[mirror_ubuntu-artful-kernel.git] / drivers / char / tpm / tpm_tis.c

/*
 * Copyright (C) 2005, 2006 IBM Corporation
 * Copyright (C) 2014, 2015 Intel Corporation
 *
 * Authors:
 * Leendert van Doorn <leendert@watson.ibm.com>
 * Kylene Hall <kjhall@us.ibm.com>
 *
 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
 *
 * 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 <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pnp.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/acpi.h>
#include <linux/freezer.h>
#include <linux/of.h>
#include <linux/of_device.h>
#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);
}

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,
			       u8 *value)
{
	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);

	while (len--)
		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);

	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_WORKAROUND;

	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;
}

#ifdef CONFIG_OF
static const struct of_device_id tis_of_platform_match[] = {
	{.compatible = "tcg,tpm-tis-mmio"},
	{},
};
MODULE_DEVICE_TABLE(of, tis_of_platform_match);
#endif

static struct platform_driver tis_drv = {
	.probe = tpm_tis_plat_probe,
	.remove = tpm_tis_plat_remove,
	.driver = {
		.name		= "tpm_tis",
		.pm		= &tpm_tis_pm,
		.of_match_table = of_match_ptr(tis_of_platform_match),
	},
};

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");
Commit	Line	Data
27084efe LD	1	/*
27084efe LD	2	* Copyright (C) 2005, 2006 IBM Corporation
399235dc	3	* Copyright (C) 2014, 2015 Intel Corporation
27084efe LD	4	*
	5	* Authors:
	6	* Leendert van Doorn <leendert@watson.ibm.com>
	7	* Kylene Hall <kjhall@us.ibm.com>
	8	*
8e81cc13 KY	9	* Maintained by: <tpmdd-devel@lists.sourceforge.net>
8e81cc13 KY	10	*
27084efe LD	11	* Device driver for TCG/TCPA TPM (trusted platform module).
	12	* Specifications at www.trustedcomputinggroup.org
	13	*
	14	* This device driver implements the TPM interface as defined in
	15	* the TCG TPM Interface Spec version 1.2, revision 1.0.
	16	*
	17	* This program is free software; you can redistribute it and/or
	18	* modify it under the terms of the GNU General Public License as
	19	* published by the Free Software Foundation, version 2 of the
	20	* License.
	21	*/
57135568 KJH	22	#include <linux/init.h>
	23	#include <linux/module.h>
	24	#include <linux/moduleparam.h>
27084efe	25	#include <linux/pnp.h>
5a0e3ad6	26	#include <linux/slab.h>
27084efe LD	27	#include <linux/interrupt.h>
27084efe LD	28	#include <linux/wait.h>
3f0d3d01	29	#include <linux/acpi.h>
20b87bbf	30	#include <linux/freezer.h>
420d4398 JG	31	#include <linux/of.h>
420d4398 JG	32	#include <linux/of_device.h>
27084efe	33	#include "tpm.h"
57dacc2b	34	#include "tpm_tis_core.h"
27084efe	35
399235dc	36	struct tpm_info {
51dd43df	37	struct resource res;
ef7b81dc JG	38	/* irq > 0 means: use irq $irq;
	39	* irq = 0 means: autoprobe for an irq;
	40	* irq = -1 means: no irq support
	41	*/
	42	int irq;
399235dc JS	43	};
399235dc JS	44
57dacc2b CR	45	struct tpm_tis_tcg_phy {
57dacc2b CR	46	struct tpm_tis_data priv;
4eea703c	47	void __iomem *iobase;
448e9c55 SD	48	};
448e9c55 SD	49
57dacc2b CR	50	static inline struct tpm_tis_tcg_phy to_tpm_tis_tcg_phy(struct tpm_tis_data data)
	51	{
	52	return container_of(data, struct tpm_tis_tcg_phy, priv);
	53	}
	54
41a5e1cf CR	55	static bool interrupts = true;
	56	module_param(interrupts, bool, 0444);
	57	MODULE_PARM_DESC(interrupts, "Enable interrupts");
	58
	59	static bool itpm;
	60	module_param(itpm, bool, 0444);
	61	MODULE_PARM_DESC(itpm, "Force iTPM workarounds (found on some Lenovo laptops)");
	62
	63	static bool force;
	64	#ifdef CONFIG_X86
	65	module_param(force, bool, 0444);
	66	MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
	67	#endif
	68
1560ffe6	69	#if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
399235dc	70	static int has_hid(struct acpi_device dev, const char hid)
3f0d3d01	71	{
3f0d3d01 MG	72	struct acpi_hardware_id *id;
3f0d3d01 MG	73
399235dc JS	74	list_for_each_entry(id, &dev->pnp.ids, list)
399235dc JS	75	if (!strcmp(hid, id->id))
3f0d3d01	76	return 1;
3f0d3d01 MG	77
	78	return 0;
	79	}
399235dc JS	80
	81	static inline int is_itpm(struct acpi_device *dev)
	82	{
	83	return has_hid(dev, "INTC0102");
	84	}
1560ffe6	85	#else
399235dc	86	static inline int is_itpm(struct acpi_device *dev)
1560ffe6 RD	87	{
	88	return 0;
	89	}
3f0d3d01 MG	90	#endif
3f0d3d01 MG	91
1107d065 CR	92	static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
	93	u8 *result)
	94	{
	95	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	96
	97	while (len--)
	98	*result++ = ioread8(phy->iobase + addr);
	99	return 0;
	100	}
	101
	102	static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
	103	u8 *value)
	104	{
	105	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	106
	107	while (len--)
	108	iowrite8(*value++, phy->iobase + addr);
	109	return 0;
	110	}
	111
	112	static int tpm_tcg_read16(struct tpm_tis_data data, u32 addr, u16 result)
	113	{
	114	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	115
	116	*result = ioread16(phy->iobase + addr);
	117	return 0;
	118	}
	119
	120	static int tpm_tcg_read32(struct tpm_tis_data data, u32 addr, u32 result)
	121	{
	122	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	123
	124	*result = ioread32(phy->iobase + addr);
	125	return 0;
	126	}
	127
	128	static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
	129	{
	130	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	131
	132	iowrite32(value, phy->iobase + addr);
	133	return 0;
	134	}
	135
	136	static const struct tpm_tis_phy_ops tpm_tcg = {
	137	.read_bytes = tpm_tcg_read_bytes,
	138	.write_bytes = tpm_tcg_write_bytes,
	139	.read16 = tpm_tcg_read16,
	140	.read32 = tpm_tcg_read32,
	141	.write32 = tpm_tcg_write32,
	142	};
	143
399235dc JS	144	static int tpm_tis_init(struct device dev, struct tpm_info tpm_info,
399235dc JS	145	acpi_handle acpi_dev_handle)
27084efe	146	{
57dacc2b	147	struct tpm_tis_tcg_phy *phy;
41a5e1cf	148	int irq = -1;
27084efe	149
57dacc2b CR	150	phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL);
57dacc2b CR	151	if (phy == NULL)
448e9c55	152	return -ENOMEM;
afb5abc2	153
57dacc2b CR	154	phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
	155	if (IS_ERR(phy->iobase))
	156	return PTR_ERR(phy->iobase);
27084efe	157
41a5e1cf CR	158	if (interrupts)
41a5e1cf CR	159	irq = tpm_info->irq;
9519de3f	160
3507d612	161	if (itpm)
1d70fe9d	162	phy->priv.flags \|= TPM_TIS_ITPM_WORKAROUND;
25112048	163
41a5e1cf CR	164	return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
41a5e1cf CR	165	acpi_dev_handle);
27084efe	166	}
96854310	167
a2fa3fb0 SK	168	static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
a2fa3fb0 SK	169
afc6d369	170	static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
ef7b81dc	171	const struct pnp_device_id *pnp_id)
9e323d3e	172	{
ef7b81dc	173	struct tpm_info tpm_info = {};
0dc55365	174	acpi_handle acpi_dev_handle = NULL;
51dd43df	175	struct resource *res;
7917ff9a	176
51dd43df JG	177	res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
	178	if (!res)
	179	return -ENODEV;
	180	tpm_info.res = *res;
9e323d3e	181
7917ff9a	182	if (pnp_irq_valid(pnp_dev, 0))
399235dc	183	tpm_info.irq = pnp_irq(pnp_dev, 0);
7917ff9a	184	else
ef7b81dc	185	tpm_info.irq = -1;
7917ff9a	186
399235dc JS	187	if (pnp_acpi_device(pnp_dev)) {
	188	if (is_itpm(pnp_acpi_device(pnp_dev)))
	189	itpm = true;
	190
00194826	191	acpi_dev_handle = ACPI_HANDLE(&pnp_dev->dev);
399235dc	192	}
0dc55365	193
399235dc	194	return tpm_tis_init(&pnp_dev->dev, &tpm_info, acpi_dev_handle);
9e323d3e KJH	195	}
9e323d3e KJH	196
0bbed20e	197	static struct pnp_device_id tpm_pnp_tbl[] = {
27084efe	198	{"PNP0C31", 0}, /* TPM */
93e1b7d4 KJH	199	{"ATM1200", 0}, /* Atmel */
	200	{"IFX0102", 0}, /* Infineon */
	201	{"BCM0101", 0}, /* Broadcom */
061991ec	202	{"BCM0102", 0}, /* Broadcom */
93e1b7d4	203	{"NSC1200", 0}, /* National */
fb0e7e11	204	{"ICO0102", 0}, /* Intel */
93e1b7d4 KJH	205	/* Add new here */
	206	{"", 0}, /* User Specified */
	207	{"", 0} /* Terminator */
27084efe	208	};
31bde71c	209	MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
27084efe	210
39af33fc	211	static void tpm_tis_pnp_remove(struct pnp_dev *dev)
253115b7 RA	212	{
253115b7 RA	213	struct tpm_chip *chip = pnp_get_drvdata(dev);
399235dc	214
afb5abc2 JS	215	tpm_chip_unregister(chip);
afb5abc2 JS	216	tpm_tis_remove(chip);
253115b7 RA	217	}
253115b7 RA	218
27084efe LD	219	static struct pnp_driver tis_pnp_driver = {
	220	.name = "tpm_tis",
	221	.id_table = tpm_pnp_tbl,
	222	.probe = tpm_tis_pnp_init,
253115b7	223	.remove = tpm_tis_pnp_remove,
a2fa3fb0 SK	224	.driver = {
	225	.pm = &tpm_tis_pm,
	226	},
27084efe LD	227	};
27084efe LD	228
93e1b7d4 KJH	229	#define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
	230	module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
	231	sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
	232	MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
7a192ec3	233
399235dc JS	234	#ifdef CONFIG_ACPI
	235	static int tpm_check_resource(struct acpi_resource ares, void data)
	236	{
	237	struct tpm_info tpm_info = (struct tpm_info ) data;
	238	struct resource res;
	239
51dd43df	240	if (acpi_dev_resource_interrupt(ares, 0, &res))
399235dc	241	tpm_info->irq = res.start;
30f9c8c9	242	else if (acpi_dev_resource_memory(ares, &res)) {
51dd43df	243	tpm_info->res = res;
30f9c8c9 JS	244	tpm_info->res.name = NULL;
30f9c8c9 JS	245	}
399235dc JS	246
	247	return 1;
	248	}
	249
	250	static int tpm_tis_acpi_init(struct acpi_device *acpi_dev)
	251	{
4d627e67 JG	252	struct acpi_table_tpm2 *tbl;
4d627e67 JG	253	acpi_status st;
399235dc	254	struct list_head resources;
4d627e67	255	struct tpm_info tpm_info = {};
399235dc JS	256	int ret;
399235dc JS	257
4d627e67 JG	258	st = acpi_get_table(ACPI_SIG_TPM2, 1,
	259	(struct acpi_table_header **) &tbl);
	260	if (ACPI_FAILURE(st) \|\| tbl->header.length < sizeof(*tbl)) {
	261	dev_err(&acpi_dev->dev,
	262	FW_BUG "failed to get TPM2 ACPI table\n");
	263	return -EINVAL;
	264	}
	265
	266	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
399235dc JS	267	return -ENODEV;
	268
	269	INIT_LIST_HEAD(&resources);
ef7b81dc	270	tpm_info.irq = -1;
399235dc JS	271	ret = acpi_dev_get_resources(acpi_dev, &resources, tpm_check_resource,
	272	&tpm_info);
	273	if (ret < 0)
	274	return ret;
	275
	276	acpi_dev_free_resource_list(&resources);
	277
51dd43df	278	if (resource_type(&tpm_info.res) != IORESOURCE_MEM) {
4d627e67 JG	279	dev_err(&acpi_dev->dev,
	280	FW_BUG "TPM2 ACPI table does not define a memory resource\n");
	281	return -EINVAL;
	282	}
	283
399235dc JS	284	if (is_itpm(acpi_dev))
	285	itpm = true;
	286
	287	return tpm_tis_init(&acpi_dev->dev, &tpm_info, acpi_dev->handle);
	288	}
	289
	290	static int tpm_tis_acpi_remove(struct acpi_device *dev)
	291	{
	292	struct tpm_chip *chip = dev_get_drvdata(&dev->dev);
	293
	294	tpm_chip_unregister(chip);
	295	tpm_tis_remove(chip);
	296
	297	return 0;
	298	}
	299
	300	static struct acpi_device_id tpm_acpi_tbl[] = {
	301	{"MSFT0101", 0}, /* TPM 2.0 */
	302	/* Add new here */
	303	{"", 0}, /* User Specified */
	304	{"", 0} /* Terminator */
	305	};
	306	MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);
	307
	308	static struct acpi_driver tis_acpi_driver = {
	309	.name = "tpm_tis",
	310	.ids = tpm_acpi_tbl,
	311	.ops = {
	312	.add = tpm_tis_acpi_init,
	313	.remove = tpm_tis_acpi_remove,
	314	},
	315	.drv = {
	316	.pm = &tpm_tis_pm,
	317	},
	318	};
	319	#endif
	320
00194826 JG	321	static struct platform_device *force_pdev;
	322
	323	static int tpm_tis_plat_probe(struct platform_device *pdev)
	324	{
	325	struct tpm_info tpm_info = {};
	326	struct resource *res;
	327
	328	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	329	if (res == NULL) {
	330	dev_err(&pdev->dev, "no memory resource defined\n");
	331	return -ENODEV;
	332	}
	333	tpm_info.res = *res;
	334
	335	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	336	if (res) {
	337	tpm_info.irq = res->start;
	338	} else {
	339	if (pdev == force_pdev)
	340	tpm_info.irq = -1;
	341	else
	342	/* When forcing auto probe the IRQ */
	343	tpm_info.irq = 0;
	344	}
	345
	346	return tpm_tis_init(&pdev->dev, &tpm_info, NULL);
	347	}
	348
	349	static int tpm_tis_plat_remove(struct platform_device *pdev)
	350	{
	351	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
	352
	353	tpm_chip_unregister(chip);
	354	tpm_tis_remove(chip);
	355
	356	return 0;
	357	}
	358
420d4398 JG	359	#ifdef CONFIG_OF
	360	static const struct of_device_id tis_of_platform_match[] = {
	361	{.compatible = "tcg,tpm-tis-mmio"},
	362	{},
	363	};
	364	MODULE_DEVICE_TABLE(of, tis_of_platform_match);
	365	#endif
	366
7a192ec3	367	static struct platform_driver tis_drv = {
00194826 JG	368	.probe = tpm_tis_plat_probe,
00194826 JG	369	.remove = tpm_tis_plat_remove,
7a192ec3	370	.driver = {
afb5abc2	371	.name = "tpm_tis",
b633f050	372	.pm = &tpm_tis_pm,
420d4398	373	.of_match_table = of_match_ptr(tis_of_platform_match),
7a192ec3	374	},
9e323d3e KJH	375	};
9e323d3e KJH	376
00194826 JG	377	static int tpm_tis_force_device(void)
	378	{
	379	struct platform_device *pdev;
	380	static const struct resource x86_resources[] = {
	381	{
	382	.start = 0xFED40000,
	383	.end = 0xFED40000 + TIS_MEM_LEN - 1,
	384	.flags = IORESOURCE_MEM,
	385	},
	386	};
	387
	388	if (!force)
	389	return 0;
	390
	391	/* The driver core will match the name tpm_tis of the device to
	392	* the tpm_tis platform driver and complete the setup via
	393	* tpm_tis_plat_probe
	394	*/
	395	pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
	396	ARRAY_SIZE(x86_resources));
	397	if (IS_ERR(pdev))
	398	return PTR_ERR(pdev);
	399	force_pdev = pdev;
	400
	401	return 0;
	402	}
	403
27084efe LD	404	static int __init init_tis(void)
27084efe LD	405	{
9e323d3e	406	int rc;
00194826 JG	407
	408	rc = tpm_tis_force_device();
	409	if (rc)
	410	goto err_force;
	411
	412	rc = platform_driver_register(&tis_drv);
	413	if (rc)
	414	goto err_platform;
	415
399235dc	416	#ifdef CONFIG_ACPI
00194826 JG	417	rc = acpi_bus_register_driver(&tis_acpi_driver);
	418	if (rc)
	419	goto err_acpi;
399235dc	420	#endif
9e323d3e	421
00194826 JG	422	if (IS_ENABLED(CONFIG_PNP)) {
	423	rc = pnp_register_driver(&tis_pnp_driver);
	424	if (rc)
	425	goto err_pnp;
9e323d3e	426	}
00194826	427
4fba3c3b	428	return 0;
00194826 JG	429
	430	err_pnp:
	431	#ifdef CONFIG_ACPI
	432	acpi_bus_unregister_driver(&tis_acpi_driver);
	433	err_acpi:
	434	#endif
5939eaf4	435	platform_driver_unregister(&tis_drv);
00194826 JG	436	err_platform:
	437	if (force_pdev)
	438	platform_device_unregister(force_pdev);
	439	err_force:
7f2ab000	440	return rc;
27084efe LD	441	}
	442
	443	static void __exit cleanup_tis(void)
	444	{
00194826	445	pnp_unregister_driver(&tis_pnp_driver);
399235dc	446	#ifdef CONFIG_ACPI
00194826	447	acpi_bus_unregister_driver(&tis_acpi_driver);
7f2ab000	448	#endif
7f2ab000	449	platform_driver_unregister(&tis_drv);
00194826 JG	450
	451	if (force_pdev)
	452	platform_device_unregister(force_pdev);
27084efe LD	453	}
	454
	455	module_init(init_tis);
	456	module_exit(cleanup_tis);
	457	MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
	458	MODULE_DESCRIPTION("TPM Driver");
	459	MODULE_VERSION("2.0");
	460	MODULE_LICENSE("GPL");