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1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright 2019 Broadcom.4 */5 6#include <linux/kernel.h>7#include <linux/module.h>8#include <linux/sizes.h>9#include <linux/slab.h>10#include <linux/tee_drv.h>11#include <linux/uuid.h>12 13#include <linux/firmware/broadcom/tee_bnxt_fw.h>14 15#define MAX_SHM_MEM_SZ SZ_4M16 17#define MAX_TEE_PARAM_ARRY_MEMB 418 19enum ta_cmd {20 /*21 * TA_CMD_BNXT_FASTBOOT - boot bnxt device by copying f/w into sram22 *23 * param[0] unused24 * param[1] unused25 * param[2] unused26 * param[3] unused27 *28 * Result:29 * TEE_SUCCESS - Invoke command success30 * TEE_ERROR_ITEM_NOT_FOUND - Corrupt f/w image found on memory31 */32 TA_CMD_BNXT_FASTBOOT = 0,33 34 /*35 * TA_CMD_BNXT_COPY_COREDUMP - copy the core dump into shm36 *37 * param[0] (inout memref) - Coredump buffer memory reference38 * param[1] (in value) - value.a: offset, data to be copied from39 * value.b: size of data to be copied40 * param[2] unused41 * param[3] unused42 *43 * Result:44 * TEE_SUCCESS - Invoke command success45 * TEE_ERROR_BAD_PARAMETERS - Incorrect input param46 * TEE_ERROR_ITEM_NOT_FOUND - Corrupt core dump47 */48 TA_CMD_BNXT_COPY_COREDUMP = 3,49};50 51/**52 * struct tee_bnxt_fw_private - OP-TEE bnxt private data53 * @dev: OP-TEE based bnxt device.54 * @ctx: OP-TEE context handler.55 * @session_id: TA session identifier.56 */57struct tee_bnxt_fw_private {58 struct device *dev;59 struct tee_context *ctx;60 u32 session_id;61 struct tee_shm *fw_shm_pool;62};63 64static struct tee_bnxt_fw_private pvt_data;65 66static void prepare_args(int cmd,67 struct tee_ioctl_invoke_arg *arg,68 struct tee_param *param)69{70 memset(arg, 0, sizeof(*arg));71 memset(param, 0, MAX_TEE_PARAM_ARRY_MEMB * sizeof(*param));72 73 arg->func = cmd;74 arg->session = pvt_data.session_id;75 arg->num_params = MAX_TEE_PARAM_ARRY_MEMB;76 77 /* Fill invoke cmd params */78 switch (cmd) {79 case TA_CMD_BNXT_COPY_COREDUMP:80 param[0].attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT;81 param[0].u.memref.shm = pvt_data.fw_shm_pool;82 param[0].u.memref.size = MAX_SHM_MEM_SZ;83 param[0].u.memref.shm_offs = 0;84 param[1].attr = TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT;85 break;86 case TA_CMD_BNXT_FASTBOOT:87 default:88 /* Nothing to do */89 break;90 }91}92 93/**94 * tee_bnxt_fw_load() - Load the bnxt firmware95 * Uses an OP-TEE call to start a secure96 * boot process.97 * Returns 0 on success, negative errno otherwise.98 */99int tee_bnxt_fw_load(void)100{101 int ret = 0;102 struct tee_ioctl_invoke_arg arg;103 struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB];104 105 if (!pvt_data.ctx)106 return -ENODEV;107 108 prepare_args(TA_CMD_BNXT_FASTBOOT, &arg, param);109 110 ret = tee_client_invoke_func(pvt_data.ctx, &arg, param);111 if (ret < 0 || arg.ret != 0) {112 dev_err(pvt_data.dev,113 "TA_CMD_BNXT_FASTBOOT invoke failed TEE err: %x, ret:%x\n",114 arg.ret, ret);115 return -EINVAL;116 }117 118 return 0;119}120EXPORT_SYMBOL(tee_bnxt_fw_load);121 122/**123 * tee_bnxt_copy_coredump() - Copy coredump from the allocated memory124 * Uses an OP-TEE call to copy coredump125 * @buf: destination buffer where core dump is copied into126 * @offset: offset from the base address of core dump area127 * @size: size of the dump128 *129 * Returns 0 on success, negative errno otherwise.130 */131int tee_bnxt_copy_coredump(void *buf, u32 offset, u32 size)132{133 struct tee_ioctl_invoke_arg arg;134 struct tee_param param[MAX_TEE_PARAM_ARRY_MEMB];135 void *core_data;136 u32 rbytes = size;137 u32 nbytes = 0;138 int ret = 0;139 140 if (!pvt_data.ctx)141 return -ENODEV;142 143 prepare_args(TA_CMD_BNXT_COPY_COREDUMP, &arg, param);144 145 while (rbytes) {146 nbytes = rbytes;147 148 nbytes = min_t(u32, rbytes, param[0].u.memref.size);149 150 /* Fill additional invoke cmd params */151 param[1].u.value.a = offset;152 param[1].u.value.b = nbytes;153 154 ret = tee_client_invoke_func(pvt_data.ctx, &arg, param);155 if (ret < 0 || arg.ret != 0) {156 dev_err(pvt_data.dev,157 "TA_CMD_BNXT_COPY_COREDUMP invoke failed TEE err: %x, ret:%x\n",158 arg.ret, ret);159 return -EINVAL;160 }161 162 core_data = tee_shm_get_va(pvt_data.fw_shm_pool, 0);163 if (IS_ERR(core_data)) {164 dev_err(pvt_data.dev, "tee_shm_get_va failed\n");165 return PTR_ERR(core_data);166 }167 168 memcpy(buf, core_data, nbytes);169 170 rbytes -= nbytes;171 buf += nbytes;172 offset += nbytes;173 }174 175 return 0;176}177EXPORT_SYMBOL(tee_bnxt_copy_coredump);178 179static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)180{181 return (ver->impl_id == TEE_IMPL_ID_OPTEE);182}183 184static int tee_bnxt_fw_probe(struct device *dev)185{186 struct tee_client_device *bnxt_device = to_tee_client_device(dev);187 int ret, err = -ENODEV;188 struct tee_ioctl_open_session_arg sess_arg;189 struct tee_shm *fw_shm_pool;190 191 memset(&sess_arg, 0, sizeof(sess_arg));192 193 /* Open context with TEE driver */194 pvt_data.ctx = tee_client_open_context(NULL, optee_ctx_match, NULL,195 NULL);196 if (IS_ERR(pvt_data.ctx))197 return -ENODEV;198 199 /* Open session with Bnxt load Trusted App */200 export_uuid(sess_arg.uuid, &bnxt_device->id.uuid);201 sess_arg.clnt_login = TEE_IOCTL_LOGIN_PUBLIC;202 sess_arg.num_params = 0;203 204 ret = tee_client_open_session(pvt_data.ctx, &sess_arg, NULL);205 if (ret < 0 || sess_arg.ret != 0) {206 dev_err(dev, "tee_client_open_session failed, err: %x\n",207 sess_arg.ret);208 err = -EINVAL;209 goto out_ctx;210 }211 pvt_data.session_id = sess_arg.session;212 213 pvt_data.dev = dev;214 215 fw_shm_pool = tee_shm_alloc_kernel_buf(pvt_data.ctx, MAX_SHM_MEM_SZ);216 if (IS_ERR(fw_shm_pool)) {217 dev_err(pvt_data.dev, "tee_shm_alloc_kernel_buf failed\n");218 err = PTR_ERR(fw_shm_pool);219 goto out_sess;220 }221 222 pvt_data.fw_shm_pool = fw_shm_pool;223 224 return 0;225 226out_sess:227 tee_client_close_session(pvt_data.ctx, pvt_data.session_id);228out_ctx:229 tee_client_close_context(pvt_data.ctx);230 231 return err;232}233 234static int tee_bnxt_fw_remove(struct device *dev)235{236 tee_shm_free(pvt_data.fw_shm_pool);237 tee_client_close_session(pvt_data.ctx, pvt_data.session_id);238 tee_client_close_context(pvt_data.ctx);239 pvt_data.ctx = NULL;240 241 return 0;242}243 244static void tee_bnxt_fw_shutdown(struct device *dev)245{246 tee_shm_free(pvt_data.fw_shm_pool);247 tee_client_close_session(pvt_data.ctx, pvt_data.session_id);248 tee_client_close_context(pvt_data.ctx);249 pvt_data.ctx = NULL;250}251 252static const struct tee_client_device_id tee_bnxt_fw_id_table[] = {253 {UUID_INIT(0x6272636D, 0x2019, 0x0716,254 0x42, 0x43, 0x4D, 0x5F, 0x53, 0x43, 0x48, 0x49)},255 {}256};257 258MODULE_DEVICE_TABLE(tee, tee_bnxt_fw_id_table);259 260static struct tee_client_driver tee_bnxt_fw_driver = {261 .id_table = tee_bnxt_fw_id_table,262 .driver = {263 .name = KBUILD_MODNAME,264 .bus = &tee_bus_type,265 .probe = tee_bnxt_fw_probe,266 .remove = tee_bnxt_fw_remove,267 .shutdown = tee_bnxt_fw_shutdown,268 },269};270 271static int __init tee_bnxt_fw_mod_init(void)272{273 return driver_register(&tee_bnxt_fw_driver.driver);274}275 276static void __exit tee_bnxt_fw_mod_exit(void)277{278 driver_unregister(&tee_bnxt_fw_driver.driver);279}280 281module_init(tee_bnxt_fw_mod_init);282module_exit(tee_bnxt_fw_mod_exit);283 284MODULE_AUTHOR("Vikas Gupta <vikas.gupta@broadcom.com>");285MODULE_DESCRIPTION("Broadcom bnxt firmware manager");286MODULE_LICENSE("GPL v2");287