Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1 | /* |
Abhijit Pagare | 8a3ddc7 | 2010-01-26 20:12:54 -0700 | [diff] [blame] | 2 | * OMAP2/3/4 clockdomain framework functions |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 3 | * |
Paul Walmsley | 32a363c | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 4 | * Copyright (C) 2008-2011 Texas Instruments, Inc. |
| 5 | * Copyright (C) 2008-2011 Nokia Corporation |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 6 | * |
| 7 | * Written by Paul Walmsley and Jouni Högander |
Abhijit Pagare | 8a3ddc7 | 2010-01-26 20:12:54 -0700 | [diff] [blame] | 8 | * Added OMAP4 specific support by Abhijit Pagare <abhijitpagare@ti.com> |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
Paul Walmsley | 33903eb | 2009-12-08 16:33:10 -0700 | [diff] [blame] | 14 | #undef DEBUG |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 15 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 16 | #include <linux/kernel.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/list.h> |
| 19 | #include <linux/errno.h> |
Paul Gortmaker | d44b28c | 2011-07-31 10:52:44 -0400 | [diff] [blame] | 20 | #include <linux/string.h> |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 21 | #include <linux/delay.h> |
| 22 | #include <linux/clk.h> |
| 23 | #include <linux/limits.h> |
Paul Walmsley | 5b74c67 | 2009-02-03 02:10:03 -0700 | [diff] [blame] | 24 | #include <linux/err.h> |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 25 | #include <linux/clk-provider.h> |
Keerthy | 9bcfb76 | 2018-05-16 20:46:59 +0530 | [diff] [blame] | 26 | #include <linux/cpu_pm.h> |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 27 | |
| 28 | #include <linux/io.h> |
| 29 | |
| 30 | #include <linux/bitops.h> |
| 31 | |
Tony Lindgren | e4c060d | 2012-10-05 13:25:59 -0700 | [diff] [blame] | 32 | #include "soc.h" |
Paul Walmsley | a135eaa | 2012-09-27 10:33:34 -0600 | [diff] [blame] | 33 | #include "clock.h" |
Paul Walmsley | 1540f214 | 2010-12-21 21:05:15 -0700 | [diff] [blame] | 34 | #include "clockdomain.h" |
Keerthy | 9bcfb76 | 2018-05-16 20:46:59 +0530 | [diff] [blame] | 35 | #include "pm.h" |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 36 | |
| 37 | /* clkdm_list contains all registered struct clockdomains */ |
| 38 | static LIST_HEAD(clkdm_list); |
| 39 | |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 40 | /* array of clockdomain deps to be added/removed when clkdm in hwsup mode */ |
| 41 | static struct clkdm_autodep *autodeps; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 42 | |
Rajendra Nayak | 32d4034 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 43 | static struct clkdm_ops *arch_clkdm; |
Keerthy | 9bcfb76 | 2018-05-16 20:46:59 +0530 | [diff] [blame] | 44 | void clkdm_save_context(void); |
| 45 | void clkdm_restore_context(void); |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 46 | |
| 47 | /* Private functions */ |
| 48 | |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 49 | static struct clockdomain *_clkdm_lookup(const char *name) |
| 50 | { |
| 51 | struct clockdomain *clkdm, *temp_clkdm; |
| 52 | |
| 53 | if (!name) |
| 54 | return NULL; |
| 55 | |
| 56 | clkdm = NULL; |
| 57 | |
| 58 | list_for_each_entry(temp_clkdm, &clkdm_list, node) { |
| 59 | if (!strcmp(name, temp_clkdm->name)) { |
| 60 | clkdm = temp_clkdm; |
| 61 | break; |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | return clkdm; |
| 66 | } |
| 67 | |
Paul Walmsley | e909d62a8 | 2010-01-26 20:13:00 -0700 | [diff] [blame] | 68 | /** |
| 69 | * _clkdm_register - register a clockdomain |
| 70 | * @clkdm: struct clockdomain * to register |
| 71 | * |
| 72 | * Adds a clockdomain to the internal clockdomain list. |
| 73 | * Returns -EINVAL if given a null pointer, -EEXIST if a clockdomain is |
| 74 | * already registered by the provided name, or 0 upon success. |
| 75 | */ |
| 76 | static int _clkdm_register(struct clockdomain *clkdm) |
| 77 | { |
| 78 | struct powerdomain *pwrdm; |
| 79 | |
| 80 | if (!clkdm || !clkdm->name) |
| 81 | return -EINVAL; |
| 82 | |
Paul Walmsley | e909d62a8 | 2010-01-26 20:13:00 -0700 | [diff] [blame] | 83 | pwrdm = pwrdm_lookup(clkdm->pwrdm.name); |
| 84 | if (!pwrdm) { |
| 85 | pr_err("clockdomain: %s: powerdomain %s does not exist\n", |
| 86 | clkdm->name, clkdm->pwrdm.name); |
| 87 | return -EINVAL; |
| 88 | } |
| 89 | clkdm->pwrdm.ptr = pwrdm; |
| 90 | |
| 91 | /* Verify that the clockdomain is not already registered */ |
| 92 | if (_clkdm_lookup(clkdm->name)) |
| 93 | return -EEXIST; |
| 94 | |
| 95 | list_add(&clkdm->node, &clkdm_list); |
| 96 | |
| 97 | pwrdm_add_clkdm(pwrdm, clkdm); |
| 98 | |
| 99 | pr_debug("clockdomain: registered %s\n", clkdm->name); |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 104 | /* _clkdm_deps_lookup - look up the specified clockdomain in a clkdm list */ |
| 105 | static struct clkdm_dep *_clkdm_deps_lookup(struct clockdomain *clkdm, |
| 106 | struct clkdm_dep *deps) |
| 107 | { |
| 108 | struct clkdm_dep *cd; |
| 109 | |
Paul Walmsley | a5ffef6 | 2011-09-14 16:01:21 -0600 | [diff] [blame] | 110 | if (!clkdm || !deps) |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 111 | return ERR_PTR(-EINVAL); |
| 112 | |
| 113 | for (cd = deps; cd->clkdm_name; cd++) { |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 114 | if (!cd->clkdm && cd->clkdm_name) |
| 115 | cd->clkdm = _clkdm_lookup(cd->clkdm_name); |
| 116 | |
| 117 | if (cd->clkdm == clkdm) |
| 118 | break; |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | if (!cd->clkdm_name) |
| 122 | return ERR_PTR(-ENOENT); |
| 123 | |
| 124 | return cd; |
| 125 | } |
| 126 | |
Paul Walmsley | 65958fb | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 127 | /** |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 128 | * _autodep_lookup - resolve autodep clkdm names to clkdm pointers; store |
| 129 | * @autodep: struct clkdm_autodep * to resolve |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 130 | * |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 131 | * Resolve autodep clockdomain names to clockdomain pointers via |
| 132 | * clkdm_lookup() and store the pointers in the autodep structure. An |
| 133 | * "autodep" is a clockdomain sleep/wakeup dependency that is |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 134 | * automatically added and removed whenever clocks in the associated |
| 135 | * clockdomain are enabled or disabled (respectively) when the |
| 136 | * clockdomain is in hardware-supervised mode. Meant to be called |
| 137 | * once at clockdomain layer initialization, since these should remain |
| 138 | * fixed for a particular architecture. No return value. |
Paul Walmsley | b170fbe | 2010-12-21 21:05:15 -0700 | [diff] [blame] | 139 | * |
| 140 | * XXX autodeps are deprecated and should be removed at the earliest |
| 141 | * opportunity |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 142 | */ |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 143 | static void _autodep_lookup(struct clkdm_autodep *autodep) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 144 | { |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 145 | struct clockdomain *clkdm; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 146 | |
| 147 | if (!autodep) |
| 148 | return; |
| 149 | |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 150 | clkdm = clkdm_lookup(autodep->clkdm.name); |
| 151 | if (!clkdm) { |
| 152 | pr_err("clockdomain: autodeps: clockdomain %s does not exist\n", |
| 153 | autodep->clkdm.name); |
| 154 | clkdm = ERR_PTR(-ENOENT); |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 155 | } |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 156 | autodep->clkdm.ptr = clkdm; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 157 | } |
| 158 | |
Paul Walmsley | b170fbe | 2010-12-21 21:05:15 -0700 | [diff] [blame] | 159 | /** |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 160 | * _resolve_clkdm_deps() - resolve clkdm_names in @clkdm_deps to clkdms |
| 161 | * @clkdm: clockdomain that we are resolving dependencies for |
| 162 | * @clkdm_deps: ptr to array of struct clkdm_deps to resolve |
Kalle Jokiniemi | a0219fb | 2009-10-14 16:40:37 -0600 | [diff] [blame] | 163 | * |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 164 | * Iterates through @clkdm_deps, looking up the struct clockdomain named by |
| 165 | * clkdm_name and storing the clockdomain pointer in the struct clkdm_dep. |
Paul Walmsley | b170fbe | 2010-12-21 21:05:15 -0700 | [diff] [blame] | 166 | * No return value. |
Paul Walmsley | b170fbe | 2010-12-21 21:05:15 -0700 | [diff] [blame] | 167 | */ |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 168 | static void _resolve_clkdm_deps(struct clockdomain *clkdm, |
| 169 | struct clkdm_dep *clkdm_deps) |
Kalle Jokiniemi | a0219fb | 2009-10-14 16:40:37 -0600 | [diff] [blame] | 170 | { |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 171 | struct clkdm_dep *cd; |
| 172 | |
| 173 | for (cd = clkdm_deps; cd && cd->clkdm_name; cd++) { |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 174 | if (cd->clkdm) |
| 175 | continue; |
| 176 | cd->clkdm = _clkdm_lookup(cd->clkdm_name); |
| 177 | |
| 178 | WARN(!cd->clkdm, "clockdomain: %s: could not find clkdm %s while resolving dependencies - should never happen", |
| 179 | clkdm->name, cd->clkdm_name); |
| 180 | } |
Kalle Jokiniemi | a0219fb | 2009-10-14 16:40:37 -0600 | [diff] [blame] | 181 | } |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 182 | |
Paul Walmsley | 65958fb | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 183 | /** |
| 184 | * _clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1 (lockless) |
| 185 | * @clkdm1: wake this struct clockdomain * up (dependent) |
| 186 | * @clkdm2: when this struct clockdomain * wakes up (source) |
| 187 | * |
| 188 | * When the clockdomain represented by @clkdm2 wakes up, wake up |
| 189 | * @clkdm1. Implemented in hardware on the OMAP, this feature is |
| 190 | * designed to reduce wakeup latency of the dependent clockdomain @clkdm1. |
| 191 | * Returns -EINVAL if presented with invalid clockdomain pointers, |
| 192 | * -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon |
| 193 | * success. |
| 194 | */ |
| 195 | static int _clkdm_add_wkdep(struct clockdomain *clkdm1, |
| 196 | struct clockdomain *clkdm2) |
| 197 | { |
| 198 | struct clkdm_dep *cd; |
| 199 | int ret = 0; |
| 200 | |
| 201 | if (!clkdm1 || !clkdm2) |
| 202 | return -EINVAL; |
| 203 | |
| 204 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
| 205 | if (IS_ERR(cd)) |
| 206 | ret = PTR_ERR(cd); |
| 207 | |
| 208 | if (!arch_clkdm || !arch_clkdm->clkdm_add_wkdep) |
| 209 | ret = -EINVAL; |
| 210 | |
| 211 | if (ret) { |
| 212 | pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n", |
| 213 | clkdm1->name, clkdm2->name); |
| 214 | return ret; |
| 215 | } |
| 216 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 217 | cd->wkdep_usecount++; |
| 218 | if (cd->wkdep_usecount == 1) { |
Paul Walmsley | 65958fb | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 219 | pr_debug("clockdomain: hardware will wake up %s when %s wakes up\n", |
| 220 | clkdm1->name, clkdm2->name); |
| 221 | |
| 222 | ret = arch_clkdm->clkdm_add_wkdep(clkdm1, clkdm2); |
| 223 | } |
| 224 | |
| 225 | return ret; |
| 226 | } |
| 227 | |
| 228 | /** |
| 229 | * _clkdm_del_wkdep - remove a wakeup dep from clkdm2 to clkdm1 (lockless) |
| 230 | * @clkdm1: wake this struct clockdomain * up (dependent) |
| 231 | * @clkdm2: when this struct clockdomain * wakes up (source) |
| 232 | * |
| 233 | * Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2 |
| 234 | * wakes up. Returns -EINVAL if presented with invalid clockdomain |
| 235 | * pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or |
| 236 | * 0 upon success. |
| 237 | */ |
| 238 | static int _clkdm_del_wkdep(struct clockdomain *clkdm1, |
| 239 | struct clockdomain *clkdm2) |
| 240 | { |
| 241 | struct clkdm_dep *cd; |
| 242 | int ret = 0; |
| 243 | |
| 244 | if (!clkdm1 || !clkdm2) |
| 245 | return -EINVAL; |
| 246 | |
| 247 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
| 248 | if (IS_ERR(cd)) |
| 249 | ret = PTR_ERR(cd); |
| 250 | |
| 251 | if (!arch_clkdm || !arch_clkdm->clkdm_del_wkdep) |
| 252 | ret = -EINVAL; |
| 253 | |
| 254 | if (ret) { |
| 255 | pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n", |
| 256 | clkdm1->name, clkdm2->name); |
| 257 | return ret; |
| 258 | } |
| 259 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 260 | cd->wkdep_usecount--; |
| 261 | if (cd->wkdep_usecount == 0) { |
Paul Walmsley | 65958fb | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 262 | pr_debug("clockdomain: hardware will no longer wake up %s after %s wakes up\n", |
| 263 | clkdm1->name, clkdm2->name); |
| 264 | |
| 265 | ret = arch_clkdm->clkdm_del_wkdep(clkdm1, clkdm2); |
| 266 | } |
| 267 | |
| 268 | return ret; |
| 269 | } |
| 270 | |
| 271 | /** |
| 272 | * _clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1 (lockless) |
| 273 | * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
| 274 | * @clkdm2: when this struct clockdomain * is active (source) |
| 275 | * |
| 276 | * Prevent @clkdm1 from automatically going inactive (and then to |
| 277 | * retention or off) if @clkdm2 is active. Returns -EINVAL if |
| 278 | * presented with invalid clockdomain pointers or called on a machine |
| 279 | * that does not support software-configurable hardware sleep |
| 280 | * dependencies, -ENOENT if the specified dependency cannot be set in |
| 281 | * hardware, or 0 upon success. |
| 282 | */ |
| 283 | static int _clkdm_add_sleepdep(struct clockdomain *clkdm1, |
| 284 | struct clockdomain *clkdm2) |
| 285 | { |
| 286 | struct clkdm_dep *cd; |
| 287 | int ret = 0; |
| 288 | |
| 289 | if (!clkdm1 || !clkdm2) |
| 290 | return -EINVAL; |
| 291 | |
| 292 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); |
| 293 | if (IS_ERR(cd)) |
| 294 | ret = PTR_ERR(cd); |
| 295 | |
| 296 | if (!arch_clkdm || !arch_clkdm->clkdm_add_sleepdep) |
| 297 | ret = -EINVAL; |
| 298 | |
| 299 | if (ret) { |
| 300 | pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n", |
| 301 | clkdm1->name, clkdm2->name); |
| 302 | return ret; |
| 303 | } |
| 304 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 305 | cd->sleepdep_usecount++; |
| 306 | if (cd->sleepdep_usecount == 1) { |
Paul Walmsley | 65958fb | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 307 | pr_debug("clockdomain: will prevent %s from sleeping if %s is active\n", |
| 308 | clkdm1->name, clkdm2->name); |
| 309 | |
| 310 | ret = arch_clkdm->clkdm_add_sleepdep(clkdm1, clkdm2); |
| 311 | } |
| 312 | |
| 313 | return ret; |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * _clkdm_del_sleepdep - remove a sleep dep from clkdm2 to clkdm1 (lockless) |
| 318 | * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
| 319 | * @clkdm2: when this struct clockdomain * is active (source) |
| 320 | * |
| 321 | * Allow @clkdm1 to automatically go inactive (and then to retention or |
| 322 | * off), independent of the activity state of @clkdm2. Returns -EINVAL |
| 323 | * if presented with invalid clockdomain pointers or called on a machine |
| 324 | * that does not support software-configurable hardware sleep dependencies, |
| 325 | * -ENOENT if the specified dependency cannot be cleared in hardware, or |
| 326 | * 0 upon success. |
| 327 | */ |
| 328 | static int _clkdm_del_sleepdep(struct clockdomain *clkdm1, |
| 329 | struct clockdomain *clkdm2) |
| 330 | { |
| 331 | struct clkdm_dep *cd; |
| 332 | int ret = 0; |
| 333 | |
| 334 | if (!clkdm1 || !clkdm2) |
| 335 | return -EINVAL; |
| 336 | |
| 337 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); |
| 338 | if (IS_ERR(cd)) |
| 339 | ret = PTR_ERR(cd); |
| 340 | |
| 341 | if (!arch_clkdm || !arch_clkdm->clkdm_del_sleepdep) |
| 342 | ret = -EINVAL; |
| 343 | |
| 344 | if (ret) { |
| 345 | pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n", |
| 346 | clkdm1->name, clkdm2->name); |
| 347 | return ret; |
| 348 | } |
| 349 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 350 | cd->sleepdep_usecount--; |
| 351 | if (cd->sleepdep_usecount == 0) { |
Paul Walmsley | 65958fb | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 352 | pr_debug("clockdomain: will no longer prevent %s from sleeping if %s is active\n", |
| 353 | clkdm1->name, clkdm2->name); |
| 354 | |
| 355 | ret = arch_clkdm->clkdm_del_sleepdep(clkdm1, clkdm2); |
| 356 | } |
| 357 | |
| 358 | return ret; |
| 359 | } |
| 360 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 361 | /* Public functions */ |
| 362 | |
| 363 | /** |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 364 | * clkdm_register_platform_funcs - register clockdomain implementation fns |
| 365 | * @co: func pointers for arch specific implementations |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 366 | * |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 367 | * Register the list of function pointers used to implement the |
| 368 | * clockdomain functions on different OMAP SoCs. Should be called |
| 369 | * before any other clkdm_register*() function. Returns -EINVAL if |
| 370 | * @co is null, -EEXIST if platform functions have already been |
| 371 | * registered, or 0 upon success. |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 372 | */ |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 373 | int clkdm_register_platform_funcs(struct clkdm_ops *co) |
| 374 | { |
| 375 | if (!co) |
| 376 | return -EINVAL; |
| 377 | |
| 378 | if (arch_clkdm) |
| 379 | return -EEXIST; |
| 380 | |
| 381 | arch_clkdm = co; |
| 382 | |
| 383 | return 0; |
| 384 | }; |
| 385 | |
| 386 | /** |
| 387 | * clkdm_register_clkdms - register SoC clockdomains |
| 388 | * @cs: pointer to an array of struct clockdomain to register |
| 389 | * |
| 390 | * Register the clockdomains available on a particular OMAP SoC. Must |
| 391 | * be called after clkdm_register_platform_funcs(). May be called |
| 392 | * multiple times. Returns -EACCES if called before |
| 393 | * clkdm_register_platform_funcs(); -EINVAL if the argument @cs is |
| 394 | * null; or 0 upon success. |
| 395 | */ |
| 396 | int clkdm_register_clkdms(struct clockdomain **cs) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 397 | { |
| 398 | struct clockdomain **c = NULL; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 399 | |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 400 | if (!arch_clkdm) |
| 401 | return -EACCES; |
Rajendra Nayak | 32d4034 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 402 | |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 403 | if (!cs) |
| 404 | return -EINVAL; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 405 | |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 406 | for (c = cs; *c; c++) |
| 407 | _clkdm_register(*c); |
| 408 | |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | /** |
| 413 | * clkdm_register_autodeps - register autodeps (if required) |
| 414 | * @ia: pointer to a static array of struct clkdm_autodep to register |
| 415 | * |
| 416 | * Register clockdomain "automatic dependencies." These are |
| 417 | * clockdomain wakeup and sleep dependencies that are automatically |
| 418 | * added whenever the first clock inside a clockdomain is enabled, and |
| 419 | * removed whenever the last clock inside a clockdomain is disabled. |
| 420 | * These are currently only used on OMAP3 devices, and are deprecated, |
| 421 | * since they waste energy. However, until the OMAP2/3 IP block |
| 422 | * enable/disable sequence can be converted to match the OMAP4 |
| 423 | * sequence, they are needed. |
| 424 | * |
| 425 | * Must be called only after all of the SoC clockdomains are |
| 426 | * registered, since the function will resolve autodep clockdomain |
| 427 | * names into clockdomain pointers. |
| 428 | * |
| 429 | * The struct clkdm_autodep @ia array must be static, as this function |
| 430 | * does not copy the array elements. |
| 431 | * |
| 432 | * Returns -EACCES if called before any clockdomains have been |
| 433 | * registered, -EINVAL if called with a null @ia argument, -EEXIST if |
| 434 | * autodeps have already been registered, or 0 upon success. |
| 435 | */ |
| 436 | int clkdm_register_autodeps(struct clkdm_autodep *ia) |
| 437 | { |
| 438 | struct clkdm_autodep *a = NULL; |
| 439 | |
| 440 | if (list_empty(&clkdm_list)) |
| 441 | return -EACCES; |
| 442 | |
| 443 | if (!ia) |
| 444 | return -EINVAL; |
| 445 | |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 446 | if (autodeps) |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 447 | return -EEXIST; |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 448 | |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 449 | autodeps = ia; |
| 450 | for (a = autodeps; a->clkdm.ptr; a++) |
| 451 | _autodep_lookup(a); |
| 452 | |
| 453 | return 0; |
| 454 | } |
| 455 | |
Keerthy | 9bcfb76 | 2018-05-16 20:46:59 +0530 | [diff] [blame] | 456 | static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v) |
| 457 | { |
| 458 | switch (cmd) { |
| 459 | case CPU_CLUSTER_PM_ENTER: |
| 460 | if (enable_off_mode) |
| 461 | clkdm_save_context(); |
| 462 | break; |
| 463 | case CPU_CLUSTER_PM_EXIT: |
| 464 | if (enable_off_mode) |
| 465 | clkdm_restore_context(); |
| 466 | break; |
| 467 | } |
| 468 | |
| 469 | return NOTIFY_OK; |
| 470 | } |
| 471 | |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 472 | /** |
| 473 | * clkdm_complete_init - set up the clockdomain layer |
| 474 | * |
| 475 | * Put all clockdomains into software-supervised mode; PM code should |
| 476 | * later enable hardware-supervised mode as appropriate. Must be |
| 477 | * called after clkdm_register_clkdms(). Returns -EACCES if called |
| 478 | * before clkdm_register_clkdms(), or 0 upon success. |
| 479 | */ |
| 480 | int clkdm_complete_init(void) |
| 481 | { |
| 482 | struct clockdomain *clkdm; |
Keerthy | 9bcfb76 | 2018-05-16 20:46:59 +0530 | [diff] [blame] | 483 | static struct notifier_block nb; |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 484 | |
| 485 | if (list_empty(&clkdm_list)) |
| 486 | return -EACCES; |
| 487 | |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 488 | list_for_each_entry(clkdm, &clkdm_list, node) { |
Tero Kristo | 1d9a542 | 2016-06-30 16:15:02 +0300 | [diff] [blame] | 489 | clkdm_deny_idle(clkdm); |
Paul Walmsley | 6f7f63c | 2010-09-14 15:56:53 -0600 | [diff] [blame] | 490 | |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 491 | _resolve_clkdm_deps(clkdm, clkdm->wkdep_srcs); |
Paul Walmsley | 6f7f63c | 2010-09-14 15:56:53 -0600 | [diff] [blame] | 492 | clkdm_clear_all_wkdeps(clkdm); |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 493 | |
| 494 | _resolve_clkdm_deps(clkdm, clkdm->sleepdep_srcs); |
Paul Walmsley | 6f7f63c | 2010-09-14 15:56:53 -0600 | [diff] [blame] | 495 | clkdm_clear_all_sleepdeps(clkdm); |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 496 | } |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 497 | |
Keerthy | 9bcfb76 | 2018-05-16 20:46:59 +0530 | [diff] [blame] | 498 | /* Only AM43XX can lose clkdm context during rtc-ddr suspend */ |
| 499 | if (soc_is_am43xx()) { |
| 500 | nb.notifier_call = cpu_notifier; |
| 501 | cpu_pm_register_notifier(&nb); |
| 502 | } |
| 503 | |
Paul Walmsley | 08cb970 | 2011-09-14 16:01:20 -0600 | [diff] [blame] | 504 | return 0; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 505 | } |
| 506 | |
| 507 | /** |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 508 | * clkdm_lookup - look up a clockdomain by name, return a pointer |
| 509 | * @name: name of clockdomain |
| 510 | * |
Paul Walmsley | f0271d6 | 2010-01-26 20:13:02 -0700 | [diff] [blame] | 511 | * Find a registered clockdomain by its name @name. Returns a pointer |
| 512 | * to the struct clockdomain if found, or NULL otherwise. |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 513 | */ |
| 514 | struct clockdomain *clkdm_lookup(const char *name) |
| 515 | { |
| 516 | struct clockdomain *clkdm, *temp_clkdm; |
| 517 | |
| 518 | if (!name) |
| 519 | return NULL; |
| 520 | |
| 521 | clkdm = NULL; |
| 522 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 523 | list_for_each_entry(temp_clkdm, &clkdm_list, node) { |
| 524 | if (!strcmp(name, temp_clkdm->name)) { |
| 525 | clkdm = temp_clkdm; |
| 526 | break; |
| 527 | } |
| 528 | } |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 529 | |
| 530 | return clkdm; |
| 531 | } |
| 532 | |
| 533 | /** |
| 534 | * clkdm_for_each - call function on each registered clockdomain |
| 535 | * @fn: callback function * |
| 536 | * |
Paul Walmsley | f0271d6 | 2010-01-26 20:13:02 -0700 | [diff] [blame] | 537 | * Call the supplied function @fn for each registered clockdomain. |
| 538 | * The callback function @fn can return anything but 0 to bail |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 539 | * out early from the iterator. The callback function is called with |
| 540 | * the clkdm_mutex held, so no clockdomain structure manipulation |
| 541 | * functions should be called from the callback, although hardware |
| 542 | * clockdomain control functions are fine. Returns the last return |
| 543 | * value of the callback function, which should be 0 for success or |
| 544 | * anything else to indicate failure; or -EINVAL if the function pointer |
| 545 | * is null. |
| 546 | */ |
Peter 'p2' De Schrijver | a23456e | 2008-10-15 18:13:47 +0300 | [diff] [blame] | 547 | int clkdm_for_each(int (*fn)(struct clockdomain *clkdm, void *user), |
| 548 | void *user) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 549 | { |
| 550 | struct clockdomain *clkdm; |
| 551 | int ret = 0; |
| 552 | |
| 553 | if (!fn) |
| 554 | return -EINVAL; |
| 555 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 556 | list_for_each_entry(clkdm, &clkdm_list, node) { |
Peter 'p2' De Schrijver | a23456e | 2008-10-15 18:13:47 +0300 | [diff] [blame] | 557 | ret = (*fn)(clkdm, user); |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 558 | if (ret) |
| 559 | break; |
| 560 | } |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 561 | |
| 562 | return ret; |
| 563 | } |
| 564 | |
| 565 | |
Paul Walmsley | e89087c | 2008-05-20 18:41:35 -0600 | [diff] [blame] | 566 | /** |
| 567 | * clkdm_get_pwrdm - return a ptr to the pwrdm that this clkdm resides in |
| 568 | * @clkdm: struct clockdomain * |
| 569 | * |
| 570 | * Return a pointer to the struct powerdomain that the specified clockdomain |
Paul Walmsley | f0271d6 | 2010-01-26 20:13:02 -0700 | [diff] [blame] | 571 | * @clkdm exists in, or returns NULL if @clkdm is NULL. |
Paul Walmsley | e89087c | 2008-05-20 18:41:35 -0600 | [diff] [blame] | 572 | */ |
| 573 | struct powerdomain *clkdm_get_pwrdm(struct clockdomain *clkdm) |
| 574 | { |
| 575 | if (!clkdm) |
| 576 | return NULL; |
| 577 | |
Paul Walmsley | 5b74c67 | 2009-02-03 02:10:03 -0700 | [diff] [blame] | 578 | return clkdm->pwrdm.ptr; |
Paul Walmsley | e89087c | 2008-05-20 18:41:35 -0600 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 582 | /* Hardware clockdomain control */ |
| 583 | |
| 584 | /** |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 585 | * clkdm_add_wkdep - add a wakeup dependency from clkdm2 to clkdm1 |
| 586 | * @clkdm1: wake this struct clockdomain * up (dependent) |
| 587 | * @clkdm2: when this struct clockdomain * wakes up (source) |
| 588 | * |
| 589 | * When the clockdomain represented by @clkdm2 wakes up, wake up |
| 590 | * @clkdm1. Implemented in hardware on the OMAP, this feature is |
| 591 | * designed to reduce wakeup latency of the dependent clockdomain @clkdm1. |
| 592 | * Returns -EINVAL if presented with invalid clockdomain pointers, |
| 593 | * -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or 0 upon |
| 594 | * success. |
| 595 | */ |
| 596 | int clkdm_add_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
| 597 | { |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 598 | struct clkdm_dep *cd; |
| 599 | int ret; |
| 600 | |
| 601 | if (!clkdm1 || !clkdm2) |
| 602 | return -EINVAL; |
| 603 | |
| 604 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
| 605 | if (IS_ERR(cd)) |
| 606 | return PTR_ERR(cd); |
| 607 | |
| 608 | pwrdm_lock(cd->clkdm->pwrdm.ptr); |
| 609 | ret = _clkdm_add_wkdep(clkdm1, clkdm2); |
| 610 | pwrdm_unlock(cd->clkdm->pwrdm.ptr); |
| 611 | |
| 612 | return ret; |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 613 | } |
| 614 | |
| 615 | /** |
| 616 | * clkdm_del_wkdep - remove a wakeup dependency from clkdm2 to clkdm1 |
| 617 | * @clkdm1: wake this struct clockdomain * up (dependent) |
| 618 | * @clkdm2: when this struct clockdomain * wakes up (source) |
| 619 | * |
| 620 | * Remove a wakeup dependency causing @clkdm1 to wake up when @clkdm2 |
| 621 | * wakes up. Returns -EINVAL if presented with invalid clockdomain |
| 622 | * pointers, -ENOENT if @clkdm2 cannot wake up clkdm1 in hardware, or |
| 623 | * 0 upon success. |
| 624 | */ |
| 625 | int clkdm_del_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
| 626 | { |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 627 | struct clkdm_dep *cd; |
| 628 | int ret; |
| 629 | |
| 630 | if (!clkdm1 || !clkdm2) |
| 631 | return -EINVAL; |
| 632 | |
| 633 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
| 634 | if (IS_ERR(cd)) |
| 635 | return PTR_ERR(cd); |
| 636 | |
| 637 | pwrdm_lock(cd->clkdm->pwrdm.ptr); |
| 638 | ret = _clkdm_del_wkdep(clkdm1, clkdm2); |
| 639 | pwrdm_unlock(cd->clkdm->pwrdm.ptr); |
| 640 | |
| 641 | return ret; |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 642 | } |
| 643 | |
| 644 | /** |
| 645 | * clkdm_read_wkdep - read wakeup dependency state from clkdm2 to clkdm1 |
| 646 | * @clkdm1: wake this struct clockdomain * up (dependent) |
| 647 | * @clkdm2: when this struct clockdomain * wakes up (source) |
| 648 | * |
| 649 | * Return 1 if a hardware wakeup dependency exists wherein @clkdm1 will be |
| 650 | * awoken when @clkdm2 wakes up; 0 if dependency is not set; -EINVAL |
| 651 | * if either clockdomain pointer is invalid; or -ENOENT if the hardware |
| 652 | * is incapable. |
| 653 | * |
| 654 | * REVISIT: Currently this function only represents software-controllable |
| 655 | * wakeup dependencies. Wakeup dependencies fixed in hardware are not |
| 656 | * yet handled here. |
| 657 | */ |
| 658 | int clkdm_read_wkdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
| 659 | { |
| 660 | struct clkdm_dep *cd; |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 661 | int ret = 0; |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 662 | |
| 663 | if (!clkdm1 || !clkdm2) |
| 664 | return -EINVAL; |
| 665 | |
| 666 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 667 | if (IS_ERR(cd)) |
| 668 | ret = PTR_ERR(cd); |
| 669 | |
| 670 | if (!arch_clkdm || !arch_clkdm->clkdm_read_wkdep) |
| 671 | ret = -EINVAL; |
| 672 | |
| 673 | if (ret) { |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 674 | pr_debug("clockdomain: hardware cannot set/clear wake up of %s when %s wakes up\n", |
| 675 | clkdm1->name, clkdm2->name); |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 676 | return ret; |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 677 | } |
| 678 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 679 | /* XXX It's faster to return the wkdep_usecount */ |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 680 | return arch_clkdm->clkdm_read_wkdep(clkdm1, clkdm2); |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 681 | } |
| 682 | |
| 683 | /** |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 684 | * clkdm_clear_all_wkdeps - remove all wakeup dependencies from target clkdm |
| 685 | * @clkdm: struct clockdomain * to remove all wakeup dependencies from |
| 686 | * |
| 687 | * Remove all inter-clockdomain wakeup dependencies that could cause |
| 688 | * @clkdm to wake. Intended to be used during boot to initialize the |
| 689 | * PRCM to a known state, after all clockdomains are put into swsup idle |
| 690 | * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or |
| 691 | * 0 upon success. |
| 692 | */ |
| 693 | int clkdm_clear_all_wkdeps(struct clockdomain *clkdm) |
| 694 | { |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 695 | if (!clkdm) |
| 696 | return -EINVAL; |
| 697 | |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 698 | if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_wkdeps) |
| 699 | return -EINVAL; |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 700 | |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 701 | return arch_clkdm->clkdm_clear_all_wkdeps(clkdm); |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 702 | } |
| 703 | |
| 704 | /** |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 705 | * clkdm_add_sleepdep - add a sleep dependency from clkdm2 to clkdm1 |
| 706 | * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
| 707 | * @clkdm2: when this struct clockdomain * is active (source) |
| 708 | * |
| 709 | * Prevent @clkdm1 from automatically going inactive (and then to |
| 710 | * retention or off) if @clkdm2 is active. Returns -EINVAL if |
| 711 | * presented with invalid clockdomain pointers or called on a machine |
| 712 | * that does not support software-configurable hardware sleep |
| 713 | * dependencies, -ENOENT if the specified dependency cannot be set in |
| 714 | * hardware, or 0 upon success. |
| 715 | */ |
| 716 | int clkdm_add_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
| 717 | { |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 718 | struct clkdm_dep *cd; |
| 719 | int ret; |
| 720 | |
| 721 | if (!clkdm1 || !clkdm2) |
| 722 | return -EINVAL; |
| 723 | |
| 724 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
| 725 | if (IS_ERR(cd)) |
| 726 | return PTR_ERR(cd); |
| 727 | |
| 728 | pwrdm_lock(cd->clkdm->pwrdm.ptr); |
| 729 | ret = _clkdm_add_sleepdep(clkdm1, clkdm2); |
| 730 | pwrdm_unlock(cd->clkdm->pwrdm.ptr); |
| 731 | |
| 732 | return ret; |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 733 | } |
| 734 | |
| 735 | /** |
| 736 | * clkdm_del_sleepdep - remove a sleep dependency from clkdm2 to clkdm1 |
| 737 | * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
| 738 | * @clkdm2: when this struct clockdomain * is active (source) |
| 739 | * |
| 740 | * Allow @clkdm1 to automatically go inactive (and then to retention or |
| 741 | * off), independent of the activity state of @clkdm2. Returns -EINVAL |
| 742 | * if presented with invalid clockdomain pointers or called on a machine |
| 743 | * that does not support software-configurable hardware sleep dependencies, |
| 744 | * -ENOENT if the specified dependency cannot be cleared in hardware, or |
| 745 | * 0 upon success. |
| 746 | */ |
| 747 | int clkdm_del_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
| 748 | { |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 749 | struct clkdm_dep *cd; |
| 750 | int ret; |
| 751 | |
| 752 | if (!clkdm1 || !clkdm2) |
| 753 | return -EINVAL; |
| 754 | |
| 755 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->wkdep_srcs); |
| 756 | if (IS_ERR(cd)) |
| 757 | return PTR_ERR(cd); |
| 758 | |
| 759 | pwrdm_lock(cd->clkdm->pwrdm.ptr); |
| 760 | ret = _clkdm_del_sleepdep(clkdm1, clkdm2); |
| 761 | pwrdm_unlock(cd->clkdm->pwrdm.ptr); |
| 762 | |
| 763 | return ret; |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 764 | } |
| 765 | |
| 766 | /** |
| 767 | * clkdm_read_sleepdep - read sleep dependency state from clkdm2 to clkdm1 |
| 768 | * @clkdm1: prevent this struct clockdomain * from sleeping (dependent) |
| 769 | * @clkdm2: when this struct clockdomain * is active (source) |
| 770 | * |
| 771 | * Return 1 if a hardware sleep dependency exists wherein @clkdm1 will |
| 772 | * not be allowed to automatically go inactive if @clkdm2 is active; |
| 773 | * 0 if @clkdm1's automatic power state inactivity transition is independent |
| 774 | * of @clkdm2's; -EINVAL if either clockdomain pointer is invalid or called |
| 775 | * on a machine that does not support software-configurable hardware sleep |
| 776 | * dependencies; or -ENOENT if the hardware is incapable. |
| 777 | * |
| 778 | * REVISIT: Currently this function only represents software-controllable |
| 779 | * sleep dependencies. Sleep dependencies fixed in hardware are not |
| 780 | * yet handled here. |
| 781 | */ |
| 782 | int clkdm_read_sleepdep(struct clockdomain *clkdm1, struct clockdomain *clkdm2) |
| 783 | { |
| 784 | struct clkdm_dep *cd; |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 785 | int ret = 0; |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 786 | |
| 787 | if (!clkdm1 || !clkdm2) |
| 788 | return -EINVAL; |
| 789 | |
| 790 | cd = _clkdm_deps_lookup(clkdm2, clkdm1->sleepdep_srcs); |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 791 | if (IS_ERR(cd)) |
| 792 | ret = PTR_ERR(cd); |
| 793 | |
| 794 | if (!arch_clkdm || !arch_clkdm->clkdm_read_sleepdep) |
| 795 | ret = -EINVAL; |
| 796 | |
| 797 | if (ret) { |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 798 | pr_debug("clockdomain: hardware cannot set/clear sleep dependency affecting %s from %s\n", |
| 799 | clkdm1->name, clkdm2->name); |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 800 | return ret; |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 801 | } |
| 802 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 803 | /* XXX It's faster to return the sleepdep_usecount */ |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 804 | return arch_clkdm->clkdm_read_sleepdep(clkdm1, clkdm2); |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 805 | } |
| 806 | |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 807 | /** |
| 808 | * clkdm_clear_all_sleepdeps - remove all sleep dependencies from target clkdm |
| 809 | * @clkdm: struct clockdomain * to remove all sleep dependencies from |
| 810 | * |
| 811 | * Remove all inter-clockdomain sleep dependencies that could prevent |
| 812 | * @clkdm from idling. Intended to be used during boot to initialize the |
| 813 | * PRCM to a known state, after all clockdomains are put into swsup idle |
| 814 | * and woken up. Returns -EINVAL if @clkdm pointer is invalid, or |
| 815 | * 0 upon success. |
| 816 | */ |
| 817 | int clkdm_clear_all_sleepdeps(struct clockdomain *clkdm) |
| 818 | { |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 819 | if (!clkdm) |
| 820 | return -EINVAL; |
| 821 | |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 822 | if (!arch_clkdm || !arch_clkdm->clkdm_clear_all_sleepdeps) |
| 823 | return -EINVAL; |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 824 | |
Rajendra Nayak | 4aef7a2 | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 825 | return arch_clkdm->clkdm_clear_all_sleepdeps(clkdm); |
Paul Walmsley | 369d561 | 2010-01-26 20:13:01 -0700 | [diff] [blame] | 826 | } |
Paul Walmsley | 55ed969 | 2010-01-26 20:12:59 -0700 | [diff] [blame] | 827 | |
| 828 | /** |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 829 | * clkdm_sleep_nolock - force clockdomain sleep transition (lockless) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 830 | * @clkdm: struct clockdomain * |
| 831 | * |
| 832 | * Instruct the CM to force a sleep transition on the specified |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 833 | * clockdomain @clkdm. Only for use by the powerdomain code. Returns |
| 834 | * -EINVAL if @clkdm is NULL or if clockdomain does not support |
| 835 | * software-initiated sleep; 0 upon success. |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 836 | */ |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 837 | int clkdm_sleep_nolock(struct clockdomain *clkdm) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 838 | { |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 839 | int ret; |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 840 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 841 | if (!clkdm) |
| 842 | return -EINVAL; |
| 843 | |
| 844 | if (!(clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) { |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 845 | pr_debug("clockdomain: %s does not support forcing sleep via software\n", |
| 846 | clkdm->name); |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 847 | return -EINVAL; |
| 848 | } |
| 849 | |
Rajendra Nayak | 68b921a | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 850 | if (!arch_clkdm || !arch_clkdm->clkdm_sleep) |
| 851 | return -EINVAL; |
| 852 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 853 | pr_debug("clockdomain: forcing sleep on %s\n", clkdm->name); |
| 854 | |
Paul Walmsley | 32a363c | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 855 | clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 856 | ret = arch_clkdm->clkdm_sleep(clkdm); |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 857 | ret |= pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
| 858 | |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 859 | return ret; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 860 | } |
| 861 | |
| 862 | /** |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 863 | * clkdm_sleep - force clockdomain sleep transition |
| 864 | * @clkdm: struct clockdomain * |
| 865 | * |
| 866 | * Instruct the CM to force a sleep transition on the specified |
| 867 | * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if |
| 868 | * clockdomain does not support software-initiated sleep; 0 upon |
| 869 | * success. |
| 870 | */ |
| 871 | int clkdm_sleep(struct clockdomain *clkdm) |
| 872 | { |
| 873 | int ret; |
| 874 | |
| 875 | pwrdm_lock(clkdm->pwrdm.ptr); |
| 876 | ret = clkdm_sleep_nolock(clkdm); |
| 877 | pwrdm_unlock(clkdm->pwrdm.ptr); |
| 878 | |
| 879 | return ret; |
| 880 | } |
| 881 | |
| 882 | /** |
| 883 | * clkdm_wakeup_nolock - force clockdomain wakeup transition (lockless) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 884 | * @clkdm: struct clockdomain * |
| 885 | * |
| 886 | * Instruct the CM to force a wakeup transition on the specified |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 887 | * clockdomain @clkdm. Only for use by the powerdomain code. Returns |
| 888 | * -EINVAL if @clkdm is NULL or if the clockdomain does not support |
| 889 | * software-controlled wakeup; 0 upon success. |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 890 | */ |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 891 | int clkdm_wakeup_nolock(struct clockdomain *clkdm) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 892 | { |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 893 | int ret; |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 894 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 895 | if (!clkdm) |
| 896 | return -EINVAL; |
| 897 | |
| 898 | if (!(clkdm->flags & CLKDM_CAN_FORCE_WAKEUP)) { |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 899 | pr_debug("clockdomain: %s does not support forcing wakeup via software\n", |
| 900 | clkdm->name); |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 901 | return -EINVAL; |
| 902 | } |
| 903 | |
Rajendra Nayak | 68b921a | 2011-02-25 16:06:47 -0700 | [diff] [blame] | 904 | if (!arch_clkdm || !arch_clkdm->clkdm_wakeup) |
| 905 | return -EINVAL; |
| 906 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 907 | pr_debug("clockdomain: forcing wakeup on %s\n", clkdm->name); |
| 908 | |
Paul Walmsley | 32a363c | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 909 | clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 910 | ret = arch_clkdm->clkdm_wakeup(clkdm); |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 911 | ret |= pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
| 912 | |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 913 | return ret; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 914 | } |
| 915 | |
| 916 | /** |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 917 | * clkdm_wakeup - force clockdomain wakeup transition |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 918 | * @clkdm: struct clockdomain * |
| 919 | * |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 920 | * Instruct the CM to force a wakeup transition on the specified |
| 921 | * clockdomain @clkdm. Returns -EINVAL if @clkdm is NULL or if the |
| 922 | * clockdomain does not support software-controlled wakeup; 0 upon |
| 923 | * success. |
| 924 | */ |
| 925 | int clkdm_wakeup(struct clockdomain *clkdm) |
| 926 | { |
| 927 | int ret; |
| 928 | |
| 929 | pwrdm_lock(clkdm->pwrdm.ptr); |
| 930 | ret = clkdm_wakeup_nolock(clkdm); |
| 931 | pwrdm_unlock(clkdm->pwrdm.ptr); |
| 932 | |
| 933 | return ret; |
| 934 | } |
| 935 | |
| 936 | /** |
| 937 | * clkdm_allow_idle_nolock - enable hwsup idle transitions for clkdm |
| 938 | * @clkdm: struct clockdomain * |
| 939 | * |
| 940 | * Allow the hardware to automatically switch the clockdomain @clkdm |
| 941 | * into active or idle states, as needed by downstream clocks. If the |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 942 | * clockdomain has any downstream clocks enabled in the clock |
| 943 | * framework, wkdep/sleepdep autodependencies are added; this is so |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 944 | * device drivers can read and write to the device. Only for use by |
| 945 | * the powerdomain code. No return value. |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 946 | */ |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 947 | void clkdm_allow_idle_nolock(struct clockdomain *clkdm) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 948 | { |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 949 | if (!clkdm) |
| 950 | return; |
| 951 | |
Tero Kristo | 1d9a542 | 2016-06-30 16:15:02 +0300 | [diff] [blame] | 952 | if (!WARN_ON(!clkdm->forcewake_count)) |
| 953 | clkdm->forcewake_count--; |
| 954 | |
| 955 | if (clkdm->forcewake_count) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 956 | return; |
Tero Kristo | 1d9a542 | 2016-06-30 16:15:02 +0300 | [diff] [blame] | 957 | |
| 958 | if (!clkdm->usecount && (clkdm->flags & CLKDM_CAN_FORCE_SLEEP)) |
| 959 | clkdm_sleep_nolock(clkdm); |
| 960 | |
| 961 | if (!(clkdm->flags & CLKDM_CAN_ENABLE_AUTO)) |
| 962 | return; |
| 963 | |
| 964 | if (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) |
| 965 | return; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 966 | |
Rajendra Nayak | 5cd1937 | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 967 | if (!arch_clkdm || !arch_clkdm->clkdm_allow_idle) |
| 968 | return; |
| 969 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 970 | pr_debug("clockdomain: enabling automatic idle transitions for %s\n", |
| 971 | clkdm->name); |
| 972 | |
Paul Walmsley | 32a363c | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 973 | clkdm->_flags |= _CLKDM_FLAG_HWSUP_ENABLED; |
Rajendra Nayak | 5cd1937 | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 974 | arch_clkdm->clkdm_allow_idle(clkdm); |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 975 | pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
| 976 | } |
| 977 | |
| 978 | /** |
| 979 | * clkdm_allow_idle - enable hwsup idle transitions for clkdm |
| 980 | * @clkdm: struct clockdomain * |
| 981 | * |
| 982 | * Allow the hardware to automatically switch the clockdomain @clkdm into |
| 983 | * active or idle states, as needed by downstream clocks. If the |
| 984 | * clockdomain has any downstream clocks enabled in the clock |
| 985 | * framework, wkdep/sleepdep autodependencies are added; this is so |
| 986 | * device drivers can read and write to the device. No return value. |
| 987 | */ |
| 988 | void clkdm_allow_idle(struct clockdomain *clkdm) |
| 989 | { |
| 990 | pwrdm_lock(clkdm->pwrdm.ptr); |
| 991 | clkdm_allow_idle_nolock(clkdm); |
| 992 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 993 | } |
| 994 | |
| 995 | /** |
Rajendra Nayak | 5cd1937 | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 996 | * clkdm_deny_idle - disable hwsup idle transitions for clkdm |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 997 | * @clkdm: struct clockdomain * |
| 998 | * |
| 999 | * Prevent the hardware from automatically switching the clockdomain |
Paul Walmsley | f0271d6 | 2010-01-26 20:13:02 -0700 | [diff] [blame] | 1000 | * @clkdm into inactive or idle states. If the clockdomain has |
| 1001 | * downstream clocks enabled in the clock framework, wkdep/sleepdep |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1002 | * autodependencies are removed. Only for use by the powerdomain |
| 1003 | * code. No return value. |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1004 | */ |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1005 | void clkdm_deny_idle_nolock(struct clockdomain *clkdm) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1006 | { |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1007 | if (!clkdm) |
| 1008 | return; |
| 1009 | |
Tero Kristo | 1d9a542 | 2016-06-30 16:15:02 +0300 | [diff] [blame] | 1010 | if (clkdm->forcewake_count++) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1011 | return; |
Tero Kristo | 1d9a542 | 2016-06-30 16:15:02 +0300 | [diff] [blame] | 1012 | |
| 1013 | if (clkdm->flags & CLKDM_CAN_FORCE_WAKEUP) |
| 1014 | clkdm_wakeup_nolock(clkdm); |
| 1015 | |
| 1016 | if (!(clkdm->flags & CLKDM_CAN_DISABLE_AUTO)) |
| 1017 | return; |
| 1018 | |
| 1019 | if (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) |
| 1020 | return; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1021 | |
Rajendra Nayak | 5cd1937 | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 1022 | if (!arch_clkdm || !arch_clkdm->clkdm_deny_idle) |
| 1023 | return; |
| 1024 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1025 | pr_debug("clockdomain: disabling automatic idle transitions for %s\n", |
| 1026 | clkdm->name); |
| 1027 | |
Paul Walmsley | 32a363c | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1028 | clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; |
Rajendra Nayak | 5cd1937 | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 1029 | arch_clkdm->clkdm_deny_idle(clkdm); |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1030 | pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
| 1031 | } |
| 1032 | |
| 1033 | /** |
| 1034 | * clkdm_deny_idle - disable hwsup idle transitions for clkdm |
| 1035 | * @clkdm: struct clockdomain * |
| 1036 | * |
| 1037 | * Prevent the hardware from automatically switching the clockdomain |
| 1038 | * @clkdm into inactive or idle states. If the clockdomain has |
| 1039 | * downstream clocks enabled in the clock framework, wkdep/sleepdep |
| 1040 | * autodependencies are removed. No return value. |
| 1041 | */ |
| 1042 | void clkdm_deny_idle(struct clockdomain *clkdm) |
| 1043 | { |
| 1044 | pwrdm_lock(clkdm->pwrdm.ptr); |
| 1045 | clkdm_deny_idle_nolock(clkdm); |
| 1046 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1047 | } |
| 1048 | |
Paul Walmsley | 32a363c | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1049 | /** |
| 1050 | * clkdm_in_hwsup - is clockdomain @clkdm have hardware-supervised idle enabled? |
| 1051 | * @clkdm: struct clockdomain * |
| 1052 | * |
| 1053 | * Returns true if clockdomain @clkdm currently has |
| 1054 | * hardware-supervised idle enabled, or false if it does not or if |
| 1055 | * @clkdm is NULL. It is only valid to call this function after |
| 1056 | * clkdm_init() has been called. This function does not actually read |
| 1057 | * bits from the hardware; it instead tests an in-memory flag that is |
| 1058 | * changed whenever the clockdomain code changes the auto-idle mode. |
| 1059 | */ |
| 1060 | bool clkdm_in_hwsup(struct clockdomain *clkdm) |
| 1061 | { |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 1062 | bool ret; |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 1063 | |
Paul Walmsley | 32a363c | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1064 | if (!clkdm) |
| 1065 | return false; |
| 1066 | |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 1067 | ret = (clkdm->_flags & _CLKDM_FLAG_HWSUP_ENABLED) ? true : false; |
Rajendra Nayak | 555e74e | 2011-07-10 05:56:55 -0600 | [diff] [blame] | 1068 | |
| 1069 | return ret; |
Paul Walmsley | 32a363c | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1070 | } |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1071 | |
Paul Walmsley | b71c721 | 2012-09-23 17:28:28 -0600 | [diff] [blame] | 1072 | /** |
| 1073 | * clkdm_missing_idle_reporting - can @clkdm enter autoidle even if in use? |
| 1074 | * @clkdm: struct clockdomain * |
| 1075 | * |
| 1076 | * Returns true if clockdomain @clkdm has the |
| 1077 | * CLKDM_MISSING_IDLE_REPORTING flag set, or false if not or @clkdm is |
| 1078 | * null. More information is available in the documentation for the |
| 1079 | * CLKDM_MISSING_IDLE_REPORTING macro. |
| 1080 | */ |
| 1081 | bool clkdm_missing_idle_reporting(struct clockdomain *clkdm) |
| 1082 | { |
| 1083 | if (!clkdm) |
| 1084 | return false; |
| 1085 | |
| 1086 | return (clkdm->flags & CLKDM_MISSING_IDLE_REPORTING) ? true : false; |
| 1087 | } |
| 1088 | |
Paul Walmsley | 65958fb | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 1089 | /* Public autodep handling functions (deprecated) */ |
| 1090 | |
| 1091 | /** |
| 1092 | * clkdm_add_autodeps - add auto sleepdeps/wkdeps to clkdm upon clock enable |
| 1093 | * @clkdm: struct clockdomain * |
| 1094 | * |
| 1095 | * Add the "autodep" sleep & wakeup dependencies to clockdomain 'clkdm' |
| 1096 | * in hardware-supervised mode. Meant to be called from clock framework |
| 1097 | * when a clock inside clockdomain 'clkdm' is enabled. No return value. |
| 1098 | * |
| 1099 | * XXX autodeps are deprecated and should be removed at the earliest |
| 1100 | * opportunity |
| 1101 | */ |
| 1102 | void clkdm_add_autodeps(struct clockdomain *clkdm) |
| 1103 | { |
| 1104 | struct clkdm_autodep *autodep; |
| 1105 | |
| 1106 | if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS) |
| 1107 | return; |
| 1108 | |
| 1109 | for (autodep = autodeps; autodep->clkdm.ptr; autodep++) { |
| 1110 | if (IS_ERR(autodep->clkdm.ptr)) |
| 1111 | continue; |
| 1112 | |
| 1113 | pr_debug("clockdomain: %s: adding %s sleepdep/wkdep\n", |
| 1114 | clkdm->name, autodep->clkdm.ptr->name); |
| 1115 | |
| 1116 | _clkdm_add_sleepdep(clkdm, autodep->clkdm.ptr); |
| 1117 | _clkdm_add_wkdep(clkdm, autodep->clkdm.ptr); |
| 1118 | } |
| 1119 | } |
| 1120 | |
| 1121 | /** |
| 1122 | * clkdm_del_autodeps - remove auto sleepdeps/wkdeps from clkdm |
| 1123 | * @clkdm: struct clockdomain * |
| 1124 | * |
| 1125 | * Remove the "autodep" sleep & wakeup dependencies from clockdomain 'clkdm' |
| 1126 | * in hardware-supervised mode. Meant to be called from clock framework |
| 1127 | * when a clock inside clockdomain 'clkdm' is disabled. No return value. |
| 1128 | * |
| 1129 | * XXX autodeps are deprecated and should be removed at the earliest |
| 1130 | * opportunity |
| 1131 | */ |
| 1132 | void clkdm_del_autodeps(struct clockdomain *clkdm) |
| 1133 | { |
| 1134 | struct clkdm_autodep *autodep; |
| 1135 | |
| 1136 | if (!autodeps || clkdm->flags & CLKDM_NO_AUTODEPS) |
| 1137 | return; |
| 1138 | |
| 1139 | for (autodep = autodeps; autodep->clkdm.ptr; autodep++) { |
| 1140 | if (IS_ERR(autodep->clkdm.ptr)) |
| 1141 | continue; |
| 1142 | |
| 1143 | pr_debug("clockdomain: %s: removing %s sleepdep/wkdep\n", |
| 1144 | clkdm->name, autodep->clkdm.ptr->name); |
| 1145 | |
| 1146 | _clkdm_del_sleepdep(clkdm, autodep->clkdm.ptr); |
| 1147 | _clkdm_del_wkdep(clkdm, autodep->clkdm.ptr); |
| 1148 | } |
| 1149 | } |
| 1150 | |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1151 | /* Clockdomain-to-clock/hwmod framework interface code */ |
| 1152 | |
| 1153 | static int _clkdm_clk_hwmod_enable(struct clockdomain *clkdm) |
| 1154 | { |
| 1155 | if (!clkdm || !arch_clkdm || !arch_clkdm->clkdm_clk_enable) |
| 1156 | return -EINVAL; |
| 1157 | |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1158 | pwrdm_lock(clkdm->pwrdm.ptr); |
Tero Kristo | 64e29fd | 2012-09-25 19:05:32 +0300 | [diff] [blame] | 1159 | |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1160 | /* |
| 1161 | * For arch's with no autodeps, clkcm_clk_enable |
| 1162 | * should be called for every clock instance or hwmod that is |
| 1163 | * enabled, so the clkdm can be force woken up. |
| 1164 | */ |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 1165 | clkdm->usecount++; |
| 1166 | if (clkdm->usecount > 1 && autodeps) { |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1167 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1168 | return 0; |
Tero Kristo | 64e29fd | 2012-09-25 19:05:32 +0300 | [diff] [blame] | 1169 | } |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1170 | |
| 1171 | arch_clkdm->clkdm_clk_enable(clkdm); |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1172 | pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
| 1173 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1174 | |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 1175 | pr_debug("clockdomain: %s: enabled\n", clkdm->name); |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1176 | |
| 1177 | return 0; |
| 1178 | } |
| 1179 | |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1180 | /** |
Rajendra Nayak | 4da71ae | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 1181 | * clkdm_clk_enable - add an enabled downstream clock to this clkdm |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1182 | * @clkdm: struct clockdomain * |
| 1183 | * @clk: struct clk * of the enabled downstream clock |
| 1184 | * |
Paul Walmsley | f0271d6 | 2010-01-26 20:13:02 -0700 | [diff] [blame] | 1185 | * Increment the usecount of the clockdomain @clkdm and ensure that it |
| 1186 | * is awake before @clk is enabled. Intended to be called by |
| 1187 | * clk_enable() code. If the clockdomain is in software-supervised |
| 1188 | * idle mode, force the clockdomain to wake. If the clockdomain is in |
| 1189 | * hardware-supervised idle mode, add clkdm-pwrdm autodependencies, to |
| 1190 | * ensure that devices in the clockdomain can be read from/written to |
| 1191 | * by on-chip processors. Returns -EINVAL if passed null pointers; |
| 1192 | * returns 0 upon success or if the clockdomain is in hwsup idle mode. |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1193 | */ |
Rajendra Nayak | 4da71ae | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 1194 | int clkdm_clk_enable(struct clockdomain *clkdm, struct clk *clk) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1195 | { |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1196 | /* |
| 1197 | * XXX Rewrite this code to maintain a list of enabled |
| 1198 | * downstream clocks for debugging purposes? |
| 1199 | */ |
| 1200 | |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1201 | if (!clk) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1202 | return -EINVAL; |
| 1203 | |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1204 | return _clkdm_clk_hwmod_enable(clkdm); |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1205 | } |
| 1206 | |
| 1207 | /** |
Rajendra Nayak | 4da71ae | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 1208 | * clkdm_clk_disable - remove an enabled downstream clock from this clkdm |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1209 | * @clkdm: struct clockdomain * |
| 1210 | * @clk: struct clk * of the disabled downstream clock |
| 1211 | * |
Paul Walmsley | f0271d6 | 2010-01-26 20:13:02 -0700 | [diff] [blame] | 1212 | * Decrement the usecount of this clockdomain @clkdm when @clk is |
| 1213 | * disabled. Intended to be called by clk_disable() code. If the |
| 1214 | * clockdomain usecount goes to 0, put the clockdomain to sleep |
| 1215 | * (software-supervised mode) or remove the clkdm autodependencies |
| 1216 | * (hardware-supervised mode). Returns -EINVAL if passed null |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1217 | * pointers; -ERANGE if the @clkdm usecount underflows; or returns 0 |
| 1218 | * upon success or if the clockdomain is in hwsup idle mode. |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1219 | */ |
Rajendra Nayak | 4da71ae | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 1220 | int clkdm_clk_disable(struct clockdomain *clkdm, struct clk *clk) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1221 | { |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1222 | if (!clkdm || !clk || !arch_clkdm || !arch_clkdm->clkdm_clk_disable) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1223 | return -EINVAL; |
| 1224 | |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1225 | pwrdm_lock(clkdm->pwrdm.ptr); |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1226 | |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1227 | /* corner case: disabling unused clocks */ |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 1228 | if ((__clk_get_enable_count(clk) == 0) && clkdm->usecount == 0) |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1229 | goto ccd_exit; |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1230 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 1231 | if (clkdm->usecount == 0) { |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1232 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1233 | WARN_ON(1); /* underflow */ |
| 1234 | return -ERANGE; |
| 1235 | } |
| 1236 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 1237 | clkdm->usecount--; |
| 1238 | if (clkdm->usecount > 0) { |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1239 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1240 | return 0; |
| 1241 | } |
| 1242 | |
| 1243 | arch_clkdm->clkdm_clk_disable(clkdm); |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1244 | pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1245 | |
| 1246 | pr_debug("clockdomain: %s: disabled\n", clkdm->name); |
| 1247 | |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1248 | ccd_exit: |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1249 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1250 | |
| 1251 | return 0; |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1252 | } |
Rajendra Nayak | 4da71ae | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 1253 | |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1254 | /** |
| 1255 | * clkdm_hwmod_enable - add an enabled downstream hwmod to this clkdm |
| 1256 | * @clkdm: struct clockdomain * |
| 1257 | * @oh: struct omap_hwmod * of the enabled downstream hwmod |
| 1258 | * |
| 1259 | * Increment the usecount of the clockdomain @clkdm and ensure that it |
| 1260 | * is awake before @oh is enabled. Intended to be called by |
| 1261 | * module_enable() code. |
| 1262 | * If the clockdomain is in software-supervised idle mode, force the |
| 1263 | * clockdomain to wake. If the clockdomain is in hardware-supervised idle |
| 1264 | * mode, add clkdm-pwrdm autodependencies, to ensure that devices in the |
| 1265 | * clockdomain can be read from/written to by on-chip processors. |
| 1266 | * Returns -EINVAL if passed null pointers; |
| 1267 | * returns 0 upon success or if the clockdomain is in hwsup idle mode. |
| 1268 | */ |
| 1269 | int clkdm_hwmod_enable(struct clockdomain *clkdm, struct omap_hwmod *oh) |
| 1270 | { |
| 1271 | /* The clkdm attribute does not exist yet prior OMAP4 */ |
| 1272 | if (cpu_is_omap24xx() || cpu_is_omap34xx()) |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1273 | return 0; |
| 1274 | |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1275 | /* |
| 1276 | * XXX Rewrite this code to maintain a list of enabled |
| 1277 | * downstream hwmods for debugging purposes? |
| 1278 | */ |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1279 | |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1280 | if (!oh) |
| 1281 | return -EINVAL; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1282 | |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1283 | return _clkdm_clk_hwmod_enable(clkdm); |
| 1284 | } |
Peter 'p2' De Schrijver | fe617af | 2008-10-15 17:48:44 +0300 | [diff] [blame] | 1285 | |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1286 | /** |
| 1287 | * clkdm_hwmod_disable - remove an enabled downstream hwmod from this clkdm |
| 1288 | * @clkdm: struct clockdomain * |
| 1289 | * @oh: struct omap_hwmod * of the disabled downstream hwmod |
| 1290 | * |
| 1291 | * Decrement the usecount of this clockdomain @clkdm when @oh is |
| 1292 | * disabled. Intended to be called by module_disable() code. |
| 1293 | * If the clockdomain usecount goes to 0, put the clockdomain to sleep |
| 1294 | * (software-supervised mode) or remove the clkdm autodependencies |
| 1295 | * (hardware-supervised mode). |
| 1296 | * Returns -EINVAL if passed null pointers; -ERANGE if the @clkdm usecount |
| 1297 | * underflows; or returns 0 upon success or if the clockdomain is in hwsup |
| 1298 | * idle mode. |
| 1299 | */ |
| 1300 | int clkdm_hwmod_disable(struct clockdomain *clkdm, struct omap_hwmod *oh) |
| 1301 | { |
| 1302 | /* The clkdm attribute does not exist yet prior OMAP4 */ |
| 1303 | if (cpu_is_omap24xx() || cpu_is_omap34xx()) |
| 1304 | return 0; |
| 1305 | |
| 1306 | /* |
| 1307 | * XXX Rewrite this code to maintain a list of enabled |
| 1308 | * downstream hwmods for debugging purposes? |
| 1309 | */ |
| 1310 | |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1311 | if (!clkdm || !oh || !arch_clkdm || !arch_clkdm->clkdm_clk_disable) |
Benoit Cousson | 113a741 | 2011-07-10 05:56:54 -0600 | [diff] [blame] | 1312 | return -EINVAL; |
| 1313 | |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1314 | pwrdm_lock(clkdm->pwrdm.ptr); |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1315 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 1316 | if (clkdm->usecount == 0) { |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1317 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1318 | WARN_ON(1); /* underflow */ |
| 1319 | return -ERANGE; |
| 1320 | } |
| 1321 | |
Paul Walmsley | 9249387 | 2013-01-26 00:58:17 -0700 | [diff] [blame] | 1322 | clkdm->usecount--; |
| 1323 | if (clkdm->usecount > 0) { |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1324 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1325 | return 0; |
| 1326 | } |
| 1327 | |
| 1328 | arch_clkdm->clkdm_clk_disable(clkdm); |
Paul Walmsley | 3a09028 | 2013-01-26 00:58:16 -0700 | [diff] [blame] | 1329 | pwrdm_state_switch_nolock(clkdm->pwrdm.ptr); |
| 1330 | pwrdm_unlock(clkdm->pwrdm.ptr); |
Mike Turquette | d043d87 | 2012-11-09 11:28:42 -0700 | [diff] [blame] | 1331 | |
| 1332 | pr_debug("clockdomain: %s: disabled\n", clkdm->name); |
| 1333 | |
| 1334 | return 0; |
Paul Walmsley | d459bfe | 2008-08-19 11:08:43 +0300 | [diff] [blame] | 1335 | } |
| 1336 | |
Russ Dill | 1096d1c | 2018-05-16 20:46:58 +0530 | [diff] [blame] | 1337 | /** |
| 1338 | * _clkdm_save_context - save the context for the control of this clkdm |
| 1339 | * |
| 1340 | * Due to a suspend or hibernation operation, the state of the registers |
| 1341 | * controlling this clkdm will be lost, save their context. |
| 1342 | */ |
| 1343 | static int _clkdm_save_context(struct clockdomain *clkdm, void *ununsed) |
| 1344 | { |
| 1345 | if (!arch_clkdm || !arch_clkdm->clkdm_save_context) |
| 1346 | return -EINVAL; |
| 1347 | |
| 1348 | return arch_clkdm->clkdm_save_context(clkdm); |
| 1349 | } |
| 1350 | |
| 1351 | /** |
| 1352 | * _clkdm_restore_context - restore context for control of this clkdm |
| 1353 | * |
| 1354 | * Restore the register values for this clockdomain. |
| 1355 | */ |
| 1356 | static int _clkdm_restore_context(struct clockdomain *clkdm, void *ununsed) |
| 1357 | { |
| 1358 | if (!arch_clkdm || !arch_clkdm->clkdm_restore_context) |
| 1359 | return -EINVAL; |
| 1360 | |
| 1361 | return arch_clkdm->clkdm_restore_context(clkdm); |
| 1362 | } |
| 1363 | |
| 1364 | /** |
| 1365 | * clkdm_save_context - Saves the context for each registered clkdm |
| 1366 | * |
| 1367 | * Save the context for each registered clockdomain. |
| 1368 | */ |
| 1369 | void clkdm_save_context(void) |
| 1370 | { |
| 1371 | clkdm_for_each(_clkdm_save_context, NULL); |
| 1372 | } |
| 1373 | |
| 1374 | /** |
| 1375 | * clkdm_restore_context - Restores the context for each registered clkdm |
| 1376 | * |
| 1377 | * Restore the context for each registered clockdomain. |
| 1378 | */ |
| 1379 | void clkdm_restore_context(void) |
| 1380 | { |
| 1381 | clkdm_for_each(_clkdm_restore_context, NULL); |
| 1382 | } |