Merge commit 'renesas-rcar-audmapp-for-v3.17' into for-linus

This commit is contained in:
Vinod Koul 2014-07-28 17:26:36 +05:30
commit db0e701819
2 changed files with 113 additions and 30 deletions
Documentation/devicetree/bindings/dma
drivers/dma/sh

View 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";

View File

@ -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>
@ -45,8 +46,9 @@
struct audmapp_chan {
struct shdma_chan shdma_chan;
struct audmapp_slave_config *config;
void __iomem *base;
dma_addr_t slave_addr;
u32 chcr;
};
struct audmapp_device {
@ -56,7 +58,16 @@ struct audmapp_device {
void __iomem *chan_reg;
};
struct audmapp_desc {
struct shdma_desc shdma_desc;
dma_addr_t src;
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, \
struct audmapp_device, shdma_dev.dma_dev)
@ -90,70 +101,82 @@ static void audmapp_halt(struct shdma_chan *schan)
}
static void audmapp_start_xfer(struct shdma_chan *schan,
struct shdma_desc *sdecs)
struct shdma_desc *sdesc)
{
struct audmapp_chan *auchan = to_chan(schan);
struct audmapp_device *audev = to_dev(auchan);
struct audmapp_slave_config *cfg = auchan->config;
struct audmapp_desc *desc = to_desc(sdesc);
struct device *dev = audev->dev;
u32 chcr = cfg->chcr | PDMACHCR_DE;
u32 chcr = auchan->chcr | PDMACHCR_DE;
dev_dbg(dev, "src/dst/chcr = %pad/%pad/%x\n",
&cfg->src, &cfg->dst, cfg->chcr);
dev_dbg(dev, "src/dst/chcr = %pad/%pad/%08x\n",
&desc->src, &desc->dst, chcr);
audmapp_write(auchan, cfg->src, PDMASAR);
audmapp_write(auchan, cfg->dst, PDMADAR);
audmapp_write(auchan, desc->src, PDMASAR);
audmapp_write(auchan, desc->dst, PDMADAR);
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->config = cfg;
auchan->chcr = chcr;
auchan->slave_addr = slave_addr ? : dst;
return 0;
}
static int audmapp_desc_setup(struct shdma_chan *schan,
struct shdma_desc *sdecs,
struct shdma_desc *sdesc,
dma_addr_t src, dma_addr_t dst, size_t *len)
{
struct audmapp_chan *auchan = to_chan(schan);
struct audmapp_slave_config *cfg = auchan->config;
if (!cfg)
return -ENODEV;
struct audmapp_desc *desc = to_desc(sdesc);
if (*len > (size_t)AUDMAPP_LEN_MAX)
*len = (size_t)AUDMAPP_LEN_MAX;
desc->src = src;
desc->dst = dst;
return 0;
}
@ -164,7 +187,9 @@ static void audmapp_setup_xfer(struct shdma_chan *schan,
static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan)
{
return 0; /* always fixed address */
struct audmapp_chan *auchan = to_chan(schan);
return auchan->slave_addr;
}
static bool audmapp_channel_busy(struct shdma_chan *schan)
@ -183,7 +208,7 @@ static bool audmapp_desc_completed(struct shdma_chan *schan,
static struct shdma_desc *audmapp_embedded_desc(void *buf, int i)
{
return &((struct shdma_desc *)buf)[i];
return &((struct audmapp_desc *)buf)[i].shdma_desc;
}
static const struct shdma_ops audmapp_shdma_ops = {
@ -234,16 +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);
@ -260,7 +308,7 @@ static int audmapp_probe(struct platform_device *pdev)
sdev = &audev->shdma_dev;
sdev->ops = &audmapp_shdma_ops;
sdev->desc_size = sizeof(struct shdma_desc);
sdev->desc_size = sizeof(struct audmapp_desc);
dma_dev = &sdev->dma_dev;
dma_dev->copy_align = LOG2_DEFAULT_XFER_SIZE;
@ -305,12 +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);