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 struct ste_toc_entry *sproc_find_rsc_entry(const struct firmware *fw)
  68 {
  69         int i;
  70         struct ste_toc *toc;
  71
  72         if (!fw)
  73                 return NULL;
  74
  75         toc = (void *)fw->data;
  76
  77         /* Search the table for the resource table */
  78         for (i = 0; i < SPROC_MAX_TOC_ENTRIES &&
  79                     toc->table[i].start != 0xffffffff; i++) {
  80
  81                 if (!strncmp(toc->table[i].name, SPROC_RESOURCE_NAME,
  82                              sizeof(toc->table[i].name))) {
  83                         if (toc->table[i].start > fw->size)
  84                                 return NULL;
  85                         return &toc->table[i];
  86                 }
  87         }
  88
  89         return NULL;
  90 }
  91
  92 /* Find the resource table inside the remote processor's firmware. */
  93 static struct resource_table *
  94 sproc_find_rsc_table(struct rproc *rproc, const struct firmware *fw,
  95                      int *tablesz)
  96 {
  97         struct sproc *sproc = rproc->priv;
  98         struct resource_table *table;
  99         struct ste_toc_entry *entry;
 100
 101         entry = sproc_find_rsc_entry(fw);
 102         if (!entry) {
 103                 sproc_err(sproc, "resource table not found in fw\n");
 104                 return NULL;
 105         }
 106
 107         table = (void *)(fw->data + entry->start);
 108
 109         /* sanity check size and offset of resource table */
 110         if (entry->start > SPROC_FW_SIZE ||
 111             entry->size > SPROC_FW_SIZE ||
 112             fw->size > SPROC_FW_SIZE ||
 113             entry->start + entry->size > fw->size ||
 114             sizeof(struct resource_table) > entry->size) {
 115                 sproc_err(sproc, "bad size of fw or resource table\n");
 116                 return NULL;
 117         }
 118
 119         /* we don't support any version beyond the first */
 120         if (table->ver != 1) {
 121                 sproc_err(sproc, "unsupported fw ver: %d\n", table->ver);
 122                 return NULL;
 123         }
 124
 125         /* make sure reserved bytes are zeroes */
 126         if (table->reserved[0] || table->reserved[1]) {
 127                 sproc_err(sproc, "non zero reserved bytes\n");
 128                 return NULL;
 129         }
 130
 131         /* make sure the offsets array isn't truncated */
 132         if (table->num > SPROC_MAX_TOC_ENTRIES ||
 133             table->num * sizeof(table->offset[0]) +
 134             sizeof(struct resource_table) > entry->size) {
 135                 sproc_err(sproc, "resource table incomplete\n");
 136                 return NULL;
 137         }
 138
 139         /* If the fw size has grown, release the previous fw allocation */
 140         if (SPROC_FW_SIZE < fw->size) {
 141                 sproc_err(sproc, "Insufficient space for fw (%d < %zd)\n",
 142                           SPROC_FW_SIZE, fw->size);
 143                 return NULL;
 144         }
 145
 146         sproc->fw_size = fw->size;
 147         *tablesz = entry->size;
 148
 149         return table;
 150 }
 151
 152 /* STE modem firmware handler operations */
 153 const struct rproc_fw_ops sproc_fw_ops = {
 154         .load = sproc_load_segments,
 155         .find_rsc_table = sproc_find_rsc_table,
 156 };
 157
 158 /* Kick the modem with specified notification id */
 159 static void sproc_kick(struct rproc *rproc, int vqid)
 160 {
 161         struct sproc *sproc = rproc->priv;
 162
 163         sproc_dbg(sproc, "kick vqid:%d\n", vqid);
 164
 165         /*
 166          * We need different notification IDs for RX and TX so add
 167          * an offset on TX notification IDs.
 168          */
 169         sproc->mdev->ops.kick(sproc->mdev, vqid + SPROC_MAX_NOTIFY_ID);
 170 }
 171
 172 /* Received a kick from a modem, kick the virtqueue */
 173 static void sproc_kick_callback(struct ste_modem_device *mdev, int vqid)
 174 {
 175         struct sproc *sproc = mdev->drv_data;
 176
 177         if (rproc_vq_interrupt(sproc->rproc, vqid) == IRQ_NONE)
 178                 sproc_dbg(sproc, "no message was found in vqid %d\n", vqid);
 179 }
 180
 181 struct ste_modem_dev_cb sproc_dev_cb = {
 182         .kick = sproc_kick_callback,
 183 };
 184
 185 /* Start the STE modem */
 186 static int sproc_start(struct rproc *rproc)
 187 {
 188         struct sproc *sproc = rproc->priv;
 189         int i, err;
 190
 191         sproc_dbg(sproc, "start ste-modem\n");
 192
 193         /* Sanity test the max_notifyid */
 194         if (rproc->max_notifyid > SPROC_MAX_NOTIFY_ID) {
 195                 sproc_err(sproc, "Notification IDs too high:%d\n",
 196                           rproc->max_notifyid);
 197                 return -EINVAL;
 198         }
 199
 200         /* Subscribe to notifications */
 201         for (i = 0; i < rproc->max_notifyid; i++) {
 202                 err = sproc->mdev->ops.kick_subscribe(sproc->mdev, i);
 203                 if (err) {
 204                         sproc_err(sproc,
 205                                   "subscription of kicks failed:%d\n", err);
 206                         return err;
 207                 }
 208         }
 209
 210         /* Request modem start-up*/
 211         return sproc->mdev->ops.power(sproc->mdev, true);
 212 }
 213
 214 /* Stop the STE modem */
 215 static int sproc_stop(struct rproc *rproc)
 216 {
 217         struct sproc *sproc = rproc->priv;
 218         sproc_dbg(sproc, "stop ste-modem\n");
 219
 220         return sproc->mdev->ops.power(sproc->mdev, false);
 221 }
 222
 223 static struct rproc_ops sproc_ops = {
 224         .start          = sproc_start,
 225         .stop           = sproc_stop,
 226         .kick           = sproc_kick,
 227 };
 228
 229 /* STE modem device is unregistered */
 230 static int sproc_drv_remove(struct platform_device *pdev)
 231 {
 232         struct ste_modem_device *mdev =
 233                 container_of(pdev, struct ste_modem_device, pdev);
 234         struct sproc *sproc = mdev->drv_data;
 235
 236         sproc_dbg(sproc, "remove ste-modem\n");
 237
 238         /* Reset device callback functions */
 239         sproc->mdev->ops.setup(sproc->mdev, NULL);
 240
 241         /* Unregister as remoteproc device */
 242         rproc_del(sproc->rproc);
 243         rproc_put(sproc->rproc);
 244
 245         mdev->drv_data = NULL;
 246
 247         return 0;
 248 }
 249
 250 /* Handle probe of a modem device */
 251 static int sproc_probe(struct platform_device *pdev)
 252 {
 253         struct ste_modem_device *mdev =
 254                 container_of(pdev, struct ste_modem_device, pdev);
 255         struct sproc *sproc;
 256         struct rproc *rproc;
 257         int err;
 258
 259         dev_dbg(&mdev->pdev.dev, "probe ste-modem\n");
 260
 261         if (!mdev->ops.setup || !mdev->ops.kick || !mdev->ops.kick_subscribe ||
 262             !mdev->ops.power) {
 263                 dev_err(&mdev->pdev.dev, "invalid mdev ops\n");
 264                 return -EINVAL;
 265         }
 266
 267         rproc = rproc_alloc(&mdev->pdev.dev, mdev->pdev.name, &sproc_ops,
 268                             SPROC_MODEM_FIRMWARE, sizeof(*sproc));
 269         if (!rproc)
 270                 return -ENOMEM;
 271
 272         sproc = rproc->priv;
 273         sproc->mdev = mdev;
 274         sproc->rproc = rproc;
 275         mdev->drv_data = sproc;
 276
 277         /* Provide callback functions to modem device */
 278         sproc->mdev->ops.setup(sproc->mdev, &sproc_dev_cb);
 279
 280         /* Set the STE-modem specific firmware handler */
 281         rproc->fw_ops = &sproc_fw_ops;
 282
 283         /*
 284          * STE-modem requires the firmware to be located
 285          * at the start of the shared memory region. So we need to
 286          * reserve space for firmware at the start.
 287          */
 288         sproc->fw_addr = dma_alloc_coherent(rproc->dev.parent, SPROC_FW_SIZE,
 289                                             &sproc->fw_dma_addr,
 290                                             GFP_KERNEL);
 291         if (!sproc->fw_addr) {
 292                 sproc_err(sproc, "Cannot allocate memory for fw\n");
 293                 err = -ENOMEM;
 294                 goto free_rproc;
 295         }
 296
 297         /* Register as a remoteproc device */
 298         err = rproc_add(rproc);
 299         if (err)
 300                 goto free_rproc;
 301
 302         return 0;
 303
 304 free_rproc:
 305         /* Reset device data upon error */
 306         mdev->drv_data = NULL;
 307         rproc_put(rproc);
 308         return err;
 309 }
 310
 311 static struct platform_driver sproc_driver = {
 312         .driver = {
 313                 .name   = SPROC_MODEM_NAME,
 314                 .owner  = THIS_MODULE,
 315         },
 316         .probe  = sproc_probe,
 317         .remove = sproc_drv_remove,
 318 };
 319
 320 module_platform_driver(sproc_driver);
 321 MODULE_LICENSE("GPL v2");
 322 MODULE_DESCRIPTION("STE Modem driver using the Remote Processor Framework");