https://github.com/torvalds/linux
Tip revision: 0e698dfa282211e414076f9dc7e83c1c288314fd authored by Linus Torvalds on 03 May 2020, 21:56:04 UTC
Linux 5.7-rc4
Linux 5.7-rc4
Tip revision: 0e698df
qoriq_thermal.c
// SPDX-License-Identifier: GPL-2.0
//
// Copyright 2016 Freescale Semiconductor, Inc.
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/sizes.h>
#include <linux/thermal.h>
#include "thermal_core.h"
#include "thermal_hwmon.h"
#define SITES_MAX 16
#define TMR_DISABLE 0x0
#define TMR_ME 0x80000000
#define TMR_ALPF 0x0c000000
#define TMR_ALPF_V2 0x03000000
#define TMTMIR_DEFAULT 0x0000000f
#define TIER_DISABLE 0x0
#define TEUMR0_V2 0x51009c00
#define TMU_VER1 0x1
#define TMU_VER2 0x2
#define REGS_TMR 0x000 /* Mode Register */
#define TMR_DISABLE 0x0
#define TMR_ME 0x80000000
#define TMR_ALPF 0x0c000000
#define TMR_MSITE_ALL GENMASK(15, 0)
#define REGS_TMTMIR 0x008 /* Temperature measurement interval Register */
#define TMTMIR_DEFAULT 0x0000000f
#define REGS_V2_TMSR 0x008 /* monitor site register */
#define REGS_V2_TMTMIR 0x00c /* Temperature measurement interval Register */
#define REGS_TIER 0x020 /* Interrupt Enable Register */
#define TIER_DISABLE 0x0
#define REGS_TTCFGR 0x080 /* Temperature Configuration Register */
#define REGS_TSCFGR 0x084 /* Sensor Configuration Register */
#define REGS_TRITSR(n) (0x100 + 16 * (n)) /* Immediate Temperature
* Site Register
*/
#define TRITSR_V BIT(31)
#define REGS_TTRnCR(n) (0xf10 + 4 * (n)) /* Temperature Range n
* Control Register
*/
#define REGS_IPBRR(n) (0xbf8 + 4 * (n)) /* IP Block Revision
* Register n
*/
#define REGS_V2_TEUMR(n) (0xf00 + 4 * (n))
/*
* Thermal zone data
*/
struct qoriq_sensor {
int id;
};
struct qoriq_tmu_data {
int ver;
struct regmap *regmap;
struct clk *clk;
struct qoriq_sensor sensor[SITES_MAX];
};
static struct qoriq_tmu_data *qoriq_sensor_to_data(struct qoriq_sensor *s)
{
return container_of(s, struct qoriq_tmu_data, sensor[s->id]);
}
static int tmu_get_temp(void *p, int *temp)
{
struct qoriq_sensor *qsensor = p;
struct qoriq_tmu_data *qdata = qoriq_sensor_to_data(qsensor);
u32 val;
/*
* REGS_TRITSR(id) has the following layout:
*
* 31 ... 7 6 5 4 3 2 1 0
* V TEMP
*
* Where V bit signifies if the measurement is ready and is
* within sensor range. TEMP is an 8 bit value representing
* temperature in C.
*/
if (regmap_read_poll_timeout(qdata->regmap,
REGS_TRITSR(qsensor->id),
val,
val & TRITSR_V,
USEC_PER_MSEC,
10 * USEC_PER_MSEC))
return -ENODATA;
*temp = (val & 0xff) * 1000;
return 0;
}
static const struct thermal_zone_of_device_ops tmu_tz_ops = {
.get_temp = tmu_get_temp,
};
static int qoriq_tmu_register_tmu_zone(struct device *dev,
struct qoriq_tmu_data *qdata)
{
int id;
if (qdata->ver == TMU_VER1) {
regmap_write(qdata->regmap, REGS_TMR,
TMR_MSITE_ALL | TMR_ME | TMR_ALPF);
} else {
regmap_write(qdata->regmap, REGS_V2_TMSR, TMR_MSITE_ALL);
regmap_write(qdata->regmap, REGS_TMR, TMR_ME | TMR_ALPF_V2);
}
for (id = 0; id < SITES_MAX; id++) {
struct thermal_zone_device *tzd;
struct qoriq_sensor *sensor = &qdata->sensor[id];
int ret;
sensor->id = id;
tzd = devm_thermal_zone_of_sensor_register(dev, id,
sensor,
&tmu_tz_ops);
ret = PTR_ERR_OR_ZERO(tzd);
if (ret) {
if (ret == -ENODEV)
continue;
regmap_write(qdata->regmap, REGS_TMR, TMR_DISABLE);
return ret;
}
if (devm_thermal_add_hwmon_sysfs(tzd))
dev_warn(dev,
"Failed to add hwmon sysfs attributes\n");
}
return 0;
}
static int qoriq_tmu_calibration(struct device *dev,
struct qoriq_tmu_data *data)
{
int i, val, len;
u32 range[4];
const u32 *calibration;
struct device_node *np = dev->of_node;
len = of_property_count_u32_elems(np, "fsl,tmu-range");
if (len < 0 || len > 4) {
dev_err(dev, "invalid range data.\n");
return len;
}
val = of_property_read_u32_array(np, "fsl,tmu-range", range, len);
if (val != 0) {
dev_err(dev, "failed to read range data.\n");
return val;
}
/* Init temperature range registers */
for (i = 0; i < len; i++)
regmap_write(data->regmap, REGS_TTRnCR(i), range[i]);
calibration = of_get_property(np, "fsl,tmu-calibration", &len);
if (calibration == NULL || len % 8) {
dev_err(dev, "invalid calibration data.\n");
return -ENODEV;
}
for (i = 0; i < len; i += 8, calibration += 2) {
val = of_read_number(calibration, 1);
regmap_write(data->regmap, REGS_TTCFGR, val);
val = of_read_number(calibration + 1, 1);
regmap_write(data->regmap, REGS_TSCFGR, val);
}
return 0;
}
static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
{
/* Disable interrupt, using polling instead */
regmap_write(data->regmap, REGS_TIER, TIER_DISABLE);
/* Set update_interval */
if (data->ver == TMU_VER1) {
regmap_write(data->regmap, REGS_TMTMIR, TMTMIR_DEFAULT);
} else {
regmap_write(data->regmap, REGS_V2_TMTMIR, TMTMIR_DEFAULT);
regmap_write(data->regmap, REGS_V2_TEUMR(0), TEUMR0_V2);
}
/* Disable monitoring */
regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);
}
static const struct regmap_range qoriq_yes_ranges[] = {
regmap_reg_range(REGS_TMR, REGS_TSCFGR),
regmap_reg_range(REGS_TTRnCR(0), REGS_TTRnCR(3)),
regmap_reg_range(REGS_V2_TEUMR(0), REGS_V2_TEUMR(2)),
regmap_reg_range(REGS_IPBRR(0), REGS_IPBRR(1)),
/* Read only registers below */
regmap_reg_range(REGS_TRITSR(0), REGS_TRITSR(15)),
};
static const struct regmap_access_table qoriq_wr_table = {
.yes_ranges = qoriq_yes_ranges,
.n_yes_ranges = ARRAY_SIZE(qoriq_yes_ranges) - 1,
};
static const struct regmap_access_table qoriq_rd_table = {
.yes_ranges = qoriq_yes_ranges,
.n_yes_ranges = ARRAY_SIZE(qoriq_yes_ranges),
};
static void qoriq_tmu_action(void *p)
{
struct qoriq_tmu_data *data = p;
regmap_write(data->regmap, REGS_TMR, TMR_DISABLE);
clk_disable_unprepare(data->clk);
}
static int qoriq_tmu_probe(struct platform_device *pdev)
{
int ret;
u32 ver;
struct qoriq_tmu_data *data;
struct device_node *np = pdev->dev.of_node;
struct device *dev = &pdev->dev;
const bool little_endian = of_property_read_bool(np, "little-endian");
const enum regmap_endian format_endian =
little_endian ? REGMAP_ENDIAN_LITTLE : REGMAP_ENDIAN_BIG;
const struct regmap_config regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.rd_table = &qoriq_rd_table,
.wr_table = &qoriq_wr_table,
.val_format_endian = format_endian,
.max_register = SZ_4K,
};
void __iomem *base;
data = devm_kzalloc(dev, sizeof(struct qoriq_tmu_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
base = devm_platform_ioremap_resource(pdev, 0);
ret = PTR_ERR_OR_ZERO(base);
if (ret) {
dev_err(dev, "Failed to get memory region\n");
return ret;
}
data->regmap = devm_regmap_init_mmio(dev, base, ®map_config);
ret = PTR_ERR_OR_ZERO(data->regmap);
if (ret) {
dev_err(dev, "Failed to init regmap (%d)\n", ret);
return ret;
}
data->clk = devm_clk_get_optional(dev, NULL);
if (IS_ERR(data->clk))
return PTR_ERR(data->clk);
ret = clk_prepare_enable(data->clk);
if (ret) {
dev_err(dev, "Failed to enable clock\n");
return ret;
}
ret = devm_add_action_or_reset(dev, qoriq_tmu_action, data);
if (ret)
return ret;
/* version register offset at: 0xbf8 on both v1 and v2 */
ret = regmap_read(data->regmap, REGS_IPBRR(0), &ver);
if (ret) {
dev_err(&pdev->dev, "Failed to read IP block version\n");
return ret;
}
data->ver = (ver >> 8) & 0xff;
qoriq_tmu_init_device(data); /* TMU initialization */
ret = qoriq_tmu_calibration(dev, data); /* TMU calibration */
if (ret < 0)
return ret;
ret = qoriq_tmu_register_tmu_zone(dev, data);
if (ret < 0) {
dev_err(dev, "Failed to register sensors\n");
return ret;
}
platform_set_drvdata(pdev, data);
return 0;
}
static int __maybe_unused qoriq_tmu_suspend(struct device *dev)
{
struct qoriq_tmu_data *data = dev_get_drvdata(dev);
int ret;
ret = regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, 0);
if (ret)
return ret;
clk_disable_unprepare(data->clk);
return 0;
}
static int __maybe_unused qoriq_tmu_resume(struct device *dev)
{
int ret;
struct qoriq_tmu_data *data = dev_get_drvdata(dev);
ret = clk_prepare_enable(data->clk);
if (ret)
return ret;
/* Enable monitoring */
return regmap_update_bits(data->regmap, REGS_TMR, TMR_ME, TMR_ME);
}
static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops,
qoriq_tmu_suspend, qoriq_tmu_resume);
static const struct of_device_id qoriq_tmu_match[] = {
{ .compatible = "fsl,qoriq-tmu", },
{ .compatible = "fsl,imx8mq-tmu", },
{},
};
MODULE_DEVICE_TABLE(of, qoriq_tmu_match);
static struct platform_driver qoriq_tmu = {
.driver = {
.name = "qoriq_thermal",
.pm = &qoriq_tmu_pm_ops,
.of_match_table = qoriq_tmu_match,
},
.probe = qoriq_tmu_probe,
};
module_platform_driver(qoriq_tmu);
MODULE_AUTHOR("Jia Hongtao <hongtao.jia@nxp.com>");
MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver");
MODULE_LICENSE("GPL v2");