summaryrefslogtreecommitdiffstats
path: root/drivers/char
diff options
context:
space:
mode:
authorJason Gunthorpe <jgunthorpe@obsidianresearch.com>2016-07-12 11:41:50 -0600
committerJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>2016-07-19 17:43:38 +0300
commit82cc1a49b6358394938e759dc4c22b2be773bbad (patch)
tree14ab5cfb49ade347724792326dc35a5ad151f617 /drivers/char
parentcae8b441fc20812d7260dc3b45e05ee98fcfff1b (diff)
downloadlinux-stable-82cc1a49b6358394938e759dc4c22b2be773bbad.tar.gz
linux-stable-82cc1a49b6358394938e759dc4c22b2be773bbad.tar.bz2
linux-stable-82cc1a49b6358394938e759dc4c22b2be773bbad.zip
tpm: Add TPM 2.0 support to the Nuvoton i2c driver (NPCT6xx family)
The command flow is exactly the same, the core simply needs to be told to enable TPM2 mode when the compatible string indicates a TPM2. Signed-off-by: Andrew Azmansky <andrew.zamansky@nuvoton.com> Tested-by: Andrew Zamansky <andrew.zamansky@nuvoton.com> Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Acked-by: Rob Herring <robh@kernel.org> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Diffstat (limited to 'drivers/char')
-rw-r--r--drivers/char/tpm/tpm_i2c_nuvoton.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/drivers/char/tpm/tpm_i2c_nuvoton.c b/drivers/char/tpm/tpm_i2c_nuvoton.c
index 6e404e0211dd..e3a9155ee671 100644
--- a/drivers/char/tpm/tpm_i2c_nuvoton.c
+++ b/drivers/char/tpm/tpm_i2c_nuvoton.c
@@ -1,5 +1,5 @@
-/******************************************************************************
- * Nuvoton TPM I2C Device Driver Interface for WPCT301/NPCT501,
+ /******************************************************************************
+ * Nuvoton TPM I2C Device Driver Interface for WPCT301/NPCT501/NPCT6XX,
* based on the TCG TPM Interface Spec version 1.2.
* Specifications at www.trustedcomputinggroup.org
*
@@ -31,6 +31,7 @@
#include <linux/interrupt.h>
#include <linux/wait.h>
#include <linux/i2c.h>
+#include <linux/of_device.h>
#include "tpm.h"
/* I2C interface offsets */
@@ -52,7 +53,8 @@
#define TPM_I2C_RETRY_DELAY_SHORT 2 /* msec */
#define TPM_I2C_RETRY_DELAY_LONG 10 /* msec */
-#define I2C_DRIVER_NAME "tpm_i2c_nuvoton"
+#define OF_IS_TPM2 ((void *)1)
+#define I2C_IS_TPM2 1
struct priv_data {
int irq;
@@ -165,7 +167,7 @@ static int i2c_nuvoton_get_burstcount(struct i2c_client *client,
}
/*
- * WPCT301/NPCT501 SINT# supports only dataAvail
+ * WPCT301/NPCT501/NPCT6XX SINT# supports only dataAvail
* any call to this function which is not waiting for dataAvail will
* set queue to NULL to avoid waiting for interrupt
*/
@@ -545,6 +547,16 @@ static int i2c_nuvoton_probe(struct i2c_client *client,
if (!priv)
return -ENOMEM;
+ if (dev->of_node) {
+ const struct of_device_id *of_id;
+
+ of_id = of_match_device(dev->driver->of_match_table, dev);
+ if (of_id && of_id->data == OF_IS_TPM2)
+ chip->flags |= TPM_CHIP_FLAG_TPM2;
+ } else
+ if (id->driver_data == I2C_IS_TPM2)
+ chip->flags |= TPM_CHIP_FLAG_TPM2;
+
init_waitqueue_head(&priv->read_queue);
/* Default timeouts */
@@ -620,7 +632,8 @@ static int i2c_nuvoton_remove(struct i2c_client *client)
}
static const struct i2c_device_id i2c_nuvoton_id[] = {
- {I2C_DRIVER_NAME, 0},
+ {"tpm_i2c_nuvoton"},
+ {"tpm2_i2c_nuvoton", .driver_data = I2C_IS_TPM2},
{}
};
MODULE_DEVICE_TABLE(i2c, i2c_nuvoton_id);
@@ -629,6 +642,7 @@ MODULE_DEVICE_TABLE(i2c, i2c_nuvoton_id);
static const struct of_device_id i2c_nuvoton_of_match[] = {
{.compatible = "nuvoton,npct501"},
{.compatible = "winbond,wpct301"},
+ {.compatible = "nuvoton,npct601", .data = OF_IS_TPM2},
{},
};
MODULE_DEVICE_TABLE(of, i2c_nuvoton_of_match);
@@ -641,7 +655,7 @@ static struct i2c_driver i2c_nuvoton_driver = {
.probe = i2c_nuvoton_probe,
.remove = i2c_nuvoton_remove,
.driver = {
- .name = I2C_DRIVER_NAME,
+ .name = "tpm_i2c_nuvoton",
.pm = &i2c_nuvoton_pm_ops,
.of_match_table = of_match_ptr(i2c_nuvoton_of_match),
},