146 lines
3.4 KiB
C
146 lines
3.4 KiB
C
/*
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
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
|