[PATCH] tpm_infineon: Support for new TPM 1.2 and PNPACPI

This patch includes support for the new Infineon Trusted Platform Module
SLB 9635 TT 1.2 and does further include ACPI-support for both chip
versions (SLD 9630 TT 1.1 and SLB9635 TT 1.2).  Since the ioports and
configuration registers are not correctly set on some machines, the
configuration is now done via PNPACPI, which reads out the correct values
out of the DSDT-table.  Note that you have to have CONFIG_PNP,
CONFIG_ACPI_BUS and CONFIG_PNPACPI enabled to run this driver (assuming
that mainboards including a TPM do have the need for ACPI anyway).

Signed-off-by: Marcel Selhorst <selhorst@crypto.rub.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 106 insertions, 40 deletions

diff --git a/drivers/char/tpm/tpm_infineon.c b/drivers/char/tpm/tpm_infineon.c
index 0e3241645c19..dc8c540391fd 100644
--- a/drivers/char/tpm/tpm_infineon.c
+++ b/drivers/char/tpm/tpm_infineon.c
@@ -1,7 +1,7 @@
 /*
  * Description:
  * Device Driver for the Infineon Technologies
- * SLD 9630 TT Trusted Platform Module
+ * SLD 9630 TT 1.1 and SLB 9635 TT 1.2 Trusted Platform Module
  * Specifications at www.trustedcomputinggroup.org
  *
  * Copyright (C) 2005, Marcel Selhorst <selhorst@crypto.rub.de>
@@ -12,9 +12,10 @@
  * modify it under the terms of the GNU General Public License as
  * published by the Free Software Foundation, version 2 of the
  * License.
- *
  */
 
+#include <acpi/acpi_bus.h>
+#include <linux/pnp.h>
 #include "tpm.h"
 
 /* Infineon specific definitions */
@@ -26,8 +27,11 @@
 #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
+#define	TPM_INFINEON_DEV_VEN_VALUE	0x15D1
+
+/* These values will be filled after ACPI-call */
+static int TPM_INF_DATA = 0;
+static int TPM_INF_ADDR = 0;
 
 /* TPM header definitions */
 enum infineon_tpm_header {
@@ -305,9 +309,10 @@ static int tpm_inf_send(struct tpm_chip *chip, u8 * buf, size_t 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...
+	/*
+	   Since we are using the legacy mode to communicate
+	   with the TPM, we have no cancel functions, but have
+	   a workaround for interrupting the TPM through WTX.
 	 */
 }
 
@@ -345,6 +350,32 @@ static struct tpm_vendor_specific tpm_inf = {
 	.miscdev = {.fops = &inf_ops,},
 };
 
+static const struct pnp_device_id tpm_pnp_tbl[] = {
+	/* Infineon TPMs */
+	{"IFX0101", 0},
+	{"IFX0102", 0},
+	{"", 0}
+};
+
+static int __devinit tpm_inf_acpi_probe(struct pnp_dev *dev,
+					const struct pnp_device_id *dev_id)
+{
+	TPM_INF_ADDR = (pnp_port_start(dev, 0) & 0xff);
+	TPM_INF_DATA = ((TPM_INF_ADDR + 1) & 0xff);
+	tpm_inf.base = pnp_port_start(dev, 1);
+	dev_info(&dev->dev, "Found %s with ID %s\n",
+		 dev->name, dev_id->id);
+	if (!((tpm_inf.base >> 8) & 0xff))
+		tpm_inf.base = 0;
+	return 0;
+}
+
+static struct pnp_driver tpm_inf_pnp = {
+	.name = "tpm_inf_pnp",
+	.id_table = tpm_pnp_tbl,
+	.probe = tpm_inf_acpi_probe,
+};
+
 static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
 				   const struct pci_device_id *pci_id)
 {
@@ -353,64 +384,99 @@ static int __devinit tpm_inf_probe(struct pci_dev *pci_dev,
 	int vendorid[2];
 	int version[2];
 	int productid[2];
+	char chipname[20];
 
 	if (pci_enable_device(pci_dev))
 		return -EIO;
 
 	dev_info(&pci_dev->dev, "LPC-bus found at 0x%x\n", pci_id->device);
 
+	/* read IO-ports from ACPI */
+	pnp_register_driver(&tpm_inf_pnp);
+	pnp_unregister_driver(&tpm_inf_pnp);
+
+	/* Make sure, we have received valid config ports */
+	if (!TPM_INF_ADDR) {
+		pci_disable_device(pci_dev);
+		return -EIO;
+	}
+
 	/* 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;
+	outb(ENABLE_REGISTER_PAIR, TPM_INF_ADDR);
+	outb(IDVENL, TPM_INF_ADDR);
+	vendorid[1] = inb(TPM_INF_DATA);
+	outb(IDVENH, TPM_INF_ADDR);
+	vendorid[0] = inb(TPM_INF_DATA);
+	outb(IDPDL, TPM_INF_ADDR);
+	productid[1] = inb(TPM_INF_DATA);
+	outb(IDPDH, TPM_INF_ADDR);
+	productid[0] = inb(TPM_INF_DATA);
+	outb(CHIP_ID1, TPM_INF_ADDR);
+	version[1] = inb(TPM_INF_DATA);
+	outb(CHIP_ID2, TPM_INF_ADDR);
+	version[0] = inb(TPM_INF_DATA);
+
+	switch ((productid[0] << 8) | productid[1]) {
+	case 6:
+		sprintf(chipname, " (SLD 9630 TT 1.1)");
+		break;
+	case 11:
+		sprintf(chipname, " (SLB 9635 TT 1.2)");
+		break;
+	default:
+		sprintf(chipname, " (unknown chip)");
+		break;
+	}
+	chipname[19] = 0;
+
+	if ((vendorid[0] << 8 | vendorid[1]) == (TPM_INFINEON_DEV_VEN_VALUE)) {
 
 		if (tpm_inf.base == 0) {
-			dev_err(&pci_dev->dev, "No IO-ports set!\n");
+			dev_err(&pci_dev->dev, "No IO-ports found!\n");
 			pci_disable_device(pci_dev);
-			return -ENODEV;
+			return -EIO;
+		}
+		/* configure TPM with IO-ports */
+		outb(IOLIMH, TPM_INF_ADDR);
+		outb(((tpm_inf.base >> 8) & 0xff), TPM_INF_DATA);
+		outb(IOLIML, TPM_INF_ADDR);
+		outb((tpm_inf.base & 0xff), TPM_INF_DATA);
+
+		/* control if IO-ports are set correctly */
+		outb(IOLIMH, TPM_INF_ADDR);
+		ioh = inb(TPM_INF_DATA);
+		outb(IOLIML, TPM_INF_ADDR);
+		iol = inb(TPM_INF_DATA);
+
+		if ((ioh << 8 | iol) != tpm_inf.base) {
+			dev_err(&pci_dev->dev,
+				"Could not set IO-ports to %04x\n",
+				tpm_inf.base);
+			pci_disable_device(pci_dev);
+			return -EIO;
 		}
 
 		/* activate register */
-		outb(TPM_DAR, TPM_ADDR);
-		outb(0x01, TPM_DATA);
-		outb(DISABLE_REGISTER_PAIR, TPM_ADDR);
+		outb(TPM_DAR, TPM_INF_ADDR);
+		outb(0x01, TPM_INF_DATA);
+		outb(DISABLE_REGISTER_PAIR, TPM_INF_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: "
+			 "config base 0x%x, "
 			 "io base 0x%x, "
 			 "chip version %02x%02x, "
 			 "vendor id %x%x (Infineon), "
 			 "product id %02x%02x"
 			 "%s\n",
+			 TPM_INF_ADDR,
 			 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)" : "");
+			 productid[0], productid[1], chipname);
 
 		rc = tpm_register_hardware(pci_dev, &tpm_inf);
 		if (rc < 0) {
@@ -462,6 +528,6 @@ 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_DESCRIPTION("Driver for Infineon TPM SLD 9630 TT 1.1 / SLB 9635 TT 1.2");
+MODULE_VERSION("1.5");
 MODULE_LICENSE("GPL");