OpenCloudOS-Kernel/drivers/char/tpm/tpm_tis.c

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// SPDX-License-Identifier: GPL-2.0-only
/*
* 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.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/pnp.h>
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
#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 <linux/kernel.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,
const 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 (ARRAY_SIZE(tpm_pnp_tbl) - 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_optional(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");