1 /*
2 * arch/arm/include/asm/io.h
3 *
4 * Copyright (C) 1996-2000 Russell King
5 *
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.
9 *
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
20 */
21 #ifndef __ASM_ARM_IO_H
22 #define __ASM_ARM_IO_H
23
24 #ifdef __KERNEL__
25
26 #include <linux/types.h>
27 #include <asm/byteorder.h>
28 #include <asm/memory.h>
29
30 /*
31 * ISA I/O bus memory addresses are 1:1 with the physical address.
32 */
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
36
37 /*
38 * Generic IO read/write. These perform native-endian accesses. Note
39 * that some architectures will want to re-define __raw_{read,write}w.
40 */
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);
44
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);
48
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))
52
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))
56
57 /*
58 * Architecture ioremap implementation.
59 */
60 #define MT_DEVICE 0
61 #define MT_DEVICE_NONSHARED 1
62 #define MT_DEVICE_CACHED 2
63 #define MT_DEVICE_WC 3
64 /*
65 * types 4 onwards can be found in asm/mach/map.h and are undefined
66 * for ioremap
67 */
68
69 /*
70 * __arm_ioremap takes CPU physical address.
71 * __arm_ioremap_pfn takes a Page Frame Number and an offset into that page
72 */
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);
76
77 /*
78 * Bad read/write accesses...
79 */
80 extern void __readwrite_bug(const char *fn);
81
82 /*
83 * A typesafe __io() helper
84 */
__typesafe_io(unsigned long addr)85 static inline void __iomem *__typesafe_io(unsigned long addr)
86 {
87 return (void __iomem *)addr;
88 }
89
90 /*
91 * Now, pick up the machine-defined IO definitions
92 */
93 #include <mach/io.h>
94
95 /*
96 * IO port access primitives
97 * -------------------------
98 *
99 * The ARM doesn't have special IO access instructions; all IO is memory
100 * mapped. Note that these are defined to perform little endian accesses
101 * only. Their primary purpose is to access PCI and ISA peripherals.
102 *
103 * Note that for a big endian machine, this implies that the following
104 * big endian mode connectivity is in place, as described by numerous
105 * ARM documents:
106 *
107 * PCI: D0-D7 D8-D15 D16-D23 D24-D31
108 * ARM: D24-D31 D16-D23 D8-D15 D0-D7
109 *
110 * The machine specific io.h include defines __io to translate an "IO"
111 * address to a memory address.
112 *
113 * Note that we prevent GCC re-ordering or caching values in expressions
114 * by introducing sequence points into the in*() definitions. Note that
115 * __raw_* do not guarantee this behaviour.
116 *
117 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
118 */
119 #ifdef __io
120 #define outb(v,p) __raw_writeb(v,__io(p))
121 #define outw(v,p) __raw_writew((__force __u16) \
122 cpu_to_le16(v),__io(p))
123 #define outl(v,p) __raw_writel((__force __u32) \
124 cpu_to_le32(v),__io(p))
125
126 #define inb(p) ({ __u8 __v = __raw_readb(__io(p)); __v; })
127 #define inw(p) ({ __u16 __v = le16_to_cpu((__force __le16) \
128 __raw_readw(__io(p))); __v; })
129 #define inl(p) ({ __u32 __v = le32_to_cpu((__force __le32) \
130 __raw_readl(__io(p))); __v; })
131
132 #define outsb(p,d,l) __raw_writesb(__io(p),d,l)
133 #define outsw(p,d,l) __raw_writesw(__io(p),d,l)
134 #define outsl(p,d,l) __raw_writesl(__io(p),d,l)
135
136 #define insb(p,d,l) __raw_readsb(__io(p),d,l)
137 #define insw(p,d,l) __raw_readsw(__io(p),d,l)
138 #define insl(p,d,l) __raw_readsl(__io(p),d,l)
139 #endif
140
141 #define outb_p(val,port) outb((val),(port))
142 #define outw_p(val,port) outw((val),(port))
143 #define outl_p(val,port) outl((val),(port))
144 #define inb_p(port) inb((port))
145 #define inw_p(port) inw((port))
146 #define inl_p(port) inl((port))
147
148 #define outsb_p(port,from,len) outsb(port,from,len)
149 #define outsw_p(port,from,len) outsw(port,from,len)
150 #define outsl_p(port,from,len) outsl(port,from,len)
151 #define insb_p(port,to,len) insb(port,to,len)
152 #define insw_p(port,to,len) insw(port,to,len)
153 #define insl_p(port,to,len) insl(port,to,len)
154
155 /*
156 * String version of IO memory access ops:
157 */
158 extern void _memcpy_fromio(void *, const volatile void __iomem *, size_t);
159 extern void _memcpy_toio(volatile void __iomem *, const void *, size_t);
160 extern void _memset_io(volatile void __iomem *, int, size_t);
161
162 #define mmiowb()
163
164 /*
165 * Memory access primitives
166 * ------------------------
167 *
168 * These perform PCI memory accesses via an ioremap region. They don't
169 * take an address as such, but a cookie.
170 *
171 * Again, this are defined to perform little endian accesses. See the
172 * IO port primitives for more information.
173 */
174 #ifdef __mem_pci
175 #define readb(c) ({ __u8 __v = __raw_readb(__mem_pci(c)); __v; })
176 #define readw(c) ({ __u16 __v = le16_to_cpu((__force __le16) \
177 __raw_readw(__mem_pci(c))); __v; })
178 #define readl(c) ({ __u32 __v = le32_to_cpu((__force __le32) \
179 __raw_readl(__mem_pci(c))); __v; })
180 #define readb_relaxed(addr) readb(addr)
181 #define readw_relaxed(addr) readw(addr)
182 #define readl_relaxed(addr) readl(addr)
183
184 #define readsb(p,d,l) __raw_readsb(__mem_pci(p),d,l)
185 #define readsw(p,d,l) __raw_readsw(__mem_pci(p),d,l)
186 #define readsl(p,d,l) __raw_readsl(__mem_pci(p),d,l)
187
188 #define writeb(v,c) __raw_writeb(v,__mem_pci(c))
189 #define writew(v,c) __raw_writew((__force __u16) \
190 cpu_to_le16(v),__mem_pci(c))
191 #define writel(v,c) __raw_writel((__force __u32) \
192 cpu_to_le32(v),__mem_pci(c))
193
194 #define writesb(p,d,l) __raw_writesb(__mem_pci(p),d,l)
195 #define writesw(p,d,l) __raw_writesw(__mem_pci(p),d,l)
196 #define writesl(p,d,l) __raw_writesl(__mem_pci(p),d,l)
197
198 #define memset_io(c,v,l) _memset_io(__mem_pci(c),(v),(l))
199 #define memcpy_fromio(a,c,l) _memcpy_fromio((a),__mem_pci(c),(l))
200 #define memcpy_toio(c,a,l) _memcpy_toio(__mem_pci(c),(a),(l))
201
202 #elif !defined(readb)
203
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")
210
211 #define check_signature(io,sig,len) (0)
212
213 #endif /* __mem_pci */
214
215 /*
216 * ioremap and friends.
217 *
218 * ioremap takes a PCI memory address, as specified in
219 * Documentation/IO-mapping.txt.
220 *
221 */
222 #ifndef __arch_ioremap
223 #define ioremap(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
224 #define ioremap_nocache(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE)
225 #define ioremap_cached(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE_CACHED)
226 #define ioremap_wc(cookie,size) __arm_ioremap(cookie, size, MT_DEVICE_WC)
227 #define iounmap(cookie) __iounmap(cookie)
228 #else
229 #define ioremap(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE)
230 #define ioremap_nocache(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE)
231 #define ioremap_cached(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE_CACHED)
232 #define ioremap_wc(cookie,size) __arch_ioremap((cookie), (size), MT_DEVICE_WC)
233 #define iounmap(cookie) __arch_iounmap(cookie)
234 #endif
235
236 /*
237 * io{read,write}{8,16,32} macros
238 */
239 #ifndef ioread8
240 #define ioread8(p) ({ unsigned int __v = __raw_readb(p); __v; })
241 #define ioread16(p) ({ unsigned int __v = le16_to_cpu((__force __le16)__raw_readw(p)); __v; })
242 #define ioread32(p) ({ unsigned int __v = le32_to_cpu((__force __le32)__raw_readl(p)); __v; })
243
244 #define iowrite8(v,p) __raw_writeb(v, p)
245 #define iowrite16(v,p) __raw_writew((__force __u16)cpu_to_le16(v), p)
246 #define iowrite32(v,p) __raw_writel((__force __u32)cpu_to_le32(v), p)
247
248 #define ioread8_rep(p,d,c) __raw_readsb(p,d,c)
249 #define ioread16_rep(p,d,c) __raw_readsw(p,d,c)
250 #define ioread32_rep(p,d,c) __raw_readsl(p,d,c)
251
252 #define iowrite8_rep(p,s,c) __raw_writesb(p,s,c)
253 #define iowrite16_rep(p,s,c) __raw_writesw(p,s,c)
254 #define iowrite32_rep(p,s,c) __raw_writesl(p,s,c)
255
256 extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
257 extern void ioport_unmap(void __iomem *addr);
258 #endif
259
260 struct pci_dev;
261
262 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen);
263 extern void pci_iounmap(struct pci_dev *dev, void __iomem *addr);
264
265 /*
266 * can the hardware map this into one segment or not, given no other
267 * constraints.
268 */
269 #define BIOVEC_MERGEABLE(vec1, vec2) \
270 ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
271
272 #ifdef CONFIG_MMU
273 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
274 extern int valid_phys_addr_range(unsigned long addr, size_t size);
275 extern int valid_mmap_phys_addr_range(unsigned long pfn, size_t size);
276 #endif
277
278 /*
279 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
280 * access
281 */
282 #define xlate_dev_mem_ptr(p) __va(p)
283
284 /*
285 * Convert a virtual cached pointer to an uncached pointer
286 */
287 #define xlate_dev_kmem_ptr(p) p
288
289 /*
290 * Register ISA memory and port locations for glibc iopl/inb/outb
291 * emulation.
292 */
293 extern void register_isa_ports(unsigned int mmio, unsigned int io,
294 unsigned int io_shift);
295
296 #endif /* __KERNEL__ */
297 #endif /* __ASM_ARM_IO_H */
298