drivers/remoteproc/ste_modem_rproc.c

   1 /*
   2  * Copyright (C) ST-Ericsson AB 2012
   3  * Author: Sjur Brændeland <sjur.brandeland@stericsson.com>
   4  * License terms:  GNU General Public License (GPL), version 2
   5  */
   6
   7 #include <linux/module.h>
   8 #include <linux/dma-mapping.h>
   9 #include <linux/remoteproc.h>
  10 #include <linux/ste_modem_shm.h>
  11 #include "remoteproc_internal.h"
  12
  13 #define SPROC_FW_SIZE (50 * 4096)
  14 #define SPROC_MAX_TOC_ENTRIES 32
  15 #define SPROC_MAX_NOTIFY_ID 14
  16 #define SPROC_RESOURCE_NAME "rsc-table"
  17 #define SPROC_MODEM_NAME "ste-modem"
  18 #define SPROC_MODEM_FIRMWARE SPROC_MODEM_NAME "-fw.bin"
  19
  20 #define sproc_dbg(sproc, fmt, ...) \
  21         dev_dbg(&sproc->mdev->pdev.dev, fmt, ##__VA_ARGS__)
  22 #define sproc_err(sproc, fmt, ...) \
  23         dev_err(&sproc->mdev->pdev.dev, fmt, ##__VA_ARGS__)
  24
  25 /* STE-modem control structure */
  26 struct sproc {
  27         struct rproc *rproc;
  28         struct ste_modem_device *mdev;
  29         int error;
  30         void *fw_addr;
  31         size_t fw_size;
  32         dma_addr_t fw_dma_addr;
  33 };
  34
  35 /* STE-Modem firmware entry */
  36 struct ste_toc_entry {
  37         __le32 start;
  38         __le32 size;
  39         __le32 flags;
  40         __le32 entry_point;
  41         __le32 load_addr;
  42         char name[12];
  43 };
  44
  45 /*
  46  * The Table Of Content is located at the start of the firmware image and
  47  * at offset zero in the shared memory region. The resource table typically
  48  * contains the initial boot image (boot strap) and other information elements
  49  * such as remoteproc resource table. Each entry is identified by a unique
  50  * name.
  51  */
  52 struct ste_toc {
  53         struct ste_toc_entry table[SPROC_MAX_TOC_ENTRIES];
  54 };
  55
  56 /* Loads the firmware to shared memory. */
  57 static int sproc_load_segments(struct rproc *rproc, const struct firmware *fw)
  58 {
  59         struct sproc *sproc = rproc->priv;
  60
  61         memcpy(sproc->fw_addr, fw->data, fw->size);
  62
  63         return 0;
  64 }
  65
  66 /* Find the entry for resource table in the Table of Content */
  67 static const struct ste_toc_entry *sproc_find_rsc_entry(const void *data)
  68 {
  69         int i;
  70         const struct ste_toc *toc = data;
  71
  72         /* Search the table for the resource table */
  73         for (i = 0; i < SPROC_MAX_TOC_ENTRIES &&
  74                     toc->table[i].start != 0xffffffff; i++) {
  75                 if (!strncmp(toc->table[i].name, SPROC_RESOURCE_NAME,
  76                              sizeof(toc->table[i].name)))
  77                         return &toc->table[i];
  78         }
  79
  80         return NULL;
  81 }
  82
  83 /* Find the resource table inside the remote processor's firmware. */
  84 static struct resource_table *
  85 sproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
  86                      int *tablesz)
  87 {
  88         struct sproc *sproc = rproc->priv;
  89         struct resource_table *table;
  90         const struct ste_toc_entry *entry;
  91
  92         if (!fw)
  93                 return NULL;
  94
  95         entry = sproc_find_rsc_entry(fw->data);
  96         if (!entry) {
  97                 sproc_err(sproc, "resource table not found in fw\n");
  98                 return NULL;
  99         }
 100
 101         table = (void *)(fw->data + entry->start);
 102
 103         /* sanity check size and offset of resource table */
 104         if (entry->start > SPROC_FW_SIZE ||
 105             entry->size > SPROC_FW_SIZE ||
 106             fw->size > SPROC_FW_SIZE ||
 107             entry->start + entry->size > fw->size ||
 108             sizeof(struct resource_table) > entry->size) {
 109                 sproc_err(sproc, "bad size of fw or resource table\n");
 110                 return NULL;
 111         }
 112
 113         /* we don't support any version beyond the first */
 114         if (table->ver != 1) {
 115                 sproc_err(sproc, "unsupported fw ver: %d\n", table->ver);
 116                 return NULL;
 117         }
 118
 119         /* make sure reserved bytes are zeroes */
 120         if (table->reserved[0] || table->reserved[1]) {
 121                 sproc_err(sproc, "non zero reserved bytes\n");
 122                 return NULL;
 123         }
 124
 125         /* make sure the offsets array isn't truncated */
 126         if (table->num > SPROC_MAX_TOC_ENTRIES ||
 127             table->num * sizeof(table->offset[0]) +
 128             sizeof(struct resource_table) > entry->size) {
 129                 sproc_err(sproc, "resource table incomplete\n");
 130                 return NULL;
 131         }
 132
 133         /* If the fw size has grown, release the previous fw allocation */
 134         if (SPROC_FW_SIZE < fw->size) {
 135                 sproc_err(sproc, "Insufficient space for fw (%d < %zd)\n",
 136                           SPROC_FW_SIZE, fw->size);
 137                 return NULL;
 138         }
 139
 140         sproc->fw_size = fw->size;
 141         *tablesz = entry->size;
 142
 143         return table;
 144 }
 145
 146 /* Find the resource table inside the remote processor's firmware. */
 147 static struct resource_table *
 148 sproc_find_loaded_rsc_table(struct rproc *rproc, const struct firmware *fw)
 149 {
 150         struct sproc *sproc = rproc->priv;
 151         const struct ste_toc_entry *entry;
 152
 153         if (!fw || !sproc->fw_addr)
 154                 return NULL;
 155
 156         entry = sproc_find_rsc_entry(sproc->fw_addr);
 157         if (!entry) {
 158                 sproc_err(sproc, "resource table not found in fw\n");
 159                 return NULL;
 160         }
 161
 162         return sproc->fw_addr + entry->start;
 163 }
 164
 165 /* STE modem firmware handler operations */
 166 static const struct rproc_fw_ops sproc_fw_ops = {
 167         .load = sproc_load_segments,
 168         .find_rsc_table = sproc_find_rsc_table,
 169         .find_loaded_rsc_table = sproc_find_loaded_rsc_table,
 170 };
 171
 172 /* Kick the modem with specified notification id */
 173 static void sproc_kick(struct rproc *rproc, int vqid)
 174 {
 175         struct sproc *sproc = rproc->priv;
 176
 177         sproc_dbg(sproc, "kick vqid:%d\n", vqid);
 178
 179         /*
 180          * We need different notification IDs for RX and TX so add
 181          * an offset on TX notification IDs.
 182          */
 183         sproc->mdev->ops.kick(sproc->mdev, vqid + SPROC_MAX_NOTIFY_ID);
 184 }
 185
 186 /* Received a kick from a modem, kick the virtqueue */
 187 static void sproc_kick_callback(struct ste_modem_device *mdev, int vqid)
 188 {
 189         struct sproc *sproc = mdev->drv_data;
 190
 191         if (rproc_vq_interrupt(sproc->rproc, vqid) == IRQ_NONE)
 192                 sproc_dbg(sproc, "no message was found in vqid %d\n", vqid);
 193 }
 194
 195 static struct ste_modem_dev_cb sproc_dev_cb = {
 196         .kick = sproc_kick_callback,
 197 };
 198
 199 /* Start the STE modem */
 200 static int sproc_start(struct rproc *rproc)
 201 {
 202         struct sproc *sproc = rproc->priv;
 203         int i, err;
 204
 205         sproc_dbg(sproc, "start ste-modem\n");
 206
 207         /* Sanity test the max_notifyid */
 208         if (rproc->max_notifyid > SPROC_MAX_NOTIFY_ID) {
 209                 sproc_err(sproc, "Notification IDs too high:%d\n",
 210                           rproc->max_notifyid);
 211                 return -EINVAL;
 212         }
 213
 214         /* Subscribe to notifications */
 215         for (i = 0; i <= rproc->max_notifyid; i++) {
 216                 err = sproc->mdev->ops.kick_subscribe(sproc->mdev, i);
 217                 if (err) {
 218                         sproc_err(sproc,
 219                                   "subscription of kicks failed:%d\n", err);
 220                         return err;
 221                 }
 222         }
 223
 224         /* Request modem start-up*/
 225         return sproc->mdev->ops.power(sproc->mdev, true);
 226 }
 227
 228 /* Stop the STE modem */
 229 static int sproc_stop(struct rproc *rproc)
 230 {
 231         struct sproc *sproc = rproc->priv;
 232
 233         sproc_dbg(sproc, "stop ste-modem\n");
 234
 235         return sproc->mdev->ops.power(sproc->mdev, false);
 236 }
 237
 238 static struct rproc_ops sproc_ops = {
 239         .start          = sproc_start,
 240         .stop           = sproc_stop,
 241         .kick           = sproc_kick,
 242 };
 243
 244 /* STE modem device is unregistered */
 245 static int sproc_drv_remove(struct platform_device *pdev)
 246 {
 247         struct ste_modem_device *mdev =
 248                 container_of(pdev, struct ste_modem_device, pdev);
 249         struct sproc *sproc = mdev->drv_data;
 250
 251         sproc_dbg(sproc, "remove ste-modem\n");
 252
 253         /* Reset device callback functions */
 254         sproc->mdev->ops.setup(sproc->mdev, NULL);
 255
 256         /* Unregister as remoteproc device */
 257         rproc_del(sproc->rproc);
 258         dma_free_coherent(sproc->rproc->dev.parent, SPROC_FW_SIZE,
 259                           sproc->fw_addr, sproc->fw_dma_addr);
 260         rproc_put(sproc->rproc);
 261
 262         mdev->drv_data = NULL;
 263
 264         return 0;
 265 }
 266
 267 /* Handle probe of a modem device */
 268 static int sproc_probe(struct platform_device *pdev)
 269 {
 270         struct ste_modem_device *mdev =
 271                 container_of(pdev, struct ste_modem_device, pdev);
 272         struct sproc *sproc;
 273         struct rproc *rproc;
 274         int err;
 275
 276         dev_dbg(&mdev->pdev.dev, "probe ste-modem\n");
 277
 278         if (!mdev->ops.setup || !mdev->ops.kick || !mdev->ops.kick_subscribe ||
 279             !mdev->ops.power) {
 280                 dev_err(&mdev->pdev.dev, "invalid mdev ops\n");
 281                 return -EINVAL;
 282         }
 283
 284         rproc = rproc_alloc(&mdev->pdev.dev, mdev->pdev.name, &sproc_ops,
 285                             SPROC_MODEM_FIRMWARE, sizeof(*sproc));
 286         if (!rproc)
 287                 return -ENOMEM;
 288
 289         sproc = rproc->priv;
 290         sproc->mdev = mdev;
 291         sproc->rproc = rproc;
 292         rproc->has_iommu = false;
 293         mdev->drv_data = sproc;
 294
 295         /* Provide callback functions to modem device */
 296         sproc->mdev->ops.setup(sproc->mdev, &sproc_dev_cb);
 297
 298         /* Set the STE-modem specific firmware handler */
 299         rproc->fw_ops = &sproc_fw_ops;
 300
 301         /*
 302          * STE-modem requires the firmware to be located
 303          * at the start of the shared memory region. So we need to
 304          * reserve space for firmware at the start.
 305          */
 306         sproc->fw_addr = dma_alloc_coherent(rproc->dev.parent, SPROC_FW_SIZE,
 307                                             &sproc->fw_dma_addr,
 308                                             GFP_KERNEL);
 309         if (!sproc->fw_addr) {
 310                 sproc_err(sproc, "Cannot allocate memory for fw\n");
 311                 err = -ENOMEM;
 312                 goto free_rproc;
 313         }
 314
 315         /* Register as a remoteproc device */
 316         err = rproc_add(rproc);
 317         if (err)
 318                 goto free_mem;
 319
 320         return 0;
 321
 322 free_mem:
 323         dma_free_coherent(rproc->dev.parent, SPROC_FW_SIZE,
 324                           sproc->fw_addr, sproc->fw_dma_addr);
 325 free_rproc:
 326         /* Reset device data upon error */
 327         mdev->drv_data = NULL;
 328         rproc_put(rproc);
 329         return err;
 330 }
 331
 332 static struct platform_driver sproc_driver = {
 333         .driver = {
 334                 .name   = SPROC_MODEM_NAME,
 335         },
 336         .probe  = sproc_probe,
 337         .remove = sproc_drv_remove,
 338 };
 339
 340 module_platform_driver(sproc_driver);
 341 MODULE_LICENSE("GPL v2");
 342 MODULE_DESCRIPTION("STE Modem driver using the Remote Processor Framework");