mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-28 22:54:05 +08:00
dma: rcar-audmapp: add DT support
This patch adds DT support to Audio DMAC peri peri driver. Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> [horms+renesas@verge.net.au: Do not add trailing blank line to rcar-audmapp.txt] [horms+renesas@verge.net.au: squashed patch to add NULL terminater to audmapp_of_match] Signed-off-by: Simon Horman <horms+renesas@verge.net.au> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Kuninori Morimoto
Simon Horman
parent
75bfa5f60a
commit
caf18c27dd
29
Documentation/devicetree/bindings/dma/rcar-audmapp.txt
Normal file
29
Documentation/devicetree/bindings/dma/rcar-audmapp.txt
Normal file
@ -0,0 +1,29 @@
|
||||
* 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@0xec740000 {
|
||||
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";
|
||||
@ -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 +353,18 @@ 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);
|
||||
|
||||
Loading…
Reference in New Issue
Block a user