1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * Author: zhanghongchen <zhanghongchen@loongson.cn>
  4 *         Yinbo Zhu <zhuyinbo@loongson.cn>
  5 * Copyright (C) 2022-2023 Loongson Technology Corporation Limited
  6 */
  7
  8#include <linux/interrupt.h>
  9#include <linux/io.h>
 10#include <linux/minmax.h>
 11#include <linux/mod_devicetable.h>
 12#include <linux/module.h>
 13#include <linux/platform_device.h>
 14#include <linux/property.h>
 15#include <linux/thermal.h>
 16#include <linux/units.h>
 17
 18#include "thermal_hwmon.h"
 19
 20#define LOONGSON2_MAX_SENSOR_SEL_NUM	3
 21
 22#define LOONGSON2_THSENS_CTRL_HI_REG	0x0
 23#define LOONGSON2_THSENS_CTRL_LOW_REG	0x8
 24#define LOONGSON2_THSENS_STATUS_REG	0x10
 25#define LOONGSON2_THSENS_OUT_REG	0x14
 26
 27#define LOONGSON2_THSENS_INT_LO		BIT(0)
 28#define LOONGSON2_THSENS_INT_HIGH	BIT(1)
 29#define LOONGSON2_THSENS_INT_EN		(LOONGSON2_THSENS_INT_LO | \
 30					 LOONGSON2_THSENS_INT_HIGH)
 31#define LOONGSON2_THSENS_OUT_MASK	0xFF
 32
 33/*
 34 * This flag is used to indicate the temperature reading
 35 * method of the Loongson-2K2000
 36 */
 37#define LS2K2000_THSENS_OUT_FLAG	BIT(0)
 38
 39struct loongson2_thermal_chip_data {
 40	unsigned int thermal_sensor_sel;
 41	unsigned int flags;
 42};
 43
 44struct loongson2_thermal_data {
 45	void __iomem *ctrl_reg;
 46	void __iomem *temp_reg;
 47	const struct loongson2_thermal_chip_data *chip_data;
 48};
 49
 50static void loongson2_set_ctrl_regs(struct loongson2_thermal_data *data,
 51				    int ctrl_data, bool low, bool enable)
 52{
 53	int reg_ctrl = 0;
 54	int reg_off  = data->chip_data->thermal_sensor_sel * 2;
 55	int ctrl_reg = low ? LOONGSON2_THSENS_CTRL_LOW_REG : LOONGSON2_THSENS_CTRL_HI_REG;
 56
 57	reg_ctrl = ctrl_data + HECTO;
 58	reg_ctrl |= enable ? 0x100 : 0;
 59	writew(reg_ctrl, data->ctrl_reg + ctrl_reg + reg_off);
 60}
 61
 62static int loongson2_thermal_set(struct loongson2_thermal_data *data,
 63				 int low, int high, bool enable)
 64{
 65	/* Set low temperature threshold */
 66	loongson2_set_ctrl_regs(data, clamp(-40, low, high), true, enable);
 67
 68	/* Set high temperature threshold */
 69	loongson2_set_ctrl_regs(data, clamp(125, low, high), false, enable);
 70
 71	return 0;
 72}
 73
 74static int loongson2_2k1000_get_temp(struct thermal_zone_device *tz, int *temp)
 75{
 76	int val;
 77	struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
 78
 79	val = readl(data->ctrl_reg + LOONGSON2_THSENS_OUT_REG);
 80	*temp = ((val & LOONGSON2_THSENS_OUT_MASK) - HECTO) * KILO;
 81
 82	return 0;
 83}
 84
 85static int loongson2_2k2000_get_temp(struct thermal_zone_device *tz, int *temp)
 86{
 87	int val;
 88	struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
 89
 90	val = readl(data->temp_reg);
 91	*temp = ((val & 0xffff) * 820 / 0x4000 - 311) * KILO;
 92
 93	return 0;
 94}
 95
 96static irqreturn_t loongson2_thermal_irq_thread(int irq, void *dev)
 97{
 98	struct thermal_zone_device *tzd = dev;
 99	struct loongson2_thermal_data *data = thermal_zone_device_priv(tzd);
100
101	writeb(LOONGSON2_THSENS_INT_EN, data->ctrl_reg + LOONGSON2_THSENS_STATUS_REG);
102
103	thermal_zone_device_update(tzd, THERMAL_EVENT_UNSPECIFIED);
104
105	return IRQ_HANDLED;
106}
107
108static int loongson2_thermal_set_trips(struct thermal_zone_device *tz, int low, int high)
109{
110	struct loongson2_thermal_data *data = thermal_zone_device_priv(tz);
111
112	return loongson2_thermal_set(data, low/MILLI, high/MILLI, true);
113}
114
115static struct thermal_zone_device_ops loongson2_of_thermal_ops = {
116	.get_temp = loongson2_2k1000_get_temp,
117	.set_trips = loongson2_thermal_set_trips,
118};
119
120static int loongson2_thermal_probe(struct platform_device *pdev)
121{
122	struct device *dev = &pdev->dev;
123	struct loongson2_thermal_data *data;
124	struct thermal_zone_device *tzd;
125	int ret, irq, i;
126
127	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
128	if (!data)
129		return -ENOMEM;
130
131	data->chip_data = device_get_match_data(dev);
132
133	data->ctrl_reg = devm_platform_ioremap_resource(pdev, 0);
134	if (IS_ERR(data->ctrl_reg))
135		return PTR_ERR(data->ctrl_reg);
136
137	/* The temperature output register is separate for Loongson-2K2000 */
138	if (data->chip_data->flags & LS2K2000_THSENS_OUT_FLAG) {
139		data->temp_reg = devm_platform_ioremap_resource(pdev, 1);
140		if (IS_ERR(data->temp_reg))
141			return PTR_ERR(data->temp_reg);
142
143		loongson2_of_thermal_ops.get_temp = loongson2_2k2000_get_temp;
144	}
145
146	irq = platform_get_irq(pdev, 0);
147	if (irq < 0)
148		return irq;
149
150	writeb(LOONGSON2_THSENS_INT_EN, data->ctrl_reg + LOONGSON2_THSENS_STATUS_REG);
151
152	loongson2_thermal_set(data, 0, 0, false);
153
154	for (i = 0; i <= LOONGSON2_MAX_SENSOR_SEL_NUM; i++) {
155		tzd = devm_thermal_of_zone_register(dev, i, data,
156						    &loongson2_of_thermal_ops);
157
158		if (!IS_ERR(tzd))
159			break;
160
161		if (PTR_ERR(tzd) != -ENODEV)
162			continue;
163
164		return dev_err_probe(dev, PTR_ERR(tzd), "failed to register");
165	}
166
167	ret = devm_request_threaded_irq(dev, irq, NULL, loongson2_thermal_irq_thread,
168					IRQF_ONESHOT, "loongson2_thermal", tzd);
169	if (ret < 0)
170		return dev_err_probe(dev, ret, "failed to request alarm irq\n");
171
172	devm_thermal_add_hwmon_sysfs(dev, tzd);
173
174	return 0;
175}
176
177static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k1000_data = {
178	.thermal_sensor_sel = 0,
179	.flags = 0,
180};
181
182static const struct loongson2_thermal_chip_data loongson2_thermal_ls2k2000_data = {
183	.thermal_sensor_sel = 0,
184	.flags = LS2K2000_THSENS_OUT_FLAG,
185};
186
187static const struct of_device_id of_loongson2_thermal_match[] = {
188	{
189		.compatible = "loongson,ls2k1000-thermal",
190		.data = &loongson2_thermal_ls2k1000_data,
191	},
192	{
193		.compatible = "loongson,ls2k2000-thermal",
194		.data = &loongson2_thermal_ls2k2000_data,
195	},
196	{ /* end */ }
197};
198MODULE_DEVICE_TABLE(of, of_loongson2_thermal_match);
199
200static struct platform_driver loongson2_thermal_driver = {
201	.driver = {
202		.name		= "loongson2_thermal",
203		.of_match_table = of_loongson2_thermal_match,
204	},
205	.probe	= loongson2_thermal_probe,
206};
207module_platform_driver(loongson2_thermal_driver);
208
209MODULE_DESCRIPTION("Loongson2 thermal driver");
210MODULE_AUTHOR("Loongson Technology Corporation Limited");
211MODULE_LICENSE("GPL");