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tpm_tis.c
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tpm_tis.c
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/*
* Copyright (c) 2010-2012 United States Government, as represented by
* the Secretary of Defense. All rights reserved.
*
* This code has been derived from drivers/char/tpm.c
* from the linux kernel
*
* Copyright (C) 2004 IBM Corporation
*
* This code has also been derived from drivers/char/tpm/tpm_tis.c
* from the linux kernel
*
* Copyright (C) 2005, 2006 IBM Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, version 2
* of the License
*/
#include <mini-os/ioremap.h>
#include <mini-os/iorw.h>
#include <mini-os/tpm_tis.h>
#include <mini-os/os.h>
#include <mini-os/sched.h>
#include <mini-os/byteorder.h>
#include <mini-os/events.h>
#include <mini-os/wait.h>
#include <mini-os/xmalloc.h>
#include <errno.h>
#include <stdbool.h>
#ifndef min
#define min( a, b ) ( ((a) < (b)) ? (a) : (b) )
#endif
#define TPM_HEADER_SIZE 10
#define TPM_BUFSIZE 2048
struct tpm_input_header {
uint16_t tag;
uint32_t length;
uint32_t ordinal;
}__attribute__((packed));
struct tpm_output_header {
uint16_t tag;
uint32_t length;
uint32_t return_code;
}__attribute__((packed));
struct stclear_flags_t {
uint16_t tag;
uint8_t deactivated;
uint8_t disableForceClear;
uint8_t physicalPresence;
uint8_t physicalPresenceLock;
uint8_t bGlobalLock;
}__attribute__((packed));
struct tpm_version_t {
uint8_t Major;
uint8_t Minor;
uint8_t revMajor;
uint8_t revMinor;
}__attribute__((packed));
struct tpm_version_1_2_t {
uint16_t tag;
uint8_t Major;
uint8_t Minor;
uint8_t revMajor;
uint8_t revMinor;
}__attribute__((packed));
struct timeout_t {
uint32_t a;
uint32_t b;
uint32_t c;
uint32_t d;
}__attribute__((packed));
struct duration_t {
uint32_t tpm_short;
uint32_t tpm_medium;
uint32_t tpm_long;
}__attribute__((packed));
struct permanent_flags_t {
uint16_t tag;
uint8_t disable;
uint8_t ownership;
uint8_t deactivated;
uint8_t readPubek;
uint8_t disableOwnerClear;
uint8_t allowMaintenance;
uint8_t physicalPresenceLifetimeLock;
uint8_t physicalPresenceHWEnable;
uint8_t physicalPresenceCMDEnable;
uint8_t CEKPUsed;
uint8_t TPMpost;
uint8_t TPMpostLock;
uint8_t FIPS;
uint8_t operator;
uint8_t enableRevokeEK;
uint8_t nvLocked;
uint8_t readSRKPub;
uint8_t tpmEstablished;
uint8_t maintenanceDone;
uint8_t disableFullDALogicInfo;
}__attribute__((packed));
typedef union {
struct permanent_flags_t perm_flags;
struct stclear_flags_t stclear_flags;
bool owned;
uint32_t num_pcrs;
struct tpm_version_t tpm_version;
struct tpm_version_1_2_t tpm_version_1_2;
uint32_t manufacturer_id;
struct timeout_t timeout;
struct duration_t duration;
} cap_t;
struct tpm_getcap_params_in {
uint32_t cap;
uint32_t subcap_size;
uint32_t subcap;
}__attribute__((packed));
struct tpm_getcap_params_out {
uint32_t cap_size;
cap_t cap;
}__attribute__((packed));
struct tpm_readpubek_params_out {
uint8_t algorithm[4];
uint8_t encscheme[2];
uint8_t sigscheme[2];
uint32_t paramsize;
uint8_t parameters[12]; /*assuming RSA*/
uint32_t keysize;
uint8_t modulus[256];
uint8_t checksum[20];
}__attribute__((packed));
typedef union {
struct tpm_input_header in;
struct tpm_output_header out;
} tpm_cmd_header;
#define TPM_DIGEST_SIZE 20
struct tpm_pcrread_out {
uint8_t pcr_result[TPM_DIGEST_SIZE];
}__attribute__((packed));
struct tpm_pcrread_in {
uint32_t pcr_idx;
}__attribute__((packed));
struct tpm_pcrextend_in {
uint32_t pcr_idx;
uint8_t hash[TPM_DIGEST_SIZE];
}__attribute__((packed));
typedef union {
struct tpm_getcap_params_out getcap_out;
struct tpm_readpubek_params_out readpubek_out;
uint8_t readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
struct tpm_getcap_params_in getcap_in;
struct tpm_pcrread_in pcrread_in;
struct tpm_pcrread_out pcrread_out;
struct tpm_pcrextend_in pcrextend_in;
} tpm_cmd_params;
struct tpm_cmd_t {
tpm_cmd_header header;
tpm_cmd_params params;
}__attribute__((packed));
enum tpm_duration {
TPM_SHORT = 0,
TPM_MEDIUM = 1,
TPM_LONG = 2,
TPM_UNDEFINED,
};
#define TPM_MAX_ORDINAL 243
#define TPM_MAX_PROTECTED_ORDINAL 12
#define TPM_PROTECTED_ORDINAL_MASK 0xFF
extern const uint8_t tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL];
extern const uint8_t tpm_ordinal_duration[TPM_MAX_ORDINAL];
#define TPM_DIGEST_SIZE 20
#define TPM_ERROR_SIZE 10
#define TPM_RET_CODE_IDX 6
/* tpm_capabilities */
#define TPM_CAP_FLAG cpu_to_be32(4)
#define TPM_CAP_PROP cpu_to_be32(5)
#define CAP_VERSION_1_1 cpu_to_be32(0x06)
#define CAP_VERSION_1_2 cpu_to_be32(0x1A)
/* tpm_sub_capabilities */
#define TPM_CAP_PROP_PCR cpu_to_be32(0x101)
#define TPM_CAP_PROP_MANUFACTURER cpu_to_be32(0x103)
#define TPM_CAP_FLAG_PERM cpu_to_be32(0x108)
#define TPM_CAP_FLAG_VOL cpu_to_be32(0x109)
#define TPM_CAP_PROP_OWNER cpu_to_be32(0x111)
#define TPM_CAP_PROP_TIS_TIMEOUT cpu_to_be32(0x115)
#define TPM_CAP_PROP_TIS_DURATION cpu_to_be32(0x120)
#define TPM_INTERNAL_RESULT_SIZE 200
#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
#define TPM_ORD_GET_CAP cpu_to_be32(101)
extern const struct tpm_input_header tpm_getcap_header;
const uint8_t tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
TPM_UNDEFINED, /* 0 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 5 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 10 */
TPM_SHORT,
};
const uint8_t tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
TPM_UNDEFINED, /* 0 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 5 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 10 */
TPM_SHORT,
TPM_MEDIUM,
TPM_LONG,
TPM_LONG,
TPM_MEDIUM, /* 15 */
TPM_SHORT,
TPM_SHORT,
TPM_MEDIUM,
TPM_LONG,
TPM_SHORT, /* 20 */
TPM_SHORT,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_SHORT, /* 25 */
TPM_SHORT,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_MEDIUM, /* 30 */
TPM_LONG,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT, /* 35 */
TPM_MEDIUM,
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_MEDIUM, /* 40 */
TPM_LONG,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT, /* 45 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_LONG,
TPM_MEDIUM, /* 50 */
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 55 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_MEDIUM, /* 60 */
TPM_MEDIUM,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_MEDIUM, /* 65 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 70 */
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 75 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_LONG, /* 80 */
TPM_UNDEFINED,
TPM_MEDIUM,
TPM_LONG,
TPM_SHORT,
TPM_UNDEFINED, /* 85 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 90 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED, /* 95 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_MEDIUM, /* 100 */
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 105 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 110 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT, /* 115 */
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_LONG, /* 120 */
TPM_LONG,
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_SHORT,
TPM_SHORT, /* 125 */
TPM_SHORT,
TPM_LONG,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT, /* 130 */
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_SHORT,
TPM_MEDIUM,
TPM_UNDEFINED, /* 135 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 140 */
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 145 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 150 */
TPM_MEDIUM,
TPM_MEDIUM,
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED, /* 155 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 160 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 165 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_LONG, /* 170 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 175 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_MEDIUM, /* 180 */
TPM_SHORT,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_MEDIUM, /* 185 */
TPM_SHORT,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 190 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 195 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 200 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT,
TPM_SHORT, /* 205 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_MEDIUM, /* 210 */
TPM_UNDEFINED,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_MEDIUM,
TPM_UNDEFINED, /* 215 */
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT,
TPM_SHORT, /* 220 */
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_SHORT,
TPM_UNDEFINED, /* 225 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 230 */
TPM_LONG,
TPM_MEDIUM,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED, /* 235 */
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_UNDEFINED,
TPM_SHORT, /* 240 */
TPM_UNDEFINED,
TPM_MEDIUM,
};
const struct tpm_input_header tpm_getcap_header = {
.tag = TPM_TAG_RQU_COMMAND,
.length = cpu_to_be32(22),
.ordinal = TPM_ORD_GET_CAP
};
enum tis_access {
TPM_ACCESS_VALID = 0x80,
TPM_ACCESS_ACTIVE_LOCALITY = 0x20, /* (R) */
TPM_ACCESS_RELINQUISH_LOCALITY = 0x20,/* (W) */
TPM_ACCESS_REQUEST_PENDING = 0x04, /* (W) */
TPM_ACCESS_REQUEST_USE = 0x02, /* (W) */
};
enum tis_status {
TPM_STS_VALID = 0x80, /* (R) */
TPM_STS_COMMAND_READY = 0x40, /* (R) */
TPM_STS_DATA_AVAIL = 0x10, /* (R) */
TPM_STS_DATA_EXPECT = 0x08, /* (R) */
TPM_STS_GO = 0x20, /* (W) */
};
enum tis_int_flags {
TPM_GLOBAL_INT_ENABLE = 0x80000000,
TPM_INTF_BURST_COUNT_STATIC = 0x100,
TPM_INTF_CMD_READY_INT = 0x080,
TPM_INTF_INT_EDGE_FALLING = 0x040,
TPM_INTF_INT_EDGE_RISING = 0x020,
TPM_INTF_INT_LEVEL_LOW = 0x010,
TPM_INTF_INT_LEVEL_HIGH = 0x008,
TPM_INTF_LOCALITY_CHANGE_INT = 0x004,
TPM_INTF_STS_VALID_INT = 0x002,
TPM_INTF_DATA_AVAIL_INT = 0x001,
};
enum tis_defaults {
TIS_MEM_BASE = 0xFED40000,
TIS_MEM_LEN = 0x5000,
TIS_SHORT_TIMEOUT = 750, /*ms*/
TIS_LONG_TIMEOUT = 2000, /*2 sec */
};
#define TPM_TIMEOUT 5
#define TPM_ACCESS(t, l) (((uint8_t*)t->pages[l]) + 0x0000)
#define TPM_INT_ENABLE(t, l) ((uint32_t*)(((uint8_t*)t->pages[l]) + 0x0008))
#define TPM_INT_VECTOR(t, l) (((uint8_t*)t->pages[l]) + 0x000C)
#define TPM_INT_STATUS(t, l) (((uint8_t*)t->pages[l]) + 0x0010)
#define TPM_INTF_CAPS(t, l) ((uint32_t*)(((uint8_t*)t->pages[l]) + 0x0014))
#define TPM_STS(t, l) ((uint8_t*)(((uint8_t*)t->pages[l]) + 0x0018))
#define TPM_DATA_FIFO(t, l) (((uint8_t*)t->pages[l]) + 0x0024)
#define TPM_DID_VID(t, l) ((uint32_t*)(((uint8_t*)t->pages[l]) + 0x0F00))
#define TPM_RID(t, l) (((uint8_t*)t->pages[l]) + 0x0F04)
struct tpm_chip {
int enabled_localities;
int locality;
unsigned long baseaddr;
uint8_t* pages[5];
int did, vid, rid;
uint8_t data_buffer[TPM_BUFSIZE];
int data_len;
s_time_t timeout_a, timeout_b, timeout_c, timeout_d;
s_time_t duration[3];
#ifdef HAVE_LIBC
int fd;
#endif
unsigned int irq;
struct wait_queue_head read_queue;
struct wait_queue_head int_queue;
};
static void __init_tpm_chip(struct tpm_chip* tpm) {
tpm->enabled_localities = TPM_TIS_EN_LOCLALL;
tpm->locality = -1;
tpm->baseaddr = 0;
tpm->pages[0] = tpm->pages[1] = tpm->pages[2] = tpm->pages[3] = tpm->pages[4] = NULL;
tpm->vid = 0;
tpm->did = 0;
tpm->irq = 0;
init_waitqueue_head(&tpm->read_queue);
init_waitqueue_head(&tpm->int_queue);
tpm->data_len = -1;
#ifdef HAVE_LIBC
tpm->fd = -1;
#endif
}
/*
* Returns max number of nsecs to wait
*/
s_time_t tpm_calc_ordinal_duration(struct tpm_chip *chip,
uint32_t ordinal)
{
int duration_idx = TPM_UNDEFINED;
s_time_t duration = 0;
if (ordinal < TPM_MAX_ORDINAL)
duration_idx = tpm_ordinal_duration[ordinal];
else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
TPM_MAX_PROTECTED_ORDINAL)
duration_idx =
tpm_protected_ordinal_duration[ordinal &
TPM_PROTECTED_ORDINAL_MASK];
if (duration_idx != TPM_UNDEFINED) {
duration = chip->duration[duration_idx];
}
if (duration <= 0) {
return SECONDS(120);
}
else
{
return duration;
}
}
static int locality_enabled(struct tpm_chip* tpm, int l) {
return tpm->enabled_localities & (1 << l);
}
static int check_locality(struct tpm_chip* tpm, int l) {
if(locality_enabled(tpm, l) && (ioread8(TPM_ACCESS(tpm, l)) &
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
(TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
return l;
}
return -1;
}
void release_locality(struct tpm_chip* tpm, int l, int force)
{
if (locality_enabled(tpm, l) && (force || (ioread8(TPM_ACCESS(tpm, l)) &
(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
(TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID))) {
iowrite8(TPM_ACCESS(tpm, l), TPM_ACCESS_RELINQUISH_LOCALITY);
}
}
int tpm_tis_request_locality(struct tpm_chip* tpm, int l) {
s_time_t stop;
/*Make sure locality is valid */
if(!locality_enabled(tpm, l)) {
printk("tpm_tis_change_locality() Tried to change to locality %d, but it is disabled or invalid!\n", l);
return -1;
}
/* Check if we already have the current locality */
if(check_locality(tpm, l) >= 0) {
return tpm->locality = l;
}
/* Set the new locality*/
iowrite8(TPM_ACCESS(tpm, l), TPM_ACCESS_REQUEST_USE);
if(tpm->irq) {
/* Wait for interrupt */
wait_event_deadline(tpm->int_queue, (check_locality(tpm, l) >= 0), NOW() + tpm->timeout_a);
/* FIXME: Handle timeout event, should return error in that case */
return l;
} else {
/* Wait for burstcount */
stop = NOW() + tpm->timeout_a;
do {
if(check_locality(tpm, l) >= 0) {
return tpm->locality = l;
}
msleep(TPM_TIMEOUT);
} while(NOW() < stop);
}
printk("REQ LOCALITY FAILURE\n");
return -1;
}
static uint8_t tpm_tis_status(struct tpm_chip* tpm) {
return ioread8(TPM_STS(tpm, tpm->locality));
}
/* This causes the current command to be aborted */
static void tpm_tis_ready(struct tpm_chip* tpm) {
iowrite8(TPM_STS(tpm, tpm->locality), TPM_STS_COMMAND_READY);
}
#define tpm_tis_cancel_cmd(v) tpm_tis_ready(v)
static int get_burstcount(struct tpm_chip* tpm) {
s_time_t stop;
int burstcnt;
stop = NOW() + tpm->timeout_d;
do {
burstcnt = ioread8((TPM_STS(tpm, tpm->locality) + 1));
burstcnt += ioread8(TPM_STS(tpm, tpm->locality) + 2) << 8;
if (burstcnt) {
return burstcnt;
}
msleep(TPM_TIMEOUT);
} while(NOW() < stop);
return -EBUSY;
}
static int wait_for_stat(struct tpm_chip* tpm, uint8_t mask,
unsigned long timeout, struct wait_queue_head* queue) {
s_time_t stop;
uint8_t status;
status = tpm_tis_status(tpm);
if((status & mask) == mask) {
return 0;
}
if(tpm->irq) {
wait_event_deadline(*queue, ((tpm_tis_status(tpm) & mask) == mask), timeout);
/* FIXME: Check for timeout and return -ETIME */
return 0;
} else {
stop = NOW() + timeout;
do {
msleep(TPM_TIMEOUT);
status = tpm_tis_status(tpm);
if((status & mask) == mask)
return 0;
} while( NOW() < stop);
}
return -ETIME;
}
static int recv_data(struct tpm_chip* tpm, uint8_t* buf, size_t count) {
int size = 0;
int burstcnt;
while( size < count &&
wait_for_stat(tpm,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
tpm->timeout_c,
&tpm->read_queue)
== 0) {
burstcnt = get_burstcount(tpm);
for(; burstcnt > 0 && size < count; --burstcnt)
{
buf[size++] = ioread8(TPM_DATA_FIFO(tpm, tpm->locality));
}
}
return size;
}
int tpm_tis_recv(struct tpm_chip* tpm, uint8_t* buf, size_t count) {
int size = 0;
int expected, status;
if (count < TPM_HEADER_SIZE) {
size = -EIO;
goto out;
}
/* read first 10 bytes, including tag, paramsize, and result */
if((size =
recv_data(tpm, buf, TPM_HEADER_SIZE)) < TPM_HEADER_SIZE) {
printk("Error reading tpm cmd header\n");
goto out;
}
expected = be32_to_cpu(*((uint32_t*)(buf + 2)));
if(expected > count) {
size = -EIO;
goto out;
}
if((size += recv_data(tpm, & buf[TPM_HEADER_SIZE],
expected - TPM_HEADER_SIZE)) < expected) {
printk("Unable to read rest of tpm command size=%d expected=%d\n", size, expected);
size = -ETIME;
goto out;
}
wait_for_stat(tpm, TPM_STS_VALID, tpm->timeout_c, &tpm->int_queue);
status = tpm_tis_status(tpm);
if(status & TPM_STS_DATA_AVAIL) {
printk("Error: left over data\n");
size = -EIO;
goto out;
}
out:
tpm_tis_ready(tpm);
release_locality(tpm, tpm->locality, 0);
return size;
}
int tpm_tis_send(struct tpm_chip* tpm, uint8_t* buf, size_t len) {
int rc;
int status, burstcnt = 0;
int count = 0;
uint32_t ordinal;
if(tpm_tis_request_locality(tpm, tpm->locality) < 0) {
return -EBUSY;
}
status = tpm_tis_status(tpm);
if((status & TPM_STS_COMMAND_READY) == 0) {
tpm_tis_ready(tpm);
if(wait_for_stat(tpm, TPM_STS_COMMAND_READY, tpm->timeout_b, &tpm->int_queue) < 0) {
rc = -ETIME;
goto out_err;
}
}
while(count < len - 1) {
burstcnt = get_burstcount(tpm);
for(;burstcnt > 0 && count < len -1; --burstcnt) {
iowrite8(TPM_DATA_FIFO(tpm, tpm->locality), buf[count++]);
}
wait_for_stat(tpm, TPM_STS_VALID, tpm->timeout_c, &tpm->int_queue);
status = tpm_tis_status(tpm);
if((status & TPM_STS_DATA_EXPECT) == 0) {
rc = -EIO;
goto out_err;
}
}
/*Write last byte*/
iowrite8(TPM_DATA_FIFO(tpm, tpm->locality), buf[count]);
wait_for_stat(tpm, TPM_STS_VALID, tpm->timeout_c, &tpm->read_queue);
status = tpm_tis_status(tpm);
if((status & TPM_STS_DATA_EXPECT) != 0) {
rc = -EIO;
goto out_err;
}
/*go and do it*/
iowrite8(TPM_STS(tpm, tpm->locality), TPM_STS_GO);
if(tpm->irq) {
/*Wait for interrupt */
ordinal = be32_to_cpu(*(buf + 6));
if(wait_for_stat(tpm,
TPM_STS_DATA_AVAIL | TPM_STS_VALID,
tpm_calc_ordinal_duration(tpm, ordinal),
&tpm->read_queue) < 0) {
rc = -ETIME;
goto out_err;
}
}
#ifdef HAVE_LIBC
if(tpm->fd >= 0) {
files[tpm->fd].read = 0;
files[tpm->fd].tpm_tis.respgot = 0;
files[tpm->fd].tpm_tis.offset = 0;
}
#endif
return len;
out_err:
tpm_tis_ready(tpm);
release_locality(tpm, tpm->locality, 0);
return rc;
}
static void tpm_tis_irq_handler(evtchn_port_t port, struct pt_regs *regs, void* data)
{
struct tpm_chip* tpm = data;
uint32_t interrupt;
int i;
interrupt = ioread32(TPM_INT_STATUS(tpm, tpm->locality));
if(interrupt == 0) {
return;
}
if(interrupt & TPM_INTF_DATA_AVAIL_INT) {
wake_up(&tpm->read_queue);
}
if(interrupt & TPM_INTF_LOCALITY_CHANGE_INT) {
for(i = 0; i < 5; ++i) {
if(check_locality(tpm, i) >= 0) {
break;
}
}
}
if(interrupt & (TPM_INTF_LOCALITY_CHANGE_INT | TPM_INTF_STS_VALID_INT |
TPM_INTF_CMD_READY_INT)) {
wake_up(&tpm->int_queue);
}
/* Clear interrupts handled with TPM_EOI */
iowrite32(TPM_INT_STATUS(tpm, tpm->locality), interrupt);
ioread32(TPM_INT_STATUS(tpm, tpm->locality));
return;
}
/*
* Internal kernel interface to transmit TPM commands
*/
static ssize_t tpm_transmit(struct tpm_chip *chip, const uint8_t *buf,
size_t bufsiz)
{
ssize_t rc;
uint32_t count, ordinal;
s_time_t stop;
count = be32_to_cpu(*((uint32_t *) (buf + 2)));
ordinal = be32_to_cpu(*((uint32_t *) (buf + 6)));
if (count == 0)
return -ENODATA;
if (count > bufsiz) {
printk("Error: invalid count value %x %zx \n", count, bufsiz);
return -E2BIG;
}
//down(&chip->tpm_mutex);
if ((rc = tpm_tis_send(chip, (uint8_t *) buf, count)) < 0) {
printk("tpm_transmit: tpm_send: error %ld\n", rc);
goto out;
}
if (chip->irq)
goto out_recv;
stop = NOW() + tpm_calc_ordinal_duration(chip, ordinal);
do {
uint8_t status = tpm_tis_status(chip);
if ((status & (TPM_STS_DATA_AVAIL | TPM_STS_VALID)) ==
(TPM_STS_DATA_AVAIL | TPM_STS_VALID))
goto out_recv;
if ((status == TPM_STS_COMMAND_READY)) {
printk("TPM Error: Operation Canceled\n");
rc = -ECANCELED;
goto out;
}
msleep(TPM_TIMEOUT); /* CHECK */
rmb();
} while (NOW() < stop);
/* Cancel the command */
tpm_tis_cancel_cmd(chip);
printk("TPM Operation Timed out\n");
rc = -ETIME;
goto out;
out_recv:
if((rc = tpm_tis_recv(chip, (uint8_t *) buf, bufsiz)) < 0) {
printk("tpm_transmit: tpm_recv: error %d\n", rc);
}
out:
//up(&chip->tpm_mutex);
return rc;
}
static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
int len, const char *desc)
{
int err;
len = tpm_transmit(chip,(uint8_t *) cmd, len);
if (len < 0)
return len;
if (len == TPM_ERROR_SIZE) {
err = be32_to_cpu(cmd->header.out.return_code);
printk("A TPM error (%d) occurred %s\n", err, desc);
return err;
}
return 0;
}
int tpm_get_timeouts(struct tpm_chip *chip)
{
struct tpm_cmd_t tpm_cmd;
struct timeout_t *timeout_cap;
struct duration_t *duration_cap;
ssize_t rc;
uint32_t timeout;
unsigned int scale = 1;
tpm_cmd.header.in = tpm_getcap_header;
tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
if((rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
"attempting to determine the timeouts")) != 0) {
printk("transmit failed %d\n", rc);
goto duration;
}
if(be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
be32_to_cpu(tpm_cmd.header.out.length) !=
sizeof(tpm_cmd.header.out) + sizeof(uint32_t) + 4 * sizeof(uint32_t)) {
return -EINVAL;
}
timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
/* Don't overwrite default if value is 0 */
timeout = be32_to_cpu(timeout_cap->a);
if(timeout && timeout < 1000) {
/* timeouts in msc rather usec */
scale = 1000;
}
if (timeout)
chip->timeout_a = MICROSECS(timeout * scale); /*Convert to msec */
timeout = be32_to_cpu(timeout_cap->b);
if (timeout)