File: /usr/src/linux/include/asm-arm/arch-shark/io.h
1 /*
2 * linux/include/asm-arm/arch-shark/io.h
3 *
4 * by Alexander Schulz <aschulz@netwinder.org>
5 *
6 * derived from:
7 * linux/include/asm-arm/arch-ebsa110/io.h
8 * Copyright (C) 1997,1998 Russell King
9 */
10
11 #ifndef __ASM_ARM_ARCH_IO_H
12 #define __ASM_ARM_ARCH_IO_H
13
14 #define iomem_valid_addr(off,sz) (1)
15 #define iomem_to_phys(off) (off)
16
17 #define IO_SPACE_LIMIT 0xffffffff
18
19 /*
20 * We use two different types of addressing - PC style addresses, and ARM
21 * addresses. PC style accesses the PC hardware with the normal PC IO
22 * addresses, eg 0x3f8 for serial#1. ARM addresses are 0x80000000+
23 * and are translated to the start of IO.
24 */
25 #define __PORT_PCIO(x) (!((x) & 0x80000000))
26
27 /*
28 * Dynamic IO functions - let the compiler
29 * optimize the expressions
30 */
31 #define DECLARE_DYN_OUT(fnsuffix,instr) \
32 static inline void __out##fnsuffix (unsigned int value, unsigned int port) \
33 { \
34 unsigned long temp; \
35 __asm__ __volatile__( \
36 "tst %2, #0x80000000\n\t" \
37 "mov %0, %4\n\t" \
38 "addeq %0, %0, %3\n\t" \
39 "str" instr " %1, [%0, %2] @ out" #fnsuffix \
40 : "=&r" (temp) \
41 : "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE) \
42 : "cc"); \
43 }
44
45 #define DECLARE_DYN_IN(sz,fnsuffix,instr) \
46 static inline unsigned sz __in##fnsuffix (unsigned int port) \
47 { \
48 unsigned long temp, value; \
49 __asm__ __volatile__( \
50 "tst %2, #0x80000000\n\t" \
51 "mov %0, %4\n\t" \
52 "addeq %0, %0, %3\n\t" \
53 "ldr" instr " %1, [%0, %2] @ in" #fnsuffix \
54 : "=&r" (temp), "=r" (value) \
55 : "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE) \
56 : "cc"); \
57 return (unsigned sz)value; \
58 }
59
60 static inline unsigned int __ioaddr (unsigned int port)
61 {
62 if (__PORT_PCIO(port))
63 return (unsigned int)(PCIO_BASE + (port));
64 else
65 return (unsigned int)(IO_BASE + (port));
66 }
67
68 #define DECLARE_IO(sz,fnsuffix,instr) \
69 DECLARE_DYN_OUT(fnsuffix,instr) \
70 DECLARE_DYN_IN(sz,fnsuffix,instr)
71
72 DECLARE_IO(char,b,"b")
73 DECLARE_IO(short,w,"h")
74 DECLARE_IO(long,l,"")
75
76 #undef DECLARE_IO
77 #undef DECLARE_DYN_OUT
78 #undef DECLARE_DYN_IN
79
80 /*
81 * Constant address IO functions
82 *
83 * These have to be macros for the 'J' constraint to work -
84 * +/-4096 immediate operand.
85 */
86 #define __outbc(value,port) \
87 ({ \
88 if (__PORT_PCIO((port))) \
89 __asm__ __volatile__( \
90 "strb %0, [%1, %2] @ outbc" \
91 : : "r" (value), "r" (PCIO_BASE), "Jr" (port)); \
92 else \
93 __asm__ __volatile__( \
94 "strb %0, [%1, %2] @ outbc" \
95 : : "r" (value), "r" (IO_BASE), "r" (port)); \
96 })
97
98 #define __inbc(port) \
99 ({ \
100 unsigned char result; \
101 if (__PORT_PCIO((port))) \
102 __asm__ __volatile__( \
103 "ldrb %0, [%1, %2] @ inbc" \
104 : "=r" (result) : "r" (PCIO_BASE), "Jr" (port)); \
105 else \
106 __asm__ __volatile__( \
107 "ldrb %0, [%1, %2] @ inbc" \
108 : "=r" (result) : "r" (IO_BASE), "r" (port)); \
109 result; \
110 })
111
112 #define __outwc(value,port) \
113 ({ \
114 unsigned long v = value; \
115 if (__PORT_PCIO((port))) \
116 __asm__ __volatile__( \
117 "strh %0, [%1, %2] @ outwc" \
118 : : "r" (v|v<<16), "r" (PCIO_BASE), "Jr" (port)); \
119 else \
120 __asm__ __volatile__( \
121 "strh %0, [%1, %2] @ outwc" \
122 : : "r" (v|v<<16), "r" (IO_BASE), "r" (port)); \
123 })
124
125 #define __inwc(port) \
126 ({ \
127 unsigned short result; \
128 if (__PORT_PCIO((port))) \
129 __asm__ __volatile__( \
130 "ldrh %0, [%1, %2] @ inwc" \
131 : "=r" (result) : "r" (PCIO_BASE), "Jr" (port)); \
132 else \
133 __asm__ __volatile__( \
134 "ldrh %0, [%1, %2] @ inwc" \
135 : "=r" (result) : "r" (IO_BASE), "r" (port)); \
136 result & 0xffff; \
137 })
138
139 #define __outlc(value,port) \
140 ({ \
141 unsigned long v = value; \
142 if (__PORT_PCIO((port))) \
143 __asm__ __volatile__( \
144 "str %0, [%1, %2] @ outlc" \
145 : : "r" (v), "r" (PCIO_BASE), "Jr" (port)); \
146 else \
147 __asm__ __volatile__( \
148 "str %0, [%1, %2] @ outlc" \
149 : : "r" (v), "r" (IO_BASE), "r" (port)); \
150 })
151
152 #define __inlc(port) \
153 ({ \
154 unsigned long result; \
155 if (__PORT_PCIO((port))) \
156 __asm__ __volatile__( \
157 "ldr %0, [%1, %2] @ inlc" \
158 : "=r" (result) : "r" (PCIO_BASE), "Jr" (port)); \
159 else \
160 __asm__ __volatile__( \
161 "ldr %0, [%1, %2] @ inlc" \
162 : "=r" (result) : "r" (IO_BASE), "r" (port)); \
163 result; \
164 })
165
166 #define __ioaddrc(port) \
167 ({ \
168 unsigned long addr; \
169 if (__PORT_PCIO((port))) \
170 addr = PCIO_BASE + (port); \
171 else \
172 addr = IO_BASE + (port); \
173 addr; \
174 })
175
176 #define __mem_pci(addr) addr
177
178 #define inb(p) (__builtin_constant_p((p)) ? __inbc(p) : __inb(p))
179 #define inw(p) (__builtin_constant_p((p)) ? __inwc(p) : __inw(p))
180 #define inl(p) (__builtin_constant_p((p)) ? __inlc(p) : __inl(p))
181 #define outb(v,p) (__builtin_constant_p((p)) ? __outbc(v,p) : __outb(v,p))
182 #define outw(v,p) (__builtin_constant_p((p)) ? __outwc(v,p) : __outw(v,p))
183 #define outl(v,p) (__builtin_constant_p((p)) ? __outlc(v,p) : __outl(v,p))
184
185 #define __arch_getw(addr) (*(volatile unsigned short *)(addr))
186 #define __arch_putw(b,addr) (*(volatile unsigned short *)(addr) = (b))
187
188 /*
189 * Translated address IO functions
190 *
191 * IO address has already been translated to a virtual address
192 */
193 #define outb_t(v,p) \
194 (*(volatile unsigned char *)(p) = (v))
195
196 #define inb_t(p) \
197 (*(volatile unsigned char *)(p))
198
199 #define outl_t(v,p) \
200 (*(volatile unsigned long *)(p) = (v))
201
202 #define inl_t(p) \
203 (*(volatile unsigned long *)(p))
204
205 #endif
206