2 * linux/include/asm-arm/arch-ixp4xx/io.h
4 * Author: Deepak Saxena <dsaxena@plexity.net>
6 * Copyright (C) 2002-2005 MontaVista Software, Inc.
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.
13 #ifndef __ASM_ARM_ARCH_IO_H
14 #define __ASM_ARM_ARCH_IO_H
16 #include <asm/hardware.h>
18 #define IO_SPACE_LIMIT 0xffff0000
20 #define BIT(x) ((1)<<(x))
23 extern int (*ixp4xx_pci_read)(u32 addr, u32 cmd, u32* data);
24 extern int ixp4xx_pci_write(u32 addr, u32 cmd, u32 data);
28 * IXP4xx provides two methods of accessing PCI memory space:
30 * 1) A direct mapped window from 0x48000000 to 0x4bffffff (64MB).
31 * To access PCI via this space, we simply ioremap() the BAR
32 * into the kernel and we can use the standard read[bwl]/write[bwl]
33 * macros. This is the preffered method due to speed but it
34 * limits the system to just 64MB of PCI memory. This can be
35 * problamatic if using video cards and other memory-heavy
38 * 2) If > 64MB of memory space is required, the IXP4xx can be configured
39 * to use indirect registers to access PCI (as we do below for I/O
40 * transactions). This allows for up to 128MB (0x48000000 to 0x4fffffff)
41 * of memory on the bus. The disadvantage of this is that every
42 * PCI access requires three local register accesses plus a spinlock,
43 * but in some cases the performance hit is acceptable. In addition,
44 * you cannot mmap() PCI devices in this case.
47 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
49 #define __mem_pci(a) (a)
56 * In the case of using indirect PCI, we simply return the actual PCI
57 * address and our read/write implementation use that to drive the
58 * access registers. If something outside of PCI is ioremap'd, we
59 * fallback to the default.
61 static inline void __iomem *
62 __ixp4xx_ioremap(unsigned long addr, size_t size, unsigned long flags)
64 if((addr < 0x48000000) || (addr > 0x4fffffff))
65 return __ioremap(addr, size, flags);
71 __ixp4xx_iounmap(void __iomem *addr)
73 if ((u32)addr >= VMALLOC_START)
77 #define __arch_ioremap(a, s, f) __ixp4xx_ioremap(a, s, f)
78 #define __arch_iounmap(a) __ixp4xx_iounmap(a)
80 #define writeb(v, p) __ixp4xx_writeb(v, p)
81 #define writew(v, p) __ixp4xx_writew(v, p)
82 #define writel(v, p) __ixp4xx_writel(v, p)
84 #define writesb(p, v, l) __ixp4xx_writesb(p, v, l)
85 #define writesw(p, v, l) __ixp4xx_writesw(p, v, l)
86 #define writesl(p, v, l) __ixp4xx_writesl(p, v, l)
88 #define readb(p) __ixp4xx_readb(p)
89 #define readw(p) __ixp4xx_readw(p)
90 #define readl(p) __ixp4xx_readl(p)
92 #define readsb(p, v, l) __ixp4xx_readsb(p, v, l)
93 #define readsw(p, v, l) __ixp4xx_readsw(p, v, l)
94 #define readsl(p, v, l) __ixp4xx_readsl(p, v, l)
97 __ixp4xx_writeb(u8 value, volatile void __iomem *p)
100 u32 n, byte_enables, data;
102 if (addr >= VMALLOC_START) {
103 __raw_writeb(value, addr);
108 byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
109 data = value << (8*n);
110 ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
114 __ixp4xx_writesb(volatile void __iomem *bus_addr, const u8 *vaddr, int count)
117 writeb(*vaddr++, bus_addr);
121 __ixp4xx_writew(u16 value, volatile void __iomem *p)
124 u32 n, byte_enables, data;
126 if (addr >= VMALLOC_START) {
127 __raw_writew(value, addr);
132 byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
133 data = value << (8*n);
134 ixp4xx_pci_write(addr, byte_enables | NP_CMD_MEMWRITE, data);
138 __ixp4xx_writesw(volatile void __iomem *bus_addr, const u16 *vaddr, int count)
141 writew(*vaddr++, bus_addr);
145 __ixp4xx_writel(u32 value, volatile void __iomem *p)
148 if (addr >= VMALLOC_START) {
149 __raw_writel(value, addr);
153 ixp4xx_pci_write(addr, NP_CMD_MEMWRITE, value);
157 __ixp4xx_writesl(volatile void __iomem *bus_addr, const u32 *vaddr, int count)
160 writel(*vaddr++, bus_addr);
163 static inline unsigned char
164 __ixp4xx_readb(const volatile void __iomem *p)
167 u32 n, byte_enables, data;
169 if (addr >= VMALLOC_START)
170 return __raw_readb(addr);
173 byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
174 if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
177 return data >> (8*n);
181 __ixp4xx_readsb(const volatile void __iomem *bus_addr, u8 *vaddr, u32 count)
184 *vaddr++ = readb(bus_addr);
187 static inline unsigned short
188 __ixp4xx_readw(const volatile void __iomem *p)
191 u32 n, byte_enables, data;
193 if (addr >= VMALLOC_START)
194 return __raw_readw(addr);
197 byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
198 if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_MEMREAD, &data))
205 __ixp4xx_readsw(const volatile void __iomem *bus_addr, u16 *vaddr, u32 count)
208 *vaddr++ = readw(bus_addr);
211 static inline unsigned long
212 __ixp4xx_readl(const volatile void __iomem *p)
217 if (addr >= VMALLOC_START)
218 return __raw_readl(addr);
220 if (ixp4xx_pci_read(addr, NP_CMD_MEMREAD, &data))
227 __ixp4xx_readsl(const volatile void __iomem *bus_addr, u32 *vaddr, u32 count)
230 *vaddr++ = readl(bus_addr);
235 * We can use the built-in functions b/c they end up calling writeb/readb
237 #define memset_io(c,v,l) _memset_io((c),(v),(l))
238 #define memcpy_fromio(a,c,l) _memcpy_fromio((a),(c),(l))
239 #define memcpy_toio(c,a,l) _memcpy_toio((c),(a),(l))
242 check_signature(const unsigned char __iomem *bus_addr, const unsigned char *signature,
247 if (readb(bus_addr) != *signature)
267 * IXP4xx does not have a transparent cpu -> PCI I/O translation
268 * window. Instead, it has a set of registers that must be tweaked
269 * with the proper byte lanes, command types, and address for the
270 * transaction. This means that we need to override the default
273 #define outb(p, v) __ixp4xx_outb(p, v)
274 #define outw(p, v) __ixp4xx_outw(p, v)
275 #define outl(p, v) __ixp4xx_outl(p, v)
277 #define outsb(p, v, l) __ixp4xx_outsb(p, v, l)
278 #define outsw(p, v, l) __ixp4xx_outsw(p, v, l)
279 #define outsl(p, v, l) __ixp4xx_outsl(p, v, l)
281 #define inb(p) __ixp4xx_inb(p)
282 #define inw(p) __ixp4xx_inw(p)
283 #define inl(p) __ixp4xx_inl(p)
285 #define insb(p, v, l) __ixp4xx_insb(p, v, l)
286 #define insw(p, v, l) __ixp4xx_insw(p, v, l)
287 #define insl(p, v, l) __ixp4xx_insl(p, v, l)
291 __ixp4xx_outb(u8 value, u32 addr)
293 u32 n, byte_enables, data;
295 byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
296 data = value << (8*n);
297 ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
301 __ixp4xx_outsb(u32 io_addr, const u8 *vaddr, u32 count)
304 outb(*vaddr++, io_addr);
308 __ixp4xx_outw(u16 value, u32 addr)
310 u32 n, byte_enables, data;
312 byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
313 data = value << (8*n);
314 ixp4xx_pci_write(addr, byte_enables | NP_CMD_IOWRITE, data);
318 __ixp4xx_outsw(u32 io_addr, const u16 *vaddr, u32 count)
321 outw(cpu_to_le16(*vaddr++), io_addr);
325 __ixp4xx_outl(u32 value, u32 addr)
327 ixp4xx_pci_write(addr, NP_CMD_IOWRITE, value);
331 __ixp4xx_outsl(u32 io_addr, const u32 *vaddr, u32 count)
334 outl(*vaddr++, io_addr);
338 __ixp4xx_inb(u32 addr)
340 u32 n, byte_enables, data;
342 byte_enables = (0xf & ~BIT(n)) << IXP4XX_PCI_NP_CBE_BESL;
343 if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
346 return data >> (8*n);
350 __ixp4xx_insb(u32 io_addr, u8 *vaddr, u32 count)
353 *vaddr++ = inb(io_addr);
357 __ixp4xx_inw(u32 addr)
359 u32 n, byte_enables, data;
361 byte_enables = (0xf & ~(BIT(n) | BIT(n+1))) << IXP4XX_PCI_NP_CBE_BESL;
362 if (ixp4xx_pci_read(addr, byte_enables | NP_CMD_IOREAD, &data))
369 __ixp4xx_insw(u32 io_addr, u16 *vaddr, u32 count)
372 *vaddr++ = le16_to_cpu(inw(io_addr));
376 __ixp4xx_inl(u32 addr)
379 if (ixp4xx_pci_read(addr, NP_CMD_IOREAD, &data))
386 __ixp4xx_insl(u32 io_addr, u32 *vaddr, u32 count)
389 *vaddr++ = inl(io_addr);
392 #define PIO_OFFSET 0x10000UL
393 #define PIO_MASK 0x0ffffUL
395 #define __is_io_address(p) (((unsigned long)p >= PIO_OFFSET) && \
396 ((unsigned long)p <= (PIO_MASK + PIO_OFFSET)))
397 static inline unsigned int
398 __ixp4xx_ioread8(const void __iomem *addr)
400 unsigned long port = (unsigned long __force)addr;
401 if (__is_io_address(port))
402 return (unsigned int)__ixp4xx_inb(port & PIO_MASK);
404 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
405 return (unsigned int)__raw_readb(port);
407 return (unsigned int)__ixp4xx_readb(addr);
412 __ixp4xx_ioread8_rep(const void __iomem *addr, void *vaddr, u32 count)
414 unsigned long port = (unsigned long __force)addr;
415 if (__is_io_address(port))
416 __ixp4xx_insb(port & PIO_MASK, vaddr, count);
418 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
419 __raw_readsb(addr, vaddr, count);
421 __ixp4xx_readsb(addr, vaddr, count);
425 static inline unsigned int
426 __ixp4xx_ioread16(const void __iomem *addr)
428 unsigned long port = (unsigned long __force)addr;
429 if (__is_io_address(port))
430 return (unsigned int)__ixp4xx_inw(port & PIO_MASK);
432 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
433 return le16_to_cpu(__raw_readw((u32)port));
435 return (unsigned int)__ixp4xx_readw(addr);
440 __ixp4xx_ioread16_rep(const void __iomem *addr, void *vaddr, u32 count)
442 unsigned long port = (unsigned long __force)addr;
443 if (__is_io_address(port))
444 __ixp4xx_insw(port & PIO_MASK, vaddr, count);
446 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
447 __raw_readsw(addr, vaddr, count);
449 __ixp4xx_readsw(addr, vaddr, count);
453 static inline unsigned int
454 __ixp4xx_ioread32(const void __iomem *addr)
456 unsigned long port = (unsigned long __force)addr;
457 if (__is_io_address(port))
458 return (unsigned int)__ixp4xx_inl(port & PIO_MASK);
460 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
461 return le32_to_cpu(__raw_readl((u32)port));
463 return (unsigned int)__ixp4xx_readl(addr);
469 __ixp4xx_ioread32_rep(const void __iomem *addr, void *vaddr, u32 count)
471 unsigned long port = (unsigned long __force)addr;
472 if (__is_io_address(port))
473 __ixp4xx_insl(port & PIO_MASK, vaddr, count);
475 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
476 __raw_readsl(addr, vaddr, count);
478 __ixp4xx_readsl(addr, vaddr, count);
483 __ixp4xx_iowrite8(u8 value, void __iomem *addr)
485 unsigned long port = (unsigned long __force)addr;
486 if (__is_io_address(port))
487 __ixp4xx_outb(value, port & PIO_MASK);
489 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
490 __raw_writeb(value, port);
492 __ixp4xx_writeb(value, addr);
497 __ixp4xx_iowrite8_rep(void __iomem *addr, const void *vaddr, u32 count)
499 unsigned long port = (unsigned long __force)addr;
500 if (__is_io_address(port))
501 __ixp4xx_outsb(port & PIO_MASK, vaddr, count);
503 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
504 __raw_writesb(addr, vaddr, count);
506 __ixp4xx_writesb(addr, vaddr, count);
511 __ixp4xx_iowrite16(u16 value, void __iomem *addr)
513 unsigned long port = (unsigned long __force)addr;
514 if (__is_io_address(port))
515 __ixp4xx_outw(value, port & PIO_MASK);
517 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
518 __raw_writew(cpu_to_le16(value), addr);
520 __ixp4xx_writew(value, addr);
525 __ixp4xx_iowrite16_rep(void __iomem *addr, const void *vaddr, u32 count)
527 unsigned long port = (unsigned long __force)addr;
528 if (__is_io_address(port))
529 __ixp4xx_outsw(port & PIO_MASK, vaddr, count);
531 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
532 __raw_writesw(addr, vaddr, count);
534 __ixp4xx_writesw(addr, vaddr, count);
539 __ixp4xx_iowrite32(u32 value, void __iomem *addr)
541 unsigned long port = (unsigned long __force)addr;
542 if (__is_io_address(port))
543 __ixp4xx_outl(value, port & PIO_MASK);
545 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
546 __raw_writel(cpu_to_le32(value), port);
548 __ixp4xx_writel(value, addr);
553 __ixp4xx_iowrite32_rep(void __iomem *addr, const void *vaddr, u32 count)
555 unsigned long port = (unsigned long __force)addr;
556 if (__is_io_address(port))
557 __ixp4xx_outsl(port & PIO_MASK, vaddr, count);
559 #ifndef CONFIG_IXP4XX_INDIRECT_PCI
560 __raw_writesl(addr, vaddr, count);
562 __ixp4xx_writesl(addr, vaddr, count);
566 #define ioread8(p) __ixp4xx_ioread8(p)
567 #define ioread16(p) __ixp4xx_ioread16(p)
568 #define ioread32(p) __ixp4xx_ioread32(p)
570 #define ioread8_rep(p, v, c) __ixp4xx_ioread8_rep(p, v, c)
571 #define ioread16_rep(p, v, c) __ixp4xx_ioread16_rep(p, v, c)
572 #define ioread32_rep(p, v, c) __ixp4xx_ioread32_rep(p, v, c)
574 #define iowrite8(v,p) __ixp4xx_iowrite8(v,p)
575 #define iowrite16(v,p) __ixp4xx_iowrite16(v,p)
576 #define iowrite32(v,p) __ixp4xx_iowrite32(v,p)
578 #define iowrite8_rep(p, v, c) __ixp4xx_iowrite8_rep(p, v, c)
579 #define iowrite16_rep(p, v, c) __ixp4xx_iowrite16_rep(p, v, c)
580 #define iowrite32_rep(p, v, c) __ixp4xx_iowrite32_rep(p, v, c)
582 #define ioport_map(port, nr) ((void __iomem*)(port + PIO_OFFSET))
583 #define ioport_unmap(addr)
584 #endif // !CONFIG_PCI
586 #endif // __ASM_ARM_ARCH_IO_H