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_sync(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_sync(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_sync(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_sync(ssi->device.parent); 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 msg->complete(msg); 239 return; 240 } 241 spin_lock(&omap_port->lock); 242 val |= readl(omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 243 writel_relaxed(val, omap_ssi->sys + SSI_MPU_ENABLE_REG(port->num, 0)); 244 spin_unlock(&omap_port->lock); 245 246 msg->status = HSI_STATUS_COMPLETED; 247 msg->actual_len = sg_dma_len(msg->sgt.sgl); 248 } 249 250 static void ssi_gdd_tasklet(unsigned long dev) 251 { 252 struct hsi_controller *ssi = (struct hsi_controller *)dev; 253 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 254 void __iomem *sys = omap_ssi->sys; 255 unsigned int lch; 256 u32 status_reg; 257 258 pm_runtime_get_sync(ssi->device.parent); 259 260 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 261 for (lch = 0; lch < SSI_MAX_GDD_LCH; lch++) { 262 if (status_reg & SSI_GDD_LCH(lch)) 263 ssi_gdd_complete(ssi, lch); 264 } 265 writel_relaxed(status_reg, sys + SSI_GDD_MPU_IRQ_STATUS_REG); 266 status_reg = readl(sys + SSI_GDD_MPU_IRQ_STATUS_REG); 267 268 pm_runtime_put_sync(ssi->device.parent); 269 270 if (status_reg) 271 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 272 else 273 enable_irq(omap_ssi->gdd_irq); 274 275 } 276 277 static irqreturn_t ssi_gdd_isr(int irq, void *ssi) 278 { 279 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 280 281 tasklet_hi_schedule(&omap_ssi->gdd_tasklet); 282 disable_irq_nosync(irq); 283 284 return IRQ_HANDLED; 285 } 286 287 static unsigned long ssi_get_clk_rate(struct hsi_controller *ssi) 288 { 289 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 290 unsigned long rate = clk_get_rate(omap_ssi->fck); 291 return rate; 292 } 293 294 static int ssi_clk_event(struct notifier_block *nb, unsigned long event, 295 void *data) 296 { 297 struct omap_ssi_controller *omap_ssi = container_of(nb, 298 struct omap_ssi_controller, fck_nb); 299 struct hsi_controller *ssi = to_hsi_controller(omap_ssi->dev); 300 struct clk_notifier_data *clk_data = data; 301 struct omap_ssi_port *omap_port; 302 int i; 303 304 switch (event) { 305 case PRE_RATE_CHANGE: 306 dev_dbg(&ssi->device, "pre rate change\n"); 307 308 for (i = 0; i < ssi->num_ports; i++) { 309 omap_port = omap_ssi->port[i]; 310 311 if (!omap_port) 312 continue; 313 314 /* Workaround for SWBREAK + CAwake down race in CMT */ 315 tasklet_disable(&omap_port->wake_tasklet); 316 317 /* stop all ssi communication */ 318 pinctrl_pm_select_idle_state(omap_port->pdev); 319 udelay(1); /* wait for racing frames */ 320 } 321 322 break; 323 case ABORT_RATE_CHANGE: 324 dev_dbg(&ssi->device, "abort rate change\n"); 325 /* Fall through */ 326 case POST_RATE_CHANGE: 327 dev_dbg(&ssi->device, "post rate change (%lu -> %lu)\n", 328 clk_data->old_rate, clk_data->new_rate); 329 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(clk_data->new_rate, 1000); /* KHz */ 330 331 for (i = 0; i < ssi->num_ports; i++) { 332 omap_port = omap_ssi->port[i]; 333 334 if (!omap_port) 335 continue; 336 337 omap_ssi_port_update_fclk(ssi, omap_port); 338 339 /* resume ssi communication */ 340 pinctrl_pm_select_default_state(omap_port->pdev); 341 tasklet_enable(&omap_port->wake_tasklet); 342 } 343 344 break; 345 default: 346 break; 347 } 348 349 return NOTIFY_DONE; 350 } 351 352 static int ssi_get_iomem(struct platform_device *pd, 353 const char *name, void __iomem **pbase, dma_addr_t *phy) 354 { 355 struct resource *mem; 356 void __iomem *base; 357 struct hsi_controller *ssi = platform_get_drvdata(pd); 358 359 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); 360 base = devm_ioremap_resource(&ssi->device, mem); 361 if (IS_ERR(base)) 362 return PTR_ERR(base); 363 364 *pbase = base; 365 366 if (phy) 367 *phy = mem->start; 368 369 return 0; 370 } 371 372 static int ssi_add_controller(struct hsi_controller *ssi, 373 struct platform_device *pd) 374 { 375 struct omap_ssi_controller *omap_ssi; 376 int err; 377 378 omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); 379 if (!omap_ssi) { 380 dev_err(&pd->dev, "not enough memory for omap ssi\n"); 381 return -ENOMEM; 382 } 383 384 err = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); 385 if (err < 0) 386 goto out_err; 387 ssi->id = err; 388 389 ssi->owner = THIS_MODULE; 390 ssi->device.parent = &pd->dev; 391 dev_set_name(&ssi->device, "ssi%d", ssi->id); 392 hsi_controller_set_drvdata(ssi, omap_ssi); 393 omap_ssi->dev = &ssi->device; 394 err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); 395 if (err < 0) 396 goto out_err; 397 err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); 398 if (err < 0) 399 goto out_err; 400 err = platform_get_irq_byname(pd, "gdd_mpu"); 401 if (err < 0) { 402 dev_err(&pd->dev, "GDD IRQ resource missing\n"); 403 goto out_err; 404 } 405 omap_ssi->gdd_irq = err; 406 tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, 407 (unsigned long)ssi); 408 err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, 409 0, "gdd_mpu", ssi); 410 if (err < 0) { 411 dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", 412 omap_ssi->gdd_irq, err); 413 goto out_err; 414 } 415 416 omap_ssi->port = devm_kzalloc(&ssi->device, 417 sizeof(struct omap_ssi_port *) * ssi->num_ports, GFP_KERNEL); 418 if (!omap_ssi->port) { 419 err = -ENOMEM; 420 goto out_err; 421 } 422 423 omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); 424 if (IS_ERR(omap_ssi->fck)) { 425 dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", 426 PTR_ERR(omap_ssi->fck)); 427 err = -ENODEV; 428 goto out_err; 429 } 430 431 omap_ssi->fck_nb.notifier_call = ssi_clk_event; 432 omap_ssi->fck_nb.priority = INT_MAX; 433 clk_notifier_register(omap_ssi->fck, &omap_ssi->fck_nb); 434 435 /* TODO: find register, which can be used to detect context loss */ 436 omap_ssi->get_loss = NULL; 437 438 omap_ssi->max_speed = UINT_MAX; 439 spin_lock_init(&omap_ssi->lock); 440 err = hsi_register_controller(ssi); 441 442 if (err < 0) 443 goto out_err; 444 445 return 0; 446 447 out_err: 448 ida_simple_remove(&platform_omap_ssi_ida, ssi->id); 449 return err; 450 } 451 452 static int ssi_hw_init(struct hsi_controller *ssi) 453 { 454 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 455 unsigned int i; 456 u32 val; 457 int err; 458 459 err = pm_runtime_get_sync(ssi->device.parent); 460 if (err < 0) { 461 dev_err(&ssi->device, "runtime PM failed %d\n", err); 462 return err; 463 } 464 /* Reseting SSI controller */ 465 writel_relaxed(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG); 466 val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); 467 for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) { 468 msleep(20); 469 val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); 470 } 471 if (!(val & SSI_RESETDONE)) { 472 dev_err(&ssi->device, "SSI HW reset failed\n"); 473 pm_runtime_put_sync(ssi->device.parent); 474 return -EIO; 475 } 476 /* Reseting GDD */ 477 writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); 478 /* Get FCK rate in KHz */ 479 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); 480 dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate); 481 /* Set default PM settings */ 482 val = SSI_AUTOIDLE | SSI_SIDLEMODE_SMART | SSI_MIDLEMODE_SMART; 483 writel_relaxed(val, omap_ssi->sys + SSI_SYSCONFIG_REG); 484 omap_ssi->sysconfig = val; 485 writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); 486 omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; 487 pm_runtime_put_sync(ssi->device.parent); 488 489 return 0; 490 } 491 492 static void ssi_remove_controller(struct hsi_controller *ssi) 493 { 494 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 495 int id = ssi->id; 496 tasklet_kill(&omap_ssi->gdd_tasklet); 497 hsi_unregister_controller(ssi); 498 clk_notifier_unregister(omap_ssi->fck, &omap_ssi->fck_nb); 499 ida_simple_remove(&platform_omap_ssi_ida, id); 500 } 501 502 static inline int ssi_of_get_available_ports_count(const struct device_node *np) 503 { 504 struct device_node *child; 505 int num = 0; 506 507 for_each_available_child_of_node(np, child) 508 if (of_device_is_compatible(child, "ti,omap3-ssi-port")) 509 num++; 510 511 return num; 512 } 513 514 static int ssi_remove_ports(struct device *dev, void *c) 515 { 516 struct platform_device *pdev = to_platform_device(dev); 517 518 if (!dev->of_node) 519 return 0; 520 521 of_node_clear_flag(dev->of_node, OF_POPULATED); 522 of_device_unregister(pdev); 523 524 return 0; 525 } 526 527 static int ssi_probe(struct platform_device *pd) 528 { 529 struct platform_device *childpdev; 530 struct device_node *np = pd->dev.of_node; 531 struct device_node *child; 532 struct hsi_controller *ssi; 533 int err; 534 int num_ports; 535 536 if (!np) { 537 dev_err(&pd->dev, "missing device tree data\n"); 538 return -EINVAL; 539 } 540 541 num_ports = ssi_of_get_available_ports_count(np); 542 543 ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); 544 if (!ssi) { 545 dev_err(&pd->dev, "No memory for controller\n"); 546 return -ENOMEM; 547 } 548 549 platform_set_drvdata(pd, ssi); 550 551 err = ssi_add_controller(ssi, pd); 552 if (err < 0) 553 goto out1; 554 555 pm_runtime_irq_safe(&pd->dev); 556 pm_runtime_enable(&pd->dev); 557 558 err = ssi_hw_init(ssi); 559 if (err < 0) 560 goto out2; 561 #ifdef CONFIG_DEBUG_FS 562 err = ssi_debug_add_ctrl(ssi); 563 if (err < 0) 564 goto out2; 565 #endif 566 567 for_each_available_child_of_node(np, child) { 568 if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) 569 continue; 570 571 childpdev = of_platform_device_create(child, NULL, &pd->dev); 572 if (!childpdev) { 573 err = -ENODEV; 574 dev_err(&pd->dev, "failed to create ssi controller port\n"); 575 goto out3; 576 } 577 } 578 579 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", 580 ssi->id, num_ports); 581 return err; 582 out3: 583 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 584 out2: 585 ssi_remove_controller(ssi); 586 out1: 587 platform_set_drvdata(pd, NULL); 588 pm_runtime_disable(&pd->dev); 589 590 return err; 591 } 592 593 static int ssi_remove(struct platform_device *pd) 594 { 595 struct hsi_controller *ssi = platform_get_drvdata(pd); 596 597 /* cleanup of of_platform_populate() call */ 598 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 599 600 #ifdef CONFIG_DEBUG_FS 601 ssi_debug_remove_ctrl(ssi); 602 #endif 603 ssi_remove_controller(ssi); 604 platform_set_drvdata(pd, NULL); 605 606 pm_runtime_disable(&pd->dev); 607 608 return 0; 609 } 610 611 #ifdef CONFIG_PM 612 static int omap_ssi_runtime_suspend(struct device *dev) 613 { 614 struct hsi_controller *ssi = dev_get_drvdata(dev); 615 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 616 617 dev_dbg(dev, "runtime suspend!\n"); 618 619 if (omap_ssi->get_loss) 620 omap_ssi->loss_count = 621 omap_ssi->get_loss(ssi->device.parent); 622 623 return 0; 624 } 625 626 static int omap_ssi_runtime_resume(struct device *dev) 627 { 628 struct hsi_controller *ssi = dev_get_drvdata(dev); 629 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 630 631 dev_dbg(dev, "runtime resume!\n"); 632 633 if ((omap_ssi->get_loss) && (omap_ssi->loss_count == 634 omap_ssi->get_loss(ssi->device.parent))) 635 return 0; 636 637 writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); 638 639 return 0; 640 } 641 642 static const struct dev_pm_ops omap_ssi_pm_ops = { 643 SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, 644 NULL) 645 }; 646 647 #define DEV_PM_OPS (&omap_ssi_pm_ops) 648 #else 649 #define DEV_PM_OPS NULL 650 #endif 651 652 #ifdef CONFIG_OF 653 static const struct of_device_id omap_ssi_of_match[] = { 654 { .compatible = "ti,omap3-ssi", }, 655 {}, 656 }; 657 MODULE_DEVICE_TABLE(of, omap_ssi_of_match); 658 #else 659 #define omap_ssi_of_match NULL 660 #endif 661 662 static struct platform_driver ssi_pdriver = { 663 .probe = ssi_probe, 664 .remove = ssi_remove, 665 .driver = { 666 .name = "omap_ssi", 667 .pm = DEV_PM_OPS, 668 .of_match_table = omap_ssi_of_match, 669 }, 670 }; 671 672 static int __init ssi_init(void) { 673 int ret; 674 675 ret = platform_driver_register(&ssi_pdriver); 676 if (ret) 677 return ret; 678 679 return platform_driver_register(&ssi_port_pdriver); 680 } 681 module_init(ssi_init); 682 683 static void __exit ssi_exit(void) { 684 platform_driver_unregister(&ssi_port_pdriver); 685 platform_driver_unregister(&ssi_pdriver); 686 } 687 module_exit(ssi_exit); 688 689 MODULE_ALIAS("platform:omap_ssi"); 690 MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); 691 MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); 692 MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); 693 MODULE_LICENSE("GPL v2"); 694