// 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>
#include <linux/sys_soc.h>
#define REVISION_MASK 0 xF
#define REVISION_SHIFT 28
#define AM33XX_800M_ARM_MPU_MAX_FREQ 0 x1E2F
#define AM43XX_600M_ARM_MPU_MAX_FREQ 0 xFFA
#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 0 x4800244C
#define OMAP3_CONTROL_IDCODE 0 x4830A204
#define OMAP34xx_ProdID_SKUID 0 x4830A20C
#define OMAP3_SYSCON_BASE (0 x48000000 + 0 x2000 + 0 x270)
#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 )
enum {
AM62A7_EFUSE_M_MPU_OPP = 13 ,
AM62A7_EFUSE_N_MPU_OPP,
AM62A7_EFUSE_O_MPU_OPP,
AM62A7_EFUSE_P_MPU_OPP,
AM62A7_EFUSE_Q_MPU_OPP,
AM62A7_EFUSE_R_MPU_OPP,
AM62A7_EFUSE_S_MPU_OPP,
/*
* The V , U , and T speed grade numbering is out of order
* to align with the AM625 more uniformly . I promise I know
* my ABCs ; )
*/
AM62A7_EFUSE_V_MPU_OPP,
AM62A7_EFUSE_U_MPU_OPP,
AM62A7_EFUSE_T_MPU_OPP,
};
#define AM62A7_SUPPORT_N_MPU_OPP BIT(0 )
#define AM62A7_SUPPORT_R_MPU_OPP BIT(1 )
#define AM62A7_SUPPORT_V_MPU_OPP BIT(2 )
#define AM62P5_EFUSE_O_MPU_OPP 15
#define AM62P5_EFUSE_S_MPU_OPP 19
#define AM62P5_EFUSE_U_MPU_OPP 21
#define AM62P5_SUPPORT_O_MPU_OPP BIT(0 )
#define AM62P5_SUPPORT_U_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;
/* Backward compatibility hack: Might have missing syscon */
#define TI_QUIRK_SYSCON_MAY_BE_MISSING 0 x1
/* Backward compatibility hack: new syscon size is 1 register wide */
#define TI_QUIRK_SYSCON_IS_SINGLE_REG 0 x2
u8 quirks;
};
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 am62p5_efuse_xlate(struct ti_cpufreq_data *opp_data,
unsigned long efuse)
{
unsigned long calculated_efuse = AM62P5_SUPPORT_O_MPU_OPP;
switch (efuse) {
case AM62P5_EFUSE_U_MPU_OPP:
case AM62P5_EFUSE_S_MPU_OPP:
calculated_efuse |= AM62P5_SUPPORT_U_MPU_OPP;
fallthrough;
case AM62P5_EFUSE_O_MPU_OPP:
calculated_efuse |= AM62P5_SUPPORT_O_MPU_OPP;
}
return calculated_efuse;
}
static unsigned long am62a7_efuse_xlate(struct ti_cpufreq_data *opp_data,
unsigned long efuse)
{
unsigned long calculated_efuse = AM62A7_SUPPORT_N_MPU_OPP;
switch (efuse) {
case AM62A7_EFUSE_V_MPU_OPP:
case AM62A7_EFUSE_U_MPU_OPP:
case AM62A7_EFUSE_T_MPU_OPP:
case AM62A7_EFUSE_S_MPU_OPP:
calculated_efuse |= AM62A7_SUPPORT_V_MPU_OPP;
fallthrough;
case AM62A7_EFUSE_R_MPU_OPP:
case AM62A7_EFUSE_Q_MPU_OPP:
case AM62A7_EFUSE_P_MPU_OPP:
case AM62A7_EFUSE_O_MPU_OPP:
calculated_efuse |= AM62A7_SUPPORT_R_MPU_OPP;
fallthrough;
case AM62A7_EFUSE_N_MPU_OPP:
case AM62A7_EFUSE_M_MPU_OPP:
calculated_efuse |= AM62A7_SUPPORT_N_MPU_OPP;
}
return calculated_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 = 0 x07fc,
.efuse_mask = 0 x1fff,
.rev_offset = 0 x600,
.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 = 0 x0610,
.efuse_mask = 0 x3f,
.rev_offset = 0 x600,
.multi_regulator = false ,
};
static struct ti_cpufreq_soc_data dra7_soc_data = {
.efuse_xlate = dra7_efuse_xlate,
.efuse_offset = 0 x020c,
.efuse_mask = 0 xf80000,
.efuse_shift = 19 ,
.rev_offset = 0 x204,
.multi_regulator = true ,
};
/*
* OMAP35x TRM ( SPRUF98K ) :
* CONTROL_IDCODE ( 0 x4830 A204 ) describes Silicon revisions .
* Control OMAP Status Register 15 : 0 ( Address 0 x4800 244 C )
* to separate between omap3503 , omap3515 , omap3525 , omap3530
* and feature presence .
* There are encodings for versions limited to 400 / 266 MHz
* 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 0 x4830A20C [ ProdID . SKUID ] [ 0 : 3 ]
* 0 x0 for normal 600 / 430 MHz device .
* 0 x8 for 720 / 520 MHz 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 ,
.quirks = TI_QUIRK_SYSCON_MAY_BE_MISSING,
};
/*
* AM / DM37x TRM ( SPRUGN4M )
* CONTROL_IDCODE ( 0 x4830 A204 ) describes Silicon revisions .
* Control Device Status Register 15 : 0 ( Address 0 x4800 244 C )
* 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 1 G_VDD1
* are stored in the SYSCON register range .
* There is no 0 x4830A20C [ 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 ,
.quirks = TI_QUIRK_SYSCON_MAY_BE_MISSING,
};
/*
* 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 ,
.quirks = TI_QUIRK_SYSCON_MAY_BE_MISSING,
};
static const struct soc_device_attribute k3_cpufreq_soc[] = {
{ .family = "AM62X" , .revision = "SR1.0" },
{ .family = "AM62AX" , .revision = "SR1.0" },
{ .family = "AM62PX" , .revision = "SR1.0" },
{ .family = "AM62DX" , .revision = "SR1.0" },
{ /* sentinel */ }
};
static struct ti_cpufreq_soc_data am625_soc_data = {
.efuse_xlate = am625_efuse_xlate,
.efuse_offset = 0 x0018,
.efuse_mask = 0 x07c0,
.efuse_shift = 0 x6,
.multi_regulator = false ,
.quirks = TI_QUIRK_SYSCON_IS_SINGLE_REG,
};
static struct ti_cpufreq_soc_data am62a7_soc_data = {
.efuse_xlate = am62a7_efuse_xlate,
.efuse_offset = 0 x0,
.efuse_mask = 0 x07c0,
.efuse_shift = 0 x6,
.multi_regulator = false ,
};
static struct ti_cpufreq_soc_data am62p5_soc_data = {
.efuse_xlate = am62p5_efuse_xlate,
.efuse_offset = 0 x0,
.efuse_mask = 0 x07c0,
.efuse_shift = 0 x6,
.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 (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_IS_SINGLE_REG && ret == -EIO)
ret = regmap_read(opp_data->syscon, 0 x0, &efuse);
if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_MAY_BE_MISSING && 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;
if (soc_device_match(k3_cpufreq_soc)) {
/*
* Since the SR is 1 . 0 , hard code the revision_value as
* 0 x1 here . This way we avoid re using the same register
* that is giving us required information inside socinfo
* anyway .
*/
*revision_value = 0 x1;
goto done;
}
ret = regmap_read(opp_data->syscon, opp_data->soc_data->rev_offset,
&revision);
if (opp_data->soc_data->quirks & TI_QUIRK_SYSCON_MAY_BE_MISSING && 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);
done:
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[] __maybe_unused = {
{ .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 = &am62a7_soc_data, },
{ .compatible = "ti,am62d2" , .data = &am62a7_soc_data, },
{ .compatible = "ti,am62p5" , .data = &am62p5_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_probe(opp_data->cpu_dev, ret, "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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