1/* MN10300 I/O port emulation and memory-mapped I/O
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_IO_H
12#define _ASM_IO_H
13
14#include <asm/page.h> /* I/O is all done through memory accesses */
15#include <asm/cpu-regs.h>
16#include <asm/cacheflush.h>
17#include <asm-generic/pci_iomap.h>
18
19#define mmiowb() do {} while (0)
20
21/*****************************************************************************/
22/*
23 * readX/writeX() are used to access memory mapped devices. On some
24 * architectures the memory mapped IO stuff needs to be accessed
25 * differently. On the x86 architecture, we just read/write the
26 * memory location directly.
27 */
28static inline u8 readb(const volatile void __iomem *addr)
29{
30	return *(const volatile u8 *) addr;
31}
32
33static inline u16 readw(const volatile void __iomem *addr)
34{
35	return *(const volatile u16 *) addr;
36}
37
38static inline u32 readl(const volatile void __iomem *addr)
39{
40	return *(const volatile u32 *) addr;
41}
42
43#define __raw_readb readb
44#define __raw_readw readw
45#define __raw_readl readl
46
47#define readb_relaxed readb
48#define readw_relaxed readw
49#define readl_relaxed readl
50
51static inline void writeb(u8 b, volatile void __iomem *addr)
52{
53	*(volatile u8 *) addr = b;
54}
55
56static inline void writew(u16 b, volatile void __iomem *addr)
57{
58	*(volatile u16 *) addr = b;
59}
60
61static inline void writel(u32 b, volatile void __iomem *addr)
62{
63	*(volatile u32 *) addr = b;
64}
65
66#define __raw_writeb writeb
67#define __raw_writew writew
68#define __raw_writel writel
69
70#define writeb_relaxed writeb
71#define writew_relaxed writew
72#define writel_relaxed writel
73
74/*****************************************************************************/
75/*
76 * traditional input/output functions
77 */
78static inline u8 inb_local(unsigned long addr)
79{
80	return readb((volatile void __iomem *) addr);
81}
82
83static inline void outb_local(u8 b, unsigned long addr)
84{
85	return writeb(b, (volatile void __iomem *) addr);
86}
87
88static inline u8 inb(unsigned long addr)
89{
90	return readb((volatile void __iomem *) addr);
91}
92
93static inline u16 inw(unsigned long addr)
94{
95	return readw((volatile void __iomem *) addr);
96}
97
98static inline u32 inl(unsigned long addr)
99{
100	return readl((volatile void __iomem *) addr);
101}
102
103static inline void outb(u8 b, unsigned long addr)
104{
105	return writeb(b, (volatile void __iomem *) addr);
106}
107
108static inline void outw(u16 b, unsigned long addr)
109{
110	return writew(b, (volatile void __iomem *) addr);
111}
112
113static inline void outl(u32 b, unsigned long addr)
114{
115	return writel(b, (volatile void __iomem *) addr);
116}
117
118#define inb_p(addr)	inb(addr)
119#define inw_p(addr)	inw(addr)
120#define inl_p(addr)	inl(addr)
121#define outb_p(x, addr)	outb((x), (addr))
122#define outw_p(x, addr)	outw((x), (addr))
123#define outl_p(x, addr)	outl((x), (addr))
124
125static inline void insb(unsigned long addr, void *buffer, int count)
126{
127	if (count) {
128		u8 *buf = buffer;
129		do {
130			u8 x = inb(addr);
131			*buf++ = x;
132		} while (--count);
133	}
134}
135
136static inline void insw(unsigned long addr, void *buffer, int count)
137{
138	if (count) {
139		u16 *buf = buffer;
140		do {
141			u16 x = inw(addr);
142			*buf++ = x;
143		} while (--count);
144	}
145}
146
147static inline void insl(unsigned long addr, void *buffer, int count)
148{
149	if (count) {
150		u32 *buf = buffer;
151		do {
152			u32 x = inl(addr);
153			*buf++ = x;
154		} while (--count);
155	}
156}
157
158static inline void outsb(unsigned long addr, const void *buffer, int count)
159{
160	if (count) {
161		const u8 *buf = buffer;
162		do {
163			outb(*buf++, addr);
164		} while (--count);
165	}
166}
167
168static inline void outsw(unsigned long addr, const void *buffer, int count)
169{
170	if (count) {
171		const u16 *buf = buffer;
172		do {
173			outw(*buf++, addr);
174		} while (--count);
175	}
176}
177
178extern void __outsl(unsigned long addr, const void *buffer, int count);
179static inline void outsl(unsigned long addr, const void *buffer, int count)
180{
181	if ((unsigned long) buffer & 0x3)
182		return __outsl(addr, buffer, count);
183
184	if (count) {
185		const u32 *buf = buffer;
186		do {
187			outl(*buf++, addr);
188		} while (--count);
189	}
190}
191
192#define ioread8(addr)		readb(addr)
193#define ioread16(addr)		readw(addr)
194#define ioread32(addr)		readl(addr)
195
196#define iowrite8(v, addr)	writeb((v), (addr))
197#define iowrite16(v, addr)	writew((v), (addr))
198#define iowrite32(v, addr)	writel((v), (addr))
199
200#define ioread16be(addr)	be16_to_cpu(readw(addr))
201#define ioread32be(addr)	be32_to_cpu(readl(addr))
202#define iowrite16be(v, addr)	writew(cpu_to_be16(v), (addr))
203#define iowrite32be(v, addr)	writel(cpu_to_be32(v), (addr))
204
205#define ioread8_rep(p, dst, count) \
206	insb((unsigned long) (p), (dst), (count))
207#define ioread16_rep(p, dst, count) \
208	insw((unsigned long) (p), (dst), (count))
209#define ioread32_rep(p, dst, count) \
210	insl((unsigned long) (p), (dst), (count))
211
212#define iowrite8_rep(p, src, count) \
213	outsb((unsigned long) (p), (src), (count))
214#define iowrite16_rep(p, src, count) \
215	outsw((unsigned long) (p), (src), (count))
216#define iowrite32_rep(p, src, count) \
217	outsl((unsigned long) (p), (src), (count))
218
219#define readsb(p, dst, count) \
220	insb((unsigned long) (p), (dst), (count))
221#define readsw(p, dst, count) \
222	insw((unsigned long) (p), (dst), (count))
223#define readsl(p, dst, count) \
224	insl((unsigned long) (p), (dst), (count))
225
226#define writesb(p, src, count) \
227	outsb((unsigned long) (p), (src), (count))
228#define writesw(p, src, count) \
229	outsw((unsigned long) (p), (src), (count))
230#define writesl(p, src, count) \
231	outsl((unsigned long) (p), (src), (count))
232
233#define IO_SPACE_LIMIT 0xffffffff
234
235#ifdef __KERNEL__
236
237#include <linux/vmalloc.h>
238#define __io_virt(x) ((void *) (x))
239
240/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
241struct pci_dev;
242static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
243{
244}
245
246/*
247 * Change virtual addresses to physical addresses and vv.
248 * These are pretty trivial
249 */
250static inline unsigned long virt_to_phys(volatile void *address)
251{
252	return __pa(address);
253}
254
255static inline void *phys_to_virt(unsigned long address)
256{
257	return __va(address);
258}
259
260/*
261 * Change "struct page" to physical address.
262 */
263static inline void __iomem *__ioremap(unsigned long offset, unsigned long size,
264				      unsigned long flags)
265{
266	return (void __iomem *) offset;
267}
268
269static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
270{
271	return (void __iomem *)(offset & ~0x20000000);
272}
273
274/*
275 * This one maps high address device memory and turns off caching for that
276 * area.  it's useful if some control registers are in such an area and write
277 * combining or read caching is not desirable:
278 */
279static inline void __iomem *ioremap_nocache(unsigned long offset, unsigned long size)
280{
281	return (void __iomem *) (offset | 0x20000000);
282}
283
284#define ioremap_wc ioremap_nocache
285#define ioremap_wt ioremap_nocache
286#define ioremap_uc ioremap_nocache
287
288static inline void iounmap(void __iomem *addr)
289{
290}
291
292static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
293{
294	return (void __iomem *) port;
295}
296
297static inline void ioport_unmap(void __iomem *p)
298{
299}
300
301#define xlate_dev_kmem_ptr(p)	((void *) (p))
302#define xlate_dev_mem_ptr(p)	((void *) (p))
303
304/*
305 * PCI bus iomem addresses must be in the region 0x80000000-0x9fffffff
306 */
307static inline unsigned long virt_to_bus(volatile void *address)
308{
309	return ((unsigned long) address) & ~0x20000000;
310}
311
312static inline void *bus_to_virt(unsigned long address)
313{
314	return (void *) address;
315}
316
317#define page_to_bus page_to_phys
318
319#define memset_io(a, b, c)	memset(__io_virt(a), (b), (c))
320#define memcpy_fromio(a, b, c)	memcpy((a), __io_virt(b), (c))
321#define memcpy_toio(a, b, c)	memcpy(__io_virt(a), (b), (c))
322
323#endif /* __KERNEL__ */
324
325#endif /* _ASM_IO_H */
326