This patch to the Linux kernel add the support of the Intel iTPM
(Integrated TPM, found in the Intel GM45 chipsets) to the tpm_tis
driver.

What is wrong with the iTPM ?

 o It has a non standard ACPI HID so plug and play (PNP) will not work.
 o It returns a wrong TIS status when sending a TPM command.

What does this patch do to the tpm_tis driver ?

 o changes the default paramaters to disable the ACPI plug and play
   (force=1) and the interrupts (interrupts=0)
 o sets the default time out before calling request_locality() during
   the initialisation of the TPM
 o checks if the status is TPM_STS_VALID in tpm_tis_send()
   (not TPM_STS_DATA_EXPECT) which actually makes the TPM driver working

Many thanks to Seiji Munetoh on the mailing list of the Linux TPM driver
(http://sf.net/projects/tpmdd).

--- drivers/char/tpm/tpm_tis.c.orig	2009-02-02 14:42:32.000000000 +0900
+++ drivers/char/tpm/tpm_tis.c	2009-02-02 18:12:12.000000000 +0900
@@ -293,7 +293,7 @@
 		wait_for_stat(chip, TPM_STS_VALID, chip->vendor.timeout_c,
 			      &chip->vendor.int_queue);
 		status = tpm_tis_status(chip);
-		if ((status & TPM_STS_DATA_EXPECT) == 0) {
+		if ((status & TPM_STS_VALID) == 0) {
 			rc = -EIO;
 			goto out_err;
 		}
@@ -430,7 +430,7 @@
 	return IRQ_HANDLED;
 }
 
-static int interrupts = 1;
+static int interrupts = 0;
 module_param(interrupts, bool, 0444);
 MODULE_PARM_DESC(interrupts, "Enable interrupts");
 
@@ -450,19 +450,19 @@
 		goto out_err;
 	}
 
-	if (request_locality(chip, 0) != 0) {
-		rc = -ENODEV;
-		goto out_err;
-	}
-
-	vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
-
 	/* Default timeouts */
 	chip->vendor.timeout_a = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 	chip->vendor.timeout_b = msecs_to_jiffies(TIS_LONG_TIMEOUT);
 	chip->vendor.timeout_c = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 	chip->vendor.timeout_d = msecs_to_jiffies(TIS_SHORT_TIMEOUT);
 
+	if (request_locality(chip, 0) != 0) { 
+		rc = -ENODEV;
+		goto out_err;
+	}
+
+	vendor = ioread32(chip->vendor.iobase + TPM_DID_VID(0));
+
 	dev_info(dev,
 		 "1.2 TPM (device-id 0x%X, rev-id %d)\n",
 		 vendor >> 16, ioread8(chip->vendor.iobase + TPM_RID(0)));
@@ -652,7 +652,7 @@
 
 static struct platform_device *pdev;
 
-static int force;
+static int force = 1;
 module_param(force, bool, 0444);
 MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
 static int __init init_tis(void)