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 <linux/types.h>
17 #ifdef CONFIG_GENERIC_IOMAP
18 #include <asm-generic/iomap.h>
21 #include <asm-generic/pci_iomap.h>
24 #define mmiowb() do {} while (0)
27 /*****************************************************************************/
29 * readX/writeX() are used to access memory mapped devices. On some
30 * architectures the memory mapped IO stuff needs to be accessed
31 * differently. On the simple architectures, we just read/write the
32 * memory location directly.
35 static inline u8 __raw_readb(const volatile void __iomem *addr)
37 return *(const volatile u8 __force *) addr;
42 static inline u16 __raw_readw(const volatile void __iomem *addr)
44 return *(const volatile u16 __force *) addr;
49 static inline u32 __raw_readl(const volatile void __iomem *addr)
51 return *(const volatile u32 __force *) addr;
55 #define readb __raw_readb
58 static inline u16 readw(const volatile void __iomem *addr)
60 return __le16_to_cpu(__raw_readw(addr));
64 static inline u32 readl(const volatile void __iomem *addr)
66 return __le32_to_cpu(__raw_readl(addr));
70 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
72 *(volatile u8 __force *) addr = b;
77 static inline void __raw_writew(u16 b, volatile void __iomem *addr)
79 *(volatile u16 __force *) addr = b;
84 static inline void __raw_writel(u32 b, volatile void __iomem *addr)
86 *(volatile u32 __force *) addr = b;
90 #define writeb __raw_writeb
91 #define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
92 #define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
96 static inline u64 __raw_readq(const volatile void __iomem *addr)
98 return *(const volatile u64 __force *) addr;
103 static inline u64 readq(const volatile void __iomem *addr)
105 return __le64_to_cpu(__raw_readq(addr));
109 static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
111 *(volatile u64 __force *) addr = b;
115 #define writeq(b, addr) __raw_writeq(__cpu_to_le64(b), addr)
116 #endif /* CONFIG_64BIT */
119 #define PCI_IOBASE ((void __iomem *) 0)
122 /*****************************************************************************/
124 * traditional input/output functions
127 static inline u8 inb(unsigned long addr)
129 return readb(addr + PCI_IOBASE);
132 static inline u16 inw(unsigned long addr)
134 return readw(addr + PCI_IOBASE);
137 static inline u32 inl(unsigned long addr)
139 return readl(addr + PCI_IOBASE);
142 static inline void outb(u8 b, unsigned long addr)
144 writeb(b, addr + PCI_IOBASE);
147 static inline void outw(u16 b, unsigned long addr)
149 writew(b, addr + PCI_IOBASE);
152 static inline void outl(u32 b, unsigned long addr)
154 writel(b, addr + PCI_IOBASE);
157 #define inb_p(addr) inb(addr)
158 #define inw_p(addr) inw(addr)
159 #define inl_p(addr) inl(addr)
160 #define outb_p(x, addr) outb((x), (addr))
161 #define outw_p(x, addr) outw((x), (addr))
162 #define outl_p(x, addr) outl((x), (addr))
165 static inline void insb(unsigned long addr, void *buffer, int count)
170 u8 x = __raw_readb(addr + PCI_IOBASE);
178 static inline void insw(unsigned long addr, void *buffer, int count)
183 u16 x = __raw_readw(addr + PCI_IOBASE);
191 static inline void insl(unsigned long addr, void *buffer, int count)
196 u32 x = __raw_readl(addr + PCI_IOBASE);
204 static inline void outsb(unsigned long addr, const void *buffer, int count)
207 const u8 *buf = buffer;
209 __raw_writeb(*buf++, addr + PCI_IOBASE);
216 static inline void outsw(unsigned long addr, const void *buffer, int count)
219 const u16 *buf = buffer;
221 __raw_writew(*buf++, addr + PCI_IOBASE);
228 static inline void outsl(unsigned long addr, const void *buffer, int count)
231 const u32 *buf = buffer;
233 __raw_writel(*buf++, addr + PCI_IOBASE);
239 #ifndef CONFIG_GENERIC_IOMAP
240 #define ioread8(addr) readb(addr)
241 #define ioread16(addr) readw(addr)
242 #define ioread16be(addr) __be16_to_cpu(__raw_readw(addr))
243 #define ioread32(addr) readl(addr)
244 #define ioread32be(addr) __be32_to_cpu(__raw_readl(addr))
246 #define iowrite8(v, addr) writeb((v), (addr))
247 #define iowrite16(v, addr) writew((v), (addr))
248 #define iowrite16be(v, addr) __raw_writew(__cpu_to_be16(v), addr)
249 #define iowrite32(v, addr) writel((v), (addr))
250 #define iowrite32be(v, addr) __raw_writel(__cpu_to_be32(v), addr)
252 #define ioread8_rep(p, dst, count) \
253 insb((unsigned long) (p), (dst), (count))
254 #define ioread16_rep(p, dst, count) \
255 insw((unsigned long) (p), (dst), (count))
256 #define ioread32_rep(p, dst, count) \
257 insl((unsigned long) (p), (dst), (count))
259 #define iowrite8_rep(p, src, count) \
260 outsb((unsigned long) (p), (src), (count))
261 #define iowrite16_rep(p, src, count) \
262 outsw((unsigned long) (p), (src), (count))
263 #define iowrite32_rep(p, src, count) \
264 outsl((unsigned long) (p), (src), (count))
265 #endif /* CONFIG_GENERIC_IOMAP */
267 #ifndef IO_SPACE_LIMIT
268 #define IO_SPACE_LIMIT 0xffff
273 #include <linux/vmalloc.h>
274 #define __io_virt(x) ((void __force *) (x))
276 #ifndef CONFIG_GENERIC_IOMAP
278 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
281 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
285 #endif /* CONFIG_GENERIC_IOMAP */
288 * Change virtual addresses to physical addresses and vv.
289 * These are pretty trivial
292 static inline unsigned long virt_to_phys(volatile void *address)
294 return __pa((unsigned long)address);
297 static inline void *phys_to_virt(unsigned long address)
299 return __va(address);
304 * Change "struct page" to physical address.
306 * This implementation is for the no-MMU case only... if you have an MMU
307 * you'll need to provide your own definitions.
310 static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
312 return (void __iomem*) (unsigned long)offset;
315 #define __ioremap(offset, size, flags) ioremap(offset, size)
317 #ifndef ioremap_nocache
318 #define ioremap_nocache ioremap
322 #define ioremap_wc ioremap_nocache
325 static inline void iounmap(void __iomem *addr)
328 #endif /* CONFIG_MMU */
330 #ifdef CONFIG_HAS_IOPORT
331 #ifndef CONFIG_GENERIC_IOMAP
332 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
334 return (void __iomem *) port;
337 static inline void ioport_unmap(void __iomem *p)
340 #else /* CONFIG_GENERIC_IOMAP */
341 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
342 extern void ioport_unmap(void __iomem *p);
343 #endif /* CONFIG_GENERIC_IOMAP */
344 #endif /* CONFIG_HAS_IOPORT */
346 #ifndef xlate_dev_kmem_ptr
347 #define xlate_dev_kmem_ptr(p) p
349 #ifndef xlate_dev_mem_ptr
350 #define xlate_dev_mem_ptr(p) __va(p)
353 #ifdef CONFIG_VIRT_TO_BUS
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;
368 #define memset_io(a, b, c) memset(__io_virt(a), (b), (c))
371 #ifndef memcpy_fromio
372 #define memcpy_fromio(a, b, c) memcpy((a), __io_virt(b), (c))
375 #define memcpy_toio(a, b, c) memcpy(__io_virt(a), (b), (c))
378 #endif /* __KERNEL__ */
380 #endif /* __ASM_GENERIC_IO_H */