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dw_dmac: add ACPI support 

Since we have proper ACPI DMA helpers implemented, the driver may use it. This
patch introduces custom filter function together with acpi_device_id table.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Andy Shevchenko 2013-04-09 14:05:46 +03:00 committed by Vinod Koul
parent 4e82f5ddd1
commit 42c91ee71d
2 changed files with 50 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

68
drivers/dma/dw_dmac.c
View File

@ -25,6 +25,8 @@
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/acpi_dma.h>
#include "dw_dmac_regs.h"
#include "dmaengine.h"
@ -983,13 +985,6 @@ static inline void convert_burst(u32 *maxburst)
*maxburst = 0;
}
static inline void convert_slave_id(struct dw_dma_chan *dwc)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
dwc->dma_sconfig.slave_id -= dw->request_line_base;
}
static int
set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
{
@ -1008,7 +1003,6 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig)
convert_burst(&dwc->dma_sconfig.src_maxburst);
convert_burst(&dwc->dma_sconfig.dst_maxburst);
convert_slave_id(dwc);
return 0;
}
@ -1284,6 +1278,46 @@ static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
return dma_request_channel(cap, dw_dma_of_filter, &fargs);
}
#ifdef CONFIG_ACPI
static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
struct acpi_dma_spec *dma_spec = param;
if (chan->device->dev != dma_spec->dev ||
chan->chan_id != dma_spec->chan_id)
return false;
dwc->request_line = dma_spec->slave_id;
dwc->src_master = dwc_get_sms(NULL);
dwc->dst_master = dwc_get_dms(NULL);
return true;
}
static void dw_dma_acpi_controller_register(struct dw_dma *dw)
{
struct device *dev = dw->dma.dev;
struct acpi_dma_filter_info *info;
int ret;
info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
if (!info)
return;
dma_cap_zero(info->dma_cap);
dma_cap_set(DMA_SLAVE, info->dma_cap);
info->filter_fn = dw_dma_acpi_filter;
ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
info);
if (ret)
dev_err(dev, "could not register acpi_dma_controller\n");
}
#else /* !CONFIG_ACPI */
static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
#endif /* !CONFIG_ACPI */
/* --------------------- Cyclic DMA API extensions -------------------- */
/**
@ -1620,7 +1654,6 @@ dw_dma_parse_dt(struct platform_device *pdev)
static int dw_probe(struct platform_device *pdev)
{
const struct platform_device_id *match;
struct dw_dma_platform_data *pdata;
struct resource *io;
struct dw_dma *dw;
@ -1704,11 +1737,6 @@ static int dw_probe(struct platform_device *pdev)
memcpy(dw->data_width, pdata->data_width, 4);
}
/* Get the base request line if set */
match = platform_get_device_id(pdev);
if (match)
dw->request_line_base = (unsigned int)match->driver_data;
/* Calculate all channel mask before DMA setup */
dw->all_chan_mask = (1 << nr_channels) - 1;
@ -1833,6 +1861,9 @@ static int dw_probe(struct platform_device *pdev)
"could not register of_dma_controller\n");
}
if (ACPI_HANDLE(&pdev->dev))
dw_dma_acpi_controller_register(dw);
return 0;
}
@ -1904,11 +1935,12 @@ static const struct of_device_id dw_dma_of_id_table[] = {
MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
#endif
static const struct platform_device_id dw_dma_ids[] = {
/* Name, Request Line Base */
{ "INTL9C60", (kernel_ulong_t)16 },
#ifdef CONFIG_ACPI
static const struct acpi_device_id dw_dma_acpi_id_table[] = {
{ "INTL9C60", 0 },
{ }
};
#endif
static struct platform_driver dw_driver = {
.probe = dw_probe,
@ -1918,8 +1950,8 @@ static struct platform_driver dw_driver = {
.name = "dw_dmac",
.pm = &dw_dev_pm_ops,
.of_match_table = of_match_ptr(dw_dma_of_id_table),
.acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
},
.id_table = dw_dma_ids,
};
static int __init dw_init(void)

1
drivers/dma/dw_dmac_regs.h
View File

@ -250,7 +250,6 @@ struct dw_dma {
/* hardware configuration */
unsigned char nr_masters;
unsigned char data_width[4];
unsigned int request_line_base;
struct dw_dma_chan chan[0];
};