1 /* 2 * SPI driver for Nvidia's Tegra20 Serial Flash Controller. 3 * 4 * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved. 5 * 6 * Author: Laxman Dewangan <ldewangan@nvidia.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms and conditions 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 it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #include <linux/clk.h> 22 #include <linux/completion.h> 23 #include <linux/delay.h> 24 #include <linux/err.h> 25 #include <linux/init.h> 26 #include <linux/interrupt.h> 27 #include <linux/io.h> 28 #include <linux/kernel.h> 29 #include <linux/kthread.h> 30 #include <linux/module.h> 31 #include <linux/platform_device.h> 32 #include <linux/pm_runtime.h> 33 #include <linux/of.h> 34 #include <linux/of_device.h> 35 #include <linux/spi/spi.h> 36 #include <linux/clk/tegra.h> 37 38 #define SPI_COMMAND 0x000 39 #define SPI_GO BIT(30) 40 #define SPI_M_S BIT(28) 41 #define SPI_ACTIVE_SCLK_MASK (0x3 << 26) 42 #define SPI_ACTIVE_SCLK_DRIVE_LOW (0 << 26) 43 #define SPI_ACTIVE_SCLK_DRIVE_HIGH (1 << 26) 44 #define SPI_ACTIVE_SCLK_PULL_LOW (2 << 26) 45 #define SPI_ACTIVE_SCLK_PULL_HIGH (3 << 26) 46 47 #define SPI_CK_SDA_FALLING (1 << 21) 48 #define SPI_CK_SDA_RISING (0 << 21) 49 #define SPI_CK_SDA_MASK (1 << 21) 50 #define SPI_ACTIVE_SDA (0x3 << 18) 51 #define SPI_ACTIVE_SDA_DRIVE_LOW (0 << 18) 52 #define SPI_ACTIVE_SDA_DRIVE_HIGH (1 << 18) 53 #define SPI_ACTIVE_SDA_PULL_LOW (2 << 18) 54 #define SPI_ACTIVE_SDA_PULL_HIGH (3 << 18) 55 56 #define SPI_CS_POL_INVERT BIT(16) 57 #define SPI_TX_EN BIT(15) 58 #define SPI_RX_EN BIT(14) 59 #define SPI_CS_VAL_HIGH BIT(13) 60 #define SPI_CS_VAL_LOW 0x0 61 #define SPI_CS_SW BIT(12) 62 #define SPI_CS_HW 0x0 63 #define SPI_CS_DELAY_MASK (7 << 9) 64 #define SPI_CS3_EN BIT(8) 65 #define SPI_CS2_EN BIT(7) 66 #define SPI_CS1_EN BIT(6) 67 #define SPI_CS0_EN BIT(5) 68 69 #define SPI_CS_MASK (SPI_CS3_EN | SPI_CS2_EN | \ 70 SPI_CS1_EN | SPI_CS0_EN) 71 #define SPI_BIT_LENGTH(x) (((x) & 0x1f) << 0) 72 73 #define SPI_MODES (SPI_ACTIVE_SCLK_MASK | SPI_CK_SDA_MASK) 74 75 #define SPI_STATUS 0x004 76 #define SPI_BSY BIT(31) 77 #define SPI_RDY BIT(30) 78 #define SPI_TXF_FLUSH BIT(29) 79 #define SPI_RXF_FLUSH BIT(28) 80 #define SPI_RX_UNF BIT(27) 81 #define SPI_TX_OVF BIT(26) 82 #define SPI_RXF_EMPTY BIT(25) 83 #define SPI_RXF_FULL BIT(24) 84 #define SPI_TXF_EMPTY BIT(23) 85 #define SPI_TXF_FULL BIT(22) 86 #define SPI_BLK_CNT(count) (((count) & 0xffff) + 1) 87 88 #define SPI_FIFO_ERROR (SPI_RX_UNF | SPI_TX_OVF) 89 #define SPI_FIFO_EMPTY (SPI_TX_EMPTY | SPI_RX_EMPTY) 90 91 #define SPI_RX_CMP 0x8 92 #define SPI_DMA_CTL 0x0C 93 #define SPI_DMA_EN BIT(31) 94 #define SPI_IE_RXC BIT(27) 95 #define SPI_IE_TXC BIT(26) 96 #define SPI_PACKED BIT(20) 97 #define SPI_RX_TRIG_MASK (0x3 << 18) 98 #define SPI_RX_TRIG_1W (0x0 << 18) 99 #define SPI_RX_TRIG_4W (0x1 << 18) 100 #define SPI_TX_TRIG_MASK (0x3 << 16) 101 #define SPI_TX_TRIG_1W (0x0 << 16) 102 #define SPI_TX_TRIG_4W (0x1 << 16) 103 #define SPI_DMA_BLK_COUNT(count) (((count) - 1) & 0xFFFF); 104 105 #define SPI_TX_FIFO 0x10 106 #define SPI_RX_FIFO 0x20 107 108 #define DATA_DIR_TX (1 << 0) 109 #define DATA_DIR_RX (1 << 1) 110 111 #define MAX_CHIP_SELECT 4 112 #define SPI_FIFO_DEPTH 4 113 #define SPI_DMA_TIMEOUT (msecs_to_jiffies(1000)) 114 115 struct tegra_sflash_data { 116 struct device *dev; 117 struct spi_master *master; 118 spinlock_t lock; 119 120 struct clk *clk; 121 void __iomem *base; 122 unsigned irq; 123 u32 spi_max_frequency; 124 u32 cur_speed; 125 126 struct spi_device *cur_spi; 127 unsigned cur_pos; 128 unsigned cur_len; 129 unsigned bytes_per_word; 130 unsigned cur_direction; 131 unsigned curr_xfer_words; 132 133 unsigned cur_rx_pos; 134 unsigned cur_tx_pos; 135 136 u32 tx_status; 137 u32 rx_status; 138 u32 status_reg; 139 140 u32 def_command_reg; 141 u32 command_reg; 142 u32 dma_control_reg; 143 144 struct completion xfer_completion; 145 struct spi_transfer *curr_xfer; 146 }; 147 148 static int tegra_sflash_runtime_suspend(struct device *dev); 149 static int tegra_sflash_runtime_resume(struct device *dev); 150 151 static inline unsigned long tegra_sflash_readl(struct tegra_sflash_data *tsd, 152 unsigned long reg) 153 { 154 return readl(tsd->base + reg); 155 } 156 157 static inline void tegra_sflash_writel(struct tegra_sflash_data *tsd, 158 unsigned long val, unsigned long reg) 159 { 160 writel(val, tsd->base + reg); 161 } 162 163 static void tegra_sflash_clear_status(struct tegra_sflash_data *tsd) 164 { 165 /* Write 1 to clear status register */ 166 tegra_sflash_writel(tsd, SPI_RDY | SPI_FIFO_ERROR, SPI_STATUS); 167 } 168 169 static unsigned tegra_sflash_calculate_curr_xfer_param( 170 struct spi_device *spi, struct tegra_sflash_data *tsd, 171 struct spi_transfer *t) 172 { 173 unsigned remain_len = t->len - tsd->cur_pos; 174 unsigned max_word; 175 176 tsd->bytes_per_word = (t->bits_per_word - 1) / 8 + 1; 177 max_word = remain_len / tsd->bytes_per_word; 178 if (max_word > SPI_FIFO_DEPTH) 179 max_word = SPI_FIFO_DEPTH; 180 tsd->curr_xfer_words = max_word; 181 return max_word; 182 } 183 184 static unsigned tegra_sflash_fill_tx_fifo_from_client_txbuf( 185 struct tegra_sflash_data *tsd, struct spi_transfer *t) 186 { 187 unsigned nbytes; 188 unsigned long status; 189 unsigned max_n_32bit = tsd->curr_xfer_words; 190 u8 *tx_buf = (u8 *)t->tx_buf + tsd->cur_tx_pos; 191 192 if (max_n_32bit > SPI_FIFO_DEPTH) 193 max_n_32bit = SPI_FIFO_DEPTH; 194 nbytes = max_n_32bit * tsd->bytes_per_word; 195 196 status = tegra_sflash_readl(tsd, SPI_STATUS); 197 while (!(status & SPI_TXF_FULL)) { 198 int i; 199 unsigned int x = 0; 200 201 for (i = 0; nbytes && (i < tsd->bytes_per_word); 202 i++, nbytes--) 203 x |= ((*tx_buf++) << i*8); 204 tegra_sflash_writel(tsd, x, SPI_TX_FIFO); 205 if (!nbytes) 206 break; 207 208 status = tegra_sflash_readl(tsd, SPI_STATUS); 209 } 210 tsd->cur_tx_pos += max_n_32bit * tsd->bytes_per_word; 211 return max_n_32bit; 212 } 213 214 static int tegra_sflash_read_rx_fifo_to_client_rxbuf( 215 struct tegra_sflash_data *tsd, struct spi_transfer *t) 216 { 217 unsigned long status; 218 unsigned int read_words = 0; 219 u8 *rx_buf = (u8 *)t->rx_buf + tsd->cur_rx_pos; 220 221 status = tegra_sflash_readl(tsd, SPI_STATUS); 222 while (!(status & SPI_RXF_EMPTY)) { 223 int i; 224 unsigned long x; 225 226 x = tegra_sflash_readl(tsd, SPI_RX_FIFO); 227 for (i = 0; (i < tsd->bytes_per_word); i++) 228 *rx_buf++ = (x >> (i*8)) & 0xFF; 229 read_words++; 230 status = tegra_sflash_readl(tsd, SPI_STATUS); 231 } 232 tsd->cur_rx_pos += read_words * tsd->bytes_per_word; 233 return 0; 234 } 235 236 static int tegra_sflash_start_cpu_based_transfer( 237 struct tegra_sflash_data *tsd, struct spi_transfer *t) 238 { 239 unsigned long val = 0; 240 unsigned cur_words; 241 242 if (tsd->cur_direction & DATA_DIR_TX) 243 val |= SPI_IE_TXC; 244 245 if (tsd->cur_direction & DATA_DIR_RX) 246 val |= SPI_IE_RXC; 247 248 tegra_sflash_writel(tsd, val, SPI_DMA_CTL); 249 tsd->dma_control_reg = val; 250 251 if (tsd->cur_direction & DATA_DIR_TX) 252 cur_words = tegra_sflash_fill_tx_fifo_from_client_txbuf(tsd, t); 253 else 254 cur_words = tsd->curr_xfer_words; 255 val |= SPI_DMA_BLK_COUNT(cur_words); 256 tegra_sflash_writel(tsd, val, SPI_DMA_CTL); 257 tsd->dma_control_reg = val; 258 val |= SPI_DMA_EN; 259 tegra_sflash_writel(tsd, val, SPI_DMA_CTL); 260 return 0; 261 } 262 263 static int tegra_sflash_start_transfer_one(struct spi_device *spi, 264 struct spi_transfer *t, bool is_first_of_msg, 265 bool is_single_xfer) 266 { 267 struct tegra_sflash_data *tsd = spi_master_get_devdata(spi->master); 268 u32 speed; 269 unsigned long command; 270 271 speed = t->speed_hz; 272 if (speed != tsd->cur_speed) { 273 clk_set_rate(tsd->clk, speed); 274 tsd->cur_speed = speed; 275 } 276 277 tsd->cur_spi = spi; 278 tsd->cur_pos = 0; 279 tsd->cur_rx_pos = 0; 280 tsd->cur_tx_pos = 0; 281 tsd->curr_xfer = t; 282 tegra_sflash_calculate_curr_xfer_param(spi, tsd, t); 283 if (is_first_of_msg) { 284 command = tsd->def_command_reg; 285 command |= SPI_BIT_LENGTH(t->bits_per_word - 1); 286 command |= SPI_CS_VAL_HIGH; 287 288 command &= ~SPI_MODES; 289 if (spi->mode & SPI_CPHA) 290 command |= SPI_CK_SDA_FALLING; 291 292 if (spi->mode & SPI_CPOL) 293 command |= SPI_ACTIVE_SCLK_DRIVE_HIGH; 294 else 295 command |= SPI_ACTIVE_SCLK_DRIVE_LOW; 296 command |= SPI_CS0_EN << spi->chip_select; 297 } else { 298 command = tsd->command_reg; 299 command &= ~SPI_BIT_LENGTH(~0); 300 command |= SPI_BIT_LENGTH(t->bits_per_word - 1); 301 command &= ~(SPI_RX_EN | SPI_TX_EN); 302 } 303 304 tsd->cur_direction = 0; 305 if (t->rx_buf) { 306 command |= SPI_RX_EN; 307 tsd->cur_direction |= DATA_DIR_RX; 308 } 309 if (t->tx_buf) { 310 command |= SPI_TX_EN; 311 tsd->cur_direction |= DATA_DIR_TX; 312 } 313 tegra_sflash_writel(tsd, command, SPI_COMMAND); 314 tsd->command_reg = command; 315 316 return tegra_sflash_start_cpu_based_transfer(tsd, t); 317 } 318 319 static int tegra_sflash_setup(struct spi_device *spi) 320 { 321 struct tegra_sflash_data *tsd = spi_master_get_devdata(spi->master); 322 323 /* Set speed to the spi max fequency if spi device has not set */ 324 spi->max_speed_hz = spi->max_speed_hz ? : tsd->spi_max_frequency; 325 return 0; 326 } 327 328 static int tegra_sflash_transfer_one_message(struct spi_master *master, 329 struct spi_message *msg) 330 { 331 bool is_first_msg = true; 332 int single_xfer; 333 struct tegra_sflash_data *tsd = spi_master_get_devdata(master); 334 struct spi_transfer *xfer; 335 struct spi_device *spi = msg->spi; 336 int ret; 337 338 msg->status = 0; 339 msg->actual_length = 0; 340 single_xfer = list_is_singular(&msg->transfers); 341 list_for_each_entry(xfer, &msg->transfers, transfer_list) { 342 INIT_COMPLETION(tsd->xfer_completion); 343 ret = tegra_sflash_start_transfer_one(spi, xfer, 344 is_first_msg, single_xfer); 345 if (ret < 0) { 346 dev_err(tsd->dev, 347 "spi can not start transfer, err %d\n", ret); 348 goto exit; 349 } 350 is_first_msg = false; 351 ret = wait_for_completion_timeout(&tsd->xfer_completion, 352 SPI_DMA_TIMEOUT); 353 if (WARN_ON(ret == 0)) { 354 dev_err(tsd->dev, 355 "spi trasfer timeout, err %d\n", ret); 356 ret = -EIO; 357 goto exit; 358 } 359 360 if (tsd->tx_status || tsd->rx_status) { 361 dev_err(tsd->dev, "Error in Transfer\n"); 362 ret = -EIO; 363 goto exit; 364 } 365 msg->actual_length += xfer->len; 366 if (xfer->cs_change && xfer->delay_usecs) { 367 tegra_sflash_writel(tsd, tsd->def_command_reg, 368 SPI_COMMAND); 369 udelay(xfer->delay_usecs); 370 } 371 } 372 ret = 0; 373 exit: 374 tegra_sflash_writel(tsd, tsd->def_command_reg, SPI_COMMAND); 375 msg->status = ret; 376 spi_finalize_current_message(master); 377 return ret; 378 } 379 380 static irqreturn_t handle_cpu_based_xfer(struct tegra_sflash_data *tsd) 381 { 382 struct spi_transfer *t = tsd->curr_xfer; 383 unsigned long flags; 384 385 spin_lock_irqsave(&tsd->lock, flags); 386 if (tsd->tx_status || tsd->rx_status || (tsd->status_reg & SPI_BSY)) { 387 dev_err(tsd->dev, 388 "CpuXfer ERROR bit set 0x%x\n", tsd->status_reg); 389 dev_err(tsd->dev, 390 "CpuXfer 0x%08x:0x%08x\n", tsd->command_reg, 391 tsd->dma_control_reg); 392 tegra_periph_reset_assert(tsd->clk); 393 udelay(2); 394 tegra_periph_reset_deassert(tsd->clk); 395 complete(&tsd->xfer_completion); 396 goto exit; 397 } 398 399 if (tsd->cur_direction & DATA_DIR_RX) 400 tegra_sflash_read_rx_fifo_to_client_rxbuf(tsd, t); 401 402 if (tsd->cur_direction & DATA_DIR_TX) 403 tsd->cur_pos = tsd->cur_tx_pos; 404 else 405 tsd->cur_pos = tsd->cur_rx_pos; 406 407 if (tsd->cur_pos == t->len) { 408 complete(&tsd->xfer_completion); 409 goto exit; 410 } 411 412 tegra_sflash_calculate_curr_xfer_param(tsd->cur_spi, tsd, t); 413 tegra_sflash_start_cpu_based_transfer(tsd, t); 414 exit: 415 spin_unlock_irqrestore(&tsd->lock, flags); 416 return IRQ_HANDLED; 417 } 418 419 static irqreturn_t tegra_sflash_isr(int irq, void *context_data) 420 { 421 struct tegra_sflash_data *tsd = context_data; 422 423 tsd->status_reg = tegra_sflash_readl(tsd, SPI_STATUS); 424 if (tsd->cur_direction & DATA_DIR_TX) 425 tsd->tx_status = tsd->status_reg & SPI_TX_OVF; 426 427 if (tsd->cur_direction & DATA_DIR_RX) 428 tsd->rx_status = tsd->status_reg & SPI_RX_UNF; 429 tegra_sflash_clear_status(tsd); 430 431 return handle_cpu_based_xfer(tsd); 432 } 433 434 static void tegra_sflash_parse_dt(struct tegra_sflash_data *tsd) 435 { 436 struct device_node *np = tsd->dev->of_node; 437 438 if (of_property_read_u32(np, "spi-max-frequency", 439 &tsd->spi_max_frequency)) 440 tsd->spi_max_frequency = 25000000; /* 25MHz */ 441 } 442 443 static struct of_device_id tegra_sflash_of_match[] = { 444 { .compatible = "nvidia,tegra20-sflash", }, 445 {} 446 }; 447 MODULE_DEVICE_TABLE(of, tegra_sflash_of_match); 448 449 static int tegra_sflash_probe(struct platform_device *pdev) 450 { 451 struct spi_master *master; 452 struct tegra_sflash_data *tsd; 453 struct resource *r; 454 int ret; 455 const struct of_device_id *match; 456 457 match = of_match_device(tegra_sflash_of_match, &pdev->dev); 458 if (!match) { 459 dev_err(&pdev->dev, "Error: No device match found\n"); 460 return -ENODEV; 461 } 462 463 master = spi_alloc_master(&pdev->dev, sizeof(*tsd)); 464 if (!master) { 465 dev_err(&pdev->dev, "master allocation failed\n"); 466 return -ENOMEM; 467 } 468 469 /* the spi->mode bits understood by this driver: */ 470 master->mode_bits = SPI_CPOL | SPI_CPHA; 471 master->setup = tegra_sflash_setup; 472 master->transfer_one_message = tegra_sflash_transfer_one_message; 473 master->auto_runtime_pm = true; 474 master->num_chipselect = MAX_CHIP_SELECT; 475 master->bus_num = -1; 476 477 platform_set_drvdata(pdev, master); 478 tsd = spi_master_get_devdata(master); 479 tsd->master = master; 480 tsd->dev = &pdev->dev; 481 spin_lock_init(&tsd->lock); 482 483 tegra_sflash_parse_dt(tsd); 484 485 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 486 tsd->base = devm_ioremap_resource(&pdev->dev, r); 487 if (IS_ERR(tsd->base)) { 488 ret = PTR_ERR(tsd->base); 489 goto exit_free_master; 490 } 491 492 tsd->irq = platform_get_irq(pdev, 0); 493 ret = request_irq(tsd->irq, tegra_sflash_isr, 0, 494 dev_name(&pdev->dev), tsd); 495 if (ret < 0) { 496 dev_err(&pdev->dev, "Failed to register ISR for IRQ %d\n", 497 tsd->irq); 498 goto exit_free_master; 499 } 500 501 tsd->clk = devm_clk_get(&pdev->dev, NULL); 502 if (IS_ERR(tsd->clk)) { 503 dev_err(&pdev->dev, "can not get clock\n"); 504 ret = PTR_ERR(tsd->clk); 505 goto exit_free_irq; 506 } 507 508 init_completion(&tsd->xfer_completion); 509 pm_runtime_enable(&pdev->dev); 510 if (!pm_runtime_enabled(&pdev->dev)) { 511 ret = tegra_sflash_runtime_resume(&pdev->dev); 512 if (ret) 513 goto exit_pm_disable; 514 } 515 516 ret = pm_runtime_get_sync(&pdev->dev); 517 if (ret < 0) { 518 dev_err(&pdev->dev, "pm runtime get failed, e = %d\n", ret); 519 goto exit_pm_disable; 520 } 521 522 /* Reset controller */ 523 tegra_periph_reset_assert(tsd->clk); 524 udelay(2); 525 tegra_periph_reset_deassert(tsd->clk); 526 527 tsd->def_command_reg = SPI_M_S | SPI_CS_SW; 528 tegra_sflash_writel(tsd, tsd->def_command_reg, SPI_COMMAND); 529 pm_runtime_put(&pdev->dev); 530 531 master->dev.of_node = pdev->dev.of_node; 532 ret = spi_register_master(master); 533 if (ret < 0) { 534 dev_err(&pdev->dev, "can not register to master err %d\n", ret); 535 goto exit_pm_disable; 536 } 537 return ret; 538 539 exit_pm_disable: 540 pm_runtime_disable(&pdev->dev); 541 if (!pm_runtime_status_suspended(&pdev->dev)) 542 tegra_sflash_runtime_suspend(&pdev->dev); 543 exit_free_irq: 544 free_irq(tsd->irq, tsd); 545 exit_free_master: 546 spi_master_put(master); 547 return ret; 548 } 549 550 static int tegra_sflash_remove(struct platform_device *pdev) 551 { 552 struct spi_master *master = platform_get_drvdata(pdev); 553 struct tegra_sflash_data *tsd = spi_master_get_devdata(master); 554 555 free_irq(tsd->irq, tsd); 556 spi_unregister_master(master); 557 558 pm_runtime_disable(&pdev->dev); 559 if (!pm_runtime_status_suspended(&pdev->dev)) 560 tegra_sflash_runtime_suspend(&pdev->dev); 561 562 return 0; 563 } 564 565 #ifdef CONFIG_PM_SLEEP 566 static int tegra_sflash_suspend(struct device *dev) 567 { 568 struct spi_master *master = dev_get_drvdata(dev); 569 570 return spi_master_suspend(master); 571 } 572 573 static int tegra_sflash_resume(struct device *dev) 574 { 575 struct spi_master *master = dev_get_drvdata(dev); 576 struct tegra_sflash_data *tsd = spi_master_get_devdata(master); 577 int ret; 578 579 ret = pm_runtime_get_sync(dev); 580 if (ret < 0) { 581 dev_err(dev, "pm runtime failed, e = %d\n", ret); 582 return ret; 583 } 584 tegra_sflash_writel(tsd, tsd->command_reg, SPI_COMMAND); 585 pm_runtime_put(dev); 586 587 return spi_master_resume(master); 588 } 589 #endif 590 591 static int tegra_sflash_runtime_suspend(struct device *dev) 592 { 593 struct spi_master *master = dev_get_drvdata(dev); 594 struct tegra_sflash_data *tsd = spi_master_get_devdata(master); 595 596 /* Flush all write which are in PPSB queue by reading back */ 597 tegra_sflash_readl(tsd, SPI_COMMAND); 598 599 clk_disable_unprepare(tsd->clk); 600 return 0; 601 } 602 603 static int tegra_sflash_runtime_resume(struct device *dev) 604 { 605 struct spi_master *master = dev_get_drvdata(dev); 606 struct tegra_sflash_data *tsd = spi_master_get_devdata(master); 607 int ret; 608 609 ret = clk_prepare_enable(tsd->clk); 610 if (ret < 0) { 611 dev_err(tsd->dev, "clk_prepare failed: %d\n", ret); 612 return ret; 613 } 614 return 0; 615 } 616 617 static const struct dev_pm_ops slink_pm_ops = { 618 SET_RUNTIME_PM_OPS(tegra_sflash_runtime_suspend, 619 tegra_sflash_runtime_resume, NULL) 620 SET_SYSTEM_SLEEP_PM_OPS(tegra_sflash_suspend, tegra_sflash_resume) 621 }; 622 static struct platform_driver tegra_sflash_driver = { 623 .driver = { 624 .name = "spi-tegra-sflash", 625 .owner = THIS_MODULE, 626 .pm = &slink_pm_ops, 627 .of_match_table = tegra_sflash_of_match, 628 }, 629 .probe = tegra_sflash_probe, 630 .remove = tegra_sflash_remove, 631 }; 632 module_platform_driver(tegra_sflash_driver); 633 634 MODULE_ALIAS("platform:spi-tegra-sflash"); 635 MODULE_DESCRIPTION("NVIDIA Tegra20 Serial Flash Controller Driver"); 636 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 637 MODULE_LICENSE("GPL v2"); 638