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path: root/drivers/char/tpm/tpm_tis_spi.c
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Diffstat (limited to 'drivers/char/tpm/tpm_tis_spi.c')
-rw-r--r--drivers/char/tpm/tpm_tis_spi.c271
1 files changed, 0 insertions, 271 deletions
diff --git a/drivers/char/tpm/tpm_tis_spi.c b/drivers/char/tpm/tpm_tis_spi.c
deleted file mode 100644
index 9914f6973463..000000000000
--- a/drivers/char/tpm/tpm_tis_spi.c
+++ /dev/null
@@ -1,271 +0,0 @@
-/*
- * 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.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation, version 2 of the
- * License.
- */
-
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/moduleparam.h>
-#include <linux/slab.h>
-#include <linux/interrupt.h>
-#include <linux/wait.h>
-#include <linux/acpi.h>
-#include <linux/freezer.h>
-
-#include <linux/spi/spi.h>
-#include <linux/gpio.h>
-#include <linux/of_irq.h>
-#include <linux/of_gpio.h>
-#include <linux/tpm.h>
-#include "tpm.h"
-#include "tpm_tis_core.h"
-
-#define MAX_SPI_FRAMESIZE 64
-
-struct tpm_tis_spi_phy {
- struct tpm_tis_data priv;
- struct spi_device *spi_device;
- u8 *iobuf;
-};
-
-static inline struct tpm_tis_spi_phy *to_tpm_tis_spi_phy(struct tpm_tis_data *data)
-{
- return container_of(data, struct tpm_tis_spi_phy, priv);
-}
-
-static 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;
- int i;
- 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;
-
- if ((phy->iobuf[3] & 0x01) == 0) {
- // handle SPI wait states
- phy->iobuf[0] = 0;
-
- 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)
- goto exit;
- if (phy->iobuf[0] & 0x01)
- break;
- }
-
- if (i == TPM_RETRY) {
- ret = -ETIMEDOUT;
- goto exit;
- }
- }
-
- spi_xfer.cs_change = 0;
- spi_xfer.len = transfer_len;
- spi_xfer.delay_usecs = 5;
-
- if (in) {
- spi_xfer.tx_buf = NULL;
- } else if (out) {
- 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);
- 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)
-{
- 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)
-{
- return tpm_tis_spi_transfer(data, addr, len, NULL, value);
-}
-
-static int tpm_tis_spi_read16(struct tpm_tis_data *data, u32 addr, u16 *result)
-{
- __le16 result_le;
- int rc;
-
- rc = data->phy_ops->read_bytes(data, addr, sizeof(u16),
- (u8 *)&result_le);
- if (!rc)
- *result = le16_to_cpu(result_le);
-
- return rc;
-}
-
-static int tpm_tis_spi_read32(struct tpm_tis_data *data, u32 addr, u32 *result)
-{
- __le32 result_le;
- int rc;
-
- rc = data->phy_ops->read_bytes(data, addr, sizeof(u32),
- (u8 *)&result_le);
- if (!rc)
- *result = le32_to_cpu(result_le);
-
- return rc;
-}
-
-static int tpm_tis_spi_write32(struct tpm_tis_data *data, u32 addr, u32 value)
-{
- __le32 value_le;
- int rc;
-
- value_le = cpu_to_le32(value);
- rc = data->phy_ops->write_bytes(data, addr, sizeof(u32),
- (u8 *)&value_le);
-
- return rc;
-}
-
-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,
- .read16 = tpm_tis_spi_read16,
- .read32 = tpm_tis_spi_read32,
- .write32 = tpm_tis_spi_write32,
-};
-
-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->spi_device = dev;
-
- phy->iobuf = devm_kmalloc(&dev->dev, MAX_SPI_FRAMESIZE, GFP_KERNEL);
- if (!phy->iobuf)
- return -ENOMEM;
-
- /* If the SPI device has an IRQ then use that */
- if (dev->irq > 0)
- irq = dev->irq;
- else
- irq = -1;
-
- return tpm_tis_core_init(&dev->dev, &phy->priv, irq, &tpm_spi_phy_ops,
- NULL);
-}
-
-static SIMPLE_DEV_PM_OPS(tpm_tis_pm, tpm_pm_suspend, tpm_tis_resume);
-
-static int tpm_tis_spi_remove(struct spi_device *dev)
-{
- struct tpm_chip *chip = spi_get_drvdata(dev);
-
- tpm_chip_unregister(chip);
- tpm_tis_remove(chip);
- return 0;
-}
-
-static const struct spi_device_id tpm_tis_spi_id[] = {
- {"tpm_tis_spi", 0},
- {}
-};
-MODULE_DEVICE_TABLE(spi, tpm_tis_spi_id);
-
-static const struct of_device_id of_tis_spi_match[] = {
- { .compatible = "st,st33htpm-spi", },
- { .compatible = "infineon,slb9670", },
- { .compatible = "tcg,tpm_tis-spi", },
- {}
-};
-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 = {
- .owner = THIS_MODULE,
- .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 = tpm_tis_spi_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");
generated by cgit (git 2.34.1) at 2025-12-25 16:37:10 +0000