1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22#include <linux/init.h>
23#include <linux/module.h>
24#include <linux/moduleparam.h>
25#include <linux/pnp.h>
26#include <linux/slab.h>
27#include <linux/interrupt.h>
28#include <linux/wait.h>
29#include <linux/acpi.h>
30#include <linux/freezer.h>
31#include <linux/of.h>
32#include <linux/of_device.h>
33#include <linux/kernel.h>
34#include "tpm.h"
35#include "tpm_tis_core.h"
36
37struct tpm_info {
38 struct resource res;
39
40
41
42
43 int irq;
44};
45
46struct tpm_tis_tcg_phy {
47 struct tpm_tis_data priv;
48 void __iomem *iobase;
49};
50
51static inline struct tpm_tis_tcg_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
52{
53 return container_of(data, struct tpm_tis_tcg_phy, priv);
54}
55
56static bool interrupts = true;
57module_param(interrupts, bool, 0444);
58MODULE_PARM_DESC(interrupts, "Enable interrupts");
59
60static bool itpm;
61module_param(itpm, bool, 0444);
62MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
63
64static bool force;
65#ifdef CONFIG_X86
66module_param(force, bool, 0444);
67MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
68#endif
69
70#if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
71static int has_hid(struct acpi_device *dev, const char *hid)
72{
73 struct acpi_hardware_id *id;
74
75 list_for_each_entry(id, &dev->pnp.ids, list)
76 if (!strcmp(hid, id->id))
77 return 1;
78
79 return 0;
80}
81
82static inline int is_itpm(struct acpi_device *dev)
83{
84 if (!dev)
85 return 0;
86 return has_hid(dev, "INTC0102");
87}
88#else
89static inline int is_itpm(struct acpi_device *dev)
90{
91 return 0;
92}
93#endif
94
95#if defined(CONFIG_ACPI)
96#define DEVICE_IS_TPM2 1
97
98static const struct acpi_device_id tpm_acpi_tbl[] = {
99 {"MSFT0101", DEVICE_IS_TPM2},
100 {},
101};
102MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);
103
104static int check_acpi_tpm2(struct device *dev)
105{
106 const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev);
107 struct acpi_table_tpm2 *tbl;
108 acpi_status st;
109
110 if (!aid || aid->driver_data != DEVICE_IS_TPM2)
111 return 0;
112
113
114
115
116 st =
117 acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
118 if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
119 dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
120 return -EINVAL;
121 }
122
123
124 if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
125 return -ENODEV;
126
127 return 0;
128}
129#else
130static int check_acpi_tpm2(struct device *dev)
131{
132 return 0;
133}
134#endif
135
136static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
137 u8 *result)
138{
139 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
140
141 while (len--)
142 *result++ = ioread8(phy->iobase + addr);
143
144 return 0;
145}
146
147static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
148 const u8 *value)
149{
150 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
151
152 while (len--)
153 iowrite8(*value++, phy->iobase + addr);
154
155 return 0;
156}
157
158static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
159{
160 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
161
162 *result = ioread16(phy->iobase + addr);
163
164 return 0;
165}
166
167static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result)
168{
169 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
170
171 *result = ioread32(phy->iobase + addr);
172
173 return 0;
174}
175
176static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
177{
178 struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
179
180 iowrite32(value, phy->iobase + addr);
181
182 return 0;
183}
184
185static const struct tpm_tis_phy_ops tpm_tcg = {
186 .read_bytes = tpm_tcg_read_bytes,
187 .write_bytes = tpm_tcg_write_bytes,
188 .read16 = tpm_tcg_read16,
189 .read32 = tpm_tcg_read32,
190 .write32 = tpm_tcg_write32,
191};
192
193static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info)
194{
195 struct tpm_tis_tcg_phy *phy;
196 int irq = -1;
197 int rc;
198
199 rc = check_acpi_tpm2(dev);
200 if (rc)
201 return rc;
202
203 phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL);
204 if (phy == NULL)
205 return -ENOMEM;
206
207 phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
208 if (IS_ERR(phy->iobase))
209 return PTR_ERR(phy->iobase);
210
211 if (interrupts)
212 irq = tpm_info->irq;
213
214 if (itpm || is_itpm(ACPI_COMPANION(dev)))
215 phy->priv.flags |= TPM_TIS_ITPM_WORKAROUND;
216
217 return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
218 ACPI_HANDLE(dev));
219}
220
221static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
222
223static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
224 const struct pnp_device_id *pnp_id)
225{
226 struct tpm_info tpm_info = {};
227 struct resource *res;
228
229 res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
230 if (!res)
231 return -ENODEV;
232 tpm_info.res = *res;
233
234 if (pnp_irq_valid(pnp_dev, 0))
235 tpm_info.irq = pnp_irq(pnp_dev, 0);
236 else
237 tpm_info.irq = -1;
238
239 return tpm_tis_init(&pnp_dev->dev, &tpm_info);
240}
241
242static struct pnp_device_id tpm_pnp_tbl[] = {
243 {"PNP0C31", 0},
244 {"ATM1200", 0},
245 {"IFX0102", 0},
246 {"BCM0101", 0},
247 {"BCM0102", 0},
248 {"NSC1200", 0},
249 {"ICO0102", 0},
250
251 {"", 0},
252 {"", 0}
253};
254MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
255
256static void tpm_tis_pnp_remove(struct pnp_dev *dev)
257{
258 struct tpm_chip *chip = pnp_get_drvdata(dev);
259
260 tpm_chip_unregister(chip);
261 tpm_tis_remove(chip);
262}
263
264static struct pnp_driver tis_pnp_driver = {
265 .name = "tpm_tis",
266 .id_table = tpm_pnp_tbl,
267 .probe = tpm_tis_pnp_init,
268 .remove = tpm_tis_pnp_remove,
269 .driver = {
270 .pm = &tpm_tis_pm,
271 },
272};
273
274#define TIS_HID_USR_IDX (ARRAY_SIZE(tpm_pnp_tbl) - 2)
275module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
276 sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
277MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
278
279static struct platform_device *force_pdev;
280
281static int tpm_tis_plat_probe(struct platform_device *pdev)
282{
283 struct tpm_info tpm_info = {};
284 struct resource *res;
285
286 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
287 if (res == NULL) {
288 dev_err(&pdev->dev, "no memory resource defined\n");
289 return -ENODEV;
290 }
291 tpm_info.res = *res;
292
293 tpm_info.irq = platform_get_irq(pdev, 0);
294 if (tpm_info.irq <= 0) {
295 if (pdev != force_pdev)
296 tpm_info.irq = -1;
297 else
298
299 tpm_info.irq = 0;
300 }
301
302 return tpm_tis_init(&pdev->dev, &tpm_info);
303}
304
305static int tpm_tis_plat_remove(struct platform_device *pdev)
306{
307 struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
308
309 tpm_chip_unregister(chip);
310 tpm_tis_remove(chip);
311
312 return 0;
313}
314
315#ifdef CONFIG_OF
316static const struct of_device_id tis_of_platform_match[] = {
317 {.compatible = "tcg,tpm-tis-mmio"},
318 {},
319};
320MODULE_DEVICE_TABLE(of, tis_of_platform_match);
321#endif
322
323static struct platform_driver tis_drv = {
324 .probe = tpm_tis_plat_probe,
325 .remove = tpm_tis_plat_remove,
326 .driver = {
327 .name = "tpm_tis",
328 .pm = &tpm_tis_pm,
329 .of_match_table = of_match_ptr(tis_of_platform_match),
330 .acpi_match_table = ACPI_PTR(tpm_acpi_tbl),
331 },
332};
333
334static int tpm_tis_force_device(void)
335{
336 struct platform_device *pdev;
337 static const struct resource x86_resources[] = {
338 {
339 .start = 0xFED40000,
340 .end = 0xFED40000 + TIS_MEM_LEN - 1,
341 .flags = IORESOURCE_MEM,
342 },
343 };
344
345 if (!force)
346 return 0;
347
348
349
350
351
352 pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
353 ARRAY_SIZE(x86_resources));
354 if (IS_ERR(pdev))
355 return PTR_ERR(pdev);
356 force_pdev = pdev;
357
358 return 0;
359}
360
361static int __init init_tis(void)
362{
363 int rc;
364
365 rc = tpm_tis_force_device();
366 if (rc)
367 goto err_force;
368
369 rc = platform_driver_register(&tis_drv);
370 if (rc)
371 goto err_platform;
372
373
374 if (IS_ENABLED(CONFIG_PNP)) {
375 rc = pnp_register_driver(&tis_pnp_driver);
376 if (rc)
377 goto err_pnp;
378 }
379
380 return 0;
381
382err_pnp:
383 platform_driver_unregister(&tis_drv);
384err_platform:
385 if (force_pdev)
386 platform_device_unregister(force_pdev);
387err_force:
388 return rc;
389}
390
391static void __exit cleanup_tis(void)
392{
393 pnp_unregister_driver(&tis_pnp_driver);
394 platform_driver_unregister(&tis_drv);
395
396 if (force_pdev)
397 platform_device_unregister(force_pdev);
398}
399
400module_init(init_tis);
401module_exit(cleanup_tis);
402MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
403MODULE_DESCRIPTION("TPM Driver");
404MODULE_VERSION("2.0");
405MODULE_LICENSE("GPL");
406
