3 files changed, 94 insertions, 0 deletions
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
index dddd702b2454..ba3924eb13ba 100644
--- a/drivers/char/tpm/Kconfig
+++ b/drivers/char/tpm/Kconfig
@@ -189,6 +189,15 @@ config TCG_IBMVTPM
 	  will be accessible from within Linux.  To compile this driver
 	  as a module, choose M here; the module will be called tpm_ibmvtpm.
 
+config TCG_LOONGSON
+	tristate "Loongson TPM Interface"
+	depends on MFD_LOONGSON_SE
+	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_loongson.
+
 config TCG_XEN
 	tristate "XEN TPM Interface"
 	depends on TCG_TPM && XEN
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index 9de1b3ea34a9..5b5cdc0d32e4 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -46,3 +46,4 @@ obj-$(CONFIG_TCG_ARM_CRB_FFA) += tpm_crb_ffa.o
 obj-$(CONFIG_TCG_VTPM_PROXY) += tpm_vtpm_proxy.o
 obj-$(CONFIG_TCG_FTPM_TEE) += tpm_ftpm_tee.o
 obj-$(CONFIG_TCG_SVSM) += tpm_svsm.o
+obj-$(CONFIG_TCG_LOONGSON) += tpm_loongson.o
diff --git a/drivers/char/tpm/tpm_loongson.c b/drivers/char/tpm/tpm_loongson.c
new file mode 100644
index 000000000000..9e50250763d1
--- /dev/null
+++ b/drivers/char/tpm/tpm_loongson.c
@@ -0,0 +1,84 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2025 Loongson Technology Corporation Limited. */
+
+#include <linux/device.h>
+#include <linux/mfd/loongson-se.h>
+#include <linux/platform_device.h>
+#include <linux/wait.h>
+
+#include "tpm.h"
+
+struct tpm_loongson_cmd {
+	u32 cmd_id;
+	u32 data_off;
+	u32 data_len;
+	u32 pad[5];
+};
+
+static int tpm_loongson_recv(struct tpm_chip *chip, u8 *buf, size_t count)
+{
+	struct loongson_se_engine *tpm_engine = dev_get_drvdata(&chip->dev);
+	struct tpm_loongson_cmd *cmd_ret = tpm_engine->command_ret;
+
+	if (cmd_ret->data_len > count)
+		return -EIO;
+
+	memcpy(buf, tpm_engine->data_buffer, cmd_ret->data_len);
+
+	return cmd_ret->data_len;
+}
+
+static int tpm_loongson_send(struct tpm_chip *chip, u8 *buf, size_t bufsiz, size_t count)
+{
+	struct loongson_se_engine *tpm_engine = dev_get_drvdata(&chip->dev);
+	struct tpm_loongson_cmd *cmd = tpm_engine->command;
+
+	if (count > tpm_engine->buffer_size)
+		return -E2BIG;
+
+	cmd->data_len = count;
+	memcpy(tpm_engine->data_buffer, buf, count);
+
+	return loongson_se_send_engine_cmd(tpm_engine);
+}
+
+static const struct tpm_class_ops tpm_loongson_ops = {
+	.flags = TPM_OPS_AUTO_STARTUP,
+	.recv = tpm_loongson_recv,
+	.send = tpm_loongson_send,
+};
+
+static int tpm_loongson_probe(struct platform_device *pdev)
+{
+	struct loongson_se_engine *tpm_engine;
+	struct device *dev = &pdev->dev;
+	struct tpm_loongson_cmd *cmd;
+	struct tpm_chip *chip;
+
+	tpm_engine = loongson_se_init_engine(dev->parent, SE_ENGINE_TPM);
+	if (!tpm_engine)
+		return -ENODEV;
+	cmd = tpm_engine->command;
+	cmd->cmd_id = SE_CMD_TPM;
+	cmd->data_off = tpm_engine->buffer_off;
+
+	chip = tpmm_chip_alloc(dev, &tpm_loongson_ops);
+	if (IS_ERR(chip))
+		return PTR_ERR(chip);
+	chip->flags = TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_IRQ;
+	dev_set_drvdata(&chip->dev, tpm_engine);
+
+	return tpm_chip_register(chip);
+}
+
+static struct platform_driver tpm_loongson = {
+	.probe   = tpm_loongson_probe,
+	.driver  = {
+		.name  = "tpm_loongson",
+	},
+};
+module_platform_driver(tpm_loongson);
+
+MODULE_ALIAS("platform:tpm_loongson");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Loongson TPM driver");