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author | Rob Herring <rob.herring@calxeda.com> | 2012-03-01 00:10:58 (GMT) |
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committer | Rob Herring <rob.herring@calxeda.com> | 2012-07-25 14:26:42 (GMT) |
commit | c2794437091a4fda72c4a4f3567dd728dcc0c3c9 (patch) | |
tree | 56e4d414f5b78bdf35822b38af5be021711a0970 /arch/arm/include/asm | |
parent | 701eb2647d7986b42fa973990649a83b3e15e8eb (diff) | |
download | linux-fsl-qoriq-c2794437091a4fda72c4a4f3567dd728dcc0c3c9.tar.xz |
ARM: Add fixed PCI i/o mapping
This adds a fixed virtual mapping for PCI i/o addresses. The mapping is
located at the last 2MB of vmalloc region (0xfee00000-0xff000000). 2MB
is used to align with PMD size, but IO_SPACE_LIMIT is 1MB. The space
is reserved after .map_io and can be mapped at any time later with
pci_ioremap_io. Platforms which need early i/o mapping (e.g. for vga
console) can call pci_map_io_early in their .map_io function.
This has changed completely from the 1st implementation which only
supported creating the static mapping at .map_io.
Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Nicolas Pitre <nico@linaro.org>
Diffstat (limited to 'arch/arm/include/asm')
-rw-r--r-- | arch/arm/include/asm/io.h | 8 | ||||
-rw-r--r-- | arch/arm/include/asm/mach/map.h | 8 | ||||
-rw-r--r-- | arch/arm/include/asm/mach/pci.h | 10 |
3 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h index 815c669..8f4db67 100644 --- a/arch/arm/include/asm/io.h +++ b/arch/arm/include/asm/io.h @@ -113,11 +113,19 @@ static inline void __iomem *__typesafe_io(unsigned long addr) #define __iowmb() do { } while (0) #endif +/* PCI fixed i/o mapping */ +#define PCI_IO_VIRT_BASE 0xfee00000 + +extern int pci_ioremap_io(unsigned int offset, phys_addr_t phys_addr); + /* * Now, pick up the machine-defined IO definitions */ #ifdef CONFIG_NEED_MACH_IO_H #include <mach/io.h> +#elif defined(CONFIG_PCI) +#define IO_SPACE_LIMIT ((resource_size_t)0xfffff) +#define __io(a) __typesafe_io(PCI_IO_VIRT_BASE + ((a) & IO_SPACE_LIMIT)) #else #define __io(a) __typesafe_io((a) & IO_SPACE_LIMIT) #endif diff --git a/arch/arm/include/asm/mach/map.h b/arch/arm/include/asm/mach/map.h index a6efcdd..195ac2f 100644 --- a/arch/arm/include/asm/mach/map.h +++ b/arch/arm/include/asm/mach/map.h @@ -9,6 +9,9 @@ * * Page table mapping constructs and function prototypes */ +#ifndef __ASM_MACH_MAP_H +#define __ASM_MACH_MAP_H + #include <asm/io.h> struct map_desc { @@ -34,6 +37,8 @@ struct map_desc { #ifdef CONFIG_MMU extern void iotable_init(struct map_desc *, int); +extern void vm_reserve_area_early(unsigned long addr, unsigned long size, + void *caller); struct mem_type; extern const struct mem_type *get_mem_type(unsigned int type); @@ -44,4 +49,7 @@ extern int ioremap_page(unsigned long virt, unsigned long phys, const struct mem_type *mtype); #else #define iotable_init(map,num) do { } while (0) +#define vm_reserve_area_early(a,s,c) do { } while (0) +#endif + #endif diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h index 26c511f..df81887 100644 --- a/arch/arm/include/asm/mach/pci.h +++ b/arch/arm/include/asm/mach/pci.h @@ -11,6 +11,7 @@ #ifndef __ASM_MACH_PCI_H #define __ASM_MACH_PCI_H + struct pci_sys_data; struct pci_ops; struct pci_bus; @@ -55,6 +56,15 @@ struct pci_sys_data { void pci_common_init(struct hw_pci *); /* + * Setup early fixed I/O mapping. + */ +#if defined(CONFIG_PCI) +extern void pci_map_io_early(unsigned long pfn); +#else +static inline void pci_map_io_early(unsigned long pfn) {} +#endif + +/* * PCI controllers */ extern struct pci_ops iop3xx_ops; |