tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2005 IBM Corporation
3 *
4 * Authors:
5 * Kylene Hall <kjhall@us.ibm.com>
6 *
7 * Maintained by: <tpmdd_devel@lists.sourceforge.net>
8 *
9 * Device driver for TCG/TCPA TPM (trusted platform module).
10 * Specifications at www.trustedcomputinggroup.org
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation, version 2 of the
15 * License.
16 *
17 * These difference are required on power because the device must be
18 * discovered through the device tree and iomap must be used to get
19 * around the need for holes in the io_page_mask. This does not happen
20 * automatically because the tpm is not a normal pci device and lives
21 * under the root node.
22 *
23 */
24
25#ifdef CONFIG_PPC64
26#define atmel_getb(chip, offset) readb(chip->vendor->iobase + offset);
27#define atmel_putb(val, chip, offset) writeb(val, chip->vendor->iobase + offset)
28#define atmel_request_region request_mem_region
29#define atmel_release_region release_mem_region
30
31static inline void atmel_put_base_addr(void __iomem *iobase)
32{
33 iounmap(iobase);
34}
35
36static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
37{
38 struct device_node *dn;
39 unsigned long address, size;
40 const unsigned int *reg;
41 int reglen;
42 int naddrc;
43 int nsizec;
44
45 dn = of_find_node_by_name(NULL, "tpm");
46
47 if (!dn)
48 return NULL;
49
50 if (!device_is_compatible(dn, "AT97SC3201")) {
51 of_node_put(dn);
52 return NULL;
53 }
54
55 reg = get_property(dn, "reg", ®len);
56 naddrc = prom_n_addr_cells(dn);
57 nsizec = prom_n_size_cells(dn);
58
59 of_node_put(dn);
60
61
62 if (naddrc == 2)
63 address = ((unsigned long) reg[0] << 32) | reg[1];
64 else
65 address = reg[0];
66
67 if (nsizec == 2)
68 size =
69 ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1];
70 else
71 size = reg[naddrc];
72
73 *base = address;
74 *region_size = size;
75 return ioremap(*base, *region_size);
76}
77#else
78#define atmel_getb(chip, offset) inb(chip->vendor->base + offset)
79#define atmel_putb(val, chip, offset) outb(val, chip->vendor->base + offset)
80#define atmel_request_region request_region
81#define atmel_release_region release_region
82/* Atmel definitions */
83enum tpm_atmel_addr {
84 TPM_ATMEL_BASE_ADDR_LO = 0x08,
85 TPM_ATMEL_BASE_ADDR_HI = 0x09
86};
87
88/* Verify this is a 1.1 Atmel TPM */
89static int atmel_verify_tpm11(void)
90{
91
92 /* verify that it is an Atmel part */
93 if (tpm_read_index(TPM_ADDR, 4) != 'A' ||
94 tpm_read_index(TPM_ADDR, 5) != 'T' ||
95 tpm_read_index(TPM_ADDR, 6) != 'M' ||
96 tpm_read_index(TPM_ADDR, 7) != 'L')
97 return 1;
98
99 /* query chip for its version number */
100 if (tpm_read_index(TPM_ADDR, 0x00) != 1 ||
101 tpm_read_index(TPM_ADDR, 0x01) != 1)
102 return 1;
103
104 /* This is an atmel supported part */
105 return 0;
106}
107
108static inline void atmel_put_base_addr(void __iomem *iobase)
109{
110}
111
112/* Determine where to talk to device */
113static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
114{
115 int lo, hi;
116
117 if (atmel_verify_tpm11() != 0)
118 return NULL;
119
120 lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
121 hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);
122
123 *base = (hi << 8) | lo;
124 *region_size = 2;
125
126 return ioport_map(*base, *region_size);
127}
128#endif