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>
23 #define mmiowb() do {} while (0)
26 /*****************************************************************************/
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.
34 static inline u8 __raw_readb(const volatile void __iomem *addr)
36 return *(const volatile u8 __force *) addr;
41 static inline u16 __raw_readw(const volatile void __iomem *addr)
43 return *(const volatile u16 __force *) addr;
48 static inline u32 __raw_readl(const volatile void __iomem *addr)
50 return *(const volatile u32 __force *) addr;
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))
59 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
61 *(volatile u8 __force *) addr = b;
66 static inline void __raw_writew(u16 b, volatile void __iomem *addr)
68 *(volatile u16 __force *) addr = b;
73 static inline void __raw_writel(u32 b, volatile void __iomem *addr)
75 *(volatile u32 __force *) addr = b;
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)
84 static inline u64 __raw_readq(const volatile void __iomem *addr)
86 return *(const volatile u64 __force *) addr;
88 #define readq(addr) __le64_to_cpu(__raw_readq(addr))
90 static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
92 *(volatile u64 __force *) addr = b;
94 #define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
98 #define PCI_IOBASE ((void __iomem *) 0)
101 /*****************************************************************************/
103 * traditional input/output functions
106 static inline u8 inb(unsigned long addr)
108 return readb(addr + PCI_IOBASE);
111 static inline u16 inw(unsigned long addr)
113 return readw(addr + PCI_IOBASE);
116 static inline u32 inl(unsigned long addr)
118 return readl(addr + PCI_IOBASE);
121 static inline void outb(u8 b, unsigned long addr)
123 writeb(b, addr + PCI_IOBASE);
126 static inline void outw(u16 b, unsigned long addr)
128 writew(b, addr + PCI_IOBASE);
131 static inline void outl(u32 b, unsigned long addr)
133 writel(b, addr + PCI_IOBASE);
136 #define inb_p(addr) inb(addr)
137 #define inw_p(addr) inw(addr)
138 #define inl_p(addr) inl(addr)
139 #define outb_p(x, addr) outb((x), (addr))
140 #define outw_p(x, addr) outw((x), (addr))
141 #define outl_p(x, addr) outl((x), (addr))
144 static inline void insb(unsigned long addr, void *buffer, int count)
157 static inline void insw(unsigned long addr, void *buffer, int count)
170 static inline void insl(unsigned long addr, void *buffer, int count)
183 static inline void outsb(unsigned long addr, const void *buffer, int count)
186 const u8 *buf = buffer;
195 static inline void outsw(unsigned long addr, const void *buffer, int count)
198 const u16 *buf = buffer;
207 static inline void outsl(unsigned long addr, const void *buffer, int count)
210 const u32 *buf = buffer;
218 static inline void readsl(const void __iomem *addr, void *buf, int len)
220 insl(addr - PCI_IOBASE, buf, len);
223 static inline void readsw(const void __iomem *addr, void *buf, int len)
225 insw(addr - PCI_IOBASE, buf, len);
228 static inline void readsb(const void __iomem *addr, void *buf, int len)
230 insb(addr - PCI_IOBASE, buf, len);
233 static inline void writesl(const void __iomem *addr, const void *buf, int len)
235 outsl(addr - PCI_IOBASE, buf, len);
238 static inline void writesw(const void __iomem *addr, const void *buf, int len)
240 outsw(addr - PCI_IOBASE, buf, len);
243 static inline void writesb(const void __iomem *addr, const void *buf, int len)
245 outsb(addr - PCI_IOBASE, buf, len);
248 #ifndef CONFIG_GENERIC_IOMAP
249 #define ioread8(addr) readb(addr)
250 #define ioread16(addr) readw(addr)
251 #define ioread16be(addr) be16_to_cpu(ioread16(addr))
252 #define ioread32(addr) readl(addr)
253 #define ioread32be(addr) be32_to_cpu(ioread32(addr))
255 #define iowrite8(v, addr) writeb((v), (addr))
256 #define iowrite16(v, addr) writew((v), (addr))
257 #define iowrite16be(v, addr) iowrite16(be16_to_cpu(v), (addr))
258 #define iowrite32(v, addr) writel((v), (addr))
259 #define iowrite32be(v, addr) iowrite32(be32_to_cpu(v), (addr))
261 #define ioread8_rep(p, dst, count) \
262 insb((unsigned long) (p), (dst), (count))
263 #define ioread16_rep(p, dst, count) \
264 insw((unsigned long) (p), (dst), (count))
265 #define ioread32_rep(p, dst, count) \
266 insl((unsigned long) (p), (dst), (count))
268 #define iowrite8_rep(p, src, count) \
269 outsb((unsigned long) (p), (src), (count))
270 #define iowrite16_rep(p, src, count) \
271 outsw((unsigned long) (p), (src), (count))
272 #define iowrite32_rep(p, src, count) \
273 outsl((unsigned long) (p), (src), (count))
274 #endif /* CONFIG_GENERIC_IOMAP */
276 #ifndef IO_SPACE_LIMIT
277 #define IO_SPACE_LIMIT 0xffff
282 #include <linux/vmalloc.h>
283 #define __io_virt(x) ((void __force *) (x))
285 #ifndef CONFIG_GENERIC_IOMAP
286 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
288 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
289 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
292 #endif /* CONFIG_GENERIC_IOMAP */
295 * Change virtual addresses to physical addresses and vv.
296 * These are pretty trivial
298 static inline unsigned long virt_to_phys(volatile void *address)
300 return __pa((unsigned long)address);
303 static inline void *phys_to_virt(unsigned long address)
305 return __va(address);
309 * Change "struct page" to physical address.
311 * This implementation is for the no-MMU case only... if you have an MMU
312 * you'll need to provide your own definitions.
315 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
317 return (void __iomem*) (unsigned long)offset;
320 #define __ioremap(offset, size, flags) ioremap(offset, size)
322 #ifndef ioremap_nocache
323 #define ioremap_nocache ioremap
327 #define ioremap_wc ioremap_nocache
330 static inline void iounmap(void *addr)
333 #endif /* CONFIG_MMU */
335 #ifdef CONFIG_HAS_IOPORT
336 #ifndef CONFIG_GENERIC_IOMAP
337 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
339 return (void __iomem *) port;
342 static inline void ioport_unmap(void __iomem *p)
345 #else /* CONFIG_GENERIC_IOMAP */
346 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
347 extern void ioport_unmap(void __iomem *p);
348 #endif /* CONFIG_GENERIC_IOMAP */
349 #endif /* CONFIG_HAS_IOPORT */
351 #define xlate_dev_kmem_ptr(p) p
352 #define xlate_dev_mem_ptr(p) __va(p)
355 static inline unsigned long virt_to_bus(volatile void *address)
357 return ((unsigned long) address);
360 static inline void *bus_to_virt(unsigned long address)
362 return (void *) address;
366 #define memset_io(a, b, c) memset(__io_virt(a), (b), (c))
367 #define memcpy_fromio(a, b, c) memcpy((a), __io_virt(b), (c))
368 #define memcpy_toio(a, b, c) memcpy(__io_virt(a), (b), (c))
370 #endif /* __KERNEL__ */
372 #endif /* __ASM_GENERIC_IO_H */