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Message-Id: <20250219073350.16915-2-zhaoqunqin@loongson.cn>
Date: Wed, 19 Feb 2025 15:33:49 +0800
From: Qunqin Zhao <zhaoqunqin@...ngson.cn>
To: lee@...nel.org,
herbert@...dor.apana.org.au,
davem@...emloft.net,
peterhuewe@....de,
jarkko@...nel.org
Cc: linux-kernel@...r.kernel.org,
loongarch@...ts.linux.dev,
linux-crypto@...r.kernel.org,
jgg@...pe.ca,
linux-integrity@...r.kernel.org,
Qunqin Zhao <zhaoqunqin@...ngson.cn>,
Yinggang Gu <guyinggang@...ngson.cn>
Subject: [PATCH V3 5/6] tpm: Add a driver for Loongson TPM device
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@...ngson.cn>
Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
Signed-off-by: Qunqin Zhao <zhaoqunqin@...ngson.cn>
---
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)
+{
+ 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@...ngson.cn>");
+MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@...ngson.cn>");
+MODULE_DESCRIPTION("Loongson TPM driver");
--
2.43.0
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