drivers/firmware/broadcom/tee_bnxt_fw.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   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_4M
  16
  17 #define MAX_TEE_PARAM_ARRY_MEMB         4
  18
  19 enum ta_cmd {
  20         /*
  21          * TA_CMD_BNXT_FASTBOOT - boot bnxt device by copying f/w into sram
  22          *
  23          *      param[0] unused
  24          *      param[1] unused
  25          *      param[2] unused
  26          *      param[3] unused
  27          *
  28          * Result:
  29          *      TEE_SUCCESS - Invoke command success
  30          *      TEE_ERROR_ITEM_NOT_FOUND - Corrupt f/w image found on memory
  31          */
  32         TA_CMD_BNXT_FASTBOOT = 0,
  33
  34         /*
  35          * TA_CMD_BNXT_COPY_COREDUMP - copy the core dump into shm
  36          *
  37          *      param[0] (inout memref) - Coredump buffer memory reference
  38          *      param[1] (in value) - value.a: offset, data to be copied from
  39          *                            value.b: size of data to be copied
  40          *      param[2] unused
  41          *      param[3] unused
  42          *
  43          * Result:
  44          *      TEE_SUCCESS - Invoke command success
  45          *      TEE_ERROR_BAD_PARAMETERS - Incorrect input param
  46          *      TEE_ERROR_ITEM_NOT_FOUND - Corrupt core dump
  47          */
  48         TA_CMD_BNXT_COPY_COREDUMP = 3,
  49 };
  50
  51 /**
  52  * struct tee_bnxt_fw_private - OP-TEE bnxt private data
  53  * @dev:                OP-TEE based bnxt device.
  54  * @ctx:                OP-TEE context handler.
  55  * @session_id:         TA session identifier.
  56  */
  57 struct 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
  64 static struct tee_bnxt_fw_private pvt_data;
  65
  66 static 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 firmware
  95  *                  Uses an OP-TEE call to start a secure
  96  *                  boot process.
  97  * Returns 0 on success, negative errno otherwise.
  98  */
  99 int 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 }
 120 EXPORT_SYMBOL(tee_bnxt_fw_load);
 121
 122 /**
 123  * tee_bnxt_copy_coredump() - Copy coredump from the allocated memory
 124  *                          Uses an OP-TEE call to copy coredump
 125  * @buf:        destination buffer where core dump is copied into
 126  * @offset:     offset from the base address of core dump area
 127  * @size:       size of the dump
 128  *
 129  * Returns 0 on success, negative errno otherwise.
 130  */
 131 int 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 }
 177 EXPORT_SYMBOL(tee_bnxt_copy_coredump);
 178
 179 static 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
 184 static 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         memcpy(sess_arg.uuid, bnxt_device->id.uuid.b, TEE_IOCTL_UUID_LEN);
 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(pvt_data.ctx, MAX_SHM_MEM_SZ,
 216                                     TEE_SHM_MAPPED | TEE_SHM_DMA_BUF);
 217         if (IS_ERR(fw_shm_pool)) {
 218                 dev_err(pvt_data.dev, "tee_shm_alloc failed\n");
 219                 err = PTR_ERR(fw_shm_pool);
 220                 goto out_sess;
 221         }
 222
 223         pvt_data.fw_shm_pool = fw_shm_pool;
 224
 225         return 0;
 226
 227 out_sess:
 228         tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
 229 out_ctx:
 230         tee_client_close_context(pvt_data.ctx);
 231
 232         return err;
 233 }
 234
 235 static int tee_bnxt_fw_remove(struct device *dev)
 236 {
 237         tee_shm_free(pvt_data.fw_shm_pool);
 238         tee_client_close_session(pvt_data.ctx, pvt_data.session_id);
 239         tee_client_close_context(pvt_data.ctx);
 240         pvt_data.ctx = NULL;
 241
 242         return 0;
 243 }
 244
 245 static const struct tee_client_device_id tee_bnxt_fw_id_table[] = {
 246         {UUID_INIT(0x6272636D, 0x2019, 0x0716,
 247                     0x42, 0x43, 0x4D, 0x5F, 0x53, 0x43, 0x48, 0x49)},
 248         {}
 249 };
 250
 251 MODULE_DEVICE_TABLE(tee, tee_bnxt_fw_id_table);
 252
 253 static struct tee_client_driver tee_bnxt_fw_driver = {
 254         .id_table       = tee_bnxt_fw_id_table,
 255         .driver         = {
 256                 .name           = KBUILD_MODNAME,
 257                 .bus            = &tee_bus_type,
 258                 .probe          = tee_bnxt_fw_probe,
 259                 .remove         = tee_bnxt_fw_remove,
 260         },
 261 };
 262
 263 static int __init tee_bnxt_fw_mod_init(void)
 264 {
 265         return driver_register(&tee_bnxt_fw_driver.driver);
 266 }
 267
 268 static void __exit tee_bnxt_fw_mod_exit(void)
 269 {
 270         driver_unregister(&tee_bnxt_fw_driver.driver);
 271 }
 272
 273 module_init(tee_bnxt_fw_mod_init);
 274 module_exit(tee_bnxt_fw_mod_exit);
 275
 276 MODULE_AUTHOR("Vikas Gupta <vikas.gupta@broadcom.com>");
 277 MODULE_DESCRIPTION("Broadcom bnxt firmware manager");
 278 MODULE_LICENSE("GPL v2");