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1 /* OMAP SSI driver.

2 *

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 */

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>

44 #include "omap_ssi_regs.h"

45 #include "omap_ssi.h"

47 /* For automatically allocated device IDs */

48 static DEFINE_IDA(platform_omap_ssi_ida);

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;

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);

63 return 0;

64 }

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;

74 pm_runtime_get_sync(ssi->device.parent);

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));

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");