct clk *clk)
 283 {
 284         struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
 285
 286         switch (clk->id) {
 287         case 0 ... 63:
 288                 return rkclk_pll_get_rate(priv->cru, clk->id);
 289         default:
 290                 return -ENOENT;
 291         }
 292 }
 293
 294 static ulong rk3036_clk_set_rate(struct clk *clk, ulong rate)
 295 {
 296         struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
 297         ulong new_rate, gclk_rate;
 298
 299         gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
 300         switch (clk->id) {
 301         case 0 ... 63:
 302                 return 0;
 303         case HCLK_EMMC:
 304         case SCLK_EMMC:
 305                 new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
 306                                                 clk->id, rate);
 307                 break;
 308         default:
 309                 return -ENOENT;
 310         }
 311
 312         return new_rate;
 313 }
 314
 315 static struct clk_ops rk3036_clk_ops = {
 316         .get_rate       = rk3036_clk_get_rate,
 317         .set_rate       = rk3036_clk_set_rate,
 318 };
 319
 320 static int rk3036_clk_probe(struct udevice *dev)
 321 {
 322         struct rk3036_clk_priv *priv = dev_get_priv(dev);
 323
 324         priv->cru = (struct rk3036_cru *)devfdt_get_addr(dev);
 325         rkclk_init(priv->cru);
 326
 327         return 0;
 328 }
 329
 330 static int rk3036_clk_bind(struct udevice *dev)
 331 {
 332         int ret;
 333
 334         /* The reset driver does not have a device node, so bind it here */
 335         ret = device_bind_driver(gd->dm_root, "rk3036_sysreset", "reset", &dev);
 336         if (ret)
 337                 debug("Warning: No RK3036 reset driver: ret=%d\n", ret);
 338
 339         return 0;
 340 }
 341
 342 static const struct udevice_id rk3036_clk_ids[] = {
 343         { .compatible = "rockchip,rk3036-cru" },
 344         { }
 345 };
 346
 347 U_BOOT_DRIVER(rockchip_rk3036_cru) = {
 348         .name           = "clk_rk3036",
 349         .id             = UCLASS_CLK,
 350         .of_match       = rk3036_clk_ids,
 351         .priv_auto_alloc_size = sizeof(struct rk3036_clk_priv),
 352         .ops            = &rk3036_clk_ops,
 353         .bind           = rk3036_clk_bind,
 354         .probe          = rk3036_clk_probe,
 355 };