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