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Commit 9d831528 authored by Angelo Dureghello's avatar Angelo Dureghello Committed by Vinod Koul
Browse files

dmaengine: fsl-edma: extract common fsl-edma code (no changes in behavior intended) 



This patch adds a new fsl-edma-common module to allow new
mcf-edma module code to use most of the fsl-edma code.

Signed-off-by: default avatarAngelo Dureghello <angelo@sysam.it>
Tested-by: default avatarKrzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent 1297b647

drivers/dma/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -31,7 +31,7 @@ obj-$(CONFIG_DW_AXI_DMAC) += dw-axi-dmac/ 
obj-$(CONFIG_DW_DMAC_CORE) += dw/

obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o

obj-$(CONFIG_FSL_DMA) += fsldma.o

obj-$(CONFIG_FSL_EDMA) += fsl-edma.o

obj-$(CONFIG_FSL_EDMA) += fsl-edma.o fsl-edma-common.o

obj-$(CONFIG_FSL_RAID) += fsl_raid.o

obj-$(CONFIG_HSU_DMA) += hsu/

obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o

drivers/dma/fsl-edma-common.c

0 → 100644
+552 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0+

//

// Copyright (c) 2013-2014 Freescale Semiconductor, Inc

// Copyright (c) 2017 Sysam, Angelo Dureghello  <angelo@sysam.it>



#include <linux/dmapool.h>

#include <linux/module.h>

#include <linux/slab.h>



#include "fsl-edma-common.h"



#define EDMA_CR			0x00

#define EDMA_ES			0x04

#define EDMA_ERQ		0x0C

#define EDMA_EEI		0x14

#define EDMA_SERQ		0x1B

#define EDMA_CERQ		0x1A

#define EDMA_SEEI		0x19

#define EDMA_CEEI		0x18

#define EDMA_CINT		0x1F

#define EDMA_CERR		0x1E

#define EDMA_SSRT		0x1D

#define EDMA_CDNE		0x1C

#define EDMA_INTR		0x24

#define EDMA_ERR		0x2C



#define EDMA64_ERQH		0x08

#define EDMA64_EEIH		0x10

#define EDMA64_SERQ		0x18

#define EDMA64_CERQ		0x19

#define EDMA64_SEEI		0x1a

#define EDMA64_CEEI		0x1b

#define EDMA64_CINT		0x1c

#define EDMA64_CERR		0x1d

#define EDMA64_SSRT		0x1e

#define EDMA64_CDNE		0x1f

#define EDMA64_INTH		0x20

#define EDMA64_INTL		0x24

#define EDMA64_ERRH		0x28

#define EDMA64_ERRL		0x2c



#define EDMA_TCD		0x1000



static void fsl_edma_enable_request(struct fsl_edma_chan *fsl_chan)

{

	void __iomem *addr = fsl_chan->edma->membase;

	u32 ch = fsl_chan->vchan.chan.chan_id;



	edma_writeb(fsl_chan->edma, EDMA_SEEI_SEEI(ch), addr + EDMA_SEEI);

	edma_writeb(fsl_chan->edma, ch, addr + EDMA_SERQ);

}



void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan)

{

	void __iomem *addr = fsl_chan->edma->membase;

	u32 ch = fsl_chan->vchan.chan.chan_id;



	edma_writeb(fsl_chan->edma, ch, addr + EDMA_CERQ);

	edma_writeb(fsl_chan->edma, EDMA_CEEI_CEEI(ch), addr + EDMA_CEEI);

}

EXPORT_SYMBOL_GPL(fsl_edma_disable_request);



void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,

			unsigned int slot, bool enable)

{

	u32 ch = fsl_chan->vchan.chan.chan_id;

	void __iomem *muxaddr;

	unsigned int chans_per_mux, ch_off;



	chans_per_mux = fsl_chan->edma->n_chans / DMAMUX_NR;

	ch_off = fsl_chan->vchan.chan.chan_id % chans_per_mux;

	muxaddr = fsl_chan->edma->muxbase[ch / chans_per_mux];

	slot = EDMAMUX_CHCFG_SOURCE(slot);



	if (enable)

		iowrite8(EDMAMUX_CHCFG_ENBL | slot, muxaddr + ch_off);

	else

		iowrite8(EDMAMUX_CHCFG_DIS, muxaddr + ch_off);

}

EXPORT_SYMBOL_GPL(fsl_edma_chan_mux);



static unsigned int fsl_edma_get_tcd_attr(enum dma_slave_buswidth addr_width)

{

	switch (addr_width) {

	case 1:

		return EDMA_TCD_ATTR_SSIZE_8BIT | EDMA_TCD_ATTR_DSIZE_8BIT;

	case 2:

		return EDMA_TCD_ATTR_SSIZE_16BIT | EDMA_TCD_ATTR_DSIZE_16BIT;

	case 4:

		return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;

	case 8:

		return EDMA_TCD_ATTR_SSIZE_64BIT | EDMA_TCD_ATTR_DSIZE_64BIT;

	default:

		return EDMA_TCD_ATTR_SSIZE_32BIT | EDMA_TCD_ATTR_DSIZE_32BIT;

	}

}



void fsl_edma_free_desc(struct virt_dma_desc *vdesc)

{

	struct fsl_edma_desc *fsl_desc;

	int i;



	fsl_desc = to_fsl_edma_desc(vdesc);

	for (i = 0; i < fsl_desc->n_tcds; i++)

		dma_pool_free(fsl_desc->echan->tcd_pool, fsl_desc->tcd[i].vtcd,

			      fsl_desc->tcd[i].ptcd);

	kfree(fsl_desc);

}

EXPORT_SYMBOL_GPL(fsl_edma_free_desc);



int fsl_edma_terminate_all(struct dma_chan *chan)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);

	unsigned long flags;

	LIST_HEAD(head);



	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);

	fsl_edma_disable_request(fsl_chan);

	fsl_chan->edesc = NULL;

	fsl_chan->idle = true;

	vchan_get_all_descriptors(&fsl_chan->vchan, &head);

	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);

	vchan_dma_desc_free_list(&fsl_chan->vchan, &head);

	return 0;

}

EXPORT_SYMBOL_GPL(fsl_edma_terminate_all);



int fsl_edma_pause(struct dma_chan *chan)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);

	unsigned long flags;



	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);

	if (fsl_chan->edesc) {

		fsl_edma_disable_request(fsl_chan);

		fsl_chan->status = DMA_PAUSED;

		fsl_chan->idle = true;

	}

	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);

	return 0;

}

EXPORT_SYMBOL_GPL(fsl_edma_pause);



int fsl_edma_resume(struct dma_chan *chan)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);

	unsigned long flags;



	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);

	if (fsl_chan->edesc) {

		fsl_edma_enable_request(fsl_chan);

		fsl_chan->status = DMA_IN_PROGRESS;

		fsl_chan->idle = false;

	}

	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);

	return 0;

}

EXPORT_SYMBOL_GPL(fsl_edma_resume);



int fsl_edma_slave_config(struct dma_chan *chan,

				 struct dma_slave_config *cfg)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);



	fsl_chan->fsc.dir = cfg->direction;

	if (cfg->direction == DMA_DEV_TO_MEM) {

		fsl_chan->fsc.dev_addr = cfg->src_addr;

		fsl_chan->fsc.addr_width = cfg->src_addr_width;

		fsl_chan->fsc.burst = cfg->src_maxburst;

		fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->src_addr_width);

	} else if (cfg->direction == DMA_MEM_TO_DEV) {

		fsl_chan->fsc.dev_addr = cfg->dst_addr;

		fsl_chan->fsc.addr_width = cfg->dst_addr_width;

		fsl_chan->fsc.burst = cfg->dst_maxburst;

		fsl_chan->fsc.attr = fsl_edma_get_tcd_attr(cfg->dst_addr_width);

	} else

		return -EINVAL;



	return 0;

}

EXPORT_SYMBOL_GPL(fsl_edma_slave_config);



static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,

		struct virt_dma_desc *vdesc, bool in_progress)

{

	struct fsl_edma_desc *edesc = fsl_chan->edesc;

	void __iomem *addr = fsl_chan->edma->membase;

	u32 ch = fsl_chan->vchan.chan.chan_id;

	enum dma_transfer_direction dir = fsl_chan->fsc.dir;

	dma_addr_t cur_addr, dma_addr;

	size_t len, size;

	int i;



	/* calculate the total size in this desc */

	for (len = i = 0; i < fsl_chan->edesc->n_tcds; i++)

		len += le32_to_cpu(edesc->tcd[i].vtcd->nbytes)

			* le16_to_cpu(edesc->tcd[i].vtcd->biter);



	if (!in_progress)

		return len;



	if (dir == DMA_MEM_TO_DEV)

		cur_addr = edma_readl(

			fsl_chan->edma, addr + EDMA_TCD_SADDR(ch));

	else

		cur_addr = edma_readl(

			fsl_chan->edma, addr + EDMA_TCD_DADDR(ch));



	/* figure out the finished and calculate the residue */

	for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {

		size = le32_to_cpu(edesc->tcd[i].vtcd->nbytes)

			* le16_to_cpu(edesc->tcd[i].vtcd->biter);

		if (dir == DMA_MEM_TO_DEV)

			dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->saddr);

		else

			dma_addr = le32_to_cpu(edesc->tcd[i].vtcd->daddr);



		len -= size;

		if (cur_addr >= dma_addr && cur_addr < dma_addr + size) {

			len += dma_addr + size - cur_addr;

			break;

		}

	}



	return len;

}



enum dma_status fsl_edma_tx_status(struct dma_chan *chan,

		dma_cookie_t cookie, struct dma_tx_state *txstate)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);

	struct virt_dma_desc *vdesc;

	enum dma_status status;

	unsigned long flags;



	status = dma_cookie_status(chan, cookie, txstate);

	if (status == DMA_COMPLETE)

		return status;



	if (!txstate)

		return fsl_chan->status;



	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);

	vdesc = vchan_find_desc(&fsl_chan->vchan, cookie);

	if (fsl_chan->edesc && cookie == fsl_chan->edesc->vdesc.tx.cookie)

		txstate->residue =

			fsl_edma_desc_residue(fsl_chan, vdesc, true);

	else if (vdesc)

		txstate->residue =

			fsl_edma_desc_residue(fsl_chan, vdesc, false);

	else

		txstate->residue = 0;



	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);



	return fsl_chan->status;

}

EXPORT_SYMBOL_GPL(fsl_edma_tx_status);



static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,

				  struct fsl_edma_hw_tcd *tcd)

{

	struct fsl_edma_engine *edma = fsl_chan->edma;

	void __iomem *addr = fsl_chan->edma->membase;

	u32 ch = fsl_chan->vchan.chan.chan_id;



	/*

	 * TCD parameters are stored in struct fsl_edma_hw_tcd in little

	 * endian format. However, we need to load the TCD registers in

	 * big- or little-endian obeying the eDMA engine model endian.

	 */

	edma_writew(edma, 0, addr + EDMA_TCD_CSR(ch));

	edma_writel(edma, le32_to_cpu(tcd->saddr), addr + EDMA_TCD_SADDR(ch));

	edma_writel(edma, le32_to_cpu(tcd->daddr), addr + EDMA_TCD_DADDR(ch));



	edma_writew(edma, le16_to_cpu(tcd->attr), addr + EDMA_TCD_ATTR(ch));

	edma_writew(edma, le16_to_cpu(tcd->soff), addr + EDMA_TCD_SOFF(ch));



	edma_writel(edma, le32_to_cpu(tcd->nbytes), addr + EDMA_TCD_NBYTES(ch));

	edma_writel(edma, le32_to_cpu(tcd->slast), addr + EDMA_TCD_SLAST(ch));



	edma_writew(edma, le16_to_cpu(tcd->citer), addr + EDMA_TCD_CITER(ch));

	edma_writew(edma, le16_to_cpu(tcd->biter), addr + EDMA_TCD_BITER(ch));

	edma_writew(edma, le16_to_cpu(tcd->doff), addr + EDMA_TCD_DOFF(ch));



	edma_writel(edma,

		    le32_to_cpu(tcd->dlast_sga), addr + EDMA_TCD_DLAST_SGA(ch));



	edma_writew(edma, le16_to_cpu(tcd->csr), addr + EDMA_TCD_CSR(ch));

}



static inline

void fsl_edma_fill_tcd(struct fsl_edma_hw_tcd *tcd, u32 src, u32 dst,

		       u16 attr, u16 soff, u32 nbytes, u32 slast, u16 citer,

		       u16 biter, u16 doff, u32 dlast_sga, bool major_int,

		       bool disable_req, bool enable_sg)

{

	u16 csr = 0;



	/*

	 * eDMA hardware SGs require the TCDs to be stored in little

	 * endian format irrespective of the register endian model.

	 * So we put the value in little endian in memory, waiting

	 * for fsl_edma_set_tcd_regs doing the swap.

	 */

	tcd->saddr = cpu_to_le32(src);

	tcd->daddr = cpu_to_le32(dst);



	tcd->attr = cpu_to_le16(attr);



	tcd->soff = cpu_to_le16(EDMA_TCD_SOFF_SOFF(soff));



	tcd->nbytes = cpu_to_le32(EDMA_TCD_NBYTES_NBYTES(nbytes));

	tcd->slast = cpu_to_le32(EDMA_TCD_SLAST_SLAST(slast));



	tcd->citer = cpu_to_le16(EDMA_TCD_CITER_CITER(citer));

	tcd->doff = cpu_to_le16(EDMA_TCD_DOFF_DOFF(doff));



	tcd->dlast_sga = cpu_to_le32(EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga));



	tcd->biter = cpu_to_le16(EDMA_TCD_BITER_BITER(biter));

	if (major_int)

		csr |= EDMA_TCD_CSR_INT_MAJOR;



	if (disable_req)

		csr |= EDMA_TCD_CSR_D_REQ;



	if (enable_sg)

		csr |= EDMA_TCD_CSR_E_SG;



	tcd->csr = cpu_to_le16(csr);

}



static struct fsl_edma_desc *fsl_edma_alloc_desc(struct fsl_edma_chan *fsl_chan,

		int sg_len)

{

	struct fsl_edma_desc *fsl_desc;

	int i;



	fsl_desc = kzalloc(sizeof(*fsl_desc) +

			   sizeof(struct fsl_edma_sw_tcd) *

			   sg_len, GFP_NOWAIT);

	if (!fsl_desc)

		return NULL;



	fsl_desc->echan = fsl_chan;

	fsl_desc->n_tcds = sg_len;

	for (i = 0; i < sg_len; i++) {

		fsl_desc->tcd[i].vtcd = dma_pool_alloc(fsl_chan->tcd_pool,

					GFP_NOWAIT, &fsl_desc->tcd[i].ptcd);

		if (!fsl_desc->tcd[i].vtcd)

			goto err;

	}

	return fsl_desc;



err:

	while (--i >= 0)

		dma_pool_free(fsl_chan->tcd_pool, fsl_desc->tcd[i].vtcd,

				fsl_desc->tcd[i].ptcd);

	kfree(fsl_desc);

	return NULL;

}



struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(

		struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,

		size_t period_len, enum dma_transfer_direction direction,

		unsigned long flags)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);

	struct fsl_edma_desc *fsl_desc;

	dma_addr_t dma_buf_next;

	int sg_len, i;

	u32 src_addr, dst_addr, last_sg, nbytes;

	u16 soff, doff, iter;



	if (!is_slave_direction(fsl_chan->fsc.dir))

		return NULL;



	sg_len = buf_len / period_len;

	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);

	if (!fsl_desc)

		return NULL;

	fsl_desc->iscyclic = true;



	dma_buf_next = dma_addr;

	nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;

	iter = period_len / nbytes;



	for (i = 0; i < sg_len; i++) {

		if (dma_buf_next >= dma_addr + buf_len)

			dma_buf_next = dma_addr;



		/* get next sg's physical address */

		last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;



		if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {

			src_addr = dma_buf_next;

			dst_addr = fsl_chan->fsc.dev_addr;

			soff = fsl_chan->fsc.addr_width;

			doff = 0;

		} else {

			src_addr = fsl_chan->fsc.dev_addr;

			dst_addr = dma_buf_next;

			soff = 0;

			doff = fsl_chan->fsc.addr_width;

		}



		fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr, dst_addr,

				  fsl_chan->fsc.attr, soff, nbytes, 0, iter,

				  iter, doff, last_sg, true, false, true);

		dma_buf_next += period_len;

	}



	return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);

}

EXPORT_SYMBOL_GPL(fsl_edma_prep_dma_cyclic);



struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(

		struct dma_chan *chan, struct scatterlist *sgl,

		unsigned int sg_len, enum dma_transfer_direction direction,

		unsigned long flags, void *context)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);

	struct fsl_edma_desc *fsl_desc;

	struct scatterlist *sg;

	u32 src_addr, dst_addr, last_sg, nbytes;

	u16 soff, doff, iter;

	int i;



	if (!is_slave_direction(fsl_chan->fsc.dir))

		return NULL;



	fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len);

	if (!fsl_desc)

		return NULL;

	fsl_desc->iscyclic = false;



	nbytes = fsl_chan->fsc.addr_width * fsl_chan->fsc.burst;

	for_each_sg(sgl, sg, sg_len, i) {

		/* get next sg's physical address */

		last_sg = fsl_desc->tcd[(i + 1) % sg_len].ptcd;



		if (fsl_chan->fsc.dir == DMA_MEM_TO_DEV) {

			src_addr = sg_dma_address(sg);

			dst_addr = fsl_chan->fsc.dev_addr;

			soff = fsl_chan->fsc.addr_width;

			doff = 0;

		} else {

			src_addr = fsl_chan->fsc.dev_addr;

			dst_addr = sg_dma_address(sg);

			soff = 0;

			doff = fsl_chan->fsc.addr_width;

		}



		iter = sg_dma_len(sg) / nbytes;

		if (i < sg_len - 1) {

			last_sg = fsl_desc->tcd[(i + 1)].ptcd;

			fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,

					  dst_addr, fsl_chan->fsc.attr, soff,

					  nbytes, 0, iter, iter, doff, last_sg,

					  false, false, true);

		} else {

			last_sg = 0;

			fsl_edma_fill_tcd(fsl_desc->tcd[i].vtcd, src_addr,

					  dst_addr, fsl_chan->fsc.attr, soff,

					  nbytes, 0, iter, iter, doff, last_sg,

					  true, true, false);

		}

	}



	return vchan_tx_prep(&fsl_chan->vchan, &fsl_desc->vdesc, flags);

}

EXPORT_SYMBOL_GPL(fsl_edma_prep_slave_sg);



void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan)

{

	struct virt_dma_desc *vdesc;



	vdesc = vchan_next_desc(&fsl_chan->vchan);

	if (!vdesc)

		return;

	fsl_chan->edesc = to_fsl_edma_desc(vdesc);

	fsl_edma_set_tcd_regs(fsl_chan, fsl_chan->edesc->tcd[0].vtcd);

	fsl_edma_enable_request(fsl_chan);

	fsl_chan->status = DMA_IN_PROGRESS;

	fsl_chan->idle = false;

}

EXPORT_SYMBOL_GPL(fsl_edma_xfer_desc);



void fsl_edma_issue_pending(struct dma_chan *chan)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);

	unsigned long flags;



	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);



	if (unlikely(fsl_chan->pm_state != RUNNING)) {

		spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);

		/* cannot submit due to suspend */

		return;

	}



	if (vchan_issue_pending(&fsl_chan->vchan) && !fsl_chan->edesc)

		fsl_edma_xfer_desc(fsl_chan);



	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);

}

EXPORT_SYMBOL_GPL(fsl_edma_issue_pending);



int fsl_edma_alloc_chan_resources(struct dma_chan *chan)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);



	fsl_chan->tcd_pool = dma_pool_create("tcd_pool", chan->device->dev,

				sizeof(struct fsl_edma_hw_tcd),

				32, 0);

	return 0;

}

EXPORT_SYMBOL_GPL(fsl_edma_alloc_chan_resources);



void fsl_edma_free_chan_resources(struct dma_chan *chan)

{

	struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan);

	unsigned long flags;

	LIST_HEAD(head);



	spin_lock_irqsave(&fsl_chan->vchan.lock, flags);

	fsl_edma_disable_request(fsl_chan);

	fsl_edma_chan_mux(fsl_chan, 0, false);

	fsl_chan->edesc = NULL;

	vchan_get_all_descriptors(&fsl_chan->vchan, &head);

	spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags);



	vchan_dma_desc_free_list(&fsl_chan->vchan, &head);

	dma_pool_destroy(fsl_chan->tcd_pool);

	fsl_chan->tcd_pool = NULL;

}

EXPORT_SYMBOL_GPL(fsl_edma_free_chan_resources);



void fsl_edma_cleanup_vchan(struct dma_device *dmadev)

{

	struct fsl_edma_chan *chan, *_chan;



	list_for_each_entry_safe(chan, _chan,

				&dmadev->channels, vchan.chan.device_node) {

		list_del(&chan->vchan.chan.device_node);

		tasklet_kill(&chan->vchan.task);

	}

}

EXPORT_SYMBOL_GPL(fsl_edma_cleanup_vchan);



MODULE_LICENSE("GPL v2");

drivers/dma/fsl-edma-common.h

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Original line number Diff line number Diff line 
/* SPDX-License-Identifier: GPL-2.0+ */

/*

 * Copyright 2013-2014 Freescale Semiconductor, Inc.

 * Copyright 2018 Angelo Dureghello <angelo@sysam.it>

 */

#ifndef _FSL_EDMA_COMMON_H_

#define _FSL_EDMA_COMMON_H_



#include "virt-dma.h"



#define EDMA_CR			0x00

#define EDMA_ES			0x04

#define EDMA_ERQ		0x0C

#define EDMA_EEI		0x14

#define EDMA_SERQ		0x1B

#define EDMA_CERQ		0x1A

#define EDMA_SEEI		0x19

#define EDMA_CEEI		0x18

#define EDMA_CINT		0x1F

#define EDMA_CERR		0x1E

#define EDMA_SSRT		0x1D

#define EDMA_CDNE		0x1C

#define EDMA_INTR		0x24

#define EDMA_ERR		0x2C



#define EDMA_TCD_SADDR(x)	(0x1000 + 32 * (x))

#define EDMA_TCD_SOFF(x)	(0x1004 + 32 * (x))

#define EDMA_TCD_ATTR(x)	(0x1006 + 32 * (x))

#define EDMA_TCD_NBYTES(x)	(0x1008 + 32 * (x))

#define EDMA_TCD_SLAST(x)	(0x100C + 32 * (x))

#define EDMA_TCD_DADDR(x)	(0x1010 + 32 * (x))

#define EDMA_TCD_DOFF(x)	(0x1014 + 32 * (x))

#define EDMA_TCD_CITER_ELINK(x)	(0x1016 + 32 * (x))

#define EDMA_TCD_CITER(x)	(0x1016 + 32 * (x))

#define EDMA_TCD_DLAST_SGA(x)	(0x1018 + 32 * (x))

#define EDMA_TCD_CSR(x)		(0x101C + 32 * (x))

#define EDMA_TCD_BITER_ELINK(x)	(0x101E + 32 * (x))

#define EDMA_TCD_BITER(x)	(0x101E + 32 * (x))



#define EDMA_CR_EDBG		BIT(1)

#define EDMA_CR_ERCA		BIT(2)

#define EDMA_CR_ERGA		BIT(3)

#define EDMA_CR_HOE		BIT(4)

#define EDMA_CR_HALT		BIT(5)

#define EDMA_CR_CLM		BIT(6)

#define EDMA_CR_EMLM		BIT(7)

#define EDMA_CR_ECX		BIT(16)

#define EDMA_CR_CX		BIT(17)



#define EDMA_SEEI_SEEI(x)	((x) & 0x1F)

#define EDMA_CEEI_CEEI(x)	((x) & 0x1F)

#define EDMA_CINT_CINT(x)	((x) & 0x1F)

#define EDMA_CERR_CERR(x)	((x) & 0x1F)



#define EDMA_TCD_ATTR_DSIZE(x)		(((x) & 0x0007))

#define EDMA_TCD_ATTR_DMOD(x)		(((x) & 0x001F) << 3)

#define EDMA_TCD_ATTR_SSIZE(x)		(((x) & 0x0007) << 8)

#define EDMA_TCD_ATTR_SMOD(x)		(((x) & 0x001F) << 11)

#define EDMA_TCD_ATTR_SSIZE_8BIT	(0x0000)

#define EDMA_TCD_ATTR_SSIZE_16BIT	(0x0100)

#define EDMA_TCD_ATTR_SSIZE_32BIT	(0x0200)

#define EDMA_TCD_ATTR_SSIZE_64BIT	(0x0300)

#define EDMA_TCD_ATTR_SSIZE_32BYTE	(0x0500)

#define EDMA_TCD_ATTR_DSIZE_8BIT	(0x0000)

#define EDMA_TCD_ATTR_DSIZE_16BIT	(0x0001)

#define EDMA_TCD_ATTR_DSIZE_32BIT	(0x0002)

#define EDMA_TCD_ATTR_DSIZE_64BIT	(0x0003)

#define EDMA_TCD_ATTR_DSIZE_32BYTE	(0x0005)



#define EDMA_TCD_SOFF_SOFF(x)		(x)

#define EDMA_TCD_NBYTES_NBYTES(x)	(x)

#define EDMA_TCD_SLAST_SLAST(x)		(x)

#define EDMA_TCD_DADDR_DADDR(x)		(x)

#define EDMA_TCD_CITER_CITER(x)		((x) & 0x7FFF)

#define EDMA_TCD_DOFF_DOFF(x)		(x)

#define EDMA_TCD_DLAST_SGA_DLAST_SGA(x)	(x)

#define EDMA_TCD_BITER_BITER(x)		((x) & 0x7FFF)



#define EDMA_TCD_CSR_START		BIT(0)

#define EDMA_TCD_CSR_INT_MAJOR		BIT(1)

#define EDMA_TCD_CSR_INT_HALF		BIT(2)

#define EDMA_TCD_CSR_D_REQ		BIT(3)

#define EDMA_TCD_CSR_E_SG		BIT(4)

#define EDMA_TCD_CSR_E_LINK		BIT(5)

#define EDMA_TCD_CSR_ACTIVE		BIT(6)

#define EDMA_TCD_CSR_DONE		BIT(7)



#define EDMAMUX_CHCFG_DIS		0x0

#define EDMAMUX_CHCFG_ENBL		0x80

#define EDMAMUX_CHCFG_SOURCE(n)		((n) & 0x3F)



#define DMAMUX_NR	2



#define FSL_EDMA_BUSWIDTHS	(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \

				 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \

				 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \

				 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))

enum fsl_edma_pm_state {

	RUNNING = 0,

	SUSPENDED,

};



struct fsl_edma_hw_tcd {

	__le32	saddr;

	__le16	soff;

	__le16	attr;

	__le32	nbytes;

	__le32	slast;

	__le32	daddr;

	__le16	doff;

	__le16	citer;

	__le32	dlast_sga;

	__le16	csr;

	__le16	biter;

};



struct fsl_edma_sw_tcd {

	dma_addr_t			ptcd;

	struct fsl_edma_hw_tcd		*vtcd;

};



struct fsl_edma_slave_config {

	enum dma_transfer_direction	dir;

	enum dma_slave_buswidth		addr_width;

	u32				dev_addr;

	u32				burst;

	u32				attr;

};



struct fsl_edma_chan {

	struct virt_dma_chan		vchan;

	enum dma_status			status;

	enum fsl_edma_pm_state		pm_state;

	bool				idle;

	u32				slave_id;

	struct fsl_edma_engine		*edma;

	struct fsl_edma_desc		*edesc;

	struct fsl_edma_slave_config	fsc;

	struct dma_pool			*tcd_pool;

};



struct fsl_edma_desc {

	struct virt_dma_desc		vdesc;

	struct fsl_edma_chan		*echan;

	bool				iscyclic;

	unsigned int			n_tcds;

	struct fsl_edma_sw_tcd		tcd[];

};



struct fsl_edma_engine {

	struct dma_device	dma_dev;

	void __iomem		*membase;

	void __iomem		*muxbase[DMAMUX_NR];

	struct clk		*muxclk[DMAMUX_NR];

	struct mutex		fsl_edma_mutex;

	u32			n_chans;

	int			txirq;

	int			errirq;

	bool			big_endian;

	struct fsl_edma_chan	chans[];

};



/*

 * R/W functions for big- or little-endian registers:

 * The eDMA controller's endian is independent of the CPU core's endian.

 * For the big-endian IP module, the offset for 8-bit or 16-bit registers

 * should also be swapped opposite to that in little-endian IP.

 */

static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)

{

	if (edma->big_endian)

		return ioread32be(addr);

	else

		return ioread32(addr);

}



static inline void edma_writeb(struct fsl_edma_engine *edma,

			       u8 val, void __iomem *addr)

{

	/* swap the reg offset for these in big-endian mode */

	if (edma->big_endian)

		iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));

	else

		iowrite8(val, addr);

}



static inline void edma_writew(struct fsl_edma_engine *edma,

			       u16 val, void __iomem *addr)

{

	/* swap the reg offset for these in big-endian mode */

	if (edma->big_endian)

		iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));

	else

		iowrite16(val, addr);

}



static inline void edma_writel(struct fsl_edma_engine *edma,

			       u32 val, void __iomem *addr)

{

	if (edma->big_endian)

		iowrite32be(val, addr);

	else

		iowrite32(val, addr);

}



static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)

{

	return container_of(chan, struct fsl_edma_chan, vchan.chan);

}



static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)

{

	return container_of(vd, struct fsl_edma_desc, vdesc);

}



void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan);

void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,

			unsigned int slot, bool enable);

void fsl_edma_free_desc(struct virt_dma_desc *vdesc);

int fsl_edma_terminate_all(struct dma_chan *chan);

int fsl_edma_pause(struct dma_chan *chan);

int fsl_edma_resume(struct dma_chan *chan);

int fsl_edma_slave_config(struct dma_chan *chan,

				 struct dma_slave_config *cfg);

enum dma_status fsl_edma_tx_status(struct dma_chan *chan,

		dma_cookie_t cookie, struct dma_tx_state *txstate);

struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(

		struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,

		size_t period_len, enum dma_transfer_direction direction,

		unsigned long flags);

struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(

		struct dma_chan *chan, struct scatterlist *sgl,

		unsigned int sg_len, enum dma_transfer_direction direction,

		unsigned long flags, void *context);

void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);

void fsl_edma_issue_pending(struct dma_chan *chan);

int fsl_edma_alloc_chan_resources(struct dma_chan *chan);

void fsl_edma_free_chan_resources(struct dma_chan *chan);

void fsl_edma_cleanup_vchan(struct dma_device *dmadev);



#endif /* _FSL_EDMA_COMMON_H_ */

drivers/dma/fsl-edma.c

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