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![Alexander A. Klimov](/assets/img/avatar_default.png)
Rationale: Reduces attack surface on kernel devs opening the links for MITM as HTTPS traffic is much harder to manipulate. Deterministic algorithm: For each file: If not .svg: For each line: If doesn't contain `\bxmlns\b`: For each link, `\bhttp://[^# \t\r\n]*(?:\w|/)`: If neither `\bgnu\.org/license`, nor `\bmozilla\.org/MPL\b`: If both the HTTP and HTTPS versions return 200 OK and serve the same content: Replace HTTP with HTTPS. Signed-off-by: Alexander A. Klimov <grandmaster@al2klimov.de> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
427 lines
12 KiB
C
427 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2016-2017 Texas Instruments Incorporated - https://www.ti.com/
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* Nishanth Menon <nm@ti.com>
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* Dave Gerlach <d-gerlach@ti.com>
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*
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* TI OPP supply driver that provides override into the regulator control
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* for generic opp core to handle devices with ABB regulator and/or
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* SmartReflex Class0.
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*/
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#include <linux/clk.h>
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#include <linux/cpufreq.h>
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/of_device.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm_opp.h>
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#include <linux/regulator/consumer.h>
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#include <linux/slab.h>
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/**
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* struct ti_opp_supply_optimum_voltage_table - optimized voltage table
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* @reference_uv: reference voltage (usually Nominal voltage)
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* @optimized_uv: Optimized voltage from efuse
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*/
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struct ti_opp_supply_optimum_voltage_table {
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unsigned int reference_uv;
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unsigned int optimized_uv;
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};
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/**
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* struct ti_opp_supply_data - OMAP specific opp supply data
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* @vdd_table: Optimized voltage mapping table
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* @num_vdd_table: number of entries in vdd_table
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* @vdd_absolute_max_voltage_uv: absolute maximum voltage in UV for the supply
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*/
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struct ti_opp_supply_data {
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struct ti_opp_supply_optimum_voltage_table *vdd_table;
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u32 num_vdd_table;
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u32 vdd_absolute_max_voltage_uv;
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};
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static struct ti_opp_supply_data opp_data;
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/**
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* struct ti_opp_supply_of_data - device tree match data
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* @flags: specific type of opp supply
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* @efuse_voltage_mask: mask required for efuse register representing voltage
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* @efuse_voltage_uv: Are the efuse entries in micro-volts? if not, assume
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* milli-volts.
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*/
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struct ti_opp_supply_of_data {
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#define OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE BIT(1)
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#define OPPDM_HAS_NO_ABB BIT(2)
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const u8 flags;
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const u32 efuse_voltage_mask;
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const bool efuse_voltage_uv;
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};
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/**
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* _store_optimized_voltages() - store optimized voltages
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* @dev: ti opp supply device for which we need to store info
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* @data: data specific to the device
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*
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* Picks up efuse based optimized voltages for VDD unique per device and
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* stores it in internal data structure for use during transition requests.
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*
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* Return: If successful, 0, else appropriate error value.
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*/
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static int _store_optimized_voltages(struct device *dev,
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struct ti_opp_supply_data *data)
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{
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void __iomem *base;
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struct property *prop;
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struct resource *res;
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const __be32 *val;
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int proplen, i;
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int ret = 0;
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struct ti_opp_supply_optimum_voltage_table *table;
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const struct ti_opp_supply_of_data *of_data = dev_get_drvdata(dev);
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/* pick up Efuse based voltages */
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res = platform_get_resource(to_platform_device(dev), IORESOURCE_MEM, 0);
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if (!res) {
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dev_err(dev, "Unable to get IO resource\n");
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ret = -ENODEV;
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goto out_map;
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}
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base = ioremap(res->start, resource_size(res));
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if (!base) {
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dev_err(dev, "Unable to map Efuse registers\n");
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ret = -ENOMEM;
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goto out_map;
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}
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/* Fetch efuse-settings. */
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prop = of_find_property(dev->of_node, "ti,efuse-settings", NULL);
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if (!prop) {
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dev_err(dev, "No 'ti,efuse-settings' property found\n");
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ret = -EINVAL;
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goto out;
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}
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proplen = prop->length / sizeof(int);
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data->num_vdd_table = proplen / 2;
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/* Verify for corrupted OPP entries in dt */
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if (data->num_vdd_table * 2 * sizeof(int) != prop->length) {
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dev_err(dev, "Invalid 'ti,efuse-settings'\n");
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ret = -EINVAL;
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goto out;
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}
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ret = of_property_read_u32(dev->of_node, "ti,absolute-max-voltage-uv",
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&data->vdd_absolute_max_voltage_uv);
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if (ret) {
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dev_err(dev, "ti,absolute-max-voltage-uv is missing\n");
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ret = -EINVAL;
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goto out;
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}
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table = kcalloc(data->num_vdd_table, sizeof(*data->vdd_table),
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GFP_KERNEL);
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if (!table) {
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ret = -ENOMEM;
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goto out;
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}
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data->vdd_table = table;
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val = prop->value;
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for (i = 0; i < data->num_vdd_table; i++, table++) {
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u32 efuse_offset;
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u32 tmp;
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table->reference_uv = be32_to_cpup(val++);
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efuse_offset = be32_to_cpup(val++);
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tmp = readl(base + efuse_offset);
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tmp &= of_data->efuse_voltage_mask;
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tmp >>= __ffs(of_data->efuse_voltage_mask);
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table->optimized_uv = of_data->efuse_voltage_uv ? tmp :
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tmp * 1000;
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dev_dbg(dev, "[%d] efuse=0x%08x volt_table=%d vset=%d\n",
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i, efuse_offset, table->reference_uv,
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table->optimized_uv);
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/*
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* Some older samples might not have optimized efuse
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* Use reference voltage for those - just add debug message
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* for them.
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*/
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if (!table->optimized_uv) {
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dev_dbg(dev, "[%d] efuse=0x%08x volt_table=%d:vset0\n",
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i, efuse_offset, table->reference_uv);
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table->optimized_uv = table->reference_uv;
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}
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}
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out:
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iounmap(base);
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out_map:
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return ret;
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}
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/**
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* _free_optimized_voltages() - free resources for optvoltages
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* @dev: device for which we need to free info
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* @data: data specific to the device
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*/
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static void _free_optimized_voltages(struct device *dev,
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struct ti_opp_supply_data *data)
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{
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kfree(data->vdd_table);
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data->vdd_table = NULL;
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data->num_vdd_table = 0;
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}
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/**
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* _get_optimal_vdd_voltage() - Finds optimal voltage for the supply
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* @dev: device for which we need to find info
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* @data: data specific to the device
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* @reference_uv: reference voltage (OPP voltage) for which we need value
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*
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* Return: if a match is found, return optimized voltage, else return
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* reference_uv, also return reference_uv if no optimization is needed.
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*/
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static int _get_optimal_vdd_voltage(struct device *dev,
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struct ti_opp_supply_data *data,
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int reference_uv)
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{
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int i;
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struct ti_opp_supply_optimum_voltage_table *table;
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if (!data->num_vdd_table)
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return reference_uv;
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table = data->vdd_table;
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if (!table)
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return -EINVAL;
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/* Find a exact match - this list is usually very small */
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for (i = 0; i < data->num_vdd_table; i++, table++)
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if (table->reference_uv == reference_uv)
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return table->optimized_uv;
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/* IF things are screwed up, we'd make a mess on console.. ratelimit */
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dev_err_ratelimited(dev, "%s: Failed optimized voltage match for %d\n",
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__func__, reference_uv);
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return reference_uv;
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}
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static int _opp_set_voltage(struct device *dev,
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struct dev_pm_opp_supply *supply,
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int new_target_uv, struct regulator *reg,
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char *reg_name)
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{
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int ret;
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unsigned long vdd_uv, uv_max;
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if (new_target_uv)
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vdd_uv = new_target_uv;
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else
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vdd_uv = supply->u_volt;
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/*
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* If we do have an absolute max voltage specified, then we should
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* use that voltage instead to allow for cases where the voltage rails
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* are ganged (example if we set the max for an opp as 1.12v, and
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* the absolute max is 1.5v, for another rail to get 1.25v, it cannot
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* be achieved if the regulator is constrainted to max of 1.12v, even
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* if it can function at 1.25v
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*/
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if (opp_data.vdd_absolute_max_voltage_uv)
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uv_max = opp_data.vdd_absolute_max_voltage_uv;
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else
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uv_max = supply->u_volt_max;
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if (vdd_uv > uv_max ||
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vdd_uv < supply->u_volt_min ||
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supply->u_volt_min > uv_max) {
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dev_warn(dev,
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"Invalid range voltages [Min:%lu target:%lu Max:%lu]\n",
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supply->u_volt_min, vdd_uv, uv_max);
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return -EINVAL;
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}
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dev_dbg(dev, "%s scaling to %luuV[min %luuV max %luuV]\n", reg_name,
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vdd_uv, supply->u_volt_min,
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uv_max);
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ret = regulator_set_voltage_triplet(reg,
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supply->u_volt_min,
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vdd_uv,
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uv_max);
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if (ret) {
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dev_err(dev, "%s failed for %luuV[min %luuV max %luuV]\n",
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reg_name, vdd_uv, supply->u_volt_min,
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uv_max);
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return ret;
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}
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return 0;
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}
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/**
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* ti_opp_supply_set_opp() - do the opp supply transition
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* @data: information on regulators and new and old opps provided by
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* opp core to use in transition
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*
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* Return: If successful, 0, else appropriate error value.
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*/
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static int ti_opp_supply_set_opp(struct dev_pm_set_opp_data *data)
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{
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struct dev_pm_opp_supply *old_supply_vdd = &data->old_opp.supplies[0];
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struct dev_pm_opp_supply *old_supply_vbb = &data->old_opp.supplies[1];
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struct dev_pm_opp_supply *new_supply_vdd = &data->new_opp.supplies[0];
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struct dev_pm_opp_supply *new_supply_vbb = &data->new_opp.supplies[1];
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struct device *dev = data->dev;
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unsigned long old_freq = data->old_opp.rate, freq = data->new_opp.rate;
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struct clk *clk = data->clk;
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struct regulator *vdd_reg = data->regulators[0];
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struct regulator *vbb_reg = data->regulators[1];
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int vdd_uv;
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int ret;
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vdd_uv = _get_optimal_vdd_voltage(dev, &opp_data,
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new_supply_vdd->u_volt);
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if (new_supply_vdd->u_volt_min < vdd_uv)
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new_supply_vdd->u_volt_min = vdd_uv;
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/* Scaling up? Scale voltage before frequency */
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if (freq > old_freq) {
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ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg,
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"vdd");
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if (ret)
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goto restore_voltage;
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ret = _opp_set_voltage(dev, new_supply_vbb, 0, vbb_reg, "vbb");
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if (ret)
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goto restore_voltage;
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}
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/* Change frequency */
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dev_dbg(dev, "%s: switching OPP: %lu Hz --> %lu Hz\n",
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__func__, old_freq, freq);
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ret = clk_set_rate(clk, freq);
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if (ret) {
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dev_err(dev, "%s: failed to set clock rate: %d\n", __func__,
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ret);
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goto restore_voltage;
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}
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/* Scaling down? Scale voltage after frequency */
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if (freq < old_freq) {
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ret = _opp_set_voltage(dev, new_supply_vbb, 0, vbb_reg, "vbb");
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if (ret)
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goto restore_freq;
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ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg,
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"vdd");
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if (ret)
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goto restore_freq;
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}
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return 0;
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restore_freq:
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ret = clk_set_rate(clk, old_freq);
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if (ret)
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dev_err(dev, "%s: failed to restore old-freq (%lu Hz)\n",
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__func__, old_freq);
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restore_voltage:
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/* This shouldn't harm even if the voltages weren't updated earlier */
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if (old_supply_vdd->u_volt) {
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ret = _opp_set_voltage(dev, old_supply_vbb, 0, vbb_reg, "vbb");
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if (ret)
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return ret;
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ret = _opp_set_voltage(dev, old_supply_vdd, 0, vdd_reg,
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"vdd");
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if (ret)
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return ret;
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}
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return ret;
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}
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static const struct ti_opp_supply_of_data omap_generic_of_data = {
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};
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static const struct ti_opp_supply_of_data omap_omap5_of_data = {
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.flags = OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE,
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.efuse_voltage_mask = 0xFFF,
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.efuse_voltage_uv = false,
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};
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static const struct ti_opp_supply_of_data omap_omap5core_of_data = {
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.flags = OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE | OPPDM_HAS_NO_ABB,
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.efuse_voltage_mask = 0xFFF,
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.efuse_voltage_uv = false,
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};
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static const struct of_device_id ti_opp_supply_of_match[] = {
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{.compatible = "ti,omap-opp-supply", .data = &omap_generic_of_data},
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{.compatible = "ti,omap5-opp-supply", .data = &omap_omap5_of_data},
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{.compatible = "ti,omap5-core-opp-supply",
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.data = &omap_omap5core_of_data},
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{},
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};
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MODULE_DEVICE_TABLE(of, ti_opp_supply_of_match);
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static int ti_opp_supply_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device *cpu_dev = get_cpu_device(0);
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const struct of_device_id *match;
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const struct ti_opp_supply_of_data *of_data;
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int ret = 0;
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match = of_match_device(ti_opp_supply_of_match, dev);
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if (!match) {
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/* We do not expect this to happen */
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dev_err(dev, "%s: Unable to match device\n", __func__);
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return -ENODEV;
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}
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if (!match->data) {
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/* Again, unlikely.. but mistakes do happen */
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dev_err(dev, "%s: Bad data in match\n", __func__);
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return -EINVAL;
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}
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of_data = match->data;
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dev_set_drvdata(dev, (void *)of_data);
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/* If we need optimized voltage */
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if (of_data->flags & OPPDM_EFUSE_CLASS0_OPTIMIZED_VOLTAGE) {
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ret = _store_optimized_voltages(dev, &opp_data);
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if (ret)
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return ret;
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}
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ret = PTR_ERR_OR_ZERO(dev_pm_opp_register_set_opp_helper(cpu_dev,
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ti_opp_supply_set_opp));
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if (ret)
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_free_optimized_voltages(dev, &opp_data);
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return ret;
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}
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static struct platform_driver ti_opp_supply_driver = {
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.probe = ti_opp_supply_probe,
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.driver = {
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.name = "ti_opp_supply",
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.of_match_table = of_match_ptr(ti_opp_supply_of_match),
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},
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};
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module_platform_driver(ti_opp_supply_driver);
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MODULE_DESCRIPTION("Texas Instruments OMAP OPP Supply driver");
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MODULE_AUTHOR("Texas Instruments Inc.");
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MODULE_LICENSE("GPL v2");
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