[v2,3/3] tpm: Add a driver for Loongson TPM device

Message ID	20250212033113.15137-4-zhaoqunqin@loongson.cn (mailing list archive)
State	Superseded
Delegated to:	Herbert Xu
Headers	show Received: from mail.loongson.cn (mail.loongson.cn [114.242.206.163]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 8671E1DEFDD; Wed, 12 Feb 2025 03:32:00 +0000 (UTC) From: Qunqin Zhao <zhaoqunqin@loongson.cn> To: lee@kernel.org, herbert@gondor.apana.org.au, davem@davemloft.net, peterhuewe@gmx.de, jarkko@kernel.org Cc: linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, linux-crypto@vger.kernel.org, jgg@ziepe.ca, linux-integrity@vger.kernel.org, Qunqin Zhao <zhaoqunqin@loongson.cn>, Yinggang Gu <guyinggang@loongson.cn> Subject: [PATCH v2 3/3] tpm: Add a driver for Loongson TPM device Date: Wed, 12 Feb 2025 11:31:13 +0800 Message-Id: <20250212033113.15137-4-zhaoqunqin@loongson.cn> In-Reply-To: <20250212033113.15137-1-zhaoqunqin@loongson.cn> References: <20250212033113.15137-1-zhaoqunqin@loongson.cn> Precedence: bulk MIME-Version: 1.0 Content-Transfer-Encoding: 8bit
Series	Drivers for Loongson security engine \| expand [v2,0/3] Drivers for Loongson security engine [v2,1/3] mfd: Add support for Loongson Security Module [v2,2/3] crypto: loongson - add Loongson RNG driver support [v2,3/3] tpm: Add a driver for Loongson TPM device

Message ID

20250212033113.15137-4-zhaoqunqin@loongson.cn (mailing list archive)

State

Superseded

Delegated to:

Herbert Xu

Headers

From: Qunqin Zhao <zhaoqunqin@loongson.cn>
To: lee@kernel.org,
	herbert@gondor.apana.org.au,
	davem@davemloft.net,
	peterhuewe@gmx.de,
	jarkko@kernel.org
Cc: linux-kernel@vger.kernel.org,
	loongarch@lists.linux.dev,
	linux-crypto@vger.kernel.org,
	jgg@ziepe.ca,
	linux-integrity@vger.kernel.org,
	Qunqin Zhao <zhaoqunqin@loongson.cn>,
	Yinggang Gu <guyinggang@loongson.cn>
Subject: [PATCH v2 3/3] tpm: Add a driver for Loongson TPM device
Date: Wed, 12 Feb 2025 11:31:13 +0800
Message-Id: <20250212033113.15137-4-zhaoqunqin@loongson.cn>
In-Reply-To: <20250212033113.15137-1-zhaoqunqin@loongson.cn>
References: <20250212033113.15137-1-zhaoqunqin@loongson.cn>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

Series

Drivers for Loongson security engine | expand

Commit Message

Qunqin Zhao Feb. 12, 2025, 3:31 a.m. UTC

TPM2.0 is implemented in Loongson security engine. This is the driver
for it.

Co-developed-by: Yinggang Gu <guyinggang@loongson.cn>
Signed-off-by: Yinggang Gu <guyinggang@loongson.cn>
Signed-off-by: Qunqin Zhao <zhaoqunqin@loongson.cn>
---
 MAINTAINERS                 |   1 +
 drivers/char/tpm/Kconfig    |   9 ++++
 drivers/char/tpm/Makefile   |   1 +
 drivers/char/tpm/tpm_lsse.c | 104 ++++++++++++++++++++++++++++++++++++
 4 files changed, 115 insertions(+)
 create mode 100644 drivers/char/tpm/tpm_lsse.c

Comments

Jarkko Sakkinen Feb. 12, 2025, 9:28 p.m. UTC | #1

On Wed, Feb 12, 2025 at 11:31:13AM +0800, Qunqin Zhao wrote:
> TPM2.0 is implemented in Loongson security engine. This is the driver

TPM 2.0 or just TPM2 (either is fine with me). Quick reminder what 
Loongson security engine (I could not know that and it would be nice
to have that in git log).

> for it.
> 
> Co-developed-by: Yinggang Gu <guyinggang@loongson.cn>
> Signed-off-by: Yinggang Gu <guyinggang@loongson.cn>
> Signed-off-by: Qunqin Zhao <zhaoqunqin@loongson.cn>
> ---
>  MAINTAINERS                 |   1 +
>  drivers/char/tpm/Kconfig    |   9 ++++
>  drivers/char/tpm/Makefile   |   1 +
>  drivers/char/tpm/tpm_lsse.c | 104 ++++++++++++++++++++++++++++++++++++
>  4 files changed, 115 insertions(+)
>  create mode 100644 drivers/char/tpm/tpm_lsse.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 6493d58436..6aad0f08ad 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -13484,6 +13484,7 @@ LOONGSON CRYPTO DRIVER
>  M:	Qunqin Zhao <zhaoqunqin@loongson.com>
>  L:	linux-crypto@vger.kernel.org
>  S:	Maintained
> +F:	drivers/char/tpm/tpm_lsse.c
>  F:	drivers/crypto/loongson/
>  
>  LOONGSON-2 APB DMA DRIVER

Probably MAINTAINERS update should be a separate patch.

> diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
> index 0fc9a510e0..56d0417065 100644
> --- a/drivers/char/tpm/Kconfig
> +++ b/drivers/char/tpm/Kconfig
> @@ -225,5 +225,14 @@ config TCG_FTPM_TEE
>  	help
>  	  This driver proxies for firmware TPM running in TEE.
>  
> +config TCG_LSSE
> +	tristate "Loongson TPM Interface"
> +	depends on MFD_LS6000SE
> +	help
> +	  If you want to make Loongson TPM support available, say Yes and
> +	  it will be accessible from within Linux. To compile this
> +	  driver as a module, choose M here; the module will be called
> +	  tpm_lsse.
> +
>  source "drivers/char/tpm/st33zp24/Kconfig"
>  endif # TCG_TPM
> diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
> index 9bb142c752..bf2280352d 100644
> --- a/drivers/char/tpm/Makefile
> +++ b/drivers/char/tpm/Makefile
> @@ -44,3 +44,4 @@ obj-$(CONFIG_TCG_XEN) += xen-tpmfront.o
>  obj-$(CONFIG_TCG_CRB) += tpm_crb.o
>  obj-$(CONFIG_TCG_VTPM_PROXY) += tpm_vtpm_proxy.o
>  obj-$(CONFIG_TCG_FTPM_TEE) += tpm_ftpm_tee.o
> +obj-$(CONFIG_TCG_LSSE) += tpm_lsse.o
> diff --git a/drivers/char/tpm/tpm_lsse.c b/drivers/char/tpm/tpm_lsse.c
> new file mode 100644
> index 0000000000..3fd2d9bac8
> --- /dev/null
> +++ b/drivers/char/tpm/tpm_lsse.c
> @@ -0,0 +1,104 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/* Copyright (c) 2025 Loongson Technology Corporation Limited. */
> +
> +#include <linux/device.h>
> +#include <linux/mfd/ls6000se.h>
> +#include <linux/platform_device.h>
> +#include <linux/wait.h>
> +
> +#include "tpm.h"
> +
> +struct tpm_msg {
> +	u32 cmd;
> +	u32 data_off;
> +	u32 data_len;
> +	u32 info[5];
> +};
> +
> +struct tpm_dev {
> +	struct lsse_ch *se_ch;
> +	struct completion tpm_completion;
> +};
> +
> +static void tpm_complete(struct lsse_ch *ch)
> +{
> +	struct tpm_dev *td = ch->priv;
> +
> +	complete(&td->tpm_completion);
> +}
> +
> +static int tpm_ls_recv(struct tpm_chip *chip, u8 *buf, size_t count)
> +{
> +	struct tpm_dev *td = dev_get_drvdata(&chip->dev);
> +	struct tpm_msg *rmsg;
> +	int sig;
> +
> +	sig = wait_for_completion_interruptible(&td->tpm_completion);
> +	if (sig)
> +		return sig;
> +
> +	rmsg = td->se_ch->rmsg;
> +	memcpy(buf, td->se_ch->data_buffer, rmsg->data_len);
> +
> +	return rmsg->data_len;
> +}
> +
> +static int tpm_ls_send(struct tpm_chip *chip, u8 *buf, size_t count)
> +{
> +	struct tpm_dev *td = dev_get_drvdata(&chip->dev);
> +	struct tpm_msg *smsg = td->se_ch->smsg;
> +
> +	memcpy(td->se_ch->data_buffer, buf, count);
> +	smsg->data_len = count;
> +
> +	return se_send_ch_requeset(td->se_ch);
> +}
> +
> +static const struct tpm_class_ops lsse_tpm_ops = {
> +	.flags = TPM_OPS_AUTO_STARTUP,
> +	.recv = tpm_ls_recv,
> +	.send = tpm_ls_send,
> +};
> +
> +static int lsse_tpm_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct tpm_chip *chip;
> +	struct tpm_msg *smsg;
> +	struct tpm_dev *td;
> +
> +	td = devm_kzalloc(dev, sizeof(struct tpm_dev), GFP_KERNEL);
> +	if (!td)
> +		return -ENOMEM;
> +
> +	init_completion(&td->tpm_completion);
> +	td->se_ch = se_init_ch(dev->parent, SE_CH_TPM, PAGE_SIZE,
> +			       2 * sizeof(struct tpm_msg), td, tpm_complete);
> +	if (!td->se_ch)
> +		return -ENODEV;
> +	smsg = td->se_ch->smsg;
> +	smsg->cmd = SE_CMD_TPM;
> +	smsg->data_off = td->se_ch->off;
> +
> +	chip = tpmm_chip_alloc(dev, &lsse_tpm_ops);
> +	if (IS_ERR(chip))
> +		return PTR_ERR(chip);
> +	chip->flags = TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_IRQ;
> +	dev_set_drvdata(&chip->dev, td);
> +
> +	return tpm_chip_register(chip);
> +}
> +
> +static struct platform_driver lsse_tpm_driver = {
> +	.probe   = lsse_tpm_probe,
> +	.driver  = {
> +		.name  = "ls6000se-tpm",
> +	},
> +};
> +module_platform_driver(lsse_tpm_driver);
> +
> +MODULE_ALIAS("platform:ls6000se-tpm");
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Yinggang Gu <guyinggang@loongson.cn>");
> +MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@loongson.cn>");
> +MODULE_DESCRIPTION("Loongson TPM driver");
> -- 
> 2.43.0
> 

BR, Jarkko

Qunqin Zhao Feb. 13, 2025, 3:56 a.m. UTC | #2

在 2025/2/13 上午5:28, Jarkko Sakkinen 写道:
> On Wed, Feb 12, 2025 at 11:31:13AM +0800, Qunqin Zhao wrote:
>> TPM2.0 is implemented in Loongson security engine. This is the driver
> TPM 2.0 or just TPM2 (either is fine with me). Quick reminder what
> Loongson security engine (I could not know that and it would be nice
> to have that in git log).

Looks like just TPM2 is better.

Some explanations about Loongson security engine will be added to git log.

>
>> for it.
>>
>> Co-developed-by: Yinggang Gu <guyinggang@loongson.cn>
>> Signed-off-by: Yinggang Gu <guyinggang@loongson.cn>
>> Signed-off-by: Qunqin Zhao <zhaoqunqin@loongson.cn>
>> ---
>>   MAINTAINERS                 |   1 +
>>   drivers/char/tpm/Kconfig    |   9 ++++
>>   drivers/char/tpm/Makefile   |   1 +
>>   drivers/char/tpm/tpm_lsse.c | 104 ++++++++++++++++++++++++++++++++++++
>>   4 files changed, 115 insertions(+)
>>   create mode 100644 drivers/char/tpm/tpm_lsse.c
>>
>> diff --git a/MAINTAINERS b/MAINTAINERS
>> index 6493d58436..6aad0f08ad 100644
>> --- a/MAINTAINERS
>> +++ b/MAINTAINERS
>> @@ -13484,6 +13484,7 @@ LOONGSON CRYPTO DRIVER
>>   M:	Qunqin Zhao <zhaoqunqin@loongson.com>
>>   L:	linux-crypto@vger.kernel.org
>>   S:	Maintained
>> +F:	drivers/char/tpm/tpm_lsse.c
>>   F:	drivers/crypto/loongson/
>>   
>>   LOONGSON-2 APB DMA DRIVER
> Probably MAINTAINERS update should be a separate patch.

Some  MAINTAINERS updates are not  separated form the driver patch.  
Like the submit of "drivers/mfd/max7714*".

So it seems whether the updates to MAINTAINERS  are separated or not is OK.

BR, Qunqin.

>> diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
>> index 0fc9a510e0..56d0417065 100644
>> --- a/drivers/char/tpm/Kconfig
>> +++ b/drivers/char/tpm/Kconfig
>> @@ -225,5 +225,14 @@ config TCG_FTPM_TEE
>>   	help
>>   	  This driver proxies for firmware TPM running in TEE.
>>   
>> +config TCG_LSSE
>> +	tristate "Loongson TPM Interface"
>> +	depends on MFD_LS6000SE
>> +	help
>> +	  If you want to make Loongson TPM support available, say Yes and
>> +	  it will be accessible from within Linux. To compile this
>> +	  driver as a module, choose M here; the module will be called
>> +	  tpm_lsse.
>> +
>>   source "drivers/char/tpm/st33zp24/Kconfig"
>>   endif # TCG_TPM
>> diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
>> index 9bb142c752..bf2280352d 100644
>> --- a/drivers/char/tpm/Makefile
>> +++ b/drivers/char/tpm/Makefile
>> @@ -44,3 +44,4 @@ obj-$(CONFIG_TCG_XEN) += xen-tpmfront.o
>>   obj-$(CONFIG_TCG_CRB) += tpm_crb.o
>>   obj-$(CONFIG_TCG_VTPM_PROXY) += tpm_vtpm_proxy.o
>>   obj-$(CONFIG_TCG_FTPM_TEE) += tpm_ftpm_tee.o
>> +obj-$(CONFIG_TCG_LSSE) += tpm_lsse.o
>> diff --git a/drivers/char/tpm/tpm_lsse.c b/drivers/char/tpm/tpm_lsse.c
>> new file mode 100644
>> index 0000000000..3fd2d9bac8
>> --- /dev/null
>> +++ b/drivers/char/tpm/tpm_lsse.c
>> @@ -0,0 +1,104 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/* Copyright (c) 2025 Loongson Technology Corporation Limited. */
>> +
>> +#include <linux/device.h>
>> +#include <linux/mfd/ls6000se.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/wait.h>
>> +
>> +#include "tpm.h"
>> +
>> +struct tpm_msg {
>> +	u32 cmd;
>> +	u32 data_off;
>> +	u32 data_len;
>> +	u32 info[5];
>> +};
>> +
>> +struct tpm_dev {
>> +	struct lsse_ch *se_ch;
>> +	struct completion tpm_completion;
>> +};
>> +
>> +static void tpm_complete(struct lsse_ch *ch)
>> +{
>> +	struct tpm_dev *td = ch->priv;
>> +
>> +	complete(&td->tpm_completion);
>> +}
>> +
>> +static int tpm_ls_recv(struct tpm_chip *chip, u8 *buf, size_t count)
>> +{
>> +	struct tpm_dev *td = dev_get_drvdata(&chip->dev);
>> +	struct tpm_msg *rmsg;
>> +	int sig;
>> +
>> +	sig = wait_for_completion_interruptible(&td->tpm_completion);
>> +	if (sig)
>> +		return sig;
>> +
>> +	rmsg = td->se_ch->rmsg;
>> +	memcpy(buf, td->se_ch->data_buffer, rmsg->data_len);
>> +
>> +	return rmsg->data_len;
>> +}
>> +
>> +static int tpm_ls_send(struct tpm_chip *chip, u8 *buf, size_t count)
>> +{
>> +	struct tpm_dev *td = dev_get_drvdata(&chip->dev);
>> +	struct tpm_msg *smsg = td->se_ch->smsg;
>> +
>> +	memcpy(td->se_ch->data_buffer, buf, count);
>> +	smsg->data_len = count;
>> +
>> +	return se_send_ch_requeset(td->se_ch);
>> +}
>> +
>> +static const struct tpm_class_ops lsse_tpm_ops = {
>> +	.flags = TPM_OPS_AUTO_STARTUP,
>> +	.recv = tpm_ls_recv,
>> +	.send = tpm_ls_send,
>> +};
>> +
>> +static int lsse_tpm_probe(struct platform_device *pdev)
>> +{
>> +	struct device *dev = &pdev->dev;
>> +	struct tpm_chip *chip;
>> +	struct tpm_msg *smsg;
>> +	struct tpm_dev *td;
>> +
>> +	td = devm_kzalloc(dev, sizeof(struct tpm_dev), GFP_KERNEL);
>> +	if (!td)
>> +		return -ENOMEM;
>> +
>> +	init_completion(&td->tpm_completion);
>> +	td->se_ch = se_init_ch(dev->parent, SE_CH_TPM, PAGE_SIZE,
>> +			       2 * sizeof(struct tpm_msg), td, tpm_complete);
>> +	if (!td->se_ch)
>> +		return -ENODEV;
>> +	smsg = td->se_ch->smsg;
>> +	smsg->cmd = SE_CMD_TPM;
>> +	smsg->data_off = td->se_ch->off;
>> +
>> +	chip = tpmm_chip_alloc(dev, &lsse_tpm_ops);
>> +	if (IS_ERR(chip))
>> +		return PTR_ERR(chip);
>> +	chip->flags = TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_IRQ;
>> +	dev_set_drvdata(&chip->dev, td);
>> +
>> +	return tpm_chip_register(chip);
>> +}
>> +
>> +static struct platform_driver lsse_tpm_driver = {
>> +	.probe   = lsse_tpm_probe,
>> +	.driver  = {
>> +		.name  = "ls6000se-tpm",
>> +	},
>> +};
>> +module_platform_driver(lsse_tpm_driver);
>> +
>> +MODULE_ALIAS("platform:ls6000se-tpm");
>> +MODULE_LICENSE("GPL");
>> +MODULE_AUTHOR("Yinggang Gu <guyinggang@loongson.cn>");
>> +MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@loongson.cn>");
>> +MODULE_DESCRIPTION("Loongson TPM driver");
>> -- 
>> 2.43.0
>>
> BR, Jarkko

Jarkko Sakkinen Feb. 13, 2025, 10:10 p.m. UTC | #3

On Thu, Feb 13, 2025 at 11:56:25AM +0800, Qunqin Zhao wrote:
> 
> 在 2025/2/13 上午5:28, Jarkko Sakkinen 写道:
> > On Wed, Feb 12, 2025 at 11:31:13AM +0800, Qunqin Zhao wrote:
> > > TPM2.0 is implemented in Loongson security engine. This is the driver
> > TPM 2.0 or just TPM2 (either is fine with me). Quick reminder what
> > Loongson security engine (I could not know that and it would be nice
> > to have that in git log).
> 
> Looks like just TPM2 is better.

Either is fine :-)

> 
> Some explanations about Loongson security engine will be added to git log.
> 
> > 
> > > for it.
> > > 
> > > Co-developed-by: Yinggang Gu <guyinggang@loongson.cn>
> > > Signed-off-by: Yinggang Gu <guyinggang@loongson.cn>
> > > Signed-off-by: Qunqin Zhao <zhaoqunqin@loongson.cn>
> > > ---
> > >   MAINTAINERS                 |   1 +
> > >   drivers/char/tpm/Kconfig    |   9 ++++
> > >   drivers/char/tpm/Makefile   |   1 +
> > >   drivers/char/tpm/tpm_lsse.c | 104 ++++++++++++++++++++++++++++++++++++
> > >   4 files changed, 115 insertions(+)
> > >   create mode 100644 drivers/char/tpm/tpm_lsse.c
> > > 
> > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > index 6493d58436..6aad0f08ad 100644
> > > --- a/MAINTAINERS
> > > +++ b/MAINTAINERS
> > > @@ -13484,6 +13484,7 @@ LOONGSON CRYPTO DRIVER
> > >   M:	Qunqin Zhao <zhaoqunqin@loongson.com>
> > >   L:	linux-crypto@vger.kernel.org
> > >   S:	Maintained
> > > +F:	drivers/char/tpm/tpm_lsse.c
> > >   F:	drivers/crypto/loongson/
> > >   LOONGSON-2 APB DMA DRIVER
> > Probably MAINTAINERS update should be a separate patch.
> 
> Some  MAINTAINERS updates are not  separated form the driver patch.  Like
> the submit of "drivers/mfd/max7714*".
> 
> So it seems whether the updates to MAINTAINERS  are separated or not is OK.

I'd prefer them separated from code changes. They are separate tasks
per se.

BR, Jarkko

Qunqin Zhao Feb. 14, 2025, 1:12 a.m. UTC | #4

在 2025/2/14 上午6:10, Jarkko Sakkinen 写道:
>>>> for it.
>>>>
>>>> Co-developed-by: Yinggang Gu <guyinggang@loongson.cn>
>>>> Signed-off-by: Yinggang Gu <guyinggang@loongson.cn>
>>>> Signed-off-by: Qunqin Zhao <zhaoqunqin@loongson.cn>
>>>> ---
>>>>    MAINTAINERS                 |   1 +
>>>>    drivers/char/tpm/Kconfig    |   9 ++++
>>>>    drivers/char/tpm/Makefile   |   1 +
>>>>    drivers/char/tpm/tpm_lsse.c | 104 ++++++++++++++++++++++++++++++++++++
>>>>    4 files changed, 115 insertions(+)
>>>>    create mode 100644 drivers/char/tpm/tpm_lsse.c
>>>>
>>>> diff --git a/MAINTAINERS b/MAINTAINERS
>>>> index 6493d58436..6aad0f08ad 100644
>>>> --- a/MAINTAINERS
>>>> +++ b/MAINTAINERS
>>>> @@ -13484,6 +13484,7 @@ LOONGSON CRYPTO DRIVER
>>>>    M:	Qunqin Zhao <zhaoqunqin@loongson.com>
>>>>    L:	linux-crypto@vger.kernel.org
>>>>    S:	Maintained
>>>> +F:	drivers/char/tpm/tpm_lsse.c
>>>>    F:	drivers/crypto/loongson/
>>>>    LOONGSON-2 APB DMA DRIVER
>>> Probably MAINTAINERS update should be a separate patch.
>> Some  MAINTAINERS updates are not  separated form the driver patch.  Like
>> the submit of "drivers/mfd/max7714*".
>>
>> So it seems whether the updates to MAINTAINERS  are separated or not is OK.
> I'd prefer them separated from code changes. They are separate tasks
> per se.

OK, thanks.

BR, Qunqin.

>
> BR, Jarkko

diff --git a/MAINTAINERS b/MAINTAINERS
index 6493d58436..6aad0f08ad 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13484,6 +13484,7 @@  LOONGSON CRYPTO DRIVER
 M:	Qunqin Zhao <zhaoqunqin@loongson.com>
 L:	linux-crypto@vger.kernel.org
 S:	Maintained
+F:	drivers/char/tpm/tpm_lsse.c
 F:	drivers/crypto/loongson/
 
 LOONGSON-2 APB DMA DRIVER
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index 0fc9a510e0..56d0417065 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -225,5 +225,14 @@  config TCG_FTPM_TEE
 	help
 	  This driver proxies for firmware TPM running in TEE.
 
+config TCG_LSSE
+	tristate "Loongson TPM Interface"
+	depends on MFD_LS6000SE
+	help
+	  If you want to make Loongson TPM support available, say Yes and
+	  it will be accessible from within Linux. To compile this
+	  driver as a module, choose M here; the module will be called
+	  tpm_lsse.
+
 source "drivers/char/tpm/st33zp24/Kconfig"
 endif # TCG_TPM
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 9bb142c752..bf2280352d 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -44,3 +44,4 @@  obj-$(CONFIG_TCG_XEN) += xen-tpmfront.o
 obj-$(CONFIG_TCG_CRB) += tpm_crb.o
 obj-$(CONFIG_TCG_VTPM_PROXY) += tpm_vtpm_proxy.o
 obj-$(CONFIG_TCG_FTPM_TEE) += tpm_ftpm_tee.o
+obj-$(CONFIG_TCG_LSSE) += tpm_lsse.o
diff --git a/drivers/char/tpm/tpm_lsse.c b/drivers/char/tpm/tpm_lsse.c
new file mode 100644
index 0000000000..3fd2d9bac8
--- /dev/null
+++ b/drivers/char/tpm/tpm_lsse.c
@@ -0,0 +1,104 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 Loongson Technology Corporation Limited. */
+
+#include <linux/device.h>
+#include <linux/mfd/ls6000se.h>
+#include <linux/platform_device.h>
+#include <linux/wait.h>
+
+#include "tpm.h"
+
+struct tpm_msg {
+	u32 cmd;
+	u32 data_off;
+	u32 data_len;
+	u32 info[5];
+};
+
+struct tpm_dev {
+	struct lsse_ch *se_ch;
+	struct completion tpm_completion;
+};
+
+static void tpm_complete(struct lsse_ch *ch)
+{
+	struct tpm_dev *td = ch->priv;
+
+	complete(&td->tpm_completion);
+}
+
+static int tpm_ls_recv(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+	struct tpm_dev *td = dev_get_drvdata(&chip->dev);
+	struct tpm_msg *rmsg;
+	int sig;
+
+	sig = wait_for_completion_interruptible(&td->tpm_completion);
+	if (sig)
+		return sig;
+
+	rmsg = td->se_ch->rmsg;
+	memcpy(buf, td->se_ch->data_buffer, rmsg->data_len);
+
+	return rmsg->data_len;
+}
+
+static int tpm_ls_send(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+	struct tpm_dev *td = dev_get_drvdata(&chip->dev);
+	struct tpm_msg *smsg = td->se_ch->smsg;
+
+	memcpy(td->se_ch->data_buffer, buf, count);
+	smsg->data_len = count;
+
+	return se_send_ch_requeset(td->se_ch);
+}
+
+static const struct tpm_class_ops lsse_tpm_ops = {
+	.flags = TPM_OPS_AUTO_STARTUP,
+	.recv = tpm_ls_recv,
+	.send = tpm_ls_send,
+};
+
+static int lsse_tpm_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct tpm_chip *chip;
+	struct tpm_msg *smsg;
+	struct tpm_dev *td;
+
+	td = devm_kzalloc(dev, sizeof(struct tpm_dev), GFP_KERNEL);
+	if (!td)
+		return -ENOMEM;
+
+	init_completion(&td->tpm_completion);
+	td->se_ch = se_init_ch(dev->parent, SE_CH_TPM, PAGE_SIZE,
+			       2 * sizeof(struct tpm_msg), td, tpm_complete);
+	if (!td->se_ch)
+		return -ENODEV;
+	smsg = td->se_ch->smsg;
+	smsg->cmd = SE_CMD_TPM;
+	smsg->data_off = td->se_ch->off;
+
+	chip = tpmm_chip_alloc(dev, &lsse_tpm_ops);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	chip->flags = TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_IRQ;
+	dev_set_drvdata(&chip->dev, td);
+
+	return tpm_chip_register(chip);
+}
+
+static struct platform_driver lsse_tpm_driver = {
+	.probe   = lsse_tpm_probe,
+	.driver  = {
+		.name  = "ls6000se-tpm",
+	},
+};
+module_platform_driver(lsse_tpm_driver);
+
+MODULE_ALIAS("platform:ls6000se-tpm");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yinggang Gu <guyinggang@loongson.cn>");
+MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@loongson.cn>");
+MODULE_DESCRIPTION("Loongson TPM driver");

[v2,3/3] tpm: Add a driver for Loongson TPM device

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