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_platform.h> 29 #include <linux/hsi/hsi.h> 30 #include <linux/idr.h> 31 32 #include "omap_ssi_regs.h" 33 #include "omap_ssi.h" 34 35 /* For automatically allocated device IDs */ 36 static DEFINE_IDA(platform_omap_ssi_ida); 37 38 #ifdef CONFIG_DEBUG_FS 39 static int ssi_regs_show(struct seq_file *m, void *p __maybe_unused) 40 { 41 struct hsi_controller *ssi = m->private; 42 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 43 void __iomem *sys = omap_ssi->sys; 44 45 pm_runtime_get_sync(ssi->device.parent); 46 seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG)); 47 seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG)); 48 seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG)); 49 pm_runtime_put(ssi->device.parent); 50 51 return 0; 52 } 53 54 static int ssi_gdd_regs_show(struct seq_file *m, void *p __maybe_unused) 55 { 56 struct hsi_controller *ssi = m->private; 57 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 58 void __iomem *gdd = omap_ssi->gdd; 59 void __iomem *sys = omap_ssi->sys; 60 int lch; 61 62 pm_runtime_get_sync(ssi->device.parent); 63 64 seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n", 65 readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG)); 66 seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n", 67 readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); 68 seq_printf(m, "HW_ID\t\t: 0x%08x\n", 69 readl(gdd + SSI_GDD_HW_ID_REG)); 70 seq_printf(m, "PPORT_ID\t: 0x%08x\n", 71 readl(gdd + SSI_GDD_PPORT_ID_REG)); 72 seq_printf(m, "MPORT_ID\t: 0x%08x\n", 73 readl(gdd + SSI_GDD_MPORT_ID_REG)); 74 seq_printf(m, "TEST\t\t: 0x%08x\n", 75 readl(gdd + SSI_GDD_TEST_REG)); 76 seq_printf(m, "GCR\t\t: 0x%08x\n", 77 readl(gdd + SSI_GDD_GCR_REG)); 78 79 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 80 seq_printf(m, "\nGDD LCH %d\n=========\n", lch); 81 seq_printf(m, "CSDP\t\t: 0x%04x\n", 82 readw(gdd + SSI_GDD_CSDP_REG(lch))); 83 seq_printf(m, "CCR\t\t: 0x%04x\n", 84 readw(gdd + SSI_GDD_CCR_REG(lch))); 85 seq_printf(m, "CICR\t\t: 0x%04x\n", 86 readw(gdd + SSI_GDD_CICR_REG(lch))); 87 seq_printf(m, "CSR\t\t: 0x%04x\n", 88 readw(gdd + SSI_GDD_CSR_REG(lch))); 89 seq_printf(m, "CSSA\t\t: 0x%08x\n", 90 readl(gdd + SSI_GDD_CSSA_REG(lch))); 91 seq_printf(m, "CDSA\t\t: 0x%08x\n", 92 readl(gdd + SSI_GDD_CDSA_REG(lch))); 93 seq_printf(m, "CEN\t\t: 0x%04x\n", 94 readw(gdd + SSI_GDD_CEN_REG(lch))); 95 seq_printf(m, "CSAC\t\t: 0x%04x\n", 96 readw(gdd + SSI_GDD_CSAC_REG(lch))); 97 seq_printf(m, "CDAC\t\t: 0x%04x\n", 98 readw(gdd + SSI_GDD_CDAC_REG(lch))); 99 seq_printf(m, "CLNK_CTRL\t: 0x%04x\n", 100 readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch))); 101 } 102 103 pm_runtime_put(ssi->device.parent); 104 105 return 0; 106 } 107 108 DEFINE_SHOW_ATTRIBUTE(ssi_regs); 109 DEFINE_SHOW_ATTRIBUTE(ssi_gdd_regs); 110 111 static int ssi_debug_add_ctrl(struct hsi_controller *ssi) 112 { 113 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 114 struct dentry *dir; 115 116 /* SSI controller */ 117 omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL); 118 if (!omap_ssi->dir) 119 return -ENOMEM; 120 121 debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, 122 &ssi_regs_fops); 123 /* SSI GDD (DMA) */ 124 dir = debugfs_create_dir("gdd", omap_ssi->dir); 125 if (!dir) 126 goto rback; 127 debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); 128 129 return 0; 130 rback: 131 debugfs_remove_recursive(omap_ssi->dir); 132 133 return -ENOMEM; 134 } 135 136 static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) 137 { 138 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 139 140 debugfs_remove_recursive(omap_ssi->dir); 141 } 142 #endif /* CONFIG_DEBUG_FS */ 143 144 /* 145 * FIXME: Horrible HACK needed until we remove the useless wakeline test 146 * in the CMT. To be removed !!!! 147 */ 148 void ssi_waketest(struct hsi_client *cl, unsigned int enable) 149 { 150 struct hsi_port *port = hsi_get_port(cl); 151 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 152 struct hsi_controller *ssi = to_hsi_controller(port->device.parent); 153 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 154 155 omap_port->wktest = !!enable; 156 if (omap_port->wktest) { 157 pm_runtime_get_sync(ssi->device.parent); 158 writel_relaxed(SSI_WAKE(0), 159 omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); 160 } else { 161 writel_relaxed(SSI_WAKE(0), 162 omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); 163 pm_runtime_put(ssi->device.parent); 164 } 165 } 166 EXPORT_SYMBOL_GPL(ssi_waketest); 167 168 static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) 169 { 170 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 171 struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; 172 struct hsi_port *port = to_hsi_port(msg->cl->device.parent); 173 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 174 unsigned int dir; 175 u32 csr; 176 u32 val; 177 178 spin_lock(&omap_ssi->lock); 179 180 val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 181 val &= ~SSI_GDD_LCH(lch); 182 writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 183 184 if (msg->ttype == HSI_MSG_READ) { 185 dir = DMA_FROM_DEVICE; 186 val = SSI_DATAAVAILABLE(msg->channel); 187 pm_runtime_put(omap_port->pdev); 188 } else { 189 dir = DMA_TO_DEVICE; 190 val = SSI_DATAACCEPT(msg->channel); 191 /* Keep clocks reference for write pio event */ 192 } 193 dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); 194 csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); 195 omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ 196 dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", 197 msg->channel, msg->ttype); 198 spin_unlock(&omap_ssi->lock); 199 if (csr & SSI_CSR_TOUR) { /* Timeout error */ 200 msg->status = HSI_STATUS_ERROR; 201 msg->actual_len = 0; 202 spin_lock(&omap_port->lock); 203 list_del(&msg->link); /* Dequeue msg */ 204 spin_unlock(&omap_port->lock); 205 206 list_add_tail(&msg->link, &omap_port->errqueue); 207 schedule_delayed_work(&omap_port->errqueue_work, 0); 208 return; 209 } 210 spin_lock(&omap_port->lock); 211 val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 212 writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 213 spin_unlock(&omap_port->lock); 214 215 msg->status = HSI_STATUS_COMPLETED; 216 msg->actual_len = sg_dma_len(msg->sgt.sgl); 217 } 218 219 static void ssi_gdd_tasklet(unsigned long dev) 220 { 221 struct hsi_controller *ssi = (struct hsi_controller *)dev; 222 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 223 void __iomem *sys = omap_ssi->sys; 224 unsigned int lch; 225 u32 status_reg; 226 227 pm_runtime_get(ssi->device.parent); 228 229 if (!pm_runtime_active(ssi->device.parent)) { 230 dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n"); 231 pm_runtime_put(ssi->device.parent); 232 return; 233 } 234 235 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 236 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 237 if (status_reg & SSI_GDD_LCH(lch)) 238 ssi_gdd_complete(ssi, lch); 239 } 240 writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); 241 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 242 243 pm_runtime_put(ssi->device.parent); 244 245 if (status_reg) 246 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 247 else 248 enable_irq(omap_ssi->gdd_irq); 249 250 } 251 252 static irqreturn_t ssi_gdd_isr(int irq, void *ssi) 253 { 254 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 255 256 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 257 disable_irq_nosync(irq); 258 259 return IRQ_HANDLED; 260 } 261 262 static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) 263 { 264 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 265 unsigned long rate = clk_get_rate(omap_ssi->fck); 266 return rate; 267 } 268 269 static int ssi_clk_event(struct notifier_block *nb, unsigned long event, 270 void *data) 271 { 272 struct omap_ssi_controller *omap_ssi = container_of(nb, 273 struct omap_ssi_controller, fck_nb); 274 struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev); 275 struct clk_notifier_data *clk_data = data; 276 struct omap_ssi_port *omap_port; 277 int i; 278 279 switch (event) { 280 case PRE_RATE_CHANGE: 281 dev_dbg(&ssi->device, "pre rate change\n"); 282 283 for (i = 0; i < ssi->num_ports; i++) { 284 omap_port = omap_ssi->port[i]; 285 286 if (!omap_port) 287 continue; 288 289 /* Workaround for SWBREAK + CAwake down race in CMT */ 290 disable_irq(omap_port->wake_irq); 291 292 /* stop all ssi communication */ 293 pinctrl_pm_select_idle_state(omap_port->pdev); 294 udelay(1); /* wait for racing frames */ 295 } 296 297 break; 298 case ABORT_RATE_CHANGE: 299 dev_dbg(&ssi->device, "abort rate change\n"); 300 fallthrough; 301 case POST_RATE_CHANGE: 302 dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n", 303 clk_data->old_rate, clk_data->new_rate); 304 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* kHz */ 305 306 for (i = 0; i < ssi->num_ports; i++) { 307 omap_port = omap_ssi->port[i]; 308 309 if (!omap_port) 310 continue; 311 312 omap_ssi_port_update_fclk(ssi, omap_port); 313 314 /* resume ssi communication */ 315 pinctrl_pm_select_default_state(omap_port->pdev); 316 enable_irq(omap_port->wake_irq); 317 } 318 319 break; 320 default: 321 break; 322 } 323 324 return NOTIFY_DONE; 325 } 326 327 static int ssi_get_iomem(struct platform_device *pd, 328 const char *name, void __iomem **pbase, dma_addr_t *phy) 329 { 330 struct resource *mem; 331 void __iomem *base; 332 struct hsi_controller *ssi = platform_get_drvdata(pd); 333 334 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); 335 base = devm_ioremap_resource(&ssi->device, mem); 336 if (IS_ERR(base)) 337 return PTR_ERR(base); 338 339 *pbase = base; 340 341 if (phy) 342 *phy = mem->start; 343 344 return 0; 345 } 346 347 static int ssi_add_controller(struct hsi_controller *ssi, 348 struct platform_device *pd) 349 { 350 struct omap_ssi_controller *omap_ssi; 351 int err; 352 353 omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); 354 if (!omap_ssi) 355 return -ENOMEM; 356 357 err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); 358 if (err < 0) 359 return err; 360 ssi->id = err; 361 362 ssi->owner = THIS_MODULE; 363 ssi->device.parent = &pd->dev; 364 dev_set_name(&ssi->device, "ssi%d", ssi->id); 365 hsi_controller_set_drvdata(ssi, omap_ssi); 366 omap_ssi->dev = &ssi->device; 367 err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); 368 if (err < 0) 369 goto out_err; 370 err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); 371 if (err < 0) 372 goto out_err; 373 err = platform_get_irq_byname(pd, "gdd_mpu"); 374 if (err < 0) 375 goto out_err; 376 omap_ssi->gdd_irq = err; 377 tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, 378 (unsigned long)ssi); 379 err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, 380 0, "gdd_mpu", ssi); 381 if (err < 0) { 382 dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", 383 omap_ssi->gdd_irq, err); 384 goto out_err; 385 } 386 387 omap_ssi->port = devm_kcalloc(&ssi->device, ssi->num_ports, 388 sizeof(*omap_ssi->port), GFP_KERNEL); 389 if (!omap_ssi->port) { 390 err = -ENOMEM; 391 goto out_err; 392 } 393 394 omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); 395 if (IS_ERR(omap_ssi->fck)) { 396 dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", 397 PTR_ERR(omap_ssi->fck)); 398 err = -ENODEV; 399 goto out_err; 400 } 401 402 omap_ssi->fck_nb.notifier_call = ssi_clk_event; 403 omap_ssi->fck_nb.priority = INT_MAX; 404 clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb); 405 406 /* TODO: find register, which can be used to detect context loss */ 407 omap_ssi->get_loss = NULL; 408 409 omap_ssi->max_speed = UINT_MAX; 410 spin_lock_init(&omap_ssi->lock); 411 err = hsi_register_controller(ssi); 412 413 if (err < 0) 414 goto out_err; 415 416 return 0; 417 418 out_err: 419 ida_simple_remove(&platform_omap_ssi_ida, ssi->id); 420 return err; 421 } 422 423 static int ssi_hw_init(struct hsi_controller *ssi) 424 { 425 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 426 int err; 427 428 err = pm_runtime_resume_and_get(ssi->device.parent); 429 if (err < 0) { 430 dev_err(&ssi->device, "runtime PM failed %d\n", err); 431 return err; 432 } 433 /* Resetting GDD */ 434 writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); 435 /* Get FCK rate in kHz */ 436 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); 437 dev_dbg(&ssi->device, "SSI fck rate %lu kHz\n", omap_ssi->fck_rate); 438 439 writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); 440 omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; 441 pm_runtime_put_sync(ssi->device.parent); 442 443 return 0; 444 } 445 446 static void ssi_remove_controller(struct hsi_controller *ssi) 447 { 448 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 449 int id = ssi->id; 450 tasklet_kill(&omap_ssi->gdd_tasklet); 451 hsi_unregister_controller(ssi); 452 clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb); 453 ida_simple_remove(&platform_omap_ssi_ida, id); 454 } 455 456 static inline int ssi_of_get_available_ports_count(const struct device_node *np) 457 { 458 struct device_node *child; 459 int num = 0; 460 461 for_each_available_child_of_node(np, child) 462 if (of_device_is_compatible(child, "ti,omap3-ssi-port")) 463 num++; 464 465 return num; 466 } 467 468 static int ssi_remove_ports(struct device *dev, void *c) 469 { 470 struct platform_device *pdev = to_platform_device(dev); 471 472 if (!dev->of_node) 473 return 0; 474 475 of_node_clear_flag(dev->of_node, OF_POPULATED); 476 of_device_unregister(pdev); 477 478 return 0; 479 } 480 481 static int ssi_probe(struct platform_device *pd) 482 { 483 struct platform_device *childpdev; 484 struct device_node *np = pd->dev.of_node; 485 struct device_node *child; 486 struct hsi_controller *ssi; 487 int err; 488 int num_ports; 489 490 if (!np) { 491 dev_err(&pd->dev, "missing device tree data\n"); 492 return -EINVAL; 493 } 494 495 num_ports = ssi_of_get_available_ports_count(np); 496 497 ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); 498 if (!ssi) { 499 dev_err(&pd->dev, "No memory for controller\n"); 500 return -ENOMEM; 501 } 502 503 platform_set_drvdata(pd, ssi); 504 505 err = ssi_add_controller(ssi, pd); 506 if (err < 0) { 507 hsi_put_controller(ssi); 508 goto out1; 509 } 510 511 pm_runtime_enable(&pd->dev); 512 513 err = ssi_hw_init(ssi); 514 if (err < 0) 515 goto out2; 516 #ifdef CONFIG_DEBUG_FS 517 err = ssi_debug_add_ctrl(ssi); 518 if (err < 0) 519 goto out2; 520 #endif 521 522 for_each_available_child_of_node(np, child) { 523 if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) 524 continue; 525 526 childpdev = of_platform_device_create(child, NULL, &pd->dev); 527 if (!childpdev) { 528 err = -ENODEV; 529 dev_err(&pd->dev, "failed to create ssi controller port\n"); 530 of_node_put(child); 531 goto out3; 532 } 533 } 534 535 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", 536 ssi->id, num_ports); 537 return err; 538 out3: 539 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 540 out2: 541 ssi_remove_controller(ssi); 542 pm_runtime_disable(&pd->dev); 543 out1: 544 platform_set_drvdata(pd, NULL); 545 546 return err; 547 } 548 549 static int ssi_remove(struct platform_device *pd) 550 { 551 struct hsi_controller *ssi = platform_get_drvdata(pd); 552 553 /* cleanup of of_platform_populate() call */ 554 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 555 556 #ifdef CONFIG_DEBUG_FS 557 ssi_debug_remove_ctrl(ssi); 558 #endif 559 ssi_remove_controller(ssi); 560 platform_set_drvdata(pd, NULL); 561 562 pm_runtime_disable(&pd->dev); 563 564 return 0; 565 } 566 567 #ifdef CONFIG_PM 568 static int omap_ssi_runtime_suspend(struct device *dev) 569 { 570 struct hsi_controller *ssi = dev_get_drvdata(dev); 571 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 572 573 dev_dbg(dev, "runtime suspend!\n"); 574 575 if (omap_ssi->get_loss) 576 omap_ssi->loss_count = 577 omap_ssi->get_loss(ssi->device.parent); 578 579 return 0; 580 } 581 582 static int omap_ssi_runtime_resume(struct device *dev) 583 { 584 struct hsi_controller *ssi = dev_get_drvdata(dev); 585 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 586 587 dev_dbg(dev, "runtime resume!\n"); 588 589 if ((omap_ssi->get_loss) && (omap_ssi->loss_count == 590 omap_ssi->get_loss(ssi->device.parent))) 591 return 0; 592 593 writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); 594 595 return 0; 596 } 597 598 static const struct dev_pm_ops omap_ssi_pm_ops = { 599 SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, 600 NULL) 601 }; 602 603 #define DEV_PM_OPS (&omap_ssi_pm_ops) 604 #else 605 #define DEV_PM_OPS NULL 606 #endif 607 608 #ifdef CONFIG_OF 609 static const struct of_device_id omap_ssi_of_match[] = { 610 { .compatible = "ti,omap3-ssi", }, 611 {}, 612 }; 613 MODULE_DEVICE_TABLE(of, omap_ssi_of_match); 614 #else 615 #define omap_ssi_of_match NULL 616 #endif 617 618 static struct platform_driver ssi_pdriver = { 619 .probe = ssi_probe, 620 .remove = ssi_remove, 621 .driver = { 622 .name = "omap_ssi", 623 .pm = DEV_PM_OPS, 624 .of_match_table = omap_ssi_of_match, 625 }, 626 }; 627 628 static int __init ssi_init(void) { 629 int ret; 630 631 ret = platform_driver_register(&ssi_pdriver); 632 if (ret) 633 return ret; 634 635 ret = platform_driver_register(&ssi_port_pdriver); 636 if (ret) { 637 platform_driver_unregister(&ssi_pdriver); 638 return ret; 639 } 640 641 return 0; 642 } 643 module_init(ssi_init); 644 645 static void __exit ssi_exit(void) { 646 platform_driver_unregister(&ssi_port_pdriver); 647 platform_driver_unregister(&ssi_pdriver); 648 } 649 module_exit(ssi_exit); 650 651 MODULE_ALIAS("platform:omap_ssi"); 652 MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); 653 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); 654 MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); 655 MODULE_LICENSE("GPL v2"); 656