openwrtv3/target/linux/omap/patches-3.12/402-ASoC-davinci-mcasp-Add-DMA-register-locations-to-DT.patch

From fb2002dbc326d2e408698038b668b19741567a48 Mon Sep 17 00:00:00 2001
From: Jyri Sarha <jsarha@ti.com>
Date: Fri, 6 Sep 2013 12:15:00 +0300
Subject: [PATCH 213/752] ASoC: davinci-mcasp: Add DMA register locations to
 DT

This patch adds DMA register location to mcasp DT bindings. On am33xx
SoCs the McASP registers are mapped trough L4 interconnect, which is
not accessible by the DMA controller, so McASP data port is mapped
trough L3 to a different location.

Signed-off-by: Hebbar, Gururaja <gururaja.hebbar@ti.com>
Signed-off-by: Darren Etheridge <detheridge@ti.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
---
 .../bindings/sound/davinci-mcasp-audio.txt         |    8 ++-
 sound/soc/davinci/davinci-mcasp.c                  |   59 +++++++++++++-------
 2 files changed, 46 insertions(+), 21 deletions(-)

--- a/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
+++ b/Documentation/devicetree/bindings/sound/davinci-mcasp-audio.txt
@@ -6,7 +6,11 @@ Required properties:
 	"ti,da830-mcasp-audio"	: for both DA830 & DA850 platforms
 	"ti,omap2-mcasp-audio"	: for OMAP2 platforms (TI81xx, AM33xx)
 
-- reg : Should contain McASP registers offset and length
+- reg : Should contain McASP registers address and length for mpu and
+	optionally for dma controller access.
+- reg-names : The mandatory reg-range must be named "mpu" and the optional DMA
+	      reg-range must be named "dma". For backward compatibility it is
+	      good to keep "mpu" first in the list.
 - interrupts : Interrupt number for McASP
 - op-mode : I2S/DIT ops mode.
 - tdm-slots : Slots for TDM operation.
@@ -15,7 +19,6 @@ Required properties:
 		to "num-serializer" parameter. Each entry is a number indication
 		serializer pin direction. (0 - INACTIVE, 1 - TX, 2 - RX)
 
-
 Optional properties:
 
 - ti,hwmods : Must be "mcasp<n>", n is controller instance starting 0
@@ -31,6 +34,7 @@ mcasp0: mcasp0@1d00000 {
 	#address-cells = <1>;
 	#size-cells = <0>;
 	reg = <0x100000 0x3000>;
+	reg-names "mpu";
 	interrupts = <82 83>;
 	op-mode = <0>;		/* MCASP_IIS_MODE */
 	tdm-slots = <2>;
--- a/sound/soc/davinci/davinci-mcasp.c
+++ b/sound/soc/davinci/davinci-mcasp.c
@@ -1001,18 +1001,40 @@ static const struct snd_soc_component_dr
 	.name		= "davinci-mcasp",
 };
 
+/* Some HW specific values and defaults. The rest is filled in from DT. */
+static struct snd_platform_data dm646x_mcasp_pdata = {
+	.tx_dma_offset = 0x400,
+	.rx_dma_offset = 0x400,
+	.asp_chan_q = EVENTQ_0,
+	.version = MCASP_VERSION_1,
+};
+
+static struct snd_platform_data da830_mcasp_pdata = {
+	.tx_dma_offset = 0x2000,
+	.rx_dma_offset = 0x2000,
+	.asp_chan_q = EVENTQ_0,
+	.version = MCASP_VERSION_2,
+};
+
+static struct snd_platform_data omap2_mcasp_pdata = {
+	.tx_dma_offset = 0,
+	.rx_dma_offset = 0,
+	.asp_chan_q = EVENTQ_0,
+	.version = MCASP_VERSION_3,
+};
+
 static const struct of_device_id mcasp_dt_ids[] = {
 	{
 		.compatible = "ti,dm646x-mcasp-audio",
-		.data = (void *)MCASP_VERSION_1,
+		.data = &dm646x_mcasp_pdata,
 	},
 	{
 		.compatible = "ti,da830-mcasp-audio",
-		.data = (void *)MCASP_VERSION_2,
+		.data = &da830_mcasp_pdata,
 	},
 	{
 		.compatible = "ti,omap2-mcasp-audio",
-		.data = (void *)MCASP_VERSION_3,
+		.data = &omap2_mcasp_pdata,
 	},
 	{ /* sentinel */ }
 };
@@ -1035,20 +1057,13 @@ static struct snd_platform_data *davinci
 		pdata = pdev->dev.platform_data;
 		return pdata;
 	} else if (match) {
-		pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
-		if (!pdata) {
-			ret = -ENOMEM;
-			goto nodata;
-		}
+		pdata = (struct snd_platform_data *) match->data;
 	} else {
 		/* control shouldn't reach here. something is wrong */
 		ret = -EINVAL;
 		goto nodata;
 	}
 
-	if (match->data)
-		pdata->version = (u8)((int)match->data);
-
 	ret = of_property_read_u32(np, "op-mode", &val);
 	if (ret >= 0)
 		pdata->op_mode = val;
@@ -1145,10 +1160,15 @@ static int davinci_mcasp_probe(struct pl
 		return -EINVAL;
 	}
 
-	mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mpu");
 	if (!mem) {
-		dev_err(&pdev->dev, "no mem resource?\n");
-		return -ENODEV;
+		dev_warn(dev->dev,
+			 "\"mpu\" mem resource not found, using index 0\n");
+		mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+		if (!mem) {
+			dev_err(&pdev->dev, "no mem resource?\n");
+			return -ENODEV;
+		}
 	}
 
 	ioarea = devm_request_mem_region(&pdev->dev, mem->start,
@@ -1182,13 +1202,16 @@ static int davinci_mcasp_probe(struct pl
 	dev->rxnumevt = pdata->rxnumevt;
 	dev->dev = &pdev->dev;
 
+	dma = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dma");
+	if (!dma)
+		dma = mem;
+
 	dma_data = &dev->dma_params[SNDRV_PCM_STREAM_PLAYBACK];
 	dma_data->asp_chan_q = pdata->asp_chan_q;
 	dma_data->ram_chan_q = pdata->ram_chan_q;
 	dma_data->sram_pool = pdata->sram_pool;
 	dma_data->sram_size = pdata->sram_size_playback;
-	dma_data->dma_addr = (dma_addr_t) (pdata->tx_dma_offset +
-							mem->start);
+	dma_data->dma_addr = dma->start + pdata->tx_dma_offset;
 
 	/* first TX, then RX */
 	res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
@@ -1205,8 +1228,7 @@ static int davinci_mcasp_probe(struct pl
 	dma_data->ram_chan_q = pdata->ram_chan_q;
 	dma_data->sram_pool = pdata->sram_pool;
 	dma_data->sram_size = pdata->sram_size_capture;
-	dma_data->dma_addr = (dma_addr_t)(pdata->rx_dma_offset +
-							mem->start);
+	dma_data->dma_addr = dma->start + pdata->rx_dma_offset;
 
 	res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
 	if (!res) {
@@ -1266,4 +1288,3 @@ module_platform_driver(davinci_mcasp_dri
 MODULE_AUTHOR("Steve Chen");
 MODULE_DESCRIPTION("TI DAVINCI McASP SoC Interface");
 MODULE_LICENSE("GPL");
-