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 physical pointer to a virtual kernel pointer for /dev/mem
53 * access
54 */
55 #define xlate_dev_mem_ptr(p) __va(p)
56
57 /*
58 * Convert a virtual cached pointer to an uncached pointer
59 */
60 #define xlate_dev_kmem_ptr(p) p
61
62 /**
63 * virt_to_phys - map virtual addresses to physical
64 * @address: address to remap
65 *
66 * The returned physical address is the physical (CPU) mapping for
67 * the memory address given. It is only valid to use this function on
68 * addresses directly mapped or allocated via kmalloc.
69 *
70 * This function does not give bus mappings for DMA transfers. In
71 * almost all conceivable cases a device driver should not be using
72 * this function
73 */
74
75 static inline unsigned long virt_to_phys(volatile void * address)
76 {
77 return __pa(address);
78 }
79
80 /**
81 * phys_to_virt - map physical address to virtual
82 * @address: address to remap
83 *
84 * The returned virtual address is a current CPU mapping for
85 * the memory address given. It is only valid to use this function on
86 * addresses that have a kernel mapping
87 *
88 * This function does not handle bus mappings for DMA transfers. In
89 * almost all conceivable cases a device driver should not be using
90 * this function
91 */
92
93 static inline void * phys_to_virt(unsigned long address)
94 {
95 return __va(address);
96 }
97
98 /*
99 * Change "struct page" to physical address.
100 */
101 #define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
102
103 /**
104 * ioremap - map bus memory into CPU space
105 * @offset: bus address of the memory
106 * @size: size of the resource to map
107 *
108 * ioremap performs a platform specific sequence of operations to
109 * make bus memory CPU accessible via the readb/readw/readl/writeb/
110 * writew/writel functions and the other mmio helpers. The returned
111 * address is not guaranteed to be usable directly as a virtual
112 * address.
113 *
114 * If the area you are trying to map is a PCI BAR you should have a
115 * look at pci_iomap().
116 */
117 extern void __iomem *ioremap_nocache(resource_size_t offset, unsigned long size);
118 extern void __iomem *ioremap_cache(resource_size_t offset, unsigned long size);
119
120 /*
121 * The default ioremap() behavior is non-cached:
122 */
123 static inline void __iomem *ioremap(resource_size_t offset, unsigned long size)
124 {
125 return ioremap_nocache(offset, size);
126 }
127
128 extern void iounmap(volatile void __iomem *addr);
129
130 /*
131 * early_ioremap() and early_iounmap() are for temporary early boot-time
132 * mappings, before the real ioremap() is functional.
133 * A boot-time mapping is currently limited to at most 16 pages.
134 */
135 extern void early_ioremap_init(void);
136 extern void early_ioremap_clear(void);
137 extern void early_ioremap_reset(void);
138 extern void *early_ioremap(unsigned long offset, unsigned long size);
139 extern void early_iounmap(void *addr, unsigned long size);
140 extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
141
142 /* Use early IO mappings for DMI because it's initialized early */
143 #define dmi_ioremap early_ioremap
144 #define dmi_iounmap early_iounmap
145 #define dmi_alloc alloc_bootmem
146
147 /*
148 * ISA I/O bus memory addresses are 1:1 with the physical address.
149 */
150 #define isa_virt_to_bus virt_to_phys
151 #define isa_page_to_bus page_to_phys
152 #define isa_bus_to_virt phys_to_virt
153
154 /*
155 * However PCI ones are not necessarily 1:1 and therefore these interfaces
156 * are forbidden in portable PCI drivers.
157 *
158 * Allow them on x86 for legacy drivers, though.
159 */
160 #define virt_to_bus virt_to_phys
161 #define bus_to_virt phys_to_virt
162
163 /*
164 * readX/writeX() are used to access memory mapped devices. On some
165 * architectures the memory mapped IO stuff needs to be accessed
166 * differently. On the x86 architecture, we just read/write the
167 * memory location directly.
168 */
169
170 static inline unsigned char readb(const volatile void __iomem *addr)
171 {
172 return *(volatile unsigned char __force *) addr;
173 }
174 static inline unsigned short readw(const volatile void __iomem *addr)
175 {
176 return *(volatile unsigned short __force *) addr;
177 }
178 static inline unsigned int readl(const volatile void __iomem *addr)
179 {
180 return *(volatile unsigned int __force *) addr;
181 }
182 #define readb_relaxed(addr) readb(addr)
183 #define readw_relaxed(addr) readw(addr)
184 #define readl_relaxed(addr) readl(addr)
185 #define __raw_readb readb
186 #define __raw_readw readw
187 #define __raw_readl readl
188
189 static inline void writeb(unsigned char b, volatile void __iomem *addr)
190 {
191 *(volatile unsigned char __force *) addr = b;
192 }
193 static inline void writew(unsigned short b, volatile void __iomem *addr)
194 {
195 *(volatile unsigned short __force *) addr = b;
196 }
197 static inline void writel(unsigned int b, volatile void __iomem *addr)
198 {
199 *(volatile unsigned int __force *) addr = b;
200 }
201 #define __raw_writeb writeb
202 #define __raw_writew writew
203 #define __raw_writel writel
204
205 #define mmiowb()
206
207 static inline void
208 memset_io(volatile void __iomem *addr, unsigned char val, int count)
209 {
210 memset((void __force *)addr, val, count);
211 }
212
213 static inline void
214 memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
215 {
216 __memcpy(dst, (const void __force *)src, count);
217 }
218
219 static inline void
220 memcpy_toio(volatile void __iomem *dst, const void *src, int count)
221 {
222 __memcpy((void __force *)dst, src, count);
223 }
224
225 /*
226 * ISA space is 'always mapped' on a typical x86 system, no need to
227 * explicitly ioremap() it. The fact that the ISA IO space is mapped
228 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
229 * are physical addresses. The following constant pointer can be
230 * used as the IO-area pointer (it can be iounmapped as well, so the
231 * analogy with PCI is quite large):
232 */
233 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
234
235 /*
236 * Cache management
237 *
238 * This needed for two cases
239 * 1. Out of order aware processors
240 * 2. Accidentally out of order processors (PPro errata #51)
241 */
242
243 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
244
245 static inline void flush_write_buffers(void)
246 {
247 __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
248 }
249
250 #else
251
252 #define flush_write_buffers() do { } while (0)
253
254 #endif
255
256 #endif /* __KERNEL__ */
257
258 extern void native_io_delay(void);
259
260 extern int io_delay_type;
261 extern void io_delay_init(void);
262
263 #if defined(CONFIG_PARAVIRT)
264 #include <asm/paravirt.h>
265 #else
266
267 static inline void slow_down_io(void) {
268 native_io_delay();
269 #ifdef REALLY_SLOW_IO
270 native_io_delay();
271 native_io_delay();
272 native_io_delay();
273 #endif
274 }
275
276 #endif
277
278 #define __BUILDIO(bwl,bw,type) \
279 static inline void out##bwl(unsigned type value, int port) { \
280 out##bwl##_local(value, port); \
281 } \
282 static inline unsigned type in##bwl(int port) { \
283 return in##bwl##_local(port); \
284 }
285
286 #define BUILDIO(bwl,bw,type) \
287 static inline void out##bwl##_local(unsigned type value, int port) { \
288 __asm__ __volatile__("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port)); \
289 } \
290 static inline unsigned type in##bwl##_local(int port) { \
291 unsigned type value; \
292 __asm__ __volatile__("in" #bwl " %w1, %" #bw "" : "=a"(value) : "Nd"(port)); \
293 return value; \
294 } \
295 static inline void out##bwl##_local_p(unsigned type value, int port) { \
296 out##bwl##_local(value, port); \
297 slow_down_io(); \
298 } \
299 static inline unsigned type in##bwl##_local_p(int port) { \
300 unsigned type value = in##bwl##_local(port); \
301 slow_down_io(); \
302 return value; \
303 } \
304 __BUILDIO(bwl,bw,type) \
305 static inline void out##bwl##_p(unsigned type value, int port) { \
306 out##bwl(value, port); \
307 slow_down_io(); \
308 } \
309 static inline unsigned type in##bwl##_p(int port) { \
310 unsigned type value = in##bwl(port); \
311 slow_down_io(); \
312 return value; \
313 } \
314 static inline void outs##bwl(int port, const void *addr, unsigned long count) { \
315 __asm__ __volatile__("rep; outs" #bwl : "+S"(addr), "+c"(count) : "d"(port)); \
316 } \
317 static inline void ins##bwl(int port, void *addr, unsigned long count) { \
318 __asm__ __volatile__("rep; ins" #bwl : "+D"(addr), "+c"(count) : "d"(port)); \
319 }
320
321 BUILDIO(b,b,char)
322 BUILDIO(w,w,short)
323 BUILDIO(l,,int)
324
325 #endif
326
|
This page was automatically generated by the
LXR engine.
|