DMA: shdma: switch DT mode to use configuration data from a match table

This facilitates DMAC DT support by eliminating the need in AUXDATA and
avoiding creating complex DT data. This also fits well with DMAC devices,
of which SoCs often have multiple identical copies and it is perfectly
valid to use a single configuration data set for all of them.

Signed-off-by: Guennadi Liakhovetski <[email protected]>
Signed-off-by: Vinod Koul <[email protected]>

Author: lyakh

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/Makefile

@@ -1,3 +1,5 @@
 obj-$(CONFIG_SH_DMAE_BASE) += shdma-base.o shdma-of.o
 obj-$(CONFIG_SH_DMAE) += shdma.o
+shdma-y := shdmac.o
+shdma-objs := $(shdma-y)
 obj-$(CONFIG_SUDMAC) += sudmac.o

drivers/dma/sh/shdma-base.c

@@ -171,15 +171,16 @@ 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;
 	int ret, match;
 
 	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;

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 = pdev->dev.platform_data;
 	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.h

@@ -31,6 +31,7 @@ struct sh_dmae_chan {
 	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 {

drivers/dma/sh/shdma.c renamed to 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>
@@ -333,7 +335,7 @@ 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;
 			}
 	}
@@ -342,16 +344,18 @@ 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);
 	const struct sh_dmae_slave_config *cfg = dmae_find_slave(sh_chan, slave_id);
 	if (!cfg)
 		return -ENXIO;
 
-	if (!try)
+	if (!try) {
 		sh_chan->config = cfg;
+		sh_chan->slave_addr = slave_addr ? : cfg->addr;
+	}
 
 	return 0;
 }
@@ -641,7 +645,7 @@ 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)
@@ -663,9 +667,14 @@ 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[] = {
+	{}
+};
+MODULE_DEVICE_TABLE(of, sh_dmae_of_match);
+
 static int sh_dmae_probe(struct platform_device *pdev)
 {
-	const struct sh_dmae_pdata *pdata = pdev->dev.platform_data;
+	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];
@@ -674,6 +683,11 @@ 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 = pdev->dev.platform_data;
+
 	/* get platform data */
 	if (!pdata || !pdata->channel_num)
 		return -ENODEV;
@@ -902,12 +916,6 @@ static int sh_dmae_remove(struct platform_device *pdev)
 	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);

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);