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/hsi/ssi_protocol.h> 21 #include <linux/seq_file.h> 22 #include <linux/scatterlist.h> 23 #include <linux/interrupt.h> 24 #include <linux/spinlock.h> 25 #include <linux/debugfs.h> 26 #include <linux/pinctrl/consumer.h> 27 #include <linux/pm_runtime.h> 28 #include <linux/of.h> 29 #include <linux/of_platform.h> 30 #include <linux/hsi/hsi.h> 31 #include <linux/idr.h> 32 33 #include "omap_ssi_regs.h" 34 #include "omap_ssi.h" 35 36 /* For automatically allocated device IDs */ 37 static DEFINE_IDA(platform_omap_ssi_ida); 38 39 #ifdef CONFIG_DEBUG_FS 40 static int ssi_regs_show(struct seq_file *m, void *p __maybe_unused) 41 { 42 struct hsi_controller *ssi = m->private; 43 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 44 void __iomem *sys = omap_ssi->sys; 45 46 pm_runtime_get_sync(ssi->device.parent); 47 seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG)); 48 seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG)); 49 seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG)); 50 pm_runtime_put(ssi->device.parent); 51 52 return 0; 53 } 54 55 static int ssi_gdd_regs_show(struct seq_file *m, void *p __maybe_unused) 56 { 57 struct hsi_controller *ssi = m->private; 58 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 59 void __iomem *gdd = omap_ssi->gdd; 60 void __iomem *sys = omap_ssi->sys; 61 int lch; 62 63 pm_runtime_get_sync(ssi->device.parent); 64 65 seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n", 66 readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG)); 67 seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n", 68 readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); 69 seq_printf(m, "HW_ID\t\t: 0x%08x\n", 70 readl(gdd + SSI_GDD_HW_ID_REG)); 71 seq_printf(m, "PPORT_ID\t: 0x%08x\n", 72 readl(gdd + SSI_GDD_PPORT_ID_REG)); 73 seq_printf(m, "MPORT_ID\t: 0x%08x\n", 74 readl(gdd + SSI_GDD_MPORT_ID_REG)); 75 seq_printf(m, "TEST\t\t: 0x%08x\n", 76 readl(gdd + SSI_GDD_TEST_REG)); 77 seq_printf(m, "GCR\t\t: 0x%08x\n", 78 readl(gdd + SSI_GDD_GCR_REG)); 79 80 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 81 seq_printf(m, "\nGDD LCH %d\n=========\n", lch); 82 seq_printf(m, "CSDP\t\t: 0x%04x\n", 83 readw(gdd + SSI_GDD_CSDP_REG(lch))); 84 seq_printf(m, "CCR\t\t: 0x%04x\n", 85 readw(gdd + SSI_GDD_CCR_REG(lch))); 86 seq_printf(m, "CICR\t\t: 0x%04x\n", 87 readw(gdd + SSI_GDD_CICR_REG(lch))); 88 seq_printf(m, "CSR\t\t: 0x%04x\n", 89 readw(gdd + SSI_GDD_CSR_REG(lch))); 90 seq_printf(m, "CSSA\t\t: 0x%08x\n", 91 readl(gdd + SSI_GDD_CSSA_REG(lch))); 92 seq_printf(m, "CDSA\t\t: 0x%08x\n", 93 readl(gdd + SSI_GDD_CDSA_REG(lch))); 94 seq_printf(m, "CEN\t\t: 0x%04x\n", 95 readw(gdd + SSI_GDD_CEN_REG(lch))); 96 seq_printf(m, "CSAC\t\t: 0x%04x\n", 97 readw(gdd + SSI_GDD_CSAC_REG(lch))); 98 seq_printf(m, "CDAC\t\t: 0x%04x\n", 99 readw(gdd + SSI_GDD_CDAC_REG(lch))); 100 seq_printf(m, "CLNK_CTRL\t: 0x%04x\n", 101 readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch))); 102 } 103 104 pm_runtime_put(ssi->device.parent); 105 106 return 0; 107 } 108 109 DEFINE_SHOW_ATTRIBUTE(ssi_regs); 110 DEFINE_SHOW_ATTRIBUTE(ssi_gdd_regs); 111 112 static int ssi_debug_add_ctrl(struct hsi_controller *ssi) 113 { 114 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 115 struct dentry *dir; 116 117 /* SSI controller */ 118 omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL); 119 debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, &ssi_regs_fops); 120 121 /* SSI GDD (DMA) */ 122 dir = debugfs_create_dir("gdd", omap_ssi->dir); 123 debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); 124 125 return 0; 126 } 127 128 static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) 129 { 130 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 131 132 debugfs_remove_recursive(omap_ssi->dir); 133 } 134 #endif /* CONFIG_DEBUG_FS */ 135 136 /* 137 * FIXME: Horrible HACK needed until we remove the useless wakeline test 138 * in the CMT. To be removed !!!! 139 */ 140 void ssi_waketest(struct hsi_client *cl, unsigned int enable) 141 { 142 struct hsi_port *port = hsi_get_port(cl); 143 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 144 struct hsi_controller *ssi = to_hsi_controller(port->device.parent); 145 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 146 147 omap_port->wktest = !!enable; 148 if (omap_port->wktest) { 149 pm_runtime_get_sync(ssi->device.parent); 150 writel_relaxed(SSI_WAKE(0), 151 omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); 152 } else { 153 writel_relaxed(SSI_WAKE(0), 154 omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); 155 pm_runtime_put(ssi->device.parent); 156 } 157 } 158 EXPORT_SYMBOL_GPL(ssi_waketest); 159 160 static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) 161 { 162 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 163 struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; 164 struct hsi_port *port = to_hsi_port(msg->cl->device.parent); 165 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 166 unsigned int dir; 167 u32 csr; 168 u32 val; 169 170 spin_lock(&omap_ssi->lock); 171 172 val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 173 val &= ~SSI_GDD_LCH(lch); 174 writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 175 176 if (msg->ttype == HSI_MSG_READ) { 177 dir = DMA_FROM_DEVICE; 178 val = SSI_DATAAVAILABLE(msg->channel); 179 pm_runtime_put(omap_port->pdev); 180 } else { 181 dir = DMA_TO_DEVICE; 182 val = SSI_DATAACCEPT(msg->channel); 183 /* Keep clocks reference for write pio event */ 184 } 185 dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); 186 csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); 187 omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ 188 dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", 189 msg->channel, msg->ttype); 190 spin_unlock(&omap_ssi->lock); 191 if (csr & SSI_CSR_TOUR) { /* Timeout error */ 192 msg->status = HSI_STATUS_ERROR; 193 msg->actual_len = 0; 194 spin_lock(&omap_port->lock); 195 list_del(&msg->link); /* Dequeue msg */ 196 spin_unlock(&omap_port->lock); 197 198 list_add_tail(&msg->link, &omap_port->errqueue); 199 schedule_delayed_work(&omap_port->errqueue_work, 0); 200 return; 201 } 202 spin_lock(&omap_port->lock); 203 val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 204 writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 205 spin_unlock(&omap_port->lock); 206 207 msg->status = HSI_STATUS_COMPLETED; 208 msg->actual_len = sg_dma_len(msg->sgt.sgl); 209 } 210 211 static void ssi_gdd_tasklet(unsigned long dev) 212 { 213 struct hsi_controller *ssi = (struct hsi_controller *)dev; 214 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 215 void __iomem *sys = omap_ssi->sys; 216 unsigned int lch; 217 u32 status_reg; 218 219 pm_runtime_get(ssi->device.parent); 220 221 if (!pm_runtime_active(ssi->device.parent)) { 222 dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n"); 223 pm_runtime_put(ssi->device.parent); 224 return; 225 } 226 227 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 228 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 229 if (status_reg & SSI_GDD_LCH(lch)) 230 ssi_gdd_complete(ssi, lch); 231 } 232 writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); 233 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 234 235 pm_runtime_put(ssi->device.parent); 236 237 if (status_reg) 238 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 239 else 240 enable_irq(omap_ssi->gdd_irq); 241 242 } 243 244 static irqreturn_t ssi_gdd_isr(int irq, void *ssi) 245 { 246 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 247 248 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 249 disable_irq_nosync(irq); 250 251 return IRQ_HANDLED; 252 } 253 254 static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) 255 { 256 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 257 unsigned long rate = clk_get_rate(omap_ssi->fck); 258 return rate; 259 } 260 261 static int ssi_clk_event(struct notifier_block *nb, unsigned long event, 262 void *data) 263 { 264 struct omap_ssi_controller *omap_ssi = container_of(nb, 265 struct omap_ssi_controller, fck_nb); 266 struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev); 267 struct clk_notifier_data *clk_data = data; 268 struct omap_ssi_port *omap_port; 269 int i; 270 271 switch (event) { 272 case PRE_RATE_CHANGE: 273 dev_dbg(&ssi->device, "pre rate change\n"); 274 275 for (i = 0; i < ssi->num_ports; i++) { 276 omap_port = omap_ssi->port[i]; 277 278 if (!omap_port) 279 continue; 280 281 /* Workaround for SWBREAK + CAwake down race in CMT */ 282 disable_irq(omap_port->wake_irq); 283 284 /* stop all ssi communication */ 285 pinctrl_pm_select_idle_state(omap_port->pdev); 286 udelay(1); /* wait for racing frames */ 287 } 288 289 break; 290 case ABORT_RATE_CHANGE: 291 dev_dbg(&ssi->device, "abort rate change\n"); 292 fallthrough; 293 case POST_RATE_CHANGE: 294 dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n", 295 clk_data->old_rate, clk_data->new_rate); 296 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* kHz */ 297 298 for (i = 0; i < ssi->num_ports; i++) { 299 omap_port = omap_ssi->port[i]; 300 301 if (!omap_port) 302 continue; 303 304 omap_ssi_port_update_fclk(ssi, omap_port); 305 306 /* resume ssi communication */ 307 pinctrl_pm_select_default_state(omap_port->pdev); 308 enable_irq(omap_port->wake_irq); 309 } 310 311 break; 312 default: 313 break; 314 } 315 316 return NOTIFY_DONE; 317 } 318 319 static int ssi_get_iomem(struct platform_device *pd, 320 const char *name, void __iomem **pbase, dma_addr_t *phy) 321 { 322 struct resource *mem; 323 void __iomem *base; 324 struct hsi_controller *ssi = platform_get_drvdata(pd); 325 326 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); 327 base = devm_ioremap_resource(&ssi->device, mem); 328 if (IS_ERR(base)) 329 return PTR_ERR(base); 330 331 *pbase = base; 332 333 if (phy) 334 *phy = mem->start; 335 336 return 0; 337 } 338 339 static int ssi_add_controller(struct hsi_controller *ssi, 340 struct platform_device *pd) 341 { 342 struct omap_ssi_controller *omap_ssi; 343 int err; 344 345 omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); 346 if (!omap_ssi) 347 return -ENOMEM; 348 349 err = ida_alloc(&platform_omap_ssi_ida, GFP_KERNEL); 350 if (err < 0) 351 return err; 352 ssi->id = err; 353 354 ssi->owner = THIS_MODULE; 355 ssi->device.parent = &pd->dev; 356 dev_set_name(&ssi->device, "ssi%d", ssi->id); 357 hsi_controller_set_drvdata(ssi, omap_ssi); 358 omap_ssi->dev = &ssi->device; 359 err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); 360 if (err < 0) 361 goto out_err; 362 err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); 363 if (err < 0) 364 goto out_err; 365 err = platform_get_irq_byname(pd, "gdd_mpu"); 366 if (err < 0) 367 goto out_err; 368 omap_ssi->gdd_irq = err; 369 tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, 370 (unsigned long)ssi); 371 err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, 372 0, "gdd_mpu", ssi); 373 if (err < 0) 374 goto out_err; 375 376 omap_ssi->port = devm_kcalloc(&ssi->device, ssi->num_ports, 377 sizeof(*omap_ssi->port), GFP_KERNEL); 378 if (!omap_ssi->port) { 379 err = -ENOMEM; 380 goto out_err; 381 } 382 383 omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); 384 if (IS_ERR(omap_ssi->fck)) { 385 dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", 386 PTR_ERR(omap_ssi->fck)); 387 err = -ENODEV; 388 goto out_err; 389 } 390 391 omap_ssi->fck_nb.notifier_call = ssi_clk_event; 392 omap_ssi->fck_nb.priority = INT_MAX; 393 clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb); 394 395 /* TODO: find register, which can be used to detect context loss */ 396 omap_ssi->get_loss = NULL; 397 398 omap_ssi->max_speed = UINT_MAX; 399 spin_lock_init(&omap_ssi->lock); 400 err = hsi_register_controller(ssi); 401 402 if (err < 0) 403 goto out_err; 404 405 return 0; 406 407 out_err: 408 ida_free(&platform_omap_ssi_ida, ssi->id); 409 return err; 410 } 411 412 static int ssi_hw_init(struct hsi_controller *ssi) 413 { 414 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 415 int err; 416 417 err = pm_runtime_resume_and_get(ssi->device.parent); 418 if (err < 0) { 419 dev_err(&ssi->device, "runtime PM failed %d\n", err); 420 return err; 421 } 422 /* Resetting GDD */ 423 writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); 424 /* Get FCK rate in kHz */ 425 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); 426 dev_dbg(&ssi->device, "SSI fck rate %lu kHz\n", omap_ssi->fck_rate); 427 428 writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); 429 omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; 430 pm_runtime_put_sync(ssi->device.parent); 431 432 return 0; 433 } 434 435 static void ssi_remove_controller(struct hsi_controller *ssi) 436 { 437 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 438 int id = ssi->id; 439 tasklet_kill(&omap_ssi->gdd_tasklet); 440 hsi_unregister_controller(ssi); 441 clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb); 442 ida_free(&platform_omap_ssi_ida, id); 443 } 444 445 static inline int ssi_of_get_available_ports_count(const struct device_node *np) 446 { 447 struct device_node *child; 448 int num = 0; 449 450 for_each_available_child_of_node(np, child) 451 if (of_device_is_compatible(child, "ti,omap3-ssi-port")) 452 num++; 453 454 return num; 455 } 456 457 static int ssi_remove_ports(struct device *dev, void *c) 458 { 459 struct platform_device *pdev = to_platform_device(dev); 460 461 if (!dev->of_node) 462 return 0; 463 464 of_node_clear_flag(dev->of_node, OF_POPULATED); 465 of_device_unregister(pdev); 466 467 return 0; 468 } 469 470 static int ssi_probe(struct platform_device *pd) 471 { 472 struct platform_device *childpdev; 473 struct device_node *np = pd->dev.of_node; 474 struct device_node *child; 475 struct hsi_controller *ssi; 476 int err; 477 int num_ports; 478 479 if (!np) { 480 dev_err(&pd->dev, "missing device tree data\n"); 481 return -EINVAL; 482 } 483 484 num_ports = ssi_of_get_available_ports_count(np); 485 486 ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); 487 if (!ssi) { 488 dev_err(&pd->dev, "No memory for controller\n"); 489 return -ENOMEM; 490 } 491 492 platform_set_drvdata(pd, ssi); 493 494 err = ssi_add_controller(ssi, pd); 495 if (err < 0) { 496 hsi_put_controller(ssi); 497 goto out1; 498 } 499 500 pm_runtime_enable(&pd->dev); 501 502 ssi->device.dma_mask = &ssi->device.coherent_dma_mask; 503 504 err = dma_set_mask_and_coherent(&ssi->device, DMA_BIT_MASK(32)); 505 if (err) 506 goto out2; 507 508 err = ssi_hw_init(ssi); 509 if (err < 0) 510 goto out2; 511 #ifdef CONFIG_DEBUG_FS 512 err = ssi_debug_add_ctrl(ssi); 513 if (err < 0) 514 goto out2; 515 #endif 516 517 for_each_available_child_of_node(np, child) { 518 if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) 519 continue; 520 521 childpdev = of_platform_device_create(child, NULL, &pd->dev); 522 if (!childpdev) { 523 err = -ENODEV; 524 dev_err(&pd->dev, "failed to create ssi controller port\n"); 525 of_node_put(child); 526 goto out3; 527 } 528 } 529 530 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", 531 ssi->id, num_ports); 532 return err; 533 out3: 534 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 535 #ifdef CONFIG_DEBUG_FS 536 ssi_debug_remove_ctrl(ssi); 537 #endif 538 out2: 539 ssi_remove_controller(ssi); 540 pm_runtime_disable(&pd->dev); 541 out1: 542 platform_set_drvdata(pd, NULL); 543 544 return err; 545 } 546 547 static void 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 } 562 563 #ifdef CONFIG_PM 564 static int omap_ssi_runtime_suspend(struct device *dev) 565 { 566 struct hsi_controller *ssi = dev_get_drvdata(dev); 567 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 568 569 dev_dbg(dev, "runtime suspend!\n"); 570 571 if (omap_ssi->get_loss) 572 omap_ssi->loss_count = 573 omap_ssi->get_loss(ssi->device.parent); 574 575 return 0; 576 } 577 578 static int omap_ssi_runtime_resume(struct device *dev) 579 { 580 struct hsi_controller *ssi = dev_get_drvdata(dev); 581 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 582 583 dev_dbg(dev, "runtime resume!\n"); 584 585 if ((omap_ssi->get_loss) && (omap_ssi->loss_count == 586 omap_ssi->get_loss(ssi->device.parent))) 587 return 0; 588 589 writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); 590 591 return 0; 592 } 593 594 static const struct dev_pm_ops omap_ssi_pm_ops = { 595 SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, 596 NULL) 597 }; 598 599 #define DEV_PM_OPS (&omap_ssi_pm_ops) 600 #else 601 #define DEV_PM_OPS NULL 602 #endif 603 604 #ifdef CONFIG_OF 605 static const struct of_device_id omap_ssi_of_match[] = { 606 { .compatible = "ti,omap3-ssi", }, 607 {}, 608 }; 609 MODULE_DEVICE_TABLE(of, omap_ssi_of_match); 610 #else 611 #define omap_ssi_of_match NULL 612 #endif 613 614 static struct platform_driver ssi_pdriver = { 615 .probe = ssi_probe, 616 .remove = ssi_remove, 617 .driver = { 618 .name = "omap_ssi", 619 .pm = DEV_PM_OPS, 620 .of_match_table = omap_ssi_of_match, 621 }, 622 }; 623 624 static int __init ssi_init(void) { 625 int ret; 626 627 ret = platform_driver_register(&ssi_pdriver); 628 if (ret) 629 return ret; 630 631 ret = platform_driver_register(&ssi_port_pdriver); 632 if (ret) { 633 platform_driver_unregister(&ssi_pdriver); 634 return ret; 635 } 636 637 return 0; 638 } 639 module_init(ssi_init); 640 641 static void __exit ssi_exit(void) { 642 platform_driver_unregister(&ssi_port_pdriver); 643 platform_driver_unregister(&ssi_pdriver); 644 } 645 module_exit(ssi_exit); 646 647 MODULE_ALIAS("platform:omap_ssi"); 648 MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); 649 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); 650 MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); 651 MODULE_LICENSE("GPL v2"); 652