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/gpio.h> 28#include <linux/clk.h> 29#include <linux/device.h> 30#include <linux/platform_device.h> 31#include <linux/dma-mapping.h> 32#include <linux/dmaengine.h> 33#include <linux/delay.h> 34#include <linux/seq_file.h> 35#include <linux/scatterlist.h> 36#include <linux/interrupt.h> 37#include <linux/spinlock.h> 38#include <linux/debugfs.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 */ 48static DEFINE_IDA(platform_omap_ssi_ida); 49 50#ifdef CONFIG_DEBUG_FS 51static 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 66static 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 120static int ssi_regs_open(struct inode *inode, struct file *file) 121{ 122 return single_open(file, ssi_debug_show, inode->i_private); 123} 124 125static 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 130static 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 137static 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 144static int __init 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; 163rback: 164 debugfs_remove_recursive(omap_ssi->dir); 165 166 return -ENOMEM; 167} 168 169static 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 */ 181void 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} 199EXPORT_SYMBOL_GPL(ssi_waketest); 200 201static 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 250static 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 277static 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 287static 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 294static int __init ssi_get_iomem(struct platform_device *pd, 295 const char *name, void __iomem **pbase, dma_addr_t *phy) 296{ 297 struct resource *mem; 298 void __iomem *base; 299 struct hsi_controller *ssi = platform_get_drvdata(pd); 300 301 mem = platform_get_resource_byname(pd, IORESOURCE_MEM, name); 302 base = devm_ioremap_resource(&ssi->device, mem); 303 if (IS_ERR(base)) 304 return PTR_ERR(base); 305 306 *pbase = base; 307 308 if (phy) 309 *phy = mem->start; 310 311 return 0; 312} 313 314static int __init ssi_add_controller(struct hsi_controller *ssi, 315 struct platform_device *pd) 316{ 317 struct omap_ssi_controller *omap_ssi; 318 int err; 319 320 omap_ssi = devm_kzalloc(&ssi->device, sizeof(*omap_ssi), GFP_KERNEL); 321 if (!omap_ssi) { 322 dev_err(&pd->dev, "not enough memory for omap ssi\n"); 323 return -ENOMEM; 324 } 325 326 ssi->id = ida_simple_get(&platform_omap_ssi_ida, 0, 0, GFP_KERNEL); 327 if (ssi->id < 0) { 328 err = ssi->id; 329 goto out_err; 330 } 331 332 ssi->owner = THIS_MODULE; 333 ssi->device.parent = &pd->dev; 334 dev_set_name(&ssi->device, "ssi%d", ssi->id); 335 hsi_controller_set_drvdata(ssi, omap_ssi); 336 omap_ssi->dev = &ssi->device; 337 err = ssi_get_iomem(pd, "sys", &omap_ssi->sys, NULL); 338 if (err < 0) 339 goto out_err; 340 err = ssi_get_iomem(pd, "gdd", &omap_ssi->gdd, NULL); 341 if (err < 0) 342 goto out_err; 343 err = platform_get_irq_byname(pd, "gdd_mpu"); 344 if (err < 0) { 345 dev_err(&pd->dev, "GDD IRQ resource missing\n"); 346 goto out_err; 347 } 348 omap_ssi->gdd_irq = err; 349 tasklet_init(&omap_ssi->gdd_tasklet, ssi_gdd_tasklet, 350 (unsigned long)ssi); 351 err = devm_request_irq(&ssi->device, omap_ssi->gdd_irq, ssi_gdd_isr, 352 0, "gdd_mpu", ssi); 353 if (err < 0) { 354 dev_err(&ssi->device, "Request GDD IRQ %d failed (%d)", 355 omap_ssi->gdd_irq, err); 356 goto out_err; 357 } 358 359 omap_ssi->port = devm_kzalloc(&ssi->device, 360 sizeof(struct omap_ssi_port *) * ssi->num_ports, GFP_KERNEL); 361 if (!omap_ssi->port) { 362 err = -ENOMEM; 363 goto out_err; 364 } 365 366 omap_ssi->fck = devm_clk_get(&ssi->device, "ssi_ssr_fck"); 367 if (IS_ERR(omap_ssi->fck)) { 368 dev_err(&pd->dev, "Could not acquire clock \"ssi_ssr_fck\": %li\n", 369 PTR_ERR(omap_ssi->fck)); 370 err = -ENODEV; 371 goto out_err; 372 } 373 374 /* TODO: find register, which can be used to detect context loss */ 375 omap_ssi->get_loss = NULL; 376 377 omap_ssi->max_speed = UINT_MAX; 378 spin_lock_init(&omap_ssi->lock); 379 err = hsi_register_controller(ssi); 380 381 if (err < 0) 382 goto out_err; 383 384 return 0; 385 386out_err: 387 ida_simple_remove(&platform_omap_ssi_ida, ssi->id); 388 return err; 389} 390 391static int __init ssi_hw_init(struct hsi_controller *ssi) 392{ 393 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 394 unsigned int i; 395 u32 val; 396 int err; 397 398 err = pm_runtime_get_sync(ssi->device.parent); 399 if (err < 0) { 400 dev_err(&ssi->device, "runtime PM failed %d\n", err); 401 return err; 402 } 403 /* Reseting SSI controller */ 404 writel_relaxed(SSI_SOFTRESET, omap_ssi->sys + SSI_SYSCONFIG_REG); 405 val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); 406 for (i = 0; ((i < 20) && !(val & SSI_RESETDONE)); i++) { 407 msleep(20); 408 val = readl(omap_ssi->sys + SSI_SYSSTATUS_REG); 409 } 410 if (!(val & SSI_RESETDONE)) { 411 dev_err(&ssi->device, "SSI HW reset failed\n"); 412 pm_runtime_put_sync(ssi->device.parent); 413 return -EIO; 414 } 415 /* Reseting GDD */ 416 writel_relaxed(SSI_SWRESET, omap_ssi->gdd + SSI_GDD_GRST_REG); 417 /* Get FCK rate in KHz */ 418 omap_ssi->fck_rate = DIV_ROUND_CLOSEST(ssi_get_clk_rate(ssi), 1000); 419 dev_dbg(&ssi->device, "SSI fck rate %lu KHz\n", omap_ssi->fck_rate); 420 /* Set default PM settings */ 421 val = SSI_AUTOIDLE | SSI_SIDLEMODE_SMART | SSI_MIDLEMODE_SMART; 422 writel_relaxed(val, omap_ssi->sys + SSI_SYSCONFIG_REG); 423 omap_ssi->sysconfig = val; 424 writel_relaxed(SSI_CLK_AUTOGATING_ON, omap_ssi->sys + SSI_GDD_GCR_REG); 425 omap_ssi->gdd_gcr = SSI_CLK_AUTOGATING_ON; 426 pm_runtime_put_sync(ssi->device.parent); 427 428 return 0; 429} 430 431static void ssi_remove_controller(struct hsi_controller *ssi) 432{ 433 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 434 int id = ssi->id; 435 tasklet_kill(&omap_ssi->gdd_tasklet); 436 hsi_unregister_controller(ssi); 437 ida_simple_remove(&platform_omap_ssi_ida, id); 438} 439 440static inline int ssi_of_get_available_ports_count(const struct device_node *np) 441{ 442 struct device_node *child; 443 int num = 0; 444 445 for_each_available_child_of_node(np, child) 446 if (of_device_is_compatible(child, "ti,omap3-ssi-port")) 447 num++; 448 449 return num; 450} 451 452static int ssi_remove_ports(struct device *dev, void *c) 453{ 454 struct platform_device *pdev = to_platform_device(dev); 455 456 of_device_unregister(pdev); 457 458 return 0; 459} 460 461static int __init ssi_probe(struct platform_device *pd) 462{ 463 struct platform_device *childpdev; 464 struct device_node *np = pd->dev.of_node; 465 struct device_node *child; 466 struct hsi_controller *ssi; 467 int err; 468 int num_ports; 469 470 if (!np) { 471 dev_err(&pd->dev, "missing device tree data\n"); 472 return -EINVAL; 473 } 474 475 num_ports = ssi_of_get_available_ports_count(np); 476 477 ssi = hsi_alloc_controller(num_ports, GFP_KERNEL); 478 if (!ssi) { 479 dev_err(&pd->dev, "No memory for controller\n"); 480 return -ENOMEM; 481 } 482 483 platform_set_drvdata(pd, ssi); 484 485 err = ssi_add_controller(ssi, pd); 486 if (err < 0) 487 goto out1; 488 489 pm_runtime_irq_safe(&pd->dev); 490 pm_runtime_enable(&pd->dev); 491 492 err = ssi_hw_init(ssi); 493 if (err < 0) 494 goto out2; 495#ifdef CONFIG_DEBUG_FS 496 err = ssi_debug_add_ctrl(ssi); 497 if (err < 0) 498 goto out2; 499#endif 500 501 for_each_available_child_of_node(np, child) { 502 if (!of_device_is_compatible(child, "ti,omap3-ssi-port")) 503 continue; 504 505 childpdev = of_platform_device_create(child, NULL, &pd->dev); 506 if (!childpdev) { 507 err = -ENODEV; 508 dev_err(&pd->dev, "failed to create ssi controller port\n"); 509 goto out3; 510 } 511 } 512 513 dev_info(&pd->dev, "ssi controller %d initialized (%d ports)!\n", 514 ssi->id, num_ports); 515 return err; 516out3: 517 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 518out2: 519 ssi_remove_controller(ssi); 520out1: 521 platform_set_drvdata(pd, NULL); 522 pm_runtime_disable(&pd->dev); 523 524 return err; 525} 526 527static int __exit ssi_remove(struct platform_device *pd) 528{ 529 struct hsi_controller *ssi = platform_get_drvdata(pd); 530 531#ifdef CONFIG_DEBUG_FS 532 ssi_debug_remove_ctrl(ssi); 533#endif 534 ssi_remove_controller(ssi); 535 platform_set_drvdata(pd, NULL); 536 537 pm_runtime_disable(&pd->dev); 538 539 /* cleanup of of_platform_populate() call */ 540 device_for_each_child(&pd->dev, NULL, ssi_remove_ports); 541 542 return 0; 543} 544 545#ifdef CONFIG_PM 546static int omap_ssi_runtime_suspend(struct device *dev) 547{ 548 struct hsi_controller *ssi = dev_get_drvdata(dev); 549 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 550 551 dev_dbg(dev, "runtime suspend!\n"); 552 553 if (omap_ssi->get_loss) 554 omap_ssi->loss_count = 555 omap_ssi->get_loss(ssi->device.parent); 556 557 return 0; 558} 559 560static int omap_ssi_runtime_resume(struct device *dev) 561{ 562 struct hsi_controller *ssi = dev_get_drvdata(dev); 563 struct omap_ssi_controller *omap_ssi = hsi_controller_drvdata(ssi); 564 565 dev_dbg(dev, "runtime resume!\n"); 566 567 if ((omap_ssi->get_loss) && (omap_ssi->loss_count == 568 omap_ssi->get_loss(ssi->device.parent))) 569 return 0; 570 571 writel_relaxed(omap_ssi->gdd_gcr, omap_ssi->gdd + SSI_GDD_GCR_REG); 572 573 return 0; 574} 575 576static const struct dev_pm_ops omap_ssi_pm_ops = { 577 SET_RUNTIME_PM_OPS(omap_ssi_runtime_suspend, omap_ssi_runtime_resume, 578 NULL) 579}; 580 581#define DEV_PM_OPS (&omap_ssi_pm_ops) 582#else 583#define DEV_PM_OPS NULL 584#endif 585 586#ifdef CONFIG_OF 587static const struct of_device_id omap_ssi_of_match[] = { 588 { .compatible = "ti,omap3-ssi", }, 589 {}, 590}; 591MODULE_DEVICE_TABLE(of, omap_ssi_of_match); 592#else 593#define omap_ssi_of_match NULL 594#endif 595 596static struct platform_driver ssi_pdriver = { 597 .remove = __exit_p(ssi_remove), 598 .driver = { 599 .name = "omap_ssi", 600 .pm = DEV_PM_OPS, 601 .of_match_table = omap_ssi_of_match, 602 }, 603}; 604 605module_platform_driver_probe(ssi_pdriver, ssi_probe); 606 607MODULE_ALIAS("platform:omap_ssi"); 608MODULE_AUTHOR("Carlos Chinea <carlos.chinea@nokia.com>"); 609MODULE_AUTHOR("Sebastian Reichel <sre@kernel.org>"); 610MODULE_DESCRIPTION("Synchronous Serial Interface Driver"); 611MODULE_LICENSE("GPL v2"); 612