From: Pali Rohár Date: Tue, 4 Jan 2022 15:35:22 +0000 (+0100) Subject: PCI: pci-bridge-emul: Add support for new flag PCI_BRIDGE_EMUL_NO_IO_FORWARD X-Git-Tag: v6.1-rc5~1724^2~4^2~18 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=05241c13655c43116ea7322a6edffc47d7218550;p=platform%2Fkernel%2Flinux-starfive.git PCI: pci-bridge-emul: Add support for new flag PCI_BRIDGE_EMUL_NO_IO_FORWARD Like PCI_BRIDGE_EMUL_NO_PREFMEM_FORWARD, this new flag specifies that emulated PCI bridge does not support forwarding of IO requests in given range between primary and secondary buses. This flag should be used as argument for pci_bridge_emul_init() for hardware setup without IO support. Setting this flag cause that IO base and limit registers are read-only. Link: https://lore.kernel.org/r/20220104153529.31647-5-pali@kernel.org Signed-off-by: Pali Rohár Signed-off-by: Lorenzo Pieralisi Reviewed-by: Rob Herring --- diff --git a/drivers/pci/pci-bridge-emul.c b/drivers/pci/pci-bridge-emul.c index ceacba0..a16f9e3 100644 --- a/drivers/pci/pci-bridge-emul.c +++ b/drivers/pci/pci-bridge-emul.c @@ -382,6 +382,15 @@ int pci_bridge_emul_init(struct pci_bridge_emul *bridge, bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].rw = 0; } + if (flags & PCI_BRIDGE_EMUL_NO_IO_FORWARD) { + bridge->pci_regs_behavior[PCI_COMMAND / 4].ro |= PCI_COMMAND_IO; + bridge->pci_regs_behavior[PCI_COMMAND / 4].rw &= ~PCI_COMMAND_IO; + bridge->pci_regs_behavior[PCI_IO_BASE / 4].ro |= GENMASK(15, 0); + bridge->pci_regs_behavior[PCI_IO_BASE / 4].rw &= ~GENMASK(15, 0); + bridge->pci_regs_behavior[PCI_IO_BASE_UPPER16 / 4].ro = ~0; + bridge->pci_regs_behavior[PCI_IO_BASE_UPPER16 / 4].rw = 0; + } + return 0; } EXPORT_SYMBOL_GPL(pci_bridge_emul_init); diff --git a/drivers/pci/pci-bridge-emul.h b/drivers/pci/pci-bridge-emul.h index 087b5fa..4953274 100644 --- a/drivers/pci/pci-bridge-emul.h +++ b/drivers/pci/pci-bridge-emul.h @@ -125,6 +125,12 @@ enum { * requests between primary and secondary buses. */ PCI_BRIDGE_EMUL_NO_PREFMEM_FORWARD = BIT(0), + + /* + * PCI bridge does not support forwarding of IO requests between + * primary and secondary buses. + */ + PCI_BRIDGE_EMUL_NO_IO_FORWARD = BIT(1), }; int pci_bridge_emul_init(struct pci_bridge_emul *bridge,