6 #include <linux/kernel.h>
7 #include <asm/compiler.h>
8 #include <asm/system.h>
9 #include <asm/pgtable.h>
10 #include <asm/machvec.h>
11 #include <asm/hwrpb.h>
13 /* The generic header contains only prototypes. Including it ensures that
14 the implementation we have here matches that interface. */
15 #include <asm-generic/iomap.h>
17 /* We don't use IO slowdowns on the Alpha, but.. */
18 #define __SLOW_DOWN_IO do { } while (0)
19 #define SLOW_DOWN_IO do { } while (0)
22 * Virtual -> physical identity mapping starts at this offset
24 #ifdef USE_48_BIT_KSEG
25 #define IDENT_ADDR 0xffff800000000000UL
27 #define IDENT_ADDR 0xfffffc0000000000UL
31 * We try to avoid hae updates (thus the cache), but when we
32 * do need to update the hae, we need to do it atomically, so
33 * that any interrupts wouldn't get confused with the hae
34 * register not being up-to-date with respect to the hardware
37 static inline void __set_hae(unsigned long new_hae)
40 local_irq_save(flags);
42 alpha_mv.hae_cache = new_hae;
43 *alpha_mv.hae_register = new_hae;
45 /* Re-read to make sure it was written. */
46 new_hae = *alpha_mv.hae_register;
48 local_irq_restore(flags);
51 static inline void set_hae(unsigned long new_hae)
53 if (new_hae != alpha_mv.hae_cache)
58 * Change virtual addresses to physical addresses and vv.
60 #ifdef USE_48_BIT_KSEG
61 static inline unsigned long virt_to_phys(void *address)
63 return (unsigned long)address - IDENT_ADDR;
66 static inline void * phys_to_virt(unsigned long address)
68 return (void *) (address + IDENT_ADDR);
71 static inline unsigned long virt_to_phys(void *address)
73 unsigned long phys = (unsigned long)address;
75 /* Sign-extend from bit 41. */
77 phys = (long)phys >> (64 - 41);
79 /* Crop to the physical address width of the processor. */
80 phys &= (1ul << hwrpb->pa_bits) - 1;
85 static inline void * phys_to_virt(unsigned long address)
87 return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1)));
91 #define page_to_phys(page) page_to_pa(page)
93 /* This depends on working iommu. */
94 #define BIO_VMERGE_BOUNDARY (alpha_mv.mv_pci_tbi ? PAGE_SIZE : 0)
96 /* Maximum PIO space address supported? */
97 #define IO_SPACE_LIMIT 0xffff
100 * Change addresses as seen by the kernel (virtual) to addresses as
101 * seen by a device (bus), and vice versa.
103 * Note that this only works for a limited range of kernel addresses,
104 * and very well may not span all memory. Consider this interface
105 * deprecated in favour of the mapping functions in <asm/pci.h>.
107 extern unsigned long __direct_map_base;
108 extern unsigned long __direct_map_size;
110 static inline unsigned long virt_to_bus(void *address)
112 unsigned long phys = virt_to_phys(address);
113 unsigned long bus = phys + __direct_map_base;
114 return phys <= __direct_map_size ? bus : 0;
117 static inline void *bus_to_virt(unsigned long address)
121 /* This check is a sanity check but also ensures that bus address 0
122 maps to virtual address 0 which is useful to detect null pointers
123 (the NCR driver is much simpler if NULL pointers are preserved). */
124 address -= __direct_map_base;
125 virt = phys_to_virt(address);
126 return (long)address <= 0 ? NULL : virt;
130 * There are different chipsets to interface the Alpha CPUs to the world.
133 #define IO_CONCAT(a,b) _IO_CONCAT(a,b)
134 #define _IO_CONCAT(a,b) a ## _ ## b
136 #ifdef CONFIG_ALPHA_GENERIC
138 /* In a generic kernel, we always go through the machine vector. */
140 #define REMAP1(TYPE, NAME, QUAL) \
141 static inline TYPE generic_##NAME(QUAL void __iomem *addr) \
143 return alpha_mv.mv_##NAME(addr); \
146 #define REMAP2(TYPE, NAME, QUAL) \
147 static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \
149 alpha_mv.mv_##NAME(b, addr); \
152 REMAP1(unsigned int, ioread8, /**/)
153 REMAP1(unsigned int, ioread16, /**/)
154 REMAP1(unsigned int, ioread32, /**/)
155 REMAP1(u8, readb, const volatile)
156 REMAP1(u16, readw, const volatile)
157 REMAP1(u32, readl, const volatile)
158 REMAP1(u64, readq, const volatile)
160 REMAP2(u8, iowrite8, /**/)
161 REMAP2(u16, iowrite16, /**/)
162 REMAP2(u32, iowrite32, /**/)
163 REMAP2(u8, writeb, volatile)
164 REMAP2(u16, writew, volatile)
165 REMAP2(u32, writel, volatile)
166 REMAP2(u64, writeq, volatile)
171 static inline void __iomem *generic_ioportmap(unsigned long a)
173 return alpha_mv.mv_ioportmap(a);
176 static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s)
178 return alpha_mv.mv_ioremap(a, s);
181 static inline void generic_iounmap(volatile void __iomem *a)
183 return alpha_mv.mv_iounmap(a);
186 static inline int generic_is_ioaddr(unsigned long a)
188 return alpha_mv.mv_is_ioaddr(a);
191 static inline int generic_is_mmio(const volatile void __iomem *a)
193 return alpha_mv.mv_is_mmio(a);
196 #define __IO_PREFIX generic
197 #define generic_trivial_rw_bw 0
198 #define generic_trivial_rw_lq 0
199 #define generic_trivial_io_bw 0
200 #define generic_trivial_io_lq 0
201 #define generic_trivial_iounmap 0
205 #if defined(CONFIG_ALPHA_APECS)
206 # include <asm/core_apecs.h>
207 #elif defined(CONFIG_ALPHA_CIA)
208 # include <asm/core_cia.h>
209 #elif defined(CONFIG_ALPHA_IRONGATE)
210 # include <asm/core_irongate.h>
211 #elif defined(CONFIG_ALPHA_JENSEN)
212 # include <asm/jensen.h>
213 #elif defined(CONFIG_ALPHA_LCA)
214 # include <asm/core_lca.h>
215 #elif defined(CONFIG_ALPHA_MARVEL)
216 # include <asm/core_marvel.h>
217 #elif defined(CONFIG_ALPHA_MCPCIA)
218 # include <asm/core_mcpcia.h>
219 #elif defined(CONFIG_ALPHA_POLARIS)
220 # include <asm/core_polaris.h>
221 #elif defined(CONFIG_ALPHA_T2)
222 # include <asm/core_t2.h>
223 #elif defined(CONFIG_ALPHA_TSUNAMI)
224 # include <asm/core_tsunami.h>
225 #elif defined(CONFIG_ALPHA_TITAN)
226 # include <asm/core_titan.h>
227 #elif defined(CONFIG_ALPHA_WILDFIRE)
228 # include <asm/core_wildfire.h>
230 #error "What system is this?"
236 * We always have external versions of these routines.
238 extern u8 inb(unsigned long port);
239 extern u16 inw(unsigned long port);
240 extern u32 inl(unsigned long port);
241 extern void outb(u8 b, unsigned long port);
242 extern void outw(u16 b, unsigned long port);
243 extern void outl(u32 b, unsigned long port);
245 extern u8 readb(const volatile void __iomem *addr);
246 extern u16 readw(const volatile void __iomem *addr);
247 extern u32 readl(const volatile void __iomem *addr);
248 extern u64 readq(const volatile void __iomem *addr);
249 extern void writeb(u8 b, volatile void __iomem *addr);
250 extern void writew(u16 b, volatile void __iomem *addr);
251 extern void writel(u32 b, volatile void __iomem *addr);
252 extern void writeq(u64 b, volatile void __iomem *addr);
254 extern u8 __raw_readb(const volatile void __iomem *addr);
255 extern u16 __raw_readw(const volatile void __iomem *addr);
256 extern u32 __raw_readl(const volatile void __iomem *addr);
257 extern u64 __raw_readq(const volatile void __iomem *addr);
258 extern void __raw_writeb(u8 b, volatile void __iomem *addr);
259 extern void __raw_writew(u16 b, volatile void __iomem *addr);
260 extern void __raw_writel(u32 b, volatile void __iomem *addr);
261 extern void __raw_writeq(u64 b, volatile void __iomem *addr);
264 * Mapping from port numbers to __iomem space is pretty easy.
267 /* These two have to be extern inline because of the extern prototype from
268 <asm-generic/iomap.h>. It is not legal to mix "extern" and "static" for
269 the same declaration. */
270 extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
272 return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
275 extern inline void ioport_unmap(void __iomem *addr)
279 static inline void __iomem *ioremap(unsigned long port, unsigned long size)
281 return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
284 static inline void __iomem *__ioremap(unsigned long port, unsigned long size,
287 return ioremap(port, size);
290 static inline void __iomem * ioremap_nocache(unsigned long offset,
293 return ioremap(offset, size);
296 static inline void iounmap(volatile void __iomem *addr)
298 IO_CONCAT(__IO_PREFIX,iounmap)(addr);
301 static inline int __is_ioaddr(unsigned long addr)
303 return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
305 #define __is_ioaddr(a) __is_ioaddr((unsigned long)(a))
307 static inline int __is_mmio(const volatile void __iomem *addr)
309 return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
314 * If the actual I/O bits are sufficiently trivial, then expand inline.
317 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
318 extern inline unsigned int ioread8(void __iomem *addr)
320 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
325 extern inline unsigned int ioread16(void __iomem *addr)
327 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
332 extern inline void iowrite8(u8 b, void __iomem *addr)
334 IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
338 extern inline void iowrite16(u16 b, void __iomem *addr)
340 IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
344 extern inline u8 inb(unsigned long port)
346 return ioread8(ioport_map(port, 1));
349 extern inline u16 inw(unsigned long port)
351 return ioread16(ioport_map(port, 2));
354 extern inline void outb(u8 b, unsigned long port)
356 iowrite8(b, ioport_map(port, 1));
359 extern inline void outw(u16 b, unsigned long port)
361 iowrite16(b, ioport_map(port, 2));
365 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
366 extern inline unsigned int ioread32(void __iomem *addr)
368 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
373 extern inline void iowrite32(u32 b, void __iomem *addr)
375 IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
379 extern inline u32 inl(unsigned long port)
381 return ioread32(ioport_map(port, 4));
384 extern inline void outl(u32 b, unsigned long port)
386 iowrite32(b, ioport_map(port, 4));
390 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
391 extern inline u8 __raw_readb(const volatile void __iomem *addr)
393 return IO_CONCAT(__IO_PREFIX,readb)(addr);
396 extern inline u16 __raw_readw(const volatile void __iomem *addr)
398 return IO_CONCAT(__IO_PREFIX,readw)(addr);
401 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
403 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
406 extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
408 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
411 extern inline u8 readb(const volatile void __iomem *addr)
413 u8 ret = __raw_readb(addr);
418 extern inline u16 readw(const volatile void __iomem *addr)
420 u16 ret = __raw_readw(addr);
425 extern inline void writeb(u8 b, volatile void __iomem *addr)
427 __raw_writeb(b, addr);
431 extern inline void writew(u16 b, volatile void __iomem *addr)
433 __raw_writew(b, addr);
438 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
439 extern inline u32 __raw_readl(const volatile void __iomem *addr)
441 return IO_CONCAT(__IO_PREFIX,readl)(addr);
444 extern inline u64 __raw_readq(const volatile void __iomem *addr)
446 return IO_CONCAT(__IO_PREFIX,readq)(addr);
449 extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
451 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
454 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
456 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
459 extern inline u32 readl(const volatile void __iomem *addr)
461 u32 ret = __raw_readl(addr);
466 extern inline u64 readq(const volatile void __iomem *addr)
468 u64 ret = __raw_readq(addr);
473 extern inline void writel(u32 b, volatile void __iomem *addr)
475 __raw_writel(b, addr);
479 extern inline void writeq(u64 b, volatile void __iomem *addr)
481 __raw_writeq(b, addr);
492 #define readb_relaxed(addr) __raw_readb(addr)
493 #define readw_relaxed(addr) __raw_readw(addr)
494 #define readl_relaxed(addr) __raw_readl(addr)
495 #define readq_relaxed(addr) __raw_readq(addr)
500 * String version of IO memory access ops:
502 extern void memcpy_fromio(void *, const volatile void __iomem *, long);
503 extern void memcpy_toio(volatile void __iomem *, const void *, long);
504 extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
506 static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
508 _memset_c_io(addr, 0x0101010101010101UL * c, len);
511 #define __HAVE_ARCH_MEMSETW_IO
512 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
514 _memset_c_io(addr, 0x0001000100010001UL * c, len);
518 * String versions of in/out ops:
520 extern void insb (unsigned long port, void *dst, unsigned long count);
521 extern void insw (unsigned long port, void *dst, unsigned long count);
522 extern void insl (unsigned long port, void *dst, unsigned long count);
523 extern void outsb (unsigned long port, const void *src, unsigned long count);
524 extern void outsw (unsigned long port, const void *src, unsigned long count);
525 extern void outsl (unsigned long port, const void *src, unsigned long count);
528 * XXX - We don't have csum_partial_copy_fromio() yet, so we cheat here and
529 * just copy it. The net code will then do the checksum later. Presently
530 * only used by some shared memory 8390 Ethernet cards anyway.
533 #define eth_io_copy_and_sum(skb,src,len,unused) \
534 memcpy_fromio((skb)->data,src,len)
537 check_signature(const volatile void __iomem *io_addr,
538 const unsigned char *signature, int length)
541 if (readb(io_addr) != *signature)
550 * The Alpha Jensen hardware for some rather strange reason puts
551 * the RTC clock at 0x170 instead of 0x70. Probably due to some
552 * misguided idea about using 0x70 for NMI stuff.
554 * These defines will override the defaults when doing RTC queries
557 #ifdef CONFIG_ALPHA_GENERIC
558 # define RTC_PORT(x) ((x) + alpha_mv.rtc_port)
560 # ifdef CONFIG_ALPHA_JENSEN
561 # define RTC_PORT(x) (0x170+(x))
563 # define RTC_PORT(x) (0x70 + (x))
566 #define RTC_ALWAYS_BCD 0
570 #define dma_cache_inv(_start,_size) do { } while (0)
571 #define dma_cache_wback(_start,_size) do { } while (0)
572 #define dma_cache_wback_inv(_start,_size) do { } while (0)
575 * Some mucking forons use if[n]def writeq to check if platform has it.
576 * It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
577 * to play with; for now just use cpp anti-recursion logics and make sure
578 * that damn thing is defined and expands to itself.
581 #define writeq writeq
585 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
588 #define xlate_dev_mem_ptr(p) __va(p)
591 * Convert a virtual cached pointer to an uncached pointer
593 #define xlate_dev_kmem_ptr(p) p
595 #endif /* __KERNEL__ */
597 #endif /* __ALPHA_IO_H */