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185f812c41
Sphinx expects Return: and not @return to indicate a return value. find . -name '*.c' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; find . -name '*.h' -exec \ sed -i 's/^\(\s\)\*\(\s*\)@return\(\s\)/\1*\2Return:\3/' {} \; Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
312 lines
7 KiB
C
312 lines
7 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/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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#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, u32 addr, u16 len, u8 *in)
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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, sizeof(u32), (u8 *)&result_le);
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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, u32 addr, u16 len, const u8 *out)
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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_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_spi_write(dev, addr, sizeof(value), (u8 *)&value_le);
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}
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static int tpm_tis_wait_init(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 status;
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int ret;
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start = get_timer(0);
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stop = chip->timeout_b;
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do {
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mdelay(TPM_TIMEOUT_MS);
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ret = tpm_tis_spi_read(dev, TPM_ACCESS(loc), 1, &status);
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if (ret)
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break;
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if (status & TPM_ACCESS_VALID)
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return 0;
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} while (get_timer(start) < stop);
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return -EIO;
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}
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static struct tpm_tis_phy_ops phy_ops = {
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.read_bytes = tpm_tis_spi_read,
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.write_bytes = tpm_tis_spi_write,
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.read32 = tpm_tis_spi_read32,
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.write32 = tpm_tis_spi_write32,
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};
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static int tpm_tis_spi_probe(struct udevice *dev)
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{
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struct tpm_tis_chip_data *drv_data = (void *)dev_get_driver_data(dev);
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struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
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struct tpm_chip *chip = dev_get_priv(dev);
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int ret;
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/* Use the TPM v2 stack */
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priv->version = TPM_V2;
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if (CONFIG_IS_ENABLED(DM_GPIO)) {
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struct gpio_desc reset_gpio;
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ret = gpio_request_by_name(dev, "reset-gpios", 0,
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&reset_gpio, GPIOD_IS_OUT);
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if (ret) {
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/* legacy reset */
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ret = gpio_request_by_name(dev, "gpio-reset", 0,
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&reset_gpio, GPIOD_IS_OUT);
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if (ret) {
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log(LOGC_NONE, LOGL_NOTICE,
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"%s: missing reset GPIO\n", __func__);
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goto init;
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}
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log(LOGC_NONE, LOGL_NOTICE,
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"%s: gpio-reset is deprecated\n", __func__);
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}
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dm_gpio_set_value(&reset_gpio, 1);
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mdelay(1);
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dm_gpio_set_value(&reset_gpio, 0);
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}
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init:
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/* Ensure a minimum amount of time elapsed since reset of the TPM */
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mdelay(drv_data->time_before_first_cmd_ms);
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ret = tpm_tis_wait_init(dev, chip->locality);
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if (ret) {
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log(LOGC_DM, LOGL_ERR, "%s: no device found\n", __func__);
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return ret;
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}
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tpm_tis_ops_register(dev, &phy_ops);
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ret = tpm_tis_init(dev);
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if (ret)
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goto err;
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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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err:
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return -EINVAL;
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}
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static int tpm_tis_spi_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_spi_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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.time_before_first_cmd_ms = 30,
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};
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static const struct udevice_id tpm_tis_spi_ids[] = {
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{
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.compatible = "tcg,tpm_tis-spi",
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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_spi) = {
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.name = "tpm_tis_spi",
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.id = UCLASS_TPM,
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.of_match = tpm_tis_spi_ids,
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.ops = &tpm_tis_spi_ops,
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.probe = tpm_tis_spi_probe,
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.remove = tpm_tis_spi_remove,
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.priv_auto = sizeof(struct tpm_chip),
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};
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