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 virt_to_phys virt_to_phys
94 #define phys_to_virt phys_to_virt
95 #define page_to_phys(page) page_to_pa(page)
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 DMA-mapping API.
108 extern unsigned long __direct_map_base;
109 extern unsigned long __direct_map_size;
111 static inline unsigned long __deprecated isa_virt_to_bus(volatile 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;
117 #define isa_virt_to_bus isa_virt_to_bus
119 static inline void * __deprecated isa_bus_to_virt(unsigned long address)
123 /* This check is a sanity check but also ensures that bus address 0
124 maps to virtual address 0 which is useful to detect null pointers
125 (the NCR driver is much simpler if NULL pointers are preserved). */
126 address -= __direct_map_base;
127 virt = phys_to_virt(address);
128 return (long)address <= 0 ? NULL : virt;
130 #define isa_bus_to_virt isa_bus_to_virt
133 * There are different chipsets to interface the Alpha CPUs to the world.
136 #define IO_CONCAT(a,b) _IO_CONCAT(a,b)
137 #define _IO_CONCAT(a,b) a ## _ ## b
139 #ifdef CONFIG_ALPHA_GENERIC
141 /* In a generic kernel, we always go through the machine vector. */
143 #define REMAP1(TYPE, NAME, QUAL) \
144 static inline TYPE generic_##NAME(QUAL void __iomem *addr) \
146 return alpha_mv.mv_##NAME(addr); \
149 #define REMAP2(TYPE, NAME, QUAL) \
150 static inline void generic_##NAME(TYPE b, QUAL void __iomem *addr) \
152 alpha_mv.mv_##NAME(b, addr); \
155 REMAP1(unsigned int, ioread8, const)
156 REMAP1(unsigned int, ioread16, const)
157 REMAP1(unsigned int, ioread32, const)
158 REMAP1(u64, ioread64, const)
159 REMAP1(u8, readb, const volatile)
160 REMAP1(u16, readw, const volatile)
161 REMAP1(u32, readl, const volatile)
162 REMAP1(u64, readq, const volatile)
164 REMAP2(u8, iowrite8, /**/)
165 REMAP2(u16, iowrite16, /**/)
166 REMAP2(u32, iowrite32, /**/)
167 REMAP2(u64, iowrite64, /**/)
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);
256 extern u8 readb(const volatile void __iomem *addr);
257 extern u16 readw(const volatile void __iomem *addr);
258 extern u32 readl(const volatile void __iomem *addr);
259 extern u64 readq(const volatile void __iomem *addr);
260 extern void writeb(u8 b, volatile void __iomem *addr);
261 extern void writew(u16 b, volatile void __iomem *addr);
262 extern void writel(u32 b, volatile void __iomem *addr);
263 extern void writeq(u64 b, volatile void __iomem *addr);
268 #define writeb writeb
269 #define writew writew
270 #define writel writel
271 #define writeq writeq
273 extern u8 __raw_readb(const volatile void __iomem *addr);
274 extern u16 __raw_readw(const volatile void __iomem *addr);
275 extern u32 __raw_readl(const volatile void __iomem *addr);
276 extern u64 __raw_readq(const volatile void __iomem *addr);
277 extern void __raw_writeb(u8 b, volatile void __iomem *addr);
278 extern void __raw_writew(u16 b, volatile void __iomem *addr);
279 extern void __raw_writel(u32 b, volatile void __iomem *addr);
280 extern void __raw_writeq(u64 b, volatile void __iomem *addr);
281 #define __raw_readb __raw_readb
282 #define __raw_readw __raw_readw
283 #define __raw_readl __raw_readl
284 #define __raw_readq __raw_readq
285 #define __raw_writeb __raw_writeb
286 #define __raw_writew __raw_writew
287 #define __raw_writel __raw_writel
288 #define __raw_writeq __raw_writeq
291 * Mapping from port numbers to __iomem space is pretty easy.
294 /* These two have to be extern inline because of the extern prototype from
295 <asm-generic/iomap.h>. It is not legal to mix "extern" and "static" for
296 the same declaration. */
297 extern inline void __iomem *ioport_map(unsigned long port, unsigned int size)
299 return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
302 extern inline void ioport_unmap(void __iomem *addr)
306 #define ioport_map ioport_map
307 #define ioport_unmap ioport_unmap
309 static inline void __iomem *ioremap(unsigned long port, unsigned long size)
311 return IO_CONCAT(__IO_PREFIX,ioremap) (port, size);
314 #define ioremap_wc ioremap
315 #define ioremap_uc ioremap
317 static inline void iounmap(volatile void __iomem *addr)
319 IO_CONCAT(__IO_PREFIX,iounmap)(addr);
322 static inline int __is_ioaddr(unsigned long addr)
324 return IO_CONCAT(__IO_PREFIX,is_ioaddr)(addr);
326 #define __is_ioaddr(a) __is_ioaddr((unsigned long)(a))
328 static inline int __is_mmio(const volatile void __iomem *addr)
330 return IO_CONCAT(__IO_PREFIX,is_mmio)(addr);
335 * If the actual I/O bits are sufficiently trivial, then expand inline.
338 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
339 extern inline unsigned int ioread8(const void __iomem *addr)
343 ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
348 extern inline unsigned int ioread16(const void __iomem *addr)
352 ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
357 extern inline void iowrite8(u8 b, void __iomem *addr)
360 IO_CONCAT(__IO_PREFIX, iowrite8)(b, addr);
363 extern inline void iowrite16(u16 b, void __iomem *addr)
366 IO_CONCAT(__IO_PREFIX, iowrite16)(b, addr);
369 extern inline u8 inb(unsigned long port)
371 return ioread8(ioport_map(port, 1));
374 extern inline u16 inw(unsigned long port)
376 return ioread16(ioport_map(port, 2));
379 extern inline void outb(u8 b, unsigned long port)
381 iowrite8(b, ioport_map(port, 1));
384 extern inline void outw(u16 b, unsigned long port)
386 iowrite16(b, ioport_map(port, 2));
390 #define ioread8 ioread8
391 #define ioread16 ioread16
392 #define iowrite8 iowrite8
393 #define iowrite16 iowrite16
395 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
396 extern inline unsigned int ioread32(const void __iomem *addr)
400 ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
405 extern inline u64 ioread64(const void __iomem *addr)
409 ret = IO_CONCAT(__IO_PREFIX,ioread64)(addr);
414 extern inline void iowrite32(u32 b, void __iomem *addr)
417 IO_CONCAT(__IO_PREFIX, iowrite32)(b, addr);
420 extern inline void iowrite64(u64 b, void __iomem *addr)
423 IO_CONCAT(__IO_PREFIX, iowrite64)(b, addr);
426 extern inline u32 inl(unsigned long port)
428 return ioread32(ioport_map(port, 4));
431 extern inline void outl(u32 b, unsigned long port)
433 iowrite32(b, ioport_map(port, 4));
437 #define ioread32 ioread32
438 #define ioread64 ioread64
439 #define iowrite32 iowrite32
440 #define iowrite64 iowrite64
442 #if IO_CONCAT(__IO_PREFIX,trivial_rw_bw) == 1
443 extern inline u8 __raw_readb(const volatile void __iomem *addr)
445 return IO_CONCAT(__IO_PREFIX,readb)(addr);
448 extern inline u16 __raw_readw(const volatile void __iomem *addr)
450 return IO_CONCAT(__IO_PREFIX,readw)(addr);
453 extern inline void __raw_writeb(u8 b, volatile void __iomem *addr)
455 IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
458 extern inline void __raw_writew(u16 b, volatile void __iomem *addr)
460 IO_CONCAT(__IO_PREFIX,writew)(b, addr);
463 extern inline u8 readb(const volatile void __iomem *addr)
467 ret = __raw_readb(addr);
472 extern inline u16 readw(const volatile void __iomem *addr)
476 ret = __raw_readw(addr);
481 extern inline void writeb(u8 b, volatile void __iomem *addr)
484 __raw_writeb(b, addr);
487 extern inline void writew(u16 b, volatile void __iomem *addr)
490 __raw_writew(b, addr);
494 #if IO_CONCAT(__IO_PREFIX,trivial_rw_lq) == 1
495 extern inline u32 __raw_readl(const volatile void __iomem *addr)
497 return IO_CONCAT(__IO_PREFIX,readl)(addr);
500 extern inline u64 __raw_readq(const volatile void __iomem *addr)
502 return IO_CONCAT(__IO_PREFIX,readq)(addr);
505 extern inline void __raw_writel(u32 b, volatile void __iomem *addr)
507 IO_CONCAT(__IO_PREFIX,writel)(b, addr);
510 extern inline void __raw_writeq(u64 b, volatile void __iomem *addr)
512 IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
515 extern inline u32 readl(const volatile void __iomem *addr)
519 ret = __raw_readl(addr);
524 extern inline u64 readq(const volatile void __iomem *addr)
528 ret = __raw_readq(addr);
533 extern inline void writel(u32 b, volatile void __iomem *addr)
536 __raw_writel(b, addr);
539 extern inline void writeq(u64 b, volatile void __iomem *addr)
542 __raw_writeq(b, addr);
546 #define ioread16be(p) swab16(ioread16(p))
547 #define ioread32be(p) swab32(ioread32(p))
548 #define iowrite16be(v,p) iowrite16(swab16(v), (p))
549 #define iowrite32be(v,p) iowrite32(swab32(v), (p))
558 extern u8 readb_relaxed(const volatile void __iomem *addr);
559 extern u16 readw_relaxed(const volatile void __iomem *addr);
560 extern u32 readl_relaxed(const volatile void __iomem *addr);
561 extern u64 readq_relaxed(const volatile void __iomem *addr);
562 #define readb_relaxed readb_relaxed
563 #define readw_relaxed readw_relaxed
564 #define readl_relaxed readl_relaxed
565 #define readq_relaxed readq_relaxed
567 #if IO_CONCAT(__IO_PREFIX,trivial_io_bw)
568 extern inline u8 readb_relaxed(const volatile void __iomem *addr)
571 return __raw_readb(addr);
574 extern inline u16 readw_relaxed(const volatile void __iomem *addr)
577 return __raw_readw(addr);
581 #if IO_CONCAT(__IO_PREFIX,trivial_io_lq)
582 extern inline u32 readl_relaxed(const volatile void __iomem *addr)
585 return __raw_readl(addr);
588 extern inline u64 readq_relaxed(const volatile void __iomem *addr)
591 return __raw_readq(addr);
595 #define writeb_relaxed writeb
596 #define writew_relaxed writew
597 #define writel_relaxed writel
598 #define writeq_relaxed writeq
601 * String version of IO memory access ops:
603 extern void memcpy_fromio(void *, const volatile void __iomem *, long);
604 extern void memcpy_toio(volatile void __iomem *, const void *, long);
605 extern void _memset_c_io(volatile void __iomem *, unsigned long, long);
607 static inline void memset_io(volatile void __iomem *addr, u8 c, long len)
609 _memset_c_io(addr, 0x0101010101010101UL * c, len);
612 #define __HAVE_ARCH_MEMSETW_IO
613 static inline void memsetw_io(volatile void __iomem *addr, u16 c, long len)
615 _memset_c_io(addr, 0x0001000100010001UL * c, len);
618 #define memset_io memset_io
619 #define memcpy_fromio memcpy_fromio
620 #define memcpy_toio memcpy_toio
623 * String versions of in/out ops:
625 extern void insb (unsigned long port, void *dst, unsigned long count);
626 extern void insw (unsigned long port, void *dst, unsigned long count);
627 extern void insl (unsigned long port, void *dst, unsigned long count);
628 extern void outsb (unsigned long port, const void *src, unsigned long count);
629 extern void outsw (unsigned long port, const void *src, unsigned long count);
630 extern void outsl (unsigned long port, const void *src, unsigned long count);
640 * The Alpha Jensen hardware for some rather strange reason puts
641 * the RTC clock at 0x170 instead of 0x70. Probably due to some
642 * misguided idea about using 0x70 for NMI stuff.
644 * These defines will override the defaults when doing RTC queries
647 #ifdef CONFIG_ALPHA_GENERIC
648 # define RTC_PORT(x) ((x) + alpha_mv.rtc_port)
650 # ifdef CONFIG_ALPHA_JENSEN
651 # define RTC_PORT(x) (0x170+(x))
653 # define RTC_PORT(x) (0x70 + (x))
656 #define RTC_ALWAYS_BCD 0
659 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
662 #define xlate_dev_mem_ptr(p) __va(p)
665 * These get provided from <asm-generic/iomap.h> since alpha does not
666 * select GENERIC_IOMAP.
668 #define ioread64 ioread64
669 #define iowrite64 iowrite64
670 #define ioread64be ioread64be
671 #define iowrite64be iowrite64be
672 #define ioread8_rep ioread8_rep
673 #define ioread16_rep ioread16_rep
674 #define ioread32_rep ioread32_rep
675 #define iowrite8_rep iowrite8_rep
676 #define iowrite16_rep iowrite16_rep
677 #define iowrite32_rep iowrite32_rep
678 #define pci_iounmap pci_iounmap
680 #include <asm-generic/io.h>
682 #endif /* __KERNEL__ */
684 #endif /* __ALPHA_IO_H */