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                 clk = clk_register_fixed_rate(NULL, rc->name, rc->parent, 0,
  62                                               rc->rate);
  63
  64                 if (IS_ERR(clk)) {
  65                         pr_err("Failed to register clk %s: %ld\n",
  66                                         rc->name, PTR_ERR(clk));
  67                         continue;
  68                 }
  69
  70                 if (clk_data)
  71                         clk_data->clks[rc->id] = clk;
  72         }
  73 }
  74
  75 void mtk_clk_register_factors(const struct mtk_fixed_factor *clks,
  76                 int num, struct clk_onecell_data *clk_data)
  77 {
  78         int i;
  79         struct clk *clk;
  80
  81         for (i = 0; i < num; i++) {
  82                 const struct mtk_fixed_factor *ff = &clks[i];
  83
  84                 clk = clk_register_fixed_factor(NULL, ff->name, ff->parent_name,
  85                                 CLK_SET_RATE_PARENT, ff->mult, ff->div);
  86
  87                 if (IS_ERR(clk)) {
  88                         pr_err("Failed to register clk %s: %ld\n",
  89                                         ff->name, PTR_ERR(clk));
  90                         continue;
  91                 }
  92
  93                 if (clk_data)
  94                         clk_data->clks[ff->id] = clk;
  95         }
  96 }
  97
  98 int mtk_clk_register_gates(struct device_node *node,
  99                 const struct mtk_gate *clks,
 100                 int num, struct clk_onecell_data *clk_data)
 101 {
 102         int i;
 103         struct clk *clk;
 104         struct regmap *regmap;
 105
 106         if (!clk_data)
 107                 return -ENOMEM;
 108
 109         regmap = syscon_node_to_regmap(node);
 110         if (IS_ERR(regmap)) {
 111                 pr_err("Cannot find regmap for %s: %ld\n", node->full_name,
 112                                 PTR_ERR(regmap));
 113                 return PTR_ERR(regmap);
 114         }
 115
 116         for (i = 0; i < num; i++) {
 117                 const struct mtk_gate *gate = &clks[i];
 118
 119                 clk = mtk_clk_register_gate(gate->name, gate->parent_name,
 120                                 regmap,
 121                                 gate->regs->set_ofs,
 122                                 gate->regs->clr_ofs,
 123                                 gate->regs->sta_ofs,
 124                                 gate->shift, gate->ops);
 125
 126                 if (IS_ERR(clk)) {
 127                         pr_err("Failed to register clk %s: %ld\n",
 128                                         gate->name, PTR_ERR(clk));
 129                         continue;
 130                 }
 131
 132                 clk_data->clks[gate->id] = clk;
 133         }
 134
 135         return 0;
 136 }
 137
 138 struct clk *mtk_clk_register_composite(const struct mtk_composite *mc,
 139                 void __iomem *base, spinlock_t *lock)
 140 {
 141         struct clk *clk;
 142         struct clk_mux *mux = NULL;
 143         struct clk_gate *gate = NULL;
 144         struct clk_divider *div = NULL;
 145         struct clk_hw *mux_hw = NULL, *gate_hw = NULL, *div_hw = NULL;
 146         const struct clk_ops *mux_ops = NULL, *gate_ops = NULL, *div_ops = NULL;
 147         const char * const *parent_names;
 148         const char *parent;
 149         int num_parents;
 150         int ret;
 151
 152         if (mc->mux_shift >= 0) {
 153                 mux = kzalloc(sizeof(*mux), GFP_KERNEL);
 154                 if (!mux)
 155                         return ERR_PTR(-ENOMEM);
 156
 157                 mux->reg = base + mc->mux_reg;
 158                 mux->mask = BIT(mc->mux_width) - 1;
 159                 mux->shift = mc->mux_shift;
 160                 mux->lock = lock;
 161
 162                 mux_hw = &mux->hw;
 163                 mux_ops = &clk_mux_ops;
 164
 165                 parent_names = mc->parent_names;
 166                 num_parents = mc->num_parents;
 167         } else {
 168                 parent = mc->parent;
 169                 parent_names = &parent;
 170                 num_parents = 1;
 171         }
 172
 173         if (mc->gate_shift >= 0) {
 174                 gate = kzalloc(sizeof(*gate), GFP_KERNEL);
 175                 if (!gate) {
 176                         ret = -ENOMEM;
 177                         goto err_out;
 178                 }
 179
 180                 gate->reg = base + mc->gate_reg;
 181                 gate->bit_idx = mc->gate_shift;
 182                 gate->flags = CLK_GATE_SET_TO_DISABLE;
 183                 gate->lock = lock;
 184
 185                 gate_hw = &gate->hw;
 186                 gate_ops = &clk_gate_ops;
 187         }
 188
 189         if (mc->divider_shift >= 0) {
 190                 div = kzalloc(sizeof(*div), GFP_KERNEL);
 191                 if (!div) {
 192                         ret = -ENOMEM;
 193                         goto err_out;
 194                 }
 195
 196                 div->reg = base + mc->divider_reg;
 197                 div->shift = mc->divider_shift;
 198                 div->width = mc->divider_width;
 199                 div->lock = lock;
 200
 201                 div_hw = &div->hw;
 202                 div_ops = &clk_divider_ops;
 203         }
 204
 205         clk = clk_register_composite(NULL, mc->name, parent_names, num_parents,
 206                 mux_hw, mux_ops,
 207                 div_hw, div_ops,
 208                 gate_hw, gate_ops,
 209                 mc->flags);
 210
 211         if (IS_ERR(clk)) {
 212                 ret = PTR_ERR(clk);
 213                 goto err_out;
 214         }
 215
 216         return clk;
 217 err_out:
 218         kfree(div);
 219         kfree(gate);
 220         kfree(mux);
 221
 222         return ERR_PTR(ret);
 223 }
 224
 225 void mtk_clk_register_composites(const struct mtk_composite *mcs,
 226                 int num, void __iomem *base, spinlock_t *lock,
 227                 struct clk_onecell_data *clk_data)
 228 {
 229         struct clk *clk;
 230         int i;
 231
 232         for (i = 0; i < num; i++) {
 233                 const struct mtk_composite *mc = &mcs[i];
 234
 235                 clk = mtk_clk_register_composite(mc, base, lock);
 236
 237                 if (IS_ERR(clk)) {
 238                         pr_err("Failed to register clk %s: %ld\n",
 239                                         mc->name, PTR_ERR(clk));
 240                         continue;
 241                 }
 242
 243                 if (clk_data)
 244                         clk_data->clks[mc->id] = clk;
 245         }
 246 }