2 * Copyright 2016 Freescale Semiconductor, Inc.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 #include <linux/module.h>
16 #include <linux/platform_device.h>
17 #include <linux/err.h>
20 #include <linux/of_address.h>
21 #include <linux/thermal.h>
23 #include "thermal_core.h"
30 struct qoriq_tmu_site_regs {
31 u32 tritsr; /* Immediate Temperature Site Register */
32 u32 tratsr; /* Average Temperature Site Register */
36 struct qoriq_tmu_regs {
37 u32 tmr; /* Mode Register */
38 #define TMR_DISABLE 0x0
39 #define TMR_ME 0x80000000
40 #define TMR_ALPF 0x0c000000
41 u32 tsr; /* Status Register */
42 u32 tmtmir; /* Temperature measurement interval Register */
43 #define TMTMIR_DEFAULT 0x0000000f
45 u32 tier; /* Interrupt Enable Register */
46 #define TIER_DISABLE 0x0
47 u32 tidr; /* Interrupt Detect Register */
48 u32 tiscr; /* Interrupt Site Capture Register */
49 u32 ticscr; /* Interrupt Critical Site Capture Register */
51 u32 tmhtcrh; /* High Temperature Capture Register */
52 u32 tmhtcrl; /* Low Temperature Capture Register */
54 u32 tmhtitr; /* High Temperature Immediate Threshold */
55 u32 tmhtatr; /* High Temperature Average Threshold */
56 u32 tmhtactr; /* High Temperature Average Crit Threshold */
58 u32 ttcfgr; /* Temperature Configuration Register */
59 u32 tscfgr; /* Sensor Configuration Register */
61 struct qoriq_tmu_site_regs site[SITES_MAX];
63 u32 ipbrr0; /* IP Block Revision Register 0 */
64 u32 ipbrr1; /* IP Block Revision Register 1 */
66 u32 ttr0cr; /* Temperature Range 0 Control Register */
67 u32 ttr1cr; /* Temperature Range 1 Control Register */
68 u32 ttr2cr; /* Temperature Range 2 Control Register */
69 u32 ttr3cr; /* Temperature Range 3 Control Register */
75 struct qoriq_tmu_data {
76 struct thermal_zone_device *tz;
77 struct qoriq_tmu_regs __iomem *regs;
82 static void tmu_write(struct qoriq_tmu_data *p, u32 val, void __iomem *addr)
87 iowrite32be(val, addr);
90 static u32 tmu_read(struct qoriq_tmu_data *p, void __iomem *addr)
93 return ioread32(addr);
95 return ioread32be(addr);
98 static int tmu_get_temp(void *p, int *temp)
101 struct qoriq_tmu_data *data = p;
103 val = tmu_read(data, &data->regs->site[data->sensor_id].tritsr);
104 *temp = (val & 0xff) * 1000;
109 static int qoriq_tmu_get_sensor_id(void)
112 struct of_phandle_args sensor_specs;
113 struct device_node *np, *sensor_np;
115 np = of_find_node_by_name(NULL, "thermal-zones");
119 sensor_np = of_get_next_child(np, NULL);
120 ret = of_parse_phandle_with_args(sensor_np, "thermal-sensors",
121 "#thermal-sensor-cells",
125 of_node_put(sensor_np);
129 if (sensor_specs.args_count >= 1) {
130 id = sensor_specs.args[0];
131 WARN(sensor_specs.args_count > 1,
132 "%s: too many cells in sensor specifier %d\n",
133 sensor_specs.np->name, sensor_specs.args_count);
139 of_node_put(sensor_np);
144 static int qoriq_tmu_calibration(struct platform_device *pdev)
148 const u32 *calibration;
149 struct device_node *np = pdev->dev.of_node;
150 struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
152 if (of_property_read_u32_array(np, "fsl,tmu-range", range, 4)) {
153 dev_err(&pdev->dev, "missing calibration range.\n");
157 /* Init temperature range registers */
158 tmu_write(data, range[0], &data->regs->ttr0cr);
159 tmu_write(data, range[1], &data->regs->ttr1cr);
160 tmu_write(data, range[2], &data->regs->ttr2cr);
161 tmu_write(data, range[3], &data->regs->ttr3cr);
163 calibration = of_get_property(np, "fsl,tmu-calibration", &len);
164 if (calibration == NULL || len % 8) {
165 dev_err(&pdev->dev, "invalid calibration data.\n");
169 for (i = 0; i < len; i += 8, calibration += 2) {
170 val = of_read_number(calibration, 1);
171 tmu_write(data, val, &data->regs->ttcfgr);
172 val = of_read_number(calibration + 1, 1);
173 tmu_write(data, val, &data->regs->tscfgr);
179 static void qoriq_tmu_init_device(struct qoriq_tmu_data *data)
181 /* Disable interrupt, using polling instead */
182 tmu_write(data, TIER_DISABLE, &data->regs->tier);
184 /* Set update_interval */
185 tmu_write(data, TMTMIR_DEFAULT, &data->regs->tmtmir);
187 /* Disable monitoring */
188 tmu_write(data, TMR_DISABLE, &data->regs->tmr);
191 static struct thermal_zone_of_device_ops tmu_tz_ops = {
192 .get_temp = tmu_get_temp,
195 static int qoriq_tmu_probe(struct platform_device *pdev)
198 struct qoriq_tmu_data *data;
199 struct device_node *np = pdev->dev.of_node;
203 dev_err(&pdev->dev, "Device OF-Node is NULL");
207 data = devm_kzalloc(&pdev->dev, sizeof(struct qoriq_tmu_data),
212 platform_set_drvdata(pdev, data);
214 data->little_endian = of_property_read_bool(np, "little-endian");
216 data->sensor_id = qoriq_tmu_get_sensor_id();
217 if (data->sensor_id < 0) {
218 dev_err(&pdev->dev, "Failed to get sensor id\n");
223 data->regs = of_iomap(np, 0);
225 dev_err(&pdev->dev, "Failed to get memory region\n");
230 qoriq_tmu_init_device(data); /* TMU initialization */
232 ret = qoriq_tmu_calibration(pdev); /* TMU calibration */
236 data->tz = thermal_zone_of_sensor_register(&pdev->dev, data->sensor_id,
238 if (IS_ERR(data->tz)) {
239 ret = PTR_ERR(data->tz);
241 "Failed to register thermal zone device %d\n", ret);
245 /* Enable monitoring */
246 site |= 0x1 << (15 - data->sensor_id);
247 tmu_write(data, site | TMR_ME | TMR_ALPF, &data->regs->tmr);
255 platform_set_drvdata(pdev, NULL);
260 static int qoriq_tmu_remove(struct platform_device *pdev)
262 struct qoriq_tmu_data *data = platform_get_drvdata(pdev);
264 thermal_zone_of_sensor_unregister(&pdev->dev, data->tz);
266 /* Disable monitoring */
267 tmu_write(data, TMR_DISABLE, &data->regs->tmr);
270 platform_set_drvdata(pdev, NULL);
275 #ifdef CONFIG_PM_SLEEP
276 static int qoriq_tmu_suspend(struct device *dev)
279 struct qoriq_tmu_data *data = dev_get_drvdata(dev);
281 /* Disable monitoring */
282 tmr = tmu_read(data, &data->regs->tmr);
284 tmu_write(data, tmr, &data->regs->tmr);
289 static int qoriq_tmu_resume(struct device *dev)
292 struct qoriq_tmu_data *data = dev_get_drvdata(dev);
294 /* Enable monitoring */
295 tmr = tmu_read(data, &data->regs->tmr);
297 tmu_write(data, tmr, &data->regs->tmr);
303 static SIMPLE_DEV_PM_OPS(qoriq_tmu_pm_ops,
304 qoriq_tmu_suspend, qoriq_tmu_resume);
306 static const struct of_device_id qoriq_tmu_match[] = {
307 { .compatible = "fsl,qoriq-tmu", },
310 MODULE_DEVICE_TABLE(of, qoriq_tmu_match);
312 static struct platform_driver qoriq_tmu = {
314 .name = "qoriq_thermal",
315 .pm = &qoriq_tmu_pm_ops,
316 .of_match_table = qoriq_tmu_match,
318 .probe = qoriq_tmu_probe,
319 .remove = qoriq_tmu_remove,
321 module_platform_driver(qoriq_tmu);
323 MODULE_AUTHOR("Jia Hongtao <hongtao.jia@nxp.com>");
324 MODULE_DESCRIPTION("QorIQ Thermal Monitoring Unit driver");
325 MODULE_LICENSE("GPL v2");