mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-10 23:24:38 +00:00
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>
132 lines
2.9 KiB
C
132 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2015 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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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 <linux/unaligned/be_byteshift.h>
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#include "tpm_internal.h"
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int tpm_open(struct udevice *dev)
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{
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struct tpm_ops *ops = tpm_get_ops(dev);
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if (!ops->open)
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return -ENOSYS;
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return ops->open(dev);
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}
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int tpm_close(struct udevice *dev)
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{
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struct tpm_ops *ops = tpm_get_ops(dev);
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if (!ops->close)
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return -ENOSYS;
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return ops->close(dev);
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}
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int tpm_get_desc(struct udevice *dev, char *buf, int size)
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{
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struct tpm_ops *ops = tpm_get_ops(dev);
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if (!ops->get_desc)
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return -ENOSYS;
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return ops->get_desc(dev, buf, size);
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}
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/* Returns max number of milliseconds to wait */
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static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
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u32 ordinal)
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{
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int duration_idx = TPM_UNDEFINED;
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int duration = 0;
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if (ordinal < TPM_MAX_ORDINAL) {
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duration_idx = tpm_ordinal_duration[ordinal];
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} else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
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TPM_MAX_PROTECTED_ORDINAL) {
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duration_idx = tpm_protected_ordinal_duration[
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ordinal & TPM_PROTECTED_ORDINAL_MASK];
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}
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if (duration_idx != TPM_UNDEFINED)
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duration = priv->duration_ms[duration_idx];
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if (duration <= 0)
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return 2 * 60 * 1000; /* Two minutes timeout */
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else
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return duration;
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}
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int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
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uint8_t *recvbuf, size_t *recv_size)
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{
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struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
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struct tpm_ops *ops = tpm_get_ops(dev);
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ulong start, stop;
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uint count, ordinal;
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int ret, ret2;
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if (ops->xfer)
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return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);
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if (!ops->send || !ops->recv)
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return -ENOSYS;
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/* switch endianess: big->little */
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count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
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ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);
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if (count == 0) {
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debug("no data\n");
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return -ENODATA;
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}
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if (count > send_size) {
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debug("invalid count value %x %zx\n", count, send_size);
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return -E2BIG;
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}
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debug("%s: Calling send\n", __func__);
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ret = ops->send(dev, sendbuf, send_size);
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if (ret < 0)
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return ret;
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start = get_timer(0);
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stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
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do {
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ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
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if (ret >= 0) {
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if (ret > *recv_size)
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return -ENOSPC;
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memcpy(recvbuf, priv->buf, ret);
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*recv_size = ret;
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ret = 0;
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break;
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} else if (ret != -EAGAIN) {
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return ret;
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}
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mdelay(priv->retry_time_ms);
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if (get_timer(start) > stop) {
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ret = -ETIMEDOUT;
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break;
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}
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} while (ret);
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ret2 = ops->cleanup ? ops->cleanup(dev) : 0;
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return ret2 ? ret2 : ret;
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}
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UCLASS_DRIVER(tpm) = {
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.id = UCLASS_TPM,
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.name = "tpm",
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.flags = DM_UC_FLAG_SEQ_ALIAS,
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.per_device_auto_alloc_size = sizeof(struct tpm_chip_priv),
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};
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