1 /* io.h: FRV I/O operations
3 * Copyright (C) 2004 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 License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
11 * This gets interesting when talking to the PCI bus - the CPU is in big endian
12 * mode, the PCI bus is little endian and the hardware in the middle can do
20 #include <linux/config.h>
21 #include <asm/virtconvert.h>
22 #include <asm/string.h>
23 #include <asm/mb-regs.h>
24 #include <linux/delay.h>
27 * swap functions are sometimes needed to interface little-endian hardware
30 static inline unsigned short _swapw(unsigned short v)
32 return ((v << 8) | (v >> 8));
35 static inline unsigned long _swapl(unsigned long v)
37 return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
40 //#define __iormb() asm volatile("membar")
41 //#define __iowmb() asm volatile("membar")
43 #define __raw_readb(addr) __builtin_read8((void *) (addr))
44 #define __raw_readw(addr) __builtin_read16((void *) (addr))
45 #define __raw_readl(addr) __builtin_read32((void *) (addr))
47 #define __raw_writeb(datum, addr) __builtin_write8((void *) (addr), datum)
48 #define __raw_writew(datum, addr) __builtin_write16((void *) (addr), datum)
49 #define __raw_writel(datum, addr) __builtin_write32((void *) (addr), datum)
51 static inline void io_outsb(unsigned int addr, const void *buf, int len)
53 unsigned long __ioaddr = (unsigned long) addr;
54 const uint8_t *bp = buf;
57 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
60 static inline void io_outsw(unsigned int addr, const void *buf, int len)
62 unsigned long __ioaddr = (unsigned long) addr;
63 const uint16_t *bp = buf;
66 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
69 extern void __outsl_ns(unsigned int addr, const void *buf, int len);
70 extern void __outsl_sw(unsigned int addr, const void *buf, int len);
71 static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
73 unsigned long __ioaddr = (unsigned long) addr;
76 __outsl_ns(__ioaddr, buf, len);
78 __outsl_sw(__ioaddr, buf, len);
81 static inline void io_insb(unsigned long addr, void *buf, int len)
86 *bp++ = __builtin_read8((volatile void __iomem *) addr);
89 static inline void io_insw(unsigned long addr, void *buf, int len)
94 *bp++ = __builtin_read16((volatile void __iomem *) addr);
97 extern void __insl_ns(unsigned long addr, void *buf, int len);
98 extern void __insl_sw(unsigned long addr, void *buf, int len);
99 static inline void __insl(unsigned long addr, void *buf, int len, int swap)
102 __insl_ns(addr, buf, len);
104 __insl_sw(addr, buf, len);
108 * make the short names macros so specific devices
109 * can override them as required
112 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
114 memset((void __force *) addr, val, count);
117 static inline void memcpy_fromio(void *dst, volatile void __iomem *src, int count)
119 memcpy(dst, (void __force *) src, count);
122 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
124 memcpy((void __force *) dst, src, count);
127 static inline uint8_t inb(unsigned long addr)
129 return __builtin_read8((void *)addr);
132 static inline uint16_t inw(unsigned long addr)
134 uint16_t ret = __builtin_read16((void *)addr);
136 if (__is_PCI_IO(addr))
142 static inline uint32_t inl(unsigned long addr)
144 uint32_t ret = __builtin_read32((void *)addr);
146 if (__is_PCI_IO(addr))
152 static inline void outb(uint8_t datum, unsigned long addr)
154 __builtin_write8((void *)addr, datum);
157 static inline void outw(uint16_t datum, unsigned long addr)
159 if (__is_PCI_IO(addr))
160 datum = _swapw(datum);
161 __builtin_write16((void *)addr, datum);
164 static inline void outl(uint32_t datum, unsigned long addr)
166 if (__is_PCI_IO(addr))
167 datum = _swapl(datum);
168 __builtin_write32((void *)addr, datum);
171 #define inb_p(addr) inb(addr)
172 #define inw_p(addr) inw(addr)
173 #define inl_p(addr) inl(addr)
174 #define outb_p(x,addr) outb(x,addr)
175 #define outw_p(x,addr) outw(x,addr)
176 #define outl_p(x,addr) outl(x,addr)
178 #define outsb(a,b,l) io_outsb(a,b,l)
179 #define outsw(a,b,l) io_outsw(a,b,l)
180 #define outsl(a,b,l) __outsl(a,b,l,0)
182 #define insb(a,b,l) io_insb(a,b,l)
183 #define insw(a,b,l) io_insw(a,b,l)
184 #define insl(a,b,l) __insl(a,b,l,0)
186 #define IO_SPACE_LIMIT 0xffffffff
188 static inline uint8_t readb(const volatile void __iomem *addr)
190 return __builtin_read8((volatile uint8_t __force *) addr);
193 static inline uint16_t readw(const volatile void __iomem *addr)
195 uint16_t ret = __builtin_read16((volatile uint16_t __force *)addr);
197 if (__is_PCI_MEM(addr))
202 static inline uint32_t readl(const volatile void __iomem *addr)
204 uint32_t ret = __builtin_read32((volatile uint32_t __force *)addr);
206 if (__is_PCI_MEM(addr))
212 static inline void writeb(uint8_t datum, volatile void __iomem *addr)
214 __builtin_write8((volatile uint8_t __force *) addr, datum);
215 if (__is_PCI_MEM(addr))
216 __flush_PCI_writes();
219 static inline void writew(uint16_t datum, volatile void __iomem *addr)
221 if (__is_PCI_MEM(addr))
222 datum = _swapw(datum);
224 __builtin_write16((volatile uint16_t __force *) addr, datum);
225 if (__is_PCI_MEM(addr))
226 __flush_PCI_writes();
229 static inline void writel(uint32_t datum, volatile void __iomem *addr)
231 if (__is_PCI_MEM(addr))
232 datum = _swapl(datum);
234 __builtin_write32((volatile uint32_t __force *) addr, datum);
235 if (__is_PCI_MEM(addr))
236 __flush_PCI_writes();
240 /* Values for nocacheflag and cmode */
241 #define IOMAP_FULL_CACHING 0
242 #define IOMAP_NOCACHE_SER 1
243 #define IOMAP_NOCACHE_NONSER 2
244 #define IOMAP_WRITETHROUGH 3
246 extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
247 extern void __iounmap(void __iomem *addr, unsigned long size);
249 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
251 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
254 static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
256 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
259 static inline void __iomem *ioremap_writethrough(unsigned long physaddr, unsigned long size)
261 return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
264 static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
266 return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
269 extern void iounmap(void __iomem *addr);
271 static inline void flush_write_buffers(void)
273 __asm__ __volatile__ ("membar" : : :"memory");
278 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
281 #define xlate_dev_mem_ptr(p) __va(p)
284 * Convert a virtual cached pointer to an uncached pointer
286 #define xlate_dev_kmem_ptr(p) p
288 #endif /* __KERNEL__ */
290 #endif /* _ASM_IO_H */