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
virt_to_phys(volatile void * address)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
phys_to_virt(unsigned long address)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 extern void __iomem * __ioremap(unsigned long offset, unsigned long size, unsigned long flags);
104
105 /**
106 * ioremap - map bus memory into CPU space
107 * @offset: bus address of the memory
108 * @size: size of the resource to map
109 *
110 * ioremap performs a platform specific sequence of operations to
111 * make bus memory CPU accessible via the readb/readw/readl/writeb/
112 * writew/writel functions and the other mmio helpers. The returned
113 * address is not guaranteed to be usable directly as a virtual
114 * address.
115 *
116 * If the area you are trying to map is a PCI BAR you should have a
117 * look at pci_iomap().
118 */
119
ioremap(unsigned long offset,unsigned long size)120 static inline void __iomem * ioremap(unsigned long offset, unsigned long size)
121 {
122 return __ioremap(offset, size, 0);
123 }
124
125 extern void __iomem * ioremap_nocache(unsigned long offset, unsigned long size);
126 extern void iounmap(volatile void __iomem *addr);
127
128 /*
129 * bt_ioremap() and bt_iounmap() are for temporary early boot-time
130 * mappings, before the real ioremap() is functional.
131 * A boot-time mapping is currently limited to at most 16 pages.
132 */
133 extern void *bt_ioremap(unsigned long offset, unsigned long size);
134 extern void bt_iounmap(void *addr, unsigned long size);
135 extern void __iomem *fix_ioremap(unsigned idx, unsigned long phys);
136
137 /* Use early IO mappings for DMI because it's initialized early */
138 #define dmi_ioremap bt_ioremap
139 #define dmi_iounmap bt_iounmap
140 #define dmi_alloc alloc_bootmem
141
142 /*
143 * ISA I/O bus memory addresses are 1:1 with the physical address.
144 */
145 #define isa_virt_to_bus virt_to_phys
146 #define isa_page_to_bus page_to_phys
147 #define isa_bus_to_virt phys_to_virt
148
149 /*
150 * However PCI ones are not necessarily 1:1 and therefore these interfaces
151 * are forbidden in portable PCI drivers.
152 *
153 * Allow them on x86 for legacy drivers, though.
154 */
155 #define virt_to_bus virt_to_phys
156 #define bus_to_virt phys_to_virt
157
158 /*
159 * readX/writeX() are used to access memory mapped devices. On some
160 * architectures the memory mapped IO stuff needs to be accessed
161 * differently. On the x86 architecture, we just read/write the
162 * memory location directly.
163 */
164
readb(const volatile void __iomem * addr)165 static inline unsigned char readb(const volatile void __iomem *addr)
166 {
167 return *(volatile unsigned char __force *) addr;
168 }
readw(const volatile void __iomem * addr)169 static inline unsigned short readw(const volatile void __iomem *addr)
170 {
171 return *(volatile unsigned short __force *) addr;
172 }
readl(const volatile void __iomem * addr)173 static inline unsigned int readl(const volatile void __iomem *addr)
174 {
175 return *(volatile unsigned int __force *) addr;
176 }
177 #define readb_relaxed(addr) readb(addr)
178 #define readw_relaxed(addr) readw(addr)
179 #define readl_relaxed(addr) readl(addr)
180 #define __raw_readb readb
181 #define __raw_readw readw
182 #define __raw_readl readl
183
writeb(unsigned char b,volatile void __iomem * addr)184 static inline void writeb(unsigned char b, volatile void __iomem *addr)
185 {
186 *(volatile unsigned char __force *) addr = b;
187 }
writew(unsigned short b,volatile void __iomem * addr)188 static inline void writew(unsigned short b, volatile void __iomem *addr)
189 {
190 *(volatile unsigned short __force *) addr = b;
191 }
writel(unsigned int b,volatile void __iomem * addr)192 static inline void writel(unsigned int b, volatile void __iomem *addr)
193 {
194 *(volatile unsigned int __force *) addr = b;
195 }
196 #define __raw_writeb writeb
197 #define __raw_writew writew
198 #define __raw_writel writel
199
200 #define mmiowb()
201
202 static inline void
memset_io(volatile void __iomem * addr,unsigned char val,int count)203 memset_io(volatile void __iomem *addr, unsigned char val, int count)
204 {
205 memset((void __force *)addr, val, count);
206 }
207
208 static inline void
memcpy_fromio(void * dst,const volatile void __iomem * src,int count)209 memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
210 {
211 __memcpy(dst, (const void __force *)src, count);
212 }
213
214 static inline void
memcpy_toio(volatile void __iomem * dst,const void * src,int count)215 memcpy_toio(volatile void __iomem *dst, const void *src, int count)
216 {
217 __memcpy((void __force *)dst, src, count);
218 }
219
220 /*
221 * ISA space is 'always mapped' on a typical x86 system, no need to
222 * explicitly ioremap() it. The fact that the ISA IO space is mapped
223 * to PAGE_OFFSET is pure coincidence - it does not mean ISA values
224 * are physical addresses. The following constant pointer can be
225 * used as the IO-area pointer (it can be iounmapped as well, so the
226 * analogy with PCI is quite large):
227 */
228 #define __ISA_IO_base ((char __iomem *)(PAGE_OFFSET))
229
230 /*
231 * Cache management
232 *
233 * This needed for two cases
234 * 1. Out of order aware processors
235 * 2. Accidentally out of order processors (PPro errata #51)
236 */
237
238 #if defined(CONFIG_X86_OOSTORE) || defined(CONFIG_X86_PPRO_FENCE)
239
flush_write_buffers(void)240 static inline void flush_write_buffers(void)
241 {
242 __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory");
243 }
244
245 #else
246
247 #define flush_write_buffers() do { } while (0)
248
249 #endif
250
251 #endif /* __KERNEL__ */
252
native_io_delay(void)253 static inline void native_io_delay(void)
254 {
255 asm volatile("outb %%al,$0x80" : : : "memory");
256 }
257
258 #if defined(CONFIG_PARAVIRT)
259 #include <asm/paravirt.h>
260 #else
261
slow_down_io(void)262 static inline void slow_down_io(void) {
263 native_io_delay();
264 #ifdef REALLY_SLOW_IO
265 native_io_delay();
266 native_io_delay();
267 native_io_delay();
268 #endif
269 }
270
271 #endif
272
273 #ifdef CONFIG_X86_NUMAQ
274 extern void *xquad_portio; /* Where the IO area was mapped */
275 #define XQUAD_PORT_ADDR(port, quad) (xquad_portio + (XQUAD_PORTIO_QUAD*quad) + port)
276 #define __BUILDIO(bwl,bw,type) \
277 static inline void out##bwl##_quad(unsigned type value, int port, int quad) { \
278 if (xquad_portio) \
279 write##bwl(value, XQUAD_PORT_ADDR(port, quad)); \
280 else \
281 out##bwl##_local(value, port); \
282 } \
283 static inline void out##bwl(unsigned type value, int port) { \
284 out##bwl##_quad(value, port, 0); \
285 } \
286 static inline unsigned type in##bwl##_quad(int port, int quad) { \
287 if (xquad_portio) \
288 return read##bwl(XQUAD_PORT_ADDR(port, quad)); \
289 else \
290 return in##bwl##_local(port); \
291 } \
292 static inline unsigned type in##bwl(int port) { \
293 return in##bwl##_quad(port, 0); \
294 }
295 #else
296 #define __BUILDIO(bwl,bw,type) \
297 static inline void out##bwl(unsigned type value, int port) { \
298 out##bwl##_local(value, port); \
299 } \
300 static inline unsigned type in##bwl(int port) { \
301 return in##bwl##_local(port); \
302 }
303 #endif
304
305
306 #define BUILDIO(bwl,bw,type) \
307 static inline void out##bwl##_local(unsigned type value, int port) { \
308 __asm__ __volatile__("out" #bwl " %" #bw "0, %w1" : : "a"(value), "Nd"(port)); \
309 } \
310 static inline unsigned type in##bwl##_local(int port) { \
311 unsigned type value; \
312 __asm__ __volatile__("in" #bwl " %w1, %" #bw "0" : "=a"(value) : "Nd"(port)); \
313 return value; \
314 } \
315 static inline void out##bwl##_local_p(unsigned type value, int port) { \
316 out##bwl##_local(value, port); \
317 slow_down_io(); \
318 } \
319 static inline unsigned type in##bwl##_local_p(int port) { \
320 unsigned type value = in##bwl##_local(port); \
321 slow_down_io(); \
322 return value; \
323 } \
324 __BUILDIO(bwl,bw,type) \
325 static inline void out##bwl##_p(unsigned type value, int port) { \
326 out##bwl(value, port); \
327 slow_down_io(); \
328 } \
329 static inline unsigned type in##bwl##_p(int port) { \
330 unsigned type value = in##bwl(port); \
331 slow_down_io(); \
332 return value; \
333 } \
334 static inline void outs##bwl(int port, const void *addr, unsigned long count) { \
335 __asm__ __volatile__("rep; outs" #bwl : "+S"(addr), "+c"(count) : "d"(port)); \
336 } \
337 static inline void ins##bwl(int port, void *addr, unsigned long count) { \
338 __asm__ __volatile__("rep; ins" #bwl : "+D"(addr), "+c"(count) : "d"(port)); \
339 }
340
341 BUILDIO(b,b,char)
342 BUILDIO(w,w,short)
343 BUILDIO(l,,int)
344
345 #endif
346