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Message-Id: <20250212033113.15137-4-zhaoqunqin@loongson.cn>
Date: Wed, 12 Feb 2025 11:31:13 +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 v2 3/3] tpm: Add a driver for Loongson TPM device
TPM2.0 is implemented in Loongson security engine. This is the driver
for it.
Co-developed-by: Yinggang Gu <guyinggang@...ngson.cn>
Signed-off-by: Yinggang Gu <guyinggang@...ngson.cn>
Signed-off-by: Qunqin Zhao <zhaoqunqin@...ngson.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@...ngson.com>
L: linux-crypto@...r.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@...ngson.cn>");
+MODULE_AUTHOR("Qunqin Zhao <zhaoqunqin@...ngson.cn>");
+MODULE_DESCRIPTION("Loongson TPM driver");
--
2.43.0
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