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 31 static inline void atmel_put_base_addr(struct tpm_vendor_specific 32 *vendor) 33 { 34 iounmap(vendor->iobase); 35 } 36 37 static void __iomem * atmel_get_base_addr(struct tpm_vendor_specific *vendor) 38 { 39 struct device_node *dn; 40 unsigned long address, size; 41 unsigned int *reg; 42 int reglen; 43 int naddrc; 44 int nsizec; 45 46 dn = of_find_node_by_name(NULL, "tpm"); 47 48 if (!dn) 49 return NULL; 50 51 if (!device_is_compatible(dn, "AT97SC3201")) { 52 of_node_put(dn); 53 return NULL; 54 } 55 56 reg = (unsigned int *) get_property(dn, "reg", ®len); 57 naddrc = prom_n_addr_cells(dn); 58 nsizec = prom_n_size_cells(dn); 59 60 of_node_put(dn); 61 62 63 if (naddrc == 2) 64 address = ((unsigned long) reg[0] << 32) | reg[1]; 65 else 66 address = reg[0]; 67 68 if (nsizec == 2) 69 size = 70 ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1]; 71 else 72 size = reg[naddrc]; 73 74 vendor->base = address; 75 vendor->region_size = size; 76 return ioremap(vendor->base, vendor->region_size); 77 } 78 #else 79 #define atmel_getb(chip, offset) inb(chip->vendor->base + offset) 80 #define atmel_putb(val, chip, offset) outb(val, chip->vendor->base + offset) 81 #define atmel_request_region request_region 82 #define atmel_release_region release_region 83 /* Atmel definitions */ 84 enum tpm_atmel_addr { 85 TPM_ATMEL_BASE_ADDR_LO = 0x08, 86 TPM_ATMEL_BASE_ADDR_HI = 0x09 87 }; 88 89 /* Verify this is a 1.1 Atmel TPM */ 90 static int atmel_verify_tpm11(void) 91 { 92 93 /* verify that it is an Atmel part */ 94 if (tpm_read_index(TPM_ADDR, 4) != 'A' || 95 tpm_read_index(TPM_ADDR, 5) != 'T' || 96 tpm_read_index(TPM_ADDR, 6) != 'M' || 97 tpm_read_index(TPM_ADDR, 7) != 'L') 98 return 1; 99 100 /* query chip for its version number */ 101 if (tpm_read_index(TPM_ADDR, 0x00) != 1 || 102 tpm_read_index(TPM_ADDR, 0x01) != 1) 103 return 1; 104 105 /* This is an atmel supported part */ 106 return 0; 107 } 108 109 static inline void atmel_put_base_addr(struct tpm_vendor_specific 110 *vendor) 111 { 112 } 113 114 /* Determine where to talk to device */ 115 static void __iomem * atmel_get_base_addr(struct tpm_vendor_specific 116 *vendor) 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 vendor->base = (hi << 8) | lo; 127 vendor->region_size = 2; 128 129 return ioport_map(vendor->base, vendor->region_size); 130 } 131 #endif 132