Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6] / include / asm-x86 / io_32.h
1 #ifndef _ASM_IO_H
2 #define _ASM_IO_H
3
4 #include <linux/string.h>
5 #include <linux/compiler.h>
6
7 /*
8  * This file contains the definitions for the x86 IO instructions
9  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
10  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
11  * versions of the single-IO instructions (inb_p/inw_p/..).
12  *
13  * This file is not meant to be obfuscating: it's just complicated
14  * to (a) handle it all in a way that makes gcc able to optimize it
15  * as well as possible and (b) trying to avoid writing the same thing
16  * over and over again with slight variations and possibly making a
17  * mistake somewhere.
18  */
19
20 /*
21  * Thanks to James van Artsdalen for a better timing-fix than
22  * the two short jumps: using outb's to a nonexistent port seems
23  * to guarantee better timings even on fast machines.
24  *
25  * On the other hand, I'd like to be sure of a non-existent port:
26  * I feel a bit unsafe about using 0x80 (should be safe, though)
27  *
28  *              Linus
29  */
30
31  /*
32   *  Bit simplified and optimized by Jan Hubicka
33   *  Support of BIGMEM added by Gerhard Wichert, Siemens AG, July 1999.
34   *
35   *  isa_memset_io, isa_memcpy_fromio, isa_memcpy_toio added,
36   *  isa_read[wl] and isa_write[wl] fixed
37   *  - Arnaldo Carvalho de Melo <acme@conectiva.com.br>
38   */
39
40 #define IO_SPACE_LIMIT 0xffff
41
42 #define XQUAD_PORTIO_BASE 0xfe400000
43 #define XQUAD_PORTIO_QUAD 0x40000  /* 256k per quad. */
44
45 #ifdef __KERNEL__
46
47 #include <asm-generic/iomap.h>
48
49 #include <linux/vmalloc.h>
50
51 /*
52  * Convert a virtual cached pointer to an uncached pointer
53  */
54 #define xlate_dev_kmem_ptr(p)   p
55
56 /**
57  *      virt_to_phys    -       map virtual addresses to physical
58  *      @address: address to remap
59  *
60  *      The returned physical address is the physical (CPU) mapping for
61  *      the memory address given. It is only valid to use this function on
62  *      addresses directly mapped or allocated via kmalloc.
63  *
64  *      This function does not give bus mappings for DMA transfers. In
65  *      almost all conceivable cases a device driver should not be using
66  *      this function
67  */
68
69 static inline unsigned long virt_to_phys(volatile void *address)
70 {
71         return __pa(address);
72 }
73
74 /**
75  *      phys_to_virt    -       map physical address to virtual
76  *      @address: address to remap
77  *
78  *      The returned virtual address is a current CPU mapping for
79  *      the memory address given. It is only valid to use this function on
80  *      addresses that have a kernel mapping
81  *
82  *      This function does not handle bus mappings for DMA transfers. In
83  *      almost all conceivable cases a device driver should not be using
84  *      this function
85  */
86
87 static inline void *phys_to_virt(unsigned long address)
88 {
89         return __va(address);
90 }
91
92 /*
93  * Change "struct page" to physical address.
94  */
95 #define page_to_phys(page)    ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
96
97 /**
98  * ioremap     -   map bus memory into CPU space
99  * @offset:    bus address of the memory
100  * @size:      size of the resource to map
101  *
102  * ioremap performs a platform specific sequence of operations to
103  * make bus memory CPU accessible via the readb/readw/readl/writeb/
104  * writew/writel functions and the other mmio helpers. The returned
105  * address is not guaranteed to be usable directly as a virtual
106  * address.
107  *
108  * If the area you are trying to map is a PCI BAR you should have a
109  * look at pci_iomap().
110  */
111 extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
112 extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
113 extern void __iomem *ioremap_prot(resource_size_t offset, unsigned long size,
114                                 unsigned long prot_val);
115
116 /*
117  * The default ioremap() behavior is non-cached:
118  */
119 static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
120 {
121         return ioremap_nocache(offset, size);
122 }
123
124 extern void iounmap(volatile void __iomem *addr);
125
126 /*
127  * ISA I/O bus memory addresses are 1:1 with the physical address.
128  */
129 #define isa_virt_to_bus virt_to_phys
130 #define isa_page_to_bus page_to_phys
131 #define isa_bus_to_virt phys_to_virt
132
133 /*
134  * However PCI ones are not necessarily 1:1 and therefore these interfaces
135  * are forbidden in portable PCI drivers.
136  *
137  * Allow them on x86 for legacy drivers, though.
138  */
139 #define virt_to_bus virt_to_phys
140 #define bus_to_virt phys_to_virt
141
142 static inline void
143 memset_io(volatile void __iomem *addr, unsigned char val, int count)
144 {
145         memset((void __force *)addr, val, count);
146 }
147
148 static inline void
149 memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
150 {
151         __memcpy(dst, (const void __force *)src, count);
152 }
153
154 static inline void
155 memcpy_toio(volatile void __iomem *dst, const void *src, int count)
156 {
157         __memcpy((void __force *)dst, src, count);
158 }
159
160 /*
161  * ISA space is 'always mapped' on a typical x86 system, no need to
162  * explicitly ioremap() it. The fact that the ISA IO space is mapped
163  * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
164  * are physical addresses. The following constant pointer can be
165  * used as the IO-area pointer (it can be iounmapped as well, so the
166  * analogy with PCI is quite large):
167  */
168 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
169
170 /*
171  *      Cache management
172  *
173  *      This needed for two cases
174  *      1. Out of order aware processors
175  *      2. Accidentally out of order processors (PPro errata #51)
176  */
177
178 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
179
180 static inline void flush_write_buffers(void)
181 {
182         asm volatile("lock; addl $0,0(%%esp)": : :"memory");
183 }
184
185 #else
186
187 #define flush_write_buffers() do { } while (0)
188
189 #endif
190
191 #endif /* __KERNEL__ */
192
193 extern void native_io_delay(void);
194
195 extern int io_delay_type;
196 extern void io_delay_init(void);
197
198 #if defined(CONFIG_PARAVIRT)
199 #include <asm/paravirt.h>
200 #else
201
202 static inline void slow_down_io(void)
203 {
204         native_io_delay();
205 #ifdef REALLY_SLOW_IO
206         native_io_delay();
207         native_io_delay();
208         native_io_delay();
209 #endif
210 }
211
212 #endif
213
214 #define __BUILDIO(bwl, bw, type)                                \
215 static inline void out##bwl(unsigned type value, int port)      \
216 {                                                               \
217         out##bwl##_local(value, port);                          \
218 }                                                               \
219                                                                 \
220 static inline unsigned type in##bwl(int port)                   \
221 {                                                               \
222         return in##bwl##_local(port);                           \
223 }
224
225 #define BUILDIO(bwl, bw, type)                                          \
226 static inline void out##bwl##_local(unsigned type value, int port)      \
227 {                                                                       \
228         asm volatile("out" #bwl " %" #bw "0, %w1"               \
229                      : : "a"(value), "Nd"(port));                       \
230 }                                                                       \
231                                                                         \
232 static inline unsigned type in##bwl##_local(int port)                   \
233 {                                                                       \
234         unsigned type value;                                            \
235         asm volatile("in" #bwl " %w1, %" #bw "0"                \
236                      : "=a"(value) : "Nd"(port));                       \
237         return value;                                                   \
238 }                                                                       \
239                                                                         \
240 static inline void out##bwl##_local_p(unsigned type value, int port)    \
241 {                                                                       \
242         out##bwl##_local(value, port);                                  \
243         slow_down_io();                                                 \
244 }                                                                       \
245                                                                         \
246 static inline unsigned type in##bwl##_local_p(int port)                 \
247 {                                                                       \
248         unsigned type value = in##bwl##_local(port);                    \
249         slow_down_io();                                                 \
250         return value;                                                   \
251 }                                                                       \
252                                                                         \
253 __BUILDIO(bwl, bw, type)                                                \
254                                                                         \
255 static inline void out##bwl##_p(unsigned type value, int port)          \
256 {                                                                       \
257         out##bwl(value, port);                                          \
258         slow_down_io();                                                 \
259 }                                                                       \
260                                                                         \
261 static inline unsigned type in##bwl##_p(int port)                       \
262 {                                                                       \
263         unsigned type value = in##bwl(port);                            \
264         slow_down_io();                                                 \
265         return value;                                                   \
266 }                                                                       \
267                                                                         \
268 static inline void outs##bwl(int port, const void *addr, unsigned long count) \
269 {                                                                       \
270         asm volatile("rep; outs" #bwl                                   \
271                      : "+S"(addr), "+c"(count) : "d"(port));            \
272 }                                                                       \
273                                                                         \
274 static inline void ins##bwl(int port, void *addr, unsigned long count)  \
275 {                                                                       \
276         asm volatile("rep; ins" #bwl                                    \
277                      : "+D"(addr), "+c"(count) : "d"(port));            \
278 }
279
280 BUILDIO(b, b, char)
281 BUILDIO(w, w, short)
282 BUILDIO(l, , int)
283
284 #endif