| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Viresh Kumar | 6131 | 85.49% | 88 | 79.28% |
| Nishanth Menon | 630 | 8.78% | 6 | 5.41% |
| Andrew-sh Cheng | 163 | 2.27% | 1 | 0.90% |
| JiSheng Zhang | 73 | 1.02% | 1 | 0.90% |
| Bartlomiej Zolnierkiewicz | 49 | 0.68% | 2 | 1.80% |
| Rajendra Nayak | 46 | 0.64% | 1 | 0.90% |
| Shawn Guo | 23 | 0.32% | 1 | 0.90% |
| Liam Girdwood | 22 | 0.31% | 1 | 0.90% |
| Stephen Boyd | 8 | 0.11% | 1 | 0.90% |
| Andrzej Hajda | 7 | 0.10% | 1 | 0.90% |
| Dmitry Torokhov | 5 | 0.07% | 1 | 0.90% |
| MyungJoo Ham | 5 | 0.07% | 1 | 0.90% |
| Paul Gortmaker | 3 | 0.04% | 1 | 0.90% |
| Thomas Gleixner | 2 | 0.03% | 1 | 0.90% |
| Sudeep Holla | 2 | 0.03% | 1 | 0.90% |
| Waldemar Rymarkiewicz | 1 | 0.01% | 1 | 0.90% |
| Wei Yongjun | 1 | 0.01% | 1 | 0.90% |
| Fabio Estevam | 1 | 0.01% | 1 | 0.90% |
| Total | 7172 | 111 |
// SPDX-License-Identifier: GPL-2.0-only /* * Generic OPP Interface * * Copyright (C) 2009-2010 Texas Instruments Incorporated. * Nishanth Menon * Romit Dasgupta * Kevin Hilman */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/clk.h> #include <linux/errno.h> #include <linux/err.h> #include <linux/slab.h> #include <linux/device.h> #include <linux/export.h> #include <linux/pm_domain.h> #include <linux/regulator/consumer.h> #include "opp.h" /* * The root of the list of all opp-tables. All opp_table structures branch off * from here, with each opp_table containing the list of opps it supports in * various states of availability. */ LIST_HEAD(opp_tables); /* Lock to allow exclusive modification to the device and opp lists */ DEFINE_MUTEX(opp_table_lock); static struct opp_device *_find_opp_dev(const struct device *dev, struct opp_table *opp_table) { struct opp_device *opp_dev; list_for_each_entry(opp_dev, &opp_table->dev_list, node) if (opp_dev->dev == dev) return opp_dev; return NULL; } static struct opp_table *_find_opp_table_unlocked(struct device *dev) { struct opp_table *opp_table; bool found; list_for_each_entry(opp_table, &opp_tables, node) { mutex_lock(&opp_table->lock); found = !!_find_opp_dev(dev, opp_table); mutex_unlock(&opp_table->lock); if (found) { _get_opp_table_kref(opp_table); return opp_table; } } return ERR_PTR(-ENODEV); } /** * _find_opp_table() - find opp_table struct using device pointer * @dev: device pointer used to lookup OPP table * * Search OPP table for one containing matching device. * * Return: pointer to 'struct opp_table' if found, otherwise -ENODEV or * -EINVAL based on type of error. * * The callers must call dev_pm_opp_put_opp_table() after the table is used. */ struct opp_table *_find_opp_table(struct device *dev) { struct opp_table *opp_table; if (IS_ERR_OR_NULL(dev)) { pr_err("%s: Invalid parameters\n", __func__); return ERR_PTR(-EINVAL); } mutex_lock(&opp_table_lock); opp_table = _find_opp_table_unlocked(dev); mutex_unlock(&opp_table_lock); return opp_table; } /** * dev_pm_opp_get_voltage() - Gets the voltage corresponding to an opp * @opp: opp for which voltage has to be returned for * * Return: voltage in micro volt corresponding to the opp, else * return 0 * * This is useful only for devices with single power supply. */ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) { if (IS_ERR_OR_NULL(opp)) { pr_err("%s: Invalid parameters\n", __func__); return 0; } return opp->supplies[0].u_volt; } EXPORT_SYMBOL_GPL(dev_pm_opp_get_voltage); /** * dev_pm_opp_get_freq() - Gets the frequency corresponding to an available opp * @opp: opp for which frequency has to be returned for * * Return: frequency in hertz corresponding to the opp, else * return 0 */ unsigned long dev_pm_opp_get_freq(struct dev_pm_opp *opp) { if (IS_ERR_OR_NULL(opp) || !opp->available) { pr_err("%s: Invalid parameters\n", __func__); return 0; } return opp->rate; } EXPORT_SYMBOL_GPL(dev_pm_opp_get_freq); /** * dev_pm_opp_get_level() - Gets the level corresponding to an available opp * @opp: opp for which level value has to be returned for * * Return: level read from device tree corresponding to the opp, else * return 0. */ unsigned int dev_pm_opp_get_level(struct dev_pm_opp *opp) { if (IS_ERR_OR_NULL(opp) || !opp->available) { pr_err("%s: Invalid parameters\n", __func__); return 0; } return opp->level; } EXPORT_SYMBOL_GPL(dev_pm_opp_get_level); /** * dev_pm_opp_is_turbo() - Returns if opp is turbo OPP or not * @opp: opp for which turbo mode is being verified * * Turbo OPPs are not for normal use, and can be enabled (under certain * conditions) for short duration of times to finish high throughput work * quickly. Running on them for longer times may overheat the chip. * * Return: true if opp is turbo opp, else false. */ bool dev_pm_opp_is_turbo(struct dev_pm_opp *opp) { if (IS_ERR_OR_NULL(opp) || !opp->available) { pr_err("%s: Invalid parameters\n", __func__); return false; } return opp->turbo; } EXPORT_SYMBOL_GPL(dev_pm_opp_is_turbo); /** * dev_pm_opp_get_max_clock_latency() - Get max clock latency in nanoseconds * @dev: device for which we do this operation * * Return: This function returns the max clock latency in nanoseconds. */ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) { struct opp_table *opp_table; unsigned long clock_latency_ns; opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return 0; clock_latency_ns = opp_table->clock_latency_ns_max; dev_pm_opp_put_opp_table(opp_table); return clock_latency_ns; } EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency); /** * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds * @dev: device for which we do this operation * * Return: This function returns the max voltage latency in nanoseconds. */ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) { struct opp_table *opp_table; struct dev_pm_opp *opp; struct regulator *reg; unsigned long latency_ns = 0; int ret, i, count; struct { unsigned long min; unsigned long max; } *uV; opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return 0; /* Regulator may not be required for the device */ if (!opp_table->regulators) goto put_opp_table; count = opp_table->regulator_count; uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); if (!uV) goto put_opp_table; mutex_lock(&opp_table->lock); for (i = 0; i < count; i++) { uV[i].min = ~0; uV[i].max = 0; list_for_each_entry(opp, &opp_table->opp_list, node) { if (!opp->available) continue; if (opp->supplies[i].u_volt_min < uV[i].min) uV[i].min = opp->supplies[i].u_volt_min; if (opp->supplies[i].u_volt_max > uV[i].max) uV[i].max = opp->supplies[i].u_volt_max; } } mutex_unlock(&opp_table->lock); /* * The caller needs to ensure that opp_table (and hence the regulator) * isn't freed, while we are executing this routine. */ for (i = 0; i < count; i++) { reg = opp_table->regulators[i]; ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); if (ret > 0) latency_ns += ret * 1000; } kfree(uV); put_opp_table: dev_pm_opp_put_opp_table(opp_table); return latency_ns; } EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_volt_latency); /** * dev_pm_opp_get_max_transition_latency() - Get max transition latency in * nanoseconds * @dev: device for which we do this operation * * Return: This function returns the max transition latency, in nanoseconds, to * switch from one OPP to other. */ unsigned long dev_pm_opp_get_max_transition_latency(struct device *dev) { return dev_pm_opp_get_max_volt_latency(dev) + dev_pm_opp_get_max_clock_latency(dev); } EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_transition_latency); /** * dev_pm_opp_get_suspend_opp_freq() - Get frequency of suspend opp in Hz * @dev: device for which we do this operation * * Return: This function returns the frequency of the OPP marked as suspend_opp * if one is available, else returns 0; */ unsigned long dev_pm_opp_get_suspend_opp_freq(struct device *dev) { struct opp_table *opp_table; unsigned long freq = 0; opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return 0; if (opp_table->suspend_opp && opp_table->suspend_opp->available) freq = dev_pm_opp_get_freq(opp_table->suspend_opp); dev_pm_opp_put_opp_table(opp_table); return freq; } EXPORT_SYMBOL_GPL(dev_pm_opp_get_suspend_opp_freq); int _get_opp_count(struct opp_table *opp_table) { struct dev_pm_opp *opp; int count = 0; mutex_lock(&opp_table->lock); list_for_each_entry(opp, &opp_table->opp_list, node) { if (opp->available) count++; } mutex_unlock(&opp_table->lock); return count; } /** * dev_pm_opp_get_opp_count() - Get number of opps available in the opp table * @dev: device for which we do this operation * * Return: This function returns the number of available opps if there are any, * else returns 0 if none or the corresponding error value. */ int dev_pm_opp_get_opp_count(struct device *dev) { struct opp_table *opp_table; int count; opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) { count = PTR_ERR(opp_table); dev_dbg(dev, "%s: OPP table not found (%d)\n", __func__, count); return count; } count = _get_opp_count(opp_table); dev_pm_opp_put_opp_table(opp_table); return count; } EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_count); /** * dev_pm_opp_find_freq_exact() - search for an exact frequency * @dev: device for which we do this operation * @freq: frequency to search for * @available: true/false - match for available opp * * Return: Searches for exact match in the opp table and returns pointer to the * matching opp if found, else returns ERR_PTR in case of error and should * be handled using IS_ERR. Error return values can be: * EINVAL: for bad pointer * ERANGE: no match found for search * ENODEV: if device not found in list of registered devices * * Note: available is a modifier for the search. if available=true, then the * match is for exact matching frequency and is available in the stored OPP * table. if false, the match is for exact frequency which is not available. * * This provides a mechanism to enable an opp which is not available currently * or the opposite as well. * * The callers are required to call dev_pm_opp_put() for the returned OPP after * use. */ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, unsigned long freq, bool available) { struct opp_table *opp_table; struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) { int r = PTR_ERR(opp_table); dev_err(dev, "%s: OPP table not found (%d)\n", __func__, r); return ERR_PTR(r); } mutex_lock(&opp_table->lock); list_for_each_entry(temp_opp, &opp_table->opp_list, node) { if (temp_opp->available == available && temp_opp->rate == freq) { opp = temp_opp; /* Increment the reference count of OPP */ dev_pm_opp_get(opp); break; } } mutex_unlock(&opp_table->lock); dev_pm_opp_put_opp_table(opp_table); return opp; } EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, unsigned long *freq) { struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); mutex_lock(&opp_table->lock); list_for_each_entry(temp_opp, &opp_table->opp_list, node) { if (temp_opp->available && temp_opp->rate >= *freq) { opp = temp_opp; *freq = opp->rate; /* Increment the reference count of OPP */ dev_pm_opp_get(opp); break; } } mutex_unlock(&opp_table->lock); return opp; } /** * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq * @dev: device for which we do this operation * @freq: Start frequency * * Search for the matching ceil *available* OPP from a starting freq * for a device. * * Return: matching *opp and refreshes *freq accordingly, else returns * ERR_PTR in case of error and should be handled using IS_ERR. Error return * values can be: * EINVAL: for bad pointer * ERANGE: no match found for search * ENODEV: if device not found in list of registered devices * * The callers are required to call dev_pm_opp_put() for the returned OPP after * use. */ struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, unsigned long *freq) { struct opp_table *opp_table; struct dev_pm_opp *opp; if (!dev || !freq) { dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); return ERR_PTR(-EINVAL); } opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return ERR_CAST(opp_table); opp = _find_freq_ceil(opp_table, freq); dev_pm_opp_put_opp_table(opp_table); return opp; } EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); /** * dev_pm_opp_find_freq_floor() - Search for a rounded floor freq * @dev: device for which we do this operation * @freq: Start frequency * * Search for the matching floor *available* OPP from a starting freq * for a device. * * Return: matching *opp and refreshes *freq accordingly, else returns * ERR_PTR in case of error and should be handled using IS_ERR. Error return * values can be: * EINVAL: for bad pointer * ERANGE: no match found for search * ENODEV: if device not found in list of registered devices * * The callers are required to call dev_pm_opp_put() for the returned OPP after * use. */ struct dev_pm_opp *dev_pm_opp_find_freq_floor(struct device *dev, unsigned long *freq) { struct opp_table *opp_table; struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); if (!dev || !freq) { dev_err(dev, "%s: Invalid argument freq=%p\n", __func__, freq); return ERR_PTR(-EINVAL); } opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return ERR_CAST(opp_table); mutex_lock(&opp_table->lock); list_for_each_entry(temp_opp, &opp_table->opp_list, node) { if (temp_opp->available) { /* go to the next node, before choosing prev */ if (temp_opp->rate > *freq) break; else opp = temp_opp; } } /* Increment the reference count of OPP */ if (!IS_ERR(opp)) dev_pm_opp_get(opp); mutex_unlock(&opp_table->lock); dev_pm_opp_put_opp_table(opp_table); if (!IS_ERR(opp)) *freq = opp->rate; return opp; } EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_floor); /** * dev_pm_opp_find_freq_ceil_by_volt() - Find OPP with highest frequency for * target voltage. * @dev: Device for which we do this operation. * @u_volt: Target voltage. * * Search for OPP with highest (ceil) frequency and has voltage <= u_volt. * * Return: matching *opp, else returns ERR_PTR in case of error which should be * handled using IS_ERR. * * Error return values can be: * EINVAL: bad parameters * * The callers are required to call dev_pm_opp_put() for the returned OPP after * use. */ struct dev_pm_opp *dev_pm_opp_find_freq_ceil_by_volt(struct device *dev, unsigned long u_volt) { struct opp_table *opp_table; struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); if (!dev || !u_volt) { dev_err(dev, "%s: Invalid argument volt=%lu\n", __func__, u_volt); return ERR_PTR(-EINVAL); } opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return ERR_CAST(opp_table); mutex_lock(&opp_table->lock); list_for_each_entry(temp_opp, &opp_table->opp_list, node) { if (temp_opp->available) { if (temp_opp->supplies[0].u_volt > u_volt) break; opp = temp_opp; } } /* Increment the reference count of OPP */ if (!IS_ERR(opp)) dev_pm_opp_get(opp); mutex_unlock(&opp_table->lock); dev_pm_opp_put_opp_table(opp_table); return opp; } EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil_by_volt); static int _set_opp_voltage(struct device *dev, struct regulator *reg, struct dev_pm_opp_supply *supply) { int ret; /* Regulator not available for device */ if (IS_ERR(reg)) { dev_dbg(dev, "%s: regulator not available: %ld\n", __func__, PTR_ERR(reg)); return 0; } dev_dbg(dev, "%s: voltages (mV): %lu %lu %lu\n", __func__, supply->u_volt_min, supply->u_volt, supply->u_volt_max); ret = regulator_set_voltage_triplet(reg, supply->u_volt_min, supply->u_volt, supply->u_volt_max); if (ret) dev_err(dev, "%s: failed to set voltage (%lu %lu %lu mV): %d\n", __func__, supply->u_volt_min, supply->u_volt, supply->u_volt_max, ret); return ret; } static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk, unsigned long freq) { int ret; ret = clk_set_rate(clk, freq); if (ret) { dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, ret); } return ret; } static int _generic_set_opp_regulator(const struct opp_table *opp_table, struct device *dev, unsigned long old_freq, unsigned long freq, struct dev_pm_opp_supply *old_supply, struct dev_pm_opp_supply *new_supply) { struct regulator *reg = opp_table->regulators[0]; int ret; /* This function only supports single regulator per device */ if (WARN_ON(opp_table->regulator_count > 1)) { dev_err(dev, "multiple regulators are not supported\n"); return -EINVAL; } /* Scaling up? Scale voltage before frequency */ if (freq >= old_freq) { ret = _set_opp_voltage(dev, reg, new_supply); if (ret) goto restore_voltage; } /* Change frequency */ ret = _generic_set_opp_clk_only(dev, opp_table->clk, freq); if (ret) goto restore_voltage; /* Scaling down? Scale voltage after frequency */ if (freq < old_freq) { ret = _set_opp_voltage(dev, reg, new_supply); if (ret) goto restore_freq; } return 0; restore_freq: if (_generic_set_opp_clk_only(dev, opp_table->clk, old_freq)) dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", __func__, old_freq); restore_voltage: /* This shouldn't harm even if the voltages weren't updated earlier */ if (old_supply) _set_opp_voltage(dev, reg, old_supply); return ret; } static int _set_opp_custom(const struct opp_table *opp_table, struct device *dev, unsigned long old_freq, unsigned long freq, struct dev_pm_opp_supply *old_supply, struct dev_pm_opp_supply *new_supply) { struct dev_pm_set_opp_data *data; int size; data = opp_table->set_opp_data; data->regulators = opp_table->regulators; data->regulator_count = opp_table->regulator_count; data->clk = opp_table->clk; data->dev = dev; data->old_opp.rate = old_freq; size = sizeof(*old_supply) * opp_table->regulator_count; if (IS_ERR(old_supply)) memset(data->old_opp.supplies, 0, size); else memcpy(data->old_opp.supplies, old_supply, size); data->new_opp.rate = freq; memcpy(data->new_opp.supplies, new_supply, size); return opp_table->set_opp(data); } /* This is only called for PM domain for now */ static int _set_required_opps(struct device *dev, struct opp_table *opp_table, struct dev_pm_opp *opp) { struct opp_table **required_opp_tables = opp_table->required_opp_tables; struct device **genpd_virt_devs = opp_table->genpd_virt_devs; unsigned int pstate; int i, ret = 0; if (!required_opp_tables) return 0; /* Single genpd case */ if (!genpd_virt_devs) { pstate = opp->required_opps[0]->pstate; ret = dev_pm_genpd_set_performance_state(dev, pstate); if (ret) { dev_err(dev, "Failed to set performance state of %s: %d (%d)\n", dev_name(dev), pstate, ret); } return ret; } /* Multiple genpd case */ /* * Acquire genpd_virt_dev_lock to make sure we don't use a genpd_dev * after it is freed from another thread. */ mutex_lock(&opp_table->genpd_virt_dev_lock); for (i = 0; i < opp_table->required_opp_count; i++) { pstate = opp->required_opps[i]->pstate; if (!genpd_virt_devs[i]) continue; ret = dev_pm_genpd_set_performance_state(genpd_virt_devs[i], pstate); if (ret) { dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n", dev_name(genpd_virt_devs[i]), pstate, ret); break; } } mutex_unlock(&opp_table->genpd_virt_dev_lock); return ret; } /** * dev_pm_opp_set_rate() - Configure new OPP based on frequency * @dev: device for which we do this operation * @target_freq: frequency to achieve * * This configures the power-supplies and clock source to the levels specified * by the OPP corresponding to the target_freq. */ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) { struct opp_table *opp_table; unsigned long freq, old_freq; struct dev_pm_opp *old_opp, *opp; struct clk *clk; int ret; if (unlikely(!target_freq)) { dev_err(dev, "%s: Invalid target frequency %lu\n", __func__, target_freq); return -EINVAL; } opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) { dev_err(dev, "%s: device opp doesn't exist\n", __func__); return PTR_ERR(opp_table); } clk = opp_table->clk; if (IS_ERR(clk)) { dev_err(dev, "%s: No clock available for the device\n", __func__); ret = PTR_ERR(clk); goto put_opp_table; } freq = clk_round_rate(clk, target_freq); if ((long)freq <= 0) freq = target_freq; old_freq = clk_get_rate(clk); /* Return early if nothing to do */ if (old_freq == freq) { dev_dbg(dev, "%s: old/new frequencies (%lu Hz) are same, nothing to do\n", __func__, freq); ret = 0; goto put_opp_table; } old_opp = _find_freq_ceil(opp_table, &old_freq); if (IS_ERR(old_opp)) { dev_err(dev, "%s: failed to find current OPP for freq %lu (%ld)\n", __func__, old_freq, PTR_ERR(old_opp)); } opp = _find_freq_ceil(opp_table, &freq); if (IS_ERR(opp)) { ret = PTR_ERR(opp); dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", __func__, freq, ret); goto put_old_opp; } dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", __func__, old_freq, freq); /* Scaling up? Configure required OPPs before frequency */ if (freq >= old_freq) { ret = _set_required_opps(dev, opp_table, opp); if (ret) goto put_opp; } if (opp_table->set_opp) { ret = _set_opp_custom(opp_table, dev, old_freq, freq, IS_ERR(old_opp) ? NULL : old_opp->supplies, opp->supplies); } else if (opp_table->regulators) { ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq, IS_ERR(old_opp) ? NULL : old_opp->supplies, opp->supplies); } else { /* Only frequency scaling */ ret = _generic_set_opp_clk_only(dev, clk, freq); } /* Scaling down? Configure required OPPs after frequency */ if (!ret && freq < old_freq) { ret = _set_required_opps(dev, opp_table, opp); if (ret) dev_err(dev, "Failed to set required opps: %d\n", ret); } put_opp: dev_pm_opp_put(opp); put_old_opp: if (!IS_ERR(old_opp)) dev_pm_opp_put(old_opp); put_opp_table: dev_pm_opp_put_opp_table(opp_table); return ret; } EXPORT_SYMBOL_GPL(dev_pm_opp_set_rate); /* OPP-dev Helpers */ static void _remove_opp_dev(struct opp_device *opp_dev, struct opp_table *opp_table) { opp_debug_unregister(opp_dev, opp_table); list_del(&opp_dev->node); kfree(opp_dev); } static struct opp_device *_add_opp_dev_unlocked(const struct device *dev, struct opp_table *opp_table) { struct opp_device *opp_dev; opp_dev = kzalloc(sizeof(*opp_dev), GFP_KERNEL); if (!opp_dev) return NULL; /* Initialize opp-dev */ opp_dev->dev = dev; list_add(&opp_dev->node, &opp_table->dev_list); /* Create debugfs entries for the opp_table */ opp_debug_register(opp_dev, opp_table); return opp_dev; } struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table) { struct opp_device *opp_dev; mutex_lock(&opp_table->lock); opp_dev = _add_opp_dev_unlocked(dev, opp_table); mutex_unlock(&opp_table->lock); return opp_dev; } static struct opp_table *_allocate_opp_table(struct device *dev, int index) { struct opp_table *opp_table; struct opp_device *opp_dev; int ret; /* * Allocate a new OPP table. In the infrequent case where a new * device is needed to be added, we pay this penalty. */ opp_table = kzalloc(sizeof(*opp_table), GFP_KERNEL); if (!opp_table) return NULL; mutex_init(&opp_table->lock); mutex_init(&opp_table->genpd_virt_dev_lock); INIT_LIST_HEAD(&opp_table->dev_list); /* Mark regulator count uninitialized */ opp_table->regulator_count = -1; opp_dev = _add_opp_dev(dev, opp_table); if (!opp_dev) { kfree(opp_table); return NULL; } _of_init_opp_table(opp_table, dev, index); /* Find clk for the device */ opp_table->clk = clk_get(dev, NULL); if (IS_ERR(opp_table->clk)) { ret = PTR_ERR(opp_table->clk); if (ret != -EPROBE_DEFER) dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret); } BLOCKING_INIT_NOTIFIER_HEAD(&opp_table->head); INIT_LIST_HEAD(&opp_table->opp_list); kref_init(&opp_table->kref); /* Secure the device table modification */ list_add(&opp_table->node, &opp_tables); return opp_table; } void _get_opp_table_kref(struct opp_table *opp_table) { kref_get(&opp_table->kref); } static struct opp_table *_opp_get_opp_table(struct device *dev, int index) { struct opp_table *opp_table; /* Hold our table modification lock here */ mutex_lock(&opp_table_lock); opp_table = _find_opp_table_unlocked(dev); if (!IS_ERR(opp_table)) goto unlock; opp_table = _managed_opp(dev, index); if (opp_table) { if (!_add_opp_dev_unlocked(dev, opp_table)) { dev_pm_opp_put_opp_table(opp_table); opp_table = NULL; } goto unlock; } opp_table = _allocate_opp_table(dev, index); unlock: mutex_unlock(&opp_table_lock); return opp_table; } struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) { return _opp_get_opp_table(dev, 0); } EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table); struct opp_table *dev_pm_opp_get_opp_table_indexed(struct device *dev, int index) { return _opp_get_opp_table(dev, index); } static void _opp_table_kref_release(struct kref *kref) { struct opp_table *opp_table = container_of(kref, struct opp_table, kref); struct opp_device *opp_dev, *temp; _of_clear_opp_table(opp_table); /* Release clk */ if (!IS_ERR(opp_table->clk)) clk_put(opp_table->clk); WARN_ON(!list_empty(&opp_table->opp_list)); list_for_each_entry_safe(opp_dev, temp, &opp_table->dev_list, node) { /* * The OPP table is getting removed, drop the performance state * constraints. */ if (opp_table->genpd_performance_state) dev_pm_genpd_set_performance_state((struct device *)(opp_dev->dev), 0); _remove_opp_dev(opp_dev, opp_table); } mutex_destroy(&opp_table->genpd_virt_dev_lock); mutex_destroy(&opp_table->lock); list_del(&opp_table->node); kfree(opp_table); mutex_unlock(&opp_table_lock); } void _opp_remove_all_static(struct opp_table *opp_table) { struct dev_pm_opp *opp, *tmp; list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { if (!opp->dynamic) dev_pm_opp_put(opp); } opp_table->parsed_static_opps = false; } static void _opp_table_list_kref_release(struct kref *kref) { struct opp_table *opp_table = container_of(kref, struct opp_table, list_kref); _opp_remove_all_static(opp_table); mutex_unlock(&opp_table_lock); } void _put_opp_list_kref(struct opp_table *opp_table) { kref_put_mutex(&opp_table->list_kref, _opp_table_list_kref_release, &opp_table_lock); } void dev_pm_opp_put_opp_table(struct opp_table *opp_table) { kref_put_mutex(&opp_table->kref, _opp_table_kref_release, &opp_table_lock); } EXPORT_SYMBOL_GPL(dev_pm_opp_put_opp_table); void _opp_free(struct dev_pm_opp *opp) { kfree(opp); } static void _opp_kref_release(struct dev_pm_opp *opp, struct opp_table *opp_table) { /* * Notify the changes in the availability of the operable * frequency/voltage list. */ blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_REMOVE, opp); _of_opp_free_required_opps(opp_table, opp); opp_debug_remove_one(opp); list_del(&opp->node); kfree(opp); } static void _opp_kref_release_unlocked(struct kref *kref) { struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); struct opp_table *opp_table = opp->opp_table; _opp_kref_release(opp, opp_table); } static void _opp_kref_release_locked(struct kref *kref) { struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); struct opp_table *opp_table = opp->opp_table; _opp_kref_release(opp, opp_table); mutex_unlock(&opp_table->lock); } void dev_pm_opp_get(struct dev_pm_opp *opp) { kref_get(&opp->kref); } void dev_pm_opp_put(struct dev_pm_opp *opp) { kref_put_mutex(&opp->kref, _opp_kref_release_locked, &opp->opp_table->lock); } EXPORT_SYMBOL_GPL(dev_pm_opp_put); static void dev_pm_opp_put_unlocked(struct dev_pm_opp *opp) { kref_put(&opp->kref, _opp_kref_release_unlocked); } /** * dev_pm_opp_remove() - Remove an OPP from OPP table * @dev: device for which we do this operation * @freq: OPP to remove with matching 'freq' * * This function removes an opp from the opp table. */ void dev_pm_opp_remove(struct device *dev, unsigned long freq) { struct dev_pm_opp *opp; struct opp_table *opp_table; bool found = false; opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return; mutex_lock(&opp_table->lock); list_for_each_entry(opp, &opp_table->opp_list, node) { if (opp->rate == freq) { found = true; break; } } mutex_unlock(&opp_table->lock); if (found) { dev_pm_opp_put(opp); /* Drop the reference taken by dev_pm_opp_add() */ dev_pm_opp_put_opp_table(opp_table); } else { dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", __func__, freq); } /* Drop the reference taken by _find_opp_table() */ dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_remove); /** * dev_pm_opp_remove_all_dynamic() - Remove all dynamically created OPPs * @dev: device for which we do this operation * * This function removes all dynamically created OPPs from the opp table. */ void dev_pm_opp_remove_all_dynamic(struct device *dev) { struct opp_table *opp_table; struct dev_pm_opp *opp, *temp; int count = 0; opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return; mutex_lock(&opp_table->lock); list_for_each_entry_safe(opp, temp, &opp_table->opp_list, node) { if (opp->dynamic) { dev_pm_opp_put_unlocked(opp); count++; } } mutex_unlock(&opp_table->lock); /* Drop the references taken by dev_pm_opp_add() */ while (count--) dev_pm_opp_put_opp_table(opp_table); /* Drop the reference taken by _find_opp_table() */ dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_remove_all_dynamic); struct dev_pm_opp *_opp_allocate(struct opp_table *table) { struct dev_pm_opp *opp; int count, supply_size; /* Allocate space for at least one supply */ count = table->regulator_count > 0 ? table->regulator_count : 1; supply_size = sizeof(*opp->supplies) * count; /* allocate new OPP node and supplies structures */ opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL); if (!opp) return NULL; /* Put the supplies at the end of the OPP structure as an empty array */ opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); INIT_LIST_HEAD(&opp->node); return opp; } static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, struct opp_table *opp_table) { struct regulator *reg; int i; if (!opp_table->regulators) return true; for (i = 0; i < opp_table->regulator_count; i++) { reg = opp_table->regulators[i]; if (!regulator_is_supported_voltage(reg, opp->supplies[i].u_volt_min, opp->supplies[i].u_volt_max)) { pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", __func__, opp->supplies[i].u_volt_min, opp->supplies[i].u_volt_max); return false; } } return true; } static int _opp_is_duplicate(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, struct list_head **head) { struct dev_pm_opp *opp; /* * Insert new OPP in order of increasing frequency and discard if * already present. * * Need to use &opp_table->opp_list in the condition part of the 'for' * loop, don't replace it with head otherwise it will become an infinite * loop. */ list_for_each_entry(opp, &opp_table->opp_list, node) { if (new_opp->rate > opp->rate) { *head = &opp->node; continue; } if (new_opp->rate < opp->rate) return 0; /* Duplicate OPPs */ dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", __func__, opp->rate, opp->supplies[0].u_volt, opp->available, new_opp->rate, new_opp->supplies[0].u_volt, new_opp->available); /* Should we compare voltages for all regulators here ? */ return opp->available && new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? -EBUSY : -EEXIST; } return 0; } /* * Returns: * 0: On success. And appropriate error message for duplicate OPPs. * -EBUSY: For OPP with same freq/volt and is available. The callers of * _opp_add() must return 0 if they receive -EBUSY from it. This is to make * sure we don't print error messages unnecessarily if different parts of * kernel try to initialize the OPP table. * -EEXIST: For OPP with same freq but different volt or is unavailable. This * should be considered an error by the callers of _opp_add(). */ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available) { struct list_head *head; int ret; mutex_lock(&opp_table->lock); head = &opp_table->opp_list; if (likely(!rate_not_available)) { ret = _opp_is_duplicate(dev, new_opp, opp_table, &head); if (ret) { mutex_unlock(&opp_table->lock); return ret; } } list_add(&new_opp->node, head); mutex_unlock(&opp_table->lock); new_opp->opp_table = opp_table; kref_init(&new_opp->kref); opp_debug_create_one(new_opp, opp_table); if (!_opp_supported_by_regulators(new_opp, opp_table)) { new_opp->available = false; dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n", __func__, new_opp->rate); } return 0; } /** * _opp_add_v1() - Allocate a OPP based on v1 bindings. * @opp_table: OPP table * @dev: device for which we do this operation * @freq: Frequency in Hz for this OPP * @u_volt: Voltage in uVolts for this OPP * @dynamic: Dynamically added OPPs. * * This function adds an opp definition to the opp table and returns status. * The opp is made available by default and it can be controlled using * dev_pm_opp_enable/disable functions and may be removed by dev_pm_opp_remove. * * NOTE: "dynamic" parameter impacts OPPs added by the dev_pm_opp_of_add_table * and freed by dev_pm_opp_of_remove_table. * * Return: * 0 On success OR * Duplicate OPPs (both freq and volt are same) and opp->available * -EEXIST Freq are same and volt are different OR * Duplicate OPPs (both freq and volt are same) and !opp->available * -ENOMEM Memory allocation failure */ int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic) { struct dev_pm_opp *new_opp; unsigned long tol; int ret; new_opp = _opp_allocate(opp_table); if (!new_opp) return -ENOMEM; /* populate the opp table */ new_opp->rate = freq; tol = u_volt * opp_table->voltage_tolerance_v1 / 100; new_opp->supplies[0].u_volt = u_volt; new_opp->supplies[0].u_volt_min = u_volt - tol; new_opp->supplies[0].u_volt_max = u_volt + tol; new_opp->available = true; new_opp->dynamic = dynamic; ret = _opp_add(dev, new_opp, opp_table, false); if (ret) { /* Don't return error for duplicate OPPs */ if (ret == -EBUSY) ret = 0; goto free_opp; } /* * Notify the changes in the availability of the operable * frequency/voltage list. */ blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp); return 0; free_opp: _opp_free(new_opp); return ret; } /** * dev_pm_opp_set_supported_hw() - Set supported platforms * @dev: Device for which supported-hw has to be set. * @versions: Array of hierarchy of versions to match. * @count: Number of elements in the array. * * This is required only for the V2 bindings, and it enables a platform to * specify the hierarchy of versions it supports. OPP layer will then enable * OPPs, which are available for those versions, based on its 'opp-supported-hw' * property. */ struct opp_table *dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, unsigned int count) { struct opp_table *opp_table; opp_table = dev_pm_opp_get_opp_table(dev); if (!opp_table) return ERR_PTR(-ENOMEM); /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); /* Another CPU that shares the OPP table has set the property ? */ if (opp_table->supported_hw) return opp_table; opp_table->supported_hw = kmemdup(versions, count * sizeof(*versions), GFP_KERNEL); if (!opp_table->supported_hw) { dev_pm_opp_put_opp_table(opp_table); return ERR_PTR(-ENOMEM); } opp_table->supported_hw_count = count; return opp_table; } EXPORT_SYMBOL_GPL(dev_pm_opp_set_supported_hw); /** * dev_pm_opp_put_supported_hw() - Releases resources blocked for supported hw * @opp_table: OPP table returned by dev_pm_opp_set_supported_hw(). * * This is required only for the V2 bindings, and is called for a matching * dev_pm_opp_set_supported_hw(). Until this is called, the opp_table structure * will not be freed. */ void dev_pm_opp_put_supported_hw(struct opp_table *opp_table) { /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); kfree(opp_table->supported_hw); opp_table->supported_hw = NULL; opp_table->supported_hw_count = 0; dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_put_supported_hw); /** * dev_pm_opp_set_prop_name() - Set prop-extn name * @dev: Device for which the prop-name has to be set. * @name: name to postfix to properties. * * This is required only for the V2 bindings, and it enables a platform to * specify the extn to be used for certain property names. The properties to * which the extension will apply are opp-microvolt and opp-microamp. OPP core * should postfix the property name with -<name> while looking for them. */ struct opp_table *dev_pm_opp_set_prop_name(struct device *dev, const char *name) { struct opp_table *opp_table; opp_table = dev_pm_opp_get_opp_table(dev); if (!opp_table) return ERR_PTR(-ENOMEM); /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); /* Another CPU that shares the OPP table has set the property ? */ if (opp_table->prop_name) return opp_table; opp_table->prop_name = kstrdup(name, GFP_KERNEL); if (!opp_table->prop_name) { dev_pm_opp_put_opp_table(opp_table); return ERR_PTR(-ENOMEM); } return opp_table; } EXPORT_SYMBOL_GPL(dev_pm_opp_set_prop_name); /** * dev_pm_opp_put_prop_name() - Releases resources blocked for prop-name * @opp_table: OPP table returned by dev_pm_opp_set_prop_name(). * * This is required only for the V2 bindings, and is called for a matching * dev_pm_opp_set_prop_name(). Until this is called, the opp_table structure * will not be freed. */ void dev_pm_opp_put_prop_name(struct opp_table *opp_table) { /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); kfree(opp_table->prop_name); opp_table->prop_name = NULL; dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); static int _allocate_set_opp_data(struct opp_table *opp_table) { struct dev_pm_set_opp_data *data; int len, count = opp_table->regulator_count; if (WARN_ON(!opp_table->regulators)) return -EINVAL; /* space for set_opp_data */ len = sizeof(*data); /* space for old_opp.supplies and new_opp.supplies */ len += 2 * sizeof(struct dev_pm_opp_supply) * count; data = kzalloc(len, GFP_KERNEL); if (!data) return -ENOMEM; data->old_opp.supplies = (void *)(data + 1); data->new_opp.supplies = data->old_opp.supplies + count; opp_table->set_opp_data = data; return 0; } static void _free_set_opp_data(struct opp_table *opp_table) { kfree(opp_table->set_opp_data); opp_table->set_opp_data = NULL; } /** * dev_pm_opp_set_regulators() - Set regulator names for the device * @dev: Device for which regulator name is being set. * @names: Array of pointers to the names of the regulator. * @count: Number of regulators. * * In order to support OPP switching, OPP layer needs to know the name of the * device's regulators, as the core would be required to switch voltages as * well. * * This must be called before any OPPs are initialized for the device. */ struct opp_table *dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count) { struct opp_table *opp_table; struct regulator *reg; int ret, i; opp_table = dev_pm_opp_get_opp_table(dev); if (!opp_table) return ERR_PTR(-ENOMEM); /* This should be called before OPPs are initialized */ if (WARN_ON(!list_empty(&opp_table->opp_list))) { ret = -EBUSY; goto err; } /* Another CPU that shares the OPP table has set the regulators ? */ if (opp_table->regulators) return opp_table; opp_table->regulators = kmalloc_array(count, sizeof(*opp_table->regulators), GFP_KERNEL); if (!opp_table->regulators) { ret = -ENOMEM; goto err; } for (i = 0; i < count; i++) { reg = regulator_get_optional(dev, names[i]); if (IS_ERR(reg)) { ret = PTR_ERR(reg); if (ret != -EPROBE_DEFER) dev_err(dev, "%s: no regulator (%s) found: %d\n", __func__, names[i], ret); goto free_regulators; } opp_table->regulators[i] = reg; } opp_table->regulator_count = count; /* Allocate block only once to pass to set_opp() routines */ ret = _allocate_set_opp_data(opp_table); if (ret) goto free_regulators; return opp_table; free_regulators: while (i != 0) regulator_put(opp_table->regulators[--i]); kfree(opp_table->regulators); opp_table->regulators = NULL; opp_table->regulator_count = -1; err: dev_pm_opp_put_opp_table(opp_table); return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators); /** * dev_pm_opp_put_regulators() - Releases resources blocked for regulator * @opp_table: OPP table returned from dev_pm_opp_set_regulators(). */ void dev_pm_opp_put_regulators(struct opp_table *opp_table) { int i; if (!opp_table->regulators) goto put_opp_table; /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); for (i = opp_table->regulator_count - 1; i >= 0; i--) regulator_put(opp_table->regulators[i]); _free_set_opp_data(opp_table); kfree(opp_table->regulators); opp_table->regulators = NULL; opp_table->regulator_count = -1; put_opp_table: dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators); /** * dev_pm_opp_set_clkname() - Set clk name for the device * @dev: Device for which clk name is being set. * @name: Clk name. * * In order to support OPP switching, OPP layer needs to get pointer to the * clock for the device. Simple cases work fine without using this routine (i.e. * by passing connection-id as NULL), but for a device with multiple clocks * available, the OPP core needs to know the exact name of the clk to use. * * This must be called before any OPPs are initialized for the device. */ struct opp_table *dev_pm_opp_set_clkname(struct device *dev, const char *name) { struct opp_table *opp_table; int ret; opp_table = dev_pm_opp_get_opp_table(dev); if (!opp_table) return ERR_PTR(-ENOMEM); /* This should be called before OPPs are initialized */ if (WARN_ON(!list_empty(&opp_table->opp_list))) { ret = -EBUSY; goto err; } /* Already have default clk set, free it */ if (!IS_ERR(opp_table->clk)) clk_put(opp_table->clk); /* Find clk for the device */ opp_table->clk = clk_get(dev, name); if (IS_ERR(opp_table->clk)) { ret = PTR_ERR(opp_table->clk); if (ret != -EPROBE_DEFER) { dev_err(dev, "%s: Couldn't find clock: %d\n", __func__, ret); } goto err; } return opp_table; err: dev_pm_opp_put_opp_table(opp_table); return ERR_PTR(ret); } EXPORT_SYMBOL_GPL(dev_pm_opp_set_clkname); /** * dev_pm_opp_put_clkname() - Releases resources blocked for clk. * @opp_table: OPP table returned from dev_pm_opp_set_clkname(). */ void dev_pm_opp_put_clkname(struct opp_table *opp_table) { /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); clk_put(opp_table->clk); opp_table->clk = ERR_PTR(-EINVAL); dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_put_clkname); /** * dev_pm_opp_register_set_opp_helper() - Register custom set OPP helper * @dev: Device for which the helper is getting registered. * @set_opp: Custom set OPP helper. * * This is useful to support complex platforms (like platforms with multiple * regulators per device), instead of the generic OPP set rate helper. * * This must be called before any OPPs are initialized for the device. */ struct opp_table *dev_pm_opp_register_set_opp_helper(struct device *dev, int (*set_opp)(struct dev_pm_set_opp_data *data)) { struct opp_table *opp_table; if (!set_opp) return ERR_PTR(-EINVAL); opp_table = dev_pm_opp_get_opp_table(dev); if (!opp_table) return ERR_PTR(-ENOMEM); /* This should be called before OPPs are initialized */ if (WARN_ON(!list_empty(&opp_table->opp_list))) { dev_pm_opp_put_opp_table(opp_table); return ERR_PTR(-EBUSY); } /* Another CPU that shares the OPP table has set the helper ? */ if (!opp_table->set_opp) opp_table->set_opp = set_opp; return opp_table; } EXPORT_SYMBOL_GPL(dev_pm_opp_register_set_opp_helper); /** * dev_pm_opp_unregister_set_opp_helper() - Releases resources blocked for * set_opp helper * @opp_table: OPP table returned from dev_pm_opp_register_set_opp_helper(). * * Release resources blocked for platform specific set_opp helper. */ void dev_pm_opp_unregister_set_opp_helper(struct opp_table *opp_table) { /* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list)); opp_table->set_opp = NULL; dev_pm_opp_put_opp_table(opp_table); } EXPORT_SYMBOL_GPL(dev_pm_opp_unregister_set_opp_helper); /** * dev_pm_opp_set_genpd_virt_dev - Set virtual genpd device for an index * @dev: Consumer device for which the genpd device is getting set. * @virt_dev: virtual genpd device. * @index: index. * * Multiple generic power domains for a device are supported with the help of * virtual genpd devices, which are created for each consumer device - genpd * pair. These are the device structures which are attached to the power domain * and are required by the OPP core to set the performance state of the genpd. * * This helper will normally be called by the consumer driver of the device * "dev", as only that has details of the genpd devices. * * This helper needs to be called once for each of those virtual devices, but * only if multiple domains are available for a device. Otherwise the original * device structure will be used instead by the OPP core. */ struct opp_table *dev_pm_opp_set_genpd_virt_dev(struct device *dev, struct device *virt_dev, int index) { struct opp_table *opp_table; opp_table = dev_pm_opp_get_opp_table(dev); if (!opp_table) return ERR_PTR(-ENOMEM); mutex_lock(&opp_table->genpd_virt_dev_lock); if (unlikely(!opp_table->genpd_virt_devs || index >= opp_table->required_opp_count || opp_table->genpd_virt_devs[index])) { dev_err(dev, "Invalid request to set required device\n"); dev_pm_opp_put_opp_table(opp_table); mutex_unlock(&opp_table->genpd_virt_dev_lock); return ERR_PTR(-EINVAL); } opp_table->genpd_virt_devs[index] = virt_dev; mutex_unlock(&opp_table->genpd_virt_dev_lock); return opp_table; } /** * dev_pm_opp_put_genpd_virt_dev() - Releases resources blocked for genpd device. * @opp_table: OPP table returned by dev_pm_opp_set_genpd_virt_dev(). * @virt_dev: virtual genpd device. * * This releases the resource previously acquired with a call to * dev_pm_opp_set_genpd_virt_dev(). The consumer driver shall call this helper * if it doesn't want OPP core to update performance state of a power domain * anymore. */ void dev_pm_opp_put_genpd_virt_dev(struct opp_table *opp_table, struct device *virt_dev) { int i; /* * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting * used in parallel. */ mutex_lock(&opp_table->genpd_virt_dev_lock); for (i = 0; i < opp_table->required_opp_count; i++) { if (opp_table->genpd_virt_devs[i] != virt_dev) continue; opp_table->genpd_virt_devs[i] = NULL; dev_pm_opp_put_opp_table(opp_table); /* Drop the vote */ dev_pm_genpd_set_performance_state(virt_dev, 0); break; } mutex_unlock(&opp_table->genpd_virt_dev_lock); if (unlikely(i == opp_table->required_opp_count)) dev_err(virt_dev, "Failed to find required device entry\n"); } /** * dev_pm_opp_xlate_performance_state() - Find required OPP's pstate for src_table. * @src_table: OPP table which has dst_table as one of its required OPP table. * @dst_table: Required OPP table of the src_table. * @pstate: Current performance state of the src_table. * * This Returns pstate of the OPP (present in @dst_table) pointed out by the * "required-opps" property of the OPP (present in @src_table) which has * performance state set to @pstate. * * Return: Zero or positive performance state on success, otherwise negative * value on errors. */ int dev_pm_opp_xlate_performance_state(struct opp_table *src_table, struct opp_table *dst_table, unsigned int pstate) { struct dev_pm_opp *opp; int dest_pstate = -EINVAL; int i; if (!pstate) return 0; /* * Normally the src_table will have the "required_opps" property set to * point to one of the OPPs in the dst_table, but in some cases the * genpd and its master have one to one mapping of performance states * and so none of them have the "required-opps" property set. Return the * pstate of the src_table as it is in such cases. */ if (!src_table->required_opp_count) return pstate; for (i = 0; i < src_table->required_opp_count; i++) { if (src_table->required_opp_tables[i]->np == dst_table->np) break; } if (unlikely(i == src_table->required_opp_count)) { pr_err("%s: Couldn't find matching OPP table (%p: %p)\n", __func__, src_table, dst_table); return -EINVAL; } mutex_lock(&src_table->lock); list_for_each_entry(opp, &src_table->opp_list, node) { if (opp->pstate == pstate) { dest_pstate = opp->required_opps[i]->pstate; goto unlock; } } pr_err("%s: Couldn't find matching OPP (%p: %p)\n", __func__, src_table, dst_table); unlock: mutex_unlock(&src_table->lock); return dest_pstate; } /** * dev_pm_opp_add() - Add an OPP table from a table definitions * @dev: device for which we do this operation * @freq: Frequency in Hz for this OPP * @u_volt: Voltage in uVolts for this OPP * * This function adds an opp definition to the opp table and returns status. * The opp is made available by default and it can be controlled using * dev_pm_opp_enable/disable functions. * * Return: * 0 On success OR * Duplicate OPPs (both freq and volt are same) and opp->available * -EEXIST Freq are same and volt are different OR * Duplicate OPPs (both freq and volt are same) and !opp->available * -ENOMEM Memory allocation failure */ int dev_pm_opp_add(struct device *dev, unsigned long freq, unsigned long u_volt) { struct opp_table *opp_table; int ret; opp_table = dev_pm_opp_get_opp_table(dev); if (!opp_table) return -ENOMEM; /* Fix regulator count for dynamic OPPs */ opp_table->regulator_count = 1; ret = _opp_add_v1(opp_table, dev, freq, u_volt, true); if (ret) dev_pm_opp_put_opp_table(opp_table); return ret; } EXPORT_SYMBOL_GPL(dev_pm_opp_add); /** * _opp_set_availability() - helper to set the availability of an opp * @dev: device for which we do this operation * @freq: OPP frequency to modify availability * @availability_req: availability status requested for this opp * * Set the availability of an OPP, opp_{enable,disable} share a common logic * which is isolated here. * * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the * copy operation, returns 0 if no modification was done OR modification was * successful. */ static int _opp_set_availability(struct device *dev, unsigned long freq, bool availability_req) { struct opp_table *opp_table; struct dev_pm_opp *tmp_opp, *opp = ERR_PTR(-ENODEV); int r = 0; /* Find the opp_table */ opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) { r = PTR_ERR(opp_table); dev_warn(dev, "%s: Device OPP not found (%d)\n", __func__, r); return r; } mutex_lock(&opp_table->lock); /* Do we have the frequency? */ list_for_each_entry(tmp_opp, &opp_table->opp_list, node) { if (tmp_opp->rate == freq) { opp = tmp_opp; break; } } if (IS_ERR(opp)) { r = PTR_ERR(opp); goto unlock; } /* Is update really needed? */ if (opp->available == availability_req) goto unlock; opp->available = availability_req; dev_pm_opp_get(opp); mutex_unlock(&opp_table->lock); /* Notify the change of the OPP availability */ if (availability_req) blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ENABLE, opp); else blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_DISABLE, opp); dev_pm_opp_put(opp); goto put_table; unlock: mutex_unlock(&opp_table->lock); put_table: dev_pm_opp_put_opp_table(opp_table); return r; } /** * dev_pm_opp_enable() - Enable a specific OPP * @dev: device for which we do this operation * @freq: OPP frequency to enable * * Enables a provided opp. If the operation is valid, this returns 0, else the * corresponding error value. It is meant to be used for users an OPP available * after being temporarily made unavailable with dev_pm_opp_disable. * * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the * copy operation, returns 0 if no modification was done OR modification was * successful. */ int dev_pm_opp_enable(struct device *dev, unsigned long freq) { return _opp_set_availability(dev, freq, true); } EXPORT_SYMBOL_GPL(dev_pm_opp_enable); /** * dev_pm_opp_disable() - Disable a specific OPP * @dev: device for which we do this operation * @freq: OPP frequency to disable * * Disables a provided opp. If the operation is valid, this returns * 0, else the corresponding error value. It is meant to be a temporary * control by users to make this OPP not available until the circumstances are * right to make it available again (with a call to dev_pm_opp_enable). * * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the * copy operation, returns 0 if no modification was done OR modification was * successful. */ int dev_pm_opp_disable(struct device *dev, unsigned long freq) { return _opp_set_availability(dev, freq, false); } EXPORT_SYMBOL_GPL(dev_pm_opp_disable); /** * dev_pm_opp_register_notifier() - Register OPP notifier for the device * @dev: Device for which notifier needs to be registered * @nb: Notifier block to be registered * * Return: 0 on success or a negative error value. */ int dev_pm_opp_register_notifier(struct device *dev, struct notifier_block *nb) { struct opp_table *opp_table; int ret; opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return PTR_ERR(opp_table); ret = blocking_notifier_chain_register(&opp_table->head, nb); dev_pm_opp_put_opp_table(opp_table); return ret; } EXPORT_SYMBOL(dev_pm_opp_register_notifier); /** * dev_pm_opp_unregister_notifier() - Unregister OPP notifier for the device * @dev: Device for which notifier needs to be unregistered * @nb: Notifier block to be unregistered * * Return: 0 on success or a negative error value. */ int dev_pm_opp_unregister_notifier(struct device *dev, struct notifier_block *nb) { struct opp_table *opp_table; int ret; opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) return PTR_ERR(opp_table); ret = blocking_notifier_chain_unregister(&opp_table->head, nb); dev_pm_opp_put_opp_table(opp_table); return ret; } EXPORT_SYMBOL(dev_pm_opp_unregister_notifier); void _dev_pm_opp_find_and_remove_table(struct device *dev) { struct opp_table *opp_table; /* Check for existing table for 'dev' */ opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) { int error = PTR_ERR(opp_table); if (error != -ENODEV) WARN(1, "%s: opp_table: %d\n", IS_ERR_OR_NULL(dev) ? "Invalid device" : dev_name(dev), error); return; } _put_opp_list_kref(opp_table); /* Drop reference taken by _find_opp_table() */ dev_pm_opp_put_opp_table(opp_table); /* Drop reference taken while the OPP table was added */ dev_pm_opp_put_opp_table(opp_table); } /** * dev_pm_opp_remove_table() - Free all OPPs associated with the device * @dev: device pointer used to lookup OPP table. * * Free both OPPs created using static entries present in DT and the * dynamically added entries. */ void dev_pm_opp_remove_table(struct device *dev) { _dev_pm_opp_find_and_remove_table(dev); } EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table);
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