drivers/clk/tegra/clk-tegra-audio.c

   1 /*
   2  * Copyright (c) 2012, 2013, NVIDIA CORPORATION.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License
  14  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15  */
  16
  17 #include <linux/io.h>
  18 #include <linux/clk-provider.h>
  19 #include <linux/of.h>
  20 #include <linux/of_address.h>
  21 #include <linux/delay.h>
  22 #include <linux/export.h>
  23 #include <linux/clk/tegra.h>
  24
  25 #include "clk.h"
  26 #include "clk-id.h"
  27
  28 #define AUDIO_SYNC_CLK_I2S0 0x4a0
  29 #define AUDIO_SYNC_CLK_I2S1 0x4a4
  30 #define AUDIO_SYNC_CLK_I2S2 0x4a8
  31 #define AUDIO_SYNC_CLK_I2S3 0x4ac
  32 #define AUDIO_SYNC_CLK_I2S4 0x4b0
  33 #define AUDIO_SYNC_CLK_SPDIF 0x4b4
  34
  35 #define AUDIO_SYNC_DOUBLER 0x49c
  36
  37 #define PLLA_OUT 0xb4
  38
  39 struct tegra_sync_source_initdata {
  40         char            *name;
  41         unsigned long   rate;
  42         unsigned long   max_rate;
  43         int             clk_id;
  44 };
  45
  46 #define SYNC(_name) \
  47         {\
  48                 .name           = #_name,\
  49                 .rate           = 24000000,\
  50                 .max_rate       = 24000000,\
  51                 .clk_id         = tegra_clk_ ## _name,\
  52         }
  53
  54 struct tegra_audio_clk_initdata {
  55         char            *gate_name;
  56         char            *mux_name;
  57         u32             offset;
  58         int             gate_clk_id;
  59         int             mux_clk_id;
  60 };
  61
  62 #define AUDIO(_name, _offset) \
  63         {\
  64                 .gate_name      = #_name,\
  65                 .mux_name       = #_name"_mux",\
  66                 .offset         = _offset,\
  67                 .gate_clk_id    = tegra_clk_ ## _name,\
  68                 .mux_clk_id     = tegra_clk_ ## _name ## _mux,\
  69         }
  70
  71 struct tegra_audio2x_clk_initdata {
  72         char            *parent;
  73         char            *gate_name;
  74         char            *name_2x;
  75         char            *div_name;
  76         int             clk_id;
  77         int             clk_num;
  78         u8              div_offset;
  79 };
  80
  81 #define AUDIO2X(_name, _num, _offset) \
  82         {\
  83                 .parent         = #_name,\
  84                 .gate_name      = #_name"_2x",\
  85                 .name_2x        = #_name"_doubler",\
  86                 .div_name       = #_name"_div",\
  87                 .clk_id         = tegra_clk_ ## _name ## _2x,\
  88                 .clk_num        = _num,\
  89                 .div_offset     = _offset,\
  90         }
  91
  92 static DEFINE_SPINLOCK(clk_doubler_lock);
  93
  94 static const char *mux_audio_sync_clk[] = { "spdif_in_sync", "i2s0_sync",
  95         "i2s1_sync", "i2s2_sync", "i2s3_sync", "i2s4_sync", "vimclk_sync",
  96 };
  97
  98 static struct tegra_sync_source_initdata sync_source_clks[] __initdata = {
  99         SYNC(spdif_in_sync),
 100         SYNC(i2s0_sync),
 101         SYNC(i2s1_sync),
 102         SYNC(i2s2_sync),
 103         SYNC(i2s3_sync),
 104         SYNC(i2s4_sync),
 105         SYNC(vimclk_sync),
 106 };
 107
 108 static struct tegra_audio_clk_initdata audio_clks[] = {
 109         AUDIO(audio0, AUDIO_SYNC_CLK_I2S0),
 110         AUDIO(audio1, AUDIO_SYNC_CLK_I2S1),
 111         AUDIO(audio2, AUDIO_SYNC_CLK_I2S2),
 112         AUDIO(audio3, AUDIO_SYNC_CLK_I2S3),
 113         AUDIO(audio4, AUDIO_SYNC_CLK_I2S4),
 114         AUDIO(spdif, AUDIO_SYNC_CLK_SPDIF),
 115 };
 116
 117 static struct tegra_audio2x_clk_initdata audio2x_clks[] = {
 118         AUDIO2X(audio0, 113, 24),
 119         AUDIO2X(audio1, 114, 25),
 120         AUDIO2X(audio2, 115, 26),
 121         AUDIO2X(audio3, 116, 27),
 122         AUDIO2X(audio4, 117, 28),
 123         AUDIO2X(spdif, 118, 29),
 124 };
 125
 126 void __init tegra_audio_clk_init(void __iomem *clk_base,
 127                         void __iomem *pmc_base, struct tegra_clk *tegra_clks,
 128                         struct tegra_audio_clk_info *audio_info,
 129                         unsigned int num_plls)
 130 {
 131         struct clk *clk;
 132         struct clk **dt_clk;
 133         int i;
 134
 135         if (!audio_info || num_plls < 1) {
 136                 pr_err("No audio data passed to tegra_audio_clk_init\n");
 137                 WARN_ON(1);
 138                 return;
 139         }
 140
 141         for (i = 0; i < num_plls; i++) {
 142                 struct tegra_audio_clk_info *info = &audio_info[i];
 143
 144                 dt_clk = tegra_lookup_dt_id(info->clk_id, tegra_clks);
 145                 if (dt_clk) {
 146                         clk = tegra_clk_register_pll(info->name, info->parent,
 147                                         clk_base, pmc_base, 0, info->pll_params,
 148                                         NULL);
 149                         *dt_clk = clk;
 150                 }
 151         }
 152
 153         /* PLLA_OUT0 */
 154         dt_clk = tegra_lookup_dt_id(tegra_clk_pll_a_out0, tegra_clks);
 155         if (dt_clk) {
 156                 clk = tegra_clk_register_divider("pll_a_out0_div", "pll_a",
 157                                 clk_base + PLLA_OUT, 0, TEGRA_DIVIDER_ROUND_UP,
 158                                 8, 8, 1, NULL);
 159                 clk = tegra_clk_register_pll_out("pll_a_out0", "pll_a_out0_div",
 160                                 clk_base + PLLA_OUT, 1, 0, CLK_IGNORE_UNUSED |
 161                                 CLK_SET_RATE_PARENT, 0, NULL);
 162                 *dt_clk = clk;
 163         }
 164
 165         for (i = 0; i < ARRAY_SIZE(sync_source_clks); i++) {
 166                 struct tegra_sync_source_initdata *data;
 167
 168                 data = &sync_source_clks[i];
 169
 170                 dt_clk = tegra_lookup_dt_id(data->clk_id, tegra_clks);
 171                 if (!dt_clk)
 172                         continue;
 173
 174                 clk = tegra_clk_register_sync_source(data->name,
 175                                         data->rate, data->max_rate);
 176                 *dt_clk = clk;
 177         }
 178
 179         for (i = 0; i < ARRAY_SIZE(audio_clks); i++) {
 180                 struct tegra_audio_clk_initdata *data;
 181
 182                 data = &audio_clks[i];
 183                 dt_clk = tegra_lookup_dt_id(data->mux_clk_id, tegra_clks);
 184
 185                 if (!dt_clk)
 186                         continue;
 187                 clk = clk_register_mux(NULL, data->mux_name, mux_audio_sync_clk,
 188                                         ARRAY_SIZE(mux_audio_sync_clk),
 189                                         CLK_SET_RATE_NO_REPARENT,
 190                                         clk_base + data->offset, 0, 3, 0,
 191                                         NULL);
 192                 *dt_clk = clk;
 193
 194                 dt_clk = tegra_lookup_dt_id(data->gate_clk_id, tegra_clks);
 195                 if (!dt_clk)
 196                         continue;
 197
 198                 clk = clk_register_gate(NULL, data->gate_name, data->mux_name,
 199                                         0, clk_base + data->offset, 4,
 200                                         CLK_GATE_SET_TO_DISABLE, NULL);
 201                 *dt_clk = clk;
 202         }
 203
 204         for (i = 0; i < ARRAY_SIZE(audio2x_clks); i++) {
 205                 struct tegra_audio2x_clk_initdata *data;
 206
 207                 data = &audio2x_clks[i];
 208                 dt_clk = tegra_lookup_dt_id(data->clk_id, tegra_clks);
 209                 if (!dt_clk)
 210                         continue;
 211
 212                 clk = clk_register_fixed_factor(NULL, data->name_2x,
 213                                 data->parent, CLK_SET_RATE_PARENT, 2, 1);
 214                 clk = tegra_clk_register_divider(data->div_name,
 215                                 data->name_2x, clk_base + AUDIO_SYNC_DOUBLER,
 216                                 0, 0, data->div_offset, 1, 0,
 217                                 &clk_doubler_lock);
 218                 clk = tegra_clk_register_periph_gate(data->gate_name,
 219                                 data->div_name, TEGRA_PERIPH_NO_RESET,
 220                                 clk_base, CLK_SET_RATE_PARENT, data->clk_num,
 221                                 periph_clk_enb_refcnt);
 222                 *dt_clk = clk;
 223         }
 224 }
 225