[PATCH v11 10/12] dmaengine: fsl-edma: move tcd into struct fsl_dma_chan

From: Frank Li
Date: Mon Aug 21 2023 - 12:18:42 EST

Relocates the tcd into the fsl_dma_chan structure. This adjustment reduces
the need to reference back to fsl_edma_engine, paving the way for EDMA V3
support.

Unified the edma_writel and edma_writew functions for accessing TCD
(Transfer Control Descriptor) registers. A new macro is added that can
automatically detect whether a 32-bit or 16-bit access should be used
based on the structure field definition. This provide better support
64-bit TCD with future v5 version.

Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202305271951.gmRobs3a-lkp@xxxxxxxxx/
Signed-off-by: Frank Li <Frank.Li@xxxxxxx>
---
drivers/dma/fsl-edma-common.c | 38 +++++++++++++----------------------
drivers/dma/fsl-edma-common.h | 22 +++++++++++++++++++-
drivers/dma/fsl-edma-main.c | 6 ++++--
drivers/dma/mcf-edma-main.c | 4 +++-
4 files changed, 42 insertions(+), 28 deletions(-)

diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c
index e0f914616c5f..13c328728025 100644
--- a/drivers/dma/fsl-edma-common.c
+++ b/drivers/dma/fsl-edma-common.c
@@ -40,8 +40,6 @@
#define EDMA64_ERRH 0x28
#define EDMA64_ERRL 0x2c

-#define EDMA_TCD 0x1000
-
void fsl_edma_tx_chan_handler(struct fsl_edma_chan *fsl_chan)
{
spin_lock(&fsl_chan->vchan.lock);
@@ -285,8 +283,6 @@ 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;
- struct edma_regs *regs = &fsl_chan->edma->regs;
- u32 ch = fsl_chan->vchan.chan.chan_id;
enum dma_transfer_direction dir = edesc->dirn;
dma_addr_t cur_addr, dma_addr;
size_t len, size;
@@ -301,9 +297,9 @@ static size_t fsl_edma_desc_residue(struct fsl_edma_chan *fsl_chan,
return len;

if (dir == DMA_MEM_TO_DEV)
- cur_addr = edma_readl(fsl_chan->edma, &regs->tcd[ch].saddr);
+ cur_addr = edma_read_tcdreg(fsl_chan, saddr);
else
- cur_addr = edma_readl(fsl_chan->edma, &regs->tcd[ch].daddr);
+ cur_addr = edma_read_tcdreg(fsl_chan, daddr);

/* figure out the finished and calculate the residue */
for (i = 0; i < fsl_chan->edesc->n_tcds; i++) {
@@ -358,9 +354,6 @@ enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
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;
- struct edma_regs *regs = &fsl_chan->edma->regs;
- u32 ch = fsl_chan->vchan.chan.chan_id;
u16 csr = 0;

/*
@@ -369,23 +362,22 @@ static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
* big- or little-endian obeying the eDMA engine model endian,
* and this is performed from specific edma_write functions
*/
- edma_writew(edma, 0, &regs->tcd[ch].csr);
+ edma_write_tcdreg(fsl_chan, 0, csr);

- edma_writel(edma, (s32)tcd->saddr, &regs->tcd[ch].saddr);
- edma_writel(edma, (s32)tcd->daddr, &regs->tcd[ch].daddr);
+ edma_write_tcdreg(fsl_chan, tcd->saddr, saddr);
+ edma_write_tcdreg(fsl_chan, tcd->daddr, daddr);

- edma_writew(edma, (s16)tcd->attr, &regs->tcd[ch].attr);
- edma_writew(edma, tcd->soff, &regs->tcd[ch].soff);
+ edma_write_tcdreg(fsl_chan, tcd->attr, attr);
+ edma_write_tcdreg(fsl_chan, tcd->soff, soff);

- edma_writel(edma, (s32)tcd->nbytes, &regs->tcd[ch].nbytes);
- edma_writel(edma, (s32)tcd->slast, &regs->tcd[ch].slast);
+ edma_write_tcdreg(fsl_chan, tcd->nbytes, nbytes);
+ edma_write_tcdreg(fsl_chan, tcd->slast, slast);

- edma_writew(edma, (s16)tcd->citer, &regs->tcd[ch].citer);
- edma_writew(edma, (s16)tcd->biter, &regs->tcd[ch].biter);
- edma_writew(edma, (s16)tcd->doff, &regs->tcd[ch].doff);
+ edma_write_tcdreg(fsl_chan, tcd->citer, citer);
+ edma_write_tcdreg(fsl_chan, tcd->biter, biter);
+ edma_write_tcdreg(fsl_chan, tcd->doff, doff);

- edma_writel(edma, (s32)tcd->dlast_sga,
- &regs->tcd[ch].dlast_sga);
+ edma_write_tcdreg(fsl_chan, tcd->dlast_sga, dlast_sga);

if (fsl_chan->is_sw) {
csr = le16_to_cpu(tcd->csr);
@@ -393,7 +385,7 @@ static void fsl_edma_set_tcd_regs(struct fsl_edma_chan *fsl_chan,
tcd->csr = cpu_to_le16(csr);
}

- edma_writew(edma, (s16)tcd->csr, &regs->tcd[ch].csr);
+ edma_write_tcdreg(fsl_chan, tcd->csr, csr);
}

static inline
@@ -736,8 +728,6 @@ void fsl_edma_setup_regs(struct fsl_edma_engine *edma)
edma->regs.errh = edma->membase + EDMA64_ERRH;
edma->regs.inth = edma->membase + EDMA64_INTH;
}
-
- edma->regs.tcd = edma->membase + EDMA_TCD;
}

MODULE_LICENSE("GPL v2");
diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h
index 316df42ae5cb..cfc41915eaa1 100644
--- a/drivers/dma/fsl-edma-common.h
+++ b/drivers/dma/fsl-edma-common.h
@@ -48,6 +48,8 @@

#define DMAMUX_NR 2

+#define EDMA_TCD 0x1000
+
#define FSL_EDMA_BUSWIDTHS (BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
@@ -93,7 +95,6 @@ struct edma_regs {
void __iomem *intl;
void __iomem *errh;
void __iomem *errl;
- struct fsl_edma_hw_tcd __iomem *tcd;
};

struct fsl_edma_sw_tcd {
@@ -117,6 +118,7 @@ struct fsl_edma_chan {
u32 dma_dev_size;
enum dma_data_direction dma_dir;
char chan_name[32];
+ struct fsl_edma_hw_tcd __iomem *tcd;
};

struct fsl_edma_desc {
@@ -156,6 +158,16 @@ struct fsl_edma_engine {
struct fsl_edma_chan chans[];
};

+#define edma_read_tcdreg(chan, __name) \
+(sizeof(chan->tcd->__name) == sizeof(u32) ? \
+ edma_readl(chan->edma, &chan->tcd->__name) : \
+ edma_readw(chan->edma, &chan->tcd->__name))
+
+#define edma_write_tcdreg(chan, val, __name) \
+(sizeof(chan->tcd->__name) == sizeof(u32) ? \
+ edma_writel(chan->edma, (u32 __force)val, &chan->tcd->__name) : \
+ edma_writew(chan->edma, (u16 __force)val, &chan->tcd->__name))
+
/*
* R/W functions for big- or little-endian registers:
* The eDMA controller's endian is independent of the CPU core's endian.
@@ -170,6 +182,14 @@ static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
return ioread32(addr);
}

+static inline u16 edma_readw(struct fsl_edma_engine *edma, void __iomem *addr)
+{
+ if (edma->big_endian)
+ return ioread16be(addr);
+ else
+ return ioread16(addr);
+}
+
static inline void edma_writeb(struct fsl_edma_engine *edma,
u8 val, void __iomem *addr)
{
diff --git a/drivers/dma/fsl-edma-main.c b/drivers/dma/fsl-edma-main.c
index d68ea16ddf1b..72b7587226df 100644
--- a/drivers/dma/fsl-edma-main.c
+++ b/drivers/dma/fsl-edma-main.c
@@ -320,9 +320,11 @@ static int fsl_edma_probe(struct platform_device *pdev)
fsl_chan->idle = true;
fsl_chan->dma_dir = DMA_NONE;
fsl_chan->vchan.desc_free = fsl_edma_free_desc;
+ fsl_chan->tcd = fsl_edma->membase + EDMA_TCD
+ + i * sizeof(struct fsl_edma_hw_tcd);
vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev);

- edma_writew(fsl_edma, 0x0, &regs->tcd[i].csr);
+ edma_write_tcdreg(fsl_chan, 0, csr);
fsl_edma_chan_mux(fsl_chan, 0, false);
}

@@ -430,7 +432,7 @@ static int fsl_edma_resume_early(struct device *dev)
for (i = 0; i < fsl_edma->n_chans; i++) {
fsl_chan = &fsl_edma->chans[i];
fsl_chan->pm_state = RUNNING;
- edma_writew(fsl_edma, 0x0, &regs->tcd[i].csr);
+ edma_write_tcdreg(fsl_chan, 0, csr);
if (fsl_chan->slave_id != 0)
fsl_edma_chan_mux(fsl_chan, fsl_chan->slave_id, true);
}
diff --git a/drivers/dma/mcf-edma-main.c b/drivers/dma/mcf-edma-main.c
index ec8a8e1930b5..a903461da5bd 100644
--- a/drivers/dma/mcf-edma-main.c
+++ b/drivers/dma/mcf-edma-main.c
@@ -199,7 +199,9 @@ static int mcf_edma_probe(struct platform_device *pdev)
mcf_chan->dma_dir = DMA_NONE;
mcf_chan->vchan.desc_free = fsl_edma_free_desc;
vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev);
- iowrite32(0x0, &regs->tcd[i].csr);
+ mcf_chan->tcd = mcf_edma->membase + EDMA_TCD
+ + i * sizeof(struct fsl_edma_hw_tcd);
+ iowrite32(0x0, &mcf_chan->tcd->csr);
}

iowrite32(~0, regs->inth);
--
2.34.1