mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-07 19:56:18 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
167 lines
3.7 KiB
C
167 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2013 Guntermann & Drunck, GmbH
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*
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* Written by Dirk Eibach <dirk.eibach@gdsys.cc>
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*/
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#include <common.h>
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#include <dm.h>
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#include <tpm.h>
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#include <i2c.h>
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#include <asm/unaligned.h>
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#include "tpm_internal.h"
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#define ATMEL_TPM_TIMEOUT_MS 5000 /* sufficient for anything but
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generating/exporting keys */
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/*
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* tpm_atmel_twi_open()
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*
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* Requests access to locality 0 for the caller. After all commands have been
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* completed the caller is supposed to call tis_close().
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*
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* Returns 0 on success, -1 on failure.
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*/
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static int tpm_atmel_twi_open(struct udevice *dev)
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{
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return 0;
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}
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/*
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* tpm_atmel_twi_close()
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*
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* terminate the currect session with the TPM by releasing the locked
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* locality. Returns 0 on success of -1 on failure (in case lock
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* removal did not succeed).
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*/
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static int tpm_atmel_twi_close(struct udevice *dev)
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{
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return 0;
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}
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/*
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* tpm_atmel_twi_get_desc()
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*
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* @dev: Device to check
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* @buf: Buffer to put the string
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* @size: Maximum size of buffer
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* @return length of string, or -ENOSPC it no space
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*/
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static int tpm_atmel_twi_get_desc(struct udevice *dev, char *buf, int size)
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{
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return 0;
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}
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/*
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* tpm_atmel_twi_xfer()
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*
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* Send the requested data to the TPM and then try to get its response
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*
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* @sendbuf - buffer of the data to send
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* @send_size size of the data to send
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* @recvbuf - memory to save the response to
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* @recv_len - pointer to the size of the response buffer
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*
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* Returns 0 on success (and places the number of response bytes at recv_len)
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* or -1 on failure.
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*/
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static int tpm_atmel_twi_xfer(struct udevice *dev,
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const uint8_t *sendbuf, size_t send_size,
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uint8_t *recvbuf, size_t *recv_len)
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{
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int res;
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unsigned long start;
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#ifdef DEBUG
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memset(recvbuf, 0xcc, *recv_len);
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printf("send to TPM (%d bytes, recv_len=%d):\n", send_size, *recv_len);
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print_buffer(0, (void *)sendbuf, 1, send_size, 0);
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#endif
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#ifndef CONFIG_DM_I2C
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res = i2c_write(0x29, 0, 0, (uchar *)sendbuf, send_size);
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#else
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res = dm_i2c_write(dev, 0, sendbuf, send_size);
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#endif
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if (res) {
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printf("i2c_write returned %d\n", res);
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return -1;
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}
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start = get_timer(0);
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#ifndef CONFIG_DM_I2C
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while ((res = i2c_read(0x29, 0, 0, recvbuf, 10)))
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#else
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while ((res = dm_i2c_read(dev, 0, recvbuf, 10)))
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#endif
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{
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/* TODO Use TIS_TIMEOUT from tpm_tis_infineon.h */
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if (get_timer(start) > ATMEL_TPM_TIMEOUT_MS) {
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puts("tpm timed out\n");
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return -1;
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}
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udelay(100);
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}
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if (!res) {
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unsigned int hdr_recv_len;
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hdr_recv_len = get_unaligned_be32(recvbuf + 2);
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if (hdr_recv_len < 10) {
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puts("tpm response header too small\n");
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return -1;
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} else if (hdr_recv_len > *recv_len) {
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puts("tpm response length is bigger than receive buffer\n");
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return -1;
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} else {
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*recv_len = hdr_recv_len;
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#ifndef CONFIG_DM_I2C
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res = i2c_read(0x29, 0, 0, recvbuf, *recv_len);
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#else
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res = dm_i2c_read(dev, 0, recvbuf, *recv_len);
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#endif
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}
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}
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if (res) {
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printf("i2c_read returned %d (rlen=%d)\n", res, *recv_len);
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#ifdef DEBUG
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print_buffer(0, recvbuf, 1, *recv_len, 0);
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#endif
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}
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#ifdef DEBUG
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if (!res) {
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printf("read from TPM (%d bytes):\n", *recv_len);
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print_buffer(0, recvbuf, 1, *recv_len, 0);
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}
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#endif
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return res;
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}
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static int tpm_atmel_twi_probe(struct udevice *dev)
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{
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return 0;
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}
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static const struct udevice_id tpm_atmel_twi_ids[] = {
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{ .compatible = "atmel,at97sc3204t"},
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{ }
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};
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static const struct tpm_ops tpm_atmel_twi_ops = {
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.open = tpm_atmel_twi_open,
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.close = tpm_atmel_twi_close,
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.xfer = tpm_atmel_twi_xfer,
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.get_desc = tpm_atmel_twi_get_desc,
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};
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U_BOOT_DRIVER(tpm_atmel_twi) = {
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.name = "tpm_atmel_twi",
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.id = UCLASS_TPM,
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.of_match = tpm_atmel_twi_ids,
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.ops = &tpm_atmel_twi_ops,
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.probe = tpm_atmel_twi_probe,
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};
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