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_send() - send TPM commands through the TEE shared memory
43  *	On failure, -errno
48 	struct ftpm_tee_private *pvt_data = dev_get_drvdata(chip->dev.parent);  in ftpm_tee_tpm_op_send()
55 	struct tee_shm *shm = pvt_data->shm;  in ftpm_tee_tpm_op_send()
58 		dev_err(&chip->dev,  in ftpm_tee_tpm_op_send()
61 		return -EIO;  in ftpm_tee_tpm_op_send()
70 		.session = pvt_data->session,  in ftpm_tee_tpm_op_send()
86 		dev_err(&chip->dev, "%s: tee_shm_get_va failed for transmit\n",  in ftpm_tee_tpm_op_send()
102 	rc = tee_client_invoke_func(pvt_data->ctx, &transceive_args,  in ftpm_tee_tpm_op_send()
105 		dev_err(&chip->dev, "%s: SUBMIT_COMMAND invoke error: 0x%x\n",  in ftpm_tee_tpm_op_send()
112 		dev_err(&chip->dev, "%s: tee_shm_get_va failed for receive\n",  in ftpm_tee_tpm_op_send()
118 	resp_len = be32_to_cpu(resp_header->length);  in ftpm_tee_tpm_op_send()
122 		dev_err(&chip->dev, "%s: tpm response header too small\n",  in ftpm_tee_tpm_op_send()
124 		return -EIO;  in ftpm_tee_tpm_op_send()
127 		dev_err(&chip->dev,  in ftpm_tee_tpm_op_send()
130 		return -EIO;  in ftpm_tee_tpm_op_send()
133 		dev_err(&chip->dev,  in ftpm_tee_tpm_op_send()
136 		return -EIO;  in ftpm_tee_tpm_op_send()
158 	if ((ver->impl_id == TEE_IMPL_ID_OPTEE) &&  in ftpm_tee_match()
159 		(ver->gen_caps & TEE_GEN_CAP_GP))  in ftpm_tee_match()
166  * ftpm_tee_probe() - initialize the fTPM
170  *	On success, 0. On failure, -errno.
182 		return -ENOMEM;  in ftpm_tee_probe()
187 	pvt_data->ctx = tee_client_open_context(NULL, ftpm_tee_match, NULL,  in ftpm_tee_probe()
189 	if (IS_ERR(pvt_data->ctx)) {  in ftpm_tee_probe()
190 		if (PTR_ERR(pvt_data->ctx) == -ENOENT)  in ftpm_tee_probe()
191 			return -EPROBE_DEFER;  in ftpm_tee_probe()
193 		return PTR_ERR(pvt_data->ctx);  in ftpm_tee_probe()
202 	rc = tee_client_open_session(pvt_data->ctx, &sess_arg, NULL);  in ftpm_tee_probe()
206 		rc = -EINVAL;  in ftpm_tee_probe()
209 	pvt_data->session = sess_arg.session;  in ftpm_tee_probe()
212 	pvt_data->shm = tee_shm_alloc_kernel_buf(pvt_data->ctx,  in ftpm_tee_probe()
215 	if (IS_ERR(pvt_data->shm)) {  in ftpm_tee_probe()
217 		rc = -ENOMEM;  in ftpm_tee_probe()
229 	pvt_data->chip = chip;  in ftpm_tee_probe()
230 	pvt_data->chip->flags |= TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_SYNC;  in ftpm_tee_probe()
233 	rc = tpm_chip_register(pvt_data->chip);  in ftpm_tee_probe()
243 	put_device(&pvt_data->chip->dev);  in ftpm_tee_probe()
245 	tee_shm_free(pvt_data->shm);  in ftpm_tee_probe()
247 	tee_client_close_session(pvt_data->ctx, pvt_data->session);  in ftpm_tee_probe()
249 	tee_client_close_context(pvt_data->ctx);  in ftpm_tee_probe()
256 	struct device *dev = &pdev->dev;  in ftpm_plat_tee_probe()
262  * ftpm_tee_remove() - remove the TPM device
273 	tpm_chip_unregister(pvt_data->chip);  in ftpm_tee_remove()
276 	put_device(&pvt_data->chip->dev);  in ftpm_tee_remove()
279 	tee_shm_free(pvt_data->shm);  in ftpm_tee_remove()
282 	tee_client_close_session(pvt_data->ctx, pvt_data->session);  in ftpm_tee_remove()
285 	tee_client_close_context(pvt_data->ctx);  in ftpm_tee_remove()
294 	struct device *dev = &pdev->dev;  in ftpm_plat_tee_remove()
300  * ftpm_plat_tee_shutdown() - shutdown the TPM device
305 	struct ftpm_tee_private *pvt_data = dev_get_drvdata(&pdev->dev);  in ftpm_plat_tee_shutdown()
307 	tee_shm_free(pvt_data->shm);  in ftpm_plat_tee_shutdown()
308 	tee_client_close_session(pvt_data->ctx, pvt_data->session);  in ftpm_plat_tee_shutdown()
309 	tee_client_close_context(pvt_data->ctx);  in ftpm_plat_tee_shutdown()
320 		.name = "ftpm-tee",
340 		.name		= "optee-ftpm",