2 * linux/arch/arm/plat-omap/dma.c
4 * Copyright (C) 2003 - 2008 Nokia Corporation
5 * Author: Juha Yrjölä <juha.yrjola@nokia.com>
6 * DMA channel linking for 1610 by Samuel Ortiz <samuel.ortiz@nokia.com>
7 * Graphics DMA and LCD DMA graphics tranformations
8 * by Imre Deak <imre.deak@nokia.com>
9 * OMAP2/3 support Copyright (C) 2004-2007 Texas Instruments, Inc.
10 * Merged to support both OMAP1 and OMAP2 by Tony Lindgren <tony@atomide.com>
11 * Some functions based on earlier dma-omap.c Copyright (C) 2001 RidgeRun, Inc.
13 * Copyright (C) 2009 Texas Instruments
14 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com>
16 * Support functions for the OMAP internal DMA channels.
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License version 2 as
20 * published by the Free Software Foundation.
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/sched.h>
27 #include <linux/spinlock.h>
28 #include <linux/errno.h>
29 #include <linux/interrupt.h>
30 #include <linux/irq.h>
33 #include <asm/system.h>
34 #include <mach/hardware.h>
41 #ifndef CONFIG_ARCH_OMAP1
42 enum { DMA_CH_ALLOC_DONE, DMA_CH_PARAMS_SET_DONE, DMA_CH_STARTED,
43 DMA_CH_QUEUED, DMA_CH_NOTSTARTED, DMA_CH_PAUSED, DMA_CH_LINK_ENABLED
46 enum { DMA_CHAIN_STARTED, DMA_CHAIN_NOTSTARTED };
49 #define OMAP_DMA_ACTIVE 0x01
50 #define OMAP2_DMA_CSR_CLEAR_MASK 0xffe
52 #define OMAP_FUNC_MUX_ARM_BASE (0xfffe1000 + 0xec)
54 static int enable_1510_mode;
56 static struct omap_dma_global_context_registers {
58 u32 dma_ocp_sysconfig;
60 } omap_dma_global_context;
68 void (*callback)(int lch, u16 ch_status, void *data);
71 #ifndef CONFIG_ARCH_OMAP1
72 /* required for Dynamic chaining */
83 struct dma_link_info {
85 int no_of_lchs_linked;
96 static struct dma_link_info *dma_linked_lch;
98 #ifndef CONFIG_ARCH_OMAP1
100 /* Chain handling macros */
101 #define OMAP_DMA_CHAIN_QINIT(chain_id) \
103 dma_linked_lch[chain_id].q_head = \
104 dma_linked_lch[chain_id].q_tail = \
105 dma_linked_lch[chain_id].q_count = 0; \
107 #define OMAP_DMA_CHAIN_QFULL(chain_id) \
108 (dma_linked_lch[chain_id].no_of_lchs_linked == \
109 dma_linked_lch[chain_id].q_count)
110 #define OMAP_DMA_CHAIN_QLAST(chain_id) \
112 ((dma_linked_lch[chain_id].no_of_lchs_linked-1) == \
113 dma_linked_lch[chain_id].q_count) \
115 #define OMAP_DMA_CHAIN_QEMPTY(chain_id) \
116 (0 == dma_linked_lch[chain_id].q_count)
117 #define __OMAP_DMA_CHAIN_INCQ(end) \
118 ((end) = ((end)+1) % dma_linked_lch[chain_id].no_of_lchs_linked)
119 #define OMAP_DMA_CHAIN_INCQHEAD(chain_id) \
121 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_head); \
122 dma_linked_lch[chain_id].q_count--; \
125 #define OMAP_DMA_CHAIN_INCQTAIL(chain_id) \
127 __OMAP_DMA_CHAIN_INCQ(dma_linked_lch[chain_id].q_tail); \
128 dma_linked_lch[chain_id].q_count++; \
132 static int dma_lch_count;
133 static int dma_chan_count;
134 static int omap_dma_reserve_channels;
136 static spinlock_t dma_chan_lock;
137 static struct omap_dma_lch *dma_chan;
138 static void __iomem *omap_dma_base;
140 static const u8 omap1_dma_irq[OMAP1_LOGICAL_DMA_CH_COUNT] = {
141 INT_DMA_CH0_6, INT_DMA_CH1_7, INT_DMA_CH2_8, INT_DMA_CH3,
142 INT_DMA_CH4, INT_DMA_CH5, INT_1610_DMA_CH6, INT_1610_DMA_CH7,
143 INT_1610_DMA_CH8, INT_1610_DMA_CH9, INT_1610_DMA_CH10,
144 INT_1610_DMA_CH11, INT_1610_DMA_CH12, INT_1610_DMA_CH13,
145 INT_1610_DMA_CH14, INT_1610_DMA_CH15, INT_DMA_LCD
148 static inline void disable_lnk(int lch);
149 static void omap_disable_channel_irq(int lch);
150 static inline void omap_enable_channel_irq(int lch);
152 #define REVISIT_24XX() printk(KERN_ERR "FIXME: no %s on 24xx\n", \
155 #define dma_read(reg) \
158 if (cpu_class_is_omap1()) \
159 __val = __raw_readw(omap_dma_base + OMAP1_DMA_##reg); \
161 __val = __raw_readl(omap_dma_base + OMAP_DMA4_##reg); \
165 #define dma_write(val, reg) \
167 if (cpu_class_is_omap1()) \
168 __raw_writew((u16)(val), omap_dma_base + OMAP1_DMA_##reg); \
170 __raw_writel((val), omap_dma_base + OMAP_DMA4_##reg); \
173 #ifdef CONFIG_ARCH_OMAP15XX
174 /* Returns 1 if the DMA module is in OMAP1510-compatible mode, 0 otherwise */
175 int omap_dma_in_1510_mode(void)
177 return enable_1510_mode;
180 #define omap_dma_in_1510_mode() 0
183 #ifdef CONFIG_ARCH_OMAP1
184 static inline int get_gdma_dev(int req)
186 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
187 int shift = ((req - 1) % 5) * 6;
189 return ((omap_readl(reg) >> shift) & 0x3f) + 1;
192 static inline void set_gdma_dev(int req, int dev)
194 u32 reg = OMAP_FUNC_MUX_ARM_BASE + ((req - 1) / 5) * 4;
195 int shift = ((req - 1) % 5) * 6;
199 l &= ~(0x3f << shift);
200 l |= (dev - 1) << shift;
204 #define set_gdma_dev(req, dev) do {} while (0)
208 static void clear_lch_regs(int lch)
211 void __iomem *lch_base = omap_dma_base + OMAP1_DMA_CH_BASE(lch);
213 for (i = 0; i < 0x2c; i += 2)
214 __raw_writew(0, lch_base + i);
217 void omap_set_dma_priority(int lch, int dst_port, int priority)
222 if (cpu_class_is_omap1()) {
224 case OMAP_DMA_PORT_OCP_T1: /* FFFECC00 */
225 reg = OMAP_TC_OCPT1_PRIOR;
227 case OMAP_DMA_PORT_OCP_T2: /* FFFECCD0 */
228 reg = OMAP_TC_OCPT2_PRIOR;
230 case OMAP_DMA_PORT_EMIFF: /* FFFECC08 */
231 reg = OMAP_TC_EMIFF_PRIOR;
233 case OMAP_DMA_PORT_EMIFS: /* FFFECC04 */
234 reg = OMAP_TC_EMIFS_PRIOR;
242 l |= (priority & 0xf) << 8;
246 if (cpu_class_is_omap2()) {
249 ccr = dma_read(CCR(lch));
254 dma_write(ccr, CCR(lch));
257 EXPORT_SYMBOL(omap_set_dma_priority);
259 void omap_set_dma_transfer_params(int lch, int data_type, int elem_count,
260 int frame_count, int sync_mode,
261 int dma_trigger, int src_or_dst_synch)
265 l = dma_read(CSDP(lch));
268 dma_write(l, CSDP(lch));
270 if (cpu_class_is_omap1()) {
273 ccr = dma_read(CCR(lch));
275 if (sync_mode == OMAP_DMA_SYNC_FRAME)
277 dma_write(ccr, CCR(lch));
279 ccr = dma_read(CCR2(lch));
281 if (sync_mode == OMAP_DMA_SYNC_BLOCK)
283 dma_write(ccr, CCR2(lch));
286 if (cpu_class_is_omap2() && dma_trigger) {
289 val = dma_read(CCR(lch));
291 /* DMA_SYNCHRO_CONTROL_UPPER depends on the channel number */
292 val &= ~((3 << 19) | 0x1f);
293 val |= (dma_trigger & ~0x1f) << 14;
294 val |= dma_trigger & 0x1f;
296 if (sync_mode & OMAP_DMA_SYNC_FRAME)
301 if (sync_mode & OMAP_DMA_SYNC_BLOCK)
306 if (src_or_dst_synch)
307 val |= 1 << 24; /* source synch */
309 val &= ~(1 << 24); /* dest synch */
311 dma_write(val, CCR(lch));
314 dma_write(elem_count, CEN(lch));
315 dma_write(frame_count, CFN(lch));
317 EXPORT_SYMBOL(omap_set_dma_transfer_params);
319 void omap_set_dma_color_mode(int lch, enum omap_dma_color_mode mode, u32 color)
321 BUG_ON(omap_dma_in_1510_mode());
323 if (cpu_class_is_omap1()) {
326 w = dma_read(CCR2(lch));
330 case OMAP_DMA_CONSTANT_FILL:
333 case OMAP_DMA_TRANSPARENT_COPY:
336 case OMAP_DMA_COLOR_DIS:
341 dma_write(w, CCR2(lch));
343 w = dma_read(LCH_CTRL(lch));
345 /* Default is channel type 2D */
347 dma_write((u16)color, COLOR_L(lch));
348 dma_write((u16)(color >> 16), COLOR_U(lch));
349 w |= 1; /* Channel type G */
351 dma_write(w, LCH_CTRL(lch));
354 if (cpu_class_is_omap2()) {
357 val = dma_read(CCR(lch));
358 val &= ~((1 << 17) | (1 << 16));
361 case OMAP_DMA_CONSTANT_FILL:
364 case OMAP_DMA_TRANSPARENT_COPY:
367 case OMAP_DMA_COLOR_DIS:
372 dma_write(val, CCR(lch));
375 dma_write(color, COLOR(lch));
378 EXPORT_SYMBOL(omap_set_dma_color_mode);
380 void omap_set_dma_write_mode(int lch, enum omap_dma_write_mode mode)
382 if (cpu_class_is_omap2()) {
385 csdp = dma_read(CSDP(lch));
386 csdp &= ~(0x3 << 16);
387 csdp |= (mode << 16);
388 dma_write(csdp, CSDP(lch));
391 EXPORT_SYMBOL(omap_set_dma_write_mode);
393 void omap_set_dma_channel_mode(int lch, enum omap_dma_channel_mode mode)
395 if (cpu_class_is_omap1() && !cpu_is_omap15xx()) {
398 l = dma_read(LCH_CTRL(lch));
401 dma_write(l, LCH_CTRL(lch));
404 EXPORT_SYMBOL(omap_set_dma_channel_mode);
406 /* Note that src_port is only for omap1 */
407 void omap_set_dma_src_params(int lch, int src_port, int src_amode,
408 unsigned long src_start,
409 int src_ei, int src_fi)
413 if (cpu_class_is_omap1()) {
416 w = dma_read(CSDP(lch));
419 dma_write(w, CSDP(lch));
422 l = dma_read(CCR(lch));
424 l |= src_amode << 12;
425 dma_write(l, CCR(lch));
427 if (cpu_class_is_omap1()) {
428 dma_write(src_start >> 16, CSSA_U(lch));
429 dma_write((u16)src_start, CSSA_L(lch));
432 if (cpu_class_is_omap2())
433 dma_write(src_start, CSSA(lch));
435 dma_write(src_ei, CSEI(lch));
436 dma_write(src_fi, CSFI(lch));
438 EXPORT_SYMBOL(omap_set_dma_src_params);
440 void omap_set_dma_params(int lch, struct omap_dma_channel_params *params)
442 omap_set_dma_transfer_params(lch, params->data_type,
443 params->elem_count, params->frame_count,
444 params->sync_mode, params->trigger,
445 params->src_or_dst_synch);
446 omap_set_dma_src_params(lch, params->src_port,
447 params->src_amode, params->src_start,
448 params->src_ei, params->src_fi);
450 omap_set_dma_dest_params(lch, params->dst_port,
451 params->dst_amode, params->dst_start,
452 params->dst_ei, params->dst_fi);
453 if (params->read_prio || params->write_prio)
454 omap_dma_set_prio_lch(lch, params->read_prio,
457 EXPORT_SYMBOL(omap_set_dma_params);
459 void omap_set_dma_src_index(int lch, int eidx, int fidx)
461 if (cpu_class_is_omap2())
464 dma_write(eidx, CSEI(lch));
465 dma_write(fidx, CSFI(lch));
467 EXPORT_SYMBOL(omap_set_dma_src_index);
469 void omap_set_dma_src_data_pack(int lch, int enable)
473 l = dma_read(CSDP(lch));
477 dma_write(l, CSDP(lch));
479 EXPORT_SYMBOL(omap_set_dma_src_data_pack);
481 void omap_set_dma_src_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
483 unsigned int burst = 0;
486 l = dma_read(CSDP(lch));
489 switch (burst_mode) {
490 case OMAP_DMA_DATA_BURST_DIS:
492 case OMAP_DMA_DATA_BURST_4:
493 if (cpu_class_is_omap2())
498 case OMAP_DMA_DATA_BURST_8:
499 if (cpu_class_is_omap2()) {
503 /* not supported by current hardware on OMAP1
507 case OMAP_DMA_DATA_BURST_16:
508 if (cpu_class_is_omap2()) {
512 /* OMAP1 don't support burst 16
520 dma_write(l, CSDP(lch));
522 EXPORT_SYMBOL(omap_set_dma_src_burst_mode);
524 /* Note that dest_port is only for OMAP1 */
525 void omap_set_dma_dest_params(int lch, int dest_port, int dest_amode,
526 unsigned long dest_start,
527 int dst_ei, int dst_fi)
531 if (cpu_class_is_omap1()) {
532 l = dma_read(CSDP(lch));
535 dma_write(l, CSDP(lch));
538 l = dma_read(CCR(lch));
540 l |= dest_amode << 14;
541 dma_write(l, CCR(lch));
543 if (cpu_class_is_omap1()) {
544 dma_write(dest_start >> 16, CDSA_U(lch));
545 dma_write(dest_start, CDSA_L(lch));
548 if (cpu_class_is_omap2())
549 dma_write(dest_start, CDSA(lch));
551 dma_write(dst_ei, CDEI(lch));
552 dma_write(dst_fi, CDFI(lch));
554 EXPORT_SYMBOL(omap_set_dma_dest_params);
556 void omap_set_dma_dest_index(int lch, int eidx, int fidx)
558 if (cpu_class_is_omap2())
561 dma_write(eidx, CDEI(lch));
562 dma_write(fidx, CDFI(lch));
564 EXPORT_SYMBOL(omap_set_dma_dest_index);
566 void omap_set_dma_dest_data_pack(int lch, int enable)
570 l = dma_read(CSDP(lch));
574 dma_write(l, CSDP(lch));
576 EXPORT_SYMBOL(omap_set_dma_dest_data_pack);
578 void omap_set_dma_dest_burst_mode(int lch, enum omap_dma_burst_mode burst_mode)
580 unsigned int burst = 0;
583 l = dma_read(CSDP(lch));
586 switch (burst_mode) {
587 case OMAP_DMA_DATA_BURST_DIS:
589 case OMAP_DMA_DATA_BURST_4:
590 if (cpu_class_is_omap2())
595 case OMAP_DMA_DATA_BURST_8:
596 if (cpu_class_is_omap2())
601 case OMAP_DMA_DATA_BURST_16:
602 if (cpu_class_is_omap2()) {
606 /* OMAP1 don't support burst 16
610 printk(KERN_ERR "Invalid DMA burst mode\n");
615 dma_write(l, CSDP(lch));
617 EXPORT_SYMBOL(omap_set_dma_dest_burst_mode);
619 static inline void omap_enable_channel_irq(int lch)
624 if (cpu_class_is_omap1())
625 status = dma_read(CSR(lch));
626 else if (cpu_class_is_omap2())
627 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
629 /* Enable some nice interrupts. */
630 dma_write(dma_chan[lch].enabled_irqs, CICR(lch));
633 static void omap_disable_channel_irq(int lch)
635 if (cpu_class_is_omap2())
636 dma_write(0, CICR(lch));
639 void omap_enable_dma_irq(int lch, u16 bits)
641 dma_chan[lch].enabled_irqs |= bits;
643 EXPORT_SYMBOL(omap_enable_dma_irq);
645 void omap_disable_dma_irq(int lch, u16 bits)
647 dma_chan[lch].enabled_irqs &= ~bits;
649 EXPORT_SYMBOL(omap_disable_dma_irq);
651 static inline void enable_lnk(int lch)
655 l = dma_read(CLNK_CTRL(lch));
657 if (cpu_class_is_omap1())
660 /* Set the ENABLE_LNK bits */
661 if (dma_chan[lch].next_lch != -1)
662 l = dma_chan[lch].next_lch | (1 << 15);
664 #ifndef CONFIG_ARCH_OMAP1
665 if (cpu_class_is_omap2())
666 if (dma_chan[lch].next_linked_ch != -1)
667 l = dma_chan[lch].next_linked_ch | (1 << 15);
670 dma_write(l, CLNK_CTRL(lch));
673 static inline void disable_lnk(int lch)
677 l = dma_read(CLNK_CTRL(lch));
679 /* Disable interrupts */
680 if (cpu_class_is_omap1()) {
681 dma_write(0, CICR(lch));
682 /* Set the STOP_LNK bit */
686 if (cpu_class_is_omap2()) {
687 omap_disable_channel_irq(lch);
688 /* Clear the ENABLE_LNK bit */
692 dma_write(l, CLNK_CTRL(lch));
693 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
696 static inline void omap2_enable_irq_lch(int lch)
701 if (!cpu_class_is_omap2())
704 spin_lock_irqsave(&dma_chan_lock, flags);
705 val = dma_read(IRQENABLE_L0);
707 dma_write(val, IRQENABLE_L0);
708 spin_unlock_irqrestore(&dma_chan_lock, flags);
711 int omap_request_dma(int dev_id, const char *dev_name,
712 void (*callback)(int lch, u16 ch_status, void *data),
713 void *data, int *dma_ch_out)
715 int ch, free_ch = -1;
717 struct omap_dma_lch *chan;
719 spin_lock_irqsave(&dma_chan_lock, flags);
720 for (ch = 0; ch < dma_chan_count; ch++) {
721 if (free_ch == -1 && dma_chan[ch].dev_id == -1) {
728 spin_unlock_irqrestore(&dma_chan_lock, flags);
731 chan = dma_chan + free_ch;
732 chan->dev_id = dev_id;
734 if (cpu_class_is_omap1())
735 clear_lch_regs(free_ch);
737 if (cpu_class_is_omap2())
738 omap_clear_dma(free_ch);
740 spin_unlock_irqrestore(&dma_chan_lock, flags);
742 chan->dev_name = dev_name;
743 chan->callback = callback;
747 #ifndef CONFIG_ARCH_OMAP1
748 if (cpu_class_is_omap2()) {
750 chan->next_linked_ch = -1;
754 chan->enabled_irqs = OMAP_DMA_DROP_IRQ | OMAP_DMA_BLOCK_IRQ;
756 if (cpu_class_is_omap1())
757 chan->enabled_irqs |= OMAP1_DMA_TOUT_IRQ;
758 else if (cpu_class_is_omap2())
759 chan->enabled_irqs |= OMAP2_DMA_MISALIGNED_ERR_IRQ |
760 OMAP2_DMA_TRANS_ERR_IRQ;
762 if (cpu_is_omap16xx()) {
763 /* If the sync device is set, configure it dynamically. */
765 set_gdma_dev(free_ch + 1, dev_id);
766 dev_id = free_ch + 1;
769 * Disable the 1510 compatibility mode and set the sync device
772 dma_write(dev_id | (1 << 10), CCR(free_ch));
773 } else if (cpu_is_omap7xx() || cpu_is_omap15xx()) {
774 dma_write(dev_id, CCR(free_ch));
777 if (cpu_class_is_omap2()) {
778 omap2_enable_irq_lch(free_ch);
779 omap_enable_channel_irq(free_ch);
780 /* Clear the CSR register and IRQ status register */
781 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(free_ch));
782 dma_write(1 << free_ch, IRQSTATUS_L0);
785 *dma_ch_out = free_ch;
789 EXPORT_SYMBOL(omap_request_dma);
791 void omap_free_dma(int lch)
795 if (dma_chan[lch].dev_id == -1) {
796 pr_err("omap_dma: trying to free unallocated DMA channel %d\n",
801 if (cpu_class_is_omap1()) {
802 /* Disable all DMA interrupts for the channel. */
803 dma_write(0, CICR(lch));
804 /* Make sure the DMA transfer is stopped. */
805 dma_write(0, CCR(lch));
808 if (cpu_class_is_omap2()) {
811 spin_lock_irqsave(&dma_chan_lock, flags);
812 /* Disable interrupts */
813 val = dma_read(IRQENABLE_L0);
815 dma_write(val, IRQENABLE_L0);
816 spin_unlock_irqrestore(&dma_chan_lock, flags);
818 /* Clear the CSR register and IRQ status register */
819 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(lch));
820 dma_write(1 << lch, IRQSTATUS_L0);
822 /* Disable all DMA interrupts for the channel. */
823 dma_write(0, CICR(lch));
825 /* Make sure the DMA transfer is stopped. */
826 dma_write(0, CCR(lch));
830 spin_lock_irqsave(&dma_chan_lock, flags);
831 dma_chan[lch].dev_id = -1;
832 dma_chan[lch].next_lch = -1;
833 dma_chan[lch].callback = NULL;
834 spin_unlock_irqrestore(&dma_chan_lock, flags);
836 EXPORT_SYMBOL(omap_free_dma);
839 * @brief omap_dma_set_global_params : Set global priority settings for dma
842 * @param max_fifo_depth
843 * @param tparams - Number of threads to reserve : DMA_THREAD_RESERVE_NORM
844 * DMA_THREAD_RESERVE_ONET
845 * DMA_THREAD_RESERVE_TWOT
846 * DMA_THREAD_RESERVE_THREET
849 omap_dma_set_global_params(int arb_rate, int max_fifo_depth, int tparams)
853 if (!cpu_class_is_omap2()) {
854 printk(KERN_ERR "FIXME: no %s on 15xx/16xx\n", __func__);
858 if (max_fifo_depth == 0)
863 reg = 0xff & max_fifo_depth;
864 reg |= (0x3 & tparams) << 12;
865 reg |= (arb_rate & 0xff) << 16;
869 EXPORT_SYMBOL(omap_dma_set_global_params);
872 * @brief omap_dma_set_prio_lch : Set channel wise priority settings
875 * @param read_prio - Read priority
876 * @param write_prio - Write priority
877 * Both of the above can be set with one of the following values :
878 * DMA_CH_PRIO_HIGH/DMA_CH_PRIO_LOW
881 omap_dma_set_prio_lch(int lch, unsigned char read_prio,
882 unsigned char write_prio)
886 if (unlikely((lch < 0 || lch >= dma_lch_count))) {
887 printk(KERN_ERR "Invalid channel id\n");
890 l = dma_read(CCR(lch));
891 l &= ~((1 << 6) | (1 << 26));
892 if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx())
893 l |= ((read_prio & 0x1) << 6) | ((write_prio & 0x1) << 26);
895 l |= ((read_prio & 0x1) << 6);
897 dma_write(l, CCR(lch));
901 EXPORT_SYMBOL(omap_dma_set_prio_lch);
904 * Clears any DMA state so the DMA engine is ready to restart with new buffers
905 * through omap_start_dma(). Any buffers in flight are discarded.
907 void omap_clear_dma(int lch)
911 local_irq_save(flags);
913 if (cpu_class_is_omap1()) {
916 l = dma_read(CCR(lch));
917 l &= ~OMAP_DMA_CCR_EN;
918 dma_write(l, CCR(lch));
920 /* Clear pending interrupts */
921 l = dma_read(CSR(lch));
924 if (cpu_class_is_omap2()) {
926 void __iomem *lch_base = omap_dma_base + OMAP_DMA4_CH_BASE(lch);
927 for (i = 0; i < 0x44; i += 4)
928 __raw_writel(0, lch_base + i);
931 local_irq_restore(flags);
933 EXPORT_SYMBOL(omap_clear_dma);
935 void omap_start_dma(int lch)
940 * The CPC/CDAC register needs to be initialized to zero
941 * before starting dma transfer.
943 if (cpu_is_omap15xx())
944 dma_write(0, CPC(lch));
946 dma_write(0, CDAC(lch));
948 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
949 int next_lch, cur_lch;
950 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
952 dma_chan_link_map[lch] = 1;
953 /* Set the link register of the first channel */
956 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
957 cur_lch = dma_chan[lch].next_lch;
959 next_lch = dma_chan[cur_lch].next_lch;
961 /* The loop case: we've been here already */
962 if (dma_chan_link_map[cur_lch])
964 /* Mark the current channel */
965 dma_chan_link_map[cur_lch] = 1;
968 omap_enable_channel_irq(cur_lch);
971 } while (next_lch != -1);
972 } else if (cpu_is_omap242x() ||
973 (cpu_is_omap243x() && omap_type() <= OMAP2430_REV_ES1_0)) {
975 /* Errata: Need to write lch even if not using chaining */
976 dma_write(lch, CLNK_CTRL(lch));
979 omap_enable_channel_irq(lch);
981 l = dma_read(CCR(lch));
984 * Errata: On ES2.0 BUFFERING disable must be set.
985 * This will always fail on ES1.0
987 if (cpu_is_omap24xx())
988 l |= OMAP_DMA_CCR_EN;
990 l |= OMAP_DMA_CCR_EN;
991 dma_write(l, CCR(lch));
993 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
995 EXPORT_SYMBOL(omap_start_dma);
997 void omap_stop_dma(int lch)
1001 /* Disable all interrupts on the channel */
1002 if (cpu_class_is_omap1())
1003 dma_write(0, CICR(lch));
1005 l = dma_read(CCR(lch));
1006 l &= ~OMAP_DMA_CCR_EN;
1007 dma_write(l, CCR(lch));
1009 if (!omap_dma_in_1510_mode() && dma_chan[lch].next_lch != -1) {
1010 int next_lch, cur_lch = lch;
1011 char dma_chan_link_map[OMAP_DMA4_LOGICAL_DMA_CH_COUNT];
1013 memset(dma_chan_link_map, 0, sizeof(dma_chan_link_map));
1015 /* The loop case: we've been here already */
1016 if (dma_chan_link_map[cur_lch])
1018 /* Mark the current channel */
1019 dma_chan_link_map[cur_lch] = 1;
1021 disable_lnk(cur_lch);
1023 next_lch = dma_chan[cur_lch].next_lch;
1025 } while (next_lch != -1);
1028 dma_chan[lch].flags &= ~OMAP_DMA_ACTIVE;
1030 EXPORT_SYMBOL(omap_stop_dma);
1033 * Allows changing the DMA callback function or data. This may be needed if
1034 * the driver shares a single DMA channel for multiple dma triggers.
1036 int omap_set_dma_callback(int lch,
1037 void (*callback)(int lch, u16 ch_status, void *data),
1040 unsigned long flags;
1045 spin_lock_irqsave(&dma_chan_lock, flags);
1046 if (dma_chan[lch].dev_id == -1) {
1047 printk(KERN_ERR "DMA callback for not set for free channel\n");
1048 spin_unlock_irqrestore(&dma_chan_lock, flags);
1051 dma_chan[lch].callback = callback;
1052 dma_chan[lch].data = data;
1053 spin_unlock_irqrestore(&dma_chan_lock, flags);
1057 EXPORT_SYMBOL(omap_set_dma_callback);
1060 * Returns current physical source address for the given DMA channel.
1061 * If the channel is running the caller must disable interrupts prior calling
1062 * this function and process the returned value before re-enabling interrupt to
1063 * prevent races with the interrupt handler. Note that in continuous mode there
1064 * is a chance for CSSA_L register overflow inbetween the two reads resulting
1065 * in incorrect return value.
1067 dma_addr_t omap_get_dma_src_pos(int lch)
1069 dma_addr_t offset = 0;
1071 if (cpu_is_omap15xx())
1072 offset = dma_read(CPC(lch));
1074 offset = dma_read(CSAC(lch));
1077 * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1078 * read before the DMA controller finished disabling the channel.
1080 if (!cpu_is_omap15xx() && offset == 0)
1081 offset = dma_read(CSAC(lch));
1083 if (cpu_class_is_omap1())
1084 offset |= (dma_read(CSSA_U(lch)) << 16);
1088 EXPORT_SYMBOL(omap_get_dma_src_pos);
1091 * Returns current physical destination address for the given DMA channel.
1092 * If the channel is running the caller must disable interrupts prior calling
1093 * this function and process the returned value before re-enabling interrupt to
1094 * prevent races with the interrupt handler. Note that in continuous mode there
1095 * is a chance for CDSA_L register overflow inbetween the two reads resulting
1096 * in incorrect return value.
1098 dma_addr_t omap_get_dma_dst_pos(int lch)
1100 dma_addr_t offset = 0;
1102 if (cpu_is_omap15xx())
1103 offset = dma_read(CPC(lch));
1105 offset = dma_read(CDAC(lch));
1108 * omap 3.2/3.3 erratum: sometimes 0 is returned if CSAC/CDAC is
1109 * read before the DMA controller finished disabling the channel.
1111 if (!cpu_is_omap15xx() && offset == 0)
1112 offset = dma_read(CDAC(lch));
1114 if (cpu_class_is_omap1())
1115 offset |= (dma_read(CDSA_U(lch)) << 16);
1119 EXPORT_SYMBOL(omap_get_dma_dst_pos);
1121 int omap_get_dma_active_status(int lch)
1123 return (dma_read(CCR(lch)) & OMAP_DMA_CCR_EN) != 0;
1125 EXPORT_SYMBOL(omap_get_dma_active_status);
1127 int omap_dma_running(void)
1131 if (cpu_class_is_omap1())
1132 if (omap_lcd_dma_running())
1135 for (lch = 0; lch < dma_chan_count; lch++)
1136 if (dma_read(CCR(lch)) & OMAP_DMA_CCR_EN)
1143 * lch_queue DMA will start right after lch_head one is finished.
1144 * For this DMA link to start, you still need to start (see omap_start_dma)
1145 * the first one. That will fire up the entire queue.
1147 void omap_dma_link_lch(int lch_head, int lch_queue)
1149 if (omap_dma_in_1510_mode()) {
1150 if (lch_head == lch_queue) {
1151 dma_write(dma_read(CCR(lch_head)) | (3 << 8),
1155 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1160 if ((dma_chan[lch_head].dev_id == -1) ||
1161 (dma_chan[lch_queue].dev_id == -1)) {
1162 printk(KERN_ERR "omap_dma: trying to link "
1163 "non requested channels\n");
1167 dma_chan[lch_head].next_lch = lch_queue;
1169 EXPORT_SYMBOL(omap_dma_link_lch);
1172 * Once the DMA queue is stopped, we can destroy it.
1174 void omap_dma_unlink_lch(int lch_head, int lch_queue)
1176 if (omap_dma_in_1510_mode()) {
1177 if (lch_head == lch_queue) {
1178 dma_write(dma_read(CCR(lch_head)) & ~(3 << 8),
1182 printk(KERN_ERR "DMA linking is not supported in 1510 mode\n");
1187 if (dma_chan[lch_head].next_lch != lch_queue ||
1188 dma_chan[lch_head].next_lch == -1) {
1189 printk(KERN_ERR "omap_dma: trying to unlink "
1190 "non linked channels\n");
1194 if ((dma_chan[lch_head].flags & OMAP_DMA_ACTIVE) ||
1195 (dma_chan[lch_queue].flags & OMAP_DMA_ACTIVE)) {
1196 printk(KERN_ERR "omap_dma: You need to stop the DMA channels "
1197 "before unlinking\n");
1201 dma_chan[lch_head].next_lch = -1;
1203 EXPORT_SYMBOL(omap_dma_unlink_lch);
1205 /*----------------------------------------------------------------------------*/
1207 #ifndef CONFIG_ARCH_OMAP1
1208 /* Create chain of DMA channesls */
1209 static void create_dma_lch_chain(int lch_head, int lch_queue)
1213 /* Check if this is the first link in chain */
1214 if (dma_chan[lch_head].next_linked_ch == -1) {
1215 dma_chan[lch_head].next_linked_ch = lch_queue;
1216 dma_chan[lch_head].prev_linked_ch = lch_queue;
1217 dma_chan[lch_queue].next_linked_ch = lch_head;
1218 dma_chan[lch_queue].prev_linked_ch = lch_head;
1221 /* a link exists, link the new channel in circular chain */
1223 dma_chan[lch_queue].next_linked_ch =
1224 dma_chan[lch_head].next_linked_ch;
1225 dma_chan[lch_queue].prev_linked_ch = lch_head;
1226 dma_chan[lch_head].next_linked_ch = lch_queue;
1227 dma_chan[dma_chan[lch_queue].next_linked_ch].prev_linked_ch =
1231 l = dma_read(CLNK_CTRL(lch_head));
1234 dma_write(l, CLNK_CTRL(lch_head));
1236 l = dma_read(CLNK_CTRL(lch_queue));
1238 l |= (dma_chan[lch_queue].next_linked_ch);
1239 dma_write(l, CLNK_CTRL(lch_queue));
1243 * @brief omap_request_dma_chain : Request a chain of DMA channels
1245 * @param dev_id - Device id using the dma channel
1246 * @param dev_name - Device name
1247 * @param callback - Call back function
1249 * @no_of_chans - Number of channels requested
1250 * @chain_mode - Dynamic or static chaining : OMAP_DMA_STATIC_CHAIN
1251 * OMAP_DMA_DYNAMIC_CHAIN
1252 * @params - Channel parameters
1254 * @return - Success : 0
1255 * Failure: -EINVAL/-ENOMEM
1257 int omap_request_dma_chain(int dev_id, const char *dev_name,
1258 void (*callback) (int lch, u16 ch_status,
1260 int *chain_id, int no_of_chans, int chain_mode,
1261 struct omap_dma_channel_params params)
1266 /* Is the chain mode valid ? */
1267 if (chain_mode != OMAP_DMA_STATIC_CHAIN
1268 && chain_mode != OMAP_DMA_DYNAMIC_CHAIN) {
1269 printk(KERN_ERR "Invalid chain mode requested\n");
1273 if (unlikely((no_of_chans < 1
1274 || no_of_chans > dma_lch_count))) {
1275 printk(KERN_ERR "Invalid Number of channels requested\n");
1279 /* Allocate a queue to maintain the status of the channels
1281 channels = kmalloc(sizeof(*channels) * no_of_chans, GFP_KERNEL);
1282 if (channels == NULL) {
1283 printk(KERN_ERR "omap_dma: No memory for channel queue\n");
1287 /* request and reserve DMA channels for the chain */
1288 for (i = 0; i < no_of_chans; i++) {
1289 err = omap_request_dma(dev_id, dev_name,
1290 callback, NULL, &channels[i]);
1293 for (j = 0; j < i; j++)
1294 omap_free_dma(channels[j]);
1296 printk(KERN_ERR "omap_dma: Request failed %d\n", err);
1299 dma_chan[channels[i]].prev_linked_ch = -1;
1300 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1303 * Allowing client drivers to set common parameters now,
1304 * so that later only relevant (src_start, dest_start
1305 * and element count) can be set
1307 omap_set_dma_params(channels[i], ¶ms);
1310 *chain_id = channels[0];
1311 dma_linked_lch[*chain_id].linked_dmach_q = channels;
1312 dma_linked_lch[*chain_id].chain_mode = chain_mode;
1313 dma_linked_lch[*chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1314 dma_linked_lch[*chain_id].no_of_lchs_linked = no_of_chans;
1316 for (i = 0; i < no_of_chans; i++)
1317 dma_chan[channels[i]].chain_id = *chain_id;
1319 /* Reset the Queue pointers */
1320 OMAP_DMA_CHAIN_QINIT(*chain_id);
1322 /* Set up the chain */
1323 if (no_of_chans == 1)
1324 create_dma_lch_chain(channels[0], channels[0]);
1326 for (i = 0; i < (no_of_chans - 1); i++)
1327 create_dma_lch_chain(channels[i], channels[i + 1]);
1332 EXPORT_SYMBOL(omap_request_dma_chain);
1335 * @brief omap_modify_dma_chain_param : Modify the chain's params - Modify the
1336 * params after setting it. Dont do this while dma is running!!
1338 * @param chain_id - Chained logical channel id.
1341 * @return - Success : 0
1344 int omap_modify_dma_chain_params(int chain_id,
1345 struct omap_dma_channel_params params)
1350 /* Check for input params */
1351 if (unlikely((chain_id < 0
1352 || chain_id >= dma_lch_count))) {
1353 printk(KERN_ERR "Invalid chain id\n");
1357 /* Check if the chain exists */
1358 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1359 printk(KERN_ERR "Chain doesn't exists\n");
1362 channels = dma_linked_lch[chain_id].linked_dmach_q;
1364 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1366 * Allowing client drivers to set common parameters now,
1367 * so that later only relevant (src_start, dest_start
1368 * and element count) can be set
1370 omap_set_dma_params(channels[i], ¶ms);
1375 EXPORT_SYMBOL(omap_modify_dma_chain_params);
1378 * @brief omap_free_dma_chain - Free all the logical channels in a chain.
1382 * @return - Success : 0
1385 int omap_free_dma_chain(int chain_id)
1390 /* Check for input params */
1391 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1392 printk(KERN_ERR "Invalid chain id\n");
1396 /* Check if the chain exists */
1397 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1398 printk(KERN_ERR "Chain doesn't exists\n");
1402 channels = dma_linked_lch[chain_id].linked_dmach_q;
1403 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1404 dma_chan[channels[i]].next_linked_ch = -1;
1405 dma_chan[channels[i]].prev_linked_ch = -1;
1406 dma_chan[channels[i]].chain_id = -1;
1407 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1408 omap_free_dma(channels[i]);
1413 dma_linked_lch[chain_id].linked_dmach_q = NULL;
1414 dma_linked_lch[chain_id].chain_mode = -1;
1415 dma_linked_lch[chain_id].chain_state = -1;
1419 EXPORT_SYMBOL(omap_free_dma_chain);
1422 * @brief omap_dma_chain_status - Check if the chain is in
1423 * active / inactive state.
1426 * @return - Success : OMAP_DMA_CHAIN_ACTIVE/OMAP_DMA_CHAIN_INACTIVE
1429 int omap_dma_chain_status(int chain_id)
1431 /* Check for input params */
1432 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1433 printk(KERN_ERR "Invalid chain id\n");
1437 /* Check if the chain exists */
1438 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1439 printk(KERN_ERR "Chain doesn't exists\n");
1442 pr_debug("CHAINID=%d, qcnt=%d\n", chain_id,
1443 dma_linked_lch[chain_id].q_count);
1445 if (OMAP_DMA_CHAIN_QEMPTY(chain_id))
1446 return OMAP_DMA_CHAIN_INACTIVE;
1448 return OMAP_DMA_CHAIN_ACTIVE;
1450 EXPORT_SYMBOL(omap_dma_chain_status);
1453 * @brief omap_dma_chain_a_transfer - Get a free channel from a chain,
1454 * set the params and start the transfer.
1457 * @param src_start - buffer start address
1458 * @param dest_start - Dest address
1460 * @param frame_count
1461 * @param callbk_data - channel callback parameter data.
1463 * @return - Success : 0
1464 * Failure: -EINVAL/-EBUSY
1466 int omap_dma_chain_a_transfer(int chain_id, int src_start, int dest_start,
1467 int elem_count, int frame_count, void *callbk_data)
1474 * if buffer size is less than 1 then there is
1475 * no use of starting the chain
1477 if (elem_count < 1) {
1478 printk(KERN_ERR "Invalid buffer size\n");
1482 /* Check for input params */
1483 if (unlikely((chain_id < 0
1484 || chain_id >= dma_lch_count))) {
1485 printk(KERN_ERR "Invalid chain id\n");
1489 /* Check if the chain exists */
1490 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1491 printk(KERN_ERR "Chain doesn't exist\n");
1495 /* Check if all the channels in chain are in use */
1496 if (OMAP_DMA_CHAIN_QFULL(chain_id))
1499 /* Frame count may be negative in case of indexed transfers */
1500 channels = dma_linked_lch[chain_id].linked_dmach_q;
1502 /* Get a free channel */
1503 lch = channels[dma_linked_lch[chain_id].q_tail];
1505 /* Store the callback data */
1506 dma_chan[lch].data = callbk_data;
1508 /* Increment the q_tail */
1509 OMAP_DMA_CHAIN_INCQTAIL(chain_id);
1511 /* Set the params to the free channel */
1513 dma_write(src_start, CSSA(lch));
1514 if (dest_start != 0)
1515 dma_write(dest_start, CDSA(lch));
1517 /* Write the buffer size */
1518 dma_write(elem_count, CEN(lch));
1519 dma_write(frame_count, CFN(lch));
1522 * If the chain is dynamically linked,
1523 * then we may have to start the chain if its not active
1525 if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_DYNAMIC_CHAIN) {
1528 * In Dynamic chain, if the chain is not started,
1531 if (dma_linked_lch[chain_id].chain_state ==
1532 DMA_CHAIN_NOTSTARTED) {
1533 /* Enable the link in previous channel */
1534 if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1536 enable_lnk(dma_chan[lch].prev_linked_ch);
1537 dma_chan[lch].state = DMA_CH_QUEUED;
1541 * Chain is already started, make sure its active,
1542 * if not then start the chain
1547 if (dma_chan[dma_chan[lch].prev_linked_ch].state ==
1549 enable_lnk(dma_chan[lch].prev_linked_ch);
1550 dma_chan[lch].state = DMA_CH_QUEUED;
1552 if (0 == ((1 << 7) & dma_read(
1553 CCR(dma_chan[lch].prev_linked_ch)))) {
1554 disable_lnk(dma_chan[lch].
1556 pr_debug("\n prev ch is stopped\n");
1561 else if (dma_chan[dma_chan[lch].prev_linked_ch].state
1563 enable_lnk(dma_chan[lch].prev_linked_ch);
1564 dma_chan[lch].state = DMA_CH_QUEUED;
1567 omap_enable_channel_irq(lch);
1569 l = dma_read(CCR(lch));
1571 if ((0 == (l & (1 << 24))))
1575 if (start_dma == 1) {
1576 if (0 == (l & (1 << 7))) {
1578 dma_chan[lch].state = DMA_CH_STARTED;
1579 pr_debug("starting %d\n", lch);
1580 dma_write(l, CCR(lch));
1584 if (0 == (l & (1 << 7)))
1585 dma_write(l, CCR(lch));
1587 dma_chan[lch].flags |= OMAP_DMA_ACTIVE;
1593 EXPORT_SYMBOL(omap_dma_chain_a_transfer);
1596 * @brief omap_start_dma_chain_transfers - Start the chain
1600 * @return - Success : 0
1601 * Failure : -EINVAL/-EBUSY
1603 int omap_start_dma_chain_transfers(int chain_id)
1608 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1609 printk(KERN_ERR "Invalid chain id\n");
1613 channels = dma_linked_lch[chain_id].linked_dmach_q;
1615 if (dma_linked_lch[channels[0]].chain_state == DMA_CHAIN_STARTED) {
1616 printk(KERN_ERR "Chain is already started\n");
1620 if (dma_linked_lch[chain_id].chain_mode == OMAP_DMA_STATIC_CHAIN) {
1621 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked;
1623 enable_lnk(channels[i]);
1624 omap_enable_channel_irq(channels[i]);
1627 omap_enable_channel_irq(channels[0]);
1630 l = dma_read(CCR(channels[0]));
1632 dma_linked_lch[chain_id].chain_state = DMA_CHAIN_STARTED;
1633 dma_chan[channels[0]].state = DMA_CH_STARTED;
1635 if ((0 == (l & (1 << 24))))
1639 dma_write(l, CCR(channels[0]));
1641 dma_chan[channels[0]].flags |= OMAP_DMA_ACTIVE;
1645 EXPORT_SYMBOL(omap_start_dma_chain_transfers);
1648 * @brief omap_stop_dma_chain_transfers - Stop the dma transfer of a chain.
1652 * @return - Success : 0
1655 int omap_stop_dma_chain_transfers(int chain_id)
1661 /* Check for input params */
1662 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1663 printk(KERN_ERR "Invalid chain id\n");
1667 /* Check if the chain exists */
1668 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1669 printk(KERN_ERR "Chain doesn't exists\n");
1672 channels = dma_linked_lch[chain_id].linked_dmach_q;
1676 * Special programming model needed to disable DMA before end of block
1678 sys_cf = dma_read(OCP_SYSCONFIG);
1680 /* Middle mode reg set no Standby */
1681 l &= ~((1 << 12)|(1 << 13));
1682 dma_write(l, OCP_SYSCONFIG);
1684 for (i = 0; i < dma_linked_lch[chain_id].no_of_lchs_linked; i++) {
1686 /* Stop the Channel transmission */
1687 l = dma_read(CCR(channels[i]));
1689 dma_write(l, CCR(channels[i]));
1691 /* Disable the link in all the channels */
1692 disable_lnk(channels[i]);
1693 dma_chan[channels[i]].state = DMA_CH_NOTSTARTED;
1696 dma_linked_lch[chain_id].chain_state = DMA_CHAIN_NOTSTARTED;
1698 /* Reset the Queue pointers */
1699 OMAP_DMA_CHAIN_QINIT(chain_id);
1701 /* Errata - put in the old value */
1702 dma_write(sys_cf, OCP_SYSCONFIG);
1706 EXPORT_SYMBOL(omap_stop_dma_chain_transfers);
1708 /* Get the index of the ongoing DMA in chain */
1710 * @brief omap_get_dma_chain_index - Get the element and frame index
1711 * of the ongoing DMA in chain
1714 * @param ei - Element index
1715 * @param fi - Frame index
1717 * @return - Success : 0
1720 int omap_get_dma_chain_index(int chain_id, int *ei, int *fi)
1725 /* Check for input params */
1726 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1727 printk(KERN_ERR "Invalid chain id\n");
1731 /* Check if the chain exists */
1732 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1733 printk(KERN_ERR "Chain doesn't exists\n");
1739 channels = dma_linked_lch[chain_id].linked_dmach_q;
1741 /* Get the current channel */
1742 lch = channels[dma_linked_lch[chain_id].q_head];
1744 *ei = dma_read(CCEN(lch));
1745 *fi = dma_read(CCFN(lch));
1749 EXPORT_SYMBOL(omap_get_dma_chain_index);
1752 * @brief omap_get_dma_chain_dst_pos - Get the destination position of the
1753 * ongoing DMA in chain
1757 * @return - Success : Destination position
1760 int omap_get_dma_chain_dst_pos(int chain_id)
1765 /* Check for input params */
1766 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1767 printk(KERN_ERR "Invalid chain id\n");
1771 /* Check if the chain exists */
1772 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1773 printk(KERN_ERR "Chain doesn't exists\n");
1777 channels = dma_linked_lch[chain_id].linked_dmach_q;
1779 /* Get the current channel */
1780 lch = channels[dma_linked_lch[chain_id].q_head];
1782 return dma_read(CDAC(lch));
1784 EXPORT_SYMBOL(omap_get_dma_chain_dst_pos);
1787 * @brief omap_get_dma_chain_src_pos - Get the source position
1788 * of the ongoing DMA in chain
1791 * @return - Success : Destination position
1794 int omap_get_dma_chain_src_pos(int chain_id)
1799 /* Check for input params */
1800 if (unlikely((chain_id < 0 || chain_id >= dma_lch_count))) {
1801 printk(KERN_ERR "Invalid chain id\n");
1805 /* Check if the chain exists */
1806 if (dma_linked_lch[chain_id].linked_dmach_q == NULL) {
1807 printk(KERN_ERR "Chain doesn't exists\n");
1811 channels = dma_linked_lch[chain_id].linked_dmach_q;
1813 /* Get the current channel */
1814 lch = channels[dma_linked_lch[chain_id].q_head];
1816 return dma_read(CSAC(lch));
1818 EXPORT_SYMBOL(omap_get_dma_chain_src_pos);
1819 #endif /* ifndef CONFIG_ARCH_OMAP1 */
1821 /*----------------------------------------------------------------------------*/
1823 #ifdef CONFIG_ARCH_OMAP1
1825 static int omap1_dma_handle_ch(int ch)
1829 if (enable_1510_mode && ch >= 6) {
1830 csr = dma_chan[ch].saved_csr;
1831 dma_chan[ch].saved_csr = 0;
1833 csr = dma_read(CSR(ch));
1834 if (enable_1510_mode && ch <= 2 && (csr >> 7) != 0) {
1835 dma_chan[ch + 6].saved_csr = csr >> 7;
1838 if ((csr & 0x3f) == 0)
1840 if (unlikely(dma_chan[ch].dev_id == -1)) {
1841 printk(KERN_WARNING "Spurious interrupt from DMA channel "
1842 "%d (CSR %04x)\n", ch, csr);
1845 if (unlikely(csr & OMAP1_DMA_TOUT_IRQ))
1846 printk(KERN_WARNING "DMA timeout with device %d\n",
1847 dma_chan[ch].dev_id);
1848 if (unlikely(csr & OMAP_DMA_DROP_IRQ))
1849 printk(KERN_WARNING "DMA synchronization event drop occurred "
1850 "with device %d\n", dma_chan[ch].dev_id);
1851 if (likely(csr & OMAP_DMA_BLOCK_IRQ))
1852 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1853 if (likely(dma_chan[ch].callback != NULL))
1854 dma_chan[ch].callback(ch, csr, dma_chan[ch].data);
1859 static irqreturn_t omap1_dma_irq_handler(int irq, void *dev_id)
1861 int ch = ((int) dev_id) - 1;
1865 int handled_now = 0;
1867 handled_now += omap1_dma_handle_ch(ch);
1868 if (enable_1510_mode && dma_chan[ch + 6].saved_csr)
1869 handled_now += omap1_dma_handle_ch(ch + 6);
1872 handled += handled_now;
1875 return handled ? IRQ_HANDLED : IRQ_NONE;
1879 #define omap1_dma_irq_handler NULL
1882 #ifdef CONFIG_ARCH_OMAP2PLUS
1884 static int omap2_dma_handle_ch(int ch)
1886 u32 status = dma_read(CSR(ch));
1889 if (printk_ratelimit())
1890 printk(KERN_WARNING "Spurious DMA IRQ for lch %d\n",
1892 dma_write(1 << ch, IRQSTATUS_L0);
1895 if (unlikely(dma_chan[ch].dev_id == -1)) {
1896 if (printk_ratelimit())
1897 printk(KERN_WARNING "IRQ %04x for non-allocated DMA"
1898 "channel %d\n", status, ch);
1901 if (unlikely(status & OMAP_DMA_DROP_IRQ))
1903 "DMA synchronization event drop occurred with device "
1904 "%d\n", dma_chan[ch].dev_id);
1905 if (unlikely(status & OMAP2_DMA_TRANS_ERR_IRQ)) {
1906 printk(KERN_INFO "DMA transaction error with device %d\n",
1907 dma_chan[ch].dev_id);
1908 if (cpu_class_is_omap2()) {
1909 /* Errata: sDMA Channel is not disabled
1910 * after a transaction error. So we explicitely
1911 * disable the channel
1915 ccr = dma_read(CCR(ch));
1916 ccr &= ~OMAP_DMA_CCR_EN;
1917 dma_write(ccr, CCR(ch));
1918 dma_chan[ch].flags &= ~OMAP_DMA_ACTIVE;
1921 if (unlikely(status & OMAP2_DMA_SECURE_ERR_IRQ))
1922 printk(KERN_INFO "DMA secure error with device %d\n",
1923 dma_chan[ch].dev_id);
1924 if (unlikely(status & OMAP2_DMA_MISALIGNED_ERR_IRQ))
1925 printk(KERN_INFO "DMA misaligned error with device %d\n",
1926 dma_chan[ch].dev_id);
1928 dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch));
1929 dma_write(1 << ch, IRQSTATUS_L0);
1931 /* If the ch is not chained then chain_id will be -1 */
1932 if (dma_chan[ch].chain_id != -1) {
1933 int chain_id = dma_chan[ch].chain_id;
1934 dma_chan[ch].state = DMA_CH_NOTSTARTED;
1935 if (dma_read(CLNK_CTRL(ch)) & (1 << 15))
1936 dma_chan[dma_chan[ch].next_linked_ch].state =
1938 if (dma_linked_lch[chain_id].chain_mode ==
1939 OMAP_DMA_DYNAMIC_CHAIN)
1942 if (!OMAP_DMA_CHAIN_QEMPTY(chain_id))
1943 OMAP_DMA_CHAIN_INCQHEAD(chain_id);
1945 status = dma_read(CSR(ch));
1948 dma_write(status, CSR(ch));
1950 if (likely(dma_chan[ch].callback != NULL))
1951 dma_chan[ch].callback(ch, status, dma_chan[ch].data);
1956 /* STATUS register count is from 1-32 while our is 0-31 */
1957 static irqreturn_t omap2_dma_irq_handler(int irq, void *dev_id)
1959 u32 val, enable_reg;
1962 val = dma_read(IRQSTATUS_L0);
1964 if (printk_ratelimit())
1965 printk(KERN_WARNING "Spurious DMA IRQ\n");
1968 enable_reg = dma_read(IRQENABLE_L0);
1969 val &= enable_reg; /* Dispatch only relevant interrupts */
1970 for (i = 0; i < dma_lch_count && val != 0; i++) {
1972 omap2_dma_handle_ch(i);
1979 static struct irqaction omap24xx_dma_irq = {
1981 .handler = omap2_dma_irq_handler,
1982 .flags = IRQF_DISABLED
1986 static struct irqaction omap24xx_dma_irq;
1989 /*----------------------------------------------------------------------------*/
1991 void omap_dma_global_context_save(void)
1993 omap_dma_global_context.dma_irqenable_l0 =
1994 dma_read(IRQENABLE_L0);
1995 omap_dma_global_context.dma_ocp_sysconfig =
1996 dma_read(OCP_SYSCONFIG);
1997 omap_dma_global_context.dma_gcr = dma_read(GCR);
2000 void omap_dma_global_context_restore(void)
2004 dma_write(omap_dma_global_context.dma_gcr, GCR);
2005 dma_write(omap_dma_global_context.dma_ocp_sysconfig,
2007 dma_write(omap_dma_global_context.dma_irqenable_l0,
2011 * A bug in ROM code leaves IRQ status for channels 0 and 1 uncleared
2012 * after secure sram context save and restore. Hence we need to
2013 * manually clear those IRQs to avoid spurious interrupts. This
2014 * affects only secure devices.
2016 if (cpu_is_omap34xx() && (omap_type() != OMAP2_DEVICE_TYPE_GP))
2017 dma_write(0x3 , IRQSTATUS_L0);
2019 for (ch = 0; ch < dma_chan_count; ch++)
2020 if (dma_chan[ch].dev_id != -1)
2024 /*----------------------------------------------------------------------------*/
2026 static int __init omap_init_dma(void)
2031 if (cpu_class_is_omap1()) {
2032 base = OMAP1_DMA_BASE;
2033 dma_lch_count = OMAP1_LOGICAL_DMA_CH_COUNT;
2034 } else if (cpu_is_omap24xx()) {
2035 base = OMAP24XX_DMA4_BASE;
2036 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2037 } else if (cpu_is_omap34xx()) {
2038 base = OMAP34XX_DMA4_BASE;
2039 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2040 } else if (cpu_is_omap44xx()) {
2041 base = OMAP44XX_DMA4_BASE;
2042 dma_lch_count = OMAP_DMA4_LOGICAL_DMA_CH_COUNT;
2044 pr_err("DMA init failed for unsupported omap\n");
2048 omap_dma_base = ioremap(base, SZ_4K);
2049 BUG_ON(!omap_dma_base);
2051 if (cpu_class_is_omap2() && omap_dma_reserve_channels
2052 && (omap_dma_reserve_channels <= dma_lch_count))
2053 dma_lch_count = omap_dma_reserve_channels;
2055 dma_chan = kzalloc(sizeof(struct omap_dma_lch) * dma_lch_count,
2062 if (cpu_class_is_omap2()) {
2063 dma_linked_lch = kzalloc(sizeof(struct dma_link_info) *
2064 dma_lch_count, GFP_KERNEL);
2065 if (!dma_linked_lch) {
2071 if (cpu_is_omap15xx()) {
2072 printk(KERN_INFO "DMA support for OMAP15xx initialized\n");
2074 enable_1510_mode = 1;
2075 } else if (cpu_is_omap16xx() || cpu_is_omap7xx()) {
2076 printk(KERN_INFO "OMAP DMA hardware version %d\n",
2078 printk(KERN_INFO "DMA capabilities: %08x:%08x:%04x:%04x:%04x\n",
2079 (dma_read(CAPS_0_U) << 16) |
2081 (dma_read(CAPS_1_U) << 16) |
2083 dma_read(CAPS_2), dma_read(CAPS_3),
2085 if (!enable_1510_mode) {
2088 /* Disable OMAP 3.0/3.1 compatibility mode. */
2092 dma_chan_count = 16;
2095 } else if (cpu_class_is_omap2()) {
2096 u8 revision = dma_read(REVISION) & 0xff;
2097 printk(KERN_INFO "OMAP DMA hardware revision %d.%d\n",
2098 revision >> 4, revision & 0xf);
2099 dma_chan_count = dma_lch_count;
2105 spin_lock_init(&dma_chan_lock);
2107 for (ch = 0; ch < dma_chan_count; ch++) {
2109 dma_chan[ch].dev_id = -1;
2110 dma_chan[ch].next_lch = -1;
2112 if (ch >= 6 && enable_1510_mode)
2115 if (cpu_class_is_omap1()) {
2117 * request_irq() doesn't like dev_id (ie. ch) being
2118 * zero, so we have to kludge around this.
2120 r = request_irq(omap1_dma_irq[ch],
2121 omap1_dma_irq_handler, 0, "DMA",
2126 printk(KERN_ERR "unable to request IRQ %d "
2127 "for DMA (error %d)\n",
2128 omap1_dma_irq[ch], r);
2129 for (i = 0; i < ch; i++)
2130 free_irq(omap1_dma_irq[i],
2137 if (cpu_is_omap2430() || cpu_is_omap34xx() || cpu_is_omap44xx())
2138 omap_dma_set_global_params(DMA_DEFAULT_ARB_RATE,
2139 DMA_DEFAULT_FIFO_DEPTH, 0);
2141 if (cpu_class_is_omap2()) {
2143 if (cpu_is_omap44xx())
2144 irq = OMAP44XX_IRQ_SDMA_0;
2146 irq = INT_24XX_SDMA_IRQ0;
2147 setup_irq(irq, &omap24xx_dma_irq);
2150 if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
2151 /* Enable smartidle idlemodes and autoidle */
2152 u32 v = dma_read(OCP_SYSCONFIG);
2153 v &= ~(DMA_SYSCONFIG_MIDLEMODE_MASK |
2154 DMA_SYSCONFIG_SIDLEMODE_MASK |
2155 DMA_SYSCONFIG_AUTOIDLE);
2156 v |= (DMA_SYSCONFIG_MIDLEMODE(DMA_IDLEMODE_SMARTIDLE) |
2157 DMA_SYSCONFIG_SIDLEMODE(DMA_IDLEMODE_SMARTIDLE) |
2158 DMA_SYSCONFIG_AUTOIDLE);
2159 dma_write(v , OCP_SYSCONFIG);
2160 /* reserve dma channels 0 and 1 in high security devices */
2161 if (cpu_is_omap34xx() &&
2162 (omap_type() != OMAP2_DEVICE_TYPE_GP)) {
2163 printk(KERN_INFO "Reserving DMA channels 0 and 1 for "
2165 dma_chan[0].dev_id = 0;
2166 dma_chan[1].dev_id = 1;
2176 iounmap(omap_dma_base);
2181 arch_initcall(omap_init_dma);
2184 * Reserve the omap SDMA channels using cmdline bootarg
2185 * "omap_dma_reserve_ch=". The valid range is 1 to 32
2187 static int __init omap_dma_cmdline_reserve_ch(char *str)
2189 if (get_option(&str, &omap_dma_reserve_channels) != 1)
2190 omap_dma_reserve_channels = 0;
2194 __setup("omap_dma_reserve_ch=", omap_dma_cmdline_reserve_ch);