drivers/clk/renesas/clk-rcar-gen2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Renesas RCar Gen2 CPG MSSR driver
   4  *
   5  * Copyright (C) 2017 Marek Vasut <marek.vasut@gmail.com>
   6  *
   7  * Based on the following driver from Linux kernel:
   8  * r8a7796 Clock Pulse Generator / Module Standby and Software Reset
   9  *
  10  * Copyright (C) 2016 Glider bvba
  11  */
  12
  13 #include <common.h>
  14 #include <clk-uclass.h>
  15 #include <dm.h>
  16 #include <errno.h>
  17 #include <asm/io.h>
  18
  19 #include <dt-bindings/clock/renesas-cpg-mssr.h>
  20
  21 #include "renesas-cpg-mssr.h"
  22 #include "rcar-gen2-cpg.h"
  23
  24 #define CPG_RST_MODEMR          0x0060
  25
  26 #define CPG_PLL0CR              0x00d8
  27 #define CPG_SDCKCR              0x0074
  28
  29 struct clk_div_table {
  30         u8      val;
  31         u8      div;
  32 };
  33
  34 /* SDHI divisors */
  35 static const struct clk_div_table cpg_sdh_div_table[] = {
  36         {  0,  2 }, {  1,  3 }, {  2,  4 }, {  3,  6 },
  37         {  4,  8 }, {  5, 12 }, {  6, 16 }, {  7, 18 },
  38         {  8, 24 }, { 10, 36 }, { 11, 48 }, {  0,  0 },
  39 };
  40
  41 static const struct clk_div_table cpg_sd01_div_table[] = {
  42         {  4,  8 }, {  5, 12 }, {  6, 16 }, {  7, 18 },
  43         {  8, 24 }, { 10, 36 }, { 11, 48 }, { 12, 10 },
  44         {  0,  0 },
  45 };
  46
  47 static u8 gen2_clk_get_sdh_div(const struct clk_div_table *table, u8 div)
  48 {
  49         while ((*table++).val) {
  50                 if ((*table).div == div)
  51                         return div;
  52         }
  53         return 0xff;
  54 }
  55
  56 static int gen2_clk_enable(struct clk *clk)
  57 {
  58         struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
  59
  60         return renesas_clk_endisable(clk, priv->base, true);
  61 }
  62
  63 static int gen2_clk_disable(struct clk *clk)
  64 {
  65         struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
  66
  67         return renesas_clk_endisable(clk, priv->base, false);
  68 }
  69
  70 static ulong gen2_clk_get_rate(struct clk *clk)
  71 {
  72         struct gen2_clk_priv *priv = dev_get_priv(clk->dev);
  73         struct cpg_mssr_info *info = priv->info;
  74         struct clk parent;
  75         const struct cpg_core_clk *core;
  76         const struct rcar_gen2_cpg_pll_config *pll_config =
  77                                         priv->cpg_pll_config;
  78         u32 value, mult, div, rate = 0;
  79         int ret;
  80
  81         debug("%s[%i] Clock: id=%lu\n", __func__, __LINE__, clk->id);
  82
  83         ret = renesas_clk_get_parent(clk, info, &parent);
  84         if (ret) {
  85                 printf("%s[%i] parent fail, ret=%i\n", __func__, __LINE__, ret);
  86                 return ret;
  87         }
  88
  89         if (renesas_clk_is_mod(clk)) {
  90                 rate = gen2_clk_get_rate(&parent);
  91                 debug("%s[%i] MOD clk: parent=%lu => rate=%u\n",
  92                       __func__, __LINE__, parent.id, rate);
  93                 return rate;
  94         }
  95
  96         ret = renesas_clk_get_core(clk, info, &core);
  97         if (ret)
  98                 return ret;
  99
 100         switch (core->type) {
 101         case CLK_TYPE_IN:
 102                 if (core->id == info->clk_extal_id) {
 103                         rate = clk_get_rate(&priv->clk_extal);
 104                         debug("%s[%i] EXTAL clk: rate=%u\n",
 105                               __func__, __LINE__, rate);
 106                         return rate;
 107                 }
 108
 109                 if (core->id == info->clk_extal_usb_id) {
 110                         rate = clk_get_rate(&priv->clk_extal_usb);
 111                         debug("%s[%i] EXTALR clk: rate=%u\n",
 112                               __func__, __LINE__, rate);
 113                         return rate;
 114                 }
 115
 116                 return -EINVAL;
 117
 118         case CLK_TYPE_FF:
 119                 rate = (gen2_clk_get_rate(&parent) * core->mult) / core->div;
 120                 debug("%s[%i] FIXED clk: parent=%i div=%i mul=%i => rate=%u\n",
 121                       __func__, __LINE__,
 122                       core->parent, core->mult, core->div, rate);
 123                 return rate;
 124
 125         case CLK_TYPE_DIV6P1:   /* DIV6 Clock with 1 parent clock */
 126                 value = (readl(priv->base + core->offset) & 0x3f) + 1;
 127                 rate = gen2_clk_get_rate(&parent) / value;
 128                 debug("%s[%i] DIV6P1 clk: parent=%i div=%i => rate=%u\n",
 129                       __func__, __LINE__,
 130                       core->parent, value, rate);
 131                 return rate;
 132
 133         case CLK_TYPE_GEN2_MAIN:
 134                 rate = gen2_clk_get_rate(&parent) / pll_config->extal_div;
 135                 debug("%s[%i] MAIN clk: parent=%i extal_div=%i => rate=%u\n",
 136                       __func__, __LINE__,
 137                       core->parent, pll_config->extal_div, rate);
 138                 return rate;
 139
 140         case CLK_TYPE_GEN2_PLL0:
 141                 /*
 142                  * PLL0 is a  configurable multiplier clock except on R-Car
 143                  * V2H/E2. Register the PLL0 clock as a fixed factor clock for
 144                  * now as there's no generic multiplier clock implementation and
 145                  * we  currently  have no need to change  the multiplier value.
 146                  */
 147                 mult = pll_config->pll0_mult;
 148                 if (!mult) {
 149                         value = readl(priv->base + CPG_PLL0CR);
 150                         mult = (((value >> 24) & 0x7f) + 1) * 2;
 151                 }
 152
 153                 rate = (gen2_clk_get_rate(&parent) * mult) / info->pll0_div;
 154                 debug("%s[%i] PLL0 clk: parent=%i mult=%u => rate=%u\n",
 155                       __func__, __LINE__, core->parent, mult, rate);
 156                 return rate;
 157
 158         case CLK_TYPE_GEN2_PLL1:
 159                 rate = (gen2_clk_get_rate(&parent) * pll_config->pll1_mult) / 2;
 160                 debug("%s[%i] PLL1 clk: parent=%i mul=%i => rate=%u\n",
 161                       __func__, __LINE__,
 162                       core->parent, pll_config->pll1_mult, rate);
 163                 return rate;
 164
 165         case CLK_TYPE_GEN2_PLL3:
 166                 rate = gen2_clk_get_rate(&parent) * pll_config->pll3_mult;
 167                 debug("%s[%i] PLL3 clk: parent=%i mul=%i => rate=%u\n",
 168                       __func__, __LINE__,
 169                       core->parent, pll_config->pll3_mult, rate);
 170                 return rate;
 171
 172         case CLK_TYPE_GEN2_SDH:
 173                 value = (readl(priv->base + CPG_SDCKCR) >> 8) & 0xf;
 174                 div = gen2_clk_get_sdh_div(cpg_sdh_div_table, value);
 175                 rate = gen2_clk_get_rate(&parent) / div;
 176                 debug("%s[%i] SDH clk: parent=%i div=%i => rate=%u\n",
 177                       __func__, __LINE__,
 178                       core->parent, div, rate);
 179                 return rate;
 180
 181         case CLK_TYPE_GEN2_SD0:
 182                 value = (readl(priv->base + CPG_SDCKCR) >> 4) & 0xf;
 183                 div = gen2_clk_get_sdh_div(cpg_sd01_div_table, value);
 184                 rate = gen2_clk_get_rate(&parent) / div;
 185                 debug("%s[%i] SD0 clk: parent=%i div=%i => rate=%u\n",
 186                       __func__, __LINE__,
 187                       core->parent, div, rate);
 188                 return rate;
 189
 190         case CLK_TYPE_GEN2_SD1:
 191                 value = (readl(priv->base + CPG_SDCKCR) >> 0) & 0xf;
 192                 div = gen2_clk_get_sdh_div(cpg_sd01_div_table, value);
 193                 rate = gen2_clk_get_rate(&parent) / div;
 194                 debug("%s[%i] SD1 clk: parent=%i div=%i => rate=%u\n",
 195                       __func__, __LINE__,
 196                       core->parent, div, rate);
 197                 return rate;
 198         }
 199
 200         printf("%s[%i] unknown fail\n", __func__, __LINE__);
 201
 202         return -ENOENT;
 203 }
 204
 205 static ulong gen2_clk_set_rate(struct clk *clk, ulong rate)
 206 {
 207         return gen2_clk_get_rate(clk);
 208 }
 209
 210 static int gen2_clk_of_xlate(struct clk *clk, struct ofnode_phandle_args *args)
 211 {
 212         if (args->args_count != 2) {
 213                 debug("Invaild args_count: %d\n", args->args_count);
 214                 return -EINVAL;
 215         }
 216
 217         clk->id = (args->args[0] << 16) | args->args[1];
 218
 219         return 0;
 220 }
 221
 222 const struct clk_ops gen2_clk_ops = {
 223         .enable         = gen2_clk_enable,
 224         .disable        = gen2_clk_disable,
 225         .get_rate       = gen2_clk_get_rate,
 226         .set_rate       = gen2_clk_set_rate,
 227         .of_xlate       = gen2_clk_of_xlate,
 228 };
 229
 230 int gen2_clk_probe(struct udevice *dev)
 231 {
 232         struct gen2_clk_priv *priv = dev_get_priv(dev);
 233         struct cpg_mssr_info *info =
 234                 (struct cpg_mssr_info *)dev_get_driver_data(dev);
 235         fdt_addr_t rst_base;
 236         u32 cpg_mode;
 237         int ret;
 238
 239         priv->base = (struct gen2_base *)devfdt_get_addr(dev);
 240         if (!priv->base)
 241                 return -EINVAL;
 242
 243         priv->info = info;
 244         ret = fdt_node_offset_by_compatible(gd->fdt_blob, -1, info->reset_node);
 245         if (ret < 0)
 246                 return ret;
 247
 248         rst_base = fdtdec_get_addr(gd->fdt_blob, ret, "reg");
 249         if (rst_base == FDT_ADDR_T_NONE)
 250                 return -EINVAL;
 251
 252         cpg_mode = readl(rst_base + CPG_RST_MODEMR);
 253
 254         priv->cpg_pll_config =
 255                 (struct rcar_gen2_cpg_pll_config *)info->get_pll_config(cpg_mode);
 256         if (!priv->cpg_pll_config->extal_div)
 257                 return -EINVAL;
 258
 259         ret = clk_get_by_name(dev, "extal", &priv->clk_extal);
 260         if (ret < 0)
 261                 return ret;
 262
 263         if (info->extal_usb_node) {
 264                 ret = clk_get_by_name(dev, info->extal_usb_node,
 265                                       &priv->clk_extal_usb);
 266                 if (ret < 0)
 267                         return ret;
 268         }
 269
 270         return 0;
 271 }
 272
 273 int gen2_clk_remove(struct udevice *dev)
 274 {
 275         struct gen2_clk_priv *priv = dev_get_priv(dev);
 276
 277         return renesas_clk_remove(priv->base, priv->info);
 278 }