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Diffstat (limited to 'src/drivers/i2c/tpm/tis.c')
-rw-r--r--src/drivers/i2c/tpm/tis.c182
1 files changed, 182 insertions, 0 deletions
diff --git a/src/drivers/i2c/tpm/tis.c b/src/drivers/i2c/tpm/tis.c
new file mode 100644
index 0000000000..3a5f519ee0
--- /dev/null
+++ b/src/drivers/i2c/tpm/tis.c
@@ -0,0 +1,182 @@
+/*
+ * Copyright (C) 2011 Infineon Technologies
+ * Copyright 2013 Google Inc.
+ *
+ * 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; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * 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 <stdint.h>
+#include <string.h>
+#include <assert.h>
+#include <delay.h>
+#include <arch/byteorder.h>
+#include <device/i2c.h>
+#include <tpm.h>
+#include "tpm.h"
+
+#include <console/console.h>
+
+/* global structure for tpm chip data */
+struct tpm_chip g_chip;
+
+#define TPM_CMD_COUNT_BYTE 2
+#define TPM_CMD_ORDINAL_BYTE 6
+
+int tis_open(void)
+{
+ int rc;
+
+ if (g_chip.is_open) {
+ printk(BIOS_DEBUG, "tis_open() called twice.\n");
+ return -1;
+ }
+
+ rc = tpm_vendor_init(CONFIG_DRIVER_TPM_I2C_BUS,
+ CONFIG_DRIVER_TPM_I2C_ADDR);
+
+ if (rc < 0)
+ g_chip.is_open = 0;
+
+ if (rc) {
+ return -1;
+ }
+
+ return 0;
+}
+
+int tis_close(void)
+{
+ if (g_chip.is_open) {
+ tpm_vendor_cleanup(&g_chip);
+ g_chip.is_open = 0;
+ }
+
+ return 0;
+}
+
+int tis_init(void)
+{
+ int bus = CONFIG_DRIVER_TPM_I2C_BUS;
+ int chip = CONFIG_DRIVER_TPM_I2C_ADDR;
+
+ /*
+ * Probe TPM twice; the first probing might fail because TPM is asleep,
+ * and the probing can wake up TPM.
+ */
+ uint8_t tmp;
+
+ if (i2c_read(bus, chip, 0, 0, &tmp, sizeof(tmp)) &&
+ i2c_read(bus, chip, 0, 0, &tmp, sizeof(tmp)))
+ return -1;
+
+ return 0;
+}
+
+static ssize_t tpm_transmit(const uint8_t *buf, size_t bufsiz)
+{
+ int rc;
+ uint32_t count, ordinal;
+
+ struct tpm_chip *chip = &g_chip;
+
+ memcpy(&count, buf + TPM_CMD_COUNT_BYTE, sizeof(count));
+ count = be32_to_cpu(count);
+ memcpy(&ordinal, buf + TPM_CMD_ORDINAL_BYTE, sizeof(ordinal));
+ ordinal = be32_to_cpu(ordinal);
+
+ if (count == 0) {
+ printk(BIOS_DEBUG, "tpm_transmit: no data\n");
+ return -1;
+ }
+ if (count > bufsiz) {
+ printk(BIOS_DEBUG, "tpm_transmit: invalid count value %x %zx\n",
+ count, bufsiz);
+ return -1;
+ }
+
+ ASSERT(chip->vendor.send);
+ rc = chip->vendor.send(chip, (uint8_t *) buf, count);
+ if (rc < 0) {
+ printk(BIOS_DEBUG, "tpm_transmit: tpm_send error\n");
+ goto out;
+ }
+
+ if (chip->vendor.irq)
+ goto out_recv;
+
+ int timeout = 2 * 60 * 1000; /* two minutes timeout */
+ while (timeout) {
+ ASSERT(chip->vendor.status);
+ uint8_t status = chip->vendor.status(chip);
+ if ((status & chip->vendor.req_complete_mask) ==
+ chip->vendor.req_complete_val) {
+ goto out_recv;
+ }
+
+ if ((status == chip->vendor.req_canceled)) {
+ printk(BIOS_DEBUG, "tpm_transmit: Operation Canceled\n");
+ rc = -1;
+ goto out;
+ }
+ mdelay(TPM_TIMEOUT);
+ timeout--;
+ }
+
+ ASSERT(chip->vendor.cancel);
+ chip->vendor.cancel(chip);
+ printk(BIOS_DEBUG, "tpm_transmit: Operation Timed out\n");
+ rc = -1; //ETIME;
+ goto out;
+
+out_recv:
+
+ rc = chip->vendor.recv(chip, (uint8_t *) buf, TPM_BUFSIZE);
+ if (rc < 0)
+ printk(BIOS_DEBUG, "tpm_transmit: tpm_recv: error %zd\n", rc);
+out:
+ return rc;
+}
+
+int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
+ uint8_t *recvbuf, size_t *rbuf_len)
+{
+ uint8_t buf[TPM_BUFSIZE];
+
+ if (sizeof(buf) < sbuf_size)
+ return -1;
+
+ memcpy(buf, sendbuf, sbuf_size);
+
+ int len = tpm_transmit(buf, sbuf_size);
+
+ if (len < 10) {
+ *rbuf_len = 0;
+ return -1;
+ }
+
+ if (len > *rbuf_len) {
+ *rbuf_len = len;
+ return -1;
+ }
+
+ memcpy(recvbuf, buf, len);
+ *rbuf_len = len;
+
+ return 0;
+}