6 #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 extern 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 extern 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 static inline dma_addr_t __deprecated isa_page_to_bus(struct page *page)
96 return page_to_phys(page);
99 /* Maximum PIO space address supported? */
100 #define IO_SPACE_LIMIT 0xffff
103 * Change addresses as seen by the kernel (virtual) to addresses as
104 * seen by a device (bus), and vice versa.
106 * Note that this only works for a limited range of kernel addresses,
107 * and very well may not span all memory. Consider this interface
108 * deprecated in favour of the DMA-mapping API.
110 extern unsigned long __direct_map_base;
111 extern unsigned long __direct_map_size;
113 static inline unsigned long __deprecated virt_to_bus(void *address)
115 unsigned long phys = virt_to_phys(address);
116 unsigned long bus = phys + __direct_map_base;
117 return phys <= __direct_map_size ? bus : 0;
119 #define isa_virt_to_bus virt_to_bus
121 static inline void * __deprecated bus_to_virt(unsigned long address)
125 /* This check is a sanity check but also ensures that bus address 0
126 maps to virtual address 0 which is useful to detect null pointers
127 (the NCR driver is much simpler if NULL pointers are preserved). */
128 address -= __direct_map_base;
129 virt = phys_to_virt(address);
130 return (long)address <= 0 ? NULL : virt;
132 #define isa_bus_to_virt bus_to_virt
135 * There are different chipsets to interface the Alpha CPUs to the world.
138 #define IO_CONCAT(a,b) _IO_CONCAT(a,b)
139 #define _IO_CONCAT(a,b) a ## _ ## b
141 #ifdef CONFIG_ALPHA_GENERIC
143 /* In a generic kernel, we always go through the machine vector. */
145 #define REMAP1(TYPE, NAME, QUAL) \
146 static inline TYPE generic_##NAME(QUAL void __iomem *addr) \
148 return alpha_mv.mv_##NAME(addr); \
151 #define REMAP2(TYPE, NAME, QUAL) \
152 static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \
154 alpha_mv.mv_##NAME(b, addr); \
157 REMAP1(unsigned int, ioread8, /**/)
158 REMAP1(unsigned int, ioread16, /**/)
159 REMAP1(unsigned int, ioread32, /**/)
160 REMAP1(u8, readb, const volatile)
161 REMAP1(u16, readw, const volatile)
162 REMAP1(u32, readl, const volatile)
163 REMAP1(u64, readq, const volatile)
165 REMAP2(u8, iowrite8, /**/)
166 REMAP2(u16, iowrite16, /**/)
167 REMAP2(u32, iowrite32, /**/)
168 REMAP2(u8, writeb, volatile)
169 REMAP2(u16, writew, volatile)
170 REMAP2(u32, writel, volatile)
171 REMAP2(u64, writeq, volatile)
176 extern inline void __iomem *generic_ioportmap(unsigned long a)
178 return alpha_mv.mv_ioportmap(a);
181 static inline void __iomem *generic_ioremap(unsigned long a, unsigned long s)
183 return alpha_mv.mv_ioremap(a, s);
186 static inline void generic_iounmap(volatile void __iomem *a)
188 return alpha_mv.mv_iounmap(a);
191 static inline int generic_is_ioaddr(unsigned long a)
193 return alpha_mv.mv_is_ioaddr(a);
196 static inline int generic_is_mmio(const volatile void __iomem *a)
198 return alpha_mv.mv_is_mmio(a);
201 #define __IO_PREFIX generic
202 #define generic_trivial_rw_bw 0
203 #define generic_trivial_rw_lq 0
204 #define generic_trivial_io_bw 0
205 #define generic_trivial_io_lq 0
206 #define generic_trivial_iounmap 0
210 #if defined(CONFIG_ALPHA_APECS)
211 # include <asm/core_apecs.h>
212 #elif defined(CONFIG_ALPHA_CIA)
213 # include <asm/core_cia.h>
214 #elif defined(CONFIG_ALPHA_IRONGATE)
215 # include <asm/core_irongate.h>
216 #elif defined(CONFIG_ALPHA_JENSEN)
217 # include <asm/jensen.h>
218 #elif defined(CONFIG_ALPHA_LCA)
219 # include <asm/core_lca.h>
220 #elif defined(CONFIG_ALPHA_MARVEL)
221 # include <asm/core_marvel.h>
222 #elif defined(CONFIG_ALPHA_MCPCIA)
223 # include <asm/core_mcpcia.h>
224 #elif defined(CONFIG_ALPHA_POLARIS)
225 # include <asm/core_polaris.h>
226 #elif defined(CONFIG_ALPHA_T2)
227 # include <asm/core_t2.h>
228 #elif defined(CONFIG_ALPHA_TSUNAMI)
229 # include <asm/core_tsunami.h>
230 #elif defined(CONFIG_ALPHA_TITAN)
231 # include <asm/core_titan.h>
232 #elif defined(CONFIG_ALPHA_WILDFIRE)
233 # include <asm/core_wildfire.h>
235 #error "What system is this?"
241 * We always have external versions of these routines.
243 extern u8 inb(unsigned long port);
244 extern u16 inw(unsigned long port);
245 extern u32 inl(unsigned long port);
246 extern void outb(u8 b, unsigned long port);
247 extern void outw(u16 b, unsigned long port);
248 extern void outl(u32 b, unsigned long port);
250 extern u8 readb(const volatile void __iomem *addr);
251 extern u16 readw(const volatile void __iomem *addr);
252 extern u32 readl(const volatile void __iomem *addr);
253 extern u64 readq(const volatile void __iomem *addr);
254 extern void writeb(u8 b, volatile void __iomem *addr);
255 extern void writew(u16 b, volatile void __iomem *addr);
256 extern void writel(u32 b, volatile void __iomem *addr);
257 extern void writeq(u64 b, volatile void __iomem *addr);
259 extern u8 __raw_readb(const volatile void __iomem *addr);
260 extern u16 __raw_readw(const volatile void __iomem *addr);
261 extern u32 __raw_readl(const volatile void __iomem *addr);
262 extern u64 __raw_readq(const volatile void __iomem *addr);
263 extern void __raw_writeb(u8 b, volatile void __iomem *addr);
264 extern void __raw_writew(u16 b, volatile void __iomem *addr);
265 extern void __raw_writel(u32 b, volatile void __iomem *addr);
266 extern void __raw_writeq(u64 b, volatile void __iomem *addr);
269 * Mapping from port numbers to __iomem space is pretty easy.
272 /* These two have to be extern inline because of the extern prototype from
273 <asm-generic/iomap.h>. It is not legal to mix "extern" and "static" for
274 the same declaration. */
275 extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
277 return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
280 extern inline void ioport_unmap(void __iomem *addr)
284 static inline void __iomem *ioremap(unsigned long port, unsigned long size)
286 return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
289 static inline void __iomem *__ioremap(unsigned long port, unsigned long size,
292 return ioremap(port, size);
295 static inline void __iomem * ioremap_nocache(unsigned long offset,
298 return ioremap(offset, size);
301 static inline void iounmap(volatile void __iomem *addr)
303 IO_CONCAT(__IO_PREFIX,iounmap)(addr);
306 static inline int __is_ioaddr(unsigned long addr)
308 return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
310 #define __is_ioaddr(a) __is_ioaddr((unsigned long)(a))
312 static inline int __is_mmio(const volatile void __iomem *addr)
314 return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
319 * If the actual I/O bits are sufficiently trivial, then expand inline.
322 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
323 extern inline unsigned int ioread8(void __iomem *addr)
325 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
330 extern inline unsigned int ioread16(void __iomem *addr)
332 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
337 extern inline void iowrite8(u8 b, void __iomem *addr)
339 IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
343 extern inline void iowrite16(u16 b, void __iomem *addr)
345 IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
349 extern inline u8 inb(unsigned long port)
351 return ioread8(ioport_map(port, 1));
354 extern inline u16 inw(unsigned long port)
356 return ioread16(ioport_map(port, 2));
359 extern inline void outb(u8 b, unsigned long port)
361 iowrite8(b, ioport_map(port, 1));
364 extern inline void outw(u16 b, unsigned long port)
366 iowrite16(b, ioport_map(port, 2));
370 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
371 extern inline unsigned int ioread32(void __iomem *addr)
373 unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
378 extern inline void iowrite32(u32 b, void __iomem *addr)
380 IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
384 extern inline u32 inl(unsigned long port)
386 return ioread32(ioport_map(port, 4));
389 extern inline void outl(u32 b, unsigned long port)
391 iowrite32(b, ioport_map(port, 4));
395 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
396 extern inline u8 __raw_readb(const volatile void __iomem *addr)
398 return IO_CONCAT(__IO_PREFIX,readb)(addr);
401 extern inline u16 __raw_readw(const volatile void __iomem *addr)
403 return IO_CONCAT(__IO_PREFIX,readw)(addr);
406 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
408 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
411 extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
413 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
416 extern inline u8 readb(const volatile void __iomem *addr)
418 u8 ret = __raw_readb(addr);
423 extern inline u16 readw(const volatile void __iomem *addr)
425 u16 ret = __raw_readw(addr);
430 extern inline void writeb(u8 b, volatile void __iomem *addr)
432 __raw_writeb(b, addr);
436 extern inline void writew(u16 b, volatile void __iomem *addr)
438 __raw_writew(b, addr);
443 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
444 extern inline u32 __raw_readl(const volatile void __iomem *addr)
446 return IO_CONCAT(__IO_PREFIX,readl)(addr);
449 extern inline u64 __raw_readq(const volatile void __iomem *addr)
451 return IO_CONCAT(__IO_PREFIX,readq)(addr);
454 extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
456 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
459 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
461 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
464 extern inline u32 readl(const volatile void __iomem *addr)
466 u32 ret = __raw_readl(addr);
471 extern inline u64 readq(const volatile void __iomem *addr)
473 u64 ret = __raw_readq(addr);
478 extern inline void writel(u32 b, volatile void __iomem *addr)
480 __raw_writel(b, addr);
484 extern inline void writeq(u64 b, volatile void __iomem *addr)
486 __raw_writeq(b, addr);
497 #define readb_relaxed(addr) __raw_readb(addr)
498 #define readw_relaxed(addr) __raw_readw(addr)
499 #define readl_relaxed(addr) __raw_readl(addr)
500 #define readq_relaxed(addr) __raw_readq(addr)
505 * String version of IO memory access ops:
507 extern void memcpy_fromio(void *, const volatile void __iomem *, long);
508 extern void memcpy_toio(volatile void __iomem *, const void *, long);
509 extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
511 static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
513 _memset_c_io(addr, 0x0101010101010101UL * c, len);
516 #define __HAVE_ARCH_MEMSETW_IO
517 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
519 _memset_c_io(addr, 0x0001000100010001UL * c, len);
523 * String versions of in/out ops:
525 extern void insb (unsigned long port, void *dst, unsigned long count);
526 extern void insw (unsigned long port, void *dst, unsigned long count);
527 extern void insl (unsigned long port, void *dst, unsigned long count);
528 extern void outsb (unsigned long port, const void *src, unsigned long count);
529 extern void outsw (unsigned long port, const void *src, unsigned long count);
530 extern void outsl (unsigned long port, const void *src, unsigned long count);
533 * The Alpha Jensen hardware for some rather strange reason puts
534 * the RTC clock at 0x170 instead of 0x70. Probably due to some
535 * misguided idea about using 0x70 for NMI stuff.
537 * These defines will override the defaults when doing RTC queries
540 #ifdef CONFIG_ALPHA_GENERIC
541 # define RTC_PORT(x) ((x) + alpha_mv.rtc_port)
543 # ifdef CONFIG_ALPHA_JENSEN
544 # define RTC_PORT(x) (0x170+(x))
546 # define RTC_PORT(x) (0x70 + (x))
549 #define RTC_ALWAYS_BCD 0
552 * Some mucking forons use if[n]def writeq to check if platform has it.
553 * It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
554 * to play with; for now just use cpp anti-recursion logics and make sure
555 * that damn thing is defined and expands to itself.
558 #define writeq writeq
562 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
565 #define xlate_dev_mem_ptr(p) __va(p)
568 * Convert a virtual cached pointer to an uncached pointer
570 #define xlate_dev_kmem_ptr(p) p
572 #endif /* __KERNEL__ */
574 #endif /* __ALPHA_IO_H */