1 /*
2  *  linux/include/asm-arm/arch-arc/io.h
3  *
4  *  Copyright (C) 1997 Russell King
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  *
10  *  Modifications:
11  *   06-Dec-1997 RMK	Created.
12  */
13 #ifndef __ASM_ARM_ARCH_IO_H
14 #define __ASM_ARM_ARCH_IO_H
15 
16 #define IO_SPACE_LIMIT 0xffffffff
17 
18 /*
19  * GCC is totally crap at loading/storing data.  We try to persuade it
20  * to do the right thing by using these whereever possible instead of
21  * the above.
22  */
23 #define __arch_base_getb(b,o)			\
24  ({						\
25 	unsigned int v, r = (b);		\
26 	__asm__ __volatile__(			\
27 		"ldrb	%0, [%1, %2]"		\
28 		: "=r" (v)			\
29 		: "r" (r), "Ir" (o));		\
30 	v;					\
31  })
32 
33 #define __arch_base_getl(b,o)			\
34  ({						\
35 	unsigned int v, r = (b);		\
36 	__asm__ __volatile__(			\
37 		"ldr	%0, [%1, %2]"		\
38 		: "=r" (v)			\
39 		: "r" (r), "Ir" (o));		\
40 	v;					\
41  })
42 
43 #define __arch_base_putb(v,b,o)			\
44  ({						\
45 	unsigned int r = (b);			\
46 	__asm__ __volatile__(			\
47 		"strb	%0, [%1, %2]"		\
48 		:				\
49 		: "r" (v), "r" (r), "Ir" (o));	\
50  })
51 
52 #define __arch_base_putl(v,b,o)			\
53  ({						\
54 	unsigned int r = (b);			\
55 	__asm__ __volatile__(			\
56 		"str	%0, [%1, %2]"		\
57 		:				\
58 		: "r" (v), "r" (r), "Ir" (o));	\
59  })
60 
61 /*
62  * We use two different types of addressing - PC style addresses, and ARM
63  * addresses.  PC style accesses the PC hardware with the normal PC IO
64  * addresses, eg 0x3f8 for serial#1.  ARM addresses are 0x80000000+
65  * and are translated to the start of IO.  Note that all addresses are
66  * shifted left!
67  */
68 #define __PORT_PCIO(x)	(!((x) & 0x80000000))
69 
70 /*
71  * Dynamic IO functions - let the compiler
72  * optimize the expressions
73  */
__outb(unsigned int value,unsigned int port)74 static inline void __outb (unsigned int value, unsigned int port)
75 {
76 	unsigned long temp;
77 	__asm__ __volatile__(
78 	"tst	%2, #0x80000000\n\t"
79 	"mov	%0, %4\n\t"
80 	"addeq	%0, %0, %3\n\t"
81 	"strb	%1, [%0, %2, lsl #2]	@ outb"
82 	: "=&r" (temp)
83 	: "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
84 	: "cc");
85 }
86 
__outw(unsigned int value,unsigned int port)87 static inline void __outw (unsigned int value, unsigned int port)
88 {
89 	unsigned long temp;
90 	__asm__ __volatile__(
91 	"tst	%2, #0x80000000\n\t"
92 	"mov	%0, %4\n\t"
93 	"addeq	%0, %0, %3\n\t"
94 	"str	%1, [%0, %2, lsl #2]	@ outw"
95 	: "=&r" (temp)
96 	: "r" (value|value<<16), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
97 	: "cc");
98 }
99 
__outl(unsigned int value,unsigned int port)100 static inline void __outl (unsigned int value, unsigned int port)
101 {
102 	unsigned long temp;
103 	__asm__ __volatile__(
104 	"tst	%2, #0x80000000\n\t"
105 	"mov	%0, %4\n\t"
106 	"addeq	%0, %0, %3\n\t"
107 	"str	%1, [%0, %2, lsl #2]	@ outl"
108 	: "=&r" (temp)
109 	: "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
110 	: "cc");
111 }
112 
113 #define DECLARE_DYN_IN(sz,fnsuffix,instr)					\
114 static inline unsigned sz __in##fnsuffix (unsigned int port)		\
115 {										\
116 	unsigned long temp, value;						\
117 	__asm__ __volatile__(							\
118 	"tst	%2, #0x80000000\n\t"						\
119 	"mov	%0, %4\n\t"							\
120 	"addeq	%0, %0, %3\n\t"							\
121 	"ldr" instr "	%1, [%0, %2, lsl #2]	@ in" #fnsuffix			\
122 	: "=&r" (temp), "=r" (value)						\
123 	: "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)		\
124 	: "cc");								\
125 	return (unsigned sz)value;						\
126 }
127 
__ioaddr(unsigned int port)128 static inline unsigned int __ioaddr (unsigned int port)			\
129 {										\
130 	if (__PORT_PCIO(port))							\
131 		return (unsigned int)(PCIO_BASE + (port << 2));			\
132 	else									\
133 		return (unsigned int)(IO_BASE + (port << 2));			\
134 }
135 
136 #define DECLARE_IO(sz,fnsuffix,instr)	\
137 	DECLARE_DYN_IN(sz,fnsuffix,instr)
138 
139 DECLARE_IO(char,b,"b")
140 DECLARE_IO(short,w,"")
141 DECLARE_IO(int,l,"")
142 
143 #undef DECLARE_IO
144 #undef DECLARE_DYN_IN
145 
146 /*
147  * Constant address IO functions
148  *
149  * These have to be macros for the 'J' constraint to work -
150  * +/-4096 immediate operand.
151  */
152 #define __outbc(value,port)							\
153 ({										\
154 	if (__PORT_PCIO((port)))						\
155 		__asm__ __volatile__(						\
156 		"strb	%0, [%1, %2]	@ outbc"				\
157 		: : "r" (value), "r" (PCIO_BASE), "Jr" ((port) << 2));		\
158 	else									\
159 		__asm__ __volatile__(						\
160 		"strb	%0, [%1, %2]	@ outbc"				\
161 		: : "r" (value), "r" (IO_BASE), "r" ((port) << 2));		\
162 })
163 
164 #define __inbc(port)								\
165 ({										\
166 	unsigned char result;							\
167 	if (__PORT_PCIO((port)))						\
168 		__asm__ __volatile__(						\
169 		"ldrb	%0, [%1, %2]	@ inbc"					\
170 		: "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));		\
171 	else									\
172 		__asm__ __volatile__(						\
173 		"ldrb	%0, [%1, %2]	@ inbc"					\
174 		: "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));		\
175 	result;									\
176 })
177 
178 #define __outwc(value,port)							\
179 ({										\
180 	unsigned long v = value;						\
181 	if (__PORT_PCIO((port)))						\
182 		__asm__ __volatile__(						\
183 		"str	%0, [%1, %2]	@ outwc"				\
184 		: : "r" (v|v<<16), "r" (PCIO_BASE), "Jr" ((port) << 2));	\
185 	else									\
186 		__asm__ __volatile__(						\
187 		"str	%0, [%1, %2]	@ outwc"				\
188 		: : "r" (v|v<<16), "r" (IO_BASE), "r" ((port) << 2));		\
189 })
190 
191 #define __inwc(port)								\
192 ({										\
193 	unsigned short result;							\
194 	if (__PORT_PCIO((port)))						\
195 		__asm__ __volatile__(						\
196 		"ldr	%0, [%1, %2]	@ inwc"					\
197 		: "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));		\
198 	else									\
199 		__asm__ __volatile__(						\
200 		"ldr	%0, [%1, %2]	@ inwc"					\
201 		: "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));		\
202 	result & 0xffff;							\
203 })
204 
205 #define __outlc(value,port) 							\
206 ({										\
207 	unsigned long v = value;						\
208 	if (__PORT_PCIO((port)))						\
209 		__asm__ __volatile__(						\
210 		"str	%0, [%1, %2]	@ outlc"				\
211 		: : "r" (v), "r" (PCIO_BASE), "Jr" ((port) << 2));		\
212 	else									\
213 		__asm__ __volatile__(						\
214 		"str	%0, [%1, %2]	@ outlc"				\
215 		: : "r" (v), "r" (IO_BASE), "r" ((port) << 2));			\
216 })
217 
218 #define __inlc(port)								\
219 ({										\
220 	unsigned long result;							\
221 	if (__PORT_PCIO((port)))						\
222 		__asm__ __volatile__(						\
223 		"ldr	%0, [%1, %2]	@ inlc"					\
224 		: "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));		\
225 	else									\
226 		__asm__ __volatile__(						\
227 		"ldr	%0, [%1, %2]	@ inlc"					\
228 		: "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));		\
229 	result;									\
230 })
231 
232 #define __ioaddrc(port)								\
233 ({										\
234 	unsigned long addr;							\
235 	if (__PORT_PCIO((port)))						\
236 		addr = PCIO_BASE + ((port) << 2);				\
237 	else									\
238 		addr = IO_BASE + ((port) << 2);					\
239 	addr;									\
240 })
241 
242 #define inb(p)	 	(__builtin_constant_p((p)) ? __inbc(p)    : __inb(p))
243 #define inw(p)	 	(__builtin_constant_p((p)) ? __inwc(p)    : __inw(p))
244 #define inl(p)	 	(__builtin_constant_p((p)) ? __inlc(p)    : __inl(p))
245 #define outb(v,p)	(__builtin_constant_p((p)) ? __outbc(v,p) : __outb(v,p))
246 #define outw(v,p)	(__builtin_constant_p((p)) ? __outwc(v,p) : __outw(v,p))
247 #define outl(v,p)	(__builtin_constant_p((p)) ? __outlc(v,p) : __outl(v,p))
248 #define __ioaddr(p)	(__builtin_constant_p((p)) ? __ioaddr(p)  : __ioaddrc(p))
249 /* the following macro is depreciated */
250 #define ioaddr(port)			__ioaddr((port))
251 
252 #endif
253