1 // SPDX-License-Identifier: GPL-2.0
6  * https://www.microsoft.com/en-us/research/publication/ftpm-software-implementation-tpm-chip/
9  * https://github.com/microsoft/ms-tpm-20-ref/tree/master/Samples/ARM32-FirmwareTPM/optee_ta/fTPM
23  * TA_FTPM_UUID: BC50D971-D4C9-42C4-82CB-343FB7F37896
27 …* https://github.com/microsoft/ms-tpm-20-ref/blob/master/Samples/ARM32-FirmwareTPM/optee_ta/fTPM/i…
34  * ftpm_tee_tpm_op_recv() - retrieve fTPM response.
41  *	On failure, -errno.
45 	struct ftpm_tee_private *pvt_data = dev_get_drvdata(chip->dev.parent);  in ftpm_tee_tpm_op_recv()
48 	len = pvt_data->resp_len;  in ftpm_tee_tpm_op_recv()
50 		dev_err(&chip->dev,  in ftpm_tee_tpm_op_recv()
53 		return -EIO;  in ftpm_tee_tpm_op_recv()
56 	memcpy(buf, pvt_data->resp_buf, len);  in ftpm_tee_tpm_op_recv()
57 	pvt_data->resp_len = 0;  in ftpm_tee_tpm_op_recv()
63  * ftpm_tee_tpm_op_send() - send TPM commands through the TEE shared memory.
70  *	On failure, -errno
74 	struct ftpm_tee_private *pvt_data = dev_get_drvdata(chip->dev.parent);  in ftpm_tee_tpm_op_send()
81 	struct tee_shm *shm = pvt_data->shm;  in ftpm_tee_tpm_op_send()
84 		dev_err(&chip->dev,  in ftpm_tee_tpm_op_send()
87 		return -EIO;  in ftpm_tee_tpm_op_send()
92 	pvt_data->resp_len = 0;  in ftpm_tee_tpm_op_send()
97 		.session = pvt_data->session,  in ftpm_tee_tpm_op_send()
113 		dev_err(&chip->dev, "%s: tee_shm_get_va failed for transmit\n",  in ftpm_tee_tpm_op_send()
129 	rc = tee_client_invoke_func(pvt_data->ctx, &transceive_args,  in ftpm_tee_tpm_op_send()
132 		dev_err(&chip->dev, "%s: SUBMIT_COMMAND invoke error: 0x%x\n",  in ftpm_tee_tpm_op_send()
139 		dev_err(&chip->dev, "%s: tee_shm_get_va failed for receive\n",  in ftpm_tee_tpm_op_send()
145 	resp_len = be32_to_cpu(resp_header->length);  in ftpm_tee_tpm_op_send()
149 		dev_err(&chip->dev, "%s: tpm response header too small\n",  in ftpm_tee_tpm_op_send()
151 		return -EIO;  in ftpm_tee_tpm_op_send()
154 		dev_err(&chip->dev,  in ftpm_tee_tpm_op_send()
157 		return -EIO;  in ftpm_tee_tpm_op_send()
161 	memcpy(pvt_data->resp_buf, temp_buf, resp_len);  in ftpm_tee_tpm_op_send()
162 	pvt_data->resp_len = resp_len;  in ftpm_tee_tpm_op_send()
202 	if ((ver->impl_id == TEE_IMPL_ID_OPTEE) &&  in ftpm_tee_match()
203 		(ver->gen_caps & TEE_GEN_CAP_GP))  in ftpm_tee_match()
210  * ftpm_tee_probe() - initialize the fTPM
214  *	On success, 0. On failure, -errno.
226 		return -ENOMEM;  in ftpm_tee_probe()
231 	pvt_data->ctx = tee_client_open_context(NULL, ftpm_tee_match, NULL,  in ftpm_tee_probe()
233 	if (IS_ERR(pvt_data->ctx)) {  in ftpm_tee_probe()
234 		if (PTR_ERR(pvt_data->ctx) == -ENOENT)  in ftpm_tee_probe()
235 			return -EPROBE_DEFER;  in ftpm_tee_probe()
237 		return PTR_ERR(pvt_data->ctx);  in ftpm_tee_probe()
246 	rc = tee_client_open_session(pvt_data->ctx, &sess_arg, NULL);  in ftpm_tee_probe()
250 		rc = -EINVAL;  in ftpm_tee_probe()
253 	pvt_data->session = sess_arg.session;  in ftpm_tee_probe()
256 	pvt_data->shm = tee_shm_alloc_kernel_buf(pvt_data->ctx,  in ftpm_tee_probe()
259 	if (IS_ERR(pvt_data->shm)) {  in ftpm_tee_probe()
261 		rc = -ENOMEM;  in ftpm_tee_probe()
273 	pvt_data->chip = chip;  in ftpm_tee_probe()
274 	pvt_data->chip->flags |= TPM_CHIP_FLAG_TPM2;  in ftpm_tee_probe()
277 	rc = tpm_chip_register(pvt_data->chip);  in ftpm_tee_probe()
287 	put_device(&pvt_data->chip->dev);  in ftpm_tee_probe()
289 	tee_shm_free(pvt_data->shm);  in ftpm_tee_probe()
291 	tee_client_close_session(pvt_data->ctx, pvt_data->session);  in ftpm_tee_probe()
293 	tee_client_close_context(pvt_data->ctx);  in ftpm_tee_probe()
300 	struct device *dev = &pdev->dev;  in ftpm_plat_tee_probe()
306  * ftpm_tee_remove() - remove the TPM device
317 	tpm_chip_unregister(pvt_data->chip);  in ftpm_tee_remove()
320 	put_device(&pvt_data->chip->dev);  in ftpm_tee_remove()
323 	tee_shm_free(pvt_data->shm);  in ftpm_tee_remove()
326 	tee_client_close_session(pvt_data->ctx, pvt_data->session);  in ftpm_tee_remove()
329 	tee_client_close_context(pvt_data->ctx);  in ftpm_tee_remove()
338 	struct device *dev = &pdev->dev;  in ftpm_plat_tee_remove()
344  * ftpm_plat_tee_shutdown() - shutdown the TPM device
349 	struct ftpm_tee_private *pvt_data = dev_get_drvdata(&pdev->dev);  in ftpm_plat_tee_shutdown()
351 	tee_shm_free(pvt_data->shm);  in ftpm_plat_tee_shutdown()
352 	tee_client_close_session(pvt_data->ctx, pvt_data->session);  in ftpm_plat_tee_shutdown()
353 	tee_client_close_context(pvt_data->ctx);  in ftpm_plat_tee_shutdown()
364 		.name = "ftpm-tee",
384 		.name		= "optee-ftpm",