Re: [PATCH] dmaengine: dw-edma: Add support for native HDMA

Serge Semin
2022-09-02T23:02:18Z

Hello Cai

On Tue, Aug 30, 2022 at 12:24:22PM +0800, Cai Huoqing wrote:
> On 24 8月 22 22:01:44, Cai Huoqing wrote:
> > Add support for HDMA NATIVE, as long the IP design has set
> > the compatible register map parameter-HDMA_NATIVE,
> > which allows compatibility for native HDMA register configuration.
> >
> > The HDMA Hyper-DMA IP is an enhancement of the eDMA embedded-DMA IP.
> > And the native HDMA registers are different from eDMA,
> > so this patch add support for HDMA NATIVE mode
> Just ping this patch

Thanks for the patchset. I have much doubts the driver maintainer
will pop up any time soon. My series has been on review for over
six months now. No messages from Gustavo have been received. I'll have
a look at your patch on the next week (or after it). Meanwhile could
you please rebase it on top of another DW eDMA-related series:
Link: https://lore.kernel.org/linux-pci/20220822184701.25246-1-Sergey.Semin@baikalelectronics.ru/
and
Link: https://lore.kernel.org/dmaengine/20220822185332.26149-1-Sergey.Semin@baikalelectronics.ru/
?
The later patchset is at the final stage of review process. So you'll
need to have your work based on it anyway. After it's done just make
sure the driver still work and add a note to the patch log that your
patch is based on that patchset. Don't forget to add me to the Cc list
of next revision of your patch so I would be notified when you
resubmit it.

-Sergey

> >
> > Signed-off-by: Cai Huoqing <cai.huoqing@linux.dev>
> > ---
> > drivers/dma/dw-edma/Makefile | 4 +-
> > drivers/dma/dw-edma/dw-edma-core.c | 116 ++++++++---
> > drivers/dma/dw-edma/dw-edma-pcie.c | 5 +-
> > drivers/dma/dw-edma/dw-edma-v0-core.c | 3 +
> > drivers/dma/dw-edma/dw-hdma-v0-core.c | 236 +++++++++++++++++++++++
> > drivers/dma/dw-edma/dw-hdma-v0-core.h | 27 +++
> > drivers/dma/dw-edma/dw-hdma-v0-debugfs.c | 167 ++++++++++++++++
> > drivers/dma/dw-edma/dw-hdma-v0-debugfs.h | 25 +++
> > drivers/dma/dw-edma/dw-hdma-v0-regs.h | 94 +++++++++
> > include/linux/dma/edma.h | 3 +-
> > 10 files changed, 646 insertions(+), 34 deletions(-)
> > create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-core.c
> > create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-core.h
> > create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-debugfs.c
> > create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-debugfs.h
> > create mode 100644 drivers/dma/dw-edma/dw-hdma-v0-regs.h
> >
> > diff --git a/drivers/dma/dw-edma/Makefile b/drivers/dma/dw-edma/Makefile
> > index 8d45c0d5689d..95c5ae760a64 100644
> > --- a/drivers/dma/dw-edma/Makefile
> > +++ b/drivers/dma/dw-edma/Makefile
> > @@ -1,7 +1,9 @@
> > # SPDX-License-Identifier: GPL-2.0
> >
> > obj-$(CONFIG_DW_EDMA) += dw-edma.o
> > -dw-edma-$(CONFIG_DEBUG_FS) := dw-edma-v0-debugfs.o
> > +dw-edma-$(CONFIG_DEBUG_FS) := dw-edma-v0-debugfs.o \
> > + dw-hdma-v0-debugfs.o
> > dw-edma-objs := dw-edma-core.o \
> > + dw-hdma-v0-core.o \
> > dw-edma-v0-core.o $(dw-edma-y)
> > obj-$(CONFIG_DW_EDMA_PCIE) += dw-edma-pcie.o
> > diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
> > index 07f756479663..f0e44cb810d0 100644
> > --- a/drivers/dma/dw-edma/dw-edma-core.c
> > +++ b/drivers/dma/dw-edma/dw-edma-core.c
> > @@ -19,6 +19,7 @@
> >
> > #include "dw-edma-core.h"
> > #include "dw-edma-v0-core.h"
> > +#include "dw-hdma-v0-core.h"
> > #include "../dmaengine.h"
> > #include "../virt-dma.h"
> >
> > @@ -176,6 +177,7 @@ static void dw_edma_start_transfer(struct dw_edma_chan *chan)
> > struct dw_edma_chunk *child;
> > struct dw_edma_desc *desc;
> > struct virt_dma_desc *vd;
> > + struct dw_edma *dw = chan->dw;
> >
> > vd = vchan_next_desc(&chan->vc);
> > if (!vd)
> > @@ -190,7 +192,11 @@ static void dw_edma_start_transfer(struct dw_edma_chan *chan)
> > if (!child)
> > return;
> >
> > - dw_edma_v0_core_start(child, !desc->xfer_sz);
> > + if (dw->chip->mf == EDMA_MF_HDMA_NATIVE)
> > + dw_hdma_v0_core_start(child, !desc->xfer_sz);
> > + else
> > + dw_edma_v0_core_start(child, !desc->xfer_sz);
> > +
> > desc->xfer_sz += child->ll_region.sz;
> > dw_edma_free_burst(child);
> > list_del(&child->list);
> > @@ -248,8 +254,15 @@ static int dw_edma_device_resume(struct dma_chan *dchan)
> > static int dw_edma_device_terminate_all(struct dma_chan *dchan)
> > {
> > struct dw_edma_chan *chan = dchan2dw_edma_chan(dchan);
> > + struct dw_edma *dw = chan->dw;
> > + enum dma_status status;
> > int err = 0;
> >
> > + if (dw->chip->mf == EDMA_MF_HDMA_NATIVE)
> > + status = dw_hdma_v0_core_ch_status(chan);
> > + else
> > + status = dw_edma_v0_core_ch_status(chan);
> > +
> > if (!chan->configured) {
> > /* Do nothing */
> > } else if (chan->status == EDMA_ST_PAUSE) {
> > @@ -257,7 +270,7 @@ static int dw_edma_device_terminate_all(struct dma_chan *dchan)
> > chan->configured = false;
> > } else if (chan->status == EDMA_ST_IDLE) {
> > chan->configured = false;
> > - } else if (dw_edma_v0_core_ch_status(chan) == DMA_COMPLETE) {
> > + } else if (status == DMA_COMPLETE) {
> > /*
> > * The channel is in a false BUSY state, probably didn't
> > * receive or lost an interrupt
> > @@ -557,11 +570,15 @@ dw_edma_device_prep_interleaved_dma(struct dma_chan *dchan,
> >
> > static void dw_edma_done_interrupt(struct dw_edma_chan *chan)
> > {
> > + struct dw_edma *dw = chan->dw;
> > struct dw_edma_desc *desc;
> > struct virt_dma_desc *vd;
> > unsigned long flags;
> >
> > - dw_edma_v0_core_clear_done_int(chan);
> > + if (dw->chip->mf == EDMA_MF_HDMA_NATIVE)
> > + dw_hdma_v0_core_clear_done_int(chan);
> > + else
> > + dw_edma_v0_core_clear_done_int(chan);
> >
> > spin_lock_irqsave(&chan->vc.lock, flags);
> > vd = vchan_next_desc(&chan->vc);
> > @@ -601,9 +618,13 @@ static void dw_edma_done_interrupt(struct dw_edma_chan *chan)
> > static void dw_edma_abort_interrupt(struct dw_edma_chan *chan)
> > {
> > struct virt_dma_desc *vd;
> > + struct dw_edma *dw = chan->dw;
> > unsigned long flags;
> >
> > - dw_edma_v0_core_clear_abort_int(chan);
> > + if (dw->chip->mf == EDMA_MF_HDMA_NATIVE)
> > + dw_hdma_v0_core_clear_abort_int(chan);
> > + else
> > + dw_edma_v0_core_clear_abort_int(chan);
> >
> > spin_lock_irqsave(&chan->vc.lock, flags);
> > vd = vchan_next_desc(&chan->vc);
> > @@ -620,9 +641,8 @@ static irqreturn_t dw_edma_interrupt(int irq, void *data, bool write)
> > {
> > struct dw_edma_irq *dw_irq = data;
> > struct dw_edma *dw = dw_irq->dw;
> > - unsigned long total, pos, val;
> > + unsigned long total, pos, val, mask;
> > unsigned long off;
> > - u32 mask;
> >
> > if (write) {
> > total = dw->wr_ch_cnt;
> > @@ -634,24 +654,36 @@ static irqreturn_t dw_edma_interrupt(int irq, void *data, bool write)
> > mask = dw_irq->rd_mask;
> > }
> >
> > - val = dw_edma_v0_core_status_done_int(dw, write ?
> > - EDMA_DIR_WRITE :
> > - EDMA_DIR_READ);
> > - val &= mask;
> > - for_each_set_bit(pos, &val, total) {
> > - struct dw_edma_chan *chan = &dw->chan[pos + off];
> > + if (dw->chip->mf == EDMA_MF_HDMA_NATIVE) {
> > + for_each_set_bit(pos, &mask, total) {
> > + struct dw_edma_chan *chan = &dw->chan[pos + off];
> >
> > - dw_edma_done_interrupt(chan);
> > - }
> > + val = dw_hdma_v0_core_status_int(chan);
> > + if (dw_hdma_v0_core_check_done_int(val))
> > + dw_edma_done_interrupt(chan);
> > + if (dw_hdma_v0_core_check_abort_int(val))
> > + dw_edma_abort_interrupt(chan);
> > + }
> > + } else {
> > + val = dw_edma_v0_core_status_done_int(dw, write ?
> > + EDMA_DIR_WRITE :
> > + EDMA_DIR_READ);
> > + val &= mask;
> > + for_each_set_bit(pos, &val, total) {
> > + struct dw_edma_chan *chan = &dw->chan[pos + off];
> > +
> > + dw_edma_done_interrupt(chan);
> > + }
> >
> > - val = dw_edma_v0_core_status_abort_int(dw, write ?
> > - EDMA_DIR_WRITE :
> > - EDMA_DIR_READ);
> > - val &= mask;
> > - for_each_set_bit(pos, &val, total) {
> > - struct dw_edma_chan *chan = &dw->chan[pos + off];
> > + val = dw_edma_v0_core_status_abort_int(dw, write ?
> > + EDMA_DIR_WRITE :
> > + EDMA_DIR_READ);
> > + val &= mask;
> > + for_each_set_bit(pos, &val, total) {
> > + struct dw_edma_chan *chan = &dw->chan[pos + off];
> >
> > - dw_edma_abort_interrupt(chan);
> > + dw_edma_abort_interrupt(chan);
> > + }
> > }
> >
> > return IRQ_HANDLED;
> > @@ -794,7 +826,10 @@ static int dw_edma_channel_setup(struct dw_edma *dw, bool write,
> > dt_region->sz = chip->dt_region_rd[j].sz;
> > }
> >
> > - dw_edma_v0_core_device_config(chan);
> > + if (dw->chip->mf == EDMA_MF_HDMA_NATIVE)
> > + dw_hdma_v0_core_device_config(chan);
> > + else
> > + dw_edma_v0_core_device_config(chan);
> > }
> >
> > /* Set DMA channel capabilities */
> > @@ -937,13 +972,23 @@ int dw_edma_probe(struct dw_edma_chip *chip)
> >
> > raw_spin_lock_init(&dw->lock);
> >
> > - dw->wr_ch_cnt = min_t(u16, chip->ll_wr_cnt,
> > - dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE));
> > - dw->wr_ch_cnt = min_t(u16, dw->wr_ch_cnt, EDMA_MAX_WR_CH);
> > + if (chip->mf == EDMA_MF_HDMA_NATIVE) {
> > + dw->wr_ch_cnt = min_t(u16, chip->ll_wr_cnt,
> > + dw_hdma_v0_core_ch_count(dw, EDMA_DIR_WRITE));
> > + dw->wr_ch_cnt = min_t(u16, dw->wr_ch_cnt, EDMA_MAX_WR_CH);
> >
> > - dw->rd_ch_cnt = min_t(u16, chip->ll_rd_cnt,
> > - dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ));
> > - dw->rd_ch_cnt = min_t(u16, dw->rd_ch_cnt, EDMA_MAX_RD_CH);
> > + dw->rd_ch_cnt = min_t(u16, chip->ll_rd_cnt,
> > + dw_hdma_v0_core_ch_count(dw, EDMA_DIR_READ));
> > + dw->rd_ch_cnt = min_t(u16, dw->rd_ch_cnt, EDMA_MAX_RD_CH);
> > + } else {
> > + dw->wr_ch_cnt = min_t(u16, chip->ll_wr_cnt,
> > + dw_edma_v0_core_ch_count(dw, EDMA_DIR_WRITE));
> > + dw->wr_ch_cnt = min_t(u16, dw->wr_ch_cnt, EDMA_MAX_WR_CH);
> > +
> > + dw->rd_ch_cnt = min_t(u16, chip->ll_rd_cnt,
> > + dw_edma_v0_core_ch_count(dw, EDMA_DIR_READ));
> > + dw->rd_ch_cnt = min_t(u16, dw->rd_ch_cnt, EDMA_MAX_RD_CH);
> > + }
> >
> > if (!dw->wr_ch_cnt && !dw->rd_ch_cnt)
> > return -EINVAL;
> > @@ -960,7 +1005,10 @@ int dw_edma_probe(struct dw_edma_chip *chip)
> > snprintf(dw->name, sizeof(dw->name), "dw-edma-core:%d", chip->id);
> >
> > /* Disable eDMA, only to establish the ideal initial conditions */
> > - dw_edma_v0_core_off(dw);
> > + if (chip->mf == EDMA_MF_HDMA_NATIVE)
> > + dw_hdma_v0_core_off(dw);
> > + else
> > + dw_edma_v0_core_off(dw);
> >
> > /* Request IRQs */
> > err = dw_edma_irq_request(dw, &wr_alloc, &rd_alloc);
> > @@ -981,7 +1029,10 @@ int dw_edma_probe(struct dw_edma_chip *chip)
> > pm_runtime_enable(dev);
> >
> > /* Turn debugfs on */
> > - dw_edma_v0_core_debugfs_on(dw);
> > + if (chip->mf == EDMA_MF_HDMA_NATIVE)
> > + dw_hdma_v0_core_debugfs_on(dw);
> > + else
> > + dw_edma_v0_core_debugfs_on(dw);
> >
> > chip->dw = dw;
> >
> > @@ -1028,7 +1079,10 @@ int dw_edma_remove(struct dw_edma_chip *chip)
> > }
> >
> > /* Turn debugfs off */
> > - dw_edma_v0_core_debugfs_off(dw);
> > + if (chip->mf == EDMA_MF_HDMA_NATIVE)
> > + dw_hdma_v0_core_debugfs_off(dw);
> > + else
> > + dw_edma_v0_core_debugfs_off(dw);
> >
> > return 0;
> > }
> > diff --git a/drivers/dma/dw-edma/dw-edma-pcie.c b/drivers/dma/dw-edma/dw-edma-pcie.c
> > index d6b5e2463884..7cd2e045325d 100644
> > --- a/drivers/dma/dw-edma/dw-edma-pcie.c
> > +++ b/drivers/dma/dw-edma/dw-edma-pcie.c
> > @@ -121,7 +121,8 @@ static void dw_edma_pcie_get_vsec_dma_data(struct pci_dev *pdev,
> > map = FIELD_GET(DW_PCIE_VSEC_DMA_MAP, val);
> > if (map != EDMA_MF_EDMA_LEGACY &&
> > map != EDMA_MF_EDMA_UNROLL &&
> > - map != EDMA_MF_HDMA_COMPAT)
> > + map != EDMA_MF_HDMA_COMPAT &&
> > + map != EDMA_MF_HDMA_NATIVE)
> > return;
> >
> > pdata->mf = map;
> > @@ -277,6 +278,8 @@ static int dw_edma_pcie_probe(struct pci_dev *pdev,
> > pci_dbg(pdev, "Version:\teDMA Unroll (0x%x)\n", chip->mf);
> > else if (chip->mf == EDMA_MF_HDMA_COMPAT)
> > pci_dbg(pdev, "Version:\tHDMA Compatible (0x%x)\n", chip->mf);
> > + else if (chip->mf == EDMA_MF_HDMA_NATIVE)
> > + pci_dbg(pdev, "Version:\tHDMA Native (0x%x)\n", chip->mf);
> > else
> > pci_dbg(pdev, "Version:\tUnknown (0x%x)\n", chip->mf);
> >
> > diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c
> > index 77e6cfe52e0a..167a2c4144dd 100644
> > --- a/drivers/dma/dw-edma/dw-edma-v0-core.c
> > +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c
> > @@ -12,6 +12,9 @@
> > #include "dw-edma-v0-core.h"
> > #include "dw-edma-v0-regs.h"
> > #include "dw-edma-v0-debugfs.h"
> > +#include "dw-hdma-v0-core.h"
> > +#include "dw-hdma-v0-regs.h"
> > +#include "dw-hdma-v0-debugfs.h"
> >
> > enum dw_edma_control {
> > DW_EDMA_V0_CB = BIT(0),
> > diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.c b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> > new file mode 100644
> > index 000000000000..cd4746d98839
> > --- /dev/null
> > +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
> > @@ -0,0 +1,236 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2022 Cai Huoqing
> > + * Synopsys DesignWare HDMA v0 core
> > + */
> > +
> > +#include <linux/bitfield.h>
> > +
> > +#include "dw-edma-core.h"
> > +#include "dw-edma-v0-core.h"
> > +#include "dw-edma-v0-regs.h"
> > +#include "dw-hdma-v0-core.h"
> > +#include "dw-hdma-v0-regs.h"
> > +#include "dw-hdma-v0-debugfs.h"
> > +
> > +enum dw_hdma_control {
> > + DW_HDMA_V0_CB = BIT(0),
> > + DW_HDMA_V0_TCB = BIT(1),
> > + DW_HDMA_V0_LLP = BIT(2),
> > + DW_HDMA_V0_LIE = BIT(3),
> > + DW_HDMA_V0_RIE = BIT(4),
> > + DW_HDMA_V0_CCS = BIT(8),
> > + DW_HDMA_V0_LLE = BIT(9),
> > +};
> > +static inline struct dw_hdma_v0_regs __iomem *__dw_regs(struct dw_edma *dw)
> > +{
> > + return dw->chip->reg_base;
> > +}
> > +
> > +static inline struct dw_hdma_v0_ch_regs __iomem *
> > +__dw_ch_regs(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch)
> > +{
> > +
> > + if (dir == EDMA_DIR_WRITE)
> > + return &(__dw_regs(dw)->ch[ch].wr);
> > + else
> > + return &(__dw_regs(dw)->ch[ch].rd);
> > +}
> > +
> > +#define SET_CH_32(dw, dir, ch, name, value) \
> > + writel(value, &(__dw_ch_regs(dw, dir, ch)->name))
> > +
> > +#define GET_CH_32(dw, dir, ch, name) \
> > + readl(&(__dw_ch_regs(dw, dir, ch)->name))
> > +
> > +#define SET_BOTH_CH_32(dw, ch, name, value) \
> > + do { \
> > + writel(value, &(__dw_ch_regs(dw, EDMA_DIR_WRITE, ch)->name)); \
> > + writel(value, &(__dw_ch_regs(dw, EDMA_DIR_READ, ch)->name)); \
> > + } while (0)
> > +
> > +#define SET_LL_32(ll, value) \
> > + writel(value, ll)
> > +
> > +/* HDMA management callbacks */
> > +void dw_hdma_v0_core_off(struct dw_edma *dw)
> > +{
> > + int id;
> > +
> > + for (id = 0; id < HDMA_V0_MAX_NR_CH; id++) {
> > + SET_BOTH_CH_32(dw, id, int_setup,
> > + HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK);
> > + SET_BOTH_CH_32(dw, id, int_clear,
> > + HDMA_V0_STOP_INT_MASK & HDMA_V0_ABORT_INT_MASK);
> > + SET_BOTH_CH_32(dw, id, ch_en, 0);
> > + }
> > +}
> > +
> > +u16 dw_hdma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir)
> > +{
> > + u32 num_ch = 0;
> > + int id;
> > +
> > + for (id = 0; id < HDMA_V0_MAX_NR_CH; id++) {
> > + if (GET_CH_32(dw, id, dir, ch_en) & BIT(0))
> > + num_ch++;
> > + }
> > +
> > + if (num_ch > HDMA_V0_MAX_NR_CH)
> > + num_ch = HDMA_V0_MAX_NR_CH;
> > +
> > + return (u16)num_ch;
> > +}
> > +
> > +enum dma_status dw_hdma_v0_core_ch_status(struct dw_edma_chan *chan)
> > +{
> > + struct dw_edma *dw = chan->dw;
> > + u32 tmp;
> > +
> > + tmp = FIELD_GET(HDMA_V0_CH_STATUS_MASK,
> > + GET_CH_32(dw, chan->id, chan->dir, ch_stat));
> > +
> > + if (tmp == 1)
> > + return DMA_IN_PROGRESS;
> > + else if (tmp == 3)
> > + return DMA_COMPLETE;
> > + else
> > + return DMA_ERROR;
> > +}
> > +
> > +void dw_hdma_v0_core_clear_done_int(struct dw_edma_chan *chan)
> > +{
> > + struct dw_edma *dw = chan->dw;
> > +
> > + SET_CH_32(dw, chan->dir, chan->id, int_clear, HDMA_V0_STOP_INT_MASK);
> > +}
> > +
> > +void dw_hdma_v0_core_clear_abort_int(struct dw_edma_chan *chan)
> > +{
> > + struct dw_edma *dw = chan->dw;
> > +
> > + SET_CH_32(dw, chan->dir, chan->id, int_clear, HDMA_V0_ABORT_INT_MASK);
> > +}
> > +
> > +u32 dw_hdma_v0_core_status_int(struct dw_edma_chan *chan)
> > +{
> > + struct dw_edma *dw = chan->dw;
> > +
> > + return GET_CH_32(dw, chan->dir, chan->id, int_stat);
> > +}
> > +
> > +u32 dw_hdma_v0_core_check_done_int(u32 val)
> > +{
> > + return (FIELD_GET(HDMA_V0_STOP_INT_MASK, val) == BIT(0));
> > +}
> > +
> > +u32 dw_hdma_v0_core_check_abort_int(u32 val)
> > +{
> > + return (FIELD_GET(HDMA_V0_ABORT_INT_MASK, val) == BIT(0));
> > +}
> > +
> > +static void dw_hdma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
> > +{
> > + struct dw_edma_burst *child;
> > + struct dw_edma_chan *chan = chunk->chan;
> > + struct dw_edma_v0_lli __iomem *lli;
> > + struct dw_edma_v0_llp __iomem *llp;
> > + u32 control = 0, i = 0;
> > + int j;
> > +
> > + lli = chunk->ll_region.vaddr;
> > +
> > + if (chunk->cb)
> > + control = DW_HDMA_V0_CB;
> > +
> > + j = chunk->bursts_alloc;
> > + list_for_each_entry(child, &chunk->burst->list, list) {
> > + j--;
> > + if (!j) {
> > + control |= DW_HDMA_V0_LIE;
> > + if (!(chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL))
> > + control |= DW_HDMA_V0_RIE;
> > + }
> > + /* Channel control */
> > + SET_LL_32(&lli[i].control, control);
> > + /* Transfer size */
> > + SET_LL_32(&lli[i].transfer_size, child->sz);
> > + /* SAR */
> > + SET_LL_32(&lli[i].sar.lsb, lower_32_bits(child->sar));
> > + SET_LL_32(&lli[i].sar.msb, upper_32_bits(child->sar));
> > + /* DAR */
> > + SET_LL_32(&lli[i].dar.lsb, lower_32_bits(child->dar));
> > + SET_LL_32(&lli[i].dar.msb, upper_32_bits(child->dar));
> > + i++;
> > + }
> > +
> > + llp = (void __iomem *)&lli[i];
> > + control = DW_HDMA_V0_LLP | DW_HDMA_V0_TCB;
> > + if (!chunk->cb)
> > + control |= DW_HDMA_V0_CB;
> > +
> > + /* Channel control */
> > + SET_LL_32(&llp->control, control);
> > + /* Linked list */
> > + SET_LL_32(&llp->llp.lsb, lower_32_bits(chunk->ll_region.paddr));
> > + SET_LL_32(&llp->llp.msb, upper_32_bits(chunk->ll_region.paddr));
> > +}
> > +
> > +void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
> > +{
> > + struct dw_edma_chan *chan = chunk->chan;
> > + struct dw_edma *dw = chan->dw;
> > + u32 tmp;
> > +
> > + dw_hdma_v0_core_write_chunk(chunk);
> > +
> > + if (first) {
> > + /* Enable engine */
> > + SET_CH_32(dw, chan->dir, chan->id, ch_en, BIT(0));
> > + /* Interrupt enable&unmask - done, abort */
> > + tmp = GET_CH_32(dw, chan->dir, chan->id, int_setup);
> > + tmp |= HDMA_V0_STOP_INT_MASK;
> > + tmp |= HDMA_V0_ABORT_INT_MASK;
> > + tmp |= HDMA_V0_LOCAL_ABORT_INT_EN;
> > + tmp |= HDMA_V0_LOCAL_STOP_INT_EN;
> > + SET_CH_32(dw, chan->dir, chan->id, int_setup, tmp);
> > + /* Channel control */
> > + SET_CH_32(dw, chan->dir, chan->id, control1, HDMA_V0_LINKLIST_EN);
> > + /* Linked list */
> > + /* llp is not aligned on 64bit -> keep 32bit accesses */
> > + SET_CH_32(dw, chan->dir, chan->id, llp.lsb,
> > + lower_32_bits(chunk->ll_region.paddr));
> > + SET_CH_32(dw, chan->dir, chan->id, llp.msb,
> > + upper_32_bits(chunk->ll_region.paddr));
> > + }
> > + /* Doorbell */
> > + SET_CH_32(dw, chan->dir, chan->id, doorbell, HDMA_V0_DOORBELL_START);
> > +}
> > +
> > +int dw_hdma_v0_core_device_config(struct dw_edma_chan *chan)
> > +{
> > + struct dw_edma *dw = chan->dw;
> > +
> > + /* MSI done addr - low, high */
> > + SET_CH_32(dw, chan->dir, chan->id, msi_stop.lsb, chan->msi.address_lo);
> > + SET_CH_32(dw, chan->dir, chan->id, msi_stop.msb, chan->msi.address_hi);
> > + /* MSI abort addr - low, high */
> > + SET_CH_32(dw, chan->dir, chan->id, msi_abort.lsb, chan->msi.address_lo);
> > + SET_CH_32(dw, chan->dir, chan->id, msi_abort.msb, chan->msi.address_hi);
> > + SET_CH_32(dw, chan->dir, chan->id, msi_abort.msb, chan->msi.address_hi);
> > + /* config MSI data */
> > + SET_CH_32(dw, chan->dir, chan->id, msi_msgdata, chan->msi.data);
> > +
> > + return 0;
> > +}
> > +
> > +/* eDMA debugfs callbacks */
> > +void dw_hdma_v0_core_debugfs_on(struct dw_edma *dw)
> > +{
> > + dw_hdma_v0_debugfs_on(dw);
> > +}
> > +
> > +void dw_hdma_v0_core_debugfs_off(struct dw_edma *dw)
> > +{
> > + dw_hdma_v0_debugfs_off(dw);
> > +}
> > diff --git a/drivers/dma/dw-edma/dw-hdma-v0-core.h b/drivers/dma/dw-edma/dw-hdma-v0-core.h
> > new file mode 100644
> > index 000000000000..61d3a6d9d024
> > --- /dev/null
> > +++ b/drivers/dma/dw-edma/dw-hdma-v0-core.h
> > @@ -0,0 +1,27 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (c) 2022 Cai Huoqing
> > + * Synopsys DesignWare eDMA v0 core
> > + */
> > +
> > +#ifndef _DW_HDMA_V0_CORE_H
> > +#define _DW_HDMA_V0_CORE_H
> > +
> > +#include <linux/dma/edma.h>
> > +
> > +/* HDMA management callbacks */
> > +void dw_hdma_v0_core_off(struct dw_edma *chan);
> > +u16 dw_hdma_v0_core_ch_count(struct dw_edma *chan, enum dw_edma_dir dir);
> > +enum dma_status dw_hdma_v0_core_ch_status(struct dw_edma_chan *chan);
> > +void dw_hdma_v0_core_clear_done_int(struct dw_edma_chan *chan);
> > +void dw_hdma_v0_core_clear_abort_int(struct dw_edma_chan *chan);
> > +u32 dw_hdma_v0_core_status_int(struct dw_edma_chan *chan);
> > +u32 dw_hdma_v0_core_check_done_int(u32 val);
> > +u32 dw_hdma_v0_core_check_abort_int(u32 val);
> > +void dw_hdma_v0_core_start(struct dw_edma_chunk *chunk, bool first);
> > +int dw_hdma_v0_core_device_config(struct dw_edma_chan *chan);
> > +/* HDMA debug fs callbacks */
> > +void dw_hdma_v0_core_debugfs_on(struct dw_edma *dw);
> > +void dw_hdma_v0_core_debugfs_off(struct dw_edma *dw);
> > +
> > +#endif /* _DW_HDMA_V0_CORE_H */
> > diff --git a/drivers/dma/dw-edma/dw-hdma-v0-debugfs.c b/drivers/dma/dw-edma/dw-hdma-v0-debugfs.c
> > new file mode 100644
> > index 000000000000..2f1ddac9513b
> > --- /dev/null
> > +++ b/drivers/dma/dw-edma/dw-hdma-v0-debugfs.c
> > @@ -0,0 +1,167 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2022 Cai Huoqing
> > + * Synopsys DesignWare HDMA v0 debugfs
> > + */
> > +
> > +#include <linux/debugfs.h>
> > +#include <linux/bitfield.h>
> > +
> > +#include "dw-hdma-v0-debugfs.h"
> > +#include "dw-hdma-v0-regs.h"
> > +#include "dw-edma-core.h"
> > +
> > +#define REGS_ADDR(name) \
> > + ((void __force *)&regs->name)
> > +
> > +#define REGISTER(name) \
> > + { #name, REGS_ADDR(name) }
> > +
> > +#define WRITE_STR "write"
> > +#define READ_STR "read"
> > +#define CHANNEL_STR "channel"
> > +#define REGISTERS_STR "registers"
> > +
> > +static struct dw_edma *dw;
> > +static struct dw_hdma_v0_regs __iomem *regs;
> > +struct debugfs_entries {
> > + const char *name;
> > + dma_addr_t *reg;
> > +};
> > +
> > +static int dw_hdma_debugfs_u32_get(void *data, u64 *val)
> > +{
> > + void __iomem *reg = (void __force __iomem *)data;
> > + *val = readl(reg);
> > +
> > + return 0;
> > +}
> > +DEFINE_DEBUGFS_ATTRIBUTE(fops_x32, dw_hdma_debugfs_u32_get, NULL, "0x%08llx\n");
> > +
> > +static void dw_hdma_debugfs_create_x32(const struct debugfs_entries entries[],
> > + int nr_entries, struct dentry *dir)
> > +{
> > + int i;
> > +
> > + for (i = 0; i < nr_entries; i++) {
> > + if (!debugfs_create_file_unsafe(entries[i].name, 0444, dir,
> > + entries[i].reg, &fops_x32))
> > + break;
> > + }
> > +}
> > +
> > +static void dw_hdma_debugfs_regs_ch(struct dw_hdma_v0_ch_regs __iomem *regs,
> > + struct dentry *dir)
> > +{
> > + int nr_entries;
> > + const struct debugfs_entries debugfs_regs[] = {
> > + REGISTER(ch_en),
> > + REGISTER(doorbell),
> > + REGISTER(llp.lsb),
> > + REGISTER(llp.msb),
> > + REGISTER(cycle_sync),
> > + REGISTER(transfer_size),
> > + REGISTER(sar.lsb),
> > + REGISTER(sar.msb),
> > + REGISTER(dar.lsb),
> > + REGISTER(dar.msb),
> > + REGISTER(control1),
> > + REGISTER(ch_stat),
> > + REGISTER(int_stat),
> > + REGISTER(int_setup),
> > + REGISTER(int_clear),
> > + REGISTER(msi_stop.lsb),
> > + REGISTER(msi_stop.msb),
> > + REGISTER(msi_abort.lsb),
> > + REGISTER(msi_abort.msb),
> > + REGISTER(msi_msgdata),
> > + };
> > +
> > + nr_entries = ARRAY_SIZE(debugfs_regs);
> > + dw_hdma_debugfs_create_x32(debugfs_regs, nr_entries, dir);
> > +}
> > +
> > +static void dw_hdma_debugfs_regs_wr(struct dentry *dir)
> > +{
> > + struct dentry *regs_dir, *ch_dir;
> > + int i;
> > + char name[16];
> > +
> > + regs_dir = debugfs_create_dir(WRITE_STR, dir);
> > + if (!regs_dir)
> > + return;
> > +
> > + for (i = 0; i < dw->wr_ch_cnt; i++) {
> > + snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
> > +
> > + ch_dir = debugfs_create_dir(name, regs_dir);
> > + if (!ch_dir)
> > + return;
> > +
> > + dw_hdma_debugfs_regs_ch(&regs->ch[i].wr, ch_dir);
> > + }
> > +}
> > +
> > +static void dw_hdma_debugfs_regs_rd(struct dentry *dir)
> > +{
> > + struct dentry *regs_dir, *ch_dir;
> > + int i;
> > + char name[16];
> > +
> > + regs_dir = debugfs_create_dir(READ_STR, dir);
> > + if (!regs_dir)
> > + return;
> > +
> > + for (i = 0; i < dw->rd_ch_cnt; i++) {
> > + snprintf(name, sizeof(name), "%s:%d", CHANNEL_STR, i);
> > +
> > + ch_dir = debugfs_create_dir(name, regs_dir);
> > + if (!ch_dir)
> > + return;
> > +
> > + dw_hdma_debugfs_regs_ch(&regs->ch[i].rd, ch_dir);
> > + }
> > +}
> > +
> > +static void dw_hdma_debugfs_regs(void)
> > +{
> > + struct dentry *regs_dir;
> > +
> > + regs_dir = debugfs_create_dir(REGISTERS_STR, dw->debugfs);
> > + if (!regs_dir)
> > + return;
> > +
> > + dw_hdma_debugfs_regs_wr(regs_dir);
> > + dw_hdma_debugfs_regs_rd(regs_dir);
> > +}
> > +
> > +void dw_hdma_v0_debugfs_on(struct dw_edma *_dw)
> > +{
> > + dw = _dw;
> > + if (!dw)
> > + return;
> > +
> > + regs = dw->chip->reg_base;
> > + if (!regs)
> > + return;
> > +
> > + dw->debugfs = debugfs_create_dir(dw->name, NULL);
> > + if (!dw->debugfs)
> > + return;
> > +
> > + debugfs_create_u32("mf", 0444, dw->debugfs, &dw->chip->mf);
> > + debugfs_create_u16("wr_ch_cnt", 0444, dw->debugfs, &dw->wr_ch_cnt);
> > + debugfs_create_u16("rd_ch_cnt", 0444, dw->debugfs, &dw->rd_ch_cnt);
> > +
> > + dw_hdma_debugfs_regs();
> > +}
> > +
> > +void dw_hdma_v0_debugfs_off(struct dw_edma *_dw)
> > +{
> > + dw = _dw;
> > + if (!dw)
> > + return;
> > +
> > + debugfs_remove_recursive(dw->debugfs);
> > + dw->debugfs = NULL;
> > +}
> > diff --git a/drivers/dma/dw-edma/dw-hdma-v0-debugfs.h b/drivers/dma/dw-edma/dw-hdma-v0-debugfs.h
> > new file mode 100644
> > index 000000000000..53bc7e93f4a0
> > --- /dev/null
> > +++ b/drivers/dma/dw-edma/dw-hdma-v0-debugfs.h
> > @@ -0,0 +1,25 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (c) 2022 Cai Huoqing
> > + * Synopsys DesignWare HDMA v0 debugfs
> > + */
> > +
> > +#ifndef _DW_HDMA_V0_DEBUG_FS_H
> > +#define _DW_HDMA_V0_DEBUG_FS_H
> > +
> > +#include <linux/dma/edma.h>
> > +
> > +#ifdef CONFIG_DEBUG_FS
> > +void dw_hdma_v0_debugfs_on(struct dw_edma *dw);
> > +void dw_hdma_v0_debugfs_off(struct dw_edma *dw);
> > +#else
> > +static inline void dw_hdma_v0_debugfs_on(struct dw_edma *dw)
> > +{
> > +}
> > +
> > +static inline void dw_hdma_v0_debugfs_off(struct dw_edma *dw)
> > +{
> > +}
> > +#endif /* CONFIG_DEBUG_FS */
> > +
> > +#endif /* _DW_HDMA_V0_DEBUG_FS_H */
> > diff --git a/drivers/dma/dw-edma/dw-hdma-v0-regs.h b/drivers/dma/dw-edma/dw-hdma-v0-regs.h
> > new file mode 100644
> > index 000000000000..2a2a3620d809
> > --- /dev/null
> > +++ b/drivers/dma/dw-edma/dw-hdma-v0-regs.h
> > @@ -0,0 +1,94 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * Copyright (c) 2022 Cai Huoqing
> > + * Synopsys DesignWare HDMA v0 reg
> > + */
> > +
> > +#ifndef _DW_HDMA_V0_REGS_H
> > +#define _DW_HDMA_V0_REGS_H
> > +
> > +#include <linux/dmaengine.h>
> > +
> > +#define HDMA_V0_MAX_NR_CH 8
> > +#define HDMA_V0_LOCAL_ABORT_INT_EN BIT(6)
> > +#define HDMA_V0_REMOTE_ABORT_INT_EN BIT(5)
> > +#define HDMA_V0_LOCAL_STOP_INT_EN BIT(4)
> > +#define HDMA_V0_REMOTEL_STOP_INT_EN BIT(3)
> > +#define HDMA_V0_ABORT_INT_MASK BIT(2)
> > +#define HDMA_V0_STOP_INT_MASK BIT(0)
> > +#define HDMA_V0_LINKLIST_EN BIT(0)
> > +#define HDMA_V0_DOORBELL_START BIT(0)
> > +#define HDMA_V0_CH_STATUS_MASK GENMASK(1, 0)
> > +
> > +struct dw_hdma_v0_ch_regs {
> > + u32 ch_en; /* 0x0000 */
> > + u32 doorbell; /* 0x0004 */
> > + u32 prefetch; /* 0x0008 */
> > + u32 handshake; /* 0x000c */
> > + union {
> > + u64 reg; /* 0x0010..0x0014 */
> > + struct {
> > + u32 lsb; /* 0x0010 */
> > + u32 msb; /* 0x0014 */
> > + };
> > + } llp;
> > + u32 cycle_sync; /* 0x0018 */
> > + u32 transfer_size; /* 0x001c */
> > + union {
> > + u64 reg; /* 0x0020..0x0024 */
> > + struct {
> > + u32 lsb; /* 0x0020 */
> > + u32 msb; /* 0x0024 */
> > + };
> > + } sar;
> > + union {
> > + u64 reg; /* 0x0028..0x002c */
> > + struct {
> > + u32 lsb; /* 0x0028 */
> > + u32 msb; /* 0x002c */
> > + };
> > + } dar;
> > +
> > + u32 watermark_en; /* 0x0030 */
> > + u32 control1; /* 0x0034 */
> > + u32 func_num; /* 0x0038 */
> > + u32 qos; /* 0x003c */
> > + u32 reserved; /* 0x0040..0x007c */
> > + u32 ch_stat; /* 0x0080 */
> > + u32 int_stat; /* 0x0084 */
> > + u32 int_setup; /* 0x0088 */
> > + u32 int_clear; /* 0x008c */
> > + union {
> > + u64 reg; /* 0x0090..0x0094 */
> > + struct {
> > + u32 lsb; /* 0x0090 */
> > + u32 msb; /* 0x0094 */
> > + };
> > + } msi_stop;
> > + union {
> > + u64 reg; /* 0x0098..0x009c */
> > + struct {
> > + u32 lsb; /* 0x0098 */
> > + u32 msb; /* 0x009c */
> > + };
> > + } msi_watermark;
> > + union {
> > + u64 reg; /* 0x00a0..0x00a4 */
> > + struct {
> > + u32 lsb; /* 0x00a0 */
> > + u32 msb; /* 0x00a4 */
> > + };
> > + } msi_abort;
> > + u32 msi_msgdata; /* 0x00a8 */
> > +} __packed;
> > +
> > +struct dw_hdma_v0_ch {
> > + struct dw_hdma_v0_ch_regs wr; /* 0x0000 */
> > + struct dw_hdma_v0_ch_regs rd; /* 0x0100 */
> > +} __packed;
> > +
> > +struct dw_hdma_v0_regs {
> > + struct dw_hdma_v0_ch ch[HDMA_V0_MAX_NR_CH]; /* 0x0000..0x0fa8 */
> > +} __packed;
> > +
> > +#endif /* _DW_HDMA_V0_REGS_H */
> > diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h
> > index 7d8062e9c544..a379b599c7fa 100644
> > --- a/include/linux/dma/edma.h
> > +++ b/include/linux/dma/edma.h
> > @@ -30,7 +30,8 @@ struct dw_edma_core_ops {
> > enum dw_edma_map_format {
> > EDMA_MF_EDMA_LEGACY = 0x0,
> > EDMA_MF_EDMA_UNROLL = 0x1,
> > - EDMA_MF_HDMA_COMPAT = 0x5
> > + EDMA_MF_HDMA_COMPAT = 0x5,
> > + EDMA_MF_HDMA_NATIVE = 0x7
> > };
> >
> > /**
> > --
> > 2.25.1
> >