drivers/soundwire/intel_init.c

   1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
   2 // Copyright(c) 2015-17 Intel Corporation.
   3
   4 /*
   5  * SDW Intel Init Routines
   6  *
   7  * Initializes and creates SDW devices based on ACPI and Hardware values
   8  */
   9
  10 #include <linux/acpi.h>
  11 #include <linux/export.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/module.h>
  15 #include <linux/auxiliary_bus.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/soundwire/sdw_intel.h>
  18 #include "cadence_master.h"
  19 #include "bus.h"
  20 #include "intel.h"
  21 #include "intel_auxdevice.h"
  22
  23 static void intel_link_dev_release(struct device *dev)
  24 {
  25         struct auxiliary_device *auxdev = to_auxiliary_dev(dev);
  26         struct sdw_intel_link_dev *ldev = auxiliary_dev_to_sdw_intel_link_dev(auxdev);
  27
  28         kfree(ldev);
  29 }
  30
  31 /* alloc, init and add link devices */
  32 static struct sdw_intel_link_dev *intel_link_dev_register(struct sdw_intel_res *res,
  33                                                           struct sdw_intel_ctx *ctx,
  34                                                           struct fwnode_handle *fwnode,
  35                                                           const char *name,
  36                                                           int link_id)
  37 {
  38         struct sdw_intel_link_dev *ldev;
  39         struct sdw_intel_link_res *link;
  40         struct auxiliary_device *auxdev;
  41         int ret;
  42
  43         ldev = kzalloc(sizeof(*ldev), GFP_KERNEL);
  44         if (!ldev)
  45                 return ERR_PTR(-ENOMEM);
  46
  47         auxdev = &ldev->auxdev;
  48         auxdev->name = name;
  49         auxdev->dev.parent = res->parent;
  50         auxdev->dev.fwnode = fwnode;
  51         auxdev->dev.release = intel_link_dev_release;
  52
  53         /* we don't use an IDA since we already have a link ID */
  54         auxdev->id = link_id;
  55
  56         /*
  57          * keep a handle on the allocated memory, to be used in all other functions.
  58          * Since the same pattern is used to skip links that are not enabled, there is
  59          * no need to check if ctx->ldev[i] is NULL later on.
  60          */
  61         ctx->ldev[link_id] = ldev;
  62
  63         /* Add link information used in the driver probe */
  64         link = &ldev->link_res;
  65         link->hw_ops = res->hw_ops;
  66         link->mmio_base = res->mmio_base;
  67         if (!res->ext) {
  68                 link->registers = res->mmio_base + SDW_LINK_BASE
  69                         + (SDW_LINK_SIZE * link_id);
  70                 link->ip_offset = 0;
  71                 link->shim = res->mmio_base + res->shim_base;
  72                 link->alh = res->mmio_base + res->alh_base;
  73                 link->shim_lock = &ctx->shim_lock;
  74         } else {
  75                 link->registers = res->mmio_base + SDW_IP_BASE(link_id);
  76                 link->ip_offset = SDW_CADENCE_MCP_IP_OFFSET;
  77                 link->shim = res->mmio_base +  SDW_SHIM2_GENERIC_BASE(link_id);
  78                 link->shim_vs = res->mmio_base + SDW_SHIM2_VS_BASE(link_id);
  79                 link->shim_lock = res->eml_lock;
  80         }
  81
  82         link->ops = res->ops;
  83         link->dev = res->dev;
  84
  85         link->clock_stop_quirks = res->clock_stop_quirks;
  86         link->shim_mask = &ctx->shim_mask;
  87         link->link_mask = ctx->link_mask;
  88
  89         link->hbus = res->hbus;
  90
  91         /* now follow the two-step init/add sequence */
  92         ret = auxiliary_device_init(auxdev);
  93         if (ret < 0) {
  94                 dev_err(res->parent, "failed to initialize link dev %s link_id %d\n",
  95                         name, link_id);
  96                 kfree(ldev);
  97                 return ERR_PTR(ret);
  98         }
  99
 100         ret = auxiliary_device_add(&ldev->auxdev);
 101         if (ret < 0) {
 102                 dev_err(res->parent, "failed to add link dev %s link_id %d\n",
 103                         ldev->auxdev.name, link_id);
 104                 /* ldev will be freed with the put_device() and .release sequence */
 105                 auxiliary_device_uninit(&ldev->auxdev);
 106                 return ERR_PTR(ret);
 107         }
 108
 109         return ldev;
 110 }
 111
 112 static void intel_link_dev_unregister(struct sdw_intel_link_dev *ldev)
 113 {
 114         auxiliary_device_delete(&ldev->auxdev);
 115         auxiliary_device_uninit(&ldev->auxdev);
 116 }
 117
 118 static int sdw_intel_cleanup(struct sdw_intel_ctx *ctx)
 119 {
 120         struct sdw_intel_link_dev *ldev;
 121         u32 link_mask;
 122         int i;
 123
 124         link_mask = ctx->link_mask;
 125
 126         for (i = 0; i < ctx->count; i++) {
 127                 if (!(link_mask & BIT(i)))
 128                         continue;
 129
 130                 ldev = ctx->ldev[i];
 131
 132                 pm_runtime_disable(&ldev->auxdev.dev);
 133                 if (!ldev->link_res.clock_stop_quirks)
 134                         pm_runtime_put_noidle(ldev->link_res.dev);
 135
 136                 intel_link_dev_unregister(ldev);
 137         }
 138
 139         return 0;
 140 }
 141
 142 irqreturn_t sdw_intel_thread(int irq, void *dev_id)
 143 {
 144         struct sdw_intel_ctx *ctx = dev_id;
 145         struct sdw_intel_link_res *link;
 146
 147         list_for_each_entry(link, &ctx->link_list, list)
 148                 sdw_cdns_irq(irq, link->cdns);
 149
 150         return IRQ_HANDLED;
 151 }
 152 EXPORT_SYMBOL_NS(sdw_intel_thread, SOUNDWIRE_INTEL_INIT);
 153
 154 static struct sdw_intel_ctx
 155 *sdw_intel_probe_controller(struct sdw_intel_res *res)
 156 {
 157         struct sdw_intel_link_res *link;
 158         struct sdw_intel_link_dev *ldev;
 159         struct sdw_intel_ctx *ctx;
 160         struct acpi_device *adev;
 161         struct sdw_slave *slave;
 162         struct list_head *node;
 163         struct sdw_bus *bus;
 164         u32 link_mask;
 165         int num_slaves = 0;
 166         int count;
 167         int i;
 168
 169         if (!res)
 170                 return NULL;
 171
 172         adev = acpi_fetch_acpi_dev(res->handle);
 173         if (!adev)
 174                 return NULL;
 175
 176         if (!res->count)
 177                 return NULL;
 178
 179         count = res->count;
 180         dev_dbg(&adev->dev, "Creating %d SDW Link devices\n", count);
 181
 182         /*
 183          * we need to alloc/free memory manually and can't use devm:
 184          * this routine may be called from a workqueue, and not from
 185          * the parent .probe.
 186          * If devm_ was used, the memory might never be freed on errors.
 187          */
 188         ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
 189         if (!ctx)
 190                 return NULL;
 191
 192         ctx->count = count;
 193
 194         /*
 195          * allocate the array of pointers. The link-specific data is allocated
 196          * as part of the first loop below and released with the auxiliary_device_uninit().
 197          * If some links are disabled, the link pointer will remain NULL. Given that the
 198          * number of links is small, this is simpler than using a list to keep track of links.
 199          */
 200         ctx->ldev = kcalloc(ctx->count, sizeof(*ctx->ldev), GFP_KERNEL);
 201         if (!ctx->ldev) {
 202                 kfree(ctx);
 203                 return NULL;
 204         }
 205
 206         ctx->mmio_base = res->mmio_base;
 207         ctx->shim_base = res->shim_base;
 208         ctx->alh_base = res->alh_base;
 209         ctx->link_mask = res->link_mask;
 210         ctx->handle = res->handle;
 211         mutex_init(&ctx->shim_lock);
 212
 213         link_mask = ctx->link_mask;
 214
 215         INIT_LIST_HEAD(&ctx->link_list);
 216
 217         for (i = 0; i < count; i++) {
 218                 if (!(link_mask & BIT(i)))
 219                         continue;
 220
 221                 /*
 222                  * init and add a device for each link
 223                  *
 224                  * The name of the device will be soundwire_intel.link.[i],
 225                  * with the "soundwire_intel" module prefix automatically added
 226                  * by the auxiliary bus core.
 227                  */
 228                 ldev = intel_link_dev_register(res,
 229                                                ctx,
 230                                                acpi_fwnode_handle(adev),
 231                                                "link",
 232                                                i);
 233                 if (IS_ERR(ldev))
 234                         goto err;
 235
 236                 link = &ldev->link_res;
 237                 link->cdns = auxiliary_get_drvdata(&ldev->auxdev);
 238
 239                 if (!link->cdns) {
 240                         dev_err(&adev->dev, "failed to get link->cdns\n");
 241                         /*
 242                          * 1 will be subtracted from i in the err label, but we need to call
 243                          * intel_link_dev_unregister for this ldev, so plus 1 now
 244                          */
 245                         i++;
 246                         goto err;
 247                 }
 248                 list_add_tail(&link->list, &ctx->link_list);
 249                 bus = &link->cdns->bus;
 250                 /* Calculate number of slaves */
 251                 list_for_each(node, &bus->slaves)
 252                         num_slaves++;
 253         }
 254
 255         ctx->ids = kcalloc(num_slaves, sizeof(*ctx->ids), GFP_KERNEL);
 256         if (!ctx->ids)
 257                 goto err;
 258
 259         ctx->num_slaves = num_slaves;
 260         i = 0;
 261         list_for_each_entry(link, &ctx->link_list, list) {
 262                 bus = &link->cdns->bus;
 263                 list_for_each_entry(slave, &bus->slaves, node) {
 264                         ctx->ids[i].id = slave->id;
 265                         ctx->ids[i].link_id = bus->link_id;
 266                         i++;
 267                 }
 268         }
 269
 270         return ctx;
 271
 272 err:
 273         while (i--) {
 274                 if (!(link_mask & BIT(i)))
 275                         continue;
 276                 ldev = ctx->ldev[i];
 277                 intel_link_dev_unregister(ldev);
 278         }
 279         kfree(ctx->ldev);
 280         kfree(ctx);
 281         return NULL;
 282 }
 283
 284 static int
 285 sdw_intel_startup_controller(struct sdw_intel_ctx *ctx)
 286 {
 287         struct acpi_device *adev = acpi_fetch_acpi_dev(ctx->handle);
 288         struct sdw_intel_link_dev *ldev;
 289         u32 link_mask;
 290         int i;
 291
 292         if (!adev)
 293                 return -EINVAL;
 294
 295         if (!ctx->ldev)
 296                 return -EINVAL;
 297
 298         link_mask = ctx->link_mask;
 299
 300         /* Startup SDW Master devices */
 301         for (i = 0; i < ctx->count; i++) {
 302                 if (!(link_mask & BIT(i)))
 303                         continue;
 304
 305                 ldev = ctx->ldev[i];
 306
 307                 intel_link_startup(&ldev->auxdev);
 308
 309                 if (!ldev->link_res.clock_stop_quirks) {
 310                         /*
 311                          * we need to prevent the parent PCI device
 312                          * from entering pm_runtime suspend, so that
 313                          * power rails to the SoundWire IP are not
 314                          * turned off.
 315                          */
 316                         pm_runtime_get_noresume(ldev->link_res.dev);
 317                 }
 318         }
 319
 320         return 0;
 321 }
 322
 323 /**
 324  * sdw_intel_probe() - SoundWire Intel probe routine
 325  * @res: resource data
 326  *
 327  * This registers an auxiliary device for each Master handled by the controller,
 328  * and SoundWire Master and Slave devices will be created by the auxiliary
 329  * device probe. All the information necessary is stored in the context, and
 330  * the res argument pointer can be freed after this step.
 331  * This function will be called after sdw_intel_acpi_scan() by SOF probe.
 332  */
 333 struct sdw_intel_ctx
 334 *sdw_intel_probe(struct sdw_intel_res *res)
 335 {
 336         return sdw_intel_probe_controller(res);
 337 }
 338 EXPORT_SYMBOL_NS(sdw_intel_probe, SOUNDWIRE_INTEL_INIT);
 339
 340 /**
 341  * sdw_intel_startup() - SoundWire Intel startup
 342  * @ctx: SoundWire context allocated in the probe
 343  *
 344  * Startup Intel SoundWire controller. This function will be called after
 345  * Intel Audio DSP is powered up.
 346  */
 347 int sdw_intel_startup(struct sdw_intel_ctx *ctx)
 348 {
 349         return sdw_intel_startup_controller(ctx);
 350 }
 351 EXPORT_SYMBOL_NS(sdw_intel_startup, SOUNDWIRE_INTEL_INIT);
 352 /**
 353  * sdw_intel_exit() - SoundWire Intel exit
 354  * @ctx: SoundWire context allocated in the probe
 355  *
 356  * Delete the controller instances created and cleanup
 357  */
 358 void sdw_intel_exit(struct sdw_intel_ctx *ctx)
 359 {
 360         struct sdw_intel_link_res *link;
 361
 362         /* we first resume links and devices and wait synchronously before the cleanup */
 363         list_for_each_entry(link, &ctx->link_list, list) {
 364                 struct sdw_bus *bus = &link->cdns->bus;
 365                 int ret;
 366
 367                 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
 368                 if (ret < 0)
 369                         dev_err(bus->dev, "%s: intel_resume_child_device failed: %d\n",
 370                                 __func__, ret);
 371         }
 372
 373         sdw_intel_cleanup(ctx);
 374         kfree(ctx->ids);
 375         kfree(ctx->ldev);
 376         kfree(ctx);
 377 }
 378 EXPORT_SYMBOL_NS(sdw_intel_exit, SOUNDWIRE_INTEL_INIT);
 379
 380 void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx)
 381 {
 382         struct sdw_intel_link_dev *ldev;
 383         u32 link_mask;
 384         int i;
 385
 386         if (!ctx->ldev)
 387                 return;
 388
 389         link_mask = ctx->link_mask;
 390
 391         /* Startup SDW Master devices */
 392         for (i = 0; i < ctx->count; i++) {
 393                 if (!(link_mask & BIT(i)))
 394                         continue;
 395
 396                 ldev = ctx->ldev[i];
 397
 398                 intel_link_process_wakeen_event(&ldev->auxdev);
 399         }
 400 }
 401 EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, SOUNDWIRE_INTEL_INIT);
 402
 403 MODULE_LICENSE("Dual BSD/GPL");
 404 MODULE_DESCRIPTION("Intel Soundwire Init Library");