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140 lines
3.2 KiB
140 lines
3.2 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2005 IBM Corporation |
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* |
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* Authors: |
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* Kylene Hall <[email protected]> |
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* |
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* Maintained by: <[email protected]> |
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* |
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* Device driver for TCG/TCPA TPM (trusted platform module). |
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* Specifications at www.trustedcomputinggroup.org |
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* |
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* These difference are required on power because the device must be |
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* discovered through the device tree and iomap must be used to get |
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* around the need for holes in the io_page_mask. This does not happen |
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* automatically because the tpm is not a normal pci device and lives |
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* under the root node. |
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*/ |
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struct tpm_atmel_priv { |
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int region_size; |
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int have_region; |
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unsigned long base; |
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void __iomem *iobase; |
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}; |
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#ifdef CONFIG_PPC64 |
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#include <asm/prom.h> |
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#define atmel_getb(priv, offset) readb(priv->iobase + offset) |
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#define atmel_putb(val, priv, offset) writeb(val, priv->iobase + offset) |
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#define atmel_request_region request_mem_region |
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#define atmel_release_region release_mem_region |
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static inline void atmel_put_base_addr(void __iomem *iobase) |
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{ |
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iounmap(iobase); |
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} |
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static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size) |
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{ |
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struct device_node *dn; |
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unsigned long address, size; |
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const unsigned int *reg; |
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int reglen; |
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int naddrc; |
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int nsizec; |
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dn = of_find_node_by_name(NULL, "tpm"); |
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if (!dn) |
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return NULL; |
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if (!of_device_is_compatible(dn, "AT97SC3201")) { |
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of_node_put(dn); |
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return NULL; |
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} |
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reg = of_get_property(dn, "reg", ®len); |
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naddrc = of_n_addr_cells(dn); |
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nsizec = of_n_size_cells(dn); |
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of_node_put(dn); |
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if (naddrc == 2) |
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address = ((unsigned long) reg[0] << 32) | reg[1]; |
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else |
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address = reg[0]; |
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if (nsizec == 2) |
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size = |
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((unsigned long) reg[naddrc] << 32) | reg[naddrc + 1]; |
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else |
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size = reg[naddrc]; |
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*base = address; |
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*region_size = size; |
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return ioremap(*base, *region_size); |
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} |
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#else |
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#define atmel_getb(chip, offset) inb(atmel_get_priv(chip)->base + offset) |
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#define atmel_putb(val, chip, offset) \ |
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outb(val, atmel_get_priv(chip)->base + offset) |
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#define atmel_request_region request_region |
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#define atmel_release_region release_region |
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/* Atmel definitions */ |
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enum tpm_atmel_addr { |
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TPM_ATMEL_BASE_ADDR_LO = 0x08, |
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TPM_ATMEL_BASE_ADDR_HI = 0x09 |
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}; |
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static inline int tpm_read_index(int base, int index) |
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{ |
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outb(index, base); |
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return inb(base+1) & 0xFF; |
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} |
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/* Verify this is a 1.1 Atmel TPM */ |
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static int atmel_verify_tpm11(void) |
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{ |
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/* verify that it is an Atmel part */ |
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if (tpm_read_index(TPM_ADDR, 4) != 'A' || |
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tpm_read_index(TPM_ADDR, 5) != 'T' || |
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tpm_read_index(TPM_ADDR, 6) != 'M' || |
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tpm_read_index(TPM_ADDR, 7) != 'L') |
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return 1; |
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/* query chip for its version number */ |
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if (tpm_read_index(TPM_ADDR, 0x00) != 1 || |
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tpm_read_index(TPM_ADDR, 0x01) != 1) |
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return 1; |
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/* This is an atmel supported part */ |
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return 0; |
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} |
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static inline void atmel_put_base_addr(void __iomem *iobase) |
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{ |
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} |
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/* Determine where to talk to device */ |
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static void __iomem * atmel_get_base_addr(unsigned long *base, int *region_size) |
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{ |
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int lo, hi; |
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if (atmel_verify_tpm11() != 0) |
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return NULL; |
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lo = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_LO); |
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hi = tpm_read_index(TPM_ADDR, TPM_ATMEL_BASE_ADDR_HI); |
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*base = (hi << 8) | lo; |
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*region_size = 2; |
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return ioport_map(*base, *region_size); |
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} |
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#endif
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