Merge tag 'dmaengine-4.20-rc1' of git://git.infradead.org/users/vkoul/slave-dma

Pull dmaengine updates from Vinod Koul:

 - Support for ColdFire mcf5441x edma controller

 - Support for link list mode in sprd dma

 - More users of managed dmaenginem_async_device_register API

 - Cyclic mode support in owl dma driver

 - DT updates for renesas drivers, dma-jz4780 updates and support for
   JZ4770, JZ4740 and JZ4725B controllers

 - Removal of deprecated dma_slave_config direction in dmaengine
   drivers, few more users will be removed in next cycle and eventually
   removed.

 - Minor updates to idma64, ioat, pxa, ppc drivers

* tag 'dmaengine-4.20-rc1' of git://git.infradead.org/users/vkoul/slave-dma: (66 commits)
  dmaengine: ppc4xx: fix off-by-one build failure
  dmaengine: owl: Fix warnings generated during build
  dmaengine: fsl-edma: remove dma_slave_config direction usage
  dmaengine: rcar-dmac: set scatter/gather max segment size
  dmaengine: mmp_tdma: remove dma_slave_config direction usage
  dmaengine: ep93xx_dma: remove dma_slave_config direction usage
  dmaengine: k3dma: remove dma_slave_config direction usage
  dmaengine: k3dma: dont use direction for memcpy
  dmaengine: imx-dma: remove dma_slave_config direction usage
  dmaengine: idma: remove dma_slave_config direction usage
  dmaengine: hsu: remove dma_slave_config direction usage
  dmaengine: dw: remove dma_slave_config direction usage
  dmaengine: jz4740: remove dma_slave_config direction usage
  dmaengine: coh901318: remove dma_slave_config direction usage
  dmaengine: bcm2835: remove dma_slave_config direction usage
  dmaengine: at_hdmac: remove dma_slave_config direction usage
  dmaengine: owl: Add Slave and Cyclic mode support for Actions Semi Owl S900 SoC
  dmaengine: ioat: fix prototype of ioat_enumerate_channels
  dmaengine: stm32-dma: check whether length is aligned on FIFO threshold
  dt-bindings: dmaengine: usb-dmac: Add binding for r8a7744
  ...

Documentation/devicetree/bindings/dma/jz4780-dma.txt

@@ -2,8 +2,13 @@
 
 Required properties:
 
-- compatible: Should be "ingenic,jz4780-dma"
-- reg: Should contain the DMA controller registers location and length.
+- compatible: Should be one of:
+  * ingenic,jz4740-dma
+  * ingenic,jz4725b-dma
+  * ingenic,jz4770-dma
+  * ingenic,jz4780-dma
+- reg: Should contain the DMA channel registers location and length, followed
+  by the DMA controller registers location and length.
 - interrupts: Should contain the interrupt specifier of the DMA controller.
 - clocks: Should contain a clock specifier for the JZ4780 PDMA clock.
 - #dma-cells: Must be <2>. Number of integer cells in the dmas property of
@@ -19,9 +24,10 @@ Optional properties:
 
 Example:
 
-dma: dma@13420000 {
+dma: dma-controller@13420000 {
 	compatible = "ingenic,jz4780-dma";
-	reg = <0x13420000 0x10000>;
+	reg = <0x13420000 0x400
+	       0x13421000 0x40>;
 
 	interrupt-parent = <&intc>;
 	interrupts = <10>;

Documentation/devicetree/bindings/dma/renesas,rcar-dmac.txt

@@ -17,6 +17,7 @@ Required Properties:
 - compatible: "renesas,dmac-<soctype>", "renesas,rcar-dmac" as fallback.
 	      Examples with soctypes are:
 		- "renesas,dmac-r8a7743" (RZ/G1M)
+		- "renesas,dmac-r8a7744" (RZ/G1N)
 		- "renesas,dmac-r8a7745" (RZ/G1E)
 		- "renesas,dmac-r8a77470" (RZ/G1C)
 		- "renesas,dmac-r8a7790" (R-Car H2)

Documentation/devicetree/bindings/dma/renesas,usb-dmac.txt

@@ -4,6 +4,7 @@ Required Properties:
 -compatible: "renesas,<soctype>-usb-dmac", "renesas,usb-dmac" as fallback.
 	Examples with soctypes are:
 	  - "renesas,r8a7743-usb-dmac" (RZ/G1M)
+	  - "renesas,r8a7744-usb-dmac" (RZ/G1N)
 	  - "renesas,r8a7745-usb-dmac" (RZ/G1E)
 	  - "renesas,r8a7790-usb-dmac" (R-Car H2)
 	  - "renesas,r8a7791-usb-dmac" (R-Car M2-W)

arch/mips/boot/dts/ingenic/jz4740.dtsi

@@ -154,6 +154,21 @@ uart1: serial@10031000 {
 		clock-names = "baud", "module";
 	};
 
+	dmac: dma-controller@13020000 {
+		compatible = "ingenic,jz4740-dma";
+		reg = <0x13020000 0xbc
+		       0x13020300 0x14>;
+		#dma-cells = <2>;
+
+		interrupt-parent = <&intc>;
+		interrupts = <29>;
+
+		clocks = <&cgu JZ4740_CLK_DMA>;
+
+		/* Disable dmac until we have something that uses it */
+		status = "disabled";
+	};
+
 	uhc: uhc@13030000 {
 		compatible = "ingenic,jz4740-ohci", "generic-ohci";
 		reg = <0x13030000 0x1000>;

arch/mips/boot/dts/ingenic/jz4770.dtsi

@@ -196,6 +196,36 @@ uart3: serial@10033000 {
 		status = "disabled";
 	};
 
+	dmac0: dma-controller@13420000 {
+		compatible = "ingenic,jz4770-dma";
+		reg = <0x13420000 0xC0
+		       0x13420300 0x20>;
+
+		#dma-cells = <1>;
+
+		clocks = <&cgu JZ4770_CLK_DMA>;
+		interrupt-parent = <&intc>;
+		interrupts = <24>;
+
+		/* Disable dmac0 until we have something that uses it */
+		status = "disabled";
+	};
+
+	dmac1: dma-controller@13420100 {
+		compatible = "ingenic,jz4770-dma";
+		reg = <0x13420100 0xC0
+		       0x13420400 0x20>;
+
+		#dma-cells = <1>;
+
+		clocks = <&cgu JZ4770_CLK_DMA>;
+		interrupt-parent = <&intc>;
+		interrupts = <23>;
+
+		/* Disable dmac1 until we have something that uses it */
+		status = "disabled";
+	};
+
 	uhc: uhc@13430000 {
 		compatible = "generic-ohci";
 		reg = <0x13430000 0x1000>;

arch/mips/boot/dts/ingenic/jz4780.dtsi

@@ -266,7 +266,8 @@ nemc: nemc@13410000 {
 
 	dma: dma@13420000 {
 		compatible = "ingenic,jz4780-dma";
-		reg = <0x13420000 0x10000>;
+		reg = <0x13420000 0x400
+		       0x13421000 0x40>;
 		#dma-cells = <2>;
 
 		interrupt-parent = <&intc>;

drivers/dma/Kconfig

@@ -143,7 +143,7 @@ config DMA_JZ4740
 
 config DMA_JZ4780
 	tristate "JZ4780 DMA support"
-	depends on MACH_JZ4780 || COMPILE_TEST
+	depends on MIPS || COMPILE_TEST
 	select DMA_ENGINE
 	select DMA_VIRTUAL_CHANNELS
 	help
@@ -321,6 +321,17 @@ config LPC18XX_DMAMUX
 	  Enable support for DMA on NXP LPC18xx/43xx platforms
 	  with PL080 and multiplexed DMA request lines.
 
+config MCF_EDMA
+	tristate "Freescale eDMA engine support, ColdFire mcf5441x SoCs"
+	depends on M5441x || COMPILE_TEST
+	select DMA_ENGINE
+	select DMA_VIRTUAL_CHANNELS
+	help
+	  Support the Freescale ColdFire eDMA engine, 64-channel
+	  implementation that performs complex data transfers with
+	  minimal intervention from a host processor.
+	  This module can be found on Freescale ColdFire mcf5441x SoCs.
+
 config MMP_PDMA
 	bool "MMP PDMA support"
 	depends on ARCH_MMP || ARCH_PXA || COMPILE_TEST

drivers/dma/Makefile

@@ -31,7 +31,8 @@ obj-$(CONFIG_DW_AXI_DMAC) += dw-axi-dmac/
 obj-$(CONFIG_DW_DMAC_CORE) += dw/
 obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
 obj-$(CONFIG_FSL_DMA) += fsldma.o
-obj-$(CONFIG_FSL_EDMA) += fsl-edma.o
+obj-$(CONFIG_FSL_EDMA) += fsl-edma.o fsl-edma-common.o
+obj-$(CONFIG_MCF_EDMA) += mcf-edma.o fsl-edma-common.o
 obj-$(CONFIG_FSL_RAID) += fsl_raid.o
 obj-$(CONFIG_HSU_DMA) += hsu/
 obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o

drivers/dma/at_hdmac.c

@@ -1320,7 +1320,7 @@ atc_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
 	if (unlikely(!is_slave_direction(direction)))
 		goto err_out;
 
-	if (sconfig->direction == DMA_MEM_TO_DEV)
+	if (direction == DMA_MEM_TO_DEV)
 		reg_width = convert_buswidth(sconfig->dst_addr_width);
 	else
 		reg_width = convert_buswidth(sconfig->src_addr_width);

drivers/dma/at_xdmac.c

@@ -1600,7 +1600,7 @@ static void at_xdmac_tasklet(unsigned long data)
 		if (atchan->status & AT_XDMAC_CIS_ROIS)
 			dev_err(chan2dev(&atchan->chan), "request overflow error!!!");
 
-		spin_lock_bh(&atchan->lock);
+		spin_lock(&atchan->lock);
 		desc = list_first_entry(&atchan->xfers_list,
 					struct at_xdmac_desc,
 					xfer_node);
@@ -1610,7 +1610,7 @@ static void at_xdmac_tasklet(unsigned long data)
 		txd = &desc->tx_dma_desc;
 
 		at_xdmac_remove_xfer(atchan, desc);
-		spin_unlock_bh(&atchan->lock);
+		spin_unlock(&atchan->lock);
 
 		if (!at_xdmac_chan_is_cyclic(atchan)) {
 			dma_cookie_complete(txd);

drivers/dma/bcm2835-dma.c

@@ -778,14 +778,6 @@ static int bcm2835_dma_slave_config(struct dma_chan *chan,
 {
 	struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
 
-	if ((cfg->direction == DMA_DEV_TO_MEM &&
-	     cfg->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) ||
-	    (cfg->direction == DMA_MEM_TO_DEV &&
-	     cfg->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) ||
-	    !is_slave_direction(cfg->direction)) {
-		return -EINVAL;
-	}
-
 	c->cfg = *cfg;
 
 	return 0;

drivers/dma/coh901318.c

@@ -1306,6 +1306,7 @@ struct coh901318_chan {
 	unsigned long nbr_active_done;
 	unsigned long busy;
 
+	struct dma_slave_config config;
 	u32 addr;
 	u32 ctrl;
 
@@ -1402,6 +1403,10 @@ static inline struct coh901318_chan *to_coh901318_chan(struct dma_chan *chan)
 	return container_of(chan, struct coh901318_chan, chan);
 }
 
+static int coh901318_dma_set_runtimeconfig(struct dma_chan *chan,
+					   struct dma_slave_config *config,
+					   enum dma_transfer_direction direction);
+
 static inline const struct coh901318_params *
 cohc_chan_param(struct coh901318_chan *cohc)
 {
@@ -2360,6 +2365,8 @@ coh901318_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 	if (lli == NULL)
 		goto err_dma_alloc;
 
+	coh901318_dma_set_runtimeconfig(chan, &cohc->config, direction);
+
 	/* initiate allocated lli list */
 	ret = coh901318_lli_fill_sg(&cohc->base->pool, lli, sgl, sg_len,
 				    cohc->addr,
@@ -2499,7 +2506,8 @@ static const struct burst_table burst_sizes[] = {
 };
 
 static int coh901318_dma_set_runtimeconfig(struct dma_chan *chan,
-					   struct dma_slave_config *config)
+					   struct dma_slave_config *config,
+					   enum dma_transfer_direction direction)
 {
 	struct coh901318_chan *cohc = to_coh901318_chan(chan);
 	dma_addr_t addr;
@@ -2509,11 +2517,11 @@ static int coh901318_dma_set_runtimeconfig(struct dma_chan *chan,
 	int i = 0;
 
 	/* We only support mem to per or per to mem transfers */
-	if (config->direction == DMA_DEV_TO_MEM) {
+	if (direction == DMA_DEV_TO_MEM) {
 		addr = config->src_addr;
 		addr_width = config->src_addr_width;
 		maxburst = config->src_maxburst;
-	} else if (config->direction == DMA_MEM_TO_DEV) {
+	} else if (direction == DMA_MEM_TO_DEV) {
 		addr = config->dst_addr;
 		addr_width = config->dst_addr_width;
 		maxburst = config->dst_maxburst;
@@ -2579,6 +2587,16 @@ static int coh901318_dma_set_runtimeconfig(struct dma_chan *chan,
 	return 0;
 }
 
+static int coh901318_dma_slave_config(struct dma_chan *chan,
+					   struct dma_slave_config *config)
+{
+	struct coh901318_chan *cohc = to_coh901318_chan(chan);
+
+	memcpy(&cohc->config, config, sizeof(*config));
+
+	return 0;
+}
+
 static void coh901318_base_init(struct dma_device *dma, const int *pick_chans,
 				struct coh901318_base *base)
 {
@@ -2684,7 +2702,7 @@ static int __init coh901318_probe(struct platform_device *pdev)
 	base->dma_slave.device_prep_slave_sg = coh901318_prep_slave_sg;
 	base->dma_slave.device_tx_status = coh901318_tx_status;
 	base->dma_slave.device_issue_pending = coh901318_issue_pending;
-	base->dma_slave.device_config = coh901318_dma_set_runtimeconfig;
+	base->dma_slave.device_config = coh901318_dma_slave_config;
 	base->dma_slave.device_pause = coh901318_pause;
 	base->dma_slave.device_resume = coh901318_resume;
 	base->dma_slave.device_terminate_all = coh901318_terminate_all;
@@ -2707,7 +2725,7 @@ static int __init coh901318_probe(struct platform_device *pdev)
 	base->dma_memcpy.device_prep_dma_memcpy = coh901318_prep_memcpy;
 	base->dma_memcpy.device_tx_status = coh901318_tx_status;
 	base->dma_memcpy.device_issue_pending = coh901318_issue_pending;
-	base->dma_memcpy.device_config = coh901318_dma_set_runtimeconfig;
+	base->dma_memcpy.device_config = coh901318_dma_slave_config;
 	base->dma_memcpy.device_pause = coh901318_pause;
 	base->dma_memcpy.device_resume = coh901318_resume;
 	base->dma_memcpy.device_terminate_all = coh901318_terminate_all;

drivers/dma/dma-jz4740.c

@@ -113,6 +113,7 @@ struct jz4740_dma_desc {
 struct jz4740_dmaengine_chan {
 	struct virt_dma_chan vchan;
 	unsigned int id;
+	struct dma_slave_config config;
 
 	dma_addr_t fifo_addr;
 	unsigned int transfer_shift;
@@ -203,8 +204,9 @@ static enum jz4740_dma_transfer_size jz4740_dma_maxburst(u32 maxburst)
 	return JZ4740_DMA_TRANSFER_SIZE_32BYTE;
 }
 
-static int jz4740_dma_slave_config(struct dma_chan *c,
-				   struct dma_slave_config *config)
+static int jz4740_dma_slave_config_write(struct dma_chan *c,
+				   struct dma_slave_config *config,
+				   enum dma_transfer_direction direction)
 {
 	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
 	struct jz4740_dma_dev *dmadev = jz4740_dma_chan_get_dev(chan);
@@ -214,7 +216,7 @@ static int jz4740_dma_slave_config(struct dma_chan *c,
 	enum jz4740_dma_flags flags;
 	uint32_t cmd;
 
-	switch (config->direction) {
+	switch (direction) {
 	case DMA_MEM_TO_DEV:
 		flags = JZ4740_DMA_SRC_AUTOINC;
 		transfer_size = jz4740_dma_maxburst(config->dst_maxburst);
@@ -265,6 +267,15 @@ static int jz4740_dma_slave_config(struct dma_chan *c,
 	return 0;
 }
 
+static int jz4740_dma_slave_config(struct dma_chan *c,
+				   struct dma_slave_config *config)
+{
+	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
+
+	memcpy(&chan->config, config, sizeof(*config));
+	return 0;
+}
+
 static int jz4740_dma_terminate_all(struct dma_chan *c)
 {
 	struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
@@ -407,6 +418,8 @@ static struct dma_async_tx_descriptor *jz4740_dma_prep_slave_sg(
 	desc->direction = direction;
 	desc->cyclic = false;
 
+	jz4740_dma_slave_config_write(c, &chan->config, direction);
+
 	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
 }
 
@@ -438,6 +451,8 @@ static struct dma_async_tx_descriptor *jz4740_dma_prep_dma_cyclic(
 	desc->direction = direction;
 	desc->cyclic = true;
 
+	jz4740_dma_slave_config_write(c, &chan->config, direction);
+
 	return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
 }
 

drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c

@@ -934,7 +934,7 @@ static int dw_probe(struct platform_device *pdev)
 
 	pm_runtime_put(chip->dev);
 
-	ret = dma_async_device_register(&dw->dma);
+	ret = dmaenginem_async_device_register(&dw->dma);
 	if (ret)
 		goto err_pm_disable;
 
@@ -977,8 +977,6 @@ static int dw_remove(struct platform_device *pdev)
 		tasklet_kill(&chan->vc.task);
 	}
 
-	dma_async_device_unregister(&dw->dma);
-
 	return 0;
 }
 

drivers/dma/dw/core.c

@@ -886,12 +886,7 @@ static int dwc_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
 	 */
 	u32 s = dw->pdata->is_idma32 ? 1 : 2;
 
-	/* Check if chan will be configured for slave transfers */
-	if (!is_slave_direction(sconfig->direction))
-		return -EINVAL;
-
 	memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig));
-	dwc->direction = sconfig->direction;
 
 	sc->src_maxburst = sc->src_maxburst > 1 ? fls(sc->src_maxburst) - s : 0;
 	sc->dst_maxburst = sc->dst_maxburst > 1 ? fls(sc->dst_maxburst) - s : 0;

drivers/dma/dw/platform.c

@@ -284,6 +284,8 @@ MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id dw_dma_acpi_id_table[] = {
 	{ "INTL9C60", 0 },
+	{ "80862286", 0 },
+	{ "808622C0", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(acpi, dw_dma_acpi_id_table);

drivers/dma/ep93xx_dma.c

@@ -109,6 +109,9 @@
 #define DMA_MAX_CHAN_DESCRIPTORS	32
 
 struct ep93xx_dma_engine;
+static int ep93xx_dma_slave_config_write(struct dma_chan *chan,
+					 enum dma_transfer_direction dir,
+					 struct dma_slave_config *config);
 
 /**
  * struct ep93xx_dma_desc - EP93xx specific transaction descriptor
@@ -180,6 +183,7 @@ struct ep93xx_dma_chan {
 	struct list_head		free_list;
 	u32				runtime_addr;
 	u32				runtime_ctrl;
+	struct dma_slave_config		slave_config;
 };
 
 /**
@@ -1051,6 +1055,8 @@ ep93xx_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 		return NULL;
 	}
 
+	ep93xx_dma_slave_config_write(chan, dir, &edmac->slave_config);
+
 	first = NULL;
 	for_each_sg(sgl, sg, sg_len, i) {
 		size_t len = sg_dma_len(sg);
@@ -1136,6 +1142,8 @@ ep93xx_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
 		return NULL;
 	}
 
+	ep93xx_dma_slave_config_write(chan, dir, &edmac->slave_config);
+
 	/* Split the buffer into period size chunks */
 	first = NULL;
 	for (offset = 0; offset < buf_len; offset += period_len) {
@@ -1227,6 +1235,17 @@ static int ep93xx_dma_slave_config(struct dma_chan *chan,
 				   struct dma_slave_config *config)
 {
 	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+
+	memcpy(&edmac->slave_config, config, sizeof(*config));
+
+	return 0;
+}
+
+static int ep93xx_dma_slave_config_write(struct dma_chan *chan,
+					 enum dma_transfer_direction dir,
+					 struct dma_slave_config *config)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
 	enum dma_slave_buswidth width;
 	unsigned long flags;
 	u32 addr, ctrl;
@@ -1234,7 +1253,7 @@ static int ep93xx_dma_slave_config(struct dma_chan *chan,
 	if (!edmac->edma->m2m)
 		return -EINVAL;
 
-	switch (config->direction) {
+	switch (dir) {
 	case DMA_DEV_TO_MEM:
 		width = config->src_addr_width;
 		addr = config->src_addr;

drivers/dma/fsl-edma-common.h

+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2013-2014 Freescale Semiconductor, Inc.
+ * Copyright 2018 Angelo Dureghello <angelo@sysam.it>
+ */
+#ifndef _FSL_EDMA_COMMON_H_
+#define _FSL_EDMA_COMMON_H_
+
+#include "virt-dma.h"
+
+#define EDMA_CR_EDBG		BIT(1)
+#define EDMA_CR_ERCA		BIT(2)
+#define EDMA_CR_ERGA		BIT(3)
+#define EDMA_CR_HOE		BIT(4)
+#define EDMA_CR_HALT		BIT(5)
+#define EDMA_CR_CLM		BIT(6)
+#define EDMA_CR_EMLM		BIT(7)
+#define EDMA_CR_ECX		BIT(16)
+#define EDMA_CR_CX		BIT(17)
+
+#define EDMA_SEEI_SEEI(x)	((x) & GENMASK(4, 0))
+#define EDMA_CEEI_CEEI(x)	((x) & GENMASK(4, 0))
+#define EDMA_CINT_CINT(x)	((x) & GENMASK(4, 0))
+#define EDMA_CERR_CERR(x)	((x) & GENMASK(4, 0))
+
+#define EDMA_TCD_ATTR_DSIZE(x)		(((x) & GENMASK(2, 0)))
+#define EDMA_TCD_ATTR_DMOD(x)		(((x) & GENMASK(4, 0)) << 3)
+#define EDMA_TCD_ATTR_SSIZE(x)		(((x) & GENMASK(2, 0)) << 8)
+#define EDMA_TCD_ATTR_SMOD(x)		(((x) & GENMASK(4, 0)) << 11)
+#define EDMA_TCD_ATTR_DSIZE_8BIT	0
+#define EDMA_TCD_ATTR_DSIZE_16BIT	BIT(0)
+#define EDMA_TCD_ATTR_DSIZE_32BIT	BIT(1)
+#define EDMA_TCD_ATTR_DSIZE_64BIT	(BIT(0) | BIT(1))
+#define EDMA_TCD_ATTR_DSIZE_32BYTE	(BIT(3) | BIT(0))
+#define EDMA_TCD_ATTR_SSIZE_8BIT	0
+#define EDMA_TCD_ATTR_SSIZE_16BIT	(EDMA_TCD_ATTR_DSIZE_16BIT << 8)
+#define EDMA_TCD_ATTR_SSIZE_32BIT	(EDMA_TCD_ATTR_DSIZE_32BIT << 8)
+#define EDMA_TCD_ATTR_SSIZE_64BIT	(EDMA_TCD_ATTR_DSIZE_64BIT << 8)
+#define EDMA_TCD_ATTR_SSIZE_32BYTE	(EDMA_TCD_ATTR_DSIZE_32BYTE << 8)
+
+#define EDMA_TCD_CITER_CITER(x)		((x) & GENMASK(14, 0))
+#define EDMA_TCD_BITER_BITER(x)		((x) & GENMASK(14, 0))
+
+#define EDMA_TCD_CSR_START		BIT(0)
+#define EDMA_TCD_CSR_INT_MAJOR		BIT(1)
+#define EDMA_TCD_CSR_INT_HALF		BIT(2)
+#define EDMA_TCD_CSR_D_REQ		BIT(3)
+#define EDMA_TCD_CSR_E_SG		BIT(4)
+#define EDMA_TCD_CSR_E_LINK		BIT(5)
+#define EDMA_TCD_CSR_ACTIVE		BIT(6)
+#define EDMA_TCD_CSR_DONE		BIT(7)
+
+#define EDMAMUX_CHCFG_DIS		0x0
+#define EDMAMUX_CHCFG_ENBL		0x80
+#define EDMAMUX_CHCFG_SOURCE(n)		((n) & 0x3F)
+
+#define DMAMUX_NR	2
+
+#define FSL_EDMA_BUSWIDTHS	(BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
+				 BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
+enum fsl_edma_pm_state {
+	RUNNING = 0,
+	SUSPENDED,
+};
+
+struct fsl_edma_hw_tcd {
+	__le32	saddr;
+	__le16	soff;
+	__le16	attr;
+	__le32	nbytes;
+	__le32	slast;
+	__le32	daddr;
+	__le16	doff;
+	__le16	citer;
+	__le32	dlast_sga;
+	__le16	csr;
+	__le16	biter;
+};
+
+/*
+ * These are iomem pointers, for both v32 and v64.
+ */
+struct edma_regs {
+	void __iomem *cr;
+	void __iomem *es;
+	void __iomem *erqh;
+	void __iomem *erql;	/* aka erq on v32 */
+	void __iomem *eeih;
+	void __iomem *eeil;	/* aka eei on v32 */
+	void __iomem *seei;
+	void __iomem *ceei;
+	void __iomem *serq;
+	void __iomem *cerq;
+	void __iomem *cint;
+	void __iomem *cerr;
+	void __iomem *ssrt;
+	void __iomem *cdne;
+	void __iomem *inth;
+	void __iomem *intl;
+	void __iomem *errh;
+	void __iomem *errl;
+	struct fsl_edma_hw_tcd __iomem *tcd;
+};
+
+struct fsl_edma_sw_tcd {
+	dma_addr_t			ptcd;
+	struct fsl_edma_hw_tcd		*vtcd;
+};
+
+struct fsl_edma_chan {
+	struct virt_dma_chan		vchan;
+	enum dma_status			status;
+	enum fsl_edma_pm_state		pm_state;
+	bool				idle;
+	u32				slave_id;
+	struct fsl_edma_engine		*edma;
+	struct fsl_edma_desc		*edesc;
+	struct dma_slave_config		cfg;
+	u32				attr;
+	struct dma_pool			*tcd_pool;
+};
+
+struct fsl_edma_desc {
+	struct virt_dma_desc		vdesc;
+	struct fsl_edma_chan		*echan;
+	bool				iscyclic;
+	enum dma_transfer_direction	dirn;
+	unsigned int			n_tcds;
+	struct fsl_edma_sw_tcd		tcd[];
+};
+
+enum edma_version {
+	v1, /* 32ch, Vybdir, mpc57x, etc */
+	v2, /* 64ch Coldfire */
+};
+
+struct fsl_edma_engine {
+	struct dma_device	dma_dev;
+	void __iomem		*membase;
+	void __iomem		*muxbase[DMAMUX_NR];
+	struct clk		*muxclk[DMAMUX_NR];
+	struct mutex		fsl_edma_mutex;
+	u32			n_chans;
+	int			txirq;
+	int			errirq;
+	bool			big_endian;
+	enum edma_version	version;
+	struct edma_regs	regs;
+	struct fsl_edma_chan	chans[];
+};
+
+/*
+ * R/W functions for big- or little-endian registers:
+ * The eDMA controller's endian is independent of the CPU core's endian.
+ * For the big-endian IP module, the offset for 8-bit or 16-bit registers
+ * should also be swapped opposite to that in little-endian IP.
+ */
+static inline u32 edma_readl(struct fsl_edma_engine *edma, void __iomem *addr)
+{
+	if (edma->big_endian)
+		return ioread32be(addr);
+	else
+		return ioread32(addr);
+}
+
+static inline void edma_writeb(struct fsl_edma_engine *edma,
+			       u8 val, void __iomem *addr)
+{
+	/* swap the reg offset for these in big-endian mode */
+	if (edma->big_endian)
+		iowrite8(val, (void __iomem *)((unsigned long)addr ^ 0x3));
+	else
+		iowrite8(val, addr);
+}
+
+static inline void edma_writew(struct fsl_edma_engine *edma,
+			       u16 val, void __iomem *addr)
+{
+	/* swap the reg offset for these in big-endian mode */
+	if (edma->big_endian)
+		iowrite16be(val, (void __iomem *)((unsigned long)addr ^ 0x2));
+	else
+		iowrite16(val, addr);
+}
+
+static inline void edma_writel(struct fsl_edma_engine *edma,
+			       u32 val, void __iomem *addr)
+{
+	if (edma->big_endian)
+		iowrite32be(val, addr);
+	else
+		iowrite32(val, addr);
+}
+
+static inline struct fsl_edma_chan *to_fsl_edma_chan(struct dma_chan *chan)
+{
+	return container_of(chan, struct fsl_edma_chan, vchan.chan);
+}
+
+static inline struct fsl_edma_desc *to_fsl_edma_desc(struct virt_dma_desc *vd)
+{
+	return container_of(vd, struct fsl_edma_desc, vdesc);
+}
+
+void fsl_edma_disable_request(struct fsl_edma_chan *fsl_chan);
+void fsl_edma_chan_mux(struct fsl_edma_chan *fsl_chan,
+			unsigned int slot, bool enable);
+void fsl_edma_free_desc(struct virt_dma_desc *vdesc);
+int fsl_edma_terminate_all(struct dma_chan *chan);
+int fsl_edma_pause(struct dma_chan *chan);
+int fsl_edma_resume(struct dma_chan *chan);
+int fsl_edma_slave_config(struct dma_chan *chan,
+				 struct dma_slave_config *cfg);
+enum dma_status fsl_edma_tx_status(struct dma_chan *chan,
+		dma_cookie_t cookie, struct dma_tx_state *txstate);
+struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic(
+		struct dma_chan *chan, dma_addr_t dma_addr, size_t buf_len,
+		size_t period_len, enum dma_transfer_direction direction,
+		unsigned long flags);
+struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg(
+		struct dma_chan *chan, struct scatterlist *sgl,
+		unsigned int sg_len, enum dma_transfer_direction direction,
+		unsigned long flags, void *context);
+void fsl_edma_xfer_desc(struct fsl_edma_chan *fsl_chan);
+void fsl_edma_issue_pending(struct dma_chan *chan);
+int fsl_edma_alloc_chan_resources(struct dma_chan *chan);
+void fsl_edma_free_chan_resources(struct dma_chan *chan);
+void fsl_edma_cleanup_vchan(struct dma_device *dmadev);
+void fsl_edma_setup_regs(struct fsl_edma_engine *edma);
+
+#endif /* _FSL_EDMA_COMMON_H_ */

drivers/dma/fsldma.c

@@ -987,7 +987,7 @@ static void dma_do_tasklet(unsigned long data)
 
 	chan_dbg(chan, "tasklet entry\n");
 
-	spin_lock_bh(&chan->desc_lock);
+	spin_lock(&chan->desc_lock);
 
 	/* the hardware is now idle and ready for more */
 	chan->idle = true;
@@ -995,7 +995,7 @@ static void dma_do_tasklet(unsigned long data)
 	/* Run all cleanup for descriptors which have been completed */
 	fsldma_cleanup_descriptors(chan);
 
-	spin_unlock_bh(&chan->desc_lock);
+	spin_unlock(&chan->desc_lock);
 
 	chan_dbg(chan, "tasklet exit\n");
 }

drivers/dma/hsu/hsu.c

@@ -348,10 +348,6 @@ static int hsu_dma_slave_config(struct dma_chan *chan,
 {
 	struct hsu_dma_chan *hsuc = to_hsu_dma_chan(chan);
 
-	/* Check if chan will be configured for slave transfers */
-	if (!is_slave_direction(config->direction))
-		return -EINVAL;
-
 	memcpy(&hsuc->config, config, sizeof(hsuc->config));
 
 	return 0;

drivers/dma/idma64.c

@@ -142,9 +142,8 @@ static void idma64_chan_irq(struct idma64 *idma64, unsigned short c,
 {
 	struct idma64_chan *idma64c = &idma64->chan[c];
 	struct idma64_desc *desc;
-	unsigned long flags;
 
-	spin_lock_irqsave(&idma64c->vchan.lock, flags);
+	spin_lock(&idma64c->vchan.lock);
 	desc = idma64c->desc;
 	if (desc) {
 		if (status_err & (1 << c)) {
@@ -161,7 +160,7 @@ static void idma64_chan_irq(struct idma64 *idma64, unsigned short c,
 		if (idma64c->desc == NULL || desc->status == DMA_ERROR)
 			idma64_stop_transfer(idma64c);
 	}
-	spin_unlock_irqrestore(&idma64c->vchan.lock, flags);
+	spin_unlock(&idma64c->vchan.lock);
 }
 
 static irqreturn_t idma64_irq(int irq, void *dev)
@@ -408,10 +407,6 @@ static int idma64_slave_config(struct dma_chan *chan,
 {
 	struct idma64_chan *idma64c = to_idma64_chan(chan);
 
-	/* Check if chan will be configured for slave transfers */
-	if (!is_slave_direction(config->direction))
-		return -EINVAL;
-
 	memcpy(&idma64c->config, config, sizeof(idma64c->config));
 
 	convert_burst(&idma64c->config.src_maxburst);

drivers/dma/imx-dma.c

@@ -162,6 +162,7 @@ struct imxdma_channel {
 	bool				enabled_2d;
 	int				slot_2d;
 	unsigned int			irq;
+	struct dma_slave_config		config;
 };
 
 enum imx_dma_type {
@@ -675,14 +676,15 @@ static int imxdma_terminate_all(struct dma_chan *chan)
 	return 0;
 }
 
-static int imxdma_config(struct dma_chan *chan,
-			 struct dma_slave_config *dmaengine_cfg)
+static int imxdma_config_write(struct dma_chan *chan,
+			       struct dma_slave_config *dmaengine_cfg,
+			       enum dma_transfer_direction direction)
 {
 	struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
 	struct imxdma_engine *imxdma = imxdmac->imxdma;
 	unsigned int mode = 0;
 
-	if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
+	if (direction == DMA_DEV_TO_MEM) {
 		imxdmac->per_address = dmaengine_cfg->src_addr;
 		imxdmac->watermark_level = dmaengine_cfg->src_maxburst;
 		imxdmac->word_size = dmaengine_cfg->src_addr_width;
@@ -723,6 +725,16 @@ static int imxdma_config(struct dma_chan *chan,
 	return 0;
 }
 
+static int imxdma_config(struct dma_chan *chan,
+			 struct dma_slave_config *dmaengine_cfg)
+{
+	struct imxdma_channel *imxdmac = to_imxdma_chan(chan);
+
+	memcpy(&imxdmac->config, dmaengine_cfg, sizeof(*dmaengine_cfg));
+
+	return 0;
+}
+
 static enum dma_status imxdma_tx_status(struct dma_chan *chan,
 					    dma_cookie_t cookie,
 					    struct dma_tx_state *txstate)
@@ -905,6 +917,8 @@ static struct dma_async_tx_descriptor *imxdma_prep_dma_cyclic(
 	desc->desc.callback = NULL;
 	desc->desc.callback_param = NULL;
 
+	imxdma_config_write(chan, &imxdmac->config, direction);
+
 	return &desc->desc;
 }
 

drivers/dma/ioat/init.c

@@ -129,7 +129,7 @@ static void
 ioat_init_channel(struct ioatdma_device *ioat_dma,
 		  struct ioatdma_chan *ioat_chan, int idx);
 static void ioat_intr_quirk(struct ioatdma_device *ioat_dma);
-static int ioat_enumerate_channels(struct ioatdma_device *ioat_dma);
+static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma);
 static int ioat3_dma_self_test(struct ioatdma_device *ioat_dma);
 
 static int ioat_dca_enabled = 1;
@@ -575,7 +575,7 @@ static void ioat_dma_remove(struct ioatdma_device *ioat_dma)
  * ioat_enumerate_channels - find and initialize the device's channels
  * @ioat_dma: the ioat dma device to be enumerated
  */
-static int ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
+static void ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
 {
 	struct ioatdma_chan *ioat_chan;
 	struct device *dev = &ioat_dma->pdev->dev;
@@ -594,7 +594,7 @@ static int ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
 	xfercap_log = readb(ioat_dma->reg_base + IOAT_XFERCAP_OFFSET);
 	xfercap_log &= 0x1f; /* bits [4:0] valid */
 	if (xfercap_log == 0)
-		return 0;
+		return;
 	dev_dbg(dev, "%s: xfercap = %d\n", __func__, 1 << xfercap_log);
 
 	for (i = 0; i < dma->chancnt; i++) {
@@ -611,7 +611,6 @@ static int ioat_enumerate_channels(struct ioatdma_device *ioat_dma)
 		}
 	}
 	dma->chancnt = i;
-	return i;
 }
 
 /**
@@ -1205,8 +1204,15 @@ static void ioat_shutdown(struct pci_dev *pdev)
 
 		spin_lock_bh(&ioat_chan->prep_lock);
 		set_bit(IOAT_CHAN_DOWN, &ioat_chan->state);
-		del_timer_sync(&ioat_chan->timer);
 		spin_unlock_bh(&ioat_chan->prep_lock);
+		/*
+		 * Synchronization rule for del_timer_sync():
+		 *  - The caller must not hold locks which would prevent
+		 *    completion of the timer's handler.
+		 * So prep_lock cannot be held before calling it.
+		 */
+		del_timer_sync(&ioat_chan->timer);
+
 		/* this should quiesce then reset */
 		ioat_reset_hw(ioat_chan);
 	}

drivers/dma/k3dma.c

@@ -87,10 +87,10 @@ struct k3_dma_chan {
 	struct virt_dma_chan	vc;
 	struct k3_dma_phy	*phy;
 	struct list_head	node;
-	enum dma_transfer_direction dir;
 	dma_addr_t		dev_addr;
 	enum dma_status		status;
 	bool			cyclic;
+	struct dma_slave_config	slave_config;
 };
 
 struct k3_dma_phy {
@@ -118,6 +118,10 @@ struct k3_dma_dev {
 
 #define to_k3_dma(dmadev) container_of(dmadev, struct k3_dma_dev, slave)
 
+static int k3_dma_config_write(struct dma_chan *chan,
+			       enum dma_transfer_direction dir,
+			       struct dma_slave_config *cfg);
+
 static struct k3_dma_chan *to_k3_chan(struct dma_chan *chan)
 {
 	return container_of(chan, struct k3_dma_chan, vc.chan);
@@ -501,14 +505,8 @@ static struct dma_async_tx_descriptor *k3_dma_prep_memcpy(
 		copy = min_t(size_t, len, DMA_MAX_SIZE);
 		k3_dma_fill_desc(ds, dst, src, copy, num++, c->ccfg);
 
-		if (c->dir == DMA_MEM_TO_DEV) {
-			src += copy;
-		} else if (c->dir == DMA_DEV_TO_MEM) {
-			dst += copy;
-		} else {
-			src += copy;
-			dst += copy;
-		}
+		src += copy;
+		dst += copy;
 		len -= copy;
 	} while (len);
 
@@ -542,6 +540,7 @@ static struct dma_async_tx_descriptor *k3_dma_prep_slave_sg(
 	if (!ds)
 		return NULL;
 	num = 0;
+	k3_dma_config_write(chan, dir, &c->slave_config);
 
 	for_each_sg(sgl, sg, sglen, i) {
 		addr = sg_dma_address(sg);
@@ -602,6 +601,7 @@ k3_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t buf_addr,
 	avail = buf_len;
 	total = avail;
 	num = 0;
+	k3_dma_config_write(chan, dir, &c->slave_config);
 
 	if (period_len < modulo)
 		modulo = period_len;
@@ -642,18 +642,26 @@ static int k3_dma_config(struct dma_chan *chan,
 			 struct dma_slave_config *cfg)
 {
 	struct k3_dma_chan *c = to_k3_chan(chan);
+
+	memcpy(&c->slave_config, cfg, sizeof(*cfg));
+
+	return 0;
+}
+
+static int k3_dma_config_write(struct dma_chan *chan,
+			       enum dma_transfer_direction dir,
+			       struct dma_slave_config *cfg)
+{
+	struct k3_dma_chan *c = to_k3_chan(chan);
 	u32 maxburst = 0, val = 0;
 	enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
 
-	if (cfg == NULL)
-		return -EINVAL;
-	c->dir = cfg->direction;
-	if (c->dir == DMA_DEV_TO_MEM) {
+	if (dir == DMA_DEV_TO_MEM) {
 		c->ccfg = CX_CFG_DSTINCR;
 		c->dev_addr = cfg->src_addr;
 		maxburst = cfg->src_maxburst;
 		width = cfg->src_addr_width;
-	} else if (c->dir == DMA_MEM_TO_DEV) {
+	} else if (dir == DMA_MEM_TO_DEV) {
 		c->ccfg = CX_CFG_SRCINCR;
 		c->dev_addr = cfg->dst_addr;
 		maxburst = cfg->dst_maxburst;

drivers/dma/mcf-edma.c

+// SPDX-License-Identifier: GPL-2.0+
+//
+// Copyright (c) 2013-2014 Freescale Semiconductor, Inc
+// Copyright (c) 2017 Sysam, Angelo Dureghello  <angelo@sysam.it>
+
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/dma-mcf-edma.h>
+
+#include "fsl-edma-common.h"
+
+#define EDMA_CHANNELS		64
+#define EDMA_MASK_CH(x)		((x) & GENMASK(5, 0))
+
+static irqreturn_t mcf_edma_tx_handler(int irq, void *dev_id)
+{
+	struct fsl_edma_engine *mcf_edma = dev_id;
+	struct edma_regs *regs = &mcf_edma->regs;
+	unsigned int ch;
+	struct fsl_edma_chan *mcf_chan;
+	u64 intmap;
+
+	intmap = ioread32(regs->inth);
+	intmap <<= 32;
+	intmap |= ioread32(regs->intl);
+	if (!intmap)
+		return IRQ_NONE;
+
+	for (ch = 0; ch < mcf_edma->n_chans; ch++) {
+		if (intmap & BIT(ch)) {
+			iowrite8(EDMA_MASK_CH(ch), regs->cint);
+
+			mcf_chan = &mcf_edma->chans[ch];
+
+			spin_lock(&mcf_chan->vchan.lock);
+			if (!mcf_chan->edesc->iscyclic) {
+				list_del(&mcf_chan->edesc->vdesc.node);
+				vchan_cookie_complete(&mcf_chan->edesc->vdesc);
+				mcf_chan->edesc = NULL;
+				mcf_chan->status = DMA_COMPLETE;
+				mcf_chan->idle = true;
+			} else {
+				vchan_cyclic_callback(&mcf_chan->edesc->vdesc);
+			}
+
+			if (!mcf_chan->edesc)
+				fsl_edma_xfer_desc(mcf_chan);
+
+			spin_unlock(&mcf_chan->vchan.lock);
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t mcf_edma_err_handler(int irq, void *dev_id)
+{
+	struct fsl_edma_engine *mcf_edma = dev_id;
+	struct edma_regs *regs = &mcf_edma->regs;
+	unsigned int err, ch;
+
+	err = ioread32(regs->errl);
+	if (!err)
+		return IRQ_NONE;
+
+	for (ch = 0; ch < (EDMA_CHANNELS / 2); ch++) {
+		if (err & BIT(ch)) {
+			fsl_edma_disable_request(&mcf_edma->chans[ch]);
+			iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
+			mcf_edma->chans[ch].status = DMA_ERROR;
+			mcf_edma->chans[ch].idle = true;
+		}
+	}
+
+	err = ioread32(regs->errh);
+	if (!err)
+		return IRQ_NONE;
+
+	for (ch = (EDMA_CHANNELS / 2); ch < EDMA_CHANNELS; ch++) {
+		if (err & (BIT(ch - (EDMA_CHANNELS / 2)))) {
+			fsl_edma_disable_request(&mcf_edma->chans[ch]);
+			iowrite8(EDMA_CERR_CERR(ch), regs->cerr);
+			mcf_edma->chans[ch].status = DMA_ERROR;
+			mcf_edma->chans[ch].idle = true;
+		}
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int mcf_edma_irq_init(struct platform_device *pdev,
+				struct fsl_edma_engine *mcf_edma)
+{
+	int ret = 0, i;
+	struct resource *res;
+
+	res = platform_get_resource_byname(pdev,
+				IORESOURCE_IRQ, "edma-tx-00-15");
+	if (!res)
+		return -1;
+
+	for (ret = 0, i = res->start; i <= res->end; ++i)
+		ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
+	if (ret)
+		return ret;
+
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IRQ, "edma-tx-16-55");
+	if (!res)
+		return -1;
+
+	for (ret = 0, i = res->start; i <= res->end; ++i)
+		ret |= request_irq(i, mcf_edma_tx_handler, 0, "eDMA", mcf_edma);
+	if (ret)
+		return ret;
+
+	ret = platform_get_irq_byname(pdev, "edma-tx-56-63");
+	if (ret != -ENXIO) {
+		ret = request_irq(ret, mcf_edma_tx_handler,
+				  0, "eDMA", mcf_edma);
+		if (ret)
+			return ret;
+	}
+
+	ret = platform_get_irq_byname(pdev, "edma-err");
+	if (ret != -ENXIO) {
+		ret = request_irq(ret, mcf_edma_err_handler,
+				  0, "eDMA", mcf_edma);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static void mcf_edma_irq_free(struct platform_device *pdev,
+				struct fsl_edma_engine *mcf_edma)
+{
+	int irq;
+	struct resource *res;
+
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IRQ, "edma-tx-00-15");
+	if (res) {
+		for (irq = res->start; irq <= res->end; irq++)
+			free_irq(irq, mcf_edma);
+	}
+
+	res = platform_get_resource_byname(pdev,
+			IORESOURCE_IRQ, "edma-tx-16-55");
+	if (res) {
+		for (irq = res->start; irq <= res->end; irq++)
+			free_irq(irq, mcf_edma);
+	}
+
+	irq = platform_get_irq_byname(pdev, "edma-tx-56-63");
+	if (irq != -ENXIO)
+		free_irq(irq, mcf_edma);
+
+	irq = platform_get_irq_byname(pdev, "edma-err");
+	if (irq != -ENXIO)
+		free_irq(irq, mcf_edma);
+}
+
+static int mcf_edma_probe(struct platform_device *pdev)
+{
+	struct mcf_edma_platform_data *pdata;
+	struct fsl_edma_engine *mcf_edma;
+	struct fsl_edma_chan *mcf_chan;
+	struct edma_regs *regs;
+	struct resource *res;
+	int ret, i, len, chans;
+
+	pdata = dev_get_platdata(&pdev->dev);
+	if (!pdata) {
+		dev_err(&pdev->dev, "no platform data supplied\n");
+		return -EINVAL;
+	}
+
+	chans = pdata->dma_channels;
+	len = sizeof(*mcf_edma) + sizeof(*mcf_chan) * chans;
+	mcf_edma = devm_kzalloc(&pdev->dev, len, GFP_KERNEL);
+	if (!mcf_edma)
+		return -ENOMEM;
+
+	mcf_edma->n_chans = chans;
+
+	/* Set up version for ColdFire edma */
+	mcf_edma->version = v2;
+	mcf_edma->big_endian = 1;
+
+	if (!mcf_edma->n_chans) {
+		dev_info(&pdev->dev, "setting default channel number to 64");
+		mcf_edma->n_chans = 64;
+	}
+
+	mutex_init(&mcf_edma->fsl_edma_mutex);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+	mcf_edma->membase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mcf_edma->membase))
+		return PTR_ERR(mcf_edma->membase);
+
+	fsl_edma_setup_regs(mcf_edma);
+	regs = &mcf_edma->regs;
+
+	INIT_LIST_HEAD(&mcf_edma->dma_dev.channels);
+	for (i = 0; i < mcf_edma->n_chans; i++) {
+		struct fsl_edma_chan *mcf_chan = &mcf_edma->chans[i];
+
+		mcf_chan->edma = mcf_edma;
+		mcf_chan->slave_id = i;
+		mcf_chan->idle = true;
+		mcf_chan->vchan.desc_free = fsl_edma_free_desc;
+		vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev);
+		iowrite32(0x0, &regs->tcd[i].csr);
+	}
+
+	iowrite32(~0, regs->inth);
+	iowrite32(~0, regs->intl);
+
+	ret = mcf_edma_irq_init(pdev, mcf_edma);
+	if (ret)
+		return ret;
+
+	dma_cap_set(DMA_PRIVATE, mcf_edma->dma_dev.cap_mask);
+	dma_cap_set(DMA_SLAVE, mcf_edma->dma_dev.cap_mask);
+	dma_cap_set(DMA_CYCLIC, mcf_edma->dma_dev.cap_mask);
+
+	mcf_edma->dma_dev.dev = &pdev->dev;
+	mcf_edma->dma_dev.device_alloc_chan_resources =
+			fsl_edma_alloc_chan_resources;
+	mcf_edma->dma_dev.device_free_chan_resources =
+			fsl_edma_free_chan_resources;
+	mcf_edma->dma_dev.device_config = fsl_edma_slave_config;
+	mcf_edma->dma_dev.device_prep_dma_cyclic =
+			fsl_edma_prep_dma_cyclic;
+	mcf_edma->dma_dev.device_prep_slave_sg = fsl_edma_prep_slave_sg;
+	mcf_edma->dma_dev.device_tx_status = fsl_edma_tx_status;
+	mcf_edma->dma_dev.device_pause = fsl_edma_pause;
+	mcf_edma->dma_dev.device_resume = fsl_edma_resume;
+	mcf_edma->dma_dev.device_terminate_all = fsl_edma_terminate_all;
+	mcf_edma->dma_dev.device_issue_pending = fsl_edma_issue_pending;
+
+	mcf_edma->dma_dev.src_addr_widths = FSL_EDMA_BUSWIDTHS;
+	mcf_edma->dma_dev.dst_addr_widths = FSL_EDMA_BUSWIDTHS;
+	mcf_edma->dma_dev.directions =
+			BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+
+	mcf_edma->dma_dev.filter.fn = mcf_edma_filter_fn;
+	mcf_edma->dma_dev.filter.map = pdata->slave_map;
+	mcf_edma->dma_dev.filter.mapcnt = pdata->slavecnt;
+
+	platform_set_drvdata(pdev, mcf_edma);
+
+	ret = dma_async_device_register(&mcf_edma->dma_dev);
+	if (ret) {
+		dev_err(&pdev->dev,
+			"Can't register Freescale eDMA engine. (%d)\n", ret);
+		return ret;
+	}
+
+	/* Enable round robin arbitration */
+	iowrite32(EDMA_CR_ERGA | EDMA_CR_ERCA, regs->cr);
+
+	return 0;
+}
+
+static int mcf_edma_remove(struct platform_device *pdev)
+{
+	struct fsl_edma_engine *mcf_edma = platform_get_drvdata(pdev);
+
+	mcf_edma_irq_free(pdev, mcf_edma);
+	fsl_edma_cleanup_vchan(&mcf_edma->dma_dev);
+	dma_async_device_unregister(&mcf_edma->dma_dev);
+
+	return 0;
+}
+
+static struct platform_driver mcf_edma_driver = {
+	.driver		= {
+		.name	= "mcf-edma",
+	},
+	.probe		= mcf_edma_probe,
+	.remove		= mcf_edma_remove,
+};
+
+bool mcf_edma_filter_fn(struct dma_chan *chan, void *param)
+{
+	if (chan->device->dev->driver == &mcf_edma_driver.driver) {
+		struct fsl_edma_chan *mcf_chan = to_fsl_edma_chan(chan);
+
+		return (mcf_chan->slave_id == (uintptr_t)param);
+	}
+
+	return false;
+}
+EXPORT_SYMBOL(mcf_edma_filter_fn);
+
+static int __init mcf_edma_init(void)
+{
+	return platform_driver_register(&mcf_edma_driver);
+}
+subsys_initcall(mcf_edma_init);
+
+static void __exit mcf_edma_exit(void)
+{
+	platform_driver_unregister(&mcf_edma_driver);
+}
+module_exit(mcf_edma_exit);
+
+MODULE_ALIAS("platform:mcf-edma");
+MODULE_DESCRIPTION("Freescale eDMA engine driver, ColdFire family");
+MODULE_LICENSE("GPL v2");

drivers/dma/mmp_tdma.c

@@ -116,6 +116,7 @@ struct mmp_tdma_chan {
 	u32				burst_sz;
 	enum dma_slave_buswidth		buswidth;
 	enum dma_status			status;
+	struct dma_slave_config		slave_config;
 
 	int				idx;
 	enum mmp_tdma_type		type;
@@ -139,6 +140,10 @@ struct mmp_tdma_device {
 
 #define to_mmp_tdma_chan(dchan) container_of(dchan, struct mmp_tdma_chan, chan)
 
+static int mmp_tdma_config_write(struct dma_chan *chan,
+				 enum dma_transfer_direction dir,
+				 struct dma_slave_config *dmaengine_cfg);
+
 static void mmp_tdma_chan_set_desc(struct mmp_tdma_chan *tdmac, dma_addr_t phys)
 {
 	writel(phys, tdmac->reg_base + TDNDPR);
@@ -442,6 +447,8 @@ static struct dma_async_tx_descriptor *mmp_tdma_prep_dma_cyclic(
 	if (!desc)
 		goto err_out;
 
+	mmp_tdma_config_write(chan, direction, &tdmac->slave_config);
+
 	while (buf < buf_len) {
 		desc = &tdmac->desc_arr[i];
 
@@ -495,7 +502,18 @@ static int mmp_tdma_config(struct dma_chan *chan,
 {
 	struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
 
-	if (dmaengine_cfg->direction == DMA_DEV_TO_MEM) {
+	memcpy(&tdmac->slave_config, dmaengine_cfg, sizeof(*dmaengine_cfg));
+
+	return 0;
+}
+
+static int mmp_tdma_config_write(struct dma_chan *chan,
+				 enum dma_transfer_direction dir,
+				 struct dma_slave_config *dmaengine_cfg)
+{
+	struct mmp_tdma_chan *tdmac = to_mmp_tdma_chan(chan);
+
+	if (dir == DMA_DEV_TO_MEM) {
 		tdmac->dev_addr = dmaengine_cfg->src_addr;
 		tdmac->burst_sz = dmaengine_cfg->src_maxburst;
 		tdmac->buswidth = dmaengine_cfg->src_addr_width;
@@ -504,7 +522,7 @@ static int mmp_tdma_config(struct dma_chan *chan,
 		tdmac->burst_sz = dmaengine_cfg->dst_maxburst;
 		tdmac->buswidth = dmaengine_cfg->dst_addr_width;
 	}
-	tdmac->dir = dmaengine_cfg->direction;
+	tdmac->dir = dir;
 
 	return mmp_tdma_config_chan(chan);
 }
@@ -530,9 +548,6 @@ static void mmp_tdma_issue_pending(struct dma_chan *chan)
 
 static int mmp_tdma_remove(struct platform_device *pdev)
 {
-	struct mmp_tdma_device *tdev = platform_get_drvdata(pdev);
-
-	dma_async_device_unregister(&tdev->device);
 	return 0;
 }
 
@@ -696,7 +711,7 @@ static int mmp_tdma_probe(struct platform_device *pdev)
 	dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
 	platform_set_drvdata(pdev, tdev);
 
-	ret = dma_async_device_register(&tdev->device);
+	ret = dmaenginem_async_device_register(&tdev->device);
 	if (ret) {
 		dev_err(tdev->device.dev, "unable to register\n");
 		return ret;
@@ -708,7 +723,7 @@ static int mmp_tdma_probe(struct platform_device *pdev)
 		if (ret) {
 			dev_err(tdev->device.dev,
 				"failed to register controller\n");
-			dma_async_device_unregister(&tdev->device);
+			return ret;
 		}
 	}
 

drivers/dma/mv_xor.c

@@ -348,9 +348,9 @@ static void mv_xor_tasklet(unsigned long data)
 {
 	struct mv_xor_chan *chan = (struct mv_xor_chan *) data;
 
-	spin_lock_bh(&chan->lock);
+	spin_lock(&chan->lock);
 	mv_chan_slot_cleanup(chan);
-	spin_unlock_bh(&chan->lock);
+	spin_unlock(&chan->lock);
 }
 
 static struct mv_xor_desc_slot *

drivers/dma/mxs-dma.c

@@ -847,7 +847,7 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 	mxs_dma->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
 	mxs_dma->dma_device.device_issue_pending = mxs_dma_enable_chan;
 
-	ret = dma_async_device_register(&mxs_dma->dma_device);
+	ret = dmaenginem_async_device_register(&mxs_dma->dma_device);
 	if (ret) {
 		dev_err(mxs_dma->dma_device.dev, "unable to register\n");
 		return ret;
@@ -857,7 +857,6 @@ static int __init mxs_dma_probe(struct platform_device *pdev)
 	if (ret) {
 		dev_err(mxs_dma->dma_device.dev,
 			"failed to register controller\n");
-		dma_async_device_unregister(&mxs_dma->dma_device);
 	}
 
 	dev_info(mxs_dma->dma_device.dev, "initialized\n");

drivers/dma/nbpfaxi.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Copyright (C) 2013-2014 Renesas Electronics Europe Ltd.
  * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
  */
 
 #include <linux/bitmap.h>
@@ -1095,8 +1092,8 @@ static struct dma_chan *nbpf_of_xlate(struct of_phandle_args *dma_spec,
 	if (!dchan)
 		return NULL;
 
-	dev_dbg(dchan->device->dev, "Entry %s(%s)\n", __func__,
-		dma_spec->np->name);
+	dev_dbg(dchan->device->dev, "Entry %s(%pOFn)\n", __func__,
+		dma_spec->np);
 
 	chan = nbpf_to_chan(dchan);
 

drivers/dma/ppc4xx/adma.c

@@ -4360,7 +4360,7 @@ static ssize_t enable_store(struct device_driver *dev, const char *buf,
 }
 static DRIVER_ATTR_RW(enable);
 
-static ssize_t poly_store(struct device_driver *dev, char *buf)
+static ssize_t poly_show(struct device_driver *dev, char *buf)
 {
 	ssize_t size = 0;
 	u32 reg;

drivers/dma/pxa_dma.c

@@ -1285,7 +1285,6 @@ static int pxad_remove(struct platform_device *op)
 
 	pxad_cleanup_debugfs(pdev);
 	pxad_free_channels(&pdev->slave);
-	dma_async_device_unregister(&pdev->slave);
 	return 0;
 }
 
@@ -1396,7 +1395,7 @@ static int pxad_init_dmadev(struct platform_device *op,
 		init_waitqueue_head(&c->wq_state);
 	}
 
-	return dma_async_device_register(&pdev->slave);
+	return dmaenginem_async_device_register(&pdev->slave);
 }
 
 static int pxad_probe(struct platform_device *op)
@@ -1433,7 +1432,7 @@ static int pxad_probe(struct platform_device *op)
 				 "#dma-requests set to default 32 as missing in OF: %d",
 				 ret);
 			nb_requestors = 32;
-		};
+		}
 	} else if (pdata && pdata->dma_channels) {
 		dma_channels = pdata->dma_channels;
 		nb_requestors = pdata->nb_requestors;

drivers/dma/sh/rcar-dmac.c

@@ -198,6 +198,7 @@ struct rcar_dmac {
 	struct dma_device engine;
 	struct device *dev;
 	void __iomem *iomem;
+	struct device_dma_parameters parms;
 
 	unsigned int n_channels;
 	struct rcar_dmac_chan *channels;
@@ -1792,6 +1793,8 @@ static int rcar_dmac_probe(struct platform_device *pdev)
 
 	dmac->dev = &pdev->dev;
 	platform_set_drvdata(pdev, dmac);
+	dmac->dev->dma_parms = &dmac->parms;
+	dma_set_max_seg_size(dmac->dev, RCAR_DMATCR_MASK);
 	dma_set_mask_and_coherent(dmac->dev, DMA_BIT_MASK(40));
 
 	ret = rcar_dmac_parse_of(&pdev->dev, dmac);

drivers/dma/sh/shdma-arm.h

+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Renesas SuperH DMA Engine support
  *
  * Copyright (C) 2013 Renesas Electronics, Inc.
- *
- * This is free software; you can redistribute it and/or modify it under the
- * terms of version 2 the GNU General Public License as published by the Free
- * Software Foundation.
  */
 
 #ifndef SHDMA_ARM_H

drivers/dma/sh/shdma-base.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Dmaengine driver base library for DMA controllers, found on SH-based SoCs
  *
@@ -7,10 +8,6 @@
  * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
  * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
  * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
  */
 
 #include <linux/delay.h>

drivers/dma/sh/shdma-of.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * SHDMA Device Tree glue
  *
  * Copyright (C) 2013 Renesas Electronics Inc.
  * Author: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
  */
 
 #include <linux/dmaengine.h>

drivers/dma/sh/shdma-r8a73a4.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Renesas SuperH DMA Engine support for r8a73a4 (APE6) SoCs
  *
  * Copyright (C) 2013 Renesas Electronics, Inc.
- *
- * This is free software; you can redistribute it and/or modify it under the
- * terms of version 2 the GNU General Public License as published by the Free
- * Software Foundation.
  */
 #include <linux/sh_dma.h>
 

drivers/dma/sh/shdma.h

+/* SPDX-License-Identifier: GPL-2.0+ */
 /*
  * Renesas SuperH DMA Engine support
  *
  * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
  * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
  *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
  */
 #ifndef __DMA_SHDMA_H
 #define __DMA_SHDMA_H

drivers/dma/sh/shdmac.c

+// SPDX-License-Identifier: GPL-2.0+
 /*
  * Renesas SuperH DMA Engine support
  *
@@ -8,11 +9,6 @@
  * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
  * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
  *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
  * - DMA of SuperH does not have Hardware DMA chain mode.
  * - MAX DMA size is 16MB.
  *

drivers/dma/sh/sudmac.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Renesas SUDMAC support
  *
@@ -8,10 +9,6 @@
  * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
  * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
  * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
  */
 
 #include <linux/dmaengine.h>

drivers/dma/sh/usb-dmac.c

+// SPDX-License-Identifier: GPL-2.0
 /*
  * Renesas USB DMA Controller Driver
  *
@@ -6,10 +7,6 @@
  * based on rcar-dmac.c
  * Copyright (C) 2014 Renesas Electronics Inc.
  * Author: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
- *
- * This is free software; you can redistribute it and/or modify
- * it under the terms of version 2 of the GNU General Public License as
- * published by the Free Software Foundation.
  */
 
 #include <linux/delay.h>

drivers/dma/sprd-dma.c

@@ -68,6 +68,7 @@
 
 /* SPRD_DMA_CHN_CFG register definition */
 #define SPRD_DMA_CHN_EN			BIT(0)
+#define SPRD_DMA_LINKLIST_EN		BIT(4)
 #define SPRD_DMA_WAIT_BDONE_OFFSET	24
 #define SPRD_DMA_DONOT_WAIT_BDONE	1
 
@@ -103,7 +104,7 @@
 #define SPRD_DMA_REQ_MODE_MASK		GENMASK(1, 0)
 #define SPRD_DMA_FIX_SEL_OFFSET		21
 #define SPRD_DMA_FIX_EN_OFFSET		20
-#define SPRD_DMA_LLIST_END_OFFSET	19
+#define SPRD_DMA_LLIST_END		BIT(19)
 #define SPRD_DMA_FRG_LEN_MASK		GENMASK(16, 0)
 
 /* SPRD_DMA_CHN_BLK_LEN register definition */
@@ -164,6 +165,7 @@ struct sprd_dma_desc {
 struct sprd_dma_chn {
 	struct virt_dma_chan	vc;
 	void __iomem		*chn_base;
+	struct sprd_dma_linklist	linklist;
 	struct dma_slave_config	slave_cfg;
 	u32			chn_num;
 	u32			dev_id;
@@ -582,7 +584,8 @@ static int sprd_dma_get_step(enum dma_slave_buswidth buswidth)
 }
 
 static int sprd_dma_fill_desc(struct dma_chan *chan,
-			      struct sprd_dma_desc *sdesc,
+			      struct sprd_dma_chn_hw *hw,
+			      unsigned int sglen, int sg_index,
 			      dma_addr_t src, dma_addr_t dst, u32 len,
 			      enum dma_transfer_direction dir,
 			      unsigned long flags,
@@ -590,7 +593,6 @@ static int sprd_dma_fill_desc(struct dma_chan *chan,
 {
 	struct sprd_dma_dev *sdev = to_sprd_dma_dev(chan);
 	struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
-	struct sprd_dma_chn_hw *hw = &sdesc->chn_hw;
 	u32 req_mode = (flags >> SPRD_DMA_REQ_SHIFT) & SPRD_DMA_REQ_MODE_MASK;
 	u32 int_mode = flags & SPRD_DMA_INT_MASK;
 	int src_datawidth, dst_datawidth, src_step, dst_step;
@@ -670,12 +672,52 @@ static int sprd_dma_fill_desc(struct dma_chan *chan,
 	temp |= (src_step & SPRD_DMA_TRSF_STEP_MASK) << SPRD_DMA_SRC_TRSF_STEP_OFFSET;
 	hw->trsf_step = temp;
 
+	/* link-list configuration */
+	if (schan->linklist.phy_addr) {
+		if (sg_index == sglen - 1)
+			hw->frg_len |= SPRD_DMA_LLIST_END;
+
+		hw->cfg |= SPRD_DMA_LINKLIST_EN;
+
+		/* link-list index */
+		temp = (sg_index + 1) % sglen;
+		/* Next link-list configuration's physical address offset */
+		temp = temp * sizeof(*hw) + SPRD_DMA_CHN_SRC_ADDR;
+		/*
+		 * Set the link-list pointer point to next link-list
+		 * configuration's physical address.
+		 */
+		hw->llist_ptr = schan->linklist.phy_addr + temp;
+	} else {
+		hw->llist_ptr = 0;
+	}
+
 	hw->frg_step = 0;
 	hw->src_blk_step = 0;
 	hw->des_blk_step = 0;
 	return 0;
 }
 
+static int sprd_dma_fill_linklist_desc(struct dma_chan *chan,
+				       unsigned int sglen, int sg_index,
+				       dma_addr_t src, dma_addr_t dst, u32 len,
+				       enum dma_transfer_direction dir,
+				       unsigned long flags,
+				       struct dma_slave_config *slave_cfg)
+{
+	struct sprd_dma_chn *schan = to_sprd_dma_chan(chan);
+	struct sprd_dma_chn_hw *hw;
+
+	if (!schan->linklist.virt_addr)
+		return -EINVAL;
+
+	hw = (struct sprd_dma_chn_hw *)(schan->linklist.virt_addr +
+					sg_index * sizeof(*hw));
+
+	return sprd_dma_fill_desc(chan, hw, sglen, sg_index, src, dst, len,
+				  dir, flags, slave_cfg);
+}
+
 static struct dma_async_tx_descriptor *
 sprd_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 			 size_t len, unsigned long flags)
@@ -744,10 +786,20 @@ sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 	u32 len = 0;
 	int ret, i;
 
-	/* TODO: now we only support one sg for each DMA configuration. */
-	if (!is_slave_direction(dir) || sglen > 1)
+	if (!is_slave_direction(dir))
 		return NULL;
 
+	if (context) {
+		struct sprd_dma_linklist *ll_cfg =
+			(struct sprd_dma_linklist *)context;
+
+		schan->linklist.phy_addr = ll_cfg->phy_addr;
+		schan->linklist.virt_addr = ll_cfg->virt_addr;
+	} else {
+		schan->linklist.phy_addr = 0;
+		schan->linklist.virt_addr = 0;
+	}
+
 	sdesc = kzalloc(sizeof(*sdesc), GFP_NOWAIT);
 	if (!sdesc)
 		return NULL;
@@ -762,10 +814,25 @@ sprd_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
 			src = slave_cfg->src_addr;
 			dst = sg_dma_address(sg);
 		}
+
+		/*
+		 * The link-list mode needs at least 2 link-list
+		 * configurations. If there is only one sg, it doesn't
+		 * need to fill the link-list configuration.
+		 */
+		if (sglen < 2)
+			break;
+
+		ret = sprd_dma_fill_linklist_desc(chan, sglen, i, src, dst, len,
+						  dir, flags, slave_cfg);
+		if (ret) {
+			kfree(sdesc);
+			return NULL;
+		}
 	}
 
-	ret = sprd_dma_fill_desc(chan, sdesc, src, dst, len, dir, flags,
-				 slave_cfg);
+	ret = sprd_dma_fill_desc(chan, &sdesc->chn_hw, 0, 0, src, dst, len,
+				 dir, flags, slave_cfg);
 	if (ret) {
 		kfree(sdesc);
 		return NULL;

drivers/dma/st_fdma.c

@@ -833,7 +833,7 @@ static int st_fdma_probe(struct platform_device *pdev)
 	fdev->dma_device.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
 	fdev->dma_device.residue_granularity = DMA_RESIDUE_GRANULARITY_BURST;
 
-	ret = dma_async_device_register(&fdev->dma_device);
+	ret = dmaenginem_async_device_register(&fdev->dma_device);
 	if (ret) {
 		dev_err(&pdev->dev,
 			"Failed to register DMA device (%d)\n", ret);
@@ -844,15 +844,13 @@ static int st_fdma_probe(struct platform_device *pdev)
 	if (ret) {
 		dev_err(&pdev->dev,
 			"Failed to register controller (%d)\n", ret);
-		goto err_dma_dev;
+		goto err_rproc;
 	}
 
 	dev_info(&pdev->dev, "ST FDMA engine driver, irq:%d\n", fdev->irq);
 
 	return 0;
 
-err_dma_dev:
-	dma_async_device_unregister(&fdev->dma_device);
 err_rproc:
 	st_fdma_free(fdev);
 	st_slim_rproc_put(fdev->slim_rproc);
@@ -867,7 +865,6 @@ static int st_fdma_remove(struct platform_device *pdev)
 	devm_free_irq(&pdev->dev, fdev->irq, fdev);
 	st_slim_rproc_put(fdev->slim_rproc);
 	of_dma_controller_free(pdev->dev.of_node);
-	dma_async_device_unregister(&fdev->dma_device);
 
 	return 0;
 }

drivers/dma/ste_dma40.c

@@ -2839,7 +2839,7 @@ static int __init d40_dmaengine_init(struct d40_base *base,
 
 	d40_ops_init(base, &base->dma_slave);
 
-	err = dma_async_device_register(&base->dma_slave);
+	err = dmaenginem_async_device_register(&base->dma_slave);
 
 	if (err) {
 		d40_err(base->dev, "Failed to register slave channels\n");
@@ -2854,12 +2854,12 @@ static int __init d40_dmaengine_init(struct d40_base *base,
 
 	d40_ops_init(base, &base->dma_memcpy);
 
-	err = dma_async_device_register(&base->dma_memcpy);
+	err = dmaenginem_async_device_register(&base->dma_memcpy);
 
 	if (err) {
 		d40_err(base->dev,
 			"Failed to register memcpy only channels\n");
-		goto unregister_slave;
+		goto exit;
 	}
 
 	d40_chan_init(base, &base->dma_both, base->phy_chans,
@@ -2871,18 +2871,14 @@ static int __init d40_dmaengine_init(struct d40_base *base,
 	dma_cap_set(DMA_CYCLIC, base->dma_slave.cap_mask);
 
 	d40_ops_init(base, &base->dma_both);
-	err = dma_async_device_register(&base->dma_both);
+	err = dmaenginem_async_device_register(&base->dma_both);
 
 	if (err) {
 		d40_err(base->dev,
 			"Failed to register logical and physical capable channels\n");
-		goto unregister_memcpy;
+		goto exit;
 	}
 	return 0;
- unregister_memcpy:
-	dma_async_device_unregister(&base->dma_memcpy);
- unregister_slave:
-	dma_async_device_unregister(&base->dma_slave);
  exit:
 	return err;
 }

drivers/dma/stm32-dma.c

@@ -308,20 +308,12 @@ static bool stm32_dma_fifo_threshold_is_allowed(u32 burst, u32 threshold,
 
 static bool stm32_dma_is_burst_possible(u32 buf_len, u32 threshold)
 {
-	switch (threshold) {
-	case STM32_DMA_FIFO_THRESHOLD_FULL:
-		if (buf_len >= STM32_DMA_MAX_BURST)
-			return true;
-		else
-			return false;
-	case STM32_DMA_FIFO_THRESHOLD_HALFFULL:
-		if (buf_len >= STM32_DMA_MAX_BURST / 2)
-			return true;
-		else
-			return false;
-	default:
-		return false;
-	}
+	/*
+	 * Buffer or period length has to be aligned on FIFO depth.
+	 * Otherwise bytes may be stuck within FIFO at buffer or period
+	 * length.
+	 */
+	return ((buf_len % ((threshold + 1) * 4)) == 0);
 }
 
 static u32 stm32_dma_get_best_burst(u32 buf_len, u32 max_burst, u32 threshold,

drivers/dma/stm32-mdma.c

@@ -1656,7 +1656,7 @@ static int stm32_mdma_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	ret = dma_async_device_register(dd);
+	ret = dmaenginem_async_device_register(dd);
 	if (ret)
 		return ret;
 
@@ -1674,8 +1674,6 @@ static int stm32_mdma_probe(struct platform_device *pdev)
 	return 0;
 
 err_unregister:
-	dma_async_device_unregister(dd);
-
 	return ret;
 }
 

drivers/dma/timb_dma.c

@@ -545,7 +545,7 @@ static struct dma_async_tx_descriptor *td_prep_slave_sg(struct dma_chan *chan,
 	}
 
 	dma_sync_single_for_device(chan2dmadev(chan), td_desc->txd.phys,
-		td_desc->desc_list_len, DMA_MEM_TO_DEV);
+		td_desc->desc_list_len, DMA_TO_DEVICE);
 
 	return &td_desc->txd;
 }

include/linux/dma/sprd-dma.h

@@ -58,4 +58,73 @@ enum sprd_dma_int_type {
 	SPRD_DMA_CFGERR_INT,
 };
 
+/*
+ * struct sprd_dma_linklist - DMA link-list address structure
+ * @virt_addr: link-list virtual address to configure link-list node
+ * @phy_addr: link-list physical address to link DMA transfer
+ *
+ * The Spreadtrum DMA controller supports the link-list mode, that means slaves
+ * can supply several groups configurations (each configuration represents one
+ * DMA transfer) saved in memory, and DMA controller will link these groups
+ * configurations by writing the physical address of each configuration into the
+ * link-list register.
+ *
+ * Just as shown below, the link-list pointer register will be pointed to the
+ * physical address of 'configuration 1', and the 'configuration 1' link-list
+ * pointer will be pointed to 'configuration 2', and so on.
+ * Once trigger the DMA transfer, the DMA controller will load 'configuration
+ * 1' to its registers automatically, after 'configuration 1' transaction is
+ * done, DMA controller will load 'configuration 2' automatically, until all
+ * DMA transactions are done.
+ *
+ * Note: The last link-list pointer should point to the physical address
+ * of 'configuration 1', which can avoid DMA controller loads incorrect
+ * configuration when the last configuration transaction is done.
+ *
+ *     DMA controller                    linklist memory
+ * ======================             -----------------------
+ *|                      |           |    configuration 1    |<---
+ *|   DMA controller     |   ------->|                       |   |
+ *|                      |   |       |                       |   |
+ *|                      |   |       |                       |   |
+ *|                      |   |       |                       |   |
+ *| linklist pointer reg |----   ----|    linklist pointer   |   |
+ * ======================        |    -----------------------    |
+ *                               |                               |
+ *                               |    -----------------------    |
+ *                               |   |    configuration 2    |   |
+ *                               --->|                       |   |
+ *                                   |                       |   |
+ *                                   |                       |   |
+ *                                   |                       |   |
+ *                               ----|    linklist pointer   |   |
+ *                               |    -----------------------    |
+ *                               |                               |
+ *                               |    -----------------------    |
+ *                               |   |    configuration 3    |   |
+ *                               --->|                       |   |
+ *                                   |                       |   |
+ *                                   |           .           |   |
+ *                                               .               |
+ *                                               .               |
+ *                                               .               |
+ *                               |               .               |
+ *                               |    -----------------------    |
+ *                               |   |    configuration n    |   |
+ *                               --->|                       |   |
+ *                                   |                       |   |
+ *                                   |                       |   |
+ *                                   |                       |   |
+ *                                   |    linklist pointer   |----
+ *                                    -----------------------
+ *
+ * To support the link-list mode, DMA slaves should allocate one segment memory
+ * from always-on IRAM or dma coherent memory to store these groups of DMA
+ * configuration, and pass the virtual and physical address to DMA controller.
+ */
+struct sprd_dma_linklist {
+	unsigned long virt_addr;
+	phys_addr_t phy_addr;
+};
+
 #endif

include/linux/platform_data/dma-ep93xx.h

@@ -85,7 +85,7 @@ static inline enum dma_transfer_direction
 ep93xx_dma_chan_direction(struct dma_chan *chan)
 {
 	if (!ep93xx_dma_chan_is_m2p(chan))
-		return DMA_NONE;
+		return DMA_TRANS_NONE;
 
 	/* even channels are for TX, odd for RX */
 	return (chan->chan_id % 2 == 0) ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM;

include/linux/platform_data/dma-mcf-edma.h

+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Freescale eDMA platform data, ColdFire SoC's family.
+ *
+ * Copyright (c) 2017 Angelo Dureghello <angelo@sysam.it>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __LINUX_PLATFORM_DATA_MCF_EDMA_H__
+#define __LINUX_PLATFORM_DATA_MCF_EDMA_H__
+
+struct dma_slave_map;
+
+bool mcf_edma_filter_fn(struct dma_chan *chan, void *param);
+
+#define MCF_EDMA_FILTER_PARAM(ch)	((void *)ch)
+
+/**
+ * struct mcf_edma_platform_data - platform specific data for eDMA engine
+ *
+ * @ver			The eDMA module version.
+ * @dma_channels	The number of eDMA channels.
+ */
+struct mcf_edma_platform_data {
+	int dma_channels;
+	const struct dma_slave_map *slave_map;
+	int slavecnt;
+};
+
+#endif /* __LINUX_PLATFORM_DATA_MCF_EDMA_H__ */