1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (c) Matthew Wilcox 2001 for Hewlett-Packard
17 ** Assumes the device can cope with 32-bit transfers.  If it can't,
26 **	TODO: only look at src alignment and adjust the stores to dest.
28 void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)  in memcpy_fromio()  argument
30 	/* first compare alignment of src/dst */   in memcpy_fromio()
31 	if ( (((unsigned long)dst ^ (unsigned long)src) & 1) || (count < 2) )  in memcpy_fromio()
34 	if ( (((unsigned long)dst ^ (unsigned long)src) & 2) || (count < 4) )  in memcpy_fromio()
38 	if ((unsigned long)src & 1) {  in memcpy_fromio()
39 		*(u8 *)dst = readb(src);  in memcpy_fromio()
40 		src++;  in memcpy_fromio()
42 		count--;  in memcpy_fromio()
43 		if (count < 2) goto bytecopy;  in memcpy_fromio()
46 	if ((unsigned long)src & 2) {  in memcpy_fromio()
47 		*(u16 *)dst = __raw_readw(src);  in memcpy_fromio()
48 		src += 2;  in memcpy_fromio()
49 		dst += 2;  in memcpy_fromio()
50 		count -= 2;  in memcpy_fromio()
54 		*(u32 *)dst = __raw_readl(src);  in memcpy_fromio()
56 		src += 4;  in memcpy_fromio()
57 		count -= 4;  in memcpy_fromio()
62 		*(u16 *)dst = __raw_readw(src);  in memcpy_fromio()
63 		src += 2;  in memcpy_fromio()
64 		dst += 2;  in memcpy_fromio()
65 		count -= 2;  in memcpy_fromio()
69 	while (count--) {  in memcpy_fromio()
70 		*(char *)dst = readb(src);  in memcpy_fromio()
71 		src++;  in memcpy_fromio()
77  * Read COUNT 8-bit bytes from port PORT into memory starting at
78  * SRC.
89 		count--;  in insb()
96 		count -= 4;  in insb()
106 		--count;  in insb()
114  * Read COUNT 16-bit words from port PORT into memory starting at
115  * SRC.  SRC must be at least short aligned.  This is used by the
132 	 case 0x00:			/* Buffer 32-bit aligned */  in insw()
133 		while (count>=2) {  in insw()
135 			count -= 2;  in insw()
146 	 case 0x02:			/* Buffer 16-bit aligned */  in insw()
148 		p += 2;  in insw()
149 		count--;  in insw()
150 		while (count>=2) {  in insw()
152 			count -= 2;  in insw()
163 	 case 0x01:			/* Buffer 8-bit aligned */  in insw()
166 		 * in this case, 16bit will have to do -- DE */  in insw()
167 		--count;  in insw()
172 		while (count--)  in insw()
176 			p += 2;  in insw()
187  * Read COUNT 32-bit words from port PORT into memory starting at
188  * SRC. Now works with any alignment in SRC. Performance is important,
204 	 case 0x00:			/* Buffer 32-bit aligned */  in insl()
205 		while (count--)  in insl()
212 	 case 0x02:			/* Buffer 16-bit aligned */  in insl()
213 		--count;  in insl()
217 		p += 2;  in insl()
219 		while (count--)  in insl()
228 	 case 0x01:			/* Buffer 8-bit aligned */  in insl()
229 		--count;  in insl()
235 		p += 2;  in insl()
236 		while (count--)  in insl()
245 	 case 0x03:			/* Buffer 8-bit aligned */  in insl()
246 		--count;  in insl()
251 		while (count--)  in insl()
259 		p += 2;  in insl()
270  * doing byte writes the slow way (no r-m-w cycle).
272 void outsb(unsigned long port, const void * src, unsigned long count)  in outsb()  argument
276 	p = (const unsigned char *)src;  in outsb()
278 		count--;  in outsb()
290 void outsw (unsigned long port, const void *src, unsigned long count)  in outsw()  argument
295 	p = (const unsigned char *)src;  in outsw()
302 	 case 0x00:			/* Buffer 32-bit aligned */  in outsw()
303 		while (count>=2) {  in outsw()
304 			count -= 2;  in outsw()
315 	 case 0x02:			/* Buffer 16-bit aligned */  in outsw()
318 		p += 2;  in outsw()
319 		count--;  in outsw()
321 		while (count>=2) {  in outsw()
322 			count -= 2;  in outsw()
333 	 case 0x01:			/* Buffer 8-bit aligned */	  in outsw()
335 		 * in this case, 16bit will have to do -- DE */  in outsw()
339 		count--;  in outsw()
342 			count--;  in outsw()
344 			p += 2;  in outsw()
358  * driver to write disk sectors.  Works with any alignment in SRC.
362 void outsl (unsigned long port, const void *src, unsigned long count)  in outsl()  argument
367 	p = (const unsigned char *)src;  in outsl()
374 	 case 0x00:			/* Buffer 32-bit aligned */  in outsl()
375 		while (count--)  in outsl()
382 	 case 0x02:			/* Buffer 16-bit aligned */  in outsl()
383 		--count;  in outsl()
386 		p += 2;  in outsl()
388 		while (count--)  in outsl()
398 	 case 0x01:			/* Buffer 8-bit aligned */  in outsl()
399 		--count;  in outsl()
404 		p += 2;  in outsl()
406 		while (count--)  in outsl()
416 	 case 0x03:			/* Buffer 8-bit aligned */  in outsl()
417 		--count;  in outsl()
422 		while (count--)  in outsl()
430 		p += 2;  in outsl()