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Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -08001/*
2 * Copyright (C) 2005 IBM Corporation
3 *
4 * Authors:
5 * Kylene Hall <kjhall@us.ibm.com>
6 *
Kent Yoder8e81cc12007-08-22 14:01:04 -07007 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -08008 *
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
Stephen Rothwellddf526e2007-05-12 10:36:56 -070026
27#include <asm/prom.h>
28
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080029#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
Kylene Jo Hall90612b32005-11-18 01:10:58 -080033
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -070034static inline void atmel_put_base_addr(void __iomem *iobase)
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080035{
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -070036 iounmap(iobase);
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080037}
38
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -070039static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080040{
41 struct device_node *dn;
42 unsigned long address, size;
Jeremy Kerr5c339e92006-07-12 15:41:30 +100043 const unsigned int *reg;
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080044 int reglen;
45 int naddrc;
46 int nsizec;
47
48 dn = of_find_node_by_name(NULL, "tpm");
49
50 if (!dn)
Kylene Jo Hall90612b32005-11-18 01:10:58 -080051 return NULL;
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080052
Stephen Rothwell55b61fe2007-05-03 17:26:52 +100053 if (!of_device_is_compatible(dn, "AT97SC3201")) {
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080054 of_node_put(dn);
Kylene Jo Hall90612b32005-11-18 01:10:58 -080055 return NULL;
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080056 }
57
Stephen Rothwell40cd3a42007-05-01 13:54:02 +100058 reg = of_get_property(dn, "reg", &reglen);
Stephen Rothwella8bda5d2007-04-03 10:56:50 +100059 naddrc = of_n_addr_cells(dn);
Stephen Rothwell9213fee2007-04-03 10:57:48 +100060 nsizec = of_n_size_cells(dn);
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080061
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
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -070076 *base = address;
77 *region_size = size;
78 return ioremap(*base, *region_size);
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -080079}
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 */
86enum 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 */
92static 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
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -0700111static inline void atmel_put_base_addr(void __iomem *iobase)
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -0800112{
113}
114
115/* Determine where to talk to device */
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -0700116static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -0800117{
118 int lo, hi;
119
120 if (atmel_verify_tpm11() != 0)
Kylene Jo Hall90612b32005-11-18 01:10:58 -0800121 return NULL;
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -0800122
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
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -0700126 *base = (hi << 8) | lo;
127 *region_size = 2;
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -0800128
Kylene Jo Halle0dd03c2006-04-22 02:37:26 -0700129 return ioport_map(*base, *region_size);
Kylene Jo Hallad5ea3c2005-11-13 16:07:41 -0800130}
131#endif