Add the tpm2_tis_spi driver that should support any TPMv2 compliant (SPI) module. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>lime2-spi
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// 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 "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 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_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_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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if (chip->is_open) |
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return -EBUSY; |
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chip->is_open = 1; |
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return 0; |
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} |
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static int tpm_tis_spi_close(struct udevice *dev) |
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{ |
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struct tpm_chip *chip = dev_get_priv(dev); |
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if (chip->is_open) { |
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tpm_tis_spi_release_locality(dev, chip->locality, true); |
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chip->is_open = 0; |
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} |
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return 0; |
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} |
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static int tpm_tis_get_desc(struct udevice *dev, char *buf, int size) |
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{ |
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struct tpm_chip *chip = dev_get_priv(dev); |
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if (size < 80) |
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return -ENOSPC; |
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return snprintf(buf, size, |
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"%s v2.0: VendorID 0x%04x, DeviceID 0x%04x, RevisionID 0x%02x [%s]", |
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dev->name, chip->vend_dev & 0xFFFF, |
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chip->vend_dev >> 16, chip->rid, |
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(chip->is_open ? "open" : "closed")); |
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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); |
||||
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; |
||||
|
||||
/* 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), |
||||
}; |
Loading…
Reference in new issue