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d0a12625 TD |
1 | /* intel_pch_thermal.c - Intel PCH Thermal driver |
2 | * | |
3 | * Copyright (c) 2015, Intel Corporation. | |
4 | * | |
5 | * Authors: | |
6 | * Tushar Dave <tushar.n.dave@intel.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify it | |
9 | * under the terms and conditions of the GNU General Public License, | |
10 | * version 2, as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope it will be useful, but WITHOUT | |
13 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | * more details. | |
16 | * | |
17 | */ | |
18 | ||
19 | #include <linux/module.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/pci.h> | |
23 | #include <linux/thermal.h> | |
24 | ||
25 | /* Intel PCH thermal Device IDs */ | |
26 | #define PCH_THERMAL_DID_WPT 0x9CA4 /* Wildcat Point */ | |
27 | ||
28 | /* Wildcat Point-LP PCH Thermal registers */ | |
29 | #define WPT_TEMP 0x0000 /* Temperature */ | |
30 | #define WPT_TSC 0x04 /* Thermal Sensor Control */ | |
31 | #define WPT_TSS 0x06 /* Thermal Sensor Status */ | |
32 | #define WPT_TSEL 0x08 /* Thermal Sensor Enable and Lock */ | |
33 | #define WPT_TSREL 0x0A /* Thermal Sensor Report Enable and Lock */ | |
34 | #define WPT_TSMIC 0x0C /* Thermal Sensor SMI Control */ | |
35 | #define WPT_CTT 0x0010 /* Catastrophic Trip Point */ | |
36 | #define WPT_TAHV 0x0014 /* Thermal Alert High Value */ | |
37 | #define WPT_TALV 0x0018 /* Thermal Alert Low Value */ | |
38 | #define WPT_TL 0x00000040 /* Throttle Value */ | |
39 | #define WPT_PHL 0x0060 /* PCH Hot Level */ | |
40 | #define WPT_PHLC 0x62 /* PHL Control */ | |
41 | #define WPT_TAS 0x80 /* Thermal Alert Status */ | |
42 | #define WPT_TSPIEN 0x82 /* PCI Interrupt Event Enables */ | |
43 | #define WPT_TSGPEN 0x84 /* General Purpose Event Enables */ | |
44 | ||
45 | /* Wildcat Point-LP PCH Thermal Register bit definitions */ | |
46 | #define WPT_TEMP_TSR 0x00ff /* Temp TS Reading */ | |
47 | #define WPT_TSC_CPDE 0x01 /* Catastrophic Power-Down Enable */ | |
48 | #define WPT_TSS_TSDSS 0x10 /* Thermal Sensor Dynamic Shutdown Status */ | |
49 | #define WPT_TSS_GPES 0x08 /* GPE status */ | |
50 | #define WPT_TSEL_ETS 0x01 /* Enable TS */ | |
51 | #define WPT_TSEL_PLDB 0x80 /* TSEL Policy Lock-Down Bit */ | |
52 | #define WPT_TL_TOL 0x000001FF /* T0 Level */ | |
53 | #define WPT_TL_T1L 0x1ff00000 /* T1 Level */ | |
54 | #define WPT_TL_TTEN 0x20000000 /* TT Enable */ | |
55 | ||
56 | static char driver_name[] = "Intel PCH thermal driver"; | |
57 | ||
58 | struct pch_thermal_device { | |
59 | void __iomem *hw_base; | |
60 | const struct pch_dev_ops *ops; | |
61 | struct pci_dev *pdev; | |
62 | struct thermal_zone_device *tzd; | |
63 | int crt_trip_id; | |
64 | unsigned long crt_temp; | |
65 | int hot_trip_id; | |
66 | unsigned long hot_temp; | |
67 | }; | |
68 | ||
69 | static int pch_wpt_init(struct pch_thermal_device *ptd, int *nr_trips) | |
70 | { | |
71 | u8 tsel; | |
72 | u16 trip_temp; | |
73 | ||
74 | *nr_trips = 0; | |
75 | ||
76 | /* Check if BIOS has already enabled thermal sensor */ | |
77 | if (WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS)) | |
78 | goto read_trips; | |
79 | ||
80 | tsel = readb(ptd->hw_base + WPT_TSEL); | |
81 | /* | |
82 | * When TSEL's Policy Lock-Down bit is 1, TSEL become RO. | |
83 | * If so, thermal sensor cannot enable. Bail out. | |
84 | */ | |
85 | if (tsel & WPT_TSEL_PLDB) { | |
86 | dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n"); | |
87 | return -ENODEV; | |
88 | } | |
89 | ||
90 | writeb(tsel|WPT_TSEL_ETS, ptd->hw_base + WPT_TSEL); | |
91 | if (!(WPT_TSS_TSDSS & readb(ptd->hw_base + WPT_TSS))) { | |
92 | dev_err(&ptd->pdev->dev, "Sensor can't be enabled\n"); | |
93 | return -ENODEV; | |
94 | } | |
95 | ||
96 | read_trips: | |
97 | ptd->crt_trip_id = -1; | |
98 | trip_temp = readw(ptd->hw_base + WPT_CTT); | |
99 | trip_temp &= 0x1FF; | |
100 | if (trip_temp) { | |
101 | /* Resolution of 1/2 degree C and an offset of -50C */ | |
102 | ptd->crt_temp = trip_temp * 1000 / 2 - 50000; | |
103 | ptd->crt_trip_id = 0; | |
104 | ++(*nr_trips); | |
105 | } | |
106 | ||
107 | ptd->hot_trip_id = -1; | |
108 | trip_temp = readw(ptd->hw_base + WPT_PHL); | |
109 | trip_temp &= 0x1FF; | |
110 | if (trip_temp) { | |
111 | /* Resolution of 1/2 degree C and an offset of -50C */ | |
112 | ptd->hot_temp = trip_temp * 1000 / 2 - 50000; | |
113 | ptd->hot_trip_id = *nr_trips; | |
114 | ++(*nr_trips); | |
115 | } | |
116 | ||
117 | return 0; | |
118 | } | |
119 | ||
dfb22fc5 | 120 | static int pch_wpt_get_temp(struct pch_thermal_device *ptd, int *temp) |
d0a12625 TD |
121 | { |
122 | u8 wpt_temp; | |
123 | ||
124 | wpt_temp = WPT_TEMP_TSR & readl(ptd->hw_base + WPT_TEMP); | |
125 | ||
126 | /* Resolution of 1/2 degree C and an offset of -50C */ | |
127 | *temp = (wpt_temp * 1000 / 2 - 50000); | |
128 | ||
129 | return 0; | |
130 | } | |
131 | ||
132 | struct pch_dev_ops { | |
133 | int (*hw_init)(struct pch_thermal_device *ptd, int *nr_trips); | |
dfb22fc5 | 134 | int (*get_temp)(struct pch_thermal_device *ptd, int *temp); |
d0a12625 TD |
135 | }; |
136 | ||
137 | ||
138 | /* dev ops for Wildcat Point */ | |
139 | static struct pch_dev_ops pch_dev_ops_wpt = { | |
140 | .hw_init = pch_wpt_init, | |
141 | .get_temp = pch_wpt_get_temp, | |
142 | }; | |
143 | ||
dfb22fc5 | 144 | static int pch_thermal_get_temp(struct thermal_zone_device *tzd, int *temp) |
d0a12625 TD |
145 | { |
146 | struct pch_thermal_device *ptd = tzd->devdata; | |
147 | ||
148 | return ptd->ops->get_temp(ptd, temp); | |
149 | } | |
150 | ||
151 | static int pch_get_trip_type(struct thermal_zone_device *tzd, int trip, | |
152 | enum thermal_trip_type *type) | |
153 | { | |
154 | struct pch_thermal_device *ptd = tzd->devdata; | |
155 | ||
156 | if (ptd->crt_trip_id == trip) | |
157 | *type = THERMAL_TRIP_CRITICAL; | |
158 | else if (ptd->hot_trip_id == trip) | |
159 | *type = THERMAL_TRIP_HOT; | |
160 | else | |
161 | return -EINVAL; | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
dfb22fc5 | 166 | static int pch_get_trip_temp(struct thermal_zone_device *tzd, int trip, int *temp) |
d0a12625 TD |
167 | { |
168 | struct pch_thermal_device *ptd = tzd->devdata; | |
169 | ||
170 | if (ptd->crt_trip_id == trip) | |
171 | *temp = ptd->crt_temp; | |
172 | else if (ptd->hot_trip_id == trip) | |
173 | *temp = ptd->hot_temp; | |
174 | else | |
175 | return -EINVAL; | |
176 | ||
177 | return 0; | |
178 | } | |
179 | ||
180 | static struct thermal_zone_device_ops tzd_ops = { | |
181 | .get_temp = pch_thermal_get_temp, | |
182 | .get_trip_type = pch_get_trip_type, | |
183 | .get_trip_temp = pch_get_trip_temp, | |
184 | }; | |
185 | ||
186 | ||
187 | static int intel_pch_thermal_probe(struct pci_dev *pdev, | |
188 | const struct pci_device_id *id) | |
189 | { | |
190 | struct pch_thermal_device *ptd; | |
191 | int err; | |
192 | int nr_trips; | |
193 | char *dev_name; | |
194 | ||
195 | ptd = devm_kzalloc(&pdev->dev, sizeof(*ptd), GFP_KERNEL); | |
196 | if (!ptd) | |
197 | return -ENOMEM; | |
198 | ||
199 | switch (pdev->device) { | |
200 | case PCH_THERMAL_DID_WPT: | |
201 | ptd->ops = &pch_dev_ops_wpt; | |
202 | dev_name = "pch_wildcat_point"; | |
203 | break; | |
204 | default: | |
205 | dev_err(&pdev->dev, "unknown pch thermal device\n"); | |
206 | return -ENODEV; | |
207 | } | |
208 | ||
209 | pci_set_drvdata(pdev, ptd); | |
210 | ptd->pdev = pdev; | |
211 | ||
212 | err = pci_enable_device(pdev); | |
213 | if (err) { | |
214 | dev_err(&pdev->dev, "failed to enable pci device\n"); | |
215 | return err; | |
216 | } | |
217 | ||
218 | err = pci_request_regions(pdev, driver_name); | |
219 | if (err) { | |
220 | dev_err(&pdev->dev, "failed to request pci region\n"); | |
221 | goto error_disable; | |
222 | } | |
223 | ||
224 | ptd->hw_base = pci_ioremap_bar(pdev, 0); | |
225 | if (!ptd->hw_base) { | |
226 | err = -ENOMEM; | |
227 | dev_err(&pdev->dev, "failed to map mem base\n"); | |
228 | goto error_release; | |
229 | } | |
230 | ||
231 | err = ptd->ops->hw_init(ptd, &nr_trips); | |
232 | if (err) | |
233 | goto error_cleanup; | |
234 | ||
235 | ptd->tzd = thermal_zone_device_register(dev_name, nr_trips, 0, ptd, | |
236 | &tzd_ops, NULL, 0, 0); | |
237 | if (IS_ERR(ptd->tzd)) { | |
238 | dev_err(&pdev->dev, "Failed to register thermal zone %s\n", | |
239 | dev_name); | |
240 | err = PTR_ERR(ptd->tzd); | |
241 | goto error_cleanup; | |
242 | } | |
243 | ||
244 | return 0; | |
245 | ||
246 | error_cleanup: | |
247 | iounmap(ptd->hw_base); | |
248 | error_release: | |
249 | pci_release_regions(pdev); | |
250 | error_disable: | |
251 | pci_disable_device(pdev); | |
252 | dev_err(&pdev->dev, "pci device failed to probe\n"); | |
253 | return err; | |
254 | } | |
255 | ||
256 | static void intel_pch_thermal_remove(struct pci_dev *pdev) | |
257 | { | |
258 | struct pch_thermal_device *ptd = pci_get_drvdata(pdev); | |
259 | ||
260 | thermal_zone_device_unregister(ptd->tzd); | |
261 | iounmap(ptd->hw_base); | |
262 | pci_set_drvdata(pdev, NULL); | |
263 | pci_release_region(pdev, 0); | |
264 | pci_disable_device(pdev); | |
265 | } | |
266 | ||
267 | static struct pci_device_id intel_pch_thermal_id[] = { | |
268 | { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCH_THERMAL_DID_WPT) }, | |
269 | { 0, }, | |
270 | }; | |
271 | MODULE_DEVICE_TABLE(pci, intel_pch_thermal_id); | |
272 | ||
273 | static struct pci_driver intel_pch_thermal_driver = { | |
274 | .name = "intel_pch_thermal", | |
275 | .id_table = intel_pch_thermal_id, | |
276 | .probe = intel_pch_thermal_probe, | |
277 | .remove = intel_pch_thermal_remove, | |
278 | }; | |
279 | ||
280 | module_pci_driver(intel_pch_thermal_driver); | |
281 | ||
282 | MODULE_LICENSE("GPL v2"); | |
283 | MODULE_DESCRIPTION("Intel PCH Thermal driver"); |