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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 IBM Corporation | |
3 | * | |
4 | * Authors: | |
5 | * Leendert van Doorn <leendert@watson.ibm.com> | |
6 | * Dave Safford <safford@watson.ibm.com> | |
7 | * Reiner Sailer <sailer@watson.ibm.com> | |
8 | * Kylene Hall <kjhall@us.ibm.com> | |
9 | * | |
10 | * Maintained by: <tpmdd_devel@lists.sourceforge.net> | |
11 | * | |
12 | * Device driver for TCG/TCPA TPM (trusted platform module). | |
13 | * Specifications at www.trustedcomputinggroup.org | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License as | |
17 | * published by the Free Software Foundation, version 2 of the | |
18 | * License. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include "tpm.h" | |
23 | ||
24 | /* Atmel definitions */ | |
e1a23c66 KH |
25 | enum tpm_atmel_addr { |
26 | TPM_ATMEL_BASE_ADDR_LO = 0x08, | |
27 | TPM_ATMEL_BASE_ADDR_HI = 0x09 | |
3122a88a | 28 | }; |
1da177e4 LT |
29 | |
30 | /* write status bits */ | |
3122a88a KH |
31 | enum tpm_atmel_write_status { |
32 | ATML_STATUS_ABORT = 0x01, | |
33 | ATML_STATUS_LASTBYTE = 0x04 | |
34 | }; | |
1da177e4 | 35 | /* read status bits */ |
3122a88a KH |
36 | enum tpm_atmel_read_status { |
37 | ATML_STATUS_BUSY = 0x01, | |
38 | ATML_STATUS_DATA_AVAIL = 0x02, | |
39 | ATML_STATUS_REWRITE = 0x04, | |
40 | ATML_STATUS_READY = 0x08 | |
41 | }; | |
1da177e4 LT |
42 | |
43 | static int tpm_atml_recv(struct tpm_chip *chip, u8 * buf, size_t count) | |
44 | { | |
45 | u8 status, *hdr = buf; | |
46 | u32 size; | |
47 | int i; | |
48 | __be32 *native_size; | |
49 | ||
50 | /* start reading header */ | |
51 | if (count < 6) | |
52 | return -EIO; | |
53 | ||
54 | for (i = 0; i < 6; i++) { | |
55 | status = inb(chip->vendor->base + 1); | |
56 | if ((status & ATML_STATUS_DATA_AVAIL) == 0) { | |
57 | dev_err(&chip->pci_dev->dev, | |
58 | "error reading header\n"); | |
59 | return -EIO; | |
60 | } | |
61 | *buf++ = inb(chip->vendor->base); | |
62 | } | |
63 | ||
64 | /* size of the data received */ | |
65 | native_size = (__force __be32 *) (hdr + 2); | |
66 | size = be32_to_cpu(*native_size); | |
67 | ||
68 | if (count < size) { | |
69 | dev_err(&chip->pci_dev->dev, | |
70 | "Recv size(%d) less than available space\n", size); | |
71 | for (; i < size; i++) { /* clear the waiting data anyway */ | |
72 | status = inb(chip->vendor->base + 1); | |
73 | if ((status & ATML_STATUS_DATA_AVAIL) == 0) { | |
74 | dev_err(&chip->pci_dev->dev, | |
75 | "error reading data\n"); | |
76 | return -EIO; | |
77 | } | |
78 | } | |
79 | return -EIO; | |
80 | } | |
81 | ||
82 | /* read all the data available */ | |
83 | for (; i < size; i++) { | |
84 | status = inb(chip->vendor->base + 1); | |
85 | if ((status & ATML_STATUS_DATA_AVAIL) == 0) { | |
86 | dev_err(&chip->pci_dev->dev, | |
87 | "error reading data\n"); | |
88 | return -EIO; | |
89 | } | |
90 | *buf++ = inb(chip->vendor->base); | |
91 | } | |
92 | ||
93 | /* make sure data available is gone */ | |
94 | status = inb(chip->vendor->base + 1); | |
95 | if (status & ATML_STATUS_DATA_AVAIL) { | |
96 | dev_err(&chip->pci_dev->dev, "data available is stuck\n"); | |
97 | return -EIO; | |
98 | } | |
99 | ||
100 | return size; | |
101 | } | |
102 | ||
103 | static int tpm_atml_send(struct tpm_chip *chip, u8 * buf, size_t count) | |
104 | { | |
105 | int i; | |
106 | ||
107 | dev_dbg(&chip->pci_dev->dev, "tpm_atml_send: "); | |
108 | for (i = 0; i < count; i++) { | |
109 | dev_dbg(&chip->pci_dev->dev, "0x%x(%d) ", buf[i], buf[i]); | |
110 | outb(buf[i], chip->vendor->base); | |
111 | } | |
112 | ||
113 | return count; | |
114 | } | |
115 | ||
116 | static void tpm_atml_cancel(struct tpm_chip *chip) | |
117 | { | |
118 | outb(ATML_STATUS_ABORT, chip->vendor->base + 1); | |
119 | } | |
120 | ||
121 | static struct file_operations atmel_ops = { | |
122 | .owner = THIS_MODULE, | |
123 | .llseek = no_llseek, | |
124 | .open = tpm_open, | |
125 | .read = tpm_read, | |
126 | .write = tpm_write, | |
127 | .release = tpm_release, | |
128 | }; | |
129 | ||
6659ca2a KH |
130 | static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL); |
131 | static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL); | |
132 | static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL); | |
133 | static DEVICE_ATTR(cancel, S_IWUSR |S_IWGRP, NULL, tpm_store_cancel); | |
134 | ||
135 | static struct attribute* atmel_attrs[] = { | |
136 | &dev_attr_pubek.attr, | |
137 | &dev_attr_pcrs.attr, | |
138 | &dev_attr_caps.attr, | |
139 | &dev_attr_cancel.attr, | |
140 | 0, | |
141 | }; | |
142 | ||
143 | static struct attribute_group atmel_attr_grp = { .attrs = atmel_attrs }; | |
144 | ||
1da177e4 LT |
145 | static struct tpm_vendor_specific tpm_atmel = { |
146 | .recv = tpm_atml_recv, | |
147 | .send = tpm_atml_send, | |
148 | .cancel = tpm_atml_cancel, | |
149 | .req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL, | |
150 | .req_complete_val = ATML_STATUS_DATA_AVAIL, | |
d9e5b6bf | 151 | .req_canceled = ATML_STATUS_READY, |
6659ca2a | 152 | .attr_group = &atmel_attr_grp, |
1da177e4 LT |
153 | .miscdev = { .fops = &atmel_ops, }, |
154 | }; | |
155 | ||
156 | static int __devinit tpm_atml_init(struct pci_dev *pci_dev, | |
157 | const struct pci_device_id *pci_id) | |
158 | { | |
159 | u8 version[4]; | |
160 | int rc = 0; | |
e1a23c66 | 161 | int lo, hi; |
1da177e4 LT |
162 | |
163 | if (pci_enable_device(pci_dev)) | |
164 | return -EIO; | |
165 | ||
e1a23c66 KH |
166 | lo = tpm_read_index( TPM_ATMEL_BASE_ADDR_LO ); |
167 | hi = tpm_read_index( TPM_ATMEL_BASE_ADDR_HI ); | |
168 | ||
169 | tpm_atmel.base = (hi<<8)|lo; | |
170 | dev_dbg( &pci_dev->dev, "Operating with base: 0x%x\n", tpm_atmel.base); | |
1da177e4 LT |
171 | |
172 | /* verify that it is an Atmel part */ | |
173 | if (tpm_read_index(4) != 'A' || tpm_read_index(5) != 'T' | |
174 | || tpm_read_index(6) != 'M' || tpm_read_index(7) != 'L') { | |
175 | rc = -ENODEV; | |
176 | goto out_err; | |
177 | } | |
178 | ||
179 | /* query chip for its version number */ | |
180 | if ((version[0] = tpm_read_index(0x00)) != 0xFF) { | |
181 | version[1] = tpm_read_index(0x01); | |
182 | version[2] = tpm_read_index(0x02); | |
183 | version[3] = tpm_read_index(0x03); | |
184 | } else { | |
185 | dev_info(&pci_dev->dev, "version query failed\n"); | |
186 | rc = -ENODEV; | |
187 | goto out_err; | |
188 | } | |
189 | ||
190 | if ((rc = tpm_register_hardware(pci_dev, &tpm_atmel)) < 0) | |
191 | goto out_err; | |
192 | ||
193 | dev_info(&pci_dev->dev, | |
194 | "Atmel TPM version %d.%d.%d.%d\n", version[0], version[1], | |
195 | version[2], version[3]); | |
196 | ||
197 | return 0; | |
198 | out_err: | |
199 | pci_disable_device(pci_dev); | |
200 | return rc; | |
201 | } | |
202 | ||
203 | static struct pci_device_id tpm_pci_tbl[] __devinitdata = { | |
204 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)}, | |
205 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)}, | |
206 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)}, | |
207 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)}, | |
208 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)}, | |
209 | {PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_LPC)}, | |
a6df7da8 | 210 | {PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6LPC)}, |
1da177e4 LT |
211 | {0,} |
212 | }; | |
213 | ||
214 | MODULE_DEVICE_TABLE(pci, tpm_pci_tbl); | |
215 | ||
216 | static struct pci_driver atmel_pci_driver = { | |
217 | .name = "tpm_atmel", | |
218 | .id_table = tpm_pci_tbl, | |
219 | .probe = tpm_atml_init, | |
220 | .remove = __devexit_p(tpm_remove), | |
221 | .suspend = tpm_pm_suspend, | |
222 | .resume = tpm_pm_resume, | |
223 | }; | |
224 | ||
225 | static int __init init_atmel(void) | |
226 | { | |
227 | return pci_register_driver(&atmel_pci_driver); | |
228 | } | |
229 | ||
230 | static void __exit cleanup_atmel(void) | |
231 | { | |
232 | pci_unregister_driver(&atmel_pci_driver); | |
233 | } | |
234 | ||
235 | module_init(init_atmel); | |
236 | module_exit(cleanup_atmel); | |
237 | ||
238 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); | |
239 | MODULE_DESCRIPTION("TPM Driver"); | |
240 | MODULE_VERSION("2.0"); | |
241 | MODULE_LICENSE("GPL"); |