2 * Copyright (C) 2005 IBM Corporation
5 * Kylene Hall <kjhall@us.ibm.com>
7 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
9 * Device driver for TCG/TCPA TPM (trusted platform module).
10 * Specifications at www.trustedcomputinggroup.org
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
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.
25 struct tpm_atmel_priv {
34 #define atmel_getb(chip, offset) readb(chip->vendor->iobase + offset);
35 #define atmel_putb(val, chip, offset) writeb(val, chip->vendor->iobase + offset)
36 #define atmel_request_region request_mem_region
37 #define atmel_release_region release_mem_region
39 static inline void atmel_put_base_addr(void __iomem *iobase)
44 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
46 struct device_node *dn;
47 unsigned long address, size;
48 const unsigned int *reg;
53 dn = of_find_node_by_name(NULL, "tpm");
58 if (!of_device_is_compatible(dn, "AT97SC3201")) {
63 reg = of_get_property(dn, "reg", ®len);
64 naddrc = of_n_addr_cells(dn);
65 nsizec = of_n_size_cells(dn);
71 address = ((unsigned long) reg[0] << 32) | reg[1];
77 ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1];
83 return ioremap(*base, *region_size);
86 #define atmel_getb(chip, offset) inb(chip->vendor->base + offset)
87 #define atmel_putb(val, chip, offset) outb(val, chip->vendor->base + offset)
88 #define atmel_request_region request_region
89 #define atmel_release_region release_region
90 /* Atmel definitions */
92 TPM_ATMEL_BASE_ADDR_LO = 0x08,
93 TPM_ATMEL_BASE_ADDR_HI = 0x09
96 /* Verify this is a 1.1 Atmel TPM */
97 static int atmel_verify_tpm11(void)
100 /* verify that it is an Atmel part */
101 if (tpm_read_index(TPM_ADDR, 4) != 'A' ||
102 tpm_read_index(TPM_ADDR, 5) != 'T' ||
103 tpm_read_index(TPM_ADDR, 6) != 'M' ||
104 tpm_read_index(TPM_ADDR, 7) != 'L')
107 /* query chip for its version number */
108 if (tpm_read_index(TPM_ADDR, 0x00) != 1 ||
109 tpm_read_index(TPM_ADDR, 0x01) != 1)
112 /* This is an atmel supported part */
116 static inline void atmel_put_base_addr(void __iomem *iobase)
120 /* Determine where to talk to device */
121 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
125 if (atmel_verify_tpm11() != 0)
128 lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
129 hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);
131 *base = (hi << 8) | lo;
134 return ioport_map(*base, *region_size);