linux/drivers/char/tpm/tpm_atmel.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2005 IBM Corporation
 *
 * Authors:
 * Kylene Hall <[email protected]>
 *
 * Maintained by: <[email protected]>
 *
 * Device driver for TCG/TCPA TPM (trusted platform module).
 * Specifications at www.trustedcomputinggroup.org
 *
 * 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.
 */

struct tpm_atmel_priv { … };

#ifdef CONFIG_PPC64

#include <linux/of.h>

#define atmel_getb …
#define atmel_putb …
#define atmel_request_region …
#define atmel_release_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) …
#define atmel_putb(val, chip, offset) …
#define atmel_request_region …
#define atmel_release_region …
/* Atmel definitions */
enum tpm_atmel_addr { … };

static inline int tpm_read_index(int base, int index)
{ … }

/* Verify this is a 1.1 Atmel TPM */
static int atmel_verify_tpm11(void)
{ … }

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)
{ … }
#endif