462 lines
12 KiB
C
462 lines
12 KiB
C
// 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 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, },
|
|
/* 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 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");
|