2 * linux/include/asm-arm/io.h
4 * Copyright (C) 1996-2000 Russell King
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
11 * 16-Sep-1996 RMK Inlined the inx/outx functions & optimised for both
12 * constant addresses and variable addresses.
13 * 04-Dec-1997 RMK Moved a lot of this stuff to the new architecture
14 * specific IO header files.
15 * 27-Mar-1999 PJB Second parameter of memcpy_toio is const..
16 * 04-Apr-1999 PJB Added check_signature.
17 * 12-Dec-1999 RMK More cleanups
18 * 18-Jun-2000 RMK Removed virt_to_* and friends definitions
19 * 05-Oct-2004 BJD Moved memory string functions to use void __iomem
21 #ifndef __ASM_ARM_IO_H
22 #define __ASM_ARM_IO_H
26 #include <linux/types.h>
27 #include <asm/byteorder.h>
28 #include <asm/memory.h>
31 * ISA I/O bus memory addresses are 1:1 with the physical address.
33 #define isa_virt_to_bus virt_to_phys
34 #define isa_page_to_bus page_to_phys
35 #define isa_bus_to_virt phys_to_virt
38 * Generic IO read/write. These perform native-endian accesses. Note
39 * that some architectures will want to re-define __raw_{read,write}w.
41 extern void __raw_writesb(void __iomem *addr, const void *data, int bytelen);
42 extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen);
43 extern void __raw_writesl(void __iomem *addr, const void *data, int longlen);
45 extern void __raw_readsb(void __iomem *addr, void *data, int bytelen);
46 extern void __raw_readsw(void __iomem *addr, void *data, int wordlen);
47 extern void __raw_readsl(void __iomem *addr, void *data, int longlen);
49 #define __raw_writeb(v,a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a) = (v))
50 #define __raw_writew(v,a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a) = (v))
51 #define __raw_writel(v,a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a) = (v))
53 #define __raw_readb(a) (__chk_io_ptr(a), *(volatile unsigned char __force *)(a))
54 #define __raw_readw(a) (__chk_io_ptr(a), *(volatile unsigned short __force *)(a))
55 #define __raw_readl(a) (__chk_io_ptr(a), *(volatile unsigned int __force *)(a))
58 * Bad read/write accesses...
60 extern void __readwrite_bug(const char *fn);
63 * Now, pick up the machine-defined IO definitions
65 #include <asm/arch/io.h>
68 #warning machine class uses buggy __io_pci
70 #if defined(__arch_putb) || defined(__arch_putw) || defined(__arch_putl) || \
71 defined(__arch_getb) || defined(__arch_getw) || defined(__arch_getl)
72 #warning machine class uses old __arch_putw or __arch_getw
76 * IO port access primitives
77 * -------------------------
79 * The ARM doesn't have special IO access instructions; all IO is memory
80 * mapped. Note that these are defined to perform little endian accesses
81 * only. Their primary purpose is to access PCI and ISA peripherals.
83 * Note that for a big endian machine, this implies that the following
84 * big endian mode connectivity is in place, as described by numerous
87 * PCI: D0-D7 D8-D15 D16-D23 D24-D31
88 * ARM: D24-D31 D16-D23 D8-D15 D0-D7
90 * The machine specific io.h include defines __io to translate an "IO"
91 * address to a memory address.
93 * Note that we prevent GCC re-ordering or caching values in expressions
94 * by introducing sequence points into the in*() definitions. Note that
95 * __raw_* do not guarantee this behaviour.
97 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
100 #define outb(v,p) __raw_writeb(v,__io(p))
101 #define outw(v,p) __raw_writew((__force __u16) \
102 cpu_to_le16(v),__io(p))
103 #define outl(v,p) __raw_writel((__force __u32) \
104 cpu_to_le32(v),__io(p))
106 #define inb(p) ({ __u8 __v = __raw_readb(__io(p)); __v; })
107 #define inw(p) ({ __u16 __v = le16_to_cpu((__force __le16) \
108 __raw_readw(__io(p))); __v; })
109 #define inl(p) ({ __u32 __v = le32_to_cpu((__force __le32) \
110 __raw_readl(__io(p))); __v; })
112 #define outsb(p,d,l) __raw_writesb(__io(p),d,l)
113 #define outsw(p,d,l) __raw_writesw(__io(p),d,l)
114 #define outsl(p,d,l) __raw_writesl(__io(p),d,l)
116 #define insb(p,d,l) __raw_readsb(__io(p),d,l)
117 #define insw(p,d,l) __raw_readsw(__io(p),d,l)
118 #define insl(p,d,l) __raw_readsl(__io(p),d,l)
121 #define outb_p(val,port) outb((val),(port))
122 #define outw_p(val,port) outw((val),(port))
123 #define outl_p(val,port) outl((val),(port))
124 #define inb_p(port) inb((port))
125 #define inw_p(port) inw((port))
126 #define inl_p(port) inl((port))
128 #define outsb_p(port,from,len) outsb(port,from,len)
129 #define outsw_p(port,from,len) outsw(port,from,len)
130 #define outsl_p(port,from,len) outsl(port,from,len)
131 #define insb_p(port,to,len) insb(port,to,len)
132 #define insw_p(port,to,len) insw(port,to,len)
133 #define insl_p(port,to,len) insl(port,to,len)
136 * String version of IO memory access ops:
138 extern void _memcpy_fromio(void *, const volatile void __iomem *, size_t);
139 extern void _memcpy_toio(volatile void __iomem *, const void *, size_t);
140 extern void _memset_io(volatile void __iomem *, int, size_t);
145 * Memory access primitives
146 * ------------------------
148 * These perform PCI memory accesses via an ioremap region. They don't
149 * take an address as such, but a cookie.
151 * Again, this are defined to perform little endian accesses. See the
152 * IO port primitives for more information.
155 #define readb(c) ({ __u8 __v = __raw_readb(__mem_pci(c)); __v; })
156 #define readw(c) ({ __u16 __v = le16_to_cpu((__force __le16) \
157 __raw_readw(__mem_pci(c))); __v; })
158 #define readl(c) ({ __u32 __v = le32_to_cpu((__force __le32) \
159 __raw_readl(__mem_pci(c))); __v; })
160 #define readb_relaxed(addr) readb(addr)
161 #define readw_relaxed(addr) readw(addr)
162 #define readl_relaxed(addr) readl(addr)
164 #define readsb(p,d,l) __raw_readsb(__mem_pci(p),d,l)
165 #define readsw(p,d,l) __raw_readsw(__mem_pci(p),d,l)
166 #define readsl(p,d,l) __raw_readsl(__mem_pci(p),d,l)
168 #define writeb(v,c) __raw_writeb(v,__mem_pci(c))
169 #define writew(v,c) __raw_writew((__force __u16) \
170 cpu_to_le16(v),__mem_pci(c))
171 #define writel(v,c) __raw_writel((__force __u32) \
172 cpu_to_le32(v),__mem_pci(c))
174 #define writesb(p,d,l) __raw_writesb(__mem_pci(p),d,l)
175 #define writesw(p,d,l) __raw_writesw(__mem_pci(p),d,l)
176 #define writesl(p,d,l) __raw_writesl(__mem_pci(p),d,l)
178 #define memset_io(c,v,l) _memset_io(__mem_pci(c),(v),(l))
179 #define memcpy_fromio(a,c,l) _memcpy_fromio((a),__mem_pci(c),(l))
180 #define memcpy_toio(c,a,l) _memcpy_toio(__mem_pci(c),(a),(l))
182 #define eth_io_copy_and_sum(s,c,l,b) \
183 eth_copy_and_sum((s),__mem_pci(c),(l),(b))
186 check_signature(void __iomem *io_addr, const unsigned char *signature,
191 if (readb(io_addr) != *signature)
202 #elif !defined(readb)
204 #define readb(c) (__readwrite_bug("readb"),0)
205 #define readw(c) (__readwrite_bug("readw"),0)
206 #define readl(c) (__readwrite_bug("readl"),0)
207 #define writeb(v,c) __readwrite_bug("writeb")
208 #define writew(v,c) __readwrite_bug("writew")
209 #define writel(v,c) __readwrite_bug("writel")
211 #define eth_io_copy_and_sum(s,c,l,b) __readwrite_bug("eth_io_copy_and_sum")
213 #define check_signature(io,sig,len) (0)
215 #endif /* __mem_pci */
218 * If this architecture has ISA IO, then define the isa_read/isa_write
223 #define isa_readb(addr) __raw_readb(__mem_isa(addr))
224 #define isa_readw(addr) __raw_readw(__mem_isa(addr))
225 #define isa_readl(addr) __raw_readl(__mem_isa(addr))
226 #define isa_writeb(val,addr) __raw_writeb(val,__mem_isa(addr))
227 #define isa_writew(val,addr) __raw_writew(val,__mem_isa(addr))
228 #define isa_writel(val,addr) __raw_writel(val,__mem_isa(addr))
229 #define isa_memset_io(a,b,c) _memset_io(__mem_isa(a),(b),(c))
230 #define isa_memcpy_fromio(a,b,c) _memcpy_fromio((a),__mem_isa(b),(c))
231 #define isa_memcpy_toio(a,b,c) _memcpy_toio(__mem_isa((a)),(b),(c))
233 #define isa_eth_io_copy_and_sum(a,b,c,d) \
234 eth_copy_and_sum((a),__mem_isa(b),(c),(d))
236 #else /* __mem_isa */
238 #define isa_readb(addr) (__readwrite_bug("isa_readb"),0)
239 #define isa_readw(addr) (__readwrite_bug("isa_readw"),0)
240 #define isa_readl(addr) (__readwrite_bug("isa_readl"),0)
241 #define isa_writeb(val,addr) __readwrite_bug("isa_writeb")
242 #define isa_writew(val,addr) __readwrite_bug("isa_writew")
243 #define isa_writel(val,addr) __readwrite_bug("isa_writel")
244 #define isa_memset_io(a,b,c) __readwrite_bug("isa_memset_io")
245 #define isa_memcpy_fromio(a,b,c) __readwrite_bug("isa_memcpy_fromio")
246 #define isa_memcpy_toio(a,b,c) __readwrite_bug("isa_memcpy_toio")
248 #define isa_eth_io_copy_and_sum(a,b,c,d) \
249 __readwrite_bug("isa_eth_io_copy_and_sum")
251 #endif /* __mem_isa */
254 * ioremap and friends.
256 * ioremap takes a PCI memory address, as specified in
257 * Documentation/IO-mapping.txt.
259 extern void __iomem * __ioremap(unsigned long, size_t, unsigned long, unsigned long);
260 extern void __iounmap(void __iomem *addr);
262 #ifndef __arch_ioremap
263 #define ioremap(cookie,size) __ioremap(cookie,size,0,1)
264 #define ioremap_nocache(cookie,size) __ioremap(cookie,size,0,1)
265 #define ioremap_cached(cookie,size) __ioremap(cookie,size,L_PTE_CACHEABLE,1)
266 #define iounmap(cookie) __iounmap(cookie)
268 #define ioremap(cookie,size) __arch_ioremap((cookie),(size),0,1)
269 #define ioremap_nocache(cookie,size) __arch_ioremap((cookie),(size),0,1)
270 #define ioremap_cached(cookie,size) __arch_ioremap((cookie),(size),L_PTE_CACHEABLE,1)
271 #define iounmap(cookie) __arch_iounmap(cookie)
275 * io{read,write}{8,16,32} macros
278 #define ioread8(p) ({ unsigned int __v = __raw_readb(p); __v; })
279 #define ioread16(p) ({ unsigned int __v = le16_to_cpu(__raw_readw(p)); __v; })
280 #define ioread32(p) ({ unsigned int __v = le32_to_cpu(__raw_readl(p)); __v; })
282 #define iowrite8(v,p) __raw_writeb(v, p)
283 #define iowrite16(v,p) __raw_writew(cpu_to_le16(v), p)
284 #define iowrite32(v,p) __raw_writel(cpu_to_le32(v), p)
286 #define ioread8_rep(p,d,c) __raw_readsb(p,d,c)
287 #define ioread16_rep(p,d,c) __raw_readsw(p,d,c)
288 #define ioread32_rep(p,d,c) __raw_readsl(p,d,c)
290 #define iowrite8_rep(p,s,c) __raw_writesb(p,s,c)
291 #define iowrite16_rep(p,s,c) __raw_writesw(p,s,c)
292 #define iowrite32_rep(p,s,c) __raw_writesl(p,s,c)
294 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
295 extern void ioport_unmap(void __iomem *addr);
300 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen);
301 extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
304 * can the hardware map this into one segment or not, given no other
307 #define BIOVEC_MERGEABLE(vec1, vec2) \
308 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
311 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
314 #define xlate_dev_mem_ptr(p) __va(p)
317 * Convert a virtual cached pointer to an uncached pointer
319 #define xlate_dev_kmem_ptr(p) p
321 #endif /* __KERNEL__ */
322 #endif /* __ASM_ARM_IO_H */