[PATCH] tpm: Support for Infineon TPM
Marcel Selhorst [Wed, 27 Jul 2005 18:45:12 +0000 (11:45 -0700)]
This patch provides a new device driver for the Infineon SLD 9630 TT Trusted
Platform Module (TPM 1.1b) [1] which is embedded on Intel- mainboards or in
HP/ Fujitsu-Siemens / Toshiba-Notebooks.  A nearly complete list where this
module is integrated in can be found in [2].

This kernel module acts as a communication gateway between the linux kernel
and the hardware chip and fits the TPM-specific interfaces created by IBM in
drivers/char/tpm/tpm.h

Further information about this module and a list of succesfully tested and
therefore supported hardware can be found at our project page [3].

[1]
http://www.infineon.com/cgi/ecrm.dll/ecrm/scripts/public_download.jsp?oid=114135&parent_oid=29049

[2]
http://www.tonymcfadden.net/tpmvendors.htm

[3]
http://www.prosec.rub.de/tpm

Signed-off-by: Marcel Selhorst <selhorst@crypto.rub.de>
Acked-by: Kylene Jo Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/tpm/Kconfig
drivers/char/tpm/Makefile
drivers/char/tpm/tpm_infineon.c [new file with mode: 0644]

index 7a96977..94a3b3e 100644 (file)
@@ -35,5 +35,16 @@ config TCG_ATMEL
          will be accessible from within Linux.  To compile this driver 
          as a module, choose M here; the module will be called tpm_atmel.
 
+config TCG_INFINEON
+       tristate "Infineon Technologies SLD 9630 TPM Interface"
+       depends on TCG_TPM
+       ---help---
+         If you have a TPM security chip from Infineon Technologies
+         say Yes and it will be accessible from within Linux.  To
+         compile this driver as a module, choose M here; the module
+         will be called tpm_infineon.
+         Further information on this driver and the supported hardware
+         can be found at http://www.prosec.rub.de/tpm
+
 endmenu
 
index 736d3df..2392e40 100644 (file)
@@ -4,4 +4,4 @@
 obj-$(CONFIG_TCG_TPM) += tpm.o
 obj-$(CONFIG_TCG_NSC) += tpm_nsc.o
 obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
-
+obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o
diff --git a/drivers/char/tpm/tpm_infineon.c b/drivers/char/tpm/tpm_infineon.c
new file mode 100644 (file)
index 0000000..07542f9
--- /dev/null
@@ -0,0 +1,467 @@
+/*
+ * Description:
+ * Device Driver for the Infineon Technologies
+ * SLD 9630 TT Trusted Platform Module
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * Copyright (C) 2005, Marcel Selhorst <selhorst@crypto.rub.de>
+ * Applied Data Security Group, Ruhr-University Bochum, Germany
+ * Project-Homepage: http://www.prosec.rub.de/tpm
+ *
+ * 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.
+ *
+ */
+
+#include "tpm.h"
+
+/* Infineon specific definitions */
+/* maximum number of WTX-packages */
+#define        TPM_MAX_WTX_PACKAGES    50
+/* msleep-Time for WTX-packages */
+#define        TPM_WTX_MSLEEP_TIME     20
+/* msleep-Time --> Interval to check status register */
+#define        TPM_MSLEEP_TIME         3
+/* gives number of max. msleep()-calls before throwing timeout */
+#define        TPM_MAX_TRIES           5000
+#define        TCPA_INFINEON_DEV_VEN_VALUE     0x15D1
+#define        TPM_DATA                        (TPM_ADDR + 1) & 0xff
+
+/* TPM header definitions */
+enum infineon_tpm_header {
+       TPM_VL_VER = 0x01,
+       TPM_VL_CHANNEL_CONTROL = 0x07,
+       TPM_VL_CHANNEL_PERSONALISATION = 0x0A,
+       TPM_VL_CHANNEL_TPM = 0x0B,
+       TPM_VL_CONTROL = 0x00,
+       TPM_INF_NAK = 0x15,
+       TPM_CTRL_WTX = 0x10,
+       TPM_CTRL_WTX_ABORT = 0x18,
+       TPM_CTRL_WTX_ABORT_ACK = 0x18,
+       TPM_CTRL_ERROR = 0x20,
+       TPM_CTRL_CHAININGACK = 0x40,
+       TPM_CTRL_CHAINING = 0x80,
+       TPM_CTRL_DATA = 0x04,
+       TPM_CTRL_DATA_CHA = 0x84,
+       TPM_CTRL_DATA_CHA_ACK = 0xC4
+};
+
+enum infineon_tpm_register {
+       WRFIFO = 0x00,
+       RDFIFO = 0x01,
+       STAT = 0x02,
+       CMD = 0x03
+};
+
+enum infineon_tpm_command_bits {
+       CMD_DIS = 0x00,
+       CMD_LP = 0x01,
+       CMD_RES = 0x02,
+       CMD_IRQC = 0x06
+};
+
+enum infineon_tpm_status_bits {
+       STAT_XFE = 0x00,
+       STAT_LPA = 0x01,
+       STAT_FOK = 0x02,
+       STAT_TOK = 0x03,
+       STAT_IRQA = 0x06,
+       STAT_RDA = 0x07
+};
+
+/* some outgoing values */
+enum infineon_tpm_values {
+       CHIP_ID1 = 0x20,
+       CHIP_ID2 = 0x21,
+       DAR = 0x30,
+       RESET_LP_IRQC_DISABLE = 0x41,
+       ENABLE_REGISTER_PAIR = 0x55,
+       IOLIMH = 0x60,
+       IOLIML = 0x61,
+       DISABLE_REGISTER_PAIR = 0xAA,
+       IDVENL = 0xF1,
+       IDVENH = 0xF2,
+       IDPDL = 0xF3,
+       IDPDH = 0xF4
+};
+
+static int number_of_wtx;
+
+static int empty_fifo(struct tpm_chip *chip, int clear_wrfifo)
+{
+       int status;
+       int check = 0;
+       int i;
+
+       if (clear_wrfifo) {
+               for (i = 0; i < 4096; i++) {
+                       status = inb(chip->vendor->base + WRFIFO);
+                       if (status == 0xff) {
+                               if (check == 5)
+                                       break;
+                               else
+                                       check++;
+                       }
+               }
+       }
+       /* Note: The values which are currently in the FIFO of the TPM
+          are thrown away since there is no usage for them. Usually,
+          this has nothing to say, since the TPM will give its answer
+          immediately or will be aborted anyway, so the data here is
+          usually garbage and useless.
+          We have to clean this, because the next communication with
+          the TPM would be rubbish, if there is still some old data
+          in the Read FIFO.
+        */
+       i = 0;
+       do {
+               status = inb(chip->vendor->base + RDFIFO);
+               status = inb(chip->vendor->base + STAT);
+               i++;
+               if (i == TPM_MAX_TRIES)
+                       return -EIO;
+       } while ((status & (1 << STAT_RDA)) != 0);
+       return 0;
+}
+
+static int wait(struct tpm_chip *chip, int wait_for_bit)
+{
+       int status;
+       int i;
+       for (i = 0; i < TPM_MAX_TRIES; i++) {
+               status = inb(chip->vendor->base + STAT);
+               /* check the status-register if wait_for_bit is set */
+               if (status & 1 << wait_for_bit)
+                       break;
+               msleep(TPM_MSLEEP_TIME);
+       }
+       if (i == TPM_MAX_TRIES) {       /* timeout occurs */
+               if (wait_for_bit == STAT_XFE)
+                       dev_err(&chip->pci_dev->dev,
+                               "Timeout in wait(STAT_XFE)\n");
+               if (wait_for_bit == STAT_RDA)
+                       dev_err(&chip->pci_dev->dev,
+                               "Timeout in wait(STAT_RDA)\n");
+               return -EIO;
+       }
+       return 0;
+};
+
+static void wait_and_send(struct tpm_chip *chip, u8 sendbyte)
+{
+       wait(chip, STAT_XFE);
+       outb(sendbyte, chip->vendor->base + WRFIFO);
+}
+
+    /* Note: WTX means Waiting-Time-Extension. Whenever the TPM needs more
+       calculation time, it sends a WTX-package, which has to be acknowledged
+       or aborted. This usually occurs if you are hammering the TPM with key
+       creation. Set the maximum number of WTX-packages in the definitions
+       above, if the number is reached, the waiting-time will be denied
+       and the TPM command has to be resend.
+     */
+
+static void tpm_wtx(struct tpm_chip *chip)
+{
+       number_of_wtx++;
+       dev_info(&chip->pci_dev->dev, "Granting WTX (%02d / %02d)\n",
+                number_of_wtx, TPM_MAX_WTX_PACKAGES);
+       wait_and_send(chip, TPM_VL_VER);
+       wait_and_send(chip, TPM_CTRL_WTX);
+       wait_and_send(chip, 0x00);
+       wait_and_send(chip, 0x00);
+       msleep(TPM_WTX_MSLEEP_TIME);
+}
+
+static void tpm_wtx_abort(struct tpm_chip *chip)
+{
+       dev_info(&chip->pci_dev->dev, "Aborting WTX\n");
+       wait_and_send(chip, TPM_VL_VER);
+       wait_and_send(chip, TPM_CTRL_WTX_ABORT);
+       wait_and_send(chip, 0x00);
+       wait_and_send(chip, 0x00);
+       number_of_wtx = 0;
+       msleep(TPM_WTX_MSLEEP_TIME);
+}
+
+static int tpm_inf_recv(struct tpm_chip *chip, u8 * buf, size_t count)
+{
+       int i;
+       int ret;
+       u32 size = 0;
+
+recv_begin:
+       /* start receiving header */
+       for (i = 0; i < 4; i++) {
+               ret = wait(chip, STAT_RDA);
+               if (ret)
+                       return -EIO;
+               buf[i] = inb(chip->vendor->base + RDFIFO);
+       }
+
+       if (buf[0] != TPM_VL_VER) {
+               dev_err(&chip->pci_dev->dev,
+                       "Wrong transport protocol implementation!\n");
+               return -EIO;
+       }
+
+       if (buf[1] == TPM_CTRL_DATA) {
+               /* size of the data received */
+               size = ((buf[2] << 8) | buf[3]);
+
+               for (i = 0; i < size; i++) {
+                       wait(chip, STAT_RDA);
+                       buf[i] = inb(chip->vendor->base + RDFIFO);
+               }
+
+               if ((size == 0x6D00) && (buf[1] == 0x80)) {
+                       dev_err(&chip->pci_dev->dev,
+                               "Error handling on vendor layer!\n");
+                       return -EIO;
+               }
+
+               for (i = 0; i < size; i++)
+                       buf[i] = buf[i + 6];
+
+               size = size - 6;
+               return size;
+       }
+
+       if (buf[1] == TPM_CTRL_WTX) {
+               dev_info(&chip->pci_dev->dev, "WTX-package received\n");
+               if (number_of_wtx < TPM_MAX_WTX_PACKAGES) {
+                       tpm_wtx(chip);
+                       goto recv_begin;
+               } else {
+                       tpm_wtx_abort(chip);
+                       goto recv_begin;
+               }
+       }
+
+       if (buf[1] == TPM_CTRL_WTX_ABORT_ACK) {
+               dev_info(&chip->pci_dev->dev, "WTX-abort acknowledged\n");
+               return size;
+       }
+
+       if (buf[1] == TPM_CTRL_ERROR) {
+               dev_err(&chip->pci_dev->dev, "ERROR-package received:\n");
+               if (buf[4] == TPM_INF_NAK)
+                       dev_err(&chip->pci_dev->dev,
+                               "-> Negative acknowledgement"
+                               " - retransmit command!\n");
+               return -EIO;
+       }
+       return -EIO;
+}
+
+static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t count)
+{
+       int i;
+       int ret;
+       u8 count_high, count_low, count_4, count_3, count_2, count_1;
+
+       /* Disabling Reset, LP and IRQC */
+       outb(RESET_LP_IRQC_DISABLE, chip->vendor->base + CMD);
+
+       ret = empty_fifo(chip, 1);
+       if (ret) {
+               dev_err(&chip->pci_dev->dev, "Timeout while clearing FIFO\n");
+               return -EIO;
+       }
+
+       ret = wait(chip, STAT_XFE);
+       if (ret)
+               return -EIO;
+
+       count_4 = (count & 0xff000000) >> 24;
+       count_3 = (count & 0x00ff0000) >> 16;
+       count_2 = (count & 0x0000ff00) >> 8;
+       count_1 = (count & 0x000000ff);
+       count_high = ((count + 6) & 0xffffff00) >> 8;
+       count_low = ((count + 6) & 0x000000ff);
+
+       /* Sending Header */
+       wait_and_send(chip, TPM_VL_VER);
+       wait_and_send(chip, TPM_CTRL_DATA);
+       wait_and_send(chip, count_high);
+       wait_and_send(chip, count_low);
+
+       /* Sending Data Header */
+       wait_and_send(chip, TPM_VL_VER);
+       wait_and_send(chip, TPM_VL_CHANNEL_TPM);
+       wait_and_send(chip, count_4);
+       wait_and_send(chip, count_3);
+       wait_and_send(chip, count_2);
+       wait_and_send(chip, count_1);
+
+       /* Sending Data */
+       for (i = 0; i < count; i++) {
+               wait_and_send(chip, buf[i]);
+       }
+       return count;
+}
+
+static void tpm_inf_cancel(struct tpm_chip *chip)
+{
+       /* Nothing yet!
+          This has something to do with the internal functions
+          of the TPM. Abort isn't really necessary...
+        */
+}
+
+static DEVICE_ATTR(pubek, S_IRUGO, tpm_show_pubek, NULL);
+static DEVICE_ATTR(pcrs, S_IRUGO, tpm_show_pcrs, NULL);
+static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps, NULL);
+static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
+
+static struct attribute *inf_attrs[] = {
+       &dev_attr_pubek.attr,
+       &dev_attr_pcrs.attr,
+       &dev_attr_caps.attr,
+       &dev_attr_cancel.attr,
+       NULL,
+};
+
+static struct attribute_group inf_attr_grp = {.attrs = inf_attrs };
+
+static struct file_operations inf_ops = {
+       .owner = THIS_MODULE,
+       .llseek = no_llseek,
+       .open = tpm_open,
+       .read = tpm_read,
+       .write = tpm_write,
+       .release = tpm_release,
+};
+
+static struct tpm_vendor_specific tpm_inf = {
+       .recv = tpm_inf_recv,
+       .send = tpm_inf_send,
+       .cancel = tpm_inf_cancel,
+       .req_complete_mask = 0,
+       .req_complete_val = 0,
+       .attr_group = &inf_attr_grp,
+       .miscdev = {.fops = &inf_ops,},
+};
+
+static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
+                                  const struct pci_device_id *pci_id)
+{
+       int rc = 0;
+       u8 iol, ioh;
+       int vendorid[2];
+       int version[2];
+       int productid[2];
+
+       if (pci_enable_device(pci_dev))
+               return -EIO;
+
+       dev_info(&pci_dev->dev, "LPC-bus found at 0x%x\n", pci_id->device);
+
+       /* query chip for its vendor, its version number a.s.o. */
+       outb(ENABLE_REGISTER_PAIR, TPM_ADDR);
+       outb(IDVENL, TPM_ADDR);
+       vendorid[1] = inb(TPM_DATA);
+       outb(IDVENH, TPM_ADDR);
+       vendorid[0] = inb(TPM_DATA);
+       outb(IDPDL, TPM_ADDR);
+       productid[1] = inb(TPM_DATA);
+       outb(IDPDH, TPM_ADDR);
+       productid[0] = inb(TPM_DATA);
+       outb(CHIP_ID1, TPM_ADDR);
+       version[1] = inb(TPM_DATA);
+       outb(CHIP_ID2, TPM_ADDR);
+       version[0] = inb(TPM_DATA);
+
+       if ((vendorid[0] << 8 | vendorid[1]) == (TCPA_INFINEON_DEV_VEN_VALUE)) {
+
+               /* read IO-ports from TPM */
+               outb(IOLIMH, TPM_ADDR);
+               ioh = inb(TPM_DATA);
+               outb(IOLIML, TPM_ADDR);
+               iol = inb(TPM_DATA);
+               tpm_inf.base = (ioh << 8) | iol;
+
+               if (tpm_inf.base == 0) {
+                       dev_err(&pci_dev->dev, "No IO-ports set!\n");
+                       pci_disable_device(pci_dev);
+                       return -ENODEV;
+               }
+
+               /* activate register */
+               outb(DAR, TPM_ADDR);
+               outb(0x01, TPM_DATA);
+               outb(DISABLE_REGISTER_PAIR, TPM_ADDR);
+
+               /* disable RESET, LP and IRQC */
+               outb(RESET_LP_IRQC_DISABLE, tpm_inf.base + CMD);
+
+               /* Finally, we're done, print some infos */
+               dev_info(&pci_dev->dev, "TPM found: "
+                        "io base 0x%x, "
+                        "chip version %02x%02x, "
+                        "vendor id %x%x (Infineon), "
+                        "product id %02x%02x"
+                        "%s\n",
+                        tpm_inf.base,
+                        version[0], version[1],
+                        vendorid[0], vendorid[1],
+                        productid[0], productid[1], ((productid[0] == 0)
+                                                     && (productid[1] ==
+                                                         6)) ?
+                        " (SLD 9630 TT 1.1)" : "");
+
+               rc = tpm_register_hardware(pci_dev, &tpm_inf);
+               if (rc < 0) {
+                       pci_disable_device(pci_dev);
+                       return -ENODEV;
+               }
+               return 0;
+       } else {
+               dev_info(&pci_dev->dev, "No Infineon TPM found!\n");
+               pci_disable_device(pci_dev);
+               return -ENODEV;
+       }
+}
+
+static struct pci_device_id tpm_pci_tbl[] __devinitdata = {
+       {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801BA_0)},
+       {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801CA_12)},
+       {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_0)},
+       {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801DB_12)},
+       {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801EB_0)},
+       {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_0)},
+       {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_1)},
+       {PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_ICH6_2)},
+       {0,}
+};
+
+MODULE_DEVICE_TABLE(pci, tpm_pci_tbl);
+
+static struct pci_driver inf_pci_driver = {
+       .name = "tpm_inf",
+       .id_table = tpm_pci_tbl,
+       .probe = tpm_inf_probe,
+       .remove = __devexit_p(tpm_remove),
+       .suspend = tpm_pm_suspend,
+       .resume = tpm_pm_resume,
+};
+
+static int __init init_inf(void)
+{
+       return pci_register_driver(&inf_pci_driver);
+}
+
+static void __exit cleanup_inf(void)
+{
+       pci_unregister_driver(&inf_pci_driver);
+}
+
+module_init(init_inf);
+module_exit(cleanup_inf);
+
+MODULE_AUTHOR("Marcel Selhorst <selhorst@crypto.rub.de>");
+MODULE_DESCRIPTION("Driver for Infineon TPM SLD 9630 TT");
+MODULE_VERSION("1.4");
+MODULE_LICENSE("GPL");