440 lines
9.9 KiB
C
440 lines
9.9 KiB
C
// 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 <leendert@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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*
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* Maintained by: <tpmdd-devel@lists.sourceforge.net>
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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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.callback = tpm_tis_disable_irq,
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.ident = "ThinkStation P360 Tiny",
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.matches = {
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DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
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DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkStation P360 Tiny"),
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},
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},
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{
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.callback = tpm_tis_disable_irq,
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.ident = "ThinkPad L490",
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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 L490"),
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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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int ret = 0;
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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 = 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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ret = -ENODEV;
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acpi_put_table((struct acpi_table_header *)tbl);
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return ret;
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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, enum tpm_tis_io_mode io_mode)
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{
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struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
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__le16 result_le16;
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__le32 result_le32;
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switch (io_mode) {
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case TPM_TIS_PHYS_8:
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while (len--)
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*result++ = ioread8(phy->iobase + addr);
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break;
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case TPM_TIS_PHYS_16:
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result_le16 = cpu_to_le16(ioread16(phy->iobase + addr));
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memcpy(result, &result_le16, sizeof(u16));
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break;
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case TPM_TIS_PHYS_32:
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result_le32 = cpu_to_le32(ioread32(phy->iobase + addr));
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memcpy(result, &result_le32, sizeof(u32));
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break;
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}
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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, enum tpm_tis_io_mode io_mode)
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{
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struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
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switch (io_mode) {
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case TPM_TIS_PHYS_8:
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while (len--)
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iowrite8(*value++, phy->iobase + addr);
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break;
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case TPM_TIS_PHYS_16:
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return -EINVAL;
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case TPM_TIS_PHYS_32:
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iowrite32(le32_to_cpu(*((__le32 *)value)), phy->iobase + addr);
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break;
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}
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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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};
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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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set_bit(TPM_TIS_ITPM_WORKAROUND, &phy->priv.flags);
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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 (leendert@watson.ibm.com)");
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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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