drivers/char/tpm/tpm_atmel.h

   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 static inline void atmel_put_base_addr(struct tpm_vendor_specific *vendor)
  31 {
  32         iounmap(vendor->iobase);
  33 }
  34
  35 static int atmel_get_base_addr(struct tpm_vendor_specific *vendor)
  36 {
  37         struct device_node *dn;
  38         unsigned long address, size;
  39         unsigned int *reg;
  40         int reglen;
  41         int naddrc;
  42         int nsizec;
  43
  44         dn = of_find_node_by_name(NULL, "tpm");
  45
  46         if (!dn)
  47                 return 1;
  48
  49         if (!device_is_compatible(dn, "AT97SC3201")) {
  50                 of_node_put(dn);
  51                 return 1;
  52         }
  53
  54         reg = (unsigned int *) get_property(dn, "reg", &reglen);
  55         naddrc = prom_n_addr_cells(dn);
  56         nsizec = prom_n_size_cells(dn);
  57
  58         of_node_put(dn);
  59
  60
  61         if (naddrc == 2)
  62                 address = ((unsigned long) reg[0] << 32) | reg[1];
  63         else
  64                 address = reg[0];
  65
  66         if (nsizec == 2)
  67                 size =
  68                     ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1];
  69         else
  70                 size = reg[naddrc];
  71
  72         vendor->base = address;
  73         vendor->region_size = size;
  74         vendor->iobase = ioremap(address, size);
  75         return 0;
  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 */
  83 enum 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 */
  89 static 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
 108 static inline void atmel_put_base_addr(struct tpm_vendor_specific *vendor)
 109 {
 110 }
 111
 112 /* Determine where to talk to device */
 113 static unsigned long atmel_get_base_addr(struct tpm_vendor_specific
 114                                          *vendor)
 115 {
 116         int lo, hi;
 117
 118         if (atmel_verify_tpm11() != 0)
 119                 return 1;
 120
 121         lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
 122         hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);
 123
 124         vendor->base = (hi << 8) | lo;
 125         vendor->region_size = 2;
 126
 127         return 0;
 128 }
 129 #endif