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

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>

3 files changed, 12 insertions, 8 deletions

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index f238cfd33847..cd325866d9f4 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -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"
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index b3f3e90054f2..4e898121707b 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -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");
diff --git a/drivers/dma/fsldma.h b/drivers/dma/fsldma.h
index f5c38791fc74..1ffc24484d23 100644
--- a/drivers/dma/fsldma.h
+++ b/drivers/dma/fsldma.h
@@ -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 */