Author | Tokens | Token Proportion | Commits | Commit Proportion |
---|---|---|---|---|
Dave Gerlach | 1580 | 98.69% | 1 | 20.00% |
J Keerthy | 15 | 0.94% | 2 | 40.00% |
Kees Cook | 5 | 0.31% | 1 | 20.00% |
Wei Yongjun | 1 | 0.06% | 1 | 20.00% |
Total | 1601 | 5 |
// SPDX-License-Identifier: GPL-2.0 /* * Copyright (C) 2016-2017 Texas Instruments Incorporated - http://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_nocache(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");
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