Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 1 | /* arch/arm/mach-msm/clock.c |
| 2 | * |
| 3 | * Copyright (C) 2007 Google, Inc. |
Saravana Kannan | c85ecf9 | 2013-01-21 17:58:35 -0800 | [diff] [blame] | 4 | * Copyright (c) 2007-2013, The Linux Foundation. All rights reserved. |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 5 | * |
| 6 | * This software is licensed under the terms of the GNU General Public |
| 7 | * License version 2, as published by the Free Software Foundation, and |
| 8 | * may be copied, distributed, and modified under those terms. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | */ |
| 16 | |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 17 | #include <linux/kernel.h> |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 18 | #include <linux/err.h> |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 19 | #include <linux/spinlock.h> |
Stephen Boyd | bd32344 | 2011-02-23 09:37:42 -0800 | [diff] [blame] | 20 | #include <linux/string.h> |
| 21 | #include <linux/module.h> |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 22 | #include <linux/clk.h> |
Stephen Boyd | bd32344 | 2011-02-23 09:37:42 -0800 | [diff] [blame] | 23 | #include <linux/clkdev.h> |
Matt Wagantall | 158f73b | 2012-05-16 11:29:35 -0700 | [diff] [blame] | 24 | #include <linux/list.h> |
Patrick Daly | ebc26bc | 2013-02-05 11:49:07 -0800 | [diff] [blame] | 25 | #include <linux/regulator/consumer.h> |
Stephen Boyd | 5bc44d5 | 2012-03-29 11:00:57 -0700 | [diff] [blame] | 26 | #include <trace/events/power.h> |
Matt Wagantall | 33d01f5 | 2012-02-23 23:27:44 -0800 | [diff] [blame] | 27 | #include <mach/clk-provider.h> |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 28 | #include "clock.h" |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 29 | |
Matt Wagantall | 158f73b | 2012-05-16 11:29:35 -0700 | [diff] [blame] | 30 | struct handoff_clk { |
| 31 | struct list_head list; |
| 32 | struct clk *clk; |
| 33 | }; |
| 34 | static LIST_HEAD(handoff_list); |
| 35 | |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 36 | /* Find the voltage level required for a given rate. */ |
Patrick Daly | 0a78a0e | 2012-07-23 13:18:59 -0700 | [diff] [blame] | 37 | int find_vdd_level(struct clk *clk, unsigned long rate) |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 38 | { |
| 39 | int level; |
| 40 | |
Saravana Kannan | 55e959d | 2012-10-15 22:16:04 -0700 | [diff] [blame] | 41 | for (level = 0; level < clk->num_fmax; level++) |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 42 | if (rate <= clk->fmax[level]) |
| 43 | break; |
| 44 | |
Saravana Kannan | 55e959d | 2012-10-15 22:16:04 -0700 | [diff] [blame] | 45 | if (level == clk->num_fmax) { |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 46 | pr_err("Rate %lu for %s is greater than highest Fmax\n", rate, |
| 47 | clk->dbg_name); |
| 48 | return -EINVAL; |
| 49 | } |
| 50 | |
| 51 | return level; |
| 52 | } |
| 53 | |
| 54 | /* Update voltage level given the current votes. */ |
| 55 | static int update_vdd(struct clk_vdd_class *vdd_class) |
| 56 | { |
Patrick Daly | ebc26bc | 2013-02-05 11:49:07 -0800 | [diff] [blame] | 57 | int level, rc = 0, i; |
| 58 | struct regulator **r = vdd_class->regulator; |
| 59 | const int **vdd_uv = vdd_class->vdd_uv; |
| 60 | int max_level = vdd_class->num_levels - 1; |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 61 | |
Patrick Daly | ebc26bc | 2013-02-05 11:49:07 -0800 | [diff] [blame] | 62 | for (level = max_level; level > 0; level--) |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 63 | if (vdd_class->level_votes[level]) |
| 64 | break; |
| 65 | |
| 66 | if (level == vdd_class->cur_level) |
| 67 | return 0; |
| 68 | |
Patrick Daly | ebc26bc | 2013-02-05 11:49:07 -0800 | [diff] [blame] | 69 | for (i = 0; i < vdd_class->num_regulators; i++) { |
| 70 | rc = regulator_set_voltage(r[i], vdd_uv[level][i], |
| 71 | vdd_uv[max_level][i]); |
| 72 | if (rc) |
| 73 | goto set_voltage_fail; |
| 74 | } |
| 75 | if (vdd_class->set_vdd && !vdd_class->num_regulators) |
| 76 | rc = vdd_class->set_vdd(vdd_class, level); |
| 77 | |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 78 | if (!rc) |
| 79 | vdd_class->cur_level = level; |
| 80 | |
| 81 | return rc; |
Patrick Daly | ebc26bc | 2013-02-05 11:49:07 -0800 | [diff] [blame] | 82 | |
| 83 | set_voltage_fail: |
| 84 | level = vdd_class->cur_level; |
| 85 | for (i--; i >= 0; i--) |
| 86 | regulator_set_voltage(r[i], vdd_uv[level][i], |
| 87 | vdd_uv[max_level][i]); |
| 88 | |
| 89 | return rc; |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 90 | } |
| 91 | |
| 92 | /* Vote for a voltage level. */ |
| 93 | int vote_vdd_level(struct clk_vdd_class *vdd_class, int level) |
| 94 | { |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 95 | int rc; |
| 96 | |
Saravana Kannan | 55e959d | 2012-10-15 22:16:04 -0700 | [diff] [blame] | 97 | if (level >= vdd_class->num_levels) |
| 98 | return -EINVAL; |
| 99 | |
Stephen Boyd | a1f610a | 2012-09-22 00:40:37 -0700 | [diff] [blame] | 100 | mutex_lock(&vdd_class->lock); |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 101 | vdd_class->level_votes[level]++; |
| 102 | rc = update_vdd(vdd_class); |
| 103 | if (rc) |
| 104 | vdd_class->level_votes[level]--; |
Stephen Boyd | a1f610a | 2012-09-22 00:40:37 -0700 | [diff] [blame] | 105 | mutex_unlock(&vdd_class->lock); |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 106 | |
| 107 | return rc; |
| 108 | } |
| 109 | |
| 110 | /* Remove vote for a voltage level. */ |
| 111 | int unvote_vdd_level(struct clk_vdd_class *vdd_class, int level) |
| 112 | { |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 113 | int rc = 0; |
| 114 | |
Saravana Kannan | 55e959d | 2012-10-15 22:16:04 -0700 | [diff] [blame] | 115 | if (level >= vdd_class->num_levels) |
| 116 | return -EINVAL; |
| 117 | |
Stephen Boyd | a1f610a | 2012-09-22 00:40:37 -0700 | [diff] [blame] | 118 | mutex_lock(&vdd_class->lock); |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 119 | if (WARN(!vdd_class->level_votes[level], |
| 120 | "Reference counts are incorrect for %s level %d\n", |
| 121 | vdd_class->class_name, level)) |
| 122 | goto out; |
| 123 | vdd_class->level_votes[level]--; |
| 124 | rc = update_vdd(vdd_class); |
| 125 | if (rc) |
| 126 | vdd_class->level_votes[level]++; |
| 127 | out: |
Stephen Boyd | a1f610a | 2012-09-22 00:40:37 -0700 | [diff] [blame] | 128 | mutex_unlock(&vdd_class->lock); |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 129 | return rc; |
| 130 | } |
| 131 | |
| 132 | /* Vote for a voltage level corresponding to a clock's rate. */ |
| 133 | static int vote_rate_vdd(struct clk *clk, unsigned long rate) |
| 134 | { |
| 135 | int level; |
| 136 | |
| 137 | if (!clk->vdd_class) |
| 138 | return 0; |
| 139 | |
| 140 | level = find_vdd_level(clk, rate); |
| 141 | if (level < 0) |
| 142 | return level; |
| 143 | |
| 144 | return vote_vdd_level(clk->vdd_class, level); |
| 145 | } |
| 146 | |
| 147 | /* Remove vote for a voltage level corresponding to a clock's rate. */ |
| 148 | static void unvote_rate_vdd(struct clk *clk, unsigned long rate) |
| 149 | { |
| 150 | int level; |
| 151 | |
| 152 | if (!clk->vdd_class) |
| 153 | return; |
| 154 | |
| 155 | level = find_vdd_level(clk, rate); |
| 156 | if (level < 0) |
| 157 | return; |
| 158 | |
| 159 | unvote_vdd_level(clk->vdd_class, level); |
| 160 | } |
| 161 | |
Patrick Daly | c009d9e | 2012-10-01 11:55:27 -0700 | [diff] [blame] | 162 | /* Returns true if the rate is valid without voting for it */ |
| 163 | static bool is_rate_valid(struct clk *clk, unsigned long rate) |
| 164 | { |
| 165 | int level; |
| 166 | |
| 167 | if (!clk->vdd_class) |
| 168 | return true; |
| 169 | |
| 170 | level = find_vdd_level(clk, rate); |
| 171 | return level >= 0; |
| 172 | } |
| 173 | |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 174 | int clk_prepare(struct clk *clk) |
| 175 | { |
| 176 | int ret = 0; |
| 177 | struct clk *parent; |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 178 | |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 179 | if (!clk) |
| 180 | return 0; |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 181 | if (IS_ERR(clk)) |
| 182 | return -EINVAL; |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 183 | |
| 184 | mutex_lock(&clk->prepare_lock); |
| 185 | if (clk->prepare_count == 0) { |
Saravana Kannan | 7a6532e | 2012-10-18 20:51:13 -0700 | [diff] [blame] | 186 | parent = clk->parent; |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 187 | |
| 188 | ret = clk_prepare(parent); |
| 189 | if (ret) |
| 190 | goto out; |
| 191 | ret = clk_prepare(clk->depends); |
| 192 | if (ret) |
| 193 | goto err_prepare_depends; |
| 194 | |
Stephen Boyd | d86d1f2 | 2012-01-24 17:36:34 -0800 | [diff] [blame] | 195 | ret = vote_rate_vdd(clk, clk->rate); |
| 196 | if (ret) |
| 197 | goto err_vote_vdd; |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 198 | if (clk->ops->prepare) |
| 199 | ret = clk->ops->prepare(clk); |
| 200 | if (ret) |
| 201 | goto err_prepare_clock; |
| 202 | } |
| 203 | clk->prepare_count++; |
| 204 | out: |
| 205 | mutex_unlock(&clk->prepare_lock); |
| 206 | return ret; |
| 207 | err_prepare_clock: |
Stephen Boyd | d86d1f2 | 2012-01-24 17:36:34 -0800 | [diff] [blame] | 208 | unvote_rate_vdd(clk, clk->rate); |
| 209 | err_vote_vdd: |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 210 | clk_unprepare(clk->depends); |
| 211 | err_prepare_depends: |
| 212 | clk_unprepare(parent); |
| 213 | goto out; |
| 214 | } |
| 215 | EXPORT_SYMBOL(clk_prepare); |
| 216 | |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 217 | /* |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 218 | * Standard clock functions defined in include/linux/clk.h |
| 219 | */ |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 220 | int clk_enable(struct clk *clk) |
| 221 | { |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 222 | int ret = 0; |
Matt Wagantall | 7205eea | 2011-11-04 17:31:29 -0700 | [diff] [blame] | 223 | unsigned long flags; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 224 | struct clk *parent; |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 225 | const char *name = clk ? clk->dbg_name : NULL; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 226 | |
| 227 | if (!clk) |
| 228 | return 0; |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 229 | if (IS_ERR(clk)) |
| 230 | return -EINVAL; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 231 | |
| 232 | spin_lock_irqsave(&clk->lock, flags); |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 233 | WARN(!clk->prepare_count, |
| 234 | "%s: Don't call enable on unprepared clocks\n", name); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 235 | if (clk->count == 0) { |
Saravana Kannan | 7a6532e | 2012-10-18 20:51:13 -0700 | [diff] [blame] | 236 | parent = clk->parent; |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 237 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 238 | ret = clk_enable(parent); |
| 239 | if (ret) |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 240 | goto err_enable_parent; |
Stephen Boyd | 7fa2674 | 2011-08-11 23:22:29 -0700 | [diff] [blame] | 241 | ret = clk_enable(clk->depends); |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 242 | if (ret) |
| 243 | goto err_enable_depends; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 244 | |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 245 | trace_clock_enable(name, 1, smp_processor_id()); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 246 | if (clk->ops->enable) |
| 247 | ret = clk->ops->enable(clk); |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 248 | if (ret) |
| 249 | goto err_enable_clock; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 250 | } |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 251 | clk->count++; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 252 | spin_unlock_irqrestore(&clk->lock, flags); |
| 253 | |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 254 | return 0; |
| 255 | |
| 256 | err_enable_clock: |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 257 | clk_disable(clk->depends); |
| 258 | err_enable_depends: |
| 259 | clk_disable(parent); |
| 260 | err_enable_parent: |
| 261 | spin_unlock_irqrestore(&clk->lock, flags); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 262 | return ret; |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 263 | } |
| 264 | EXPORT_SYMBOL(clk_enable); |
| 265 | |
| 266 | void clk_disable(struct clk *clk) |
| 267 | { |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 268 | const char *name = clk ? clk->dbg_name : NULL; |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 269 | unsigned long flags; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 270 | |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 271 | if (IS_ERR_OR_NULL(clk)) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 272 | return; |
| 273 | |
| 274 | spin_lock_irqsave(&clk->lock, flags); |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 275 | WARN(!clk->prepare_count, |
| 276 | "%s: Never called prepare or calling disable after unprepare\n", |
| 277 | name); |
| 278 | if (WARN(clk->count == 0, "%s is unbalanced", name)) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 279 | goto out; |
| 280 | if (clk->count == 1) { |
Saravana Kannan | 7a6532e | 2012-10-18 20:51:13 -0700 | [diff] [blame] | 281 | struct clk *parent = clk->parent; |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 282 | |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 283 | trace_clock_disable(name, 0, smp_processor_id()); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 284 | if (clk->ops->disable) |
| 285 | clk->ops->disable(clk); |
Stephen Boyd | 7fa2674 | 2011-08-11 23:22:29 -0700 | [diff] [blame] | 286 | clk_disable(clk->depends); |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 287 | clk_disable(parent); |
| 288 | } |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 289 | clk->count--; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 290 | out: |
| 291 | spin_unlock_irqrestore(&clk->lock, flags); |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 292 | } |
| 293 | EXPORT_SYMBOL(clk_disable); |
| 294 | |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 295 | void clk_unprepare(struct clk *clk) |
| 296 | { |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 297 | const char *name = clk ? clk->dbg_name : NULL; |
| 298 | |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 299 | if (IS_ERR_OR_NULL(clk)) |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 300 | return; |
| 301 | |
| 302 | mutex_lock(&clk->prepare_lock); |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 303 | if (WARN(!clk->prepare_count, "%s is unbalanced (prepare)", name)) |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 304 | goto out; |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 305 | if (clk->prepare_count == 1) { |
Saravana Kannan | 7a6532e | 2012-10-18 20:51:13 -0700 | [diff] [blame] | 306 | struct clk *parent = clk->parent; |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 307 | |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 308 | WARN(clk->count, |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 309 | "%s: Don't call unprepare when the clock is enabled\n", |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 310 | name); |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 311 | |
| 312 | if (clk->ops->unprepare) |
| 313 | clk->ops->unprepare(clk); |
Stephen Boyd | d86d1f2 | 2012-01-24 17:36:34 -0800 | [diff] [blame] | 314 | unvote_rate_vdd(clk, clk->rate); |
Stephen Boyd | 3bbf346 | 2012-01-12 00:19:23 -0800 | [diff] [blame] | 315 | clk_unprepare(clk->depends); |
| 316 | clk_unprepare(parent); |
| 317 | } |
| 318 | clk->prepare_count--; |
| 319 | out: |
| 320 | mutex_unlock(&clk->prepare_lock); |
| 321 | } |
| 322 | EXPORT_SYMBOL(clk_unprepare); |
| 323 | |
Daniel Walker | 5e96da5 | 2010-05-12 13:43:28 -0700 | [diff] [blame] | 324 | int clk_reset(struct clk *clk, enum clk_reset_action action) |
| 325 | { |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 326 | if (IS_ERR_OR_NULL(clk)) |
| 327 | return -EINVAL; |
| 328 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 329 | if (!clk->ops->reset) |
| 330 | return -ENOSYS; |
| 331 | |
| 332 | return clk->ops->reset(clk, action); |
Daniel Walker | 5e96da5 | 2010-05-12 13:43:28 -0700 | [diff] [blame] | 333 | } |
| 334 | EXPORT_SYMBOL(clk_reset); |
| 335 | |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 336 | unsigned long clk_get_rate(struct clk *clk) |
| 337 | { |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 338 | if (IS_ERR_OR_NULL(clk)) |
| 339 | return 0; |
| 340 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 341 | if (!clk->ops->get_rate) |
Tianyi Gou | 7949ecb | 2012-02-14 14:25:32 -0800 | [diff] [blame] | 342 | return clk->rate; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 343 | |
| 344 | return clk->ops->get_rate(clk); |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 345 | } |
| 346 | EXPORT_SYMBOL(clk_get_rate); |
| 347 | |
Matt Wagantall | 77952c4 | 2011-11-08 18:45:48 -0800 | [diff] [blame] | 348 | int clk_set_rate(struct clk *clk, unsigned long rate) |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 349 | { |
Stephen Boyd | d86d1f2 | 2012-01-24 17:36:34 -0800 | [diff] [blame] | 350 | unsigned long start_rate; |
Stephen Boyd | 4fefefc | 2012-04-13 13:37:46 -0700 | [diff] [blame] | 351 | int rc = 0; |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 352 | const char *name = clk ? clk->dbg_name : NULL; |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 353 | |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 354 | if (IS_ERR_OR_NULL(clk)) |
| 355 | return -EINVAL; |
| 356 | |
Matt Wagantall | 77952c4 | 2011-11-08 18:45:48 -0800 | [diff] [blame] | 357 | if (!clk->ops->set_rate) |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 358 | return -ENOSYS; |
Daniel Walker | 3a790bb | 2010-12-13 14:35:10 -0800 | [diff] [blame] | 359 | |
Stephen Boyd | d86d1f2 | 2012-01-24 17:36:34 -0800 | [diff] [blame] | 360 | mutex_lock(&clk->prepare_lock); |
Stephen Boyd | 4fefefc | 2012-04-13 13:37:46 -0700 | [diff] [blame] | 361 | |
| 362 | /* Return early if the rate isn't going to change */ |
| 363 | if (clk->rate == rate) |
| 364 | goto out; |
| 365 | |
Stephen Boyd | 64dce90 | 2012-08-09 12:59:40 -0700 | [diff] [blame] | 366 | trace_clock_set_rate(name, rate, raw_smp_processor_id()); |
Stephen Boyd | d86d1f2 | 2012-01-24 17:36:34 -0800 | [diff] [blame] | 367 | if (clk->prepare_count) { |
Matt Wagantall | 7205eea | 2011-11-04 17:31:29 -0700 | [diff] [blame] | 368 | start_rate = clk->rate; |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 369 | /* Enforce vdd requirements for target frequency. */ |
| 370 | rc = vote_rate_vdd(clk, rate); |
| 371 | if (rc) |
Patrick Daly | c009d9e | 2012-10-01 11:55:27 -0700 | [diff] [blame] | 372 | goto out; |
Matt Wagantall | 77952c4 | 2011-11-08 18:45:48 -0800 | [diff] [blame] | 373 | rc = clk->ops->set_rate(clk, rate); |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 374 | if (rc) |
| 375 | goto err_set_rate; |
| 376 | /* Release vdd requirements for starting frequency. */ |
| 377 | unvote_rate_vdd(clk, start_rate); |
Patrick Daly | c009d9e | 2012-10-01 11:55:27 -0700 | [diff] [blame] | 378 | } else if (is_rate_valid(clk, rate)) { |
Matt Wagantall | 77952c4 | 2011-11-08 18:45:48 -0800 | [diff] [blame] | 379 | rc = clk->ops->set_rate(clk, rate); |
Patrick Daly | c009d9e | 2012-10-01 11:55:27 -0700 | [diff] [blame] | 380 | } else { |
| 381 | rc = -EINVAL; |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 382 | } |
Matt Wagantall | 7205eea | 2011-11-04 17:31:29 -0700 | [diff] [blame] | 383 | |
| 384 | if (!rc) |
| 385 | clk->rate = rate; |
Stephen Boyd | 4fefefc | 2012-04-13 13:37:46 -0700 | [diff] [blame] | 386 | out: |
Stephen Boyd | d86d1f2 | 2012-01-24 17:36:34 -0800 | [diff] [blame] | 387 | mutex_unlock(&clk->prepare_lock); |
Matt Wagantall | e18bbc8 | 2011-10-06 10:07:28 -0700 | [diff] [blame] | 388 | return rc; |
| 389 | |
| 390 | err_set_rate: |
| 391 | unvote_rate_vdd(clk, rate); |
Stephen Boyd | d86d1f2 | 2012-01-24 17:36:34 -0800 | [diff] [blame] | 392 | goto out; |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 393 | } |
Matt Wagantall | 77952c4 | 2011-11-08 18:45:48 -0800 | [diff] [blame] | 394 | EXPORT_SYMBOL(clk_set_rate); |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 395 | |
Daniel Walker | 5e96da5 | 2010-05-12 13:43:28 -0700 | [diff] [blame] | 396 | long clk_round_rate(struct clk *clk, unsigned long rate) |
| 397 | { |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 398 | if (IS_ERR_OR_NULL(clk)) |
| 399 | return -EINVAL; |
| 400 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 401 | if (!clk->ops->round_rate) |
| 402 | return -ENOSYS; |
| 403 | |
| 404 | return clk->ops->round_rate(clk, rate); |
Daniel Walker | 5e96da5 | 2010-05-12 13:43:28 -0700 | [diff] [blame] | 405 | } |
| 406 | EXPORT_SYMBOL(clk_round_rate); |
| 407 | |
Daniel Walker | 5e96da5 | 2010-05-12 13:43:28 -0700 | [diff] [blame] | 408 | int clk_set_max_rate(struct clk *clk, unsigned long rate) |
| 409 | { |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 410 | if (IS_ERR_OR_NULL(clk)) |
| 411 | return -EINVAL; |
| 412 | |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 413 | if (!clk->ops->set_max_rate) |
| 414 | return -ENOSYS; |
| 415 | |
| 416 | return clk->ops->set_max_rate(clk, rate); |
Daniel Walker | 5e96da5 | 2010-05-12 13:43:28 -0700 | [diff] [blame] | 417 | } |
| 418 | EXPORT_SYMBOL(clk_set_max_rate); |
| 419 | |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 420 | int clk_set_parent(struct clk *clk, struct clk *parent) |
| 421 | { |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 422 | if (!clk->ops->set_parent) |
| 423 | return 0; |
| 424 | |
| 425 | return clk->ops->set_parent(clk, parent); |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 426 | } |
| 427 | EXPORT_SYMBOL(clk_set_parent); |
| 428 | |
| 429 | struct clk *clk_get_parent(struct clk *clk) |
| 430 | { |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 431 | if (IS_ERR_OR_NULL(clk)) |
| 432 | return NULL; |
| 433 | |
Saravana Kannan | 7a6532e | 2012-10-18 20:51:13 -0700 | [diff] [blame] | 434 | return clk->parent; |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 435 | } |
| 436 | EXPORT_SYMBOL(clk_get_parent); |
| 437 | |
| 438 | int clk_set_flags(struct clk *clk, unsigned long flags) |
| 439 | { |
Vikram Mulukutla | 55e8f99 | 2012-04-17 19:25:10 -0700 | [diff] [blame] | 440 | if (IS_ERR_OR_NULL(clk)) |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 441 | return -EINVAL; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 442 | if (!clk->ops->set_flags) |
| 443 | return -ENOSYS; |
| 444 | |
| 445 | return clk->ops->set_flags(clk, flags); |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 446 | } |
| 447 | EXPORT_SYMBOL(clk_set_flags); |
| 448 | |
Matt Wagantall | 665f0cf | 2012-02-27 15:54:43 -0800 | [diff] [blame] | 449 | static struct clock_init_data *clk_init_data; |
| 450 | |
Matt Wagantall | 20f8e0f | 2012-09-26 17:28:54 -0700 | [diff] [blame] | 451 | static void init_sibling_lists(struct clk_lookup *clock_tbl, size_t num_clocks) |
| 452 | { |
| 453 | struct clk *clk, *parent; |
| 454 | unsigned n; |
| 455 | |
| 456 | for (n = 0; n < num_clocks; n++) { |
| 457 | clk = clock_tbl[n].clk; |
Saravana Kannan | 7a6532e | 2012-10-18 20:51:13 -0700 | [diff] [blame] | 458 | parent = clk->parent; |
Matt Wagantall | 20f8e0f | 2012-09-26 17:28:54 -0700 | [diff] [blame] | 459 | if (parent && list_empty(&clk->siblings)) |
| 460 | list_add(&clk->siblings, &parent->children); |
| 461 | } |
| 462 | } |
| 463 | |
Matt Wagantall | 665f0cf | 2012-02-27 15:54:43 -0800 | [diff] [blame] | 464 | /** |
| 465 | * msm_clock_register() - Register additional clock tables |
| 466 | * @table: Table of clocks |
| 467 | * @size: Size of @table |
| 468 | * |
| 469 | * Upon return, clock APIs may be used to control clocks registered using this |
| 470 | * function. This API may only be used after msm_clock_init() has completed. |
| 471 | * Unlike msm_clock_init(), this function may be called multiple times with |
| 472 | * different clock lists and used after the kernel has finished booting. |
| 473 | */ |
| 474 | int msm_clock_register(struct clk_lookup *table, size_t size) |
| 475 | { |
| 476 | if (!clk_init_data) |
| 477 | return -ENODEV; |
| 478 | |
| 479 | if (!table) |
| 480 | return -EINVAL; |
| 481 | |
Matt Wagantall | 20f8e0f | 2012-09-26 17:28:54 -0700 | [diff] [blame] | 482 | init_sibling_lists(table, size); |
Matt Wagantall | 665f0cf | 2012-02-27 15:54:43 -0800 | [diff] [blame] | 483 | clkdev_add_table(table, size); |
| 484 | clock_debug_register(table, size); |
| 485 | |
| 486 | return 0; |
| 487 | } |
| 488 | EXPORT_SYMBOL(msm_clock_register); |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 489 | |
Saravana Kannan | c85ecf9 | 2013-01-21 17:58:35 -0800 | [diff] [blame] | 490 | static int __init __handoff_clk(struct clk *clk) |
Matt Wagantall | f30fceb | 2012-06-12 19:13:11 -0700 | [diff] [blame] | 491 | { |
Saravana Kannan | c85ecf9 | 2013-01-21 17:58:35 -0800 | [diff] [blame] | 492 | enum handoff state = HANDOFF_DISABLED_CLK; |
| 493 | struct handoff_clk *h = NULL; |
| 494 | int rc; |
| 495 | |
| 496 | if (clk == NULL || clk->flags & CLKFLAG_INIT_DONE || |
| 497 | clk->flags & CLKFLAG_SKIP_HANDOFF) |
| 498 | return 0; |
| 499 | |
| 500 | if (clk->flags & CLKFLAG_INIT_ERR) |
| 501 | return -ENXIO; |
| 502 | |
| 503 | /* Handoff any 'depends' clock first. */ |
| 504 | rc = __handoff_clk(clk->depends); |
| 505 | if (rc) |
| 506 | goto err; |
Matt Wagantall | f30fceb | 2012-06-12 19:13:11 -0700 | [diff] [blame] | 507 | |
| 508 | /* |
Saravana Kannan | c85ecf9 | 2013-01-21 17:58:35 -0800 | [diff] [blame] | 509 | * Handoff functions for the parent must be called before the |
| 510 | * children can be handed off. Without handing off the parents and |
| 511 | * knowing their rate and state (on/off), it's impossible to figure |
| 512 | * out the rate and state of the children. |
Matt Wagantall | f30fceb | 2012-06-12 19:13:11 -0700 | [diff] [blame] | 513 | */ |
Saravana Kannan | c85ecf9 | 2013-01-21 17:58:35 -0800 | [diff] [blame] | 514 | if (clk->ops->get_parent) |
| 515 | clk->parent = clk->ops->get_parent(clk); |
Matt Wagantall | f30fceb | 2012-06-12 19:13:11 -0700 | [diff] [blame] | 516 | |
Saravana Kannan | c85ecf9 | 2013-01-21 17:58:35 -0800 | [diff] [blame] | 517 | if (IS_ERR(clk->parent)) { |
| 518 | rc = PTR_ERR(clk->parent); |
| 519 | goto err; |
| 520 | } |
Matt Wagantall | f30fceb | 2012-06-12 19:13:11 -0700 | [diff] [blame] | 521 | |
Saravana Kannan | c85ecf9 | 2013-01-21 17:58:35 -0800 | [diff] [blame] | 522 | rc = __handoff_clk(clk->parent); |
| 523 | if (rc) |
| 524 | goto err; |
| 525 | |
| 526 | if (clk->ops->handoff) |
| 527 | state = clk->ops->handoff(clk); |
| 528 | |
| 529 | if (state == HANDOFF_ENABLED_CLK) { |
| 530 | |
| 531 | h = kmalloc(sizeof(*h), GFP_KERNEL); |
| 532 | if (!h) { |
| 533 | rc = -ENOMEM; |
| 534 | goto err; |
Matt Wagantall | f30fceb | 2012-06-12 19:13:11 -0700 | [diff] [blame] | 535 | } |
Saravana Kannan | c85ecf9 | 2013-01-21 17:58:35 -0800 | [diff] [blame] | 536 | |
| 537 | rc = clk_prepare_enable(clk->parent); |
| 538 | if (rc) |
| 539 | goto err; |
| 540 | |
| 541 | rc = clk_prepare_enable(clk->depends); |
| 542 | if (rc) |
| 543 | goto err_depends; |
| 544 | |
| 545 | rc = vote_rate_vdd(clk, clk->rate); |
| 546 | WARN(rc, "%s unable to vote for voltage!\n", clk->dbg_name); |
| 547 | |
| 548 | clk->count = 1; |
| 549 | clk->prepare_count = 1; |
| 550 | h->clk = clk; |
| 551 | list_add_tail(&h->list, &handoff_list); |
| 552 | |
| 553 | pr_debug("Handed off %s rate=%lu\n", clk->dbg_name, clk->rate); |
Matt Wagantall | f30fceb | 2012-06-12 19:13:11 -0700 | [diff] [blame] | 554 | } |
Saravana Kannan | c85ecf9 | 2013-01-21 17:58:35 -0800 | [diff] [blame] | 555 | |
| 556 | clk->flags |= CLKFLAG_INIT_DONE; |
| 557 | |
| 558 | return 0; |
| 559 | |
| 560 | err_depends: |
| 561 | clk_disable_unprepare(clk->parent); |
| 562 | err: |
| 563 | kfree(h); |
| 564 | clk->flags |= CLKFLAG_INIT_ERR; |
| 565 | pr_err("%s handoff failed (%d)\n", clk->dbg_name, rc); |
| 566 | return rc; |
Matt Wagantall | f30fceb | 2012-06-12 19:13:11 -0700 | [diff] [blame] | 567 | } |
| 568 | |
Matt Wagantall | 665f0cf | 2012-02-27 15:54:43 -0800 | [diff] [blame] | 569 | /** |
| 570 | * msm_clock_init() - Register and initialize a clock driver |
| 571 | * @data: Driver-specific clock initialization data |
| 572 | * |
| 573 | * Upon return from this call, clock APIs may be used to control |
| 574 | * clocks registered with this API. |
| 575 | */ |
| 576 | int __init msm_clock_init(struct clock_init_data *data) |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 577 | { |
| 578 | unsigned n; |
Stephen Boyd | 94625ef | 2011-07-12 17:06:01 -0700 | [diff] [blame] | 579 | struct clk_lookup *clock_tbl; |
| 580 | size_t num_clocks; |
Stephen Boyd | bb600ae | 2011-08-02 20:11:40 -0700 | [diff] [blame] | 581 | |
Matt Wagantall | 665f0cf | 2012-02-27 15:54:43 -0800 | [diff] [blame] | 582 | if (!data) |
| 583 | return -EINVAL; |
| 584 | |
Stephen Boyd | bb600ae | 2011-08-02 20:11:40 -0700 | [diff] [blame] | 585 | clk_init_data = data; |
Matt Wagantall | b64888f | 2012-04-02 21:35:07 -0700 | [diff] [blame] | 586 | if (clk_init_data->pre_init) |
| 587 | clk_init_data->pre_init(); |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 588 | |
Stephen Boyd | 94625ef | 2011-07-12 17:06:01 -0700 | [diff] [blame] | 589 | clock_tbl = data->table; |
| 590 | num_clocks = data->size; |
| 591 | |
Matt Wagantall | fba2c5b | 2012-10-18 12:54:15 -0700 | [diff] [blame] | 592 | init_sibling_lists(clock_tbl, num_clocks); |
| 593 | |
Matt Wagantall | b37fea4 | 2012-04-04 16:47:23 -0700 | [diff] [blame] | 594 | /* |
| 595 | * Detect and preserve initial clock state until clock_late_init() or |
| 596 | * a driver explicitly changes it, whichever is first. |
| 597 | */ |
Matt Wagantall | f30fceb | 2012-06-12 19:13:11 -0700 | [diff] [blame] | 598 | for (n = 0; n < num_clocks; n++) |
| 599 | __handoff_clk(clock_tbl[n].clk); |
Daniel Walker | 5e96da5 | 2010-05-12 13:43:28 -0700 | [diff] [blame] | 600 | |
Matt Wagantall | fba2c5b | 2012-10-18 12:54:15 -0700 | [diff] [blame] | 601 | clkdev_add_table(clock_tbl, num_clocks); |
Matt Wagantall | b64888f | 2012-04-02 21:35:07 -0700 | [diff] [blame] | 602 | |
| 603 | if (clk_init_data->post_init) |
| 604 | clk_init_data->post_init(); |
Matt Wagantall | 665f0cf | 2012-02-27 15:54:43 -0800 | [diff] [blame] | 605 | |
Matt Wagantall | fba2c5b | 2012-10-18 12:54:15 -0700 | [diff] [blame] | 606 | clock_debug_init(); |
| 607 | clock_debug_register(clock_tbl, num_clocks); |
| 608 | |
Matt Wagantall | 665f0cf | 2012-02-27 15:54:43 -0800 | [diff] [blame] | 609 | return 0; |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 610 | } |
| 611 | |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 612 | static int __init clock_late_init(void) |
| 613 | { |
Matt Wagantall | 158f73b | 2012-05-16 11:29:35 -0700 | [diff] [blame] | 614 | struct handoff_clk *h, *h_temp; |
Matt Wagantall | 665f0cf | 2012-02-27 15:54:43 -0800 | [diff] [blame] | 615 | int ret = 0; |
Bryan Huntsman | 3f2bc4d | 2011-08-16 17:27:22 -0700 | [diff] [blame] | 616 | |
Matt Wagantall | 647d1c1 | 2012-05-16 14:32:14 -0700 | [diff] [blame] | 617 | pr_info("%s: Removing enables held for handed-off clocks\n", __func__); |
Matt Wagantall | 158f73b | 2012-05-16 11:29:35 -0700 | [diff] [blame] | 618 | list_for_each_entry_safe(h, h_temp, &handoff_list, list) { |
| 619 | clk_disable_unprepare(h->clk); |
| 620 | list_del(&h->list); |
| 621 | kfree(h); |
| 622 | } |
| 623 | |
Stephen Boyd | bb600ae | 2011-08-02 20:11:40 -0700 | [diff] [blame] | 624 | if (clk_init_data->late_init) |
| 625 | ret = clk_init_data->late_init(); |
| 626 | return ret; |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 627 | } |
Brian Swetland | 600f7cf | 2008-09-09 11:04:14 -0700 | [diff] [blame] | 628 | late_initcall(clock_late_init); |