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linux-next/drivers/thermal/armada_thermal.c
Miquel Raynal c5d7d57e68 thermal: armada: remove misleading comments 
On older versions of this thermal IP, TSEN referred as the internal
sensor in the thermal IP while EXT_TSEN referred as sensors outside of
this IP, ie in the CPUs most of the time. The bit names in the
specifications do not follow this rule anymore, so remove these comments
that are misleading.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Eduardo Valentin <edubezval@gmail.com>
2018-07-27 14:43:04 -07:00

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/*
* Marvell EBU Armada SoCs thermal sensor driver
*
* Copyright (C) 2013 Marvell
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/thermal.h>
#include <linux/iopoll.h>
/* Thermal Manager Control and Status Register */
#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
#define PMU_TM_DISABLE_OFFS 0
#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
#define PMU_TDC0_REF_CAL_CNT_OFFS 11
#define PMU_TDC0_REF_CAL_CNT_MASK (0x1ff << PMU_TDC0_REF_CAL_CNT_OFFS)
#define PMU_TDC0_OTF_CAL_MASK (0x1 << 30)
#define PMU_TDC0_START_CAL_MASK (0x1 << 25)
#define A375_UNIT_CONTROL_SHIFT 27
#define A375_UNIT_CONTROL_MASK 0x7
#define A375_READOUT_INVERT BIT(15)
#define A375_HW_RESETn BIT(8)
/* Legacy bindings */
#define LEGACY_CONTROL_MEM_LEN 0x4
/* Current bindings with the 2 control registers under the same memory area */
#define LEGACY_CONTROL1_OFFSET 0x0
#define CONTROL0_OFFSET 0x0
#define CONTROL1_OFFSET 0x4
/* Errata fields */
#define CONTROL0_TSEN_TC_TRIM_MASK 0x7
#define CONTROL0_TSEN_TC_TRIM_VAL 0x3
#define CONTROL0_TSEN_START BIT(0)
#define CONTROL0_TSEN_RESET BIT(1)
#define CONTROL0_TSEN_ENABLE BIT(2)
#define CONTROL1_EXT_TSEN_SW_RESET BIT(7)
#define CONTROL1_EXT_TSEN_HW_RESETn BIT(8)
#define STATUS_POLL_PERIOD_US 1000
#define STATUS_POLL_TIMEOUT_US 100000
struct armada_thermal_data;
/* Marvell EBU Thermal Sensor Dev Structure */
struct armada_thermal_priv {
void __iomem *status;
void __iomem *control0;
void __iomem *control1;
char zone_name[THERMAL_NAME_LENGTH];
struct armada_thermal_data *data;
};
struct armada_thermal_data {
/* Initialize the sensor */
void (*init_sensor)(struct platform_device *pdev,
struct armada_thermal_priv *);
/* Test for a valid sensor value (optional) */
bool (*is_valid)(struct armada_thermal_priv *);
/* Formula coeficients: temp = (b - m * reg) / div */
s64 coef_b;
s64 coef_m;
u32 coef_div;
bool inverted;
bool signed_sample;
/* Register shift and mask to access the sensor temperature */
unsigned int temp_shift;
unsigned int temp_mask;
u32 is_valid_bit;
bool needs_control0;
};
static void armadaxp_init_sensor(struct platform_device *pdev,
struct armada_thermal_priv *priv)
{
u32 reg;
reg = readl_relaxed(priv->control1);
reg |= PMU_TDC0_OTF_CAL_MASK;
/* Reference calibration value */
reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
/* Reset the sensor */
reg |= PMU_TDC0_SW_RST_MASK;
writel(reg, priv->control1);
/* Enable the sensor */
reg = readl_relaxed(priv->status);
reg &= ~PMU_TM_DISABLE_MASK;
writel(reg, priv->status);
}
static void armada370_init_sensor(struct platform_device *pdev,
struct armada_thermal_priv *priv)
{
u32 reg;
reg = readl_relaxed(priv->control1);
reg |= PMU_TDC0_OTF_CAL_MASK;
/* Reference calibration value */
reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
reg &= ~PMU_TDC0_START_CAL_MASK;
writel(reg, priv->control1);
msleep(10);
}
static void armada375_init_sensor(struct platform_device *pdev,
struct armada_thermal_priv *priv)
{
u32 reg;
reg = readl(priv->control1);
reg &= ~(A375_UNIT_CONTROL_MASK << A375_UNIT_CONTROL_SHIFT);
reg &= ~A375_READOUT_INVERT;
reg &= ~A375_HW_RESETn;
writel(reg, priv->control1);
msleep(20);
reg |= A375_HW_RESETn;
writel(reg, priv->control1);
msleep(50);
}
static void armada_wait_sensor_validity(struct armada_thermal_priv *priv)
{
u32 reg;
readl_relaxed_poll_timeout(priv->status, reg,
reg & priv->data->is_valid_bit,
STATUS_POLL_PERIOD_US,
STATUS_POLL_TIMEOUT_US);
}
static void armada380_init_sensor(struct platform_device *pdev,
struct armada_thermal_priv *priv)
{
u32 reg = readl_relaxed(priv->control1);
/* Disable the HW/SW reset */
reg |= CONTROL1_EXT_TSEN_HW_RESETn;
reg &= ~CONTROL1_EXT_TSEN_SW_RESET;
writel(reg, priv->control1);
/* Set Tsen Tc Trim to correct default value (errata #132698) */
if (priv->control0) {
reg = readl_relaxed(priv->control0);
reg &= ~CONTROL0_TSEN_TC_TRIM_MASK;
reg |= CONTROL0_TSEN_TC_TRIM_VAL;
writel(reg, priv->control0);
}
/* Wait the sensors to be valid or the core will warn the user */
armada_wait_sensor_validity(priv);
}
static void armada_ap806_init_sensor(struct platform_device *pdev,
struct armada_thermal_priv *priv)
{
u32 reg;
reg = readl_relaxed(priv->control0);
reg &= ~CONTROL0_TSEN_RESET;
reg |= CONTROL0_TSEN_START | CONTROL0_TSEN_ENABLE;
writel(reg, priv->control0);
/* Wait the sensors to be valid or the core will warn the user */
armada_wait_sensor_validity(priv);
}
static bool armada_is_valid(struct armada_thermal_priv *priv)
{
u32 reg = readl_relaxed(priv->status);
return reg & priv->data->is_valid_bit;
}
static int armada_get_temp(struct thermal_zone_device *thermal,
int *temp)
{
struct armada_thermal_priv *priv = thermal->devdata;
u32 reg, div;
s64 sample, b, m;
/* Valid check */
if (priv->data->is_valid && !priv->data->is_valid(priv)) {
dev_err(&thermal->device,
"Temperature sensor reading not valid\n");
return -EIO;
}
reg = readl_relaxed(priv->status);
reg = (reg >> priv->data->temp_shift) & priv->data->temp_mask;
if (priv->data->signed_sample)
/* The most significant bit is the sign bit */
sample = sign_extend32(reg, fls(priv->data->temp_mask) - 1);
else
sample = reg;
/* Get formula coeficients */
b = priv->data->coef_b;
m = priv->data->coef_m;
div = priv->data->coef_div;
if (priv->data->inverted)
*temp = div_s64((m * sample) - b, div);
else
*temp = div_s64(b - (m * sample), div);
return 0;
}
static struct thermal_zone_device_ops ops = {
.get_temp = armada_get_temp,
};
static const struct armada_thermal_data armadaxp_data = {
.init_sensor = armadaxp_init_sensor,
.temp_shift = 10,
.temp_mask = 0x1ff,
.coef_b = 3153000000ULL,
.coef_m = 10000000ULL,
.coef_div = 13825,
};
static const struct armada_thermal_data armada370_data = {
.is_valid = armada_is_valid,
.init_sensor = armada370_init_sensor,
.is_valid_bit = BIT(9),
.temp_shift = 10,
.temp_mask = 0x1ff,
.coef_b = 3153000000ULL,
.coef_m = 10000000ULL,
.coef_div = 13825,
};
static const struct armada_thermal_data armada375_data = {
.is_valid = armada_is_valid,
.init_sensor = armada375_init_sensor,
.is_valid_bit = BIT(10),
.temp_shift = 0,
.temp_mask = 0x1ff,
.coef_b = 3171900000ULL,
.coef_m = 10000000ULL,
.coef_div = 13616,
.needs_control0 = true,
};
static const struct armada_thermal_data armada380_data = {
.is_valid = armada_is_valid,
.init_sensor = armada380_init_sensor,
.is_valid_bit = BIT(10),
.temp_shift = 0,
.temp_mask = 0x3ff,
.coef_b = 1172499100ULL,
.coef_m = 2000096ULL,
.coef_div = 4201,
.inverted = true,
};
static const struct armada_thermal_data armada_ap806_data = {
.is_valid = armada_is_valid,
.init_sensor = armada_ap806_init_sensor,
.is_valid_bit = BIT(16),
.temp_shift = 0,
.temp_mask = 0x3ff,
.coef_b = -150000LL,
.coef_m = 423ULL,
.coef_div = 1,
.inverted = true,
.signed_sample = true,
.needs_control0 = true,
};
static const struct armada_thermal_data armada_cp110_data = {
.is_valid = armada_is_valid,
.init_sensor = armada380_init_sensor,
.is_valid_bit = BIT(10),
.temp_shift = 0,
.temp_mask = 0x3ff,
.coef_b = 1172499100ULL,
.coef_m = 2000096ULL,
.coef_div = 4201,
.inverted = true,
.needs_control0 = true,
};
static const struct of_device_id armada_thermal_id_table[] = {
{
.compatible = "marvell,armadaxp-thermal",
.data = &armadaxp_data,
},
{
.compatible = "marvell,armada370-thermal",
.data = &armada370_data,
},
{
.compatible = "marvell,armada375-thermal",
.data = &armada375_data,
},
{
.compatible = "marvell,armada380-thermal",
.data = &armada380_data,
},
{
.compatible = "marvell,armada-ap806-thermal",
.data = &armada_ap806_data,
},
{
.compatible = "marvell,armada-cp110-thermal",
.data = &armada_cp110_data,
},
{
/* sentinel */
},
};
MODULE_DEVICE_TABLE(of, armada_thermal_id_table);
static void armada_set_sane_name(struct platform_device *pdev,
struct armada_thermal_priv *priv)
{
const char *name = dev_name(&pdev->dev);
char *insane_char;
if (strlen(name) > THERMAL_NAME_LENGTH) {
/*
* When inside a system controller, the device name has the
* form: f06f8000.system-controller:ap-thermal so stripping
* after the ':' should give us a shorter but meaningful name.
*/
name = strrchr(name, ':');
if (!name)
name = "armada_thermal";
else
name++;
}
/* Save the name locally */
strncpy(priv->zone_name, name, THERMAL_NAME_LENGTH - 1);
priv->zone_name[THERMAL_NAME_LENGTH - 1] = '\0';
/* Then check there are no '-' or hwmon core will complain */
do {
insane_char = strpbrk(priv->zone_name, "-");
if (insane_char)
*insane_char = '_';
} while (insane_char);
}
static int armada_thermal_probe(struct platform_device *pdev)
{
void __iomem *control = NULL;
struct thermal_zone_device *thermal;
const struct of_device_id *match;
struct armada_thermal_priv *priv;
struct resource *res;
match = of_match_device(armada_thermal_id_table, &pdev->dev);
if (!match)
return -ENODEV;
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->status = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->status))
return PTR_ERR(priv->status);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
control = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(control))
return PTR_ERR(control);
priv->data = (struct armada_thermal_data *)match->data;
/* Ensure device name is correct for the thermal core */
armada_set_sane_name(pdev, priv);
/*
* Legacy DT bindings only described "control1" register (also referred
* as "control MSB" on old documentation). New bindings cover
* "control0/control LSB" and "control1/control MSB" registers within
* the same resource, which is then of size 8 instead of 4.
*/
if (resource_size(res) == LEGACY_CONTROL_MEM_LEN) {
/* ->control0 unavailable in this configuration */
if (priv->data->needs_control0) {
dev_err(&pdev->dev, "No access to control0 register\n");
return -EINVAL;
}
priv->control1 = control + LEGACY_CONTROL1_OFFSET;
} else {
priv->control0 = control + CONTROL0_OFFSET;
priv->control1 = control + CONTROL1_OFFSET;
}
priv->data->init_sensor(pdev, priv);
thermal = thermal_zone_device_register(priv->zone_name, 0, 0, priv,
&ops, NULL, 0, 0);
if (IS_ERR(thermal)) {
dev_err(&pdev->dev,
"Failed to register thermal zone device\n");
return PTR_ERR(thermal);
}
platform_set_drvdata(pdev, thermal);
return 0;
}
static int armada_thermal_exit(struct platform_device *pdev)
{
struct thermal_zone_device *armada_thermal =
platform_get_drvdata(pdev);
thermal_zone_device_unregister(armada_thermal);
return 0;
}
static struct platform_driver armada_thermal_driver = {
.probe = armada_thermal_probe,
.remove = armada_thermal_exit,
.driver = {
.name = "armada_thermal",
.of_match_table = armada_thermal_id_table,
},
};
module_platform_driver(armada_thermal_driver);
MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>");
MODULE_DESCRIPTION("Marvell EBU Armada SoCs thermal driver");
MODULE_LICENSE("GPL v2");
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