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 fallthrough; 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 return 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 goto out_err; 375 omap_ssi->gdd_irq = err; 376 tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, 377 (unsigned long)ssi); 378 err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, 379 0, "gdd_mpu", ssi); 380 if (err < 0) { 381 dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", 382 omap_ssi->gdd_irq, err); 383 goto out_err; 384 } 385 386 omap_ssi->port = devm_kcalloc(&ssi->device, ssi->num_ports, 387 sizeof(*omap_ssi->port), GFP_KERNEL); 388 if (!omap_ssi->port) { 389 err = -ENOMEM; 390 goto out_err; 391 } 392 393 omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); 394 if (IS_ERR(omap_ssi->fck)) { 395 dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", 396 PTR_ERR(omap_ssi->fck)); 397 err = -ENODEV; 398 goto out_err; 399 } 400 401 omap_ssi->fck_nb.notifier_call = ssi_clk_event; 402 omap_ssi->fck_nb.priority = INT_MAX; 403 clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb); 404 405 /* TODO: find register, which can be used to detect context loss */ 406 omap_ssi->get_loss = NULL; 407 408 omap_ssi->max_speed = UINT_MAX; 409 spin_lock_init(&omap_ssi->lock); 410 err = hsi_register_controller(ssi); 411 412 if (err < 0) 413 goto out_err; 414 415 return 0; 416 417 out_err: 418 ida_simple_remove(&platform_omap_ssi_ida, ssi->id); 419 return err; 420 } 421 422 static int ssi_hw_init(struct hsi_controller *ssi) 423 { 424 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 425 int err; 426 427 err = pm_runtime_resume_and_get(ssi->device.parent); 428 if (err < 0) { 429 dev_err(&ssi->device, "runtime PM failed %d\n", err); 430 return err; 431 } 432 /* Resetting GDD */ 433 writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); 434 /* Get FCK rate in kHz */ 435 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); 436 dev_dbg(&ssi->device, "SSI fck rate %lu kHz\n", omap_ssi->fck_rate); 437 438 writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); 439 omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; 440 pm_runtime_put_sync(ssi->device.parent); 441 442 return 0; 443 } 444 445 static void ssi_remove_controller(struct hsi_controller *ssi) 446 { 447 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 448 int id = ssi->id; 449 tasklet_kill(&omap_ssi->gdd_tasklet); 450 hsi_unregister_controller(ssi); 451 clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb); 452 ida_simple_remove(&platform_omap_ssi_ida, id); 453 } 454 455 static inline int ssi_of_get_available_ports_count(const struct device_node *np) 456 { 457 struct device_node *child; 458 int num = 0; 459 460 for_each_available_child_of_node(np, child) 461 if (of_device_is_compatible(child, "ti,omap3-ssi-port")) 462 num++; 463 464 return num; 465 } 466 467 static int ssi_remove_ports(struct device *dev, void *c) 468 { 469 struct platform_device *pdev = to_platform_device(dev); 470 471 if (!dev->of_node) 472 return 0; 473 474 of_node_clear_flag(dev->of_node, OF_POPULATED); 475 of_device_unregister(pdev); 476 477 return 0; 478 } 479 480 static int ssi_probe(struct platform_device *pd) 481 { 482 struct platform_device *childpdev; 483 struct device_node *np = pd->dev.of_node; 484 struct device_node *child; 485 struct hsi_controller *ssi; 486 int err; 487 int num_ports; 488 489 if (!np) { 490 dev_err(&pd->dev, "missing device tree data\n"); 491 return -EINVAL; 492 } 493 494 num_ports = ssi_of_get_available_ports_count(np); 495 496 ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); 497 if (!ssi) { 498 dev_err(&pd->dev, "No memory for controller\n"); 499 return -ENOMEM; 500 } 501 502 platform_set_drvdata(pd, ssi); 503 504 err = ssi_add_controller(ssi, pd); 505 if (err < 0) 506 goto out1; 507 508 pm_runtime_enable(&pd->dev); 509 510 err = ssi_hw_init(ssi); 511 if (err < 0) 512 goto out2; 513 #ifdef CONFIG_DEBUG_FS 514 err = ssi_debug_add_ctrl(ssi); 515 if (err < 0) 516 goto out2; 517 #endif 518 519 for_each_available_child_of_node(np, child) { 520 if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) 521 continue; 522 523 childpdev = of_platform_device_create(child, NULL, &pd->dev); 524 if (!childpdev) { 525 err = -ENODEV; 526 dev_err(&pd->dev, "failed to create ssi controller port\n"); 527 goto out3; 528 } 529 } 530 531 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", 532 ssi->id, num_ports); 533 return err; 534 out3: 535 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 536 out2: 537 ssi_remove_controller(ssi); 538 out1: 539 platform_set_drvdata(pd, NULL); 540 pm_runtime_disable(&pd->dev); 541 542 return err; 543 } 544 545 static int ssi_remove(struct platform_device *pd) 546 { 547 struct hsi_controller *ssi = platform_get_drvdata(pd); 548 549 /* cleanup of of_platform_populate() call */ 550 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 551 552 #ifdef CONFIG_DEBUG_FS 553 ssi_debug_remove_ctrl(ssi); 554 #endif 555 ssi_remove_controller(ssi); 556 platform_set_drvdata(pd, NULL); 557 558 pm_runtime_disable(&pd->dev); 559 560 return 0; 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 return platform_driver_register(&ssi_port_pdriver); 632 } 633 module_init(ssi_init); 634 635 static void __exit ssi_exit(void) { 636 platform_driver_unregister(&ssi_port_pdriver); 637 platform_driver_unregister(&ssi_pdriver); 638 } 639 module_exit(ssi_exit); 640 641 MODULE_ALIAS("platform:omap_ssi"); 642 MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); 643 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); 644 MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); 645 MODULE_LICENSE("GPL v2"); 646