dmaengine: dw-edma: HDMA support

This patch series adds the HDMA support, as long the IP design has set the compatible register map parameter, which allows compatibility at some degree for the existing Synopsys DesignWare eDMA driver that is already available on the Kernel.

The HDMA "Hyper-DMA" IP is an enhancement of the eDMA "embedded-DMA" IP.

This new improvement comes with a PCI DVSEC that allows to the driver recognize and switch behavior if it's an eDMA or an HDMA, becoming retrocompatible, in the absence of this DVSEC, the driver will assume that is an eDMA IP.

It also adds the interleaved support, since it will be similar to the current scatter-gather implementation.

As well fixes/improves some abnormal behaviors not detected before, such as:
- crash on loading/unloading driver
- memory space definition for the data area and for the linked list space
- scatter-gather address calculation on 32 bits platforms
- minor comment and variable reordering

Changes:
V2: Applied changes based on Bjorn Helgaas' review
Rebased patches on top of v5.11-rc1 version
V3: Applied changes based on Lukas Wunner' review
V4: Fix a typo detected by kernel test robot
V5: Rework driver accordingly to Bjorn Helgaas's feedback
V6: Rework driver accordingly to Krzysztof Wilczyński's feedback
V7: Rework driver accordingly to Bjorn Helgaas's feedback
Rebased patches on top of Bjorn Helgaas next branch due to the support of PCI_VNDR_* defines

Gustavo Pimentel (15):
dmaengine: dw-edma: Add writeq() and readq() for 64 bits architectures
dmaengine: dw-edma: Fix comments offset characters' alignment
dmaengine: dw-edma: Add support for the HDMA feature
PCI: Add pci_find_vsec_capability() to find a specific VSEC
dmaengine: dw-edma: Add PCIe VSEC data retrieval support
dmaengine: dw-edma: Add device_prep_interleave_dma() support
dmaengine: dw-edma: Improve number of channels check
dmaengine: dw-edma: Reorder variables to keep consistency
dmaengine: dw-edma: Improve the linked list and data blocks definition
dmaengine: dw-edma: Change linked list and data blocks offset and
sizes
dmaengine: dw-edma: Move struct dentry variable from static definition
into dw_edma struct
dmaengine: dw-edma: Fix crash on loading/unloading driver
dmaengine: dw-edma: Change DMA abreviation from lower into upper case
dmaengine: dw-edma: Revert fix scatter-gather address calculation
dmaengine: dw-edma: Add pcim_iomap_table return check

 drivers/dma/dw-edma/dw-edma-core.c       | 178 +++++++++++-------
 drivers/dma/dw-edma/dw-edma-core.h       |  37 ++--
 drivers/dma/dw-edma/dw-edma-pcie.c       | 277 +++++++++++++++++++++-------
 drivers/dma/dw-edma/dw-edma-v0-core.c    | 300 ++++++++++++++++++++++++-------
 drivers/dma/dw-edma/dw-edma-v0-core.h    |   2 +-
 drivers/dma/dw-edma/dw-edma-v0-debugfs.c |  77 ++++----
 drivers/dma/dw-edma/dw-edma-v0-debugfs.h |   4 +-
 drivers/dma/dw-edma/dw-edma-v0-regs.h    | 291 +++++++++++++++++++-----------
 drivers/pci/pci.c                        |  30 ++++
 include/linux/pci.h                      |   1 +
 10 files changed, 842 insertions(+), 355 deletions(-)

2.7.4