[PATCH v2 0/3] ide: implement simple legacy/native mode switching for PCI IDE controllers

[Mark Cave-Ayland]

This series adds a simple implementation of legacy/native mode switching for PCI
IDE controllers and updates the via-ide device to use it.

The approach I take here is to add a new pci_ide_update_mode() function which 
handles
management of the PCI BARs and legacy IDE ioports for each mode to avoid 
exposing
details of the internal logic to individual PCI IDE controllers.

As noted in [1] this is extracted from a local WIP branch I have which contains
further work in this area. However for the moment I've kept it simple (and
restricted it to the via-ide device) which is good enough for Zoltan's PPC
images whilst paving the way for future improvements after 8.2.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>

[1] https://lists.gnu.org/archive/html/qemu-devel/2023-10/msg05403.html

v2:
- Rebase onto master
- Mask the bottom 4 bits of PCI_CLASS_PROG in pci_ide_update_mode() in patch 1
- Add patch 2 to remove the default BAR addresses to avoid confusion
- Don't set PCI_INTERRUPT_PIN directly in via_ide_reset() as it is already set
  by pci_ide_update_mode() in patch 3, and reword the commit message accordingly
- Add Tested-By tags from Zoltan and Bernhard


Mark Cave-Ayland (3):
  ide/pci.c: introduce pci_ide_update_mode() function
  ide/via: don't attempt to set default BAR addresses
  hw/ide/via: implement legacy/native mode switching

 hw/ide/pci.c         | 90 ++++++++++++++++++++++++++++++++++++++++++++
 hw/ide/via.c         | 25 ++++++++----
 include/hw/ide/pci.h |  1 +
 3 files changed, 109 insertions(+), 7 deletions(-)

-- 
2.39.2