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

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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: Angelo Dureghello <angelo@sysam.it>
Tested-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Angelo Dureghello 2018-08-19 19:27:13 +02:00 committed by Vinod Koul
parent 1297b647c5
commit 9d831528a6
4 changed files with 795 additions and 697 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/dma/Makefile
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@ -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

552
drivers/dma/fsl-edma-common.c Normal file
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@ -0,0 +1,552 @@
// 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");

241
drivers/dma/fsl-edma-common.h Normal file
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@ -0,0 +1,241 @@
/* 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_ */

697
drivers/dma/fsl-edma.c
View File

@ -13,653 +13,16 @@
* option) any later version.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/dmapool.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_dma.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 u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
{
if (edma->big_endian)
return ioread32be(addr);
else
return ioread32(addr);
}
static 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 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 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 struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
{
return container_of(chan, struct fsl_edma_chan, vchan.chan);
}
static struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
{
return container_of(vd, struct fsl_edma_desc, vdesc);
}
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);
}
static 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);
}
static 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 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);
}
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;
}
}
static 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);
}
static 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;
}
static 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;
}
static 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;
}
static 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;
}
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;
}
static 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;
}
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;
}
static 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);
}
static 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);
}
static 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;
}
#include "fsl-edma-common.h"
static irqreturn_t fsl_edma_tx_handler(int irq, void *dev_id)
{
@ -730,25 +93,6 @@ static irqreturn_t fsl_edma_irq_handler(int irq, void *dev_id)
return fsl_edma_err_handler(irq, dev_id);
}
static 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);
}
static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
struct of_dma *ofdma)
{
@ -781,34 +125,6 @@ static struct dma_chan *fsl_edma_xlate(struct of_phandle_args *dma_spec,
return NULL;
}
static 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;
}
static 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;
}
static int
fsl_edma_irq_init(struct platform_device *pdev, struct fsl_edma_engine *fsl_edma)
{
@ -995,17 +311,6 @@ static int fsl_edma_probe(struct platform_device *pdev)
return 0;
}
static 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);
}
}
static int fsl_edma_remove(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;