fs: use kmem_cache_zalloc instead
[pv_ops_mirror.git] / include / asm-arm / io.h
blobeebe56e74d6d9f4ca922ebf7c1ad667a2c66d879
1 /*
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.
10 * Modifications:
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
24 #ifdef __KERNEL__
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(const void __iomem *addr, void *data, int bytelen);
46 extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
47 extern void __raw_readsl(const 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 * Architecture ioremap implementation.
60 #define MT_DEVICE 0
61 #define MT_DEVICE_NONSHARED 1
62 #define MT_DEVICE_CACHED 2
63 #define MT_DEVICE_IXP2000 3
65 * types 4 onwards can be found in asm/mach/map.h and are undefined
66 * for ioremap
70 * __arm_ioremap takes CPU physical address.
71 * __arm_ioremap_pfn takes a Page Frame Number and an offset into that page
73 extern void __iomem * __arm_ioremap_pfn(unsigned long, unsigned long, size_t, unsigned int);
74 extern void __iomem * __arm_ioremap(unsigned long, size_t, unsigned int);
75 extern void __iounmap(volatile void __iomem *addr);
78 * Bad read/write accesses...
80 extern void __readwrite_bug(const char *fn);
83 * Now, pick up the machine-defined IO definitions
85 #include <asm/arch/io.h>
88 * IO port access primitives
89 * -------------------------
91 * The ARM doesn't have special IO access instructions; all IO is memory
92 * mapped. Note that these are defined to perform little endian accesses
93 * only. Their primary purpose is to access PCI and ISA peripherals.
95 * Note that for a big endian machine, this implies that the following
96 * big endian mode connectivity is in place, as described by numerous
97 * ARM documents:
99 * PCI: D0-D7 D8-D15 D16-D23 D24-D31
100 * ARM: D24-D31 D16-D23 D8-D15 D0-D7
102 * The machine specific io.h include defines __io to translate an "IO"
103 * address to a memory address.
105 * Note that we prevent GCC re-ordering or caching values in expressions
106 * by introducing sequence points into the in*() definitions. Note that
107 * __raw_* do not guarantee this behaviour.
109 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
111 #ifdef __io
112 #define outb(v,p) __raw_writeb(v,__io(p))
113 #define outw(v,p) __raw_writew((__force __u16) \
114 cpu_to_le16(v),__io(p))
115 #define outl(v,p) __raw_writel((__force __u32) \
116 cpu_to_le32(v),__io(p))
118 #define inb(p) ({ __u8 __v = __raw_readb(__io(p)); __v; })
119 #define inw(p) ({ __u16 __v = le16_to_cpu((__force __le16) \
120 __raw_readw(__io(p))); __v; })
121 #define inl(p) ({ __u32 __v = le32_to_cpu((__force __le32) \
122 __raw_readl(__io(p))); __v; })
124 #define outsb(p,d,l) __raw_writesb(__io(p),d,l)
125 #define outsw(p,d,l) __raw_writesw(__io(p),d,l)
126 #define outsl(p,d,l) __raw_writesl(__io(p),d,l)
128 #define insb(p,d,l) __raw_readsb(__io(p),d,l)
129 #define insw(p,d,l) __raw_readsw(__io(p),d,l)
130 #define insl(p,d,l) __raw_readsl(__io(p),d,l)
131 #endif
133 #define outb_p(val,port) outb((val),(port))
134 #define outw_p(val,port) outw((val),(port))
135 #define outl_p(val,port) outl((val),(port))
136 #define inb_p(port) inb((port))
137 #define inw_p(port) inw((port))
138 #define inl_p(port) inl((port))
140 #define outsb_p(port,from,len) outsb(port,from,len)
141 #define outsw_p(port,from,len) outsw(port,from,len)
142 #define outsl_p(port,from,len) outsl(port,from,len)
143 #define insb_p(port,to,len) insb(port,to,len)
144 #define insw_p(port,to,len) insw(port,to,len)
145 #define insl_p(port,to,len) insl(port,to,len)
148 * String version of IO memory access ops:
150 extern void _memcpy_fromio(void *, const volatile void __iomem *, size_t);
151 extern void _memcpy_toio(volatile void __iomem *, const void *, size_t);
152 extern void _memset_io(volatile void __iomem *, int, size_t);
154 #define mmiowb()
157 * Memory access primitives
158 * ------------------------
160 * These perform PCI memory accesses via an ioremap region. They don't
161 * take an address as such, but a cookie.
163 * Again, this are defined to perform little endian accesses. See the
164 * IO port primitives for more information.
166 #ifdef __mem_pci
167 #define readb(c) ({ __u8 __v = __raw_readb(__mem_pci(c)); __v; })
168 #define readw(c) ({ __u16 __v = le16_to_cpu((__force __le16) \
169 __raw_readw(__mem_pci(c))); __v; })
170 #define readl(c) ({ __u32 __v = le32_to_cpu((__force __le32) \
171 __raw_readl(__mem_pci(c))); __v; })
172 #define readb_relaxed(addr) readb(addr)
173 #define readw_relaxed(addr) readw(addr)
174 #define readl_relaxed(addr) readl(addr)
176 #define readsb(p,d,l) __raw_readsb(__mem_pci(p),d,l)
177 #define readsw(p,d,l) __raw_readsw(__mem_pci(p),d,l)
178 #define readsl(p,d,l) __raw_readsl(__mem_pci(p),d,l)
180 #define writeb(v,c) __raw_writeb(v,__mem_pci(c))
181 #define writew(v,c) __raw_writew((__force __u16) \
182 cpu_to_le16(v),__mem_pci(c))
183 #define writel(v,c) __raw_writel((__force __u32) \
184 cpu_to_le32(v),__mem_pci(c))
186 #define writesb(p,d,l) __raw_writesb(__mem_pci(p),d,l)
187 #define writesw(p,d,l) __raw_writesw(__mem_pci(p),d,l)
188 #define writesl(p,d,l) __raw_writesl(__mem_pci(p),d,l)
190 #define memset_io(c,v,l) _memset_io(__mem_pci(c),(v),(l))
191 #define memcpy_fromio(a,c,l) _memcpy_fromio((a),__mem_pci(c),(l))
192 #define memcpy_toio(c,a,l) _memcpy_toio(__mem_pci(c),(a),(l))
194 #elif !defined(readb)
196 #define readb(c) (__readwrite_bug("readb"),0)
197 #define readw(c) (__readwrite_bug("readw"),0)
198 #define readl(c) (__readwrite_bug("readl"),0)
199 #define writeb(v,c) __readwrite_bug("writeb")
200 #define writew(v,c) __readwrite_bug("writew")
201 #define writel(v,c) __readwrite_bug("writel")
203 #define check_signature(io,sig,len) (0)
205 #endif /* __mem_pci */
208 * ioremap and friends.
210 * ioremap takes a PCI memory address, as specified in
211 * Documentation/IO-mapping.txt.
214 #ifndef __arch_ioremap
215 #define ioremap(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
216 #define ioremap_nocache(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
217 #define ioremap_cached(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE_CACHED)
218 #define iounmap(cookie) __iounmap(cookie)
219 #else
220 #define ioremap(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE)
221 #define ioremap_nocache(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE)
222 #define ioremap_cached(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE_CACHED)
223 #define iounmap(cookie) __arch_iounmap(cookie)
224 #endif
227 * io{read,write}{8,16,32} macros
229 #ifndef ioread8
230 #define ioread8(p) ({ unsigned int __v = __raw_readb(p); __v; })
231 #define ioread16(p) ({ unsigned int __v = le16_to_cpu((__force __le16)__raw_readw(p)); __v; })
232 #define ioread32(p) ({ unsigned int __v = le32_to_cpu((__force __le32)__raw_readl(p)); __v; })
234 #define iowrite8(v,p) __raw_writeb(v, p)
235 #define iowrite16(v,p) __raw_writew((__force __u16)cpu_to_le16(v), p)
236 #define iowrite32(v,p) __raw_writel((__force __u32)cpu_to_le32(v), p)
238 #define ioread8_rep(p,d,c) __raw_readsb(p,d,c)
239 #define ioread16_rep(p,d,c) __raw_readsw(p,d,c)
240 #define ioread32_rep(p,d,c) __raw_readsl(p,d,c)
242 #define iowrite8_rep(p,s,c) __raw_writesb(p,s,c)
243 #define iowrite16_rep(p,s,c) __raw_writesw(p,s,c)
244 #define iowrite32_rep(p,s,c) __raw_writesl(p,s,c)
246 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
247 extern void ioport_unmap(void __iomem *addr);
248 #endif
250 struct pci_dev;
252 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen);
253 extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
256 * can the hardware map this into one segment or not, given no other
257 * constraints.
259 #define BIOVEC_MERGEABLE(vec1, vec2) \
260 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
262 #ifdef CONFIG_MMU
263 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
264 extern int valid_phys_addr_range(unsigned long addr, size_t size);
265 extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
266 #endif
269 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
270 * access
272 #define xlate_dev_mem_ptr(p) __va(p)
275 * Convert a virtual cached pointer to an uncached pointer
277 #define xlate_dev_kmem_ptr(p) p
280 * Register ISA memory and port locations for glibc iopl/inb/outb
281 * emulation.
283 extern void register_isa_ports(unsigned int mmio, unsigned int io,
284 unsigned int io_shift);
286 #endif /* __KERNEL__ */
287 #endif /* __ASM_ARM_IO_H */