450 lines
10 KiB
C
450 lines
10 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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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 "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 bool interrupts = true;
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module_param(interrupts, bool, 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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#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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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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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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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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acpi_handle acpi_dev_handle)
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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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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)
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phy->priv.flags |= TPM_TIS_ITPM_POSSIBLE;
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return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
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acpi_dev_handle);
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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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acpi_handle acpi_dev_handle = NULL;
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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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if (pnp_acpi_device(pnp_dev)) {
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if (is_itpm(pnp_acpi_device(pnp_dev)))
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itpm = true;
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acpi_dev_handle = ACPI_HANDLE(&pnp_dev->dev);
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}
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return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle);
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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 sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -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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#ifdef CONFIG_ACPI
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static int tpm_check_resource(struct acpi_resource *ares, void *data)
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{
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struct tpm_info *tpm_info = (struct tpm_info *) data;
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struct resource res;
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if (acpi_dev_resource_interrupt(ares, 0, &res))
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tpm_info->irq = res.start;
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else if (acpi_dev_resource_memory(ares, &res)) {
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tpm_info->res = res;
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tpm_info->res.name = NULL;
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}
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return 1;
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}
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static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)
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{
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struct acpi_table_tpm2 *tbl;
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acpi_status st;
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struct list_head resources;
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struct tpm_info tpm_info = {};
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int ret;
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st = acpi_get_table(ACPI_SIG_TPM2, 1,
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(struct acpi_table_header **) &tbl);
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if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
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dev_err(&acpi_dev->dev,
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FW_BUG "failed to get TPM2 ACPI table\n");
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return -EINVAL;
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}
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if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
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return -ENODEV;
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INIT_LIST_HEAD(&resources);
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tpm_info.irq = -1;
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ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource,
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&tpm_info);
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if (ret < 0)
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return ret;
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acpi_dev_free_resource_list(&resources);
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if (resource_type(&tpm_info.res) != IORESOURCE_MEM) {
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dev_err(&acpi_dev->dev,
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FW_BUG "TPM2 ACPI table does not define a memory resource\n");
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return -EINVAL;
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}
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if (is_itpm(acpi_dev))
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itpm = true;
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return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle);
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}
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static int tpm_tis_acpi_remove(struct acpi_device *dev)
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{
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struct tpm_chip *chip = dev_get_drvdata(&dev->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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static struct acpi_device_id tpm_acpi_tbl[] = {
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{"MSFT0101", 0}, /* TPM 2.0 */
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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(acpi, tpm_acpi_tbl);
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static struct acpi_driver tis_acpi_driver = {
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.name = "tpm_tis",
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.ids = tpm_acpi_tbl,
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.ops = {
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.add = tpm_tis_acpi_init,
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.remove = tpm_tis_acpi_remove,
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},
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.drv = {
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.pm = &tpm_tis_pm,
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},
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};
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#endif
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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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res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (res) {
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tpm_info.irq = res->start;
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} else {
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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, NULL);
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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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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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},
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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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{
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.start = 0xFED40000,
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.end = 0xFED40000 + TIS_MEM_LEN - 1,
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.flags = IORESOURCE_MEM,
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},
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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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#ifdef CONFIG_ACPI
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rc = acpi_bus_register_driver(&tis_acpi_driver);
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if (rc)
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goto err_acpi;
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#endif
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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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#ifdef CONFIG_ACPI
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acpi_bus_unregister_driver(&tis_acpi_driver);
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err_acpi:
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#endif
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platform_device_unregister(force_pdev);
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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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#ifdef CONFIG_ACPI
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acpi_bus_unregister_driver(&tis_acpi_driver);
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#endif
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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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