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H. Peter Anvin1965aae2008-10-22 22:26:29 -07001#ifndef _ASM_X86_IO_H
2#define _ASM_X86_IO_H
venkatesh.pallipadi@intel.come045fb22008-03-18 17:00:15 -07003
venkatesh.pallipadi@intel.comb310f381d2008-03-18 17:00:24 -07004#define ARCH_HAS_IOREMAP_WC
5
Linus Torvaldsc1f64a52008-05-27 09:47:13 -07006#include <linux/compiler.h>
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +09007#include <asm-generic/int-ll64.h>
Jeremy Fitzhardinge976e8f62009-02-06 13:29:44 -08008#include <asm/page.h>
Linus Torvaldsc1f64a52008-05-27 09:47:13 -07009
10#define build_mmio_read(name, size, type, reg, barrier) \
11static inline type name(const volatile void __iomem *addr) \
Mikael Pettersson1c5b0eb2008-08-13 21:07:07 +020012{ type ret; asm volatile("mov" size " %1,%0":reg (ret) \
Linus Torvaldsc1f64a52008-05-27 09:47:13 -070013:"m" (*(volatile type __force *)addr) barrier); return ret; }
14
15#define build_mmio_write(name, size, type, reg, barrier) \
16static inline void name(type val, volatile void __iomem *addr) \
17{ asm volatile("mov" size " %0,%1": :reg (val), \
18"m" (*(volatile type __force *)addr) barrier); }
19
Mikael Pettersson1c5b0eb2008-08-13 21:07:07 +020020build_mmio_read(readb, "b", unsigned char, "=q", :"memory")
21build_mmio_read(readw, "w", unsigned short, "=r", :"memory")
22build_mmio_read(readl, "l", unsigned int, "=r", :"memory")
Linus Torvaldsc1f64a52008-05-27 09:47:13 -070023
Mikael Pettersson1c5b0eb2008-08-13 21:07:07 +020024build_mmio_read(__readb, "b", unsigned char, "=q", )
25build_mmio_read(__readw, "w", unsigned short, "=r", )
26build_mmio_read(__readl, "l", unsigned int, "=r", )
Linus Torvaldsc1f64a52008-05-27 09:47:13 -070027
28build_mmio_write(writeb, "b", unsigned char, "q", :"memory")
29build_mmio_write(writew, "w", unsigned short, "r", :"memory")
30build_mmio_write(writel, "l", unsigned int, "r", :"memory")
31
32build_mmio_write(__writeb, "b", unsigned char, "q", )
33build_mmio_write(__writew, "w", unsigned short, "r", )
34build_mmio_write(__writel, "l", unsigned int, "r", )
35
36#define readb_relaxed(a) __readb(a)
37#define readw_relaxed(a) __readw(a)
38#define readl_relaxed(a) __readl(a)
39#define __raw_readb __readb
40#define __raw_readw __readw
41#define __raw_readl __readl
42
43#define __raw_writeb __writeb
44#define __raw_writew __writew
45#define __raw_writel __writel
46
47#define mmiowb() barrier()
48
49#ifdef CONFIG_X86_64
Ingo Molnar93093d02008-11-30 10:20:20 +010050
Mikael Pettersson1c5b0eb2008-08-13 21:07:07 +020051build_mmio_read(readq, "q", unsigned long, "=r", :"memory")
Linus Torvaldsc1f64a52008-05-27 09:47:13 -070052build_mmio_write(writeq, "q", unsigned long, "r", :"memory")
Linus Torvaldsc1f64a52008-05-27 09:47:13 -070053
Ingo Molnar93093d02008-11-30 10:20:20 +010054#else
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +090055
56static inline __u64 readq(const volatile void __iomem *addr)
57{
58 const volatile u32 __iomem *p = addr;
Ingo Molnara0b11312008-11-30 09:33:55 +010059 u32 low, high;
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +090060
Ingo Molnara0b11312008-11-30 09:33:55 +010061 low = readl(p);
62 high = readl(p + 1);
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +090063
Ingo Molnara0b11312008-11-30 09:33:55 +010064 return low + ((u64)high << 32);
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +090065}
66
67static inline void writeq(__u64 val, volatile void __iomem *addr)
68{
69 writel(val, addr);
70 writel(val >> 32, addr+4);
71}
72
Ingo Molnara0b11312008-11-30 09:33:55 +010073#endif
74
Ingo Molnar93093d02008-11-30 10:20:20 +010075#define readq_relaxed(a) readq(a)
76
77#define __raw_readq(a) readq(a)
78#define __raw_writeq(val, addr) writeq(val, addr)
79
Ingo Molnara0b11312008-11-30 09:33:55 +010080/* Let people know that we have them */
Ingo Molnar93093d02008-11-30 10:20:20 +010081#define readq readq
82#define writeq writeq
Hitoshi Mitake2c5643b2008-11-30 17:16:04 +090083
Jeremy Fitzhardinge976e8f62009-02-06 13:29:44 -080084/**
85 * virt_to_phys - map virtual addresses to physical
86 * @address: address to remap
87 *
88 * The returned physical address is the physical (CPU) mapping for
89 * the memory address given. It is only valid to use this function on
90 * addresses directly mapped or allocated via kmalloc.
91 *
92 * This function does not give bus mappings for DMA transfers. In
93 * almost all conceivable cases a device driver should not be using
94 * this function
95 */
96
97static inline phys_addr_t virt_to_phys(volatile void *address)
98{
99 return __pa(address);
100}
101
102/**
103 * phys_to_virt - map physical address to virtual
104 * @address: address to remap
105 *
106 * The returned virtual address is a current CPU mapping for
107 * the memory address given. It is only valid to use this function on
108 * addresses that have a kernel mapping
109 *
110 * This function does not handle bus mappings for DMA transfers. In
111 * almost all conceivable cases a device driver should not be using
112 * this function
113 */
114
115static inline void *phys_to_virt(phys_addr_t address)
116{
117 return __va(address);
118}
119
120/*
121 * Change "struct page" to physical address.
122 */
123#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
124
125/*
126 * ISA I/O bus memory addresses are 1:1 with the physical address.
127 */
James Bottomleybf33a702009-02-13 12:52:44 -0600128#define isa_virt_to_bus (unsigned long)virt_to_phys
Jeremy Fitzhardinge976e8f62009-02-06 13:29:44 -0800129#define isa_page_to_bus page_to_phys
130#define isa_bus_to_virt phys_to_virt
131
132/*
133 * However PCI ones are not necessarily 1:1 and therefore these interfaces
134 * are forbidden in portable PCI drivers.
135 *
136 * Allow them on x86 for legacy drivers, though.
137 */
138#define virt_to_bus virt_to_phys
139#define bus_to_virt phys_to_virt
140
Jeremy Fitzhardinge133822c2009-02-06 13:29:52 -0800141/**
142 * ioremap - map bus memory into CPU space
143 * @offset: bus address of the memory
144 * @size: size of the resource to map
145 *
146 * ioremap performs a platform specific sequence of operations to
147 * make bus memory CPU accessible via the readb/readw/readl/writeb/
148 * writew/writel functions and the other mmio helpers. The returned
149 * address is not guaranteed to be usable directly as a virtual
150 * address.
151 *
152 * If the area you are trying to map is a PCI BAR you should have a
153 * look at pci_iomap().
154 */
155extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
156extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
157extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
158 unsigned long prot_val);
159
160/*
161 * The default ioremap() behavior is non-cached:
162 */
163static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
164{
165 return ioremap_nocache(offset, size);
166}
167
168extern void iounmap(volatile void __iomem *addr);
169
170extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
171
Jaswinder Singh9321b8c2008-07-21 22:24:29 +0530172
Thomas Gleixner96a388d2007-10-11 11:20:03 +0200173#ifdef CONFIG_X86_32
174# include "io_32.h"
175#else
176# include "io_64.h"
177#endif
venkatesh.pallipadi@intel.come045fb22008-03-18 17:00:15 -0700178
179extern void *xlate_dev_mem_ptr(unsigned long phys);
180extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
181
venkatesh.pallipadi@intel.com3a96ce82008-03-18 17:00:16 -0700182extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
183 unsigned long prot_val);
venkatesh.pallipadi@intel.comd639bab2009-01-09 16:13:13 -0800184extern void __iomem *ioremap_wc(resource_size_t offset, unsigned long size);
venkatesh.pallipadi@intel.com3a96ce82008-03-18 17:00:16 -0700185
Jeremy Fitzhardinge4583ed52008-06-25 00:19:03 -0400186/*
187 * early_ioremap() and early_iounmap() are for temporary early boot-time
188 * mappings, before the real ioremap() is functional.
189 * A boot-time mapping is currently limited to at most 16 pages.
190 */
191extern void early_ioremap_init(void);
Jeremy Fitzhardinge4583ed52008-06-25 00:19:03 -0400192extern void early_ioremap_reset(void);
Harvey Harrison1d6cf1f2008-10-28 22:46:04 -0700193extern void __iomem *early_ioremap(unsigned long offset, unsigned long size);
194extern void __iomem *early_memremap(unsigned long offset, unsigned long size);
195extern void early_iounmap(void __iomem *addr, unsigned long size);
Jeremy Fitzhardinge4583ed52008-06-25 00:19:03 -0400196extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
197
Jeremy Fitzhardingea4487202009-01-28 15:42:23 -0800198#define IO_SPACE_LIMIT 0xffff
Jeremy Fitzhardinge4583ed52008-06-25 00:19:03 -0400199
H. Peter Anvin1965aae2008-10-22 22:26:29 -0700200#endif /* _ASM_X86_IO_H */