630 lines
12 KiB
C
630 lines
12 KiB
C
/*
|
|
* Copyright (C) 2011 Infineon Technologies
|
|
*
|
|
* Authors:
|
|
* Peter Huewe <huewe.external@infineon.com>
|
|
*
|
|
* Description:
|
|
* Device driver for TCG/TCPA TPM (trusted platform module).
|
|
* Specifications at www.trustedcomputinggroup.org
|
|
*
|
|
* It is based on the Linux kernel driver tpm.c from Leendert van
|
|
* Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
|
|
*
|
|
* Version: 2.1.1
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <config.h>
|
|
#include <common.h>
|
|
#include <compiler.h>
|
|
#include <fdtdec.h>
|
|
#include <i2c.h>
|
|
#include <tpm.h>
|
|
#include <asm-generic/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/unaligned/be_byteshift.h>
|
|
|
|
#include "tpm_private.h"
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
/* TPM configuration */
|
|
struct tpm {
|
|
int i2c_bus;
|
|
int slave_addr;
|
|
char inited;
|
|
int old_bus;
|
|
} tpm;
|
|
|
|
/* Global structure for tpm chip data */
|
|
static struct tpm_chip g_chip;
|
|
|
|
enum tpm_duration {
|
|
TPM_SHORT = 0,
|
|
TPM_MEDIUM = 1,
|
|
TPM_LONG = 2,
|
|
TPM_UNDEFINED,
|
|
};
|
|
|
|
/* Extended error numbers from linux (see errno.h) */
|
|
#define ECANCELED 125 /* Operation Canceled */
|
|
|
|
/* Timer frequency. Corresponds to msec timer resolution*/
|
|
#define HZ 1000
|
|
|
|
#define TPM_MAX_ORDINAL 243
|
|
#define TPM_MAX_PROTECTED_ORDINAL 12
|
|
#define TPM_PROTECTED_ORDINAL_MASK 0xFF
|
|
|
|
#define TPM_CMD_COUNT_BYTE 2
|
|
#define TPM_CMD_ORDINAL_BYTE 6
|
|
|
|
/*
|
|
* Array with one entry per ordinal defining the maximum amount
|
|
* of time the chip could take to return the result. The ordinal
|
|
* designation of short, medium or long is defined in a table in
|
|
* TCG Specification TPM Main Part 2 TPM Structures Section 17. The
|
|
* values of the SHORT, MEDIUM, and LONG durations are retrieved
|
|
* from the chip during initialization with a call to tpm_get_timeouts.
|
|
*/
|
|
static const u8 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,
|
|
};
|
|
|
|
static const u8 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,
|
|
};
|
|
|
|
/* Returns max number of milliseconds to wait */
|
|
static unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
|
|
u32 ordinal)
|
|
{
|
|
int duration_idx = TPM_UNDEFINED;
|
|
int 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->vendor.duration[duration_idx];
|
|
|
|
if (duration <= 0)
|
|
return 2 * 60 * HZ; /* Two minutes timeout */
|
|
else
|
|
return duration;
|
|
}
|
|
|
|
static ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz)
|
|
{
|
|
ssize_t rc;
|
|
u32 count, ordinal;
|
|
unsigned long start, stop;
|
|
|
|
struct tpm_chip *chip = &g_chip;
|
|
|
|
/* switch endianess: big->little */
|
|
count = get_unaligned_be32(buf + TPM_CMD_COUNT_BYTE);
|
|
ordinal = get_unaligned_be32(buf + TPM_CMD_ORDINAL_BYTE);
|
|
|
|
if (count == 0) {
|
|
error("no data\n");
|
|
return -ENODATA;
|
|
}
|
|
if (count > bufsiz) {
|
|
error("invalid count value %x %zx\n", count, bufsiz);
|
|
return -E2BIG;
|
|
}
|
|
|
|
rc = chip->vendor.send(chip, (u8 *)buf, count);
|
|
if (rc < 0) {
|
|
error("tpm_transmit: tpm_send: error %zd\n", rc);
|
|
goto out;
|
|
}
|
|
|
|
if (chip->vendor.irq)
|
|
goto out_recv;
|
|
|
|
start = get_timer(0);
|
|
stop = tpm_calc_ordinal_duration(chip, ordinal);
|
|
do {
|
|
debug("waiting for status...\n");
|
|
u8 status = chip->vendor.status(chip);
|
|
if ((status & chip->vendor.req_complete_mask) ==
|
|
chip->vendor.req_complete_val) {
|
|
debug("...got it;\n");
|
|
goto out_recv;
|
|
}
|
|
|
|
if ((status == chip->vendor.req_canceled)) {
|
|
error("Operation Canceled\n");
|
|
rc = -ECANCELED;
|
|
goto out;
|
|
}
|
|
udelay(TPM_TIMEOUT * 1000);
|
|
} while (get_timer(start) < stop);
|
|
|
|
chip->vendor.cancel(chip);
|
|
error("Operation Timed out\n");
|
|
rc = -ETIME;
|
|
goto out;
|
|
|
|
out_recv:
|
|
debug("out_recv: reading response...\n");
|
|
rc = chip->vendor.recv(chip, (u8 *)buf, TPM_BUFSIZE);
|
|
if (rc < 0)
|
|
error("tpm_transmit: tpm_recv: error %zd\n", rc);
|
|
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
static int tpm_open(uint32_t dev_addr)
|
|
{
|
|
int rc;
|
|
if (g_chip.is_open)
|
|
return -EBUSY;
|
|
rc = tpm_vendor_init(dev_addr);
|
|
if (rc < 0)
|
|
g_chip.is_open = 0;
|
|
return rc;
|
|
}
|
|
|
|
static void tpm_close(void)
|
|
{
|
|
if (g_chip.is_open) {
|
|
tpm_vendor_cleanup(&g_chip);
|
|
g_chip.is_open = 0;
|
|
}
|
|
}
|
|
|
|
static int tpm_select(void)
|
|
{
|
|
int ret;
|
|
|
|
tpm.old_bus = i2c_get_bus_num();
|
|
if (tpm.old_bus != tpm.i2c_bus) {
|
|
ret = i2c_set_bus_num(tpm.i2c_bus);
|
|
if (ret) {
|
|
debug("%s: Fail to set i2c bus %d\n", __func__,
|
|
tpm.i2c_bus);
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int tpm_deselect(void)
|
|
{
|
|
int ret;
|
|
|
|
if (tpm.old_bus != i2c_get_bus_num()) {
|
|
ret = i2c_set_bus_num(tpm.old_bus);
|
|
if (ret) {
|
|
debug("%s: Fail to restore i2c bus %d\n",
|
|
__func__, tpm.old_bus);
|
|
return -1;
|
|
}
|
|
}
|
|
tpm.old_bus = -1;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* Decode TPM configuration.
|
|
*
|
|
* @param dev Returns a configuration of TPM device
|
|
* @return 0 if ok, -1 on error
|
|
*/
|
|
static int tpm_decode_config(struct tpm *dev)
|
|
{
|
|
#ifdef CONFIG_OF_CONTROL
|
|
const void *blob = gd->fdt_blob;
|
|
int node, parent;
|
|
int i2c_bus;
|
|
|
|
node = fdtdec_next_compatible(blob, 0, COMPAT_INFINEON_SLB9635_TPM);
|
|
if (node < 0) {
|
|
node = fdtdec_next_compatible(blob, 0,
|
|
COMPAT_INFINEON_SLB9645_TPM);
|
|
}
|
|
if (node < 0) {
|
|
debug("%s: Node not found\n", __func__);
|
|
return -1;
|
|
}
|
|
parent = fdt_parent_offset(blob, node);
|
|
if (parent < 0) {
|
|
debug("%s: Cannot find node parent\n", __func__);
|
|
return -1;
|
|
}
|
|
i2c_bus = i2c_get_bus_num_fdt(parent);
|
|
if (i2c_bus < 0)
|
|
return -1;
|
|
dev->i2c_bus = i2c_bus;
|
|
dev->slave_addr = fdtdec_get_addr(blob, node, "reg");
|
|
#else
|
|
dev->i2c_bus = CONFIG_TPM_TIS_I2C_BUS_NUMBER;
|
|
dev->slave_addr = CONFIG_TPM_TIS_I2C_SLAVE_ADDRESS;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *entry)
|
|
{
|
|
struct tpm_chip *chip;
|
|
|
|
/* Driver specific per-device data */
|
|
chip = &g_chip;
|
|
memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
|
|
chip->is_open = 1;
|
|
|
|
return chip;
|
|
}
|
|
|
|
int tis_init(void)
|
|
{
|
|
if (tpm.inited)
|
|
return 0;
|
|
|
|
if (tpm_decode_config(&tpm))
|
|
return -1;
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
/*
|
|
* Probe TPM twice; the first probing might fail because TPM is asleep,
|
|
* and the probing can wake up TPM.
|
|
*/
|
|
if (i2c_probe(tpm.slave_addr) && i2c_probe(tpm.slave_addr)) {
|
|
debug("%s: fail to probe i2c addr 0x%x\n", __func__,
|
|
tpm.slave_addr);
|
|
return -1;
|
|
}
|
|
|
|
tpm_deselect();
|
|
|
|
tpm.inited = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tis_open(void)
|
|
{
|
|
int rc;
|
|
|
|
if (!tpm.inited)
|
|
return -1;
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
rc = tpm_open(tpm.slave_addr);
|
|
|
|
tpm_deselect();
|
|
|
|
return rc;
|
|
}
|
|
|
|
int tis_close(void)
|
|
{
|
|
if (!tpm.inited)
|
|
return -1;
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
tpm_close();
|
|
|
|
tpm_deselect();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
|
|
uint8_t *recvbuf, size_t *rbuf_len)
|
|
{
|
|
int len;
|
|
uint8_t buf[4096];
|
|
|
|
if (!tpm.inited)
|
|
return -1;
|
|
|
|
if (sizeof(buf) < sbuf_size)
|
|
return -1;
|
|
|
|
memcpy(buf, sendbuf, sbuf_size);
|
|
|
|
if (tpm_select())
|
|
return -1;
|
|
|
|
len = tpm_transmit(buf, sbuf_size);
|
|
|
|
tpm_deselect();
|
|
|
|
if (len < 10) {
|
|
*rbuf_len = 0;
|
|
return -1;
|
|
}
|
|
|
|
memcpy(recvbuf, buf, len);
|
|
*rbuf_len = len;
|
|
|
|
return 0;
|
|
}
|