/* * Copyright (C) 2005, 2006 IBM Corporation * Copyright (C) 2014, 2015 Intel Corporation * * Authors: * Leendert van Doorn * Kylene Hall * * Maintained by: * * Device driver for TCG/TCPA TPM (trusted platform module). * Specifications at www.trustedcomputinggroup.org * * This device driver implements the TPM interface as defined in * the TCG TPM Interface Spec version 1.2, revision 1.0. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation, version 2 of the * License. */ #include #include #include #include #include #include #include #include #include #include "tpm.h" #include "tpm_tis_core.h" struct tpm_info { struct resource res; /* irq > 0 means: use irq $irq; * irq = 0 means: autoprobe for an irq; * irq = -1 means: no irq support */ int irq; }; struct tpm_tis_tcg_phy { struct tpm_tis_data priv; void __iomem *iobase; }; static inline struct tpm_tis_tcg_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data) { return container_of(data, struct tpm_tis_tcg_phy, priv); } #ifdef CONFIG_PREEMPT_RT_FULL /* * Flushes previous write operations to chip so that a subsequent * ioread*()s won't stall a cpu. */ static inline void tpm_tis_flush(void __iomem *iobase) { ioread8(iobase + TPM_ACCESS(0)); } #else #define tpm_tis_flush(iobase) do { } while (0) #endif static inline void tpm_tis_iowrite8(u8 b, void __iomem *iobase, u32 addr) { iowrite8(b, iobase + addr); tpm_tis_flush(iobase); } static inline void tpm_tis_iowrite32(u32 b, void __iomem *iobase, u32 addr) { iowrite32(b, iobase + addr); tpm_tis_flush(iobase); } static bool interrupts = true; module_param(interrupts, bool, 0444); MODULE_PARM_DESC(interrupts, "Enable interrupts"); static bool itpm; module_param(itpm, bool, 0444); MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)"); static bool force; #ifdef CONFIG_X86 module_param(force, bool, 0444); MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry"); #endif #if defined(CONFIG_PNP) && defined(CONFIG_ACPI) static int has_hid(struct acpi_device *dev, const char *hid) { struct acpi_hardware_id *id; list_for_each_entry(id, &dev->pnp.ids, list) if (!strcmp(hid, id->id)) return 1; return 0; } static inline int is_itpm(struct acpi_device *dev) { return has_hid(dev, "INTC0102"); } #else static inline int is_itpm(struct acpi_device *dev) { return 0; } #endif static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len, u8 *result) { struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); while (len--) *result++ = ioread8(phy->iobase + addr); return 0; } static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len, const u8 *value) { struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); while (len--) tpm_tis_iowrite8(*value++, phy->iobase, addr); return 0; } static int tpm_tcg_read16(struct tpm_tis_data *data, u32 addr, u16 *result) { struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); *result = ioread16(phy->iobase + addr); return 0; } static int tpm_tcg_read32(struct tpm_tis_data *data, u32 addr, u32 *result) { struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); *result = ioread32(phy->iobase + addr); return 0; } static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value) { struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data); tpm_tis_iowrite32(value, phy->iobase, addr); return 0; } static const struct tpm_tis_phy_ops tpm_tcg = { .read_bytes = tpm_tcg_read_bytes, .write_bytes = tpm_tcg_write_bytes, .read16 = tpm_tcg_read16, .read32 = tpm_tcg_read32, .write32 = tpm_tcg_write32, }; static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, acpi_handle acpi_dev_handle) { struct tpm_tis_tcg_phy *phy; int irq = -1; phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL); if (phy == NULL) return -ENOMEM; phy->iobase = devm_ioremap_resource(dev, &tpm_info->res); if (IS_ERR(phy->iobase)) return PTR_ERR(phy->iobase); if (interrupts) irq = tpm_info->irq; if (itpm) phy->priv.flags |= TPM_TIS_ITPM_POSSIBLE; return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg, acpi_dev_handle); } static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume); static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev, const struct pnp_device_id *pnp_id) { struct tpm_info tpm_info = {}; acpi_handle acpi_dev_handle = NULL; struct resource *res; res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; tpm_info.res = *res; if (pnp_irq_valid(pnp_dev, 0)) tpm_info.irq = pnp_irq(pnp_dev, 0); else tpm_info.irq = -1; if (pnp_acpi_device(pnp_dev)) { if (is_itpm(pnp_acpi_device(pnp_dev))) itpm = true; acpi_dev_handle = ACPI_HANDLE(&pnp_dev->dev); } return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle); } static struct pnp_device_id tpm_pnp_tbl[] = { {"PNP0C31", 0}, /* TPM */ {"ATM1200", 0}, /* Atmel */ {"IFX0102", 0}, /* Infineon */ {"BCM0101", 0}, /* Broadcom */ {"BCM0102", 0}, /* Broadcom */ {"NSC1200", 0}, /* National */ {"ICO0102", 0}, /* Intel */ /* Add new here */ {"", 0}, /* User Specified */ {"", 0} /* Terminator */ }; MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl); static void tpm_tis_pnp_remove(struct pnp_dev *dev) { struct tpm_chip *chip = pnp_get_drvdata(dev); tpm_chip_unregister(chip); tpm_tis_remove(chip); } static struct pnp_driver tis_pnp_driver = { .name = "tpm_tis", .id_table = tpm_pnp_tbl, .probe = tpm_tis_pnp_init, .remove = tpm_tis_pnp_remove, .driver = { .pm = &tpm_tis_pm, }, }; #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2 module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id, sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444); MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe"); #ifdef CONFIG_ACPI static int tpm_check_resource(struct acpi_resource *ares, void *data) { struct tpm_info *tpm_info = (struct tpm_info *) data; struct resource res; if (acpi_dev_resource_interrupt(ares, 0, &res)) tpm_info->irq = res.start; else if (acpi_dev_resource_memory(ares, &res)) { tpm_info->res = res; tpm_info->res.name = NULL; } return 1; } static int tpm_tis_acpi_init(struct acpi_device *acpi_dev) { struct acpi_table_tpm2 *tbl; acpi_status st; struct list_head resources; struct tpm_info tpm_info = {}; int ret; st = acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **) &tbl); if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) { dev_err(&acpi_dev->dev, FW_BUG "failed to get TPM2 ACPI table\n"); return -EINVAL; } if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED) return -ENODEV; INIT_LIST_HEAD(&resources); tpm_info.irq = -1; ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource, &tpm_info); if (ret < 0) return ret; acpi_dev_free_resource_list(&resources); if (resource_type(&tpm_info.res) != IORESOURCE_MEM) { dev_err(&acpi_dev->dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n"); return -EINVAL; } if (is_itpm(acpi_dev)) itpm = true; return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle); } static int tpm_tis_acpi_remove(struct acpi_device *dev) { struct tpm_chip *chip = dev_get_drvdata(&dev->dev); tpm_chip_unregister(chip); tpm_tis_remove(chip); return 0; } static struct acpi_device_id tpm_acpi_tbl[] = { {"MSFT0101", 0}, /* TPM 2.0 */ /* Add new here */ {"", 0}, /* User Specified */ {"", 0} /* Terminator */ }; MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl); static struct acpi_driver tis_acpi_driver = { .name = "tpm_tis", .ids = tpm_acpi_tbl, .ops = { .add = tpm_tis_acpi_init, .remove = tpm_tis_acpi_remove, }, .drv = { .pm = &tpm_tis_pm, }, }; #endif static struct platform_device *force_pdev; static int tpm_tis_plat_probe(struct platform_device *pdev) { struct tpm_info tpm_info = {}; struct resource *res; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (res == NULL) { dev_err(&pdev->dev, "no memory resource defined\n"); return -ENODEV; } tpm_info.res = *res; res = platform_get_resource(pdev, IORESOURCE_IRQ, 0); if (res) { tpm_info.irq = res->start; } else { if (pdev == force_pdev) tpm_info.irq = -1; else /* When forcing auto probe the IRQ */ tpm_info.irq = 0; } return tpm_tis_init(&pdev->dev, &tpm_info, NULL); } static int tpm_tis_plat_remove(struct platform_device *pdev) { struct tpm_chip *chip = dev_get_drvdata(&pdev->dev); tpm_chip_unregister(chip); tpm_tis_remove(chip); return 0; } static struct platform_driver tis_drv = { .probe = tpm_tis_plat_probe, .remove = tpm_tis_plat_remove, .driver = { .name = "tpm_tis", .pm = &tpm_tis_pm, }, }; static int tpm_tis_force_device(void) { struct platform_device *pdev; static const struct resource x86_resources[] = { { .start = 0xFED40000, .end = 0xFED40000 + TIS_MEM_LEN - 1, .flags = IORESOURCE_MEM, }, }; if (!force) return 0; /* The driver core will match the name tpm_tis of the device to * the tpm_tis platform driver and complete the setup via * tpm_tis_plat_probe */ pdev = platform_device_register_simple("tpm_tis", -1, x86_resources, ARRAY_SIZE(x86_resources)); if (IS_ERR(pdev)) return PTR_ERR(pdev); force_pdev = pdev; return 0; } static int __init init_tis(void) { int rc; rc = tpm_tis_force_device(); if (rc) goto err_force; rc = platform_driver_register(&tis_drv); if (rc) goto err_platform; #ifdef CONFIG_ACPI rc = acpi_bus_register_driver(&tis_acpi_driver); if (rc) goto err_acpi; #endif if (IS_ENABLED(CONFIG_PNP)) { rc = pnp_register_driver(&tis_pnp_driver); if (rc) goto err_pnp; } return 0; err_pnp: #ifdef CONFIG_ACPI acpi_bus_unregister_driver(&tis_acpi_driver); err_acpi: #endif platform_driver_unregister(&tis_drv); err_platform: if (force_pdev) platform_device_unregister(force_pdev); err_force: return rc; } static void __exit cleanup_tis(void) { pnp_unregister_driver(&tis_pnp_driver); #ifdef CONFIG_ACPI acpi_bus_unregister_driver(&tis_acpi_driver); #endif platform_driver_unregister(&tis_drv); if (force_pdev) platform_device_unregister(force_pdev); } module_init(init_tis); module_exit(cleanup_tis); MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); MODULE_DESCRIPTION("TPM Driver"); MODULE_VERSION("2.0"); MODULE_LICENSE("GPL");