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Date: Wed, 18 Jun 2014 01:59:44 -0700 (PDT)
From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To: Vinod Koul <vinod.koul@...el.com>
Cc: Linux-SH <linux-sh@...r.kernel.org>, linux-kernel@...r.kernel.org,
kuninori.morimoto.gx@...il.com
Subject: [PATCH 3/3] dma: rcar-audmapp: add DT support
From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
This patch adds DT support to Audio DMAC peri peri driver.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
---
.../devicetree/bindings/dma/rcar-audmapp.txt | 30 +++++++++
drivers/dma/sh/rcar-audmapp.c | 71 ++++++++++++++++----
2 files changed, 87 insertions(+), 14 deletions(-)
create mode 100644 Documentation/devicetree/bindings/dma/rcar-audmapp.txt
diff --git a/Documentation/devicetree/bindings/dma/rcar-audmapp.txt b/Documentation/devicetree/bindings/dma/rcar-audmapp.txt
new file mode 100644
index 0000000..b4950c4
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/rcar-audmapp.txt
@@ -0,0 +1,30 @@
+* R-Car Audio DMAC peri peri Device Tree bindings
+
+Required properties:
+- compatible: should be "renesas,rcar-audmapp"
+- #dma-cells: should be <1>, see "dmas" property below
+
+Example:
+ audmapp: audio-dma-pp@...c740000 {
+ compatible = "renesas,rcar-audmapp";
+ #dma-cells = <1>;
+
+ reg = <0 0xec740000 0 0x200>;
+ };
+
+
+* DMA client
+
+Required properties:
+- dmas: a list of <[DMA multiplexer phandle] [SRS/DRS value]> pairs,
+ where SRS/DRS values are fixed handles, specified in the SoC
+ manual as the value that would be written into the PDMACHCR.
+- dma-names: a list of DMA channel names, one per "dmas" entry
+
+Example:
+
+ dmas = <&audmapp 0x2d00
+ &audmapp 0x3700>;
+ dma-names = "src0_ssiu0",
+ "dvc0_ssiu0";
+
diff --git a/drivers/dma/sh/rcar-audmapp.c b/drivers/dma/sh/rcar-audmapp.c
index dd00775..0774c36 100644
--- a/drivers/dma/sh/rcar-audmapp.c
+++ b/drivers/dma/sh/rcar-audmapp.c
@@ -22,6 +22,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/dmaengine.h>
+#include <linux/of_dma.h>
#include <linux/platform_data/dma-rcar-audmapp.h>
#include <linux/platform_device.h>
#include <linux/shdma-base.h>
@@ -63,6 +64,8 @@ struct audmapp_desc {
dma_addr_t dst;
};
+#define to_shdma_chan(c) container_of(c, struct shdma_chan, dma_chan)
+
#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
#define to_desc(sdesc) container_of(sdesc, struct audmapp_desc, shdma_desc)
#define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device, \
@@ -114,38 +117,50 @@ static void audmapp_start_xfer(struct shdma_chan *schan,
audmapp_write(auchan, chcr, PDMACHCR);
}
-static struct audmapp_slave_config *
-audmapp_find_slave(struct audmapp_chan *auchan, int slave_id)
+static void audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
+ u32 *chcr, 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;
+ return;
+ }
+
+ /* non-DT */
+
if (slave_id >= AUDMAPP_SLAVE_NUMBER)
- return NULL;
+ return;
for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
- if (cfg->slave_id == slave_id)
- return cfg;
-
- return NULL;
+ if (cfg->slave_id == slave_id) {
+ *chcr = cfg->chcr;
+ *dst = cfg->dst;
+ break;
+ }
}
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);
- struct audmapp_slave_config *cfg =
- audmapp_find_slave(auchan, slave_id);
+ u32 chcr;
+ dma_addr_t dst;
+
+ audmapp_get_config(auchan, slave_id, &chcr, &dst);
- if (!cfg)
- return -ENODEV;
if (try)
return 0;
- auchan->chcr = cfg->chcr;
- auchan->slave_addr = slave_addr ? : cfg->dst;
+ auchan->chcr = chcr;
+ auchan->slave_addr = slave_addr ? : dst;
return 0;
}
@@ -244,16 +259,39 @@ static void audmapp_chan_remove(struct audmapp_device *audev)
dma_dev->chancnt = 0;
}
+static struct dma_chan *audmapp_of_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ dma_cap_mask_t mask;
+ struct dma_chan *chan;
+ u32 chcr = dma_spec->args[0];
+
+ if (dma_spec->args_count != 1)
+ return NULL;
+
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ chan = dma_request_channel(mask, shdma_chan_filter, NULL);
+ if (chan)
+ to_shdma_chan(chan)->hw_req = chcr;
+
+ return chan;
+}
+
static int audmapp_probe(struct platform_device *pdev)
{
struct audmapp_pdata *pdata = pdev->dev.platform_data;
+ struct device_node *np = pdev->dev.of_node;
struct audmapp_device *audev;
struct shdma_dev *sdev;
struct dma_device *dma_dev;
struct resource *res;
int err, i;
- if (!pdata)
+ if (np)
+ of_dma_controller_register(np, audmapp_of_xlate, pdev);
+ else if (!pdata)
return -ENODEV;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -315,12 +353,17 @@ static int audmapp_remove(struct platform_device *pdev)
return 0;
}
+static const struct of_device_id audmapp_of_match[] = {
+ { .compatible = "renesas,rcar-audmapp", },
+};
+
static struct platform_driver audmapp_driver = {
.probe = audmapp_probe,
.remove = audmapp_remove,
.driver = {
.owner = THIS_MODULE,
.name = "rcar-audmapp-engine",
+ .of_match_table = audmapp_of_match,
},
};
module_platform_driver(audmapp_driver);
--
1.7.9.5
--
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