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DMA: Freescale: update driver to support 8-channel DMA engine

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This patch adds support to 8-channel DMA engine, thus the driver works for both
the new 8-channel and the legacy 4-channel DMA engines.

Signed-off-by: Hongbo Zhang <hongbo.zhang@freescale.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Hongbo Zhang 2013-09-26 17:33:43 +08:00 committed by Vinod Koul
parent 03aa254f1e
commit 8de7a7d950
3 changed files with 12 additions and 8 deletions
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9
drivers/dma/Kconfig
View file

@ -89,14 +89,15 @@ config AT_HDMAC
Support the Atmel AHB DMA controller.
config FSL_DMA
tristate "Freescale Elo and Elo Plus DMA support"
tristate "Freescale Elo series DMA support"
depends on FSL_SOC
select DMA_ENGINE
select ASYNC_TX_ENABLE_CHANNEL_SWITCH
---help---
Enable support for the Freescale Elo and Elo Plus DMA controllers.
The Elo is the DMA controller on some 82xx and 83xx parts, and the
Elo Plus is the DMA controller on 85xx and 86xx parts.
Enable support for the Freescale Elo series DMA controllers.
The Elo is the DMA controller on some mpc82xx and mpc83xx parts, the
EloPlus is on mpc85xx and mpc86xx and Pxxx parts, and the Elo3 is on
some Txxx and Bxxx parts.
config MPC512X_DMA
tristate "Freescale MPC512x built-in DMA engine support"

9
drivers/dma/fsldma.c
View file

@ -1253,7 +1253,9 @@ static int fsl_dma_chan_probe(struct fsldma_device *fdev,
WARN_ON(fdev->feature != chan->feature);
chan->dev = fdev->dev;
chan->id = ((res.start - 0x100) & 0xfff) >> 7;
chan->id = (res.start & 0xfff) < 0x300 ?
((res.start - 0x100) & 0xfff) >> 7 :
((res.start - 0x200) & 0xfff) >> 7;
if (chan->id >= FSL_DMA_MAX_CHANS_PER_DEVICE) {
dev_err(fdev->dev, "too many channels for device\n");
err = -EINVAL;
@ -1426,6 +1428,7 @@ static int fsldma_of_remove(struct platform_device *op)
}
static const struct of_device_id fsldma_of_ids[] = {
{ .compatible = "fsl,elo3-dma", },
{ .compatible = "fsl,eloplus-dma", },
{ .compatible = "fsl,elo-dma", },
{}
@ -1447,7 +1450,7 @@ static struct platform_driver fsldma_of_driver = {
static __init int fsldma_init(void)
{
pr_info("Freescale Elo / Elo Plus DMA driver\n");
pr_info("Freescale Elo series DMA driver\n");
return platform_driver_register(&fsldma_of_driver);
}
@ -1459,5 +1462,5 @@ static void __exit fsldma_exit(void)
subsys_initcall(fsldma_init);
module_exit(fsldma_exit);
MODULE_DESCRIPTION("Freescale Elo / Elo Plus DMA driver");
MODULE_DESCRIPTION("Freescale Elo series DMA driver");
MODULE_LICENSE("GPL");

2
drivers/dma/fsldma.h
View file

@ -112,7 +112,7 @@ struct fsldma_chan_regs {
};
struct fsldma_chan;
#define FSL_DMA_MAX_CHANS_PER_DEVICE 4
#define FSL_DMA_MAX_CHANS_PER_DEVICE 8
struct fsldma_device {
void __iomem *regs; /* DGSR register base */