drivers/mailbox/k3-sec-proxy.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Texas Instruments' K3 Secure proxy Driver
   4  *
   5  * Copyright (C) 2017-2018 Texas Instruments Incorporated - http://www.ti.com/
   6  *      Lokesh Vutla <lokeshvutla@ti.com>
   7  */
   8
   9 #include <common.h>
  10 #include <malloc.h>
  11 #include <asm/io.h>
  12 #include <dm/device_compat.h>
  13 #include <linux/types.h>
  14 #include <linux/bitops.h>
  15 #include <linux/soc/ti/k3-sec-proxy.h>
  16 #include <dm.h>
  17 #include <mailbox-uclass.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 /* SEC PROXY RT THREAD STATUS */
  22 #define RT_THREAD_STATUS                        0x0
  23 #define RT_THREAD_THRESHOLD                     0x4
  24 #define RT_THREAD_STATUS_ERROR_SHIFT            31
  25 #define RT_THREAD_STATUS_ERROR_MASK             BIT(31)
  26 #define RT_THREAD_STATUS_CUR_CNT_SHIFT          0
  27 #define RT_THREAD_STATUS_CUR_CNT_MASK           GENMASK(7, 0)
  28
  29 /* SEC PROXY SCFG THREAD CTRL */
  30 #define SCFG_THREAD_CTRL                        0x1000
  31 #define SCFG_THREAD_CTRL_DIR_SHIFT              31
  32 #define SCFG_THREAD_CTRL_DIR_MASK               BIT(31)
  33
  34 #define SEC_PROXY_THREAD(base, x)               ((base) + (0x1000 * (x)))
  35 #define THREAD_IS_RX                            1
  36 #define THREAD_IS_TX                            0
  37
  38 /**
  39  * struct k3_sec_proxy_desc - Description of secure proxy integration.
  40  * @thread_count:       Number of Threads.
  41  * @max_msg_size:       Message size in bytes.
  42  * @data_start_offset:  Offset of the First data register of the thread
  43  * @data_end_offset:    Offset of the Last data register of the thread
  44  * @valid_threads:      List of Valid threads that the processor can access
  45  * @num_valid_threads:  Number of valid threads.
  46  */
  47 struct k3_sec_proxy_desc {
  48         u16 thread_count;
  49         u16 max_msg_size;
  50         u16 data_start_offset;
  51         u16 data_end_offset;
  52         const u32 *valid_threads;
  53         u32 num_valid_threads;
  54 };
  55
  56 /**
  57  * struct k3_sec_proxy_thread - Description of a secure proxy Thread
  58  * @id:         Thread ID
  59  * @data:       Thread Data path region for target
  60  * @scfg:       Secure Config Region for Thread
  61  * @rt:         RealTime Region for Thread
  62  * @rx_buf:     Receive buffer data, max message size.
  63  */
  64 struct k3_sec_proxy_thread {
  65         u32 id;
  66         void __iomem *data;
  67         void __iomem *scfg;
  68         void __iomem *rt;
  69         u32 *rx_buf;
  70 };
  71
  72 /**
  73  * struct k3_sec_proxy_mbox - Description of a Secure Proxy Instance
  74  * @chan:               Mailbox Channel
  75  * @desc:               Description of the SoC integration
  76  * @chans:              Array for valid thread instances
  77  * @target_data:        Secure Proxy region for Target Data
  78  * @scfg:               Secure Proxy Region for Secure configuration.
  79  * @rt:                 Secure proxy Region for Real Time Region.
  80  */
  81 struct k3_sec_proxy_mbox {
  82         struct mbox_chan chan;
  83         struct k3_sec_proxy_desc *desc;
  84         struct k3_sec_proxy_thread *chans;
  85         phys_addr_t target_data;
  86         phys_addr_t scfg;
  87         phys_addr_t rt;
  88 };
  89
  90 static inline u32 sp_readl(void __iomem *addr, unsigned int offset)
  91 {
  92         return readl(addr + offset);
  93 }
  94
  95 static inline void sp_writel(void __iomem *addr, unsigned int offset, u32 data)
  96 {
  97         writel(data, addr + offset);
  98 }
  99
 100 /**
 101  * k3_sec_proxy_of_xlate() - Translation of phandle to channel
 102  * @chan:       Mailbox channel
 103  * @args:       Phandle Pointer
 104  *
 105  * Translates the phandle args and fills up the Mailbox channel from client.
 106  * Return: 0 if all goes good, else return corresponding error message.
 107  */
 108 static int k3_sec_proxy_of_xlate(struct mbox_chan *chan,
 109                                  struct ofnode_phandle_args *args)
 110 {
 111         struct k3_sec_proxy_mbox *spm = dev_get_priv(chan->dev);
 112         int ind, i;
 113
 114         debug("%s(chan=%p)\n", __func__, chan);
 115
 116         if (args->args_count != 1) {
 117                 debug("Invaild args_count: %d\n", args->args_count);
 118                 return -EINVAL;
 119         }
 120         ind = args->args[0];
 121
 122         for (i = 0; i < spm->desc->num_valid_threads; i++)
 123                 if (spm->chans[i].id == ind) {
 124                         chan->id = ind;
 125                         chan->con_priv = &spm->chans[i];
 126                         return 0;
 127                 }
 128
 129         dev_err(chan->dev, "%s: Invalid Thread ID %d\n", __func__, ind);
 130         return -ENOENT;
 131 }
 132
 133 /**
 134  * k3_sec_proxy_request() - Request for mailbox channel
 135  * @chan:       Channel Pointer
 136  */
 137 static int k3_sec_proxy_request(struct mbox_chan *chan)
 138 {
 139         debug("%s(chan=%p)\n", __func__, chan);
 140
 141         return 0;
 142 }
 143
 144 /**
 145  * k3_sec_proxy_free() - Free the mailbox channel
 146  * @chan:       Channel Pointer
 147  */
 148 static int k3_sec_proxy_free(struct mbox_chan *chan)
 149 {
 150         debug("%s(chan=%p)\n", __func__, chan);
 151
 152         return 0;
 153 }
 154
 155 /**
 156  * k3_sec_proxy_verify_thread() - Verify thread status before
 157  *                                sending/receiving data.
 158  * @spt:        pointer to secure proxy thread description
 159  * @dir:        Direction of the thread
 160  *
 161  * Return: 0 if all goes good, else appropriate error message.
 162  */
 163 static inline int k3_sec_proxy_verify_thread(struct k3_sec_proxy_thread *spt,
 164                                              u8 dir)
 165 {
 166         /* Check for any errors already available */
 167         if (sp_readl(spt->rt, RT_THREAD_STATUS) &
 168             RT_THREAD_STATUS_ERROR_MASK) {
 169                 printf("%s: Thread %d is corrupted, cannot send data.\n",
 170                        __func__, spt->id);
 171                 return -EINVAL;
 172         }
 173
 174         /* Make sure thread is configured for right direction */
 175         if ((sp_readl(spt->scfg, SCFG_THREAD_CTRL)
 176             & SCFG_THREAD_CTRL_DIR_MASK) >> SCFG_THREAD_CTRL_DIR_SHIFT != dir) {
 177                 if (dir)
 178                         printf("%s: Trying to receive data on tx Thread %d\n",
 179                                __func__, spt->id);
 180                 else
 181                         printf("%s: Trying to send data on rx Thread %d\n",
 182                                __func__, spt->id);
 183                 return -EINVAL;
 184         }
 185
 186         /* Check the message queue before sending/receiving data */
 187         if (!(sp_readl(spt->rt, RT_THREAD_STATUS) &
 188               RT_THREAD_STATUS_CUR_CNT_MASK))
 189                 return -ENODATA;
 190
 191         return 0;
 192 }
 193
 194 /**
 195  * k3_sec_proxy_send() - Send data via mailbox channel
 196  * @chan:       Channel Pointer
 197  * @data:       Pointer to k3_sec_proxy_msg
 198  *
 199  * Return: 0 if all goes good, else appropriate error message.
 200  */
 201 static int k3_sec_proxy_send(struct mbox_chan *chan, const void *data)
 202 {
 203         const struct k3_sec_proxy_msg *msg = (struct k3_sec_proxy_msg *)data;
 204         struct k3_sec_proxy_mbox *spm = dev_get_priv(chan->dev);
 205         struct k3_sec_proxy_thread *spt = chan->con_priv;
 206         int num_words, trail_bytes, ret;
 207         void __iomem *data_reg;
 208         u32 *word_data;
 209
 210         debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
 211
 212         ret = k3_sec_proxy_verify_thread(spt, THREAD_IS_TX);
 213         if (ret) {
 214                 dev_err(dev, "%s: Thread%d verification failed. ret = %d\n",
 215                         __func__, spt->id, ret);
 216                 return ret;
 217         }
 218
 219         /* Check the message size. */
 220         if (msg->len > spm->desc->max_msg_size) {
 221                 printf("%s: Thread %ld message length %zu > max msg size %d\n",
 222                        __func__, chan->id, msg->len, spm->desc->max_msg_size);
 223                 return -EINVAL;
 224         }
 225
 226         /* Send the message */
 227         data_reg = spt->data + spm->desc->data_start_offset;
 228         for (num_words = msg->len / sizeof(u32), word_data = (u32 *)msg->buf;
 229              num_words;
 230              num_words--, data_reg += sizeof(u32), word_data++)
 231                 writel(*word_data, data_reg);
 232
 233         trail_bytes = msg->len % sizeof(u32);
 234         if (trail_bytes) {
 235                 u32 data_trail = *word_data;
 236
 237                 /* Ensure all unused data is 0 */
 238                 data_trail &= 0xFFFFFFFF >> (8 * (sizeof(u32) - trail_bytes));
 239                 writel(data_trail, data_reg);
 240                 data_reg++;
 241         }
 242
 243         /*
 244          * 'data_reg' indicates next register to write. If we did not already
 245          * write on tx complete reg(last reg), we must do so for transmit
 246          */
 247         if (data_reg <= (spt->data + spm->desc->data_end_offset))
 248                 sp_writel(spt->data, spm->desc->data_end_offset, 0);
 249
 250         debug("%s: Message successfully sent on thread %ld\n",
 251               __func__, chan->id);
 252
 253         return 0;
 254 }
 255
 256 /**
 257  * k3_sec_proxy_recv() - Receive data via mailbox channel
 258  * @chan:       Channel Pointer
 259  * @data:       Pointer to k3_sec_proxy_msg
 260  *
 261  * Return: 0 if all goes good, else appropriate error message.
 262  */
 263 static int k3_sec_proxy_recv(struct mbox_chan *chan, void *data)
 264 {
 265         struct k3_sec_proxy_mbox *spm = dev_get_priv(chan->dev);
 266         struct k3_sec_proxy_thread *spt = chan->con_priv;
 267         struct k3_sec_proxy_msg *msg = data;
 268         void __iomem *data_reg;
 269         int num_words, ret;
 270         u32 *word_data;
 271
 272         debug("%s(chan=%p, data=%p)\n", __func__, chan, data);
 273
 274         ret = k3_sec_proxy_verify_thread(spt, THREAD_IS_RX);
 275         if (ret)
 276                 return ret;
 277
 278         msg->len = spm->desc->max_msg_size;
 279         msg->buf = spt->rx_buf;
 280         data_reg = spt->data + spm->desc->data_start_offset;
 281         word_data = spt->rx_buf;
 282         for (num_words = spm->desc->max_msg_size / sizeof(u32);
 283              num_words;
 284              num_words--, data_reg += sizeof(u32), word_data++)
 285                 *word_data = readl(data_reg);
 286
 287         debug("%s: Message successfully received from thread %ld\n",
 288               __func__, chan->id);
 289
 290         return 0;
 291 }
 292
 293 struct mbox_ops k3_sec_proxy_mbox_ops = {
 294         .of_xlate = k3_sec_proxy_of_xlate,
 295         .request = k3_sec_proxy_request,
 296         .rfree = k3_sec_proxy_free,
 297         .send = k3_sec_proxy_send,
 298         .recv = k3_sec_proxy_recv,
 299 };
 300
 301 /**
 302  * k3_sec_proxy_of_to_priv() - generate private data from device tree
 303  * @dev:        corresponding k3 secure proxy device
 304  * @spm:        pointer to driver specific private data
 305  *
 306  * Return: 0 if all went ok, else corresponding error message.
 307  */
 308 static int k3_sec_proxy_of_to_priv(struct udevice *dev,
 309                                    struct k3_sec_proxy_mbox *spm)
 310 {
 311         const void *blob = gd->fdt_blob;
 312
 313         if (!blob) {
 314                 debug("'%s' no dt?\n", dev->name);
 315                 return -ENODEV;
 316         }
 317
 318         spm->target_data = devfdt_get_addr_name(dev, "target_data");
 319         if (spm->target_data == FDT_ADDR_T_NONE) {
 320                 dev_err(dev, "No reg property for target data base\n");
 321                 return -EINVAL;
 322         }
 323
 324         spm->scfg = devfdt_get_addr_name(dev, "scfg");
 325         if (spm->rt == FDT_ADDR_T_NONE) {
 326                 dev_err(dev, "No reg property for Secure Cfg base\n");
 327                 return -EINVAL;
 328         }
 329
 330         spm->rt = devfdt_get_addr_name(dev, "rt");
 331         if (spm->rt == FDT_ADDR_T_NONE) {
 332                 dev_err(dev, "No reg property for Real Time Cfg base\n");
 333                 return -EINVAL;
 334         }
 335
 336         return 0;
 337 }
 338
 339 /**
 340  * k3_sec_proxy_thread_setup - Initialize the parameters for all valid threads
 341  * @spm:        Mailbox instance for which threads needs to be initialized
 342  *
 343  * Return: 0 if all went ok, else corresponding error message
 344  */
 345 static int k3_sec_proxy_thread_setup(struct k3_sec_proxy_mbox *spm)
 346 {
 347         struct k3_sec_proxy_thread *spt;
 348         int i, ind;
 349
 350         for (i = 0; i < spm->desc->num_valid_threads; i++) {
 351                 spt = &spm->chans[i];
 352                 ind = spm->desc->valid_threads[i];
 353                 spt->id = ind;
 354                 spt->data = (void *)SEC_PROXY_THREAD(spm->target_data, ind);
 355                 spt->scfg = (void *)SEC_PROXY_THREAD(spm->scfg, ind);
 356                 spt->rt = (void *)SEC_PROXY_THREAD(spm->rt, ind);
 357                 spt->rx_buf = calloc(1, spm->desc->max_msg_size);
 358                 if (!spt->rx_buf)
 359                         return -ENOMEM;
 360         }
 361
 362         return 0;
 363 }
 364
 365 /**
 366  * k3_sec_proxy_probe() - Basic probe
 367  * @dev:        corresponding mailbox device
 368  *
 369  * Return: 0 if all went ok, else corresponding error message
 370  */
 371 static int k3_sec_proxy_probe(struct udevice *dev)
 372 {
 373         struct k3_sec_proxy_mbox *spm = dev_get_priv(dev);
 374         int ret;
 375
 376         debug("%s(dev=%p)\n", __func__, dev);
 377
 378         ret = k3_sec_proxy_of_to_priv(dev, spm);
 379         if (ret)
 380                 return ret;
 381
 382         spm->desc = (void *)dev_get_driver_data(dev);
 383         spm->chans = calloc(spm->desc->num_valid_threads,
 384                             sizeof(struct k3_sec_proxy_thread));
 385         if (!spm->chans)
 386                 return -ENOMEM;
 387
 388         ret = k3_sec_proxy_thread_setup(spm);
 389         if (ret) {
 390                 debug("%s: secure proxy thread setup failed\n", __func__);
 391                 return ret;
 392         }
 393
 394         return 0;
 395 }
 396
 397 static int k3_sec_proxy_remove(struct udevice *dev)
 398 {
 399         struct k3_sec_proxy_mbox *spm = dev_get_priv(dev);
 400
 401         debug("%s(dev=%p)\n", __func__, dev);
 402
 403         free(spm->chans);
 404
 405         return 0;
 406 }
 407
 408 /*
 409  * Thread ID #4: ROM request
 410  * Thread ID #5: ROM response, SYSFW notify
 411  * Thread ID #6: SYSFW request response
 412  * Thread ID #7: SYSFW request high priority
 413  * Thread ID #8: SYSFW request low priority
 414  * Thread ID #9: SYSFW notify response
 415  */
 416 static const u32 am6x_valid_threads[] = { 4, 5, 6, 7, 8, 9, 11, 13 };
 417
 418 static const struct k3_sec_proxy_desc am654_desc = {
 419         .thread_count = 90,
 420         .max_msg_size = 60,
 421         .data_start_offset = 0x4,
 422         .data_end_offset = 0x3C,
 423         .valid_threads = am6x_valid_threads,
 424         .num_valid_threads = ARRAY_SIZE(am6x_valid_threads),
 425 };
 426
 427 static const struct udevice_id k3_sec_proxy_ids[] = {
 428         { .compatible = "ti,am654-secure-proxy", .data = (ulong)&am654_desc},
 429         { }
 430 };
 431
 432 U_BOOT_DRIVER(k3_sec_proxy) = {
 433         .name = "k3-secure-proxy",
 434         .id = UCLASS_MAILBOX,
 435         .of_match = k3_sec_proxy_ids,
 436         .probe = k3_sec_proxy_probe,
 437         .remove = k3_sec_proxy_remove,
 438         .priv_auto_alloc_size = sizeof(struct k3_sec_proxy_mbox),
 439         .ops = &k3_sec_proxy_mbox_ops,
 440 };