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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/include/asm-arm/io.h
3 *
4 * Copyright (C) 1996-2000 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 * 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
19 * 05-Oct-2004 BJD Moved memory string functions to use void __iomem
20 */
21#ifndef __ASM_ARM_IO_H
22#define __ASM_ARM_IO_H
23
24#ifdef __KERNEL__
25
26#include <linux/types.h>
27#include <asm/byteorder.h>
28#include <asm/memory.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
30/*
31 * ISA I/O bus memory addresses are 1:1 with the physical address.
32 */
33#define isa_virt_to_bus virt_to_phys
34#define isa_page_to_bus page_to_phys
35#define isa_bus_to_virt phys_to_virt
36
37/*
38 * Generic IO read/write. These perform native-endian accesses. Note
39 * that some architectures will want to re-define __raw_{read,write}w.
40 */
41extern void __raw_writesb(void __iomem *addr, const void *data, int bytelen);
42extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen);
43extern void __raw_writesl(void __iomem *addr, const void *data, int longlen);
44
Deepak Saxenaa0d95af2005-12-05 10:54:59 +000045extern void __raw_readsb(const void __iomem *addr, void *data, int bytelen);
46extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
47extern void __raw_readsl(const void __iomem *addr, void *data, int longlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49#define __raw_writeb(v,a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a) = (v))
50#define __raw_writew(v,a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v))
51#define __raw_writel(v,a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a) = (v))
52
53#define __raw_readb(a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a))
54#define __raw_readw(a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a))
55#define __raw_readl(a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a))
56
57/*
Russell King67a19012005-11-17 16:48:00 +000058 * Architecture ioremap implementation.
Deepak Saxena9d4ae722006-01-09 19:23:11 +000059 *
60 * __ioremap takes CPU physical address.
61 *
62 * __ioremap_pfn takes a Page Frame Number and an offset into that page
Russell King67a19012005-11-17 16:48:00 +000063 */
Deepak Saxena9d4ae722006-01-09 19:23:11 +000064extern void __iomem * __ioremap_pfn(unsigned long, unsigned long, size_t, unsigned long);
Russell King67a19012005-11-17 16:48:00 +000065extern void __iomem * __ioremap(unsigned long, size_t, unsigned long);
66extern void __iounmap(void __iomem *addr);
67
68/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 * Bad read/write accesses...
70 */
71extern void __readwrite_bug(const char *fn);
72
73/*
74 * Now, pick up the machine-defined IO definitions
75 */
76#include <asm/arch/io.h>
77
78#ifdef __io_pci
79#warning machine class uses buggy __io_pci
80#endif
81#if defined(__arch_putb) || defined(__arch_putw) || defined(__arch_putl) || \
82 defined(__arch_getb) || defined(__arch_getw) || defined(__arch_getl)
83#warning machine class uses old __arch_putw or __arch_getw
84#endif
85
86/*
87 * IO port access primitives
88 * -------------------------
89 *
90 * The ARM doesn't have special IO access instructions; all IO is memory
91 * mapped. Note that these are defined to perform little endian accesses
92 * only. Their primary purpose is to access PCI and ISA peripherals.
93 *
94 * Note that for a big endian machine, this implies that the following
Russell Kingc79ebfa2005-06-27 14:23:38 +010095 * big endian mode connectivity is in place, as described by numerous
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 * ARM documents:
97 *
98 * PCI: D0-D7 D8-D15 D16-D23 D24-D31
99 * ARM: D24-D31 D16-D23 D8-D15 D0-D7
100 *
101 * The machine specific io.h include defines __io to translate an "IO"
102 * address to a memory address.
103 *
104 * Note that we prevent GCC re-ordering or caching values in expressions
105 * by introducing sequence points into the in*() definitions. Note that
106 * __raw_* do not guarantee this behaviour.
107 *
108 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
109 */
110#ifdef __io
111#define outb(v,p) __raw_writeb(v,__io(p))
Olav Kongas05f98692005-04-29 22:08:34 +0100112#define outw(v,p) __raw_writew((__force __u16) \
113 cpu_to_le16(v),__io(p))
114#define outl(v,p) __raw_writel((__force __u32) \
115 cpu_to_le32(v),__io(p))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Olav Kongas05f98692005-04-29 22:08:34 +0100117#define inb(p) ({ __u8 __v = __raw_readb(__io(p)); __v; })
118#define inw(p) ({ __u16 __v = le16_to_cpu((__force __le16) \
119 __raw_readw(__io(p))); __v; })
120#define inl(p) ({ __u32 __v = le32_to_cpu((__force __le32) \
121 __raw_readl(__io(p))); __v; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
123#define outsb(p,d,l) __raw_writesb(__io(p),d,l)
124#define outsw(p,d,l) __raw_writesw(__io(p),d,l)
125#define outsl(p,d,l) __raw_writesl(__io(p),d,l)
126
127#define insb(p,d,l) __raw_readsb(__io(p),d,l)
128#define insw(p,d,l) __raw_readsw(__io(p),d,l)
129#define insl(p,d,l) __raw_readsl(__io(p),d,l)
130#endif
131
132#define outb_p(val,port) outb((val),(port))
133#define outw_p(val,port) outw((val),(port))
134#define outl_p(val,port) outl((val),(port))
135#define inb_p(port) inb((port))
136#define inw_p(port) inw((port))
137#define inl_p(port) inl((port))
138
139#define outsb_p(port,from,len) outsb(port,from,len)
140#define outsw_p(port,from,len) outsw(port,from,len)
141#define outsl_p(port,from,len) outsl(port,from,len)
142#define insb_p(port,to,len) insb(port,to,len)
143#define insw_p(port,to,len) insw(port,to,len)
144#define insl_p(port,to,len) insl(port,to,len)
145
146/*
147 * String version of IO memory access ops:
148 */
Russell Kingd2f60742005-09-24 10:42:06 +0100149extern void _memcpy_fromio(void *, const volatile void __iomem *, size_t);
150extern void _memcpy_toio(volatile void __iomem *, const void *, size_t);
151extern void _memset_io(volatile void __iomem *, int, size_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
153#define mmiowb()
154
155/*
156 * Memory access primitives
157 * ------------------------
158 *
159 * These perform PCI memory accesses via an ioremap region. They don't
160 * take an address as such, but a cookie.
161 *
162 * Again, this are defined to perform little endian accesses. See the
163 * IO port primitives for more information.
164 */
165#ifdef __mem_pci
Olav Kongas05f98692005-04-29 22:08:34 +0100166#define readb(c) ({ __u8 __v = __raw_readb(__mem_pci(c)); __v; })
167#define readw(c) ({ __u16 __v = le16_to_cpu((__force __le16) \
168 __raw_readw(__mem_pci(c))); __v; })
169#define readl(c) ({ __u32 __v = le32_to_cpu((__force __le32) \
170 __raw_readl(__mem_pci(c))); __v; })
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171#define readb_relaxed(addr) readb(addr)
172#define readw_relaxed(addr) readw(addr)
173#define readl_relaxed(addr) readl(addr)
174
175#define readsb(p,d,l) __raw_readsb(__mem_pci(p),d,l)
176#define readsw(p,d,l) __raw_readsw(__mem_pci(p),d,l)
177#define readsl(p,d,l) __raw_readsl(__mem_pci(p),d,l)
178
179#define writeb(v,c) __raw_writeb(v,__mem_pci(c))
Olav Kongas05f98692005-04-29 22:08:34 +0100180#define writew(v,c) __raw_writew((__force __u16) \
181 cpu_to_le16(v),__mem_pci(c))
182#define writel(v,c) __raw_writel((__force __u32) \
183 cpu_to_le32(v),__mem_pci(c))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185#define writesb(p,d,l) __raw_writesb(__mem_pci(p),d,l)
186#define writesw(p,d,l) __raw_writesw(__mem_pci(p),d,l)
187#define writesl(p,d,l) __raw_writesl(__mem_pci(p),d,l)
188
189#define memset_io(c,v,l) _memset_io(__mem_pci(c),(v),(l))
190#define memcpy_fromio(a,c,l) _memcpy_fromio((a),__mem_pci(c),(l))
191#define memcpy_toio(c,a,l) _memcpy_toio(__mem_pci(c),(a),(l))
192
193#define eth_io_copy_and_sum(s,c,l,b) \
194 eth_copy_and_sum((s),__mem_pci(c),(l),(b))
195
196static inline int
197check_signature(void __iomem *io_addr, const unsigned char *signature,
198 int length)
199{
200 int retval = 0;
201 do {
202 if (readb(io_addr) != *signature)
203 goto out;
204 io_addr++;
205 signature++;
206 length--;
207 } while (length);
208 retval = 1;
209out:
210 return retval;
211}
212
213#elif !defined(readb)
214
215#define readb(c) (__readwrite_bug("readb"),0)
216#define readw(c) (__readwrite_bug("readw"),0)
217#define readl(c) (__readwrite_bug("readl"),0)
218#define writeb(v,c) __readwrite_bug("writeb")
219#define writew(v,c) __readwrite_bug("writew")
220#define writel(v,c) __readwrite_bug("writel")
221
222#define eth_io_copy_and_sum(s,c,l,b) __readwrite_bug("eth_io_copy_and_sum")
223
224#define check_signature(io,sig,len) (0)
225
226#endif /* __mem_pci */
227
228/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 * ioremap and friends.
230 *
231 * ioremap takes a PCI memory address, as specified in
232 * Documentation/IO-mapping.txt.
Deepak Saxena9d4ae722006-01-09 19:23:11 +0000233 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235#ifndef __arch_ioremap
Russell King67a19012005-11-17 16:48:00 +0000236#define ioremap(cookie,size) __ioremap(cookie,size,0)
237#define ioremap_nocache(cookie,size) __ioremap(cookie,size,0)
238#define ioremap_cached(cookie,size) __ioremap(cookie,size,L_PTE_CACHEABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239#define iounmap(cookie) __iounmap(cookie)
240#else
Russell King67a19012005-11-17 16:48:00 +0000241#define ioremap(cookie,size) __arch_ioremap((cookie),(size),0)
242#define ioremap_nocache(cookie,size) __arch_ioremap((cookie),(size),0)
243#define ioremap_cached(cookie,size) __arch_ioremap((cookie),(size),L_PTE_CACHEABLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244#define iounmap(cookie) __arch_iounmap(cookie)
245#endif
246
247/*
Russell King09f05512005-06-20 18:44:37 +0100248 * io{read,write}{8,16,32} macros
249 */
Lennert Buytenhek7533fca2005-06-24 23:11:31 +0100250#ifndef ioread8
Russell King09f05512005-06-20 18:44:37 +0100251#define ioread8(p) ({ unsigned int __v = __raw_readb(p); __v; })
252#define ioread16(p) ({ unsigned int __v = le16_to_cpu(__raw_readw(p)); __v; })
253#define ioread32(p) ({ unsigned int __v = le32_to_cpu(__raw_readl(p)); __v; })
254
255#define iowrite8(v,p) __raw_writeb(v, p)
256#define iowrite16(v,p) __raw_writew(cpu_to_le16(v), p)
257#define iowrite32(v,p) __raw_writel(cpu_to_le32(v), p)
258
259#define ioread8_rep(p,d,c) __raw_readsb(p,d,c)
260#define ioread16_rep(p,d,c) __raw_readsw(p,d,c)
261#define ioread32_rep(p,d,c) __raw_readsl(p,d,c)
262
263#define iowrite8_rep(p,s,c) __raw_writesb(p,s,c)
264#define iowrite16_rep(p,s,c) __raw_writesw(p,s,c)
265#define iowrite32_rep(p,s,c) __raw_writesl(p,s,c)
266
267extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
268extern void ioport_unmap(void __iomem *addr);
Lennert Buytenhek7533fca2005-06-24 23:11:31 +0100269#endif
Russell King09f05512005-06-20 18:44:37 +0100270
271struct pci_dev;
272
273extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen);
274extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
275
276/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 * can the hardware map this into one segment or not, given no other
278 * constraints.
279 */
280#define BIOVEC_MERGEABLE(vec1, vec2) \
281 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
282
283/*
284 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
285 * access
286 */
287#define xlate_dev_mem_ptr(p) __va(p)
288
289/*
290 * Convert a virtual cached pointer to an uncached pointer
291 */
292#define xlate_dev_kmem_ptr(p) p
293
294#endif /* __KERNEL__ */
295#endif /* __ASM_ARM_IO_H */