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tpm: Add TPM 2.0 support to the Nuvoton i2c driver (NPCT6xx family)

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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>
This commit is contained in:
Jason Gunthorpe 2016-07-12 11:41:50 -06:00 committed by Jarkko Sakkinen
parent cae8b441fc
commit 82cc1a49b6
2 changed files with 21 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/devicetree/bindings/i2c/trivial-devices.txt
View File

@ -62,6 +62,7 @@ national,lm80 Serial Interface ACPI-Compatible Microprocessor System Hardware M
national,lm85 Temperature sensor with integrated fan control
national,lm92 ±0.33°C Accurate, 12-Bit + Sign Temperature Sensor and Thermal Window Comparator with Two-Wire Interface
nuvoton,npct501 i2c trusted platform module (TPM)
nuvoton,npct601 i2c trusted platform module (TPM2)
nxp,pca9556 Octal SMBus and I2C registered interface
nxp,pca9557 8-bit I2C-bus and SMBus I/O port with reset
nxp,pcf8563 Real-time clock/calendar

26
drivers/char/tpm/tpm_i2c_nuvoton.c
View File

@ -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),
},