1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (c) Matthew Wilcox 2001 for Hewlett-Packard
16  * Assumes the device can cope with 32-bit transfers.  If it can't,
26 		count--;  in memcpy_toio()
32 		count -= 4;  in memcpy_toio()
35 	while (count--) {  in memcpy_toio()
43 ** Assumes the device can cope with 32-bit transfers.  If it can't,
57 	if ( (((unsigned long)dst ^ (unsigned long)src) & 1) || (count < 2) )  in memcpy_fromio()
60 	if ( (((unsigned long)dst ^ (unsigned long)src) & 2) || (count < 4) )  in memcpy_fromio()
68 		count--;  in memcpy_fromio()
69 		if (count < 2) goto bytecopy;  in memcpy_fromio()
72 	if ((unsigned long)src & 2) {  in memcpy_fromio()
74 		src += 2;  in memcpy_fromio()
75 		dst += 2;  in memcpy_fromio()
76 		count -= 2;  in memcpy_fromio()
83 		count -= 4;  in memcpy_fromio()
89 		src += 2;  in memcpy_fromio()
90 		dst += 2;  in memcpy_fromio()
91 		count -= 2;  in memcpy_fromio()
95 	while (count--) {  in memcpy_fromio()
103  * Assumes the device can cope with 32-bit transfers.  If it can't,
111 		count--;  in memset_io()
116 		count -= 4;  in memset_io()
118 	while (count--) {  in memset_io()
124  * Read COUNT 8-bit bytes from port PORT into memory starting at
127 void insb (unsigned long port, void *dst, unsigned long count)  in insb()  argument
136 		count--;  in insb()
137 		*p = inb(port);  in insb()
143 		count -= 4;  in insb()
144 		w = inb(port) << 24;  in insb()
145 		w |= inb(port) << 16;  in insb()
146 		w |= inb(port) << 8;  in insb()
147 		w |= inb(port);  in insb()
153 		--count;  in insb()
154 		*p = inb(port);  in insb()
161  * Read COUNT 16-bit words from port PORT into memory starting at
167 void insw (unsigned long port, void *dst, unsigned long count)  in insw()  argument
179 	 case 0x00:			/* Buffer 32-bit aligned */  in insw()
180 		while (count>=2) {  in insw()
182 			count -= 2;  in insw()
183 			l = cpu_to_le16(inw(port)) << 16;  in insw()
184 			l |= cpu_to_le16(inw(port));  in insw()
189 			*(unsigned short *)p = cpu_to_le16(inw(port));  in insw()
193 	 case 0x02:			/* Buffer 16-bit aligned */  in insw()
194 		*(unsigned short *)p = cpu_to_le16(inw(port));  in insw()
195 		p += 2;  in insw()
196 		count--;  in insw()
197 		while (count>=2) {  in insw()
199 			count -= 2;  in insw()
200 			l = cpu_to_le16(inw(port)) << 16;  in insw()
201 			l |= cpu_to_le16(inw(port));  in insw()
206 			*(unsigned short *)p = cpu_to_le16(inw(port));  in insw()
210 	 case 0x01:			/* Buffer 8-bit aligned */  in insw()
213 		 * in this case, 16bit will have to do -- DE */  in insw()
214 		--count;  in insw()
216 		l = cpu_to_le16(inw(port));  in insw()
219 		while (count--)  in insw()
221 			l2 = cpu_to_le16(inw(port));  in insw()
223 			p += 2;  in insw()
234  * Read COUNT 32-bit words from port PORT into memory starting at
239 void insl (unsigned long port, void *dst, unsigned long count)  in insl()  argument
251 	 case 0x00:			/* Buffer 32-bit aligned */  in insl()
252 		while (count--)  in insl()
254 			*(unsigned int *)p = cpu_to_le32(inl(port));  in insl()
259 	 case 0x02:			/* Buffer 16-bit aligned */  in insl()
260 		--count;  in insl()
262 		l = cpu_to_le32(inl(port));  in insl()
264 		p += 2;  in insl()
266 		while (count--)  in insl()
268 			l2 = cpu_to_le32(inl(port));  in insl()
275 	 case 0x01:			/* Buffer 8-bit aligned */  in insl()
276 		--count;  in insl()
278 		l = cpu_to_le32(inl(port));  in insl()
282 		p += 2;  in insl()
283 		while (count--)  in insl()
285 			l2 = cpu_to_le32(inl(port));  in insl()
292 	 case 0x03:			/* Buffer 8-bit aligned */  in insl()
293 		--count;  in insl()
295 		l = cpu_to_le32(inl(port));  in insl()
298 		while (count--)  in insl()
300 			l2 = cpu_to_le32(inl(port));  in insl()
306 		p += 2;  in insl()
317  * doing byte writes the slow way (no r-m-w cycle).
319 void outsb(unsigned long port, const void * src, unsigned long count)  in outsb()  argument
325 		count--;  in outsb()
326 		outb(*p, port);  in outsb()
337 void outsw (unsigned long port, const void *src, unsigned long count)  in outsw()  argument
349 	 case 0x00:			/* Buffer 32-bit aligned */  in outsw()
350 		while (count>=2) {  in outsw()
351 			count -= 2;  in outsw()
354 			outw(le16_to_cpu(l >> 16), port);  in outsw()
355 			outw(le16_to_cpu(l & 0xffff), port);  in outsw()
358 			outw(le16_to_cpu(*(unsigned short*)p), port);  in outsw()
362 	 case 0x02:			/* Buffer 16-bit aligned */  in outsw()
364 		outw(le16_to_cpu(*(unsigned short*)p), port);  in outsw()
365 		p += 2;  in outsw()
366 		count--;  in outsw()
368 		while (count>=2) {  in outsw()
369 			count -= 2;  in outsw()
372 			outw(le16_to_cpu(l >> 16), port);  in outsw()
373 			outw(le16_to_cpu(l & 0xffff), port);  in outsw()
376 			outw(le16_to_cpu(*(unsigned short *)p), port);  in outsw()
380 	 case 0x01:			/* Buffer 8-bit aligned */	  in outsw()
382 		 * in this case, 16bit will have to do -- DE */  in outsw()
386 		count--;  in outsw()
389 			count--;  in outsw()
391 			p += 2;  in outsw()
392 			outw(le16_to_cpu(l | l2 >> 8), port);  in outsw()
396 		outw (le16_to_cpu(l | l2>>8), port);  in outsw()
409 void outsl (unsigned long port, const void *src, unsigned long count)  in outsl()  argument
421 	 case 0x00:			/* Buffer 32-bit aligned */  in outsl()
422 		while (count--)  in outsl()
424 			outl(le32_to_cpu(*(unsigned int *)p), port);  in outsl()
429 	 case 0x02:			/* Buffer 16-bit aligned */  in outsl()
430 		--count;  in outsl()
433 		p += 2;  in outsl()
435 		while (count--)  in outsl()
439 			outl (le32_to_cpu(l << 16 | l2 >> 16), port);  in outsl()
443 		outl (le32_to_cpu(l << 16 | l2), port);  in outsl()
445 	 case 0x01:			/* Buffer 8-bit aligned */  in outsl()
446 		--count;  in outsl()
451 		p += 2;  in outsl()
453 		while (count--)  in outsl()
457 			outl (le32_to_cpu(l | l2 >> 24), port);  in outsl()
461 		outl (le32_to_cpu(l | l2), port);  in outsl()
463 	 case 0x03:			/* Buffer 8-bit aligned */  in outsl()
464 		--count;  in outsl()
469 		while (count--)  in outsl()
473 			outl (le32_to_cpu(l | l2 >> 8), port);  in outsl()
477 		p += 2;  in outsl()
479 		outl (le32_to_cpu(l | l2), port);  in outsl()