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22#include <linux/platform_device.h>
23#include <linux/slab.h>
24#include "tpm.h"
25
26
27enum tpm_nsc_addr{
28 TPM_NSC_IRQ = 0x07,
29 TPM_NSC_BASE0_HI = 0x60,
30 TPM_NSC_BASE0_LO = 0x61,
31 TPM_NSC_BASE1_HI = 0x62,
32 TPM_NSC_BASE1_LO = 0x63
33};
34
35enum tpm_nsc_index {
36 NSC_LDN_INDEX = 0x07,
37 NSC_SID_INDEX = 0x20,
38 NSC_LDC_INDEX = 0x30,
39 NSC_DIO_INDEX = 0x60,
40 NSC_CIO_INDEX = 0x62,
41 NSC_IRQ_INDEX = 0x70,
42 NSC_ITS_INDEX = 0x71
43};
44
45enum tpm_nsc_status_loc {
46 NSC_STATUS = 0x01,
47 NSC_COMMAND = 0x01,
48 NSC_DATA = 0x00
49};
50
51
52enum tpm_nsc_status {
53 NSC_STATUS_OBF = 0x01,
54 NSC_STATUS_IBF = 0x02,
55 NSC_STATUS_F0 = 0x04,
56 NSC_STATUS_A2 = 0x08,
57 NSC_STATUS_RDY = 0x10,
58 NSC_STATUS_IBR = 0x20
59};
60
61
62enum tpm_nsc_cmd_mode {
63 NSC_COMMAND_NORMAL = 0x01,
64 NSC_COMMAND_EOC = 0x03,
65 NSC_COMMAND_CANCEL = 0x22
66};
67
68struct tpm_nsc_priv {
69 unsigned long base;
70};
71
72
73
74
75static int wait_for_stat(struct tpm_chip *chip, u8 mask, u8 val, u8 * data)
76{
77 struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
78 unsigned long stop;
79
80
81 *data = inb(priv->base + NSC_STATUS);
82 if ((*data & mask) == val)
83 return 0;
84
85
86 stop = jiffies + 10 * HZ;
87 do {
88 msleep(TPM_TIMEOUT);
89 *data = inb(priv->base + 1);
90 if ((*data & mask) == val)
91 return 0;
92 }
93 while (time_before(jiffies, stop));
94
95 return -EBUSY;
96}
97
98static int nsc_wait_for_ready(struct tpm_chip *chip)
99{
100 struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
101 int status;
102 unsigned long stop;
103
104
105 status = inb(priv->base + NSC_STATUS);
106 if (status & NSC_STATUS_OBF)
107 status = inb(priv->base + NSC_DATA);
108 if (status & NSC_STATUS_RDY)
109 return 0;
110
111
112 stop = jiffies + 100;
113 do {
114 msleep(TPM_TIMEOUT);
115 status = inb(priv->base + NSC_STATUS);
116 if (status & NSC_STATUS_OBF)
117 status = inb(priv->base + NSC_DATA);
118 if (status & NSC_STATUS_RDY)
119 return 0;
120 }
121 while (time_before(jiffies, stop));
122
123 dev_info(&chip->dev, "wait for ready failed\n");
124 return -EBUSY;
125}
126
127
128static int tpm_nsc_recv(struct tpm_chip *chip, u8 * buf, size_t count)
129{
130 struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
131 u8 *buffer = buf;
132 u8 data, *p;
133 u32 size;
134 __be32 *native_size;
135
136 if (count < 6)
137 return -EIO;
138
139 if (wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0) {
140 dev_err(&chip->dev, "F0 timeout\n");
141 return -EIO;
142 }
143
144 data = inb(priv->base + NSC_DATA);
145 if (data != NSC_COMMAND_NORMAL) {
146 dev_err(&chip->dev, "not in normal mode (0x%x)\n",
147 data);
148 return -EIO;
149 }
150
151
152 for (p = buffer; p < &buffer[count]; p++) {
153 if (wait_for_stat
154 (chip, NSC_STATUS_OBF, NSC_STATUS_OBF, &data) < 0) {
155 dev_err(&chip->dev,
156 "OBF timeout (while reading data)\n");
157 return -EIO;
158 }
159 if (data & NSC_STATUS_F0)
160 break;
161 *p = inb(priv->base + NSC_DATA);
162 }
163
164 if ((data & NSC_STATUS_F0) == 0 &&
165 (wait_for_stat(chip, NSC_STATUS_F0, NSC_STATUS_F0, &data) < 0)) {
166 dev_err(&chip->dev, "F0 not set\n");
167 return -EIO;
168 }
169
170 data = inb(priv->base + NSC_DATA);
171 if (data != NSC_COMMAND_EOC) {
172 dev_err(&chip->dev,
173 "expected end of command(0x%x)\n", data);
174 return -EIO;
175 }
176
177 native_size = (__force __be32 *) (buf + 2);
178 size = be32_to_cpu(*native_size);
179
180 if (count < size)
181 return -EIO;
182
183 return size;
184}
185
186static int tpm_nsc_send(struct tpm_chip *chip, u8 * buf, size_t count)
187{
188 struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
189 u8 data;
190 int i;
191
192
193
194
195
196
197
198 outb(NSC_COMMAND_CANCEL, priv->base + NSC_COMMAND);
199
200 if (nsc_wait_for_ready(chip) != 0)
201 return -EIO;
202
203 if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
204 dev_err(&chip->dev, "IBF timeout\n");
205 return -EIO;
206 }
207
208 outb(NSC_COMMAND_NORMAL, priv->base + NSC_COMMAND);
209 if (wait_for_stat(chip, NSC_STATUS_IBR, NSC_STATUS_IBR, &data) < 0) {
210 dev_err(&chip->dev, "IBR timeout\n");
211 return -EIO;
212 }
213
214 for (i = 0; i < count; i++) {
215 if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
216 dev_err(&chip->dev,
217 "IBF timeout (while writing data)\n");
218 return -EIO;
219 }
220 outb(buf[i], priv->base + NSC_DATA);
221 }
222
223 if (wait_for_stat(chip, NSC_STATUS_IBF, 0, &data) < 0) {
224 dev_err(&chip->dev, "IBF timeout\n");
225 return -EIO;
226 }
227 outb(NSC_COMMAND_EOC, priv->base + NSC_COMMAND);
228
229 return count;
230}
231
232static void tpm_nsc_cancel(struct tpm_chip *chip)
233{
234 struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
235
236 outb(NSC_COMMAND_CANCEL, priv->base + NSC_COMMAND);
237}
238
239static u8 tpm_nsc_status(struct tpm_chip *chip)
240{
241 struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
242
243 return inb(priv->base + NSC_STATUS);
244}
245
246static bool tpm_nsc_req_canceled(struct tpm_chip *chip, u8 status)
247{
248 return (status == NSC_STATUS_RDY);
249}
250
251static const struct tpm_class_ops tpm_nsc = {
252 .recv = tpm_nsc_recv,
253 .send = tpm_nsc_send,
254 .cancel = tpm_nsc_cancel,
255 .status = tpm_nsc_status,
256 .req_complete_mask = NSC_STATUS_OBF,
257 .req_complete_val = NSC_STATUS_OBF,
258 .req_canceled = tpm_nsc_req_canceled,
259};
260
261static struct platform_device *pdev = NULL;
262
263static void tpm_nsc_remove(struct device *dev)
264{
265 struct tpm_chip *chip = dev_get_drvdata(dev);
266 struct tpm_nsc_priv *priv = dev_get_drvdata(&chip->dev);
267
268 tpm_chip_unregister(chip);
269 release_region(priv->base, 2);
270}
271
272static SIMPLE_DEV_PM_OPS(tpm_nsc_pm, tpm_pm_suspend, tpm_pm_resume);
273
274static struct platform_driver nsc_drv = {
275 .driver = {
276 .name = "tpm_nsc",
277 .pm = &tpm_nsc_pm,
278 },
279};
280
281static int __init init_nsc(void)
282{
283 int rc = 0;
284 int lo, hi, err;
285 int nscAddrBase = TPM_ADDR;
286 struct tpm_chip *chip;
287 unsigned long base;
288 struct tpm_nsc_priv *priv;
289
290
291 if (tpm_read_index(TPM_ADDR, NSC_SID_INDEX) != 0xEF) {
292 nscAddrBase = (tpm_read_index(TPM_SUPERIO_ADDR, 0x2C)<<8)|
293 (tpm_read_index(TPM_SUPERIO_ADDR, 0x2B)&0xFE);
294 if (tpm_read_index(nscAddrBase, NSC_SID_INDEX) != 0xF6)
295 return -ENODEV;
296 }
297
298 err = platform_driver_register(&nsc_drv);
299 if (err)
300 return err;
301
302 hi = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_HI);
303 lo = tpm_read_index(nscAddrBase, TPM_NSC_BASE0_LO);
304 base = (hi<<8) | lo;
305
306
307 tpm_write_index(nscAddrBase, NSC_LDC_INDEX, 0x01);
308
309 pdev = platform_device_alloc("tpm_nscl0", -1);
310 if (!pdev) {
311 rc = -ENOMEM;
312 goto err_unreg_drv;
313 }
314
315 pdev->num_resources = 0;
316 pdev->dev.driver = &nsc_drv.driver;
317 pdev->dev.release = tpm_nsc_remove;
318
319 if ((rc = platform_device_add(pdev)) < 0)
320 goto err_put_dev;
321
322 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
323 if (!priv) {
324 rc = -ENOMEM;
325 goto err_del_dev;
326 }
327
328 priv->base = base;
329
330 if (request_region(base, 2, "tpm_nsc0") == NULL ) {
331 rc = -EBUSY;
332 goto err_del_dev;
333 }
334
335 chip = tpmm_chip_alloc(&pdev->dev, &tpm_nsc);
336 if (IS_ERR(chip)) {
337 rc = -ENODEV;
338 goto err_rel_reg;
339 }
340
341 dev_set_drvdata(&chip->dev, priv);
342
343 rc = tpm_chip_register(chip);
344 if (rc)
345 goto err_rel_reg;
346
347 dev_dbg(&pdev->dev, "NSC TPM detected\n");
348 dev_dbg(&pdev->dev,
349 "NSC LDN 0x%x, SID 0x%x, SRID 0x%x\n",
350 tpm_read_index(nscAddrBase,0x07), tpm_read_index(nscAddrBase,0x20),
351 tpm_read_index(nscAddrBase,0x27));
352 dev_dbg(&pdev->dev,
353 "NSC SIOCF1 0x%x SIOCF5 0x%x SIOCF6 0x%x SIOCF8 0x%x\n",
354 tpm_read_index(nscAddrBase,0x21), tpm_read_index(nscAddrBase,0x25),
355 tpm_read_index(nscAddrBase,0x26), tpm_read_index(nscAddrBase,0x28));
356 dev_dbg(&pdev->dev, "NSC IO Base0 0x%x\n",
357 (tpm_read_index(nscAddrBase,0x60) << 8) | tpm_read_index(nscAddrBase,0x61));
358 dev_dbg(&pdev->dev, "NSC IO Base1 0x%x\n",
359 (tpm_read_index(nscAddrBase,0x62) << 8) | tpm_read_index(nscAddrBase,0x63));
360 dev_dbg(&pdev->dev, "NSC Interrupt number and wakeup 0x%x\n",
361 tpm_read_index(nscAddrBase,0x70));
362 dev_dbg(&pdev->dev, "NSC IRQ type select 0x%x\n",
363 tpm_read_index(nscAddrBase,0x71));
364 dev_dbg(&pdev->dev,
365 "NSC DMA channel select0 0x%x, select1 0x%x\n",
366 tpm_read_index(nscAddrBase,0x74), tpm_read_index(nscAddrBase,0x75));
367 dev_dbg(&pdev->dev,
368 "NSC Config "
369 "0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x 0x%x\n",
370 tpm_read_index(nscAddrBase,0xF0), tpm_read_index(nscAddrBase,0xF1),
371 tpm_read_index(nscAddrBase,0xF2), tpm_read_index(nscAddrBase,0xF3),
372 tpm_read_index(nscAddrBase,0xF4), tpm_read_index(nscAddrBase,0xF5),
373 tpm_read_index(nscAddrBase,0xF6), tpm_read_index(nscAddrBase,0xF7),
374 tpm_read_index(nscAddrBase,0xF8), tpm_read_index(nscAddrBase,0xF9));
375
376 dev_info(&pdev->dev,
377 "NSC TPM revision %d\n",
378 tpm_read_index(nscAddrBase, 0x27) & 0x1F);
379
380 return 0;
381
382err_rel_reg:
383 release_region(base, 2);
384err_del_dev:
385 platform_device_del(pdev);
386err_put_dev:
387 platform_device_put(pdev);
388err_unreg_drv:
389 platform_driver_unregister(&nsc_drv);
390 return rc;
391}
392
393static void __exit cleanup_nsc(void)
394{
395 if (pdev) {
396 tpm_nsc_remove(&pdev->dev);
397 platform_device_unregister(pdev);
398 }
399
400 platform_driver_unregister(&nsc_drv);
401}
402
403module_init(init_nsc);
404module_exit(cleanup_nsc);
405
406MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
407MODULE_DESCRIPTION("TPM Driver");
408MODULE_VERSION("2.0");
409MODULE_LICENSE("GPL");
410
