5 #include <linux/config.h>
6 #include <linux/types.h>
10 #include <asm/byteorder.h>
13 #define SIO_CONFIG_RA 0x398
14 #define SIO_CONFIG_RD 0x399
18 #define PMAC_ISA_MEM_BASE 0
19 #define PMAC_PCI_DRAM_OFFSET 0
20 #define CHRP_ISA_IO_BASE 0xf8000000
21 #define CHRP_ISA_MEM_BASE 0xf7000000
22 #define CHRP_PCI_DRAM_OFFSET 0
23 #define PREP_ISA_IO_BASE 0x80000000
24 #define PREP_ISA_MEM_BASE 0xc0000000
25 #define PREP_PCI_DRAM_OFFSET 0x80000000
27 #if defined(CONFIG_4xx)
28 #include <asm/ibm4xx.h>
29 #elif defined(CONFIG_8xx)
30 #include <asm/mpc8xx.h>
31 #elif defined(CONFIG_8260)
32 #include <asm/mpc8260.h>
33 #elif defined(CONFIG_APUS)
35 #define _ISA_MEM_BASE 0
36 #define PCI_DRAM_OFFSET 0
37 #else /* Everyone else */
38 #define _IO_BASE isa_io_base
39 #define _ISA_MEM_BASE isa_mem_base
40 #define PCI_DRAM_OFFSET pci_dram_offset
41 #endif /* Platform-dependent I/O */
43 extern unsigned long isa_io_base;
44 extern unsigned long isa_mem_base;
45 extern unsigned long pci_dram_offset;
47 #define readb(addr) in_8((volatile u8 *)(addr))
48 #define writeb(b,addr) out_8((volatile u8 *)(addr), (b))
49 #if defined(CONFIG_APUS)
50 #define readw(addr) (*(volatile u16 *) (addr))
51 #define readl(addr) (*(volatile u32 *) (addr))
52 #define writew(b,addr) ((*(volatile u16 *) (addr)) = (b))
53 #define writel(b,addr) ((*(volatile u32 *) (addr)) = (b))
55 #define readw(addr) in_le16((volatile u16 *)(addr))
56 #define readl(addr) in_le32((volatile u32 *)(addr))
57 #define writew(b,addr) out_le16((volatile u16 *)(addr),(b))
58 #define writel(b,addr) out_le32((volatile u32 *)(addr),(b))
59 #endif /* CONFIG_APUS */
61 #define readb_relaxed(addr) readb(addr)
62 #define readw_relaxed(addr) readw(addr)
63 #define readl_relaxed(addr) readl(addr)
65 #define __raw_readb(addr) (*(volatile unsigned char *)(addr))
66 #define __raw_readw(addr) (*(volatile unsigned short *)(addr))
67 #define __raw_readl(addr) (*(volatile unsigned int *)(addr))
68 #define __raw_writeb(v, addr) (*(volatile unsigned char *)(addr) = (v))
69 #define __raw_writew(v, addr) (*(volatile unsigned short *)(addr) = (v))
70 #define __raw_writel(v, addr) (*(volatile unsigned int *)(addr) = (v))
73 * The insw/outsw/insl/outsl macros don't do byte-swapping.
74 * They are only used in practice for transferring buffers which
75 * are arrays of bytes, and byte-swapping is not appropriate in
78 #define insb(port, buf, ns) _insb((u8 *)((port)+_IO_BASE), (buf), (ns))
79 #define outsb(port, buf, ns) _outsb((u8 *)((port)+_IO_BASE), (buf), (ns))
80 #define insw(port, buf, ns) _insw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
81 #define outsw(port, buf, ns) _outsw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
82 #define insl(port, buf, nl) _insl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
83 #define outsl(port, buf, nl) _outsl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
86 * On powermacs, we will get a machine check exception if we
87 * try to read data from a non-existent I/O port. Because the
88 * machine check is an asynchronous exception, it isn't
89 * well-defined which instruction SRR0 will point to when the
91 * With the sequence below (twi; isync; nop), we have found that
92 * the machine check occurs on one of the three instructions on
93 * all PPC implementations tested so far. The twi and isync are
94 * needed on the 601 (in fact twi; sync works too), the isync and
95 * nop are needed on 604[e|r], and any of twi, sync or isync will
96 * work on 603[e], 750, 74xx.
97 * The twi creates an explicit data dependency on the returned
98 * value which seems to be needed to make the 601 wait for the
102 #define __do_in_asm(name, op) \
103 extern __inline__ unsigned int name(unsigned int port) \
106 __asm__ __volatile__( \
112 ".section .fixup,\"ax\"\n" \
116 ".section __ex_table,\"a\"\n" \
123 : "r" (port + _IO_BASE)); \
127 #define __do_out_asm(name, op) \
128 extern __inline__ void name(unsigned int val, unsigned int port) \
130 __asm__ __volatile__( \
134 ".section __ex_table,\"a\"\n" \
138 : : "r" (val), "r" (port + _IO_BASE)); \
141 __do_in_asm(inb, "lbzx")
142 __do_out_asm(outb, "stbx")
144 __do_in_asm(inw, "lhz%U1%X1")
145 __do_in_asm(inl, "lwz%U1%X1")
146 __do_out_asm(outl,"stw%U0%X0")
147 __do_out_asm(outw, "sth%U0%X0")
149 __do_in_asm(inw, "lhbrx")
150 __do_in_asm(inl, "lwbrx")
151 __do_out_asm(outw, "sthbrx")
152 __do_out_asm(outl, "stwbrx")
155 #define inb_p(port) inb((port))
156 #define outb_p(val, port) outb((val), (port))
157 #define inw_p(port) inw((port))
158 #define outw_p(val, port) outw((val), (port))
159 #define inl_p(port) inl((port))
160 #define outl_p(val, port) outl((val), (port))
162 extern void _insb(volatile u8 *port, void *buf, int ns);
163 extern void _outsb(volatile u8 *port, const void *buf, int ns);
164 extern void _insw(volatile u16 *port, void *buf, int ns);
165 extern void _outsw(volatile u16 *port, const void *buf, int ns);
166 extern void _insl(volatile u32 *port, void *buf, int nl);
167 extern void _outsl(volatile u32 *port, const void *buf, int nl);
168 extern void _insw_ns(volatile u16 *port, void *buf, int ns);
169 extern void _outsw_ns(volatile u16 *port, const void *buf, int ns);
170 extern void _insl_ns(volatile u32 *port, void *buf, int nl);
171 extern void _outsl_ns(volatile u32 *port, const void *buf, int nl);
174 * The *_ns versions below don't do byte-swapping.
175 * Neither do the standard versions now, these are just here
178 #define insw_ns(port, buf, ns) _insw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
179 #define outsw_ns(port, buf, ns) _outsw_ns((u16 *)((port)+_IO_BASE), (buf), (ns))
180 #define insl_ns(port, buf, nl) _insl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
181 #define outsl_ns(port, buf, nl) _outsl_ns((u32 *)((port)+_IO_BASE), (buf), (nl))
184 #define IO_SPACE_LIMIT ~0
186 #define memset_io(a,b,c) memset((void *)(a),(b),(c))
187 #define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c))
188 #define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c))
191 * Map in an area of physical address space, for accessing
194 extern void *__ioremap(phys_addr_t address, unsigned long size,
195 unsigned long flags);
196 extern void *ioremap(phys_addr_t address, unsigned long size);
198 extern void *ioremap64(unsigned long long address, unsigned long size);
200 #define ioremap_nocache(addr, size) ioremap((addr), (size))
201 extern void iounmap(void *addr);
202 extern unsigned long iopa(unsigned long addr);
203 extern unsigned long mm_ptov(unsigned long addr) __attribute_const__;
204 extern void io_block_mapping(unsigned long virt, phys_addr_t phys,
205 unsigned int size, int flags);
208 * The PCI bus is inherently Little-Endian. The PowerPC is being
209 * run Big-Endian. Thus all values which cross the [PCI] barrier
210 * must be endian-adjusted. Also, the local DRAM has a different
211 * address from the PCI point of view, thus buffer addresses also
212 * have to be modified [mapped] appropriately.
214 extern inline unsigned long virt_to_bus(volatile void * address)
217 if (address == (void *)0)
219 return (unsigned long)address - KERNELBASE + PCI_DRAM_OFFSET;
221 return iopa ((unsigned long) address);
225 extern inline void * bus_to_virt(unsigned long address)
230 return (void *)(address - PCI_DRAM_OFFSET + KERNELBASE);
232 return (void*) mm_ptov (address);
237 * Change virtual addresses to physical addresses and vv, for
238 * addresses in the area where the kernel has the RAM mapped.
240 extern inline unsigned long virt_to_phys(volatile void * address)
243 return (unsigned long) address - KERNELBASE;
245 return iopa ((unsigned long) address);
249 extern inline void * phys_to_virt(unsigned long address)
252 return (void *) (address + KERNELBASE);
254 return (void*) mm_ptov (address);
259 * Change "struct page" to physical address.
261 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
262 #define page_to_bus(page) (page_to_phys(page) + PCI_DRAM_OFFSET)
265 * Enforce In-order Execution of I/O:
266 * Acts as a barrier to ensure all previous I/O accesses have
267 * completed before any further ones are issued.
269 extern inline void eieio(void)
271 __asm__ __volatile__ ("eieio" : : : "memory");
274 /* Enforce in-order execution of data I/O.
275 * No distinction between read/write on PPC; use eieio for all three.
277 #define iobarrier_rw() eieio()
278 #define iobarrier_r() eieio()
279 #define iobarrier_w() eieio()
282 * 8, 16 and 32 bit, big and little endian I/O operations, with barrier.
284 * Read operations have additional twi & isync to make sure the read
285 * is actually performed (i.e. the data has come back) before we start
286 * executing any following instructions.
288 extern inline int in_8(volatile unsigned char *addr)
292 __asm__ __volatile__(
295 "isync" : "=r" (ret) : "m" (*addr));
299 extern inline void out_8(volatile unsigned char *addr, int val)
301 __asm__ __volatile__("stb%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
304 extern inline int in_le16(volatile unsigned short *addr)
308 __asm__ __volatile__("lhbrx %0,0,%1;\n"
310 "isync" : "=r" (ret) :
311 "r" (addr), "m" (*addr));
315 extern inline int in_be16(volatile unsigned short *addr)
319 __asm__ __volatile__("lhz%U1%X1 %0,%1;\n"
321 "isync" : "=r" (ret) : "m" (*addr));
325 extern inline void out_le16(volatile unsigned short *addr, int val)
327 __asm__ __volatile__("sthbrx %1,0,%2; eieio" : "=m" (*addr) :
328 "r" (val), "r" (addr));
331 extern inline void out_be16(volatile unsigned short *addr, int val)
333 __asm__ __volatile__("sth%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
336 extern inline unsigned in_le32(volatile unsigned *addr)
340 __asm__ __volatile__("lwbrx %0,0,%1;\n"
342 "isync" : "=r" (ret) :
343 "r" (addr), "m" (*addr));
347 extern inline unsigned in_be32(volatile unsigned *addr)
351 __asm__ __volatile__("lwz%U1%X1 %0,%1;\n"
353 "isync" : "=r" (ret) : "m" (*addr));
357 extern inline void out_le32(volatile unsigned *addr, int val)
359 __asm__ __volatile__("stwbrx %1,0,%2; eieio" : "=m" (*addr) :
360 "r" (val), "r" (addr));
363 extern inline void out_be32(volatile unsigned *addr, int val)
365 __asm__ __volatile__("stw%U0%X0 %1,%0; eieio" : "=m" (*addr) : "r" (val));
368 static inline int check_signature(unsigned long io_addr,
369 const unsigned char *signature, int length)
373 if (readb(io_addr) != *signature)
384 /* Make some pcmcia drivers happy */
385 static inline int isa_check_signature(unsigned long io_addr,
386 const unsigned char *signature, int length)
391 #endif /* _PPC_IO_H */
392 #endif /* __KERNEL__ */