1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Driver For Marvell Two-channel DMA Engine
5 * Copyright: Marvell International Ltd.
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/types.h>
12 #include <linux/interrupt.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/slab.h>
15 #include <linux/dmaengine.h>
16 #include <linux/platform_device.h>
17 #include <linux/device.h>
18 #include <linux/platform_data/dma-mmp_tdma.h>
19 #include <linux/of_device.h>
20 #include <linux/of_dma.h>
22 #include "dmaengine.h"
25 * Two-Channel DMA registers
27 #define TDBCR 0x00 /* Byte Count */
28 #define TDSAR 0x10 /* Src Addr */
29 #define TDDAR 0x20 /* Dst Addr */
30 #define TDNDPR 0x30 /* Next Desc */
31 #define TDCR 0x40 /* Control */
32 #define TDCP 0x60 /* Priority*/
33 #define TDCDPR 0x70 /* Current Desc */
34 #define TDIMR 0x80 /* Int Mask */
35 #define TDISR 0xa0 /* Int Status */
37 /* Two-Channel DMA Control Register */
38 #define TDCR_SSZ_8_BITS (0x0 << 22) /* Sample Size */
39 #define TDCR_SSZ_12_BITS (0x1 << 22)
40 #define TDCR_SSZ_16_BITS (0x2 << 22)
41 #define TDCR_SSZ_20_BITS (0x3 << 22)
42 #define TDCR_SSZ_24_BITS (0x4 << 22)
43 #define TDCR_SSZ_32_BITS (0x5 << 22)
44 #define TDCR_SSZ_SHIFT (0x1 << 22)
45 #define TDCR_SSZ_MASK (0x7 << 22)
46 #define TDCR_SSPMOD (0x1 << 21) /* SSP MOD */
47 #define TDCR_ABR (0x1 << 20) /* Channel Abort */
48 #define TDCR_CDE (0x1 << 17) /* Close Desc Enable */
49 #define TDCR_PACKMOD (0x1 << 16) /* Pack Mode (ADMA Only) */
50 #define TDCR_CHANACT (0x1 << 14) /* Channel Active */
51 #define TDCR_FETCHND (0x1 << 13) /* Fetch Next Desc */
52 #define TDCR_CHANEN (0x1 << 12) /* Channel Enable */
53 #define TDCR_INTMODE (0x1 << 10) /* Interrupt Mode */
54 #define TDCR_CHAINMOD (0x1 << 9) /* Chain Mode */
55 #define TDCR_BURSTSZ_MSK (0x7 << 6) /* Burst Size */
56 #define TDCR_BURSTSZ_4B (0x0 << 6)
57 #define TDCR_BURSTSZ_8B (0x1 << 6)
58 #define TDCR_BURSTSZ_16B (0x3 << 6)
59 #define TDCR_BURSTSZ_32B (0x6 << 6)
60 #define TDCR_BURSTSZ_64B (0x7 << 6)
61 #define TDCR_BURSTSZ_SQU_1B (0x5 << 6)
62 #define TDCR_BURSTSZ_SQU_2B (0x6 << 6)
63 #define TDCR_BURSTSZ_SQU_4B (0x0 << 6)
64 #define TDCR_BURSTSZ_SQU_8B (0x1 << 6)
65 #define TDCR_BURSTSZ_SQU_16B (0x3 << 6)
66 #define TDCR_BURSTSZ_SQU_32B (0x7 << 6)
67 #define TDCR_BURSTSZ_128B (0x5 << 6)
68 #define TDCR_DSTDIR_MSK (0x3 << 4) /* Dst Direction */
69 #define TDCR_DSTDIR_ADDR_HOLD (0x2 << 4) /* Dst Addr Hold */
70 #define TDCR_DSTDIR_ADDR_INC (0x0 << 4) /* Dst Addr Increment */
71 #define TDCR_SRCDIR_MSK (0x3 << 2) /* Src Direction */
72 #define TDCR_SRCDIR_ADDR_HOLD (0x2 << 2) /* Src Addr Hold */
73 #define TDCR_SRCDIR_ADDR_INC (0x0 << 2) /* Src Addr Increment */
74 #define TDCR_DSTDESCCONT (0x1 << 1)
75 #define TDCR_SRCDESTCONT (0x1 << 0)
77 /* Two-Channel DMA Int Mask Register */
78 #define TDIMR_COMP (0x1 << 0)
80 /* Two-Channel DMA Int Status Register */
81 #define TDISR_COMP (0x1 << 0)
84 * Two-Channel DMA Descriptor Struct
85 * NOTE: desc's buf must be aligned to 16 bytes.
87 struct mmp_tdma_desc {
99 #define TDMA_MAX_XFER_BYTES SZ_64K
101 struct mmp_tdma_chan {
103 struct dma_chan chan;
104 struct dma_async_tx_descriptor desc;
105 struct tasklet_struct tasklet;
107 struct mmp_tdma_desc *desc_arr;
108 dma_addr_t desc_arr_phys;
110 enum dma_transfer_direction dir;
113 enum dma_slave_buswidth buswidth;
114 enum dma_status status;
115 struct dma_slave_config slave_config;
118 enum mmp_tdma_type type;
120 void __iomem *reg_base;
126 struct gen_pool *pool;
129 #define TDMA_CHANNEL_NUM 2
130 struct mmp_tdma_device {
133 struct dma_device device;
134 struct mmp_tdma_chan *tdmac[TDMA_CHANNEL_NUM];
137 #define to_mmp_tdma_chan(dchan) container_of(dchan, struct mmp_tdma_chan, chan)
139 static int mmp_tdma_config_write(struct dma_chan *chan,
140 enum dma_transfer_direction dir,
141 struct dma_slave_config *dmaengine_cfg);
143 static void mmp_tdma_chan_set_desc(struct mmp_tdma_chan *tdmac, dma_addr_t phys)
145 writel(phys, tdmac->reg_base + TDNDPR);
146 writel(readl(tdmac->reg_base + TDCR) | TDCR_FETCHND,
147 tdmac->reg_base + TDCR);
150 static void mmp_tdma_enable_irq(struct mmp_tdma_chan *tdmac, bool enable)
153 writel(TDIMR_COMP, tdmac->reg_base + TDIMR);
155 writel(0, tdmac->reg_base + TDIMR);
158 static void mmp_tdma_enable_chan(struct mmp_tdma_chan *tdmac)
160 /* enable dma chan */
161 writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
162 tdmac->reg_base + TDCR);
163 tdmac->status = DMA_IN_PROGRESS;
166 static int mmp_tdma_disable_chan(struct dma_chan *chan)
168 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
171 tdcr = readl(tdmac->reg_base + TDCR);
173 tdcr &= ~TDCR_CHANEN;
174 writel(tdcr, tdmac->reg_base + TDCR);
176 tdmac->status = DMA_COMPLETE;
181 static int mmp_tdma_resume_chan(struct dma_chan *chan)
183 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
185 writel(readl(tdmac->reg_base + TDCR) | TDCR_CHANEN,
186 tdmac->reg_base + TDCR);
187 tdmac->status = DMA_IN_PROGRESS;
192 static int mmp_tdma_pause_chan(struct dma_chan *chan)
194 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
196 writel(readl(tdmac->reg_base + TDCR) & ~TDCR_CHANEN,
197 tdmac->reg_base + TDCR);
198 tdmac->status = DMA_PAUSED;
203 static int mmp_tdma_config_chan(struct dma_chan *chan)
205 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
206 unsigned int tdcr = 0;
208 mmp_tdma_disable_chan(chan);
210 if (tdmac->dir == DMA_MEM_TO_DEV)
211 tdcr = TDCR_DSTDIR_ADDR_HOLD | TDCR_SRCDIR_ADDR_INC;
212 else if (tdmac->dir == DMA_DEV_TO_MEM)
213 tdcr = TDCR_SRCDIR_ADDR_HOLD | TDCR_DSTDIR_ADDR_INC;
215 if (tdmac->type == MMP_AUD_TDMA) {
216 tdcr |= TDCR_PACKMOD;
218 switch (tdmac->burst_sz) {
220 tdcr |= TDCR_BURSTSZ_4B;
223 tdcr |= TDCR_BURSTSZ_8B;
226 tdcr |= TDCR_BURSTSZ_16B;
229 tdcr |= TDCR_BURSTSZ_32B;
232 tdcr |= TDCR_BURSTSZ_64B;
235 tdcr |= TDCR_BURSTSZ_128B;
238 dev_err(tdmac->dev, "unknown burst size.\n");
242 switch (tdmac->buswidth) {
243 case DMA_SLAVE_BUSWIDTH_1_BYTE:
244 tdcr |= TDCR_SSZ_8_BITS;
246 case DMA_SLAVE_BUSWIDTH_2_BYTES:
247 tdcr |= TDCR_SSZ_16_BITS;
249 case DMA_SLAVE_BUSWIDTH_4_BYTES:
250 tdcr |= TDCR_SSZ_32_BITS;
253 dev_err(tdmac->dev, "unknown bus size.\n");
256 } else if (tdmac->type == PXA910_SQU) {
259 switch (tdmac->burst_sz) {
261 tdcr |= TDCR_BURSTSZ_SQU_1B;
264 tdcr |= TDCR_BURSTSZ_SQU_2B;
267 tdcr |= TDCR_BURSTSZ_SQU_4B;
270 tdcr |= TDCR_BURSTSZ_SQU_8B;
273 tdcr |= TDCR_BURSTSZ_SQU_16B;
276 tdcr |= TDCR_BURSTSZ_SQU_32B;
279 dev_err(tdmac->dev, "unknown burst size.\n");
284 writel(tdcr, tdmac->reg_base + TDCR);
288 static int mmp_tdma_clear_chan_irq(struct mmp_tdma_chan *tdmac)
290 u32 reg = readl(tdmac->reg_base + TDISR);
292 if (reg & TDISR_COMP) {
295 writel(reg, tdmac->reg_base + TDISR);
302 static size_t mmp_tdma_get_pos(struct mmp_tdma_chan *tdmac)
306 if (tdmac->idx == 0) {
307 reg = __raw_readl(tdmac->reg_base + TDSAR);
308 reg -= tdmac->desc_arr[0].src_addr;
309 } else if (tdmac->idx == 1) {
310 reg = __raw_readl(tdmac->reg_base + TDDAR);
311 reg -= tdmac->desc_arr[0].dst_addr;
318 static irqreturn_t mmp_tdma_chan_handler(int irq, void *dev_id)
320 struct mmp_tdma_chan *tdmac = dev_id;
322 if (mmp_tdma_clear_chan_irq(tdmac) == 0) {
323 tasklet_schedule(&tdmac->tasklet);
329 static irqreturn_t mmp_tdma_int_handler(int irq, void *dev_id)
331 struct mmp_tdma_device *tdev = dev_id;
335 for (i = 0; i < TDMA_CHANNEL_NUM; i++) {
336 struct mmp_tdma_chan *tdmac = tdev->tdmac[i];
338 ret = mmp_tdma_chan_handler(irq, tdmac);
339 if (ret == IRQ_HANDLED)
349 static void dma_do_tasklet(struct tasklet_struct *t)
351 struct mmp_tdma_chan *tdmac = from_tasklet(tdmac, t, tasklet);
353 dmaengine_desc_get_callback_invoke(&tdmac->desc, NULL);
356 static void mmp_tdma_free_descriptor(struct mmp_tdma_chan *tdmac)
358 struct gen_pool *gpool;
359 int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
362 if (gpool && tdmac->desc_arr)
363 gen_pool_free(gpool, (unsigned long)tdmac->desc_arr,
365 tdmac->desc_arr = NULL;
366 if (tdmac->status == DMA_ERROR)
367 tdmac->status = DMA_COMPLETE;
372 static dma_cookie_t mmp_tdma_tx_submit(struct dma_async_tx_descriptor *tx)
374 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(tx->chan);
376 mmp_tdma_chan_set_desc(tdmac, tdmac->desc_arr_phys);
381 static int mmp_tdma_alloc_chan_resources(struct dma_chan *chan)
383 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
386 dma_async_tx_descriptor_init(&tdmac->desc, chan);
387 tdmac->desc.tx_submit = mmp_tdma_tx_submit;
390 ret = devm_request_irq(tdmac->dev, tdmac->irq,
391 mmp_tdma_chan_handler, 0, "tdma", tdmac);
398 static void mmp_tdma_free_chan_resources(struct dma_chan *chan)
400 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
403 devm_free_irq(tdmac->dev, tdmac->irq, tdmac);
404 mmp_tdma_free_descriptor(tdmac);
408 static struct mmp_tdma_desc *mmp_tdma_alloc_descriptor(struct mmp_tdma_chan *tdmac)
410 struct gen_pool *gpool;
411 int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
417 tdmac->desc_arr = gen_pool_dma_alloc(gpool, size, &tdmac->desc_arr_phys);
419 return tdmac->desc_arr;
422 static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
423 struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
424 size_t period_len, enum dma_transfer_direction direction,
427 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
428 struct mmp_tdma_desc *desc;
429 int num_periods = buf_len / period_len;
432 if (!is_slave_direction(direction)) {
433 dev_err(tdmac->dev, "unsupported transfer direction\n");
437 if (tdmac->status != DMA_COMPLETE) {
438 dev_err(tdmac->dev, "controller busy");
442 if (period_len > TDMA_MAX_XFER_BYTES) {
444 "maximum period size exceeded: %zu > %d\n",
445 period_len, TDMA_MAX_XFER_BYTES);
449 tdmac->status = DMA_IN_PROGRESS;
450 tdmac->desc_num = num_periods;
451 desc = mmp_tdma_alloc_descriptor(tdmac);
455 if (mmp_tdma_config_write(chan, direction, &tdmac->slave_config))
458 while (buf < buf_len) {
459 desc = &tdmac->desc_arr[i];
461 if (i + 1 == num_periods)
462 desc->nxt_desc = tdmac->desc_arr_phys;
464 desc->nxt_desc = tdmac->desc_arr_phys +
465 sizeof(*desc) * (i + 1);
467 if (direction == DMA_MEM_TO_DEV) {
468 desc->src_addr = dma_addr;
469 desc->dst_addr = tdmac->dev_addr;
471 desc->src_addr = tdmac->dev_addr;
472 desc->dst_addr = dma_addr;
474 desc->byte_cnt = period_len;
475 dma_addr += period_len;
480 /* enable interrupt */
481 if (flags & DMA_PREP_INTERRUPT)
482 mmp_tdma_enable_irq(tdmac, true);
484 tdmac->buf_len = buf_len;
485 tdmac->period_len = period_len;
491 tdmac->status = DMA_ERROR;
495 static int mmp_tdma_terminate_all(struct dma_chan *chan)
497 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
499 mmp_tdma_disable_chan(chan);
500 /* disable interrupt */
501 mmp_tdma_enable_irq(tdmac, false);
506 static int mmp_tdma_config(struct dma_chan *chan,
507 struct dma_slave_config *dmaengine_cfg)
509 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
511 memcpy(&tdmac->slave_config, dmaengine_cfg, sizeof(*dmaengine_cfg));
516 static int mmp_tdma_config_write(struct dma_chan *chan,
517 enum dma_transfer_direction dir,
518 struct dma_slave_config *dmaengine_cfg)
520 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
522 if (dir == DMA_DEV_TO_MEM) {
523 tdmac->dev_addr = dmaengine_cfg->src_addr;
524 tdmac->burst_sz = dmaengine_cfg->src_maxburst;
525 tdmac->buswidth = dmaengine_cfg->src_addr_width;
527 tdmac->dev_addr = dmaengine_cfg->dst_addr;
528 tdmac->burst_sz = dmaengine_cfg->dst_maxburst;
529 tdmac->buswidth = dmaengine_cfg->dst_addr_width;
533 return mmp_tdma_config_chan(chan);
536 static enum dma_status mmp_tdma_tx_status(struct dma_chan *chan,
537 dma_cookie_t cookie, struct dma_tx_state *txstate)
539 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
541 tdmac->pos = mmp_tdma_get_pos(tdmac);
542 dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie,
543 tdmac->buf_len - tdmac->pos);
545 return tdmac->status;
548 static void mmp_tdma_issue_pending(struct dma_chan *chan)
550 struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
552 mmp_tdma_enable_chan(tdmac);
555 static int mmp_tdma_remove(struct platform_device *pdev)
557 if (pdev->dev.of_node)
558 of_dma_controller_free(pdev->dev.of_node);
563 static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
565 int type, struct gen_pool *pool)
567 struct mmp_tdma_chan *tdmac;
569 if (idx >= TDMA_CHANNEL_NUM) {
570 dev_err(tdev->dev, "too many channels for device!\n");
575 tdmac = devm_kzalloc(tdev->dev, sizeof(*tdmac), GFP_KERNEL);
581 tdmac->dev = tdev->dev;
582 tdmac->chan.device = &tdev->device;
585 tdmac->reg_base = tdev->base + idx * 4;
587 tdmac->status = DMA_COMPLETE;
588 tdev->tdmac[tdmac->idx] = tdmac;
589 tasklet_setup(&tdmac->tasklet, dma_do_tasklet);
591 /* add the channel to tdma_chan list */
592 list_add_tail(&tdmac->chan.device_node,
593 &tdev->device.channels);
597 struct mmp_tdma_filter_param {
598 unsigned int chan_id;
601 static bool mmp_tdma_filter_fn(struct dma_chan *chan, void *fn_param)
603 struct mmp_tdma_filter_param *param = fn_param;
605 if (chan->chan_id != param->chan_id)
611 static struct dma_chan *mmp_tdma_xlate(struct of_phandle_args *dma_spec,
612 struct of_dma *ofdma)
614 struct mmp_tdma_device *tdev = ofdma->of_dma_data;
615 dma_cap_mask_t mask = tdev->device.cap_mask;
616 struct mmp_tdma_filter_param param;
618 if (dma_spec->args_count != 1)
621 param.chan_id = dma_spec->args[0];
623 if (param.chan_id >= TDMA_CHANNEL_NUM)
626 return __dma_request_channel(&mask, mmp_tdma_filter_fn, ¶m,
630 static const struct of_device_id mmp_tdma_dt_ids[] = {
631 { .compatible = "marvell,adma-1.0", .data = (void *)MMP_AUD_TDMA},
632 { .compatible = "marvell,pxa910-squ", .data = (void *)PXA910_SQU},
635 MODULE_DEVICE_TABLE(of, mmp_tdma_dt_ids);
637 static int mmp_tdma_probe(struct platform_device *pdev)
639 enum mmp_tdma_type type;
640 const struct of_device_id *of_id;
641 struct mmp_tdma_device *tdev;
642 struct resource *iores;
644 int irq = 0, irq_num = 0;
645 int chan_num = TDMA_CHANNEL_NUM;
646 struct gen_pool *pool = NULL;
648 of_id = of_match_device(mmp_tdma_dt_ids, &pdev->dev);
650 type = (enum mmp_tdma_type) of_id->data;
652 type = platform_get_device_id(pdev)->driver_data;
654 /* always have couple channels */
655 tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
659 tdev->dev = &pdev->dev;
661 for (i = 0; i < chan_num; i++) {
662 if (platform_get_irq(pdev, i) > 0)
666 iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
667 tdev->base = devm_ioremap_resource(&pdev->dev, iores);
668 if (IS_ERR(tdev->base))
669 return PTR_ERR(tdev->base);
671 INIT_LIST_HEAD(&tdev->device.channels);
673 if (pdev->dev.of_node)
674 pool = of_gen_pool_get(pdev->dev.of_node, "asram", 0);
676 pool = sram_get_gpool("asram");
678 dev_err(&pdev->dev, "asram pool not available\n");
682 if (irq_num != chan_num) {
683 irq = platform_get_irq(pdev, 0);
684 ret = devm_request_irq(&pdev->dev, irq,
685 mmp_tdma_int_handler, IRQF_SHARED, "tdma", tdev);
690 /* initialize channel parameters */
691 for (i = 0; i < chan_num; i++) {
692 irq = (irq_num != chan_num) ? 0 : platform_get_irq(pdev, i);
693 ret = mmp_tdma_chan_init(tdev, i, irq, type, pool);
698 dma_cap_set(DMA_SLAVE, tdev->device.cap_mask);
699 dma_cap_set(DMA_CYCLIC, tdev->device.cap_mask);
700 tdev->device.dev = &pdev->dev;
701 tdev->device.device_alloc_chan_resources =
702 mmp_tdma_alloc_chan_resources;
703 tdev->device.device_free_chan_resources =
704 mmp_tdma_free_chan_resources;
705 tdev->device.device_prep_dma_cyclic = mmp_tdma_prep_dma_cyclic;
706 tdev->device.device_tx_status = mmp_tdma_tx_status;
707 tdev->device.device_issue_pending = mmp_tdma_issue_pending;
708 tdev->device.device_config = mmp_tdma_config;
709 tdev->device.device_pause = mmp_tdma_pause_chan;
710 tdev->device.device_resume = mmp_tdma_resume_chan;
711 tdev->device.device_terminate_all = mmp_tdma_terminate_all;
712 tdev->device.copy_align = DMAENGINE_ALIGN_8_BYTES;
714 tdev->device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
715 if (type == MMP_AUD_TDMA) {
716 tdev->device.max_burst = SZ_128;
717 tdev->device.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
718 tdev->device.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
719 } else if (type == PXA910_SQU) {
720 tdev->device.max_burst = SZ_32;
722 tdev->device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
723 tdev->device.descriptor_reuse = true;
725 dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
726 platform_set_drvdata(pdev, tdev);
728 ret = dmaenginem_async_device_register(&tdev->device);
730 dev_err(tdev->device.dev, "unable to register\n");
734 if (pdev->dev.of_node) {
735 ret = of_dma_controller_register(pdev->dev.of_node,
736 mmp_tdma_xlate, tdev);
738 dev_err(tdev->device.dev,
739 "failed to register controller\n");
744 dev_info(tdev->device.dev, "initialized\n");
748 static const struct platform_device_id mmp_tdma_id_table[] = {
749 { "mmp-adma", MMP_AUD_TDMA },
750 { "pxa910-squ", PXA910_SQU },
754 static struct platform_driver mmp_tdma_driver = {
757 .of_match_table = mmp_tdma_dt_ids,
759 .id_table = mmp_tdma_id_table,
760 .probe = mmp_tdma_probe,
761 .remove = mmp_tdma_remove,
764 module_platform_driver(mmp_tdma_driver);
766 MODULE_LICENSE("GPL");
767 MODULE_DESCRIPTION("MMP Two-Channel DMA Driver");
768 MODULE_ALIAS("platform:mmp-tdma");
769 MODULE_AUTHOR("Leo Yan <leoy@marvell.com>");
770 MODULE_AUTHOR("Zhangfei Gao <zhangfei.gao@marvell.com>");