[PATCH 1/3 v2][RFC] dmaengine: rcar-audmapp: calculate chcr via src/dst addr

[Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>]

Current rcar-audmapp is assuming that CHCR value are specified
from platform data or DTS bindings. but, it is possible to
calculate CHCR settings from src/dst address.
DTS bindings node can be reduced by this patch.

For this update, new rcar-audmapp assumes DT has SSIU/DTCP/MLM/SCU
register entry.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
---
v1 -> v2

 - it assums DT has SSIU/DTCP/MLM/SCU reg on DT

 drivers/dma/sh/rcar-audmapp.c |  164 ++++++++++++++++++++++++++++++++++++++---
 1 file changed, 152 insertions(+), 12 deletions(-)

diff --git a/drivers/dma/sh/rcar-audmapp.c b/drivers/dma/sh/rcar-audmapp.c
index d95bbdd..be45a93 100644
--- a/drivers/dma/sh/rcar-audmapp.c
+++ b/drivers/dma/sh/rcar-audmapp.c
@@ -44,11 +44,19 @@
 #define AUDMAPP_SLAVE_NUMBER	256
 #define AUDMAPP_LEN_MAX		(16 * 1024 * 1024)
 
+enum AUDMAPP_TGT_ADDR {
+	AUDMAPP_TGT_SSIU = 0,
+	AUDMAPP_TGT_DTCP,
+	AUDMAPP_TGT_MLM,
+	AUDMAPP_TGT_SCU,
+
+	AUDMAPP_TGT_MAX,
+};
+
 struct audmapp_chan {
 	struct shdma_chan shdma_chan;
 	void __iomem *base;
 	dma_addr_t slave_addr;
-	u32 chcr;
 };
 
 struct audmapp_device {
@@ -56,6 +64,7 @@ struct audmapp_device {
 	struct audmapp_pdata *pdata;
 	struct device *dev;
 	void __iomem *chan_reg;
+	resource_size_t tgt_addr[AUDMAPP_TGT_MAX];
 };
 
 struct audmapp_desc {
@@ -100,6 +109,129 @@ static void audmapp_halt(struct shdma_chan *schan)
 	}
 }
 
+struct id_addr_table {
+	u8  id;
+	u16 addr;
+};
+
+static u32 audmapp_addr_to_id(struct audmapp_device *audev, u32 addr)
+{
+	static const struct id_addr_table ssi_id_table[] = {
+		{0x00, 0x0000}, /* SSI00 */
+		{0x01, 0x0400}, /* SSI01 */
+		{0x02, 0x0800}, /* SSI02 */
+		{0x03, 0x0C00}, /* SSI03 */
+		{0x04, 0x1000}, /* SSI10 */
+		{0x05, 0x1400}, /* SSI11 */
+		{0x06, 0x1800}, /* SSI12 */
+		{0x07, 0x1C00}, /* SSI13 */
+		{0x08, 0x2000}, /* SSI20 */
+		{0x09, 0x2400}, /* SSI21 */
+		{0x0a, 0x2800}, /* SSI22 */
+		{0x0b, 0x2C00}, /* SSI23 */
+		{0x0c, 0x3000}, /* SSI3  */
+		{0x0d, 0x4000}, /* SSI4  */
+		{0x0e, 0x5000}, /* SSI5  */
+		{0x0f, 0x6000}, /* SSI6  */
+		{0x10, 0x7000}, /* SSI7  */
+		{0x11, 0x8000}, /* SSI8  */
+		{0x12, 0x9000}, /* SSI90 */
+		{0x13, 0x9400}, /* SSI91 */
+		{0x14, 0x9800}, /* SSI92 */
+		{0x15, 0x9C00}, /* SSI93 */
+	};
+	static const struct id_addr_table dtcp_id_tabel[] = {
+		{0x16, 0x0000}, /* DTCPPP0 */
+		{0x17, 0x0400}, /* DTCPPP1 */
+		{0x18, 0x4000}, /* DTCPCP0 */
+		{0x19, 0x4400}, /* DTCPCP1 */
+	};
+	static const struct id_addr_table mlm_id_table[] = {
+		{0x25, 0x0000}, /* MLM0 */
+		{0x26, 0x0400}, /* MLM1 */
+		{0x27, 0x0800}, /* MLM2 */
+		{0x28, 0x0C00}, /* MLM3 */
+		{0x29, 0x1000}, /* MLM4 */
+		{0x2a, 0x1400}, /* MLM5 */
+		{0x2b, 0x1800}, /* MLM6 */
+		{0x2c, 0x1C00}, /* MLM7 */
+	};
+	static const struct id_addr_table scu_id_table[] = {
+		{0x2d, 0x0000}, /* SCU_SRCI0 */
+		{0x2e, 0x0400}, /* SCU_SRCI1 */
+		{0x2f, 0x0800}, /* SCU_SRCI2 */
+		{0x30, 0x0C00}, /* SCU_SRCI3 */
+		{0x31, 0x1000}, /* SCU_SRCI4 */
+		{0x32, 0x1400}, /* SCU_SRCI5 */
+		{0x33, 0x1800}, /* SCU_SRCI6 */
+		{0x34, 0x1C00}, /* SCU_SRCI7 */
+		{0x35, 0x2000}, /* SCU_SRCI8 */
+		{0x36, 0x2400}, /* SCU_SRCI9 */
+
+		{0x2d, 0x4000}, /* SCU_SRCO0 */
+		{0x2e, 0x4400}, /* SCU_SRCO1 */
+		{0x2f, 0x4800}, /* SCU_SRCO2 */
+		{0x30, 0x4C00}, /* SCU_SRCO3 */
+		{0x31, 0x5000}, /* SCU_SRCO4 */
+		{0x32, 0x5400}, /* SCU_SRCO5 */
+		{0x33, 0x5800}, /* SCU_SRCO6 */
+		{0x34, 0x5C00}, /* SCU_SRCO7 */
+		{0x35, 0x6000}, /* SCU_SRCO8 */
+		{0x36, 0x6400}, /* SCU_SRCO9 */
+		{0x37, 0x8000}, /* SCU_CMD0 */
+		{0x38, 0x8400}, /* SCU_CMD1 */
+	};
+	const struct id_addr_table *table;
+	struct device *dev = audev->dev;
+	int size;
+	int i;
+
+	table = NULL;
+	size = 0;
+	for (i = 0; i < AUDMAPP_TGT_MAX; i++) {
+		if ((addr & 0xFFFF0000) != audev->tgt_addr[i])
+			continue;
+
+		switch (i) {
+		case AUDMAPP_TGT_SSIU:
+			table = ssi_id_table;
+			size = ARRAY_SIZE(ssi_id_table);
+			break;
+		case AUDMAPP_TGT_DTCP:
+			table = dtcp_id_tabel;
+			size = ARRAY_SIZE(dtcp_id_tabel);
+			break;
+		case AUDMAPP_TGT_MLM:
+			table = mlm_id_table;
+			size = ARRAY_SIZE(mlm_id_table);
+			break;
+		case AUDMAPP_TGT_SCU:
+			table = scu_id_table;
+			size = ARRAY_SIZE(scu_id_table);
+			break;
+		}
+	}
+
+	for (i = 0; i < size; i++) {
+		if (table[i].addr = (addr & 0xFFFF))
+			return table[i].id;
+	}
+
+	dev_err(dev, "unknown addr (%x)\n", addr);
+
+	return 0xFF;
+}
+
+static u32 audmapp_get_chcr(struct audmapp_device *audev, struct audmapp_desc *desc)
+{
+	u32 src_id, dst_id;
+
+	src_id = audmapp_addr_to_id(audev, desc->src);
+	dst_id = audmapp_addr_to_id(audev, desc->dst);
+
+	return src_id << 24 | dst_id << 16;
+}
+
 static void audmapp_start_xfer(struct shdma_chan *schan,
 			       struct shdma_desc *sdesc)
 {
@@ -107,7 +239,7 @@ static void audmapp_start_xfer(struct shdma_chan *schan,
 	struct audmapp_device *audev = to_dev(auchan);
 	struct audmapp_desc *desc = to_desc(sdesc);
 	struct device *dev = audev->dev;
-	u32 chcr = auchan->chcr | PDMACHCR_DE;
+	u32 chcr = audmapp_get_chcr(audev, desc) | PDMACHCR_DE;
 
 	dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n",
 		&desc->src, &desc->dst, chcr);
@@ -118,19 +250,17 @@ static void audmapp_start_xfer(struct shdma_chan *schan,
 }
 
 static int audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
-			      u32 *chcr, dma_addr_t *dst)
+			      dma_addr_t *dst)
 {
 	struct audmapp_device *audev = to_dev(auchan);
 	struct audmapp_pdata *pdata = audev->pdata;
 	struct audmapp_slave_config *cfg;
 	int i;
 
-	*chcr	= 0;
 	*dst	= 0;
 
 	if (!pdata) { /* DT */
-		*chcr = ((u32)slave_id) << 16;
-		auchan->shdma_chan.slave_id = (slave_id) >> 8;
+		auchan->shdma_chan.slave_id = slave_id;
 		return 0;
 	}
 
@@ -141,7 +271,6 @@ static int audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
 
 	for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
 		if (cfg->slave_id = slave_id) {
-			*chcr	= cfg->chcr;
 			*dst	= cfg->dst;
 			return 0;
 		}
@@ -153,18 +282,16 @@ static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
 			     dma_addr_t slave_addr, bool try)
 {
 	struct audmapp_chan *auchan = to_chan(schan);
-	u32 chcr;
 	dma_addr_t dst;
 	int ret;
 
-	ret = audmapp_get_config(auchan, slave_id, &chcr, &dst);
+	ret = audmapp_get_config(auchan, slave_id, &dst);
 	if (ret < 0)
 		return ret;
 
 	if (try)
 		return 0;
 
-	auchan->chcr		= chcr;
 	auchan->slave_addr	= slave_addr ? : dst;
 
 	return 0;
@@ -267,7 +394,7 @@ static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
 {
 	dma_cap_mask_t mask;
 	struct dma_chan *chan;
-	u32 chcr = dma_spec->args[0];
+	u32 id = dma_spec->args[0];
 
 	if (dma_spec->args_count != 1)
 		return NULL;
@@ -277,7 +404,7 @@ static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
 
 	chan = dma_request_channel(mask, shdma_chan_filter, NULL);
 	if (chan)
-		to_shdma_chan(chan)->hw_req = chcr;
+		to_shdma_chan(chan)->hw_req = id;
 
 	return chan;
 }
@@ -290,6 +417,7 @@ static int audmapp_probe(struct platform_device *pdev)
 	struct shdma_dev *sdev;
 	struct dma_device *dma_dev;
 	struct resource *res;
+	struct device *dev = &pdev->dev;
 	int err, i;
 
 	if (np)
@@ -309,6 +437,18 @@ static int audmapp_probe(struct platform_device *pdev)
 	if (IS_ERR(audev->chan_reg))
 		return PTR_ERR(audev->chan_reg);
 
+	for (i = 0; i < AUDMAPP_TGT_MAX; i++) {
+		res = platform_get_resource(pdev, IORESOURCE_MEM, i + 1);
+		if (!res)
+			return -ENODEV;
+
+		if (!devm_request_mem_region(dev, res->start, resource_size(res),
+					dev_name(dev)))
+			return -EIO;
+
+		audev->tgt_addr[i] = res->start;
+	}
+
 	sdev		= &audev->shdma_dev;
 	sdev->ops	= &audmapp_shdma_ops;
 	sdev->desc_size	= sizeof(struct audmapp_desc);
-- 
1.7.9.5