1 /* Generic I/O port emulation, based on MN10300 code
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
11 #ifndef __ASM_GENERIC_IO_H
12 #define __ASM_GENERIC_IO_H
14 #include <asm/page.h> /* I/O is all done through memory accesses */
15 #include <asm/cacheflush.h>
16 #include <linux/types.h>
18 #ifdef CONFIG_GENERIC_IOMAP
19 #include <asm-generic/iomap.h>
22 #include <asm-generic/pci_iomap.h>
25 #define mmiowb() do {} while (0)
28 /*****************************************************************************/
30 * readX/writeX() are used to access memory mapped devices. On some
31 * architectures the memory mapped IO stuff needs to be accessed
32 * differently. On the simple architectures, we just read/write the
33 * memory location directly.
36 static inline u8 __raw_readb(const volatile void __iomem *addr)
38 return *(const volatile u8 __force *) addr;
43 static inline u16 __raw_readw(const volatile void __iomem *addr)
45 return *(const volatile u16 __force *) addr;
50 static inline u32 __raw_readl(const volatile void __iomem *addr)
52 return *(const volatile u32 __force *) addr;
56 #define readb __raw_readb
57 #define readw(addr) __le16_to_cpu(__raw_readw(addr))
58 #define readl(addr) __le32_to_cpu(__raw_readl(addr))
61 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
63 *(volatile u8 __force *) addr = b;
68 static inline void __raw_writew(u16 b, volatile void __iomem *addr)
70 *(volatile u16 __force *) addr = b;
75 static inline void __raw_writel(u32 b, volatile void __iomem *addr)
77 *(volatile u32 __force *) addr = b;
81 #define writeb __raw_writeb
82 #define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
83 #define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
87 static inline u64 __raw_readq(const volatile void __iomem *addr)
89 return *(const volatile u64 __force *) addr;
93 #define readq(addr) __le64_to_cpu(__raw_readq(addr))
96 static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
98 *(volatile u64 __force *) addr = b;
102 #define writeq(b, addr) __raw_writeq(__cpu_to_le64(b), addr)
103 #endif /* CONFIG_64BIT */
106 #define PCI_IOBASE ((void __iomem *) 0)
109 /*****************************************************************************/
111 * traditional input/output functions
114 static inline u8 inb(unsigned long addr)
116 return readb(addr + PCI_IOBASE);
119 static inline u16 inw(unsigned long addr)
121 return readw(addr + PCI_IOBASE);
124 static inline u32 inl(unsigned long addr)
126 return readl(addr + PCI_IOBASE);
129 static inline void outb(u8 b, unsigned long addr)
131 writeb(b, addr + PCI_IOBASE);
134 static inline void outw(u16 b, unsigned long addr)
136 writew(b, addr + PCI_IOBASE);
139 static inline void outl(u32 b, unsigned long addr)
141 writel(b, addr + PCI_IOBASE);
144 #define inb_p(addr) inb(addr)
145 #define inw_p(addr) inw(addr)
146 #define inl_p(addr) inl(addr)
147 #define outb_p(x, addr) outb((x), (addr))
148 #define outw_p(x, addr) outw((x), (addr))
149 #define outl_p(x, addr) outl((x), (addr))
152 static inline void insb(unsigned long addr, void *buffer, int count)
157 u8 x = __raw_readb(addr + PCI_IOBASE);
165 static inline void insw(unsigned long addr, void *buffer, int count)
170 u16 x = __raw_readw(addr + PCI_IOBASE);
178 static inline void insl(unsigned long addr, void *buffer, int count)
183 u32 x = __raw_readl(addr + PCI_IOBASE);
191 static inline void outsb(unsigned long addr, const void *buffer, int count)
194 const u8 *buf = buffer;
196 __raw_writeb(*buf++, addr + PCI_IOBASE);
203 static inline void outsw(unsigned long addr, const void *buffer, int count)
206 const u16 *buf = buffer;
208 __raw_writew(*buf++, addr + PCI_IOBASE);
215 static inline void outsl(unsigned long addr, const void *buffer, int count)
218 const u32 *buf = buffer;
220 __raw_writel(*buf++, addr + PCI_IOBASE);
226 static inline void readsl(const void __iomem *addr, void *buf, int len)
228 insl(addr - PCI_IOBASE, buf, len);
231 static inline void readsw(const void __iomem *addr, void *buf, int len)
233 insw(addr - PCI_IOBASE, buf, len);
236 static inline void readsb(const void __iomem *addr, void *buf, int len)
238 insb(addr - PCI_IOBASE, buf, len);
241 static inline void writesl(const void __iomem *addr, const void *buf, int len)
243 outsl(addr - PCI_IOBASE, buf, len);
246 static inline void writesw(const void __iomem *addr, const void *buf, int len)
248 outsw(addr - PCI_IOBASE, buf, len);
251 static inline void writesb(const void __iomem *addr, const void *buf, int len)
253 outsb(addr - PCI_IOBASE, buf, len);
256 #ifndef CONFIG_GENERIC_IOMAP
257 #define ioread8(addr) readb(addr)
258 #define ioread16(addr) readw(addr)
259 #define ioread16be(addr) be16_to_cpu(ioread16(addr))
260 #define ioread32(addr) readl(addr)
261 #define ioread32be(addr) be32_to_cpu(ioread32(addr))
263 #define iowrite8(v, addr) writeb((v), (addr))
264 #define iowrite16(v, addr) writew((v), (addr))
265 #define iowrite16be(v, addr) iowrite16(be16_to_cpu(v), (addr))
266 #define iowrite32(v, addr) writel((v), (addr))
267 #define iowrite32be(v, addr) iowrite32(be32_to_cpu(v), (addr))
269 #define ioread8_rep(p, dst, count) \
270 insb((unsigned long) (p), (dst), (count))
271 #define ioread16_rep(p, dst, count) \
272 insw((unsigned long) (p), (dst), (count))
273 #define ioread32_rep(p, dst, count) \
274 insl((unsigned long) (p), (dst), (count))
276 #define iowrite8_rep(p, src, count) \
277 outsb((unsigned long) (p), (src), (count))
278 #define iowrite16_rep(p, src, count) \
279 outsw((unsigned long) (p), (src), (count))
280 #define iowrite32_rep(p, src, count) \
281 outsl((unsigned long) (p), (src), (count))
282 #endif /* CONFIG_GENERIC_IOMAP */
284 #ifndef IO_SPACE_LIMIT
285 #define IO_SPACE_LIMIT 0xffff
290 #include <linux/vmalloc.h>
291 #define __io_virt(x) ((void __force *) (x))
293 #ifndef CONFIG_GENERIC_IOMAP
295 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
298 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
302 #endif /* CONFIG_GENERIC_IOMAP */
305 * Change virtual addresses to physical addresses and vv.
306 * These are pretty trivial
309 static inline unsigned long virt_to_phys(volatile void *address)
311 return __pa((unsigned long)address);
314 static inline void *phys_to_virt(unsigned long address)
316 return __va(address);
321 * Change "struct page" to physical address.
323 * This implementation is for the no-MMU case only... if you have an MMU
324 * you'll need to provide your own definitions.
327 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
329 return (void __iomem*) (unsigned long)offset;
332 #define __ioremap(offset, size, flags) ioremap(offset, size)
334 #ifndef ioremap_nocache
335 #define ioremap_nocache ioremap
339 #define ioremap_wc ioremap_nocache
342 static inline void iounmap(void __iomem *addr)
345 #endif /* CONFIG_MMU */
347 #ifdef CONFIG_HAS_IOPORT
348 #ifndef CONFIG_GENERIC_IOMAP
349 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
351 return (void __iomem *) port;
354 static inline void ioport_unmap(void __iomem *p)
357 #else /* CONFIG_GENERIC_IOMAP */
358 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
359 extern void ioport_unmap(void __iomem *p);
360 #endif /* CONFIG_GENERIC_IOMAP */
361 #endif /* CONFIG_HAS_IOPORT */
363 #define xlate_dev_kmem_ptr(p) p
364 #define xlate_dev_mem_ptr(p) __va(p)
367 static inline unsigned long virt_to_bus(volatile void *address)
369 return ((unsigned long) address);
372 static inline void *bus_to_virt(unsigned long address)
374 return (void *) address;
379 #define memset_io(a, b, c) memset(__io_virt(a), (b), (c))
382 #ifndef memcpy_fromio
383 #define memcpy_fromio(a, b, c) memcpy((a), __io_virt(b), (c))
386 #define memcpy_toio(a, b, c) memcpy(__io_virt(a), (b), (c))
389 #endif /* __KERNEL__ */
391 #endif /* __ASM_GENERIC_IO_H */