884525655d
Done per Linus' request and suggestions. Linus has explained that better than I'll be able to explain: On Thu, Mar 27, 2008 at 10:12:10AM -0700, Linus Torvalds wrote: > Actually, before we go any further, there might be a less intrusive > alternative: add just a couple of flags to the resource flags field (we > still have something like 8 unused bits on 32-bit), and use those to > implement a generic "resource_alignment()" routine. > > Two flags would do it: > > - IORESOURCE_SIZEALIGN: size indicates alignment (regular PCI device > resources) > > - IORESOURCE_STARTALIGN: start field is alignment (PCI bus resources > during probing) > > and then the case of both flags zero (or both bits set) would actually be > "invalid", and we would also clear the IORESOURCE_STARTALIGN flag when we > actually allocate the resource (so that we don't use the "start" field as > alignment incorrectly when it no longer indicates alignment). > > That wouldn't be totally generic, but it would have the nice property of > automatically at least add sanity checking for that whole "res->start has > the odd meaning of 'alignment' during probing" and remove the need for a > new field, and it would allow us to have a generic "resource_alignment()" > routine that just gets a resource pointer. Besides, I removed IORESOURCE_BUS_HAS_VGA flag which was unused for ages. Signed-off-by: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Gary Hade <garyhade@us.ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
161 lines
5.8 KiB
C
161 lines
5.8 KiB
C
/*
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* ioport.h Definitions of routines for detecting, reserving and
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* allocating system resources.
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*
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* Authors: Linus Torvalds
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*/
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#ifndef _LINUX_IOPORT_H
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#define _LINUX_IOPORT_H
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#ifndef __ASSEMBLY__
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#include <linux/compiler.h>
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#include <linux/types.h>
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/*
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* Resources are tree-like, allowing
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* nesting etc..
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*/
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struct resource {
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resource_size_t start;
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resource_size_t end;
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const char *name;
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unsigned long flags;
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struct resource *parent, *sibling, *child;
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};
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struct resource_list {
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struct resource_list *next;
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struct resource *res;
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struct pci_dev *dev;
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};
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/*
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* IO resources have these defined flags.
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*/
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#define IORESOURCE_BITS 0x000000ff /* Bus-specific bits */
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#define IORESOURCE_IO 0x00000100 /* Resource type */
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#define IORESOURCE_MEM 0x00000200
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#define IORESOURCE_IRQ 0x00000400
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#define IORESOURCE_DMA 0x00000800
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#define IORESOURCE_PREFETCH 0x00001000 /* No side effects */
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#define IORESOURCE_READONLY 0x00002000
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#define IORESOURCE_CACHEABLE 0x00004000
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#define IORESOURCE_RANGELENGTH 0x00008000
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#define IORESOURCE_SHADOWABLE 0x00010000
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#define IORESOURCE_SIZEALIGN 0x00020000 /* size indicates alignment */
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#define IORESOURCE_STARTALIGN 0x00040000 /* start field is alignment */
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#define IORESOURCE_DISABLED 0x10000000
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#define IORESOURCE_UNSET 0x20000000
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#define IORESOURCE_AUTO 0x40000000
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#define IORESOURCE_BUSY 0x80000000 /* Driver has marked this resource busy */
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/* ISA PnP IRQ specific bits (IORESOURCE_BITS) */
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#define IORESOURCE_IRQ_HIGHEDGE (1<<0)
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#define IORESOURCE_IRQ_LOWEDGE (1<<1)
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#define IORESOURCE_IRQ_HIGHLEVEL (1<<2)
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#define IORESOURCE_IRQ_LOWLEVEL (1<<3)
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#define IORESOURCE_IRQ_SHAREABLE (1<<4)
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/* ISA PnP DMA specific bits (IORESOURCE_BITS) */
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#define IORESOURCE_DMA_TYPE_MASK (3<<0)
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#define IORESOURCE_DMA_8BIT (0<<0)
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#define IORESOURCE_DMA_8AND16BIT (1<<0)
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#define IORESOURCE_DMA_16BIT (2<<0)
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#define IORESOURCE_DMA_MASTER (1<<2)
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#define IORESOURCE_DMA_BYTE (1<<3)
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#define IORESOURCE_DMA_WORD (1<<4)
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#define IORESOURCE_DMA_SPEED_MASK (3<<6)
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#define IORESOURCE_DMA_COMPATIBLE (0<<6)
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#define IORESOURCE_DMA_TYPEA (1<<6)
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#define IORESOURCE_DMA_TYPEB (2<<6)
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#define IORESOURCE_DMA_TYPEF (3<<6)
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/* ISA PnP memory I/O specific bits (IORESOURCE_BITS) */
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#define IORESOURCE_MEM_WRITEABLE (1<<0) /* dup: IORESOURCE_READONLY */
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#define IORESOURCE_MEM_CACHEABLE (1<<1) /* dup: IORESOURCE_CACHEABLE */
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#define IORESOURCE_MEM_RANGELENGTH (1<<2) /* dup: IORESOURCE_RANGELENGTH */
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#define IORESOURCE_MEM_TYPE_MASK (3<<3)
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#define IORESOURCE_MEM_8BIT (0<<3)
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#define IORESOURCE_MEM_16BIT (1<<3)
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#define IORESOURCE_MEM_8AND16BIT (2<<3)
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#define IORESOURCE_MEM_32BIT (3<<3)
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#define IORESOURCE_MEM_SHADOWABLE (1<<5) /* dup: IORESOURCE_SHADOWABLE */
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#define IORESOURCE_MEM_EXPANSIONROM (1<<6)
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/* PCI ROM control bits (IORESOURCE_BITS) */
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#define IORESOURCE_ROM_ENABLE (1<<0) /* ROM is enabled, same as PCI_ROM_ADDRESS_ENABLE */
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#define IORESOURCE_ROM_SHADOW (1<<1) /* ROM is copy at C000:0 */
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#define IORESOURCE_ROM_COPY (1<<2) /* ROM is alloc'd copy, resource field overlaid */
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#define IORESOURCE_ROM_BIOS_COPY (1<<3) /* ROM is BIOS copy, resource field overlaid */
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/* PCI control bits. Shares IORESOURCE_BITS with above PCI ROM. */
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#define IORESOURCE_PCI_FIXED (1<<4) /* Do not move resource */
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/* PC/ISA/whatever - the normal PC address spaces: IO and memory */
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extern struct resource ioport_resource;
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extern struct resource iomem_resource;
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extern int request_resource(struct resource *root, struct resource *new);
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extern int release_resource(struct resource *new);
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extern int insert_resource(struct resource *parent, struct resource *new);
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extern int allocate_resource(struct resource *root, struct resource *new,
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resource_size_t size, resource_size_t min,
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resource_size_t max, resource_size_t align,
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void (*alignf)(void *, struct resource *,
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resource_size_t, resource_size_t),
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void *alignf_data);
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int adjust_resource(struct resource *res, resource_size_t start,
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resource_size_t size);
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resource_size_t resource_alignment(struct resource *res);
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/* Convenience shorthand with allocation */
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#define request_region(start,n,name) __request_region(&ioport_resource, (start), (n), (name))
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#define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name))
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#define rename_region(region, newname) do { (region)->name = (newname); } while (0)
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extern struct resource * __request_region(struct resource *,
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resource_size_t start,
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resource_size_t n, const char *name);
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/* Compatibility cruft */
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#define release_region(start,n) __release_region(&ioport_resource, (start), (n))
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#define check_mem_region(start,n) __check_region(&iomem_resource, (start), (n))
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#define release_mem_region(start,n) __release_region(&iomem_resource, (start), (n))
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extern int __check_region(struct resource *, resource_size_t, resource_size_t);
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extern void __release_region(struct resource *, resource_size_t,
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resource_size_t);
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static inline int __deprecated check_region(resource_size_t s,
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resource_size_t n)
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{
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return __check_region(&ioport_resource, s, n);
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}
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/* Wrappers for managed devices */
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struct device;
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#define devm_request_region(dev,start,n,name) \
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__devm_request_region(dev, &ioport_resource, (start), (n), (name))
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#define devm_request_mem_region(dev,start,n,name) \
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__devm_request_region(dev, &iomem_resource, (start), (n), (name))
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extern struct resource * __devm_request_region(struct device *dev,
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struct resource *parent, resource_size_t start,
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resource_size_t n, const char *name);
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#define devm_release_region(start,n) \
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__devm_release_region(dev, &ioport_resource, (start), (n))
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#define devm_release_mem_region(start,n) \
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__devm_release_region(dev, &iomem_resource, (start), (n))
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extern void __devm_release_region(struct device *dev, struct resource *parent,
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resource_size_t start, resource_size_t n);
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#endif /* __ASSEMBLY__ */
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#endif /* _LINUX_IOPORT_H */
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