drivers/firmware/qcom_scm-64.c

   1 /* Copyright (c) 2015, The Linux Foundation. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  */
  12
  13 #include <linux/io.h>
  14 #include <linux/errno.h>
  15 #include <linux/delay.h>
  16 #include <linux/mutex.h>
  17 #include <linux/slab.h>
  18 #include <linux/types.h>
  19 #include <linux/qcom_scm.h>
  20 #include <linux/arm-smccc.h>
  21 #include <linux/dma-mapping.h>
  22
  23 #include "qcom_scm.h"
  24
  25 #define QCOM_SCM_FNID(s, c) ((((s) & 0xFF) << 8) | ((c) & 0xFF))
  26
  27 #define MAX_QCOM_SCM_ARGS 10
  28 #define MAX_QCOM_SCM_RETS 3
  29
  30 enum qcom_scm_arg_types {
  31         QCOM_SCM_VAL,
  32         QCOM_SCM_RO,
  33         QCOM_SCM_RW,
  34         QCOM_SCM_BUFVAL,
  35 };
  36
  37 #define QCOM_SCM_ARGS_IMPL(num, a, b, c, d, e, f, g, h, i, j, ...) (\
  38                            (((a) & 0x3) << 4) | \
  39                            (((b) & 0x3) << 6) | \
  40                            (((c) & 0x3) << 8) | \
  41                            (((d) & 0x3) << 10) | \
  42                            (((e) & 0x3) << 12) | \
  43                            (((f) & 0x3) << 14) | \
  44                            (((g) & 0x3) << 16) | \
  45                            (((h) & 0x3) << 18) | \
  46                            (((i) & 0x3) << 20) | \
  47                            (((j) & 0x3) << 22) | \
  48                            ((num) & 0xf))
  49
  50 #define QCOM_SCM_ARGS(...) QCOM_SCM_ARGS_IMPL(__VA_ARGS__, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0)
  51
  52 /**
  53  * struct qcom_scm_desc
  54  * @arginfo:    Metadata describing the arguments in args[]
  55  * @args:       The array of arguments for the secure syscall
  56  * @res:        The values returned by the secure syscall
  57  */
  58 struct qcom_scm_desc {
  59         u32 arginfo;
  60         u64 args[MAX_QCOM_SCM_ARGS];
  61 };
  62
  63 static u64 qcom_smccc_convention = -1;
  64 static DEFINE_MUTEX(qcom_scm_lock);
  65
  66 #define QCOM_SCM_EBUSY_WAIT_MS 30
  67 #define QCOM_SCM_EBUSY_MAX_RETRY 20
  68
  69 #define N_EXT_QCOM_SCM_ARGS 7
  70 #define FIRST_EXT_ARG_IDX 3
  71 #define N_REGISTER_ARGS (MAX_QCOM_SCM_ARGS - N_EXT_QCOM_SCM_ARGS + 1)
  72
  73 /**
  74  * qcom_scm_call() - Invoke a syscall in the secure world
  75  * @dev:        device
  76  * @svc_id:     service identifier
  77  * @cmd_id:     command identifier
  78  * @desc:       Descriptor structure containing arguments and return values
  79  *
  80  * Sends a command to the SCM and waits for the command to finish processing.
  81  * This should *only* be called in pre-emptible context.
  82 */
  83 static int qcom_scm_call(struct device *dev, u32 svc_id, u32 cmd_id,
  84                          const struct qcom_scm_desc *desc,
  85                          struct arm_smccc_res *res)
  86 {
  87         int arglen = desc->arginfo & 0xf;
  88         int retry_count = 0, i;
  89         u32 fn_id = QCOM_SCM_FNID(svc_id, cmd_id);
  90         u64 cmd, x5 = desc->args[FIRST_EXT_ARG_IDX];
  91         dma_addr_t args_phys = 0;
  92         void *args_virt = NULL;
  93         size_t alloc_len;
  94         struct arm_smccc_quirk quirk = {.id = ARM_SMCCC_QUIRK_QCOM_A6};
  95
  96         if (unlikely(arglen > N_REGISTER_ARGS)) {
  97                 alloc_len = N_EXT_QCOM_SCM_ARGS * sizeof(u64);
  98                 args_virt = kzalloc(PAGE_ALIGN(alloc_len), GFP_KERNEL);
  99
 100                 if (!args_virt)
 101                         return -ENOMEM;
 102
 103                 if (qcom_smccc_convention == ARM_SMCCC_SMC_32) {
 104                         __le32 *args = args_virt;
 105
 106                         for (i = 0; i < N_EXT_QCOM_SCM_ARGS; i++)
 107                                 args[i] = cpu_to_le32(desc->args[i +
 108                                                       FIRST_EXT_ARG_IDX]);
 109                 } else {
 110                         __le64 *args = args_virt;
 111
 112                         for (i = 0; i < N_EXT_QCOM_SCM_ARGS; i++)
 113                                 args[i] = cpu_to_le64(desc->args[i +
 114                                                       FIRST_EXT_ARG_IDX]);
 115                 }
 116
 117                 args_phys = dma_map_single(dev, args_virt, alloc_len,
 118                                            DMA_TO_DEVICE);
 119
 120                 if (dma_mapping_error(dev, args_phys)) {
 121                         kfree(args_virt);
 122                         return -ENOMEM;
 123                 }
 124
 125                 x5 = args_phys;
 126         }
 127
 128         do {
 129                 mutex_lock(&qcom_scm_lock);
 130
 131                 cmd = ARM_SMCCC_CALL_VAL(ARM_SMCCC_STD_CALL,
 132                                          qcom_smccc_convention,
 133                                          ARM_SMCCC_OWNER_SIP, fn_id);
 134
 135                 quirk.state.a6 = 0;
 136
 137                 do {
 138                         arm_smccc_smc_quirk(cmd, desc->arginfo, desc->args[0],
 139                                       desc->args[1], desc->args[2], x5,
 140                                       quirk.state.a6, 0, res, &quirk);
 141
 142                         if (res->a0 == QCOM_SCM_INTERRUPTED)
 143                                 cmd = res->a0;
 144
 145                 } while (res->a0 == QCOM_SCM_INTERRUPTED);
 146
 147                 mutex_unlock(&qcom_scm_lock);
 148
 149                 if (res->a0 == QCOM_SCM_V2_EBUSY) {
 150                         if (retry_count++ > QCOM_SCM_EBUSY_MAX_RETRY)
 151                                 break;
 152                         msleep(QCOM_SCM_EBUSY_WAIT_MS);
 153                 }
 154         }  while (res->a0 == QCOM_SCM_V2_EBUSY);
 155
 156         if (args_virt) {
 157                 dma_unmap_single(dev, args_phys, alloc_len, DMA_TO_DEVICE);
 158                 kfree(args_virt);
 159         }
 160
 161         if (res->a0 < 0)
 162                 return qcom_scm_remap_error(res->a0);
 163
 164         return 0;
 165 }
 166
 167 /**
 168  * qcom_scm_set_cold_boot_addr() - Set the cold boot address for cpus
 169  * @entry: Entry point function for the cpus
 170  * @cpus: The cpumask of cpus that will use the entry point
 171  *
 172  * Set the cold boot address of the cpus. Any cpu outside the supported
 173  * range would be removed from the cpu present mask.
 174  */
 175 int __qcom_scm_set_cold_boot_addr(void *entry, const cpumask_t *cpus)
 176 {
 177         return -ENOTSUPP;
 178 }
 179
 180 /**
 181  * qcom_scm_set_warm_boot_addr() - Set the warm boot address for cpus
 182  * @dev: Device pointer
 183  * @entry: Entry point function for the cpus
 184  * @cpus: The cpumask of cpus that will use the entry point
 185  *
 186  * Set the Linux entry point for the SCM to transfer control to when coming
 187  * out of a power down. CPU power down may be executed on cpuidle or hotplug.
 188  */
 189 int __qcom_scm_set_warm_boot_addr(struct device *dev, void *entry,
 190                                   const cpumask_t *cpus)
 191 {
 192         return -ENOTSUPP;
 193 }
 194
 195 /**
 196  * qcom_scm_cpu_power_down() - Power down the cpu
 197  * @flags - Flags to flush cache
 198  *
 199  * This is an end point to power down cpu. If there was a pending interrupt,
 200  * the control would return from this function, otherwise, the cpu jumps to the
 201  * warm boot entry point set for this cpu upon reset.
 202  */
 203 void __qcom_scm_cpu_power_down(u32 flags)
 204 {
 205 }
 206
 207 int __qcom_scm_is_call_available(struct device *dev, u32 svc_id, u32 cmd_id)
 208 {
 209         int ret;
 210         struct qcom_scm_desc desc = {0};
 211         struct arm_smccc_res res;
 212
 213         desc.arginfo = QCOM_SCM_ARGS(1);
 214         desc.args[0] = QCOM_SCM_FNID(svc_id, cmd_id) |
 215                         (ARM_SMCCC_OWNER_SIP << ARM_SMCCC_OWNER_SHIFT);
 216
 217         ret = qcom_scm_call(dev, QCOM_SCM_SVC_INFO, QCOM_IS_CALL_AVAIL_CMD,
 218                             &desc, &res);
 219
 220         return ret ? : res.a1;
 221 }
 222
 223 int __qcom_scm_hdcp_req(struct device *dev, struct qcom_scm_hdcp_req *req,
 224                         u32 req_cnt, u32 *resp)
 225 {
 226         int ret;
 227         struct qcom_scm_desc desc = {0};
 228         struct arm_smccc_res res;
 229
 230         if (req_cnt > QCOM_SCM_HDCP_MAX_REQ_CNT)
 231                 return -ERANGE;
 232
 233         desc.args[0] = req[0].addr;
 234         desc.args[1] = req[0].val;
 235         desc.args[2] = req[1].addr;
 236         desc.args[3] = req[1].val;
 237         desc.args[4] = req[2].addr;
 238         desc.args[5] = req[2].val;
 239         desc.args[6] = req[3].addr;
 240         desc.args[7] = req[3].val;
 241         desc.args[8] = req[4].addr;
 242         desc.args[9] = req[4].val;
 243         desc.arginfo = QCOM_SCM_ARGS(10);
 244
 245         ret = qcom_scm_call(dev, QCOM_SCM_SVC_HDCP, QCOM_SCM_CMD_HDCP, &desc,
 246                             &res);
 247         *resp = res.a1;
 248
 249         return ret;
 250 }
 251
 252 void __qcom_scm_init(void)
 253 {
 254         u64 cmd;
 255         struct arm_smccc_res res;
 256         u32 function = QCOM_SCM_FNID(QCOM_SCM_SVC_INFO, QCOM_IS_CALL_AVAIL_CMD);
 257
 258         /* First try a SMC64 call */
 259         cmd = ARM_SMCCC_CALL_VAL(ARM_SMCCC_FAST_CALL, ARM_SMCCC_SMC_64,
 260                                  ARM_SMCCC_OWNER_SIP, function);
 261
 262         arm_smccc_smc(cmd, QCOM_SCM_ARGS(1), cmd & (~BIT(ARM_SMCCC_TYPE_SHIFT)),
 263                       0, 0, 0, 0, 0, &res);
 264
 265         if (!res.a0 && res.a1)
 266                 qcom_smccc_convention = ARM_SMCCC_SMC_64;
 267         else
 268                 qcom_smccc_convention = ARM_SMCCC_SMC_32;
 269 }
 270
 271 bool __qcom_scm_pas_supported(struct device *dev, u32 peripheral)
 272 {
 273         int ret;
 274         struct qcom_scm_desc desc = {0};
 275         struct arm_smccc_res res;
 276
 277         desc.args[0] = peripheral;
 278         desc.arginfo = QCOM_SCM_ARGS(1);
 279
 280         ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
 281                                 QCOM_SCM_PAS_IS_SUPPORTED_CMD,
 282                                 &desc, &res);
 283
 284         return ret ? false : !!res.a1;
 285 }
 286
 287 int __qcom_scm_pas_init_image(struct device *dev, u32 peripheral,
 288                               dma_addr_t metadata_phys)
 289 {
 290         int ret;
 291         struct qcom_scm_desc desc = {0};
 292         struct arm_smccc_res res;
 293
 294         desc.args[0] = peripheral;
 295         desc.args[1] = metadata_phys;
 296         desc.arginfo = QCOM_SCM_ARGS(2, QCOM_SCM_VAL, QCOM_SCM_RW);
 297
 298         ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_INIT_IMAGE_CMD,
 299                                 &desc, &res);
 300
 301         return ret ? : res.a1;
 302 }
 303
 304 int __qcom_scm_pas_mem_setup(struct device *dev, u32 peripheral,
 305                               phys_addr_t addr, phys_addr_t size)
 306 {
 307         int ret;
 308         struct qcom_scm_desc desc = {0};
 309         struct arm_smccc_res res;
 310
 311         desc.args[0] = peripheral;
 312         desc.args[1] = addr;
 313         desc.args[2] = size;
 314         desc.arginfo = QCOM_SCM_ARGS(3);
 315
 316         ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_MEM_SETUP_CMD,
 317                                 &desc, &res);
 318
 319         return ret ? : res.a1;
 320 }
 321
 322 int __qcom_scm_pas_auth_and_reset(struct device *dev, u32 peripheral)
 323 {
 324         int ret;
 325         struct qcom_scm_desc desc = {0};
 326         struct arm_smccc_res res;
 327
 328         desc.args[0] = peripheral;
 329         desc.arginfo = QCOM_SCM_ARGS(1);
 330
 331         ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL,
 332                                 QCOM_SCM_PAS_AUTH_AND_RESET_CMD,
 333                                 &desc, &res);
 334
 335         return ret ? : res.a1;
 336 }
 337
 338 int __qcom_scm_pas_shutdown(struct device *dev, u32 peripheral)
 339 {
 340         int ret;
 341         struct qcom_scm_desc desc = {0};
 342         struct arm_smccc_res res;
 343
 344         desc.args[0] = peripheral;
 345         desc.arginfo = QCOM_SCM_ARGS(1);
 346
 347         ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_SHUTDOWN_CMD,
 348                         &desc, &res);
 349
 350         return ret ? : res.a1;
 351 }
 352
 353 int __qcom_scm_pas_mss_reset(struct device *dev, bool reset)
 354 {
 355         struct qcom_scm_desc desc = {0};
 356         struct arm_smccc_res res;
 357         int ret;
 358
 359         desc.args[0] = reset;
 360         desc.args[1] = 0;
 361         desc.arginfo = QCOM_SCM_ARGS(2);
 362
 363         ret = qcom_scm_call(dev, QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_MSS_RESET, &desc,
 364                             &res);
 365
 366         return ret ? : res.a1;
 367 }
 368
 369 int __qcom_scm_set_remote_state(struct device *dev, u32 state, u32 id)
 370 {
 371         struct qcom_scm_desc desc = {0};
 372         struct arm_smccc_res res;
 373         int ret;
 374
 375         desc.args[0] = state;
 376         desc.args[1] = id;
 377         desc.arginfo = QCOM_SCM_ARGS(2);
 378
 379         ret = qcom_scm_call(dev, QCOM_SCM_SVC_BOOT, QCOM_SCM_SET_REMOTE_STATE,
 380                             &desc, &res);
 381
 382         return ret ? : res.a1;
 383 }