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Message-ID: <20121002210453.GA12231@obsidianresearch.com>
Date: Tue, 2 Oct 2012 15:04:53 -0600
From: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To: Kent Yoder <key@...ux.vnet.ibm.com>
Cc: linux-kernel@...r.kernel.org, tpmdd-devel@...ts.sourceforge.net,
devicetree-discuss@...ts.ozlabs.org
Subject: [PATCH v2] TPM: Provide a tpm_tis OF driver
This provides an open firwmare driver binding for tpm_tis. OF
is useful on arches where PNP is not used.
Allow the tpm_tis driver to be selected if OF is compiled in.
Signed-off-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
---
drivers/char/tpm/Kconfig | 2 +-
drivers/char/tpm/tpm_tis.c | 79 +++++++++++++++++++++++++++++++++++--------
2 files changed, 65 insertions(+), 16 deletions(-)
v2 changes:
- Add irq_autoprobe to tpm_tis_init to simplify the logic around
the autoprobe function
- Use platform functions in tis_of_probe_one
- Rename tis_drv to tis_driver to silence MODPOST warnings
- checkpatch cleanups
- Do not attempt to auto-probe the TPM on OF configurations
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index a048199..a346714 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -26,7 +26,7 @@ if TCG_TPM
config TCG_TIS
tristate "TPM Interface Specification 1.2 Interface"
- depends on X86
+ depends on X86 || OF
---help---
If you have a TPM security chip that is compliant with the
TCG TIS 1.2 TPM specification say Yes and it will be accessible
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index c4be351..23c6562 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -27,6 +27,7 @@
#include <linux/wait.h>
#include <linux/acpi.h>
#include <linux/freezer.h>
+#include <linux/of_device.h>
#include "tpm.h"
enum tis_access {
@@ -507,7 +508,7 @@ module_param(interrupts, bool, 0444);
MODULE_PARM_DESC(interrupts, "Enable interrupts");
static int tpm_tis_init(struct device *dev, resource_size_t start,
- resource_size_t len, unsigned int irq)
+ resource_size_t len, int irq, int irq_autoprobe)
{
u32 vendor, intfcaps, intmask;
int rc, i, irq_s, irq_e, probe;
@@ -605,9 +606,12 @@ static int tpm_tis_init(struct device *dev, resource_size_t start,
iowrite32(intmask,
chip->vendor.iobase +
TPM_INT_ENABLE(chip->vendor.locality));
- if (interrupts)
- chip->vendor.irq = irq;
- if (interrupts && !chip->vendor.irq) {
+ if (!interrupts) {
+ irq = 0;
+ irq_autoprobe = 0;
+ }
+ chip->vendor.irq = irq;
+ if (irq == 0 && irq_autoprobe) {
irq_s =
ioread8(chip->vendor.iobase +
TPM_INT_VECTOR(chip->vendor.locality));
@@ -739,13 +743,11 @@ static int __devinit tpm_tis_pnp_init(struct pnp_dev *pnp_dev,
if (pnp_irq_valid(pnp_dev, 0))
irq = pnp_irq(pnp_dev, 0);
- else
- interrupts = 0;
if (is_itpm(pnp_dev))
itpm = 1;
- return tpm_tis_init(&pnp_dev->dev, start, len, irq);
+ return tpm_tis_init(&pnp_dev->dev, start, len, irq, 0);
}
static int tpm_tis_pnp_suspend(struct pnp_dev *dev, pm_message_t msg)
@@ -768,7 +770,7 @@ static int tpm_tis_pnp_resume(struct pnp_dev *dev)
return ret;
}
-static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = {
+static const struct pnp_device_id tpm_pnp_tbl[] __devinitdata = {
{"PNP0C31", 0}, /* TPM */
{"ATM1200", 0}, /* Atmel */
{"IFX0102", 0}, /* Infineon */
@@ -792,7 +794,7 @@ static __devexit void tpm_tis_pnp_remove(struct pnp_dev *dev)
}
-static struct pnp_driver tis_pnp_driver = {
+static const struct pnp_driver tis_pnp_driver = {
.name = "tpm_tis",
.id_table = tpm_pnp_tbl,
.probe = tpm_tis_pnp_init,
@@ -821,12 +823,52 @@ static int tpm_tis_resume(struct device *dev)
static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
-static struct platform_driver tis_drv = {
+#ifdef CONFIG_OF
+static const struct of_device_id tis_of_platform_match[] __devinitdata = {
+ {.compatible = "tcg,tpm_tis"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, tis_of_platform_match);
+
+static int __devinit tis_of_probe_one(struct platform_device *pdev)
+{
+ const struct resource *res;
+ int irq;
+
+ if (!pdev->dev.of_node)
+ return -ENODEV;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq < 0)
+ irq = 0;
+ return tpm_tis_init(&pdev->dev, res->start, res->end - res->start + 1,
+ irq, 0);
+}
+
+static int __devexit tis_of_remove_one(struct platform_device *odev)
+{
+ struct tpm_chip *chip = dev_get_drvdata(&odev->dev);
+ tpm_dev_vendor_release(chip);
+ kfree(chip);
+ return 0;
+}
+#endif
+
+static struct platform_driver tis_driver = {
.driver = {
.name = "tpm_tis",
.owner = THIS_MODULE,
.pm = &tpm_tis_pm,
+ .of_match_table = of_match_ptr(tis_of_platform_match),
},
+#ifdef CONFIG_OF
+ .probe = tis_of_probe_one,
+ .remove = __devexit_p(tis_of_remove_one)
+#endif
};
static struct platform_device *pdev;
@@ -842,15 +884,22 @@ static int __init init_tis(void)
return pnp_register_driver(&tis_pnp_driver);
#endif
- rc = platform_driver_register(&tis_drv);
+ rc = platform_driver_register(&tis_driver);
if (rc < 0)
return rc;
- if (IS_ERR(pdev=platform_device_register_simple("tpm_tis", -1, NULL, 0)))
+ /* TIS_MEM_BASE is only going to work on x86.. */
+#ifndef CONFIG_OF
+ pdev = platform_device_register_simple("tpm_tis", -1, NULL, 0);
+ if (IS_ERR(pdev)) {
+ platform_driver_unregister(&tis_driver);
return PTR_ERR(pdev);
- if((rc=tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0)) != 0) {
+ }
+ rc = tpm_tis_init(&pdev->dev, TIS_MEM_BASE, TIS_MEM_LEN, 0, 1);
+ if (rc != 0) {
platform_device_unregister(pdev);
- platform_driver_unregister(&tis_drv);
+ platform_driver_unregister(&tis_driver);
}
+#endif
return rc;
}
@@ -882,7 +931,7 @@ static void __exit cleanup_tis(void)
}
#endif
platform_device_unregister(pdev);
- platform_driver_unregister(&tis_drv);
+ platform_driver_unregister(&tis_driver);
}
module_init(init_tis);
--
1.7.5.4
--
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