1 // SPDX-License-Identifier: GPL-2.0-only 2 /* OMAP SSI driver. 3 * 4 * Copyright (C) 2010 Nokia Corporation. All rights reserved. 5 * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> 6 * 7 * Contact: Carlos Chinea <carlos.chinea@nokia.com> 8 */ 9 10 #include <linux/compiler.h> 11 #include <linux/err.h> 12 #include <linux/ioport.h> 13 #include <linux/io.h> 14 #include <linux/clk.h> 15 #include <linux/device.h> 16 #include <linux/platform_device.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/dmaengine.h> 19 #include <linux/delay.h> 20 #include <linux/seq_file.h> 21 #include <linux/scatterlist.h> 22 #include <linux/interrupt.h> 23 #include <linux/spinlock.h> 24 #include <linux/debugfs.h> 25 #include <linux/pinctrl/consumer.h> 26 #include <linux/pm_runtime.h> 27 #include <linux/of_platform.h> 28 #include <linux/hsi/hsi.h> 29 #include <linux/idr.h> 30 31 #include "omap_ssi_regs.h" 32 #include "omap_ssi.h" 33 34 /* For automatically allocated device IDs */ 35 static DEFINE_IDA(platform_omap_ssi_ida); 36 37 #ifdef CONFIG_DEBUG_FS 38 static int ssi_regs_show(struct seq_file *m, void *p __maybe_unused) 39 { 40 struct hsi_controller *ssi = m->private; 41 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 42 void __iomem *sys = omap_ssi->sys; 43 44 pm_runtime_get_sync(ssi->device.parent); 45 seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG)); 46 seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG)); 47 seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG)); 48 pm_runtime_put(ssi->device.parent); 49 50 return 0; 51 } 52 53 static int ssi_gdd_regs_show(struct seq_file *m, void *p __maybe_unused) 54 { 55 struct hsi_controller *ssi = m->private; 56 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 57 void __iomem *gdd = omap_ssi->gdd; 58 void __iomem *sys = omap_ssi->sys; 59 int lch; 60 61 pm_runtime_get_sync(ssi->device.parent); 62 63 seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n", 64 readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG)); 65 seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n", 66 readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); 67 seq_printf(m, "HW_ID\t\t: 0x%08x\n", 68 readl(gdd + SSI_GDD_HW_ID_REG)); 69 seq_printf(m, "PPORT_ID\t: 0x%08x\n", 70 readl(gdd + SSI_GDD_PPORT_ID_REG)); 71 seq_printf(m, "MPORT_ID\t: 0x%08x\n", 72 readl(gdd + SSI_GDD_MPORT_ID_REG)); 73 seq_printf(m, "TEST\t\t: 0x%08x\n", 74 readl(gdd + SSI_GDD_TEST_REG)); 75 seq_printf(m, "GCR\t\t: 0x%08x\n", 76 readl(gdd + SSI_GDD_GCR_REG)); 77 78 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 79 seq_printf(m, "\nGDD LCH %d\n=========\n", lch); 80 seq_printf(m, "CSDP\t\t: 0x%04x\n", 81 readw(gdd + SSI_GDD_CSDP_REG(lch))); 82 seq_printf(m, "CCR\t\t: 0x%04x\n", 83 readw(gdd + SSI_GDD_CCR_REG(lch))); 84 seq_printf(m, "CICR\t\t: 0x%04x\n", 85 readw(gdd + SSI_GDD_CICR_REG(lch))); 86 seq_printf(m, "CSR\t\t: 0x%04x\n", 87 readw(gdd + SSI_GDD_CSR_REG(lch))); 88 seq_printf(m, "CSSA\t\t: 0x%08x\n", 89 readl(gdd + SSI_GDD_CSSA_REG(lch))); 90 seq_printf(m, "CDSA\t\t: 0x%08x\n", 91 readl(gdd + SSI_GDD_CDSA_REG(lch))); 92 seq_printf(m, "CEN\t\t: 0x%04x\n", 93 readw(gdd + SSI_GDD_CEN_REG(lch))); 94 seq_printf(m, "CSAC\t\t: 0x%04x\n", 95 readw(gdd + SSI_GDD_CSAC_REG(lch))); 96 seq_printf(m, "CDAC\t\t: 0x%04x\n", 97 readw(gdd + SSI_GDD_CDAC_REG(lch))); 98 seq_printf(m, "CLNK_CTRL\t: 0x%04x\n", 99 readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch))); 100 } 101 102 pm_runtime_put(ssi->device.parent); 103 104 return 0; 105 } 106 107 DEFINE_SHOW_ATTRIBUTE(ssi_regs); 108 DEFINE_SHOW_ATTRIBUTE(ssi_gdd_regs); 109 110 static int ssi_debug_add_ctrl(struct hsi_controller *ssi) 111 { 112 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 113 struct dentry *dir; 114 115 /* SSI controller */ 116 omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL); 117 if (!omap_ssi->dir) 118 return -ENOMEM; 119 120 debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, 121 &ssi_regs_fops); 122 /* SSI GDD (DMA) */ 123 dir = debugfs_create_dir("gdd", omap_ssi->dir); 124 if (!dir) 125 goto rback; 126 debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); 127 128 return 0; 129 rback: 130 debugfs_remove_recursive(omap_ssi->dir); 131 132 return -ENOMEM; 133 } 134 135 static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) 136 { 137 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 138 139 debugfs_remove_recursive(omap_ssi->dir); 140 } 141 #endif /* CONFIG_DEBUG_FS */ 142 143 /* 144 * FIXME: Horrible HACK needed until we remove the useless wakeline test 145 * in the CMT. To be removed !!!! 146 */ 147 void ssi_waketest(struct hsi_client *cl, unsigned int enable) 148 { 149 struct hsi_port *port = hsi_get_port(cl); 150 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 151 struct hsi_controller *ssi = to_hsi_controller(port->device.parent); 152 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 153 154 omap_port->wktest = !!enable; 155 if (omap_port->wktest) { 156 pm_runtime_get_sync(ssi->device.parent); 157 writel_relaxed(SSI_WAKE(0), 158 omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); 159 } else { 160 writel_relaxed(SSI_WAKE(0), 161 omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); 162 pm_runtime_put(ssi->device.parent); 163 } 164 } 165 EXPORT_SYMBOL_GPL(ssi_waketest); 166 167 static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) 168 { 169 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 170 struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; 171 struct hsi_port *port = to_hsi_port(msg->cl->device.parent); 172 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 173 unsigned int dir; 174 u32 csr; 175 u32 val; 176 177 spin_lock(&omap_ssi->lock); 178 179 val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 180 val &= ~SSI_GDD_LCH(lch); 181 writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 182 183 if (msg->ttype == HSI_MSG_READ) { 184 dir = DMA_FROM_DEVICE; 185 val = SSI_DATAAVAILABLE(msg->channel); 186 pm_runtime_put(omap_port->pdev); 187 } else { 188 dir = DMA_TO_DEVICE; 189 val = SSI_DATAACCEPT(msg->channel); 190 /* Keep clocks reference for write pio event */ 191 } 192 dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); 193 csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); 194 omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ 195 dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", 196 msg->channel, msg->ttype); 197 spin_unlock(&omap_ssi->lock); 198 if (csr & SSI_CSR_TOUR) { /* Timeout error */ 199 msg->status = HSI_STATUS_ERROR; 200 msg->actual_len = 0; 201 spin_lock(&omap_port->lock); 202 list_del(&msg->link); /* Dequeue msg */ 203 spin_unlock(&omap_port->lock); 204 205 list_add_tail(&msg->link, &omap_port->errqueue); 206 schedule_delayed_work(&omap_port->errqueue_work, 0); 207 return; 208 } 209 spin_lock(&omap_port->lock); 210 val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 211 writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 212 spin_unlock(&omap_port->lock); 213 214 msg->status = HSI_STATUS_COMPLETED; 215 msg->actual_len = sg_dma_len(msg->sgt.sgl); 216 } 217 218 static void ssi_gdd_tasklet(unsigned long dev) 219 { 220 struct hsi_controller *ssi = (struct hsi_controller *)dev; 221 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 222 void __iomem *sys = omap_ssi->sys; 223 unsigned int lch; 224 u32 status_reg; 225 226 pm_runtime_get(ssi->device.parent); 227 228 if (!pm_runtime_active(ssi->device.parent)) { 229 dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n"); 230 pm_runtime_put(ssi->device.parent); 231 return; 232 } 233 234 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 235 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 236 if (status_reg & SSI_GDD_LCH(lch)) 237 ssi_gdd_complete(ssi, lch); 238 } 239 writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); 240 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 241 242 pm_runtime_put(ssi->device.parent); 243 244 if (status_reg) 245 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 246 else 247 enable_irq(omap_ssi->gdd_irq); 248 249 } 250 251 static irqreturn_t ssi_gdd_isr(int irq, void *ssi) 252 { 253 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 254 255 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 256 disable_irq_nosync(irq); 257 258 return IRQ_HANDLED; 259 } 260 261 static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) 262 { 263 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 264 unsigned long rate = clk_get_rate(omap_ssi->fck); 265 return rate; 266 } 267 268 static int ssi_clk_event(struct notifier_block *nb, unsigned long event, 269 void *data) 270 { 271 struct omap_ssi_controller *omap_ssi = container_of(nb, 272 struct omap_ssi_controller, fck_nb); 273 struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev); 274 struct clk_notifier_data *clk_data = data; 275 struct omap_ssi_port *omap_port; 276 int i; 277 278 switch (event) { 279 case PRE_RATE_CHANGE: 280 dev_dbg(&ssi->device, "pre rate change\n"); 281 282 for (i = 0; i < ssi->num_ports; i++) { 283 omap_port = omap_ssi->port[i]; 284 285 if (!omap_port) 286 continue; 287 288 /* Workaround for SWBREAK + CAwake down race in CMT */ 289 disable_irq(omap_port->wake_irq); 290 291 /* stop all ssi communication */ 292 pinctrl_pm_select_idle_state(omap_port->pdev); 293 udelay(1); /* wait for racing frames */ 294 } 295 296 break; 297 case ABORT_RATE_CHANGE: 298 dev_dbg(&ssi->device, "abort rate change\n"); 299 /* Fall through */ 300 case POST_RATE_CHANGE: 301 dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n", 302 clk_data->old_rate, clk_data->new_rate); 303 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* kHz */ 304 305 for (i = 0; i < ssi->num_ports; i++) { 306 omap_port = omap_ssi->port[i]; 307 308 if (!omap_port) 309 continue; 310 311 omap_ssi_port_update_fclk(ssi, omap_port); 312 313 /* resume ssi communication */ 314 pinctrl_pm_select_default_state(omap_port->pdev); 315 enable_irq(omap_port->wake_irq); 316 } 317 318 break; 319 default: 320 break; 321 } 322 323 return NOTIFY_DONE; 324 } 325 326 static int ssi_get_iomem(struct platform_device *pd, 327 const char *name, void __iomem **pbase, dma_addr_t *phy) 328 { 329 struct resource *mem; 330 void __iomem *base; 331 struct hsi_controller *ssi = platform_get_drvdata(pd); 332 333 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); 334 base = devm_ioremap_resource(&ssi->device, mem); 335 if (IS_ERR(base)) 336 return PTR_ERR(base); 337 338 *pbase = base; 339 340 if (phy) 341 *phy = mem->start; 342 343 return 0; 344 } 345 346 static int ssi_add_controller(struct hsi_controller *ssi, 347 struct platform_device *pd) 348 { 349 struct omap_ssi_controller *omap_ssi; 350 int err; 351 352 omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); 353 if (!omap_ssi) 354 return -ENOMEM; 355 356 err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); 357 if (err < 0) 358 goto out_err; 359 ssi->id = err; 360 361 ssi->owner = THIS_MODULE; 362 ssi->device.parent = &pd->dev; 363 dev_set_name(&ssi->device, "ssi%d", ssi->id); 364 hsi_controller_set_drvdata(ssi, omap_ssi); 365 omap_ssi->dev = &ssi->device; 366 err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); 367 if (err < 0) 368 goto out_err; 369 err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); 370 if (err < 0) 371 goto out_err; 372 err = platform_get_irq_byname(pd, "gdd_mpu"); 373 if (err < 0) { 374 dev_err(&pd->dev, "GDD IRQ resource missing\n"); 375 goto out_err; 376 } 377 omap_ssi->gdd_irq = err; 378 tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, 379 (unsigned long)ssi); 380 err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, 381 0, "gdd_mpu", ssi); 382 if (err < 0) { 383 dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", 384 omap_ssi->gdd_irq, err); 385 goto out_err; 386 } 387 388 omap_ssi->port = devm_kcalloc(&ssi->device, ssi->num_ports, 389 sizeof(*omap_ssi->port), GFP_KERNEL); 390 if (!omap_ssi->port) { 391 err = -ENOMEM; 392 goto out_err; 393 } 394 395 omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); 396 if (IS_ERR(omap_ssi->fck)) { 397 dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", 398 PTR_ERR(omap_ssi->fck)); 399 err = -ENODEV; 400 goto out_err; 401 } 402 403 omap_ssi->fck_nb.notifier_call = ssi_clk_event; 404 omap_ssi->fck_nb.priority = INT_MAX; 405 clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb); 406 407 /* TODO: find register, which can be used to detect context loss */ 408 omap_ssi->get_loss = NULL; 409 410 omap_ssi->max_speed = UINT_MAX; 411 spin_lock_init(&omap_ssi->lock); 412 err = hsi_register_controller(ssi); 413 414 if (err < 0) 415 goto out_err; 416 417 return 0; 418 419 out_err: 420 ida_simple_remove(&platform_omap_ssi_ida, ssi->id); 421 return err; 422 } 423 424 static int ssi_hw_init(struct hsi_controller *ssi) 425 { 426 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 427 int err; 428 429 err = pm_runtime_get_sync(ssi->device.parent); 430 if (err < 0) { 431 dev_err(&ssi->device, "runtime PM failed %d\n", err); 432 return err; 433 } 434 /* Resetting GDD */ 435 writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); 436 /* Get FCK rate in kHz */ 437 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); 438 dev_dbg(&ssi->device, "SSI fck rate %lu kHz\n", omap_ssi->fck_rate); 439 440 writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); 441 omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; 442 pm_runtime_put_sync(ssi->device.parent); 443 444 return 0; 445 } 446 447 static void ssi_remove_controller(struct hsi_controller *ssi) 448 { 449 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 450 int id = ssi->id; 451 tasklet_kill(&omap_ssi->gdd_tasklet); 452 hsi_unregister_controller(ssi); 453 clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb); 454 ida_simple_remove(&platform_omap_ssi_ida, id); 455 } 456 457 static inline int ssi_of_get_available_ports_count(const struct device_node *np) 458 { 459 struct device_node *child; 460 int num = 0; 461 462 for_each_available_child_of_node(np, child) 463 if (of_device_is_compatible(child, "ti,omap3-ssi-port")) 464 num++; 465 466 return num; 467 } 468 469 static int ssi_remove_ports(struct device *dev, void *c) 470 { 471 struct platform_device *pdev = to_platform_device(dev); 472 473 if (!dev->of_node) 474 return 0; 475 476 of_node_clear_flag(dev->of_node, OF_POPULATED); 477 of_device_unregister(pdev); 478 479 return 0; 480 } 481 482 static int ssi_probe(struct platform_device *pd) 483 { 484 struct platform_device *childpdev; 485 struct device_node *np = pd->dev.of_node; 486 struct device_node *child; 487 struct hsi_controller *ssi; 488 int err; 489 int num_ports; 490 491 if (!np) { 492 dev_err(&pd->dev, "missing device tree data\n"); 493 return -EINVAL; 494 } 495 496 num_ports = ssi_of_get_available_ports_count(np); 497 498 ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); 499 if (!ssi) { 500 dev_err(&pd->dev, "No memory for controller\n"); 501 return -ENOMEM; 502 } 503 504 platform_set_drvdata(pd, ssi); 505 506 err = ssi_add_controller(ssi, pd); 507 if (err < 0) 508 goto out1; 509 510 pm_runtime_enable(&pd->dev); 511 512 err = ssi_hw_init(ssi); 513 if (err < 0) 514 goto out2; 515 #ifdef CONFIG_DEBUG_FS 516 err = ssi_debug_add_ctrl(ssi); 517 if (err < 0) 518 goto out2; 519 #endif 520 521 for_each_available_child_of_node(np, child) { 522 if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) 523 continue; 524 525 childpdev = of_platform_device_create(child, NULL, &pd->dev); 526 if (!childpdev) { 527 err = -ENODEV; 528 dev_err(&pd->dev, "failed to create ssi controller port\n"); 529 goto out3; 530 } 531 } 532 533 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", 534 ssi->id, num_ports); 535 return err; 536 out3: 537 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 538 out2: 539 ssi_remove_controller(ssi); 540 out1: 541 platform_set_drvdata(pd, NULL); 542 pm_runtime_disable(&pd->dev); 543 544 return err; 545 } 546 547 static int ssi_remove(struct platform_device *pd) 548 { 549 struct hsi_controller *ssi = platform_get_drvdata(pd); 550 551 /* cleanup of of_platform_populate() call */ 552 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 553 554 #ifdef CONFIG_DEBUG_FS 555 ssi_debug_remove_ctrl(ssi); 556 #endif 557 ssi_remove_controller(ssi); 558 platform_set_drvdata(pd, NULL); 559 560 pm_runtime_disable(&pd->dev); 561 562 return 0; 563 } 564 565 #ifdef CONFIG_PM 566 static int omap_ssi_runtime_suspend(struct device *dev) 567 { 568 struct hsi_controller *ssi = dev_get_drvdata(dev); 569 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 570 571 dev_dbg(dev, "runtime suspend!\n"); 572 573 if (omap_ssi->get_loss) 574 omap_ssi->loss_count = 575 omap_ssi->get_loss(ssi->device.parent); 576 577 return 0; 578 } 579 580 static int omap_ssi_runtime_resume(struct device *dev) 581 { 582 struct hsi_controller *ssi = dev_get_drvdata(dev); 583 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 584 585 dev_dbg(dev, "runtime resume!\n"); 586 587 if ((omap_ssi->get_loss) && (omap_ssi->loss_count == 588 omap_ssi->get_loss(ssi->device.parent))) 589 return 0; 590 591 writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); 592 593 return 0; 594 } 595 596 static const struct dev_pm_ops omap_ssi_pm_ops = { 597 SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, 598 NULL) 599 }; 600 601 #define DEV_PM_OPS (&omap_ssi_pm_ops) 602 #else 603 #define DEV_PM_OPS NULL 604 #endif 605 606 #ifdef CONFIG_OF 607 static const struct of_device_id omap_ssi_of_match[] = { 608 { .compatible = "ti,omap3-ssi", }, 609 {}, 610 }; 611 MODULE_DEVICE_TABLE(of, omap_ssi_of_match); 612 #else 613 #define omap_ssi_of_match NULL 614 #endif 615 616 static struct platform_driver ssi_pdriver = { 617 .probe = ssi_probe, 618 .remove = ssi_remove, 619 .driver = { 620 .name = "omap_ssi", 621 .pm = DEV_PM_OPS, 622 .of_match_table = omap_ssi_of_match, 623 }, 624 }; 625 626 static int __init ssi_init(void) { 627 int ret; 628 629 ret = platform_driver_register(&ssi_pdriver); 630 if (ret) 631 return ret; 632 633 return platform_driver_register(&ssi_port_pdriver); 634 } 635 module_init(ssi_init); 636 637 static void __exit ssi_exit(void) { 638 platform_driver_unregister(&ssi_port_pdriver); 639 platform_driver_unregister(&ssi_pdriver); 640 } 641 module_exit(ssi_exit); 642 643 MODULE_ALIAS("platform:omap_ssi"); 644 MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); 645 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); 646 MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); 647 MODULE_LICENSE("GPL v2"); 648