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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 */ | |
3122a88a KH |
25 | enum tpm_atmel_addr{ |
26 | TPM_ATML_BASE = 0x400 | |
27 | }; | |
1da177e4 LT |
28 | |
29 | /* write status bits */ | |
3122a88a KH |
30 | enum tpm_atmel_write_status { |
31 | ATML_STATUS_ABORT = 0x01, | |
32 | ATML_STATUS_LASTBYTE = 0x04 | |
33 | }; | |
1da177e4 | 34 | /* read status bits */ |
3122a88a KH |
35 | enum tpm_atmel_read_status { |
36 | ATML_STATUS_BUSY = 0x01, | |
37 | ATML_STATUS_DATA_AVAIL = 0x02, | |
38 | ATML_STATUS_REWRITE = 0x04, | |
39 | ATML_STATUS_READY = 0x08 | |
40 | }; | |
1da177e4 LT |
41 | |
42 | static int tpm_atml_recv(struct tpm_chip *chip, u8 * buf, size_t count) | |
43 | { | |
44 | u8 status, *hdr = buf; | |
45 | u32 size; | |
46 | int i; | |
47 | __be32 *native_size; | |
48 | ||
49 | /* start reading header */ | |
50 | if (count < 6) | |
51 | return -EIO; | |
52 | ||
53 | for (i = 0; i < 6; i++) { | |
54 | status = inb(chip->vendor->base + 1); | |
55 | if ((status & ATML_STATUS_DATA_AVAIL) == 0) { | |
56 | dev_err(&chip->pci_dev->dev, | |
57 | "error reading header\n"); | |
58 | return -EIO; | |
59 | } | |
60 | *buf++ = inb(chip->vendor->base); | |
61 | } | |
62 | ||
63 | /* size of the data received */ | |
64 | native_size = (__force __be32 *) (hdr + 2); | |
65 | size = be32_to_cpu(*native_size); | |
66 | ||
67 | if (count < size) { | |
68 | dev_err(&chip->pci_dev->dev, | |
69 | "Recv size(%d) less than available space\n", size); | |
70 | for (; i < size; i++) { /* clear the waiting data anyway */ | |
71 | status = inb(chip->vendor->base + 1); | |
72 | if ((status & ATML_STATUS_DATA_AVAIL) == 0) { | |
73 | dev_err(&chip->pci_dev->dev, | |
74 | "error reading data\n"); | |
75 | return -EIO; | |
76 | } | |
77 | } | |
78 | return -EIO; | |
79 | } | |
80 | ||
81 | /* read all the data available */ | |
82 | for (; i < size; i++) { | |
83 | status = inb(chip->vendor->base + 1); | |
84 | if ((status & ATML_STATUS_DATA_AVAIL) == 0) { | |
85 | dev_err(&chip->pci_dev->dev, | |
86 | "error reading data\n"); | |
87 | return -EIO; | |
88 | } | |
89 | *buf++ = inb(chip->vendor->base); | |
90 | } | |
91 | ||
92 | /* make sure data available is gone */ | |
93 | status = inb(chip->vendor->base + 1); | |
94 | if (status & ATML_STATUS_DATA_AVAIL) { | |
95 | dev_err(&chip->pci_dev->dev, "data available is stuck\n"); | |
96 | return -EIO; | |
97 | } | |
98 | ||
99 | return size; | |
100 | } | |
101 | ||
102 | static int tpm_atml_send(struct tpm_chip *chip, u8 * buf, size_t count) | |
103 | { | |
104 | int i; | |
105 | ||
106 | dev_dbg(&chip->pci_dev->dev, "tpm_atml_send: "); | |
107 | for (i = 0; i < count; i++) { | |
108 | dev_dbg(&chip->pci_dev->dev, "0x%x(%d) ", buf[i], buf[i]); | |
109 | outb(buf[i], chip->vendor->base); | |
110 | } | |
111 | ||
112 | return count; | |
113 | } | |
114 | ||
115 | static void tpm_atml_cancel(struct tpm_chip *chip) | |
116 | { | |
117 | outb(ATML_STATUS_ABORT, chip->vendor->base + 1); | |
118 | } | |
119 | ||
120 | static struct file_operations atmel_ops = { | |
121 | .owner = THIS_MODULE, | |
122 | .llseek = no_llseek, | |
123 | .open = tpm_open, | |
124 | .read = tpm_read, | |
125 | .write = tpm_write, | |
126 | .release = tpm_release, | |
127 | }; | |
128 | ||
129 | static struct tpm_vendor_specific tpm_atmel = { | |
130 | .recv = tpm_atml_recv, | |
131 | .send = tpm_atml_send, | |
132 | .cancel = tpm_atml_cancel, | |
133 | .req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL, | |
134 | .req_complete_val = ATML_STATUS_DATA_AVAIL, | |
135 | .base = TPM_ATML_BASE, | |
136 | .miscdev = { .fops = &atmel_ops, }, | |
137 | }; | |
138 | ||
139 | static int __devinit tpm_atml_init(struct pci_dev *pci_dev, | |
140 | const struct pci_device_id *pci_id) | |
141 | { | |
142 | u8 version[4]; | |
143 | int rc = 0; | |
144 | ||
145 | if (pci_enable_device(pci_dev)) | |
146 | return -EIO; | |
147 | ||
148 | if (tpm_lpc_bus_init(pci_dev, TPM_ATML_BASE)) { | |
149 | rc = -ENODEV; | |
150 | goto out_err; | |
151 | } | |
152 | ||
153 | /* verify that it is an Atmel part */ | |
154 | if (tpm_read_index(4) != 'A' || tpm_read_index(5) != 'T' | |
155 | || tpm_read_index(6) != 'M' || tpm_read_index(7) != 'L') { | |
156 | rc = -ENODEV; | |
157 | goto out_err; | |
158 | } | |
159 | ||
160 | /* query chip for its version number */ | |
161 | if ((version[0] = tpm_read_index(0x00)) != 0xFF) { | |
162 | version[1] = tpm_read_index(0x01); | |
163 | version[2] = tpm_read_index(0x02); | |
164 | version[3] = tpm_read_index(0x03); | |
165 | } else { | |
166 | dev_info(&pci_dev->dev, "version query failed\n"); | |
167 | rc = -ENODEV; | |
168 | goto out_err; | |
169 | } | |
170 | ||
171 | if ((rc = tpm_register_hardware(pci_dev, &tpm_atmel)) < 0) | |
172 | goto out_err; | |
173 | ||
174 | dev_info(&pci_dev->dev, | |
175 | "Atmel TPM version %d.%d.%d.%d\n", version[0], version[1], | |
176 | version[2], version[3]); | |
177 | ||
178 | return 0; | |
179 | out_err: | |
180 | pci_disable_device(pci_dev); | |
181 | return rc; | |
182 | } | |
183 | ||
184 | static struct pci_device_id tpm_pci_tbl[] __devinitdata = { | |
185 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)}, | |
186 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)}, | |
187 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)}, | |
188 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)}, | |
189 | {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)}, | |
190 | {PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_8111_LPC)}, | |
191 | {0,} | |
192 | }; | |
193 | ||
194 | MODULE_DEVICE_TABLE(pci, tpm_pci_tbl); | |
195 | ||
196 | static struct pci_driver atmel_pci_driver = { | |
197 | .name = "tpm_atmel", | |
198 | .id_table = tpm_pci_tbl, | |
199 | .probe = tpm_atml_init, | |
200 | .remove = __devexit_p(tpm_remove), | |
201 | .suspend = tpm_pm_suspend, | |
202 | .resume = tpm_pm_resume, | |
203 | }; | |
204 | ||
205 | static int __init init_atmel(void) | |
206 | { | |
207 | return pci_register_driver(&atmel_pci_driver); | |
208 | } | |
209 | ||
210 | static void __exit cleanup_atmel(void) | |
211 | { | |
212 | pci_unregister_driver(&atmel_pci_driver); | |
213 | } | |
214 | ||
215 | module_init(init_atmel); | |
216 | module_exit(cleanup_atmel); | |
217 | ||
218 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); | |
219 | MODULE_DESCRIPTION("TPM Driver"); | |
220 | MODULE_VERSION("2.0"); | |
221 | MODULE_LICENSE("GPL"); |