On Wed, Feb 19, 2025 at 03:33:49PM +0800, Qunqin Zhao wrote:
> Loongson security engine supports random number generation, hash,
> symmetric encryption and asymmetric encryption. Based on these
> encryption functions, TPM2 have been implemented in the Loongson
> security engine firmware. This driver is responsible for copying data
> into the memory visible to the firmware and receiving data from the
> firmware.
>
> Co-developed-by: Yinggang Gu <guyinggang@xxxxxxxxxxx>
> Signed-off-by: Yinggang Gu <guyinggang@xxxxxxxxxxx>
> Signed-off-by: Qunqin Zhao <zhaoqunqin@xxxxxxxxxxx>
> ---
> v3: Added reminder about Loongson security engine to git log.
>
> drivers/char/tpm/Kconfig | 9 ++++
> drivers/char/tpm/Makefile | 1 +
> drivers/char/tpm/tpm_lsse.c | 104 ++++++++++++++++++++++++++++++++++++
> 3 files changed, 114 insertions(+)
> create mode 100644 drivers/char/tpm/tpm_lsse.c
>
> 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)
tpm_lsse_
> +{
> + 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@xxxxxxxxxxx>");
> +MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@xxxxxxxxxxx>");
Remove MODULE_AUTHOR fields. Git encodes this already.
> +MODULE_DESCRIPTION("Loongson TPM driver");
> --
> 2.43.0
>
Prefix all with tpm_lsse instead of tpm
BR, Jarkko
