1 files changed, 132 insertions, 0 deletions
diff --git a/src/drivers/i2c/tpm/tis_atmel.c b/src/drivers/i2c/tpm/tis_atmel.c
new file mode 100644
index 0000000000..7d8b7a17b8
--- /dev/null
+++ b/src/drivers/i2c/tpm/tis_atmel.c
@@ -0,0 +1,132 @@
+/*
+ * Copyright (C) 2017 Intel 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; 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.
+ */
+
+#include <arch/early_variables.h>
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+#include <commonlib/endian.h>
+#include <console/console.h>
+#include <delay.h>
+#include <device/i2c.h>
+#include <endian.h>
+#include <lib.h>
+#include <tpm.h>
+#include <timer.h>
+
+#define RECV_TIMEOUT            (1 * 1000)  /* 1 second */
+#define XMIT_TIMEOUT            (1 * 1000)  /* 1 second */
+#define SLEEP_DURATION          1000        /* microseconds */
+
+struct tpm_output_header {
+	uint16_t tag;
+	uint32_t length;
+	uint32_t return_code;
+} __attribute__ ((packed));
+
+int tis_open(void)
+{
+	return 0;
+}
+
+int tis_close(void)
+{
+	return 0;
+}
+
+int tis_init(void)
+{
+	return 0;
+}
+
+int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
+		uint8_t *recvbuf, size_t *rbuf_len)
+{
+	size_t hdr_bytes;
+	struct tpm_output_header *header;
+	size_t max_recv_bytes;
+	size_t recv_bytes;
+	int status;
+	struct stopwatch sw;
+
+	ASSERT(sbuf_size >= 10);
+	if (IS_ENABLED(CONFIG_DRIVER_TPM_DISPLAY_TIS_BYTES)) {
+		/* Display the TPM command */
+		if (sbuf_size >= 10)
+			printk(BIOS_DEBUG, "TPM Command: 0x%08x\n",
+				read_at_be32(sendbuf, sizeof(uint16_t)
+				+ sizeof(uint32_t)));
+		hexdump(sendbuf, sbuf_size);
+	}
+
+	/* Send the command to the TPM */
+	stopwatch_init_msecs_expire(&sw, XMIT_TIMEOUT);
+	while (1) {
+		status = i2c_write_raw(CONFIG_DRIVER_TPM_I2C_BUS,
+			CONFIG_DRIVER_TPM_I2C_ADDR, (uint8_t *)sendbuf,
+			sbuf_size);
+		if ((status < 0) && (!stopwatch_expired(&sw)))
+			continue;
+		if (status < 0)
+			return status;
+		break;
+	}
+
+	/* Read the TPM response header */
+	max_recv_bytes = *rbuf_len;
+	ASSERT(max_recv_bytes >= sizeof(*header));
+	hdr_bytes = sizeof(*header);
+	header = (struct tpm_output_header *)recvbuf;
+	stopwatch_init_msecs_expire(&sw, RECV_TIMEOUT);
+	do {
+		status = i2c_read_raw(CONFIG_DRIVER_TPM_I2C_BUS,
+			CONFIG_DRIVER_TPM_I2C_ADDR, recvbuf, hdr_bytes);
+		if (status > 0)
+			break;
+		udelay(SLEEP_DURATION);
+	} while (!stopwatch_expired(&sw));
+	if (status != sizeof(*header))
+		return -1;
+
+	/* Determine the number of bytes remaining */
+	recv_bytes = min(be32_to_cpu(*(uint32_t *)&header->length),
+		max_recv_bytes);
+
+	/* Determine if there is additional response data */
+	if (recv_bytes > hdr_bytes) {
+		/* Display the TPM response */
+		if (IS_ENABLED(CONFIG_DRIVER_TPM_DISPLAY_TIS_BYTES))
+			hexdump(recvbuf, hdr_bytes);
+
+		/* Read the full TPM response */
+		status = i2c_read_raw(CONFIG_DRIVER_TPM_I2C_BUS,
+			CONFIG_DRIVER_TPM_I2C_ADDR, recvbuf, recv_bytes);
+		if (status < 0)
+			return status;
+	}
+
+	/* Return the number of bytes received */
+	*rbuf_len = status;
+
+	/* Display the TPM response */
+	if (IS_ENABLED(CONFIG_DRIVER_TPM_DISPLAY_TIS_BYTES)) {
+		printk(BIOS_DEBUG, "TPM Response: 0x%08x\n",
+			read_at_be32(recvbuf, sizeof(uint16_t)
+				+ sizeof(uint32_t)));
+		hexdump(recvbuf, *rbuf_len);
+	}
+
+	/* Successful transfer */
+	return 0;
+}