1 #ifndef _ASM_IA64_IO_H
2 #define _ASM_IA64_IO_H
3
4 /*
5 * This file contains the definitions for the emulated IO instructions
6 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
7 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
8 * versions of the single-IO instructions (inb_p/inw_p/..).
9 *
10 * This file is not meant to be obfuscating: it's just complicated to
11 * (a) handle it all in a way that makes gcc able to optimize it as
12 * well as possible and (b) trying to avoid writing the same thing
13 * over and over again with slight variations and possibly making a
14 * mistake somewhere.
15 *
16 * Copyright (C) 1998-2002 Hewlett-Packard Co
17 * David Mosberger-Tang <davidm@hpl.hp.com>
18 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
19 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
20 */
21
22 /* We don't use IO slowdowns on the ia64, but.. */
23 #define __SLOW_DOWN_IO do { } while (0)
24 #define SLOW_DOWN_IO do { } while (0)
25
26 #define __IA64_UNCACHED_OFFSET 0xc000000000000000 /* region 6 */
27
28 /*
29 * The legacy I/O space defined by the ia64 architecture supports only 65536 ports, but
30 * large machines may have multiple other I/O spaces so we can't place any a priori limit
31 * on IO_SPACE_LIMIT. These additional spaces are described in ACPI.
32 */
33 #define IO_SPACE_LIMIT 0xffffffffffffffffUL
34
35 #define MAX_IO_SPACES 16
36 #define IO_SPACE_BITS 24
37 #define IO_SPACE_SIZE (1UL << IO_SPACE_BITS)
38
39 #define IO_SPACE_NR(port) ((port) >> IO_SPACE_BITS)
40 #define IO_SPACE_BASE(space) ((space) << IO_SPACE_BITS)
41 #define IO_SPACE_PORT(port) ((port) & (IO_SPACE_SIZE - 1))
42
43 #define IO_SPACE_SPARSE_ENCODING(p) ((((p) >> 2) << 12) | (p & 0xfff))
44
45 struct io_space {
46 unsigned long mmio_base; /* base in MMIO space */
47 int sparse;
48 };
49
50 extern struct io_space io_space[];
51 extern unsigned int num_io_spaces;
52
53 # ifdef __KERNEL__
54
55 #include <asm/machvec.h>
56 #include <asm/page.h>
57 #include <asm/system.h>
58
59 /*
60 * Change virtual addresses to physical addresses and vv.
61 */
62 static inline unsigned long
virt_to_phys(volatile void * address)63 virt_to_phys (volatile void *address)
64 {
65 return (unsigned long) address - PAGE_OFFSET;
66 }
67
68 static inline void*
phys_to_virt(unsigned long address)69 phys_to_virt (unsigned long address)
70 {
71 return (void *) (address + PAGE_OFFSET);
72 }
73
74 /*
75 * The following two macros are deprecated and scheduled for removal.
76 * Please use the PCI-DMA interface defined in <asm/pci.h> instead.
77 */
78 #define bus_to_virt phys_to_virt
79 #define virt_to_bus virt_to_phys
80 #define page_to_bus page_to_phys
81
82 # endif /* KERNEL */
83
84 /*
85 * Memory fence w/accept. This should never be used in code that is
86 * not IA-64 specific.
87 */
88 #define __ia64_mf_a() __asm__ __volatile__ ("mf.a" ::: "memory")
89
90 static inline const unsigned long
__ia64_get_io_port_base(void)91 __ia64_get_io_port_base (void)
92 {
93 extern unsigned long ia64_iobase;
94
95 return ia64_iobase;
96 }
97
98 static inline void*
__ia64_mk_io_addr(unsigned long port)99 __ia64_mk_io_addr (unsigned long port)
100 {
101 struct io_space *space;
102 unsigned long offset;
103
104 space = &io_space[IO_SPACE_NR(port)];
105 port = IO_SPACE_PORT(port);
106 if (space->sparse)
107 offset = IO_SPACE_SPARSE_ENCODING(port);
108 else
109 offset = port;
110
111 return (void *) (space->mmio_base | offset);
112 }
113
114 /*
115 * For the in/out routines, we need to do "mf.a" _after_ doing the I/O access to ensure
116 * that the access has completed before executing other I/O accesses. Since we're doing
117 * the accesses through an uncachable (UC) translation, the CPU will execute them in
118 * program order. However, we still need to tell the compiler not to shuffle them around
119 * during optimization, which is why we use "volatile" pointers.
120 */
121
122 static inline unsigned int
__ia64_inb(unsigned long port)123 __ia64_inb (unsigned long port)
124 {
125 volatile unsigned char *addr = __ia64_mk_io_addr(port);
126 unsigned char ret;
127
128 ret = *addr;
129 __ia64_mf_a();
130 return ret;
131 }
132
133 static inline unsigned int
__ia64_inw(unsigned long port)134 __ia64_inw (unsigned long port)
135 {
136 volatile unsigned short *addr = __ia64_mk_io_addr(port);
137 unsigned short ret;
138
139 ret = *addr;
140 __ia64_mf_a();
141 return ret;
142 }
143
144 static inline unsigned int
__ia64_inl(unsigned long port)145 __ia64_inl (unsigned long port)
146 {
147 volatile unsigned int *addr = __ia64_mk_io_addr(port);
148 unsigned int ret;
149
150 ret = *addr;
151 __ia64_mf_a();
152 return ret;
153 }
154
155 static inline void
__ia64_outb(unsigned char val,unsigned long port)156 __ia64_outb (unsigned char val, unsigned long port)
157 {
158 volatile unsigned char *addr = __ia64_mk_io_addr(port);
159
160 *addr = val;
161 __ia64_mf_a();
162 }
163
164 static inline void
__ia64_outw(unsigned short val,unsigned long port)165 __ia64_outw (unsigned short val, unsigned long port)
166 {
167 volatile unsigned short *addr = __ia64_mk_io_addr(port);
168
169 *addr = val;
170 __ia64_mf_a();
171 }
172
173 static inline void
__ia64_outl(unsigned int val,unsigned long port)174 __ia64_outl (unsigned int val, unsigned long port)
175 {
176 volatile unsigned int *addr = __ia64_mk_io_addr(port);
177
178 *addr = val;
179 __ia64_mf_a();
180 }
181
182 static inline void
__insb(unsigned long port,void * dst,unsigned long count)183 __insb (unsigned long port, void *dst, unsigned long count)
184 {
185 unsigned char *dp = dst;
186
187 if (platform_inb == __ia64_inb) {
188 volatile unsigned char *addr = __ia64_mk_io_addr(port);
189
190 __ia64_mf_a();
191 while (count--)
192 *dp++ = *addr;
193 __ia64_mf_a();
194 } else
195 while (count--)
196 *dp++ = platform_inb(port);
197 return;
198 }
199
200 static inline void
__insw(unsigned long port,void * dst,unsigned long count)201 __insw (unsigned long port, void *dst, unsigned long count)
202 {
203 unsigned short *dp = dst;
204
205 if (platform_inw == __ia64_inw) {
206 volatile unsigned short *addr = __ia64_mk_io_addr(port);
207
208 __ia64_mf_a();
209 while (count--)
210 *dp++ = *addr;
211 __ia64_mf_a();
212 } else
213 while (count--)
214 *dp++ = platform_inw(port);
215 return;
216 }
217
218 static inline void
__insl(unsigned long port,void * dst,unsigned long count)219 __insl (unsigned long port, void *dst, unsigned long count)
220 {
221 unsigned int *dp = dst;
222
223 if (platform_inl == __ia64_inl) {
224 volatile unsigned int *addr = __ia64_mk_io_addr(port);
225
226 __ia64_mf_a();
227 while (count--)
228 *dp++ = *addr;
229 __ia64_mf_a();
230 } else
231 while (count--)
232 *dp++ = platform_inl(port);
233 return;
234 }
235
236 static inline void
__outsb(unsigned long port,const void * src,unsigned long count)237 __outsb (unsigned long port, const void *src, unsigned long count)
238 {
239 const unsigned char *sp = src;
240
241 if (platform_outb == __ia64_outb) {
242 volatile unsigned char *addr = __ia64_mk_io_addr(port);
243
244 while (count--)
245 *addr = *sp++;
246 __ia64_mf_a();
247 } else
248 while (count--)
249 platform_outb(*sp++, port);
250 return;
251 }
252
253 static inline void
__outsw(unsigned long port,const void * src,unsigned long count)254 __outsw (unsigned long port, const void *src, unsigned long count)
255 {
256 const unsigned short *sp = src;
257
258 if (platform_outw == __ia64_outw) {
259 volatile unsigned short *addr = __ia64_mk_io_addr(port);
260
261 while (count--)
262 *addr = *sp++;
263 __ia64_mf_a();
264 } else
265 while (count--)
266 platform_outw(*sp++, port);
267 return;
268 }
269
270 static inline void
__outsl(unsigned long port,void * src,unsigned long count)271 __outsl (unsigned long port, void *src, unsigned long count)
272 {
273 const unsigned int *sp = src;
274
275 if (platform_outl == __ia64_outl) {
276 volatile unsigned int *addr = __ia64_mk_io_addr(port);
277
278 while (count--)
279 *addr = *sp++;
280 __ia64_mf_a();
281 } else
282 while (count--)
283 platform_outl(*sp++, port);
284 return;
285 }
286
287 /*
288 * Unfortunately, some platforms are broken and do not follow the IA-64 architecture
289 * specification regarding legacy I/O support. Thus, we have to make these operations
290 * platform dependent...
291 */
292 #define __inb platform_inb
293 #define __inw platform_inw
294 #define __inl platform_inl
295 #define __outb platform_outb
296 #define __outw platform_outw
297 #define __outl platform_outl
298
299 #define inb(p) __inb(p)
300 #define inw(p) __inw(p)
301 #define inl(p) __inl(p)
302 #define insb(p,d,c) __insb(p,d,c)
303 #define insw(p,d,c) __insw(p,d,c)
304 #define insl(p,d,c) __insl(p,d,c)
305 #define outb(v,p) __outb(v,p)
306 #define outw(v,p) __outw(v,p)
307 #define outl(v,p) __outl(v,p)
308 #define outsb(p,s,c) __outsb(p,s,c)
309 #define outsw(p,s,c) __outsw(p,s,c)
310 #define outsl(p,s,c) __outsl(p,s,c)
311
312 /*
313 * The address passed to these functions are ioremap()ped already.
314 */
315 static inline unsigned char
__readb(void * addr)316 __readb (void *addr)
317 {
318 return *(volatile unsigned char *)addr;
319 }
320
321 static inline unsigned short
__readw(void * addr)322 __readw (void *addr)
323 {
324 return *(volatile unsigned short *)addr;
325 }
326
327 static inline unsigned int
__readl(void * addr)328 __readl (void *addr)
329 {
330 return *(volatile unsigned int *) addr;
331 }
332
333 static inline unsigned long
__readq(void * addr)334 __readq (void *addr)
335 {
336 return *(volatile unsigned long *) addr;
337 }
338
339 static inline void
__writeb(unsigned char val,void * addr)340 __writeb (unsigned char val, void *addr)
341 {
342 *(volatile unsigned char *) addr = val;
343 }
344
345 static inline void
__writew(unsigned short val,void * addr)346 __writew (unsigned short val, void *addr)
347 {
348 *(volatile unsigned short *) addr = val;
349 }
350
351 static inline void
__writel(unsigned int val,void * addr)352 __writel (unsigned int val, void *addr)
353 {
354 *(volatile unsigned int *) addr = val;
355 }
356
357 static inline void
__writeq(unsigned long val,void * addr)358 __writeq (unsigned long val, void *addr)
359 {
360 *(volatile unsigned long *) addr = val;
361 }
362
363 #define readb(a) __readb((void *)(a))
364 #define readw(a) __readw((void *)(a))
365 #define readl(a) __readl((void *)(a))
366 #define readq(a) __readq((void *)(a))
367 #define __raw_readb readb
368 #define __raw_readw readw
369 #define __raw_readl readl
370 #define __raw_readq readq
371 #define writeb(v,a) __writeb((v), (void *) (a))
372 #define writew(v,a) __writew((v), (void *) (a))
373 #define writel(v,a) __writel((v), (void *) (a))
374 #define writeq(v,a) __writeq((v), (void *) (a))
375 #define __raw_writeb writeb
376 #define __raw_writew writew
377 #define __raw_writel writel
378 #define __raw_writeq writeq
379
380 #ifndef inb_p
381 # define inb_p inb
382 #endif
383 #ifndef inw_p
384 # define inw_p inw
385 #endif
386 #ifndef inl_p
387 # define inl_p inl
388 #endif
389
390 #ifndef outb_p
391 # define outb_p outb
392 #endif
393 #ifndef outw_p
394 # define outw_p outw
395 #endif
396 #ifndef outl_p
397 # define outl_p outl
398 #endif
399
400 /*
401 * An "address" in IO memory space is not clearly either an integer or a pointer. We will
402 * accept both, thus the casts.
403 *
404 * On ia-64, we access the physical I/O memory space through the uncached kernel region.
405 */
406 static inline void *
ioremap(unsigned long offset,unsigned long size)407 ioremap (unsigned long offset, unsigned long size)
408 {
409 return (void *) (__IA64_UNCACHED_OFFSET | (offset));
410 }
411
412 static inline void
iounmap(void * addr)413 iounmap (void *addr)
414 {
415 }
416
417 #define ioremap_nocache(o,s) ioremap(o,s)
418
419 # ifdef __KERNEL__
420
421 /*
422 * String version of IO memory access ops:
423 */
424 extern void __ia64_memcpy_fromio (void *, unsigned long, long);
425 extern void __ia64_memcpy_toio (unsigned long, void *, long);
426 extern void __ia64_memset_c_io (unsigned long, unsigned long, long);
427
428 #define memcpy_fromio(to,from,len) \
429 __ia64_memcpy_fromio((to),(unsigned long)(from),(len))
430 #define memcpy_toio(to,from,len) \
431 __ia64_memcpy_toio((unsigned long)(to),(from),(len))
432 #define memset_io(addr,c,len) \
433 __ia64_memset_c_io((unsigned long)(addr),0x0101010101010101UL*(u8)(c),(len))
434
435
436 #define dma_cache_inv(_start,_size) do { } while (0)
437 #define dma_cache_wback(_start,_size) do { } while (0)
438 #define dma_cache_wback_inv(_start,_size) do { } while (0)
439
440 # endif /* __KERNEL__ */
441
442 #endif /* _ASM_IA64_IO_H */
443