@@ -16,6 +16,7 @@
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/of_dma.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -23,8 +24,6 @@
#include "dmaengine.h"
#include "virt-dma.h"
-#define JZ_DMA_NR_CHANNELS 32
-
/* Global registers. */
#define JZ_DMA_REG_DMAC 0x1000
#define JZ_DMA_REG_DIRQP 0x1004
@@ -135,14 +134,24 @@ struct jz4780_dma_chan {
unsigned int curr_hwdesc;
};
+enum jz_version {
+ ID_JZ4780,
+};
+
+struct jz4780_dma_soc_data {
+ unsigned int nb_channels;
+};
+
struct jz4780_dma_dev {
struct dma_device dma_device;
void __iomem *base;
struct clk *clk;
unsigned int irq;
+ enum jz_version version;
+ const struct jz4780_dma_soc_data *soc_data;
uint32_t chan_reserved;
- struct jz4780_dma_chan chan[JZ_DMA_NR_CHANNELS];
+ struct jz4780_dma_chan chan[];
};
struct jz4780_dma_filter_data {
@@ -648,7 +657,7 @@ static irqreturn_t jz4780_dma_irq_handler(int irq, void *data)
pending = jz4780_dma_readl(jzdma, JZ_DMA_REG_DIRQP);
- for (i = 0; i < JZ_DMA_NR_CHANNELS; i++) {
+ for (i = 0; i < jzdma->soc_data->nb_channels; i++) {
if (!(pending & (1<<i)))
continue;
@@ -728,7 +737,7 @@ static struct dma_chan *jz4780_of_dma_xlate(struct of_phandle_args *dma_spec,
data.channel = dma_spec->args[1];
if (data.channel > -1) {
- if (data.channel >= JZ_DMA_NR_CHANNELS) {
+ if (data.channel >= jzdma->soc_data->nb_channels) {
dev_err(jzdma->dma_device.dev,
"device requested non-existent channel %u\n",
data.channel);
@@ -752,13 +761,27 @@ static struct dma_chan *jz4780_of_dma_xlate(struct of_phandle_args *dma_spec,
}
}
+static const struct jz4780_dma_soc_data jz4780_dma_soc_data[] = {
+ [ID_JZ4780] = { .nb_channels = 32, },
+};
+
+static const struct of_device_id jz4780_dma_dt_match[] = {
+ { .compatible = "ingenic,jz4780-dma", .data = (void *)ID_JZ4780 },
+ {},
+};
+MODULE_DEVICE_TABLE(of, jz4780_dma_dt_match);
+
static int jz4780_dma_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
+ const struct of_device_id *of_id = of_match_device(
+ jz4780_dma_dt_match, dev);
+ const struct jz4780_dma_soc_data *soc_data;
struct jz4780_dma_dev *jzdma;
struct jz4780_dma_chan *jzchan;
struct dma_device *dd;
struct resource *res;
+ enum jz_version version;
int i, ret;
if (!dev->of_node) {
@@ -766,10 +789,18 @@ static int jz4780_dma_probe(struct platform_device *pdev)
return -EINVAL;
}
- jzdma = devm_kzalloc(dev, sizeof(*jzdma), GFP_KERNEL);
+ version = (enum jz_version)of_id->data;
+ soc_data = &jz4780_dma_soc_data[version];
+
+ jzdma = devm_kzalloc(dev, sizeof(*jzdma)
+ + sizeof(*jzdma->chan) * soc_data->nb_channels,
+ GFP_KERNEL);
if (!jzdma)
return -ENOMEM;
+ jzdma->soc_data = soc_data;
+ jzdma->version = version;
+
platform_set_drvdata(pdev, jzdma);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -844,7 +875,7 @@ static int jz4780_dma_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&dd->channels);
- for (i = 0; i < JZ_DMA_NR_CHANNELS; i++) {
+ for (i = 0; i < soc_data->nb_channels; i++) {
jzchan = &jzdma->chan[i];
jzchan->id = i;
@@ -889,19 +920,13 @@ static int jz4780_dma_remove(struct platform_device *pdev)
free_irq(jzdma->irq, jzdma);
- for (i = 0; i < JZ_DMA_NR_CHANNELS; i++)
+ for (i = 0; i < jzdma->soc_data->nb_channels; i++)
tasklet_kill(&jzdma->chan[i].vchan.task);
dma_async_device_unregister(&jzdma->dma_device);
return 0;
}
-static const struct of_device_id jz4780_dma_dt_match[] = {
- { .compatible = "ingenic,jz4780-dma", .data = NULL },
- {},
-};
-MODULE_DEVICE_TABLE(of, jz4780_dma_dt_match);
-
static struct platform_driver jz4780_dma_driver = {
.probe = jz4780_dma_probe,
.remove = jz4780_dma_remove,