1 // SPDX-License-Identifier: GPL-2.0
3 * Alpha IO and memory functions.
6 #include <linux/kernel.h>
7 #include <linux/types.h>
8 #include <linux/string.h>
9 #include <linux/module.h>
12 /* Out-of-line versions of the i/o routines that redirect into the
13 platform-specific version. Note that "platform-specific" may mean
14 "generic", which bumps through the machine vector. */
17 ioread8(const void __iomem *addr)
21 ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
26 unsigned int ioread16(const void __iomem *addr)
30 ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
35 unsigned int ioread32(const void __iomem *addr)
39 ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
44 u64 ioread64(const void __iomem *addr)
48 ret = IO_CONCAT(__IO_PREFIX,ioread64)(addr);
53 void iowrite8(u8 b, void __iomem *addr)
56 IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
59 void iowrite16(u16 b, void __iomem *addr)
62 IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
65 void iowrite32(u32 b, void __iomem *addr)
68 IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
71 void iowrite64(u64 b, void __iomem *addr)
74 IO_CONCAT(__IO_PREFIX,iowrite64)(b, addr);
77 EXPORT_SYMBOL(ioread8);
78 EXPORT_SYMBOL(ioread16);
79 EXPORT_SYMBOL(ioread32);
80 EXPORT_SYMBOL(ioread64);
81 EXPORT_SYMBOL(iowrite8);
82 EXPORT_SYMBOL(iowrite16);
83 EXPORT_SYMBOL(iowrite32);
84 EXPORT_SYMBOL(iowrite64);
86 u8 inb(unsigned long port)
88 return ioread8(ioport_map(port, 1));
91 u16 inw(unsigned long port)
93 return ioread16(ioport_map(port, 2));
96 u32 inl(unsigned long port)
98 return ioread32(ioport_map(port, 4));
101 void outb(u8 b, unsigned long port)
103 iowrite8(b, ioport_map(port, 1));
106 void outw(u16 b, unsigned long port)
108 iowrite16(b, ioport_map(port, 2));
111 void outl(u32 b, unsigned long port)
113 iowrite32(b, ioport_map(port, 4));
123 u8 __raw_readb(const volatile void __iomem *addr)
125 return IO_CONCAT(__IO_PREFIX,readb)(addr);
128 u16 __raw_readw(const volatile void __iomem *addr)
130 return IO_CONCAT(__IO_PREFIX,readw)(addr);
133 u32 __raw_readl(const volatile void __iomem *addr)
135 return IO_CONCAT(__IO_PREFIX,readl)(addr);
138 u64 __raw_readq(const volatile void __iomem *addr)
140 return IO_CONCAT(__IO_PREFIX,readq)(addr);
143 void __raw_writeb(u8 b, volatile void __iomem *addr)
145 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
148 void __raw_writew(u16 b, volatile void __iomem *addr)
150 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
153 void __raw_writel(u32 b, volatile void __iomem *addr)
155 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
158 void __raw_writeq(u64 b, volatile void __iomem *addr)
160 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
163 EXPORT_SYMBOL(__raw_readb);
164 EXPORT_SYMBOL(__raw_readw);
165 EXPORT_SYMBOL(__raw_readl);
166 EXPORT_SYMBOL(__raw_readq);
167 EXPORT_SYMBOL(__raw_writeb);
168 EXPORT_SYMBOL(__raw_writew);
169 EXPORT_SYMBOL(__raw_writel);
170 EXPORT_SYMBOL(__raw_writeq);
172 u8 readb(const volatile void __iomem *addr)
176 ret = __raw_readb(addr);
181 u16 readw(const volatile void __iomem *addr)
185 ret = __raw_readw(addr);
190 u32 readl(const volatile void __iomem *addr)
194 ret = __raw_readl(addr);
199 u64 readq(const volatile void __iomem *addr)
203 ret = __raw_readq(addr);
208 void writeb(u8 b, volatile void __iomem *addr)
211 __raw_writeb(b, addr);
214 void writew(u16 b, volatile void __iomem *addr)
217 __raw_writew(b, addr);
220 void writel(u32 b, volatile void __iomem *addr)
223 __raw_writel(b, addr);
226 void writeq(u64 b, volatile void __iomem *addr)
229 __raw_writeq(b, addr);
232 EXPORT_SYMBOL(readb);
233 EXPORT_SYMBOL(readw);
234 EXPORT_SYMBOL(readl);
235 EXPORT_SYMBOL(readq);
236 EXPORT_SYMBOL(writeb);
237 EXPORT_SYMBOL(writew);
238 EXPORT_SYMBOL(writel);
239 EXPORT_SYMBOL(writeq);
242 * The _relaxed functions must be ordered w.r.t. each other, but they don't
243 * have to be ordered w.r.t. other memory accesses.
245 u8 readb_relaxed(const volatile void __iomem *addr)
248 return __raw_readb(addr);
251 u16 readw_relaxed(const volatile void __iomem *addr)
254 return __raw_readw(addr);
257 u32 readl_relaxed(const volatile void __iomem *addr)
260 return __raw_readl(addr);
263 u64 readq_relaxed(const volatile void __iomem *addr)
266 return __raw_readq(addr);
269 EXPORT_SYMBOL(readb_relaxed);
270 EXPORT_SYMBOL(readw_relaxed);
271 EXPORT_SYMBOL(readl_relaxed);
272 EXPORT_SYMBOL(readq_relaxed);
275 * Read COUNT 8-bit bytes from port PORT into memory starting at SRC.
277 void ioread8_rep(const void __iomem *port, void *dst, unsigned long count)
279 while ((unsigned long)dst & 0x3) {
283 *(unsigned char *)dst = ioread8(port);
291 w |= ioread8(port) << 8;
292 w |= ioread8(port) << 16;
293 w |= ioread8(port) << 24;
294 *(unsigned int *)dst = w;
300 *(unsigned char *)dst = ioread8(port);
305 void insb(unsigned long port, void *dst, unsigned long count)
307 ioread8_rep(ioport_map(port, 1), dst, count);
310 EXPORT_SYMBOL(ioread8_rep);
314 * Read COUNT 16-bit words from port PORT into memory starting at
315 * SRC. SRC must be at least short aligned. This is used by the
316 * IDE driver to read disk sectors. Performance is important, but
317 * the interfaces seems to be slow: just using the inlined version
318 * of the inw() breaks things.
320 void ioread16_rep(const void __iomem *port, void *dst, unsigned long count)
322 if (unlikely((unsigned long)dst & 0x3)) {
325 BUG_ON((unsigned long)dst & 0x1);
327 *(unsigned short *)dst = ioread16(port);
335 w |= ioread16(port) << 16;
336 *(unsigned int *)dst = w;
341 *(unsigned short*)dst = ioread16(port);
345 void insw(unsigned long port, void *dst, unsigned long count)
347 ioread16_rep(ioport_map(port, 2), dst, count);
350 EXPORT_SYMBOL(ioread16_rep);
355 * Read COUNT 32-bit words from port PORT into memory starting at
356 * SRC. Now works with any alignment in SRC. Performance is important,
357 * but the interfaces seems to be slow: just using the inlined version
358 * of the inl() breaks things.
360 void ioread32_rep(const void __iomem *port, void *dst, unsigned long count)
362 if (unlikely((unsigned long)dst & 0x3)) {
364 struct S { int x __attribute__((packed)); };
365 ((struct S *)dst)->x = ioread32(port);
369 /* Buffer 32-bit aligned. */
371 *(unsigned int *)dst = ioread32(port);
377 void insl(unsigned long port, void *dst, unsigned long count)
379 ioread32_rep(ioport_map(port, 4), dst, count);
382 EXPORT_SYMBOL(ioread32_rep);
387 * Like insb but in the opposite direction.
388 * Don't worry as much about doing aligned memory transfers:
389 * doing byte reads the "slow" way isn't nearly as slow as
390 * doing byte writes the slow way (no r-m-w cycle).
392 void iowrite8_rep(void __iomem *port, const void *xsrc, unsigned long count)
394 const unsigned char *src = xsrc;
396 iowrite8(*src++, port);
399 void outsb(unsigned long port, const void *src, unsigned long count)
401 iowrite8_rep(ioport_map(port, 1), src, count);
404 EXPORT_SYMBOL(iowrite8_rep);
405 EXPORT_SYMBOL(outsb);
409 * Like insw but in the opposite direction. This is used by the IDE
410 * driver to write disk sectors. Performance is important, but the
411 * interfaces seems to be slow: just using the inlined version of the
412 * outw() breaks things.
414 void iowrite16_rep(void __iomem *port, const void *src, unsigned long count)
416 if (unlikely((unsigned long)src & 0x3)) {
419 BUG_ON((unsigned long)src & 0x1);
420 iowrite16(*(unsigned short *)src, port);
428 w = *(unsigned int *)src;
430 iowrite16(w >> 0, port);
431 iowrite16(w >> 16, port);
435 iowrite16(*(unsigned short *)src, port);
439 void outsw(unsigned long port, const void *src, unsigned long count)
441 iowrite16_rep(ioport_map(port, 2), src, count);
444 EXPORT_SYMBOL(iowrite16_rep);
445 EXPORT_SYMBOL(outsw);
449 * Like insl but in the opposite direction. This is used by the IDE
450 * driver to write disk sectors. Works with any alignment in SRC.
451 * Performance is important, but the interfaces seems to be slow:
452 * just using the inlined version of the outl() breaks things.
454 void iowrite32_rep(void __iomem *port, const void *src, unsigned long count)
456 if (unlikely((unsigned long)src & 0x3)) {
458 struct S { int x __attribute__((packed)); };
459 iowrite32(((struct S *)src)->x, port);
463 /* Buffer 32-bit aligned. */
465 iowrite32(*(unsigned int *)src, port);
471 void outsl(unsigned long port, const void *src, unsigned long count)
473 iowrite32_rep(ioport_map(port, 4), src, count);
476 EXPORT_SYMBOL(iowrite32_rep);
477 EXPORT_SYMBOL(outsl);
481 * Copy data from IO memory space to "real" memory space.
482 * This needs to be optimized.
484 void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
486 /* Optimize co-aligned transfers. Everything else gets handled
489 if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
492 *(u64 *)to = __raw_readq(from);
496 } while (count >= 0);
500 if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
503 *(u32 *)to = __raw_readl(from);
507 } while (count >= 0);
511 if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
514 *(u16 *)to = __raw_readw(from);
518 } while (count >= 0);
523 *(u8 *) to = __raw_readb(from);
531 EXPORT_SYMBOL(memcpy_fromio);
535 * Copy data from "real" memory space to IO memory space.
536 * This needs to be optimized.
538 void memcpy_toio(volatile void __iomem *to, const void *from, long count)
540 /* Optimize co-aligned transfers. Everything else gets handled
542 /* FIXME -- align FROM. */
544 if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
547 __raw_writeq(*(const u64 *)from, to);
551 } while (count >= 0);
555 if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
558 __raw_writel(*(const u32 *)from, to);
562 } while (count >= 0);
566 if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
569 __raw_writew(*(const u16 *)from, to);
573 } while (count >= 0);
578 __raw_writeb(*(const u8 *) from, to);
586 EXPORT_SYMBOL(memcpy_toio);
590 * "memset" on IO memory space.
592 void _memset_c_io(volatile void __iomem *to, unsigned long c, long count)
594 /* Handle any initial odd byte */
595 if (count > 0 && ((u64)to & 1)) {
601 /* Handle any initial odd halfword */
602 if (count >= 2 && ((u64)to & 2)) {
608 /* Handle any initial odd word */
609 if (count >= 4 && ((u64)to & 4)) {
615 /* Handle all full-sized quadwords: we're aligned
616 (or have a small count) */
623 } while (count >= 0);
627 /* The tail is word-aligned if we still have count >= 4 */
634 /* The tail is half-word aligned if we have count >= 2 */
641 /* And finally, one last byte.. */
648 EXPORT_SYMBOL(_memset_c_io);
650 /* A version of memcpy used by the vga console routines to move data around
651 arbitrarily between screen and main memory. */
654 scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
656 const u16 __iomem *ios = (const u16 __iomem *) s;
657 u16 __iomem *iod = (u16 __iomem *) d;
658 int s_isio = __is_ioaddr(s);
659 int d_isio = __is_ioaddr(d);
663 /* FIXME: Should handle unaligned ops and
664 operation widening. */
668 u16 tmp = __raw_readw(ios++);
669 __raw_writew(tmp, iod++);
673 memcpy_fromio(d, ios, count);
676 memcpy_toio(iod, s, count);
682 EXPORT_SYMBOL(scr_memcpyw);
684 void __iomem *ioport_map(unsigned long port, unsigned int size)
686 return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
689 void ioport_unmap(void __iomem *addr)
693 EXPORT_SYMBOL(ioport_map);
694 EXPORT_SYMBOL(ioport_unmap);