drivers/dma/dw-edma/dw-edma-v0-core.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates.
  * Synopsys DesignWare eDMA v0 core
  *
  * Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
  */

 #include <linux/bitfield.h>

 #include "dw-edma-core.h"
 #include "dw-edma-v0-core.h"
 #include "dw-edma-v0-regs.h"
 #include "dw-edma-v0-debugfs.h"

 enum dw_edma_control {
 	DW_EDMA_V0_CB					= BIT(0),
 	DW_EDMA_V0_TCB					= BIT(1),
 	DW_EDMA_V0_LLP					= BIT(2),
 	DW_EDMA_V0_LIE					= BIT(3),
 	DW_EDMA_V0_RIE					= BIT(4),
 	DW_EDMA_V0_CCS					= BIT(8),
 	DW_EDMA_V0_LLE					= BIT(9),
 };

 static inline struct dw_edma_v0_regs __iomem *__dw_regs(struct dw_edma *dw)
 {
 	return (struct dw_edma_v0_regs __iomem *)dw->rg_region.vaddr;
 }

 #define SET(dw, name, value)				\
 	writel(value, &(__dw_regs(dw)->name))

 #define GET(dw, name)					\
 	readl(&(__dw_regs(dw)->name))

 #define SET_RW(dw, dir, name, value)			\
 	do {						\
 		if ((dir) == EDMA_DIR_WRITE)		\
 			SET(dw, wr_##name, value);	\
 		else					\
 			SET(dw, rd_##name, value);	\
 	} while (0)

 #define GET_RW(dw, dir, name)				\
 	((dir) == EDMA_DIR_WRITE			\
 	  ? GET(dw, wr_##name)				\
 	  : GET(dw, rd_##name))

 #define SET_BOTH(dw, name, value)			\
 	do {						\
 		SET(dw, wr_##name, value);		\
 		SET(dw, rd_##name, value);		\
 	} while (0)

 static inline struct dw_edma_v0_ch_regs __iomem *
 __dw_ch_regs(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch)
 {
 	if (dw->mode == EDMA_MODE_LEGACY)
 		return &(__dw_regs(dw)->type.legacy.ch);

 	if (dir == EDMA_DIR_WRITE)
 		return &__dw_regs(dw)->type.unroll.ch[ch].wr;

 	return &__dw_regs(dw)->type.unroll.ch[ch].rd;
 }

 static inline void writel_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
 			     u32 value, void __iomem *addr)
 {
 	if (dw->mode == EDMA_MODE_LEGACY) {
 		u32 viewport_sel;
 		unsigned long flags;

 		raw_spin_lock_irqsave(&dw->lock, flags);

 		viewport_sel = FIELD_PREP(EDMA_V0_VIEWPORT_MASK, ch);
 		if (dir == EDMA_DIR_READ)
 			viewport_sel |= BIT(31);

 		writel(viewport_sel,
 		       &(__dw_regs(dw)->type.legacy.viewport_sel));
 		writel(value, addr);

 		raw_spin_unlock_irqrestore(&dw->lock, flags);
 	} else {
 		writel(value, addr);
 	}
 }

 static inline u32 readl_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
 			   const void __iomem *addr)
 {
 	u32 value;

 	if (dw->mode == EDMA_MODE_LEGACY) {
 		u32 viewport_sel;
 		unsigned long flags;

 		raw_spin_lock_irqsave(&dw->lock, flags);

 		viewport_sel = FIELD_PREP(EDMA_V0_VIEWPORT_MASK, ch);
 		if (dir == EDMA_DIR_READ)
 			viewport_sel |= BIT(31);

 		writel(viewport_sel,
 		       &(__dw_regs(dw)->type.legacy.viewport_sel));
 		value = readl(addr);

 		raw_spin_unlock_irqrestore(&dw->lock, flags);
 	} else {
 		value = readl(addr);
 	}

 	return value;
 }

 #define SET_CH(dw, dir, ch, name, value) \
 	writel_ch(dw, dir, ch, value, &(__dw_ch_regs(dw, dir, ch)->name))

 #define GET_CH(dw, dir, ch, name) \
 	readl_ch(dw, dir, ch, &(__dw_ch_regs(dw, dir, ch)->name))

 #define SET_LL(ll, value) \
 	writel(value, ll)

 /* eDMA management callbacks */
 void dw_edma_v0_core_off(struct dw_edma *dw)
 {
 	SET_BOTH(dw, int_mask, EDMA_V0_DONE_INT_MASK | EDMA_V0_ABORT_INT_MASK);
 	SET_BOTH(dw, int_clear, EDMA_V0_DONE_INT_MASK | EDMA_V0_ABORT_INT_MASK);
 	SET_BOTH(dw, engine_en, 0);
 }

 u16 dw_edma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir)
 {
 	u32 num_ch;

 	if (dir == EDMA_DIR_WRITE)
 		num_ch = FIELD_GET(EDMA_V0_WRITE_CH_COUNT_MASK, GET(dw, ctrl));
 	else
 		num_ch = FIELD_GET(EDMA_V0_READ_CH_COUNT_MASK, GET(dw, ctrl));

 	if (num_ch > EDMA_V0_MAX_NR_CH)
 		num_ch = EDMA_V0_MAX_NR_CH;

 	return (u16)num_ch;
 }

 enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan)
 {
 	struct dw_edma *dw = chan->chip->dw;
 	u32 tmp;

 	tmp = FIELD_GET(EDMA_V0_CH_STATUS_MASK,
 			GET_CH(dw, chan->dir, chan->id, ch_control1));

 	if (tmp == 1)
 		return DMA_IN_PROGRESS;
 	else if (tmp == 3)
 		return DMA_COMPLETE;
 	else
 		return DMA_ERROR;
 }

 void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan)
 {
 	struct dw_edma *dw = chan->chip->dw;

 	SET_RW(dw, chan->dir, int_clear,
 	       FIELD_PREP(EDMA_V0_DONE_INT_MASK, BIT(chan->id)));
 }

 void dw_edma_v0_core_clear_abort_int(struct dw_edma_chan *chan)
 {
 	struct dw_edma *dw = chan->chip->dw;

 	SET_RW(dw, chan->dir, int_clear,
 	       FIELD_PREP(EDMA_V0_ABORT_INT_MASK, BIT(chan->id)));
 }

 u32 dw_edma_v0_core_status_done_int(struct dw_edma *dw, enum dw_edma_dir dir)
 {
 	return FIELD_GET(EDMA_V0_DONE_INT_MASK, GET_RW(dw, dir, int_status));
 }

 u32 dw_edma_v0_core_status_abort_int(struct dw_edma *dw, enum dw_edma_dir dir)
 {
 	return FIELD_GET(EDMA_V0_ABORT_INT_MASK, GET_RW(dw, dir, int_status));
 }

 static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
 {
 	struct dw_edma_burst *child;
 	struct dw_edma_v0_lli *lli;
 	struct dw_edma_v0_llp *llp;
 	u32 control = 0, i = 0;
 	u64 sar, dar, addr;
 	int j;

 	lli = (struct dw_edma_v0_lli *)chunk->ll_region.vaddr;

 	if (chunk->cb)
 		control = DW_EDMA_V0_CB;

 	j = chunk->bursts_alloc;
 	list_for_each_entry(child, &chunk->burst->list, list) {
 		j--;
 		if (!j)
 			control |= (DW_EDMA_V0_LIE | DW_EDMA_V0_RIE);

 		/* Channel control */
 		SET_LL(&lli[i].control, control);
 		/* Transfer size */
 		SET_LL(&lli[i].transfer_size, child->sz);
 		/* SAR - low, high */
 		sar = cpu_to_le64(child->sar);
 		SET_LL(&lli[i].sar_low, lower_32_bits(sar));
 		SET_LL(&lli[i].sar_high, upper_32_bits(sar));
 		/* DAR - low, high */
 		dar = cpu_to_le64(child->dar);
 		SET_LL(&lli[i].dar_low, lower_32_bits(dar));
 		SET_LL(&lli[i].dar_high, upper_32_bits(dar));
 		i++;
 	}

 	llp = (struct dw_edma_v0_llp *)&lli[i];
 	control = DW_EDMA_V0_LLP | DW_EDMA_V0_TCB;
 	if (!chunk->cb)
 		control |= DW_EDMA_V0_CB;

 	/* Channel control */
 	SET_LL(&llp->control, control);
 	/* Linked list  - low, high */
 	addr = cpu_to_le64(chunk->ll_region.paddr);
 	SET_LL(&llp->llp_low, lower_32_bits(addr));
 	SET_LL(&llp->llp_high, upper_32_bits(addr));
 }

 void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
 {
 	struct dw_edma_chan *chan = chunk->chan;
 	struct dw_edma *dw = chan->chip->dw;
 	u32 tmp;
 	u64 llp;

 	dw_edma_v0_core_write_chunk(chunk);

 	if (first) {
 		/* Enable engine */
 		SET_RW(dw, chan->dir, engine_en, BIT(0));
 		/* Interrupt unmask - done, abort */
 		tmp = GET_RW(dw, chan->dir, int_mask);
 		tmp &= ~FIELD_PREP(EDMA_V0_DONE_INT_MASK, BIT(chan->id));
 		tmp &= ~FIELD_PREP(EDMA_V0_ABORT_INT_MASK, BIT(chan->id));
 		SET_RW(dw, chan->dir, int_mask, tmp);
 		/* Linked list error */
 		tmp = GET_RW(dw, chan->dir, linked_list_err_en);
 		tmp |= FIELD_PREP(EDMA_V0_LINKED_LIST_ERR_MASK, BIT(chan->id));
 		SET_RW(dw, chan->dir, linked_list_err_en, tmp);
 		/* Channel control */
 		SET_CH(dw, chan->dir, chan->id, ch_control1,
 		       (DW_EDMA_V0_CCS | DW_EDMA_V0_LLE));
 		/* Linked list - low, high */
 		llp = cpu_to_le64(chunk->ll_region.paddr);
 		SET_CH(dw, chan->dir, chan->id, llp_low, lower_32_bits(llp));
 		SET_CH(dw, chan->dir, chan->id, llp_high, upper_32_bits(llp));
 	}
 	/* Doorbell */
 	SET_RW(dw, chan->dir, doorbell,
 	       FIELD_PREP(EDMA_V0_DOORBELL_CH_MASK, chan->id));
 }

 int dw_edma_v0_core_device_config(struct dw_edma_chan *chan)
 {
 	struct dw_edma *dw = chan->chip->dw;
 	u32 tmp = 0;

 	/* MSI done addr - low, high */
 	SET_RW(dw, chan->dir, done_imwr_low, chan->msi.address_lo);
 	SET_RW(dw, chan->dir, done_imwr_high, chan->msi.address_hi);
 	/* MSI abort addr - low, high */
 	SET_RW(dw, chan->dir, abort_imwr_low, chan->msi.address_lo);
 	SET_RW(dw, chan->dir, abort_imwr_high, chan->msi.address_hi);
 	/* MSI data - low, high */
 	switch (chan->id) {
 	case 0:
 	case 1:
 		tmp = GET_RW(dw, chan->dir, ch01_imwr_data);
 		break;

 	case 2:
 	case 3:
 		tmp = GET_RW(dw, chan->dir, ch23_imwr_data);
 		break;

 	case 4:
 	case 5:
 		tmp = GET_RW(dw, chan->dir, ch45_imwr_data);
 		break;

 	case 6:
 	case 7:
 		tmp = GET_RW(dw, chan->dir, ch67_imwr_data);
 		break;
 	}

 	if (chan->id & BIT(0)) {
 		/* Channel odd {1, 3, 5, 7} */
 		tmp &= EDMA_V0_CH_EVEN_MSI_DATA_MASK;
 		tmp |= FIELD_PREP(EDMA_V0_CH_ODD_MSI_DATA_MASK,
 				  chan->msi.data);
 	} else {
 		/* Channel even {0, 2, 4, 6} */
 		tmp &= EDMA_V0_CH_ODD_MSI_DATA_MASK;
 		tmp |= FIELD_PREP(EDMA_V0_CH_EVEN_MSI_DATA_MASK,
 				  chan->msi.data);
 	}

 	switch (chan->id) {
 	case 0:
 	case 1:
 		SET_RW(dw, chan->dir, ch01_imwr_data, tmp);
 		break;

 	case 2:
 	case 3:
 		SET_RW(dw, chan->dir, ch23_imwr_data, tmp);
 		break;

 	case 4:
 	case 5:
 		SET_RW(dw, chan->dir, ch45_imwr_data, tmp);
 		break;

 	case 6:
 	case 7:
 		SET_RW(dw, chan->dir, ch67_imwr_data, tmp);
 		break;
 	}

 	return 0;
 }

 /* eDMA debugfs callbacks */
 void dw_edma_v0_core_debugfs_on(struct dw_edma_chip *chip)
 {
 	dw_edma_v0_debugfs_on(chip);
 }

 void dw_edma_v0_core_debugfs_off(void)
 {
 	dw_edma_v0_debugfs_off();
 }
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (c) 2018-2019 Synopsys, Inc. and/or its affiliates.
	* Synopsys DesignWare eDMA v0 core
	*
	* Author: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
	*/

	#include <linux/bitfield.h>

	#include "dw-edma-core.h"
	#include "dw-edma-v0-core.h"
	#include "dw-edma-v0-regs.h"
	#include "dw-edma-v0-debugfs.h"

	enum dw_edma_control {
	DW_EDMA_V0_CB = BIT(0),
	DW_EDMA_V0_TCB = BIT(1),
	DW_EDMA_V0_LLP = BIT(2),
	DW_EDMA_V0_LIE = BIT(3),
	DW_EDMA_V0_RIE = BIT(4),
	DW_EDMA_V0_CCS = BIT(8),
	DW_EDMA_V0_LLE = BIT(9),
	};

	static inline struct dw_edma_v0_regs __iomem __dw_regs(struct dw_edma dw)
	{
	return (struct dw_edma_v0_regs __iomem *)dw->rg_region.vaddr;
	}

	#define SET(dw, name, value) \
	writel(value, &(__dw_regs(dw)->name))

	#define GET(dw, name) \
	readl(&(__dw_regs(dw)->name))

	#define SET_RW(dw, dir, name, value) \
	do { \
	if ((dir) == EDMA_DIR_WRITE) \
	SET(dw, wr_##name, value); \
	else \
	SET(dw, rd_##name, value); \
	} while (0)

	#define GET_RW(dw, dir, name) \
	((dir) == EDMA_DIR_WRITE \
	? GET(dw, wr_##name) \
	: GET(dw, rd_##name))

	#define SET_BOTH(dw, name, value) \
	do { \
	SET(dw, wr_##name, value); \
	SET(dw, rd_##name, value); \
	} while (0)

	static inline struct dw_edma_v0_ch_regs __iomem *
	__dw_ch_regs(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch)
	{
	if (dw->mode == EDMA_MODE_LEGACY)
	return &(__dw_regs(dw)->type.legacy.ch);

	if (dir == EDMA_DIR_WRITE)
	return &__dw_regs(dw)->type.unroll.ch[ch].wr;

	return &__dw_regs(dw)->type.unroll.ch[ch].rd;
	}

	static inline void writel_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
	u32 value, void __iomem *addr)
	{
	if (dw->mode == EDMA_MODE_LEGACY) {
	u32 viewport_sel;
	unsigned long flags;

	raw_spin_lock_irqsave(&dw->lock, flags);

	viewport_sel = FIELD_PREP(EDMA_V0_VIEWPORT_MASK, ch);
	if (dir == EDMA_DIR_READ)
	viewport_sel \|= BIT(31);

	writel(viewport_sel,
	&(__dw_regs(dw)->type.legacy.viewport_sel));
	writel(value, addr);

	raw_spin_unlock_irqrestore(&dw->lock, flags);
	} else {
	writel(value, addr);
	}
	}

	static inline u32 readl_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
	const void __iomem *addr)
	{
	u32 value;

	if (dw->mode == EDMA_MODE_LEGACY) {
	u32 viewport_sel;
	unsigned long flags;

	raw_spin_lock_irqsave(&dw->lock, flags);

	viewport_sel = FIELD_PREP(EDMA_V0_VIEWPORT_MASK, ch);
	if (dir == EDMA_DIR_READ)
	viewport_sel \|= BIT(31);

	writel(viewport_sel,
	&(__dw_regs(dw)->type.legacy.viewport_sel));
	value = readl(addr);

	raw_spin_unlock_irqrestore(&dw->lock, flags);
	} else {
	value = readl(addr);
	}

	return value;
	}

	#define SET_CH(dw, dir, ch, name, value) \
	writel_ch(dw, dir, ch, value, &(__dw_ch_regs(dw, dir, ch)->name))

	#define GET_CH(dw, dir, ch, name) \
	readl_ch(dw, dir, ch, &(__dw_ch_regs(dw, dir, ch)->name))

	#define SET_LL(ll, value) \
	writel(value, ll)

	/* eDMA management callbacks */
	void dw_edma_v0_core_off(struct dw_edma *dw)
	{
	SET_BOTH(dw, int_mask, EDMA_V0_DONE_INT_MASK \| EDMA_V0_ABORT_INT_MASK);
	SET_BOTH(dw, int_clear, EDMA_V0_DONE_INT_MASK \| EDMA_V0_ABORT_INT_MASK);
	SET_BOTH(dw, engine_en, 0);
	}

	u16 dw_edma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir)
	{
	u32 num_ch;

	if (dir == EDMA_DIR_WRITE)
	num_ch = FIELD_GET(EDMA_V0_WRITE_CH_COUNT_MASK, GET(dw, ctrl));
	else
	num_ch = FIELD_GET(EDMA_V0_READ_CH_COUNT_MASK, GET(dw, ctrl));

	if (num_ch > EDMA_V0_MAX_NR_CH)
	num_ch = EDMA_V0_MAX_NR_CH;

	return (u16)num_ch;
	}

	enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan)
	{
	struct dw_edma *dw = chan->chip->dw;
	u32 tmp;

	tmp = FIELD_GET(EDMA_V0_CH_STATUS_MASK,
	GET_CH(dw, chan->dir, chan->id, ch_control1));

	if (tmp == 1)
	return DMA_IN_PROGRESS;
	else if (tmp == 3)
	return DMA_COMPLETE;
	else
	return DMA_ERROR;
	}

	void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan)
	{
	struct dw_edma *dw = chan->chip->dw;

	SET_RW(dw, chan->dir, int_clear,
	FIELD_PREP(EDMA_V0_DONE_INT_MASK, BIT(chan->id)));
	}

	void dw_edma_v0_core_clear_abort_int(struct dw_edma_chan *chan)
	{
	struct dw_edma *dw = chan->chip->dw;

	SET_RW(dw, chan->dir, int_clear,
	FIELD_PREP(EDMA_V0_ABORT_INT_MASK, BIT(chan->id)));
	}

	u32 dw_edma_v0_core_status_done_int(struct dw_edma *dw, enum dw_edma_dir dir)
	{
	return FIELD_GET(EDMA_V0_DONE_INT_MASK, GET_RW(dw, dir, int_status));
	}

	u32 dw_edma_v0_core_status_abort_int(struct dw_edma *dw, enum dw_edma_dir dir)
	{
	return FIELD_GET(EDMA_V0_ABORT_INT_MASK, GET_RW(dw, dir, int_status));
	}

	static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
	{
	struct dw_edma_burst *child;
	struct dw_edma_v0_lli *lli;
	struct dw_edma_v0_llp *llp;
	u32 control = 0, i = 0;
	u64 sar, dar, addr;
	int j;

	lli = (struct dw_edma_v0_lli *)chunk->ll_region.vaddr;

	if (chunk->cb)
	control = DW_EDMA_V0_CB;

	j = chunk->bursts_alloc;
	list_for_each_entry(child, &chunk->burst->list, list) {
	j--;
	if (!j)
	control \|= (DW_EDMA_V0_LIE \| DW_EDMA_V0_RIE);

	/* Channel control */
	SET_LL(&lli[i].control, control);
	/* Transfer size */
	SET_LL(&lli[i].transfer_size, child->sz);
	/* SAR - low, high */
	sar = cpu_to_le64(child->sar);
	SET_LL(&lli[i].sar_low, lower_32_bits(sar));
	SET_LL(&lli[i].sar_high, upper_32_bits(sar));
	/* DAR - low, high */
	dar = cpu_to_le64(child->dar);
	SET_LL(&lli[i].dar_low, lower_32_bits(dar));
	SET_LL(&lli[i].dar_high, upper_32_bits(dar));
	i++;
	}

	llp = (struct dw_edma_v0_llp *)&lli[i];
	control = DW_EDMA_V0_LLP \| DW_EDMA_V0_TCB;
	if (!chunk->cb)
	control \|= DW_EDMA_V0_CB;

	/* Channel control */
	SET_LL(&llp->control, control);
	/* Linked list - low, high */
	addr = cpu_to_le64(chunk->ll_region.paddr);
	SET_LL(&llp->llp_low, lower_32_bits(addr));
	SET_LL(&llp->llp_high, upper_32_bits(addr));
	}

	void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
	{
	struct dw_edma_chan *chan = chunk->chan;
	struct dw_edma *dw = chan->chip->dw;
	u32 tmp;
	u64 llp;

	dw_edma_v0_core_write_chunk(chunk);

	if (first) {
	/* Enable engine */
	SET_RW(dw, chan->dir, engine_en, BIT(0));
	/* Interrupt unmask - done, abort */
	tmp = GET_RW(dw, chan->dir, int_mask);
	tmp &= ~FIELD_PREP(EDMA_V0_DONE_INT_MASK, BIT(chan->id));
	tmp &= ~FIELD_PREP(EDMA_V0_ABORT_INT_MASK, BIT(chan->id));
	SET_RW(dw, chan->dir, int_mask, tmp);
	/* Linked list error */
	tmp = GET_RW(dw, chan->dir, linked_list_err_en);
	tmp \|= FIELD_PREP(EDMA_V0_LINKED_LIST_ERR_MASK, BIT(chan->id));
	SET_RW(dw, chan->dir, linked_list_err_en, tmp);
	/* Channel control */
	SET_CH(dw, chan->dir, chan->id, ch_control1,
	(DW_EDMA_V0_CCS \| DW_EDMA_V0_LLE));
	/* Linked list - low, high */
	llp = cpu_to_le64(chunk->ll_region.paddr);
	SET_CH(dw, chan->dir, chan->id, llp_low, lower_32_bits(llp));
	SET_CH(dw, chan->dir, chan->id, llp_high, upper_32_bits(llp));
	}
	/* Doorbell */
	SET_RW(dw, chan->dir, doorbell,
	FIELD_PREP(EDMA_V0_DOORBELL_CH_MASK, chan->id));
	}

	int dw_edma_v0_core_device_config(struct dw_edma_chan *chan)
	{
	struct dw_edma *dw = chan->chip->dw;
	u32 tmp = 0;

	/* MSI done addr - low, high */
	SET_RW(dw, chan->dir, done_imwr_low, chan->msi.address_lo);
	SET_RW(dw, chan->dir, done_imwr_high, chan->msi.address_hi);
	/* MSI abort addr - low, high */
	SET_RW(dw, chan->dir, abort_imwr_low, chan->msi.address_lo);
	SET_RW(dw, chan->dir, abort_imwr_high, chan->msi.address_hi);
	/* MSI data - low, high */
	switch (chan->id) {
	case 0:
	case 1:
	tmp = GET_RW(dw, chan->dir, ch01_imwr_data);
	break;

	case 2:
	case 3:
	tmp = GET_RW(dw, chan->dir, ch23_imwr_data);
	break;

	case 4:
	case 5:
	tmp = GET_RW(dw, chan->dir, ch45_imwr_data);
	break;

	case 6:
	case 7:
	tmp = GET_RW(dw, chan->dir, ch67_imwr_data);
	break;
	}

	if (chan->id & BIT(0)) {
	/* Channel odd {1, 3, 5, 7} */
	tmp &= EDMA_V0_CH_EVEN_MSI_DATA_MASK;
	tmp \|= FIELD_PREP(EDMA_V0_CH_ODD_MSI_DATA_MASK,
	chan->msi.data);
	} else {
	/* Channel even {0, 2, 4, 6} */
	tmp &= EDMA_V0_CH_ODD_MSI_DATA_MASK;
	tmp \|= FIELD_PREP(EDMA_V0_CH_EVEN_MSI_DATA_MASK,
	chan->msi.data);
	}

	switch (chan->id) {
	case 0:
	case 1:
	SET_RW(dw, chan->dir, ch01_imwr_data, tmp);
	break;

	case 2:
	case 3:
	SET_RW(dw, chan->dir, ch23_imwr_data, tmp);
	break;

	case 4:
	case 5:
	SET_RW(dw, chan->dir, ch45_imwr_data, tmp);
	break;

	case 6:
	case 7:
	SET_RW(dw, chan->dir, ch67_imwr_data, tmp);
	break;
	}

	return 0;
	}

	/* eDMA debugfs callbacks */
	void dw_edma_v0_core_debugfs_on(struct dw_edma_chip *chip)
	{
	dw_edma_v0_debugfs_on(chip);
	}

	void dw_edma_v0_core_debugfs_off(void)
	{
	dw_edma_v0_debugfs_off();
	}