NXP Queue DMA controller(qDMA) on Layerscape SoCs supports channel
virtuallization by allowing DMA jobs to be enqueued into different
command queues.

Note that this module depends on NXP DPAA.

Signed-off-by: Wen He <redacted>
Signed-off-by: Jiaheng Fan <redacted>
---
change in v5:
        - Fixed the issues includes:
                * add error handler which every function
                * replace word to bit definition
                * move global variable to struct definition
                * add some comments to context

change in v4:
        - Fixed the issues that Vinod point out in the mail list.

change in v3:
        - Add 'depends on ARM || ARM64' in file 'drivers/dma/Kconfig'

change in v2:
        - Replace GPL V2 License details by SPDX tags
        - Replace Freescale by NXP
        - Reduce and optimize header file references
        - Replace big_endian by feature in struct fsl_qdma_engine
        - Replace struct fsl_qdma_format by struct fsl_qdma_ccdf
          and struct fsl_qdma_csgf
        - Remove empty line
        - Replace 'if..else' by macro 'FSL_QDMA_IN/OUT' in function
          qdma_readl() and qdma_writel()
        - Remove function fsl_qdma_alloc_chan_resources()
        - Replace 'prei' by 'pre'
        - Replace '-1' by '-ENOMEM' in function fsl_qdma_pre_request_enqueue_desc()
        - Fix dma pool allocation need to rolled back in function
          fsl_qdma_request_enqueue_desc()
        - Replace function of_property_read_u32_array() by device_property_read_u32_array()
        - Add functions fsl_qdma_cleanup_vchan() and fsl_qdma_irq_exit() to ensure
          irq and tasklets stopped
        - Replace dts node element 'channels' by 'dma-channels'
        - Replace function platform_driver_register() by module_platform_driver()

 drivers/dma/Kconfig    |   13 +
 drivers/dma/Makefile   |    1 +
 drivers/dma/fsl-qdma.c | 1101 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 1115 insertions(+), 0 deletions(-)
 create mode 100644 drivers/dma/fsl-qdma.c

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 6d61cd0..99aff33 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig

@@ -225,6 +225,19 @@ config FSL_EDMA
          multiplexing capability for DMA request sources(slot).
          This module can be found on Freescale Vybrid and LS-1 SoCs.

+config FSL_QDMA
+       tristate "NXP Layerscape qDMA engine support"
+       depends on ARM || ARM64
+       select DMA_ENGINE
+       select DMA_VIRTUAL_CHANNELS
+       select DMA_ENGINE_RAID
+       select ASYNC_TX_ENABLE_CHANNEL_SWITCH
+       help
+         Support the NXP Layerscape qDMA engine with command queue and legacy mode.
+         Channel virtualization is supported through enqueuing of DMA jobs to,
+         or dequeuing DMA jobs from, different work queues.
+         This module can be found on NXP Layerscape SoCs.
+
 config FSL_RAID
         tristate "Freescale RAID engine Support"
         depends on FSL_SOC && !ASYNC_TX_ENABLE_CHANNEL_SWITCH

diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 0f62a4d..93db0fc 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile

@@ -33,6 +33,7 @@ obj-$(CONFIG_DW_DMAC_CORE) += dw/
 obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
 obj-$(CONFIG_FSL_DMA) += fsldma.o
 obj-$(CONFIG_FSL_EDMA) += fsl-edma.o
+obj-$(CONFIG_FSL_QDMA) += fsl-qdma.o
 obj-$(CONFIG_FSL_RAID) += fsl_raid.o
 obj-$(CONFIG_HSU_DMA) += hsu/
 obj-$(CONFIG_IMG_MDC_DMA) += img-mdc-dma.o

diff --git a/drivers/dma/fsl-qdma.c b/drivers/dma/fsl-qdma.c
new file mode 100644
index 0000000..81df812
--- /dev/null
+++ b/drivers/dma/fsl-qdma.c

@@ -0,0 +1,1101 @@