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 void __iomem *iobase; 30 }; 31 32 static inline struct tpm_atmel_priv *atmel_get_priv(struct tpm_chip *chip) 33 { 34 return chip->vendor.priv; 35 } 36 37 #ifdef CONFIG_PPC64 38 39 #include <asm/prom.h> 40 41 #define atmel_getb(priv, offset) readb(priv->iobase + offset) 42 #define atmel_putb(val, priv, offset) writeb(val, priv->iobase + offset) 43 #define atmel_request_region request_mem_region 44 #define atmel_release_region release_mem_region 45 46 static inline void atmel_put_base_addr(void __iomem *iobase) 47 { 48 iounmap(iobase); 49 } 50 51 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size) 52 { 53 struct device_node *dn; 54 unsigned long address, size; 55 const unsigned int *reg; 56 int reglen; 57 int naddrc; 58 int nsizec; 59 60 dn = of_find_node_by_name(NULL, "tpm"); 61 62 if (!dn) 63 return NULL; 64 65 if (!of_device_is_compatible(dn, "AT97SC3201")) { 66 of_node_put(dn); 67 return NULL; 68 } 69 70 reg = of_get_property(dn, "reg", ®len); 71 naddrc = of_n_addr_cells(dn); 72 nsizec = of_n_size_cells(dn); 73 74 of_node_put(dn); 75 76 77 if (naddrc == 2) 78 address = ((unsigned long) reg[0] << 32) | reg[1]; 79 else 80 address = reg[0]; 81 82 if (nsizec == 2) 83 size = 84 ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1]; 85 else 86 size = reg[naddrc]; 87 88 *base = address; 89 *region_size = size; 90 return ioremap(*base, *region_size); 91 } 92 #else 93 #define atmel_getb(chip, offset) inb(atmel_get_priv(chip)->base + offset) 94 #define atmel_putb(val, chip, offset) \ 95 outb(val, atmel_get_priv(chip)->base + offset) 96 #define atmel_request_region request_region 97 #define atmel_release_region release_region 98 /* Atmel definitions */ 99 enum tpm_atmel_addr { 100 TPM_ATMEL_BASE_ADDR_LO = 0x08, 101 TPM_ATMEL_BASE_ADDR_HI = 0x09 102 }; 103 104 /* Verify this is a 1.1 Atmel TPM */ 105 static int atmel_verify_tpm11(void) 106 { 107 108 /* verify that it is an Atmel part */ 109 if (tpm_read_index(TPM_ADDR, 4) != 'A' || 110 tpm_read_index(TPM_ADDR, 5) != 'T' || 111 tpm_read_index(TPM_ADDR, 6) != 'M' || 112 tpm_read_index(TPM_ADDR, 7) != 'L') 113 return 1; 114 115 /* query chip for its version number */ 116 if (tpm_read_index(TPM_ADDR, 0x00) != 1 || 117 tpm_read_index(TPM_ADDR, 0x01) != 1) 118 return 1; 119 120 /* This is an atmel supported part */ 121 return 0; 122 } 123 124 static inline void atmel_put_base_addr(void __iomem *iobase) 125 { 126 } 127 128 /* Determine where to talk to device */ 129 static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size) 130 { 131 int lo, hi; 132 133 if (atmel_verify_tpm11() != 0) 134 return NULL; 135 136 lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO); 137 hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI); 138 139 *base = (hi << 8) | lo; 140 *region_size = 2; 141 142 return ioport_map(*base, *region_size); 143 } 144 #endif 145