drivers/clk/mediatek/clk-mtk.c

   1 /*
   2  * Copyright (c) 2014 MediaTek Inc.
   3  * Author: James Liao <jamesjj.liao@mediatek.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/of.h>
  16 #include <linux/of_address.h>
  17 #include <linux/err.h>
  18 #include <linux/io.h>
  19 #include <linux/slab.h>
  20 #include <linux/delay.h>
  21 #include <linux/clkdev.h>
  22 #include <linux/mfd/syscon.h>
  23
  24 #include "clk-mtk.h"
  25 #include "clk-gate.h"
  26
  27 struct clk_onecell_data *mtk_alloc_clk_data(unsigned int clk_num)
  28 {
  29         int i;
  30         struct clk_onecell_data *clk_data;
  31
  32         clk_data = kzalloc(sizeof(*clk_data), GFP_KERNEL);
  33         if (!clk_data)
  34                 return NULL;
  35
  36         clk_data->clks = kcalloc(clk_num, sizeof(*clk_data->clks), GFP_KERNEL);
  37         if (!clk_data->clks)
  38                 goto err_out;
  39
  40         clk_data->clk_num = clk_num;
  41
  42         for (i = 0; i < clk_num; i++)
  43                 clk_data->clks[i] = ERR_PTR(-ENOENT);
  44
  45         return clk_data;
  46 err_out:
  47         kfree(clk_data);
  48
  49         return NULL;
  50 }
  51
  52 void mtk_clk_register_fixed_clks(const struct mtk_fixed_clk *clks,
  53                 int num, struct clk_onecell_data *clk_data)
  54 {
  55         int i;
  56         struct clk *clk;
  57
  58         for (i = 0; i < num; i++) {
  59                 const struct mtk_fixed_clk *rc = &clks[i];
  60
  61                 if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[rc->id]))
  62                         continue;
  63
  64                 clk = clk_register_fixed_rate(NULL, rc->name, rc->parent, 0,
  65                                               rc->rate);
  66
  67                 if (IS_ERR(clk)) {
  68                         pr_err("Failed to register clk %s: %ld\n",
  69                                         rc->name, PTR_ERR(clk));
  70                         continue;
  71                 }
  72
  73                 if (clk_data)
  74                         clk_data->clks[rc->id] = clk;
  75         }
  76 }
  77
  78 void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
  79                 int num, struct clk_onecell_data *clk_data)
  80 {
  81         int i;
  82         struct clk *clk;
  83
  84         for (i = 0; i < num; i++) {
  85                 const struct mtk_fixed_factor *ff = &clks[i];
  86
  87                 if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[ff->id]))
  88                         continue;
  89
  90                 clk = clk_register_fixed_factor(NULL, ff->name, ff->parent_name,
  91                                 CLK_SET_RATE_PARENT, ff->mult, ff->div);
  92
  93                 if (IS_ERR(clk)) {
  94                         pr_err("Failed to register clk %s: %ld\n",
  95                                         ff->name, PTR_ERR(clk));
  96                         continue;
  97                 }
  98
  99                 if (clk_data)
 100                         clk_data->clks[ff->id] = clk;
 101         }
 102 }
 103
 104 int mtk_clk_register_gates(struct device_node *node,
 105                 const struct mtk_gate *clks,
 106                 int num, struct clk_onecell_data *clk_data)
 107 {
 108         int i;
 109         struct clk *clk;
 110         struct regmap *regmap;
 111
 112         if (!clk_data)
 113                 return -ENOMEM;
 114
 115         regmap = syscon_node_to_regmap(node);
 116         if (IS_ERR(regmap)) {
 117                 pr_err("Cannot find regmap for %pOF: %ld\n", node,
 118                                 PTR_ERR(regmap));
 119                 return PTR_ERR(regmap);
 120         }
 121
 122         for (i = 0; i < num; i++) {
 123                 const struct mtk_gate *gate = &clks[i];
 124
 125                 if (!IS_ERR_OR_NULL(clk_data->clks[gate->id]))
 126                         continue;
 127
 128                 clk = mtk_clk_register_gate(gate->name, gate->parent_name,
 129                                 regmap,
 130                                 gate->regs->set_ofs,
 131                                 gate->regs->clr_ofs,
 132                                 gate->regs->sta_ofs,
 133                                 gate->shift, gate->ops);
 134
 135                 if (IS_ERR(clk)) {
 136                         pr_err("Failed to register clk %s: %ld\n",
 137                                         gate->name, PTR_ERR(clk));
 138                         continue;
 139                 }
 140
 141                 clk_data->clks[gate->id] = clk;
 142         }
 143
 144         return 0;
 145 }
 146
 147 struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
 148                 void __iomem *base, spinlock_t *lock)
 149 {
 150         struct clk *clk;
 151         struct clk_mux *mux = NULL;
 152         struct clk_gate *gate = NULL;
 153         struct clk_divider *div = NULL;
 154         struct clk_hw *mux_hw = NULL, *gate_hw = NULL, *div_hw = NULL;
 155         const struct clk_ops *mux_ops = NULL, *gate_ops = NULL, *div_ops = NULL;
 156         const char * const *parent_names;
 157         const char *parent;
 158         int num_parents;
 159         int ret;
 160
 161         if (mc->mux_shift >= 0) {
 162                 mux = kzalloc(sizeof(*mux), GFP_KERNEL);
 163                 if (!mux)
 164                         return ERR_PTR(-ENOMEM);
 165
 166                 mux->reg = base + mc->mux_reg;
 167                 mux->mask = BIT(mc->mux_width) - 1;
 168                 mux->shift = mc->mux_shift;
 169                 mux->lock = lock;
 170
 171                 mux_hw = &mux->hw;
 172                 mux_ops = &clk_mux_ops;
 173
 174                 parent_names = mc->parent_names;
 175                 num_parents = mc->num_parents;
 176         } else {
 177                 parent = mc->parent;
 178                 parent_names = &parent;
 179                 num_parents = 1;
 180         }
 181
 182         if (mc->gate_shift >= 0) {
 183                 gate = kzalloc(sizeof(*gate), GFP_KERNEL);
 184                 if (!gate) {
 185                         ret = -ENOMEM;
 186                         goto err_out;
 187                 }
 188
 189                 gate->reg = base + mc->gate_reg;
 190                 gate->bit_idx = mc->gate_shift;
 191                 gate->flags = CLK_GATE_SET_TO_DISABLE;
 192                 gate->lock = lock;
 193
 194                 gate_hw = &gate->hw;
 195                 gate_ops = &clk_gate_ops;
 196         }
 197
 198         if (mc->divider_shift >= 0) {
 199                 div = kzalloc(sizeof(*div), GFP_KERNEL);
 200                 if (!div) {
 201                         ret = -ENOMEM;
 202                         goto err_out;
 203                 }
 204
 205                 div->reg = base + mc->divider_reg;
 206                 div->shift = mc->divider_shift;
 207                 div->width = mc->divider_width;
 208                 div->lock = lock;
 209
 210                 div_hw = &div->hw;
 211                 div_ops = &clk_divider_ops;
 212         }
 213
 214         clk = clk_register_composite(NULL, mc->name, parent_names, num_parents,
 215                 mux_hw, mux_ops,
 216                 div_hw, div_ops,
 217                 gate_hw, gate_ops,
 218                 mc->flags);
 219
 220         if (IS_ERR(clk)) {
 221                 ret = PTR_ERR(clk);
 222                 goto err_out;
 223         }
 224
 225         return clk;
 226 err_out:
 227         kfree(div);
 228         kfree(gate);
 229         kfree(mux);
 230
 231         return ERR_PTR(ret);
 232 }
 233
 234 void mtk_clk_register_composites(const struct mtk_composite *mcs,
 235                 int num, void __iomem *base, spinlock_t *lock,
 236                 struct clk_onecell_data *clk_data)
 237 {
 238         struct clk *clk;
 239         int i;
 240
 241         for (i = 0; i < num; i++) {
 242                 const struct mtk_composite *mc = &mcs[i];
 243
 244                 if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[mc->id]))
 245                         continue;
 246
 247                 clk = mtk_clk_register_composite(mc, base, lock);
 248
 249                 if (IS_ERR(clk)) {
 250                         pr_err("Failed to register clk %s: %ld\n",
 251                                         mc->name, PTR_ERR(clk));
 252                         continue;
 253                 }
 254
 255                 if (clk_data)
 256                         clk_data->clks[mc->id] = clk;
 257         }
 258 }
 259
 260 void mtk_clk_register_dividers(const struct mtk_clk_divider *mcds,
 261                         int num, void __iomem *base, spinlock_t *lock,
 262                                 struct clk_onecell_data *clk_data)
 263 {
 264         struct clk *clk;
 265         int i;
 266
 267         for (i = 0; i <  num; i++) {
 268                 const struct mtk_clk_divider *mcd = &mcds[i];
 269
 270                 if (clk_data && !IS_ERR_OR_NULL(clk_data->clks[mcd->id]))
 271                         continue;
 272
 273                 clk = clk_register_divider(NULL, mcd->name, mcd->parent_name,
 274                         mcd->flags, base +  mcd->div_reg, mcd->div_shift,
 275                         mcd->div_width, mcd->clk_divider_flags, lock);
 276
 277                 if (IS_ERR(clk)) {
 278                         pr_err("Failed to register clk %s: %ld\n",
 279                                 mcd->name, PTR_ERR(clk));
 280                         continue;
 281                 }
 282
 283                 if (clk_data)
 284                         clk_data->clks[mcd->id] = clk;
 285         }
 286 }