Messages in this thread Patch in this message | | | From | Stafford Horne <> | Subject | [PATCH 1/2] openrisc: Add pci bus support | Date | Sun, 10 Jul 2022 06:15:48 +0900 |
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This patch adds required definitions to allow for PCI buses on OpenRISC. This is being in the QEMU virt platform.
OpenRISC does not have IO ports so this defines PCI IO to be allowed in any range. Keeping PIO_RESERVED defined as 0 allows OpenRISC to use MMIO for all IO.
Also, since commit 66bcd06099bb ("parport_pc: Also enable driver for PCI systems") all platforms that support PCI also need to support parallel port. We add a generic header to support parallel port drivers.
Signed-off-by: Stafford Horne <shorne@gmail.com> --- arch/openrisc/Kconfig | 7 ++++--- arch/openrisc/include/asm/Kbuild | 1 + arch/openrisc/include/asm/io.h | 4 ++-- arch/openrisc/include/asm/pci.h | 36 ++++++++++++++++++++++++++++++++ 4 files changed, 43 insertions(+), 5 deletions(-) create mode 100644 arch/openrisc/include/asm/pci.h
diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig index e814df4c483c..327241988819 100644 --- a/arch/openrisc/Kconfig +++ b/arch/openrisc/Kconfig @@ -21,7 +21,9 @@ config OPENRISC select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW select GENERIC_IOMAP + select GENERIC_PCI_IOMAP select GENERIC_CPU_DEVICES + select HAVE_PCI select HAVE_UID16 select GENERIC_ATOMIC64 select GENERIC_CLOCKEVENTS_BROADCAST @@ -32,6 +34,8 @@ config OPENRISC select CPU_NO_EFFICIENT_FFS if !OPENRISC_HAVE_INST_FF1 select ARCH_USE_QUEUED_RWLOCKS select OMPIC if SMP + select PCI_DOMAINS_GENERIC if PCI + select PCI_MSI if PCI select ARCH_WANT_FRAME_POINTERS select GENERIC_IRQ_MULTI_HANDLER select MMU_GATHER_NO_RANGE if MMU @@ -46,9 +50,6 @@ config MMU config GENERIC_HWEIGHT def_bool y -config NO_IOPORT_MAP - def_bool y - # For now, use generic checksum functions #These can be reimplemented in assembly later if so inclined config GENERIC_CSUM diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild index 3386b9c1c073..c8c99b554ca4 100644 --- a/arch/openrisc/include/asm/Kbuild +++ b/arch/openrisc/include/asm/Kbuild @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 generic-y += extable.h generic-y += kvm_para.h +generic-y += parport.h generic-y += spinlock_types.h generic-y += spinlock.h generic-y += qrwlock_types.h diff --git a/arch/openrisc/include/asm/io.h b/arch/openrisc/include/asm/io.h index c298061c70a7..1595aa69d96d 100644 --- a/arch/openrisc/include/asm/io.h +++ b/arch/openrisc/include/asm/io.h @@ -17,9 +17,9 @@ #include <linux/types.h> /* - * PCI: can we really do 0 here if we have no port IO? + * PCI: All address space can be used for IO */ -#define IO_SPACE_LIMIT 0 +#define IO_SPACE_LIMIT ~(0UL) /* OpenRISC has no port IO */ #define HAVE_ARCH_PIO_SIZE 1 diff --git a/arch/openrisc/include/asm/pci.h b/arch/openrisc/include/asm/pci.h new file mode 100644 index 000000000000..e0865d2f3f42 --- /dev/null +++ b/arch/openrisc/include/asm/pci.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#ifndef __ASM_OPENRISC_PCI_H +#define __ASM_OPENRISC_PCI_H + +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/dma-mapping.h> + +#include <asm/io.h> + +#define PCIBIOS_MIN_IO 0 +#define PCIBIOS_MIN_MEM 0 + +/* OpenRISC bootloaders do not initialize PCI bus */ +#define pcibios_assign_all_busses() 1 + +#define ARCH_GENERIC_PCI_MMAP_RESOURCE 1 + +extern int isa_dma_bridge_buggy; + +#ifdef CONFIG_PCI +static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel) +{ + /* no legacy IRQs on or1k */ + return -ENODEV; +} + +static inline int pci_proc_domain(struct pci_bus *bus) +{ + /* always show the domain in /proc */ + return 1; +} +#endif /* CONFIG_PCI */ + +#endif /* __ASM_OPENRISC_PCI_H */ -- 2.36.1
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