mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Johannes Holland](/assets/img/avatar_default.png)
Only tpm_tis and tpm_tis_synquacer have a dedicated way to access multiple bytes at once, every other driver will just fall back to read_bytes/write_bytes. Therefore, remove the read16/read32/write32 calls and move their logic to read_bytes/write_bytes. Suggested-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Johannes Holland <johannes.holland@infineon.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
264 lines
6.6 KiB
C
264 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2015 Infineon Technologies AG
|
|
* Copyright (C) 2016 STMicroelectronics SAS
|
|
*
|
|
* Authors:
|
|
* Peter Huewe <peter.huewe@infineon.com>
|
|
* Christophe Ricard <christophe-h.ricard@st.com>
|
|
*
|
|
* Maintained by: <tpmdd-devel@lists.sourceforge.net>
|
|
*
|
|
* Device driver for TCG/TCPA TPM (trusted platform module).
|
|
* Specifications at www.trustedcomputinggroup.org
|
|
*
|
|
* This device driver implements the TPM interface as defined in
|
|
* the TCG TPM Interface Spec version 1.3, revision 27 via _raw/native
|
|
* SPI access_.
|
|
*
|
|
* It is based on the original tpm_tis device driver from Leendert van
|
|
* Dorn and Kyleen Hall and Jarko Sakkinnen.
|
|
*/
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/completion.h>
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/of_device.h>
|
|
#include <linux/spi/spi.h>
|
|
#include <linux/tpm.h>
|
|
|
|
#include "tpm.h"
|
|
#include "tpm_tis_core.h"
|
|
#include "tpm_tis_spi.h"
|
|
|
|
#define MAX_SPI_FRAMESIZE 64
|
|
|
|
/*
|
|
* TCG SPI flow control is documented in section 6.4 of the spec[1]. In short,
|
|
* keep trying to read from the device until MISO goes high indicating the
|
|
* wait state has ended.
|
|
*
|
|
* [1] https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
|
|
*/
|
|
static int tpm_tis_spi_flow_control(struct tpm_tis_spi_phy *phy,
|
|
struct spi_transfer *spi_xfer)
|
|
{
|
|
struct spi_message m;
|
|
int ret, i;
|
|
|
|
if ((phy->iobuf[3] & 0x01) == 0) {
|
|
// handle SPI wait states
|
|
for (i = 0; i < TPM_RETRY; i++) {
|
|
spi_xfer->len = 1;
|
|
spi_message_init(&m);
|
|
spi_message_add_tail(spi_xfer, &m);
|
|
ret = spi_sync_locked(phy->spi_device, &m);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (phy->iobuf[0] & 0x01)
|
|
break;
|
|
}
|
|
|
|
if (i == TPM_RETRY)
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16 len,
|
|
u8 *in, const u8 *out)
|
|
{
|
|
struct tpm_tis_spi_phy *phy = to_tpm_tis_spi_phy(data);
|
|
int ret = 0;
|
|
struct spi_message m;
|
|
struct spi_transfer spi_xfer;
|
|
u8 transfer_len;
|
|
|
|
spi_bus_lock(phy->spi_device->master);
|
|
|
|
while (len) {
|
|
transfer_len = min_t(u16, len, MAX_SPI_FRAMESIZE);
|
|
|
|
phy->iobuf[0] = (in ? 0x80 : 0) | (transfer_len - 1);
|
|
phy->iobuf[1] = 0xd4;
|
|
phy->iobuf[2] = addr >> 8;
|
|
phy->iobuf[3] = addr;
|
|
|
|
memset(&spi_xfer, 0, sizeof(spi_xfer));
|
|
spi_xfer.tx_buf = phy->iobuf;
|
|
spi_xfer.rx_buf = phy->iobuf;
|
|
spi_xfer.len = 4;
|
|
spi_xfer.cs_change = 1;
|
|
|
|
spi_message_init(&m);
|
|
spi_message_add_tail(&spi_xfer, &m);
|
|
ret = spi_sync_locked(phy->spi_device, &m);
|
|
if (ret < 0)
|
|
goto exit;
|
|
|
|
/* Flow control transfers are receive only */
|
|
spi_xfer.tx_buf = NULL;
|
|
ret = phy->flow_control(phy, &spi_xfer);
|
|
if (ret < 0)
|
|
goto exit;
|
|
|
|
spi_xfer.cs_change = 0;
|
|
spi_xfer.len = transfer_len;
|
|
spi_xfer.delay.value = 5;
|
|
spi_xfer.delay.unit = SPI_DELAY_UNIT_USECS;
|
|
|
|
if (out) {
|
|
spi_xfer.tx_buf = phy->iobuf;
|
|
spi_xfer.rx_buf = NULL;
|
|
memcpy(phy->iobuf, out, transfer_len);
|
|
out += transfer_len;
|
|
}
|
|
|
|
spi_message_init(&m);
|
|
spi_message_add_tail(&spi_xfer, &m);
|
|
reinit_completion(&phy->ready);
|
|
ret = spi_sync_locked(phy->spi_device, &m);
|
|
if (ret < 0)
|
|
goto exit;
|
|
|
|
if (in) {
|
|
memcpy(in, phy->iobuf, transfer_len);
|
|
in += transfer_len;
|
|
}
|
|
|
|
len -= transfer_len;
|
|
}
|
|
|
|
exit:
|
|
spi_bus_unlock(phy->spi_device->master);
|
|
return ret;
|
|
}
|
|
|
|
static int tpm_tis_spi_read_bytes(struct tpm_tis_data *data, u32 addr,
|
|
u16 len, u8 *result, enum tpm_tis_io_mode io_mode)
|
|
{
|
|
return tpm_tis_spi_transfer(data, addr, len, result, NULL);
|
|
}
|
|
|
|
static int tpm_tis_spi_write_bytes(struct tpm_tis_data *data, u32 addr,
|
|
u16 len, const u8 *value, enum tpm_tis_io_mode io_mode)
|
|
{
|
|
return tpm_tis_spi_transfer(data, addr, len, NULL, value);
|
|
}
|
|
|
|
int tpm_tis_spi_init(struct spi_device *spi, struct tpm_tis_spi_phy *phy,
|
|
int irq, const struct tpm_tis_phy_ops *phy_ops)
|
|
{
|
|
phy->iobuf = devm_kmalloc(&spi->dev, MAX_SPI_FRAMESIZE, GFP_KERNEL);
|
|
if (!phy->iobuf)
|
|
return -ENOMEM;
|
|
|
|
phy->spi_device = spi;
|
|
|
|
return tpm_tis_core_init(&spi->dev, &phy->priv, irq, phy_ops, NULL);
|
|
}
|
|
|
|
static const struct tpm_tis_phy_ops tpm_spi_phy_ops = {
|
|
.read_bytes = tpm_tis_spi_read_bytes,
|
|
.write_bytes = tpm_tis_spi_write_bytes,
|
|
};
|
|
|
|
static int tpm_tis_spi_probe(struct spi_device *dev)
|
|
{
|
|
struct tpm_tis_spi_phy *phy;
|
|
int irq;
|
|
|
|
phy = devm_kzalloc(&dev->dev, sizeof(struct tpm_tis_spi_phy),
|
|
GFP_KERNEL);
|
|
if (!phy)
|
|
return -ENOMEM;
|
|
|
|
phy->flow_control = tpm_tis_spi_flow_control;
|
|
|
|
/* If the SPI device has an IRQ then use that */
|
|
if (dev->irq > 0)
|
|
irq = dev->irq;
|
|
else
|
|
irq = -1;
|
|
|
|
init_completion(&phy->ready);
|
|
return tpm_tis_spi_init(dev, phy, irq, &tpm_spi_phy_ops);
|
|
}
|
|
|
|
typedef int (*tpm_tis_spi_probe_func)(struct spi_device *);
|
|
|
|
static int tpm_tis_spi_driver_probe(struct spi_device *spi)
|
|
{
|
|
const struct spi_device_id *spi_dev_id = spi_get_device_id(spi);
|
|
tpm_tis_spi_probe_func probe_func;
|
|
|
|
probe_func = of_device_get_match_data(&spi->dev);
|
|
if (!probe_func) {
|
|
if (spi_dev_id) {
|
|
probe_func = (tpm_tis_spi_probe_func)spi_dev_id->driver_data;
|
|
if (!probe_func)
|
|
return -ENODEV;
|
|
} else
|
|
probe_func = tpm_tis_spi_probe;
|
|
}
|
|
|
|
return probe_func(spi);
|
|
}
|
|
|
|
static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_spi_resume);
|
|
|
|
static void tpm_tis_spi_remove(struct spi_device *dev)
|
|
{
|
|
struct tpm_chip *chip = spi_get_drvdata(dev);
|
|
|
|
tpm_chip_unregister(chip);
|
|
tpm_tis_remove(chip);
|
|
}
|
|
|
|
static const struct spi_device_id tpm_tis_spi_id[] = {
|
|
{ "st33htpm-spi", (unsigned long)tpm_tis_spi_probe },
|
|
{ "slb9670", (unsigned long)tpm_tis_spi_probe },
|
|
{ "tpm_tis_spi", (unsigned long)tpm_tis_spi_probe },
|
|
{ "tpm_tis-spi", (unsigned long)tpm_tis_spi_probe },
|
|
{ "cr50", (unsigned long)cr50_spi_probe },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(spi, tpm_tis_spi_id);
|
|
|
|
static const struct of_device_id of_tis_spi_match[] = {
|
|
{ .compatible = "st,st33htpm-spi", .data = tpm_tis_spi_probe },
|
|
{ .compatible = "infineon,slb9670", .data = tpm_tis_spi_probe },
|
|
{ .compatible = "tcg,tpm_tis-spi", .data = tpm_tis_spi_probe },
|
|
{ .compatible = "google,cr50", .data = cr50_spi_probe },
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(of, of_tis_spi_match);
|
|
|
|
static const struct acpi_device_id acpi_tis_spi_match[] = {
|
|
{"SMO0768", 0},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, acpi_tis_spi_match);
|
|
|
|
static struct spi_driver tpm_tis_spi_driver = {
|
|
.driver = {
|
|
.name = "tpm_tis_spi",
|
|
.pm = &tpm_tis_pm,
|
|
.of_match_table = of_match_ptr(of_tis_spi_match),
|
|
.acpi_match_table = ACPI_PTR(acpi_tis_spi_match),
|
|
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
},
|
|
.probe = tpm_tis_spi_driver_probe,
|
|
.remove = tpm_tis_spi_remove,
|
|
.id_table = tpm_tis_spi_id,
|
|
};
|
|
module_spi_driver(tpm_tis_spi_driver);
|
|
|
|
MODULE_DESCRIPTION("TPM Driver for native SPI access");
|
|
MODULE_LICENSE("GPL");
|