Kylene Jo Hall | ad5ea3c | 2005-11-13 16:07:41 -0800 | [diff] [blame^] | 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 | static inline void atmel_put_base_addr(struct tpm_vendor_specific *vendor) |
| 31 | { |
| 32 | iounmap(vendor->iobase); |
| 33 | } |
| 34 | |
| 35 | static int atmel_get_base_addr(struct tpm_vendor_specific *vendor) |
| 36 | { |
| 37 | struct device_node *dn; |
| 38 | unsigned long address, size; |
| 39 | unsigned int *reg; |
| 40 | int reglen; |
| 41 | int naddrc; |
| 42 | int nsizec; |
| 43 | |
| 44 | dn = of_find_node_by_name(NULL, "tpm"); |
| 45 | |
| 46 | if (!dn) |
| 47 | return 1; |
| 48 | |
| 49 | if (!device_is_compatible(dn, "AT97SC3201")) { |
| 50 | of_node_put(dn); |
| 51 | return 1; |
| 52 | } |
| 53 | |
| 54 | reg = (unsigned int *) get_property(dn, "reg", ®len); |
| 55 | naddrc = prom_n_addr_cells(dn); |
| 56 | nsizec = prom_n_size_cells(dn); |
| 57 | |
| 58 | of_node_put(dn); |
| 59 | |
| 60 | |
| 61 | if (naddrc == 2) |
| 62 | address = ((unsigned long) reg[0] << 32) | reg[1]; |
| 63 | else |
| 64 | address = reg[0]; |
| 65 | |
| 66 | if (nsizec == 2) |
| 67 | size = |
| 68 | ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1]; |
| 69 | else |
| 70 | size = reg[naddrc]; |
| 71 | |
| 72 | vendor->base = address; |
| 73 | vendor->region_size = size; |
| 74 | vendor->iobase = ioremap(address, size); |
| 75 | return 0; |
| 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(struct tpm_vendor_specific *vendor) |
| 109 | { |
| 110 | } |
| 111 | |
| 112 | /* Determine where to talk to device */ |
| 113 | static unsigned long atmel_get_base_addr(struct tpm_vendor_specific |
| 114 | *vendor) |
| 115 | { |
| 116 | int lo, hi; |
| 117 | |
| 118 | if (atmel_verify_tpm11() != 0) |
| 119 | return 1; |
| 120 | |
| 121 | lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO); |
| 122 | hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI); |
| 123 | |
| 124 | vendor->base = (hi << 8) | lo; |
| 125 | vendor->region_size = 2; |
| 126 | |
| 127 | return 0; |
| 128 | } |
| 129 | #endif |