dmaengine: dw-edma: Add per-channel interrupt routing control

DesignWare eDMA can signal completion locally through edma_int[] and
remotely through IMWr/MSI. When channels are delegated to a remote
frontend, the local endpoint side and the remote host side must not both
service the same DONE/ABORT status.

Add channel interrupt routing state and initialize it from the controller
instance configuration. Update the eDMA and HDMA native paths so
linked-list interrupt generation, HDMA non-linked-list interrupt enables,
and DONE/ABORT masking follow the selected mode. For HDMA native
non-linked-list channels, keep the local stop/abort enables set so status
is latched. In remote mode, also enable remote signaling and mask the local
interrupt pins.

Keep the existing dw-edma-pcie host-side instances in remote interrupt
routing mode so their IMWr/MSI completion model remains unchanged after
local routing becomes the zero value.

Note:
- The routing mode describes where a channel should report completion.
  It does not by itself say whether this dw-edma instance owns the
  interrupt status. A local instance must ignore remote-only channels,
  and a remote instance must ignore local-only channels, even if such
  interrupts are unexpectedly delivered. Otherwise the non-owner side
  could steal the interrupt from the owner by clearing shared DONE/ABORT
  status.

Cc: Devendra K Verma <devendra.verma@amd.com>
Suggested-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Koichiro Den <den@valinux.co.jp>
Link: https://patch.msgid.link/20260721062815.4117887-3-den@valinux.co.jp
Signed-off-by: Vinod Koul <vkoul@kernel.org>

0 files changed, 0 insertions, 0 deletions