1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * PeeCeeI.c: The emerging standard...
4 *
5 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
6 */
7
8 #include <linux/module.h>
9
10 #include <asm/io.h>
11 #include <asm/byteorder.h>
12
outsb(unsigned long __addr,const void * src,unsigned long count)13 void outsb(unsigned long __addr, const void *src, unsigned long count)
14 {
15 void __iomem *addr = (void __iomem *) __addr;
16 const u8 *p = src;
17
18 while (count--)
19 __raw_writeb(*p++, addr);
20 }
21 EXPORT_SYMBOL(outsb);
22
outsw(unsigned long __addr,const void * src,unsigned long count)23 void outsw(unsigned long __addr, const void *src, unsigned long count)
24 {
25 void __iomem *addr = (void __iomem *) __addr;
26
27 while (count--) {
28 __raw_writew(*(u16 *)src, addr);
29 src += sizeof(u16);
30 }
31 }
32 EXPORT_SYMBOL(outsw);
33
outsl(unsigned long __addr,const void * src,unsigned long count)34 void outsl(unsigned long __addr, const void *src, unsigned long count)
35 {
36 void __iomem *addr = (void __iomem *) __addr;
37 u32 l, l2;
38
39 if (!count)
40 return;
41
42 switch (((unsigned long)src) & 0x3) {
43 case 0x0:
44 /* src is naturally aligned */
45 while (count--) {
46 __raw_writel(*(u32 *)src, addr);
47 src += sizeof(u32);
48 }
49 break;
50 case 0x2:
51 /* 2-byte alignment */
52 while (count--) {
53 l = (*(u16 *)src) << 16;
54 l |= *(u16 *)(src + sizeof(u16));
55 __raw_writel(l, addr);
56 src += sizeof(u32);
57 }
58 break;
59 case 0x1:
60 /* Hold three bytes in l each time, grab a byte from l2 */
61 l = (*(u8 *)src) << 24;
62 l |= (*(u16 *)(src + sizeof(u8))) << 8;
63 src += sizeof(u8) + sizeof(u16);
64 while (count--) {
65 l2 = *(u32 *)src;
66 l |= (l2 >> 24);
67 __raw_writel(l, addr);
68 l = l2 << 8;
69 src += sizeof(u32);
70 }
71 break;
72 case 0x3:
73 /* Hold a byte in l each time, grab 3 bytes from l2 */
74 l = (*(u8 *)src) << 24;
75 src += sizeof(u8);
76 while (count--) {
77 l2 = *(u32 *)src;
78 l |= (l2 >> 8);
79 __raw_writel(l, addr);
80 l = l2 << 24;
81 src += sizeof(u32);
82 }
83 break;
84 }
85 }
86 EXPORT_SYMBOL(outsl);
87
insb(unsigned long __addr,void * dst,unsigned long count)88 void insb(unsigned long __addr, void *dst, unsigned long count)
89 {
90 void __iomem *addr = (void __iomem *) __addr;
91
92 if (count) {
93 u32 *pi;
94 u8 *pb = dst;
95
96 while ((((unsigned long)pb) & 0x3) && count--)
97 *pb++ = __raw_readb(addr);
98 pi = (u32 *)pb;
99 while (count >= 4) {
100 u32 w;
101
102 w = (__raw_readb(addr) << 24);
103 w |= (__raw_readb(addr) << 16);
104 w |= (__raw_readb(addr) << 8);
105 w |= (__raw_readb(addr) << 0);
106 *pi++ = w;
107 count -= 4;
108 }
109 pb = (u8 *)pi;
110 while (count--)
111 *pb++ = __raw_readb(addr);
112 }
113 }
114 EXPORT_SYMBOL(insb);
115
insw(unsigned long __addr,void * dst,unsigned long count)116 void insw(unsigned long __addr, void *dst, unsigned long count)
117 {
118 void __iomem *addr = (void __iomem *) __addr;
119
120 if (count) {
121 u16 *ps = dst;
122 u32 *pi;
123
124 if (((unsigned long)ps) & 0x2) {
125 *ps++ = __raw_readw(addr);
126 count--;
127 }
128 pi = (u32 *)ps;
129 while (count >= 2) {
130 u32 w;
131
132 w = __raw_readw(addr) << 16;
133 w |= __raw_readw(addr) << 0;
134 *pi++ = w;
135 count -= 2;
136 }
137 ps = (u16 *)pi;
138 if (count)
139 *ps = __raw_readw(addr);
140 }
141 }
142 EXPORT_SYMBOL(insw);
143
insl(unsigned long __addr,void * dst,unsigned long count)144 void insl(unsigned long __addr, void *dst, unsigned long count)
145 {
146 void __iomem *addr = (void __iomem *) __addr;
147
148 if (count) {
149 if ((((unsigned long)dst) & 0x3) == 0) {
150 u32 *pi = dst;
151 while (count--)
152 *pi++ = __raw_readl(addr);
153 } else {
154 u32 l = 0, l2, *pi;
155 u16 *ps;
156 u8 *pb;
157
158 switch (((unsigned long)dst) & 3) {
159 case 0x2:
160 ps = dst;
161 count -= 1;
162 l = __raw_readl(addr);
163 *ps++ = l;
164 pi = (u32 *)ps;
165 while (count--) {
166 l2 = __raw_readl(addr);
167 *pi++ = (l << 16) | (l2 >> 16);
168 l = l2;
169 }
170 ps = (u16 *)pi;
171 *ps = l;
172 break;
173
174 case 0x1:
175 pb = dst;
176 count -= 1;
177 l = __raw_readl(addr);
178 *pb++ = l >> 24;
179 ps = (u16 *)pb;
180 *ps++ = ((l >> 8) & 0xffff);
181 pi = (u32 *)ps;
182 while (count--) {
183 l2 = __raw_readl(addr);
184 *pi++ = (l << 24) | (l2 >> 8);
185 l = l2;
186 }
187 pb = (u8 *)pi;
188 *pb = l;
189 break;
190
191 case 0x3:
192 pb = (u8 *)dst;
193 count -= 1;
194 l = __raw_readl(addr);
195 *pb++ = l >> 24;
196 pi = (u32 *)pb;
197 while (count--) {
198 l2 = __raw_readl(addr);
199 *pi++ = (l << 8) | (l2 >> 24);
200 l = l2;
201 }
202 ps = (u16 *)pi;
203 *ps++ = ((l >> 8) & 0xffff);
204 pb = (u8 *)ps;
205 *pb = l;
206 break;
207 }
208 }
209 }
210 }
211 EXPORT_SYMBOL(insl);
212
213