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![Dave Gerlach](/assets/img/avatar_default.png)
Currently the ti-cpufreq driver blindly registers a 'ti-cpufreq' to force the driver to probe on any platforms where the driver is built in. However, this should only happen on platforms that actually can make use of the driver. There is already functionality in place to match the SoC compatible so let's factor this out into a separate call and make sure we find a match before creating the ti-cpufreq platform device. Reviewed-by: Johan Hovold <johan@kernel.org> Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
324 lines
8 KiB
C
324 lines
8 KiB
C
/*
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* TI CPUFreq/OPP hw-supported driver
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*
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* Copyright (C) 2016-2017 Texas Instruments, Inc.
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* Dave Gerlach <d-gerlach@ti.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/cpu.h>
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#include <linux/io.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/pm_opp.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#define REVISION_MASK 0xF
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#define REVISION_SHIFT 28
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#define AM33XX_800M_ARM_MPU_MAX_FREQ 0x1E2F
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#define AM43XX_600M_ARM_MPU_MAX_FREQ 0xFFA
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#define DRA7_EFUSE_HAS_OD_MPU_OPP 11
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#define DRA7_EFUSE_HAS_HIGH_MPU_OPP 15
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#define DRA7_EFUSE_HAS_ALL_MPU_OPP 23
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#define DRA7_EFUSE_NOM_MPU_OPP BIT(0)
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#define DRA7_EFUSE_OD_MPU_OPP BIT(1)
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#define DRA7_EFUSE_HIGH_MPU_OPP BIT(2)
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#define VERSION_COUNT 2
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struct ti_cpufreq_data;
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struct ti_cpufreq_soc_data {
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unsigned long (*efuse_xlate)(struct ti_cpufreq_data *opp_data,
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unsigned long efuse);
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unsigned long efuse_fallback;
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unsigned long efuse_offset;
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unsigned long efuse_mask;
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unsigned long efuse_shift;
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unsigned long rev_offset;
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bool multi_regulator;
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};
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struct ti_cpufreq_data {
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struct device *cpu_dev;
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struct device_node *opp_node;
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struct regmap *syscon;
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const struct ti_cpufreq_soc_data *soc_data;
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struct opp_table *opp_table;
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};
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static unsigned long amx3_efuse_xlate(struct ti_cpufreq_data *opp_data,
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unsigned long efuse)
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{
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if (!efuse)
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efuse = opp_data->soc_data->efuse_fallback;
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/* AM335x and AM437x use "OPP disable" bits, so invert */
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return ~efuse;
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}
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static unsigned long dra7_efuse_xlate(struct ti_cpufreq_data *opp_data,
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unsigned long efuse)
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{
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unsigned long calculated_efuse = DRA7_EFUSE_NOM_MPU_OPP;
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/*
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* The efuse on dra7 and am57 parts contains a specific
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* value indicating the highest available OPP.
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*/
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switch (efuse) {
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case DRA7_EFUSE_HAS_ALL_MPU_OPP:
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case DRA7_EFUSE_HAS_HIGH_MPU_OPP:
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calculated_efuse |= DRA7_EFUSE_HIGH_MPU_OPP;
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case DRA7_EFUSE_HAS_OD_MPU_OPP:
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calculated_efuse |= DRA7_EFUSE_OD_MPU_OPP;
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}
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return calculated_efuse;
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}
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static struct ti_cpufreq_soc_data am3x_soc_data = {
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.efuse_xlate = amx3_efuse_xlate,
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.efuse_fallback = AM33XX_800M_ARM_MPU_MAX_FREQ,
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.efuse_offset = 0x07fc,
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.efuse_mask = 0x1fff,
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.rev_offset = 0x600,
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.multi_regulator = false,
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};
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static struct ti_cpufreq_soc_data am4x_soc_data = {
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.efuse_xlate = amx3_efuse_xlate,
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.efuse_fallback = AM43XX_600M_ARM_MPU_MAX_FREQ,
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.efuse_offset = 0x0610,
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.efuse_mask = 0x3f,
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.rev_offset = 0x600,
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.multi_regulator = false,
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};
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static struct ti_cpufreq_soc_data dra7_soc_data = {
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.efuse_xlate = dra7_efuse_xlate,
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.efuse_offset = 0x020c,
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.efuse_mask = 0xf80000,
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.efuse_shift = 19,
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.rev_offset = 0x204,
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.multi_regulator = true,
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};
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/**
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* ti_cpufreq_get_efuse() - Parse and return efuse value present on SoC
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* @opp_data: pointer to ti_cpufreq_data context
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* @efuse_value: Set to the value parsed from efuse
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*
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* Returns error code if efuse not read properly.
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*/
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static int ti_cpufreq_get_efuse(struct ti_cpufreq_data *opp_data,
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u32 *efuse_value)
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{
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struct device *dev = opp_data->cpu_dev;
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u32 efuse;
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int ret;
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ret = regmap_read(opp_data->syscon, opp_data->soc_data->efuse_offset,
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&efuse);
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if (ret) {
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dev_err(dev,
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"Failed to read the efuse value from syscon: %d\n",
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ret);
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return ret;
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}
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efuse = (efuse & opp_data->soc_data->efuse_mask);
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efuse >>= opp_data->soc_data->efuse_shift;
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*efuse_value = opp_data->soc_data->efuse_xlate(opp_data, efuse);
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return 0;
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}
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/**
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* ti_cpufreq_get_rev() - Parse and return rev value present on SoC
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* @opp_data: pointer to ti_cpufreq_data context
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* @revision_value: Set to the value parsed from revision register
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*
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* Returns error code if revision not read properly.
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*/
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static int ti_cpufreq_get_rev(struct ti_cpufreq_data *opp_data,
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u32 *revision_value)
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{
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struct device *dev = opp_data->cpu_dev;
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u32 revision;
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int ret;
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ret = regmap_read(opp_data->syscon, opp_data->soc_data->rev_offset,
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&revision);
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if (ret) {
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dev_err(dev,
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"Failed to read the revision number from syscon: %d\n",
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ret);
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return ret;
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}
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*revision_value = BIT((revision >> REVISION_SHIFT) & REVISION_MASK);
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return 0;
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}
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static int ti_cpufreq_setup_syscon_register(struct ti_cpufreq_data *opp_data)
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{
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struct device *dev = opp_data->cpu_dev;
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struct device_node *np = opp_data->opp_node;
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opp_data->syscon = syscon_regmap_lookup_by_phandle(np,
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"syscon");
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if (IS_ERR(opp_data->syscon)) {
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dev_err(dev,
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"\"syscon\" is missing, cannot use OPPv2 table.\n");
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return PTR_ERR(opp_data->syscon);
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}
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return 0;
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}
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static const struct of_device_id ti_cpufreq_of_match[] = {
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{ .compatible = "ti,am33xx", .data = &am3x_soc_data, },
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{ .compatible = "ti,am43", .data = &am4x_soc_data, },
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{ .compatible = "ti,dra7", .data = &dra7_soc_data },
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{},
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};
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static const struct of_device_id *ti_cpufreq_match_node(void)
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{
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struct device_node *np;
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const struct of_device_id *match;
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np = of_find_node_by_path("/");
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match = of_match_node(ti_cpufreq_of_match, np);
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of_node_put(np);
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return match;
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}
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static int ti_cpufreq_probe(struct platform_device *pdev)
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{
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u32 version[VERSION_COUNT];
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const struct of_device_id *match;
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struct opp_table *ti_opp_table;
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struct ti_cpufreq_data *opp_data;
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const char * const reg_names[] = {"vdd", "vbb"};
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int ret;
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match = dev_get_platdata(&pdev->dev);
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if (!match)
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return -ENODEV;
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opp_data = devm_kzalloc(&pdev->dev, sizeof(*opp_data), GFP_KERNEL);
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if (!opp_data)
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return -ENOMEM;
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opp_data->soc_data = match->data;
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opp_data->cpu_dev = get_cpu_device(0);
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if (!opp_data->cpu_dev) {
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pr_err("%s: Failed to get device for CPU0\n", __func__);
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return -ENODEV;
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}
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opp_data->opp_node = dev_pm_opp_of_get_opp_desc_node(opp_data->cpu_dev);
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if (!opp_data->opp_node) {
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dev_info(opp_data->cpu_dev,
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"OPP-v2 not supported, cpufreq-dt will attempt to use legacy tables.\n");
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goto register_cpufreq_dt;
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}
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ret = ti_cpufreq_setup_syscon_register(opp_data);
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if (ret)
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goto fail_put_node;
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/*
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* OPPs determine whether or not they are supported based on
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* two metrics:
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* 0 - SoC Revision
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* 1 - eFuse value
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*/
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ret = ti_cpufreq_get_rev(opp_data, &version[0]);
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if (ret)
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goto fail_put_node;
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ret = ti_cpufreq_get_efuse(opp_data, &version[1]);
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if (ret)
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goto fail_put_node;
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ti_opp_table = dev_pm_opp_set_supported_hw(opp_data->cpu_dev,
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version, VERSION_COUNT);
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if (IS_ERR(ti_opp_table)) {
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dev_err(opp_data->cpu_dev,
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"Failed to set supported hardware\n");
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ret = PTR_ERR(ti_opp_table);
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goto fail_put_node;
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}
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opp_data->opp_table = ti_opp_table;
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if (opp_data->soc_data->multi_regulator) {
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ti_opp_table = dev_pm_opp_set_regulators(opp_data->cpu_dev,
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reg_names,
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ARRAY_SIZE(reg_names));
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if (IS_ERR(ti_opp_table)) {
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dev_pm_opp_put_supported_hw(opp_data->opp_table);
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ret = PTR_ERR(ti_opp_table);
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goto fail_put_node;
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}
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}
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of_node_put(opp_data->opp_node);
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register_cpufreq_dt:
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platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
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return 0;
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fail_put_node:
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of_node_put(opp_data->opp_node);
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return ret;
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}
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static int ti_cpufreq_init(void)
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{
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const struct of_device_id *match;
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/* Check to ensure we are on a compatible platform */
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match = ti_cpufreq_match_node();
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if (match)
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platform_device_register_data(NULL, "ti-cpufreq", -1, match,
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sizeof(*match));
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return 0;
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}
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module_init(ti_cpufreq_init);
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static struct platform_driver ti_cpufreq_driver = {
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.probe = ti_cpufreq_probe,
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.driver = {
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.name = "ti-cpufreq",
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},
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};
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builtin_platform_driver(ti_cpufreq_driver);
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MODULE_DESCRIPTION("TI CPUFreq/OPP hw-supported driver");
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MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
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MODULE_LICENSE("GPL v2");
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