tpm: tis: add support for MMIO TPM on SynQuacer

When fitted, the SynQuacer platform exposes its SPI TPM via a MMIO
window that is backed by the SPI command sequencer in the SPI bus
controller. This arrangement has the limitation that only byte size
accesses are supported, and so we'll need to provide a separate module
that take this into account.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Masahisa Kojima 2020-07-28 12:14:31 +09:00 committed by Jarkko Sakkinen
parent fcadab7404
commit d5ae56a4fe
3 changed files with 221 additions and 0 deletions

View File

@ -74,6 +74,18 @@ config TCG_TIS_SPI_CR50
If you have a H1 secure module running Cr50 firmware on SPI bus,
say Yes and it will be accessible from within Linux.
config TCG_TIS_SYNQUACER
tristate "TPM Interface Specification 1.2 Interface / TPM 2.0 FIFO Interface (MMIO - SynQuacer)"
depends on ARCH_SYNQUACER
select TCG_TIS_CORE
help
If you have a TPM security chip that is compliant with the
TCG TIS 1.2 TPM specification (TPM1.2) or the TCG PTP FIFO
specification (TPM2.0) say Yes and it will be accessible from
within Linux on Socionext SynQuacer platform.
To compile this driver as a module, choose M here;
the module will be called tpm_tis_synquacer.
config TCG_TIS_I2C_ATMEL
tristate "TPM Interface Specification 1.2 Interface (I2C - Atmel)"
depends on I2C

View File

@ -21,6 +21,7 @@ tpm-$(CONFIG_EFI) += eventlog/efi.o
tpm-$(CONFIG_OF) += eventlog/of.o
obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o
obj-$(CONFIG_TCG_TIS) += tpm_tis.o
obj-$(CONFIG_TCG_TIS_SYNQUACER) += tpm_tis_synquacer.o
obj-$(CONFIG_TCG_TIS_SPI) += tpm_tis_spi.o
tpm_tis_spi-y := tpm_tis_spi_main.o

View File

@ -0,0 +1,208 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 Linaro Ltd.
*
* This device driver implements MMIO TPM on SynQuacer Platform.
*/
#include <linux/acpi.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/kernel.h>
#include "tpm.h"
#include "tpm_tis_core.h"
/*
* irq > 0 means: use irq $irq;
* irq = 0 means: autoprobe for an irq;
* irq = -1 means: no irq support
*/
struct tpm_tis_synquacer_info {
struct resource res;
int irq;
};
struct tpm_tis_synquacer_phy {
struct tpm_tis_data priv;
void __iomem *iobase;
};
static inline struct tpm_tis_synquacer_phy *to_tpm_tis_tcg_phy(struct tpm_tis_data *data)
{
return container_of(data, struct tpm_tis_synquacer_phy, priv);
}
static int tpm_tis_synquacer_read_bytes(struct tpm_tis_data *data, u32 addr,
u16 len, u8 *result)
{
struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
while (len--)
*result++ = ioread8(phy->iobase + addr);
return 0;
}
static int tpm_tis_synquacer_write_bytes(struct tpm_tis_data *data, u32 addr,
u16 len, const u8 *value)
{
struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
while (len--)
iowrite8(*value++, phy->iobase + addr);
return 0;
}
static int tpm_tis_synquacer_read16_bw(struct tpm_tis_data *data,
u32 addr, u16 *result)
{
struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
/*
* Due to the limitation of SPI controller on SynQuacer,
* 16/32 bits access must be done in byte-wise and descending order.
*/
*result = (ioread8(phy->iobase + addr + 1) << 8) |
(ioread8(phy->iobase + addr));
return 0;
}
static int tpm_tis_synquacer_read32_bw(struct tpm_tis_data *data,
u32 addr, u32 *result)
{
struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
/*
* Due to the limitation of SPI controller on SynQuacer,
* 16/32 bits access must be done in byte-wise and descending order.
*/
*result = (ioread8(phy->iobase + addr + 3) << 24) |
(ioread8(phy->iobase + addr + 2) << 16) |
(ioread8(phy->iobase + addr + 1) << 8) |
(ioread8(phy->iobase + addr));
return 0;
}
static int tpm_tis_synquacer_write32_bw(struct tpm_tis_data *data,
u32 addr, u32 value)
{
struct tpm_tis_synquacer_phy *phy = to_tpm_tis_tcg_phy(data);
/*
* Due to the limitation of SPI controller on SynQuacer,
* 16/32 bits access must be done in byte-wise and descending order.
*/
iowrite8(value >> 24, phy->iobase + addr + 3);
iowrite8(value >> 16, phy->iobase + addr + 2);
iowrite8(value >> 8, phy->iobase + addr + 1);
iowrite8(value, phy->iobase + addr);
return 0;
}
static const struct tpm_tis_phy_ops tpm_tcg_bw = {
.read_bytes = tpm_tis_synquacer_read_bytes,
.write_bytes = tpm_tis_synquacer_write_bytes,
.read16 = tpm_tis_synquacer_read16_bw,
.read32 = tpm_tis_synquacer_read32_bw,
.write32 = tpm_tis_synquacer_write32_bw,
};
static int tpm_tis_synquacer_init(struct device *dev,
struct tpm_tis_synquacer_info *tpm_info)
{
struct tpm_tis_synquacer_phy *phy;
phy = devm_kzalloc(dev, sizeof(struct tpm_tis_synquacer_phy), GFP_KERNEL);
if (phy == NULL)
return -ENOMEM;
phy->iobase = devm_ioremap_resource(dev, &tpm_info->res);
if (IS_ERR(phy->iobase))
return PTR_ERR(phy->iobase);
return tpm_tis_core_init(dev, &phy->priv, tpm_info->irq, &tpm_tcg_bw,
ACPI_HANDLE(dev));
}
static SIMPLE_DEV_PM_OPS(tpm_tis_synquacer_pm, tpm_pm_suspend, tpm_tis_resume);
static int tpm_tis_synquacer_probe(struct platform_device *pdev)
{
struct tpm_tis_synquacer_info tpm_info = {};
struct resource *res;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (res == NULL) {
dev_err(&pdev->dev, "no memory resource defined\n");
return -ENODEV;
}
tpm_info.res = *res;
tpm_info.irq = -1;
return tpm_tis_synquacer_init(&pdev->dev, &tpm_info);
}
static int tpm_tis_synquacer_remove(struct platform_device *pdev)
{
struct tpm_chip *chip = dev_get_drvdata(&pdev->dev);
tpm_chip_unregister(chip);
tpm_tis_remove(chip);
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id tis_synquacer_of_platform_match[] = {
{.compatible = "socionext,synquacer-tpm-mmio"},
{},
};
MODULE_DEVICE_TABLE(of, tis_synquacer_of_platform_match);
#endif
#ifdef CONFIG_ACPI
static const struct acpi_device_id tpm_synquacer_acpi_tbl[] = {
{ "SCX0009" },
{},
};
MODULE_DEVICE_TABLE(acpi, tpm_synquacer_acpi_tbl);
#endif
static struct platform_driver tis_synquacer_drv = {
.probe = tpm_tis_synquacer_probe,
.remove = tpm_tis_synquacer_remove,
.driver = {
.name = "tpm_tis_synquacer",
.pm = &tpm_tis_synquacer_pm,
.of_match_table = of_match_ptr(tis_synquacer_of_platform_match),
.acpi_match_table = ACPI_PTR(tpm_synquacer_acpi_tbl),
},
};
static int __init tpm_tis_synquacer_module_init(void)
{
int rc;
rc = platform_driver_register(&tis_synquacer_drv);
if (rc)
return rc;
return 0;
}
static void __exit tpm_tis_synquacer_module_exit(void)
{
platform_driver_unregister(&tis_synquacer_drv);
}
module_init(tpm_tis_synquacer_module_init);
module_exit(tpm_tis_synquacer_module_exit);
MODULE_DESCRIPTION("TPM MMIO Driver for Socionext SynQuacer platform");
MODULE_LICENSE("GPL");