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 #define ARCH_HAS_IOREMAP_WT
22 #include <linux/types.h>
23 #include <asm/virtconvert.h>
24 #include <asm/string.h>
25 #include <asm/mb-regs.h>
26 #include <asm-generic/pci_iomap.h>
27 #include <linux/delay.h>
30 * swap functions are sometimes needed to interface little-endian hardware
33 static inline unsigned short _swapw(unsigned short v)
35 return ((v << 8) | (v >> 8));
38 static inline unsigned long _swapl(unsigned long v)
40 return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
43 //#define __iormb() asm volatile("membar")
44 //#define __iowmb() asm volatile("membar")
46 #define __raw_readb __builtin_read8
47 #define __raw_readw __builtin_read16
48 #define __raw_readl __builtin_read32
50 #define __raw_writeb(datum, addr) __builtin_write8(addr, datum)
51 #define __raw_writew(datum, addr) __builtin_write16(addr, datum)
52 #define __raw_writel(datum, addr) __builtin_write32(addr, datum)
54 static inline void io_outsb(unsigned int addr, const void *buf, int len)
56 unsigned long __ioaddr = (unsigned long) addr;
57 const uint8_t *bp = buf;
60 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
63 static inline void io_outsw(unsigned int addr, const void *buf, int len)
65 unsigned long __ioaddr = (unsigned long) addr;
66 const uint16_t *bp = buf;
69 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
72 extern void __outsl_ns(unsigned int addr, const void *buf, int len);
73 extern void __outsl_sw(unsigned int addr, const void *buf, int len);
74 static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
76 unsigned long __ioaddr = (unsigned long) addr;
79 __outsl_ns(__ioaddr, buf, len);
81 __outsl_sw(__ioaddr, buf, len);
84 static inline void io_insb(unsigned long addr, void *buf, int len)
89 *bp++ = __builtin_read8((volatile void __iomem *) addr);
92 static inline void io_insw(unsigned long addr, void *buf, int len)
97 *bp++ = __builtin_read16((volatile void __iomem *) addr);
100 extern void __insl_ns(unsigned long addr, void *buf, int len);
101 extern void __insl_sw(unsigned long addr, void *buf, int len);
102 static inline void __insl(unsigned long addr, void *buf, int len, int swap)
105 __insl_ns(addr, buf, len);
107 __insl_sw(addr, buf, len);
110 #define mmiowb() mb()
113 * make the short names macros so specific devices
114 * can override them as required
117 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
119 memset((void __force *) addr, val, count);
122 static inline void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
124 memcpy(dst, (void __force *) src, count);
127 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
129 memcpy((void __force *) dst, src, count);
132 static inline uint8_t inb(unsigned long addr)
134 return __builtin_read8((void __iomem *)addr);
137 static inline uint16_t inw(unsigned long addr)
139 uint16_t ret = __builtin_read16((void __iomem *)addr);
141 if (__is_PCI_IO(addr))
147 static inline uint32_t inl(unsigned long addr)
149 uint32_t ret = __builtin_read32((void __iomem *)addr);
151 if (__is_PCI_IO(addr))
157 static inline void outb(uint8_t datum, unsigned long addr)
159 __builtin_write8((void __iomem *)addr, datum);
162 static inline void outw(uint16_t datum, unsigned long addr)
164 if (__is_PCI_IO(addr))
165 datum = _swapw(datum);
166 __builtin_write16((void __iomem *)addr, datum);
169 static inline void outl(uint32_t datum, unsigned long addr)
171 if (__is_PCI_IO(addr))
172 datum = _swapl(datum);
173 __builtin_write32((void __iomem *)addr, datum);
176 #define inb_p(addr) inb(addr)
177 #define inw_p(addr) inw(addr)
178 #define inl_p(addr) inl(addr)
179 #define outb_p(x,addr) outb(x,addr)
180 #define outw_p(x,addr) outw(x,addr)
181 #define outl_p(x,addr) outl(x,addr)
183 #define outsb(a,b,l) io_outsb(a,b,l)
184 #define outsw(a,b,l) io_outsw(a,b,l)
185 #define outsl(a,b,l) __outsl(a,b,l,0)
187 #define insb(a,b,l) io_insb(a,b,l)
188 #define insw(a,b,l) io_insw(a,b,l)
189 #define insl(a,b,l) __insl(a,b,l,0)
191 #define IO_SPACE_LIMIT 0xffffffff
193 static inline uint8_t readb(const volatile void __iomem *addr)
195 return __builtin_read8((__force void volatile __iomem *) addr);
198 static inline uint16_t readw(const volatile void __iomem *addr)
200 uint16_t ret = __builtin_read16((__force void volatile __iomem *)addr);
202 if (__is_PCI_MEM(addr))
207 static inline uint32_t readl(const volatile void __iomem *addr)
209 uint32_t ret = __builtin_read32((__force void volatile __iomem *)addr);
211 if (__is_PCI_MEM(addr))
217 #define readb_relaxed readb
218 #define readw_relaxed readw
219 #define readl_relaxed readl
221 static inline void writeb(uint8_t datum, volatile void __iomem *addr)
223 __builtin_write8(addr, datum);
224 if (__is_PCI_MEM(addr))
225 __flush_PCI_writes();
228 static inline void writew(uint16_t datum, volatile void __iomem *addr)
230 if (__is_PCI_MEM(addr))
231 datum = _swapw(datum);
233 __builtin_write16(addr, datum);
234 if (__is_PCI_MEM(addr))
235 __flush_PCI_writes();
238 static inline void writel(uint32_t datum, volatile void __iomem *addr)
240 if (__is_PCI_MEM(addr))
241 datum = _swapl(datum);
243 __builtin_write32(addr, datum);
244 if (__is_PCI_MEM(addr))
245 __flush_PCI_writes();
248 #define writeb_relaxed writeb
249 #define writew_relaxed writew
250 #define writel_relaxed writel
252 /* Values for nocacheflag and cmode */
253 #define IOMAP_FULL_CACHING 0
254 #define IOMAP_NOCACHE_SER 1
255 #define IOMAP_NOCACHE_NONSER 2
256 #define IOMAP_WRITETHROUGH 3
258 extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
260 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
262 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
265 static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
267 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
270 static inline void __iomem *ioremap_wt(unsigned long physaddr, unsigned long size)
272 return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
275 static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
277 return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
280 #define ioremap_wc ioremap_nocache
281 #define ioremap_uc ioremap_nocache
283 extern void iounmap(void volatile __iomem *addr);
285 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
287 return (void __iomem *) port;
290 static inline void ioport_unmap(void __iomem *p)
294 static inline void flush_write_buffers(void)
296 __asm__ __volatile__ ("membar" : : :"memory");
300 * do appropriate I/O accesses for token type
302 static inline unsigned int ioread8(void __iomem *p)
304 return __builtin_read8(p);
307 static inline unsigned int ioread16(void __iomem *p)
309 uint16_t ret = __builtin_read16(p);
310 if (__is_PCI_addr(p))
315 static inline unsigned int ioread32(void __iomem *p)
317 uint32_t ret = __builtin_read32(p);
318 if (__is_PCI_addr(p))
323 static inline void iowrite8(u8 val, void __iomem *p)
325 __builtin_write8(p, val);
327 __flush_PCI_writes();
330 static inline void iowrite16(u16 val, void __iomem *p)
332 if (__is_PCI_addr(p))
334 __builtin_write16(p, val);
336 __flush_PCI_writes();
339 static inline void iowrite32(u32 val, void __iomem *p)
341 if (__is_PCI_addr(p))
343 __builtin_write32(p, val);
345 __flush_PCI_writes();
348 #define ioread16be(addr) be16_to_cpu(ioread16(addr))
349 #define ioread32be(addr) be32_to_cpu(ioread32(addr))
350 #define iowrite16be(v, addr) iowrite16(cpu_to_be16(v), (addr))
351 #define iowrite32be(v, addr) iowrite32(cpu_to_be32(v), (addr))
353 static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
355 io_insb((unsigned long) p, dst, count);
358 static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
360 io_insw((unsigned long) p, dst, count);
363 static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
365 __insl_ns((unsigned long) p, dst, count);
368 static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
370 io_outsb((unsigned long) p, src, count);
373 static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
375 io_outsw((unsigned long) p, src, count);
378 static inline void iowrite32_rep(void __iomem *p, const void *src, unsigned long count)
380 __outsl_ns((unsigned long) p, src, count);
383 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
385 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
391 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
394 #define xlate_dev_mem_ptr(p) __va(p)
397 * Convert a virtual cached pointer to an uncached pointer
399 #define xlate_dev_kmem_ptr(p) p
401 #endif /* __KERNEL__ */
403 #endif /* _ASM_IO_H */