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