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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /drivers/char/tpm/tpm_atmel.h
Initial import
Diffstat (limited to 'drivers/char/tpm/tpm_atmel.h')
-rw-r--r--drivers/char/tpm/tpm_atmel.h131
1 files changed, 131 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm_atmel.h b/drivers/char/tpm/tpm_atmel.h
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index 000000000..6c831f946
--- /dev/null
+++ b/drivers/char/tpm/tpm_atmel.h
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2005 IBM Corporation
+ *
+ * Authors:
+ * Kylene Hall <kjhall@us.ibm.com>
+ *
+ * Maintained by: <tpmdd-devel@lists.sourceforge.net>
+ *
+ * Device driver for TCG/TCPA TPM (trusted platform module).
+ * Specifications at www.trustedcomputinggroup.org
+ *
+ * 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.
+ *
+ * These difference are required on power because the device must be
+ * discovered through the device tree and iomap must be used to get
+ * around the need for holes in the io_page_mask. This does not happen
+ * automatically because the tpm is not a normal pci device and lives
+ * under the root node.
+ *
+ */
+
+#ifdef CONFIG_PPC64
+
+#include <asm/prom.h>
+
+#define atmel_getb(chip, offset) readb(chip->vendor->iobase + offset);
+#define atmel_putb(val, chip, offset) writeb(val, chip->vendor->iobase + offset)
+#define atmel_request_region request_mem_region
+#define atmel_release_region release_mem_region
+
+static inline void atmel_put_base_addr(void __iomem *iobase)
+{
+ iounmap(iobase);
+}
+
+static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size)
+{
+ struct device_node *dn;
+ unsigned long address, size;
+ const unsigned int *reg;
+ int reglen;
+ int naddrc;
+ int nsizec;
+
+ dn = of_find_node_by_name(NULL, "tpm");
+
+ if (!dn)
+ return NULL;
+
+ if (!of_device_is_compatible(dn, "AT97SC3201")) {
+ of_node_put(dn);
+ return NULL;
+ }
+
+ reg = of_get_property(dn, "reg", &reglen);
+ naddrc = of_n_addr_cells(dn);
+ nsizec = of_n_size_cells(dn);
+
+ of_node_put(dn);
+
+
+ if (naddrc == 2)
+ address = ((unsigned long) reg[0] << 32) | reg[1];
+ else
+ address = reg[0];
+
+ if (nsizec == 2)
+ size =
+ ((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1];
+ else
+ size = reg[naddrc];
+
+ *base = address;
+ *region_size = size;
+ return ioremap(*base, *region_size);
+}
+#else
+#define atmel_getb(chip, offset) inb(chip->vendor->base + offset)
+#define atmel_putb(val, chip, offset) outb(val, chip->vendor->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
+};
+
+/* 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;
+}
+
+static inline void atmel_put_base_addr(void __iomem *iobase)
+{
+}
+
+/* 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);
+}
+#endif