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429 lines
9.5 KiB
429 lines
9.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2005, 2006 IBM Corporation |
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* Copyright (C) 2014, 2015 Intel Corporation |
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* |
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* Authors: |
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* Leendert van Doorn <[email protected]> |
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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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* This device driver implements the TPM interface as defined in |
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* the TCG TPM Interface Spec version 1.2, revision 1.0. |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/pnp.h> |
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#include <linux/slab.h> |
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#include <linux/interrupt.h> |
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#include <linux/wait.h> |
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#include <linux/acpi.h> |
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#include <linux/freezer.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/kernel.h> |
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#include <linux/dmi.h> |
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#include "tpm.h" |
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#include "tpm_tis_core.h" |
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struct tpm_info { |
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struct resource res; |
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/* irq > 0 means: use irq $irq; |
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* irq = 0 means: autoprobe for an irq; |
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* irq = -1 means: no irq support |
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*/ |
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int irq; |
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}; |
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struct tpm_tis_tcg_phy { |
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struct tpm_tis_data priv; |
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void __iomem *iobase; |
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}; |
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static inline struct tpm_tis_tcg_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data) |
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{ |
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return container_of(data, struct tpm_tis_tcg_phy, priv); |
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} |
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static int interrupts = -1; |
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module_param(interrupts, int, 0444); |
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MODULE_PARM_DESC(interrupts, "Enable interrupts"); |
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static bool itpm; |
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module_param(itpm, bool, 0444); |
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MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); |
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static bool force; |
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#ifdef CONFIG_X86 |
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module_param(force, bool, 0444); |
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MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry"); |
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#endif |
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static int tpm_tis_disable_irq(const struct dmi_system_id *d) |
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{ |
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if (interrupts == -1) { |
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pr_notice("tpm_tis: %s detected: disabling interrupts.\n", d->ident); |
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interrupts = 0; |
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} |
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return 0; |
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} |
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static const struct dmi_system_id tpm_tis_dmi_table[] = { |
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{ |
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.callback = tpm_tis_disable_irq, |
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.ident = "ThinkPad T490s", |
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.matches = { |
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), |
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DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T490s"), |
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}, |
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}, |
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{} |
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}; |
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#if defined(CONFIG_PNP) && defined(CONFIG_ACPI) |
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static int has_hid(struct acpi_device *dev, const char *hid) |
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{ |
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struct acpi_hardware_id *id; |
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list_for_each_entry(id, &dev->pnp.ids, list) |
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if (!strcmp(hid, id->id)) |
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return 1; |
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return 0; |
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} |
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static inline int is_itpm(struct acpi_device *dev) |
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{ |
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if (!dev) |
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return 0; |
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return has_hid(dev, "INTC0102"); |
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} |
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#else |
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static inline int is_itpm(struct acpi_device *dev) |
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{ |
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return 0; |
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} |
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#endif |
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#if defined(CONFIG_ACPI) |
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#define DEVICE_IS_TPM2 1 |
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static const struct acpi_device_id tpm_acpi_tbl[] = { |
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{"MSFT0101", DEVICE_IS_TPM2}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl); |
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static int check_acpi_tpm2(struct device *dev) |
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{ |
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const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev); |
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struct acpi_table_tpm2 *tbl; |
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acpi_status st; |
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if (!aid || aid->driver_data != DEVICE_IS_TPM2) |
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return 0; |
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/* If the ACPI TPM2 signature is matched then a global ACPI_SIG_TPM2 |
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* table is mandatory |
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*/ |
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st = |
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acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl); |
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if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) { |
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dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n"); |
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return -EINVAL; |
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} |
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/* The tpm2_crb driver handles this device */ |
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if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED) |
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return -ENODEV; |
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return 0; |
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} |
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#else |
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static int check_acpi_tpm2(struct device *dev) |
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{ |
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return 0; |
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} |
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#endif |
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static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, |
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u8 *result) |
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{ |
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struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); |
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while (len--) |
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*result++ = ioread8(phy->iobase + addr); |
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return 0; |
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} |
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static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, |
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const u8 *value) |
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{ |
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struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); |
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while (len--) |
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iowrite8(*value++, phy->iobase + addr); |
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return 0; |
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} |
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static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result) |
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{ |
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struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); |
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*result = ioread16(phy->iobase + addr); |
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return 0; |
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} |
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static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result) |
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{ |
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struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); |
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*result = ioread32(phy->iobase + addr); |
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return 0; |
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} |
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static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value) |
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{ |
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struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); |
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iowrite32(value, phy->iobase + addr); |
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return 0; |
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} |
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static const struct tpm_tis_phy_ops tpm_tcg = { |
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.read_bytes = tpm_tcg_read_bytes, |
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.write_bytes = tpm_tcg_write_bytes, |
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.read16 = tpm_tcg_read16, |
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.read32 = tpm_tcg_read32, |
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.write32 = tpm_tcg_write32, |
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}; |
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static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info) |
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{ |
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struct tpm_tis_tcg_phy *phy; |
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int irq = -1; |
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int rc; |
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dmi_check_system(tpm_tis_dmi_table); |
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rc = check_acpi_tpm2(dev); |
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if (rc) |
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return rc; |
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phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL); |
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if (phy == NULL) |
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return -ENOMEM; |
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phy->iobase = devm_ioremap_resource(dev, &tpm_info->res); |
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if (IS_ERR(phy->iobase)) |
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return PTR_ERR(phy->iobase); |
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if (interrupts) |
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irq = tpm_info->irq; |
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if (itpm || is_itpm(ACPI_COMPANION(dev))) |
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phy->priv.flags |= TPM_TIS_ITPM_WORKAROUND; |
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return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg, |
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ACPI_HANDLE(dev)); |
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} |
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static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume); |
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static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev, |
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const struct pnp_device_id *pnp_id) |
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{ |
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struct tpm_info tpm_info = {}; |
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struct resource *res; |
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res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0); |
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if (!res) |
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return -ENODEV; |
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tpm_info.res = *res; |
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if (pnp_irq_valid(pnp_dev, 0)) |
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tpm_info.irq = pnp_irq(pnp_dev, 0); |
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else |
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tpm_info.irq = -1; |
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return tpm_tis_init(&pnp_dev->dev, &tpm_info); |
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} |
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/* |
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* There is a known bug caused by 93e1b7d42e1e ("[PATCH] tpm: add HID module |
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* parameter"). This commit added IFX0102 device ID, which is also used by |
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* tpm_infineon but ignored to add quirks to probe which driver ought to be |
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* used. |
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*/ |
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static struct pnp_device_id tpm_pnp_tbl[] = { |
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{"PNP0C31", 0}, /* TPM */ |
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{"ATM1200", 0}, /* Atmel */ |
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{"IFX0102", 0}, /* Infineon */ |
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{"BCM0101", 0}, /* Broadcom */ |
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{"BCM0102", 0}, /* Broadcom */ |
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{"NSC1200", 0}, /* National */ |
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{"ICO0102", 0}, /* Intel */ |
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/* Add new here */ |
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{"", 0}, /* User Specified */ |
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{"", 0} /* Terminator */ |
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}; |
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MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl); |
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static void tpm_tis_pnp_remove(struct pnp_dev *dev) |
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{ |
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struct tpm_chip *chip = pnp_get_drvdata(dev); |
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tpm_chip_unregister(chip); |
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tpm_tis_remove(chip); |
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} |
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static struct pnp_driver tis_pnp_driver = { |
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.name = "tpm_tis", |
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.id_table = tpm_pnp_tbl, |
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.probe = tpm_tis_pnp_init, |
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.remove = tpm_tis_pnp_remove, |
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.driver = { |
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.pm = &tpm_tis_pm, |
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}, |
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}; |
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#define TIS_HID_USR_IDX (ARRAY_SIZE(tpm_pnp_tbl) - 2) |
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module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id, |
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sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444); |
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MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe"); |
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static struct platform_device *force_pdev; |
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static int tpm_tis_plat_probe(struct platform_device *pdev) |
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{ |
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struct tpm_info tpm_info = {}; |
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struct resource *res; |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (res == NULL) { |
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dev_err(&pdev->dev, "no memory resource defined\n"); |
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return -ENODEV; |
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} |
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tpm_info.res = *res; |
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tpm_info.irq = platform_get_irq_optional(pdev, 0); |
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if (tpm_info.irq <= 0) { |
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if (pdev != force_pdev) |
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tpm_info.irq = -1; |
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else |
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/* When forcing auto probe the IRQ */ |
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tpm_info.irq = 0; |
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} |
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return tpm_tis_init(&pdev->dev, &tpm_info); |
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} |
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static int tpm_tis_plat_remove(struct platform_device *pdev) |
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{ |
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struct tpm_chip *chip = dev_get_drvdata(&pdev->dev); |
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tpm_chip_unregister(chip); |
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tpm_tis_remove(chip); |
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return 0; |
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} |
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#ifdef CONFIG_OF |
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static const struct of_device_id tis_of_platform_match[] = { |
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{.compatible = "tcg,tpm-tis-mmio"}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, tis_of_platform_match); |
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#endif |
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static struct platform_driver tis_drv = { |
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.probe = tpm_tis_plat_probe, |
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.remove = tpm_tis_plat_remove, |
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.driver = { |
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.name = "tpm_tis", |
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.pm = &tpm_tis_pm, |
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.of_match_table = of_match_ptr(tis_of_platform_match), |
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.acpi_match_table = ACPI_PTR(tpm_acpi_tbl), |
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}, |
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}; |
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static int tpm_tis_force_device(void) |
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{ |
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struct platform_device *pdev; |
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static const struct resource x86_resources[] = { |
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DEFINE_RES_MEM(0xFED40000, TIS_MEM_LEN) |
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}; |
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if (!force) |
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return 0; |
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/* The driver core will match the name tpm_tis of the device to |
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* the tpm_tis platform driver and complete the setup via |
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* tpm_tis_plat_probe |
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*/ |
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pdev = platform_device_register_simple("tpm_tis", -1, x86_resources, |
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ARRAY_SIZE(x86_resources)); |
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if (IS_ERR(pdev)) |
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return PTR_ERR(pdev); |
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force_pdev = pdev; |
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return 0; |
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} |
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static int __init init_tis(void) |
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{ |
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int rc; |
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rc = tpm_tis_force_device(); |
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if (rc) |
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goto err_force; |
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rc = platform_driver_register(&tis_drv); |
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if (rc) |
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goto err_platform; |
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if (IS_ENABLED(CONFIG_PNP)) { |
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rc = pnp_register_driver(&tis_pnp_driver); |
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if (rc) |
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goto err_pnp; |
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} |
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return 0; |
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err_pnp: |
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platform_driver_unregister(&tis_drv); |
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err_platform: |
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if (force_pdev) |
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platform_device_unregister(force_pdev); |
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err_force: |
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return rc; |
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} |
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static void __exit cleanup_tis(void) |
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{ |
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pnp_unregister_driver(&tis_pnp_driver); |
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platform_driver_unregister(&tis_drv); |
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if (force_pdev) |
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platform_device_unregister(force_pdev); |
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} |
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module_init(init_tis); |
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module_exit(cleanup_tis); |
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MODULE_AUTHOR("Leendert van Doorn ([email protected])"); |
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MODULE_DESCRIPTION("TPM Driver"); |
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MODULE_VERSION("2.0"); |
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MODULE_LICENSE("GPL");
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