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(void __iomem *addr)
19 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
24 unsigned int ioread16(void __iomem *addr)
26 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
31 unsigned int ioread32(void __iomem *addr)
33 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
38 void iowrite8(u8 b, void __iomem *addr)
40 IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
44 void iowrite16(u16 b, void __iomem *addr)
46 IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
50 void iowrite32(u32 b, void __iomem *addr)
52 IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
56 EXPORT_SYMBOL(ioread8);
57 EXPORT_SYMBOL(ioread16);
58 EXPORT_SYMBOL(ioread32);
59 EXPORT_SYMBOL(iowrite8);
60 EXPORT_SYMBOL(iowrite16);
61 EXPORT_SYMBOL(iowrite32);
63 u8 inb(unsigned long port)
65 return ioread8(ioport_map(port, 1));
68 u16 inw(unsigned long port)
70 return ioread16(ioport_map(port, 2));
73 u32 inl(unsigned long port)
75 return ioread32(ioport_map(port, 4));
78 void outb(u8 b, unsigned long port)
80 iowrite8(b, ioport_map(port, 1));
83 void outw(u16 b, unsigned long port)
85 iowrite16(b, ioport_map(port, 2));
88 void outl(u32 b, unsigned long port)
90 iowrite32(b, ioport_map(port, 4));
100 u8 __raw_readb(const volatile void __iomem *addr)
102 return IO_CONCAT(__IO_PREFIX,readb)(addr);
105 u16 __raw_readw(const volatile void __iomem *addr)
107 return IO_CONCAT(__IO_PREFIX,readw)(addr);
110 u32 __raw_readl(const volatile void __iomem *addr)
112 return IO_CONCAT(__IO_PREFIX,readl)(addr);
115 u64 __raw_readq(const volatile void __iomem *addr)
117 return IO_CONCAT(__IO_PREFIX,readq)(addr);
120 void __raw_writeb(u8 b, volatile void __iomem *addr)
122 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
125 void __raw_writew(u16 b, volatile void __iomem *addr)
127 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
130 void __raw_writel(u32 b, volatile void __iomem *addr)
132 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
135 void __raw_writeq(u64 b, volatile void __iomem *addr)
137 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
140 EXPORT_SYMBOL(__raw_readb);
141 EXPORT_SYMBOL(__raw_readw);
142 EXPORT_SYMBOL(__raw_readl);
143 EXPORT_SYMBOL(__raw_readq);
144 EXPORT_SYMBOL(__raw_writeb);
145 EXPORT_SYMBOL(__raw_writew);
146 EXPORT_SYMBOL(__raw_writel);
147 EXPORT_SYMBOL(__raw_writeq);
149 u8 readb(const volatile void __iomem *addr)
151 u8 ret = __raw_readb(addr);
156 u16 readw(const volatile void __iomem *addr)
158 u16 ret = __raw_readw(addr);
163 u32 readl(const volatile void __iomem *addr)
165 u32 ret = __raw_readl(addr);
170 u64 readq(const volatile void __iomem *addr)
172 u64 ret = __raw_readq(addr);
177 void writeb(u8 b, volatile void __iomem *addr)
179 __raw_writeb(b, addr);
183 void writew(u16 b, volatile void __iomem *addr)
185 __raw_writew(b, addr);
189 void writel(u32 b, volatile void __iomem *addr)
191 __raw_writel(b, addr);
195 void writeq(u64 b, volatile void __iomem *addr)
197 __raw_writeq(b, addr);
201 EXPORT_SYMBOL(readb);
202 EXPORT_SYMBOL(readw);
203 EXPORT_SYMBOL(readl);
204 EXPORT_SYMBOL(readq);
205 EXPORT_SYMBOL(writeb);
206 EXPORT_SYMBOL(writew);
207 EXPORT_SYMBOL(writel);
208 EXPORT_SYMBOL(writeq);
212 * Read COUNT 8-bit bytes from port PORT into memory starting at SRC.
214 void ioread8_rep(void __iomem *port, void *dst, unsigned long count)
216 while ((unsigned long)dst & 0x3) {
220 *(unsigned char *)dst = ioread8(port);
228 w |= ioread8(port) << 8;
229 w |= ioread8(port) << 16;
230 w |= ioread8(port) << 24;
231 *(unsigned int *)dst = w;
237 *(unsigned char *)dst = ioread8(port);
242 void insb(unsigned long port, void *dst, unsigned long count)
244 ioread8_rep(ioport_map(port, 1), dst, count);
247 EXPORT_SYMBOL(ioread8_rep);
251 * Read COUNT 16-bit words from port PORT into memory starting at
252 * SRC. SRC must be at least short aligned. This is used by the
253 * IDE driver to read disk sectors. Performance is important, but
254 * the interfaces seems to be slow: just using the inlined version
255 * of the inw() breaks things.
257 void ioread16_rep(void __iomem *port, void *dst, unsigned long count)
259 if (unlikely((unsigned long)dst & 0x3)) {
262 BUG_ON((unsigned long)dst & 0x1);
264 *(unsigned short *)dst = ioread16(port);
272 w |= ioread16(port) << 16;
273 *(unsigned int *)dst = w;
278 *(unsigned short*)dst = ioread16(port);
282 void insw(unsigned long port, void *dst, unsigned long count)
284 ioread16_rep(ioport_map(port, 2), dst, count);
287 EXPORT_SYMBOL(ioread16_rep);
292 * Read COUNT 32-bit words from port PORT into memory starting at
293 * SRC. Now works with any alignment in SRC. Performance is important,
294 * but the interfaces seems to be slow: just using the inlined version
295 * of the inl() breaks things.
297 void ioread32_rep(void __iomem *port, void *dst, unsigned long count)
299 if (unlikely((unsigned long)dst & 0x3)) {
301 struct S { int x __attribute__((packed)); };
302 ((struct S *)dst)->x = ioread32(port);
306 /* Buffer 32-bit aligned. */
308 *(unsigned int *)dst = ioread32(port);
314 void insl(unsigned long port, void *dst, unsigned long count)
316 ioread32_rep(ioport_map(port, 4), dst, count);
319 EXPORT_SYMBOL(ioread32_rep);
324 * Like insb but in the opposite direction.
325 * Don't worry as much about doing aligned memory transfers:
326 * doing byte reads the "slow" way isn't nearly as slow as
327 * doing byte writes the slow way (no r-m-w cycle).
329 void iowrite8_rep(void __iomem *port, const void *xsrc, unsigned long count)
331 const unsigned char *src = xsrc;
333 iowrite8(*src++, port);
336 void outsb(unsigned long port, const void *src, unsigned long count)
338 iowrite8_rep(ioport_map(port, 1), src, count);
341 EXPORT_SYMBOL(iowrite8_rep);
342 EXPORT_SYMBOL(outsb);
346 * Like insw but in the opposite direction. This is used by the IDE
347 * driver to write disk sectors. Performance is important, but the
348 * interfaces seems to be slow: just using the inlined version of the
349 * outw() breaks things.
351 void iowrite16_rep(void __iomem *port, const void *src, unsigned long count)
353 if (unlikely((unsigned long)src & 0x3)) {
356 BUG_ON((unsigned long)src & 0x1);
357 iowrite16(*(unsigned short *)src, port);
365 w = *(unsigned int *)src;
367 iowrite16(w >> 0, port);
368 iowrite16(w >> 16, port);
372 iowrite16(*(unsigned short *)src, port);
376 void outsw(unsigned long port, const void *src, unsigned long count)
378 iowrite16_rep(ioport_map(port, 2), src, count);
381 EXPORT_SYMBOL(iowrite16_rep);
382 EXPORT_SYMBOL(outsw);
386 * Like insl but in the opposite direction. This is used by the IDE
387 * driver to write disk sectors. Works with any alignment in SRC.
388 * Performance is important, but the interfaces seems to be slow:
389 * just using the inlined version of the outl() breaks things.
391 void iowrite32_rep(void __iomem *port, const void *src, unsigned long count)
393 if (unlikely((unsigned long)src & 0x3)) {
395 struct S { int x __attribute__((packed)); };
396 iowrite32(((struct S *)src)->x, port);
400 /* Buffer 32-bit aligned. */
402 iowrite32(*(unsigned int *)src, port);
408 void outsl(unsigned long port, const void *src, unsigned long count)
410 iowrite32_rep(ioport_map(port, 4), src, count);
413 EXPORT_SYMBOL(iowrite32_rep);
414 EXPORT_SYMBOL(outsl);
418 * Copy data from IO memory space to "real" memory space.
419 * This needs to be optimized.
421 void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
423 /* Optimize co-aligned transfers. Everything else gets handled
426 if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
429 *(u64 *)to = __raw_readq(from);
433 } while (count >= 0);
437 if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
440 *(u32 *)to = __raw_readl(from);
444 } while (count >= 0);
448 if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
451 *(u16 *)to = __raw_readw(from);
455 } while (count >= 0);
460 *(u8 *) to = __raw_readb(from);
468 EXPORT_SYMBOL(memcpy_fromio);
472 * Copy data from "real" memory space to IO memory space.
473 * This needs to be optimized.
475 void memcpy_toio(volatile void __iomem *to, const void *from, long count)
477 /* Optimize co-aligned transfers. Everything else gets handled
479 /* FIXME -- align FROM. */
481 if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
484 __raw_writeq(*(const u64 *)from, to);
488 } while (count >= 0);
492 if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
495 __raw_writel(*(const u32 *)from, to);
499 } while (count >= 0);
503 if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
506 __raw_writew(*(const u16 *)from, to);
510 } while (count >= 0);
515 __raw_writeb(*(const u8 *) from, to);
523 EXPORT_SYMBOL(memcpy_toio);
527 * "memset" on IO memory space.
529 void _memset_c_io(volatile void __iomem *to, unsigned long c, long count)
531 /* Handle any initial odd byte */
532 if (count > 0 && ((u64)to & 1)) {
538 /* Handle any initial odd halfword */
539 if (count >= 2 && ((u64)to & 2)) {
545 /* Handle any initial odd word */
546 if (count >= 4 && ((u64)to & 4)) {
552 /* Handle all full-sized quadwords: we're aligned
553 (or have a small count) */
560 } while (count >= 0);
564 /* The tail is word-aligned if we still have count >= 4 */
571 /* The tail is half-word aligned if we have count >= 2 */
578 /* And finally, one last byte.. */
585 EXPORT_SYMBOL(_memset_c_io);
587 /* A version of memcpy used by the vga console routines to move data around
588 arbitrarily between screen and main memory. */
591 scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
593 const u16 __iomem *ios = (const u16 __iomem *) s;
594 u16 __iomem *iod = (u16 __iomem *) d;
595 int s_isio = __is_ioaddr(s);
596 int d_isio = __is_ioaddr(d);
600 /* FIXME: Should handle unaligned ops and
601 operation widening. */
605 u16 tmp = __raw_readw(ios++);
606 __raw_writew(tmp, iod++);
610 memcpy_fromio(d, ios, count);
613 memcpy_toio(iod, s, count);
619 EXPORT_SYMBOL(scr_memcpyw);
621 void __iomem *ioport_map(unsigned long port, unsigned int size)
623 return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
626 void ioport_unmap(void __iomem *addr)
630 EXPORT_SYMBOL(ioport_map);
631 EXPORT_SYMBOL(ioport_unmap);