diff options
| -rw-r--r-- | drivers/tpm/Kconfig | 9 | ||||
| -rw-r--r-- | drivers/tpm/Makefile | 1 | ||||
| -rw-r--r-- | drivers/tpm/tpm2_tis_mmio.c | 157 |
3 files changed, 167 insertions, 0 deletions
diff --git a/drivers/tpm/Kconfig b/drivers/tpm/Kconfig index 9eebab5cfd..406ee8716e 100644 --- a/drivers/tpm/Kconfig +++ b/drivers/tpm/Kconfig @@ -161,6 +161,15 @@ config TPM2_FTPM_TEE help This driver supports firmware TPM running in TEE. +config TPM2_MMIO + bool "MMIO based TPM2 Interface" + depends on TPM_V2 + help + This driver supports firmware TPM2.0 MMIO interface. + The usual TPM operations and the 'tpm' command can be used to talk + to the device using the standard TPM Interface Specification (TIS) + protocol. + endif # TPM_V2 endmenu diff --git a/drivers/tpm/Makefile b/drivers/tpm/Makefile index c65be52670..494aa5a46d 100644 --- a/drivers/tpm/Makefile +++ b/drivers/tpm/Makefile @@ -14,3 +14,4 @@ obj-$(CONFIG_$(SPL_TPL_)TPM2_CR50_I2C) += cr50_i2c.o obj-$(CONFIG_TPM2_TIS_SANDBOX) += tpm2_tis_sandbox.o sandbox_common.o obj-$(CONFIG_TPM2_TIS_SPI) += tpm2_tis_spi.o obj-$(CONFIG_TPM2_FTPM_TEE) += tpm2_ftpm_tee.o +obj-$(CONFIG_TPM2_MMIO) += tpm2_tis_core.o tpm2_tis_mmio.o diff --git a/drivers/tpm/tpm2_tis_mmio.c b/drivers/tpm/tpm2_tis_mmio.c new file mode 100644 index 0000000000..9cedff2225 --- /dev/null +++ b/drivers/tpm/tpm2_tis_mmio.c @@ -0,0 +1,157 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * driver for mmio TCG/TIS TPM (trusted platform module). + * + * Specifications at www.trustedcomputinggroup.org + */ + +#include <common.h> +#include <dm.h> +#include <log.h> +#include <tpm-v2.h> +#include <linux/bitops.h> +#include <linux/compiler.h> +#include <linux/delay.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/io.h> +#include <linux/unaligned/be_byteshift.h> +#include "tpm_tis.h" +#include "tpm_internal.h" + +/** + * struct tpm_tis_chip_data - Information about an MMIO TPM + * @pcr_count: Number of PCR per bank + * @pcr_select_min: Minimum size in bytes of the pcrSelect array + * @iobase: Base address + */ +struct tpm_tis_chip_data { + unsigned int pcr_count; + unsigned int pcr_select_min; + void __iomem *iobase; +}; + +static int mmio_read_bytes(struct udevice *dev, u32 addr, u16 len, + u8 *result) +{ + struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev); + + while (len--) + *result++ = ioread8(drv_data->iobase + addr); + + return 0; +} + +static int mmio_write_bytes(struct udevice *dev, u32 addr, u16 len, + const u8 *value) +{ + struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev); + + while (len--) + iowrite8(*value++, drv_data->iobase + addr); + + return 0; +} + +static int mmio_read32(struct udevice *dev, u32 addr, u32 *result) +{ + struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev); + + *result = ioread32(drv_data->iobase + addr); + + return 0; +} + +static int mmio_write32(struct udevice *dev, u32 addr, u32 value) +{ + struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev); + + iowrite32(value, drv_data->iobase + addr); + + return 0; +} + +static struct tpm_tis_phy_ops phy_ops = { + .read_bytes = mmio_read_bytes, + .write_bytes = mmio_write_bytes, + .read32 = mmio_read32, + .write32 = mmio_write32, +}; + +static int tpm_tis_probe(struct udevice *dev) +{ + struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev); + struct tpm_chip_priv *priv = dev_get_uclass_priv(dev); + int ret = 0; + fdt_addr_t ioaddr; + u64 sz; + + ioaddr = dev_read_addr(dev); + if (ioaddr == FDT_ADDR_T_NONE) + return log_msg_ret("ioaddr", -EINVAL); + + ret = dev_read_u64(dev, "reg", &sz); + if (ret) + return -EINVAL; + + drv_data->iobase = ioremap(ioaddr, sz); + tpm_tis_ops_register(dev, &phy_ops); + ret = tpm_tis_init(dev); + if (ret) + goto iounmap; + + priv->pcr_count = drv_data->pcr_count; + priv->pcr_select_min = drv_data->pcr_select_min; + /* + * Although the driver probably works with a TPMv1 our Kconfig + * limits the driver to TPMv2 only + */ + priv->version = TPM_V2; + + return ret; +iounmap: + iounmap(drv_data->iobase); + + return -EINVAL; +} + +static int tpm_tis_remove(struct udevice *dev) +{ + struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev); + + iounmap(drv_data->iobase); + + return tpm_tis_cleanup(dev); +} + +static const struct tpm_ops tpm_tis_ops = { + .open = tpm_tis_open, + .close = tpm_tis_close, + .get_desc = tpm_tis_get_desc, + .send = tpm_tis_send, + .recv = tpm_tis_recv, + .cleanup = tpm_tis_cleanup, +}; + +static const struct tpm_tis_chip_data tpm_tis_std_chip_data = { + .pcr_count = 24, + .pcr_select_min = 3, +}; + +static const struct udevice_id tpm_tis_ids[] = { + { + .compatible = "tcg,tpm-tis-mmio", + .data = (ulong)&tpm_tis_std_chip_data, + }, + { } +}; + +U_BOOT_DRIVER(tpm_tis_mmio) = { + .name = "tpm_tis_mmio", + .id = UCLASS_TPM, + .of_match = tpm_tis_ids, + .ops = &tpm_tis_ops, + .probe = tpm_tis_probe, + .remove = tpm_tis_remove, + .priv_auto = sizeof(struct tpm_chip), +}; |