Merge branch 'topic/sh' into for-linus

Conflicts:
	drivers/dma/sh/Kconfig
	drivers/dma/sh/shdmac.c

Signed-off-by: Vinod Koul <vinod.koul@intel.com>

Documentation/devicetree/bindings/dma/shdma.txt

@@ -22,42 +22,51 @@ Optional properties (currently unused):
 * DMA controller
 
 Required properties:
-- compatible:	should be "renesas,shdma"
+- compatible:	should be of the form "renesas,shdma-<soc>", where <soc> should
+		be replaced with the desired SoC model, e.g.
+		"renesas,shdma-r8a73a4" for the system DMAC on r8a73a4 SoC
 
 Example:
-	dmac: dma-mux0 {
+	dmac: dma-multiplexer@0 {
 		compatible = "renesas,shdma-mux";
 		#dma-cells = <1>;
-		dma-channels = <6>;
+		dma-channels = <20>;
 		dma-requests = <256>;
-		reg = <0 0>;	/* Needed for AUXDATA */
-		#address-cells = <1>;
-		#size-cells = <1>;
+		#address-cells = <2>;
+		#size-cells = <2>;
 		ranges;
 
-		dma0: shdma@fe008020 {
-			compatible = "renesas,shdma";
-			reg = <0xfe008020 0x270>,
-				<0xfe009000 0xc>;
+		dma0: dma-controller@e6700020 {
+			compatible = "renesas,shdma-r8a73a4";
+			reg = <0 0xe6700020 0 0x89e0>;
 			interrupt-parent = <&gic>;
-			interrupts = <0 34 4
-					0 28 4
-					0 29 4
-					0 30 4
-					0 31 4
-					0 32 4
-					0 33 4>;
+			interrupts = <0 220 4
+					0 200 4
+					0 201 4
+					0 202 4
+					0 203 4
+					0 204 4
+					0 205 4
+					0 206 4
+					0 207 4
+					0 208 4
+					0 209 4
+					0 210 4
+					0 211 4
+					0 212 4
+					0 213 4
+					0 214 4
+					0 215 4
+					0 216 4
+					0 217 4
+					0 218 4
+					0 219 4>;
 			interrupt-names = "error",
 					"ch0", "ch1", "ch2", "ch3",
-					"ch4", "ch5";
-		};
-
-		dma1: shdma@fe018020 {
-			...
-		};
-
-		dma2: shdma@fe028020 {
-			...
+					"ch4", "ch5", "ch6", "ch7",
+					"ch8", "ch9", "ch10", "ch11",
+					"ch12", "ch13", "ch14", "ch15",
+					"ch16", "ch17", "ch18", "ch19";
 		};
 	};
 

drivers/dma/sh/Kconfig

@@ -28,3 +28,7 @@ config RCAR_HPB_DMAE
 	depends on SH_DMAE_BASE
 	help
 	  Enable support for the Renesas R-Car series DMA controllers.
+
+config SHDMA_R8A73A4
+	def_bool y
+	depends on ARCH_R8A73A4 && SH_DMAE != n

drivers/dma/sh/Makefile

@@ -1,4 +1,9 @@
 obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o
 obj-$(CONFIG_SH_DMAE) += shdma.o
+shdma-y := shdmac.o
+ifeq ($(CONFIG_OF),y)
+shdma-$(CONFIG_SHDMA_R8A73A4) += shdma-r8a73a4.o
+endif
+shdma-objs := $(shdma-y)
 obj-$(CONFIG_SUDMAC) += sudmac.o
 obj-$(CONFIG_RCAR_HPB_DMAE) += rcar-hpbdma.o

drivers/dma/sh/shdma-arm.h

@@ -0,0 +1,51 @@
+/*
+ * 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
+#define SHDMA_ARM_H
+
+#include "shdma.h"
+
+/* Transmit sizes and respective CHCR register values */
+enum {
+	XMIT_SZ_8BIT		= 0,
+	XMIT_SZ_16BIT		= 1,
+	XMIT_SZ_32BIT		= 2,
+	XMIT_SZ_64BIT		= 7,
+	XMIT_SZ_128BIT		= 3,
+	XMIT_SZ_256BIT		= 4,
+	XMIT_SZ_512BIT		= 5,
+};
+
+/* log2(size / 8) - used to calculate number of transfers */
+#define SH_DMAE_TS_SHIFT {		\
+	[XMIT_SZ_8BIT]		= 0,	\
+	[XMIT_SZ_16BIT]		= 1,	\
+	[XMIT_SZ_32BIT]		= 2,	\
+	[XMIT_SZ_64BIT]		= 3,	\
+	[XMIT_SZ_128BIT]	= 4,	\
+	[XMIT_SZ_256BIT]	= 5,	\
+	[XMIT_SZ_512BIT]	= 6,	\
+}
+
+#define TS_LOW_BIT	0x3 /* --xx */
+#define TS_HI_BIT	0xc /* xx-- */
+
+#define TS_LOW_SHIFT	(3)
+#define TS_HI_SHIFT	(20 - 2)	/* 2 bits for shifted low TS */
+
+#define TS_INDEX2VAL(i) \
+	((((i) & TS_LOW_BIT) << TS_LOW_SHIFT) |\
+	 (((i) & TS_HI_BIT)  << TS_HI_SHIFT))
+
+#define CHCR_TX(xmit_sz) (DM_FIX | SM_INC | 0x800 | TS_INDEX2VAL((xmit_sz)))
+#define CHCR_RX(xmit_sz) (DM_INC | SM_FIX | 0x800 | TS_INDEX2VAL((xmit_sz)))
+
+#endif

drivers/dma/sh/shdma-base.c

@@ -171,7 +171,8 @@ static struct shdma_desc *shdma_get_desc(struct shdma_chan *schan)
 	return NULL;
 }
 
-static int shdma_setup_slave(struct shdma_chan *schan, int slave_id)
+static int shdma_setup_slave(struct shdma_chan *schan, int slave_id,
+			     dma_addr_t slave_addr)
 {
 	struct shdma_dev *sdev = to_shdma_dev(schan->dma_chan.device);
 	const struct shdma_ops *ops = sdev->ops;
@@ -179,7 +180,7 @@ static int shdma_setup_slave(struct shdma_chan *schan, int slave_id)
 
 	if (schan->dev->of_node) {
 		match = schan->hw_req;
-		ret = ops->set_slave(schan, match, true);
+		ret = ops->set_slave(schan, match, slave_addr, true);
 		if (ret < 0)
 			return ret;
 
@@ -194,7 +195,7 @@ static int shdma_setup_slave(struct shdma_chan *schan, int slave_id)
 	if (test_and_set_bit(slave_id, shdma_slave_used))
 		return -EBUSY;
 
-	ret = ops->set_slave(schan, match, false);
+	ret = ops->set_slave(schan, match, slave_addr, false);
 	if (ret < 0) {
 		clear_bit(slave_id, shdma_slave_used);
 		return ret;
@@ -236,7 +237,7 @@ bool shdma_chan_filter(struct dma_chan *chan, void *arg)
 	if (!schan->dev->of_node && match >= slave_num)
 		return false;
 
-	ret = ops->set_slave(schan, match, true);
+	ret = ops->set_slave(schan, match, 0, true);
 	if (ret < 0)
 		return false;
 
@@ -259,7 +260,7 @@ static int shdma_alloc_chan_resources(struct dma_chan *chan)
 	 */
 	if (slave) {
 		/* Legacy mode: .private is set in filter */
-		ret = shdma_setup_slave(schan, slave->slave_id);
+		ret = shdma_setup_slave(schan, slave->slave_id, 0);
 		if (ret < 0)
 			goto esetslave;
 	} else {
@@ -680,7 +681,9 @@ static int shdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
 		 * channel, while using it...
 		 */
 		config = (struct dma_slave_config *)arg;
-		ret = shdma_setup_slave(schan, config->slave_id);
+		ret = shdma_setup_slave(schan, config->slave_id,
+					config->direction == DMA_DEV_TO_MEM ?
+					config->src_addr : config->dst_addr);
 		if (ret < 0)
 			return ret;
 		break;
@@ -831,8 +834,8 @@ static irqreturn_t chan_irqt(int irq, void *dev)
 int shdma_request_irq(struct shdma_chan *schan, int irq,
 			   unsigned long flags, const char *name)
 {
-	int ret = request_threaded_irq(irq, chan_irq, chan_irqt,
-				       flags, name, schan);
+	int ret = devm_request_threaded_irq(schan->dev, irq, chan_irq,
+					    chan_irqt, flags, name, schan);
 
 	schan->irq = ret < 0 ? ret : irq;
 
@@ -840,13 +843,6 @@ int shdma_request_irq(struct shdma_chan *schan, int irq,
 }
 EXPORT_SYMBOL(shdma_request_irq);
 
-void shdma_free_irq(struct shdma_chan *schan)
-{
-	if (schan->irq >= 0)
-		free_irq(schan->irq, schan);
-}
-EXPORT_SYMBOL(shdma_free_irq);
-
 void shdma_chan_probe(struct shdma_dev *sdev,
 			   struct shdma_chan *schan, int id)
 {

drivers/dma/sh/shdma-of.c

@@ -45,9 +45,6 @@ static int shdma_of_probe(struct platform_device *pdev)
 	const struct of_dev_auxdata *lookup = dev_get_platdata(&pdev->dev);
 	int ret;
 
-	if (!lookup)
-		return -EINVAL;
-
 	ret = of_dma_controller_register(pdev->dev.of_node,
 					 shdma_of_xlate, pdev);
 	if (ret < 0)

drivers/dma/sh/shdma-r8a73a4.c

@@ -0,0 +1,77 @@
+/*
+ * 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>
+
+#include "shdma-arm.h"
+
+const unsigned int dma_ts_shift[] = SH_DMAE_TS_SHIFT;
+
+static const struct sh_dmae_slave_config dma_slaves[] = {
+	{
+		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xd1,		/* MMC0 Tx */
+	}, {
+		.chcr		= CHCR_RX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xd2,		/* MMC0 Rx */
+	}, {
+		.chcr		= CHCR_TX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xe1,		/* MMC1 Tx */
+	}, {
+		.chcr		= CHCR_RX(XMIT_SZ_32BIT),
+		.mid_rid	= 0xe2,		/* MMC1 Rx */
+	},
+};
+
+#define DMAE_CHANNEL(a, b)				\
+	{						\
+		.offset         = (a) - 0x20,		\
+		.dmars          = (a) - 0x20 + 0x40,	\
+		.chclr_bit	= (b),			\
+		.chclr_offset	= 0x80 - 0x20,		\
+	}
+
+static const struct sh_dmae_channel dma_channels[] = {
+	DMAE_CHANNEL(0x8000, 0),
+	DMAE_CHANNEL(0x8080, 1),
+	DMAE_CHANNEL(0x8100, 2),
+	DMAE_CHANNEL(0x8180, 3),
+	DMAE_CHANNEL(0x8200, 4),
+	DMAE_CHANNEL(0x8280, 5),
+	DMAE_CHANNEL(0x8300, 6),
+	DMAE_CHANNEL(0x8380, 7),
+	DMAE_CHANNEL(0x8400, 8),
+	DMAE_CHANNEL(0x8480, 9),
+	DMAE_CHANNEL(0x8500, 10),
+	DMAE_CHANNEL(0x8580, 11),
+	DMAE_CHANNEL(0x8600, 12),
+	DMAE_CHANNEL(0x8680, 13),
+	DMAE_CHANNEL(0x8700, 14),
+	DMAE_CHANNEL(0x8780, 15),
+	DMAE_CHANNEL(0x8800, 16),
+	DMAE_CHANNEL(0x8880, 17),
+	DMAE_CHANNEL(0x8900, 18),
+	DMAE_CHANNEL(0x8980, 19),
+};
+
+const struct sh_dmae_pdata r8a73a4_dma_pdata = {
+	.slave		= dma_slaves,
+	.slave_num	= ARRAY_SIZE(dma_slaves),
+	.channel	= dma_channels,
+	.channel_num	= ARRAY_SIZE(dma_channels),
+	.ts_low_shift	= TS_LOW_SHIFT,
+	.ts_low_mask	= TS_LOW_BIT << TS_LOW_SHIFT,
+	.ts_high_shift	= TS_HI_SHIFT,
+	.ts_high_mask	= TS_HI_BIT << TS_HI_SHIFT,
+	.ts_shift	= dma_ts_shift,
+	.ts_shift_num	= ARRAY_SIZE(dma_ts_shift),
+	.dmaor_init     = DMAOR_DME,
+	.chclr_present	= 1,
+	.chclr_bitwise	= 1,
+};

drivers/dma/sh/shdma.h

@@ -28,18 +28,19 @@ struct sh_dmae_chan {
 	struct shdma_chan shdma_chan;
 	const struct sh_dmae_slave_config *config; /* Slave DMA configuration */
 	int xmit_shift;			/* log_2(bytes_per_xfer) */
-	u32 __iomem *base;
+	void __iomem *base;
 	char dev_id[16];		/* unique name per DMAC of channel */
 	int pm_error;
+	dma_addr_t slave_addr;
 };
 
 struct sh_dmae_device {
 	struct shdma_dev shdma_dev;
 	struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
-	struct sh_dmae_pdata *pdata;
+	const struct sh_dmae_pdata *pdata;
 	struct list_head node;
-	u32 __iomem *chan_reg;
-	u16 __iomem *dmars;
+	void __iomem *chan_reg;
+	void __iomem *dmars;
 	unsigned int chcr_offset;
 	u32 chcr_ie_bit;
 };
@@ -61,4 +62,11 @@ struct sh_dmae_desc {
 #define to_sh_dev(chan) container_of(chan->shdma_chan.dma_chan.device,\
 				     struct sh_dmae_device, shdma_dev.dma_dev)
 
+#ifdef CONFIG_SHDMA_R8A73A4
+extern const struct sh_dmae_pdata r8a73a4_dma_pdata;
+#define r8a73a4_shdma_devid (&r8a73a4_dma_pdata)
+#else
+#define r8a73a4_shdma_devid NULL
+#endif
+
 #endif	/* __DMA_SHDMA_H */

drivers/dma/sh/shdma.c → drivers/dma/sh/shdmac.c

@@ -20,6 +20,8 @@
 
 #include <linux/init.h>
 #include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/slab.h>
 #include <linux/interrupt.h>
 #include <linux/dmaengine.h>
@@ -35,6 +37,15 @@
 #include "../dmaengine.h"
 #include "shdma.h"
 
+/* DMA register */
+#define SAR	0x00
+#define DAR	0x04
+#define TCR	0x08
+#define CHCR	0x0C
+#define DMAOR	0x40
+
+#define TEND	0x18 /* USB-DMAC */
+
 #define SH_DMAE_DRV_NAME "sh-dma-engine"
 
 /* Default MEMCPY transfer size = 2^2 = 4 bytes */
@@ -49,27 +60,37 @@
 static DEFINE_SPINLOCK(sh_dmae_lock);
 static LIST_HEAD(sh_dmae_devices);
 
-static void chclr_write(struct sh_dmae_chan *sh_dc, u32 data)
+/*
+ * Different DMAC implementations provide different ways to clear DMA channels:
+ * (1) none - no CHCLR registers are available
+ * (2) one CHCLR register per channel - 0 has to be written to it to clear
+ *     channel buffers
+ * (3) one CHCLR per several channels - 1 has to be written to the bit,
+ *     corresponding to the specific channel to reset it
+ */
+static void channel_clear(struct sh_dmae_chan *sh_dc)
 {
 	struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
+	const struct sh_dmae_channel *chan_pdata = shdev->pdata->channel +
+		sh_dc->shdma_chan.id;
+	u32 val = shdev->pdata->chclr_bitwise ? 1 << chan_pdata->chclr_bit : 0;
 
-	__raw_writel(data, shdev->chan_reg +
-		     shdev->pdata->channel[sh_dc->shdma_chan.id].chclr_offset);
+	__raw_writel(val, shdev->chan_reg + chan_pdata->chclr_offset);
 }
 
 static void sh_dmae_writel(struct sh_dmae_chan *sh_dc, u32 data, u32 reg)
 {
-	__raw_writel(data, sh_dc->base + reg / sizeof(u32));
+	__raw_writel(data, sh_dc->base + reg);
 }
 
 static u32 sh_dmae_readl(struct sh_dmae_chan *sh_dc, u32 reg)
 {
-	return __raw_readl(sh_dc->base + reg / sizeof(u32));
+	return __raw_readl(sh_dc->base + reg);
 }
 
 static u16 dmaor_read(struct sh_dmae_device *shdev)
 {
-	u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
+	void __iomem *addr = shdev->chan_reg + DMAOR;
 
 	if (shdev->pdata->dmaor_is_32bit)
 		return __raw_readl(addr);
@@ -79,7 +100,7 @@ static u16 dmaor_read(struct sh_dmae_device *shdev)
 
 static void dmaor_write(struct sh_dmae_device *shdev, u16 data)
 {
-	u32 __iomem *addr = shdev->chan_reg + DMAOR / sizeof(u32);
+	void __iomem *addr = shdev->chan_reg + DMAOR;
 
 	if (shdev->pdata->dmaor_is_32bit)
 		__raw_writel(data, addr);
@@ -91,14 +112,14 @@ static void chcr_write(struct sh_dmae_chan *sh_dc, u32 data)
 {
 	struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
 
-	__raw_writel(data, sh_dc->base + shdev->chcr_offset / sizeof(u32));
+	__raw_writel(data, sh_dc->base + shdev->chcr_offset);
 }
 
 static u32 chcr_read(struct sh_dmae_chan *sh_dc)
 {
 	struct sh_dmae_device *shdev = to_sh_dev(sh_dc);
 
-	return __raw_readl(sh_dc->base + shdev->chcr_offset / sizeof(u32));
+	return __raw_readl(sh_dc->base + shdev->chcr_offset);
 }
 
 /*
@@ -133,7 +154,7 @@ static int sh_dmae_rst(struct sh_dmae_device *shdev)
 		for (i = 0; i < shdev->pdata->channel_num; i++) {
 			struct sh_dmae_chan *sh_chan = shdev->chan[i];
 			if (sh_chan)
-				chclr_write(sh_chan, 0);
+				channel_clear(sh_chan);
 		}
 	}
 
@@ -167,7 +188,7 @@ static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
 static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
 {
 	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	struct sh_dmae_pdata *pdata = shdev->pdata;
+	const struct sh_dmae_pdata *pdata = shdev->pdata;
 	int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
 		((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
 
@@ -180,7 +201,7 @@ static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
 static u32 log2size_to_chcr(struct sh_dmae_chan *sh_chan, int l2size)
 {
 	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	struct sh_dmae_pdata *pdata = shdev->pdata;
+	const struct sh_dmae_pdata *pdata = shdev->pdata;
 	int i;
 
 	for (i = 0; i < pdata->ts_shift_num; i++)
@@ -240,9 +261,9 @@ static int dmae_set_chcr(struct sh_dmae_chan *sh_chan, u32 val)
 static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
 {
 	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	struct sh_dmae_pdata *pdata = shdev->pdata;
+	const struct sh_dmae_pdata *pdata = shdev->pdata;
 	const struct sh_dmae_channel *chan_pdata = &pdata->channel[sh_chan->shdma_chan.id];
-	u16 __iomem *addr = shdev->dmars;
+	void __iomem *addr = shdev->dmars;
 	unsigned int shift = chan_pdata->dmars_bit;
 
 	if (dmae_is_busy(sh_chan))
@@ -253,8 +274,8 @@ static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
 
 	/* in the case of a missing DMARS resource use first memory window */
 	if (!addr)
-		addr = (u16 __iomem *)shdev->chan_reg;
-	addr += chan_pdata->dmars / sizeof(u16);
+		addr = shdev->chan_reg;
+	addr += chan_pdata->dmars;
 
 	__raw_writew((__raw_readw(addr) & (0xff00 >> shift)) | (val << shift),
 		     addr);
@@ -309,7 +330,7 @@ static const struct sh_dmae_slave_config *dmae_find_slave(
 	struct sh_dmae_chan *sh_chan, int match)
 {
 	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
-	struct sh_dmae_pdata *pdata = shdev->pdata;
+	const struct sh_dmae_pdata *pdata = shdev->pdata;
 	const struct sh_dmae_slave_config *cfg;
 	int i;
 
@@ -323,7 +344,7 @@ static const struct sh_dmae_slave_config *dmae_find_slave(
 	} else {
 		for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
 			if (cfg->mid_rid == match) {
-				sh_chan->shdma_chan.slave_id = cfg->slave_id;
+				sh_chan->shdma_chan.slave_id = i;
 				return cfg;
 			}
 	}
@@ -332,7 +353,7 @@ static const struct sh_dmae_slave_config *dmae_find_slave(
 }
 
 static int sh_dmae_set_slave(struct shdma_chan *schan,
-			     int slave_id, bool try)
+			     int slave_id, dma_addr_t slave_addr, bool try)
 {
 	struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
 						    shdma_chan);
@@ -340,8 +361,10 @@ static int sh_dmae_set_slave(struct shdma_chan *schan,
 	if (!cfg)
 		return -ENXIO;
 
-	if (!try)
+	if (!try) {
 		sh_chan->config = cfg;
+		sh_chan->slave_addr = slave_addr ? : cfg->addr;
+	}
 
 	return 0;
 }
@@ -505,7 +528,8 @@ static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
 	struct shdma_chan *schan;
 	int err;
 
-	sh_chan = kzalloc(sizeof(struct sh_dmae_chan), GFP_KERNEL);
+	sh_chan = devm_kzalloc(sdev->dma_dev.dev, sizeof(struct sh_dmae_chan),
+			       GFP_KERNEL);
 	if (!sh_chan) {
 		dev_err(sdev->dma_dev.dev,
 			"No free memory for allocating dma channels!\n");
@@ -517,7 +541,7 @@ static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
 
 	shdma_chan_probe(sdev, schan, id);
 
-	sh_chan->base = shdev->chan_reg + chan_pdata->offset / sizeof(u32);
+	sh_chan->base = shdev->chan_reg + chan_pdata->offset;
 
 	/* set up channel irq */
 	if (pdev->id >= 0)
@@ -541,7 +565,6 @@ static int sh_dmae_chan_probe(struct sh_dmae_device *shdev, int id,
 err_no_irq:
 	/* remove from dmaengine device node */
 	shdma_chan_remove(schan);
-	kfree(sh_chan);
 	return err;
 }
 
@@ -552,14 +575,9 @@ static void sh_dmae_chan_remove(struct sh_dmae_device *shdev)
 	int i;
 
 	shdma_for_each_chan(schan, &shdev->shdma_dev, i) {
-		struct sh_dmae_chan *sh_chan = container_of(schan,
-					struct sh_dmae_chan, shdma_chan);
 		BUG_ON(!schan);
 
-		shdma_free_irq(&sh_chan->shdma_chan);
-
 		shdma_chan_remove(schan);
-		kfree(sh_chan);
 	}
 	dma_dev->chancnt = 0;
 }
@@ -636,7 +654,7 @@ static dma_addr_t sh_dmae_slave_addr(struct shdma_chan *schan)
 	 * This is an exclusive slave DMA operation, may only be called after a
 	 * successful slave configuration.
 	 */
-	return sh_chan->config->addr;
+	return sh_chan->slave_addr;
 }
 
 static struct shdma_desc *sh_dmae_embedded_desc(void *buf, int i)
@@ -658,9 +676,15 @@ static const struct shdma_ops sh_dmae_shdma_ops = {
 	.get_partial = sh_dmae_get_partial,
 };
 
+static const struct of_device_id sh_dmae_of_match[] = {
+	{.compatible = "renesas,shdma-r8a73a4", .data = r8a73a4_shdma_devid,},
+	{}
+};
+MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
+
 static int sh_dmae_probe(struct platform_device *pdev)
 {
-	struct sh_dmae_pdata *pdata = dev_get_platdata(&pdev->dev);
+	const struct sh_dmae_pdata *pdata;
 	unsigned long irqflags = IRQF_DISABLED,
 		chan_flag[SH_DMAE_MAX_CHANNELS] = {};
 	int errirq, chan_irq[SH_DMAE_MAX_CHANNELS];
@@ -669,6 +693,11 @@ static int sh_dmae_probe(struct platform_device *pdev)
 	struct dma_device *dma_dev;
 	struct resource *chan, *dmars, *errirq_res, *chanirq_res;
 
+	if (pdev->dev.of_node)
+		pdata = of_match_device(sh_dmae_of_match, &pdev->dev)->data;
+	else
+		pdata = dev_get_platdata(&pdev->dev);
+
 	/* get platform data */
 	if (!pdata || !pdata->channel_num)
 		return -ENODEV;
@@ -696,33 +725,22 @@ static int sh_dmae_probe(struct platform_device *pdev)
 	if (!chan || !errirq_res)
 		return -ENODEV;
 
-	if (!request_mem_region(chan->start, resource_size(chan), pdev->name)) {
-		dev_err(&pdev->dev, "DMAC register region already claimed\n");
-		return -EBUSY;
-	}
-
-	if (dmars && !request_mem_region(dmars->start, resource_size(dmars), pdev->name)) {
-		dev_err(&pdev->dev, "DMAC DMARS region already claimed\n");
-		err = -EBUSY;
-		goto ermrdmars;
-	}
-
-	err = -ENOMEM;
-	shdev = kzalloc(sizeof(struct sh_dmae_device), GFP_KERNEL);
+	shdev = devm_kzalloc(&pdev->dev, sizeof(struct sh_dmae_device),
+			     GFP_KERNEL);
 	if (!shdev) {
 		dev_err(&pdev->dev, "Not enough memory\n");
-		goto ealloc;
+		return -ENOMEM;
 	}
 
 	dma_dev = &shdev->shdma_dev.dma_dev;
 
-	shdev->chan_reg = ioremap(chan->start, resource_size(chan));
-	if (!shdev->chan_reg)
-		goto emapchan;
+	shdev->chan_reg = devm_ioremap_resource(&pdev->dev, chan);
+	if (IS_ERR(shdev->chan_reg))
+		return PTR_ERR(shdev->chan_reg);
 	if (dmars) {
-		shdev->dmars = ioremap(dmars->start, resource_size(dmars));
-		if (!shdev->dmars)
-			goto emapdmars;
+		shdev->dmars = devm_ioremap_resource(&pdev->dev, dmars);
+		if (IS_ERR(shdev->dmars))
+			return PTR_ERR(shdev->dmars);
 	}
 
 	if (!pdata->slave_only)
@@ -783,8 +801,8 @@ static int sh_dmae_probe(struct platform_device *pdev)
 
 	errirq = errirq_res->start;
 
-	err = request_irq(errirq, sh_dmae_err, irqflags,
-			  "DMAC Address Error", shdev);
+	err = devm_request_irq(&pdev->dev, errirq, sh_dmae_err, irqflags,
+			       "DMAC Address Error", shdev);
 	if (err) {
 		dev_err(&pdev->dev,
 			"DMA failed requesting irq #%d, error %d\n",
@@ -862,7 +880,6 @@ chan_probe_err:
 	sh_dmae_chan_remove(shdev);
 
 #if defined(CONFIG_CPU_SH4) || defined(CONFIG_ARCH_SHMOBILE)
-	free_irq(errirq, shdev);
 eirq_err:
 #endif
 rst_err:
@@ -873,21 +890,9 @@ rst_err:
 	pm_runtime_put(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 
-	platform_set_drvdata(pdev, NULL);
 	shdma_cleanup(&shdev->shdma_dev);
 eshdma:
-	if (dmars)
-		iounmap(shdev->dmars);
-emapdmars:
-	iounmap(shdev->chan_reg);
 	synchronize_rcu();
-emapchan:
-	kfree(shdev);
-ealloc:
-	if (dmars)
-		release_mem_region(dmars->start, resource_size(dmars));
-ermrdmars:
-	release_mem_region(chan->start, resource_size(chan));
 
 	return err;
 }
@@ -896,14 +901,9 @@ static int sh_dmae_remove(struct platform_device *pdev)
 {
 	struct sh_dmae_device *shdev = platform_get_drvdata(pdev);
 	struct dma_device *dma_dev = &shdev->shdma_dev.dma_dev;
-	struct resource *res;
-	int errirq = platform_get_irq(pdev, 0);
 
 	dma_async_device_unregister(dma_dev);
 
-	if (errirq > 0)
-		free_irq(errirq, shdev);
-
 	spin_lock_irq(&sh_dmae_lock);
 	list_del_rcu(&shdev->node);
 	spin_unlock_irq(&sh_dmae_lock);
@@ -913,31 +913,11 @@ static int sh_dmae_remove(struct platform_device *pdev)
 	sh_dmae_chan_remove(shdev);
 	shdma_cleanup(&shdev->shdma_dev);
 
-	if (shdev->dmars)
-		iounmap(shdev->dmars);
-	iounmap(shdev->chan_reg);
-
-	platform_set_drvdata(pdev, NULL);
-
 	synchronize_rcu();
-	kfree(shdev);
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (res)
-		release_mem_region(res->start, resource_size(res));
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (res)
-		release_mem_region(res->start, resource_size(res));
 
 	return 0;
 }
 
-static const struct of_device_id sh_dmae_of_match[] = {
-	{ .compatible = "renesas,shdma", },
-	{ }
-};
-MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
-
 static struct platform_driver sh_dmae_driver = {
 	.driver 	= {
 		.owner	= THIS_MODULE,

drivers/dma/sh/sudmac.c

@@ -150,7 +150,8 @@ static const struct sudmac_slave_config *sudmac_find_slave(
 	return NULL;
 }
 
-static int sudmac_set_slave(struct shdma_chan *schan, int slave_id, bool try)
+static int sudmac_set_slave(struct shdma_chan *schan, int slave_id,
+			    dma_addr_t slave_addr, bool try)
 {
 	struct sudmac_chan *sc = to_chan(schan);
 	const struct sudmac_slave_config *cfg = sudmac_find_slave(sc, slave_id);
@@ -298,11 +299,8 @@ static void sudmac_chan_remove(struct sudmac_device *su_dev)
 	int i;
 
 	shdma_for_each_chan(schan, &su_dev->shdma_dev, i) {
-		struct sudmac_chan *sc = to_chan(schan);
-
 		BUG_ON(!schan);
 
-		shdma_free_irq(&sc->shdma_chan);
 		shdma_chan_remove(schan);
 	}
 	dma_dev->chancnt = 0;
@@ -393,7 +391,6 @@ static int sudmac_probe(struct platform_device *pdev)
 chan_probe_err:
 	sudmac_chan_remove(su_dev);
 
-	platform_set_drvdata(pdev, NULL);
 	shdma_cleanup(&su_dev->shdma_dev);
 
 	return err;
@@ -407,7 +404,6 @@ static int sudmac_remove(struct platform_device *pdev)
 	dma_async_device_unregister(dma_dev);
 	sudmac_chan_remove(su_dev);
 	shdma_cleanup(&su_dev->shdma_dev);
-	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }

include/linux/sh_dma.h

@@ -33,13 +33,44 @@ struct sh_dmae_slave_config {
 	char		mid_rid;
 };
 
+/**
+ * struct sh_dmae_channel - DMAC channel platform data
+ * @offset:		register offset within the main IOMEM resource
+ * @dmars:		channel DMARS register offset
+ * @chclr_offset:	channel CHCLR register offset
+ * @dmars_bit:		channel DMARS field offset within the register
+ * @chclr_bit:		bit position, to be set to reset the channel
+ */
 struct sh_dmae_channel {
 	unsigned int	offset;
 	unsigned int	dmars;
-	unsigned int	dmars_bit;
 	unsigned int	chclr_offset;
+	unsigned char	dmars_bit;
+	unsigned char	chclr_bit;
 };
 
+/**
+ * struct sh_dmae_pdata - DMAC platform data
+ * @slave:		array of slaves
+ * @slave_num:		number of slaves in the above array
+ * @channel:		array of DMA channels
+ * @channel_num:	number of channels in the above array
+ * @ts_low_shift:	shift of the low part of the TS field
+ * @ts_low_mask:	low TS field mask
+ * @ts_high_shift:	additional shift of the high part of the TS field
+ * @ts_high_mask:	high TS field mask
+ * @ts_shift:		array of Transfer Size shifts, indexed by TS value
+ * @ts_shift_num:	number of shifts in the above array
+ * @dmaor_init:		DMAOR initialisation value
+ * @chcr_offset:	CHCR address offset
+ * @chcr_ie_bit:	CHCR Interrupt Enable bit
+ * @dmaor_is_32bit:	DMAOR is a 32-bit register
+ * @needs_tend_set:	the TEND register has to be set
+ * @no_dmars:		DMAC has no DMARS registers
+ * @chclr_present:	DMAC has one or several CHCLR registers
+ * @chclr_bitwise:	channel CHCLR registers are bitwise
+ * @slave_only:		DMAC cannot be used for MEMCPY
+ */
 struct sh_dmae_pdata {
 	const struct sh_dmae_slave_config *slave;
 	int slave_num;
@@ -59,42 +90,22 @@ struct sh_dmae_pdata {
 	unsigned int needs_tend_set:1;
 	unsigned int no_dmars:1;
 	unsigned int chclr_present:1;
+	unsigned int chclr_bitwise:1;
 	unsigned int slave_only:1;
 };
 
-/* DMA register */
-#define SAR	0x00
-#define DAR	0x04
-#define TCR	0x08
-#define CHCR	0x0C
-#define DMAOR	0x40
-
-#define TEND	0x18 /* USB-DMAC */
-
 /* DMAOR definitions */
 #define DMAOR_AE	0x00000004
 #define DMAOR_NMIF	0x00000002
 #define DMAOR_DME	0x00000001
 
 /* Definitions for the SuperH DMAC */
-#define REQ_L	0x00000000
-#define REQ_E	0x00080000
-#define RACK_H	0x00000000
-#define RACK_L	0x00040000
-#define ACK_R	0x00000000
-#define ACK_W	0x00020000
-#define ACK_H	0x00000000
-#define ACK_L	0x00010000
 #define DM_INC	0x00004000
 #define DM_DEC	0x00008000
 #define DM_FIX	0x0000c000
 #define SM_INC	0x00001000
 #define SM_DEC	0x00002000
 #define SM_FIX	0x00003000
-#define RS_IN	0x00000200
-#define RS_OUT	0x00000300
-#define TS_BLK	0x00000040
-#define TM_BUR	0x00000020
 #define CHCR_DE	0x00000001
 #define CHCR_TE	0x00000002
 #define CHCR_IE	0x00000004

include/linux/shdma-base.h

@@ -96,7 +96,7 @@ struct shdma_ops {
 	dma_addr_t (*slave_addr)(struct shdma_chan *);
 	int (*desc_setup)(struct shdma_chan *, struct shdma_desc *,
 			  dma_addr_t, dma_addr_t, size_t *);
-	int (*set_slave)(struct shdma_chan *, int, bool);
+	int (*set_slave)(struct shdma_chan *, int, dma_addr_t, bool);
 	void (*setup_xfer)(struct shdma_chan *, int);
 	void (*start_xfer)(struct shdma_chan *, struct shdma_desc *);
 	struct shdma_desc *(*embedded_desc)(void *, int);
@@ -116,7 +116,6 @@ struct shdma_dev {
 
 int shdma_request_irq(struct shdma_chan *, int,
 			   unsigned long, const char *);
-void shdma_free_irq(struct shdma_chan *);
 bool shdma_reset(struct shdma_dev *sdev);
 void shdma_chan_probe(struct shdma_dev *sdev,
 			   struct shdma_chan *schan, int id);