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 if (!omap_ssi->dir) 120 return -ENOMEM; 121 122 debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, 123 &ssi_regs_fops); 124 /* SSI GDD (DMA) */ 125 dir = debugfs_create_dir("gdd", omap_ssi->dir); 126 if (!dir) 127 goto rback; 128 debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); 129 130 return 0; 131 rback: 132 debugfs_remove_recursive(omap_ssi->dir); 133 134 return -ENOMEM; 135 } 136 137 static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) 138 { 139 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 140 141 debugfs_remove_recursive(omap_ssi->dir); 142 } 143 #endif /* CONFIG_DEBUG_FS */ 144 145 /* 146 * FIXME: Horrible HACK needed until we remove the useless wakeline test 147 * in the CMT. To be removed !!!! 148 */ 149 void ssi_waketest(struct hsi_client *cl, unsigned int enable) 150 { 151 struct hsi_port *port = hsi_get_port(cl); 152 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 153 struct hsi_controller *ssi = to_hsi_controller(port->device.parent); 154 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 155 156 omap_port->wktest = !!enable; 157 if (omap_port->wktest) { 158 pm_runtime_get_sync(ssi->device.parent); 159 writel_relaxed(SSI_WAKE(0), 160 omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); 161 } else { 162 writel_relaxed(SSI_WAKE(0), 163 omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); 164 pm_runtime_put(ssi->device.parent); 165 } 166 } 167 EXPORT_SYMBOL_GPL(ssi_waketest); 168 169 static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) 170 { 171 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 172 struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; 173 struct hsi_port *port = to_hsi_port(msg->cl->device.parent); 174 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 175 unsigned int dir; 176 u32 csr; 177 u32 val; 178 179 spin_lock(&omap_ssi->lock); 180 181 val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 182 val &= ~SSI_GDD_LCH(lch); 183 writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 184 185 if (msg->ttype == HSI_MSG_READ) { 186 dir = DMA_FROM_DEVICE; 187 val = SSI_DATAAVAILABLE(msg->channel); 188 pm_runtime_put(omap_port->pdev); 189 } else { 190 dir = DMA_TO_DEVICE; 191 val = SSI_DATAACCEPT(msg->channel); 192 /* Keep clocks reference for write pio event */ 193 } 194 dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); 195 csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); 196 omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ 197 dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", 198 msg->channel, msg->ttype); 199 spin_unlock(&omap_ssi->lock); 200 if (csr & SSI_CSR_TOUR) { /* Timeout error */ 201 msg->status = HSI_STATUS_ERROR; 202 msg->actual_len = 0; 203 spin_lock(&omap_port->lock); 204 list_del(&msg->link); /* Dequeue msg */ 205 spin_unlock(&omap_port->lock); 206 207 list_add_tail(&msg->link, &omap_port->errqueue); 208 schedule_delayed_work(&omap_port->errqueue_work, 0); 209 return; 210 } 211 spin_lock(&omap_port->lock); 212 val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 213 writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 214 spin_unlock(&omap_port->lock); 215 216 msg->status = HSI_STATUS_COMPLETED; 217 msg->actual_len = sg_dma_len(msg->sgt.sgl); 218 } 219 220 static void ssi_gdd_tasklet(unsigned long dev) 221 { 222 struct hsi_controller *ssi = (struct hsi_controller *)dev; 223 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 224 void __iomem *sys = omap_ssi->sys; 225 unsigned int lch; 226 u32 status_reg; 227 228 pm_runtime_get(ssi->device.parent); 229 230 if (!pm_runtime_active(ssi->device.parent)) { 231 dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n"); 232 pm_runtime_put(ssi->device.parent); 233 return; 234 } 235 236 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 237 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 238 if (status_reg & SSI_GDD_LCH(lch)) 239 ssi_gdd_complete(ssi, lch); 240 } 241 writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); 242 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 243 244 pm_runtime_put(ssi->device.parent); 245 246 if (status_reg) 247 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 248 else 249 enable_irq(omap_ssi->gdd_irq); 250 251 } 252 253 static irqreturn_t ssi_gdd_isr(int irq, void *ssi) 254 { 255 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 256 257 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 258 disable_irq_nosync(irq); 259 260 return IRQ_HANDLED; 261 } 262 263 static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) 264 { 265 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 266 unsigned long rate = clk_get_rate(omap_ssi->fck); 267 return rate; 268 } 269 270 static int ssi_clk_event(struct notifier_block *nb, unsigned long event, 271 void *data) 272 { 273 struct omap_ssi_controller *omap_ssi = container_of(nb, 274 struct omap_ssi_controller, fck_nb); 275 struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev); 276 struct clk_notifier_data *clk_data = data; 277 struct omap_ssi_port *omap_port; 278 int i; 279 280 switch (event) { 281 case PRE_RATE_CHANGE: 282 dev_dbg(&ssi->device, "pre rate change\n"); 283 284 for (i = 0; i < ssi->num_ports; i++) { 285 omap_port = omap_ssi->port[i]; 286 287 if (!omap_port) 288 continue; 289 290 /* Workaround for SWBREAK + CAwake down race in CMT */ 291 disable_irq(omap_port->wake_irq); 292 293 /* stop all ssi communication */ 294 pinctrl_pm_select_idle_state(omap_port->pdev); 295 udelay(1); /* wait for racing frames */ 296 } 297 298 break; 299 case ABORT_RATE_CHANGE: 300 dev_dbg(&ssi->device, "abort rate change\n"); 301 fallthrough; 302 case POST_RATE_CHANGE: 303 dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n", 304 clk_data->old_rate, clk_data->new_rate); 305 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* kHz */ 306 307 for (i = 0; i < ssi->num_ports; i++) { 308 omap_port = omap_ssi->port[i]; 309 310 if (!omap_port) 311 continue; 312 313 omap_ssi_port_update_fclk(ssi, omap_port); 314 315 /* resume ssi communication */ 316 pinctrl_pm_select_default_state(omap_port->pdev); 317 enable_irq(omap_port->wake_irq); 318 } 319 320 break; 321 default: 322 break; 323 } 324 325 return NOTIFY_DONE; 326 } 327 328 static int ssi_get_iomem(struct platform_device *pd, 329 const char *name, void __iomem **pbase, dma_addr_t *phy) 330 { 331 struct resource *mem; 332 void __iomem *base; 333 struct hsi_controller *ssi = platform_get_drvdata(pd); 334 335 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); 336 base = devm_ioremap_resource(&ssi->device, mem); 337 if (IS_ERR(base)) 338 return PTR_ERR(base); 339 340 *pbase = base; 341 342 if (phy) 343 *phy = mem->start; 344 345 return 0; 346 } 347 348 static int ssi_add_controller(struct hsi_controller *ssi, 349 struct platform_device *pd) 350 { 351 struct omap_ssi_controller *omap_ssi; 352 int err; 353 354 omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); 355 if (!omap_ssi) 356 return -ENOMEM; 357 358 err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); 359 if (err < 0) 360 return err; 361 ssi->id = err; 362 363 ssi->owner = THIS_MODULE; 364 ssi->device.parent = &pd->dev; 365 dev_set_name(&ssi->device, "ssi%d", ssi->id); 366 hsi_controller_set_drvdata(ssi, omap_ssi); 367 omap_ssi->dev = &ssi->device; 368 err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); 369 if (err < 0) 370 goto out_err; 371 err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); 372 if (err < 0) 373 goto out_err; 374 err = platform_get_irq_byname(pd, "gdd_mpu"); 375 if (err < 0) 376 goto out_err; 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_resume_and_get(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 hsi_put_controller(ssi); 509 goto out1; 510 } 511 512 pm_runtime_enable(&pd->dev); 513 514 err = ssi_hw_init(ssi); 515 if (err < 0) 516 goto out2; 517 #ifdef CONFIG_DEBUG_FS 518 err = ssi_debug_add_ctrl(ssi); 519 if (err < 0) 520 goto out2; 521 #endif 522 523 for_each_available_child_of_node(np, child) { 524 if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) 525 continue; 526 527 childpdev = of_platform_device_create(child, NULL, &pd->dev); 528 if (!childpdev) { 529 err = -ENODEV; 530 dev_err(&pd->dev, "failed to create ssi controller port\n"); 531 of_node_put(child); 532 goto out3; 533 } 534 } 535 536 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", 537 ssi->id, num_ports); 538 return err; 539 out3: 540 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 541 out2: 542 ssi_remove_controller(ssi); 543 pm_runtime_disable(&pd->dev); 544 out1: 545 platform_set_drvdata(pd, NULL); 546 547 return err; 548 } 549 550 static int ssi_remove(struct platform_device *pd) 551 { 552 struct hsi_controller *ssi = platform_get_drvdata(pd); 553 554 /* cleanup of of_platform_populate() call */ 555 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 556 557 #ifdef CONFIG_DEBUG_FS 558 ssi_debug_remove_ctrl(ssi); 559 #endif 560 ssi_remove_controller(ssi); 561 platform_set_drvdata(pd, NULL); 562 563 pm_runtime_disable(&pd->dev); 564 565 return 0; 566 } 567 568 #ifdef CONFIG_PM 569 static int omap_ssi_runtime_suspend(struct device *dev) 570 { 571 struct hsi_controller *ssi = dev_get_drvdata(dev); 572 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 573 574 dev_dbg(dev, "runtime suspend!\n"); 575 576 if (omap_ssi->get_loss) 577 omap_ssi->loss_count = 578 omap_ssi->get_loss(ssi->device.parent); 579 580 return 0; 581 } 582 583 static int omap_ssi_runtime_resume(struct device *dev) 584 { 585 struct hsi_controller *ssi = dev_get_drvdata(dev); 586 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 587 588 dev_dbg(dev, "runtime resume!\n"); 589 590 if ((omap_ssi->get_loss) && (omap_ssi->loss_count == 591 omap_ssi->get_loss(ssi->device.parent))) 592 return 0; 593 594 writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); 595 596 return 0; 597 } 598 599 static const struct dev_pm_ops omap_ssi_pm_ops = { 600 SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, 601 NULL) 602 }; 603 604 #define DEV_PM_OPS (&omap_ssi_pm_ops) 605 #else 606 #define DEV_PM_OPS NULL 607 #endif 608 609 #ifdef CONFIG_OF 610 static const struct of_device_id omap_ssi_of_match[] = { 611 { .compatible = "ti,omap3-ssi", }, 612 {}, 613 }; 614 MODULE_DEVICE_TABLE(of, omap_ssi_of_match); 615 #else 616 #define omap_ssi_of_match NULL 617 #endif 618 619 static struct platform_driver ssi_pdriver = { 620 .probe = ssi_probe, 621 .remove = ssi_remove, 622 .driver = { 623 .name = "omap_ssi", 624 .pm = DEV_PM_OPS, 625 .of_match_table = omap_ssi_of_match, 626 }, 627 }; 628 629 static int __init ssi_init(void) { 630 int ret; 631 632 ret = platform_driver_register(&ssi_pdriver); 633 if (ret) 634 return ret; 635 636 ret = platform_driver_register(&ssi_port_pdriver); 637 if (ret) { 638 platform_driver_unregister(&ssi_pdriver); 639 return ret; 640 } 641 642 return 0; 643 } 644 module_init(ssi_init); 645 646 static void __exit ssi_exit(void) { 647 platform_driver_unregister(&ssi_port_pdriver); 648 platform_driver_unregister(&ssi_pdriver); 649 } 650 module_exit(ssi_exit); 651 652 MODULE_ALIAS("platform:omap_ssi"); 653 MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); 654 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); 655 MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); 656 MODULE_LICENSE("GPL v2"); 657