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 {
31 static inline struct tpm_atmel_priv *atmel_get_priv(struct tpm_chip *chip)
33 return chip->vendor.priv;
40 #define atmel_getb(chip, offset) readb(chip->vendor->iobase + offset);
41 #define atmel_putb(val, chip, offset) writeb(val, chip->vendor->iobase + offset)
42 #define atmel_request_region request_mem_region
43 #define atmel_release_region release_mem_region
45 static inline void atmel_put_base_addr(void __iomem *iobase)
50 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
52 struct device_node *dn;
53 unsigned long address, size;
54 const unsigned int *reg;
59 dn = of_find_node_by_name(NULL, "tpm");
64 if (!of_device_is_compatible(dn, "AT97SC3201")) {
69 reg = of_get_property(dn, "reg", ®len);
70 naddrc = of_n_addr_cells(dn);
71 nsizec = of_n_size_cells(dn);
77 address = ((unsigned long) reg[0] << 32) | reg[1];
83 ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1];
89 return ioremap(*base, *region_size);
92 #define atmel_getb(chip, offset) inb(atmel_get_priv(chip)->base + offset)
93 #define atmel_putb(val, chip, offset) \
94 outb(val, atmel_get_priv(chip)->base + offset)
95 #define atmel_request_region request_region
96 #define atmel_release_region release_region
97 /* Atmel definitions */
99 TPM_ATMEL_BASE_ADDR_LO = 0x08,
100 TPM_ATMEL_BASE_ADDR_HI = 0x09
103 /* Verify this is a 1.1 Atmel TPM */
104 static int atmel_verify_tpm11(void)
107 /* verify that it is an Atmel part */
108 if (tpm_read_index(TPM_ADDR, 4) != 'A' ||
109 tpm_read_index(TPM_ADDR, 5) != 'T' ||
110 tpm_read_index(TPM_ADDR, 6) != 'M' ||
111 tpm_read_index(TPM_ADDR, 7) != 'L')
114 /* query chip for its version number */
115 if (tpm_read_index(TPM_ADDR, 0x00) != 1 ||
116 tpm_read_index(TPM_ADDR, 0x01) != 1)
119 /* This is an atmel supported part */
123 static inline void atmel_put_base_addr(void __iomem *iobase)
127 /* Determine where to talk to device */
128 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
132 if (atmel_verify_tpm11() != 0)
135 lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
136 hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);
138 *base = (hi << 8) | lo;
141 return ioport_map(*base, *region_size);