Root/include/asm-generic/io.h

1/* Generic I/O port emulation, based on MN10300 code
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11#ifndef __ASM_GENERIC_IO_H
12#define __ASM_GENERIC_IO_H
13
14#include <asm/page.h> /* I/O is all done through memory accesses */
15#include <asm/cacheflush.h>
16#include <linux/types.h>
17
18#ifdef CONFIG_GENERIC_IOMAP
19#include <asm-generic/iomap.h>
20#endif
21
22#ifndef mmiowb
23#define mmiowb() do {} while (0)
24#endif
25
26/*****************************************************************************/
27/*
28 * readX/writeX() are used to access memory mapped devices. On some
29 * architectures the memory mapped IO stuff needs to be accessed
30 * differently. On the simple architectures, we just read/write the
31 * memory location directly.
32 */
33#ifndef __raw_readb
34static inline u8 __raw_readb(const volatile void __iomem *addr)
35{
36    return *(const volatile u8 __force *) addr;
37}
38#endif
39
40#ifndef __raw_readw
41static inline u16 __raw_readw(const volatile void __iomem *addr)
42{
43    return *(const volatile u16 __force *) addr;
44}
45#endif
46
47#ifndef __raw_readl
48static inline u32 __raw_readl(const volatile void __iomem *addr)
49{
50    return *(const volatile u32 __force *) addr;
51}
52#endif
53
54#define readb __raw_readb
55#define readw(addr) __le16_to_cpu(__raw_readw(addr))
56#define readl(addr) __le32_to_cpu(__raw_readl(addr))
57
58#ifndef __raw_writeb
59static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
60{
61    *(volatile u8 __force *) addr = b;
62}
63#endif
64
65#ifndef __raw_writew
66static inline void __raw_writew(u16 b, volatile void __iomem *addr)
67{
68    *(volatile u16 __force *) addr = b;
69}
70#endif
71
72#ifndef __raw_writel
73static inline void __raw_writel(u32 b, volatile void __iomem *addr)
74{
75    *(volatile u32 __force *) addr = b;
76}
77#endif
78
79#define writeb __raw_writeb
80#define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
81#define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
82
83#ifdef CONFIG_64BIT
84static inline u64 __raw_readq(const volatile void __iomem *addr)
85{
86    return *(const volatile u64 __force *) addr;
87}
88#define readq(addr) __le64_to_cpu(__raw_readq(addr))
89
90static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
91{
92    *(volatile u64 __force *) addr = b;
93}
94#define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
95#endif
96
97/*****************************************************************************/
98/*
99 * traditional input/output functions
100 */
101
102static inline u8 inb(unsigned long addr)
103{
104    return readb((volatile void __iomem *) addr);
105}
106
107static inline u16 inw(unsigned long addr)
108{
109    return readw((volatile void __iomem *) addr);
110}
111
112static inline u32 inl(unsigned long addr)
113{
114    return readl((volatile void __iomem *) addr);
115}
116
117static inline void outb(u8 b, unsigned long addr)
118{
119    writeb(b, (volatile void __iomem *) addr);
120}
121
122static inline void outw(u16 b, unsigned long addr)
123{
124    writew(b, (volatile void __iomem *) addr);
125}
126
127static inline void outl(u32 b, unsigned long addr)
128{
129    writel(b, (volatile void __iomem *) addr);
130}
131
132#define inb_p(addr) inb(addr)
133#define inw_p(addr) inw(addr)
134#define inl_p(addr) inl(addr)
135#define outb_p(x, addr) outb((x), (addr))
136#define outw_p(x, addr) outw((x), (addr))
137#define outl_p(x, addr) outl((x), (addr))
138
139#ifndef insb
140static inline void insb(unsigned long addr, void *buffer, int count)
141{
142    if (count) {
143        u8 *buf = buffer;
144        do {
145            u8 x = inb(addr);
146            *buf++ = x;
147        } while (--count);
148    }
149}
150#endif
151
152#ifndef insw
153static inline void insw(unsigned long addr, void *buffer, int count)
154{
155    if (count) {
156        u16 *buf = buffer;
157        do {
158            u16 x = inw(addr);
159            *buf++ = x;
160        } while (--count);
161    }
162}
163#endif
164
165#ifndef insl
166static inline void insl(unsigned long addr, void *buffer, int count)
167{
168    if (count) {
169        u32 *buf = buffer;
170        do {
171            u32 x = inl(addr);
172            *buf++ = x;
173        } while (--count);
174    }
175}
176#endif
177
178#ifndef outsb
179static inline void outsb(unsigned long addr, const void *buffer, int count)
180{
181    if (count) {
182        const u8 *buf = buffer;
183        do {
184            outb(*buf++, addr);
185        } while (--count);
186    }
187}
188#endif
189
190#ifndef outsw
191static inline void outsw(unsigned long addr, const void *buffer, int count)
192{
193    if (count) {
194        const u16 *buf = buffer;
195        do {
196            outw(*buf++, addr);
197        } while (--count);
198    }
199}
200#endif
201
202#ifndef outsl
203static inline void outsl(unsigned long addr, const void *buffer, int count)
204{
205    if (count) {
206        const u32 *buf = buffer;
207        do {
208            outl(*buf++, addr);
209        } while (--count);
210    }
211}
212#endif
213
214#ifndef CONFIG_GENERIC_IOMAP
215#define ioread8(addr) readb(addr)
216#define ioread16(addr) readw(addr)
217#define ioread16be(addr) be16_to_cpu(ioread16(addr))
218#define ioread32(addr) readl(addr)
219#define ioread32be(addr) be32_to_cpu(ioread32(addr))
220
221#define iowrite8(v, addr) writeb((v), (addr))
222#define iowrite16(v, addr) writew((v), (addr))
223#define iowrite16be(v, addr) iowrite16(be16_to_cpu(v), (addr))
224#define iowrite32(v, addr) writel((v), (addr))
225#define iowrite32be(v, addr) iowrite32(be32_to_cpu(v), (addr))
226
227#define ioread8_rep(p, dst, count) \
228    insb((unsigned long) (p), (dst), (count))
229#define ioread16_rep(p, dst, count) \
230    insw((unsigned long) (p), (dst), (count))
231#define ioread32_rep(p, dst, count) \
232    insl((unsigned long) (p), (dst), (count))
233
234#define iowrite8_rep(p, src, count) \
235    outsb((unsigned long) (p), (src), (count))
236#define iowrite16_rep(p, src, count) \
237    outsw((unsigned long) (p), (src), (count))
238#define iowrite32_rep(p, src, count) \
239    outsl((unsigned long) (p), (src), (count))
240#endif /* CONFIG_GENERIC_IOMAP */
241
242
243#define IO_SPACE_LIMIT 0xffffffff
244
245#ifdef __KERNEL__
246
247#include <linux/vmalloc.h>
248#define __io_virt(x) ((void __force *) (x))
249
250#ifndef CONFIG_GENERIC_IOMAP
251/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
252struct pci_dev;
253extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
254static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
255{
256}
257#endif /* CONFIG_GENERIC_IOMAP */
258
259/*
260 * Change virtual addresses to physical addresses and vv.
261 * These are pretty trivial
262 */
263static inline unsigned long virt_to_phys(volatile void *address)
264{
265    return __pa((unsigned long)address);
266}
267
268static inline void *phys_to_virt(unsigned long address)
269{
270    return __va(address);
271}
272
273/*
274 * Change "struct page" to physical address.
275 */
276static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
277{
278    return (void __iomem*) (unsigned long)offset;
279}
280
281#define __ioremap(offset, size, flags) ioremap(offset, size)
282
283#ifndef ioremap_nocache
284#define ioremap_nocache ioremap
285#endif
286
287#ifndef ioremap_wc
288#define ioremap_wc ioremap_nocache
289#endif
290
291static inline void iounmap(void *addr)
292{
293}
294
295#ifndef CONFIG_GENERIC_IOMAP
296static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
297{
298    return (void __iomem *) port;
299}
300
301static inline void ioport_unmap(void __iomem *p)
302{
303}
304#else /* CONFIG_GENERIC_IOMAP */
305extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
306extern void ioport_unmap(void __iomem *p);
307#endif /* CONFIG_GENERIC_IOMAP */
308
309#define xlate_dev_kmem_ptr(p) p
310#define xlate_dev_mem_ptr(p) ((void *) (p))
311
312#ifndef virt_to_bus
313static inline unsigned long virt_to_bus(volatile void *address)
314{
315    return ((unsigned long) address);
316}
317
318static inline void *bus_to_virt(unsigned long address)
319{
320    return (void *) address;
321}
322#endif
323
324#define memset_io(a, b, c) memset(__io_virt(a), (b), (c))
325#define memcpy_fromio(a, b, c) memcpy((a), __io_virt(b), (c))
326#define memcpy_toio(a, b, c) memcpy(__io_virt(a), (b), (c))
327
328#endif /* __KERNEL__ */
329
330#endif /* __ASM_GENERIC_IO_H */
331

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