1 files changed, 84 insertions, 0 deletions
diff --git a/src/drivers/spi/tpm/tis.c b/src/drivers/spi/tpm/tis.c
new file mode 100644
index 0000000000..9facb5208b
--- /dev/null
+++ b/src/drivers/spi/tpm/tis.c
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2016 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include <arch/early_variables.h>
+#include <console/console.h>
+#include <string.h>
+#include <tpm.h>
+
+#include "tpm.h"
+
+static unsigned tpm_is_open CAR_GLOBAL;
+
+static const struct {
+	uint16_t vid;
+	uint16_t did;
+	const char *device_name;
+} dev_map[] = {
+	{ 0x15d1, 0x001b, "SLB9670" },
+	{ 0x1ae0, 0x0028, "CR50" },
+};
+
+static const char *tis_get_dev_name(struct tpm2_info *info)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(dev_map); i++)
+		if ((dev_map[i].vid == info->vendor_id) &&
+		    (dev_map[i].did == info->device_id))
+			return dev_map[i].device_name;
+	return "Unknown";
+}
+
+int tis_open(void)
+{
+	if (car_get_var(tpm_is_open)) {
+		printk(BIOS_ERR, "tis_open() called twice.\n");
+		return -1;
+	}
+	return 0;
+}
+
+int tis_close(void)
+{
+	if (car_get_var(tpm_is_open)) {
+
+		/*
+		 * Do we need to do something here, like waiting for a
+		 * transaction to stop?
+		 */
+		car_set_var(tpm_is_open, 0);
+	}
+
+	return 0;
+}
+
+int tis_init(void)
+{
+	struct tpm2_info info;
+
+	if (tpm2_init(spi_setup_slave(CONFIG_DRIVER_TPM_SPI_BUS,
+				      CONFIG_DRIVER_TPM_SPI_CHIP))) {
+		printk(BIOS_ERR, "Failed to initialize TPM SPI intierface\n");
+		return -1;
+	}
+
+	tpm2_get_info(&info);
+
+	printk(BIOS_INFO, "Initialized TPM device %s revision %d\n",
+	       tis_get_dev_name(&info), info.revision);
+
+	return 0;
+}
+
+
+int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
+		 uint8_t *recvbuf, size_t *rbuf_len)
+{
+	int len = tpm2_process_command(sendbuf, sbuf_size, recvbuf, *rbuf_len);
+	*rbuf_len = len;
+	return 0;
+}