Use the generic host bridge functions to provide support for PCI Express on arm64. There is no support for ISA memory.
Signed-off-by: Liviu Dudau Liviu.Dudau@arm.com
create mode 100644 arch/arm64/include/asm/pci.h create mode 100644 arch/arm64/kernel/pci.c
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 27bbcfc..d1c8568 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -62,7 +62,7 @@ config MMU def_bool y
config NO_IOPORT - def_bool y + def_bool y if !PCI
config STACKTRACE_SUPPORT def_bool y @@ -134,6 +134,23 @@ menu "Bus support" config ARM_AMBA bool
+config PCI + bool "PCI support" + help + This feature enables support for PCIe bus system. If you say Y + here, the kernel will include drivers and infrastructure code + to support PCIe bus devices. + +config PCI_DOMAINS + def_bool PCI + +config PCI_SYSCALL + def_bool PCI + +source "drivers/pci/Kconfig" +source "drivers/pci/pcie/Kconfig" +source "drivers/pci/hotplug/Kconfig" + endmenu
menu "Kernel Features" diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild index 71c53ec..46924bc 100644 --- a/arch/arm64/include/asm/Kbuild +++ b/arch/arm64/include/asm/Kbuild @@ -26,6 +26,7 @@ generic-y += mman.h generic-y += msgbuf.h generic-y += mutex.h generic-y += pci.h +generic-y += pci-bridge.h generic-y += poll.h generic-y += posix_types.h generic-y += resource.h diff --git a/arch/arm64/include/asm/io.h b/arch/arm64/include/asm/io.h index 7846a6b..67463a5 100644 --- a/arch/arm64/include/asm/io.h +++ b/arch/arm64/include/asm/io.h @@ -120,7 +120,8 @@ static inline u64 __raw_readq(const volatile void __iomem *addr) /* * I/O port access primitives. */ -#define IO_SPACE_LIMIT 0xffff +#define arch_has_dev_port() (1) +#define IO_SPACE_LIMIT 0x1ffffff #define PCI_IOBASE ((void __iomem *)(MODULES_VADDR - SZ_32M))
static inline u8 inb(unsigned long addr) diff --git a/arch/arm64/include/asm/pci.h b/arch/arm64/include/asm/pci.h new file mode 100644 index 0000000..6ed4092 --- /dev/null +++ b/arch/arm64/include/asm/pci.h @@ -0,0 +1,47 @@ +#ifndef __ASM_PCI_H +#define __ASM_PCI_H +#ifdef __KERNEL__ + +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/dma-mapping.h> + +#include <asm/io.h> +#include <asm-generic/pci-bridge.h> +#include <asm-generic/pci-dma-compat.h> + +#define PCIBIOS_MIN_IO 0x1000 +#define PCIBIOS_MIN_MEM 0 + +/* + * Set to 1 if the kernel should re-assign all PCI bus numbers + */ +#define pcibios_assign_all_busses() \ + (pci_has_flag(PCI_REASSIGN_ALL_BUS)) + +/* + * PCI address space differs from physical memory address space + */ +#define PCI_DMA_BUS_IS_PHYS (0) + +extern int isa_dma_bridge_buggy; + +static inline int pci_domain_nr(struct pci_bus *bus) +{ + struct pci_host_bridge *bridge = to_pci_host_bridge(bus->bridge); + + if (bridge) + return bridge->domain_nr; + + return 0; +} + +static inline int pci_proc_domain(struct pci_bus *bus) +{ + return 1; +} + +extern unsigned long pci_ioremap_io(const struct resource *res, phys_addr_t phys_addr); + +#endif /* __KERNEL__ */ +#endif /* __ASM_PCI_H */ diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index 2d4554b..64fc479 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -20,6 +20,7 @@ arm64-obj-$(CONFIG_HAVE_HW_BREAKPOINT)+= hw_breakpoint.o arm64-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o arm64-obj-$(CONFIG_ARM64_CPU_SUSPEND) += sleep.o suspend.o arm64-obj-$(CONFIG_JUMP_LABEL) += jump_label.o +arm64-obj-$(CONFIG_PCI) += pci.o
obj-y += $(arm64-obj-y) vdso/ obj-m += $(arm64-obj-m) diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c new file mode 100644 index 0000000..f00471d --- /dev/null +++ b/arch/arm64/kernel/pci.c @@ -0,0 +1,178 @@ +/* + * Code borrowed from powerpc/kernel/pci-common.c + * + * Copyright (C) 2003 Anton Blanchard anton@au.ibm.com, IBM + * Copyright (C) 2014 ARM Ltd. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + */ + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/kernel.h> +#include <linux/mm.h> +#include <linux/of_pci.h> +#include <linux/of_platform.h> +#include <linux/slab.h> + +#include <asm/pci-bridge.h> + +struct ioresource { + struct list_head list; + phys_addr_t start; + resource_size_t size; +}; + +static LIST_HEAD(io_list); + +int pci_register_io_range(phys_addr_t address, resource_size_t size) +{ + struct ioresource *res; + resource_size_t allocated_size = 0; + + /* find if the range has not been already allocated */ + list_for_each_entry(res, &io_list, list) { + if (address >= res->start && + address + size <= res->start + size) + return 0; + allocated_size += res->size; + } + + /* range not already registered, check for space */ + if (allocated_size + size > IO_SPACE_LIMIT) + return -E2BIG; + + /* add the range in the list */ + res = kzalloc(sizeof(*res), GFP_KERNEL); + if (!res) + return -ENOMEM; + res->start = address; + res->size = size; + + list_add_tail(&res->list, &io_list); + + return 0; +} +EXPORT_SYMBOL_GPL(pci_register_io_range); + +unsigned long pci_address_to_pio(phys_addr_t address) +{ + struct ioresource *res; + + list_for_each_entry(res, &io_list, list) { + if (address >= res->start && + address < res->start + res->size) { + return res->start - address; + } + } + + return (unsigned long)-1; +} +EXPORT_SYMBOL_GPL(pci_address_to_pio); + +/* + * Called after each bus is probed, but before its children are examined + */ +void pcibios_fixup_bus(struct pci_bus *bus) +{ + struct pci_dev *dev; + struct resource *res; + int i; + + if (!pci_is_root_bus(bus)) { + pci_read_bridge_bases(bus); + + pci_bus_for_each_resource(bus, res, i) { + if (!res || !res->flags || res->parent) + continue; + + /* + * If we are going to reassign everything, we can + * shrink the P2P resource to have zero size to + * save space + */ + if (pci_has_flag(PCI_REASSIGN_ALL_RSRC)) { + res->flags |= IORESOURCE_UNSET; + res->start = 0; + res->end = -1; + continue; + } + } + } + + list_for_each_entry(dev, &bus->devices, bus_list) { + /* Ignore fully discovered devices */ + if (dev->is_added) + continue; + + set_dev_node(&dev->dev, pcibus_to_node(dev->bus)); + + /* Read default IRQs and fixup if necessary */ + dev->irq = of_irq_parse_and_map_pci(dev, 0, 0); + } +} +EXPORT_SYMBOL(pcibios_fixup_bus); + +/* + * We don't have to worry about legacy ISA devices, so nothing to do here + */ +resource_size_t pcibios_align_resource(void *data, const struct resource *res, + resource_size_t size, resource_size_t align) +{ + return ALIGN(res->start, align); +} +EXPORT_SYMBOL(pcibios_align_resource); + +int pcibios_enable_device(struct pci_dev *dev, int mask) +{ + return pci_enable_resources(dev, mask); +} + +void pcibios_fixup_bridge_ranges(struct list_head *resources) +{ +} + +#define IO_SPACE_PAGES ((IO_SPACE_LIMIT + 1) / PAGE_SIZE) +static DECLARE_BITMAP(pci_iospace, IO_SPACE_PAGES); + +unsigned long pci_ioremap_io(const struct resource *res, phys_addr_t phys_addr) +{ + unsigned long start, len, virt_start; + int err; + + if (res->end > IO_SPACE_LIMIT) + return -EINVAL; + + /* + * try finding free space for the whole size first, + * fall back to 64K if not available + */ + len = resource_size(res); + start = bitmap_find_next_zero_area(pci_iospace, IO_SPACE_PAGES, + res->start / PAGE_SIZE, len / PAGE_SIZE, 0); + if (start == IO_SPACE_PAGES && len > SZ_64K) { + len = SZ_64K; + start = 0; + start = bitmap_find_next_zero_area(pci_iospace, IO_SPACE_PAGES, + start, len / PAGE_SIZE, 0); + } + + /* no 64K area found */ + if (start == IO_SPACE_PAGES) + return -ENOMEM; + + /* ioremap physical aperture to virtual aperture */ + virt_start = start * PAGE_SIZE + (unsigned long)PCI_IOBASE; + err = ioremap_page_range(virt_start, virt_start + len, + phys_addr, __pgprot(PROT_DEVICE_nGnRE)); + if (err) + return err; + + bitmap_set(pci_iospace, start, len / PAGE_SIZE); + + /* return io_offset */ + return start * PAGE_SIZE - res->start; +}