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/kernel.h>
21 #include <linux/sched.h>
22 #include <linux/init.h>
23 #include <linux/module.h>
24 #include <linux/interrupt.h>
25 #include <linux/platform_device.h>
26 #include <linux/spinlock.h>
27 #include <linux/compiler.h>
30 #include <mach/cputype.h>
31 #include <mach/memory.h>
32 #include <mach/hardware.h>
33 #include <mach/irqs.h>
34 #include <mach/edma.h>
38 /* Offsets matching "struct edmacc_param" */
41 #define PARM_A_B_CNT 0x08
43 #define PARM_SRC_DST_BIDX 0x10
44 #define PARM_LINK_BCNTRLD 0x14
45 #define PARM_SRC_DST_CIDX 0x18
46 #define PARM_CCNT 0x1c
48 #define PARM_SIZE 0x20
50 /* Offsets for EDMA CC global channel registers and their shadows */
51 #define SH_ER 0x00 /* 64 bits */
52 #define SH_ECR 0x08 /* 64 bits */
53 #define SH_ESR 0x10 /* 64 bits */
54 #define SH_CER 0x18 /* 64 bits */
55 #define SH_EER 0x20 /* 64 bits */
56 #define SH_EECR 0x28 /* 64 bits */
57 #define SH_EESR 0x30 /* 64 bits */
58 #define SH_SER 0x38 /* 64 bits */
59 #define SH_SECR 0x40 /* 64 bits */
60 #define SH_IER 0x50 /* 64 bits */
61 #define SH_IECR 0x58 /* 64 bits */
62 #define SH_IESR 0x60 /* 64 bits */
63 #define SH_IPR 0x68 /* 64 bits */
64 #define SH_ICR 0x70 /* 64 bits */
74 /* Offsets for EDMA CC global registers */
75 #define EDMA_REV 0x0000
76 #define EDMA_CCCFG 0x0004
77 #define EDMA_QCHMAP 0x0200 /* 8 registers */
78 #define EDMA_DMAQNUM 0x0240 /* 8 registers (4 on OMAP-L1xx) */
79 #define EDMA_QDMAQNUM 0x0260
80 #define EDMA_QUETCMAP 0x0280
81 #define EDMA_QUEPRI 0x0284
82 #define EDMA_EMR 0x0300 /* 64 bits */
83 #define EDMA_EMCR 0x0308 /* 64 bits */
84 #define EDMA_QEMR 0x0310
85 #define EDMA_QEMCR 0x0314
86 #define EDMA_CCERR 0x0318
87 #define EDMA_CCERRCLR 0x031c
88 #define EDMA_EEVAL 0x0320
89 #define EDMA_DRAE 0x0340 /* 4 x 64 bits*/
90 #define EDMA_QRAE 0x0380 /* 4 registers */
91 #define EDMA_QUEEVTENTRY 0x0400 /* 2 x 16 registers */
92 #define EDMA_QSTAT 0x0600 /* 2 registers */
93 #define EDMA_QWMTHRA 0x0620
94 #define EDMA_QWMTHRB 0x0624
95 #define EDMA_CCSTAT 0x0640
97 #define EDMA_M 0x1000 /* global channel registers */
98 #define EDMA_ECR 0x1008
99 #define EDMA_ECRH 0x100C
100 #define EDMA_SHADOW0 0x2000 /* 4 regions shadowing global channels */
101 #define EDMA_PARM 0x4000 /* 128 param entries */
103 #define PARM_OFFSET(param_no) (EDMA_PARM + ((param_no) << 5))
105 #define EDMA_DCHMAP 0x0100 /* 64 registers */
106 #define CHMAP_EXIST BIT(24)
108 #define EDMA_MAX_DMACH 64
109 #define EDMA_MAX_PARAMENTRY 512
110 #define EDMA_MAX_CC 2
113 /*****************************************************************************/
115 static void __iomem *edmacc_regs_base[EDMA_MAX_CC];
117 static inline unsigned int edma_read(unsigned ctlr, int offset)
119 return (unsigned int)__raw_readl(edmacc_regs_base[ctlr] + offset);
122 static inline void edma_write(unsigned ctlr, int offset, int val)
124 __raw_writel(val, edmacc_regs_base[ctlr] + offset);
126 static inline void edma_modify(unsigned ctlr, int offset, unsigned and,
129 unsigned val = edma_read(ctlr, offset);
132 edma_write(ctlr, offset, val);
134 static inline void edma_and(unsigned ctlr, int offset, unsigned and)
136 unsigned val = edma_read(ctlr, offset);
138 edma_write(ctlr, offset, val);
140 static inline void edma_or(unsigned ctlr, int offset, unsigned or)
142 unsigned val = edma_read(ctlr, offset);
144 edma_write(ctlr, offset, val);
146 static inline unsigned int edma_read_array(unsigned ctlr, int offset, int i)
148 return edma_read(ctlr, offset + (i << 2));
150 static inline void edma_write_array(unsigned ctlr, int offset, int i,
153 edma_write(ctlr, offset + (i << 2), val);
155 static inline void edma_modify_array(unsigned ctlr, int offset, int i,
156 unsigned and, unsigned or)
158 edma_modify(ctlr, offset + (i << 2), and, or);
160 static inline void edma_or_array(unsigned ctlr, int offset, int i, unsigned or)
162 edma_or(ctlr, offset + (i << 2), or);
164 static inline void edma_or_array2(unsigned ctlr, int offset, int i, int j,
167 edma_or(ctlr, offset + ((i*2 + j) << 2), or);
169 static inline void edma_write_array2(unsigned ctlr, int offset, int i, int j,
172 edma_write(ctlr, offset + ((i*2 + j) << 2), val);
174 static inline unsigned int edma_shadow0_read(unsigned ctlr, int offset)
176 return edma_read(ctlr, EDMA_SHADOW0 + offset);
178 static inline unsigned int edma_shadow0_read_array(unsigned ctlr, int offset,
181 return edma_read(ctlr, EDMA_SHADOW0 + offset + (i << 2));
183 static inline void edma_shadow0_write(unsigned ctlr, int offset, unsigned val)
185 edma_write(ctlr, EDMA_SHADOW0 + offset, val);
187 static inline void edma_shadow0_write_array(unsigned ctlr, int offset, int i,
190 edma_write(ctlr, EDMA_SHADOW0 + offset + (i << 2), val);
192 static inline unsigned int edma_parm_read(unsigned ctlr, int offset,
195 return edma_read(ctlr, EDMA_PARM + offset + (param_no << 5));
197 static inline void edma_parm_write(unsigned ctlr, int offset, int param_no,
200 edma_write(ctlr, EDMA_PARM + offset + (param_no << 5), val);
202 static inline void edma_parm_modify(unsigned ctlr, int offset, int param_no,
203 unsigned and, unsigned or)
205 edma_modify(ctlr, EDMA_PARM + offset + (param_no << 5), and, or);
207 static inline void edma_parm_and(unsigned ctlr, int offset, int param_no,
210 edma_and(ctlr, EDMA_PARM + offset + (param_no << 5), and);
212 static inline void edma_parm_or(unsigned ctlr, int offset, int param_no,
215 edma_or(ctlr, EDMA_PARM + offset + (param_no << 5), or);
218 /*****************************************************************************/
220 /* actual number of DMA channels and slots on this silicon */
222 /* how many dma resources of each type */
223 unsigned num_channels;
228 enum dma_event_q default_queue;
230 /* list of channels with no even trigger; terminated by "-1" */
233 /* The edma_inuse bit for each PaRAM slot is clear unless the
234 * channel is in use ... by ARM or DSP, for QDMA, or whatever.
236 DECLARE_BITMAP(edma_inuse, EDMA_MAX_PARAMENTRY);
238 /* The edma_noevent bit for each channel is clear unless
239 * it doesn't trigger DMA events on this platform. It uses a
240 * bit of SOC-specific initialization code.
242 DECLARE_BITMAP(edma_noevent, EDMA_MAX_DMACH);
244 unsigned irq_res_start;
245 unsigned irq_res_end;
247 struct dma_interrupt_data {
248 void (*callback)(unsigned channel, unsigned short ch_status,
251 } intr_data[EDMA_MAX_DMACH];
254 static struct edma *edma_info[EDMA_MAX_CC];
256 /* dummy param set used to (re)initialize parameter RAM slots */
257 static const struct edmacc_param dummy_paramset = {
258 .link_bcntrld = 0xffff,
262 /*****************************************************************************/
264 static void map_dmach_queue(unsigned ctlr, unsigned ch_no,
265 enum dma_event_q queue_no)
267 int bit = (ch_no & 0x7) * 4;
269 /* default to low priority queue */
270 if (queue_no == EVENTQ_DEFAULT)
271 queue_no = edma_info[ctlr]->default_queue;
274 edma_modify_array(ctlr, EDMA_DMAQNUM, (ch_no >> 3),
275 ~(0x7 << bit), queue_no << bit);
278 static void __init map_queue_tc(unsigned ctlr, int queue_no, int tc_no)
280 int bit = queue_no * 4;
281 edma_modify(ctlr, EDMA_QUETCMAP, ~(0x7 << bit), ((tc_no & 0x7) << bit));
284 static void __init assign_priority_to_queue(unsigned ctlr, int queue_no,
287 int bit = queue_no * 4;
288 edma_modify(ctlr, EDMA_QUEPRI, ~(0x7 << bit),
289 ((priority & 0x7) << bit));
293 * map_dmach_param - Maps channel number to param entry number
295 * This maps the dma channel number to param entry numberter. In
296 * other words using the DMA channel mapping registers a param entry
297 * can be mapped to any channel
299 * Callers are responsible for ensuring the channel mapping logic is
300 * included in that particular EDMA variant (Eg : dm646x)
303 static void __init map_dmach_param(unsigned ctlr)
306 for (i = 0; i < EDMA_MAX_DMACH; i++)
307 edma_write_array(ctlr, EDMA_DCHMAP , i , (i << 5));
311 setup_dma_interrupt(unsigned lch,
312 void (*callback)(unsigned channel, u16 ch_status, void *data),
317 ctlr = EDMA_CTLR(lch);
318 lch = EDMA_CHAN_SLOT(lch);
321 edma_shadow0_write_array(ctlr, SH_IECR, lch >> 5,
322 (1 << (lch & 0x1f)));
325 edma_info[ctlr]->intr_data[lch].callback = callback;
326 edma_info[ctlr]->intr_data[lch].data = data;
329 edma_shadow0_write_array(ctlr, SH_ICR, lch >> 5,
330 (1 << (lch & 0x1f)));
331 edma_shadow0_write_array(ctlr, SH_IESR, lch >> 5,
332 (1 << (lch & 0x1f)));
336 static int irq2ctlr(int irq)
338 if (irq >= edma_info[0]->irq_res_start &&
339 irq <= edma_info[0]->irq_res_end)
341 else if (irq >= edma_info[1]->irq_res_start &&
342 irq <= edma_info[1]->irq_res_end)
348 /******************************************************************************
350 * DMA interrupt handler
352 *****************************************************************************/
353 static irqreturn_t dma_irq_handler(int irq, void *data)
357 unsigned int cnt = 0;
359 ctlr = irq2ctlr(irq);
361 dev_dbg(data, "dma_irq_handler\n");
363 if ((edma_shadow0_read_array(ctlr, SH_IPR, 0) == 0)
364 && (edma_shadow0_read_array(ctlr, SH_IPR, 1) == 0))
369 if (edma_shadow0_read_array(ctlr, SH_IPR, 0))
371 else if (edma_shadow0_read_array(ctlr, SH_IPR, 1))
375 dev_dbg(data, "IPR%d %08x\n", j,
376 edma_shadow0_read_array(ctlr, SH_IPR, j));
377 for (i = 0; i < 32; i++) {
378 int k = (j << 5) + i;
379 if (edma_shadow0_read_array(ctlr, SH_IPR, j) &
381 /* Clear the corresponding IPR bits */
382 edma_shadow0_write_array(ctlr, SH_ICR, j,
384 if (edma_info[ctlr]->intr_data[k].callback) {
385 edma_info[ctlr]->intr_data[k].callback(
387 edma_info[ctlr]->intr_data[k].
396 edma_shadow0_write(ctlr, SH_IEVAL, 1);
400 /******************************************************************************
402 * DMA error interrupt handler
404 *****************************************************************************/
405 static irqreturn_t dma_ccerr_handler(int irq, void *data)
409 unsigned int cnt = 0;
411 ctlr = irq2ctlr(irq);
413 dev_dbg(data, "dma_ccerr_handler\n");
415 if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0) &&
416 (edma_read_array(ctlr, EDMA_EMR, 1) == 0) &&
417 (edma_read(ctlr, EDMA_QEMR) == 0) &&
418 (edma_read(ctlr, EDMA_CCERR) == 0))
423 if (edma_read_array(ctlr, EDMA_EMR, 0))
425 else if (edma_read_array(ctlr, EDMA_EMR, 1))
428 dev_dbg(data, "EMR%d %08x\n", j,
429 edma_read_array(ctlr, EDMA_EMR, j));
430 for (i = 0; i < 32; i++) {
431 int k = (j << 5) + i;
432 if (edma_read_array(ctlr, EDMA_EMR, j) &
434 /* Clear the corresponding EMR bits */
435 edma_write_array(ctlr, EDMA_EMCR, j,
438 edma_shadow0_write_array(ctlr, SH_SECR,
440 if (edma_info[ctlr]->intr_data[k].
442 edma_info[ctlr]->intr_data[k].
445 edma_info[ctlr]->intr_data
450 } else if (edma_read(ctlr, EDMA_QEMR)) {
451 dev_dbg(data, "QEMR %02x\n",
452 edma_read(ctlr, EDMA_QEMR));
453 for (i = 0; i < 8; i++) {
454 if (edma_read(ctlr, EDMA_QEMR) & (1 << i)) {
455 /* Clear the corresponding IPR bits */
456 edma_write(ctlr, EDMA_QEMCR, 1 << i);
457 edma_shadow0_write(ctlr, SH_QSECR,
460 /* NOTE: not reported!! */
463 } else if (edma_read(ctlr, EDMA_CCERR)) {
464 dev_dbg(data, "CCERR %08x\n",
465 edma_read(ctlr, EDMA_CCERR));
466 /* FIXME: CCERR.BIT(16) ignored! much better
467 * to just write CCERRCLR with CCERR value...
469 for (i = 0; i < 8; i++) {
470 if (edma_read(ctlr, EDMA_CCERR) & (1 << i)) {
471 /* Clear the corresponding IPR bits */
472 edma_write(ctlr, EDMA_CCERRCLR, 1 << i);
474 /* NOTE: not reported!! */
478 if ((edma_read_array(ctlr, EDMA_EMR, 0) == 0)
479 && (edma_read_array(ctlr, EDMA_EMR, 1) == 0)
480 && (edma_read(ctlr, EDMA_QEMR) == 0)
481 && (edma_read(ctlr, EDMA_CCERR) == 0)) {
488 edma_write(ctlr, EDMA_EEVAL, 1);
492 /******************************************************************************
494 * Transfer controller error interrupt handlers
496 *****************************************************************************/
498 #define tc_errs_handled false /* disabled as long as they're NOPs */
500 static irqreturn_t dma_tc0err_handler(int irq, void *data)
502 dev_dbg(data, "dma_tc0err_handler\n");
506 static irqreturn_t dma_tc1err_handler(int irq, void *data)
508 dev_dbg(data, "dma_tc1err_handler\n");
512 static int reserve_contiguous_slots(int ctlr, unsigned int id,
513 unsigned int num_slots,
514 unsigned int start_slot)
517 unsigned int count = num_slots;
518 int stop_slot = start_slot;
519 DECLARE_BITMAP(tmp_inuse, EDMA_MAX_PARAMENTRY);
521 for (i = start_slot; i < edma_info[ctlr]->num_slots; ++i) {
522 j = EDMA_CHAN_SLOT(i);
523 if (!test_and_set_bit(j, edma_info[ctlr]->edma_inuse)) {
524 /* Record our current beginning slot */
525 if (count == num_slots)
529 set_bit(j, tmp_inuse);
534 clear_bit(j, tmp_inuse);
536 if (id == EDMA_CONT_PARAMS_FIXED_EXACT) {
545 * We have to clear any bits that we set
546 * if we run out parameter RAM slots, i.e we do find a set
547 * of contiguous parameter RAM slots but do not find the exact number
548 * requested as we may reach the total number of parameter RAM slots
550 if (i == edma_info[ctlr]->num_slots)
553 for (j = start_slot; j < stop_slot; j++)
554 if (test_bit(j, tmp_inuse))
555 clear_bit(j, edma_info[ctlr]->edma_inuse);
560 for (j = i - num_slots + 1; j <= i; ++j)
561 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(j),
562 &dummy_paramset, PARM_SIZE);
564 return EDMA_CTLR_CHAN(ctlr, i - num_slots + 1);
567 /*-----------------------------------------------------------------------*/
569 /* Resource alloc/free: dma channels, parameter RAM slots */
572 * edma_alloc_channel - allocate DMA channel and paired parameter RAM
573 * @channel: specific channel to allocate; negative for "any unmapped channel"
574 * @callback: optional; to be issued on DMA completion or errors
575 * @data: passed to callback
576 * @eventq_no: an EVENTQ_* constant, used to choose which Transfer
577 * Controller (TC) executes requests using this channel. Use
578 * EVENTQ_DEFAULT unless you really need a high priority queue.
580 * This allocates a DMA channel and its associated parameter RAM slot.
581 * The parameter RAM is initialized to hold a dummy transfer.
583 * Normal use is to pass a specific channel number as @channel, to make
584 * use of hardware events mapped to that channel. When the channel will
585 * be used only for software triggering or event chaining, channels not
586 * mapped to hardware events (or mapped to unused events) are preferable.
588 * DMA transfers start from a channel using edma_start(), or by
589 * chaining. When the transfer described in that channel's parameter RAM
590 * slot completes, that slot's data may be reloaded through a link.
592 * DMA errors are only reported to the @callback associated with the
593 * channel driving that transfer, but transfer completion callbacks can
594 * be sent to another channel under control of the TCC field in
595 * the option word of the transfer's parameter RAM set. Drivers must not
596 * use DMA transfer completion callbacks for channels they did not allocate.
597 * (The same applies to TCC codes used in transfer chaining.)
599 * Returns the number of the channel, else negative errno.
601 int edma_alloc_channel(int channel,
602 void (*callback)(unsigned channel, u16 ch_status, void *data),
604 enum dma_event_q eventq_no)
606 unsigned i, done, ctlr = 0;
609 ctlr = EDMA_CTLR(channel);
610 channel = EDMA_CHAN_SLOT(channel);
614 for (i = 0; i < EDMA_MAX_CC; i++) {
617 channel = find_next_bit(edma_info[i]->
619 edma_info[i]->num_channels,
621 if (channel == edma_info[i]->num_channels)
623 if (!test_and_set_bit(channel,
624 edma_info[i]->edma_inuse)) {
634 } else if (channel >= edma_info[ctlr]->num_channels) {
636 } else if (test_and_set_bit(channel, edma_info[ctlr]->edma_inuse)) {
640 /* ensure access through shadow region 0 */
641 edma_or_array2(ctlr, EDMA_DRAE, 0, channel >> 5, 1 << (channel & 0x1f));
643 /* ensure no events are pending */
644 edma_stop(EDMA_CTLR_CHAN(ctlr, channel));
645 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
646 &dummy_paramset, PARM_SIZE);
649 setup_dma_interrupt(EDMA_CTLR_CHAN(ctlr, channel),
652 map_dmach_queue(ctlr, channel, eventq_no);
656 EXPORT_SYMBOL(edma_alloc_channel);
660 * edma_free_channel - deallocate DMA channel
661 * @channel: dma channel returned from edma_alloc_channel()
663 * This deallocates the DMA channel and associated parameter RAM slot
664 * allocated by edma_alloc_channel().
666 * Callers are responsible for ensuring the channel is inactive, and
667 * will not be reactivated by linking, chaining, or software calls to
670 void edma_free_channel(unsigned channel)
674 ctlr = EDMA_CTLR(channel);
675 channel = EDMA_CHAN_SLOT(channel);
677 if (channel >= edma_info[ctlr]->num_channels)
680 setup_dma_interrupt(channel, NULL, NULL);
681 /* REVISIT should probably take out of shadow region 0 */
683 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(channel),
684 &dummy_paramset, PARM_SIZE);
685 clear_bit(channel, edma_info[ctlr]->edma_inuse);
687 EXPORT_SYMBOL(edma_free_channel);
690 * edma_alloc_slot - allocate DMA parameter RAM
691 * @slot: specific slot to allocate; negative for "any unused slot"
693 * This allocates a parameter RAM slot, initializing it to hold a
694 * dummy transfer. Slots allocated using this routine have not been
695 * mapped to a hardware DMA channel, and will normally be used by
696 * linking to them from a slot associated with a DMA channel.
698 * Normal use is to pass EDMA_SLOT_ANY as the @slot, but specific
699 * slots may be allocated on behalf of DSP firmware.
701 * Returns the number of the slot, else negative errno.
703 int edma_alloc_slot(unsigned ctlr, int slot)
706 slot = EDMA_CHAN_SLOT(slot);
709 slot = edma_info[ctlr]->num_channels;
711 slot = find_next_zero_bit(edma_info[ctlr]->edma_inuse,
712 edma_info[ctlr]->num_slots, slot);
713 if (slot == edma_info[ctlr]->num_slots)
715 if (!test_and_set_bit(slot,
716 edma_info[ctlr]->edma_inuse))
719 } else if (slot < edma_info[ctlr]->num_channels ||
720 slot >= edma_info[ctlr]->num_slots) {
722 } else if (test_and_set_bit(slot, edma_info[ctlr]->edma_inuse)) {
726 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
727 &dummy_paramset, PARM_SIZE);
729 return EDMA_CTLR_CHAN(ctlr, slot);
731 EXPORT_SYMBOL(edma_alloc_slot);
734 * edma_free_slot - deallocate DMA parameter RAM
735 * @slot: parameter RAM slot returned from edma_alloc_slot()
737 * This deallocates the parameter RAM slot allocated by edma_alloc_slot().
738 * Callers are responsible for ensuring the slot is inactive, and will
741 void edma_free_slot(unsigned slot)
745 ctlr = EDMA_CTLR(slot);
746 slot = EDMA_CHAN_SLOT(slot);
748 if (slot < edma_info[ctlr]->num_channels ||
749 slot >= edma_info[ctlr]->num_slots)
752 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
753 &dummy_paramset, PARM_SIZE);
754 clear_bit(slot, edma_info[ctlr]->edma_inuse);
756 EXPORT_SYMBOL(edma_free_slot);
760 * edma_alloc_cont_slots- alloc contiguous parameter RAM slots
761 * The API will return the starting point of a set of
762 * contiguous parameter RAM slots that have been requested
764 * @id: can only be EDMA_CONT_PARAMS_ANY or EDMA_CONT_PARAMS_FIXED_EXACT
765 * or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
766 * @count: number of contiguous Paramter RAM slots
767 * @slot - the start value of Parameter RAM slot that should be passed if id
768 * is EDMA_CONT_PARAMS_FIXED_EXACT or EDMA_CONT_PARAMS_FIXED_NOT_EXACT
770 * If id is EDMA_CONT_PARAMS_ANY then the API starts looking for a set of
771 * contiguous Parameter RAM slots from parameter RAM 64 in the case of
772 * DaVinci SOCs and 32 in the case of DA8xx SOCs.
774 * If id is EDMA_CONT_PARAMS_FIXED_EXACT then the API starts looking for a
775 * set of contiguous parameter RAM slots from the "slot" that is passed as an
776 * argument to the API.
778 * If id is EDMA_CONT_PARAMS_FIXED_NOT_EXACT then the API initially tries
779 * starts looking for a set of contiguous parameter RAMs from the "slot"
780 * that is passed as an argument to the API. On failure the API will try to
781 * find a set of contiguous Parameter RAM slots from the remaining Parameter
784 int edma_alloc_cont_slots(unsigned ctlr, unsigned int id, int slot, int count)
787 * The start slot requested should be greater than
788 * the number of channels and lesser than the total number
791 if ((id != EDMA_CONT_PARAMS_ANY) &&
792 (slot < edma_info[ctlr]->num_channels ||
793 slot >= edma_info[ctlr]->num_slots))
797 * The number of parameter RAM slots requested cannot be less than 1
798 * and cannot be more than the number of slots minus the number of
801 if (count < 1 || count >
802 (edma_info[ctlr]->num_slots - edma_info[ctlr]->num_channels))
806 case EDMA_CONT_PARAMS_ANY:
807 return reserve_contiguous_slots(ctlr, id, count,
808 edma_info[ctlr]->num_channels);
809 case EDMA_CONT_PARAMS_FIXED_EXACT:
810 case EDMA_CONT_PARAMS_FIXED_NOT_EXACT:
811 return reserve_contiguous_slots(ctlr, id, count, slot);
817 EXPORT_SYMBOL(edma_alloc_cont_slots);
820 * edma_free_cont_slots - deallocate DMA parameter RAM slots
821 * @slot: first parameter RAM of a set of parameter RAM slots to be freed
822 * @count: the number of contiguous parameter RAM slots to be freed
824 * This deallocates the parameter RAM slots allocated by
825 * edma_alloc_cont_slots.
826 * Callers/applications need to keep track of sets of contiguous
827 * parameter RAM slots that have been allocated using the edma_alloc_cont_slots
829 * Callers are responsible for ensuring the slots are inactive, and will
832 int edma_free_cont_slots(unsigned slot, int count)
834 unsigned ctlr, slot_to_free;
837 ctlr = EDMA_CTLR(slot);
838 slot = EDMA_CHAN_SLOT(slot);
840 if (slot < edma_info[ctlr]->num_channels ||
841 slot >= edma_info[ctlr]->num_slots ||
845 for (i = slot; i < slot + count; ++i) {
847 slot_to_free = EDMA_CHAN_SLOT(i);
849 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot_to_free),
850 &dummy_paramset, PARM_SIZE);
851 clear_bit(slot_to_free, edma_info[ctlr]->edma_inuse);
856 EXPORT_SYMBOL(edma_free_cont_slots);
858 /*-----------------------------------------------------------------------*/
860 /* Parameter RAM operations (i) -- read/write partial slots */
863 * edma_set_src - set initial DMA source address in parameter RAM slot
864 * @slot: parameter RAM slot being configured
865 * @src_port: physical address of source (memory, controller FIFO, etc)
866 * @addressMode: INCR, except in very rare cases
867 * @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
868 * width to use when addressing the fifo (e.g. W8BIT, W32BIT)
870 * Note that the source address is modified during the DMA transfer
871 * according to edma_set_src_index().
873 void edma_set_src(unsigned slot, dma_addr_t src_port,
874 enum address_mode mode, enum fifo_width width)
878 ctlr = EDMA_CTLR(slot);
879 slot = EDMA_CHAN_SLOT(slot);
881 if (slot < edma_info[ctlr]->num_slots) {
882 unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
885 /* set SAM and program FWID */
886 i = (i & ~(EDMA_FWID)) | (SAM | ((width & 0x7) << 8));
891 edma_parm_write(ctlr, PARM_OPT, slot, i);
893 /* set the source port address
894 in source register of param structure */
895 edma_parm_write(ctlr, PARM_SRC, slot, src_port);
898 EXPORT_SYMBOL(edma_set_src);
901 * edma_set_dest - set initial DMA destination address in parameter RAM slot
902 * @slot: parameter RAM slot being configured
903 * @dest_port: physical address of destination (memory, controller FIFO, etc)
904 * @addressMode: INCR, except in very rare cases
905 * @fifoWidth: ignored unless @addressMode is FIFO, else specifies the
906 * width to use when addressing the fifo (e.g. W8BIT, W32BIT)
908 * Note that the destination address is modified during the DMA transfer
909 * according to edma_set_dest_index().
911 void edma_set_dest(unsigned slot, dma_addr_t dest_port,
912 enum address_mode mode, enum fifo_width width)
916 ctlr = EDMA_CTLR(slot);
917 slot = EDMA_CHAN_SLOT(slot);
919 if (slot < edma_info[ctlr]->num_slots) {
920 unsigned int i = edma_parm_read(ctlr, PARM_OPT, slot);
923 /* set DAM and program FWID */
924 i = (i & ~(EDMA_FWID)) | (DAM | ((width & 0x7) << 8));
929 edma_parm_write(ctlr, PARM_OPT, slot, i);
930 /* set the destination port address
931 in dest register of param structure */
932 edma_parm_write(ctlr, PARM_DST, slot, dest_port);
935 EXPORT_SYMBOL(edma_set_dest);
938 * edma_get_position - returns the current transfer points
939 * @slot: parameter RAM slot being examined
940 * @src: pointer to source port position
941 * @dst: pointer to destination port position
943 * Returns current source and destination addresses for a particular
944 * parameter RAM slot. Its channel should not be active when this is called.
946 void edma_get_position(unsigned slot, dma_addr_t *src, dma_addr_t *dst)
948 struct edmacc_param temp;
951 ctlr = EDMA_CTLR(slot);
952 slot = EDMA_CHAN_SLOT(slot);
954 edma_read_slot(EDMA_CTLR_CHAN(ctlr, slot), &temp);
960 EXPORT_SYMBOL(edma_get_position);
963 * edma_set_src_index - configure DMA source address indexing
964 * @slot: parameter RAM slot being configured
965 * @src_bidx: byte offset between source arrays in a frame
966 * @src_cidx: byte offset between source frames in a block
968 * Offsets are specified to support either contiguous or discontiguous
969 * memory transfers, or repeated access to a hardware register, as needed.
970 * When accessing hardware registers, both offsets are normally zero.
972 void edma_set_src_index(unsigned slot, s16 src_bidx, s16 src_cidx)
976 ctlr = EDMA_CTLR(slot);
977 slot = EDMA_CHAN_SLOT(slot);
979 if (slot < edma_info[ctlr]->num_slots) {
980 edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
981 0xffff0000, src_bidx);
982 edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
983 0xffff0000, src_cidx);
986 EXPORT_SYMBOL(edma_set_src_index);
989 * edma_set_dest_index - configure DMA destination address indexing
990 * @slot: parameter RAM slot being configured
991 * @dest_bidx: byte offset between destination arrays in a frame
992 * @dest_cidx: byte offset between destination frames in a block
994 * Offsets are specified to support either contiguous or discontiguous
995 * memory transfers, or repeated access to a hardware register, as needed.
996 * When accessing hardware registers, both offsets are normally zero.
998 void edma_set_dest_index(unsigned slot, s16 dest_bidx, s16 dest_cidx)
1002 ctlr = EDMA_CTLR(slot);
1003 slot = EDMA_CHAN_SLOT(slot);
1005 if (slot < edma_info[ctlr]->num_slots) {
1006 edma_parm_modify(ctlr, PARM_SRC_DST_BIDX, slot,
1007 0x0000ffff, dest_bidx << 16);
1008 edma_parm_modify(ctlr, PARM_SRC_DST_CIDX, slot,
1009 0x0000ffff, dest_cidx << 16);
1012 EXPORT_SYMBOL(edma_set_dest_index);
1015 * edma_set_transfer_params - configure DMA transfer parameters
1016 * @slot: parameter RAM slot being configured
1017 * @acnt: how many bytes per array (at least one)
1018 * @bcnt: how many arrays per frame (at least one)
1019 * @ccnt: how many frames per block (at least one)
1020 * @bcnt_rld: used only for A-Synchronized transfers; this specifies
1021 * the value to reload into bcnt when it decrements to zero
1022 * @sync_mode: ASYNC or ABSYNC
1024 * See the EDMA3 documentation to understand how to configure and link
1025 * transfers using the fields in PaRAM slots. If you are not doing it
1026 * all at once with edma_write_slot(), you will use this routine
1027 * plus two calls each for source and destination, setting the initial
1028 * address and saying how to index that address.
1030 * An example of an A-Synchronized transfer is a serial link using a
1031 * single word shift register. In that case, @acnt would be equal to
1032 * that word size; the serial controller issues a DMA synchronization
1033 * event to transfer each word, and memory access by the DMA transfer
1034 * controller will be word-at-a-time.
1036 * An example of an AB-Synchronized transfer is a device using a FIFO.
1037 * In that case, @acnt equals the FIFO width and @bcnt equals its depth.
1038 * The controller with the FIFO issues DMA synchronization events when
1039 * the FIFO threshold is reached, and the DMA transfer controller will
1040 * transfer one frame to (or from) the FIFO. It will probably use
1041 * efficient burst modes to access memory.
1043 void edma_set_transfer_params(unsigned slot,
1044 u16 acnt, u16 bcnt, u16 ccnt,
1045 u16 bcnt_rld, enum sync_dimension sync_mode)
1049 ctlr = EDMA_CTLR(slot);
1050 slot = EDMA_CHAN_SLOT(slot);
1052 if (slot < edma_info[ctlr]->num_slots) {
1053 edma_parm_modify(ctlr, PARM_LINK_BCNTRLD, slot,
1054 0x0000ffff, bcnt_rld << 16);
1055 if (sync_mode == ASYNC)
1056 edma_parm_and(ctlr, PARM_OPT, slot, ~SYNCDIM);
1058 edma_parm_or(ctlr, PARM_OPT, slot, SYNCDIM);
1059 /* Set the acount, bcount, ccount registers */
1060 edma_parm_write(ctlr, PARM_A_B_CNT, slot, (bcnt << 16) | acnt);
1061 edma_parm_write(ctlr, PARM_CCNT, slot, ccnt);
1064 EXPORT_SYMBOL(edma_set_transfer_params);
1067 * edma_link - link one parameter RAM slot to another
1068 * @from: parameter RAM slot originating the link
1069 * @to: parameter RAM slot which is the link target
1071 * The originating slot should not be part of any active DMA transfer.
1073 void edma_link(unsigned from, unsigned to)
1075 unsigned ctlr_from, ctlr_to;
1077 ctlr_from = EDMA_CTLR(from);
1078 from = EDMA_CHAN_SLOT(from);
1079 ctlr_to = EDMA_CTLR(to);
1080 to = EDMA_CHAN_SLOT(to);
1082 if (from >= edma_info[ctlr_from]->num_slots)
1084 if (to >= edma_info[ctlr_to]->num_slots)
1086 edma_parm_modify(ctlr_from, PARM_LINK_BCNTRLD, from, 0xffff0000,
1089 EXPORT_SYMBOL(edma_link);
1092 * edma_unlink - cut link from one parameter RAM slot
1093 * @from: parameter RAM slot originating the link
1095 * The originating slot should not be part of any active DMA transfer.
1096 * Its link is set to 0xffff.
1098 void edma_unlink(unsigned from)
1102 ctlr = EDMA_CTLR(from);
1103 from = EDMA_CHAN_SLOT(from);
1105 if (from >= edma_info[ctlr]->num_slots)
1107 edma_parm_or(ctlr, PARM_LINK_BCNTRLD, from, 0xffff);
1109 EXPORT_SYMBOL(edma_unlink);
1111 /*-----------------------------------------------------------------------*/
1113 /* Parameter RAM operations (ii) -- read/write whole parameter sets */
1116 * edma_write_slot - write parameter RAM data for slot
1117 * @slot: number of parameter RAM slot being modified
1118 * @param: data to be written into parameter RAM slot
1120 * Use this to assign all parameters of a transfer at once. This
1121 * allows more efficient setup of transfers than issuing multiple
1122 * calls to set up those parameters in small pieces, and provides
1123 * complete control over all transfer options.
1125 void edma_write_slot(unsigned slot, const struct edmacc_param *param)
1129 ctlr = EDMA_CTLR(slot);
1130 slot = EDMA_CHAN_SLOT(slot);
1132 if (slot >= edma_info[ctlr]->num_slots)
1134 memcpy_toio(edmacc_regs_base[ctlr] + PARM_OFFSET(slot), param,
1137 EXPORT_SYMBOL(edma_write_slot);
1140 * edma_read_slot - read parameter RAM data from slot
1141 * @slot: number of parameter RAM slot being copied
1142 * @param: where to store copy of parameter RAM data
1144 * Use this to read data from a parameter RAM slot, perhaps to
1145 * save them as a template for later reuse.
1147 void edma_read_slot(unsigned slot, struct edmacc_param *param)
1151 ctlr = EDMA_CTLR(slot);
1152 slot = EDMA_CHAN_SLOT(slot);
1154 if (slot >= edma_info[ctlr]->num_slots)
1156 memcpy_fromio(param, edmacc_regs_base[ctlr] + PARM_OFFSET(slot),
1159 EXPORT_SYMBOL(edma_read_slot);
1161 /*-----------------------------------------------------------------------*/
1163 /* Various EDMA channel control operations */
1166 * edma_pause - pause dma on a channel
1167 * @channel: on which edma_start() has been called
1169 * This temporarily disables EDMA hardware events on the specified channel,
1170 * preventing them from triggering new transfers on its behalf
1172 void edma_pause(unsigned channel)
1176 ctlr = EDMA_CTLR(channel);
1177 channel = EDMA_CHAN_SLOT(channel);
1179 if (channel < edma_info[ctlr]->num_channels) {
1180 unsigned int mask = (1 << (channel & 0x1f));
1182 edma_shadow0_write_array(ctlr, SH_EECR, channel >> 5, mask);
1185 EXPORT_SYMBOL(edma_pause);
1188 * edma_resume - resumes dma on a paused channel
1189 * @channel: on which edma_pause() has been called
1191 * This re-enables EDMA hardware events on the specified channel.
1193 void edma_resume(unsigned channel)
1197 ctlr = EDMA_CTLR(channel);
1198 channel = EDMA_CHAN_SLOT(channel);
1200 if (channel < edma_info[ctlr]->num_channels) {
1201 unsigned int mask = (1 << (channel & 0x1f));
1203 edma_shadow0_write_array(ctlr, SH_EESR, channel >> 5, mask);
1206 EXPORT_SYMBOL(edma_resume);
1209 * edma_start - start dma on a channel
1210 * @channel: channel being activated
1212 * Channels with event associations will be triggered by their hardware
1213 * events, and channels without such associations will be triggered by
1214 * software. (At this writing there is no interface for using software
1215 * triggers except with channels that don't support hardware triggers.)
1217 * Returns zero on success, else negative errno.
1219 int edma_start(unsigned channel)
1223 ctlr = EDMA_CTLR(channel);
1224 channel = EDMA_CHAN_SLOT(channel);
1226 if (channel < edma_info[ctlr]->num_channels) {
1227 int j = channel >> 5;
1228 unsigned int mask = (1 << (channel & 0x1f));
1230 /* EDMA channels without event association */
1231 if (test_bit(channel, edma_info[ctlr]->edma_noevent)) {
1232 pr_debug("EDMA: ESR%d %08x\n", j,
1233 edma_shadow0_read_array(ctlr, SH_ESR, j));
1234 edma_shadow0_write_array(ctlr, SH_ESR, j, mask);
1238 /* EDMA channel with event association */
1239 pr_debug("EDMA: ER%d %08x\n", j,
1240 edma_shadow0_read_array(ctlr, SH_ER, j));
1241 /* Clear any pending error */
1242 edma_write_array(ctlr, EDMA_EMCR, j, mask);
1244 edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
1245 edma_shadow0_write_array(ctlr, SH_EESR, j, mask);
1246 pr_debug("EDMA: EER%d %08x\n", j,
1247 edma_shadow0_read_array(ctlr, SH_EER, j));
1253 EXPORT_SYMBOL(edma_start);
1256 * edma_stop - stops dma on the channel passed
1257 * @channel: channel being deactivated
1259 * When @lch is a channel, any active transfer is paused and
1260 * all pending hardware events are cleared. The current transfer
1261 * may not be resumed, and the channel's Parameter RAM should be
1262 * reinitialized before being reused.
1264 void edma_stop(unsigned channel)
1268 ctlr = EDMA_CTLR(channel);
1269 channel = EDMA_CHAN_SLOT(channel);
1271 if (channel < edma_info[ctlr]->num_channels) {
1272 int j = channel >> 5;
1273 unsigned int mask = (1 << (channel & 0x1f));
1275 edma_shadow0_write_array(ctlr, SH_EECR, j, mask);
1276 edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
1277 edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
1278 edma_write_array(ctlr, EDMA_EMCR, j, mask);
1280 pr_debug("EDMA: EER%d %08x\n", j,
1281 edma_shadow0_read_array(ctlr, SH_EER, j));
1283 /* REVISIT: consider guarding against inappropriate event
1284 * chaining by overwriting with dummy_paramset.
1288 EXPORT_SYMBOL(edma_stop);
1290 /******************************************************************************
1292 * It cleans ParamEntry qand bring back EDMA to initial state if media has
1293 * been removed before EDMA has finished.It is usedful for removable media.
1295 * ch_no - channel no
1297 * Return: zero on success, or corresponding error no on failure
1299 * FIXME this should not be needed ... edma_stop() should suffice.
1301 *****************************************************************************/
1303 void edma_clean_channel(unsigned channel)
1307 ctlr = EDMA_CTLR(channel);
1308 channel = EDMA_CHAN_SLOT(channel);
1310 if (channel < edma_info[ctlr]->num_channels) {
1311 int j = (channel >> 5);
1312 unsigned int mask = 1 << (channel & 0x1f);
1314 pr_debug("EDMA: EMR%d %08x\n", j,
1315 edma_read_array(ctlr, EDMA_EMR, j));
1316 edma_shadow0_write_array(ctlr, SH_ECR, j, mask);
1317 /* Clear the corresponding EMR bits */
1318 edma_write_array(ctlr, EDMA_EMCR, j, mask);
1320 edma_shadow0_write_array(ctlr, SH_SECR, j, mask);
1321 edma_write(ctlr, EDMA_CCERRCLR, (1 << 16) | 0x3);
1324 EXPORT_SYMBOL(edma_clean_channel);
1327 * edma_clear_event - clear an outstanding event on the DMA channel
1329 * channel - channel number
1331 void edma_clear_event(unsigned channel)
1335 ctlr = EDMA_CTLR(channel);
1336 channel = EDMA_CHAN_SLOT(channel);
1338 if (channel >= edma_info[ctlr]->num_channels)
1341 edma_write(ctlr, EDMA_ECR, 1 << channel);
1343 edma_write(ctlr, EDMA_ECRH, 1 << (channel - 32));
1345 EXPORT_SYMBOL(edma_clear_event);
1347 /*-----------------------------------------------------------------------*/
1349 static int __init edma_probe(struct platform_device *pdev)
1351 struct edma_soc_info *info = pdev->dev.platform_data;
1352 const s8 (*queue_priority_mapping)[2];
1353 const s8 (*queue_tc_mapping)[2];
1354 int i, j, found = 0;
1357 int irq[EDMA_MAX_CC] = {0, 0};
1358 int err_irq[EDMA_MAX_CC] = {0, 0};
1359 struct resource *r[EDMA_MAX_CC] = {NULL};
1360 resource_size_t len[EDMA_MAX_CC];
1367 for (j = 0; j < EDMA_MAX_CC; j++) {
1368 sprintf(res_name, "edma_cc%d", j);
1369 r[j] = platform_get_resource_byname(pdev, IORESOURCE_MEM,
1379 len[j] = resource_size(r[j]);
1381 r[j] = request_mem_region(r[j]->start, len[j],
1382 dev_name(&pdev->dev));
1388 edmacc_regs_base[j] = ioremap(r[j]->start, len[j]);
1389 if (!edmacc_regs_base[j]) {
1394 edma_info[j] = kmalloc(sizeof(struct edma), GFP_KERNEL);
1395 if (!edma_info[j]) {
1399 memset(edma_info[j], 0, sizeof(struct edma));
1401 edma_info[j]->num_channels = min_t(unsigned, info[j].n_channel,
1403 edma_info[j]->num_slots = min_t(unsigned, info[j].n_slot,
1404 EDMA_MAX_PARAMENTRY);
1405 edma_info[j]->num_cc = min_t(unsigned, info[j].n_cc,
1408 edma_info[j]->default_queue = info[j].default_queue;
1409 if (!edma_info[j]->default_queue)
1410 edma_info[j]->default_queue = EVENTQ_1;
1412 dev_dbg(&pdev->dev, "DMA REG BASE ADDR=%p\n",
1413 edmacc_regs_base[j]);
1415 for (i = 0; i < edma_info[j]->num_slots; i++)
1416 memcpy_toio(edmacc_regs_base[j] + PARM_OFFSET(i),
1417 &dummy_paramset, PARM_SIZE);
1419 noevent = info[j].noevent;
1421 while (*noevent != -1)
1422 set_bit(*noevent++, edma_info[j]->edma_noevent);
1425 sprintf(irq_name, "edma%d", j);
1426 irq[j] = platform_get_irq_byname(pdev, irq_name);
1427 edma_info[j]->irq_res_start = irq[j];
1428 status = request_irq(irq[j], dma_irq_handler, 0, "edma",
1431 dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
1436 sprintf(irq_name, "edma%d_err", j);
1437 err_irq[j] = platform_get_irq_byname(pdev, irq_name);
1438 edma_info[j]->irq_res_end = err_irq[j];
1439 status = request_irq(err_irq[j], dma_ccerr_handler, 0,
1440 "edma_error", &pdev->dev);
1442 dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
1443 err_irq[j], status);
1447 /* Everything lives on transfer controller 1 until otherwise
1448 * specified. This way, long transfers on the low priority queue
1449 * started by the codec engine will not cause audio defects.
1451 for (i = 0; i < edma_info[j]->num_channels; i++)
1452 map_dmach_queue(j, i, EVENTQ_1);
1454 queue_tc_mapping = info[j].queue_tc_mapping;
1455 queue_priority_mapping = info[j].queue_priority_mapping;
1457 /* Event queue to TC mapping */
1458 for (i = 0; queue_tc_mapping[i][0] != -1; i++)
1459 map_queue_tc(j, queue_tc_mapping[i][0],
1460 queue_tc_mapping[i][1]);
1462 /* Event queue priority mapping */
1463 for (i = 0; queue_priority_mapping[i][0] != -1; i++)
1464 assign_priority_to_queue(j,
1465 queue_priority_mapping[i][0],
1466 queue_priority_mapping[i][1]);
1468 /* Map the channel to param entry if channel mapping logic
1471 if (edma_read(j, EDMA_CCCFG) & CHMAP_EXIST)
1474 for (i = 0; i < info[j].n_region; i++) {
1475 edma_write_array2(j, EDMA_DRAE, i, 0, 0x0);
1476 edma_write_array2(j, EDMA_DRAE, i, 1, 0x0);
1477 edma_write_array(j, EDMA_QRAE, i, 0x0);
1481 if (tc_errs_handled) {
1482 status = request_irq(IRQ_TCERRINT0, dma_tc0err_handler, 0,
1483 "edma_tc0", &pdev->dev);
1485 dev_dbg(&pdev->dev, "request_irq %d failed --> %d\n",
1486 IRQ_TCERRINT0, status);
1489 status = request_irq(IRQ_TCERRINT, dma_tc1err_handler, 0,
1490 "edma_tc1", &pdev->dev);
1492 dev_dbg(&pdev->dev, "request_irq %d --> %d\n",
1493 IRQ_TCERRINT, status);
1501 for (i = 0; i < EDMA_MAX_CC; i++) {
1503 free_irq(err_irq[i], &pdev->dev);
1505 free_irq(irq[i], &pdev->dev);
1508 for (i = 0; i < EDMA_MAX_CC; i++) {
1510 release_mem_region(r[i]->start, len[i]);
1511 if (edmacc_regs_base[i])
1512 iounmap(edmacc_regs_base[i]);
1513 kfree(edma_info[i]);
1519 static struct platform_driver edma_driver = {
1520 .driver.name = "edma",
1523 static int __init edma_init(void)
1525 return platform_driver_probe(&edma_driver, edma_probe);
1527 arch_initcall(edma_init);