6 #include <linux/config.h>
7 #include <linux/kernel.h>
8 #include <asm/compiler.h>
9 #include <asm/system.h>
10 #include <asm/pgtable.h>
11 #include <asm/machvec.h>
12 #include <asm/hwrpb.h>
14 /* The generic header contains only prototypes. Including it ensures that
15 the implementation we have here matches that interface. */
16 #include <asm-generic/iomap.h>
18 /* We don't use IO slowdowns on the Alpha, but.. */
19 #define __SLOW_DOWN_IO do { } while (0)
20 #define SLOW_DOWN_IO do { } while (0)
23 * Virtual -> physical identity mapping starts at this offset
25 #ifdef USE_48_BIT_KSEG
26 #define IDENT_ADDR 0xffff800000000000UL
28 #define IDENT_ADDR 0xfffffc0000000000UL
32 * We try to avoid hae updates (thus the cache), but when we
33 * do need to update the hae, we need to do it atomically, so
34 * that any interrupts wouldn't get confused with the hae
35 * register not being up-to-date with respect to the hardware
38 static inline void __set_hae(unsigned long new_hae)
41 local_irq_save(flags);
43 alpha_mv.hae_cache = new_hae;
44 *alpha_mv.hae_register = new_hae;
46 /* Re-read to make sure it was written. */
47 new_hae = *alpha_mv.hae_register;
49 local_irq_restore(flags);
52 static inline void set_hae(unsigned long new_hae)
54 if (new_hae != alpha_mv.hae_cache)
59 * Change virtual addresses to physical addresses and vv.
61 #ifdef USE_48_BIT_KSEG
62 static inline unsigned long virt_to_phys(void *address)
64 return (unsigned long)address - IDENT_ADDR;
67 static inline void * phys_to_virt(unsigned long address)
69 return (void *) (address + IDENT_ADDR);
72 static inline unsigned long virt_to_phys(void *address)
74 unsigned long phys = (unsigned long)address;
76 /* Sign-extend from bit 41. */
78 phys = (long)phys >> (64 - 41);
80 /* Crop to the physical address width of the processor. */
81 phys &= (1ul << hwrpb->pa_bits) - 1;
86 static inline void * phys_to_virt(unsigned long address)
88 return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1)));
92 #define page_to_phys(page) page_to_pa(page)
94 /* This depends on working iommu. */
95 #define BIO_VMERGE_BOUNDARY (alpha_mv.mv_pci_tbi ? PAGE_SIZE : 0)
97 /* Maximum PIO space address supported? */
98 #define IO_SPACE_LIMIT 0xffff
101 * Change addresses as seen by the kernel (virtual) to addresses as
102 * seen by a device (bus), and vice versa.
104 * Note that this only works for a limited range of kernel addresses,
105 * and very well may not span all memory. Consider this interface
106 * deprecated in favour of the mapping functions in <asm/pci.h>.
108 extern unsigned long __direct_map_base;
109 extern unsigned long __direct_map_size;
111 static inline unsigned long virt_to_bus(void *address)
113 unsigned long phys = virt_to_phys(address);
114 unsigned long bus = phys + __direct_map_base;
115 return phys <= __direct_map_size ? bus : 0;
118 static inline void *bus_to_virt(unsigned long address)
122 /* This check is a sanity check but also ensures that bus address 0
123 maps to virtual address 0 which is useful to detect null pointers
124 (the NCR driver is much simpler if NULL pointers are preserved). */
125 address -= __direct_map_base;
126 virt = phys_to_virt(address);
127 return (long)address <= 0 ? NULL : virt;
131 * There are different chipsets to interface the Alpha CPUs to the world.
134 #define IO_CONCAT(a,b) _IO_CONCAT(a,b)
135 #define _IO_CONCAT(a,b) a ## _ ## b
137 #ifdef CONFIG_ALPHA_GENERIC
139 /* In a generic kernel, we always go through the machine vector. */
141 #define REMAP1(TYPE, NAME, QUAL) \
142 static inline TYPE generic_##NAME(QUAL void __iomem *addr) \
144 return alpha_mv.mv_##NAME(addr); \
147 #define REMAP2(TYPE, NAME, QUAL) \
148 static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \
150 alpha_mv.mv_##NAME(b, addr); \
153 REMAP1(unsigned int, ioread8, /**/)
154 REMAP1(unsigned int, ioread16, /**/)
155 REMAP1(unsigned int, ioread32, /**/)
156 REMAP1(u8, readb, const volatile)
157 REMAP1(u16, readw, const volatile)
158 REMAP1(u32, readl, const volatile)
159 REMAP1(u64, readq, const volatile)
161 REMAP2(u8, iowrite8, /**/)
162 REMAP2(u16, iowrite16, /**/)
163 REMAP2(u32, iowrite32, /**/)
164 REMAP2(u8, writeb, volatile)
165 REMAP2(u16, writew, volatile)
166 REMAP2(u32, writel, volatile)
167 REMAP2(u64, writeq, volatile)
172 static inline void __iomem *generic_ioportmap(unsigned long a)
174 return alpha_mv.mv_ioportmap(a);
177 static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s)
179 return alpha_mv.mv_ioremap(a, s);
182 static inline void generic_iounmap(volatile void __iomem *a)
184 return alpha_mv.mv_iounmap(a);
187 static inline int generic_is_ioaddr(unsigned long a)
189 return alpha_mv.mv_is_ioaddr(a);
192 static inline int generic_is_mmio(const volatile void __iomem *a)
194 return alpha_mv.mv_is_mmio(a);
197 #define __IO_PREFIX generic
198 #define generic_trivial_rw_bw 0
199 #define generic_trivial_rw_lq 0
200 #define generic_trivial_io_bw 0
201 #define generic_trivial_io_lq 0
202 #define generic_trivial_iounmap 0
206 #if defined(CONFIG_ALPHA_APECS)
207 # include <asm/core_apecs.h>
208 #elif defined(CONFIG_ALPHA_CIA)
209 # include <asm/core_cia.h>
210 #elif defined(CONFIG_ALPHA_IRONGATE)
211 # include <asm/core_irongate.h>
212 #elif defined(CONFIG_ALPHA_JENSEN)
213 # include <asm/jensen.h>
214 #elif defined(CONFIG_ALPHA_LCA)
215 # include <asm/core_lca.h>
216 #elif defined(CONFIG_ALPHA_MARVEL)
217 # include <asm/core_marvel.h>
218 #elif defined(CONFIG_ALPHA_MCPCIA)
219 # include <asm/core_mcpcia.h>
220 #elif defined(CONFIG_ALPHA_POLARIS)
221 # include <asm/core_polaris.h>
222 #elif defined(CONFIG_ALPHA_T2)
223 # include <asm/core_t2.h>
224 #elif defined(CONFIG_ALPHA_TSUNAMI)
225 # include <asm/core_tsunami.h>
226 #elif defined(CONFIG_ALPHA_TITAN)
227 # include <asm/core_titan.h>
228 #elif defined(CONFIG_ALPHA_WILDFIRE)
229 # include <asm/core_wildfire.h>
231 #error "What system is this?"
237 * We always have external versions of these routines.
239 extern u8 inb(unsigned long port);
240 extern u16 inw(unsigned long port);
241 extern u32 inl(unsigned long port);
242 extern void outb(u8 b, unsigned long port);
243 extern void outw(u16 b, unsigned long port);
244 extern void outl(u32 b, unsigned long port);
246 extern u8 readb(const volatile void __iomem *addr);
247 extern u16 readw(const volatile void __iomem *addr);
248 extern u32 readl(const volatile void __iomem *addr);
249 extern u64 readq(const volatile void __iomem *addr);
250 extern void writeb(u8 b, volatile void __iomem *addr);
251 extern void writew(u16 b, volatile void __iomem *addr);
252 extern void writel(u32 b, volatile void __iomem *addr);
253 extern void writeq(u64 b, volatile void __iomem *addr);
255 extern u8 __raw_readb(const volatile void __iomem *addr);
256 extern u16 __raw_readw(const volatile void __iomem *addr);
257 extern u32 __raw_readl(const volatile void __iomem *addr);
258 extern u64 __raw_readq(const volatile void __iomem *addr);
259 extern void __raw_writeb(u8 b, volatile void __iomem *addr);
260 extern void __raw_writew(u16 b, volatile void __iomem *addr);
261 extern void __raw_writel(u32 b, volatile void __iomem *addr);
262 extern void __raw_writeq(u64 b, volatile void __iomem *addr);
265 * Mapping from port numbers to __iomem space is pretty easy.
268 /* These two have to be extern inline because of the extern prototype from
269 <asm-generic/iomap.h>. It is not legal to mix "extern" and "static" for
270 the same declaration. */
271 extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
273 return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
276 extern inline void ioport_unmap(void __iomem *addr)
280 static inline void __iomem *ioremap(unsigned long port, unsigned long size)
282 return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
285 static inline void __iomem * ioremap_nocache(unsigned long offset,
288 return ioremap(offset, size);
291 static inline void iounmap(volatile void __iomem *addr)
293 IO_CONCAT(__IO_PREFIX,iounmap)(addr);
296 static inline int __is_ioaddr(unsigned long addr)
298 return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
300 #define __is_ioaddr(a) __is_ioaddr((unsigned long)(a))
302 static inline int __is_mmio(const volatile void __iomem *addr)
304 return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
309 * If the actual I/O bits are sufficiently trivial, then expand inline.
312 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
313 extern inline unsigned int ioread8(void __iomem *addr)
315 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
320 extern inline unsigned int ioread16(void __iomem *addr)
322 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
327 extern inline void iowrite8(u8 b, void __iomem *addr)
329 IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
333 extern inline void iowrite16(u16 b, void __iomem *addr)
335 IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
339 extern inline u8 inb(unsigned long port)
341 return ioread8(ioport_map(port, 1));
344 extern inline u16 inw(unsigned long port)
346 return ioread16(ioport_map(port, 2));
349 extern inline void outb(u8 b, unsigned long port)
351 iowrite8(b, ioport_map(port, 1));
354 extern inline void outw(u16 b, unsigned long port)
356 iowrite16(b, ioport_map(port, 2));
360 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
361 extern inline unsigned int ioread32(void __iomem *addr)
363 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
368 extern inline void iowrite32(u32 b, void __iomem *addr)
370 IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
374 extern inline u32 inl(unsigned long port)
376 return ioread32(ioport_map(port, 4));
379 extern inline void outl(u32 b, unsigned long port)
381 iowrite32(b, ioport_map(port, 4));
385 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
386 extern inline u8 __raw_readb(const volatile void __iomem *addr)
388 return IO_CONCAT(__IO_PREFIX,readb)(addr);
391 extern inline u16 __raw_readw(const volatile void __iomem *addr)
393 return IO_CONCAT(__IO_PREFIX,readw)(addr);
396 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
398 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
401 extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
403 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
406 extern inline u8 readb(const volatile void __iomem *addr)
408 u8 ret = __raw_readb(addr);
413 extern inline u16 readw(const volatile void __iomem *addr)
415 u16 ret = __raw_readw(addr);
420 extern inline void writeb(u8 b, volatile void __iomem *addr)
422 __raw_writeb(b, addr);
426 extern inline void writew(u16 b, volatile void __iomem *addr)
428 __raw_writew(b, addr);
433 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
434 extern inline u32 __raw_readl(const volatile void __iomem *addr)
436 return IO_CONCAT(__IO_PREFIX,readl)(addr);
439 extern inline u64 __raw_readq(const volatile void __iomem *addr)
441 return IO_CONCAT(__IO_PREFIX,readq)(addr);
444 extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
446 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
449 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
451 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
454 extern inline u32 readl(const volatile void __iomem *addr)
456 u32 ret = __raw_readl(addr);
461 extern inline u64 readq(const volatile void __iomem *addr)
463 u64 ret = __raw_readq(addr);
468 extern inline void writel(u32 b, volatile void __iomem *addr)
470 __raw_writel(b, addr);
474 extern inline void writeq(u64 b, volatile void __iomem *addr)
476 __raw_writeq(b, addr);
487 #define readb_relaxed(addr) __raw_readb(addr)
488 #define readw_relaxed(addr) __raw_readw(addr)
489 #define readl_relaxed(addr) __raw_readl(addr)
490 #define readq_relaxed(addr) __raw_readq(addr)
493 * String version of IO memory access ops:
495 extern void memcpy_fromio(void *, const volatile void __iomem *, long);
496 extern void memcpy_toio(volatile void __iomem *, const void *, long);
497 extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
499 static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
501 _memset_c_io(addr, 0x0101010101010101UL * c, len);
504 #define __HAVE_ARCH_MEMSETW_IO
505 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
507 _memset_c_io(addr, 0x0001000100010001UL * c, len);
511 * String versions of in/out ops:
513 extern void insb (unsigned long port, void *dst, unsigned long count);
514 extern void insw (unsigned long port, void *dst, unsigned long count);
515 extern void insl (unsigned long port, void *dst, unsigned long count);
516 extern void outsb (unsigned long port, const void *src, unsigned long count);
517 extern void outsw (unsigned long port, const void *src, unsigned long count);
518 extern void outsl (unsigned long port, const void *src, unsigned long count);
521 * XXX - We don't have csum_partial_copy_fromio() yet, so we cheat here and
522 * just copy it. The net code will then do the checksum later. Presently
523 * only used by some shared memory 8390 Ethernet cards anyway.
526 #define eth_io_copy_and_sum(skb,src,len,unused) \
527 memcpy_fromio((skb)->data,src,len)
529 #define isa_eth_io_copy_and_sum(skb,src,len,unused) \
530 isa_memcpy_fromio((skb)->data,src,len)
533 check_signature(const volatile void __iomem *io_addr,
534 const unsigned char *signature, int length)
537 if (readb(io_addr) != *signature)
547 * ISA space is mapped to some machine-specific location on Alpha.
548 * Call into the existing hooks to get the address translated.
552 isa_readb(unsigned long offset)
554 void __iomem *addr = ioremap(offset, 1);
555 u8 ret = readb(addr);
561 isa_readw(unsigned long offset)
563 void __iomem *addr = ioremap(offset, 2);
564 u16 ret = readw(addr);
570 isa_readl(unsigned long offset)
572 void __iomem *addr = ioremap(offset, 2);
573 u32 ret = readl(addr);
579 isa_writeb(u8 b, unsigned long offset)
581 void __iomem *addr = ioremap(offset, 2);
587 isa_writew(u16 w, unsigned long offset)
589 void __iomem *addr = ioremap(offset, 2);
595 isa_writel(u32 l, unsigned long offset)
597 void __iomem *addr = ioremap(offset, 2);
603 isa_memset_io(unsigned long offset, u8 val, long n)
605 void __iomem *addr = ioremap(offset, n);
606 memset_io(addr, val, n);
611 isa_memcpy_fromio(void *dest, unsigned long offset, long n)
613 void __iomem *addr = ioremap(offset, n);
614 memcpy_fromio(dest, addr, n);
619 isa_memcpy_toio(unsigned long offset, const void *src, long n)
621 void __iomem *addr = ioremap(offset, n);
622 memcpy_toio(addr, src, n);
627 isa_check_signature(unsigned long offset, const unsigned char *sig, long len)
629 void __iomem *addr = ioremap(offset, len);
630 int ret = check_signature(addr, sig, len);
637 * The Alpha Jensen hardware for some rather strange reason puts
638 * the RTC clock at 0x170 instead of 0x70. Probably due to some
639 * misguided idea about using 0x70 for NMI stuff.
641 * These defines will override the defaults when doing RTC queries
644 #ifdef CONFIG_ALPHA_GENERIC
645 # define RTC_PORT(x) ((x) + alpha_mv.rtc_port)
647 # ifdef CONFIG_ALPHA_JENSEN
648 # define RTC_PORT(x) (0x170+(x))
650 # define RTC_PORT(x) (0x70 + (x))
653 #define RTC_ALWAYS_BCD 0
657 #define dma_cache_inv(_start,_size) do { } while (0)
658 #define dma_cache_wback(_start,_size) do { } while (0)
659 #define dma_cache_wback_inv(_start,_size) do { } while (0)
661 #endif /* __KERNEL__ */
663 #endif /* __ALPHA_IO_H */