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 struct tpm_atmel_priv { 26 int region_size; 27 int have_region; 28 unsigned long base; 29 }; 30 31 static inline struct tpm_atmel_priv *atmel_get_priv(struct tpm_chip *chip) 32 { 33 return chip->vendor.priv; 34 } 35 36 #ifdef CONFIG_PPC64 37 38 #include <asm/prom.h> 39 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 44 45 static inline void atmel_put_base_addr(void __iomem *iobase) 46 { 47 iounmap(iobase); 48 } 49 50 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size) 51 { 52 struct device_node *dn; 53 unsigned long address, size; 54 const unsigned int *reg; 55 int reglen; 56 int naddrc; 57 int nsizec; 58 59 dn = of_find_node_by_name(NULL, "tpm"); 60 61 if (!dn) 62 return NULL; 63 64 if (!of_device_is_compatible(dn, "AT97SC3201")) { 65 of_node_put(dn); 66 return NULL; 67 } 68 69 reg = of_get_property(dn, "reg", ®len); 70 naddrc = of_n_addr_cells(dn); 71 nsizec = of_n_size_cells(dn); 72 73 of_node_put(dn); 74 75 76 if (naddrc == 2) 77 address = ((unsigned long) reg[0] << 32) | reg[1]; 78 else 79 address = reg[0]; 80 81 if (nsizec == 2) 82 size = 83 ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1]; 84 else 85 size = reg[naddrc]; 86 87 *base = address; 88 *region_size = size; 89 return ioremap(*base, *region_size); 90 } 91 #else 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 */ 98 enum tpm_atmel_addr { 99 TPM_ATMEL_BASE_ADDR_LO = 0x08, 100 TPM_ATMEL_BASE_ADDR_HI = 0x09 101 }; 102 103 /* Verify this is a 1.1 Atmel TPM */ 104 static int atmel_verify_tpm11(void) 105 { 106 107 /* 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') 112 return 1; 113 114 /* query chip for its version number */ 115 if (tpm_read_index(TPM_ADDR, 0x00) != 1 || 116 tpm_read_index(TPM_ADDR, 0x01) != 1) 117 return 1; 118 119 /* This is an atmel supported part */ 120 return 0; 121 } 122 123 static inline void atmel_put_base_addr(void __iomem *iobase) 124 { 125 } 126 127 /* Determine where to talk to device */ 128 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size) 129 { 130 int lo, hi; 131 132 if (atmel_verify_tpm11() != 0) 133 return NULL; 134 135 lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO); 136 hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI); 137 138 *base = (hi << 8) | lo; 139 *region_size = 2; 140 141 return ioport_map(*base, *region_size); 142 } 143 #endif 144