1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2005, 2006 IBM Corporation 4 * Copyright (C) 2014, 2015 Intel Corporation 5 * 6 * Authors: 7 * Leendert van Doorn <leendert@watson.ibm.com> 8 * Kylene Hall <kjhall@us.ibm.com> 9 * 10 * Maintained by: <tpmdd-devel@lists.sourceforge.net> 11 * 12 * Device driver for TCG/TCPA TPM (trusted platform module). 13 * Specifications at www.trustedcomputinggroup.org 14 * 15 * This device driver implements the TPM interface as defined in 16 * the TCG TPM Interface Spec version 1.2, revision 1.0. 17 */ 18 19 #ifndef __TPM_TIS_CORE_H__ 20 #define __TPM_TIS_CORE_H__ 21 22 #include "tpm.h" 23 24 enum tis_access { 25 TPM_ACCESS_VALID = 0x80, 26 TPM_ACCESS_ACTIVE_LOCALITY = 0x20, 27 TPM_ACCESS_REQUEST_PENDING = 0x04, 28 TPM_ACCESS_REQUEST_USE = 0x02, 29 }; 30 31 enum tis_status { 32 TPM_STS_VALID = 0x80, 33 TPM_STS_COMMAND_READY = 0x40, 34 TPM_STS_GO = 0x20, 35 TPM_STS_DATA_AVAIL = 0x10, 36 TPM_STS_DATA_EXPECT = 0x08, 37 TPM_STS_READ_ZERO = 0x23, /* bits that must be zero on read */ 38 }; 39 40 enum tis_int_flags { 41 TPM_GLOBAL_INT_ENABLE = 0x80000000, 42 TPM_INTF_BURST_COUNT_STATIC = 0x100, 43 TPM_INTF_CMD_READY_INT = 0x080, 44 TPM_INTF_INT_EDGE_FALLING = 0x040, 45 TPM_INTF_INT_EDGE_RISING = 0x020, 46 TPM_INTF_INT_LEVEL_LOW = 0x010, 47 TPM_INTF_INT_LEVEL_HIGH = 0x008, 48 TPM_INTF_LOCALITY_CHANGE_INT = 0x004, 49 TPM_INTF_STS_VALID_INT = 0x002, 50 TPM_INTF_DATA_AVAIL_INT = 0x001, 51 }; 52 53 enum tis_defaults { 54 TIS_MEM_LEN = 0x5000, 55 TIS_SHORT_TIMEOUT = 750, /* ms */ 56 TIS_LONG_TIMEOUT = 2000, /* 2 sec */ 57 TIS_TIMEOUT_MIN_ATML = 14700, /* usecs */ 58 TIS_TIMEOUT_MAX_ATML = 15000, /* usecs */ 59 }; 60 61 /* Some timeout values are needed before it is known whether the chip is 62 * TPM 1.0 or TPM 2.0. 63 */ 64 #define TIS_TIMEOUT_A_MAX max_t(int, TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_A) 65 #define TIS_TIMEOUT_B_MAX max_t(int, TIS_LONG_TIMEOUT, TPM2_TIMEOUT_B) 66 #define TIS_TIMEOUT_C_MAX max_t(int, TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_C) 67 #define TIS_TIMEOUT_D_MAX max_t(int, TIS_SHORT_TIMEOUT, TPM2_TIMEOUT_D) 68 69 #define TPM_ACCESS(l) (0x0000 | ((l) << 12)) 70 #define TPM_INT_ENABLE(l) (0x0008 | ((l) << 12)) 71 #define TPM_INT_VECTOR(l) (0x000C | ((l) << 12)) 72 #define TPM_INT_STATUS(l) (0x0010 | ((l) << 12)) 73 #define TPM_INTF_CAPS(l) (0x0014 | ((l) << 12)) 74 #define TPM_STS(l) (0x0018 | ((l) << 12)) 75 #define TPM_STS3(l) (0x001b | ((l) << 12)) 76 #define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12)) 77 78 #define TPM_DID_VID(l) (0x0F00 | ((l) << 12)) 79 #define TPM_RID(l) (0x0F04 | ((l) << 12)) 80 81 #define LPC_CNTRL_OFFSET 0x84 82 #define LPC_CLKRUN_EN (1 << 2) 83 #define INTEL_LEGACY_BLK_BASE_ADDR 0xFED08000 84 #define ILB_REMAP_SIZE 0x100 85 86 enum tpm_tis_flags { 87 TPM_TIS_ITPM_WORKAROUND = BIT(0), 88 TPM_TIS_INVALID_STATUS = BIT(1), 89 TPM_TIS_DEFAULT_CANCELLATION = BIT(2), 90 }; 91 92 struct tpm_tis_data { 93 u16 manufacturer_id; 94 int locality; 95 int irq; 96 bool irq_tested; 97 unsigned long flags; 98 void __iomem *ilb_base_addr; 99 u16 clkrun_enabled; 100 wait_queue_head_t int_queue; 101 wait_queue_head_t read_queue; 102 const struct tpm_tis_phy_ops *phy_ops; 103 unsigned short rng_quality; 104 unsigned int timeout_min; /* usecs */ 105 unsigned int timeout_max; /* usecs */ 106 }; 107 108 /* 109 * IO modes to indicate how many bytes should be read/written at once in the 110 * tpm_tis_phy_ops read_bytes/write_bytes calls. Use TPM_TIS_PHYS_8 to 111 * receive/transmit byte-wise, TPM_TIS_PHYS_16 for two bytes etc. 112 */ 113 enum tpm_tis_io_mode { 114 TPM_TIS_PHYS_8, 115 TPM_TIS_PHYS_16, 116 TPM_TIS_PHYS_32, 117 }; 118 119 struct tpm_tis_phy_ops { 120 /* data is passed in little endian */ 121 int (*read_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, 122 u8 *result, enum tpm_tis_io_mode mode); 123 int (*write_bytes)(struct tpm_tis_data *data, u32 addr, u16 len, 124 const u8 *value, enum tpm_tis_io_mode mode); 125 int (*verify_crc)(struct tpm_tis_data *data, size_t len, 126 const u8 *value); 127 }; 128 129 static inline int tpm_tis_read_bytes(struct tpm_tis_data *data, u32 addr, 130 u16 len, u8 *result) 131 { 132 return data->phy_ops->read_bytes(data, addr, len, result, 133 TPM_TIS_PHYS_8); 134 } 135 136 static inline int tpm_tis_read8(struct tpm_tis_data *data, u32 addr, u8 *result) 137 { 138 return data->phy_ops->read_bytes(data, addr, 1, result, TPM_TIS_PHYS_8); 139 } 140 141 static inline int tpm_tis_read16(struct tpm_tis_data *data, u32 addr, 142 u16 *result) 143 { 144 __le16 result_le; 145 int rc; 146 147 rc = data->phy_ops->read_bytes(data, addr, sizeof(u16), 148 (u8 *)&result_le, TPM_TIS_PHYS_16); 149 if (!rc) 150 *result = le16_to_cpu(result_le); 151 152 return rc; 153 } 154 155 static inline int tpm_tis_read32(struct tpm_tis_data *data, u32 addr, 156 u32 *result) 157 { 158 __le32 result_le; 159 int rc; 160 161 rc = data->phy_ops->read_bytes(data, addr, sizeof(u32), 162 (u8 *)&result_le, TPM_TIS_PHYS_32); 163 if (!rc) 164 *result = le32_to_cpu(result_le); 165 166 return rc; 167 } 168 169 static inline int tpm_tis_write_bytes(struct tpm_tis_data *data, u32 addr, 170 u16 len, const u8 *value) 171 { 172 return data->phy_ops->write_bytes(data, addr, len, value, 173 TPM_TIS_PHYS_8); 174 } 175 176 static inline int tpm_tis_write8(struct tpm_tis_data *data, u32 addr, u8 value) 177 { 178 return data->phy_ops->write_bytes(data, addr, 1, &value, 179 TPM_TIS_PHYS_8); 180 } 181 182 static inline int tpm_tis_write32(struct tpm_tis_data *data, u32 addr, 183 u32 value) 184 { 185 __le32 value_le; 186 int rc; 187 188 value_le = cpu_to_le32(value); 189 rc = data->phy_ops->write_bytes(data, addr, sizeof(u32), 190 (u8 *)&value_le, TPM_TIS_PHYS_32); 191 return rc; 192 } 193 194 static inline int tpm_tis_verify_crc(struct tpm_tis_data *data, size_t len, 195 const u8 *value) 196 { 197 if (!data->phy_ops->verify_crc) 198 return 0; 199 return data->phy_ops->verify_crc(data, len, value); 200 } 201 202 static inline bool is_bsw(void) 203 { 204 #ifdef CONFIG_X86 205 return ((boot_cpu_data.x86_model == INTEL_FAM6_ATOM_AIRMONT) ? 1 : 0); 206 #else 207 return false; 208 #endif 209 } 210 211 void tpm_tis_remove(struct tpm_chip *chip); 212 int tpm_tis_core_init(struct device *dev, struct tpm_tis_data *priv, int irq, 213 const struct tpm_tis_phy_ops *phy_ops, 214 acpi_handle acpi_dev_handle); 215 216 #ifdef CONFIG_PM_SLEEP 217 int tpm_tis_resume(struct device *dev); 218 #endif 219 220 #endif 221