2 * linux/include/asm-arm/io.h
4 * Copyright (C) 1996-2000 Russell King
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.
11 * 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both
12 * constant addresses and variable addresses.
13 * 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture
14 * specific IO header files.
15 * 27-Mar-1999 PJB Second parameter of memcpy_toio is const..
16 * 04-Apr-1999 PJB Added check_signature.
17 * 12-Dec-1999 RMK More cleanups
18 * 18-Jun-2000 RMK Removed virt_to_* and friends definitions
20 #ifndef __ASM_ARM_IO_H
21 #define __ASM_ARM_IO_H
25 #include <linux/types.h>
26 #include <linux/kernel.h>
27 #include <asm/byteorder.h>
28 #include <asm/memory.h>
29 #include <asm/barriers.h>
31 #include <asm/arch/hardware.h>
32 #endif /* XXX###XXX */
34 static inline void sync(void)
39 * Generic virtual read/write. Note that we don't support half-word
40 * read/writes. We define __arch_*[bl] here, and leave __arch_*w
41 * to the architecture specific code.
43 #define __arch_getb(a) (*(volatile unsigned char *)(a))
44 #define __arch_getw(a) (*(volatile unsigned short *)(a))
45 #define __arch_getl(a) (*(volatile unsigned int *)(a))
46 #define __arch_getq(a) (*(volatile unsigned long long *)(a))
48 #define __arch_putb(v,a) (*(volatile unsigned char *)(a) = (v))
49 #define __arch_putw(v,a) (*(volatile unsigned short *)(a) = (v))
50 #define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v))
51 #define __arch_putq(v,a) (*(volatile unsigned long long *)(a) = (v))
53 static inline void __raw_writesb(unsigned long addr, const void *data,
56 uint8_t *buf = (uint8_t *)data;
58 __arch_putb(*buf++, addr);
61 static inline void __raw_writesw(unsigned long addr, const void *data,
64 uint16_t *buf = (uint16_t *)data;
66 __arch_putw(*buf++, addr);
69 static inline void __raw_writesl(unsigned long addr, const void *data,
72 uint32_t *buf = (uint32_t *)data;
74 __arch_putl(*buf++, addr);
77 static inline void __raw_readsb(unsigned long addr, void *data, int bytelen)
79 uint8_t *buf = (uint8_t *)data;
81 *buf++ = __arch_getb(addr);
84 static inline void __raw_readsw(unsigned long addr, void *data, int wordlen)
86 uint16_t *buf = (uint16_t *)data;
88 *buf++ = __arch_getw(addr);
91 static inline void __raw_readsl(unsigned long addr, void *data, int longlen)
93 uint32_t *buf = (uint32_t *)data;
95 *buf++ = __arch_getl(addr);
98 #define __raw_writeb(v,a) __arch_putb(v,a)
99 #define __raw_writew(v,a) __arch_putw(v,a)
100 #define __raw_writel(v,a) __arch_putl(v,a)
101 #define __raw_writeq(v,a) __arch_putq(v,a)
103 #define __raw_readb(a) __arch_getb(a)
104 #define __raw_readw(a) __arch_getw(a)
105 #define __raw_readl(a) __arch_getl(a)
106 #define __raw_readq(a) __arch_getq(a)
109 * TODO: The kernel offers some more advanced versions of barriers, it might
110 * have some advantages to use them instead of the simple one here.
115 #define __iormb() dmb()
116 #define __iowmb() dmb()
118 #define smp_processor_id() 0
120 #define writeb(v,c) ({ u8 __v = v; __iowmb(); __arch_putb(__v,c); __v; })
121 #define writew(v,c) ({ u16 __v = v; __iowmb(); __arch_putw(__v,c); __v; })
122 #define writel(v,c) ({ u32 __v = v; __iowmb(); __arch_putl(__v,c); __v; })
123 #define writeq(v,c) ({ u64 __v = v; __iowmb(); __arch_putq(__v,c); __v; })
125 #define readb(c) ({ u8 __v = __arch_getb(c); __iormb(); __v; })
126 #define readw(c) ({ u16 __v = __arch_getw(c); __iormb(); __v; })
127 #define readl(c) ({ u32 __v = __arch_getl(c); __iormb(); __v; })
128 #define readq(c) ({ u64 __v = __arch_getq(c); __iormb(); __v; })
131 * Relaxed I/O memory access primitives. These follow the Device memory
132 * ordering rules but do not guarantee any ordering relative to Normal memory
135 #define readb_relaxed(c) ({ u8 __r = __raw_readb(c); __r; })
136 #define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16) \
137 __raw_readw(c)); __r; })
138 #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
139 __raw_readl(c)); __r; })
140 #define readq_relaxed(c) ({ u64 __r = le64_to_cpu((__force __le64) \
141 __raw_readq(c)); __r; })
143 #define writeb_relaxed(v, c) ((void)__raw_writeb((v), (c)))
144 #define writew_relaxed(v, c) ((void)__raw_writew((__force u16) \
145 cpu_to_le16(v), (c)))
146 #define writel_relaxed(v, c) ((void)__raw_writel((__force u32) \
147 cpu_to_le32(v), (c)))
148 #define writeq_relaxed(v, c) ((void)__raw_writeq((__force u64) \
149 cpu_to_le64(v), (c)))
152 * The compiler seems to be incapable of optimising constants
153 * properly. Spell it out to the compiler in some cases.
154 * These are only valid for small values of "off" (< 1<<12)
156 #define __raw_base_writeb(val,base,off) __arch_base_putb(val,base,off)
157 #define __raw_base_writew(val,base,off) __arch_base_putw(val,base,off)
158 #define __raw_base_writel(val,base,off) __arch_base_putl(val,base,off)
160 #define __raw_base_readb(base,off) __arch_base_getb(base,off)
161 #define __raw_base_readw(base,off) __arch_base_getw(base,off)
162 #define __raw_base_readl(base,off) __arch_base_getl(base,off)
165 * Clear and set bits in one shot. These macros can be used to clear and
166 * set multiple bits in a register using a single call. These macros can
167 * also be used to set a multiple-bit bit pattern using a mask, by
168 * specifying the mask in the 'clear' parameter and the new bit pattern
169 * in the 'set' parameter.
172 #define out_arch(type,endian,a,v) __raw_write##type(cpu_to_##endian(v),a)
173 #define in_arch(type,endian,a) endian##_to_cpu(__raw_read##type(a))
175 #define out_le64(a,v) out_arch(q,le64,a,v)
176 #define out_le32(a,v) out_arch(l,le32,a,v)
177 #define out_le16(a,v) out_arch(w,le16,a,v)
179 #define in_le64(a) in_arch(q,le64,a)
180 #define in_le32(a) in_arch(l,le32,a)
181 #define in_le16(a) in_arch(w,le16,a)
183 #define out_be32(a,v) out_arch(l,be32,a,v)
184 #define out_be16(a,v) out_arch(w,be16,a,v)
186 #define in_be32(a) in_arch(l,be32,a)
187 #define in_be16(a) in_arch(w,be16,a)
189 #define out_32(a,v) __raw_writel(v,a)
190 #define out_16(a,v) __raw_writew(v,a)
191 #define out_8(a,v) __raw_writeb(v,a)
193 #define in_32(a) __raw_readl(a)
194 #define in_16(a) __raw_readw(a)
195 #define in_8(a) __raw_readb(a)
197 #define clrbits(type, addr, clear) \
198 out_##type((addr), in_##type(addr) & ~(clear))
200 #define setbits(type, addr, set) \
201 out_##type((addr), in_##type(addr) | (set))
203 #define clrsetbits(type, addr, clear, set) \
204 out_##type((addr), (in_##type(addr) & ~(clear)) | (set))
206 #define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
207 #define setbits_be32(addr, set) setbits(be32, addr, set)
208 #define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
210 #define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
211 #define setbits_le32(addr, set) setbits(le32, addr, set)
212 #define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
214 #define clrbits_32(addr, clear) clrbits(32, addr, clear)
215 #define setbits_32(addr, set) setbits(32, addr, set)
216 #define clrsetbits_32(addr, clear, set) clrsetbits(32, addr, clear, set)
218 #define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
219 #define setbits_be16(addr, set) setbits(be16, addr, set)
220 #define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
222 #define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
223 #define setbits_le16(addr, set) setbits(le16, addr, set)
224 #define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)
226 #define clrbits_16(addr, clear) clrbits(16, addr, clear)
227 #define setbits_16(addr, set) setbits(16, addr, set)
228 #define clrsetbits_16(addr, clear, set) clrsetbits(16, addr, clear, set)
230 #define clrbits_8(addr, clear) clrbits(8, addr, clear)
231 #define setbits_8(addr, set) setbits(8, addr, set)
232 #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
235 * Now, pick up the machine-defined IO definitions
237 #if 0 /* XXX###XXX */
238 #include <asm/arch/io.h>
239 #endif /* XXX###XXX */
242 * IO port access primitives
243 * -------------------------
245 * The ARM doesn't have special IO access instructions; all IO is memory
246 * mapped. Note that these are defined to perform little endian accesses
247 * only. Their primary purpose is to access PCI and ISA peripherals.
249 * Note that for a big endian machine, this implies that the following
250 * big endian mode connectivity is in place, as described by numerous
253 * PCI: D0-D7 D8-D15 D16-D23 D24-D31
254 * ARM: D24-D31 D16-D23 D8-D15 D0-D7
256 * The machine specific io.h include defines __io to translate an "IO"
257 * address to a memory address.
259 * Note that we prevent GCC re-ordering or caching values in expressions
260 * by introducing sequence points into the in*() definitions. Note that
261 * __raw_* do not guarantee this behaviour.
263 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
266 #define outb(v,p) __raw_writeb(v,__io(p))
267 #define outw(v,p) __raw_writew(cpu_to_le16(v),__io(p))
268 #define outl(v,p) __raw_writel(cpu_to_le32(v),__io(p))
270 #define inb(p) ({ unsigned int __v = __raw_readb(__io(p)); __v; })
271 #define inw(p) ({ unsigned int __v = le16_to_cpu(__raw_readw(__io(p))); __v; })
272 #define inl(p) ({ unsigned int __v = le32_to_cpu(__raw_readl(__io(p))); __v; })
274 #define outsb(p,d,l) __raw_writesb(__io(p),d,l)
275 #define outsw(p,d,l) __raw_writesw(__io(p),d,l)
276 #define outsl(p,d,l) __raw_writesl(__io(p),d,l)
278 #define insb(p,d,l) __raw_readsb(__io(p),d,l)
279 #define insw(p,d,l) __raw_readsw(__io(p),d,l)
280 #define insl(p,d,l) __raw_readsl(__io(p),d,l)
283 #define outb_p(val,port) outb((val),(port))
284 #define outw_p(val,port) outw((val),(port))
285 #define outl_p(val,port) outl((val),(port))
286 #define inb_p(port) inb((port))
287 #define inw_p(port) inw((port))
288 #define inl_p(port) inl((port))
290 #define outsb_p(port,from,len) outsb(port,from,len)
291 #define outsw_p(port,from,len) outsw(port,from,len)
292 #define outsl_p(port,from,len) outsl(port,from,len)
293 #define insb_p(port,to,len) insb(port,to,len)
294 #define insw_p(port,to,len) insw(port,to,len)
295 #define insl_p(port,to,len) insl(port,to,len)
297 #define writesl(a, d, s) __raw_writesl((unsigned long)a, d, s)
298 #define readsl(a, d, s) __raw_readsl((unsigned long)a, d, s)
299 #define writesw(a, d, s) __raw_writesw((unsigned long)a, d, s)
300 #define readsw(a, d, s) __raw_readsw((unsigned long)a, d, s)
301 #define writesb(a, d, s) __raw_writesb((unsigned long)a, d, s)
302 #define readsb(a, d, s) __raw_readsb((unsigned long)a, d, s)
305 * DMA-consistent mapping functions. These allocate/free a region of
306 * uncached, unwrite-buffered mapped memory space for use with DMA
307 * devices. This is the "generic" version. The PCI specific version
310 extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
311 extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
312 extern void consistent_sync(void *vaddr, size_t size, int rw);
315 * String version of IO memory access ops:
317 extern void _memcpy_fromio(void *, unsigned long, size_t);
318 extern void _memcpy_toio(unsigned long, const void *, size_t);
319 extern void _memset_io(unsigned long, int, size_t);
321 extern void __readwrite_bug(const char *fn);
323 /* Optimized copy functions to read from/write to IO sapce */
326 * Copy data from IO memory space to "real" memory space.
329 void __memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
331 while (count && !IS_ALIGNED((unsigned long)from, 8)) {
332 *(u8 *)to = __raw_readb(from);
339 *(u64 *)to = __raw_readq(from);
346 *(u8 *)to = __raw_readb(from);
354 * Copy data from "real" memory space to IO memory space.
357 void __memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
359 while (count && !IS_ALIGNED((unsigned long)to, 8)) {
360 __raw_writeb(*(u8 *)from, to);
367 __raw_writeq(*(u64 *)from, to);
374 __raw_writeb(*(u8 *)from, to);
382 * "memset" on IO memory space.
385 void __memset_io(volatile void __iomem *dst, int c, size_t count)
393 while (count && !IS_ALIGNED((unsigned long)dst, 8)) {
394 __raw_writeb(c, dst);
400 __raw_writeq(qc, dst);
406 __raw_writeb(c, dst);
411 #endif /* CONFIG_ARM64 */
414 #define memset_io(a, b, c) __memset_io((a), (b), (c))
415 #define memcpy_fromio(a, b, c) __memcpy_fromio((a), (b), (c))
416 #define memcpy_toio(a, b, c) __memcpy_toio((a), (b), (c))
418 #define memset_io(a, b, c) memset((void *)(a), (b), (c))
419 #define memcpy_fromio(a, b, c) memcpy((a), (void *)(b), (c))
420 #define memcpy_toio(a, b, c) memcpy((void *)(a), (b), (c))
424 * If this architecture has ISA IO, then define the isa_read/isa_write
429 #define isa_readb(addr) __raw_readb(__mem_isa(addr))
430 #define isa_readw(addr) __raw_readw(__mem_isa(addr))
431 #define isa_readl(addr) __raw_readl(__mem_isa(addr))
432 #define isa_writeb(val,addr) __raw_writeb(val,__mem_isa(addr))
433 #define isa_writew(val,addr) __raw_writew(val,__mem_isa(addr))
434 #define isa_writel(val,addr) __raw_writel(val,__mem_isa(addr))
435 #define isa_memset_io(a,b,c) _memset_io(__mem_isa(a),(b),(c))
436 #define isa_memcpy_fromio(a,b,c) _memcpy_fromio((a),__mem_isa(b),(c))
437 #define isa_memcpy_toio(a,b,c) _memcpy_toio(__mem_isa((a)),(b),(c))
439 #define isa_eth_io_copy_and_sum(a,b,c,d) \
440 eth_copy_and_sum((a),__mem_isa(b),(c),(d))
443 isa_check_signature(unsigned long io_addr, const unsigned char *signature,
448 if (isa_readb(io_addr) != *signature)
459 #else /* __mem_isa */
461 #define isa_readb(addr) (__readwrite_bug("isa_readb"),0)
462 #define isa_readw(addr) (__readwrite_bug("isa_readw"),0)
463 #define isa_readl(addr) (__readwrite_bug("isa_readl"),0)
464 #define isa_writeb(val,addr) __readwrite_bug("isa_writeb")
465 #define isa_writew(val,addr) __readwrite_bug("isa_writew")
466 #define isa_writel(val,addr) __readwrite_bug("isa_writel")
467 #define isa_memset_io(a,b,c) __readwrite_bug("isa_memset_io")
468 #define isa_memcpy_fromio(a,b,c) __readwrite_bug("isa_memcpy_fromio")
469 #define isa_memcpy_toio(a,b,c) __readwrite_bug("isa_memcpy_toio")
471 #define isa_eth_io_copy_and_sum(a,b,c,d) \
472 __readwrite_bug("isa_eth_io_copy_and_sum")
474 #define isa_check_signature(io,sig,len) (0)
476 #endif /* __mem_isa */
477 #endif /* __KERNEL__ */
479 #include <asm-generic/io.h>
482 #endif /* __ASM_ARM_IO_H */