@@ -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
@@ -45,3 +45,4 @@ obj-$(CONFIG_TCG_CRB) += tpm_crb.o
obj-$(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_LOONGSON) += tpm_loongson.o
new file mode 100644
@@ -0,0 +1,78 @@
+// 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;
+
+ 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 count)
+{
+ struct loongson_se_engine *tpm_engine = dev_get_drvdata(&chip->dev);
+ struct tpm_loongson_cmd *cmd = tpm_engine->command;
+
+ 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 = "loongson-tpm",
+ },
+};
+module_platform_driver(tpm_loongson);
+
+MODULE_ALIAS("platform:loongson-tpm");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Loongson TPM driver");