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kernel/drivers/cpufreq/ti-cpufreq.c
Gustavo A. R. Silva df561f6688 treewide: Use fallthrough pseudo-keyword 
Replace the existing /* fall through */ comments and its variants with
the new pseudo-keyword macro fallthrough[1]. Also, remove unnecessary
fall-through markings when it is the case.

[1] https://www.kernel.org/doc/html/v5.7/process/deprecated.html?highlight=fallthrough#implicit-switch-case-fall-through

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
2020-08-23 17:36:59 -05:00

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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/of_platform.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 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;
struct opp_table *opp_table;
};
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 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"};
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,
};
/**
* 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, },
/* 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;
const struct of_device_id *match;
np = of_find_node_by_path("/");
match = of_match_node(ti_cpufreq_of_match, np);
of_node_put(np);
return match;
}
static int ti_cpufreq_probe(struct platform_device *pdev)
{
u32 version[VERSION_COUNT];
const struct of_device_id *match;
struct opp_table *ti_opp_table;
struct ti_cpufreq_data *opp_data;
const char * const default_reg_names[] = {"vdd", "vbb"};
int ret;
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;
ti_opp_table = dev_pm_opp_set_supported_hw(opp_data->cpu_dev,
version, VERSION_COUNT);
if (IS_ERR(ti_opp_table)) {
dev_err(opp_data->cpu_dev,
"Failed to set supported hardware\n");
ret = PTR_ERR(ti_opp_table);
goto fail_put_node;
}
opp_data->opp_table = ti_opp_table;
if (opp_data->soc_data->multi_regulator) {
const char * const *reg_names = default_reg_names;
if (opp_data->soc_data->reg_names)
reg_names = opp_data->soc_data->reg_names;
ti_opp_table = dev_pm_opp_set_regulators(opp_data->cpu_dev,
reg_names,
ARRAY_SIZE(default_reg_names));
if (IS_ERR(ti_opp_table)) {
dev_pm_opp_put_supported_hw(opp_data->opp_table);
ret = PTR_ERR(ti_opp_table);
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 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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