[PATCH] tpm: replace odd LPC init function

Realized the tpm_lpc_init function isn't really necessary.  Replaced it
with vendor specific logic to find out the address the BIOS mapped the TPM
to.  This patch removes the tpm_lpc_init function, enums associated with it
and calls to it.  The patch also implements the replacement functionality.

Signed-off-by: Kylene Hall <kjhall@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/tpm/tpm.c

@@ -35,25 +35,6 @@ enum tpm_const {
 	TPM_NUM_MASK_ENTRIES = TPM_NUM_DEVICES / (8 * sizeof(int))
 };
 
-  /* PCI configuration addresses */
-enum tpm_pci_config_addr {
-	PCI_GEN_PMCON_1 = 0xA0,
-	PCI_GEN1_DEC = 0xE4,
-	PCI_LPC_EN = 0xE6,
-	PCI_GEN2_DEC = 0xEC
-};
-
-enum tpm_config {
-	TPM_LOCK_REG = 0x0D,
-	TPM_INTERUPT_REG = 0x0A,
-	TPM_BASE_ADDR_LO = 0x08,
-	TPM_BASE_ADDR_HI = 0x09,
-	TPM_UNLOCK_VALUE = 0x55,
-	TPM_LOCK_VALUE = 0xAA,
-	TPM_DISABLE_INTERUPT_VALUE = 0x00
-};
-
-
 static LIST_HEAD(tpm_chip_list);
 static DEFINE_SPINLOCK(driver_lock);
 static int dev_mask[TPM_NUM_MASK_ENTRIES];
@@ -68,73 +49,6 @@ static void user_reader_timeout(unsigned long ptr)
 	up(&chip->buffer_mutex);
 }
 
-/*
- * Initialize the LPC bus and enable the TPM ports
- */
-int tpm_lpc_bus_init(struct pci_dev *pci_dev, u16 base)
-{
-	u32 lpcenable, tmp;
-	int is_lpcm = 0;
-
-	switch (pci_dev->vendor) {
-	case PCI_VENDOR_ID_INTEL:
-		switch (pci_dev->device) {
-		case PCI_DEVICE_ID_INTEL_82801CA_12:
-		case PCI_DEVICE_ID_INTEL_82801DB_12:
-			is_lpcm = 1;
-			break;
-		}
-		/* init ICH (enable LPC) */
-		pci_read_config_dword(pci_dev, PCI_GEN1_DEC, &lpcenable);
-		lpcenable |= 0x20000000;
-		pci_write_config_dword(pci_dev, PCI_GEN1_DEC, lpcenable);
-
-		if (is_lpcm) {
-			pci_read_config_dword(pci_dev, PCI_GEN1_DEC,
-					      &lpcenable);
-			if ((lpcenable & 0x20000000) == 0) {
-				dev_err(&pci_dev->dev,
-					"cannot enable LPC\n");
-				return -ENODEV;
-			}
-		}
-
-		/* initialize TPM registers */
-		pci_read_config_dword(pci_dev, PCI_GEN2_DEC, &tmp);
-
-		if (!is_lpcm)
-			tmp = (tmp & 0xFFFF0000) | (base & 0xFFF0);
-		else
-			tmp =
-			    (tmp & 0xFFFF0000) | (base & 0xFFF0) |
-			    0x00000001;
-
-		pci_write_config_dword(pci_dev, PCI_GEN2_DEC, tmp);
-
-		if (is_lpcm) {
-			pci_read_config_dword(pci_dev, PCI_GEN_PMCON_1,
-					      &tmp);
-			tmp |= 0x00000004;	/* enable CLKRUN */
-			pci_write_config_dword(pci_dev, PCI_GEN_PMCON_1,
-					       tmp);
-		}
-		break;
-	case PCI_VENDOR_ID_AMD:
-		/* nothing yet */
-		break;
-	}
-
-	tpm_write_index(TPM_LOCK_REG, TPM_UNLOCK_VALUE);
-	tpm_write_index(TPM_INTERUPT_REG, TPM_DISABLE_INTERUPT_VALUE);
-	tpm_write_index(TPM_BASE_ADDR_LO, base);
-	tpm_write_index(TPM_BASE_ADDR_HI, (base & 0xFF00) >> 8);
-	tpm_write_index(TPM_LOCK_REG, TPM_LOCK_VALUE);
-
-	return 0;
-}
-
-EXPORT_SYMBOL_GPL(tpm_lpc_bus_init);
-
 /*
  * Internal kernel interface to transmit TPM commands
  */
@@ -586,10 +500,6 @@ int tpm_pm_resume(struct pci_dev *pci_dev)
 	if (chip == NULL)
 		return -ENODEV;
 
-	spin_lock(&driver_lock);
-	tpm_lpc_bus_init(pci_dev, chip->vendor->base);
-	spin_unlock(&driver_lock);
-
 	return 0;
 }
 

drivers/char/tpm/tpm.h

@@ -91,8 +91,6 @@ static inline void tpm_write_index(int index, int value)
 	outb(value & 0xFF, TPM_DATA);
 }
 
-extern int tpm_lpc_bus_init(struct pci_dev *, u16);
-
 extern int tpm_register_hardware(struct pci_dev *,
 				 struct tpm_vendor_specific *);
 extern int tpm_open(struct inode *, struct file *);

drivers/char/tpm/tpm_atmel.c

@@ -22,8 +22,9 @@
 #include "tpm.h"
 
 /* Atmel definitions */
-enum tpm_atmel_addr{
+enum tpm_atmel_addr {
-	TPM_ATML_BASE = 0x400
+	TPM_ATMEL_BASE_ADDR_LO = 0x08,
+	TPM_ATMEL_BASE_ADDR_HI = 0x09
 };
 
 /* write status bits */
@@ -148,7 +149,6 @@ static struct tpm_vendor_specific tpm_atmel = {
 	.req_complete_mask = ATML_STATUS_BUSY | ATML_STATUS_DATA_AVAIL,
 	.req_complete_val = ATML_STATUS_DATA_AVAIL,
 	.req_canceled = ATML_STATUS_READY,
-	.base = TPM_ATML_BASE,
 	.attr_group = &atmel_attr_grp,
 	.miscdev = { .fops = &atmel_ops, },
 };
@@ -158,14 +158,16 @@ static int __devinit tpm_atml_init(struct pci_dev *pci_dev,
 {
 	u8 version[4];
 	int rc = 0;
+	int lo, hi;
 
 	if (pci_enable_device(pci_dev))
 		return -EIO;
 
-	if (tpm_lpc_bus_init(pci_dev, TPM_ATML_BASE)) {
+	lo = tpm_read_index( TPM_ATMEL_BASE_ADDR_LO );
-		rc = -ENODEV;
+	hi = tpm_read_index( TPM_ATMEL_BASE_ADDR_HI );
-		goto out_err;
+
-	}
+	tpm_atmel.base = (hi<<8)|lo;
+	dev_dbg( &pci_dev->dev, "Operating with base: 0x%x\n", tpm_atmel.base);
 
 	/* verify that it is an Atmel part */
 	if (tpm_read_index(4) != 'A' || tpm_read_index(5) != 'T'

drivers/char/tpm/tpm_nsc.c

@@ -22,9 +22,13 @@
 #include "tpm.h"
 
 /* National definitions */
-enum tpm_nsc_addr {
+enum tpm_nsc_addr{
 	TPM_NSC_BASE = 0x360,
-	TPM_NSC_IRQ = 0x07
+	TPM_NSC_IRQ = 0x07,
+	TPM_NSC_BASE0_HI = 0x60,
+	TPM_NSC_BASE0_LO = 0x61,
+	TPM_NSC_BASE1_HI = 0x62,
+	TPM_NSC_BASE1_LO = 0x63
 };
 
 enum tpm_nsc_index {
@@ -44,7 +48,7 @@ enum tpm_nsc_status_loc {
 };
 
 /* status bits */
-enum tpm_nsc_status{
+enum tpm_nsc_status {
 	NSC_STATUS_OBF = 0x01,	/* output buffer full */
 	NSC_STATUS_IBF = 0x02,	/* input buffer full */
 	NSC_STATUS_F0 = 0x04,	/* F0 */
@@ -246,7 +250,6 @@ static struct tpm_vendor_specific tpm_nsc = {
 	.req_complete_mask = NSC_STATUS_OBF,
 	.req_complete_val = NSC_STATUS_OBF,
 	.req_canceled = NSC_STATUS_RDY,
-	.base = TPM_NSC_BASE,
 	.attr_group = &nsc_attr_grp,
 	.miscdev = { .fops = &nsc_ops, },
 };
@@ -255,15 +258,16 @@ static int __devinit tpm_nsc_init(struct pci_dev *pci_dev,
 				  const struct pci_device_id *pci_id)
 {
 	int rc = 0;
+	int lo, hi;
+
+	hi = tpm_read_index(TPM_NSC_BASE0_HI);
+	lo = tpm_read_index(TPM_NSC_BASE0_LO);
+
+	tpm_nsc.base = (hi<<8) | lo;
 
 	if (pci_enable_device(pci_dev))
 		return -EIO;
 
-	if (tpm_lpc_bus_init(pci_dev, TPM_NSC_BASE)) {
-		rc = -ENODEV;
-		goto out_err;
-	}
-
 	/* verify that it is a National part (SID) */
 	if (tpm_read_index(NSC_SID_INDEX) != 0xEF) {
 		rc = -ENODEV;