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;
116 #define isa_virt_to_bus virt_to_bus
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(unsigned long port, unsigned long size,
288 return ioremap(port, size);
291 static inline void __iomem * ioremap_nocache(unsigned long offset,
294 return ioremap(offset, size);
297 static inline void iounmap(volatile void __iomem *addr)
299 IO_CONCAT(__IO_PREFIX,iounmap)(addr);
302 static inline int __is_ioaddr(unsigned long addr)
304 return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
306 #define __is_ioaddr(a) __is_ioaddr((unsigned long)(a))
308 static inline int __is_mmio(const volatile void __iomem *addr)
310 return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
315 * If the actual I/O bits are sufficiently trivial, then expand inline.
318 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
319 extern inline unsigned int ioread8(void __iomem *addr)
321 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
326 extern inline unsigned int ioread16(void __iomem *addr)
328 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
333 extern inline void iowrite8(u8 b, void __iomem *addr)
335 IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
339 extern inline void iowrite16(u16 b, void __iomem *addr)
341 IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
345 extern inline u8 inb(unsigned long port)
347 return ioread8(ioport_map(port, 1));
350 extern inline u16 inw(unsigned long port)
352 return ioread16(ioport_map(port, 2));
355 extern inline void outb(u8 b, unsigned long port)
357 iowrite8(b, ioport_map(port, 1));
360 extern inline void outw(u16 b, unsigned long port)
362 iowrite16(b, ioport_map(port, 2));
366 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
367 extern inline unsigned int ioread32(void __iomem *addr)
369 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
374 extern inline void iowrite32(u32 b, void __iomem *addr)
376 IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
380 extern inline u32 inl(unsigned long port)
382 return ioread32(ioport_map(port, 4));
385 extern inline void outl(u32 b, unsigned long port)
387 iowrite32(b, ioport_map(port, 4));
391 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
392 extern inline u8 __raw_readb(const volatile void __iomem *addr)
394 return IO_CONCAT(__IO_PREFIX,readb)(addr);
397 extern inline u16 __raw_readw(const volatile void __iomem *addr)
399 return IO_CONCAT(__IO_PREFIX,readw)(addr);
402 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
404 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
407 extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
409 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
412 extern inline u8 readb(const volatile void __iomem *addr)
414 u8 ret = __raw_readb(addr);
419 extern inline u16 readw(const volatile void __iomem *addr)
421 u16 ret = __raw_readw(addr);
426 extern inline void writeb(u8 b, volatile void __iomem *addr)
428 __raw_writeb(b, addr);
432 extern inline void writew(u16 b, volatile void __iomem *addr)
434 __raw_writew(b, addr);
439 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
440 extern inline u32 __raw_readl(const volatile void __iomem *addr)
442 return IO_CONCAT(__IO_PREFIX,readl)(addr);
445 extern inline u64 __raw_readq(const volatile void __iomem *addr)
447 return IO_CONCAT(__IO_PREFIX,readq)(addr);
450 extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
452 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
455 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
457 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
460 extern inline u32 readl(const volatile void __iomem *addr)
462 u32 ret = __raw_readl(addr);
467 extern inline u64 readq(const volatile void __iomem *addr)
469 u64 ret = __raw_readq(addr);
474 extern inline void writel(u32 b, volatile void __iomem *addr)
476 __raw_writel(b, addr);
480 extern inline void writeq(u64 b, volatile void __iomem *addr)
482 __raw_writeq(b, addr);
493 #define readb_relaxed(addr) __raw_readb(addr)
494 #define readw_relaxed(addr) __raw_readw(addr)
495 #define readl_relaxed(addr) __raw_readl(addr)
496 #define readq_relaxed(addr) __raw_readq(addr)
501 * String version of IO memory access ops:
503 extern void memcpy_fromio(void *, const volatile void __iomem *, long);
504 extern void memcpy_toio(volatile void __iomem *, const void *, long);
505 extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
507 static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
509 _memset_c_io(addr, 0x0101010101010101UL * c, len);
512 #define __HAVE_ARCH_MEMSETW_IO
513 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
515 _memset_c_io(addr, 0x0001000100010001UL * c, len);
519 * String versions of in/out ops:
521 extern void insb (unsigned long port, void *dst, unsigned long count);
522 extern void insw (unsigned long port, void *dst, unsigned long count);
523 extern void insl (unsigned long port, void *dst, unsigned long count);
524 extern void outsb (unsigned long port, const void *src, unsigned long count);
525 extern void outsw (unsigned long port, const void *src, unsigned long count);
526 extern void outsl (unsigned long port, const void *src, unsigned long count);
529 * The Alpha Jensen hardware for some rather strange reason puts
530 * the RTC clock at 0x170 instead of 0x70. Probably due to some
531 * misguided idea about using 0x70 for NMI stuff.
533 * These defines will override the defaults when doing RTC queries
536 #ifdef CONFIG_ALPHA_GENERIC
537 # define RTC_PORT(x) ((x) + alpha_mv.rtc_port)
539 # ifdef CONFIG_ALPHA_JENSEN
540 # define RTC_PORT(x) (0x170+(x))
542 # define RTC_PORT(x) (0x70 + (x))
545 #define RTC_ALWAYS_BCD 0
549 #define dma_cache_inv(_start,_size) do { } while (0)
550 #define dma_cache_wback(_start,_size) do { } while (0)
551 #define dma_cache_wback_inv(_start,_size) do { } while (0)
554 * Some mucking forons use if[n]def writeq to check if platform has it.
555 * It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
556 * to play with; for now just use cpp anti-recursion logics and make sure
557 * that damn thing is defined and expands to itself.
560 #define writeq writeq
564 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
567 #define xlate_dev_mem_ptr(p) __va(p)
570 * Convert a virtual cached pointer to an uncached pointer
572 #define xlate_dev_kmem_ptr(p) p
574 #endif /* __KERNEL__ */
576 #endif /* __ALPHA_IO_H */