1 files changed, 60 insertions, 3 deletions

diff --git a/drivers/char/tpm/tpm_atmel.c b/drivers/char/tpm/tpm_atmel.c
index 9fb2defa9dc4..54a0360a3c95 100644
--- a/drivers/char/tpm/tpm_atmel.c
+++ b/drivers/char/tpm/tpm_atmel.c
@@ -15,7 +15,66 @@
  */
 
 #include "tpm.h"
-#include "tpm_atmel.h"
+
+struct tpm_atmel_priv {
+	int region_size;
+	int have_region;
+	unsigned long base;
+	void __iomem *iobase;
+};
+
+#define atmel_getb(chip, offset) inb(atmel_get_priv(chip)->base + (offset))
+#define atmel_putb(val, chip, offset) \
+	outb(val, atmel_get_priv(chip)->base + (offset))
+#define atmel_request_region request_region
+#define atmel_release_region release_region
+/* Atmel definitions */
+enum tpm_atmel_addr {
+	TPM_ATMEL_BASE_ADDR_LO = 0x08,
+	TPM_ATMEL_BASE_ADDR_HI = 0x09
+};
+
+static inline int tpm_read_index(int base, int index)
+{
+	outb(index, base);
+	return inb(base + 1) & 0xFF;
+}
+
+/* Verify this is a 1.1 Atmel TPM */
+static int atmel_verify_tpm11(void)
+{
+	/* verify that it is an Atmel part */
+	if (tpm_read_index(TPM_ADDR, 4) != 'A' ||
+	    tpm_read_index(TPM_ADDR, 5) != 'T' ||
+	    tpm_read_index(TPM_ADDR, 6) != 'M' ||
+	    tpm_read_index(TPM_ADDR, 7) != 'L')
+		return 1;
+
+	/* query chip for its version number */
+	if (tpm_read_index(TPM_ADDR, 0x00) != 1 ||
+	    tpm_read_index(TPM_ADDR, 0x01) != 1)
+		return 1;
+
+	/* This is an atmel supported part */
+	return 0;
+}
+
+/* Determine where to talk to device */
+static void __iomem *atmel_get_base_addr(unsigned long *base, int *region_size)
+{
+	int lo, hi;
+
+	if (atmel_verify_tpm11() != 0)
+		return NULL;
+
+	lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO);
+	hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI);
+
+	*base = (hi << 8) | lo;
+	*region_size = 2;
+
+	return ioport_map(*base, *region_size);
+}
 
 /* write status bits */
 enum tpm_atmel_write_status {
@@ -142,7 +201,6 @@ static void atml_plat_remove(void)
 	tpm_chip_unregister(chip);
 	if (priv->have_region)
 		atmel_release_region(priv->base, priv->region_size);
-	atmel_put_base_addr(priv->iobase);
 	platform_device_unregister(pdev);
 }
 
@@ -211,7 +269,6 @@ static int __init init_atmel(void)
 err_unreg_dev:
 	platform_device_unregister(pdev);
 err_rel_reg:
-	atmel_put_base_addr(iobase);
 	if (have_region)
 		atmel_release_region(base,
 				     region_size);