1 /* SPDX-License-Identifier: GPL-2.0 */
7 #include <linux/kernel.h>
9 #include <asm/compiler.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 extern inline void __set_hae(unsigned long new_hae)
39 unsigned long flags = swpipl(IPL_MAX);
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;
53 extern inline void set_hae(unsigned long new_hae)
55 if (new_hae != alpha_mv.hae_cache)
60 * Change virtual addresses to physical addresses and vv.
62 #ifdef USE_48_BIT_KSEG
63 static inline unsigned long virt_to_phys(volatile void *address)
65 return (unsigned long)address - IDENT_ADDR;
68 static inline void * phys_to_virt(unsigned long address)
70 return (void *) (address + IDENT_ADDR);
73 static inline unsigned long virt_to_phys(volatile void *address)
75 unsigned long phys = (unsigned long)address;
77 /* Sign-extend from bit 41. */
79 phys = (long)phys >> (64 - 41);
81 /* Crop to the physical address width of the processor. */
82 phys &= (1ul << hwrpb->pa_bits) - 1;
87 static inline void * phys_to_virt(unsigned long address)
89 return (void *)(IDENT_ADDR + (address & ((1ul << 41) - 1)));
93 #define page_to_phys(page) page_to_pa(page)
95 /* Maximum PIO space address supported? */
96 #define IO_SPACE_LIMIT 0xffff
99 * Change addresses as seen by the kernel (virtual) to addresses as
100 * seen by a device (bus), and vice versa.
102 * Note that this only works for a limited range of kernel addresses,
103 * and very well may not span all memory. Consider this interface
104 * deprecated in favour of the DMA-mapping API.
106 extern unsigned long __direct_map_base;
107 extern unsigned long __direct_map_size;
109 static inline unsigned long __deprecated virt_to_bus(volatile void *address)
111 unsigned long phys = virt_to_phys(address);
112 unsigned long bus = phys + __direct_map_base;
113 return phys <= __direct_map_size ? bus : 0;
115 #define isa_virt_to_bus virt_to_bus
117 static inline void * __deprecated 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;
128 #define isa_bus_to_virt bus_to_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, const)
154 REMAP1(unsigned int, ioread16, const)
155 REMAP1(unsigned int, ioread32, const)
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 extern 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 #define ioremap_wc ioremap
286 #define ioremap_uc ioremap
288 static inline void iounmap(volatile void __iomem *addr)
290 IO_CONCAT(__IO_PREFIX,iounmap)(addr);
293 static inline int __is_ioaddr(unsigned long addr)
295 return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
297 #define __is_ioaddr(a) __is_ioaddr((unsigned long)(a))
299 static inline int __is_mmio(const volatile void __iomem *addr)
301 return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
306 * If the actual I/O bits are sufficiently trivial, then expand inline.
309 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
310 extern inline unsigned int ioread8(const void __iomem *addr)
314 ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
319 extern inline unsigned int ioread16(const void __iomem *addr)
323 ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
328 extern inline void iowrite8(u8 b, void __iomem *addr)
331 IO_CONCAT(__IO_PREFIX, iowrite8)(b, addr);
334 extern inline void iowrite16(u16 b, void __iomem *addr)
337 IO_CONCAT(__IO_PREFIX, iowrite16)(b, addr);
340 extern inline u8 inb(unsigned long port)
342 return ioread8(ioport_map(port, 1));
345 extern inline u16 inw(unsigned long port)
347 return ioread16(ioport_map(port, 2));
350 extern inline void outb(u8 b, unsigned long port)
352 iowrite8(b, ioport_map(port, 1));
355 extern inline void outw(u16 b, unsigned long port)
357 iowrite16(b, ioport_map(port, 2));
361 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
362 extern inline unsigned int ioread32(const void __iomem *addr)
366 ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
371 extern inline void iowrite32(u32 b, void __iomem *addr)
374 IO_CONCAT(__IO_PREFIX, iowrite32)(b, addr);
377 extern inline u32 inl(unsigned long port)
379 return ioread32(ioport_map(port, 4));
382 extern inline void outl(u32 b, unsigned long port)
384 iowrite32(b, ioport_map(port, 4));
388 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
389 extern inline u8 __raw_readb(const volatile void __iomem *addr)
391 return IO_CONCAT(__IO_PREFIX,readb)(addr);
394 extern inline u16 __raw_readw(const volatile void __iomem *addr)
396 return IO_CONCAT(__IO_PREFIX,readw)(addr);
399 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
401 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
404 extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
406 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
409 extern inline u8 readb(const volatile void __iomem *addr)
413 ret = __raw_readb(addr);
418 extern inline u16 readw(const volatile void __iomem *addr)
422 ret = __raw_readw(addr);
427 extern inline void writeb(u8 b, volatile void __iomem *addr)
430 __raw_writeb(b, addr);
433 extern inline void writew(u16 b, volatile void __iomem *addr)
436 __raw_writew(b, addr);
440 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
441 extern inline u32 __raw_readl(const volatile void __iomem *addr)
443 return IO_CONCAT(__IO_PREFIX,readl)(addr);
446 extern inline u64 __raw_readq(const volatile void __iomem *addr)
448 return IO_CONCAT(__IO_PREFIX,readq)(addr);
451 extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
453 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
456 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
458 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
461 extern inline u32 readl(const volatile void __iomem *addr)
465 ret = __raw_readl(addr);
470 extern inline u64 readq(const volatile void __iomem *addr)
474 ret = __raw_readq(addr);
479 extern inline void writel(u32 b, volatile void __iomem *addr)
482 __raw_writel(b, addr);
485 extern inline void writeq(u64 b, volatile void __iomem *addr)
488 __raw_writeq(b, addr);
492 #define ioread16be(p) swab16(ioread16(p))
493 #define ioread32be(p) swab32(ioread32(p))
494 #define iowrite16be(v,p) iowrite16(swab16(v), (p))
495 #define iowrite32be(v,p) iowrite32(swab32(v), (p))
504 extern u8 readb_relaxed(const volatile void __iomem *addr);
505 extern u16 readw_relaxed(const volatile void __iomem *addr);
506 extern u32 readl_relaxed(const volatile void __iomem *addr);
507 extern u64 readq_relaxed(const volatile void __iomem *addr);
509 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
510 extern inline u8 readb_relaxed(const volatile void __iomem *addr)
513 return __raw_readb(addr);
516 extern inline u16 readw_relaxed(const volatile void __iomem *addr)
519 return __raw_readw(addr);
523 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
524 extern inline u32 readl_relaxed(const volatile void __iomem *addr)
527 return __raw_readl(addr);
530 extern inline u64 readq_relaxed(const volatile void __iomem *addr)
533 return __raw_readq(addr);
537 #define writeb_relaxed writeb
538 #define writew_relaxed writew
539 #define writel_relaxed writel
540 #define writeq_relaxed writeq
543 * String version of IO memory access ops:
545 extern void memcpy_fromio(void *, const volatile void __iomem *, long);
546 extern void memcpy_toio(volatile void __iomem *, const void *, long);
547 extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
549 static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
551 _memset_c_io(addr, 0x0101010101010101UL * c, len);
554 #define __HAVE_ARCH_MEMSETW_IO
555 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
557 _memset_c_io(addr, 0x0001000100010001UL * c, len);
561 * String versions of in/out ops:
563 extern void insb (unsigned long port, void *dst, unsigned long count);
564 extern void insw (unsigned long port, void *dst, unsigned long count);
565 extern void insl (unsigned long port, void *dst, unsigned long count);
566 extern void outsb (unsigned long port, const void *src, unsigned long count);
567 extern void outsw (unsigned long port, const void *src, unsigned long count);
568 extern void outsl (unsigned long port, const void *src, unsigned long count);
571 * The Alpha Jensen hardware for some rather strange reason puts
572 * the RTC clock at 0x170 instead of 0x70. Probably due to some
573 * misguided idea about using 0x70 for NMI stuff.
575 * These defines will override the defaults when doing RTC queries
578 #ifdef CONFIG_ALPHA_GENERIC
579 # define RTC_PORT(x) ((x) + alpha_mv.rtc_port)
581 # ifdef CONFIG_ALPHA_JENSEN
582 # define RTC_PORT(x) (0x170+(x))
584 # define RTC_PORT(x) (0x70 + (x))
587 #define RTC_ALWAYS_BCD 0
590 * Some mucking forons use if[n]def writeq to check if platform has it.
591 * It's a bloody bad idea and we probably want ARCH_HAS_WRITEQ for them
592 * to play with; for now just use cpp anti-recursion logics and make sure
593 * that damn thing is defined and expands to itself.
596 #define writeq writeq
600 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
603 #define xlate_dev_mem_ptr(p) __va(p)
605 #endif /* __KERNEL__ */
607 #endif /* __ALPHA_IO_H */