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 <linux/types.h>
22 #include <asm/virtconvert.h>
23 #include <asm/string.h>
24 #include <asm/mb-regs.h>
25 #include <linux/delay.h>
28 * swap functions are sometimes needed to interface little-endian hardware
31 static inline unsigned short _swapw(unsigned short v)
33 return ((v << 8) | (v >> 8));
36 static inline unsigned long _swapl(unsigned long v)
38 return ((v << 24) | ((v & 0xff00) << 8) | ((v & 0xff0000) >> 8) | (v >> 24));
41 //#define __iormb() asm volatile("membar")
42 //#define __iowmb() asm volatile("membar")
44 #define __raw_readb(addr) __builtin_read8((void *) (addr))
45 #define __raw_readw(addr) __builtin_read16((void *) (addr))
46 #define __raw_readl(addr) __builtin_read32((void *) (addr))
48 #define __raw_writeb(datum, addr) __builtin_write8((void *) (addr), datum)
49 #define __raw_writew(datum, addr) __builtin_write16((void *) (addr), datum)
50 #define __raw_writel(datum, addr) __builtin_write32((void *) (addr), datum)
52 static inline void io_outsb(unsigned int addr, const void *buf, int len)
54 unsigned long __ioaddr = (unsigned long) addr;
55 const uint8_t *bp = buf;
58 __builtin_write8((volatile void __iomem *) __ioaddr, *bp++);
61 static inline void io_outsw(unsigned int addr, const void *buf, int len)
63 unsigned long __ioaddr = (unsigned long) addr;
64 const uint16_t *bp = buf;
67 __builtin_write16((volatile void __iomem *) __ioaddr, (*bp++));
70 extern void __outsl_ns(unsigned int addr, const void *buf, int len);
71 extern void __outsl_sw(unsigned int addr, const void *buf, int len);
72 static inline void __outsl(unsigned int addr, const void *buf, int len, int swap)
74 unsigned long __ioaddr = (unsigned long) addr;
77 __outsl_ns(__ioaddr, buf, len);
79 __outsl_sw(__ioaddr, buf, len);
82 static inline void io_insb(unsigned long addr, void *buf, int len)
87 *bp++ = __builtin_read8((volatile void __iomem *) addr);
90 static inline void io_insw(unsigned long addr, void *buf, int len)
95 *bp++ = __builtin_read16((volatile void __iomem *) addr);
98 extern void __insl_ns(unsigned long addr, void *buf, int len);
99 extern void __insl_sw(unsigned long addr, void *buf, int len);
100 static inline void __insl(unsigned long addr, void *buf, int len, int swap)
103 __insl_ns(addr, buf, len);
105 __insl_sw(addr, buf, len);
108 #define mmiowb() mb()
111 * make the short names macros so specific devices
112 * can override them as required
115 static inline void memset_io(volatile void __iomem *addr, unsigned char val, int count)
117 memset((void __force *) addr, val, count);
120 static inline void memcpy_fromio(void *dst, volatile void __iomem *src, int count)
122 memcpy(dst, (void __force *) src, count);
125 static inline void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
127 memcpy((void __force *) dst, src, count);
130 static inline uint8_t inb(unsigned long addr)
132 return __builtin_read8((void *)addr);
135 static inline uint16_t inw(unsigned long addr)
137 uint16_t ret = __builtin_read16((void *)addr);
139 if (__is_PCI_IO(addr))
145 static inline uint32_t inl(unsigned long addr)
147 uint32_t ret = __builtin_read32((void *)addr);
149 if (__is_PCI_IO(addr))
155 static inline void outb(uint8_t datum, unsigned long addr)
157 __builtin_write8((void *)addr, datum);
160 static inline void outw(uint16_t datum, unsigned long addr)
162 if (__is_PCI_IO(addr))
163 datum = _swapw(datum);
164 __builtin_write16((void *)addr, datum);
167 static inline void outl(uint32_t datum, unsigned long addr)
169 if (__is_PCI_IO(addr))
170 datum = _swapl(datum);
171 __builtin_write32((void *)addr, datum);
174 #define inb_p(addr) inb(addr)
175 #define inw_p(addr) inw(addr)
176 #define inl_p(addr) inl(addr)
177 #define outb_p(x,addr) outb(x,addr)
178 #define outw_p(x,addr) outw(x,addr)
179 #define outl_p(x,addr) outl(x,addr)
181 #define outsb(a,b,l) io_outsb(a,b,l)
182 #define outsw(a,b,l) io_outsw(a,b,l)
183 #define outsl(a,b,l) __outsl(a,b,l,0)
185 #define insb(a,b,l) io_insb(a,b,l)
186 #define insw(a,b,l) io_insw(a,b,l)
187 #define insl(a,b,l) __insl(a,b,l,0)
189 #define IO_SPACE_LIMIT 0xffffffff
191 static inline uint8_t readb(const volatile void __iomem *addr)
193 return __builtin_read8((volatile uint8_t __force *) addr);
196 static inline uint16_t readw(const volatile void __iomem *addr)
198 uint16_t ret = __builtin_read16((volatile uint16_t __force *)addr);
200 if (__is_PCI_MEM(addr))
205 static inline uint32_t readl(const volatile void __iomem *addr)
207 uint32_t ret = __builtin_read32((volatile uint32_t __force *)addr);
209 if (__is_PCI_MEM(addr))
215 #define readb_relaxed readb
216 #define readw_relaxed readw
217 #define readl_relaxed readl
219 static inline void writeb(uint8_t datum, volatile void __iomem *addr)
221 __builtin_write8((volatile uint8_t __force *) addr, datum);
222 if (__is_PCI_MEM(addr))
223 __flush_PCI_writes();
226 static inline void writew(uint16_t datum, volatile void __iomem *addr)
228 if (__is_PCI_MEM(addr))
229 datum = _swapw(datum);
231 __builtin_write16((volatile uint16_t __force *) addr, datum);
232 if (__is_PCI_MEM(addr))
233 __flush_PCI_writes();
236 static inline void writel(uint32_t datum, volatile void __iomem *addr)
238 if (__is_PCI_MEM(addr))
239 datum = _swapl(datum);
241 __builtin_write32((volatile uint32_t __force *) addr, datum);
242 if (__is_PCI_MEM(addr))
243 __flush_PCI_writes();
247 /* Values for nocacheflag and cmode */
248 #define IOMAP_FULL_CACHING 0
249 #define IOMAP_NOCACHE_SER 1
250 #define IOMAP_NOCACHE_NONSER 2
251 #define IOMAP_WRITETHROUGH 3
253 extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size, int cacheflag);
255 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
257 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
260 static inline void __iomem *ioremap_nocache(unsigned long physaddr, unsigned long size)
262 return __ioremap(physaddr, size, IOMAP_NOCACHE_SER);
265 static inline void __iomem *ioremap_writethrough(unsigned long physaddr, unsigned long size)
267 return __ioremap(physaddr, size, IOMAP_WRITETHROUGH);
270 static inline void __iomem *ioremap_fullcache(unsigned long physaddr, unsigned long size)
272 return __ioremap(physaddr, size, IOMAP_FULL_CACHING);
275 extern void iounmap(void __iomem *addr);
277 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
279 return (void __iomem *) port;
282 static inline void ioport_unmap(void __iomem *p)
286 static inline void flush_write_buffers(void)
288 __asm__ __volatile__ ("membar" : : :"memory");
292 * do appropriate I/O accesses for token type
294 static inline unsigned int ioread8(void __iomem *p)
296 return __builtin_read8(p);
299 static inline unsigned int ioread16(void __iomem *p)
301 uint16_t ret = __builtin_read16(p);
302 if (__is_PCI_addr(p))
307 static inline unsigned int ioread32(void __iomem *p)
309 uint32_t ret = __builtin_read32(p);
310 if (__is_PCI_addr(p))
315 static inline void iowrite8(u8 val, void __iomem *p)
317 __builtin_write8(p, val);
319 __flush_PCI_writes();
322 static inline void iowrite16(u16 val, void __iomem *p)
324 if (__is_PCI_addr(p))
326 __builtin_write16(p, val);
328 __flush_PCI_writes();
331 static inline void iowrite32(u32 val, void __iomem *p)
333 if (__is_PCI_addr(p))
335 __builtin_write32(p, val);
337 __flush_PCI_writes();
340 static inline void ioread8_rep(void __iomem *p, void *dst, unsigned long count)
342 io_insb((unsigned long) p, dst, count);
345 static inline void ioread16_rep(void __iomem *p, void *dst, unsigned long count)
347 io_insw((unsigned long) p, dst, count);
350 static inline void ioread32_rep(void __iomem *p, void *dst, unsigned long count)
352 __insl_ns((unsigned long) p, dst, count);
355 static inline void iowrite8_rep(void __iomem *p, const void *src, unsigned long count)
357 io_outsb((unsigned long) p, src, count);
360 static inline void iowrite16_rep(void __iomem *p, const void *src, unsigned long count)
362 io_outsw((unsigned long) p, src, count);
365 static inline void iowrite32_rep(void __iomem *p, const void *src, unsigned long count)
367 __outsl_ns((unsigned long) p, src, count);
370 /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
372 extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
373 static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
379 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
382 #define xlate_dev_mem_ptr(p) __va(p)
385 * Convert a virtual cached pointer to an uncached pointer
387 #define xlate_dev_kmem_ptr(p) p
390 * Check BIOS signature
392 static inline int check_signature(volatile void __iomem *io_addr,
393 const unsigned char *signature, int length)
398 if (readb(io_addr) != *signature)
410 #endif /* __KERNEL__ */
412 #endif /* _ASM_IO_H */