+// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2013 Guntermann & Drunck, GmbH
*
- * Written by Dirk Eibach <eibach@gdsys.de>
- *
- * SPDX-License-Identifier: GPL-2.0+
+ * Written by Dirk Eibach <dirk.eibach@gdsys.cc>
*/
#include <common.h>
-#include <tpm.h>
+#include <dm.h>
+#include <tpm-v1.h>
#include <i2c.h>
#include <asm/unaligned.h>
+#include "tpm_internal.h"
+
#define ATMEL_TPM_TIMEOUT_MS 5000 /* sufficient for anything but
generating/exporting keys */
/*
- * tis_init()
- *
- * Initialize the TPM device. Returns 0 on success or -1 on
- * failure (in case device probing did not succeed).
- */
-int tis_init(void)
-{
- return 0;
-}
-
-/*
- * tis_open()
+ * tpm_atmel_twi_open()
*
* Requests access to locality 0 for the caller. After all commands have been
* completed the caller is supposed to call tis_close().
*
* Returns 0 on success, -1 on failure.
*/
-int tis_open(void)
+static int tpm_atmel_twi_open(struct udevice *dev)
{
return 0;
}
/*
- * tis_close()
+ * tpm_atmel_twi_close()
*
* terminate the currect session with the TPM by releasing the locked
* locality. Returns 0 on success of -1 on failure (in case lock
* removal did not succeed).
*/
-int tis_close(void)
+static int tpm_atmel_twi_close(struct udevice *dev)
+{
+ return 0;
+}
+
+/*
+ * tpm_atmel_twi_get_desc()
+ *
+ * @dev: Device to check
+ * @buf: Buffer to put the string
+ * @size: Maximum size of buffer
+ * @return length of string, or -ENOSPC it no space
+ */
+static int tpm_atmel_twi_get_desc(struct udevice *dev, char *buf, int size)
{
return 0;
}
/*
- * tis_sendrecv()
+ * tpm_atmel_twi_xfer()
*
* Send the requested data to the TPM and then try to get its response
*
* Returns 0 on success (and places the number of response bytes at recv_len)
* or -1 on failure.
*/
-int tis_sendrecv(const uint8_t *sendbuf, size_t send_size, uint8_t *recvbuf,
- size_t *recv_len)
+static int tpm_atmel_twi_xfer(struct udevice *dev,
+ const uint8_t *sendbuf, size_t send_size,
+ uint8_t *recvbuf, size_t *recv_len)
{
int res;
unsigned long start;
print_buffer(0, (void *)sendbuf, 1, send_size, 0);
#endif
+#ifndef CONFIG_DM_I2C
res = i2c_write(0x29, 0, 0, (uchar *)sendbuf, send_size);
+#else
+ res = dm_i2c_write(dev, 0, sendbuf, send_size);
+#endif
if (res) {
printf("i2c_write returned %d\n", res);
return -1;
}
start = get_timer(0);
- while ((res = i2c_read(0x29, 0, 0, recvbuf, 10))) {
+#ifndef CONFIG_DM_I2C
+ while ((res = i2c_read(0x29, 0, 0, recvbuf, 10)))
+#else
+ while ((res = dm_i2c_read(dev, 0, recvbuf, 10)))
+#endif
+ {
+ /* TODO Use TIS_TIMEOUT from tpm_tis_infineon.h */
if (get_timer(start) > ATMEL_TPM_TIMEOUT_MS) {
puts("tpm timed out\n");
return -1;
udelay(100);
}
if (!res) {
- *recv_len = get_unaligned_be32(recvbuf + 2);
- if (*recv_len > 10)
+ unsigned int hdr_recv_len;
+ hdr_recv_len = get_unaligned_be32(recvbuf + 2);
+ if (hdr_recv_len < 10) {
+ puts("tpm response header too small\n");
+ return -1;
+ } else if (hdr_recv_len > *recv_len) {
+ puts("tpm response length is bigger than receive buffer\n");
+ return -1;
+ } else {
+ *recv_len = hdr_recv_len;
+#ifndef CONFIG_DM_I2C
res = i2c_read(0x29, 0, 0, recvbuf, *recv_len);
+#else
+ res = dm_i2c_read(dev, 0, recvbuf, *recv_len);
+#endif
+
+ }
}
if (res) {
printf("i2c_read returned %d (rlen=%d)\n", res, *recv_len);
return res;
}
+
+static int tpm_atmel_twi_probe(struct udevice *dev)
+{
+ return 0;
+}
+
+static const struct udevice_id tpm_atmel_twi_ids[] = {
+ { .compatible = "atmel,at97sc3204t"},
+ { }
+};
+
+static const struct tpm_ops tpm_atmel_twi_ops = {
+ .open = tpm_atmel_twi_open,
+ .close = tpm_atmel_twi_close,
+ .xfer = tpm_atmel_twi_xfer,
+ .get_desc = tpm_atmel_twi_get_desc,
+};
+
+U_BOOT_DRIVER(tpm_atmel_twi) = {
+ .name = "tpm_atmel_twi",
+ .id = UCLASS_TPM,
+ .of_match = tpm_atmel_twi_ids,
+ .ops = &tpm_atmel_twi_ops,
+ .probe = tpm_atmel_twi_probe,
+};