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diff --git a/include/asm-arm/arch-ixp4xx/io.h b/include/asm-arm/arch-ixp4xx/io.h
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1/*
2 * linux/include/asm-arm/arch-ixp4xx/io.h
3 *
4 * Author: Deepak Saxena <dsaxena@plexity.net>
5 *
6 * Copyright (C) 2002-2005 MontaVista Software, Inc.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#ifndef __ASM_ARM_ARCH_IO_H
14#define __ASM_ARM_ARCH_IO_H
15
16#include <linux/bitops.h>
17
18#include <asm/arch/hardware.h>
19
20#define IO_SPACE_LIMIT 0xffff0000
21
22extern int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
23extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data);
24
25
26/*
27 * IXP4xx provides two methods of accessing PCI memory space:
28 *
29 * 1) A direct mapped window from 0x48000000 to 0x4bffffff (64MB).
30 * To access PCI via this space, we simply ioremap() the BAR
31 * into the kernel and we can use the standard read[bwl]/write[bwl]
32 * macros. This is the preffered method due to speed but it
33 * limits the system to just 64MB of PCI memory. This can be
34 * problamatic if using video cards and other memory-heavy
35 * targets.
36 *
37 * 2) If > 64MB of memory space is required, the IXP4xx can be configured
38 * to use indirect registers to access PCI (as we do below for I/O
39 * transactions). This allows for up to 128MB (0x48000000 to 0x4fffffff)
40 * of memory on the bus. The disadvantage of this is that every
41 * PCI access requires three local register accesses plus a spinlock,
42 * but in some cases the performance hit is acceptable. In addition,
43 * you cannot mmap() PCI devices in this case.
44 *
45 */
46#ifndef CONFIG_IXP4XX_INDIRECT_PCI
47
48#define __mem_pci(a) (a)
49
50#else
51
52#include <linux/mm.h>
53
54/*
55 * In the case of using indirect PCI, we simply return the actual PCI
56 * address and our read/write implementation use that to drive the
57 * access registers. If something outside of PCI is ioremap'd, we
58 * fallback to the default.
59 */
60static inline void __iomem *
61__ixp4xx_ioremap(unsigned long addr, size_t size, unsigned int mtype)
62{
63 if((addr < PCIBIOS_MIN_MEM) || (addr > 0x4fffffff))
64 return __arm_ioremap(addr, size, mtype);
65
66 return (void __iomem *)addr;
67}
68
69static inline void
70__ixp4xx_iounmap(void __iomem *addr)
71{
72 if ((__force u32)addr >= VMALLOC_START)
73 __iounmap(addr);
74}
75
76#define __arch_ioremap(a, s, f) __ixp4xx_ioremap(a, s, f)
77#define __arch_iounmap(a) __ixp4xx_iounmap(a)
78
79#define writeb(v, p) __ixp4xx_writeb(v, p)
80#define writew(v, p) __ixp4xx_writew(v, p)
81#define writel(v, p) __ixp4xx_writel(v, p)
82
83#define writesb(p, v, l) __ixp4xx_writesb(p, v, l)
84#define writesw(p, v, l) __ixp4xx_writesw(p, v, l)
85#define writesl(p, v, l) __ixp4xx_writesl(p, v, l)
86
87#define readb(p) __ixp4xx_readb(p)
88#define readw(p) __ixp4xx_readw(p)
89#define readl(p) __ixp4xx_readl(p)
90
91#define readsb(p, v, l) __ixp4xx_readsb(p, v, l)
92#define readsw(p, v, l) __ixp4xx_readsw(p, v, l)
93#define readsl(p, v, l) __ixp4xx_readsl(p, v, l)
94
95static inline void
96__ixp4xx_writeb(u8 value, volatile void __iomem *p)
97{
98 u32 addr = (u32)p;
99 u32 n, byte_enables, data;
100
101 if (addr >= VMALLOC_START) {
102 __raw_writeb(value, addr);
103 return;
104 }
105
106 n = addr % 4;
107 byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
108 data = value << (8*n);
109 ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
110}
111
112static inline void
113__ixp4xx_writesb(volatile void __iomem *bus_addr, const u8 *vaddr, int count)
114{
115 while (count--)
116 writeb(*vaddr++, bus_addr);
117}
118
119static inline void
120__ixp4xx_writew(u16 value, volatile void __iomem *p)
121{
122 u32 addr = (u32)p;
123 u32 n, byte_enables, data;
124
125 if (addr >= VMALLOC_START) {
126 __raw_writew(value, addr);
127 return;
128 }
129
130 n = addr % 4;
131 byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
132 data = value << (8*n);
133 ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
134}
135
136static inline void
137__ixp4xx_writesw(volatile void __iomem *bus_addr, const u16 *vaddr, int count)
138{
139 while (count--)
140 writew(*vaddr++, bus_addr);
141}
142
143static inline void
144__ixp4xx_writel(u32 value, volatile void __iomem *p)
145{
146 u32 addr = (__force u32)p;
147 if (addr >= VMALLOC_START) {
148 __raw_writel(value, p);
149 return;
150 }
151
152 ixp4xx_pci_write(addr, NP_CMD_MEMWRITE, value);
153}
154
155static inline void
156__ixp4xx_writesl(volatile void __iomem *bus_addr, const u32 *vaddr, int count)
157{
158 while (count--)
159 writel(*vaddr++, bus_addr);
160}
161
162static inline unsigned char
163__ixp4xx_readb(const volatile void __iomem *p)
164{
165 u32 addr = (u32)p;
166 u32 n, byte_enables, data;
167
168 if (addr >= VMALLOC_START)
169 return __raw_readb(addr);
170
171 n = addr % 4;
172 byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
173 if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
174 return 0xff;
175
176 return data >> (8*n);
177}
178
179static inline void
180__ixp4xx_readsb(const volatile void __iomem *bus_addr, u8 *vaddr, u32 count)
181{
182 while (count--)
183 *vaddr++ = readb(bus_addr);
184}
185
186static inline unsigned short
187__ixp4xx_readw(const volatile void __iomem *p)
188{
189 u32 addr = (u32)p;
190 u32 n, byte_enables, data;
191
192 if (addr >= VMALLOC_START)
193 return __raw_readw(addr);
194
195 n = addr % 4;
196 byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
197 if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
198 return 0xffff;
199
200 return data>>(8*n);
201}
202
203static inline void
204__ixp4xx_readsw(const volatile void __iomem *bus_addr, u16 *vaddr, u32 count)
205{
206 while (count--)
207 *vaddr++ = readw(bus_addr);
208}
209
210static inline unsigned long
211__ixp4xx_readl(const volatile void __iomem *p)
212{
213 u32 addr = (__force u32)p;
214 u32 data;
215
216 if (addr >= VMALLOC_START)
217 return __raw_readl(p);
218
219 if (ixp4xx_pci_read(addr, NP_CMD_MEMREAD, &data))
220 return 0xffffffff;
221
222 return data;
223}
224
225static inline void
226__ixp4xx_readsl(const volatile void __iomem *bus_addr, u32 *vaddr, u32 count)
227{
228 while (count--)
229 *vaddr++ = readl(bus_addr);
230}
231
232
233/*
234 * We can use the built-in functions b/c they end up calling writeb/readb
235 */
236#define memset_io(c,v,l) _memset_io((c),(v),(l))
237#define memcpy_fromio(a,c,l) _memcpy_fromio((a),(c),(l))
238#define memcpy_toio(c,a,l) _memcpy_toio((c),(a),(l))
239
240#endif
241
242#ifndef CONFIG_PCI
243
244#define __io(v) v
245
246#else
247
248/*
249 * IXP4xx does not have a transparent cpu -> PCI I/O translation
250 * window. Instead, it has a set of registers that must be tweaked
251 * with the proper byte lanes, command types, and address for the
252 * transaction. This means that we need to override the default
253 * I/O functions.
254 */
255#define outb(p, v) __ixp4xx_outb(p, v)
256#define outw(p, v) __ixp4xx_outw(p, v)
257#define outl(p, v) __ixp4xx_outl(p, v)
258
259#define outsb(p, v, l) __ixp4xx_outsb(p, v, l)
260#define outsw(p, v, l) __ixp4xx_outsw(p, v, l)
261#define outsl(p, v, l) __ixp4xx_outsl(p, v, l)
262
263#define inb(p) __ixp4xx_inb(p)
264#define inw(p) __ixp4xx_inw(p)
265#define inl(p) __ixp4xx_inl(p)
266
267#define insb(p, v, l) __ixp4xx_insb(p, v, l)
268#define insw(p, v, l) __ixp4xx_insw(p, v, l)
269#define insl(p, v, l) __ixp4xx_insl(p, v, l)
270
271
272static inline void
273__ixp4xx_outb(u8 value, u32 addr)
274{
275 u32 n, byte_enables, data;
276 n = addr % 4;
277 byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
278 data = value << (8*n);
279 ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
280}
281
282static inline void
283__ixp4xx_outsb(u32 io_addr, const u8 *vaddr, u32 count)
284{
285 while (count--)
286 outb(*vaddr++, io_addr);
287}
288
289static inline void
290__ixp4xx_outw(u16 value, u32 addr)
291{
292 u32 n, byte_enables, data;
293 n = addr % 4;
294 byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
295 data = value << (8*n);
296 ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
297}
298
299static inline void
300__ixp4xx_outsw(u32 io_addr, const u16 *vaddr, u32 count)
301{
302 while (count--)
303 outw(cpu_to_le16(*vaddr++), io_addr);
304}
305
306static inline void
307__ixp4xx_outl(u32 value, u32 addr)
308{
309 ixp4xx_pci_write(addr, NP_CMD_IOWRITE, value);
310}
311
312static inline void
313__ixp4xx_outsl(u32 io_addr, const u32 *vaddr, u32 count)
314{
315 while (count--)
316 outl(*vaddr++, io_addr);
317}
318
319static inline u8
320__ixp4xx_inb(u32 addr)
321{
322 u32 n, byte_enables, data;
323 n = addr % 4;
324 byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
325 if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
326 return 0xff;
327
328 return data >> (8*n);
329}
330
331static inline void
332__ixp4xx_insb(u32 io_addr, u8 *vaddr, u32 count)
333{
334 while (count--)
335 *vaddr++ = inb(io_addr);
336}
337
338static inline u16
339__ixp4xx_inw(u32 addr)
340{
341 u32 n, byte_enables, data;
342 n = addr % 4;
343 byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
344 if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
345 return 0xffff;
346
347 return data>>(8*n);
348}
349
350static inline void
351__ixp4xx_insw(u32 io_addr, u16 *vaddr, u32 count)
352{
353 while (count--)
354 *vaddr++ = le16_to_cpu(inw(io_addr));
355}
356
357static inline u32
358__ixp4xx_inl(u32 addr)
359{
360 u32 data;
361 if (ixp4xx_pci_read(addr, NP_CMD_IOREAD, &data))
362 return 0xffffffff;
363
364 return data;
365}
366
367static inline void
368__ixp4xx_insl(u32 io_addr, u32 *vaddr, u32 count)
369{
370 while (count--)
371 *vaddr++ = inl(io_addr);
372}
373
374#define PIO_OFFSET 0x10000UL
375#define PIO_MASK 0x0ffffUL
376
377#define __is_io_address(p) (((unsigned long)p >= PIO_OFFSET) && \
378 ((unsigned long)p <= (PIO_MASK + PIO_OFFSET)))
379static inline unsigned int
380__ixp4xx_ioread8(const void __iomem *addr)
381{
382 unsigned long port = (unsigned long __force)addr;
383 if (__is_io_address(port))
384 return (unsigned int)__ixp4xx_inb(port & PIO_MASK);
385 else
386#ifndef CONFIG_IXP4XX_INDIRECT_PCI
387 return (unsigned int)__raw_readb(port);
388#else
389 return (unsigned int)__ixp4xx_readb(addr);
390#endif
391}
392
393static inline void
394__ixp4xx_ioread8_rep(const void __iomem *addr, void *vaddr, u32 count)
395{
396 unsigned long port = (unsigned long __force)addr;
397 if (__is_io_address(port))
398 __ixp4xx_insb(port & PIO_MASK, vaddr, count);
399 else
400#ifndef CONFIG_IXP4XX_INDIRECT_PCI
401 __raw_readsb(addr, vaddr, count);
402#else
403 __ixp4xx_readsb(addr, vaddr, count);
404#endif
405}
406
407static inline unsigned int
408__ixp4xx_ioread16(const void __iomem *addr)
409{
410 unsigned long port = (unsigned long __force)addr;
411 if (__is_io_address(port))
412 return (unsigned int)__ixp4xx_inw(port & PIO_MASK);
413 else
414#ifndef CONFIG_IXP4XX_INDIRECT_PCI
415 return le16_to_cpu(__raw_readw((u32)port));
416#else
417 return (unsigned int)__ixp4xx_readw(addr);
418#endif
419}
420
421static inline void
422__ixp4xx_ioread16_rep(const void __iomem *addr, void *vaddr, u32 count)
423{
424 unsigned long port = (unsigned long __force)addr;
425 if (__is_io_address(port))
426 __ixp4xx_insw(port & PIO_MASK, vaddr, count);
427 else
428#ifndef CONFIG_IXP4XX_INDIRECT_PCI
429 __raw_readsw(addr, vaddr, count);
430#else
431 __ixp4xx_readsw(addr, vaddr, count);
432#endif
433}
434
435static inline unsigned int
436__ixp4xx_ioread32(const void __iomem *addr)
437{
438 unsigned long port = (unsigned long __force)addr;
439 if (__is_io_address(port))
440 return (unsigned int)__ixp4xx_inl(port & PIO_MASK);
441 else {
442#ifndef CONFIG_IXP4XX_INDIRECT_PCI
443 return le32_to_cpu((__force __le32)__raw_readl(addr));
444#else
445 return (unsigned int)__ixp4xx_readl(addr);
446#endif
447 }
448}
449
450static inline void
451__ixp4xx_ioread32_rep(const void __iomem *addr, void *vaddr, u32 count)
452{
453 unsigned long port = (unsigned long __force)addr;
454 if (__is_io_address(port))
455 __ixp4xx_insl(port & PIO_MASK, vaddr, count);
456 else
457#ifndef CONFIG_IXP4XX_INDIRECT_PCI
458 __raw_readsl(addr, vaddr, count);
459#else
460 __ixp4xx_readsl(addr, vaddr, count);
461#endif
462}
463
464static inline void
465__ixp4xx_iowrite8(u8 value, void __iomem *addr)
466{
467 unsigned long port = (unsigned long __force)addr;
468 if (__is_io_address(port))
469 __ixp4xx_outb(value, port & PIO_MASK);
470 else
471#ifndef CONFIG_IXP4XX_INDIRECT_PCI
472 __raw_writeb(value, port);
473#else
474 __ixp4xx_writeb(value, addr);
475#endif
476}
477
478static inline void
479__ixp4xx_iowrite8_rep(void __iomem *addr, const void *vaddr, u32 count)
480{
481 unsigned long port = (unsigned long __force)addr;
482 if (__is_io_address(port))
483 __ixp4xx_outsb(port & PIO_MASK, vaddr, count);
484 else
485#ifndef CONFIG_IXP4XX_INDIRECT_PCI
486 __raw_writesb(addr, vaddr, count);
487#else
488 __ixp4xx_writesb(addr, vaddr, count);
489#endif
490}
491
492static inline void
493__ixp4xx_iowrite16(u16 value, void __iomem *addr)
494{
495 unsigned long port = (unsigned long __force)addr;
496 if (__is_io_address(port))
497 __ixp4xx_outw(value, port & PIO_MASK);
498 else
499#ifndef CONFIG_IXP4XX_INDIRECT_PCI
500 __raw_writew(cpu_to_le16(value), addr);
501#else
502 __ixp4xx_writew(value, addr);
503#endif
504}
505
506static inline void
507__ixp4xx_iowrite16_rep(void __iomem *addr, const void *vaddr, u32 count)
508{
509 unsigned long port = (unsigned long __force)addr;
510 if (__is_io_address(port))
511 __ixp4xx_outsw(port & PIO_MASK, vaddr, count);
512 else
513#ifndef CONFIG_IXP4XX_INDIRECT_PCI
514 __raw_writesw(addr, vaddr, count);
515#else
516 __ixp4xx_writesw(addr, vaddr, count);
517#endif
518}
519
520static inline void
521__ixp4xx_iowrite32(u32 value, void __iomem *addr)
522{
523 unsigned long port = (unsigned long __force)addr;
524 if (__is_io_address(port))
525 __ixp4xx_outl(value, port & PIO_MASK);
526 else
527#ifndef CONFIG_IXP4XX_INDIRECT_PCI
528 __raw_writel((u32 __force)cpu_to_le32(value), addr);
529#else
530 __ixp4xx_writel(value, addr);
531#endif
532}
533
534static inline void
535__ixp4xx_iowrite32_rep(void __iomem *addr, const void *vaddr, u32 count)
536{
537 unsigned long port = (unsigned long __force)addr;
538 if (__is_io_address(port))
539 __ixp4xx_outsl(port & PIO_MASK, vaddr, count);
540 else
541#ifndef CONFIG_IXP4XX_INDIRECT_PCI
542 __raw_writesl(addr, vaddr, count);
543#else
544 __ixp4xx_writesl(addr, vaddr, count);
545#endif
546}
547
548#define ioread8(p) __ixp4xx_ioread8(p)
549#define ioread16(p) __ixp4xx_ioread16(p)
550#define ioread32(p) __ixp4xx_ioread32(p)
551
552#define ioread8_rep(p, v, c) __ixp4xx_ioread8_rep(p, v, c)
553#define ioread16_rep(p, v, c) __ixp4xx_ioread16_rep(p, v, c)
554#define ioread32_rep(p, v, c) __ixp4xx_ioread32_rep(p, v, c)
555
556#define iowrite8(v,p) __ixp4xx_iowrite8(v,p)
557#define iowrite16(v,p) __ixp4xx_iowrite16(v,p)
558#define iowrite32(v,p) __ixp4xx_iowrite32(v,p)
559
560#define iowrite8_rep(p, v, c) __ixp4xx_iowrite8_rep(p, v, c)
561#define iowrite16_rep(p, v, c) __ixp4xx_iowrite16_rep(p, v, c)
562#define iowrite32_rep(p, v, c) __ixp4xx_iowrite32_rep(p, v, c)
563
564#define ioport_map(port, nr) ((void __iomem*)(port + PIO_OFFSET))
565#define ioport_unmap(addr)
566#endif // !CONFIG_PCI
567
568#endif // __ASM_ARM_ARCH_IO_H
569
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