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
27 #include <asm/prom.h>
28
29 #define atmel_getb(chip, offset) readb(chip->vendor->iobase + offset);
30 #define atmel_putb(val, chip, offset) writeb(val, chip->vendor->iobase + offset)
31 #define atmel_request_region request_mem_region
32 #define atmel_release_region release_mem_region
33
34 static inline void atmel_put_base_addr(void __iomem *iobase)
35 {
36 iounmap(iobase);
37 }
38
39 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
40 {
41 struct device_node *dn;
42 unsigned long address, size;
43 const unsigned int *reg;
44 int reglen;
45 int naddrc;
46 int nsizec;
47
48 dn = of_find_node_by_name(NULL, "tpm");
49
50 if (!dn)
51 return NULL;
52
53 if (!of_device_is_compatible(dn, "AT97SC3201")) {
54 of_node_put(dn);
55 return NULL;
56 }
57
58 reg = of_get_property(dn, "reg", ®len);
59 naddrc = of_n_addr_cells(dn);
60 nsizec = of_n_size_cells(dn);
61
62 of_node_put(dn);
63
64
65 if (naddrc == 2)
66 address = ((unsigned long) reg[0] << 32) | reg[1];
67 else
68 address = reg[0];
69
70 if (nsizec == 2)
71 size =
72 ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1];
73 else
74 size = reg[naddrc];
75
76 *base = address;
77 *region_size = size;
78 return ioremap(*base, *region_size);
79 }
80 #else
81 #define atmel_getb(chip, offset) inb(chip->vendor->base + offset)
82 #define atmel_putb(val, chip, offset) outb(val, chip->vendor->base + offset)
83 #define atmel_request_region request_region
84 #define atmel_release_region release_region
85 /* Atmel definitions */
86 enum tpm_atmel_addr {
87 TPM_ATMEL_BASE_ADDR_LO = 0x08,
88 TPM_ATMEL_BASE_ADDR_HI = 0x09
89 };
90
91 /* Verify this is a 1.1 Atmel TPM */
92 static int atmel_verify_tpm11(void)
93 {
94
95 /* verify that it is an Atmel part */
96 if (tpm_read_index(TPM_ADDR, 4) != 'A' ||
97 tpm_read_index(TPM_ADDR, 5) != 'T' ||
98 tpm_read_index(TPM_ADDR, 6) != 'M' ||
99 tpm_read_index(TPM_ADDR, 7) != 'L')
100 return 1;
101
102 /* query chip for its version number */
103 if (tpm_read_index(TPM_ADDR, 0x00) != 1 ||
104 tpm_read_index(TPM_ADDR, 0x01) != 1)
105 return 1;
106
107 /* This is an atmel supported part */
108 return 0;
109 }
110
111 static inline void atmel_put_base_addr(void __iomem *iobase)
112 {
113 }
114
115 /* Determine where to talk to device */
116 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
117 {
118 int lo, hi;
119
120 if (atmel_verify_tpm11() != 0)
121 return NULL;
122
123 lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
124 hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);
125
126 *base = (hi << 8) | lo;
127 *region_size = 2;
128
129 return ioport_map(*base, *region_size);
130 }
131 #endif
132
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