[people/ms/u-boot.git] / drivers / tpm / tpm-uclass.c

/*
 * Copyright (c) 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <tpm.h>
#include <linux/unaligned/be_byteshift.h>
#include "tpm_internal.h"

int tpm_open(struct udevice *dev)
{
	struct tpm_ops *ops = tpm_get_ops(dev);

	if (!ops->open)
		return -ENOSYS;

	return ops->open(dev);
}

int tpm_close(struct udevice *dev)
{
	struct tpm_ops *ops = tpm_get_ops(dev);

	if (!ops->close)
		return -ENOSYS;

	return ops->close(dev);
}

int tpm_get_desc(struct udevice *dev, char *buf, int size)
{
	struct tpm_ops *ops = tpm_get_ops(dev);

	if (!ops->get_desc)
		return -ENOSYS;

	return ops->get_desc(dev, buf, size);
}

/* Returns max number of milliseconds to wait */
static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
					       u32 ordinal)
{
	int duration_idx = TPM_UNDEFINED;
	int duration = 0;

	if (ordinal < TPM_MAX_ORDINAL) {
		duration_idx = tpm_ordinal_duration[ordinal];
	} else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
			TPM_MAX_PROTECTED_ORDINAL) {
		duration_idx = tpm_protected_ordinal_duration[
				ordinal & TPM_PROTECTED_ORDINAL_MASK];
	}

	if (duration_idx != TPM_UNDEFINED)
		duration = priv->duration_ms[duration_idx];

	if (duration <= 0)
		return 2 * 60 * 1000; /* Two minutes timeout */
	else
		return duration;
}

int tpm_xfer(struct udevice *dev, const uint8_t *sendbuf, size_t send_size,
	uint8_t *recvbuf, size_t *recv_size)
{
	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
	struct tpm_ops *ops = tpm_get_ops(dev);
	ulong start, stop;
	uint count, ordinal;
	int ret, ret2;

	if (ops->xfer)
		return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);

	if (!ops->send || !ops->recv)
		return -ENOSYS;

	/* switch endianess: big->little */
	count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
	ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);

	if (count == 0) {
		debug("no data\n");
		return -ENODATA;
	}
	if (count > send_size) {
		debug("invalid count value %x %zx\n", count, send_size);
		return -E2BIG;
	}

	debug("%s: Calling send\n", __func__);
	ret = ops->send(dev, sendbuf, send_size);
	if (ret < 0)
		return ret;

	start = get_timer(0);
	stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
	do {
		ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
		if (ret >= 0) {
			if (ret > *recv_size)
				return -ENOSPC;
			memcpy(recvbuf, priv->buf, ret);
			*recv_size = ret;
			ret = 0;
			break;
		} else if (ret != -EAGAIN) {
			return ret;
		}

		mdelay(priv->retry_time_ms);
		if (get_timer(start) > stop) {
			ret = -ETIMEDOUT;
			break;
		}
	} while (ret);

	ret2 = ops->cleanup ? ops->cleanup(dev) : 0;

	return ret2 ? ret2 : ret;
}

UCLASS_DRIVER(tpm) = {
	.id             = UCLASS_TPM,
	.name           = "tpm",
	.flags          = DM_UC_FLAG_SEQ_ALIAS,
	.per_device_auto_alloc_size	= sizeof(struct tpm_chip_priv),
};
Commit	Line	Data
f255d31f SG	1	/*
	2	* Copyright (c) 2015 Google, Inc
	3	* Written by Simon Glass <sjg@chromium.org>
	4	*
	5	* SPDX-License-Identifier: GPL-2.0+
	6	*/
	7
	8	#include <common.h>
	9	#include <dm.h>
	10	#include <tpm.h>
	11	#include <linux/unaligned/be_byteshift.h>
	12	#include "tpm_internal.h"
	13
	14	int tpm_open(struct udevice *dev)
	15	{
	16	struct tpm_ops *ops = tpm_get_ops(dev);
	17
	18	if (!ops->open)
	19	return -ENOSYS;
	20
	21	return ops->open(dev);
	22	}
	23
	24	int tpm_close(struct udevice *dev)
	25	{
	26	struct tpm_ops *ops = tpm_get_ops(dev);
	27
	28	if (!ops->close)
	29	return -ENOSYS;
	30
	31	return ops->close(dev);
	32	}
	33
	34	int tpm_get_desc(struct udevice dev, char buf, int size)
	35	{
	36	struct tpm_ops *ops = tpm_get_ops(dev);
	37
	38	if (!ops->get_desc)
	39	return -ENOSYS;
	40
	41	return ops->get_desc(dev, buf, size);
	42	}
	43
	44	/* Returns max number of milliseconds to wait */
	45	static ulong tpm_tis_i2c_calc_ordinal_duration(struct tpm_chip_priv *priv,
	46	u32 ordinal)
	47	{
	48	int duration_idx = TPM_UNDEFINED;
	49	int duration = 0;
	50
	51	if (ordinal < TPM_MAX_ORDINAL) {
	52	duration_idx = tpm_ordinal_duration[ordinal];
	53	} else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
	54	TPM_MAX_PROTECTED_ORDINAL) {
	55	duration_idx = tpm_protected_ordinal_duration[
	56	ordinal & TPM_PROTECTED_ORDINAL_MASK];
	57	}
	58
	59	if (duration_idx != TPM_UNDEFINED)
	60	duration = priv->duration_ms[duration_idx];
	61
	62	if (duration <= 0)
	63	return 2 * 60 * 1000; /* Two minutes timeout */
	64	else
65	return duration;
66	}
67
68	int tpm_xfer(struct udevice dev, const uint8_t sendbuf, size_t send_size,
69	uint8_t recvbuf, size_t recv_size)
70	{
71	struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
72	struct tpm_ops *ops = tpm_get_ops(dev);
73	ulong start, stop;
74	uint count, ordinal;
75	int ret, ret2;
76
77	if (ops->xfer)
78	return ops->xfer(dev, sendbuf, send_size, recvbuf, recv_size);
79
80	if (!ops->send \|\| !ops->recv)
81	return -ENOSYS;
82
83	/* switch endianess: big->little */
84	count = get_unaligned_be32(sendbuf + TPM_CMD_COUNT_BYTE);
85	ordinal = get_unaligned_be32(sendbuf + TPM_CMD_ORDINAL_BYTE);
86
87	if (count == 0) {
88	debug("no data\n");
89	return -ENODATA;
90	}
91	if (count > send_size) {
92	debug("invalid count value %x %zx\n", count, send_size);
93	return -E2BIG;
94	}
95
96	debug("%s: Calling send\n", __func__);
97	ret = ops->send(dev, sendbuf, send_size);
98	if (ret < 0)
99	return ret;
100
101	start = get_timer(0);
102	stop = tpm_tis_i2c_calc_ordinal_duration(priv, ordinal);
103	do {
104	ret = ops->recv(dev, priv->buf, sizeof(priv->buf));
105	if (ret >= 0) {
106	if (ret > *recv_size)
107	return -ENOSPC;
108	memcpy(recvbuf, priv->buf, ret);
109	*recv_size = ret;
110	ret = 0;
111	break;
112	} else if (ret != -EAGAIN) {
113	return ret;
114	}
115
116	mdelay(priv->retry_time_ms);
117	if (get_timer(start) > stop) {
118	ret = -ETIMEDOUT;
119	break;
120	}
121	} while (ret);
122
123	ret2 = ops->cleanup ? ops->cleanup(dev) : 0;
124
125	return ret2 ? ret2 : ret;
126	}
127
128	UCLASS_DRIVER(tpm) = {
129	.id = UCLASS_TPM,
130	.name = "tpm",
131	.flags = DM_UC_FLAG_SEQ_ALIAS,
132	.per_device_auto_alloc_size = sizeof(struct tpm_chip_priv),
133	};