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