drivers/clk/tegra/clk-tegra-super-gen4.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2012, 2013, NVIDIA CORPORATION.  All rights reserved.
   4  */
   5
   6 #include <linux/io.h>
   7 #include <linux/clk-provider.h>
   8 #include <linux/of.h>
   9 #include <linux/of_address.h>
  10 #include <linux/delay.h>
  11 #include <linux/export.h>
  12 #include <linux/clk/tegra.h>
  13
  14 #include "clk.h"
  15 #include "clk-id.h"
  16
  17 #define PLLX_BASE 0xe0
  18 #define PLLX_MISC 0xe4
  19 #define PLLX_MISC2 0x514
  20 #define PLLX_MISC3 0x518
  21
  22 #define CCLKG_BURST_POLICY 0x368
  23 #define CCLKLP_BURST_POLICY 0x370
  24 #define SCLK_BURST_POLICY 0x028
  25 #define SYSTEM_CLK_RATE 0x030
  26 #define SCLK_DIVIDER 0x2c
  27
  28 static DEFINE_SPINLOCK(sysrate_lock);
  29
  30 enum tegra_super_gen {
  31         gen4 = 4,
  32         gen5,
  33 };
  34
  35 struct tegra_super_gen_info {
  36         enum tegra_super_gen gen;
  37         const char **sclk_parents;
  38         const char **cclk_g_parents;
  39         const char **cclk_lp_parents;
  40         int num_sclk_parents;
  41         int num_cclk_g_parents;
  42         int num_cclk_lp_parents;
  43 };
  44
  45 static const char *sclk_parents[] = { "clk_m", "pll_c_out1", "pll_p_out4",
  46                                "pll_p", "pll_p_out2", "unused",
  47                                "clk_32k", "pll_m_out1" };
  48
  49 static const char *cclk_g_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
  50                                         "pll_p", "pll_p_out4", "unused",
  51                                         "unused", "pll_x", "unused", "unused",
  52                                         "unused", "unused", "unused", "unused",
  53                                         "dfllCPU_out" };
  54
  55 static const char *cclk_lp_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
  56                                          "pll_p", "pll_p_out4", "unused",
  57                                          "unused", "pll_x", "pll_x_out0" };
  58
  59 static const struct tegra_super_gen_info tegra_super_gen_info_gen4 = {
  60         .gen = gen4,
  61         .sclk_parents = sclk_parents,
  62         .cclk_g_parents = cclk_g_parents,
  63         .cclk_lp_parents = cclk_lp_parents,
  64         .num_sclk_parents = ARRAY_SIZE(sclk_parents),
  65         .num_cclk_g_parents = ARRAY_SIZE(cclk_g_parents),
  66         .num_cclk_lp_parents = ARRAY_SIZE(cclk_lp_parents),
  67 };
  68
  69 static const char *sclk_parents_gen5[] = { "clk_m", "pll_c_out1", "pll_c4_out3",
  70                                "pll_p", "pll_p_out2", "pll_c4_out1",
  71                                "clk_32k", "pll_c4_out2" };
  72
  73 static const char *cclk_g_parents_gen5[] = { "clk_m", "unused", "clk_32k", "unused",
  74                                         "pll_p", "pll_p_out4", "unused",
  75                                         "unused", "pll_x", "unused", "unused",
  76                                         "unused", "unused", "unused", "unused",
  77                                         "dfllCPU_out" };
  78
  79 static const char *cclk_lp_parents_gen5[] = { "clk_m", "unused", "clk_32k", "unused",
  80                                         "pll_p", "pll_p_out4", "unused",
  81                                         "unused", "pll_x", "unused", "unused",
  82                                         "unused", "unused", "unused", "unused",
  83                                         "dfllCPU_out" };
  84
  85 static const struct tegra_super_gen_info tegra_super_gen_info_gen5 = {
  86         .gen = gen5,
  87         .sclk_parents = sclk_parents_gen5,
  88         .cclk_g_parents = cclk_g_parents_gen5,
  89         .cclk_lp_parents = cclk_lp_parents_gen5,
  90         .num_sclk_parents = ARRAY_SIZE(sclk_parents_gen5),
  91         .num_cclk_g_parents = ARRAY_SIZE(cclk_g_parents_gen5),
  92         .num_cclk_lp_parents = ARRAY_SIZE(cclk_lp_parents_gen5),
  93 };
  94
  95 static void __init tegra_sclk_init(void __iomem *clk_base,
  96                                 struct tegra_clk *tegra_clks,
  97                                 const struct tegra_super_gen_info *gen_info)
  98 {
  99         struct clk *clk;
 100         struct clk **dt_clk;
 101
 102         /* SCLK_MUX */
 103         dt_clk = tegra_lookup_dt_id(tegra_clk_sclk_mux, tegra_clks);
 104         if (dt_clk) {
 105                 clk = tegra_clk_register_super_mux("sclk_mux",
 106                                                 gen_info->sclk_parents,
 107                                                 gen_info->num_sclk_parents,
 108                                                 CLK_SET_RATE_PARENT,
 109                                                 clk_base + SCLK_BURST_POLICY,
 110                                                 0, 4, 0, 0, NULL);
 111                 *dt_clk = clk;
 112
 113
 114                 /* SCLK */
 115                 dt_clk = tegra_lookup_dt_id(tegra_clk_sclk, tegra_clks);
 116                 if (dt_clk) {
 117                         clk = clk_register_divider(NULL, "sclk", "sclk_mux",
 118                                                 CLK_IS_CRITICAL,
 119                                                 clk_base + SCLK_DIVIDER, 0, 8,
 120                                                 0, &sysrate_lock);
 121                         *dt_clk = clk;
 122                 }
 123         } else {
 124                 /* SCLK */
 125                 dt_clk = tegra_lookup_dt_id(tegra_clk_sclk, tegra_clks);
 126                 if (dt_clk) {
 127                         clk = tegra_clk_register_super_mux("sclk",
 128                                                 gen_info->sclk_parents,
 129                                                 gen_info->num_sclk_parents,
 130                                                 CLK_SET_RATE_PARENT |
 131                                                 CLK_IS_CRITICAL,
 132                                                 clk_base + SCLK_BURST_POLICY,
 133                                                 0, 4, 0, 0, NULL);
 134                         *dt_clk = clk;
 135                 }
 136         }
 137
 138         /* HCLK */
 139         dt_clk = tegra_lookup_dt_id(tegra_clk_hclk, tegra_clks);
 140         if (dt_clk) {
 141                 clk = clk_register_divider(NULL, "hclk_div", "sclk", 0,
 142                                    clk_base + SYSTEM_CLK_RATE, 4, 2, 0,
 143                                    &sysrate_lock);
 144                 clk = clk_register_gate(NULL, "hclk", "hclk_div",
 145                                 CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
 146                                 clk_base + SYSTEM_CLK_RATE,
 147                                 7, CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
 148                 *dt_clk = clk;
 149         }
 150
 151         /* PCLK */
 152         dt_clk = tegra_lookup_dt_id(tegra_clk_pclk, tegra_clks);
 153         if (!dt_clk)
 154                 return;
 155
 156         clk = clk_register_divider(NULL, "pclk_div", "hclk", 0,
 157                                    clk_base + SYSTEM_CLK_RATE, 0, 2, 0,
 158                                    &sysrate_lock);
 159         clk = clk_register_gate(NULL, "pclk", "pclk_div", CLK_SET_RATE_PARENT |
 160                                 CLK_IS_CRITICAL, clk_base + SYSTEM_CLK_RATE,
 161                                 3, CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
 162         *dt_clk = clk;
 163 }
 164
 165 static void __init tegra_super_clk_init(void __iomem *clk_base,
 166                                 void __iomem *pmc_base,
 167                                 struct tegra_clk *tegra_clks,
 168                                 struct tegra_clk_pll_params *params,
 169                                 const struct tegra_super_gen_info *gen_info)
 170 {
 171         struct clk *clk;
 172         struct clk **dt_clk;
 173
 174         /* CCLKG */
 175         dt_clk = tegra_lookup_dt_id(tegra_clk_cclk_g, tegra_clks);
 176         if (dt_clk) {
 177                 if (gen_info->gen == gen5) {
 178                         clk = tegra_clk_register_super_mux("cclk_g",
 179                                         gen_info->cclk_g_parents,
 180                                         gen_info->num_cclk_g_parents,
 181                                         CLK_SET_RATE_PARENT,
 182                                         clk_base + CCLKG_BURST_POLICY,
 183                                         TEGRA210_CPU_CLK, 4, 8, 0, NULL);
 184                 } else {
 185                         clk = tegra_clk_register_super_mux("cclk_g",
 186                                         gen_info->cclk_g_parents,
 187                                         gen_info->num_cclk_g_parents,
 188                                         CLK_SET_RATE_PARENT,
 189                                         clk_base + CCLKG_BURST_POLICY,
 190                                         0, 4, 0, 0, NULL);
 191                 }
 192                 *dt_clk = clk;
 193         }
 194
 195         /* CCLKLP */
 196         dt_clk = tegra_lookup_dt_id(tegra_clk_cclk_lp, tegra_clks);
 197         if (dt_clk) {
 198                 if (gen_info->gen == gen5) {
 199                         /*
 200                          * TEGRA210_CPU_CLK flag is not needed for cclk_lp as
 201                          * cluster switching is not currently supported on
 202                          * Tegra210 and also cpu_lp is not used.
 203                          */
 204                         clk = tegra_clk_register_super_mux("cclk_lp",
 205                                         gen_info->cclk_lp_parents,
 206                                         gen_info->num_cclk_lp_parents,
 207                                         CLK_SET_RATE_PARENT,
 208                                         clk_base + CCLKLP_BURST_POLICY,
 209                                         0, 4, 8, 0, NULL);
 210                 } else {
 211                         clk = tegra_clk_register_super_mux("cclk_lp",
 212                                         gen_info->cclk_lp_parents,
 213                                         gen_info->num_cclk_lp_parents,
 214                                         CLK_SET_RATE_PARENT,
 215                                         clk_base + CCLKLP_BURST_POLICY,
 216                                         TEGRA_DIVIDER_2, 4, 8, 9, NULL);
 217                 }
 218                 *dt_clk = clk;
 219         }
 220
 221         tegra_sclk_init(clk_base, tegra_clks, gen_info);
 222
 223 #if defined(CONFIG_ARCH_TEGRA_114_SOC) || \
 224     defined(CONFIG_ARCH_TEGRA_124_SOC) || \
 225     defined(CONFIG_ARCH_TEGRA_210_SOC)
 226         /* PLLX */
 227         dt_clk = tegra_lookup_dt_id(tegra_clk_pll_x, tegra_clks);
 228         if (!dt_clk)
 229                 return;
 230
 231 #if defined(CONFIG_ARCH_TEGRA_210_SOC)
 232         if (gen_info->gen == gen5)
 233                 clk = tegra_clk_register_pllc_tegra210("pll_x", "pll_ref",
 234                         clk_base, pmc_base, CLK_IGNORE_UNUSED, params, NULL);
 235         else
 236 #endif
 237                 clk = tegra_clk_register_pllxc("pll_x", "pll_ref", clk_base,
 238                                 pmc_base, CLK_IGNORE_UNUSED, params, NULL);
 239
 240         *dt_clk = clk;
 241
 242         /* PLLX_OUT0 */
 243
 244         dt_clk = tegra_lookup_dt_id(tegra_clk_pll_x_out0, tegra_clks);
 245         if (!dt_clk)
 246                 return;
 247         clk = clk_register_fixed_factor(NULL, "pll_x_out0", "pll_x",
 248                                         CLK_SET_RATE_PARENT, 1, 2);
 249         *dt_clk = clk;
 250 #endif
 251 }
 252
 253 void __init tegra_super_clk_gen4_init(void __iomem *clk_base,
 254                                 void __iomem *pmc_base,
 255                                 struct tegra_clk *tegra_clks,
 256                                 struct tegra_clk_pll_params *params)
 257 {
 258         tegra_super_clk_init(clk_base, pmc_base, tegra_clks, params,
 259                              &tegra_super_gen_info_gen4);
 260 }
 261
 262 void __init tegra_super_clk_gen5_init(void __iomem *clk_base,
 263                                 void __iomem *pmc_base,
 264                                 struct tegra_clk *tegra_clks,
 265                                 struct tegra_clk_pll_params *params)
 266 {
 267         tegra_super_clk_init(clk_base, pmc_base, tegra_clks, params,
 268                              &tegra_super_gen_info_gen5);
 269 }