1 // SPDX-License-Identifier: GPL-2.0-only
7  * Interface Over FF-A (DEN0138).
29 /* version encoding */
42  * defined in FF-A specification:
46  * w3-w7: Implementation defined, free to be used below
50  * Returns the version of the interface that is available
54  * w5-w7: Reserved (MBZ)
59  * w5:    TPM service interface version
60  *        Bits[31:16]: major version
61  *        Bits[15:0]: minor version
62  * w6-w7: Reserved (MBZ)
65  *     CRB_FFA_OK_RESULTS_RETURNED: The version of the interface has been
81  *            -If the start function qualifier is 0, identifies the locality
83  *            -If the start function qualifier is 1, identifies the locality
85  * w6-w7: Reserved (MBZ)
90  * w5-w7: Reserved (MBZ)
106 	/* lock to protect sending of FF-A messages: */
125 		rc = -ENOENT;  in tpm_crb_ffa_to_linux_errno()
128 		rc = -EPERM;  in tpm_crb_ffa_to_linux_errno()
131 		rc = -EINVAL;  in tpm_crb_ffa_to_linux_errno()
134 		rc = -ENOEXEC;  in tpm_crb_ffa_to_linux_errno()
137 		rc = -EEXIST;  in tpm_crb_ffa_to_linux_errno()
140 		rc = -EACCES;  in tpm_crb_ffa_to_linux_errno()
143 		rc = -ENOMEM;  in tpm_crb_ffa_to_linux_errno()
146 		rc = -EINVAL;  in tpm_crb_ffa_to_linux_errno()
153  * tpm_crb_ffa_init - called by the CRB driver to do any needed initialization
157  * yet, returns -ENOENT in order to force a retry.  If th ffa_crb
158  * driver had been probed  but failed with an error, returns -ENODEV
166 		return -ENOENT;  in tpm_crb_ffa_init()
169 		return -ENODEV;  in tpm_crb_ffa_init()
184 		return -ENOENT;  in __tpm_crb_ffa_send_recieve()
186 	msg_ops = tpm_crb_ffa->ffa_dev->ops->msg_ops;  in __tpm_crb_ffa_send_recieve()
188 	memset(&tpm_crb_ffa->direct_msg_data, 0x00,  in __tpm_crb_ffa_send_recieve()
191 	tpm_crb_ffa->direct_msg_data.data1 = func_id;  in __tpm_crb_ffa_send_recieve()
192 	tpm_crb_ffa->direct_msg_data.data2 = a0;  in __tpm_crb_ffa_send_recieve()
193 	tpm_crb_ffa->direct_msg_data.data3 = a1;  in __tpm_crb_ffa_send_recieve()
194 	tpm_crb_ffa->direct_msg_data.data4 = a2;  in __tpm_crb_ffa_send_recieve()
196 	ret = msg_ops->sync_send_receive(tpm_crb_ffa->ffa_dev,  in __tpm_crb_ffa_send_recieve()
197 			&tpm_crb_ffa->direct_msg_data);  in __tpm_crb_ffa_send_recieve()
199 		ret = tpm_crb_ffa_to_linux_errno(tpm_crb_ffa->direct_msg_data.data1);  in __tpm_crb_ffa_send_recieve()
205  * tpm_crb_ffa_get_interface_version() - gets the ABI version of the TPM service
206  * @major: Pointer to caller-allocated buffer to hold the major version
208  * @minor: Pointer to caller-allocated buffer to hold the minor version
211  * Returns the major and minor version of the ABI of the FF-A based TPM.
212  * Allows the caller to evaluate its compatibility with the version of
217 int tpm_crb_ffa_get_interface_version(u16 *major, u16 *minor)  in tpm_crb_ffa_get_interface_version()  argument
222 		return -ENOENT;  in tpm_crb_ffa_get_interface_version()
225 		return -ENODEV;  in tpm_crb_ffa_get_interface_version()
227 	if (!major || !minor)  in tpm_crb_ffa_get_interface_version()
228 		return -EINVAL;  in tpm_crb_ffa_get_interface_version()
230 	guard(mutex)(&tpm_crb_ffa->msg_data_lock);  in tpm_crb_ffa_get_interface_version()
234 		*major = CRB_FFA_MAJOR_VERSION(tpm_crb_ffa->direct_msg_data.data2);  in tpm_crb_ffa_get_interface_version()
235 		*minor = CRB_FFA_MINOR_VERSION(tpm_crb_ffa->direct_msg_data.data2);  in tpm_crb_ffa_get_interface_version()
243  * tpm_crb_ffa_start() - signals the TPM that a field has changed in the CRB
258 		return -ENOENT;  in tpm_crb_ffa_start()
261 		return -ENODEV;  in tpm_crb_ffa_start()
263 	guard(mutex)(&tpm_crb_ffa->msg_data_lock);  in tpm_crb_ffa_start()
276 		return -EEXIST;  in tpm_crb_ffa_probe()
278 	tpm_crb_ffa = ERR_PTR(-ENODEV); // set tpm_crb_ffa so we can detect probe failure  in tpm_crb_ffa_probe()
282 		return -EINVAL;  in tpm_crb_ffa_probe()
287 		return -ENOMEM;  in tpm_crb_ffa_probe()
290 	mutex_init(&tpm_crb_ffa->msg_data_lock);  in tpm_crb_ffa_probe()
291 	tpm_crb_ffa->ffa_dev = ffa_dev;  in tpm_crb_ffa_probe()
294 	/* if TPM is aarch32 use 32-bit SMCs */  in tpm_crb_ffa_probe()
296 		ffa_dev->ops->msg_ops->mode_32bit_set(ffa_dev);  in tpm_crb_ffa_probe()
298 	/* verify compatibility of TPM service version number */  in tpm_crb_ffa_probe()
299 	rc = tpm_crb_ffa_get_interface_version(&tpm_crb_ffa->major_version,  in tpm_crb_ffa_probe()
300 					       &tpm_crb_ffa->minor_version);  in tpm_crb_ffa_probe()
302 		pr_err("failed to get crb interface version. rc:%d", rc);  in tpm_crb_ffa_probe()
306 	pr_info("ABI version %u.%u", tpm_crb_ffa->major_version,  in tpm_crb_ffa_probe()
307 		tpm_crb_ffa->minor_version);  in tpm_crb_ffa_probe()
309 	if (tpm_crb_ffa->major_version != CRB_FFA_VERSION_MAJOR ||  in tpm_crb_ffa_probe()
310 	    (tpm_crb_ffa->minor_version > 0 &&  in tpm_crb_ffa_probe()
311 	    tpm_crb_ffa->minor_version < CRB_FFA_VERSION_MINOR)) {  in tpm_crb_ffa_probe()
312 		pr_err("Incompatible ABI version");  in tpm_crb_ffa_probe()
320 	tpm_crb_ffa = ERR_PTR(-ENODEV);  in tpm_crb_ffa_probe()
321 	return -EINVAL;  in tpm_crb_ffa_probe()
331 	/* 17b862a4-1806-4faf-86b3-089a58353861 */
338 	.name = "ffa-crb",