Add Atmel I2C tpm

Add support for Atmel TPM devices with two wire interface. Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc> Signed-off-by: Reinhard Pfau <reinhard.pfau@gdsys.cc> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Andy Fleming <afleming@freescale.com>

Add Atmel I2C tpm
Add support for Atmel TPM devices with two wire interface. Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc> Signed-off-by: Reinhard Pfau <reinhard.pfau@gdsys.cc> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Andy Fleming <afleming@freescale.com>
Dirk Eibach · Andy Fleming
1 parent b778c1b5de
Showing 3 changed files with 125 additions and 0 deletions Side-by-side Diff
README
drivers/tpm/Makefile
drivers/tpm/tpm_atmel_twi.c
@@ -1238,6 +1238,9 @@
 			CONFIG_TPM_TIS_I2C_BURST_LIMITATION
 			Define the burst count bytes upper limit
  
+		CONFIG_TPM_ATMEL_TWI
+		Support for Atmel TWI TPM device. Requires I2C support.
+
 		CONFIG_TPM_TIS_LPC
 		Support for generic parallel port TPM devices. Only one device
 		per system is supported at this time.
@@ -26,6 +26,7 @@
 $(shell mkdir -p $(obj)slb9635_i2c)
  
 # TODO: Merge tpm_tis_lpc.c with tpm.c
+COBJS-$(CONFIG_TPM_ATMEL_TWI) += tpm_atmel_twi.o
 COBJS-$(CONFIG_TPM_TIS_I2C) += tpm.o
 COBJS-$(CONFIG_TPM_TIS_I2C) += tpm_tis_i2c.o
 COBJS-$(CONFIG_TPM_TIS_LPC) += tpm_tis_lpc.o
+/*
+ * 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 <common.h>
+#include <tpm.h>
+#include <i2c.h>
+#include <asm/unaligned.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()
+ *
+ * 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)
+{
+	return 0;
+}
+
+/*
+ * tis_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)
+{
+	return 0;
+}
+
+/*
+ * tis_sendrecv()
+ *
+ * Send the requested data to the TPM and then try to get its response
+ *
+ * @sendbuf - buffer of the data to send
+ * @send_size size of the data to send
+ * @recvbuf - memory to save the response to
+ * @recv_len - pointer to the size of the response buffer
+ *
+ * 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)
+{
+	int res;
+	unsigned long start;
+
+#ifdef DEBUG
+	memset(recvbuf, 0xcc, *recv_len);
+	printf("send to TPM (%d bytes, recv_len=%d):\n", send_size, *recv_len);
+	print_buffer(0, (void *)sendbuf, 1, send_size, 0);
+#endif
+
+	res = i2c_write(0x29, 0, 0, (uchar *)sendbuf, send_size);
+	if (res) {
+		printf("i2c_write returned %d\n", res);
+		return -1;
+	}
+
+	start = get_timer(0);
+	while ((res = i2c_read(0x29, 0, 0, recvbuf, 10))) {
+		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)
+			res = i2c_read(0x29, 0, 0, recvbuf, *recv_len);
+	}
+	if (res) {
+		printf("i2c_read returned %d (rlen=%d)\n", res, *recv_len);
+#ifdef DEBUG
+		print_buffer(0, recvbuf, 1, *recv_len, 0);
+#endif
+	}
+
+#ifdef DEBUG
+	if (!res) {
+		printf("read from TPM (%d bytes):\n", *recv_len);
+		print_buffer(0, recvbuf, 1, *recv_len, 0);
+	}
+#endif
+
+	return res;
+}
...	...	@@ -1238,6 +1238,9 @@
1238	1238	CONFIG_TPM_TIS_I2C_BURST_LIMITATION
1239	1239	Define the burst count bytes upper limit
1240	1240
	1241	+ CONFIG_TPM_ATMEL_TWI
	1242	+ Support for Atmel TWI TPM device. Requires I2C support.
	1243	+
1241	1244	CONFIG_TPM_TIS_LPC
1242	1245	Support for generic parallel port TPM devices. Only one device
1243	1246	per system is supported at this time.
...	...	@@ -26,6 +26,7 @@
26	26	$(shell mkdir -p $(obj)slb9635_i2c)
27	27
28	28	# TODO: Merge tpm_tis_lpc.c with tpm.c
	29	+COBJS-$(CONFIG_TPM_ATMEL_TWI) += tpm_atmel_twi.o
29	30	COBJS-$(CONFIG_TPM_TIS_I2C) += tpm.o
30	31	COBJS-$(CONFIG_TPM_TIS_I2C) += tpm_tis_i2c.o
31	32	COBJS-$(CONFIG_TPM_TIS_LPC) += tpm_tis_lpc.o
	1	+/*
	2	+ * This program is free software; you can redistribute it and/or
	3	+ * modify it under the terms of the GNU General Public License as
	4	+ * published by the Free Software Foundation; either version 2 of
	5	+ * the License, or (at your option) any later version.
	6	+ *
	7	+ * This program is distributed in the hope that it will be useful,
	8	+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
	9	+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	10	+ * GNU General Public License for more details.
	11	+ *
	12	+ * You should have received a copy of the GNU General Public License
	13	+ * along with this program; if not, write to the Free Software
	14	+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
	15	+ * MA 02111-1307 USA
	16	+ */
	17	+
	18	+#include <common.h>
	19	+#include <tpm.h>
	20	+#include <i2c.h>
	21	+#include <asm/unaligned.h>
	22	+
	23	+#define ATMEL_TPM_TIMEOUT_MS 5000 /* sufficient for anything but
	24	+ generating/exporting keys */
	25	+
	26	+/*
	27	+ * tis_init()
	28	+ *
	29	+ * Initialize the TPM device. Returns 0 on success or -1 on
	30	+ * failure (in case device probing did not succeed).
	31	+ */
	32	+int tis_init(void)
	33	+{
	34	+ return 0;
	35	+}
	36	+
	37	+/*
	38	+ * tis_open()
	39	+ *
	40	+ * Requests access to locality 0 for the caller. After all commands have been
	41	+ * completed the caller is supposed to call tis_close().
	42	+ *
	43	+ * Returns 0 on success, -1 on failure.
	44	+ */
	45	+int tis_open(void)
	46	+{
	47	+ return 0;
	48	+}
	49	+
	50	+/*
	51	+ * tis_close()
	52	+ *
	53	+ * terminate the currect session with the TPM by releasing the locked
	54	+ * locality. Returns 0 on success of -1 on failure (in case lock
	55	+ * removal did not succeed).
	56	+ */
	57	+int tis_close(void)
	58	+{
	59	+ return 0;
	60	+}
	61	+
	62	+/*
	63	+ * tis_sendrecv()
	64	+ *
	65	+ * Send the requested data to the TPM and then try to get its response
	66	+ *
	67	+ * @sendbuf - buffer of the data to send
	68	+ * @send_size size of the data to send
	69	+ * @recvbuf - memory to save the response to
	70	+ * @recv_len - pointer to the size of the response buffer
	71	+ *
	72	+ * Returns 0 on success (and places the number of response bytes at recv_len)
	73	+ * or -1 on failure.
	74	+ */
	75	+int tis_sendrecv(const uint8_t sendbuf, size_t send_size, uint8_t recvbuf,
	76	+ size_t *recv_len)
	77	+{
	78	+ int res;
	79	+ unsigned long start;
	80	+
	81	+#ifdef DEBUG
	82	+ memset(recvbuf, 0xcc, *recv_len);
	83	+ printf("send to TPM (%d bytes, recv_len=%d):\n", send_size, *recv_len);
	84	+ print_buffer(0, (void *)sendbuf, 1, send_size, 0);
	85	+#endif
	86	+
	87	+ res = i2c_write(0x29, 0, 0, (uchar *)sendbuf, send_size);
	88	+ if (res) {
	89	+ printf("i2c_write returned %d\n", res);
	90	+ return -1;
	91	+ }
	92	+
	93	+ start = get_timer(0);
	94	+ while ((res = i2c_read(0x29, 0, 0, recvbuf, 10))) {
	95	+ if (get_timer(start) > ATMEL_TPM_TIMEOUT_MS) {
	96	+ puts("tpm timed out\n");
	97	+ return -1;
	98	+ }
	99	+ udelay(100);
	100	+ }
	101	+ if (!res) {
	102	+ *recv_len = get_unaligned_be32(recvbuf + 2);
	103	+ if (*recv_len > 10)
	104	+ res = i2c_read(0x29, 0, 0, recvbuf, *recv_len);
	105	+ }
	106	+ if (res) {
	107	+ printf("i2c_read returned %d (rlen=%d)\n", res, *recv_len);
	108	+#ifdef DEBUG
	109	+ print_buffer(0, recvbuf, 1, *recv_len, 0);
	110	+#endif
	111	+ }
	112	+
	113	+#ifdef DEBUG
	114	+ if (!res) {
	115	+ printf("read from TPM (%d bytes):\n", *recv_len);
	116	+ print_buffer(0, recvbuf, 1, *recv_len, 0);
	117	+ }
	118	+#endif
	119	+
	120	+ return res;
	121	+}