| /* |
| * Generic OPP Interface |
| * |
| * Copyright (C) 2009-2010 Texas Instruments Incorporated. |
| * Nishanth Menon |
| * Romit Dasgupta |
| * Kevin Hilman |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #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; |
| |
| list_for_each_entry(opp_table, &opp_tables, node) { |
| if (_find_opp_dev(dev, opp_table)) { |
| _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_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); |
| |
| 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 old_freq, 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 inline int |
| _generic_set_opp_domain(struct device *dev, struct clk *clk, |
| unsigned long old_freq, unsigned long freq, |
| unsigned int old_pstate, unsigned int new_pstate) |
| { |
| int ret; |
| |
| /* Scaling up? Scale domain performance state before frequency */ |
| if (freq > old_freq) { |
| ret = dev_pm_genpd_set_performance_state(dev, new_pstate); |
| if (ret) |
| return ret; |
| } |
| |
| ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq); |
| if (ret) |
| goto restore_domain_state; |
| |
| /* Scaling down? Scale domain performance state after frequency */ |
| if (freq < old_freq) { |
| ret = dev_pm_genpd_set_performance_state(dev, new_pstate); |
| if (ret) |
| goto restore_freq; |
| } |
| |
| return 0; |
| |
| restore_freq: |
| if (_generic_set_opp_clk_only(dev, clk, freq, old_freq)) |
| dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n", |
| __func__, old_freq); |
| restore_domain_state: |
| if (freq > old_freq) |
| dev_pm_genpd_set_performance_state(dev, old_pstate); |
| |
| 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, old_freq, 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, freq, 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; |
| } |
| |
| /** |
| * 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, size; |
| |
| 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); |
| |
| /* Only frequency scaling */ |
| if (!opp_table->regulators) { |
| /* |
| * We don't support devices with both regulator and |
| * domain performance-state for now. |
| */ |
| if (opp_table->genpd_performance_state) |
| ret = _generic_set_opp_domain(dev, clk, old_freq, freq, |
| IS_ERR(old_opp) ? 0 : old_opp->pstate, |
| opp->pstate); |
| else |
| ret = _generic_set_opp_clk_only(dev, clk, old_freq, freq); |
| } else if (!opp_table->set_opp) { |
| ret = _generic_set_opp_regulator(opp_table, dev, old_freq, freq, |
| IS_ERR(old_opp) ? NULL : old_opp->supplies, |
| opp->supplies); |
| } else { |
| struct dev_pm_set_opp_data *data; |
| |
| data = opp_table->set_opp_data; |
| data->regulators = opp_table->regulators; |
| data->regulator_count = opp_table->regulator_count; |
| data->clk = clk; |
| data->dev = dev; |
| |
| data->old_opp.rate = old_freq; |
| size = sizeof(*opp->supplies) * opp_table->regulator_count; |
| if (IS_ERR(old_opp)) |
| memset(data->old_opp.supplies, 0, size); |
| else |
| memcpy(data->old_opp.supplies, old_opp->supplies, size); |
| |
| data->new_opp.rate = freq; |
| memcpy(data->new_opp.supplies, opp->supplies, size); |
| |
| ret = opp_table->set_opp(data); |
| } |
| |
| 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); |
| } |
| |
| struct opp_device *_add_opp_dev(const struct device *dev, |
| struct opp_table *opp_table) |
| { |
| struct opp_device *opp_dev; |
| int ret; |
| |
| 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 */ |
| ret = opp_debug_register(opp_dev, opp_table); |
| if (ret) |
| dev_err(dev, "%s: Failed to register opp debugfs (%d)\n", |
| __func__, ret); |
| |
| return opp_dev; |
| } |
| |
| static struct opp_table *_allocate_opp_table(struct device *dev) |
| { |
| 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; |
| |
| 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); |
| |
| /* 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); |
| mutex_init(&opp_table->lock); |
| 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); |
| } |
| |
| struct opp_table *dev_pm_opp_get_opp_table(struct device *dev) |
| { |
| 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 = _allocate_opp_table(dev); |
| |
| unlock: |
| mutex_unlock(&opp_table_lock); |
| |
| return opp_table; |
| } |
| EXPORT_SYMBOL_GPL(dev_pm_opp_get_opp_table); |
| |
| 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; |
| |
| /* Release clk */ |
| if (!IS_ERR(opp_table->clk)) |
| clk_put(opp_table->clk); |
| |
| opp_dev = list_first_entry(&opp_table->dev_list, struct opp_device, |
| node); |
| |
| _remove_opp_dev(opp_dev, opp_table); |
| |
| /* dev_list must be empty now */ |
| WARN_ON(!list_empty(&opp_table->dev_list)); |
| |
| mutex_destroy(&opp_table->lock); |
| list_del(&opp_table->node); |
| kfree(opp_table); |
| |
| mutex_unlock(&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 kref *kref) |
| { |
| struct dev_pm_opp *opp = container_of(kref, struct dev_pm_opp, kref); |
| struct opp_table *opp_table = opp->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); |
| opp_debug_remove_one(opp); |
| list_del(&opp->node); |
| kfree(opp); |
| |
| mutex_unlock(&opp_table->lock); |
| dev_pm_opp_put_opp_table(opp_table); |
| } |
| |
| 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, &opp->opp_table->lock); |
| } |
| EXPORT_SYMBOL_GPL(dev_pm_opp_put); |
| |
| /** |
| * 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); |
| } else { |
| dev_warn(dev, "%s: Couldn't find OPP with freq: %lu\n", |
| __func__, freq); |
| } |
| |
| dev_pm_opp_put_opp_table(opp_table); |
| } |
| EXPORT_SYMBOL_GPL(dev_pm_opp_remove); |
| |
| 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); |
| |
| /* Get a reference to the OPP table */ |
| _get_opp_table_kref(opp_table); |
| |
| ret = opp_debug_create_one(new_opp, opp_table); |
| if (ret) |
| dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n", |
| __func__, ret); |
| |
| 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_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); |
| |
| 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); |
| |
| /* |
| * Free OPPs either created using static entries present in DT or even the |
| * dynamically added entries based on remove_all param. |
| */ |
| void _dev_pm_opp_remove_table(struct opp_table *opp_table, struct device *dev, |
| bool remove_all) |
| { |
| struct dev_pm_opp *opp, *tmp; |
| |
| /* Find if opp_table manages a single device */ |
| if (list_is_singular(&opp_table->dev_list)) { |
| /* Free static OPPs */ |
| list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { |
| if (remove_all || !opp->dynamic) |
| dev_pm_opp_put(opp); |
| } |
| |
| /* |
| * The OPP table is getting removed, drop the performance state |
| * constraints. |
| */ |
| if (opp_table->genpd_performance_state) |
| dev_pm_genpd_set_performance_state(dev, 0); |
| } else { |
| _remove_opp_dev(_find_opp_dev(dev, opp_table), opp_table); |
| } |
| } |
| |
| void _dev_pm_opp_find_and_remove_table(struct device *dev, bool remove_all) |
| { |
| 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; |
| } |
| |
| _dev_pm_opp_remove_table(opp_table, dev, remove_all); |
| |
| 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, true); |
| } |
| EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); |