1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __ALPHA_IO_H
3 #define __ALPHA_IO_H
4
5 #ifdef __KERNEL__
6
7 #include <linux/kernel.h>
8 #include <linux/mm.h>
9 #include <asm/compiler.h>
10 #include <asm/machvec.h>
11 #include <asm/hwrpb.h>
12
13 /* The generic header contains only prototypes. Including it ensures that
14 the implementation we have here matches that interface. */
15 #include <asm-generic/iomap.h>
16
17 /*
18 * Virtual -> physical identity mapping starts at this offset
19 */
20 #ifdef USE_48_BIT_KSEG
21 #define IDENT_ADDR 0xffff800000000000UL
22 #else
23 #define IDENT_ADDR 0xfffffc0000000000UL
24 #endif
25
26 /*
27 * We try to avoid hae updates (thus the cache), but when we
28 * do need to update the hae, we need to do it atomically, so
29 * that any interrupts wouldn't get confused with the hae
30 * register not being up-to-date with respect to the hardware
31 * value.
32 */
33 extern inline void __set_hae(unsigned long new_hae)
34 {
35 unsigned long flags = swpipl(IPL_MAX);
36
37 barrier();
38
39 alpha_mv.hae_cache = new_hae;
40 *alpha_mv.hae_register = new_hae;
41 mb();
42 /* Re-read to make sure it was written. */
43 new_hae = *alpha_mv.hae_register;
44
45 setipl(flags);
46 barrier();
47 }
48
49 extern inline void set_hae(unsigned long new_hae)
50 {
51 if (new_hae != alpha_mv.hae_cache)
52 __set_hae(new_hae);
53 }
54
55 /*
56 * Change virtual addresses to physical addresses and vv.
57 */
58 #ifdef USE_48_BIT_KSEG
59 static inline unsigned long virt_to_phys(volatile void *address)
60 {
61 return (unsigned long)address - IDENT_ADDR;
62 }
63
64 static inline void * phys_to_virt(unsigned long address)
65 {
66 return (void *) (address + IDENT_ADDR);
67 }
68 #else
69 static inline unsigned long virt_to_phys(volatile void *address)
70 {
71 unsigned long phys = (unsigned long)address;
72
73 /* Sign-extend from bit 41. */
74 phys <<= (64 - 41);
75 phys = (long)phys >> (64 - 41);
76
77 /* Crop to the physical address width of the processor. */
78 phys &= (1ul << hwrpb->pa_bits) - 1;
79
80 return phys;
81 }
82
83 static inline void * phys_to_virt(unsigned long address)
84 {
85 return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1)));
86 }
87 #endif
88
89 #define virt_to_phys virt_to_phys
90 #define phys_to_virt phys_to_virt
91 #define page_to_phys(page) page_to_pa(page)
92
93 /* Maximum PIO space address supported? */
94 #define IO_SPACE_LIMIT 0xffff
95
96 /*
97 * Change addresses as seen by the kernel (virtual) to addresses as
98 * seen by a device (bus), and vice versa.
99 *
100 * Note that this only works for a limited range of kernel addresses,
101 * and very well may not span all memory. Consider this interface
102 * deprecated in favour of the DMA-mapping API.
103 */
104 extern unsigned long __direct_map_base;
105 extern unsigned long __direct_map_size;
106
107 static inline unsigned long __deprecated isa_virt_to_bus(volatile void *address)
108 {
109 unsigned long phys = virt_to_phys(address);
110 unsigned long bus = phys + __direct_map_base;
111 return phys <= __direct_map_size ? bus : 0;
112 }
113 #define isa_virt_to_bus isa_virt_to_bus
114
115 static inline void * __deprecated isa_bus_to_virt(unsigned long address)
116 {
117 void *virt;
118
119 /* This check is a sanity check but also ensures that bus address 0
120 maps to virtual address 0 which is useful to detect null pointers
121 (the NCR driver is much simpler if NULL pointers are preserved). */
122 address -= __direct_map_base;
123 virt = phys_to_virt(address);
124 return (long)address <= 0 ? NULL : virt;
125 }
126 #define isa_bus_to_virt isa_bus_to_virt
127
128 /*
129 * There are different chipsets to interface the Alpha CPUs to the world.
130 */
131
132 #define IO_CONCAT(a,b) _IO_CONCAT(a,b)
133 #define _IO_CONCAT(a,b) a ## _ ## b
134
135 #ifdef CONFIG_ALPHA_GENERIC
136
137 /* In a generic kernel, we always go through the machine vector. */
138
139 #define REMAP1(TYPE, NAME, QUAL) \
140 static inline TYPE generic_##NAME(QUAL void __iomem *addr) \
141 { \
142 return alpha_mv.mv_##NAME(addr); \
143 }
144
145 #define REMAP2(TYPE, NAME, QUAL) \
146 static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \
147 { \
148 alpha_mv.mv_##NAME(b, addr); \
149 }
150
151 REMAP1(unsigned int, ioread8, const)
152 REMAP1(unsigned int, ioread16, const)
153 REMAP1(unsigned int, ioread32, const)
154 REMAP1(u64, ioread64, const)
155 REMAP1(u8, readb, const volatile)
156 REMAP1(u16, readw, const volatile)
157 REMAP1(u32, readl, const volatile)
158 REMAP1(u64, readq, const volatile)
159
160 REMAP2(u8, iowrite8, /**/)
161 REMAP2(u16, iowrite16, /**/)
162 REMAP2(u32, iowrite32, /**/)
163 REMAP2(u64, iowrite64, /**/)
164 REMAP2(u8, writeb, volatile)
165 REMAP2(u16, writew, volatile)
166 REMAP2(u32, writel, volatile)
167 REMAP2(u64, writeq, volatile)
168
169 #undef REMAP1
170 #undef REMAP2
171
172 extern inline void __iomem *generic_ioportmap(unsigned long a)
173 {
174 return alpha_mv.mv_ioportmap(a);
175 }
176
177 static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s)
178 {
179 return alpha_mv.mv_ioremap(a, s);
180 }
181
182 static inline void generic_iounmap(volatile void __iomem *a)
183 {
184 return alpha_mv.mv_iounmap(a);
185 }
186
187 static inline int generic_is_ioaddr(unsigned long a)
188 {
189 return alpha_mv.mv_is_ioaddr(a);
190 }
191
192 static inline int generic_is_mmio(const volatile void __iomem *a)
193 {
194 return alpha_mv.mv_is_mmio(a);
195 }
196
197 #define __IO_PREFIX generic
198 #define generic_trivial_rw_bw 0
199 #define generic_trivial_rw_lq 0
200 #define generic_trivial_io_bw 0
201 #define generic_trivial_io_lq 0
202 #define generic_trivial_iounmap 0
203
204 #else
205
206 #if defined(CONFIG_ALPHA_CIA)
207 # include <asm/core_cia.h>
208 #elif defined(CONFIG_ALPHA_IRONGATE)
209 # include <asm/core_irongate.h>
210 #elif defined(CONFIG_ALPHA_MARVEL)
211 # include <asm/core_marvel.h>
212 #elif defined(CONFIG_ALPHA_MCPCIA)
213 # include <asm/core_mcpcia.h>
214 #elif defined(CONFIG_ALPHA_POLARIS)
215 # include <asm/core_polaris.h>
216 #elif defined(CONFIG_ALPHA_T2)
217 # include <asm/core_t2.h>
218 #elif defined(CONFIG_ALPHA_TSUNAMI)
219 # include <asm/core_tsunami.h>
220 #elif defined(CONFIG_ALPHA_TITAN)
221 # include <asm/core_titan.h>
222 #elif defined(CONFIG_ALPHA_WILDFIRE)
223 # include <asm/core_wildfire.h>
224 #else
225 #error "What system is this?"
226 #endif
227
228 #endif /* GENERIC */
229
230 /*
231 * We always have external versions of these routines.
232 */
233 extern u8 inb(unsigned long port);
234 extern u16 inw(unsigned long port);
235 extern u32 inl(unsigned long port);
236 extern void outb(u8 b, unsigned long port);
237 extern void outw(u16 b, unsigned long port);
238 extern void outl(u32 b, unsigned long port);
239 #define inb inb
240 #define inw inw
241 #define inl inl
242 #define outb outb
243 #define outw outw
244 #define outl outl
245
246 extern u8 readb(const volatile void __iomem *addr);
247 extern u16 readw(const volatile void __iomem *addr);
248 extern u32 readl(const volatile void __iomem *addr);
249 extern u64 readq(const volatile void __iomem *addr);
250 extern void writeb(u8 b, volatile void __iomem *addr);
251 extern void writew(u16 b, volatile void __iomem *addr);
252 extern void writel(u32 b, volatile void __iomem *addr);
253 extern void writeq(u64 b, volatile void __iomem *addr);
254 #define readb readb
255 #define readw readw
256 #define readl readl
257 #define readq readq
258 #define writeb writeb
259 #define writew writew
260 #define writel writel
261 #define writeq writeq
262
263 extern u8 __raw_readb(const volatile void __iomem *addr);
264 extern u16 __raw_readw(const volatile void __iomem *addr);
265 extern u32 __raw_readl(const volatile void __iomem *addr);
266 extern u64 __raw_readq(const volatile void __iomem *addr);
267 extern void __raw_writeb(u8 b, volatile void __iomem *addr);
268 extern void __raw_writew(u16 b, volatile void __iomem *addr);
269 extern void __raw_writel(u32 b, volatile void __iomem *addr);
270 extern void __raw_writeq(u64 b, volatile void __iomem *addr);
271 #define __raw_readb __raw_readb
272 #define __raw_readw __raw_readw
273 #define __raw_readl __raw_readl
274 #define __raw_readq __raw_readq
275 #define __raw_writeb __raw_writeb
276 #define __raw_writew __raw_writew
277 #define __raw_writel __raw_writel
278 #define __raw_writeq __raw_writeq
279
280 /*
281 * Mapping from port numbers to __iomem space is pretty easy.
282 */
283
284 /* These two have to be extern inline because of the extern prototype from
285 <asm-generic/iomap.h>. It is not legal to mix "extern" and "static" for
286 the same declaration. */
287 extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
288 {
289 return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
290 }
291
292 extern inline void ioport_unmap(void __iomem *addr)
293 {
294 }
295
296 #define ioport_map ioport_map
297 #define ioport_unmap ioport_unmap
298
299 static inline void __iomem *ioremap(unsigned long port, unsigned long size)
300 {
301 return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
302 }
303
304 #define ioremap_wc ioremap
305
306 static inline void iounmap(volatile void __iomem *addr)
307 {
308 IO_CONCAT(__IO_PREFIX,iounmap)(addr);
309 }
310
311 static inline int __is_ioaddr(unsigned long addr)
312 {
313 return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
314 }
315 #define __is_ioaddr(a) __is_ioaddr((unsigned long)(a))
316
317 static inline int __is_mmio(const volatile void __iomem *addr)
318 {
319 return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
320 }
321
322
323 /*
324 * If the actual I/O bits are sufficiently trivial, then expand inline.
325 */
326
327 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
328 extern inline unsigned int ioread8(const void __iomem *addr)
329 {
330 unsigned int ret;
331 mb();
332 ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
333 mb();
334 return ret;
335 }
336
337 extern inline unsigned int ioread16(const void __iomem *addr)
338 {
339 unsigned int ret;
340 mb();
341 ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
342 mb();
343 return ret;
344 }
345
346 extern inline void iowrite8(u8 b, void __iomem *addr)
347 {
348 mb();
349 IO_CONCAT(__IO_PREFIX, iowrite8)(b, addr);
350 }
351
352 extern inline void iowrite16(u16 b, void __iomem *addr)
353 {
354 mb();
355 IO_CONCAT(__IO_PREFIX, iowrite16)(b, addr);
356 }
357
358 extern inline u8 inb(unsigned long port)
359 {
360 return ioread8(ioport_map(port, 1));
361 }
362
363 extern inline u16 inw(unsigned long port)
364 {
365 return ioread16(ioport_map(port, 2));
366 }
367
368 extern inline void outb(u8 b, unsigned long port)
369 {
370 iowrite8(b, ioport_map(port, 1));
371 }
372
373 extern inline void outw(u16 b, unsigned long port)
374 {
375 iowrite16(b, ioport_map(port, 2));
376 }
377 #endif
378
379 #define ioread8 ioread8
380 #define ioread16 ioread16
381 #define iowrite8 iowrite8
382 #define iowrite16 iowrite16
383
384 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
385 extern inline unsigned int ioread32(const void __iomem *addr)
386 {
387 unsigned int ret;
388 mb();
389 ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
390 mb();
391 return ret;
392 }
393
394 extern inline u64 ioread64(const void __iomem *addr)
395 {
396 unsigned int ret;
397 mb();
398 ret = IO_CONCAT(__IO_PREFIX,ioread64)(addr);
399 mb();
400 return ret;
401 }
402
403 extern inline void iowrite32(u32 b, void __iomem *addr)
404 {
405 mb();
406 IO_CONCAT(__IO_PREFIX, iowrite32)(b, addr);
407 }
408
409 extern inline void iowrite64(u64 b, void __iomem *addr)
410 {
411 mb();
412 IO_CONCAT(__IO_PREFIX, iowrite64)(b, addr);
413 }
414
415 extern inline u32 inl(unsigned long port)
416 {
417 return ioread32(ioport_map(port, 4));
418 }
419
420 extern inline void outl(u32 b, unsigned long port)
421 {
422 iowrite32(b, ioport_map(port, 4));
423 }
424 #endif
425
426 #define ioread32 ioread32
427 #define ioread64 ioread64
428 #define iowrite32 iowrite32
429 #define iowrite64 iowrite64
430
431 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
432 extern inline u8 __raw_readb(const volatile void __iomem *addr)
433 {
434 return IO_CONCAT(__IO_PREFIX,readb)(addr);
435 }
436
437 extern inline u16 __raw_readw(const volatile void __iomem *addr)
438 {
439 return IO_CONCAT(__IO_PREFIX,readw)(addr);
440 }
441
442 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
443 {
444 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
445 }
446
447 extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
448 {
449 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
450 }
451
452 extern inline u8 readb(const volatile void __iomem *addr)
453 {
454 u8 ret;
455 mb();
456 ret = __raw_readb(addr);
457 mb();
458 return ret;
459 }
460
461 extern inline u16 readw(const volatile void __iomem *addr)
462 {
463 u16 ret;
464 mb();
465 ret = __raw_readw(addr);
466 mb();
467 return ret;
468 }
469
470 extern inline void writeb(u8 b, volatile void __iomem *addr)
471 {
472 mb();
473 __raw_writeb(b, addr);
474 }
475
476 extern inline void writew(u16 b, volatile void __iomem *addr)
477 {
478 mb();
479 __raw_writew(b, addr);
480 }
481 #endif
482
483 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
484 extern inline u32 __raw_readl(const volatile void __iomem *addr)
485 {
486 return IO_CONCAT(__IO_PREFIX,readl)(addr);
487 }
488
489 extern inline u64 __raw_readq(const volatile void __iomem *addr)
490 {
491 return IO_CONCAT(__IO_PREFIX,readq)(addr);
492 }
493
494 extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
495 {
496 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
497 }
498
499 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
500 {
501 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
502 }
503
504 extern inline u32 readl(const volatile void __iomem *addr)
505 {
506 u32 ret;
507 mb();
508 ret = __raw_readl(addr);
509 mb();
510 return ret;
511 }
512
513 extern inline u64 readq(const volatile void __iomem *addr)
514 {
515 u64 ret;
516 mb();
517 ret = __raw_readq(addr);
518 mb();
519 return ret;
520 }
521
522 extern inline void writel(u32 b, volatile void __iomem *addr)
523 {
524 mb();
525 __raw_writel(b, addr);
526 }
527
528 extern inline void writeq(u64 b, volatile void __iomem *addr)
529 {
530 mb();
531 __raw_writeq(b, addr);
532 }
533 #endif
534
535 #define ioread16be(p) swab16(ioread16(p))
536 #define ioread32be(p) swab32(ioread32(p))
537 #define ioread64be(p) swab64(ioread64(p))
538 #define iowrite16be(v,p) iowrite16(swab16(v), (p))
539 #define iowrite32be(v,p) iowrite32(swab32(v), (p))
540 #define iowrite64be(v,p) iowrite64(swab64(v), (p))
541
542 #define inb_p inb
543 #define inw_p inw
544 #define inl_p inl
545 #define outb_p outb
546 #define outw_p outw
547 #define outl_p outl
548
549 extern u8 readb_relaxed(const volatile void __iomem *addr);
550 extern u16 readw_relaxed(const volatile void __iomem *addr);
551 extern u32 readl_relaxed(const volatile void __iomem *addr);
552 extern u64 readq_relaxed(const volatile void __iomem *addr);
553 #define readb_relaxed readb_relaxed
554 #define readw_relaxed readw_relaxed
555 #define readl_relaxed readl_relaxed
556 #define readq_relaxed readq_relaxed
557
558 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
559 extern inline u8 readb_relaxed(const volatile void __iomem *addr)
560 {
561 mb();
562 return __raw_readb(addr);
563 }
564
565 extern inline u16 readw_relaxed(const volatile void __iomem *addr)
566 {
567 mb();
568 return __raw_readw(addr);
569 }
570 #endif
571
572 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
573 extern inline u32 readl_relaxed(const volatile void __iomem *addr)
574 {
575 mb();
576 return __raw_readl(addr);
577 }
578
579 extern inline u64 readq_relaxed(const volatile void __iomem *addr)
580 {
581 mb();
582 return __raw_readq(addr);
583 }
584 #endif
585
586 #define writeb_relaxed writeb
587 #define writew_relaxed writew
588 #define writel_relaxed writel
589 #define writeq_relaxed writeq
590
591 /*
592 * String version of IO memory access ops:
593 */
594 extern void memcpy_fromio(void *, const volatile void __iomem *, long);
595 extern void memcpy_toio(volatile void __iomem *, const void *, long);
596 extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
597
598 static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
599 {
600 _memset_c_io(addr, 0x0101010101010101UL * c, len);
601 }
602
603 #define __HAVE_ARCH_MEMSETW_IO
604 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
605 {
606 _memset_c_io(addr, 0x0001000100010001UL * c, len);
607 }
608
609 #define memset_io memset_io
610 #define memcpy_fromio memcpy_fromio
611 #define memcpy_toio memcpy_toio
612
613 /*
614 * String versions of in/out ops:
615 */
616 extern void insb (unsigned long port, void *dst, unsigned long count);
617 extern void insw (unsigned long port, void *dst, unsigned long count);
618 extern void insl (unsigned long port, void *dst, unsigned long count);
619 extern void outsb (unsigned long port, const void *src, unsigned long count);
620 extern void outsw (unsigned long port, const void *src, unsigned long count);
621 extern void outsl (unsigned long port, const void *src, unsigned long count);
622
623 #define insb insb
624 #define insw insw
625 #define insl insl
626 #define outsb outsb
627 #define outsw outsw
628 #define outsl outsl
629
630 #define RTC_PORT(x) (0x70 + (x))
631 #define RTC_ALWAYS_BCD 0
632
633 /*
634 * These get provided from <asm-generic/iomap.h> since alpha does not
635 * select GENERIC_IOMAP.
636 */
637 #define ioread64 ioread64
638 #define iowrite64 iowrite64
639 #define ioread8_rep ioread8_rep
640 #define ioread16_rep ioread16_rep
641 #define ioread32_rep ioread32_rep
642 #define iowrite8_rep iowrite8_rep
643 #define iowrite16_rep iowrite16_rep
644 #define iowrite32_rep iowrite32_rep
645 #define pci_iounmap pci_iounmap
646
647 #include <asm-generic/io.h>
648
649 #endif /* __KERNEL__ */
650
651 #endif /* __ALPHA_IO_H */
652
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