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/*

 * 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