diff options
Diffstat (limited to 'drivers/opp')
| -rw-r--r-- | drivers/opp/Kconfig | 14 | ||||
| -rw-r--r-- | drivers/opp/Makefile | 6 | ||||
| -rw-r--r-- | drivers/opp/core.c | 2464 | ||||
| -rw-r--r-- | drivers/opp/cpu.c | 236 | ||||
| -rw-r--r-- | drivers/opp/debugfs.c | 249 | ||||
| -rw-r--r-- | drivers/opp/of.c | 1341 | ||||
| -rw-r--r-- | drivers/opp/opp.h | 262 | ||||
| -rw-r--r-- | drivers/opp/ti-opp-supply.c | 427 |
8 files changed, 4999 insertions, 0 deletions
diff --git a/drivers/opp/Kconfig b/drivers/opp/Kconfig new file mode 100644 index 000000000..e8ce47b32 --- /dev/null +++ b/drivers/opp/Kconfig @@ -0,0 +1,14 @@ +# SPDX-License-Identifier: GPL-2.0-only +config PM_OPP + bool + select SRCU + help + SOCs have a standard set of tuples consisting of frequency and + voltage pairs that the device will support per voltage domain. This + is called Operating Performance Point or OPP. The actual definitions + of OPP varies over silicon within the same family of devices. + + OPP layer organizes the data internally using device pointers + representing individual voltage domains and provides SOC + implementations a ready to use framework to manage OPPs. + For more information, read <file:Documentation/power/opp.rst> diff --git a/drivers/opp/Makefile b/drivers/opp/Makefile new file mode 100644 index 000000000..f65ed5985 --- /dev/null +++ b/drivers/opp/Makefile @@ -0,0 +1,6 @@ +# SPDX-License-Identifier: GPL-2.0-only +ccflags-$(CONFIG_DEBUG_DRIVER) := -DDEBUG +obj-y += core.o cpu.o +obj-$(CONFIG_OF) += of.o +obj-$(CONFIG_DEBUG_FS) += debugfs.o +obj-$(CONFIG_ARM_TI_CPUFREQ) += ti-opp-supply.o diff --git a/drivers/opp/core.c b/drivers/opp/core.c new file mode 100644 index 000000000..7999baa07 --- /dev/null +++ b/drivers/opp/core.c @@ -0,0 +1,2464 @@ +// 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)) { + 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); + +/** + * dev_pm_opp_find_level_exact() - search for an exact level + * @dev: device for which we do this operation + * @level: level to search for + * + * 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 + * + * The callers are required to call dev_pm_opp_put() for the returned OPP after + * use. + */ +struct dev_pm_opp *dev_pm_opp_find_level_exact(struct device *dev, + unsigned int level) +{ + 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->level == level) { + 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_level_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(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; + } + + /* + * Enable the regulator after setting its voltages, otherwise it breaks + * some boot-enabled regulators. + */ + if (unlikely(!opp_table->enabled)) { + ret = regulator_enable(reg); + if (ret < 0) + dev_warn(dev, "Failed to enable regulator: %d", ret); + } + + 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_bw(const struct opp_table *opp_table, + struct dev_pm_opp *opp, struct device *dev, bool remove) +{ + u32 avg, peak; + int i, ret; + + if (!opp_table->paths) + return 0; + + for (i = 0; i < opp_table->path_count; i++) { + if (remove) { + avg = 0; + peak = 0; + } else { + avg = opp->bandwidth[i].avg; + peak = opp->bandwidth[i].peak; + } + ret = icc_set_bw(opp_table->paths[i], avg, peak); + if (ret) { + dev_err(dev, "Failed to %s bandwidth[%d]: %d\n", + remove ? "remove" : "set", i, ret); + return ret; + } + } + + return 0; +} + +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 (!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); +} + +static int _set_required_opp(struct device *dev, struct device *pd_dev, + struct dev_pm_opp *opp, int i) +{ + unsigned int pstate = likely(opp) ? opp->required_opps[i]->pstate : 0; + int ret; + + if (!pd_dev) + return 0; + + ret = dev_pm_genpd_set_performance_state(pd_dev, pstate); + if (ret) { + dev_err(dev, "Failed to set performance rate of %s: %d (%d)\n", + dev_name(pd_dev), pstate, ret); + } + + return ret; +} + +/* 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, bool up) +{ + struct opp_table **required_opp_tables = opp_table->required_opp_tables; + struct device **genpd_virt_devs = opp_table->genpd_virt_devs; + int i, ret = 0; + + if (!required_opp_tables) + return 0; + + /* Single genpd case */ + if (!genpd_virt_devs) + return _set_required_opp(dev, dev, opp, 0); + + /* 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); + + /* Scaling up? Set required OPPs in normal order, else reverse */ + if (up) { + for (i = 0; i < opp_table->required_opp_count; i++) { + ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i); + if (ret) + break; + } + } else { + for (i = opp_table->required_opp_count - 1; i >= 0; i--) { + ret = _set_required_opp(dev, genpd_virt_devs[i], opp, i); + if (ret) + break; + } + } + + mutex_unlock(&opp_table->genpd_virt_dev_lock); + + return ret; +} + +/** + * dev_pm_opp_set_bw() - sets bandwidth levels corresponding to an opp + * @dev: device for which we do this operation + * @opp: opp based on which the bandwidth levels are to be configured + * + * This configures the bandwidth to the levels specified by the OPP. However + * if the OPP specified is NULL the bandwidth levels are cleared out. + * + * Return: 0 on success or a negative error value. + */ +int dev_pm_opp_set_bw(struct device *dev, struct dev_pm_opp *opp) +{ + struct opp_table *opp_table; + int ret; + + opp_table = _find_opp_table(dev); + if (IS_ERR(opp_table)) { + dev_err(dev, "%s: device opp table doesn't exist\n", __func__); + return PTR_ERR(opp_table); + } + + if (opp) + ret = _set_opp_bw(opp_table, opp, dev, false); + else + ret = _set_opp_bw(opp_table, NULL, dev, true); + + dev_pm_opp_put_opp_table(opp_table); + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_set_bw); + +static int _opp_set_rate_zero(struct device *dev, struct opp_table *opp_table) +{ + int ret; + + if (!opp_table->enabled) + return 0; + + /* + * Some drivers need to support cases where some platforms may + * have OPP table for the device, while others don't and + * opp_set_rate() just needs to behave like clk_set_rate(). + */ + if (!_get_opp_count(opp_table)) + return 0; + + ret = _set_opp_bw(opp_table, NULL, dev, true); + if (ret) + return ret; + + if (opp_table->regulators) + regulator_disable(opp_table->regulators[0]); + + ret = _set_required_opps(dev, opp_table, NULL, false); + + opp_table->enabled = false; + 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 to the levels specified by the OPP + * corresponding to the target_freq, and programs the clock to a value <= + * target_freq, as rounded by clk_round_rate(). Device wanting to run at fmax + * provided by the opp, should have already rounded to the target OPP's + * frequency. + */ +int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) +{ + struct opp_table *opp_table; + unsigned long freq, old_freq, temp_freq; + struct dev_pm_opp *old_opp, *opp; + struct clk *clk; + int ret; + + 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); + } + + if (unlikely(!target_freq)) { + ret = _opp_set_rate_zero(dev, opp_table); + goto put_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 (opp_table->enabled && 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; + } + + /* + * For IO devices which require an OPP on some platforms/SoCs + * while just needing to scale the clock on some others + * we look for empty OPP tables with just a clock handle and + * scale only the clk. This makes dev_pm_opp_set_rate() + * equivalent to a clk_set_rate() + */ + if (!_get_opp_count(opp_table)) { + ret = _generic_set_opp_clk_only(dev, clk, freq); + goto put_opp_table; + } + + temp_freq = old_freq; + old_opp = _find_freq_ceil(opp_table, &temp_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)); + } + + temp_freq = freq; + opp = _find_freq_ceil(opp_table, &temp_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, true); + 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, false); + if (ret) + dev_err(dev, "Failed to set required opps: %d\n", ret); + } + + if (!ret) { + ret = _set_opp_bw(opp_table, opp, dev, false); + if (!ret) + opp_table->enabled = true; + } + +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 ERR_PTR(-ENOMEM); + + 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) { + ret = -ENOMEM; + goto err; + } + + _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) + goto remove_opp_dev; + + dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret); + } + + /* Find interconnect path(s) for the device */ + ret = dev_pm_opp_of_find_icc_paths(dev, opp_table); + if (ret) { + if (ret == -EPROBE_DEFER) + goto put_clk; + + dev_warn(dev, "%s: Error finding interconnect paths: %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; + +put_clk: + if (!IS_ERR(opp_table->clk)) + clk_put(opp_table->clk); +remove_opp_dev: + _remove_opp_dev(opp_dev, opp_table); +err: + kfree(opp_table); + return ERR_PTR(ret); +} + +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 = ERR_PTR(-ENOMEM); + } + 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; + int i; + + /* Drop the lock as soon as we can */ + list_del(&opp_table->node); + mutex_unlock(&opp_table_lock); + + _of_clear_opp_table(opp_table); + + /* Release clk */ + if (!IS_ERR(opp_table->clk)) + clk_put(opp_table->clk); + + if (opp_table->paths) { + for (i = 0; i < opp_table->path_count; i++) + icc_put(opp_table->paths[i]); + kfree(opp_table->paths); + } + + 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); + kfree(opp_table); +} + +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); + +bool _opp_remove_all_static(struct opp_table *opp_table) +{ + struct dev_pm_opp *opp, *tmp; + bool ret = true; + + mutex_lock(&opp_table->lock); + + if (!opp_table->parsed_static_opps) { + ret = false; + goto unlock; + } + + if (--opp_table->parsed_static_opps) + goto unlock; + + list_for_each_entry_safe(opp, tmp, &opp_table->opp_list, node) { + if (!opp->dynamic) + dev_pm_opp_put_unlocked(opp); + } + +unlock: + mutex_unlock(&opp_table->lock); + + return ret; +} + +/** + * 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 supply_count, supply_size, icc_size; + + /* Allocate space for at least one supply */ + supply_count = table->regulator_count > 0 ? table->regulator_count : 1; + supply_size = sizeof(*opp->supplies) * supply_count; + icc_size = sizeof(*opp->bandwidth) * table->path_count; + + /* allocate new OPP node and supplies structures */ + opp = kzalloc(sizeof(*opp) + supply_size + icc_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); + if (icc_size) + opp->bandwidth = (struct dev_pm_opp_icc_bw *)(opp->supplies + supply_count); + 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; +} + +int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2) +{ + if (opp1->rate != opp2->rate) + return opp1->rate < opp2->rate ? -1 : 1; + if (opp1->bandwidth && opp2->bandwidth && + opp1->bandwidth[0].peak != opp2->bandwidth[0].peak) + return opp1->bandwidth[0].peak < opp2->bandwidth[0].peak ? -1 : 1; + if (opp1->level != opp2->level) + return opp1->level < opp2->level ? -1 : 1; + return 0; +} + +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; + int opp_cmp; + + /* + * 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) { + opp_cmp = _opp_compare_key(new_opp, opp); + if (opp_cmp > 0) { + *head = &opp->node; + continue; + } + + if (opp_cmp < 0) + 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 (IS_ERR(opp_table)) + return opp_table; + + /* 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 (IS_ERR(opp_table)) + return opp_table; + + /* 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 (IS_ERR(opp_table)) + return opp_table; + + /* 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)); + + if (opp_table->enabled) { + for (i = opp_table->regulator_count - 1; i >= 0; i--) + regulator_disable(opp_table->regulators[i]); + } + + 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 (IS_ERR(opp_table)) + return opp_table; + + /* 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 (IS_ERR(opp_table)) + return opp_table; + + /* 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); + +static void _opp_detach_genpd(struct opp_table *opp_table) +{ + int index; + + if (!opp_table->genpd_virt_devs) + return; + + for (index = 0; index < opp_table->required_opp_count; index++) { + if (!opp_table->genpd_virt_devs[index]) + continue; + + dev_pm_domain_detach(opp_table->genpd_virt_devs[index], false); + opp_table->genpd_virt_devs[index] = NULL; + } + + kfree(opp_table->genpd_virt_devs); + opp_table->genpd_virt_devs = NULL; +} + +/** + * dev_pm_opp_attach_genpd - Attach genpd(s) for the device and save virtual device pointer + * @dev: Consumer device for which the genpd is getting attached. + * @names: Null terminated array of pointers containing names of genpd to attach. + * @virt_devs: Pointer to return the array of virtual devices. + * + * 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. + * The same API also works for the case where single genpd is available and so + * we don't need to support that separately. + * + * This helper will normally be called by the consumer driver of the device + * "dev", as only that has details of the genpd names. + * + * This helper needs to be called once with a list of all genpd to attach. + * Otherwise the original device structure will be used instead by the OPP core. + * + * The order of entries in the names array must match the order in which + * "required-opps" are added in DT. + */ +struct opp_table *dev_pm_opp_attach_genpd(struct device *dev, + const char **names, struct device ***virt_devs) +{ + struct opp_table *opp_table; + struct device *virt_dev; + int index = 0, ret = -EINVAL; + const char **name = names; + + opp_table = dev_pm_opp_get_opp_table(dev); + if (IS_ERR(opp_table)) + return opp_table; + + if (opp_table->genpd_virt_devs) + return opp_table; + + /* + * If the genpd's OPP table isn't already initialized, parsing of the + * required-opps fail for dev. We should retry this after genpd's OPP + * table is added. + */ + if (!opp_table->required_opp_count) { + ret = -EPROBE_DEFER; + goto put_table; + } + + mutex_lock(&opp_table->genpd_virt_dev_lock); + + opp_table->genpd_virt_devs = kcalloc(opp_table->required_opp_count, + sizeof(*opp_table->genpd_virt_devs), + GFP_KERNEL); + if (!opp_table->genpd_virt_devs) + goto unlock; + + while (*name) { + if (index >= opp_table->required_opp_count) { + dev_err(dev, "Index can't be greater than required-opp-count - 1, %s (%d : %d)\n", + *name, opp_table->required_opp_count, index); + goto err; + } + + virt_dev = dev_pm_domain_attach_by_name(dev, *name); + if (IS_ERR_OR_NULL(virt_dev)) { + ret = virt_dev ? PTR_ERR(virt_dev) : -ENODEV; + dev_err(dev, "Couldn't attach to pm_domain: %d\n", ret); + goto err; + } + + opp_table->genpd_virt_devs[index] = virt_dev; + index++; + name++; + } + + if (virt_devs) + *virt_devs = opp_table->genpd_virt_devs; + mutex_unlock(&opp_table->genpd_virt_dev_lock); + + return opp_table; + +err: + _opp_detach_genpd(opp_table); +unlock: + mutex_unlock(&opp_table->genpd_virt_dev_lock); + +put_table: + dev_pm_opp_put_opp_table(opp_table); + + return ERR_PTR(ret); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_attach_genpd); + +/** + * dev_pm_opp_detach_genpd() - Detach genpd(s) from the device. + * @opp_table: OPP table returned by dev_pm_opp_attach_genpd(). + * + * This detaches the genpd(s), resets the virtual device pointers, and puts the + * OPP table. + */ +void dev_pm_opp_detach_genpd(struct opp_table *opp_table) +{ + /* + * Acquire genpd_virt_dev_lock to make sure virt_dev isn't getting + * used in parallel. + */ + mutex_lock(&opp_table->genpd_virt_dev_lock); + _opp_detach_genpd(opp_table); + mutex_unlock(&opp_table->genpd_virt_dev_lock); + + dev_pm_opp_put_opp_table(opp_table); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_detach_genpd); + +/** + * 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; + + /* + * 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 (IS_ERR(opp_table)) + return PTR_ERR(opp_table); + + /* 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_adjust_voltage() - helper to change the voltage of an OPP + * @dev: device for which we do this operation + * @freq: OPP frequency to adjust voltage of + * @u_volt: new OPP target voltage + * @u_volt_min: new OPP min voltage + * @u_volt_max: new OPP max voltage + * + * Return: -EINVAL for bad pointers, -ENOMEM if no memory available for the + * copy operation, returns 0 if no modifcation was done OR modification was + * successful. + */ +int dev_pm_opp_adjust_voltage(struct device *dev, unsigned long freq, + unsigned long u_volt, unsigned long u_volt_min, + unsigned long u_volt_max) + +{ + 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 adjust_unlock; + } + + /* Is update really needed? */ + if (opp->supplies->u_volt == u_volt) + goto adjust_unlock; + + opp->supplies->u_volt = u_volt; + opp->supplies->u_volt_min = u_volt_min; + opp->supplies->u_volt_max = u_volt_max; + + dev_pm_opp_get(opp); + mutex_unlock(&opp_table->lock); + + /* Notify the voltage change of the OPP */ + blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADJUST_VOLTAGE, + opp); + + dev_pm_opp_put(opp); + goto adjust_put_table; + +adjust_unlock: + mutex_unlock(&opp_table->lock); +adjust_put_table: + dev_pm_opp_put_opp_table(opp_table); + return r; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_adjust_voltage); + +/** + * 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); + +/** + * 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) +{ + 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; + } + + /* + * Drop the extra reference only if the OPP table was successfully added + * with dev_pm_opp_of_add_table() earlier. + **/ + if (_opp_remove_all_static(opp_table)) + dev_pm_opp_put_opp_table(opp_table); + + /* Drop reference taken by _find_opp_table() */ + dev_pm_opp_put_opp_table(opp_table); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_remove_table); diff --git a/drivers/opp/cpu.c b/drivers/opp/cpu.c new file mode 100644 index 000000000..5004335cf --- /dev/null +++ b/drivers/opp/cpu.c @@ -0,0 +1,236 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic OPP helper interface for CPU device + * + * Copyright (C) 2009-2014 Texas Instruments Incorporated. + * Nishanth Menon + * Romit Dasgupta + * Kevin Hilman + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/cpu.h> +#include <linux/cpufreq.h> +#include <linux/err.h> +#include <linux/errno.h> +#include <linux/export.h> +#include <linux/slab.h> + +#include "opp.h" + +#ifdef CONFIG_CPU_FREQ + +/** + * dev_pm_opp_init_cpufreq_table() - create a cpufreq table for a device + * @dev: device for which we do this operation + * @table: Cpufreq table returned back to caller + * + * Generate a cpufreq table for a provided device- this assumes that the + * opp table is already initialized and ready for usage. + * + * This function allocates required memory for the cpufreq table. It is + * expected that the caller does the required maintenance such as freeing + * the table as required. + * + * Returns -EINVAL for bad pointers, -ENODEV if the device is not found, -ENOMEM + * if no memory available for the operation (table is not populated), returns 0 + * if successful and table is populated. + * + * WARNING: It is important for the callers to ensure refreshing their copy of + * the table if any of the mentioned functions have been invoked in the interim. + */ +int dev_pm_opp_init_cpufreq_table(struct device *dev, + struct cpufreq_frequency_table **table) +{ + struct dev_pm_opp *opp; + struct cpufreq_frequency_table *freq_table = NULL; + int i, max_opps, ret = 0; + unsigned long rate; + + max_opps = dev_pm_opp_get_opp_count(dev); + if (max_opps <= 0) + return max_opps ? max_opps : -ENODATA; + + freq_table = kcalloc((max_opps + 1), sizeof(*freq_table), GFP_KERNEL); + if (!freq_table) + return -ENOMEM; + + for (i = 0, rate = 0; i < max_opps; i++, rate++) { + /* find next rate */ + opp = dev_pm_opp_find_freq_ceil(dev, &rate); + if (IS_ERR(opp)) { + ret = PTR_ERR(opp); + goto out; + } + freq_table[i].driver_data = i; + freq_table[i].frequency = rate / 1000; + + /* Is Boost/turbo opp ? */ + if (dev_pm_opp_is_turbo(opp)) + freq_table[i].flags = CPUFREQ_BOOST_FREQ; + + dev_pm_opp_put(opp); + } + + freq_table[i].driver_data = i; + freq_table[i].frequency = CPUFREQ_TABLE_END; + + *table = &freq_table[0]; + +out: + if (ret) + kfree(freq_table); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_init_cpufreq_table); + +/** + * dev_pm_opp_free_cpufreq_table() - free the cpufreq table + * @dev: device for which we do this operation + * @table: table to free + * + * Free up the table allocated by dev_pm_opp_init_cpufreq_table + */ +void dev_pm_opp_free_cpufreq_table(struct device *dev, + struct cpufreq_frequency_table **table) +{ + if (!table) + return; + + kfree(*table); + *table = NULL; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_free_cpufreq_table); +#endif /* CONFIG_CPU_FREQ */ + +void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, + int last_cpu) +{ + struct device *cpu_dev; + int cpu; + + WARN_ON(cpumask_empty(cpumask)); + + for_each_cpu(cpu, cpumask) { + if (cpu == last_cpu) + break; + + cpu_dev = get_cpu_device(cpu); + if (!cpu_dev) { + pr_err("%s: failed to get cpu%d device\n", __func__, + cpu); + continue; + } + + dev_pm_opp_remove_table(cpu_dev); + } +} + +/** + * dev_pm_opp_cpumask_remove_table() - Removes OPP table for @cpumask + * @cpumask: cpumask for which OPP table needs to be removed + * + * This removes the OPP tables for CPUs present in the @cpumask. + * This should be used to remove all the OPPs entries associated with + * the cpus in @cpumask. + */ +void dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask) +{ + _dev_pm_opp_cpumask_remove_table(cpumask, -1); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_cpumask_remove_table); + +/** + * dev_pm_opp_set_sharing_cpus() - Mark OPP table as shared by few CPUs + * @cpu_dev: CPU device for which we do this operation + * @cpumask: cpumask of the CPUs which share the OPP table with @cpu_dev + * + * This marks OPP table of the @cpu_dev as shared by the CPUs present in + * @cpumask. + * + * Returns -ENODEV if OPP table isn't already present. + */ +int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, + const struct cpumask *cpumask) +{ + struct opp_device *opp_dev; + struct opp_table *opp_table; + struct device *dev; + int cpu, ret = 0; + + opp_table = _find_opp_table(cpu_dev); + if (IS_ERR(opp_table)) + return PTR_ERR(opp_table); + + for_each_cpu(cpu, cpumask) { + if (cpu == cpu_dev->id) + continue; + + dev = get_cpu_device(cpu); + if (!dev) { + dev_err(cpu_dev, "%s: failed to get cpu%d device\n", + __func__, cpu); + continue; + } + + opp_dev = _add_opp_dev(dev, opp_table); + if (!opp_dev) { + dev_err(dev, "%s: failed to add opp-dev for cpu%d device\n", + __func__, cpu); + continue; + } + + /* Mark opp-table as multiple CPUs are sharing it now */ + opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED; + } + + dev_pm_opp_put_opp_table(opp_table); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_set_sharing_cpus); + +/** + * dev_pm_opp_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with @cpu_dev + * @cpu_dev: CPU device for which we do this operation + * @cpumask: cpumask to update with information of sharing CPUs + * + * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. + * + * Returns -ENODEV if OPP table isn't already present and -EINVAL if the OPP + * table's status is access-unknown. + */ +int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) +{ + struct opp_device *opp_dev; + struct opp_table *opp_table; + int ret = 0; + + opp_table = _find_opp_table(cpu_dev); + if (IS_ERR(opp_table)) + return PTR_ERR(opp_table); + + if (opp_table->shared_opp == OPP_TABLE_ACCESS_UNKNOWN) { + ret = -EINVAL; + goto put_opp_table; + } + + cpumask_clear(cpumask); + + if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) { + mutex_lock(&opp_table->lock); + list_for_each_entry(opp_dev, &opp_table->dev_list, node) + cpumask_set_cpu(opp_dev->dev->id, cpumask); + mutex_unlock(&opp_table->lock); + } else { + cpumask_set_cpu(cpu_dev->id, cpumask); + } + +put_opp_table: + dev_pm_opp_put_opp_table(opp_table); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_get_sharing_cpus); diff --git a/drivers/opp/debugfs.c b/drivers/opp/debugfs.c new file mode 100644 index 000000000..60f4ff8e0 --- /dev/null +++ b/drivers/opp/debugfs.c @@ -0,0 +1,249 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic OPP debugfs interface + * + * Copyright (C) 2015-2016 Viresh Kumar <viresh.kumar@linaro.org> + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/debugfs.h> +#include <linux/device.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/limits.h> +#include <linux/slab.h> + +#include "opp.h" + +static struct dentry *rootdir; + +static void opp_set_dev_name(const struct device *dev, char *name) +{ + if (dev->parent) + snprintf(name, NAME_MAX, "%s-%s", dev_name(dev->parent), + dev_name(dev)); + else + snprintf(name, NAME_MAX, "%s", dev_name(dev)); +} + +void opp_debug_remove_one(struct dev_pm_opp *opp) +{ + debugfs_remove_recursive(opp->dentry); +} + +static ssize_t bw_name_read(struct file *fp, char __user *userbuf, + size_t count, loff_t *ppos) +{ + struct icc_path *path = fp->private_data; + char buf[64]; + int i; + + i = scnprintf(buf, sizeof(buf), "%.62s\n", icc_get_name(path)); + + return simple_read_from_buffer(userbuf, count, ppos, buf, i); +} + +static const struct file_operations bw_name_fops = { + .open = simple_open, + .read = bw_name_read, + .llseek = default_llseek, +}; + +static void opp_debug_create_bw(struct dev_pm_opp *opp, + struct opp_table *opp_table, + struct dentry *pdentry) +{ + struct dentry *d; + char name[11]; + int i; + + for (i = 0; i < opp_table->path_count; i++) { + snprintf(name, sizeof(name), "icc-path-%.1d", i); + + /* Create per-path directory */ + d = debugfs_create_dir(name, pdentry); + + debugfs_create_file("name", S_IRUGO, d, opp_table->paths[i], + &bw_name_fops); + debugfs_create_u32("peak_bw", S_IRUGO, d, + &opp->bandwidth[i].peak); + debugfs_create_u32("avg_bw", S_IRUGO, d, + &opp->bandwidth[i].avg); + } +} + +static void opp_debug_create_supplies(struct dev_pm_opp *opp, + struct opp_table *opp_table, + struct dentry *pdentry) +{ + struct dentry *d; + int i; + + for (i = 0; i < opp_table->regulator_count; i++) { + char name[15]; + + snprintf(name, sizeof(name), "supply-%d", i); + + /* Create per-opp directory */ + d = debugfs_create_dir(name, pdentry); + + debugfs_create_ulong("u_volt_target", S_IRUGO, d, + &opp->supplies[i].u_volt); + + debugfs_create_ulong("u_volt_min", S_IRUGO, d, + &opp->supplies[i].u_volt_min); + + debugfs_create_ulong("u_volt_max", S_IRUGO, d, + &opp->supplies[i].u_volt_max); + + debugfs_create_ulong("u_amp", S_IRUGO, d, + &opp->supplies[i].u_amp); + } +} + +void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) +{ + struct dentry *pdentry = opp_table->dentry; + struct dentry *d; + unsigned long id; + char name[25]; /* 20 chars for 64 bit value + 5 (opp:\0) */ + + /* + * Get directory name for OPP. + * + * - Normally rate is unique to each OPP, use it to get unique opp-name. + * - For some devices rate isn't available, use index instead. + */ + if (likely(opp->rate)) + id = opp->rate; + else + id = _get_opp_count(opp_table); + + snprintf(name, sizeof(name), "opp:%lu", id); + + /* Create per-opp directory */ + d = debugfs_create_dir(name, pdentry); + + debugfs_create_bool("available", S_IRUGO, d, &opp->available); + debugfs_create_bool("dynamic", S_IRUGO, d, &opp->dynamic); + debugfs_create_bool("turbo", S_IRUGO, d, &opp->turbo); + debugfs_create_bool("suspend", S_IRUGO, d, &opp->suspend); + debugfs_create_u32("performance_state", S_IRUGO, d, &opp->pstate); + debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate); + debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, + &opp->clock_latency_ns); + + opp_debug_create_supplies(opp, opp_table, d); + opp_debug_create_bw(opp, opp_table, d); + + opp->dentry = d; +} + +static void opp_list_debug_create_dir(struct opp_device *opp_dev, + struct opp_table *opp_table) +{ + const struct device *dev = opp_dev->dev; + struct dentry *d; + + opp_set_dev_name(dev, opp_table->dentry_name); + + /* Create device specific directory */ + d = debugfs_create_dir(opp_table->dentry_name, rootdir); + + opp_dev->dentry = d; + opp_table->dentry = d; +} + +static void opp_list_debug_create_link(struct opp_device *opp_dev, + struct opp_table *opp_table) +{ + char name[NAME_MAX]; + + opp_set_dev_name(opp_dev->dev, name); + + /* Create device specific directory link */ + opp_dev->dentry = debugfs_create_symlink(name, rootdir, + opp_table->dentry_name); +} + +/** + * opp_debug_register - add a device opp node to the debugfs 'opp' directory + * @opp_dev: opp-dev pointer for device + * @opp_table: the device-opp being added + * + * Dynamically adds device specific directory in debugfs 'opp' directory. If the + * device-opp is shared with other devices, then links will be created for all + * devices except the first. + */ +void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table) +{ + if (opp_table->dentry) + opp_list_debug_create_link(opp_dev, opp_table); + else + opp_list_debug_create_dir(opp_dev, opp_table); +} + +static void opp_migrate_dentry(struct opp_device *opp_dev, + struct opp_table *opp_table) +{ + struct opp_device *new_dev; + const struct device *dev; + struct dentry *dentry; + + /* Look for next opp-dev */ + list_for_each_entry(new_dev, &opp_table->dev_list, node) + if (new_dev != opp_dev) + break; + + /* new_dev is guaranteed to be valid here */ + dev = new_dev->dev; + debugfs_remove_recursive(new_dev->dentry); + + opp_set_dev_name(dev, opp_table->dentry_name); + + dentry = debugfs_rename(rootdir, opp_dev->dentry, rootdir, + opp_table->dentry_name); + if (IS_ERR(dentry)) { + dev_err(dev, "%s: Failed to rename link from: %s to %s\n", + __func__, dev_name(opp_dev->dev), dev_name(dev)); + return; + } + + new_dev->dentry = dentry; + opp_table->dentry = dentry; +} + +/** + * opp_debug_unregister - remove a device opp node from debugfs opp directory + * @opp_dev: opp-dev pointer for device + * @opp_table: the device-opp being removed + * + * Dynamically removes device specific directory from debugfs 'opp' directory. + */ +void opp_debug_unregister(struct opp_device *opp_dev, + struct opp_table *opp_table) +{ + if (opp_dev->dentry == opp_table->dentry) { + /* Move the real dentry object under another device */ + if (!list_is_singular(&opp_table->dev_list)) { + opp_migrate_dentry(opp_dev, opp_table); + goto out; + } + opp_table->dentry = NULL; + } + + debugfs_remove_recursive(opp_dev->dentry); + +out: + opp_dev->dentry = NULL; +} + +static int __init opp_debug_init(void) +{ + /* Create /sys/kernel/debug/opp directory */ + rootdir = debugfs_create_dir("opp", NULL); + + return 0; +} +core_initcall(opp_debug_init); diff --git a/drivers/opp/of.c b/drivers/opp/of.c new file mode 100644 index 000000000..3d7adc0de --- /dev/null +++ b/drivers/opp/of.c @@ -0,0 +1,1341 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Generic OPP OF helpers + * + * Copyright (C) 2009-2010 Texas Instruments Incorporated. + * Nishanth Menon + * Romit Dasgupta + * Kevin Hilman + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/cpu.h> +#include <linux/errno.h> +#include <linux/device.h> +#include <linux/of_device.h> +#include <linux/pm_domain.h> +#include <linux/slab.h> +#include <linux/export.h> +#include <linux/energy_model.h> + +#include "opp.h" + +/* + * Returns opp descriptor node for a device node, caller must + * do of_node_put(). + */ +static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np, + int index) +{ + /* "operating-points-v2" can be an array for power domain providers */ + return of_parse_phandle(np, "operating-points-v2", index); +} + +/* Returns opp descriptor node for a device, caller must do of_node_put() */ +struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev) +{ + return _opp_of_get_opp_desc_node(dev->of_node, 0); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node); + +struct opp_table *_managed_opp(struct device *dev, int index) +{ + struct opp_table *opp_table, *managed_table = NULL; + struct device_node *np; + + np = _opp_of_get_opp_desc_node(dev->of_node, index); + if (!np) + return NULL; + + list_for_each_entry(opp_table, &opp_tables, node) { + if (opp_table->np == np) { + /* + * Multiple devices can point to the same OPP table and + * so will have same node-pointer, np. + * + * But the OPPs will be considered as shared only if the + * OPP table contains a "opp-shared" property. + */ + if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) { + _get_opp_table_kref(opp_table); + managed_table = opp_table; + } + + break; + } + } + + of_node_put(np); + + return managed_table; +} + +/* The caller must call dev_pm_opp_put() after the OPP is used */ +static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table, + struct device_node *opp_np) +{ + struct dev_pm_opp *opp; + + mutex_lock(&opp_table->lock); + + list_for_each_entry(opp, &opp_table->opp_list, node) { + if (opp->np == opp_np) { + dev_pm_opp_get(opp); + mutex_unlock(&opp_table->lock); + return opp; + } + } + + mutex_unlock(&opp_table->lock); + + return NULL; +} + +static struct device_node *of_parse_required_opp(struct device_node *np, + int index) +{ + return of_parse_phandle(np, "required-opps", index); +} + +/* The caller must call dev_pm_opp_put_opp_table() after the table is used */ +static struct opp_table *_find_table_of_opp_np(struct device_node *opp_np) +{ + struct opp_table *opp_table; + struct device_node *opp_table_np; + + lockdep_assert_held(&opp_table_lock); + + opp_table_np = of_get_parent(opp_np); + if (!opp_table_np) + goto err; + + /* It is safe to put the node now as all we need now is its address */ + of_node_put(opp_table_np); + + list_for_each_entry(opp_table, &opp_tables, node) { + if (opp_table_np == opp_table->np) { + _get_opp_table_kref(opp_table); + return opp_table; + } + } + +err: + return ERR_PTR(-ENODEV); +} + +/* Free resources previously acquired by _opp_table_alloc_required_tables() */ +static void _opp_table_free_required_tables(struct opp_table *opp_table) +{ + struct opp_table **required_opp_tables = opp_table->required_opp_tables; + int i; + + if (!required_opp_tables) + return; + + for (i = 0; i < opp_table->required_opp_count; i++) { + if (IS_ERR_OR_NULL(required_opp_tables[i])) + break; + + dev_pm_opp_put_opp_table(required_opp_tables[i]); + } + + kfree(required_opp_tables); + + opp_table->required_opp_count = 0; + opp_table->required_opp_tables = NULL; +} + +/* + * Populate all devices and opp tables which are part of "required-opps" list. + * Checking only the first OPP node should be enough. + */ +static void _opp_table_alloc_required_tables(struct opp_table *opp_table, + struct device *dev, + struct device_node *opp_np) +{ + struct opp_table **required_opp_tables; + struct device_node *required_np, *np; + int count, i; + + /* Traversing the first OPP node is all we need */ + np = of_get_next_available_child(opp_np, NULL); + if (!np) { + dev_err(dev, "Empty OPP table\n"); + return; + } + + count = of_count_phandle_with_args(np, "required-opps", NULL); + if (!count) + goto put_np; + + required_opp_tables = kcalloc(count, sizeof(*required_opp_tables), + GFP_KERNEL); + if (!required_opp_tables) + goto put_np; + + opp_table->required_opp_tables = required_opp_tables; + opp_table->required_opp_count = count; + + for (i = 0; i < count; i++) { + required_np = of_parse_required_opp(np, i); + if (!required_np) + goto free_required_tables; + + required_opp_tables[i] = _find_table_of_opp_np(required_np); + of_node_put(required_np); + + if (IS_ERR(required_opp_tables[i])) + goto free_required_tables; + + /* + * We only support genpd's OPPs in the "required-opps" for now, + * as we don't know how much about other cases. Error out if the + * required OPP doesn't belong to a genpd. + */ + if (!required_opp_tables[i]->is_genpd) { + dev_err(dev, "required-opp doesn't belong to genpd: %pOF\n", + required_np); + goto free_required_tables; + } + } + + goto put_np; + +free_required_tables: + _opp_table_free_required_tables(opp_table); +put_np: + of_node_put(np); +} + +void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, + int index) +{ + struct device_node *np, *opp_np; + u32 val; + + /* + * Only required for backward compatibility with v1 bindings, but isn't + * harmful for other cases. And so we do it unconditionally. + */ + np = of_node_get(dev->of_node); + if (!np) + return; + + if (!of_property_read_u32(np, "clock-latency", &val)) + opp_table->clock_latency_ns_max = val; + of_property_read_u32(np, "voltage-tolerance", + &opp_table->voltage_tolerance_v1); + + if (of_find_property(np, "#power-domain-cells", NULL)) + opp_table->is_genpd = true; + + /* Get OPP table node */ + opp_np = _opp_of_get_opp_desc_node(np, index); + of_node_put(np); + + if (!opp_np) + return; + + if (of_property_read_bool(opp_np, "opp-shared")) + opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED; + else + opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE; + + opp_table->np = opp_np; + + _opp_table_alloc_required_tables(opp_table, dev, opp_np); + of_node_put(opp_np); +} + +void _of_clear_opp_table(struct opp_table *opp_table) +{ + _opp_table_free_required_tables(opp_table); +} + +/* + * Release all resources previously acquired with a call to + * _of_opp_alloc_required_opps(). + */ +void _of_opp_free_required_opps(struct opp_table *opp_table, + struct dev_pm_opp *opp) +{ + struct dev_pm_opp **required_opps = opp->required_opps; + int i; + + if (!required_opps) + return; + + for (i = 0; i < opp_table->required_opp_count; i++) { + if (!required_opps[i]) + break; + + /* Put the reference back */ + dev_pm_opp_put(required_opps[i]); + } + + kfree(required_opps); + opp->required_opps = NULL; +} + +/* Populate all required OPPs which are part of "required-opps" list */ +static int _of_opp_alloc_required_opps(struct opp_table *opp_table, + struct dev_pm_opp *opp) +{ + struct dev_pm_opp **required_opps; + struct opp_table *required_table; + struct device_node *np; + int i, ret, count = opp_table->required_opp_count; + + if (!count) + return 0; + + required_opps = kcalloc(count, sizeof(*required_opps), GFP_KERNEL); + if (!required_opps) + return -ENOMEM; + + opp->required_opps = required_opps; + + for (i = 0; i < count; i++) { + required_table = opp_table->required_opp_tables[i]; + + np = of_parse_required_opp(opp->np, i); + if (unlikely(!np)) { + ret = -ENODEV; + goto free_required_opps; + } + + required_opps[i] = _find_opp_of_np(required_table, np); + of_node_put(np); + + if (!required_opps[i]) { + pr_err("%s: Unable to find required OPP node: %pOF (%d)\n", + __func__, opp->np, i); + ret = -ENODEV; + goto free_required_opps; + } + } + + return 0; + +free_required_opps: + _of_opp_free_required_opps(opp_table, opp); + + return ret; +} + +static int _bandwidth_supported(struct device *dev, struct opp_table *opp_table) +{ + struct device_node *np, *opp_np; + struct property *prop; + + if (!opp_table) { + np = of_node_get(dev->of_node); + if (!np) + return -ENODEV; + + opp_np = _opp_of_get_opp_desc_node(np, 0); + of_node_put(np); + } else { + opp_np = of_node_get(opp_table->np); + } + + /* Lets not fail in case we are parsing opp-v1 bindings */ + if (!opp_np) + return 0; + + /* Checking only first OPP is sufficient */ + np = of_get_next_available_child(opp_np, NULL); + of_node_put(opp_np); + if (!np) { + dev_err(dev, "OPP table empty\n"); + return -EINVAL; + } + + prop = of_find_property(np, "opp-peak-kBps", NULL); + of_node_put(np); + + if (!prop || !prop->length) + return 0; + + return 1; +} + +int dev_pm_opp_of_find_icc_paths(struct device *dev, + struct opp_table *opp_table) +{ + struct device_node *np; + int ret, i, count, num_paths; + struct icc_path **paths; + + ret = _bandwidth_supported(dev, opp_table); + if (ret <= 0) + return ret; + + ret = 0; + + np = of_node_get(dev->of_node); + if (!np) + return 0; + + count = of_count_phandle_with_args(np, "interconnects", + "#interconnect-cells"); + of_node_put(np); + if (count < 0) + return 0; + + /* two phandles when #interconnect-cells = <1> */ + if (count % 2) { + dev_err(dev, "%s: Invalid interconnects values\n", __func__); + return -EINVAL; + } + + num_paths = count / 2; + paths = kcalloc(num_paths, sizeof(*paths), GFP_KERNEL); + if (!paths) + return -ENOMEM; + + for (i = 0; i < num_paths; i++) { + paths[i] = of_icc_get_by_index(dev, i); + if (IS_ERR(paths[i])) { + ret = PTR_ERR(paths[i]); + if (ret != -EPROBE_DEFER) { + dev_err(dev, "%s: Unable to get path%d: %d\n", + __func__, i, ret); + } + goto err; + } + } + + if (opp_table) { + opp_table->paths = paths; + opp_table->path_count = num_paths; + return 0; + } + +err: + while (i--) + icc_put(paths[i]); + + kfree(paths); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_find_icc_paths); + +static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, + struct device_node *np) +{ + unsigned int levels = opp_table->supported_hw_count; + int count, versions, ret, i, j; + u32 val; + + if (!opp_table->supported_hw) { + /* + * In the case that no supported_hw has been set by the + * platform but there is an opp-supported-hw value set for + * an OPP then the OPP should not be enabled as there is + * no way to see if the hardware supports it. + */ + if (of_find_property(np, "opp-supported-hw", NULL)) + return false; + else + return true; + } + + count = of_property_count_u32_elems(np, "opp-supported-hw"); + if (count <= 0 || count % levels) { + dev_err(dev, "%s: Invalid opp-supported-hw property (%d)\n", + __func__, count); + return false; + } + + versions = count / levels; + + /* All levels in at least one of the versions should match */ + for (i = 0; i < versions; i++) { + bool supported = true; + + for (j = 0; j < levels; j++) { + ret = of_property_read_u32_index(np, "opp-supported-hw", + i * levels + j, &val); + if (ret) { + dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n", + __func__, i * levels + j, ret); + return false; + } + + /* Check if the level is supported */ + if (!(val & opp_table->supported_hw[j])) { + supported = false; + break; + } + } + + if (supported) + return true; + } + + return false; +} + +static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, + struct opp_table *opp_table) +{ + u32 *microvolt, *microamp = NULL; + int supplies = opp_table->regulator_count, vcount, icount, ret, i, j; + struct property *prop = NULL; + char name[NAME_MAX]; + + /* Search for "opp-microvolt-<name>" */ + if (opp_table->prop_name) { + snprintf(name, sizeof(name), "opp-microvolt-%s", + opp_table->prop_name); + prop = of_find_property(opp->np, name, NULL); + } + + if (!prop) { + /* Search for "opp-microvolt" */ + sprintf(name, "opp-microvolt"); + prop = of_find_property(opp->np, name, NULL); + + /* Missing property isn't a problem, but an invalid entry is */ + if (!prop) { + if (unlikely(supplies == -1)) { + /* Initialize regulator_count */ + opp_table->regulator_count = 0; + return 0; + } + + if (!supplies) + return 0; + + dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n", + __func__); + return -EINVAL; + } + } + + if (unlikely(supplies == -1)) { + /* Initialize regulator_count */ + supplies = opp_table->regulator_count = 1; + } else if (unlikely(!supplies)) { + dev_err(dev, "%s: opp-microvolt wasn't expected\n", __func__); + return -EINVAL; + } + + vcount = of_property_count_u32_elems(opp->np, name); + if (vcount < 0) { + dev_err(dev, "%s: Invalid %s property (%d)\n", + __func__, name, vcount); + return vcount; + } + + /* There can be one or three elements per supply */ + if (vcount != supplies && vcount != supplies * 3) { + dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", + __func__, name, vcount, supplies); + return -EINVAL; + } + + microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL); + if (!microvolt) + return -ENOMEM; + + ret = of_property_read_u32_array(opp->np, name, microvolt, vcount); + if (ret) { + dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); + ret = -EINVAL; + goto free_microvolt; + } + + /* Search for "opp-microamp-<name>" */ + prop = NULL; + if (opp_table->prop_name) { + snprintf(name, sizeof(name), "opp-microamp-%s", + opp_table->prop_name); + prop = of_find_property(opp->np, name, NULL); + } + + if (!prop) { + /* Search for "opp-microamp" */ + sprintf(name, "opp-microamp"); + prop = of_find_property(opp->np, name, NULL); + } + + if (prop) { + icount = of_property_count_u32_elems(opp->np, name); + if (icount < 0) { + dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, + name, icount); + ret = icount; + goto free_microvolt; + } + + if (icount != supplies) { + dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", + __func__, name, icount, supplies); + ret = -EINVAL; + goto free_microvolt; + } + + microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL); + if (!microamp) { + ret = -EINVAL; + goto free_microvolt; + } + + ret = of_property_read_u32_array(opp->np, name, microamp, + icount); + if (ret) { + dev_err(dev, "%s: error parsing %s: %d\n", __func__, + name, ret); + ret = -EINVAL; + goto free_microamp; + } + } + + for (i = 0, j = 0; i < supplies; i++) { + opp->supplies[i].u_volt = microvolt[j++]; + + if (vcount == supplies) { + opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; + opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; + } else { + opp->supplies[i].u_volt_min = microvolt[j++]; + opp->supplies[i].u_volt_max = microvolt[j++]; + } + + if (microamp) + opp->supplies[i].u_amp = microamp[i]; + } + +free_microamp: + kfree(microamp); +free_microvolt: + kfree(microvolt); + + return ret; +} + +/** + * dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT + * entries + * @dev: device pointer used to lookup OPP table. + * + * Free OPPs created using static entries present in DT. + */ +void dev_pm_opp_of_remove_table(struct device *dev) +{ + dev_pm_opp_remove_table(dev); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table); + +static int _read_bw(struct dev_pm_opp *new_opp, struct opp_table *table, + struct device_node *np, bool peak) +{ + const char *name = peak ? "opp-peak-kBps" : "opp-avg-kBps"; + struct property *prop; + int i, count, ret; + u32 *bw; + + prop = of_find_property(np, name, NULL); + if (!prop) + return -ENODEV; + + count = prop->length / sizeof(u32); + if (table->path_count != count) { + pr_err("%s: Mismatch between %s and paths (%d %d)\n", + __func__, name, count, table->path_count); + return -EINVAL; + } + + bw = kmalloc_array(count, sizeof(*bw), GFP_KERNEL); + if (!bw) + return -ENOMEM; + + ret = of_property_read_u32_array(np, name, bw, count); + if (ret) { + pr_err("%s: Error parsing %s: %d\n", __func__, name, ret); + goto out; + } + + for (i = 0; i < count; i++) { + if (peak) + new_opp->bandwidth[i].peak = kBps_to_icc(bw[i]); + else + new_opp->bandwidth[i].avg = kBps_to_icc(bw[i]); + } + +out: + kfree(bw); + return ret; +} + +static int _read_opp_key(struct dev_pm_opp *new_opp, struct opp_table *table, + struct device_node *np, bool *rate_not_available) +{ + bool found = false; + u64 rate; + int ret; + + ret = of_property_read_u64(np, "opp-hz", &rate); + if (!ret) { + /* + * Rate is defined as an unsigned long in clk API, and so + * casting explicitly to its type. Must be fixed once rate is 64 + * bit guaranteed in clk API. + */ + new_opp->rate = (unsigned long)rate; + found = true; + } + *rate_not_available = !!ret; + + /* + * Bandwidth consists of peak and average (optional) values: + * opp-peak-kBps = <path1_value path2_value>; + * opp-avg-kBps = <path1_value path2_value>; + */ + ret = _read_bw(new_opp, table, np, true); + if (!ret) { + found = true; + ret = _read_bw(new_opp, table, np, false); + } + + /* The properties were found but we failed to parse them */ + if (ret && ret != -ENODEV) + return ret; + + if (!of_property_read_u32(np, "opp-level", &new_opp->level)) + found = true; + + if (found) + return 0; + + return ret; +} + +/** + * _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings) + * @opp_table: OPP table + * @dev: device for which we do this operation + * @np: device node + * + * This function adds an opp definition to the opp table and returns status. The + * opp can be controlled using dev_pm_opp_enable/disable functions and may be + * removed by dev_pm_opp_remove. + * + * Return: + * Valid OPP pointer: + * On success + * NULL: + * Duplicate OPPs (both freq and volt are same) and opp->available + * OR if the OPP is not supported by hardware. + * ERR_PTR(-EEXIST): + * Freq are same and volt are different OR + * Duplicate OPPs (both freq and volt are same) and !opp->available + * ERR_PTR(-ENOMEM): + * Memory allocation failure + * ERR_PTR(-EINVAL): + * Failed parsing the OPP node + */ +static struct dev_pm_opp *_opp_add_static_v2(struct opp_table *opp_table, + struct device *dev, struct device_node *np) +{ + struct dev_pm_opp *new_opp; + u32 val; + int ret; + bool rate_not_available = false; + + new_opp = _opp_allocate(opp_table); + if (!new_opp) + return ERR_PTR(-ENOMEM); + + ret = _read_opp_key(new_opp, opp_table, np, &rate_not_available); + if (ret < 0 && !opp_table->is_genpd) { + dev_err(dev, "%s: opp key field not found\n", __func__); + goto free_opp; + } + + /* Check if the OPP supports hardware's hierarchy of versions or not */ + if (!_opp_is_supported(dev, opp_table, np)) { + dev_dbg(dev, "OPP not supported by hardware: %lu\n", + new_opp->rate); + goto free_opp; + } + + new_opp->turbo = of_property_read_bool(np, "turbo-mode"); + + new_opp->np = np; + new_opp->dynamic = false; + new_opp->available = true; + + ret = _of_opp_alloc_required_opps(opp_table, new_opp); + if (ret) + goto free_opp; + + if (!of_property_read_u32(np, "clock-latency-ns", &val)) + new_opp->clock_latency_ns = val; + + ret = opp_parse_supplies(new_opp, dev, opp_table); + if (ret) + goto free_required_opps; + + if (opp_table->is_genpd) + new_opp->pstate = pm_genpd_opp_to_performance_state(dev, new_opp); + + ret = _opp_add(dev, new_opp, opp_table, rate_not_available); + if (ret) { + /* Don't return error for duplicate OPPs */ + if (ret == -EBUSY) + ret = 0; + goto free_required_opps; + } + + /* OPP to select on device suspend */ + if (of_property_read_bool(np, "opp-suspend")) { + if (opp_table->suspend_opp) { + /* Pick the OPP with higher rate as suspend OPP */ + if (new_opp->rate > opp_table->suspend_opp->rate) { + opp_table->suspend_opp->suspend = false; + new_opp->suspend = true; + opp_table->suspend_opp = new_opp; + } + } else { + new_opp->suspend = true; + opp_table->suspend_opp = new_opp; + } + } + + if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max) + opp_table->clock_latency_ns_max = new_opp->clock_latency_ns; + + pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", + __func__, new_opp->turbo, new_opp->rate, + new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min, + new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns); + + /* + * 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 new_opp; + +free_required_opps: + _of_opp_free_required_opps(opp_table, new_opp); +free_opp: + _opp_free(new_opp); + + return ret ? ERR_PTR(ret) : NULL; +} + +/* Initializes OPP tables based on new bindings */ +static int _of_add_opp_table_v2(struct device *dev, struct opp_table *opp_table) +{ + struct device_node *np; + int ret, count = 0; + struct dev_pm_opp *opp; + + /* OPP table is already initialized for the device */ + mutex_lock(&opp_table->lock); + if (opp_table->parsed_static_opps) { + opp_table->parsed_static_opps++; + mutex_unlock(&opp_table->lock); + return 0; + } + + opp_table->parsed_static_opps = 1; + mutex_unlock(&opp_table->lock); + + /* We have opp-table node now, iterate over it and add OPPs */ + for_each_available_child_of_node(opp_table->np, np) { + opp = _opp_add_static_v2(opp_table, dev, np); + if (IS_ERR(opp)) { + ret = PTR_ERR(opp); + dev_err(dev, "%s: Failed to add OPP, %d\n", __func__, + ret); + of_node_put(np); + goto remove_static_opp; + } else if (opp) { + count++; + } + } + + /* There should be one or more OPPs defined */ + if (!count) { + dev_err(dev, "%s: no supported OPPs", __func__); + ret = -ENOENT; + goto remove_static_opp; + } + + list_for_each_entry(opp, &opp_table->opp_list, node) { + /* Any non-zero performance state would enable the feature */ + if (opp->pstate) { + opp_table->genpd_performance_state = true; + break; + } + } + + return 0; + +remove_static_opp: + _opp_remove_all_static(opp_table); + + return ret; +} + +/* Initializes OPP tables based on old-deprecated bindings */ +static int _of_add_opp_table_v1(struct device *dev, struct opp_table *opp_table) +{ + const struct property *prop; + const __be32 *val; + int nr, ret = 0; + + mutex_lock(&opp_table->lock); + if (opp_table->parsed_static_opps) { + opp_table->parsed_static_opps++; + mutex_unlock(&opp_table->lock); + return 0; + } + + opp_table->parsed_static_opps = 1; + mutex_unlock(&opp_table->lock); + + prop = of_find_property(dev->of_node, "operating-points", NULL); + if (!prop) { + ret = -ENODEV; + goto remove_static_opp; + } + if (!prop->value) { + ret = -ENODATA; + goto remove_static_opp; + } + + /* + * Each OPP is a set of tuples consisting of frequency and + * voltage like <freq-kHz vol-uV>. + */ + nr = prop->length / sizeof(u32); + if (nr % 2) { + dev_err(dev, "%s: Invalid OPP table\n", __func__); + ret = -EINVAL; + goto remove_static_opp; + } + + val = prop->value; + while (nr) { + unsigned long freq = be32_to_cpup(val++) * 1000; + unsigned long volt = be32_to_cpup(val++); + + ret = _opp_add_v1(opp_table, dev, freq, volt, false); + if (ret) { + dev_err(dev, "%s: Failed to add OPP %ld (%d)\n", + __func__, freq, ret); + goto remove_static_opp; + } + nr -= 2; + } + + return 0; + +remove_static_opp: + _opp_remove_all_static(opp_table); + + return ret; +} + +/** + * dev_pm_opp_of_add_table() - Initialize opp table from device tree + * @dev: device pointer used to lookup OPP table. + * + * Register the initial OPP table with the OPP library for given device. + * + * 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 + * -ENODEV when 'operating-points' property is not found or is invalid data + * in device node. + * -ENODATA when empty 'operating-points' property is found + * -EINVAL when invalid entries are found in opp-v2 table + */ +int dev_pm_opp_of_add_table(struct device *dev) +{ + struct opp_table *opp_table; + int ret; + + opp_table = dev_pm_opp_get_opp_table_indexed(dev, 0); + if (IS_ERR(opp_table)) + return PTR_ERR(opp_table); + + /* + * OPPs have two version of bindings now. Also try the old (v1) + * bindings for backward compatibility with older dtbs. + */ + if (opp_table->np) + ret = _of_add_opp_table_v2(dev, opp_table); + else + ret = _of_add_opp_table_v1(dev, opp_table); + + if (ret) + dev_pm_opp_put_opp_table(opp_table); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table); + +/** + * dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree + * @dev: device pointer used to lookup OPP table. + * @index: Index number. + * + * Register the initial OPP table with the OPP library for given device only + * using the "operating-points-v2" property. + * + * 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 + * -ENODEV when 'operating-points' property is not found or is invalid data + * in device node. + * -ENODATA when empty 'operating-points' property is found + * -EINVAL when invalid entries are found in opp-v2 table + */ +int dev_pm_opp_of_add_table_indexed(struct device *dev, int index) +{ + struct opp_table *opp_table; + int ret, count; + + if (index) { + /* + * If only one phandle is present, then the same OPP table + * applies for all index requests. + */ + count = of_count_phandle_with_args(dev->of_node, + "operating-points-v2", NULL); + if (count == 1) + index = 0; + } + + opp_table = dev_pm_opp_get_opp_table_indexed(dev, index); + if (IS_ERR(opp_table)) + return PTR_ERR(opp_table); + + ret = _of_add_opp_table_v2(dev, opp_table); + if (ret) + dev_pm_opp_put_opp_table(opp_table); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed); + +/* CPU device specific helpers */ + +/** + * dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask + * @cpumask: cpumask for which OPP table needs to be removed + * + * This removes the OPP tables for CPUs present in the @cpumask. + * This should be used only to remove static entries created from DT. + */ +void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask) +{ + _dev_pm_opp_cpumask_remove_table(cpumask, -1); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table); + +/** + * dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask + * @cpumask: cpumask for which OPP table needs to be added. + * + * This adds the OPP tables for CPUs present in the @cpumask. + */ +int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask) +{ + struct device *cpu_dev; + int cpu, ret; + + if (WARN_ON(cpumask_empty(cpumask))) + return -ENODEV; + + for_each_cpu(cpu, cpumask) { + cpu_dev = get_cpu_device(cpu); + if (!cpu_dev) { + pr_err("%s: failed to get cpu%d device\n", __func__, + cpu); + ret = -ENODEV; + goto remove_table; + } + + ret = dev_pm_opp_of_add_table(cpu_dev); + if (ret) { + /* + * OPP may get registered dynamically, don't print error + * message here. + */ + pr_debug("%s: couldn't find opp table for cpu:%d, %d\n", + __func__, cpu, ret); + + goto remove_table; + } + } + + return 0; + +remove_table: + /* Free all other OPPs */ + _dev_pm_opp_cpumask_remove_table(cpumask, cpu); + + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table); + +/* + * Works only for OPP v2 bindings. + * + * Returns -ENOENT if operating-points-v2 bindings aren't supported. + */ +/** + * dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with + * @cpu_dev using operating-points-v2 + * bindings. + * + * @cpu_dev: CPU device for which we do this operation + * @cpumask: cpumask to update with information of sharing CPUs + * + * This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev. + * + * Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev. + */ +int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev, + struct cpumask *cpumask) +{ + struct device_node *np, *tmp_np, *cpu_np; + int cpu, ret = 0; + + /* Get OPP descriptor node */ + np = dev_pm_opp_of_get_opp_desc_node(cpu_dev); + if (!np) { + dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__); + return -ENOENT; + } + + cpumask_set_cpu(cpu_dev->id, cpumask); + + /* OPPs are shared ? */ + if (!of_property_read_bool(np, "opp-shared")) + goto put_cpu_node; + + for_each_possible_cpu(cpu) { + if (cpu == cpu_dev->id) + continue; + + cpu_np = of_cpu_device_node_get(cpu); + if (!cpu_np) { + dev_err(cpu_dev, "%s: failed to get cpu%d node\n", + __func__, cpu); + ret = -ENOENT; + goto put_cpu_node; + } + + /* Get OPP descriptor node */ + tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0); + of_node_put(cpu_np); + if (!tmp_np) { + pr_err("%pOF: Couldn't find opp node\n", cpu_np); + ret = -ENOENT; + goto put_cpu_node; + } + + /* CPUs are sharing opp node */ + if (np == tmp_np) + cpumask_set_cpu(cpu, cpumask); + + of_node_put(tmp_np); + } + +put_cpu_node: + of_node_put(np); + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus); + +/** + * of_get_required_opp_performance_state() - Search for required OPP and return its performance state. + * @np: Node that contains the "required-opps" property. + * @index: Index of the phandle to parse. + * + * Returns the performance state of the OPP pointed out by the "required-opps" + * property at @index in @np. + * + * Return: Zero or positive performance state on success, otherwise negative + * value on errors. + */ +int of_get_required_opp_performance_state(struct device_node *np, int index) +{ + struct dev_pm_opp *opp; + struct device_node *required_np; + struct opp_table *opp_table; + int pstate = -EINVAL; + + required_np = of_parse_required_opp(np, index); + if (!required_np) + return -ENODEV; + + opp_table = _find_table_of_opp_np(required_np); + if (IS_ERR(opp_table)) { + pr_err("%s: Failed to find required OPP table %pOF: %ld\n", + __func__, np, PTR_ERR(opp_table)); + goto put_required_np; + } + + opp = _find_opp_of_np(opp_table, required_np); + if (opp) { + pstate = opp->pstate; + dev_pm_opp_put(opp); + } + + dev_pm_opp_put_opp_table(opp_table); + +put_required_np: + of_node_put(required_np); + + return pstate; +} +EXPORT_SYMBOL_GPL(of_get_required_opp_performance_state); + +/** + * dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp + * @opp: opp for which DT node has to be returned for + * + * Return: DT node corresponding to the opp, else 0 on success. + * + * The caller needs to put the node with of_node_put() after using it. + */ +struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp) +{ + if (IS_ERR_OR_NULL(opp)) { + pr_err("%s: Invalid parameters\n", __func__); + return NULL; + } + + return of_node_get(opp->np); +} +EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node); + +/* + * Callback function provided to the Energy Model framework upon registration. + * This computes the power estimated by @dev at @kHz if it is the frequency + * of an existing OPP, or at the frequency of the first OPP above @kHz otherwise + * (see dev_pm_opp_find_freq_ceil()). This function updates @kHz to the ceiled + * frequency and @mW to the associated power. The power is estimated as + * P = C * V^2 * f with C being the device's capacitance and V and f + * respectively the voltage and frequency of the OPP. + * + * Returns -EINVAL if the power calculation failed because of missing + * parameters, 0 otherwise. + */ +static int __maybe_unused _get_power(unsigned long *mW, unsigned long *kHz, + struct device *dev) +{ + struct dev_pm_opp *opp; + struct device_node *np; + unsigned long mV, Hz; + u32 cap; + u64 tmp; + int ret; + + np = of_node_get(dev->of_node); + if (!np) + return -EINVAL; + + ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap); + of_node_put(np); + if (ret) + return -EINVAL; + + Hz = *kHz * 1000; + opp = dev_pm_opp_find_freq_ceil(dev, &Hz); + if (IS_ERR(opp)) + return -EINVAL; + + mV = dev_pm_opp_get_voltage(opp) / 1000; + dev_pm_opp_put(opp); + if (!mV) + return -EINVAL; + + tmp = (u64)cap * mV * mV * (Hz / 1000000); + do_div(tmp, 1000000000); + + *mW = (unsigned long)tmp; + *kHz = Hz / 1000; + + return 0; +} + +/** + * dev_pm_opp_of_register_em() - Attempt to register an Energy Model + * @dev : Device for which an Energy Model has to be registered + * @cpus : CPUs for which an Energy Model has to be registered. For + * other type of devices it should be set to NULL. + * + * This checks whether the "dynamic-power-coefficient" devicetree property has + * been specified, and tries to register an Energy Model with it if it has. + * Having this property means the voltages are known for OPPs and the EM + * might be calculated. + */ +int dev_pm_opp_of_register_em(struct device *dev, struct cpumask *cpus) +{ + struct em_data_callback em_cb = EM_DATA_CB(_get_power); + struct device_node *np; + int ret, nr_opp; + u32 cap; + + if (IS_ERR_OR_NULL(dev)) { + ret = -EINVAL; + goto failed; + } + + nr_opp = dev_pm_opp_get_opp_count(dev); + if (nr_opp <= 0) { + ret = -EINVAL; + goto failed; + } + + np = of_node_get(dev->of_node); + if (!np) { + ret = -EINVAL; + goto failed; + } + + /* + * Register an EM only if the 'dynamic-power-coefficient' property is + * set in devicetree. It is assumed the voltage values are known if that + * property is set since it is useless otherwise. If voltages are not + * known, just let the EM registration fail with an error to alert the + * user about the inconsistent configuration. + */ + ret = of_property_read_u32(np, "dynamic-power-coefficient", &cap); + of_node_put(np); + if (ret || !cap) { + dev_dbg(dev, "Couldn't find proper 'dynamic-power-coefficient' in DT\n"); + ret = -EINVAL; + goto failed; + } + + ret = em_dev_register_perf_domain(dev, nr_opp, &em_cb, cpus); + if (ret) + goto failed; + + return 0; + +failed: + dev_dbg(dev, "Couldn't register Energy Model %d\n", ret); + return ret; +} +EXPORT_SYMBOL_GPL(dev_pm_opp_of_register_em); diff --git a/drivers/opp/opp.h b/drivers/opp/opp.h new file mode 100644 index 000000000..ebd930e0b --- /dev/null +++ b/drivers/opp/opp.h @@ -0,0 +1,262 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Generic OPP Interface + * + * Copyright (C) 2009-2010 Texas Instruments Incorporated. + * Nishanth Menon + * Romit Dasgupta + * Kevin Hilman + */ + +#ifndef __DRIVER_OPP_H__ +#define __DRIVER_OPP_H__ + +#include <linux/device.h> +#include <linux/interconnect.h> +#include <linux/kernel.h> +#include <linux/kref.h> +#include <linux/list.h> +#include <linux/limits.h> +#include <linux/pm_opp.h> +#include <linux/notifier.h> + +struct clk; +struct regulator; + +/* Lock to allow exclusive modification to the device and opp lists */ +extern struct mutex opp_table_lock; + +extern struct list_head opp_tables; + +/* + * Internal data structure organization with the OPP layer library is as + * follows: + * opp_tables (root) + * |- device 1 (represents voltage domain 1) + * | |- opp 1 (availability, freq, voltage) + * | |- opp 2 .. + * ... ... + * | `- opp n .. + * |- device 2 (represents the next voltage domain) + * ... + * `- device m (represents mth voltage domain) + * device 1, 2.. are represented by opp_table structure while each opp + * is represented by the opp structure. + */ + +/** + * struct dev_pm_opp - Generic OPP description structure + * @node: opp table node. The nodes are maintained throughout the lifetime + * of boot. It is expected only an optimal set of OPPs are + * added to the library by the SoC framework. + * IMPORTANT: the opp nodes should be maintained in increasing + * order. + * @kref: for reference count of the OPP. + * @available: true/false - marks if this OPP as available or not + * @dynamic: not-created from static DT entries. + * @turbo: true if turbo (boost) OPP + * @suspend: true if suspend OPP + * @pstate: Device's power domain's performance state. + * @rate: Frequency in hertz + * @level: Performance level + * @supplies: Power supplies voltage/current values + * @bandwidth: Interconnect bandwidth values + * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's + * frequency from any other OPP's frequency. + * @required_opps: List of OPPs that are required by this OPP. + * @opp_table: points back to the opp_table struct this opp belongs to + * @np: OPP's device node. + * @dentry: debugfs dentry pointer (per opp) + * + * This structure stores the OPP information for a given device. + */ +struct dev_pm_opp { + struct list_head node; + struct kref kref; + + bool available; + bool dynamic; + bool turbo; + bool suspend; + unsigned int pstate; + unsigned long rate; + unsigned int level; + + struct dev_pm_opp_supply *supplies; + struct dev_pm_opp_icc_bw *bandwidth; + + unsigned long clock_latency_ns; + + struct dev_pm_opp **required_opps; + struct opp_table *opp_table; + + struct device_node *np; + +#ifdef CONFIG_DEBUG_FS + struct dentry *dentry; +#endif +}; + +/** + * struct opp_device - devices managed by 'struct opp_table' + * @node: list node + * @dev: device to which the struct object belongs + * @dentry: debugfs dentry pointer (per device) + * + * This is an internal data structure maintaining the devices that are managed + * by 'struct opp_table'. + */ +struct opp_device { + struct list_head node; + const struct device *dev; + +#ifdef CONFIG_DEBUG_FS + struct dentry *dentry; +#endif +}; + +enum opp_table_access { + OPP_TABLE_ACCESS_UNKNOWN = 0, + OPP_TABLE_ACCESS_EXCLUSIVE = 1, + OPP_TABLE_ACCESS_SHARED = 2, +}; + +/** + * struct opp_table - Device opp structure + * @node: table node - contains the devices with OPPs that + * have been registered. Nodes once added are not modified in this + * table. + * @head: notifier head to notify the OPP availability changes. + * @dev_list: list of devices that share these OPPs + * @opp_list: table of opps + * @kref: for reference count of the table. + * @lock: mutex protecting the opp_list and dev_list. + * @np: struct device_node pointer for opp's DT node. + * @clock_latency_ns_max: Max clock latency in nanoseconds. + * @parsed_static_opps: Count of devices for which OPPs are initialized from DT. + * @shared_opp: OPP is shared between multiple devices. + * @suspend_opp: Pointer to OPP to be used during device suspend. + * @genpd_virt_dev_lock: Mutex protecting the genpd virtual device pointers. + * @genpd_virt_devs: List of virtual devices for multiple genpd support. + * @required_opp_tables: List of device OPP tables that are required by OPPs in + * this table. + * @required_opp_count: Number of required devices. + * @supported_hw: Array of version number to support. + * @supported_hw_count: Number of elements in supported_hw array. + * @prop_name: A name to postfix to many DT properties, while parsing them. + * @clk: Device's clock handle + * @regulators: Supply regulators + * @regulator_count: Number of power supply regulators. Its value can be -1 + * (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt + * property). + * @paths: Interconnect path handles + * @path_count: Number of interconnect paths + * @enabled: Set to true if the device's resources are enabled/configured. + * @genpd_performance_state: Device's power domain support performance state. + * @is_genpd: Marks if the OPP table belongs to a genpd. + * @set_opp: Platform specific set_opp callback + * @set_opp_data: Data to be passed to set_opp callback + * @dentry: debugfs dentry pointer of the real device directory (not links). + * @dentry_name: Name of the real dentry. + * + * @voltage_tolerance_v1: In percentage, for v1 bindings only. + * + * This is an internal data structure maintaining the link to opps attached to + * a device. This structure is not meant to be shared to users as it is + * meant for book keeping and private to OPP library. + */ +struct opp_table { + struct list_head node; + + struct blocking_notifier_head head; + struct list_head dev_list; + struct list_head opp_list; + struct kref kref; + struct mutex lock; + + struct device_node *np; + unsigned long clock_latency_ns_max; + + /* For backward compatibility with v1 bindings */ + unsigned int voltage_tolerance_v1; + + unsigned int parsed_static_opps; + enum opp_table_access shared_opp; + struct dev_pm_opp *suspend_opp; + + struct mutex genpd_virt_dev_lock; + struct device **genpd_virt_devs; + struct opp_table **required_opp_tables; + unsigned int required_opp_count; + + unsigned int *supported_hw; + unsigned int supported_hw_count; + const char *prop_name; + struct clk *clk; + struct regulator **regulators; + int regulator_count; + struct icc_path **paths; + unsigned int path_count; + bool enabled; + bool genpd_performance_state; + bool is_genpd; + + int (*set_opp)(struct dev_pm_set_opp_data *data); + struct dev_pm_set_opp_data *set_opp_data; + +#ifdef CONFIG_DEBUG_FS + struct dentry *dentry; + char dentry_name[NAME_MAX]; +#endif +}; + +/* Routines internal to opp core */ +void dev_pm_opp_get(struct dev_pm_opp *opp); +bool _opp_remove_all_static(struct opp_table *opp_table); +void _get_opp_table_kref(struct opp_table *opp_table); +int _get_opp_count(struct opp_table *opp_table); +struct opp_table *_find_opp_table(struct device *dev); +struct opp_device *_add_opp_dev(const struct device *dev, struct opp_table *opp_table); +struct dev_pm_opp *_opp_allocate(struct opp_table *opp_table); +void _opp_free(struct dev_pm_opp *opp); +int _opp_compare_key(struct dev_pm_opp *opp1, struct dev_pm_opp *opp2); +int _opp_add(struct device *dev, struct dev_pm_opp *new_opp, struct opp_table *opp_table, bool rate_not_available); +int _opp_add_v1(struct opp_table *opp_table, struct device *dev, unsigned long freq, long u_volt, bool dynamic); +void _dev_pm_opp_cpumask_remove_table(const struct cpumask *cpumask, int last_cpu); +struct opp_table *_add_opp_table(struct device *dev); +void _put_opp_list_kref(struct opp_table *opp_table); + +#ifdef CONFIG_OF +void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index); +void _of_clear_opp_table(struct opp_table *opp_table); +struct opp_table *_managed_opp(struct device *dev, int index); +void _of_opp_free_required_opps(struct opp_table *opp_table, + struct dev_pm_opp *opp); +#else +static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {} +static inline void _of_clear_opp_table(struct opp_table *opp_table) {} +static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; } +static inline void _of_opp_free_required_opps(struct opp_table *opp_table, + struct dev_pm_opp *opp) {} +#endif + +#ifdef CONFIG_DEBUG_FS +void opp_debug_remove_one(struct dev_pm_opp *opp); +void opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table); +void opp_debug_register(struct opp_device *opp_dev, struct opp_table *opp_table); +void opp_debug_unregister(struct opp_device *opp_dev, struct opp_table *opp_table); +#else +static inline void opp_debug_remove_one(struct dev_pm_opp *opp) {} + +static inline void opp_debug_create_one(struct dev_pm_opp *opp, + struct opp_table *opp_table) { } + +static inline void opp_debug_register(struct opp_device *opp_dev, + struct opp_table *opp_table) { } + +static inline void opp_debug_unregister(struct opp_device *opp_dev, + struct opp_table *opp_table) +{ } +#endif /* DEBUG_FS */ + +#endif /* __DRIVER_OPP_H__ */ diff --git a/drivers/opp/ti-opp-supply.c b/drivers/opp/ti-opp-supply.c new file mode 100644 index 000000000..bd4771f38 --- /dev/null +++ b/drivers/opp/ti-opp-supply.c @@ -0,0 +1,427 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2016-2017 Texas Instruments Incorporated - https://www.ti.com/ + * Nishanth Menon <nm@ti.com> + * Dave Gerlach <d-gerlach@ti.com> + * + * TI OPP supply driver that provides override into the regulator control + * for generic opp core to handle devices with ABB regulator and/or + * SmartReflex Class0. + */ +#include <linux/clk.h> +#include <linux/cpufreq.h> +#include <linux/device.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/notifier.h> +#include <linux/of_device.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/pm_opp.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> + +/** + * struct ti_opp_supply_optimum_voltage_table - optimized voltage table + * @reference_uv: reference voltage (usually Nominal voltage) + * @optimized_uv: Optimized voltage from efuse + */ +struct ti_opp_supply_optimum_voltage_table { + unsigned int reference_uv; + unsigned int optimized_uv; +}; + +/** + * struct ti_opp_supply_data - OMAP specific opp supply data + * @vdd_table: Optimized voltage mapping table + * @num_vdd_table: number of entries in vdd_table + * @vdd_absolute_max_voltage_uv: absolute maximum voltage in UV for the supply + */ +struct ti_opp_supply_data { + struct ti_opp_supply_optimum_voltage_table *vdd_table; + u32 num_vdd_table; + u32 vdd_absolute_max_voltage_uv; +}; + +static struct ti_opp_supply_data opp_data; + +/** + * struct ti_opp_supply_of_data - device tree match data + * @flags: specific type of opp supply + * @efuse_voltage_mask: mask required for efuse register representing voltage + * @efuse_voltage_uv: Are the efuse entries in micro-volts? if not, assume + * milli-volts. + */ +struct ti_opp_supply_of_data { +#define OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE BIT(1) +#define OPPDM_HAS_NO_ABB BIT(2) + const u8 flags; + const u32 efuse_voltage_mask; + const bool efuse_voltage_uv; +}; + +/** + * _store_optimized_voltages() - store optimized voltages + * @dev: ti opp supply device for which we need to store info + * @data: data specific to the device + * + * Picks up efuse based optimized voltages for VDD unique per device and + * stores it in internal data structure for use during transition requests. + * + * Return: If successful, 0, else appropriate error value. + */ +static int _store_optimized_voltages(struct device *dev, + struct ti_opp_supply_data *data) +{ + void __iomem *base; + struct property *prop; + struct resource *res; + const __be32 *val; + int proplen, i; + int ret = 0; + struct ti_opp_supply_optimum_voltage_table *table; + const struct ti_opp_supply_of_data *of_data = dev_get_drvdata(dev); + + /* pick up Efuse based voltages */ + res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 0); + if (!res) { + dev_err(dev, "Unable to get IO resource\n"); + ret = -ENODEV; + goto out_map; + } + + base = ioremap(res->start, resource_size(res)); + if (!base) { + dev_err(dev, "Unable to map Efuse registers\n"); + ret = -ENOMEM; + goto out_map; + } + + /* Fetch efuse-settings. */ + prop = of_find_property(dev->of_node, "ti,efuse-settings", NULL); + if (!prop) { + dev_err(dev, "No 'ti,efuse-settings' property found\n"); + ret = -EINVAL; + goto out; + } + + proplen = prop->length / sizeof(int); + data->num_vdd_table = proplen / 2; + /* Verify for corrupted OPP entries in dt */ + if (data->num_vdd_table * 2 * sizeof(int) != prop->length) { + dev_err(dev, "Invalid 'ti,efuse-settings'\n"); + ret = -EINVAL; + goto out; + } + + ret = of_property_read_u32(dev->of_node, "ti,absolute-max-voltage-uv", + &data->vdd_absolute_max_voltage_uv); + if (ret) { + dev_err(dev, "ti,absolute-max-voltage-uv is missing\n"); + ret = -EINVAL; + goto out; + } + + table = kcalloc(data->num_vdd_table, sizeof(*data->vdd_table), + GFP_KERNEL); + if (!table) { + ret = -ENOMEM; + goto out; + } + data->vdd_table = table; + + val = prop->value; + for (i = 0; i < data->num_vdd_table; i++, table++) { + u32 efuse_offset; + u32 tmp; + + table->reference_uv = be32_to_cpup(val++); + efuse_offset = be32_to_cpup(val++); + + tmp = readl(base + efuse_offset); + tmp &= of_data->efuse_voltage_mask; + tmp >>= __ffs(of_data->efuse_voltage_mask); + + table->optimized_uv = of_data->efuse_voltage_uv ? tmp : + tmp * 1000; + + dev_dbg(dev, "[%d] efuse=0x%08x volt_table=%d vset=%d\n", + i, efuse_offset, table->reference_uv, + table->optimized_uv); + + /* + * Some older samples might not have optimized efuse + * Use reference voltage for those - just add debug message + * for them. + */ + if (!table->optimized_uv) { + dev_dbg(dev, "[%d] efuse=0x%08x volt_table=%d:vset0\n", + i, efuse_offset, table->reference_uv); + table->optimized_uv = table->reference_uv; + } + } +out: + iounmap(base); +out_map: + return ret; +} + +/** + * _free_optimized_voltages() - free resources for optvoltages + * @dev: device for which we need to free info + * @data: data specific to the device + */ +static void _free_optimized_voltages(struct device *dev, + struct ti_opp_supply_data *data) +{ + kfree(data->vdd_table); + data->vdd_table = NULL; + data->num_vdd_table = 0; +} + +/** + * _get_optimal_vdd_voltage() - Finds optimal voltage for the supply + * @dev: device for which we need to find info + * @data: data specific to the device + * @reference_uv: reference voltage (OPP voltage) for which we need value + * + * Return: if a match is found, return optimized voltage, else return + * reference_uv, also return reference_uv if no optimization is needed. + */ +static int _get_optimal_vdd_voltage(struct device *dev, + struct ti_opp_supply_data *data, + int reference_uv) +{ + int i; + struct ti_opp_supply_optimum_voltage_table *table; + + if (!data->num_vdd_table) + return reference_uv; + + table = data->vdd_table; + if (!table) + return -EINVAL; + + /* Find a exact match - this list is usually very small */ + for (i = 0; i < data->num_vdd_table; i++, table++) + if (table->reference_uv == reference_uv) + return table->optimized_uv; + + /* IF things are screwed up, we'd make a mess on console.. ratelimit */ + dev_err_ratelimited(dev, "%s: Failed optimized voltage match for %d\n", + __func__, reference_uv); + return reference_uv; +} + +static int _opp_set_voltage(struct device *dev, + struct dev_pm_opp_supply *supply, + int new_target_uv, struct regulator *reg, + char *reg_name) +{ + int ret; + unsigned long vdd_uv, uv_max; + + if (new_target_uv) + vdd_uv = new_target_uv; + else + vdd_uv = supply->u_volt; + + /* + * If we do have an absolute max voltage specified, then we should + * use that voltage instead to allow for cases where the voltage rails + * are ganged (example if we set the max for an opp as 1.12v, and + * the absolute max is 1.5v, for another rail to get 1.25v, it cannot + * be achieved if the regulator is constrainted to max of 1.12v, even + * if it can function at 1.25v + */ + if (opp_data.vdd_absolute_max_voltage_uv) + uv_max = opp_data.vdd_absolute_max_voltage_uv; + else + uv_max = supply->u_volt_max; + + if (vdd_uv > uv_max || + vdd_uv < supply->u_volt_min || + supply->u_volt_min > uv_max) { + dev_warn(dev, + "Invalid range voltages [Min:%lu target:%lu Max:%lu]\n", + supply->u_volt_min, vdd_uv, uv_max); + return -EINVAL; + } + + dev_dbg(dev, "%s scaling to %luuV[min %luuV max %luuV]\n", reg_name, + vdd_uv, supply->u_volt_min, + uv_max); + + ret = regulator_set_voltage_triplet(reg, + supply->u_volt_min, + vdd_uv, + uv_max); + if (ret) { + dev_err(dev, "%s failed for %luuV[min %luuV max %luuV]\n", + reg_name, vdd_uv, supply->u_volt_min, + uv_max); + return ret; + } + + return 0; +} + +/** + * ti_opp_supply_set_opp() - do the opp supply transition + * @data: information on regulators and new and old opps provided by + * opp core to use in transition + * + * Return: If successful, 0, else appropriate error value. + */ +static int ti_opp_supply_set_opp(struct dev_pm_set_opp_data *data) +{ + struct dev_pm_opp_supply *old_supply_vdd = &data->old_opp.supplies[0]; + struct dev_pm_opp_supply *old_supply_vbb = &data->old_opp.supplies[1]; + struct dev_pm_opp_supply *new_supply_vdd = &data->new_opp.supplies[0]; + struct dev_pm_opp_supply *new_supply_vbb = &data->new_opp.supplies[1]; + struct device *dev = data->dev; + unsigned long old_freq = data->old_opp.rate, freq = data->new_opp.rate; + struct clk *clk = data->clk; + struct regulator *vdd_reg = data->regulators[0]; + struct regulator *vbb_reg = data->regulators[1]; + int vdd_uv; + int ret; + + vdd_uv = _get_optimal_vdd_voltage(dev, &opp_data, + new_supply_vdd->u_volt); + + if (new_supply_vdd->u_volt_min < vdd_uv) + new_supply_vdd->u_volt_min = vdd_uv; + + /* Scaling up? Scale voltage before frequency */ + if (freq > old_freq) { + ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg, + "vdd"); + if (ret) + goto restore_voltage; + + ret = _opp_set_voltage(dev, new_supply_vbb, 0, vbb_reg, "vbb"); + if (ret) + goto restore_voltage; + } + + /* Change frequency */ + dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n", + __func__, old_freq, freq); + + ret = clk_set_rate(clk, freq); + if (ret) { + dev_err(dev, "%s: failed to set clock rate: %d\n", __func__, + ret); + goto restore_voltage; + } + + /* Scaling down? Scale voltage after frequency */ + if (freq < old_freq) { + ret = _opp_set_voltage(dev, new_supply_vbb, 0, vbb_reg, "vbb"); + if (ret) + goto restore_freq; + + ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg, + "vdd"); + if (ret) + goto restore_freq; + } + + return 0; + +restore_freq: + ret = clk_set_rate(clk, old_freq); + if (ret) + 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_vdd->u_volt) { + ret = _opp_set_voltage(dev, old_supply_vbb, 0, vbb_reg, "vbb"); + if (ret) + return ret; + + ret = _opp_set_voltage(dev, old_supply_vdd, 0, vdd_reg, + "vdd"); + if (ret) + return ret; + } + + return ret; +} + +static const struct ti_opp_supply_of_data omap_generic_of_data = { +}; + +static const struct ti_opp_supply_of_data omap_omap5_of_data = { + .flags = OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE, + .efuse_voltage_mask = 0xFFF, + .efuse_voltage_uv = false, +}; + +static const struct ti_opp_supply_of_data omap_omap5core_of_data = { + .flags = OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE | OPPDM_HAS_NO_ABB, + .efuse_voltage_mask = 0xFFF, + .efuse_voltage_uv = false, +}; + +static const struct of_device_id ti_opp_supply_of_match[] = { + {.compatible = "ti,omap-opp-supply", .data = &omap_generic_of_data}, + {.compatible = "ti,omap5-opp-supply", .data = &omap_omap5_of_data}, + {.compatible = "ti,omap5-core-opp-supply", + .data = &omap_omap5core_of_data}, + {}, +}; +MODULE_DEVICE_TABLE(of, ti_opp_supply_of_match); + +static int ti_opp_supply_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device *cpu_dev = get_cpu_device(0); + const struct of_device_id *match; + const struct ti_opp_supply_of_data *of_data; + int ret = 0; + + match = of_match_device(ti_opp_supply_of_match, dev); + if (!match) { + /* We do not expect this to happen */ + dev_err(dev, "%s: Unable to match device\n", __func__); + return -ENODEV; + } + if (!match->data) { + /* Again, unlikely.. but mistakes do happen */ + dev_err(dev, "%s: Bad data in match\n", __func__); + return -EINVAL; + } + of_data = match->data; + + dev_set_drvdata(dev, (void *)of_data); + + /* If we need optimized voltage */ + if (of_data->flags & OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE) { + ret = _store_optimized_voltages(dev, &opp_data); + if (ret) + return ret; + } + + ret = PTR_ERR_OR_ZERO(dev_pm_opp_register_set_opp_helper(cpu_dev, + ti_opp_supply_set_opp)); + if (ret) + _free_optimized_voltages(dev, &opp_data); + + return ret; +} + +static struct platform_driver ti_opp_supply_driver = { + .probe = ti_opp_supply_probe, + .driver = { + .name = "ti_opp_supply", + .of_match_table = of_match_ptr(ti_opp_supply_of_match), + }, +}; +module_platform_driver(ti_opp_supply_driver); + +MODULE_DESCRIPTION("Texas Instruments OMAP OPP Supply driver"); +MODULE_AUTHOR("Texas Instruments Inc."); +MODULE_LICENSE("GPL v2"); |