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![Kayla Theil](/assets/img/avatar_default.png)
The reset function sets the pin to 0 then 1 but if the pin is marked ACTIVE_LOW in the DT it gets inverted and leaves the TPM in reset. Let the gpio driver take care of the reset polarity. Signed-off-by: Kayla Theil <kayla.theil@mixed-mode.de>
692 lines
15 KiB
C
692 lines
15 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Author:
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* Miquel Raynal <miquel.raynal@bootlin.com>
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*
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* Description:
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* SPI-level driver for TCG/TIS TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*
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* This device driver implements the TPM interface as defined in
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* the TCG SPI protocol stack version 2.0.
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*
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* It is based on the U-Boot driver tpm_tis_infineon_i2c.c.
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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 <log.h>
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#include <spi.h>
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#include <tpm-v2.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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DECLARE_GLOBAL_DATA_PTR;
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#define TPM_ACCESS(l) (0x0000 | ((l) << 12))
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#define TPM_INT_ENABLE(l) (0x0008 | ((l) << 12))
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#define TPM_STS(l) (0x0018 | ((l) << 12))
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#define TPM_DATA_FIFO(l) (0x0024 | ((l) << 12))
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#define TPM_DID_VID(l) (0x0F00 | ((l) << 12))
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#define TPM_RID(l) (0x0F04 | ((l) << 12))
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#define MAX_SPI_FRAMESIZE 64
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/* Number of wait states to wait for */
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#define TPM_WAIT_STATES 100
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/**
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* struct tpm_tis_chip_data - Non-discoverable TPM information
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*
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* @pcr_count: Number of PCR per bank
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* @pcr_select_min: Size in octets of the pcrSelect array
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*/
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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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unsigned int time_before_first_cmd_ms;
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};
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/**
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* tpm_tis_spi_read() - Read from TPM register
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*
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* @addr: register address to read from
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* @buffer: provided by caller
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* @len: number of bytes to read
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*
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* Read len bytes from TPM register and put them into
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* buffer (little-endian format, i.e. first byte is put into buffer[0]).
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*
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* NOTE: TPM is big-endian for multi-byte values. Multi-byte
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* values have to be swapped.
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*
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* @return -EIO on error, 0 on success.
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*/
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static int tpm_tis_spi_xfer(struct udevice *dev, u32 addr, const u8 *out,
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u8 *in, u16 len)
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{
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struct spi_slave *slave = dev_get_parent_priv(dev);
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int transfer_len, ret;
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u8 tx_buf[MAX_SPI_FRAMESIZE];
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u8 rx_buf[MAX_SPI_FRAMESIZE];
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if (in && out) {
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log(LOGC_NONE, LOGL_ERR, "%s: can't do full duplex\n",
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__func__);
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return -EINVAL;
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}
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ret = spi_claim_bus(slave);
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if (ret < 0) {
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log(LOGC_NONE, LOGL_ERR, "%s: could not claim bus\n", __func__);
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return ret;
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}
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while (len) {
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/* Request */
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transfer_len = min_t(u16, len, MAX_SPI_FRAMESIZE);
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tx_buf[0] = (in ? BIT(7) : 0) | (transfer_len - 1);
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tx_buf[1] = 0xD4;
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tx_buf[2] = addr >> 8;
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tx_buf[3] = addr;
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ret = spi_xfer(slave, 4 * 8, tx_buf, rx_buf, SPI_XFER_BEGIN);
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if (ret < 0) {
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log(LOGC_NONE, LOGL_ERR,
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"%s: spi request transfer failed (err: %d)\n",
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__func__, ret);
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goto release_bus;
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}
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/* Wait state */
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if (!(rx_buf[3] & 0x1)) {
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int i;
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for (i = 0; i < TPM_WAIT_STATES; i++) {
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ret = spi_xfer(slave, 1 * 8, NULL, rx_buf, 0);
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if (ret) {
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log(LOGC_NONE, LOGL_ERR,
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"%s: wait state failed: %d\n",
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__func__, ret);
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goto release_bus;
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}
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if (rx_buf[0] & 0x1)
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break;
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}
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if (i == TPM_WAIT_STATES) {
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log(LOGC_NONE, LOGL_ERR,
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"%s: timeout on wait state\n", __func__);
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ret = -ETIMEDOUT;
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goto release_bus;
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}
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}
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/* Read/Write */
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if (out) {
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memcpy(tx_buf, out, transfer_len);
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out += transfer_len;
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}
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ret = spi_xfer(slave, transfer_len * 8,
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out ? tx_buf : NULL,
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in ? rx_buf : NULL,
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SPI_XFER_END);
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if (ret) {
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log(LOGC_NONE, LOGL_ERR,
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"%s: spi read transfer failed (err: %d)\n",
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__func__, ret);
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goto release_bus;
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}
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if (in) {
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memcpy(in, rx_buf, transfer_len);
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in += transfer_len;
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}
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len -= transfer_len;
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}
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release_bus:
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/* If an error occurred, release the chip by deasserting the CS */
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if (ret < 0)
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spi_xfer(slave, 0, NULL, NULL, SPI_XFER_END);
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spi_release_bus(slave);
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return ret;
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}
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static int tpm_tis_spi_read(struct udevice *dev, u16 addr, u8 *in, u16 len)
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{
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return tpm_tis_spi_xfer(dev, addr, NULL, in, len);
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}
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static int tpm_tis_spi_read32(struct udevice *dev, u32 addr, u32 *result)
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{
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__le32 result_le;
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int ret;
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ret = tpm_tis_spi_read(dev, addr, (u8 *)&result_le, sizeof(u32));
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if (!ret)
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*result = le32_to_cpu(result_le);
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return ret;
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}
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static int tpm_tis_spi_write(struct udevice *dev, u16 addr, const u8 *out,
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u16 len)
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{
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return tpm_tis_spi_xfer(dev, addr, out, NULL, len);
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}
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static int tpm_tis_spi_check_locality(struct udevice *dev, int loc)
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{
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const u8 mask = TPM_ACCESS_ACTIVE_LOCALITY | TPM_ACCESS_VALID;
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struct tpm_chip *chip = dev_get_priv(dev);
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u8 buf;
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int ret;
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ret = tpm_tis_spi_read(dev, TPM_ACCESS(loc), &buf, 1);
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if (ret)
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return ret;
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if ((buf & mask) == mask) {
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chip->locality = loc;
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return 0;
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}
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return -ENOENT;
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}
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static void tpm_tis_spi_release_locality(struct udevice *dev, int loc,
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bool force)
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{
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const u8 mask = TPM_ACCESS_REQUEST_PENDING | TPM_ACCESS_VALID;
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u8 buf;
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if (tpm_tis_spi_read(dev, TPM_ACCESS(loc), &buf, 1) < 0)
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return;
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if (force || (buf & mask) == mask) {
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buf = TPM_ACCESS_ACTIVE_LOCALITY;
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tpm_tis_spi_write(dev, TPM_ACCESS(loc), &buf, 1);
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}
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}
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static int tpm_tis_spi_request_locality(struct udevice *dev, int loc)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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unsigned long start, stop;
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u8 buf = TPM_ACCESS_REQUEST_USE;
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int ret;
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ret = tpm_tis_spi_check_locality(dev, loc);
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if (!ret)
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return 0;
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if (ret != -ENOENT) {
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log(LOGC_NONE, LOGL_ERR, "%s: Failed to get locality: %d\n",
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__func__, ret);
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return ret;
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}
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ret = tpm_tis_spi_write(dev, TPM_ACCESS(loc), &buf, 1);
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if (ret) {
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log(LOGC_NONE, LOGL_ERR, "%s: Failed to write to TPM: %d\n",
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__func__, ret);
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return ret;
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}
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start = get_timer(0);
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stop = chip->timeout_a;
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do {
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ret = tpm_tis_spi_check_locality(dev, loc);
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if (!ret)
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return 0;
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if (ret != -ENOENT) {
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log(LOGC_NONE, LOGL_ERR,
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"%s: Failed to get locality: %d\n", __func__, ret);
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return ret;
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}
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mdelay(TPM_TIMEOUT_MS);
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} while (get_timer(start) < stop);
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log(LOGC_NONE, LOGL_ERR, "%s: Timeout getting locality: %d\n", __func__,
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ret);
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return ret;
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}
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static u8 tpm_tis_spi_status(struct udevice *dev, u8 *status)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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return tpm_tis_spi_read(dev, TPM_STS(chip->locality), status, 1);
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}
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static int tpm_tis_spi_wait_for_stat(struct udevice *dev, u8 mask,
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unsigned long timeout, u8 *status)
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{
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unsigned long start = get_timer(0);
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unsigned long stop = timeout;
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int ret;
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do {
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mdelay(TPM_TIMEOUT_MS);
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ret = tpm_tis_spi_status(dev, status);
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if (ret)
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return ret;
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if ((*status & mask) == mask)
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return 0;
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} while (get_timer(start) < stop);
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return -ETIMEDOUT;
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}
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static u8 tpm_tis_spi_valid_status(struct udevice *dev, u8 *status)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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return tpm_tis_spi_wait_for_stat(dev, TPM_STS_VALID,
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chip->timeout_c, status);
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}
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static int tpm_tis_spi_get_burstcount(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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unsigned long start, stop;
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u32 burstcount, ret;
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/* wait for burstcount */
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start = get_timer(0);
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stop = chip->timeout_d;
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do {
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ret = tpm_tis_spi_read32(dev, TPM_STS(chip->locality),
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&burstcount);
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if (ret)
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return -EBUSY;
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burstcount = (burstcount >> 8) & 0xFFFF;
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if (burstcount)
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return burstcount;
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mdelay(TPM_TIMEOUT_MS);
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} while (get_timer(start) < stop);
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return -EBUSY;
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}
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static int tpm_tis_spi_cancel(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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u8 data = TPM_STS_COMMAND_READY;
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return tpm_tis_spi_write(dev, TPM_STS(chip->locality), &data, 1);
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}
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static int tpm_tis_spi_recv_data(struct udevice *dev, u8 *buf, size_t count)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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int size = 0, burstcnt, len, ret;
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u8 status;
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while (size < count &&
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tpm_tis_spi_wait_for_stat(dev,
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TPM_STS_DATA_AVAIL | TPM_STS_VALID,
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chip->timeout_c, &status) == 0) {
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burstcnt = tpm_tis_spi_get_burstcount(dev);
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if (burstcnt < 0)
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return burstcnt;
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len = min_t(int, burstcnt, count - size);
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ret = tpm_tis_spi_read(dev, TPM_DATA_FIFO(chip->locality),
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buf + size, len);
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if (ret < 0)
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return ret;
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size += len;
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}
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return size;
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}
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static int tpm_tis_spi_recv(struct udevice *dev, u8 *buf, size_t count)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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int size, expected;
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if (!chip)
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return -ENODEV;
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if (count < TPM_HEADER_SIZE) {
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size = -EIO;
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goto out;
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}
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size = tpm_tis_spi_recv_data(dev, buf, TPM_HEADER_SIZE);
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if (size < TPM_HEADER_SIZE) {
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log(LOGC_NONE, LOGL_ERR, "TPM error, unable to read header\n");
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goto out;
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}
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expected = get_unaligned_be32(buf + 2);
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if (expected > count) {
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size = -EIO;
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goto out;
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}
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size += tpm_tis_spi_recv_data(dev, &buf[TPM_HEADER_SIZE],
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expected - TPM_HEADER_SIZE);
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if (size < expected) {
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log(LOGC_NONE, LOGL_ERR,
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"TPM error, unable to read remaining bytes of result\n");
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size = -EIO;
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goto out;
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}
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out:
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tpm_tis_spi_cancel(dev);
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tpm_tis_spi_release_locality(dev, chip->locality, false);
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return size;
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}
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static int tpm_tis_spi_send(struct udevice *dev, const u8 *buf, size_t len)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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u32 i, size;
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u8 status;
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int burstcnt, ret;
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u8 data;
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if (!chip)
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return -ENODEV;
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if (len > TPM_DEV_BUFSIZE)
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return -E2BIG; /* Command is too long for our tpm, sorry */
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ret = tpm_tis_spi_request_locality(dev, 0);
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if (ret < 0)
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return -EBUSY;
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/*
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* Check if the TPM is ready. If not, if not, cancel the pending command
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* and poll on the status to be finally ready.
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*/
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ret = tpm_tis_spi_status(dev, &status);
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if (ret)
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return ret;
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if (!(status & TPM_STS_COMMAND_READY)) {
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/* Force the transition, usually this will be done at startup */
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ret = tpm_tis_spi_cancel(dev);
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if (ret) {
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log(LOGC_NONE, LOGL_ERR,
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"%s: Could not cancel previous operation\n",
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__func__);
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goto out_err;
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}
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ret = tpm_tis_spi_wait_for_stat(dev, TPM_STS_COMMAND_READY,
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chip->timeout_b, &status);
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if (ret < 0 || !(status & TPM_STS_COMMAND_READY)) {
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log(LOGC_NONE, LOGL_ERR,
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"status %d after wait for stat returned %d\n",
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status, ret);
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goto out_err;
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}
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}
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for (i = 0; i < len - 1;) {
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burstcnt = tpm_tis_spi_get_burstcount(dev);
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if (burstcnt < 0)
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return burstcnt;
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size = min_t(int, len - i - 1, burstcnt);
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ret = tpm_tis_spi_write(dev, TPM_DATA_FIFO(chip->locality),
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buf + i, size);
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if (ret < 0)
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goto out_err;
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i += size;
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}
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ret = tpm_tis_spi_valid_status(dev, &status);
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if (ret)
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goto out_err;
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if ((status & TPM_STS_DATA_EXPECT) == 0) {
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ret = -EIO;
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goto out_err;
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}
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ret = tpm_tis_spi_write(dev, TPM_DATA_FIFO(chip->locality),
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buf + len - 1, 1);
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if (ret)
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goto out_err;
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ret = tpm_tis_spi_valid_status(dev, &status);
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if (ret)
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goto out_err;
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if ((status & TPM_STS_DATA_EXPECT) != 0) {
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ret = -EIO;
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goto out_err;
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}
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data = TPM_STS_GO;
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ret = tpm_tis_spi_write(dev, TPM_STS(chip->locality), &data, 1);
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if (ret)
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goto out_err;
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return len;
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out_err:
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tpm_tis_spi_cancel(dev);
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tpm_tis_spi_release_locality(dev, chip->locality, false);
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return ret;
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}
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static int tpm_tis_spi_cleanup(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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tpm_tis_spi_cancel(dev);
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/*
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* The TPM needs some time to clean up here,
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* so we sleep rather than keeping the bus busy
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*/
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mdelay(2);
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tpm_tis_spi_release_locality(dev, chip->locality, false);
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return 0;
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}
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static int tpm_tis_spi_open(struct udevice *dev)
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{
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struct tpm_chip *chip = dev_get_priv(dev);
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struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
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if (chip->is_open)
|
|
return -EBUSY;
|
|
|
|
chip->is_open = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tpm_tis_spi_close(struct udevice *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_priv(dev);
|
|
|
|
if (chip->is_open) {
|
|
tpm_tis_spi_release_locality(dev, chip->locality, true);
|
|
chip->is_open = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tpm_tis_get_desc(struct udevice *dev, char *buf, int size)
|
|
{
|
|
struct tpm_chip *chip = dev_get_priv(dev);
|
|
|
|
if (size < 80)
|
|
return -ENOSPC;
|
|
|
|
return snprintf(buf, size,
|
|
"%s v2.0: VendorID 0x%04x, DeviceID 0x%04x, RevisionID 0x%02x [%s]",
|
|
dev->name, chip->vend_dev & 0xFFFF,
|
|
chip->vend_dev >> 16, chip->rid,
|
|
(chip->is_open ? "open" : "closed"));
|
|
}
|
|
|
|
static int tpm_tis_wait_init(struct udevice *dev, int loc)
|
|
{
|
|
struct tpm_chip *chip = dev_get_priv(dev);
|
|
unsigned long start, stop;
|
|
u8 status;
|
|
int ret;
|
|
|
|
start = get_timer(0);
|
|
stop = chip->timeout_b;
|
|
do {
|
|
mdelay(TPM_TIMEOUT_MS);
|
|
|
|
ret = tpm_tis_spi_read(dev, TPM_ACCESS(loc), &status, 1);
|
|
if (ret)
|
|
break;
|
|
|
|
if (status & TPM_ACCESS_VALID)
|
|
return 0;
|
|
} while (get_timer(start) < stop);
|
|
|
|
return -EIO;
|
|
}
|
|
|
|
static int tpm_tis_spi_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);
|
|
struct tpm_chip *chip = dev_get_priv(dev);
|
|
int ret;
|
|
|
|
/* Use the TPM v2 stack */
|
|
priv->version = TPM_V2;
|
|
|
|
if (IS_ENABLED(CONFIG_DM_GPIO)) {
|
|
struct gpio_desc reset_gpio;
|
|
|
|
ret = gpio_request_by_name(dev, "gpio-reset", 0,
|
|
&reset_gpio, GPIOD_IS_OUT);
|
|
if (ret) {
|
|
log(LOGC_NONE, LOGL_NOTICE, "%s: missing reset GPIO\n",
|
|
__func__);
|
|
} else {
|
|
dm_gpio_set_value(&reset_gpio, 1);
|
|
mdelay(1);
|
|
dm_gpio_set_value(&reset_gpio, 0);
|
|
}
|
|
}
|
|
|
|
/* Ensure a minimum amount of time elapsed since reset of the TPM */
|
|
mdelay(drv_data->time_before_first_cmd_ms);
|
|
|
|
chip->locality = 0;
|
|
chip->timeout_a = TIS_SHORT_TIMEOUT_MS;
|
|
chip->timeout_b = TIS_LONG_TIMEOUT_MS;
|
|
chip->timeout_c = TIS_SHORT_TIMEOUT_MS;
|
|
chip->timeout_d = TIS_SHORT_TIMEOUT_MS;
|
|
priv->pcr_count = drv_data->pcr_count;
|
|
priv->pcr_select_min = drv_data->pcr_select_min;
|
|
|
|
ret = tpm_tis_wait_init(dev, chip->locality);
|
|
if (ret) {
|
|
log(LOGC_DM, LOGL_ERR, "%s: no device found\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
ret = tpm_tis_spi_request_locality(dev, chip->locality);
|
|
if (ret) {
|
|
log(LOGC_NONE, LOGL_ERR, "%s: could not request locality %d\n",
|
|
__func__, chip->locality);
|
|
return ret;
|
|
}
|
|
|
|
ret = tpm_tis_spi_read32(dev, TPM_DID_VID(chip->locality),
|
|
&chip->vend_dev);
|
|
if (ret) {
|
|
log(LOGC_NONE, LOGL_ERR,
|
|
"%s: could not retrieve VendorID/DeviceID\n", __func__);
|
|
return ret;
|
|
}
|
|
|
|
ret = tpm_tis_spi_read(dev, TPM_RID(chip->locality), &chip->rid, 1);
|
|
if (ret) {
|
|
log(LOGC_NONE, LOGL_ERR, "%s: could not retrieve RevisionID\n",
|
|
__func__);
|
|
return ret;
|
|
}
|
|
|
|
log(LOGC_NONE, LOGL_ERR,
|
|
"SPI TPMv2.0 found (vid:%04x, did:%04x, rid:%02x)\n",
|
|
chip->vend_dev & 0xFFFF, chip->vend_dev >> 16, chip->rid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tpm_tis_spi_remove(struct udevice *dev)
|
|
{
|
|
struct tpm_chip *chip = dev_get_priv(dev);
|
|
|
|
tpm_tis_spi_release_locality(dev, chip->locality, true);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct tpm_ops tpm_tis_spi_ops = {
|
|
.open = tpm_tis_spi_open,
|
|
.close = tpm_tis_spi_close,
|
|
.get_desc = tpm_tis_get_desc,
|
|
.send = tpm_tis_spi_send,
|
|
.recv = tpm_tis_spi_recv,
|
|
.cleanup = tpm_tis_spi_cleanup,
|
|
};
|
|
|
|
static const struct tpm_tis_chip_data tpm_tis_std_chip_data = {
|
|
.pcr_count = 24,
|
|
.pcr_select_min = 3,
|
|
.time_before_first_cmd_ms = 30,
|
|
};
|
|
|
|
static const struct udevice_id tpm_tis_spi_ids[] = {
|
|
{
|
|
.compatible = "tis,tpm2-spi",
|
|
.data = (ulong)&tpm_tis_std_chip_data,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(tpm_tis_spi) = {
|
|
.name = "tpm_tis_spi",
|
|
.id = UCLASS_TPM,
|
|
.of_match = tpm_tis_spi_ids,
|
|
.ops = &tpm_tis_spi_ops,
|
|
.probe = tpm_tis_spi_probe,
|
|
.remove = tpm_tis_spi_remove,
|
|
.priv_auto_alloc_size = sizeof(struct tpm_chip),
|
|
};
|