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Date: Thu, 5 Oct 2023 14:36:38 +0300
From: Sergey Khimich <serghox@...il.com>
To: linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org
Cc: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
Vinod Koul <vkoul@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>
Subject: [PATCH] dmaengine: dw-axi-dmac: Add support DMAX_NUM_CHANNELS > 16
From: Sergey Khimich <serghox@...il.com>
Added support for DMA controller with more than 16 channels.
Signed-off-by: Sergey Khimich <serghox@...il.com>
---
.../dma/dw-axi-dmac/dw-axi-dmac-platform.c | 156 +++++++++++++-----
drivers/dma/dw-axi-dmac/dw-axi-dmac.h | 6 +-
2 files changed, 120 insertions(+), 42 deletions(-)
diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
index dd02f84e404d..984e953046c4 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -62,6 +62,17 @@ static inline u32 axi_dma_ioread32(struct axi_dma_chip *chip, u32 reg)
return ioread32(chip->regs + reg);
}
+static inline void
+axi_dma_iowrite64(struct axi_dma_chip *chip, u32 reg, u64 val)
+{
+ iowrite64(val, chip->regs + reg);
+}
+
+static inline u64 axi_dma_ioread64(struct axi_dma_chip *chip, u32 reg)
+{
+ return ioread64(chip->regs + reg);
+}
+
static inline void
axi_chan_iowrite32(struct axi_dma_chan *chan, u32 reg, u32 val)
{
@@ -182,38 +193,73 @@ static inline u32 axi_chan_irq_read(struct axi_dma_chan *chan)
static inline void axi_chan_disable(struct axi_dma_chan *chan)
{
- u32 val;
-
- val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
- val &= ~(BIT(chan->id) << DMAC_CHAN_EN_SHIFT);
- if (chan->chip->dw->hdata->reg_map_8_channels)
- val |= BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
- else
- val |= BIT(chan->id) << DMAC_CHAN_EN2_WE_SHIFT;
- axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
+ u64 val;
+
+ if (chan->chip->dw->hdata->nr_channels >= DMAC_CHAN_16) {
+ val = axi_dma_ioread64(chan->chip, DMAC_CHEN);
+ if (chan->id >= DMAC_CHAN_16) {
+ val &= ~((BIT(chan->id) >> DMAC_CHAN_16)
+ << (DMAC_CHAN_EN_SHIFT + DMAC_CHAN_BLOCK_SHIFT));
+ val |= (BIT(chan->id) >> DMAC_CHAN_16)
+ << (DMAC_CHAN_EN2_WE_SHIFT + DMAC_CHAN_BLOCK_SHIFT);
+ } else {
+ val &= ~(BIT(chan->id) << DMAC_CHAN_EN_SHIFT);
+ val |= BIT(chan->id) << DMAC_CHAN_EN2_WE_SHIFT;
+ }
+ axi_dma_iowrite64(chan->chip, DMAC_CHEN, val);
+ } else {
+ val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+ val &= ~(BIT(chan->id) << DMAC_CHAN_EN_SHIFT);
+ if (chan->chip->dw->hdata->reg_map_8_channels)
+ val |= BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
+ else
+ val |= BIT(chan->id) << DMAC_CHAN_EN2_WE_SHIFT;
+ axi_dma_iowrite32(chan->chip, DMAC_CHEN, (u32)val);
+ }
}
static inline void axi_chan_enable(struct axi_dma_chan *chan)
{
- u32 val;
-
- val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
- if (chan->chip->dw->hdata->reg_map_8_channels)
- val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
- BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
- else
- val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
+ u64 val;
+
+ if (chan->chip->dw->hdata->nr_channels >= DMAC_CHAN_16) {
+ val = axi_dma_ioread64(chan->chip, DMAC_CHEN);
+ if (chan->id >= DMAC_CHAN_16) {
+ val |= (BIT(chan->id) >> DMAC_CHAN_16)
+ << (DMAC_CHAN_EN_SHIFT + DMAC_CHAN_BLOCK_SHIFT) |
+ (BIT(chan->id) >> DMAC_CHAN_16)
+ << (DMAC_CHAN_EN2_WE_SHIFT + DMAC_CHAN_BLOCK_SHIFT);
+ } else {
+ val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
BIT(chan->id) << DMAC_CHAN_EN2_WE_SHIFT;
- axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
+ }
+ axi_dma_iowrite64(chan->chip, DMAC_CHEN, val);
+ } else {
+ val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+ if (chan->chip->dw->hdata->reg_map_8_channels) {
+ val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
+ BIT(chan->id) << DMAC_CHAN_EN_WE_SHIFT;
+ } else {
+ val |= BIT(chan->id) << DMAC_CHAN_EN_SHIFT |
+ BIT(chan->id) << DMAC_CHAN_EN2_WE_SHIFT;
+ }
+ axi_dma_iowrite32(chan->chip, DMAC_CHEN, (u32)val);
+ }
}
static inline bool axi_chan_is_hw_enable(struct axi_dma_chan *chan)
{
- u32 val;
+ u64 val;
- val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+ if (chan->chip->dw->hdata->nr_channels >= DMAC_CHAN_16)
+ val = axi_dma_ioread64(chan->chip, DMAC_CHEN);
+ else
+ val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
- return !!(val & (BIT(chan->id) << DMAC_CHAN_EN_SHIFT));
+ if (chan->id >= DMAC_CHAN_16)
+ return !!(val & ((BIT(chan->id) >> DMAC_CHAN_16) << DMAC_CHAN_BLOCK_SHIFT));
+ else
+ return !!(val & (BIT(chan->id) << DMAC_CHAN_EN_SHIFT));
}
static void axi_dma_hw_init(struct axi_dma_chip *chip)
@@ -1175,20 +1221,34 @@ static int dma_chan_pause(struct dma_chan *dchan)
struct axi_dma_chan *chan = dchan_to_axi_dma_chan(dchan);
unsigned long flags;
unsigned int timeout = 20; /* timeout iterations */
- u32 val;
+ u64 val;
spin_lock_irqsave(&chan->vc.lock, flags);
- if (chan->chip->dw->hdata->reg_map_8_channels) {
- val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
- val |= BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT |
- BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT;
- axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
+ if (chan->chip->dw->hdata->nr_channels >= DMAC_CHAN_16) {
+ val = axi_dma_ioread64(chan->chip, DMAC_CHSUSPREG);
+ if (chan->id >= DMAC_CHAN_16) {
+ val |= (BIT(chan->id) >> DMAC_CHAN_16)
+ << (DMAC_CHAN_SUSP2_SHIFT + DMAC_CHAN_BLOCK_SHIFT) |
+ (BIT(chan->id) >> DMAC_CHAN_16)
+ << (DMAC_CHAN_SUSP2_WE_SHIFT + DMAC_CHAN_BLOCK_SHIFT);
+ } else {
+ val |= BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT |
+ BIT(chan->id) << DMAC_CHAN_SUSP2_WE_SHIFT;
+ }
+ axi_dma_iowrite64(chan->chip, DMAC_CHSUSPREG, val);
} else {
- val = axi_dma_ioread32(chan->chip, DMAC_CHSUSPREG);
- val |= BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT |
+ if (chan->chip->dw->hdata->reg_map_8_channels) {
+ val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+ val |= BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT |
+ BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT;
+ axi_dma_iowrite32(chan->chip, DMAC_CHEN, (u32)val);
+ } else {
+ val = axi_dma_ioread32(chan->chip, DMAC_CHSUSPREG);
+ val |= BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT |
BIT(chan->id) << DMAC_CHAN_SUSP2_WE_SHIFT;
- axi_dma_iowrite32(chan->chip, DMAC_CHSUSPREG, val);
+ axi_dma_iowrite32(chan->chip, DMAC_CHSUSPREG, (u32)val);
+ }
}
do {
@@ -1210,18 +1270,32 @@ static int dma_chan_pause(struct dma_chan *dchan)
/* Called in chan locked context */
static inline void axi_chan_resume(struct axi_dma_chan *chan)
{
- u32 val;
-
- if (chan->chip->dw->hdata->reg_map_8_channels) {
- val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
- val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT);
- val |= (BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT);
- axi_dma_iowrite32(chan->chip, DMAC_CHEN, val);
+ u64 val;
+
+ if (chan->chip->dw->hdata->nr_channels >= DMAC_CHAN_16) {
+ val = axi_dma_ioread64(chan->chip, DMAC_CHSUSPREG);
+ if (chan->id >= DMAC_CHAN_16) {
+ val &= ~((BIT(chan->id) >> DMAC_CHAN_16)
+ << (DMAC_CHAN_SUSP2_SHIFT + DMAC_CHAN_BLOCK_SHIFT));
+ val |= ((BIT(chan->id) >> DMAC_CHAN_16)
+ << (DMAC_CHAN_SUSP2_WE_SHIFT + DMAC_CHAN_BLOCK_SHIFT));
+ } else {
+ val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT);
+ val |= (BIT(chan->id) << DMAC_CHAN_SUSP2_WE_SHIFT);
+ }
+ axi_dma_iowrite64(chan->chip, DMAC_CHSUSPREG, val);
} else {
- val = axi_dma_ioread32(chan->chip, DMAC_CHSUSPREG);
- val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT);
- val |= (BIT(chan->id) << DMAC_CHAN_SUSP2_WE_SHIFT);
- axi_dma_iowrite32(chan->chip, DMAC_CHSUSPREG, val);
+ if (chan->chip->dw->hdata->reg_map_8_channels) {
+ val = axi_dma_ioread32(chan->chip, DMAC_CHEN);
+ val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP_SHIFT);
+ val |= (BIT(chan->id) << DMAC_CHAN_SUSP_WE_SHIFT);
+ axi_dma_iowrite32(chan->chip, DMAC_CHEN, (u32)val);
+ } else {
+ val = axi_dma_ioread32(chan->chip, DMAC_CHSUSPREG);
+ val &= ~(BIT(chan->id) << DMAC_CHAN_SUSP2_SHIFT);
+ val |= (BIT(chan->id) << DMAC_CHAN_SUSP2_WE_SHIFT);
+ axi_dma_iowrite32(chan->chip, DMAC_CHSUSPREG, (u32)val);
+ }
}
chan->is_paused = false;
diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac.h b/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
index eb267cb24f67..454904d99654 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac.h
@@ -18,7 +18,7 @@
#include "../virt-dma.h"
-#define DMAC_MAX_CHANNELS 16
+#define DMAC_MAX_CHANNELS 32
#define DMAC_MAX_MASTERS 2
#define DMAC_MAX_BLK_SIZE 0x200000
@@ -222,6 +222,10 @@ static inline struct axi_dma_chan *dchan_to_axi_dma_chan(struct dma_chan *dchan)
/* DMAC_CHEN2 */
#define DMAC_CHAN_EN2_WE_SHIFT 16
+/* DMAC CHAN BLOCKS */
+#define DMAC_CHAN_BLOCK_SHIFT 32
+#define DMAC_CHAN_16 16
+
/* DMAC_CHSUSP */
#define DMAC_CHAN_SUSP2_SHIFT 0
#define DMAC_CHAN_SUSP2_WE_SHIFT 16
--
2.30.2
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