summaryrefslogtreecommitdiffstats
path: root/drivers/thermal/intel_pch_thermal.c
blob: 50c7da79be830a43b342999ca80ef264431e0078 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
/* intel_pch_thermal.c - Intel PCH Thermal driver
 *
 * Copyright (c) 2015, Intel Corporation.
 *
 * Authors:
 *     Tushar Dave <tushar.n.dave@intel.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope 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/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/thermal.h>

/* Intel PCH thermal Device IDs */
#define PCH_THERMAL_DID_WPT	0x9CA4 /* Wildcat Point */

/* Wildcat Point-LP  PCH Thermal registers */
#define WPT_TEMP	0x0000	/* Temperature */
#define WPT_TSC	0x04	/* Thermal Sensor Control */
#define WPT_TSS	0x06	/* Thermal Sensor Status */
#define WPT_TSEL	0x08	/* Thermal Sensor Enable and Lock */
#define WPT_TSREL	0x0A	/* Thermal Sensor Report Enable and Lock */
#define WPT_TSMIC	0x0C	/* Thermal Sensor SMI Control */
#define WPT_CTT	0x0010	/* Catastrophic Trip Point */
#define WPT_TAHV	0x0014	/* Thermal Alert High Value */
#define WPT_TALV	0x0018	/* Thermal Alert Low Value */
#define WPT_TL		0x00000040	/* Throttle Value */
#define WPT_PHL	0x0060	/* PCH Hot Level */
#define WPT_PHLC	0x62	/* PHL Control */
#define WPT_TAS	0x80	/* Thermal Alert Status */
#define WPT_TSPIEN	0x82	/* PCI Interrupt Event Enables */
#define WPT_TSGPEN	0x84	/* General Purpose Event Enables */

/*  Wildcat Point-LP  PCH Thermal Register bit definitions */
#define WPT_TEMP_TSR	0x00ff	/* Temp TS Reading */
#define WPT_TSC_CPDE	0x01	/* Catastrophic Power-Down Enable */
#define WPT_TSS_TSDSS	0x10	/* Thermal Sensor Dynamic Shutdown Status */
#define WPT_TSS_GPES	0x08	/* GPE status */
#define WPT_TSEL_ETS	0x01    /* Enable TS */
#define WPT_TSEL_PLDB	0x80	/* TSEL Policy Lock-Down Bit */
#define WPT_TL_TOL	0x000001FF	/* T0 Level */
#define WPT_TL_T1L	0x1ff00000	/* T1 Level */
#define WPT_TL_TTEN	0x20000000	/* TT Enable */

static char driver_name[] = "Intel PCH thermal driver";

struct pch_thermal_device {
	void __iomem *hw_base;
	const struct pch_dev_ops *ops;
	struct pci_dev *pdev;
	struct thermal_zone_device *tzd;
	int crt_trip_id;
	unsigned long crt_temp;
	int hot_trip_id;
	unsigned long hot_temp;
};

static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips)
{
	u8 tsel;
	u16 trip_temp;

	*nr_trips = 0;

	/* Check if BIOS has already enabled thermal sensor */
	if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))
		goto read_trips;

	tsel = readb(ptd->hw_base + WPT_TSEL);
	/*
	 * When TSEL's Policy Lock-Down bit is 1, TSEL become RO.
	 * If so, thermal sensor cannot enable. Bail out.
	 */
	if (tsel & WPT_TSEL_PLDB) {
		dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
		return -ENODEV;
	}

	writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL);
	if (!(WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))) {
		dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n");
		return -ENODEV;
	}

read_trips:
	ptd->crt_trip_id = -1;
	trip_temp = readw(ptd->hw_base + WPT_CTT);
	trip_temp &= 0x1FF;
	if (trip_temp) {
		/* Resolution of 1/2 degree C and an offset of -50C */
		ptd->crt_temp = trip_temp * 1000 / 2 - 50000;
		ptd->crt_trip_id = 0;
		++(*nr_trips);
	}

	ptd->hot_trip_id = -1;
	trip_temp = readw(ptd->hw_base + WPT_PHL);
	trip_temp &= 0x1FF;
	if (trip_temp) {
		/* Resolution of 1/2 degree C and an offset of -50C */
		ptd->hot_temp = trip_temp * 1000 / 2 - 50000;
		ptd->hot_trip_id = *nr_trips;
		++(*nr_trips);
	}

	return 0;
}

static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int *temp)
{
	u8 wpt_temp;

	wpt_temp = WPT_TEMP_TSR & readl(ptd->hw_base + WPT_TEMP);

	/* Resolution of 1/2 degree C and an offset of -50C */
	*temp = (wpt_temp * 1000 / 2 - 50000);

	return 0;
}

struct pch_dev_ops {
	int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips);
	int (*get_temp)(struct pch_thermal_device *ptd, int *temp);
};


/* dev ops for Wildcat Point */
static struct pch_dev_ops pch_dev_ops_wpt = {
	.hw_init = pch_wpt_init,
	.get_temp = pch_wpt_get_temp,
};

static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp)
{
	struct pch_thermal_device *ptd = tzd->devdata;

	return	ptd->ops->get_temp(ptd, temp);
}

static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip,
			     enum thermal_trip_type *type)
{
	struct pch_thermal_device *ptd = tzd->devdata;

	if (ptd->crt_trip_id == trip)
		*type = THERMAL_TRIP_CRITICAL;
	else if (ptd->hot_trip_id == trip)
		*type = THERMAL_TRIP_HOT;
	else
		return -EINVAL;

	return 0;
}

static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp)
{
	struct pch_thermal_device *ptd = tzd->devdata;

	if (ptd->crt_trip_id == trip)
		*temp = ptd->crt_temp;
	else if (ptd->hot_trip_id == trip)
		*temp = ptd->hot_temp;
	else
		return -EINVAL;

	return 0;
}

static struct thermal_zone_device_ops tzd_ops = {
	.get_temp = pch_thermal_get_temp,
	.get_trip_type = pch_get_trip_type,
	.get_trip_temp = pch_get_trip_temp,
};


static int intel_pch_thermal_probe(struct pci_dev *pdev,
				   const struct pci_device_id *id)
{
	struct pch_thermal_device *ptd;
	int err;
	int nr_trips;
	char *dev_name;

	ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL);
	if (!ptd)
		return -ENOMEM;

	switch (pdev->device) {
	case PCH_THERMAL_DID_WPT:
		ptd->ops = &pch_dev_ops_wpt;
		dev_name = "pch_wildcat_point";
		break;
	default:
		dev_err(&pdev->dev, "unknown pch thermal device\n");
		return -ENODEV;
	}

	pci_set_drvdata(pdev, ptd);
	ptd->pdev = pdev;

	err = pci_enable_device(pdev);
	if (err) {
		dev_err(&pdev->dev, "failed to enable pci device\n");
		return err;
	}

	err = pci_request_regions(pdev, driver_name);
	if (err) {
		dev_err(&pdev->dev, "failed to request pci region\n");
		goto error_disable;
	}

	ptd->hw_base = pci_ioremap_bar(pdev, 0);
	if (!ptd->hw_base) {
		err = -ENOMEM;
		dev_err(&pdev->dev, "failed to map mem base\n");
		goto error_release;
	}

	err = ptd->ops->hw_init(ptd, &nr_trips);
	if (err)
		goto error_cleanup;

	ptd->tzd = thermal_zone_device_register(dev_name, nr_trips, 0, ptd,
						&tzd_ops, NULL, 0, 0);
	if (IS_ERR(ptd->tzd)) {
		dev_err(&pdev->dev, "Failed to register thermal zone %s\n",
			dev_name);
		err = PTR_ERR(ptd->tzd);
		goto error_cleanup;
	}

	return 0;

error_cleanup:
	iounmap(ptd->hw_base);
error_release:
	pci_release_regions(pdev);
error_disable:
	pci_disable_device(pdev);
	dev_err(&pdev->dev, "pci device failed to probe\n");
	return err;
}

static void intel_pch_thermal_remove(struct pci_dev *pdev)
{
	struct pch_thermal_device *ptd = pci_get_drvdata(pdev);

	thermal_zone_device_unregister(ptd->tzd);
	iounmap(ptd->hw_base);
	pci_set_drvdata(pdev, NULL);
	pci_release_region(pdev, 0);
	pci_disable_device(pdev);
}

static struct pci_device_id intel_pch_thermal_id[] = {
	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) },
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id);

static struct pci_driver intel_pch_thermal_driver = {
	.name		= "intel_pch_thermal",
	.id_table	= intel_pch_thermal_id,
	.probe		= intel_pch_thermal_probe,
	.remove		= intel_pch_thermal_remove,
};

module_pci_driver(intel_pch_thermal_driver);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel PCH Thermal driver");
OpenPOWER on IntegriCloud