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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
146 lines
3.1 KiB
C
146 lines
3.1 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 <log.h>
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#include <linux/delay.h>
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#include <linux/unaligned/be_byteshift.h>
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#include <tpm-v1.h>
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#include <tpm-v2.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 = 0;
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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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if (ret) {
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if (ops->cleanup) {
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ret2 = ops->cleanup(dev);
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if (ret2)
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return log_msg_ret("cleanup", ret2);
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}
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return log_msg_ret("xfer", ret);
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}
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return 0;
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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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#if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
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.post_bind = dm_scan_fdt_dev,
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#endif
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.per_device_auto = sizeof(struct tpm_chip_priv),
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};
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