diff options
Diffstat (limited to 'drivers/char/tpm/tpm_atmel.h')
| -rw-r--r-- | drivers/char/tpm/tpm_atmel.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/drivers/char/tpm/tpm_atmel.h b/drivers/char/tpm/tpm_atmel.h new file mode 100644 index 000000000..ba37e77e8 --- /dev/null +++ b/drivers/char/tpm/tpm_atmel.h @@ -0,0 +1,140 @@ +/* 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 |