1 /* OMAP SSI driver. 2 * 3 * Copyright (C) 2010 Nokia Corporation. All rights reserved. 4 * Copyright (C) 2014 Sebastian Reichel <sre@kernel.org> 5 * 6 * Contact: Carlos Chinea <carlos.chinea@nokia.com> 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * version 2 as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, but 13 * WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 20 * 02110-1301 USA 21 */ 22 23 #include <linux/compiler.h> 24 #include <linux/err.h> 25 #include <linux/ioport.h> 26 #include <linux/io.h> 27 #include <linux/clk.h> 28 #include <linux/device.h> 29 #include <linux/platform_device.h> 30 #include <linux/dma-mapping.h> 31 #include <linux/dmaengine.h> 32 #include <linux/delay.h> 33 #include <linux/seq_file.h> 34 #include <linux/scatterlist.h> 35 #include <linux/interrupt.h> 36 #include <linux/spinlock.h> 37 #include <linux/debugfs.h> 38 #include <linux/pinctrl/consumer.h> 39 #include <linux/pm_runtime.h> 40 #include <linux/of_platform.h> 41 #include <linux/hsi/hsi.h> 42 #include <linux/idr.h> 43 44 #include "omap_ssi_regs.h" 45 #include "omap_ssi.h" 46 47 /* For automatically allocated device IDs */ 48 static DEFINE_IDA(platform_omap_ssi_ida); 49 50 #ifdef CONFIG_DEBUG_FS 51 static int ssi_debug_show(struct seq_file *m, void *p __maybe_unused) 52 { 53 struct hsi_controller *ssi = m->private; 54 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 55 void __iomem *sys = omap_ssi->sys; 56 57 pm_runtime_get_sync(ssi->device.parent); 58 seq_printf(m, "REVISION\t: 0x%08x\n", readl(sys + SSI_REVISION_REG)); 59 seq_printf(m, "SYSCONFIG\t: 0x%08x\n", readl(sys + SSI_SYSCONFIG_REG)); 60 seq_printf(m, "SYSSTATUS\t: 0x%08x\n", readl(sys + SSI_SYSSTATUS_REG)); 61 pm_runtime_put(ssi->device.parent); 62 63 return 0; 64 } 65 66 static int ssi_debug_gdd_show(struct seq_file *m, void *p __maybe_unused) 67 { 68 struct hsi_controller *ssi = m->private; 69 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 70 void __iomem *gdd = omap_ssi->gdd; 71 void __iomem *sys = omap_ssi->sys; 72 int lch; 73 74 pm_runtime_get_sync(ssi->device.parent); 75 76 seq_printf(m, "GDD_MPU_STATUS\t: 0x%08x\n", 77 readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG)); 78 seq_printf(m, "GDD_MPU_ENABLE\t: 0x%08x\n\n", 79 readl(sys + SSI_GDD_MPU_IRQ_ENABLE_REG)); 80 seq_printf(m, "HW_ID\t\t: 0x%08x\n", 81 readl(gdd + SSI_GDD_HW_ID_REG)); 82 seq_printf(m, "PPORT_ID\t: 0x%08x\n", 83 readl(gdd + SSI_GDD_PPORT_ID_REG)); 84 seq_printf(m, "MPORT_ID\t: 0x%08x\n", 85 readl(gdd + SSI_GDD_MPORT_ID_REG)); 86 seq_printf(m, "TEST\t\t: 0x%08x\n", 87 readl(gdd + SSI_GDD_TEST_REG)); 88 seq_printf(m, "GCR\t\t: 0x%08x\n", 89 readl(gdd + SSI_GDD_GCR_REG)); 90 91 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 92 seq_printf(m, "\nGDD LCH %d\n=========\n", lch); 93 seq_printf(m, "CSDP\t\t: 0x%04x\n", 94 readw(gdd + SSI_GDD_CSDP_REG(lch))); 95 seq_printf(m, "CCR\t\t: 0x%04x\n", 96 readw(gdd + SSI_GDD_CCR_REG(lch))); 97 seq_printf(m, "CICR\t\t: 0x%04x\n", 98 readw(gdd + SSI_GDD_CICR_REG(lch))); 99 seq_printf(m, "CSR\t\t: 0x%04x\n", 100 readw(gdd + SSI_GDD_CSR_REG(lch))); 101 seq_printf(m, "CSSA\t\t: 0x%08x\n", 102 readl(gdd + SSI_GDD_CSSA_REG(lch))); 103 seq_printf(m, "CDSA\t\t: 0x%08x\n", 104 readl(gdd + SSI_GDD_CDSA_REG(lch))); 105 seq_printf(m, "CEN\t\t: 0x%04x\n", 106 readw(gdd + SSI_GDD_CEN_REG(lch))); 107 seq_printf(m, "CSAC\t\t: 0x%04x\n", 108 readw(gdd + SSI_GDD_CSAC_REG(lch))); 109 seq_printf(m, "CDAC\t\t: 0x%04x\n", 110 readw(gdd + SSI_GDD_CDAC_REG(lch))); 111 seq_printf(m, "CLNK_CTRL\t: 0x%04x\n", 112 readw(gdd + SSI_GDD_CLNK_CTRL_REG(lch))); 113 } 114 115 pm_runtime_put(ssi->device.parent); 116 117 return 0; 118 } 119 120 static int ssi_regs_open(struct inode *inode, struct file *file) 121 { 122 return single_open(file, ssi_debug_show, inode->i_private); 123 } 124 125 static int ssi_gdd_regs_open(struct inode *inode, struct file *file) 126 { 127 return single_open(file, ssi_debug_gdd_show, inode->i_private); 128 } 129 130 static const struct file_operations ssi_regs_fops = { 131 .open = ssi_regs_open, 132 .read = seq_read, 133 .llseek = seq_lseek, 134 .release = single_release, 135 }; 136 137 static const struct file_operations ssi_gdd_regs_fops = { 138 .open = ssi_gdd_regs_open, 139 .read = seq_read, 140 .llseek = seq_lseek, 141 .release = single_release, 142 }; 143 144 static int ssi_debug_add_ctrl(struct hsi_controller *ssi) 145 { 146 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 147 struct dentry *dir; 148 149 /* SSI controller */ 150 omap_ssi->dir = debugfs_create_dir(dev_name(&ssi->device), NULL); 151 if (!omap_ssi->dir) 152 return -ENOMEM; 153 154 debugfs_create_file("regs", S_IRUGO, omap_ssi->dir, ssi, 155 &ssi_regs_fops); 156 /* SSI GDD (DMA) */ 157 dir = debugfs_create_dir("gdd", omap_ssi->dir); 158 if (!dir) 159 goto rback; 160 debugfs_create_file("regs", S_IRUGO, dir, ssi, &ssi_gdd_regs_fops); 161 162 return 0; 163 rback: 164 debugfs_remove_recursive(omap_ssi->dir); 165 166 return -ENOMEM; 167 } 168 169 static void ssi_debug_remove_ctrl(struct hsi_controller *ssi) 170 { 171 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 172 173 debugfs_remove_recursive(omap_ssi->dir); 174 } 175 #endif /* CONFIG_DEBUG_FS */ 176 177 /* 178 * FIXME: Horrible HACK needed until we remove the useless wakeline test 179 * in the CMT. To be removed !!!! 180 */ 181 void ssi_waketest(struct hsi_client *cl, unsigned int enable) 182 { 183 struct hsi_port *port = hsi_get_port(cl); 184 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 185 struct hsi_controller *ssi = to_hsi_controller(port->device.parent); 186 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 187 188 omap_port->wktest = !!enable; 189 if (omap_port->wktest) { 190 pm_runtime_get_sync(ssi->device.parent); 191 writel_relaxed(SSI_WAKE(0), 192 omap_ssi->sys + SSI_SET_WAKE_REG(port->num)); 193 } else { 194 writel_relaxed(SSI_WAKE(0), 195 omap_ssi->sys + SSI_CLEAR_WAKE_REG(port->num)); 196 pm_runtime_put(ssi->device.parent); 197 } 198 } 199 EXPORT_SYMBOL_GPL(ssi_waketest); 200 201 static void ssi_gdd_complete(struct hsi_controller *ssi, unsigned int lch) 202 { 203 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 204 struct hsi_msg *msg = omap_ssi->gdd_trn[lch].msg; 205 struct hsi_port *port = to_hsi_port(msg->cl->device.parent); 206 struct omap_ssi_port *omap_port = hsi_port_drvdata(port); 207 unsigned int dir; 208 u32 csr; 209 u32 val; 210 211 spin_lock(&omap_ssi->lock); 212 213 val = readl(omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 214 val &= ~SSI_GDD_LCH(lch); 215 writel_relaxed(val, omap_ssi->sys + SSI_GDD_MPU_IRQ_ENABLE_REG); 216 217 if (msg->ttype == HSI_MSG_READ) { 218 dir = DMA_FROM_DEVICE; 219 val = SSI_DATAAVAILABLE(msg->channel); 220 pm_runtime_put(omap_port->pdev); 221 } else { 222 dir = DMA_TO_DEVICE; 223 val = SSI_DATAACCEPT(msg->channel); 224 /* Keep clocks reference for write pio event */ 225 } 226 dma_unmap_sg(&ssi->device, msg->sgt.sgl, msg->sgt.nents, dir); 227 csr = readw(omap_ssi->gdd + SSI_GDD_CSR_REG(lch)); 228 omap_ssi->gdd_trn[lch].msg = NULL; /* release GDD lch */ 229 dev_dbg(&port->device, "DMA completed ch %d ttype %d\n", 230 msg->channel, msg->ttype); 231 spin_unlock(&omap_ssi->lock); 232 if (csr & SSI_CSR_TOUR) { /* Timeout error */ 233 msg->status = HSI_STATUS_ERROR; 234 msg->actual_len = 0; 235 spin_lock(&omap_port->lock); 236 list_del(&msg->link); /* Dequeue msg */ 237 spin_unlock(&omap_port->lock); 238 239 list_add_tail(&msg->link, &omap_port->errqueue); 240 schedule_delayed_work(&omap_port->errqueue_work, 0); 241 return; 242 } 243 spin_lock(&omap_port->lock); 244 val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 245 writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 246 spin_unlock(&omap_port->lock); 247 248 msg->status = HSI_STATUS_COMPLETED; 249 msg->actual_len = sg_dma_len(msg->sgt.sgl); 250 } 251 252 static void ssi_gdd_tasklet(unsigned long dev) 253 { 254 struct hsi_controller *ssi = (struct hsi_controller *)dev; 255 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 256 void __iomem *sys = omap_ssi->sys; 257 unsigned int lch; 258 u32 status_reg; 259 260 pm_runtime_get(ssi->device.parent); 261 262 if (!pm_runtime_active(ssi->device.parent)) { 263 dev_warn(ssi->device.parent, "ssi_gdd_tasklet called without runtime PM!\n"); 264 pm_runtime_put(ssi->device.parent); 265 return; 266 } 267 268 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 269 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 270 if (status_reg & SSI_GDD_LCH(lch)) 271 ssi_gdd_complete(ssi, lch); 272 } 273 writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); 274 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 275 276 pm_runtime_put(ssi->device.parent); 277 278 if (status_reg) 279 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 280 else 281 enable_irq(omap_ssi->gdd_irq); 282 283 } 284 285 static irqreturn_t ssi_gdd_isr(int irq, void *ssi) 286 { 287 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 288 289 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 290 disable_irq_nosync(irq); 291 292 return IRQ_HANDLED; 293 } 294 295 static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) 296 { 297 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 298 unsigned long rate = clk_get_rate(omap_ssi->fck); 299 return rate; 300 } 301 302 static int ssi_clk_event(struct notifier_block *nb, unsigned long event, 303 void *data) 304 { 305 struct omap_ssi_controller *omap_ssi = container_of(nb, 306 struct omap_ssi_controller, fck_nb); 307 struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev); 308 struct clk_notifier_data *clk_data = data; 309 struct omap_ssi_port *omap_port; 310 int i; 311 312 switch (event) { 313 case PRE_RATE_CHANGE: 314 dev_dbg(&ssi->device, "pre rate change\n"); 315 316 for (i = 0; i < ssi->num_ports; i++) { 317 omap_port = omap_ssi->port[i]; 318 319 if (!omap_port) 320 continue; 321 322 /* Workaround for SWBREAK + CAwake down race in CMT */ 323 disable_irq(omap_port->wake_irq); 324 325 /* stop all ssi communication */ 326 pinctrl_pm_select_idle_state(omap_port->pdev); 327 udelay(1); /* wait for racing frames */ 328 } 329 330 break; 331 case ABORT_RATE_CHANGE: 332 dev_dbg(&ssi->device, "abort rate change\n"); 333 /* Fall through */ 334 case POST_RATE_CHANGE: 335 dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n", 336 clk_data->old_rate, clk_data->new_rate); 337 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* kHz */ 338 339 for (i = 0; i < ssi->num_ports; i++) { 340 omap_port = omap_ssi->port[i]; 341 342 if (!omap_port) 343 continue; 344 345 omap_ssi_port_update_fclk(ssi, omap_port); 346 347 /* resume ssi communication */ 348 pinctrl_pm_select_default_state(omap_port->pdev); 349 enable_irq(omap_port->wake_irq); 350 } 351 352 break; 353 default: 354 break; 355 } 356 357 return NOTIFY_DONE; 358 } 359 360 static int ssi_get_iomem(struct platform_device *pd, 361 const char *name, void __iomem **pbase, dma_addr_t *phy) 362 { 363 struct resource *mem; 364 void __iomem *base; 365 struct hsi_controller *ssi = platform_get_drvdata(pd); 366 367 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); 368 base = devm_ioremap_resource(&ssi->device, mem); 369 if (IS_ERR(base)) 370 return PTR_ERR(base); 371 372 *pbase = base; 373 374 if (phy) 375 *phy = mem->start; 376 377 return 0; 378 } 379 380 static int ssi_add_controller(struct hsi_controller *ssi, 381 struct platform_device *pd) 382 { 383 struct omap_ssi_controller *omap_ssi; 384 int err; 385 386 omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); 387 if (!omap_ssi) 388 return -ENOMEM; 389 390 err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); 391 if (err < 0) 392 goto out_err; 393 ssi->id = err; 394 395 ssi->owner = THIS_MODULE; 396 ssi->device.parent = &pd->dev; 397 dev_set_name(&ssi->device, "ssi%d", ssi->id); 398 hsi_controller_set_drvdata(ssi, omap_ssi); 399 omap_ssi->dev = &ssi->device; 400 err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); 401 if (err < 0) 402 goto out_err; 403 err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); 404 if (err < 0) 405 goto out_err; 406 err = platform_get_irq_byname(pd, "gdd_mpu"); 407 if (err < 0) { 408 dev_err(&pd->dev, "GDD IRQ resource missing\n"); 409 goto out_err; 410 } 411 omap_ssi->gdd_irq = err; 412 tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, 413 (unsigned long)ssi); 414 err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, 415 0, "gdd_mpu", ssi); 416 if (err < 0) { 417 dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", 418 omap_ssi->gdd_irq, err); 419 goto out_err; 420 } 421 422 omap_ssi->port = devm_kcalloc(&ssi->device, ssi->num_ports, 423 sizeof(*omap_ssi->port), GFP_KERNEL); 424 if (!omap_ssi->port) { 425 err = -ENOMEM; 426 goto out_err; 427 } 428 429 omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); 430 if (IS_ERR(omap_ssi->fck)) { 431 dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", 432 PTR_ERR(omap_ssi->fck)); 433 err = -ENODEV; 434 goto out_err; 435 } 436 437 omap_ssi->fck_nb.notifier_call = ssi_clk_event; 438 omap_ssi->fck_nb.priority = INT_MAX; 439 clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb); 440 441 /* TODO: find register, which can be used to detect context loss */ 442 omap_ssi->get_loss = NULL; 443 444 omap_ssi->max_speed = UINT_MAX; 445 spin_lock_init(&omap_ssi->lock); 446 err = hsi_register_controller(ssi); 447 448 if (err < 0) 449 goto out_err; 450 451 return 0; 452 453 out_err: 454 ida_simple_remove(&platform_omap_ssi_ida, ssi->id); 455 return err; 456 } 457 458 static int ssi_hw_init(struct hsi_controller *ssi) 459 { 460 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 461 int err; 462 463 err = pm_runtime_get_sync(ssi->device.parent); 464 if (err < 0) { 465 dev_err(&ssi->device, "runtime PM failed %d\n", err); 466 return err; 467 } 468 /* Resetting GDD */ 469 writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); 470 /* Get FCK rate in kHz */ 471 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); 472 dev_dbg(&ssi->device, "SSI fck rate %lu kHz\n", omap_ssi->fck_rate); 473 474 writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); 475 omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; 476 pm_runtime_put_sync(ssi->device.parent); 477 478 return 0; 479 } 480 481 static void ssi_remove_controller(struct hsi_controller *ssi) 482 { 483 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 484 int id = ssi->id; 485 tasklet_kill(&omap_ssi->gdd_tasklet); 486 hsi_unregister_controller(ssi); 487 clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb); 488 ida_simple_remove(&platform_omap_ssi_ida, id); 489 } 490 491 static inline int ssi_of_get_available_ports_count(const struct device_node *np) 492 { 493 struct device_node *child; 494 int num = 0; 495 496 for_each_available_child_of_node(np, child) 497 if (of_device_is_compatible(child, "ti,omap3-ssi-port")) 498 num++; 499 500 return num; 501 } 502 503 static int ssi_remove_ports(struct device *dev, void *c) 504 { 505 struct platform_device *pdev = to_platform_device(dev); 506 507 if (!dev->of_node) 508 return 0; 509 510 of_node_clear_flag(dev->of_node, OF_POPULATED); 511 of_device_unregister(pdev); 512 513 return 0; 514 } 515 516 static int ssi_probe(struct platform_device *pd) 517 { 518 struct platform_device *childpdev; 519 struct device_node *np = pd->dev.of_node; 520 struct device_node *child; 521 struct hsi_controller *ssi; 522 int err; 523 int num_ports; 524 525 if (!np) { 526 dev_err(&pd->dev, "missing device tree data\n"); 527 return -EINVAL; 528 } 529 530 num_ports = ssi_of_get_available_ports_count(np); 531 532 ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); 533 if (!ssi) { 534 dev_err(&pd->dev, "No memory for controller\n"); 535 return -ENOMEM; 536 } 537 538 platform_set_drvdata(pd, ssi); 539 540 err = ssi_add_controller(ssi, pd); 541 if (err < 0) 542 goto out1; 543 544 pm_runtime_enable(&pd->dev); 545 546 err = ssi_hw_init(ssi); 547 if (err < 0) 548 goto out2; 549 #ifdef CONFIG_DEBUG_FS 550 err = ssi_debug_add_ctrl(ssi); 551 if (err < 0) 552 goto out2; 553 #endif 554 555 for_each_available_child_of_node(np, child) { 556 if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) 557 continue; 558 559 childpdev = of_platform_device_create(child, NULL, &pd->dev); 560 if (!childpdev) { 561 err = -ENODEV; 562 dev_err(&pd->dev, "failed to create ssi controller port\n"); 563 goto out3; 564 } 565 } 566 567 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", 568 ssi->id, num_ports); 569 return err; 570 out3: 571 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 572 out2: 573 ssi_remove_controller(ssi); 574 out1: 575 platform_set_drvdata(pd, NULL); 576 pm_runtime_disable(&pd->dev); 577 578 return err; 579 } 580 581 static int ssi_remove(struct platform_device *pd) 582 { 583 struct hsi_controller *ssi = platform_get_drvdata(pd); 584 585 /* cleanup of of_platform_populate() call */ 586 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 587 588 #ifdef CONFIG_DEBUG_FS 589 ssi_debug_remove_ctrl(ssi); 590 #endif 591 ssi_remove_controller(ssi); 592 platform_set_drvdata(pd, NULL); 593 594 pm_runtime_disable(&pd->dev); 595 596 return 0; 597 } 598 599 #ifdef CONFIG_PM 600 static int omap_ssi_runtime_suspend(struct device *dev) 601 { 602 struct hsi_controller *ssi = dev_get_drvdata(dev); 603 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 604 605 dev_dbg(dev, "runtime suspend!\n"); 606 607 if (omap_ssi->get_loss) 608 omap_ssi->loss_count = 609 omap_ssi->get_loss(ssi->device.parent); 610 611 return 0; 612 } 613 614 static int omap_ssi_runtime_resume(struct device *dev) 615 { 616 struct hsi_controller *ssi = dev_get_drvdata(dev); 617 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 618 619 dev_dbg(dev, "runtime resume!\n"); 620 621 if ((omap_ssi->get_loss) && (omap_ssi->loss_count == 622 omap_ssi->get_loss(ssi->device.parent))) 623 return 0; 624 625 writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); 626 627 return 0; 628 } 629 630 static const struct dev_pm_ops omap_ssi_pm_ops = { 631 SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, 632 NULL) 633 }; 634 635 #define DEV_PM_OPS (&omap_ssi_pm_ops) 636 #else 637 #define DEV_PM_OPS NULL 638 #endif 639 640 #ifdef CONFIG_OF 641 static const struct of_device_id omap_ssi_of_match[] = { 642 { .compatible = "ti,omap3-ssi", }, 643 {}, 644 }; 645 MODULE_DEVICE_TABLE(of, omap_ssi_of_match); 646 #else 647 #define omap_ssi_of_match NULL 648 #endif 649 650 static struct platform_driver ssi_pdriver = { 651 .probe = ssi_probe, 652 .remove = ssi_remove, 653 .driver = { 654 .name = "omap_ssi", 655 .pm = DEV_PM_OPS, 656 .of_match_table = omap_ssi_of_match, 657 }, 658 }; 659 660 static int __init ssi_init(void) { 661 int ret; 662 663 ret = platform_driver_register(&ssi_pdriver); 664 if (ret) 665 return ret; 666 667 return platform_driver_register(&ssi_port_pdriver); 668 } 669 module_init(ssi_init); 670 671 static void __exit ssi_exit(void) { 672 platform_driver_unregister(&ssi_port_pdriver); 673 platform_driver_unregister(&ssi_pdriver); 674 } 675 module_exit(ssi_exit); 676 677 MODULE_ALIAS("platform:omap_ssi"); 678 MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); 679 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); 680 MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); 681 MODULE_LICENSE("GPL v2"); 682