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path: root/drivers/tpm/tpm-uclass.c
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Diffstat (limited to 'drivers/tpm/tpm-uclass.c')
-rw-r--r--drivers/tpm/tpm-uclass.c133
1 files changed, 133 insertions, 0 deletions
diff --git a/drivers/tpm/tpm-uclass.c b/drivers/tpm/tpm-uclass.c
new file mode 100644
index 0000000000..b6e1fc5e62
--- /dev/null
+++ b/drivers/tpm/tpm-uclass.c
@@ -0,0 +1,133 @@
+/*
+ * 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),
+};