summaryrefslogtreecommitdiff
path: root/src/drivers/i2c
diff options
context:
space:
mode:
Diffstat (limited to 'src/drivers/i2c')
-rw-r--r--src/drivers/i2c/Kconfig1
-rw-r--r--src/drivers/i2c/Makefile.inc1
-rw-r--r--src/drivers/i2c/tpm/Kconfig9
-rw-r--r--src/drivers/i2c/tpm/Makefile.inc2
-rw-r--r--src/drivers/i2c/tpm/tis.h74
-rw-r--r--src/drivers/i2c/tpm/tis_i2c.c103
-rw-r--r--src/drivers/i2c/tpm/tpm.c146
-rw-r--r--src/drivers/i2c/tpm/tpm.h156
-rw-r--r--src/drivers/i2c/tpm/tpm_tis_i2c.c578
9 files changed, 1070 insertions, 0 deletions
diff --git a/src/drivers/i2c/Kconfig b/src/drivers/i2c/Kconfig
index a6f59f4492..5c55c44d07 100644
--- a/src/drivers/i2c/Kconfig
+++ b/src/drivers/i2c/Kconfig
@@ -5,5 +5,6 @@ source src/drivers/i2c/i2cmux/Kconfig
source src/drivers/i2c/i2cmux2/Kconfig
source src/drivers/i2c/lm63/Kconfig
source src/drivers/i2c/rtd2132/Kconfig
+source src/drivers/i2c/tpm/Kconfig
source src/drivers/i2c/w83795/Kconfig
source src/drivers/i2c/w83793/Kconfig
diff --git a/src/drivers/i2c/Makefile.inc b/src/drivers/i2c/Makefile.inc
index 8c61b6a96d..81ca409209 100644
--- a/src/drivers/i2c/Makefile.inc
+++ b/src/drivers/i2c/Makefile.inc
@@ -5,6 +5,7 @@ subdirs-y += i2cmux
subdirs-y += i2cmux2
subdirs-y += lm63
subdirs-y += rtd2132
+subdirs-y += tpm
subdirs-y += w83795
subdirs-y += w83793
subdirs-y += at24rf08c
diff --git a/src/drivers/i2c/tpm/Kconfig b/src/drivers/i2c/tpm/Kconfig
new file mode 100644
index 0000000000..2456204960
--- /dev/null
+++ b/src/drivers/i2c/tpm/Kconfig
@@ -0,0 +1,9 @@
+config I2C_TPM
+ bool "I2C TPM"
+ depends on !PC80 # for now
+
+config DRIVER_TPM_I2C_ADDR
+ hex "I2C TPM chip address"
+ default 2 # FIXME, workaround for Kconfig BS
+ depends on I2C_TPM
+
diff --git a/src/drivers/i2c/tpm/Makefile.inc b/src/drivers/i2c/tpm/Makefile.inc
new file mode 100644
index 0000000000..74d9b7e5aa
--- /dev/null
+++ b/src/drivers/i2c/tpm/Makefile.inc
@@ -0,0 +1,2 @@
+ramstage-$(CONFIG_I2C_TPM) += tis_i2c.c tpm.c tpm_tis_i2c.c
+romstage-$(CONFIG_I2C_TPM) += tis_i2c.c tpm.c tpm_tis_i2c.c
diff --git a/src/drivers/i2c/tpm/tis.h b/src/drivers/i2c/tpm/tis.h
new file mode 100644
index 0000000000..348f9a8019
--- /dev/null
+++ b/src/drivers/i2c/tpm/tis.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2011 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
+ */
+
+#ifndef __DRIVERS_TPM_TPM_H__
+#define __DRIVERS_TPM_TPM_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+void tis_set_i2c_bus(unsigned _bus);
+
+/*
+ * 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);
+
+/*
+ * 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);
+
+/*
+ * 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);
+
+/*
+ * 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);
+
+#endif /* __DRIVERS_TPM_TPM_H__ */
diff --git a/src/drivers/i2c/tpm/tis_i2c.c b/src/drivers/i2c/tpm/tis_i2c.c
new file mode 100644
index 0000000000..59971a2631
--- /dev/null
+++ b/src/drivers/i2c/tpm/tis_i2c.c
@@ -0,0 +1,103 @@
+/*
+ * 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 <device/i2c.h>
+#include "tis.h"
+#include "tpm.h"
+
+static unsigned bus = 0;
+
+static int opened;
+
+void tis_set_i2c_bus(unsigned _bus)
+{
+ bus = _bus;
+}
+
+int tis_open(void)
+{
+ opened = 1;
+ if (tpm_open(bus, CONFIG_DRIVER_TPM_I2C_ADDR)) {
+ opened = 0;
+ return -1;
+ }
+ return 0;
+}
+
+int tis_close(void)
+{
+ opened = 0;
+ tpm_close();
+ return 0;
+}
+
+int tis_init(void)
+{
+ 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 (!bus)
+ return -1;
+
+ if (i2c_read(bus, chip, 0, 0, &tmp, sizeof(tmp)) &&
+ i2c_read(bus, chip, 0, 0, &tmp, sizeof(tmp)))
+ return -1;
+
+ return 0;
+}
+
+int tis_sendrecv(const uint8_t *sendbuf, size_t sbuf_size,
+ uint8_t *recvbuf, size_t *rbuf_len)
+{
+ uint8_t buf[TPM_BUFSIZE];
+
+ if (!opened && tis_open())
+ return -1;
+
+ 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;
+}
diff --git a/src/drivers/i2c/tpm/tpm.c b/src/drivers/i2c/tpm/tpm.c
new file mode 100644
index 0000000000..d31cc79878
--- /dev/null
+++ b/src/drivers/i2c/tpm/tpm.c
@@ -0,0 +1,146 @@
+/*
+ * Copyright (C) 2011 Infineon Technologies
+ *
+ * Authors:
+ * Peter Huewe <huewe.external@infineon.com>
+ *
+ * Description:
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * It is based on the Linux kernel driver tpm.c from Leendert van
+ * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
+ *
+ * Version: 2.1.1
+ *
+ * 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, version 2 of the
+ * License.
+ *
+ * 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 <console/console.h>
+#include <arch/byteorder.h>
+#include "tis.h"
+#include "tpm.h"
+
+/* global structure for tpm chip data */
+struct tpm_chip g_chip;
+
+#define TPM_CMD_COUNT_BYTE 2
+#define TPM_CMD_ORDINAL_BYTE 6
+
+ssize_t tpm_transmit(const uint8_t *buf, size_t bufsiz)
+{
+ ssize_t 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; //ENODATA;
+ }
+ if (count > bufsiz) {
+ printk(BIOS_DEBUG, "tpm_transmit: invalid count value %x %zx\n",
+ count, bufsiz);
+ return -1; //E2BIG;
+ }
+
+ ASSERT(chip->vendor.send);
+ rc = chip->vendor.send(chip, (uint8_t *) buf, count);
+ if (rc < 0) {
+ printk(BIOS_DEBUG, "tpm_transmit: tpm_send: error %zd\n", rc);
+ 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;
+}
+
+#define TPM_ERROR_SIZE 10
+
+struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *entry)
+{
+ struct tpm_chip *chip;
+
+ /* Driver specific per-device data */
+ chip = &g_chip;
+ memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
+ chip->is_open = 1;
+
+ return chip;
+}
+
+int tpm_open(unsigned bus, uint32_t dev_addr)
+{
+ int rc;
+ if (g_chip.is_open)
+ return -1; //EBUSY;
+ rc = tpm_vendor_init(bus, dev_addr);
+ if (rc < 0)
+ g_chip.is_open = 0;
+ return rc;
+}
+
+void tpm_close(void)
+{
+ if (g_chip.is_open) {
+ tpm_vendor_cleanup(&g_chip);
+ g_chip.is_open = 0;
+ }
+}
diff --git a/src/drivers/i2c/tpm/tpm.h b/src/drivers/i2c/tpm/tpm.h
new file mode 100644
index 0000000000..daddc591e4
--- /dev/null
+++ b/src/drivers/i2c/tpm/tpm.h
@@ -0,0 +1,156 @@
+/*
+ * Copyright (C) 2011 Infineon Technologies
+ *
+ * Authors:
+ * Peter Huewe <huewe.external@infineon.com>
+ *
+ * Version: 2.1.1
+ *
+ * Description:
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * It is based on the Linux kernel driver tpm.c from Leendert van
+ * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
+ *
+ *
+ * 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, version 2 of the
+ * License.
+ *
+ * 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
+ */
+
+#ifndef __DRIVERS_TPM_SLB9635_I2C_TPM_H__
+#define __DRIVERS_TPM_SLB9635_I2C_TPM_H__
+
+#include <stdint.h>
+
+enum tpm_timeout {
+ TPM_TIMEOUT = 1, /* msecs */
+};
+
+/* Size of external transmit buffer (used in tpm_transmit)*/
+#define TPM_BUFSIZE 4096
+
+/* Index of fields in TPM command buffer */
+#define TPM_CMD_SIZE_BYTE 2
+#define TPM_CMD_ORDINAL_BYTE 6
+
+/* Index of Count field in TPM response buffer */
+#define TPM_RSP_SIZE_BYTE 2
+#define TPM_RSP_RC_BYTE 6
+
+struct tpm_chip;
+
+struct tpm_vendor_specific {
+ const uint8_t req_complete_mask;
+ const uint8_t req_complete_val;
+ const uint8_t req_canceled;
+ int irq;
+ int (*recv)(struct tpm_chip *, uint8_t *, size_t);
+ int (*send)(struct tpm_chip *, uint8_t *, size_t);
+ void (*cancel)(struct tpm_chip *);
+ uint8_t(*status)(struct tpm_chip *);
+ int locality;
+};
+
+struct tpm_chip {
+ int is_open;
+ struct tpm_vendor_specific vendor;
+};
+
+struct tpm_input_header {
+ uint16_t tag;
+ uint32_t length;
+ uint32_t ordinal;
+} __attribute__ ((packed));
+
+struct tpm_output_header {
+ uint16_t tag;
+ uint32_t length;
+ uint32_t return_code;
+} __attribute__ ((packed));
+
+struct timeout_t {
+ uint32_t a;
+ uint32_t b;
+ uint32_t c;
+ uint32_t d;
+} __attribute__ ((packed));
+
+struct duration_t {
+ uint32_t tpm_short;
+ uint32_t tpm_medium;
+ uint32_t tpm_long;
+} __attribute__ ((packed));
+
+typedef union {
+ struct timeout_t timeout;
+ struct duration_t duration;
+} cap_t;
+
+struct tpm_getcap_params_in {
+ uint32_t cap;
+ uint32_t subcap_size;
+ uint32_t subcap;
+} __attribute__ ((packed));
+
+struct tpm_getcap_params_out {
+ uint32_t cap_size;
+ cap_t cap;
+} __attribute__ ((packed));
+
+typedef union {
+ struct tpm_input_header in;
+ struct tpm_output_header out;
+} tpm_cmd_header;
+
+typedef union {
+ struct tpm_getcap_params_out getcap_out;
+ struct tpm_getcap_params_in getcap_in;
+} tpm_cmd_params;
+
+struct tpm_cmd_t {
+ tpm_cmd_header header;
+ tpm_cmd_params params;
+} __attribute__ ((packed));
+
+
+/* ---------- Interface for TPM vendor ------------ */
+
+struct tpm_chip *tpm_register_hardware(const struct tpm_vendor_specific *);
+
+int tpm_vendor_init(unsigned bus, uint32_t dev_addr);
+
+void tpm_vendor_cleanup(struct tpm_chip *chip);
+
+/* ---------- Interface for TDDL ------------------- */
+
+/*
+ * if dev_addr != 0 - redefines TPM device address
+ * Returns < 0 on error, 0 on success.
+ */
+int tpm_open(unsigned bus, uint32_t dev_addr);
+
+void tpm_close(void);
+
+/*
+ * Transmit bufsiz bytes out of buf to TPM and get results back in buf, too.
+ * Returns < 0 on error, 0 on success.
+ */
+ssize_t tpm_transmit(const unsigned char *buf, size_t bufsiz);
+
+#endif /* __DRIVERS_TPM_SLB9635_I2C_TPM_H__ */
diff --git a/src/drivers/i2c/tpm/tpm_tis_i2c.c b/src/drivers/i2c/tpm/tpm_tis_i2c.c
new file mode 100644
index 0000000000..008fac6e8f
--- /dev/null
+++ b/src/drivers/i2c/tpm/tpm_tis_i2c.c
@@ -0,0 +1,578 @@
+/*
+ * Copyright (C) 2011 Infineon Technologies
+ *
+ * Authors:
+ * Peter Huewe <huewe.external@infineon.com>
+ *
+ * Description:
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * This device driver implements the TPM interface as defined in
+ * the TCG TPM Interface Spec version 1.2, revision 1.0 and the
+ * Infineon I2C Protocol Stack Specification v0.20.
+ *
+ * It is based on the Linux kernel driver tpm.c from Leendert van
+ * Dorn, Dave Safford, Reiner Sailer, and Kyleen Hall.
+ *
+ * Version: 2.1.1
+ *
+ * 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, version 2 of the
+ * License.
+ *
+ * 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 <types.h>
+#include <delay.h>
+#include <console/console.h>
+#include <arch/byteorder.h>
+#include <device/i2c.h>
+#include "tpm.h"
+
+/* max. buffer size supported by our tpm */
+#ifdef TPM_BUFSIZE
+#undef TPM_BUFSIZE
+#endif
+#define TPM_BUFSIZE 1260
+/* Address of the TPM on the I2C bus */
+#define TPM_I2C_ADDR 0x20
+/* max. number of iterations after i2c NAK */
+#define MAX_COUNT 3
+
+#define SLEEP_DURATION 60 /*in usec*/
+
+/* max. number of iterations after i2c NAK for 'long' commands
+ * we need this especially for sending TPM_READY, since the cleanup after the
+ * transtion to the ready state may take some time, but it is unpredictable
+ * how long it will take.
+ */
+#define MAX_COUNT_LONG 50
+
+#define SLEEP_DURATION_LONG 210 /* in usec */
+
+/* expected value for DIDVID register */
+#define TPM_TIS_I2C_DID_VID_9635 0x000b15d1L
+#define TPM_TIS_I2C_DID_VID_9645 0x001a15d1L
+
+enum i2c_chip_type {
+ SLB9635,
+ SLB9645,
+ UNKNOWN,
+};
+
+static const char * const chip_name[] = {
+ [SLB9635] = "slb9635tt",
+ [SLB9645] = "slb9645tt",
+ [UNKNOWN] = "unknown/fallback to slb9635",
+};
+
+/* Structure to store I2C TPM specific stuff */
+struct tpm_inf_dev {
+ unsigned bus;
+ unsigned int addr;
+ uint8_t buf[TPM_BUFSIZE + sizeof(uint8_t)]; // max. buffer size + addr
+ enum i2c_chip_type chip_type;
+};
+
+static struct tpm_inf_dev tpm_dev = {
+ .addr = TPM_I2C_ADDR
+};
+
+/*
+ * iic_tpm_read() - read from TPM register
+ * @addr: register address to read from
+ * @buffer: provided by caller
+ * @len: number of bytes to read
+ *
+ * Read len bytes from TPM register and put them into
+ * buffer (little-endian format, i.e. first byte is put into buffer[0]).
+ *
+ * NOTE: TPM is big-endian for multi-byte values. Multi-byte
+ * values have to be swapped.
+ *
+ * Return -EIO on error, 0 on success.
+ */
+static int iic_tpm_read(uint8_t addr, uint8_t *buffer, size_t len)
+{
+ int rc;
+ int count;
+
+ if (!tpm_dev.bus)
+ return -1;
+ if ((tpm_dev.chip_type == SLB9635) || (tpm_dev.chip_type == UNKNOWN)) {
+ /* slb9635 protocol should work in both cases */
+ for (count = 0; count < MAX_COUNT; count++) {
+ rc = i2c_write(tpm_dev.bus, tpm_dev.addr,
+ 0, 0, &addr, 1);
+ if (rc == 0)
+ break; /* success, break to skip sleep */
+
+ udelay(SLEEP_DURATION);
+ }
+
+ if (rc)
+ return -rc;
+
+ /* After the TPM has successfully received the register address
+ * it needs some time, thus we're sleeping here again, before
+ * retrieving the data
+ */
+ for (count = 0; count < MAX_COUNT; count++) {
+ udelay(SLEEP_DURATION);
+ rc = i2c_read(tpm_dev.bus, tpm_dev.addr,
+ 0, 0, buffer, len);
+ if (rc == 0)
+ break; /* success, break to skip sleep */
+
+ }
+ } else {
+ /* use a combined read for newer chips
+ * unfortunately the smbus functions are not suitable due to
+ * the 32 byte limit of the smbus.
+ * retries should usually not be needed, but are kept just to
+ * be safe on the safe side.
+ */
+ for (count = 0; count < MAX_COUNT; count++) {
+ rc = i2c_read(tpm_dev.bus, tpm_dev.addr,
+ addr, 1, buffer, len);
+ if (rc == 0)
+ break; /* break here to skip sleep */
+ udelay(SLEEP_DURATION);
+ }
+ }
+
+ /* take care of 'guard time' */
+ udelay(SLEEP_DURATION);
+ if (rc)
+ return -rc;
+
+ return 0;
+}
+
+static int iic_tpm_write_generic(uint8_t addr, uint8_t *buffer, size_t len,
+ unsigned int sleep_time,
+ uint8_t max_count)
+{
+ int rc = 0;
+ int count;
+
+ if (len > TPM_BUFSIZE) {
+ printk(BIOS_DEBUG, "%s: Length %d is too large\n", __func__, len);
+ return -1;
+ }
+
+ /* prepare send buffer */
+ tpm_dev.buf[0] = addr;
+ memcpy(&(tpm_dev.buf[1]), buffer, len);
+
+ if (!tpm_dev.bus)
+ return -1;
+ for (count = 0; count < max_count; count++) {
+ rc = i2c_write(tpm_dev.bus, tpm_dev.addr, 0, 0,
+ tpm_dev.buf, len + 1);
+ if (rc == 0)
+ break; /* success, break to skip sleep */
+
+ udelay(sleep_time);
+ }
+
+ /* take care of 'guard time' */
+ udelay(SLEEP_DURATION);
+ if (rc)
+ return -rc;
+
+ return 0;
+}
+
+/*
+ * iic_tpm_write() - write to TPM register
+ * @addr: register address to write to
+ * @buffer: containing data to be written
+ * @len: number of bytes to write
+ *
+ * Write len bytes from provided buffer to TPM register (little
+ * endian format, i.e. buffer[0] is written as first byte).
+ *
+ * NOTE: TPM is big-endian for multi-byte values. Multi-byte
+ * values have to be swapped.
+ *
+ * NOTE: use this function instead of the iic_tpm_write_generic function.
+ *
+ * Return -EIO on error, 0 on success
+ */
+static int iic_tpm_write(uint8_t addr, uint8_t *buffer, size_t len)
+{
+ return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION,
+ MAX_COUNT);
+}
+
+/*
+ * This function is needed especially for the cleanup situation after
+ * sending TPM_READY
+ * */
+static int iic_tpm_write_long(uint8_t addr, uint8_t *buffer, size_t len)
+{
+ return iic_tpm_write_generic(addr, buffer, len, SLEEP_DURATION_LONG,
+ MAX_COUNT_LONG);
+}
+
+#define TPM_HEADER_SIZE 10
+
+enum tis_access {
+ TPM_ACCESS_VALID = 0x80,
+ TPM_ACCESS_ACTIVE_LOCALITY = 0x20,
+ TPM_ACCESS_REQUEST_PENDING = 0x04,
+ TPM_ACCESS_REQUEST_USE = 0x02,
+};
+
+enum tis_status {
+ TPM_STS_VALID = 0x80,
+ TPM_STS_COMMAND_READY = 0x40,
+ TPM_STS_GO = 0x20,
+ TPM_STS_DATA_AVAIL = 0x10,
+ TPM_STS_DATA_EXPECT = 0x08,
+};
+
+#define TPM_ACCESS(l) (0x0000 | ((l) << 4))
+#define TPM_STS(l) (0x0001 | ((l) << 4))
+#define TPM_DATA_FIFO(l) (0x0005 | ((l) << 4))
+#define TPM_DID_VID(l) (0x0006 | ((l) << 4))
+
+static int check_locality(struct tpm_chip *chip, int loc)
+{
+ uint8_t buf;
+ int rc;
+
+ rc = iic_tpm_read(TPM_ACCESS(loc), &buf, 1);
+ if (rc < 0)
+ return rc;
+
+ if ((buf & (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) ==
+ (TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID)) {
+ chip->vendor.locality = loc;
+ return loc;
+ }
+
+ return -1;
+}
+
+static void release_locality(struct tpm_chip *chip, int loc, int force)
+{
+ uint8_t buf;
+ if (iic_tpm_read(TPM_ACCESS(loc), &buf, 1) < 0)
+ return;
+
+ if (force || (buf & (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) ==
+ (TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID)) {
+ buf = TPM_ACCESS_ACTIVE_LOCALITY;
+ iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
+ }
+}
+
+static int request_locality(struct tpm_chip *chip, int loc)
+{
+ uint8_t buf = TPM_ACCESS_REQUEST_USE;
+
+ if (check_locality(chip, loc) >= 0)
+ return loc; /* we already have the locality */
+
+ iic_tpm_write(TPM_ACCESS(loc), &buf, 1);
+
+ /* wait for burstcount */
+ int timeout = 2 * 1000; /* 2s timeout */
+ while (timeout) {
+ if (check_locality(chip, loc) >= 0)
+ return loc;
+ mdelay(TPM_TIMEOUT);
+ timeout--;
+ }
+
+ return -1;
+}
+
+static uint8_t tpm_tis_i2c_status(struct tpm_chip *chip)
+{
+ /* NOTE: since i2c read may fail, return 0 in this case --> time-out */
+ uint8_t buf;
+ if (iic_tpm_read(TPM_STS(chip->vendor.locality), &buf, 1) < 0)
+ return 0;
+ else
+ return buf;
+}
+
+static void tpm_tis_i2c_ready(struct tpm_chip *chip)
+{
+ /* this causes the current command to be aborted */
+ uint8_t buf = TPM_STS_COMMAND_READY;
+ iic_tpm_write_long(TPM_STS(chip->vendor.locality), &buf, 1);
+}
+
+static ssize_t get_burstcount(struct tpm_chip *chip)
+{
+ ssize_t burstcnt;
+ uint8_t buf[3];
+
+ /* wait for burstcount */
+ int timeout = 2 * 1000; /* 2s timeout */
+ while (timeout) {
+ /* Note: STS is little endian */
+ if (iic_tpm_read(TPM_STS(chip->vendor.locality) + 1, buf, 3) < 0)
+ burstcnt = 0;
+ else
+ burstcnt = (buf[2] << 16) + (buf[1] << 8) + buf[0];
+
+ if (burstcnt)
+ return burstcnt;
+ mdelay(TPM_TIMEOUT);
+ timeout--;
+ }
+ return -1; //EBUSY;
+}
+
+static int wait_for_stat(struct tpm_chip *chip, uint8_t mask, int *status)
+{
+ unsigned long timeout = 2 * 1024;
+ while (timeout) {
+ *status = tpm_tis_i2c_status(chip);
+ if ((*status & mask) == mask)
+ return 0;
+ mdelay(TPM_TIMEOUT);
+ timeout--;
+ }
+
+ return -1; //ETIME;
+}
+
+static int recv_data(struct tpm_chip *chip, uint8_t *buf, size_t count)
+{
+ size_t size = 0;
+ ssize_t burstcnt;
+ int rc;
+
+ while (size < count) {
+ burstcnt = get_burstcount(chip);
+
+ /* burstcount < 0 = tpm is busy */
+ if (burstcnt < 0)
+ return burstcnt;
+
+ /* limit received data to max. left */
+ if (burstcnt > (count - size))
+ burstcnt = count - size;
+
+ rc = iic_tpm_read(TPM_DATA_FIFO(chip->vendor.locality),
+ &(buf[size]),
+ burstcnt);
+ if (rc == 0)
+ size += burstcnt;
+
+ }
+ return size;
+}
+
+static int tpm_tis_i2c_recv(struct tpm_chip *chip, uint8_t *buf, size_t count)
+{
+ int size = 0;
+ uint32_t expected;
+ int status;
+
+ if (count < TPM_HEADER_SIZE) {
+ size = -1; //EIO;
+ goto out;
+ }
+
+ /* read first 10 bytes, including tag, paramsize, and result */
+ size = recv_data(chip, buf, TPM_HEADER_SIZE);
+ if (size < TPM_HEADER_SIZE) {
+ printk(BIOS_DEBUG, "tpm_tis_i2c_recv: Unable to read header\n");
+ goto out;
+ }
+
+ memcpy(&expected, buf + TPM_RSP_SIZE_BYTE, sizeof(expected));
+ expected = be32_to_cpu(expected);
+ if ((size_t)expected > count) {
+ size = -1; //EIO;
+ goto out;
+ }
+
+ size += recv_data(chip, &buf[TPM_HEADER_SIZE],
+ expected - TPM_HEADER_SIZE);
+ if (size < expected) {
+ printk(BIOS_DEBUG, "tpm_tis_i2c_recv: Unable to "
+ "read remainder of result\n");
+ size = -1; //ETIME;
+ goto out;
+ }
+
+ wait_for_stat(chip, TPM_STS_VALID, &status);
+ if (status & TPM_STS_DATA_AVAIL) { /* retry? */
+ printk(BIOS_DEBUG, "tpm_tis_i2c_recv: Error left over data\n");
+ size = -1; //EIO;
+ goto out;
+ }
+
+out:
+ tpm_tis_i2c_ready(chip);
+
+ return size;
+}
+
+static int tpm_tis_i2c_send(struct tpm_chip *chip, uint8_t *buf, size_t len)
+{
+ int rc, status;
+ ssize_t burstcnt;
+ size_t count = 0;
+ uint8_t sts = TPM_STS_GO;
+
+ if (len > TPM_BUFSIZE)
+ return -1; //E2BIG; /* command is too long for our tpm, sorry */
+
+ status = tpm_tis_i2c_status(chip);
+ if ((status & TPM_STS_COMMAND_READY) == 0) {
+ tpm_tis_i2c_ready(chip);
+ if (wait_for_stat(chip, TPM_STS_COMMAND_READY, &status) < 0) {
+ rc = -1; //ETIME;
+ goto out_err;
+ }
+ }
+
+ while (count < len - 1) {
+ burstcnt = get_burstcount(chip);
+
+ /* burstcount < 0 = tpm is busy */
+ if (burstcnt < 0)
+ return burstcnt;
+
+ if (burstcnt > (len-1-count))
+ burstcnt = len-1-count;
+
+#ifdef CONFIG_TPM_I2C_BURST_LIMITATION
+ if (burstcnt > CONFIG_TPM_I2C_BURST_LIMITATION)
+ burstcnt = CONFIG_TPM_I2C_BURST_LIMITATION;
+#endif /* CONFIG_TPM_I2C_BURST_LIMITATION */
+
+ rc = iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality),
+ &(buf[count]), burstcnt);
+ if (rc == 0)
+ count += burstcnt;
+
+ wait_for_stat(chip, TPM_STS_VALID, &status);
+
+ if ((status & TPM_STS_DATA_EXPECT) == 0) {
+ rc = -1; //EIO;
+ goto out_err;
+ }
+
+ }
+
+ /* write last byte */
+ iic_tpm_write(TPM_DATA_FIFO(chip->vendor.locality), &(buf[count]), 1);
+ wait_for_stat(chip, TPM_STS_VALID, &status);
+ if ((status & TPM_STS_DATA_EXPECT) != 0) {
+ rc = -1; //EIO;
+ goto out_err;
+ }
+
+ /* go and do it */
+ iic_tpm_write(TPM_STS(chip->vendor.locality), &sts, 1);
+
+ return len;
+out_err:
+ tpm_tis_i2c_ready(chip);
+
+ return rc;
+}
+
+static struct tpm_vendor_specific tpm_tis_i2c = {
+ .status = tpm_tis_i2c_status,
+ .recv = tpm_tis_i2c_recv,
+ .send = tpm_tis_i2c_send,
+ .cancel = tpm_tis_i2c_ready,
+ .req_complete_mask = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ .req_complete_val = TPM_STS_DATA_AVAIL | TPM_STS_VALID,
+ .req_canceled = TPM_STS_COMMAND_READY,
+};
+
+/* initialisation of i2c tpm */
+
+
+int tpm_vendor_init(unsigned bus, uint32_t dev_addr)
+{
+ uint32_t vendor;
+ unsigned int old_addr;
+ int rc = 0;
+ struct tpm_chip *chip;
+
+ old_addr = tpm_dev.addr;
+ if (dev_addr != 0)
+ tpm_dev.addr = dev_addr;
+ tpm_dev.bus = bus;
+
+ chip = tpm_register_hardware(&tpm_tis_i2c);
+ if (chip < 0) {
+ rc = -1; //ENODEV;
+ goto out_err;
+ }
+
+ /* Disable interrupts (not supported) */
+ chip->vendor.irq = 0;
+
+ if (request_locality(chip, 0) != 0) {
+ rc = -1; //ENODEV;
+ goto out_err;
+ }
+
+ /* read four bytes from DID_VID register */
+ if (iic_tpm_read(TPM_DID_VID(0), (uint8_t *)&vendor, 4) < 0) {
+ rc = -1; //EIO;
+ goto out_release;
+ }
+
+ if (vendor == TPM_TIS_I2C_DID_VID_9645) {
+ tpm_dev.chip_type = SLB9645;
+ } else if (be32_to_cpu(vendor) == TPM_TIS_I2C_DID_VID_9635) {
+ tpm_dev.chip_type = SLB9635;
+ } else {
+ printk(BIOS_DEBUG, "Vendor ID 0x%08x not recognized.\n", vendor);
+ rc = -1; //ENODEV;
+ goto out_release;
+ }
+
+ printk(BIOS_DEBUG, "1.2 TPM (chip type %s device-id 0x%X)\n",
+ chip_name[tpm_dev.chip_type], vendor >> 16);
+
+ /*
+ * A timeout query to TPM can be placed here.
+ * Standard timeout values are used so far
+ */
+
+ return 0;
+
+out_release:
+ release_locality(chip, 0, 1);
+
+out_err:
+ tpm_dev.addr = old_addr;
+ return rc;
+}
+
+void tpm_vendor_cleanup(struct tpm_chip *chip)
+{
+ release_locality(chip, chip->vendor.locality, 1);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-30 23:55:59 +0000