Re: [PATCH 2/3] dmaengine: dw-edma: Create a new dw_edma_core_ops structure to abstract controller operation

From: Serge Semin
Date: Thu Feb 09 2023 - 19:59:10 EST

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On Fri, Nov 04, 2022 at 07:15:00PM +0530, Vinod Koul wrote:
> On 21-09-22, 14:48, Cai Huoqing wrote:
> > From: caihuoqing <caihuoqing@xxxxxxxxx>
> >
> > The structure dw_edma_core_ops has a set of the pointers
> > abstracting out the DW eDMA vX and DW HDMA Native controllers.
> > And use dw_edma_v0_core_register to set up operation.
>

> Core can mean different things, why not call it
> dw_edma_v0_{controller|cntrl}_regs

In this case it refers to the DW eDMA and HDMA IP-cores and to the
driver core where their specifics are implemented. In the later
aspects it just reflects the already defined naming conventions:
dw-edma-core.c
dw-edma-v0-core.c
dw_edma_v0_core_off()
dw_edma_v0_core_ch_count()
dw_edma_v0_core_ch_status()
dw_edma_v0_core_clear_done_int()
dw_edma_v0_core_clear_abort_int()
dw_edma_v0_core_status_done_int()
dw_edma_v0_core_status_abort_int()
dw_edma_v0_core_write_chunk()
dw_edma_v0_core_start()
dw_edma_v0_core_device_config()
dw_edma_v0_core_debugfs_on()
dw_edma_v0_core_debugfs_off()
introducing a new name may cause a redundant confusion meanwhile using
the same suffix for all driver core, device implementation specific
callbacks and operations descriptor would give a better readability.
Don't you think?

I also don't think that the "_regs" suffix looks better here.
"_ops" seems more descriptive. Do you think otherwise?

-Serge(y)

>
> > Signed-off-by: caihuoqing <caihuoqing@xxxxxxxxx>
> > ---
> > drivers/dma/dw-edma/dw-edma-core.c | 61 ++++++------------
> > drivers/dma/dw-edma/dw-edma-core.h | 19 ++++++
> > drivers/dma/dw-edma/dw-edma-v0-core.c | 90 ++++++++++++++++++++++++---
> > drivers/dma/dw-edma/dw-edma-v0-core.h | 14 +----
> > 4 files changed, 120 insertions(+), 64 deletions(-)
> >
> > diff --git a/drivers/dma/dw-edma/dw-edma-core.c b/drivers/dma/dw-edma/dw-edma-core.c
> > index 5736a537f4c8..a66e4216a5d3 100644
> > --- a/drivers/dma/dw-edma/dw-edma-core.c
> > +++ b/drivers/dma/dw-edma/dw-edma-core.c
> > @@ -187,6 +187,7 @@ 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)
> > @@ -201,7 +202,7 @@ static void dw_edma_start_transfer(struct dw_edma_chan *chan)
> > if (!child)
> > return;
> >
> > - dw_edma_v0_core_start(child, !desc->xfer_sz);
> > + dw->core->dw_xdma_core_start(child, !desc->xfer_sz);
> > desc->xfer_sz += child->ll_region.sz;
> > dw_edma_free_burst(child);
> > list_del(&child->list);
> > @@ -277,6 +278,7 @@ 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;
> > int err = 0;
> >
> > if (!chan->configured) {
> > @@ -286,7 +288,7 @@ 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 (dw->core->dw_xdma_core_ch_status(chan) == DMA_COMPLETE) {
> > /*
> > * The channel is in a false BUSY state, probably didn't
> > * receive or lost an interrupt
> > @@ -593,9 +595,10 @@ static void dw_edma_done_interrupt(struct dw_edma_chan *chan)
> > {
> > struct dw_edma_desc *desc;
> > struct virt_dma_desc *vd;
> > + struct dw_edma *dw = chan->dw;
> > unsigned long flags;
> >
> > - dw_edma_v0_core_clear_done_int(chan);
> > + dw->core->dw_xdma_core_clear_done_int(chan);
> >
> > spin_lock_irqsave(&chan->vc.lock, flags);
> > vd = vchan_next_desc(&chan->vc);
> > @@ -635,9 +638,10 @@ 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);
> > + dw->core->dw_xdma_core_clear_abort_int(chan);
> >
> > spin_lock_irqsave(&chan->vc.lock, flags);
> > vd = vchan_next_desc(&chan->vc);
> > @@ -654,39 +658,10 @@ 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 off;
> > - u32 mask;
> > -
> > - if (write) {
> > - total = dw->wr_ch_cnt;
> > - off = 0;
> > - mask = dw_irq->wr_mask;
> > - } else {
> > - total = dw->rd_ch_cnt;
> > - off = dw->wr_ch_cnt;
> > - 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];
> > -
> > - 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];
> > + enum dw_edma_dir dir = write ? EDMA_DIR_WRITE : EDMA_DIR_READ;
> >
> > - dw_edma_abort_interrupt(chan);
> > - }
> > + dw->core->dw_xdma_core_done_handle(dw_irq, dw_edma_done_interrupt, dir);
> > + dw->core->dw_xdma_core_abort_handle(dw_irq, dw_edma_abort_interrupt, dir);
> >
> > return IRQ_HANDLED;
> > }
> > @@ -832,7 +807,7 @@ static int dw_edma_channel_setup(struct dw_edma *dw, u32 wr_alloc, u32 rd_alloc)
> >
> > vchan_init(&chan->vc, dma);
> >
> > - dw_edma_v0_core_device_config(chan);
> > + dw->core->dw_xdma_core_ch_config(chan);
> > }
> >
> > /* Set DMA channel capabilities */
> > @@ -977,14 +952,16 @@ int dw_edma_probe(struct dw_edma_chip *chip)
> >
> > dw->chip = chip;
> >
> > + dw_edma_v0_core_register(dw);
> > +
> > 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->core->dw_xdma_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->core->dw_xdma_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)
> > @@ -1003,7 +980,7 @@ int dw_edma_probe(struct dw_edma_chip *chip)
> > dev_name(chip->dev));
> >
> > /* Disable eDMA, only to establish the ideal initial conditions */
> > - dw_edma_v0_core_off(dw);
> > + dw->core->dw_xdma_core_off(dw);
> >
> > /* Request IRQs */
> > err = dw_edma_irq_request(dw, &wr_alloc, &rd_alloc);
> > @@ -1019,7 +996,7 @@ int dw_edma_probe(struct dw_edma_chip *chip)
> > pm_runtime_enable(dev);
> >
> > /* Turn debugfs on */
> > - dw_edma_v0_core_debugfs_on(dw);
> > + dw->core->dw_xdma_core_debugfs_on(dw);
> >
> > chip->dw = dw;
> >
> > @@ -1045,7 +1022,7 @@ int dw_edma_remove(struct dw_edma_chip *chip)
> > return -ENODEV;
> >
> > /* Disable eDMA */
> > - dw_edma_v0_core_off(dw);
> > + dw->core->dw_xdma_core_off(dw);
> >
> > /* Free irqs */
> > for (i = (dw->nr_irqs - 1); i >= 0; i--)
> > diff --git a/drivers/dma/dw-edma/dw-edma-core.h b/drivers/dma/dw-edma/dw-edma-core.h
> > index 0ab2b6dba880..9b472d3c1596 100644
> > --- a/drivers/dma/dw-edma/dw-edma-core.h
> > +++ b/drivers/dma/dw-edma/dw-edma-core.h
> > @@ -95,6 +95,23 @@ struct dw_edma_irq {
> > struct dw_edma *dw;
> > };
> >
> > +struct dw_edma_core_ops {
> > + void (*dw_xdma_core_off)(struct dw_edma *dw);
> > + u16 (*dw_xdma_core_ch_count)(struct dw_edma *dw, enum dw_edma_dir dir);
> > + enum dma_status (*dw_xdma_core_ch_status)(struct dw_edma_chan *chan);
> > + void (*dw_xdma_core_clear_done_int)(struct dw_edma_chan *chan);
> > + void (*dw_xdma_core_clear_abort_int)(struct dw_edma_chan *chan);
> > + void (*dw_xdma_core_done_handle)(struct dw_edma_irq *dw_irq,
> > + void (*done_cb)(struct dw_edma_chan *chan),
> > + enum dw_edma_dir dir);
> > + void (*dw_xdma_core_abort_handle)(struct dw_edma_irq *dw_irq,
> > + void (*abort_cb)(struct dw_edma_chan *chan),
> > + enum dw_edma_dir dir);
> > + void (*dw_xdma_core_start)(struct dw_edma_chunk *chunk, bool first);
> > + int (*dw_xdma_core_ch_config)(struct dw_edma_chan *chan);
> > + void (*dw_xdma_core_debugfs_on)(struct dw_edma *dw);
> > +};
> > +
> > struct dw_edma {
> > char name[32];
> >
> > @@ -111,6 +128,8 @@ struct dw_edma {
> > raw_spinlock_t lock; /* Only for legacy */
> >
> > struct dw_edma_chip *chip;
> > +
> > + const struct dw_edma_core_ops *core;
> > };
> >
> > struct dw_edma_sg {
> > diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.c b/drivers/dma/dw-edma/dw-edma-v0-core.c
> > index 51a34b43434c..0c1a74245ecc 100644
> > --- a/drivers/dma/dw-edma/dw-edma-v0-core.c
> > +++ b/drivers/dma/dw-edma/dw-edma-v0-core.c
> > @@ -223,7 +223,7 @@ static inline u64 readq_ch(struct dw_edma *dw, enum dw_edma_dir dir, u16 ch,
> > writeq(value, ll)
> >
> > /* eDMA management callbacks */
> > -void dw_edma_v0_core_off(struct dw_edma *dw)
> > +static void dw_edma_v0_core_off(struct dw_edma *dw)
> > {
> > SET_BOTH_32(dw, int_mask,
> > EDMA_V0_DONE_INT_MASK | EDMA_V0_ABORT_INT_MASK);
> > @@ -232,7 +232,7 @@ void dw_edma_v0_core_off(struct dw_edma *dw)
> > SET_BOTH_32(dw, engine_en, 0);
> > }
> >
> > -u16 dw_edma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir)
> > +static u16 dw_edma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir)
> > {
> > u32 num_ch;
> >
> > @@ -249,7 +249,7 @@ u16 dw_edma_v0_core_ch_count(struct dw_edma *dw, enum dw_edma_dir dir)
> > return (u16)num_ch;
> > }
> >
> > -enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan)
> > +static enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan)
> > {
> > struct dw_edma *dw = chan->dw;
> > u32 tmp;
> > @@ -265,7 +265,7 @@ enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan)
> > return DMA_ERROR;
> > }
> >
> > -void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan)
> > +static void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan)
> > {
> > struct dw_edma *dw = chan->dw;
> >
> > @@ -273,7 +273,7 @@ void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan)
> > FIELD_PREP(EDMA_V0_DONE_INT_MASK, BIT(chan->id)));
> > }
> >
> > -void dw_edma_v0_core_clear_abort_int(struct dw_edma_chan *chan)
> > +static void dw_edma_v0_core_clear_abort_int(struct dw_edma_chan *chan)
> > {
> > struct dw_edma *dw = chan->dw;
> >
> > @@ -281,18 +281,70 @@ void dw_edma_v0_core_clear_abort_int(struct dw_edma_chan *chan)
> > FIELD_PREP(EDMA_V0_ABORT_INT_MASK, BIT(chan->id)));
> > }
> >
> > -u32 dw_edma_v0_core_status_done_int(struct dw_edma *dw, enum dw_edma_dir dir)
> > +static u32 dw_edma_v0_core_status_done_int(struct dw_edma *dw, enum dw_edma_dir dir)
> > {
> > return FIELD_GET(EDMA_V0_DONE_INT_MASK,
> > GET_RW_32(dw, dir, int_status));
> > }
> >
> > -u32 dw_edma_v0_core_status_abort_int(struct dw_edma *dw, enum dw_edma_dir dir)
> > +static u32 dw_edma_v0_core_status_abort_int(struct dw_edma *dw, enum dw_edma_dir dir)
> > {
> > return FIELD_GET(EDMA_V0_ABORT_INT_MASK,
> > GET_RW_32(dw, dir, int_status));
> > }
> >
> > +static
> > +void dw_edma_v0_core_done_handle(struct dw_edma_irq *dw_irq,
> > + void (*done_cb)(struct dw_edma_chan *chan),
> > + enum dw_edma_dir dir)
> > +{
> > + struct dw_edma *dw = dw_irq->dw;
> > + unsigned long total, pos, val;
> > + unsigned long off;
> > + u32 mask;
> > +
> > + if (dir == EDMA_DIR_WRITE) {
> > + total = dw->wr_ch_cnt;
> > + off = 0;
> > + mask = dw_irq->wr_mask;
> > + } else {
> > + total = dw->rd_ch_cnt;
> > + off = dw->wr_ch_cnt;
> > + mask = dw_irq->rd_mask;
> > + }
> > +
> > + val = dw_edma_v0_core_status_done_int(dw, dir);
> > + val &= mask;
> > + for_each_set_bit(pos, &val, total)
> > + done_cb(&dw->chan[pos + off]);
> > +}
> > +
> > +static
> > +void dw_edma_v0_core_abort_handle(struct dw_edma_irq *dw_irq,
> > + void (*abort_cb)(struct dw_edma_chan *chan),
> > + enum dw_edma_dir dir)
> > +{
> > + struct dw_edma *dw = dw_irq->dw;
> > + unsigned long total, pos, val;
> > + unsigned long off;
> > + u32 mask;
> > +
> > + if (dir == EDMA_DIR_WRITE) {
> > + total = dw->wr_ch_cnt;
> > + off = 0;
> > + mask = dw_irq->wr_mask;
> > + } else {
> > + total = dw->rd_ch_cnt;
> > + off = dw->wr_ch_cnt;
> > + mask = dw_irq->rd_mask;
> > + }
> > +
> > + val = dw_edma_v0_core_status_abort_int(dw, dir);
> > + val &= mask;
> > + for_each_set_bit(pos, &val, total)
> > + abort_cb(&dw->chan[pos + off]);
> > +}
> > +
> > static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
> > {
> > struct dw_edma_burst *child;
> > @@ -338,7 +390,7 @@ static void dw_edma_v0_core_write_chunk(struct dw_edma_chunk *chunk)
> > SET_LL_64(&llp->llp.reg, chunk->ll_region.paddr);
> > }
> >
> > -void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
> > +static void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
> > {
> > struct dw_edma_chan *chan = chunk->chan;
> > struct dw_edma *dw = chan->dw;
> > @@ -409,7 +461,7 @@ void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first)
> > FIELD_PREP(EDMA_V0_DOORBELL_CH_MASK, chan->id));
> > }
> >
> > -int dw_edma_v0_core_device_config(struct dw_edma_chan *chan)
> > +static int dw_edma_v0_core_ch_config(struct dw_edma_chan *chan)
> > {
> > struct dw_edma *dw = chan->dw;
> > u32 tmp = 0;
> > @@ -481,7 +533,25 @@ int dw_edma_v0_core_device_config(struct dw_edma_chan *chan)
> > }
> >
> > /* eDMA debugfs callbacks */
> > -void dw_edma_v0_core_debugfs_on(struct dw_edma *dw)
> > +static void dw_edma_v0_core_debugfs_on(struct dw_edma *dw)
> > {
> > dw_edma_v0_debugfs_on(dw);
> > }
> > +
> > +static const struct dw_edma_core_ops edma_core = {
> > + .dw_xdma_core_off = dw_edma_v0_core_off,
> > + .dw_xdma_core_ch_count = dw_edma_v0_core_ch_count,
> > + .dw_xdma_core_ch_status = dw_edma_v0_core_ch_status,
> > + .dw_xdma_core_clear_done_int = dw_edma_v0_core_clear_done_int,
> > + .dw_xdma_core_clear_abort_int = dw_edma_v0_core_clear_abort_int,
> > + .dw_xdma_core_done_handle = dw_edma_v0_core_done_handle,
> > + .dw_xdma_core_abort_handle = dw_edma_v0_core_abort_handle,
> > + .dw_xdma_core_start = dw_edma_v0_core_start,
> > + .dw_xdma_core_ch_config = dw_edma_v0_core_ch_config,
> > + .dw_xdma_core_debugfs_on = dw_edma_v0_core_debugfs_on,
>
> dw_xdma_ctrl_xxx sounds more right for these
>
> > +};
> > +
> > +void dw_edma_v0_core_register(struct dw_edma *dw)
> > +{
> > + dw->core = &edma_core;
> > +}
> > diff --git a/drivers/dma/dw-edma/dw-edma-v0-core.h b/drivers/dma/dw-edma/dw-edma-v0-core.h
> > index ab96a1f48080..972994ecc96f 100644
> > --- a/drivers/dma/dw-edma/dw-edma-v0-core.h
> > +++ b/drivers/dma/dw-edma/dw-edma-v0-core.h
> > @@ -11,17 +11,7 @@
> >
> > #include <linux/dma/edma.h>
> >
> > -/* eDMA management callbacks */
> > -void dw_edma_v0_core_off(struct dw_edma *chan);
> > -u16 dw_edma_v0_core_ch_count(struct dw_edma *chan, enum dw_edma_dir dir);
> > -enum dma_status dw_edma_v0_core_ch_status(struct dw_edma_chan *chan);
> > -void dw_edma_v0_core_clear_done_int(struct dw_edma_chan *chan);
> > -void dw_edma_v0_core_clear_abort_int(struct dw_edma_chan *chan);
> > -u32 dw_edma_v0_core_status_done_int(struct dw_edma *chan, enum dw_edma_dir dir);
> > -u32 dw_edma_v0_core_status_abort_int(struct dw_edma *chan, enum dw_edma_dir dir);
> > -void dw_edma_v0_core_start(struct dw_edma_chunk *chunk, bool first);
> > -int dw_edma_v0_core_device_config(struct dw_edma_chan *chan);
> > -/* eDMA debug fs callbacks */
> > -void dw_edma_v0_core_debugfs_on(struct dw_edma *dw);
> > +/* eDMA core operation register*/
> > +void dw_edma_v0_core_register(struct dw_edma *dw);
> >
> > #endif /* _DW_EDMA_V0_CORE_H */
> > --
> > 2.25.1
>
> --
> ~Vinod

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