[linux-2.6-block.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)
{
	if (!dev)
		return 0;
	return has_hid(dev, "INTC0102");
}
#else
static inline int is_itpm(struct acpi_device *dev)
{
	return 0;
}
#endif

#if defined(CONFIG_ACPI)
#define DEVICE_IS_TPM2 1

static const struct acpi_device_id tpm_acpi_tbl[] = {
	{"MSFT0101", DEVICE_IS_TPM2},
	{},
};
MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);

static int check_acpi_tpm2(struct device *dev)
{
	const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev);
	struct acpi_table_tpm2 *tbl;
	acpi_status st;

	if (!aid || aid->driver_data != DEVICE_IS_TPM2)
		return 0;

	/* If the ACPI TPM2 signature is matched then a global ACPI_SIG_TPM2
	 * table is mandatory
	 */
	st =
	    acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
	if (ACPI_FAILURE(st) || tbl->header.length < sizeof(*tbl)) {
		dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
		return -EINVAL;
	}

	/* The tpm2_crb driver handles this device */
	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
		return -ENODEV;

	return 0;
}
#else
static int check_acpi_tpm2(struct 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)
{
	struct tpm_tis_tcg_phy *phy;
	int irq = -1;
	int rc;

	rc = check_acpi_tpm2(dev);
	if (rc)
		return rc;

	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 || is_itpm(ACPI_COMPANION(dev)))
		phy->priv.flags |= TPM_TIS_ITPM_WORKAROUND;

	return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
				 ACPI_HANDLE(dev));
}

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 = {};
	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;

	return tpm_tis_init(&pnp_dev->dev, &tpm_info);
}

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");

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;

	tpm_info.irq = platform_get_irq(pdev, 0);
	if (tpm_info.irq <= 0) {
		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);
}

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),
		.acpi_match_table = ACPI_PTR(tpm_acpi_tbl),
	},
};

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;


	if (IS_ENABLED(CONFIG_PNP)) {
		rc = pnp_register_driver(&tis_pnp_driver);
		if (rc)
			goto err_pnp;
	}

	return 0;

err_pnp:
	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);
	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	{
4cb586a1 JG	83	if (!dev)
4cb586a1 JG	84	return 0;
399235dc JS	85	return has_hid(dev, "INTC0102");
399235dc JS	86	}
1560ffe6	87	#else
399235dc	88	static inline int is_itpm(struct acpi_device *dev)
1560ffe6 RD	89	{
	90	return 0;
	91	}
3f0d3d01 MG	92	#endif
3f0d3d01 MG	93
4cb586a1 JG	94	#if defined(CONFIG_ACPI)
	95	#define DEVICE_IS_TPM2 1
	96
	97	static const struct acpi_device_id tpm_acpi_tbl[] = {
	98	{"MSFT0101", DEVICE_IS_TPM2},
	99	{},
	100	};
	101	MODULE_DEVICE_TABLE(acpi, tpm_acpi_tbl);
	102
	103	static int check_acpi_tpm2(struct device *dev)
	104	{
	105	const struct acpi_device_id *aid = acpi_match_device(tpm_acpi_tbl, dev);
	106	struct acpi_table_tpm2 *tbl;
	107	acpi_status st;
	108
	109	if (!aid \|\| aid->driver_data != DEVICE_IS_TPM2)
	110	return 0;
	111
	112	/* If the ACPI TPM2 signature is matched then a global ACPI_SIG_TPM2
	113	* table is mandatory
	114	*/
	115	st =
	116	acpi_get_table(ACPI_SIG_TPM2, 1, (struct acpi_table_header **)&tbl);
	117	if (ACPI_FAILURE(st) \|\| tbl->header.length < sizeof(*tbl)) {
	118	dev_err(dev, FW_BUG "failed to get TPM2 ACPI table\n");
	119	return -EINVAL;
	120	}
	121
	122	/* The tpm2_crb driver handles this device */
	123	if (tbl->start_method != ACPI_TPM2_MEMORY_MAPPED)
	124	return -ENODEV;
	125
	126	return 0;
	127	}
	128	#else
	129	static int check_acpi_tpm2(struct device *dev)
	130	{
	131	return 0;
	132	}
	133	#endif
	134
1107d065 CR	135	static int tpm_tcg_read_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
	136	u8 *result)
	137	{
	138	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	139
	140	while (len--)
	141	*result++ = ioread8(phy->iobase + addr);
	142	return 0;
	143	}
	144
	145	static int tpm_tcg_write_bytes(struct tpm_tis_data *data, u32 addr, u16 len,
	146	u8 *value)
	147	{
	148	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	149
	150	while (len--)
	151	iowrite8(*value++, phy->iobase + addr);
	152	return 0;
	153	}
	154
	155	static int tpm_tcg_read16(struct tpm_tis_data data, u32 addr, u16 result)
	156	{
	157	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	158
	159	*result = ioread16(phy->iobase + addr);
	160	return 0;
	161	}
	162
	163	static int tpm_tcg_read32(struct tpm_tis_data data, u32 addr, u32 result)
	164	{
	165	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	166
	167	*result = ioread32(phy->iobase + addr);
	168	return 0;
	169	}
	170
	171	static int tpm_tcg_write32(struct tpm_tis_data *data, u32 addr, u32 value)
	172	{
	173	struct tpm_tis_tcg_phy *phy = to_tpm_tis_tcg_phy(data);
	174
	175	iowrite32(value, phy->iobase + addr);
	176	return 0;
	177	}
	178
	179	static const struct tpm_tis_phy_ops tpm_tcg = {
	180	.read_bytes = tpm_tcg_read_bytes,
	181	.write_bytes = tpm_tcg_write_bytes,
	182	.read16 = tpm_tcg_read16,
	183	.read32 = tpm_tcg_read32,
	184	.write32 = tpm_tcg_write32,
	185	};
	186
4cb586a1	187	static int tpm_tis_init(struct device dev, struct tpm_info tpm_info)
27084efe	188	{
57dacc2b	189	struct tpm_tis_tcg_phy *phy;
41a5e1cf	190	int irq = -1;
4cb586a1 JG	191	int rc;
	192
	193	rc = check_acpi_tpm2(dev);
	194	if (rc)
	195	return rc;
27084efe	196
57dacc2b CR	197	phy = devm_kzalloc(dev, sizeof(struct tpm_tis_tcg_phy), GFP_KERNEL);
57dacc2b CR	198	if (phy == NULL)
448e9c55	199	return -ENOMEM;
afb5abc2	200
57dacc2b CR	201	phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
	202	if (IS_ERR(phy->iobase))
	203	return PTR_ERR(phy->iobase);
27084efe	204
41a5e1cf CR	205	if (interrupts)
41a5e1cf CR	206	irq = tpm_info->irq;
9519de3f	207
4cb586a1	208	if (itpm \|\| is_itpm(ACPI_COMPANION(dev)))
1d70fe9d	209	phy->priv.flags \|= TPM_TIS_ITPM_WORKAROUND;
25112048	210
41a5e1cf	211	return tpm_tis_core_init(dev, &phy->priv, irq, &tpm_tcg,
4cb586a1	212	ACPI_HANDLE(dev));
27084efe	213	}
96854310	214
a2fa3fb0 SK	215	static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
a2fa3fb0 SK	216
afc6d369	217	static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
ef7b81dc	218	const struct pnp_device_id *pnp_id)
9e323d3e	219	{
ef7b81dc	220	struct tpm_info tpm_info = {};
51dd43df	221	struct resource *res;
7917ff9a	222
51dd43df JG	223	res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0);
	224	if (!res)
	225	return -ENODEV;
	226	tpm_info.res = *res;
9e323d3e	227
7917ff9a	228	if (pnp_irq_valid(pnp_dev, 0))
399235dc	229	tpm_info.irq = pnp_irq(pnp_dev, 0);
7917ff9a	230	else
ef7b81dc	231	tpm_info.irq = -1;
7917ff9a	232
4cb586a1	233	return tpm_tis_init(&pnp_dev->dev, &tpm_info);
9e323d3e KJH	234	}
9e323d3e KJH	235
0bbed20e	236	static struct pnp_device_id tpm_pnp_tbl[] = {
27084efe	237	{"PNP0C31", 0}, /* TPM */
93e1b7d4 KJH	238	{"ATM1200", 0}, /* Atmel */
	239	{"IFX0102", 0}, /* Infineon */
	240	{"BCM0101", 0}, /* Broadcom */
061991ec	241	{"BCM0102", 0}, /* Broadcom */
93e1b7d4	242	{"NSC1200", 0}, /* National */
fb0e7e11	243	{"ICO0102", 0}, /* Intel */
93e1b7d4 KJH	244	/* Add new here */
	245	{"", 0}, /* User Specified */
	246	{"", 0} /* Terminator */
27084efe	247	};
31bde71c	248	MODULE_DEVICE_TABLE(pnp, tpm_pnp_tbl);
27084efe	249
39af33fc	250	static void tpm_tis_pnp_remove(struct pnp_dev *dev)
253115b7 RA	251	{
253115b7 RA	252	struct tpm_chip *chip = pnp_get_drvdata(dev);
399235dc	253
afb5abc2 JS	254	tpm_chip_unregister(chip);
afb5abc2 JS	255	tpm_tis_remove(chip);
253115b7 RA	256	}
253115b7 RA	257
27084efe LD	258	static struct pnp_driver tis_pnp_driver = {
	259	.name = "tpm_tis",
	260	.id_table = tpm_pnp_tbl,
	261	.probe = tpm_tis_pnp_init,
253115b7	262	.remove = tpm_tis_pnp_remove,
a2fa3fb0 SK	263	.driver = {
	264	.pm = &tpm_tis_pm,
	265	},
27084efe LD	266	};
27084efe LD	267
93e1b7d4 KJH	268	#define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2
	269	module_param_string(hid, tpm_pnp_tbl[TIS_HID_USR_IDX].id,
	270	sizeof(tpm_pnp_tbl[TIS_HID_USR_IDX].id), 0444);
	271	MODULE_PARM_DESC(hid, "Set additional specific HID for this driver to probe");
7a192ec3	272
00194826 JG	273	static struct platform_device *force_pdev;
	274
	275	static int tpm_tis_plat_probe(struct platform_device *pdev)
	276	{
	277	struct tpm_info tpm_info = {};
	278	struct resource *res;
	279
	280	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	281	if (res == NULL) {
	282	dev_err(&pdev->dev, "no memory resource defined\n");
	283	return -ENODEV;
	284	}
	285	tpm_info.res = *res;
	286
fc0e1322 JG	287	tpm_info.irq = platform_get_irq(pdev, 0);
fc0e1322 JG	288	if (tpm_info.irq <= 0) {
d27f81f0	289	if (pdev != force_pdev)
00194826 JG	290	tpm_info.irq = -1;
	291	else
	292	/* When forcing auto probe the IRQ */
	293	tpm_info.irq = 0;
	294	}
	295
4cb586a1	296	return tpm_tis_init(&pdev->dev, &tpm_info);
00194826 JG	297	}
	298
	299	static int tpm_tis_plat_remove(struct platform_device *pdev)
	300	{
	301	struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
	302
	303	tpm_chip_unregister(chip);
	304	tpm_tis_remove(chip);
	305
	306	return 0;
	307	}
	308
420d4398 JG	309	#ifdef CONFIG_OF
	310	static const struct of_device_id tis_of_platform_match[] = {
	311	{.compatible = "tcg,tpm-tis-mmio"},
	312	{},
	313	};
	314	MODULE_DEVICE_TABLE(of, tis_of_platform_match);
	315	#endif
	316
7a192ec3	317	static struct platform_driver tis_drv = {
00194826 JG	318	.probe = tpm_tis_plat_probe,
00194826 JG	319	.remove = tpm_tis_plat_remove,
7a192ec3	320	.driver = {
afb5abc2	321	.name = "tpm_tis",
b633f050	322	.pm = &tpm_tis_pm,
420d4398	323	.of_match_table = of_match_ptr(tis_of_platform_match),
4cb586a1	324	.acpi_match_table = ACPI_PTR(tpm_acpi_tbl),
7a192ec3	325	},
9e323d3e KJH	326	};
9e323d3e KJH	327
00194826 JG	328	static int tpm_tis_force_device(void)
	329	{
	330	struct platform_device *pdev;
	331	static const struct resource x86_resources[] = {
	332	{
	333	.start = 0xFED40000,
	334	.end = 0xFED40000 + TIS_MEM_LEN - 1,
	335	.flags = IORESOURCE_MEM,
	336	},
	337	};
	338
	339	if (!force)
	340	return 0;
	341
	342	/* The driver core will match the name tpm_tis of the device to
	343	* the tpm_tis platform driver and complete the setup via
	344	* tpm_tis_plat_probe
	345	*/
	346	pdev = platform_device_register_simple("tpm_tis", -1, x86_resources,
	347	ARRAY_SIZE(x86_resources));
	348	if (IS_ERR(pdev))
	349	return PTR_ERR(pdev);
	350	force_pdev = pdev;
	351
	352	return 0;
	353	}
	354
27084efe LD	355	static int __init init_tis(void)
27084efe LD	356	{
9e323d3e	357	int rc;
00194826 JG	358
	359	rc = tpm_tis_force_device();
	360	if (rc)
	361	goto err_force;
	362
	363	rc = platform_driver_register(&tis_drv);
	364	if (rc)
	365	goto err_platform;
	366
9e323d3e	367
00194826 JG	368	if (IS_ENABLED(CONFIG_PNP)) {
	369	rc = pnp_register_driver(&tis_pnp_driver);
	370	if (rc)
	371	goto err_pnp;
9e323d3e	372	}
00194826	373
4fba3c3b	374	return 0;
00194826 JG	375
00194826 JG	376	err_pnp:
5939eaf4	377	platform_driver_unregister(&tis_drv);
00194826 JG	378	err_platform:
	379	if (force_pdev)
	380	platform_device_unregister(force_pdev);
	381	err_force:
7f2ab000	382	return rc;
27084efe LD	383	}
	384
	385	static void __exit cleanup_tis(void)
	386	{
00194826	387	pnp_unregister_driver(&tis_pnp_driver);
7f2ab000	388	platform_driver_unregister(&tis_drv);
00194826 JG	389
	390	if (force_pdev)
	391	platform_device_unregister(force_pdev);
27084efe LD	392	}
	393
	394	module_init(init_tis);
	395	module_exit(cleanup_tis);
	396	MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
	397	MODULE_DESCRIPTION("TPM Driver");
	398	MODULE_VERSION("2.0");
	399	MODULE_LICENSE("GPL");