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->peripherals = kmalloc(struct_size(ctx->peripherals, array, num_slaves),
 256                                    GFP_KERNEL);
 257         if (!ctx->peripherals)
 258                 goto err;
 259         ctx->peripherals->num_peripherals = 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->peripherals->array[i] = slave;
 265                         i++;
 266                 }
 267         }
 268
 269         return ctx;
 270
 271 err:
 272         while (i--) {
 273                 if (!(link_mask & BIT(i)))
 274                         continue;
 275                 ldev = ctx->ldev[i];
 276                 intel_link_dev_unregister(ldev);
 277         }
 278         kfree(ctx->ldev);
 279         kfree(ctx);
 280         return NULL;
 281 }
 282
 283 static int
 284 sdw_intel_startup_controller(struct sdw_intel_ctx *ctx)
 285 {
 286         struct acpi_device *adev = acpi_fetch_acpi_dev(ctx->handle);
 287         struct sdw_intel_link_dev *ldev;
 288         u32 link_mask;
 289         int i;
 290
 291         if (!adev)
 292                 return -EINVAL;
 293
 294         if (!ctx->ldev)
 295                 return -EINVAL;
 296
 297         link_mask = ctx->link_mask;
 298
 299         /* Startup SDW Master devices */
 300         for (i = 0; i < ctx->count; i++) {
 301                 if (!(link_mask & BIT(i)))
 302                         continue;
 303
 304                 ldev = ctx->ldev[i];
 305
 306                 intel_link_startup(&ldev->auxdev);
 307
 308                 if (!ldev->link_res.clock_stop_quirks) {
 309                         /*
 310                          * we need to prevent the parent PCI device
 311                          * from entering pm_runtime suspend, so that
 312                          * power rails to the SoundWire IP are not
 313                          * turned off.
 314                          */
 315                         pm_runtime_get_noresume(ldev->link_res.dev);
 316                 }
 317         }
 318
 319         return 0;
 320 }
 321
 322 /**
 323  * sdw_intel_probe() - SoundWire Intel probe routine
 324  * @res: resource data
 325  *
 326  * This registers an auxiliary device for each Master handled by the controller,
 327  * and SoundWire Master and Slave devices will be created by the auxiliary
 328  * device probe. All the information necessary is stored in the context, and
 329  * the res argument pointer can be freed after this step.
 330  * This function will be called after sdw_intel_acpi_scan() by SOF probe.
 331  */
 332 struct sdw_intel_ctx
 333 *sdw_intel_probe(struct sdw_intel_res *res)
 334 {
 335         return sdw_intel_probe_controller(res);
 336 }
 337 EXPORT_SYMBOL_NS(sdw_intel_probe, "SOUNDWIRE_INTEL_INIT");
 338
 339 /**
 340  * sdw_intel_startup() - SoundWire Intel startup
 341  * @ctx: SoundWire context allocated in the probe
 342  *
 343  * Startup Intel SoundWire controller. This function will be called after
 344  * Intel Audio DSP is powered up.
 345  */
 346 int sdw_intel_startup(struct sdw_intel_ctx *ctx)
 347 {
 348         return sdw_intel_startup_controller(ctx);
 349 }
 350 EXPORT_SYMBOL_NS(sdw_intel_startup, "SOUNDWIRE_INTEL_INIT");
 351 /**
 352  * sdw_intel_exit() - SoundWire Intel exit
 353  * @ctx: SoundWire context allocated in the probe
 354  *
 355  * Delete the controller instances created and cleanup
 356  */
 357 void sdw_intel_exit(struct sdw_intel_ctx *ctx)
 358 {
 359         struct sdw_intel_link_res *link;
 360
 361         /* we first resume links and devices and wait synchronously before the cleanup */
 362         list_for_each_entry(link, &ctx->link_list, list) {
 363                 struct sdw_bus *bus = &link->cdns->bus;
 364                 int ret;
 365
 366                 ret = device_for_each_child(bus->dev, NULL, intel_resume_child_device);
 367                 if (ret < 0)
 368                         dev_err(bus->dev, "%s: intel_resume_child_device failed: %d\n",
 369                                 __func__, ret);
 370         }
 371
 372         sdw_intel_cleanup(ctx);
 373         kfree(ctx->peripherals);
 374         kfree(ctx->ldev);
 375         kfree(ctx);
 376 }
 377 EXPORT_SYMBOL_NS(sdw_intel_exit, "SOUNDWIRE_INTEL_INIT");
 378
 379 void sdw_intel_process_wakeen_event(struct sdw_intel_ctx *ctx)
 380 {
 381         struct sdw_intel_link_dev *ldev;
 382         u32 link_mask;
 383         int i;
 384
 385         if (!ctx->ldev)
 386                 return;
 387
 388         link_mask = ctx->link_mask;
 389
 390         /* Startup SDW Master devices */
 391         for (i = 0; i < ctx->count; i++) {
 392                 if (!(link_mask & BIT(i)))
 393                         continue;
 394
 395                 ldev = ctx->ldev[i];
 396
 397                 intel_link_process_wakeen_event(&ldev->auxdev);
 398         }
 399 }
 400 EXPORT_SYMBOL_NS(sdw_intel_process_wakeen_event, "SOUNDWIRE_INTEL_INIT");
 401
 402 MODULE_LICENSE("Dual BSD/GPL");
 403 MODULE_DESCRIPTION("Intel Soundwire Init Library");