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linux/drivers/cpufreq/ti-cpufreq.c
Shivani Gupta d769eaef2a cpufreq: ti: Implement scope-based cleanup in ti_cpufreq_match_node() 
Modify the ti_cpufreq_match_node() function to utilize the __free()
cleanup handler for automatically releasing the device node when it goes
out of scope.

By moving the declaration to the initialization, the patch ensures that
the device node is properly managed throughout the function's scope,
thus eliminating the need for manual invocation of of_node_put().
This approach reduces the potential for memory leaks.

Suggested-by: Julia Lawall <julia.lawall@inria.fr>
Signed-off-by: Shivani Gupta <shivani07g@gmail.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
2024-04-23 12:51:46 +05:30

462 lines
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// SPDX-License-Identifier: GPL-2.0-only
/*
* TI CPUFreq/OPP hw-supported driver
*
* Copyright (C) 2016-2017 Texas Instruments, Inc.
* Dave Gerlach <d-gerlach@ti.com>
*/
#include <linux/cpu.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#define REVISION_MASK 0xF
#define REVISION_SHIFT 28
#define AM33XX_800M_ARM_MPU_MAX_FREQ 0x1E2F
#define AM43XX_600M_ARM_MPU_MAX_FREQ 0xFFA
#define DRA7_EFUSE_HAS_OD_MPU_OPP 11
#define DRA7_EFUSE_HAS_HIGH_MPU_OPP 15
#define DRA76_EFUSE_HAS_PLUS_MPU_OPP 18
#define DRA7_EFUSE_HAS_ALL_MPU_OPP 23
#define DRA76_EFUSE_HAS_ALL_MPU_OPP 24
#define DRA7_EFUSE_NOM_MPU_OPP BIT(0)
#define DRA7_EFUSE_OD_MPU_OPP BIT(1)
#define DRA7_EFUSE_HIGH_MPU_OPP BIT(2)
#define DRA76_EFUSE_PLUS_MPU_OPP BIT(3)
#define OMAP3_CONTROL_DEVICE_STATUS 0x4800244C
#define OMAP3_CONTROL_IDCODE 0x4830A204
#define OMAP34xx_ProdID_SKUID 0x4830A20C
#define OMAP3_SYSCON_BASE (0x48000000 + 0x2000 + 0x270)
#define AM625_EFUSE_K_MPU_OPP 11
#define AM625_EFUSE_S_MPU_OPP 19
#define AM625_EFUSE_T_MPU_OPP 20
#define AM625_SUPPORT_K_MPU_OPP BIT(0)
#define AM625_SUPPORT_S_MPU_OPP BIT(1)
#define AM625_SUPPORT_T_MPU_OPP BIT(2)
#define VERSION_COUNT 2
struct ti_cpufreq_data;
struct ti_cpufreq_soc_data {
const char * const *reg_names;
unsigned long (*efuse_xlate)(struct ti_cpufreq_data *opp_data,
unsigned long efuse);
unsigned long efuse_fallback;
unsigned long efuse_offset;
unsigned long efuse_mask;
unsigned long efuse_shift;
unsigned long rev_offset;
bool multi_regulator;
};
struct ti_cpufreq_data {
struct device *cpu_dev;
struct device_node *opp_node;
struct regmap *syscon;
const struct ti_cpufreq_soc_data *soc_data;
};
static unsigned long amx3_efuse_xlate(struct ti_cpufreq_data *opp_data,
unsigned long efuse)
{
if (!efuse)
efuse = opp_data->soc_data->efuse_fallback;
/* AM335x and AM437x use "OPP disable" bits, so invert */
return ~efuse;
}
static unsigned long dra7_efuse_xlate(struct ti_cpufreq_data *opp_data,
unsigned long efuse)
{
unsigned long calculated_efuse = DRA7_EFUSE_NOM_MPU_OPP;
/*
* The efuse on dra7 and am57 parts contains a specific
* value indicating the highest available OPP.
*/
switch (efuse) {
case DRA76_EFUSE_HAS_PLUS_MPU_OPP:
case DRA76_EFUSE_HAS_ALL_MPU_OPP:
calculated_efuse |= DRA76_EFUSE_PLUS_MPU_OPP;
fallthrough;
case DRA7_EFUSE_HAS_ALL_MPU_OPP:
case DRA7_EFUSE_HAS_HIGH_MPU_OPP:
calculated_efuse |= DRA7_EFUSE_HIGH_MPU_OPP;
fallthrough;
case DRA7_EFUSE_HAS_OD_MPU_OPP:
calculated_efuse |= DRA7_EFUSE_OD_MPU_OPP;
}
return calculated_efuse;
}
static unsigned long omap3_efuse_xlate(struct ti_cpufreq_data *opp_data,
unsigned long efuse)
{
/* OPP enable bit ("Speed Binned") */
return BIT(efuse);
}
static unsigned long am625_efuse_xlate(struct ti_cpufreq_data *opp_data,
unsigned long efuse)
{
unsigned long calculated_efuse = AM625_SUPPORT_K_MPU_OPP;
switch (efuse) {
case AM625_EFUSE_T_MPU_OPP:
calculated_efuse |= AM625_SUPPORT_T_MPU_OPP;
fallthrough;
case AM625_EFUSE_S_MPU_OPP:
calculated_efuse |= AM625_SUPPORT_S_MPU_OPP;
fallthrough;
case AM625_EFUSE_K_MPU_OPP:
calculated_efuse |= AM625_SUPPORT_K_MPU_OPP;
}
return calculated_efuse;
}
static struct ti_cpufreq_soc_data am3x_soc_data = {
.efuse_xlate = amx3_efuse_xlate,
.efuse_fallback = AM33XX_800M_ARM_MPU_MAX_FREQ,
.efuse_offset = 0x07fc,
.efuse_mask = 0x1fff,
.rev_offset = 0x600,
.multi_regulator = false,
};
static struct ti_cpufreq_soc_data am4x_soc_data = {
.efuse_xlate = amx3_efuse_xlate,
.efuse_fallback = AM43XX_600M_ARM_MPU_MAX_FREQ,
.efuse_offset = 0x0610,
.efuse_mask = 0x3f,
.rev_offset = 0x600,
.multi_regulator = false,
};
static struct ti_cpufreq_soc_data dra7_soc_data = {
.efuse_xlate = dra7_efuse_xlate,
.efuse_offset = 0x020c,
.efuse_mask = 0xf80000,
.efuse_shift = 19,
.rev_offset = 0x204,
.multi_regulator = true,
};
/*
* OMAP35x TRM (SPRUF98K):
* CONTROL_IDCODE (0x4830 A204) describes Silicon revisions.
* Control OMAP Status Register 15:0 (Address 0x4800 244C)
* to separate between omap3503, omap3515, omap3525, omap3530
* and feature presence.
* There are encodings for versions limited to 400/266MHz
* but we ignore.
* Not clear if this also holds for omap34xx.
* some eFuse values e.g. CONTROL_FUSE_OPP1_VDD1
* are stored in the SYSCON register range
* Register 0x4830A20C [ProdID.SKUID] [0:3]
* 0x0 for normal 600/430MHz device.
* 0x8 for 720/520MHz device.
* Not clear what omap34xx value is.
*/
static struct ti_cpufreq_soc_data omap34xx_soc_data = {
.efuse_xlate = omap3_efuse_xlate,
.efuse_offset = OMAP34xx_ProdID_SKUID - OMAP3_SYSCON_BASE,
.efuse_shift = 3,
.efuse_mask = BIT(3),
.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
.multi_regulator = false,
};
/*
* AM/DM37x TRM (SPRUGN4M)
* CONTROL_IDCODE (0x4830 A204) describes Silicon revisions.
* Control Device Status Register 15:0 (Address 0x4800 244C)
* to separate between am3703, am3715, dm3725, dm3730
* and feature presence.
* Speed Binned = Bit 9
* 0 800/600 MHz
* 1 1000/800 MHz
* some eFuse values e.g. CONTROL_FUSE_OPP 1G_VDD1
* are stored in the SYSCON register range.
* There is no 0x4830A20C [ProdID.SKUID] register (exists but
* seems to always read as 0).
*/
static const char * const omap3_reg_names[] = {"cpu0", "vbb", NULL};
static struct ti_cpufreq_soc_data omap36xx_soc_data = {
.reg_names = omap3_reg_names,
.efuse_xlate = omap3_efuse_xlate,
.efuse_offset = OMAP3_CONTROL_DEVICE_STATUS - OMAP3_SYSCON_BASE,
.efuse_shift = 9,
.efuse_mask = BIT(9),
.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
.multi_regulator = true,
};
/*
* AM3517 is quite similar to AM/DM37x except that it has no
* high speed grade eFuse and no abb ldo
*/
static struct ti_cpufreq_soc_data am3517_soc_data = {
.efuse_xlate = omap3_efuse_xlate,
.efuse_offset = OMAP3_CONTROL_DEVICE_STATUS - OMAP3_SYSCON_BASE,
.efuse_shift = 0,
.efuse_mask = 0,
.rev_offset = OMAP3_CONTROL_IDCODE - OMAP3_SYSCON_BASE,
.multi_regulator = false,
};
static struct ti_cpufreq_soc_data am625_soc_data = {
.efuse_xlate = am625_efuse_xlate,
.efuse_offset = 0x0018,
.efuse_mask = 0x07c0,
.efuse_shift = 0x6,
.rev_offset = 0x0014,
.multi_regulator = false,
};
/**
* ti_cpufreq_get_efuse() - Parse and return efuse value present on SoC
* @opp_data: pointer to ti_cpufreq_data context
* @efuse_value: Set to the value parsed from efuse
*
* Returns error code if efuse not read properly.
*/
static int ti_cpufreq_get_efuse(struct ti_cpufreq_data *opp_data,
u32 *efuse_value)
{
struct device *dev = opp_data->cpu_dev;
u32 efuse;
int ret;
ret = regmap_read(opp_data->syscon, opp_data->soc_data->efuse_offset,
&efuse);
if (ret == -EIO) {
/* not a syscon register! */
void __iomem *regs = ioremap(OMAP3_SYSCON_BASE +
opp_data->soc_data->efuse_offset, 4);
if (!regs)
return -ENOMEM;
efuse = readl(regs);
iounmap(regs);
}
else if (ret) {
dev_err(dev,
"Failed to read the efuse value from syscon: %d\n",
ret);
return ret;
}
efuse = (efuse & opp_data->soc_data->efuse_mask);
efuse >>= opp_data->soc_data->efuse_shift;
*efuse_value = opp_data->soc_data->efuse_xlate(opp_data, efuse);
return 0;
}
/**
* ti_cpufreq_get_rev() - Parse and return rev value present on SoC
* @opp_data: pointer to ti_cpufreq_data context
* @revision_value: Set to the value parsed from revision register
*
* Returns error code if revision not read properly.
*/
static int ti_cpufreq_get_rev(struct ti_cpufreq_data *opp_data,
u32 *revision_value)
{
struct device *dev = opp_data->cpu_dev;
u32 revision;
int ret;
ret = regmap_read(opp_data->syscon, opp_data->soc_data->rev_offset,
&revision);
if (ret == -EIO) {
/* not a syscon register! */
void __iomem *regs = ioremap(OMAP3_SYSCON_BASE +
opp_data->soc_data->rev_offset, 4);
if (!regs)
return -ENOMEM;
revision = readl(regs);
iounmap(regs);
}
else if (ret) {
dev_err(dev,
"Failed to read the revision number from syscon: %d\n",
ret);
return ret;
}
*revision_value = BIT((revision >> REVISION_SHIFT) & REVISION_MASK);
return 0;
}
static int ti_cpufreq_setup_syscon_register(struct ti_cpufreq_data *opp_data)
{
struct device *dev = opp_data->cpu_dev;
struct device_node *np = opp_data->opp_node;
opp_data->syscon = syscon_regmap_lookup_by_phandle(np,
"syscon");
if (IS_ERR(opp_data->syscon)) {
dev_err(dev,
"\"syscon\" is missing, cannot use OPPv2 table.\n");
return PTR_ERR(opp_data->syscon);
}
return 0;
}
static const struct of_device_id ti_cpufreq_of_match[] = {
{ .compatible = "ti,am33xx", .data = &am3x_soc_data, },
{ .compatible = "ti,am3517", .data = &am3517_soc_data, },
{ .compatible = "ti,am43", .data = &am4x_soc_data, },
{ .compatible = "ti,dra7", .data = &dra7_soc_data },
{ .compatible = "ti,omap34xx", .data = &omap34xx_soc_data, },
{ .compatible = "ti,omap36xx", .data = &omap36xx_soc_data, },
{ .compatible = "ti,am625", .data = &am625_soc_data, },
{ .compatible = "ti,am62a7", .data = &am625_soc_data, },
{ .compatible = "ti,am62p5", .data = &am625_soc_data, },
/* legacy */
{ .compatible = "ti,omap3430", .data = &omap34xx_soc_data, },
{ .compatible = "ti,omap3630", .data = &omap36xx_soc_data, },
{},
};
static const struct of_device_id *ti_cpufreq_match_node(void)
{
struct device_node *np __free(device_node) = of_find_node_by_path("/");
const struct of_device_id *match;
match = of_match_node(ti_cpufreq_of_match, np);
return match;
}
static int ti_cpufreq_probe(struct platform_device *pdev)
{
u32 version[VERSION_COUNT];
const struct of_device_id *match;
struct ti_cpufreq_data *opp_data;
const char * const default_reg_names[] = {"vdd", "vbb", NULL};
int ret;
struct dev_pm_opp_config config = {
.supported_hw = version,
.supported_hw_count = ARRAY_SIZE(version),
};
match = dev_get_platdata(&pdev->dev);
if (!match)
return -ENODEV;
opp_data = devm_kzalloc(&pdev->dev, sizeof(*opp_data), GFP_KERNEL);
if (!opp_data)
return -ENOMEM;
opp_data->soc_data = match->data;
opp_data->cpu_dev = get_cpu_device(0);
if (!opp_data->cpu_dev) {
pr_err("%s: Failed to get device for CPU0\n", __func__);
return -ENODEV;
}
opp_data->opp_node = dev_pm_opp_of_get_opp_desc_node(opp_data->cpu_dev);
if (!opp_data->opp_node) {
dev_info(opp_data->cpu_dev,
"OPP-v2 not supported, cpufreq-dt will attempt to use legacy tables.\n");
goto register_cpufreq_dt;
}
ret = ti_cpufreq_setup_syscon_register(opp_data);
if (ret)
goto fail_put_node;
/*
* OPPs determine whether or not they are supported based on
* two metrics:
* 0 - SoC Revision
* 1 - eFuse value
*/
ret = ti_cpufreq_get_rev(opp_data, &version[0]);
if (ret)
goto fail_put_node;
ret = ti_cpufreq_get_efuse(opp_data, &version[1]);
if (ret)
goto fail_put_node;
if (opp_data->soc_data->multi_regulator) {
if (opp_data->soc_data->reg_names)
config.regulator_names = opp_data->soc_data->reg_names;
else
config.regulator_names = default_reg_names;
}
ret = dev_pm_opp_set_config(opp_data->cpu_dev, &config);
if (ret < 0) {
dev_err(opp_data->cpu_dev, "Failed to set OPP config\n");
goto fail_put_node;
}
of_node_put(opp_data->opp_node);
register_cpufreq_dt:
platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
return 0;
fail_put_node:
of_node_put(opp_data->opp_node);
return ret;
}
static int __init ti_cpufreq_init(void)
{
const struct of_device_id *match;
/* Check to ensure we are on a compatible platform */
match = ti_cpufreq_match_node();
if (match)
platform_device_register_data(NULL, "ti-cpufreq", -1, match,
sizeof(*match));
return 0;
}
module_init(ti_cpufreq_init);
static struct platform_driver ti_cpufreq_driver = {
.probe = ti_cpufreq_probe,
.driver = {
.name = "ti-cpufreq",
},
};
builtin_platform_driver(ti_cpufreq_driver);
MODULE_DESCRIPTION("TI CPUFreq/OPP hw-supported driver");
MODULE_AUTHOR("Dave Gerlach <d-gerlach@ti.com>");
MODULE_LICENSE("GPL v2");
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