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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* 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
*
* 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 {
int region_size;
int have_region;
unsigned long base;
void __iomem *iobase;
};
#ifdef CONFIG_PPC64
#include <asm/prom.h>
#define atmel_getb(priv, offset) readb(priv->iobase + offset)
#define atmel_putb(val, priv, offset) writeb(val, priv->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", ®len);
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(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;
}
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
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