Message-Id: <20230324021420.73401-4-cai.huoqing@linux.dev>
Date:   Fri, 24 Mar 2023 10:14:17 +0800
From:   Cai Huoqing <cai.huoqing@...ux.dev>
To:     fancer.lancer@...il.com
Cc:     Cai Huoqing <cai.huoqing@...ux.dev>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Vinod Koul <vkoul@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: [PATCH v9 3/4] dmaengine: dw-edma: Add support for native HDMA

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.

HDMA write and read channels operate independently to maximize
the performance of the HDMA read and write data transfer over
the link When you configure the HDMA with multiple read channels,
then it uses a round robin (RR) arbitration scheme to select
the next read channel to be serviced.The same applies when you
have multiple write channels.

The native HDMA driver also supports a maximum of 16 independent
channels (8 write + 8 read), which can run simultaneously.
Both SAR (Source Address Register) and DAR (Destination Address Register)
are aligned to byte.

Signed-off-by: Cai Huoqing <cai.huoqing@...ux.dev>
Reviewed-by: Serge Semin <fancer.lancer@...il.com>
---
v8->v9:
  1.Drop an empty line.

v8 link:
  https://lore.kernel.org/lkml/20230323034944.78357-4-cai.huoqing@linux.dev/

 drivers/dma/dw-edma/Makefile          |   5 +-
 drivers/dma/dw-edma/dw-edma-core.c    |   6 +-
 drivers/dma/dw-edma/dw-hdma-v0-core.c | 294 ++++++++++++++++++++++++++
 drivers/dma/dw-edma/dw-hdma-v0-core.h |  17 ++
 drivers/dma/dw-edma/dw-hdma-v0-regs.h | 129 +++++++++++
 include/linux/dma/edma.h              |   3 +-
 6 files changed, 450 insertions(+), 4 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-regs.h

diff --git a/drivers/dma/dw-edma/Makefile b/drivers/dma/dw-edma/Makefile
index 8d45c0d5689d..b1c91ef2c63d 100644
--- a/drivers/dma/dw-edma/Makefile
+++ b/drivers/dma/dw-edma/Makefile
@@ -2,6 +2,7 @@
 
 obj-$(CONFIG_DW_EDMA)		+= dw-edma.o
 dw-edma-$(CONFIG_DEBUG_FS)	:= dw-edma-v0-debugfs.o
-dw-edma-objs			:= dw-edma-core.o \
-					dw-edma-v0-core.o $(dw-edma-y)
+dw-edma-objs			:= dw-edma-core.o	\
+				   dw-edma-v0-core.o	\
+				   dw-hdma-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 f916f0d84bd6..61a6719d9d4e 100644
--- a/drivers/dma/dw-edma/dw-edma-core.c
+++ b/drivers/dma/dw-edma/dw-edma-core.c
@@ -18,6 +18,7 @@
 
 #include "dw-edma-core.h"
 #include "dw-edma-v0-core.h"
+#include "dw-hdma-v0-core.h"
 #include "../dmaengine.h"
 #include "../virt-dma.h"
 
@@ -917,7 +918,10 @@ int dw_edma_probe(struct dw_edma_chip *chip)
 
 	dw->chip = chip;
 
-	dw_edma_v0_core_register(dw);
+	if (dw->chip->mf == EDMA_MF_HDMA_NATIVE)
+		dw_hdma_v0_core_register(dw);
+	else
+		dw_edma_v0_core_register(dw);
 
 	raw_spin_lock_init(&dw->lock);
 
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..22b7b0410deb
--- /dev/null
+++ b/drivers/dma/dw-edma/dw-hdma-v0-core.c
@@ -0,0 +1,294 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 Cai Huoqing
+ * Synopsys DesignWare HDMA v0 core
+ */
+
+#include <linux/bitfield.h>
+#include <linux/irqreturn.h>
+#include <linux/io-64-nonatomic-lo-hi.h>
+
+#include "dw-edma-core.h"
+#include "dw-hdma-v0-core.h"
+#include "dw-hdma-v0-regs.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)
+
+/* HDMA management callbacks */
+static 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);
+	}
+}
+
+static 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;
+}
+
+static 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;
+}
+
+static 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);
+}
+
+static 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);
+}
+
+static 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);
+}
+
+static irqreturn_t
+dw_hdma_v0_core_handle_int(struct dw_edma_irq *dw_irq, enum dw_edma_dir dir,
+			   dw_edma_handler_t done, dw_edma_handler_t abort)
+{
+	struct dw_edma *dw = dw_irq->dw;
+	unsigned long total, pos, val;
+	irqreturn_t ret = IRQ_NONE;
+	struct dw_edma_chan *chan;
+	unsigned long off, 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;
+	}
+
+	for_each_set_bit(pos, &mask, total) {
+		chan = &dw->chan[pos + off];
+
+		val = dw_hdma_v0_core_status_int(chan);
+		if (FIELD_GET(HDMA_V0_STOP_INT_MASK, val)) {
+			dw_hdma_v0_core_clear_done_int(chan);
+			done(chan);
+
+			ret = IRQ_HANDLED;
+		}
+
+		if (FIELD_GET(HDMA_V0_ABORT_INT_MASK, val)) {
+			dw_hdma_v0_core_clear_abort_int(chan);
+			abort(chan);
+
+			ret = IRQ_HANDLED;
+		}
+	}
+
+	return ret;
+}
+
+static void dw_hdma_v0_write_ll_data(struct dw_edma_chunk *chunk, int i,
+				     u32 control, u32 size, u64 sar, u64 dar)
+{
+	ptrdiff_t ofs = i * sizeof(struct dw_hdma_v0_lli);
+
+	if (chunk->chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL) {
+		struct dw_hdma_v0_lli *lli = chunk->ll_region.vaddr.mem + ofs;
+
+		lli->control = control;
+		lli->transfer_size = size;
+		lli->sar.reg = sar;
+		lli->dar.reg = dar;
+	} else {
+		struct dw_hdma_v0_lli __iomem *lli = chunk->ll_region.vaddr.io + ofs;
+
+		writel(control, &lli->control);
+		writel(size, &lli->transfer_size);
+		writeq(sar, &lli->sar.reg);
+		writeq(dar, &lli->dar.reg);
+	}
+}
+
+static void dw_hdma_v0_write_ll_link(struct dw_edma_chunk *chunk,
+				     int i, u32 control, u64 pointer)
+{
+	ptrdiff_t ofs = i * sizeof(struct dw_hdma_v0_lli);
+
+	if (chunk->chan->dw->chip->flags & DW_EDMA_CHIP_LOCAL) {
+		struct dw_hdma_v0_llp *llp = chunk->ll_region.vaddr.mem + ofs;
+
+		llp->control = control;
+		llp->llp.reg = pointer;
+	} else {
+		struct dw_hdma_v0_llp __iomem *llp = chunk->ll_region.vaddr.io + ofs;
+
+		writel(control, &llp->control);
+		writeq(pointer, &llp->llp.reg);
+	}
+}
+
+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;
+	u32 control = 0, i = 0;
+	int j;
+
+	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;
+		}
+
+		dw_hdma_v0_write_ll_data(chunk, i++, control, child->sz,
+					 child->sar, child->dar);
+	}
+
+	control = DW_HDMA_V0_LLP | DW_HDMA_V0_TCB;
+	if (!chunk->cb)
+		control |= DW_HDMA_V0_CB;
+
+	dw_hdma_v0_write_ll_link(chunk, i, control, chunk->ll_region.paddr);
+}
+
+static 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) |
+		      HDMA_V0_STOP_INT_MASK | HDMA_V0_ABORT_INT_MASK |
+		      HDMA_V0_LOCAL_STOP_INT_EN | 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));
+	}
+	/* Set consumer cycle */
+	SET_CH_32(dw, chan->dir, chan->id, cycle_sync,
+		  HDMA_V0_CONSUMER_CYCLE_STAT | HDMA_V0_CONSUMER_CYCLE_BIT);
+	/* Doorbell */
+	SET_CH_32(dw, chan->dir, chan->id, doorbell, HDMA_V0_DOORBELL_START);
+}
+
+static void dw_hdma_v0_core_ch_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);
+	/* config MSI data */
+	SET_CH_32(dw, chan->dir, chan->id, msi_msgdata, chan->msi.data);
+}
+
+/* HDMA debugfs callbacks */
+static void dw_hdma_v0_core_debugfs_on(struct dw_edma *dw)
+{
+}
+
+static const struct dw_edma_core_ops dw_hdma_v0_core = {
+	.off = dw_hdma_v0_core_off,
+	.ch_count = dw_hdma_v0_core_ch_count,
+	.ch_status = dw_hdma_v0_core_ch_status,
+	.handle_int = dw_hdma_v0_core_handle_int,
+	.start = dw_hdma_v0_core_start,
+	.ch_config = dw_hdma_v0_core_ch_config,
+	.debugfs_on = dw_hdma_v0_core_debugfs_on,
+};
+
+void dw_hdma_v0_core_register(struct dw_edma *dw)
+{
+	dw->core = &dw_hdma_v0_core;
+}
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..c373b4f0bd8a
--- /dev/null
+++ b/drivers/dma/dw-edma/dw-hdma-v0-core.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2023 Cai Huoqing
+ * Synopsys DesignWare HDMA v0 core
+ *
+ * Author: Cai Huoqing <cai.huoqing@...ux.dev>
+ */
+
+#ifndef _DW_HDMA_V0_CORE_H
+#define _DW_HDMA_V0_CORE_H
+
+#include <linux/dma/edma.h>
+
+/* HDMA core register */
+void dw_hdma_v0_core_register(struct dw_edma *dw);
+
+#endif /* _DW_HDMA_V0_CORE_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..a974abdf8aaf
--- /dev/null
+++ b/drivers/dma/dw-edma/dw-hdma-v0-regs.h
@@ -0,0 +1,129 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2023 Cai Huoqing
+ * Synopsys DesignWare HDMA v0 reg
+ *
+ * Author: Cai Huoqing <cai.huoqing@...ux.dev>
+ */
+
+#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_CONSUMER_CYCLE_STAT		BIT(1)
+#define HDMA_V0_CONSUMER_CYCLE_BIT		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 padding_1[16];			/* 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 */
+	u32 padding_2[21];			/* 0x00ac..0x00fc */
+} __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;
+
+struct dw_hdma_v0_lli {
+	u32 control;
+	u32 transfer_size;
+	union {
+		u64 reg;
+		struct {
+			u32 lsb;
+			u32 msb;
+		};
+	} sar;
+	union {
+		u64 reg;
+		struct {
+			u32 lsb;
+			u32 msb;
+		};
+	} dar;
+} __packed;
+
+struct dw_hdma_v0_llp {
+	u32 control;
+	u32 reserved;
+	union {
+		u64 reg;
+		struct {
+			u32 lsb;
+			u32 msb;
+		};
+	} llp;
+} __packed;
+
+#endif /* _DW_HDMA_V0_REGS_H */
diff --git a/include/linux/dma/edma.h b/include/linux/dma/edma.h
index ed401c965a87..3080747689f6 100644
--- a/include/linux/dma/edma.h
+++ b/include/linux/dma/edma.h
@@ -48,7 +48,8 @@ struct dw_edma_plat_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,
 };
 
 /**
-- 
2.34.1

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