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Add support for i2c devices
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This commit is contained in:
Tom Rini
commit
1b04a961c6
4 changed files with 185 additions and 3 deletions
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@ -185,6 +185,15 @@ config TPM2_TIS_SPI
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to the device using the standard TPM Interface Specification (TIS)
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protocol.
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config TPM2_TIS_I2C
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bool "Enable support for TPMv2.x I2C chips"
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depends on TPM_V2 && DM_I2C
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help
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This driver supports TPMv2.x devices connected on the I2C bus.
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The usual TPM operations and the 'tpm' command can be used to talk
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to the device using the standard TPM Interface Specification (TIS)
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protocol.
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config TPM2_FTPM_TEE
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bool "TEE based fTPM Interface"
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depends on TEE && OPTEE && TPM_V2
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@ -13,5 +13,6 @@ obj-$(CONFIG_TPM_ST33ZP24_SPI) += tpm_tis_st33zp24_spi.o
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obj-$(CONFIG_$(SPL_TPL_)TPM2_CR50_I2C) += cr50_i2c.o
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obj-$(CONFIG_TPM2_TIS_SANDBOX) += tpm2_tis_sandbox.o sandbox_common.o
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obj-$(CONFIG_TPM2_TIS_SPI) += tpm2_tis_core.o tpm2_tis_spi.o
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obj-$(CONFIG_TPM2_TIS_I2C) += tpm2_tis_core.o tpm2_tis_i2c.o
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obj-$(CONFIG_TPM2_FTPM_TEE) += tpm2_ftpm_tee.o
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obj-$(CONFIG_TPM2_MMIO) += tpm2_tis_core.o tpm2_tis_mmio.o
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@ -433,15 +433,16 @@ int tpm_tis_init(struct udevice *dev)
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log_err("Driver bug. No bus ops defined\n");
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return -1;
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}
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ret = tpm_tis_request_locality(dev, 0);
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if (ret)
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return ret;
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chip->timeout_a = TIS_SHORT_TIMEOUT_MS;
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chip->timeout_b = TIS_LONG_TIMEOUT_MS;
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chip->timeout_c = TIS_SHORT_TIMEOUT_MS;
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chip->timeout_d = TIS_SHORT_TIMEOUT_MS;
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ret = tpm_tis_request_locality(dev, 0);
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if (ret)
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return ret;
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/* Disable interrupts */
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phy_ops->read32(dev, TPM_INT_ENABLE(chip->locality), &tmp);
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tmp |= TPM_INTF_CMD_READY_INT | TPM_INTF_LOCALITY_CHANGE_INT |
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171
drivers/tpm/tpm2_tis_i2c.c
Normal file
171
drivers/tpm/tpm2_tis_i2c.c
Normal file
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@ -0,0 +1,171 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2022 IBM Corp.
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*/
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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <i2c.h>
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#include <log.h>
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#include <tpm-v2.h>
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#include <linux/bitops.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/compiler.h>
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#include <linux/types.h>
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#include <linux/unaligned/be_byteshift.h>
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#include <asm-generic/gpio.h>
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#include "tpm_tis.h"
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#include "tpm_internal.h"
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struct tpm_tis_chip_data {
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unsigned int pcr_count;
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unsigned int pcr_select_min;
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};
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static uint tpm_tis_i2c_address_to_register(u32 addr)
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{
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addr &= 0xFFF;
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/*
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* Adapt register addresses that have changed compared to older TIS
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* version.
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*/
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switch (addr) {
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case TPM_ACCESS(0):
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return 0x04;
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case TPM_DID_VID(0):
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return 0x48;
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case TPM_RID(0):
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return 0x4C;
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default:
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return addr;
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}
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}
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static int tpm_tis_i2c_read(struct udevice *dev, u32 addr, u16 len, u8 *in)
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{
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int rc;
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int count = 0;
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uint reg = tpm_tis_i2c_address_to_register(addr);
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do {
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rc = dm_i2c_read(dev, reg, in, len);
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udelay(SLEEP_DURATION_US);
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} while (rc && count++ < MAX_COUNT);
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return rc;
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}
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static int tpm_tis_i2c_write(struct udevice *dev, u32 addr, u16 len,
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const u8 *out)
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{
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int rc;
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int count = 0;
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uint reg = tpm_tis_i2c_address_to_register(addr);
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do {
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rc = dm_i2c_write(dev, reg, out, len);
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udelay(SLEEP_DURATION_US);
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} while (rc && count++ < MAX_COUNT);
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return rc;
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}
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static int tpm_tis_i2c_read32(struct udevice *dev, u32 addr, u32 *result)
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{
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__le32 result_le;
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int rc;
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rc = tpm_tis_i2c_read(dev, addr, sizeof(u32), (u8 *)&result_le);
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if (!rc)
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*result = le32_to_cpu(result_le);
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return rc;
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}
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static int tpm_tis_i2c_write32(struct udevice *dev, u32 addr, u32 value)
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{
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__le32 value_le = cpu_to_le32(value);
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return tpm_tis_i2c_write(dev, addr, sizeof(value), (u8 *)&value_le);
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}
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static struct tpm_tis_phy_ops phy_ops = {
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.read_bytes = tpm_tis_i2c_read,
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.write_bytes = tpm_tis_i2c_write,
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.read32 = tpm_tis_i2c_read32,
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.write32 = tpm_tis_i2c_write32,
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};
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static int tpm_tis_i2c_probe(struct udevice *udev)
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{
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struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(udev);
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struct tpm_chip_priv *priv = dev_get_uclass_priv(udev);
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int rc;
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u8 loc = 0;
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tpm_tis_ops_register(udev, &phy_ops);
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/*
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* Force locality 0. The core driver doesn't actually write the
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* locality register and instead just reads/writes various access
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* bits of the selected locality.
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*/
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rc = dm_i2c_write(udev, 0, &loc, 1);
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if (rc)
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return rc;
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rc = tpm_tis_init(udev);
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if (rc)
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return rc;
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priv->pcr_count = drv_data->pcr_count;
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priv->pcr_select_min = drv_data->pcr_select_min;
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priv->version = TPM_V2;
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return 0;
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}
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static int tpm_tis_i2c_remove(struct udevice *udev)
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{
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return tpm_tis_cleanup(udev);
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}
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static const struct tpm_ops tpm_tis_i2c_ops = {
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.open = tpm_tis_open,
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.close = tpm_tis_close,
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.get_desc = tpm_tis_get_desc,
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.send = tpm_tis_send,
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.recv = tpm_tis_recv,
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.cleanup = tpm_tis_cleanup,
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};
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static const struct tpm_tis_chip_data tpm_tis_std_chip_data = {
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.pcr_count = 24,
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.pcr_select_min = 3,
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};
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static const struct udevice_id tpm_tis_i2c_ids[] = {
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{
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.compatible = "nuvoton,npct75x",
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.data = (ulong)&tpm_tis_std_chip_data,
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},
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{
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.compatible = "tcg,tpm-tis-i2c",
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.data = (ulong)&tpm_tis_std_chip_data,
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},
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{ }
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};
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U_BOOT_DRIVER(tpm_tis_i2c) = {
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.name = "tpm_tis_i2c",
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.id = UCLASS_TPM,
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.of_match = tpm_tis_i2c_ids,
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.ops = &tpm_tis_i2c_ops,
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.probe = tpm_tis_i2c_probe,
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.remove = tpm_tis_i2c_remove,
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.priv_auto = sizeof(struct tpm_chip),
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};
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