2 * EDMA3 support for DaVinci
4 * Copyright (C) 2006-2009 Texas Instruments.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include <linux/err.h>
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/interrupt.h>
25 #include <linux/platform_device.h>
27 #include <linux/slab.h>
29 #include <linux/platform_data/edma.h>
31 /* Offsets matching "struct edmacc_param" */
34 #define PARM_A_B_CNT 0x08
36 #define PARM_SRC_DST_BIDX 0x10
37 #define PARM_LINK_BCNTRLD 0x14
38 #define PARM_SRC_DST_CIDX 0x18
39 #define PARM_CCNT 0x1c
41 #define PARM_SIZE 0x20
43 /* Offsets for EDMA CC global channel registers and their shadows */
44 #define SH_ER 0x00 /* 64 bits */
45 #define SH_ECR 0x08 /* 64 bits */
46 #define SH_ESR 0x10 /* 64 bits */
47 #define SH_CER 0x18 /* 64 bits */
48 #define SH_EER 0x20 /* 64 bits */
49 #define SH_EECR 0x28 /* 64 bits */
50 #define SH_EESR 0x30 /* 64 bits */
51 #define SH_SER 0x38 /* 64 bits */
52 #define SH_SECR 0x40 /* 64 bits */
53 #define SH_IER 0x50 /* 64 bits */
54 #define SH_IECR 0x58 /* 64 bits */
55 #define SH_IESR 0x60 /* 64 bits */
56 #define SH_IPR 0x68 /* 64 bits */
57 #define SH_ICR 0x70 /* 64 bits */
67 /* Offsets for EDMA CC global registers */
68 #define EDMA_REV 0x0000
69 #define EDMA_CCCFG 0x0004
70 #define EDMA_QCHMAP 0x0200 /* 8 registers */
71 #define EDMA_DMAQNUM 0x0240 /* 8 registers (4 on OMAP-L1xx) */
72 #define EDMA_QDMAQNUM 0x0260
73 #define EDMA_QUETCMAP 0x0280
74 #define EDMA_QUEPRI 0x0284
75 #define EDMA_EMR 0x0300 /* 64 bits */
76 #define EDMA_EMCR 0x0308 /* 64 bits */
77 #define EDMA_QEMR 0x0310
78 #define EDMA_QEMCR 0x0314
79 #define EDMA_CCERR 0x0318
80 #define EDMA_CCERRCLR 0x031c
81 #define EDMA_EEVAL 0x0320
82 #define EDMA_DRAE 0x0340 /* 4 x 64 bits*/
83 #define EDMA_QRAE 0x0380 /* 4 registers */
84 #define EDMA_QUEEVTENTRY 0x0400 /* 2 x 16 registers */
85 #define EDMA_QSTAT 0x0600 /* 2 registers */
86 #define EDMA_QWMTHRA 0x0620
87 #define EDMA_QWMTHRB 0x0624
88 #define EDMA_CCSTAT 0x0640
90 #define EDMA_M 0x1000 /* global channel registers */
91 #define EDMA_ECR 0x1008
92 #define EDMA_ECRH 0x100C
93 #define EDMA_SHADOW0 0x2000 /* 4 regions shadowing global channels */
94 #define EDMA_PARM 0x4000 /* 128 param entries */
96 #define PARM_OFFSET(param_no) (EDMA_PARM + ((param_no) << 5))
98 #define EDMA_DCHMAP 0x0100 /* 64 registers */
99 #define CHMAP_EXIST BIT(24)
101 #define EDMA_MAX_DMACH 64
102 #define EDMA_MAX_PARAMENTRY 512
104 /*****************************************************************************/
106 static void __iomem *edmacc_regs_base[EDMA_MAX_CC];
108 static inline unsigned int edma_read(unsigned ctlr, int offset)
110 return (unsigned int)__raw_readl(edmacc_regs_base[ctlr] + offset);
113 static inline void edma_write(unsigned ctlr, int offset, int val)
115 __raw_writel(val, edmacc_regs_base[ctlr] + offset);
117 static inline void edma_modify(unsigned ctlr, int offset, unsigned and,
120 unsigned val = edma_read(ctlr, offset);
123 edma_write(ctlr, offset, val);
125 static inline void edma_and(unsigned ctlr, int offset, unsigned and)
127 unsigned val = edma_read(ctlr, offset);
129 edma_write(ctlr, offset, val);
131 static inline void edma_or(unsigned ctlr, int offset, unsigned or)
133 unsigned val = edma_read(ctlr, offset);
135 edma_write(ctlr, offset, val);
137 static inline unsigned int edma_read_array(unsigned ctlr, int offset, int i)
139 return edma_read(ctlr, offset + (i << 2));
141 static inline void edma_write_array(unsigned ctlr, int offset, int i,
144 edma_write(ctlr, offset + (i << 2), val);
146 static inline void edma_modify_array(unsigned ctlr, int offset, int i,
147 unsigned and, unsigned or)
149 edma_modify(ctlr, offset + (i << 2), and, or);
151 static inline void edma_or_array(unsigned ctlr, int offset, int i, unsigned or)
153 edma_or(ctlr, offset + (i << 2), or);
155 static inline void edma_or_array2(unsigned ctlr, int offset, int i, int j,
158 edma_or(ctlr, offset + ((i*2 + j) << 2), or);
160 static inline void edma_write_array2(unsigned ctlr, int offset, int i, int j,
163 edma_write(ctlr, offset + ((i*2 + j) << 2), val);
165 static inline unsigned int edma_shadow0_read(unsigned ctlr, int offset)
167 return edma_read(ctlr, EDMA_SHADOW0 + offset);
169 static inline unsigned int edma_shadow0_read_array(unsigned ctlr, int offset,
172 return edma_read(ctlr, EDMA_SHADOW0 + offset + (i << 2));
174 static inline void edma_shadow0_write(unsigned ctlr, int offset, unsigned val)
176 edma_write(ctlr, EDMA_SHADOW0 + offset, val);
178 static inline void edma_shadow0_write_array(unsigned ctlr, int offset, int i,
181 edma_write(ctlr, EDMA_SHADOW0 + offset + (i << 2), val);
183 static inline unsigned int edma_parm_read(unsigned ctlr, int offset,
186 return edma_read(ctlr, EDMA_PARM + offset + (param_no << 5));
188 static inline void edma_parm_write(unsigned ctlr, int offset, int param_no,
191 edma_write(ctlr, EDMA_PARM + offset + (param_no << 5), val);
193 static inline void edma_parm_modify(unsigned ctlr, int offset, int param_no,
194 unsigned and, unsigned or)
196 edma_modify(ctlr, EDMA_PARM + offset + (param_no << 5), and, or);
198 static inline void edma_parm_and(unsigned ctlr, int offset, int param_no,
201 edma_and(ctlr, EDMA_PARM + offset + (param_no << 5), and);
203 static inline void edma_parm_or(unsigned ctlr, int offset, int param_no,
206 edma_or(ctlr, EDMA_PARM + offset + (param_no << 5), or);
209 static inline void set_bits(int offset, int len, unsigned long *p)
211 for (; len > 0; len--)
212 set_bit(offset + (len - 1), p);
215 static inline void clear_bits(int offset, int len, unsigned long *p)
217 for (; len > 0; len--)
218 clear_bit(offset + (len - 1), p);
221 /*****************************************************************************/
223 /* actual number of DMA channels and slots on this silicon */
225 /* how many dma resources of each type */
226 unsigned num_channels;
231 enum dma_event_q default_queue;
233 /* list of channels with no even trigger; terminated by "-1" */
236 /* The edma_inuse bit for each PaRAM slot is clear unless the
237 * channel is in use ... by ARM or DSP, for QDMA, or whatever.
239 DECLARE_BITMAP(edma_inuse, EDMA_MAX_PARAMENTRY);
241 /* The edma_unused bit for each channel is clear unless
242 * it is not being used on this platform. It uses a bit
243 * of SOC-specific initialization code.
245 DECLARE_BITMAP(edma_unused, EDMA_MAX_DMACH);
247 unsigned irq_res_start;
248 unsigned irq_res_end;
250 struct dma_interrupt_data {
251 void (*callback)(unsigned channel, unsigned short ch_status,
254 } intr_data[EDMA_MAX_DMACH];
257 static struct edma *edma_cc[EDMA_MAX_CC];
258 static int arch_num_cc;
260 /* dummy param set used to (re)initialize parameter RAM slots */
261 static const struct edmacc_param dummy_paramset = {
262 .link_bcntrld = 0xffff,
266 /*****************************************************************************/
268 static void map_dmach_queue(unsigned ctlr, unsigned ch_no,
269 enum dma_event_q queue_no)
271 int bit = (ch_no & 0x7) * 4;
273 /* default to low priority queue */
274 if (queue_no == EVENTQ_DEFAULT)
275 queue_no = edma_cc[ctlr]->default_queue;
278 edma_modify_array(ctlr, EDMA_DMAQNUM, (ch_no >> 3),
279 ~(0x7 << bit), queue_no << bit);
282 static void __init map_queue_tc(unsigned ctlr, int queue_no, int tc_no)
284 int bit = queue_no * 4;
285 edma_modify(ctlr, EDMA_QUETCMAP, ~(0x7 << bit), ((tc_no & 0x7) << bit));
288 static void __init assign_priority_to_queue(unsigned ctlr, int queue_no,
291 int bit = queue_no * 4;
292 edma_modify(ctlr, EDMA_QUEPRI, ~(0x7 << bit),
293 ((priority & 0x7) << bit));
297 * map_dmach_param - Maps channel number to param entry number
299 * This maps the dma channel number to param entry numberter. In
300 * other words using the DMA channel mapping registers a param entry
301 * can be mapped to any channel
303 * Callers are responsible for ensuring the channel mapping logic is
304 * included in that particular EDMA variant (Eg : dm646x)
307 static void __init map_dmach_param(unsigned ctlr)
310 for (i = 0; i < EDMA_MAX_DMACH; i++)
311 edma_write_array(ctlr, EDMA_DCHMAP , i , (i << 5));
315 setup_dma_interrupt(unsigned lch,
316 void (*callback)(unsigned channel, u16 ch_status, void *data),
321 ctlr = EDMA_CTLR(lch);
322 lch = EDMA_CHAN_SLOT(lch);
325 edma_shadow0_write_array(ctlr, SH_IECR, lch >> 5,
328 edma_cc[ctlr]->intr_data[lch].callback = callback;
329 edma_cc[ctlr]->intr_data[lch].data = data;
332 edma_shadow0_write_array(ctlr, SH_ICR, lch >> 5,
334 edma_shadow0_write_array(ctlr, SH_IESR, lch >> 5,
339 static int irq2ctlr(int irq)
341 if (irq >= edma_cc[0]->irq_res_start && irq <= edma_cc[0]->irq_res_end)
343 else if (irq >= edma_cc[1]->irq_res_start &&
344 irq <= edma_cc[1]->irq_res_end)
350 /******************************************************************************
352 * DMA interrupt handler
354 *****************************************************************************/
355 static irqreturn_t dma_irq_handler(int irq, void *data)
362 ctlr = irq2ctlr(irq);
366 dev_dbg(data, "dma_irq_handler\n");
368 sh_ipr = edma_shadow0_read_array(ctlr, SH_IPR, 0);
370 sh_ipr = edma_shadow0_read_array(ctlr, SH_IPR, 1);
373 sh_ier = edma_shadow0_read_array(ctlr, SH_IER, 1);
376 sh_ier = edma_shadow0_read_array(ctlr, SH_IER, 0);
384 dev_dbg(data, "IPR%d %08x\n", bank, sh_ipr);
386 slot = __ffs(sh_ipr);
387 sh_ipr &= ~(BIT(slot));
389 if (sh_ier & BIT(slot)) {
390 channel = (bank << 5) | slot;
391 /* Clear the corresponding IPR bits */
392 edma_shadow0_write_array(ctlr, SH_ICR, bank,
394 if (edma_cc[ctlr]->intr_data[channel].callback)
395 edma_cc[ctlr]->intr_data[channel].callback(
396 channel, DMA_COMPLETE,
397 edma_cc[ctlr]->intr_data[channel].data);
401 edma_shadow0_write(ctlr, SH_IEVAL, 1);
405 /******************************************************************************
407 * DMA error interrupt handler
409 *****************************************************************************/
410 static irqreturn_t dma_ccerr_handler(int irq, void *data)
414 unsigned int cnt = 0;
416 ctlr = irq2ctlr(irq);
420 dev_dbg(data, "dma_ccerr_handler\n");
422 if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0) &&
423 (edma_read_array(ctlr, EDMA_EMR, 1) == 0) &&
424 (edma_read(ctlr, EDMA_QEMR) == 0) &&
425 (edma_read(ctlr, EDMA_CCERR) == 0))
430 if (edma_read_array(ctlr, EDMA_EMR, 0))
432 else if (edma_read_array(ctlr, EDMA_EMR, 1))
435 dev_dbg(data, "EMR%d %08x\n", j,
436 edma_read_array(ctlr, EDMA_EMR, j));
437 for (i = 0; i < 32; i++) {
438 int k = (j << 5) + i;
439 if (edma_read_array(ctlr, EDMA_EMR, j) &
441 /* Clear the corresponding EMR bits */
442 edma_write_array(ctlr, EDMA_EMCR, j,
445 edma_shadow0_write_array(ctlr, SH_SECR,
447 if (edma_cc[ctlr]->intr_data[k].
449 edma_cc[ctlr]->intr_data[k].
452 edma_cc[ctlr]->intr_data
457 } else if (edma_read(ctlr, EDMA_QEMR)) {
458 dev_dbg(data, "QEMR %02x\n",
459 edma_read(ctlr, EDMA_QEMR));
460 for (i = 0; i < 8; i++) {
461 if (edma_read(ctlr, EDMA_QEMR) & BIT(i)) {
462 /* Clear the corresponding IPR bits */
463 edma_write(ctlr, EDMA_QEMCR, BIT(i));
464 edma_shadow0_write(ctlr, SH_QSECR,
467 /* NOTE: not reported!! */
470 } else if (edma_read(ctlr, EDMA_CCERR)) {
471 dev_dbg(data, "CCERR %08x\n",
472 edma_read(ctlr, EDMA_CCERR));
473 /* FIXME: CCERR.BIT(16) ignored! much better
474 * to just write CCERRCLR with CCERR value...
476 for (i = 0; i < 8; i++) {
477 if (edma_read(ctlr, EDMA_CCERR) & BIT(i)) {
478 /* Clear the corresponding IPR bits */
479 edma_write(ctlr, EDMA_CCERRCLR, BIT(i));
481 /* NOTE: not reported!! */
485 if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0) &&
486 (edma_read_array(ctlr, EDMA_EMR, 1) == 0) &&
487 (edma_read(ctlr, EDMA_QEMR) == 0) &&
488 (edma_read(ctlr, EDMA_CCERR) == 0))
494 edma_write(ctlr, EDMA_EEVAL, 1);
498 static int reserve_contiguous_slots(int ctlr, unsigned int id,
499 unsigned int num_slots,
500 unsigned int start_slot)
503 unsigned int count = num_slots;
504 int stop_slot = start_slot;
505 DECLARE_BITMAP(tmp_inuse, EDMA_MAX_PARAMENTRY);
507 for (i = start_slot; i < edma_cc[ctlr]->num_slots; ++i) {
508 j = EDMA_CHAN_SLOT(i);
509 if (!test_and_set_bit(j, edma_cc[ctlr]->edma_inuse)) {
510 /* Record our current beginning slot */
511 if (count == num_slots)
515 set_bit(j, tmp_inuse);
520 clear_bit(j, tmp_inuse);
522 if (id == EDMA_CONT_PARAMS_FIXED_EXACT) {
532 * We have to clear any bits that we set
533 * if we run out parameter RAM slots, i.e we do find a set
534 * of contiguous parameter RAM slots but do not find the exact number
535 * requested as we may reach the total number of parameter RAM slots
537 if (i == edma_cc[ctlr]->num_slots)
541 for_each_set_bit_from(j, tmp_inuse, stop_slot)
542 clear_bit(j, edma_cc[ctlr]->edma_inuse);
547 for (j = i - num_slots + 1; j <= i; ++j)
548 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(j),
549 &dummy_paramset, PARM_SIZE);
551 return EDMA_CTLR_CHAN(ctlr, i - num_slots + 1);
554 static int prepare_unused_channel_list(struct device *dev, void *data)
556 struct platform_device *pdev = to_platform_device(dev);
559 for (i = 0; i < pdev->num_resources; i++) {
560 if ((pdev->resource[i].flags & IORESOURCE_DMA) &&
561 (int)pdev->resource[i].start >= 0) {
562 ctlr = EDMA_CTLR(pdev->resource[i].start);
563 clear_bit(EDMA_CHAN_SLOT(pdev->resource[i].start),
564 edma_cc[ctlr]->edma_unused);
571 /*-----------------------------------------------------------------------*/
573 static bool unused_chan_list_done;
575 /* Resource alloc/free: dma channels, parameter RAM slots */
578 * edma_alloc_channel - allocate DMA channel and paired parameter RAM
579 * @channel: specific channel to allocate; negative for "any unmapped channel"
580 * @callback: optional; to be issued on DMA completion or errors
581 * @data: passed to callback
582 * @eventq_no: an EVENTQ_* constant, used to choose which Transfer
583 * Controller (TC) executes requests using this channel. Use
584 * EVENTQ_DEFAULT unless you really need a high priority queue.
586 * This allocates a DMA channel and its associated parameter RAM slot.
587 * The parameter RAM is initialized to hold a dummy transfer.
589 * Normal use is to pass a specific channel number as @channel, to make
590 * use of hardware events mapped to that channel. When the channel will
591 * be used only for software triggering or event chaining, channels not
592 * mapped to hardware events (or mapped to unused events) are preferable.
594 * DMA transfers start from a channel using edma_start(), or by
595 * chaining. When the transfer described in that channel's parameter RAM
596 * slot completes, that slot's data may be reloaded through a link.
598 * DMA errors are only reported to the @callback associated with the
599 * channel driving that transfer, but transfer completion callbacks can
600 * be sent to another channel under control of the TCC field in
601 * the option word of the transfer's parameter RAM set. Drivers must not
602 * use DMA transfer completion callbacks for channels they did not allocate.
603 * (The same applies to TCC codes used in transfer chaining.)
605 * Returns the number of the channel, else negative errno.
607 int edma_alloc_channel(int channel,
608 void (*callback)(unsigned channel, u16 ch_status, void *data),
610 enum dma_event_q eventq_no)
612 unsigned i, done = 0, ctlr = 0;
615 if (!unused_chan_list_done) {
617 * Scan all the platform devices to find out the EDMA channels
618 * used and clear them in the unused list, making the rest
619 * available for ARM usage.
621 ret = bus_for_each_dev(&platform_bus_type, NULL, NULL,
622 prepare_unused_channel_list);
626 unused_chan_list_done = true;
630 ctlr = EDMA_CTLR(channel);
631 channel = EDMA_CHAN_SLOT(channel);
635 for (i = 0; i < arch_num_cc; i++) {
638 channel = find_next_bit(edma_cc[i]->edma_unused,
639 edma_cc[i]->num_channels,
641 if (channel == edma_cc[i]->num_channels)
643 if (!test_and_set_bit(channel,
644 edma_cc[i]->edma_inuse)) {
656 } else if (channel >= edma_cc[ctlr]->num_channels) {
658 } else if (test_and_set_bit(channel, edma_cc[ctlr]->edma_inuse)) {
662 /* ensure access through shadow region 0 */
663 edma_or_array2(ctlr, EDMA_DRAE, 0, channel >> 5, BIT(channel & 0x1f));
665 /* ensure no events are pending */
666 edma_stop(EDMA_CTLR_CHAN(ctlr, channel));
667 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
668 &dummy_paramset, PARM_SIZE);
671 setup_dma_interrupt(EDMA_CTLR_CHAN(ctlr, channel),
674 map_dmach_queue(ctlr, channel, eventq_no);
676 return EDMA_CTLR_CHAN(ctlr, channel);
678 EXPORT_SYMBOL(edma_alloc_channel);
682 * edma_free_channel - deallocate DMA channel
683 * @channel: dma channel returned from edma_alloc_channel()
685 * This deallocates the DMA channel and associated parameter RAM slot
686 * allocated by edma_alloc_channel().
688 * Callers are responsible for ensuring the channel is inactive, and
689 * will not be reactivated by linking, chaining, or software calls to
692 void edma_free_channel(unsigned channel)
696 ctlr = EDMA_CTLR(channel);
697 channel = EDMA_CHAN_SLOT(channel);
699 if (channel >= edma_cc[ctlr]->num_channels)
702 setup_dma_interrupt(channel, NULL, NULL);
703 /* REVISIT should probably take out of shadow region 0 */
705 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
706 &dummy_paramset, PARM_SIZE);
707 clear_bit(channel, edma_cc[ctlr]->edma_inuse);
709 EXPORT_SYMBOL(edma_free_channel);
712 * edma_alloc_slot - allocate DMA parameter RAM
713 * @slot: specific slot to allocate; negative for "any unused slot"
715 * This allocates a parameter RAM slot, initializing it to hold a
716 * dummy transfer. Slots allocated using this routine have not been
717 * mapped to a hardware DMA channel, and will normally be used by
718 * linking to them from a slot associated with a DMA channel.
720 * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
721 * slots may be allocated on behalf of DSP firmware.
723 * Returns the number of the slot, else negative errno.
725 int edma_alloc_slot(unsigned ctlr, int slot)
731 slot = EDMA_CHAN_SLOT(slot);
734 slot = edma_cc[ctlr]->num_channels;
736 slot = find_next_zero_bit(edma_cc[ctlr]->edma_inuse,
737 edma_cc[ctlr]->num_slots, slot);
738 if (slot == edma_cc[ctlr]->num_slots)
740 if (!test_and_set_bit(slot, edma_cc[ctlr]->edma_inuse))
743 } else if (slot < edma_cc[ctlr]->num_channels ||
744 slot >= edma_cc[ctlr]->num_slots) {
746 } else if (test_and_set_bit(slot, edma_cc[ctlr]->edma_inuse)) {
750 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
751 &dummy_paramset, PARM_SIZE);
753 return EDMA_CTLR_CHAN(ctlr, slot);
755 EXPORT_SYMBOL(edma_alloc_slot);
758 * edma_free_slot - deallocate DMA parameter RAM
759 * @slot: parameter RAM slot returned from edma_alloc_slot()
761 * This deallocates the parameter RAM slot allocated by edma_alloc_slot().
762 * Callers are responsible for ensuring the slot is inactive, and will
765 void edma_free_slot(unsigned slot)
769 ctlr = EDMA_CTLR(slot);
770 slot = EDMA_CHAN_SLOT(slot);
772 if (slot < edma_cc[ctlr]->num_channels ||
773 slot >= edma_cc[ctlr]->num_slots)
776 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
777 &dummy_paramset, PARM_SIZE);
778 clear_bit(slot, edma_cc[ctlr]->edma_inuse);
780 EXPORT_SYMBOL(edma_free_slot);
784 * edma_alloc_cont_slots- alloc contiguous parameter RAM slots
785 * The API will return the starting point of a set of
786 * contiguous parameter RAM slots that have been requested
788 * @id: can only be EDMA_CONT_PARAMS_ANY or EDMA_CONT_PARAMS_FIXED_EXACT
789 * or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
790 * @count: number of contiguous Paramter RAM slots
791 * @slot - the start value of Parameter RAM slot that should be passed if id
792 * is EDMA_CONT_PARAMS_FIXED_EXACT or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
794 * If id is EDMA_CONT_PARAMS_ANY then the API starts looking for a set of
795 * contiguous Parameter RAM slots from parameter RAM 64 in the case of
796 * DaVinci SOCs and 32 in the case of DA8xx SOCs.
798 * If id is EDMA_CONT_PARAMS_FIXED_EXACT then the API starts looking for a
799 * set of contiguous parameter RAM slots from the "slot" that is passed as an
800 * argument to the API.
802 * If id is EDMA_CONT_PARAMS_FIXED_NOT_EXACT then the API initially tries
803 * starts looking for a set of contiguous parameter RAMs from the "slot"
804 * that is passed as an argument to the API. On failure the API will try to
805 * find a set of contiguous Parameter RAM slots from the remaining Parameter
808 int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count)
811 * The start slot requested should be greater than
812 * the number of channels and lesser than the total number
815 if ((id != EDMA_CONT_PARAMS_ANY) &&
816 (slot < edma_cc[ctlr]->num_channels ||
817 slot >= edma_cc[ctlr]->num_slots))
821 * The number of parameter RAM slots requested cannot be less than 1
822 * and cannot be more than the number of slots minus the number of
825 if (count < 1 || count >
826 (edma_cc[ctlr]->num_slots - edma_cc[ctlr]->num_channels))
830 case EDMA_CONT_PARAMS_ANY:
831 return reserve_contiguous_slots(ctlr, id, count,
832 edma_cc[ctlr]->num_channels);
833 case EDMA_CONT_PARAMS_FIXED_EXACT:
834 case EDMA_CONT_PARAMS_FIXED_NOT_EXACT:
835 return reserve_contiguous_slots(ctlr, id, count, slot);
841 EXPORT_SYMBOL(edma_alloc_cont_slots);
844 * edma_free_cont_slots - deallocate DMA parameter RAM slots
845 * @slot: first parameter RAM of a set of parameter RAM slots to be freed
846 * @count: the number of contiguous parameter RAM slots to be freed
848 * This deallocates the parameter RAM slots allocated by
849 * edma_alloc_cont_slots.
850 * Callers/applications need to keep track of sets of contiguous
851 * parameter RAM slots that have been allocated using the edma_alloc_cont_slots
853 * Callers are responsible for ensuring the slots are inactive, and will
856 int edma_free_cont_slots(unsigned slot, int count)
858 unsigned ctlr, slot_to_free;
861 ctlr = EDMA_CTLR(slot);
862 slot = EDMA_CHAN_SLOT(slot);
864 if (slot < edma_cc[ctlr]->num_channels ||
865 slot >= edma_cc[ctlr]->num_slots ||
869 for (i = slot; i < slot + count; ++i) {
871 slot_to_free = EDMA_CHAN_SLOT(i);
873 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot_to_free),
874 &dummy_paramset, PARM_SIZE);
875 clear_bit(slot_to_free, edma_cc[ctlr]->edma_inuse);
880 EXPORT_SYMBOL(edma_free_cont_slots);
882 /*-----------------------------------------------------------------------*/
884 /* Parameter RAM operations (i) -- read/write partial slots */
887 * edma_set_src - set initial DMA source address in parameter RAM slot
888 * @slot: parameter RAM slot being configured
889 * @src_port: physical address of source (memory, controller FIFO, etc)
890 * @addressMode: INCR, except in very rare cases
891 * @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
892 * width to use when addressing the fifo (e.g. W8BIT, W32BIT)
894 * Note that the source address is modified during the DMA transfer
895 * according to edma_set_src_index().
897 void edma_set_src(unsigned slot, dma_addr_t src_port,
898 enum address_mode mode, enum fifo_width width)
902 ctlr = EDMA_CTLR(slot);
903 slot = EDMA_CHAN_SLOT(slot);
905 if (slot < edma_cc[ctlr]->num_slots) {
906 unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
909 /* set SAM and program FWID */
910 i = (i & ~(EDMA_FWID)) | (SAM | ((width & 0x7) << 8));
915 edma_parm_write(ctlr, PARM_OPT, slot, i);
917 /* set the source port address
918 in source register of param structure */
919 edma_parm_write(ctlr, PARM_SRC, slot, src_port);
922 EXPORT_SYMBOL(edma_set_src);
925 * edma_set_dest - set initial DMA destination address in parameter RAM slot
926 * @slot: parameter RAM slot being configured
927 * @dest_port: physical address of destination (memory, controller FIFO, etc)
928 * @addressMode: INCR, except in very rare cases
929 * @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
930 * width to use when addressing the fifo (e.g. W8BIT, W32BIT)
932 * Note that the destination address is modified during the DMA transfer
933 * according to edma_set_dest_index().
935 void edma_set_dest(unsigned slot, dma_addr_t dest_port,
936 enum address_mode mode, enum fifo_width width)
940 ctlr = EDMA_CTLR(slot);
941 slot = EDMA_CHAN_SLOT(slot);
943 if (slot < edma_cc[ctlr]->num_slots) {
944 unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
947 /* set DAM and program FWID */
948 i = (i & ~(EDMA_FWID)) | (DAM | ((width & 0x7) << 8));
953 edma_parm_write(ctlr, PARM_OPT, slot, i);
954 /* set the destination port address
955 in dest register of param structure */
956 edma_parm_write(ctlr, PARM_DST, slot, dest_port);
959 EXPORT_SYMBOL(edma_set_dest);
962 * edma_get_position - returns the current transfer points
963 * @slot: parameter RAM slot being examined
964 * @src: pointer to source port position
965 * @dst: pointer to destination port position
967 * Returns current source and destination addresses for a particular
968 * parameter RAM slot. Its channel should not be active when this is called.
970 void edma_get_position(unsigned slot, dma_addr_t *src, dma_addr_t *dst)
972 struct edmacc_param temp;
975 ctlr = EDMA_CTLR(slot);
976 slot = EDMA_CHAN_SLOT(slot);
978 edma_read_slot(EDMA_CTLR_CHAN(ctlr, slot), &temp);
984 EXPORT_SYMBOL(edma_get_position);
987 * edma_set_src_index - configure DMA source address indexing
988 * @slot: parameter RAM slot being configured
989 * @src_bidx: byte offset between source arrays in a frame
990 * @src_cidx: byte offset between source frames in a block
992 * Offsets are specified to support either contiguous or discontiguous
993 * memory transfers, or repeated access to a hardware register, as needed.
994 * When accessing hardware registers, both offsets are normally zero.
996 void edma_set_src_index(unsigned slot, s16 src_bidx, s16 src_cidx)
1000 ctlr = EDMA_CTLR(slot);
1001 slot = EDMA_CHAN_SLOT(slot);
1003 if (slot < edma_cc[ctlr]->num_slots) {
1004 edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
1005 0xffff0000, src_bidx);
1006 edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
1007 0xffff0000, src_cidx);
1010 EXPORT_SYMBOL(edma_set_src_index);
1013 * edma_set_dest_index - configure DMA destination address indexing
1014 * @slot: parameter RAM slot being configured
1015 * @dest_bidx: byte offset between destination arrays in a frame
1016 * @dest_cidx: byte offset between destination frames in a block
1018 * Offsets are specified to support either contiguous or discontiguous
1019 * memory transfers, or repeated access to a hardware register, as needed.
1020 * When accessing hardware registers, both offsets are normally zero.
1022 void edma_set_dest_index(unsigned slot, s16 dest_bidx, s16 dest_cidx)
1026 ctlr = EDMA_CTLR(slot);
1027 slot = EDMA_CHAN_SLOT(slot);
1029 if (slot < edma_cc[ctlr]->num_slots) {
1030 edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
1031 0x0000ffff, dest_bidx << 16);
1032 edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
1033 0x0000ffff, dest_cidx << 16);
1036 EXPORT_SYMBOL(edma_set_dest_index);
1039 * edma_set_transfer_params - configure DMA transfer parameters
1040 * @slot: parameter RAM slot being configured
1041 * @acnt: how many bytes per array (at least one)
1042 * @bcnt: how many arrays per frame (at least one)
1043 * @ccnt: how many frames per block (at least one)
1044 * @bcnt_rld: used only for A-Synchronized transfers; this specifies
1045 * the value to reload into bcnt when it decrements to zero
1046 * @sync_mode: ASYNC or ABSYNC
1048 * See the EDMA3 documentation to understand how to configure and link
1049 * transfers using the fields in PaRAM slots. If you are not doing it
1050 * all at once with edma_write_slot(), you will use this routine
1051 * plus two calls each for source and destination, setting the initial
1052 * address and saying how to index that address.
1054 * An example of an A-Synchronized transfer is a serial link using a
1055 * single word shift register. In that case, @acnt would be equal to
1056 * that word size; the serial controller issues a DMA synchronization
1057 * event to transfer each word, and memory access by the DMA transfer
1058 * controller will be word-at-a-time.
1060 * An example of an AB-Synchronized transfer is a device using a FIFO.
1061 * In that case, @acnt equals the FIFO width and @bcnt equals its depth.
1062 * The controller with the FIFO issues DMA synchronization events when
1063 * the FIFO threshold is reached, and the DMA transfer controller will
1064 * transfer one frame to (or from) the FIFO. It will probably use
1065 * efficient burst modes to access memory.
1067 void edma_set_transfer_params(unsigned slot,
1068 u16 acnt, u16 bcnt, u16 ccnt,
1069 u16 bcnt_rld, enum sync_dimension sync_mode)
1073 ctlr = EDMA_CTLR(slot);
1074 slot = EDMA_CHAN_SLOT(slot);
1076 if (slot < edma_cc[ctlr]->num_slots) {
1077 edma_parm_modify(ctlr, PARM_LINK_BCNTRLD, slot,
1078 0x0000ffff, bcnt_rld << 16);
1079 if (sync_mode == ASYNC)
1080 edma_parm_and(ctlr, PARM_OPT, slot, ~SYNCDIM);
1082 edma_parm_or(ctlr, PARM_OPT, slot, SYNCDIM);
1083 /* Set the acount, bcount, ccount registers */
1084 edma_parm_write(ctlr, PARM_A_B_CNT, slot, (bcnt << 16) | acnt);
1085 edma_parm_write(ctlr, PARM_CCNT, slot, ccnt);
1088 EXPORT_SYMBOL(edma_set_transfer_params);
1091 * edma_link - link one parameter RAM slot to another
1092 * @from: parameter RAM slot originating the link
1093 * @to: parameter RAM slot which is the link target
1095 * The originating slot should not be part of any active DMA transfer.
1097 void edma_link(unsigned from, unsigned to)
1099 unsigned ctlr_from, ctlr_to;
1101 ctlr_from = EDMA_CTLR(from);
1102 from = EDMA_CHAN_SLOT(from);
1103 ctlr_to = EDMA_CTLR(to);
1104 to = EDMA_CHAN_SLOT(to);
1106 if (from >= edma_cc[ctlr_from]->num_slots)
1108 if (to >= edma_cc[ctlr_to]->num_slots)
1110 edma_parm_modify(ctlr_from, PARM_LINK_BCNTRLD, from, 0xffff0000,
1113 EXPORT_SYMBOL(edma_link);
1116 * edma_unlink - cut link from one parameter RAM slot
1117 * @from: parameter RAM slot originating the link
1119 * The originating slot should not be part of any active DMA transfer.
1120 * Its link is set to 0xffff.
1122 void edma_unlink(unsigned from)
1126 ctlr = EDMA_CTLR(from);
1127 from = EDMA_CHAN_SLOT(from);
1129 if (from >= edma_cc[ctlr]->num_slots)
1131 edma_parm_or(ctlr, PARM_LINK_BCNTRLD, from, 0xffff);
1133 EXPORT_SYMBOL(edma_unlink);
1135 /*-----------------------------------------------------------------------*/
1137 /* Parameter RAM operations (ii) -- read/write whole parameter sets */
1140 * edma_write_slot - write parameter RAM data for slot
1141 * @slot: number of parameter RAM slot being modified
1142 * @param: data to be written into parameter RAM slot
1144 * Use this to assign all parameters of a transfer at once. This
1145 * allows more efficient setup of transfers than issuing multiple
1146 * calls to set up those parameters in small pieces, and provides
1147 * complete control over all transfer options.
1149 void edma_write_slot(unsigned slot, const struct edmacc_param *param)
1153 ctlr = EDMA_CTLR(slot);
1154 slot = EDMA_CHAN_SLOT(slot);
1156 if (slot >= edma_cc[ctlr]->num_slots)
1158 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot), param,
1161 EXPORT_SYMBOL(edma_write_slot);
1164 * edma_read_slot - read parameter RAM data from slot
1165 * @slot: number of parameter RAM slot being copied
1166 * @param: where to store copy of parameter RAM data
1168 * Use this to read data from a parameter RAM slot, perhaps to
1169 * save them as a template for later reuse.
1171 void edma_read_slot(unsigned slot, struct edmacc_param *param)
1175 ctlr = EDMA_CTLR(slot);
1176 slot = EDMA_CHAN_SLOT(slot);
1178 if (slot >= edma_cc[ctlr]->num_slots)
1180 memcpy_fromio(param, edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
1183 EXPORT_SYMBOL(edma_read_slot);
1185 /*-----------------------------------------------------------------------*/
1187 /* Various EDMA channel control operations */
1190 * edma_pause - pause dma on a channel
1191 * @channel: on which edma_start() has been called
1193 * This temporarily disables EDMA hardware events on the specified channel,
1194 * preventing them from triggering new transfers on its behalf
1196 void edma_pause(unsigned channel)
1200 ctlr = EDMA_CTLR(channel);
1201 channel = EDMA_CHAN_SLOT(channel);
1203 if (channel < edma_cc[ctlr]->num_channels) {
1204 unsigned int mask = BIT(channel & 0x1f);
1206 edma_shadow0_write_array(ctlr, SH_EECR, channel >> 5, mask);
1209 EXPORT_SYMBOL(edma_pause);
1212 * edma_resume - resumes dma on a paused channel
1213 * @channel: on which edma_pause() has been called
1215 * This re-enables EDMA hardware events on the specified channel.
1217 void edma_resume(unsigned channel)
1221 ctlr = EDMA_CTLR(channel);
1222 channel = EDMA_CHAN_SLOT(channel);
1224 if (channel < edma_cc[ctlr]->num_channels) {
1225 unsigned int mask = BIT(channel & 0x1f);
1227 edma_shadow0_write_array(ctlr, SH_EESR, channel >> 5, mask);
1230 EXPORT_SYMBOL(edma_resume);
1233 * edma_start - start dma on a channel
1234 * @channel: channel being activated
1236 * Channels with event associations will be triggered by their hardware
1237 * events, and channels without such associations will be triggered by
1238 * software. (At this writing there is no interface for using software
1239 * triggers except with channels that don't support hardware triggers.)
1241 * Returns zero on success, else negative errno.
1243 int edma_start(unsigned channel)
1247 ctlr = EDMA_CTLR(channel);
1248 channel = EDMA_CHAN_SLOT(channel);
1250 if (channel < edma_cc[ctlr]->num_channels) {
1251 int j = channel >> 5;
1252 unsigned int mask = BIT(channel & 0x1f);
1254 /* EDMA channels without event association */
1255 if (test_bit(channel, edma_cc[ctlr]->edma_unused)) {
1256 pr_debug("EDMA: ESR%d %08x\n", j,
1257 edma_shadow0_read_array(ctlr, SH_ESR, j));
1258 edma_shadow0_write_array(ctlr, SH_ESR, j, mask);
1262 /* EDMA channel with event association */
1263 pr_debug("EDMA: ER%d %08x\n", j,
1264 edma_shadow0_read_array(ctlr, SH_ER, j));
1265 /* Clear any pending event or error */
1266 edma_write_array(ctlr, EDMA_ECR, j, mask);
1267 edma_write_array(ctlr, EDMA_EMCR, j, mask);
1269 edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
1270 edma_shadow0_write_array(ctlr, SH_EESR, j, mask);
1271 pr_debug("EDMA: EER%d %08x\n", j,
1272 edma_shadow0_read_array(ctlr, SH_EER, j));
1278 EXPORT_SYMBOL(edma_start);
1281 * edma_stop - stops dma on the channel passed
1282 * @channel: channel being deactivated
1284 * When @lch is a channel, any active transfer is paused and
1285 * all pending hardware events are cleared. The current transfer
1286 * may not be resumed, and the channel's Parameter RAM should be
1287 * reinitialized before being reused.
1289 void edma_stop(unsigned channel)
1293 ctlr = EDMA_CTLR(channel);
1294 channel = EDMA_CHAN_SLOT(channel);
1296 if (channel < edma_cc[ctlr]->num_channels) {
1297 int j = channel >> 5;
1298 unsigned int mask = BIT(channel & 0x1f);
1300 edma_shadow0_write_array(ctlr, SH_EECR, j, mask);
1301 edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
1302 edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
1303 edma_write_array(ctlr, EDMA_EMCR, j, mask);
1305 pr_debug("EDMA: EER%d %08x\n", j,
1306 edma_shadow0_read_array(ctlr, SH_EER, j));
1308 /* REVISIT: consider guarding against inappropriate event
1309 * chaining by overwriting with dummy_paramset.
1313 EXPORT_SYMBOL(edma_stop);
1315 /******************************************************************************
1317 * It cleans ParamEntry qand bring back EDMA to initial state if media has
1318 * been removed before EDMA has finished.It is usedful for removable media.
1320 * ch_no - channel no
1322 * Return: zero on success, or corresponding error no on failure
1324 * FIXME this should not be needed ... edma_stop() should suffice.
1326 *****************************************************************************/
1328 void edma_clean_channel(unsigned channel)
1332 ctlr = EDMA_CTLR(channel);
1333 channel = EDMA_CHAN_SLOT(channel);
1335 if (channel < edma_cc[ctlr]->num_channels) {
1336 int j = (channel >> 5);
1337 unsigned int mask = BIT(channel & 0x1f);
1339 pr_debug("EDMA: EMR%d %08x\n", j,
1340 edma_read_array(ctlr, EDMA_EMR, j));
1341 edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
1342 /* Clear the corresponding EMR bits */
1343 edma_write_array(ctlr, EDMA_EMCR, j, mask);
1345 edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
1346 edma_write(ctlr, EDMA_CCERRCLR, BIT(16) | BIT(1) | BIT(0));
1349 EXPORT_SYMBOL(edma_clean_channel);
1352 * edma_clear_event - clear an outstanding event on the DMA channel
1354 * channel - channel number
1356 void edma_clear_event(unsigned channel)
1360 ctlr = EDMA_CTLR(channel);
1361 channel = EDMA_CHAN_SLOT(channel);
1363 if (channel >= edma_cc[ctlr]->num_channels)
1366 edma_write(ctlr, EDMA_ECR, BIT(channel));
1368 edma_write(ctlr, EDMA_ECRH, BIT(channel - 32));
1370 EXPORT_SYMBOL(edma_clear_event);
1372 /*-----------------------------------------------------------------------*/
1374 static int __init edma_probe(struct platform_device *pdev)
1376 struct edma_soc_info **info = pdev->dev.platform_data;
1377 const s8 (*queue_priority_mapping)[2];
1378 const s8 (*queue_tc_mapping)[2];
1379 int i, j, off, ln, found = 0;
1381 const s16 (*rsv_chans)[2];
1382 const s16 (*rsv_slots)[2];
1383 int irq[EDMA_MAX_CC] = {0, 0};
1384 int err_irq[EDMA_MAX_CC] = {0, 0};
1385 struct resource *r[EDMA_MAX_CC] = {NULL};
1392 for (j = 0; j < EDMA_MAX_CC; j++) {
1393 sprintf(res_name, "edma_cc%d", j);
1394 r[j] = platform_get_resource_byname(pdev, IORESOURCE_MEM,
1396 if (!r[j] || !info[j]) {
1405 edmacc_regs_base[j] = devm_ioremap_resource(&pdev->dev, r[j]);
1406 if (IS_ERR(edmacc_regs_base[j]))
1407 return PTR_ERR(edmacc_regs_base[j]);
1409 edma_cc[j] = devm_kzalloc(&pdev->dev, sizeof(struct edma),
1414 edma_cc[j]->num_channels = min_t(unsigned, info[j]->n_channel,
1416 edma_cc[j]->num_slots = min_t(unsigned, info[j]->n_slot,
1417 EDMA_MAX_PARAMENTRY);
1418 edma_cc[j]->num_cc = min_t(unsigned, info[j]->n_cc,
1421 edma_cc[j]->default_queue = info[j]->default_queue;
1423 dev_dbg(&pdev->dev, "DMA REG BASE ADDR=%p\n",
1424 edmacc_regs_base[j]);
1426 for (i = 0; i < edma_cc[j]->num_slots; i++)
1427 memcpy_toio(edmacc_regs_base[j] + PARM_OFFSET(i),
1428 &dummy_paramset, PARM_SIZE);
1430 /* Mark all channels as unused */
1431 memset(edma_cc[j]->edma_unused, 0xff,
1432 sizeof(edma_cc[j]->edma_unused));
1436 /* Clear the reserved channels in unused list */
1437 rsv_chans = info[j]->rsv->rsv_chans;
1439 for (i = 0; rsv_chans[i][0] != -1; i++) {
1440 off = rsv_chans[i][0];
1441 ln = rsv_chans[i][1];
1443 edma_cc[j]->edma_unused);
1447 /* Set the reserved slots in inuse list */
1448 rsv_slots = info[j]->rsv->rsv_slots;
1450 for (i = 0; rsv_slots[i][0] != -1; i++) {
1451 off = rsv_slots[i][0];
1452 ln = rsv_slots[i][1];
1454 edma_cc[j]->edma_inuse);
1459 sprintf(irq_name, "edma%d", j);
1460 irq[j] = platform_get_irq_byname(pdev, irq_name);
1461 edma_cc[j]->irq_res_start = irq[j];
1462 status = devm_request_irq(&pdev->dev, irq[j],
1463 dma_irq_handler, 0, "edma",
1467 "devm_request_irq %d failed --> %d\n",
1472 sprintf(irq_name, "edma%d_err", j);
1473 err_irq[j] = platform_get_irq_byname(pdev, irq_name);
1474 edma_cc[j]->irq_res_end = err_irq[j];
1475 status = devm_request_irq(&pdev->dev, err_irq[j],
1476 dma_ccerr_handler, 0,
1477 "edma_error", &pdev->dev);
1480 "devm_request_irq %d failed --> %d\n",
1481 err_irq[j], status);
1485 for (i = 0; i < edma_cc[j]->num_channels; i++)
1486 map_dmach_queue(j, i, info[j]->default_queue);
1488 queue_tc_mapping = info[j]->queue_tc_mapping;
1489 queue_priority_mapping = info[j]->queue_priority_mapping;
1491 /* Event queue to TC mapping */
1492 for (i = 0; queue_tc_mapping[i][0] != -1; i++)
1493 map_queue_tc(j, queue_tc_mapping[i][0],
1494 queue_tc_mapping[i][1]);
1496 /* Event queue priority mapping */
1497 for (i = 0; queue_priority_mapping[i][0] != -1; i++)
1498 assign_priority_to_queue(j,
1499 queue_priority_mapping[i][0],
1500 queue_priority_mapping[i][1]);
1502 /* Map the channel to param entry if channel mapping logic
1505 if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
1508 for (i = 0; i < info[j]->n_region; i++) {
1509 edma_write_array2(j, EDMA_DRAE, i, 0, 0x0);
1510 edma_write_array2(j, EDMA_DRAE, i, 1, 0x0);
1511 edma_write_array(j, EDMA_QRAE, i, 0x0);
1520 static struct platform_driver edma_driver = {
1521 .driver.name = "edma",
1524 static int __init edma_init(void)
1526 return platform_driver_probe(&edma_driver, edma_probe);
1528 arch_initcall(edma_init);