summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-ixp4xx/include/mach/io.h
blob: 6ea7e2fb2701b755830d4285da7266bec3591c04 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
/*
 * arch/arm/mach-ixp4xx/include/mach/io.h
 *
 * Author: Deepak Saxena <dsaxena@plexity.net>
 *
 * Copyright (C) 2002-2005  MontaVista Software, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef __ASM_ARM_ARCH_IO_H
#define __ASM_ARM_ARCH_IO_H

#include <linux/bitops.h>

#include <mach/hardware.h>

#define IO_SPACE_LIMIT 0x0000ffff

extern int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data);


/*
 * IXP4xx provides two methods of accessing PCI memory space:
 *
 * 1) A direct mapped window from 0x48000000 to 0x4BFFFFFF (64MB).
 *    To access PCI via this space, we simply ioremap() the BAR
 *    into the kernel and we can use the standard read[bwl]/write[bwl]
 *    macros. This is the preffered method due to speed but it
 *    limits the system to just 64MB of PCI memory. This can be
 *    problematic if using video cards and other memory-heavy targets.
 *
 * 2) If > 64MB of memory space is required, the IXP4xx can use indirect
 *    registers to access the whole 4 GB of PCI memory space (as we do below
 *    for I/O transactions). This allows currently for up to 1 GB (0x10000000
 *    to 0x4FFFFFFF) of memory on the bus. The disadvantage of this is that
 *    every PCI access requires three local register accesses plus a spinlock,
 *    but in some cases the performance hit is acceptable. In addition, you
 *    cannot mmap() PCI devices in this case.
 */
#ifndef	CONFIG_IXP4XX_INDIRECT_PCI

#define __mem_pci(a)		(a)

#else

/*
 * In the case of using indirect PCI, we simply return the actual PCI
 * address and our read/write implementation use that to drive the 
 * access registers. If something outside of PCI is ioremap'd, we
 * fallback to the default.
 */

static inline int is_pci_memory(u32 addr)
{
	return (addr >= PCIBIOS_MIN_MEM) && (addr <= 0x4FFFFFFF);
}

static inline void __iomem * __indirect_ioremap(unsigned long addr, size_t size,
						unsigned int mtype)
{
	if (!is_pci_memory(addr))
		return __arm_ioremap(addr, size, mtype);

	return (void __iomem *)addr;
}

static inline void __indirect_iounmap(void __iomem *addr)
{
	if (!is_pci_memory((__force u32)addr))
		__iounmap(addr);
}

#define __arch_ioremap(a, s, f)		__indirect_ioremap(a, s, f)
#define __arch_iounmap(a)		__indirect_iounmap(a)

#define writeb(v, p)			__indirect_writeb(v, p)
#define writew(v, p)			__indirect_writew(v, p)
#define writel(v, p)			__indirect_writel(v, p)

#define writesb(p, v, l)		__indirect_writesb(p, v, l)
#define writesw(p, v, l)		__indirect_writesw(p, v, l)
#define writesl(p, v, l)		__indirect_writesl(p, v, l)

#define readb(p)			__indirect_readb(p)
#define readw(p)			__indirect_readw(p)
#define readl(p)			__indirect_readl(p)

#define readsb(p, v, l)			__indirect_readsb(p, v, l)
#define readsw(p, v, l)			__indirect_readsw(p, v, l)
#define readsl(p, v, l)			__indirect_readsl(p, v, l)

static inline void __indirect_writeb(u8 value, volatile void __iomem *p)
{
	u32 addr = (u32)p;
	u32 n, byte_enables, data;

	if (!is_pci_memory(addr)) {
		__raw_writeb(value, addr);
		return;
	}

	n = addr % 4;
	byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
	data = value << (8*n);
	ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
}

static inline void __indirect_writesb(volatile void __iomem *bus_addr,
				      const u8 *vaddr, int count)
{
	while (count--)
		writeb(*vaddr++, bus_addr);
}

static inline void __indirect_writew(u16 value, volatile void __iomem *p)
{
	u32 addr = (u32)p;
	u32 n, byte_enables, data;

	if (!is_pci_memory(addr)) {
		__raw_writew(value, addr);
		return;
	}

	n = addr % 4;
	byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
	data = value << (8*n);
	ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
}

static inline void __indirect_writesw(volatile void __iomem *bus_addr,
				      const u16 *vaddr, int count)
{
	while (count--)
		writew(*vaddr++, bus_addr);
}

static inline void __indirect_writel(u32 value, volatile void __iomem *p)
{
	u32 addr = (__force u32)p;

	if (!is_pci_memory(addr)) {
		__raw_writel(value, p);
		return;
	}

	ixp4xx_pci_write(addr, NP_CMD_MEMWRITE, value);
}

static inline void __indirect_writesl(volatile void __iomem *bus_addr,
				      const u32 *vaddr, int count)
{
	while (count--)
		writel(*vaddr++, bus_addr);
}

static inline unsigned char __indirect_readb(const volatile void __iomem *p)
{
	u32 addr = (u32)p;
	u32 n, byte_enables, data;

	if (!is_pci_memory(addr))
		return __raw_readb(addr);

	n = addr % 4;
	byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
	if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
		return 0xff;

	return data >> (8*n);
}

static inline void __indirect_readsb(const volatile void __iomem *bus_addr,
				     u8 *vaddr, u32 count)
{
	while (count--)
		*vaddr++ = readb(bus_addr);
}

static inline unsigned short __indirect_readw(const volatile void __iomem *p)
{
	u32 addr = (u32)p;
	u32 n, byte_enables, data;

	if (!is_pci_memory(addr))
		return __raw_readw(addr);

	n = addr % 4;
	byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
	if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
		return 0xffff;

	return data>>(8*n);
}

static inline void __indirect_readsw(const volatile void __iomem *bus_addr,
				     u16 *vaddr, u32 count)
{
	while (count--)
		*vaddr++ = readw(bus_addr);
}

static inline unsigned long __indirect_readl(const volatile void __iomem *p)
{
	u32 addr = (__force u32)p;
	u32 data;

	if (!is_pci_memory(addr))
		return __raw_readl(p);

	if (ixp4xx_pci_read(addr, NP_CMD_MEMREAD, &data))
		return 0xffffffff;

	return data;
}

static inline void __indirect_readsl(const volatile void __iomem *bus_addr,
				     u32 *vaddr, u32 count)
{
	while (count--)
		*vaddr++ = readl(bus_addr);
}


/*
 * We can use the built-in functions b/c they end up calling writeb/readb
 */
#define memset_io(c,v,l)		_memset_io((c),(v),(l))
#define memcpy_fromio(a,c,l)		_memcpy_fromio((a),(c),(l))
#define memcpy_toio(c,a,l)		_memcpy_toio((c),(a),(l))

#endif /* CONFIG_IXP4XX_INDIRECT_PCI */

#ifndef CONFIG_PCI

#define	__io(v)		__typesafe_io(v)

#else

/*
 * IXP4xx does not have a transparent cpu -> PCI I/O translation
 * window.  Instead, it has a set of registers that must be tweaked
 * with the proper byte lanes, command types, and address for the
 * transaction.  This means that we need to override the default
 * I/O functions.
 */

static inline void outb(u8 value, u32 addr)
{
	u32 n, byte_enables, data;
	n = addr % 4;
	byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
	data = value << (8*n);
	ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
}

static inline void outsb(u32 io_addr, const u8 *vaddr, u32 count)
{
	while (count--)
		outb(*vaddr++, io_addr);
}

static inline void outw(u16 value, u32 addr)
{
	u32 n, byte_enables, data;
	n = addr % 4;
	byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
	data = value << (8*n);
	ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
}

static inline void outsw(u32 io_addr, const u16 *vaddr, u32 count)
{
	while (count--)
		outw(cpu_to_le16(*vaddr++), io_addr);
}

static inline void outl(u32 value, u32 addr)
{
	ixp4xx_pci_write(addr, NP_CMD_IOWRITE, value);
}

static inline void outsl(u32 io_addr, const u32 *vaddr, u32 count)
{
	while (count--)
		outl(cpu_to_le32(*vaddr++), io_addr);
}

static inline u8 inb(u32 addr)
{
	u32 n, byte_enables, data;
	n = addr % 4;
	byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
	if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
		return 0xff;

	return data >> (8*n);
}

static inline void insb(u32 io_addr, u8 *vaddr, u32 count)
{
	while (count--)
		*vaddr++ = inb(io_addr);
}

static inline u16 inw(u32 addr)
{
	u32 n, byte_enables, data;
	n = addr % 4;
	byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
	if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
		return 0xffff;

	return data>>(8*n);
}

static inline void insw(u32 io_addr, u16 *vaddr, u32 count)
{
	while (count--)
		*vaddr++ = le16_to_cpu(inw(io_addr));
}

static inline u32 inl(u32 addr)
{
	u32 data;
	if (ixp4xx_pci_read(addr, NP_CMD_IOREAD, &data))
		return 0xffffffff;

	return data;
}

static inline void insl(u32 io_addr, u32 *vaddr, u32 count)
{
	while (count--)
		*vaddr++ = le32_to_cpu(inl(io_addr));
}

#define PIO_OFFSET      0x10000UL
#define PIO_MASK        0x0ffffUL

#define	__is_io_address(p)	(((unsigned long)p >= PIO_OFFSET) && \
					((unsigned long)p <= (PIO_MASK + PIO_OFFSET)))

#define	ioread8(p)			ioread8(p)
static inline unsigned int ioread8(const void __iomem *addr)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		return (unsigned int)inb(port & PIO_MASK);
	else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
		return (unsigned int)__raw_readb(port);
#else
		return (unsigned int)__indirect_readb(addr);
#endif
}

#define	ioread8_rep(p, v, c)		ioread8_rep(p, v, c)
static inline void ioread8_rep(const void __iomem *addr, void *vaddr, u32 count)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		insb(port & PIO_MASK, vaddr, count);
	else
#ifndef	CONFIG_IXP4XX_INDIRECT_PCI
		__raw_readsb(addr, vaddr, count);
#else
		__indirect_readsb(addr, vaddr, count);
#endif
}

#define	ioread16(p)			ioread16(p)
static inline unsigned int ioread16(const void __iomem *addr)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		return	(unsigned int)inw(port & PIO_MASK);
	else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
		return le16_to_cpu(__raw_readw((u32)port));
#else
		return (unsigned int)__indirect_readw(addr);
#endif
}

#define	ioread16_rep(p, v, c)		ioread16_rep(p, v, c)
static inline void ioread16_rep(const void __iomem *addr, void *vaddr,
				u32 count)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		insw(port & PIO_MASK, vaddr, count);
	else
#ifndef	CONFIG_IXP4XX_INDIRECT_PCI
		__raw_readsw(addr, vaddr, count);
#else
		__indirect_readsw(addr, vaddr, count);
#endif
}

#define	ioread32(p)			ioread32(p)
static inline unsigned int ioread32(const void __iomem *addr)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		return	(unsigned int)inl(port & PIO_MASK);
	else {
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
		return le32_to_cpu((__force __le32)__raw_readl(addr));
#else
		return (unsigned int)__indirect_readl(addr);
#endif
	}
}

#define	ioread32_rep(p, v, c)		ioread32_rep(p, v, c)
static inline void ioread32_rep(const void __iomem *addr, void *vaddr,
				u32 count)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		insl(port & PIO_MASK, vaddr, count);
	else
#ifndef	CONFIG_IXP4XX_INDIRECT_PCI
		__raw_readsl(addr, vaddr, count);
#else
		__indirect_readsl(addr, vaddr, count);
#endif
}

#define	iowrite8(v, p)			iowrite8(v, p)
static inline void iowrite8(u8 value, void __iomem *addr)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		outb(value, port & PIO_MASK);
	else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
		__raw_writeb(value, port);
#else
		__indirect_writeb(value, addr);
#endif
}

#define	iowrite8_rep(p, v, c)		iowrite8_rep(p, v, c)
static inline void iowrite8_rep(void __iomem *addr, const void *vaddr,
				u32 count)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		outsb(port & PIO_MASK, vaddr, count);
	else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
		__raw_writesb(addr, vaddr, count);
#else
		__indirect_writesb(addr, vaddr, count);
#endif
}

#define	iowrite16(v, p)			iowrite16(v, p)
static inline void iowrite16(u16 value, void __iomem *addr)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		outw(value, port & PIO_MASK);
	else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
		__raw_writew(cpu_to_le16(value), addr);
#else
		__indirect_writew(value, addr);
#endif
}

#define	iowrite16_rep(p, v, c)		iowrite16_rep(p, v, c)
static inline void iowrite16_rep(void __iomem *addr, const void *vaddr,
				 u32 count)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		outsw(port & PIO_MASK, vaddr, count);
	else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
		__raw_writesw(addr, vaddr, count);
#else
		__indirect_writesw(addr, vaddr, count);
#endif
}

#define	iowrite32(v, p)			iowrite32(v, p)
static inline void iowrite32(u32 value, void __iomem *addr)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		outl(value, port & PIO_MASK);
	else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
		__raw_writel((u32 __force)cpu_to_le32(value), addr);
#else
		__indirect_writel(value, addr);
#endif
}

#define	iowrite32_rep(p, v, c)		iowrite32_rep(p, v, c)
static inline void iowrite32_rep(void __iomem *addr, const void *vaddr,
				 u32 count)
{
	unsigned long port = (unsigned long __force)addr;
	if (__is_io_address(port))
		outsl(port & PIO_MASK, vaddr, count);
	else
#ifndef CONFIG_IXP4XX_INDIRECT_PCI
		__raw_writesl(addr, vaddr, count);
#else
		__indirect_writesl(addr, vaddr, count);
#endif
}

#define	ioport_map(port, nr)		((void __iomem*)(port + PIO_OFFSET))
#define	ioport_unmap(addr)
#endif /* CONFIG_PCI */

#endif /* __ASM_ARM_ARCH_IO_H */