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(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(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(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, /**/)
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 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(void __iomem *addr)
314 ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
319 extern inline unsigned int ioread16(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(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) be16_to_cpu(ioread16(p))
493 #define ioread32be(p) be32_to_cpu(ioread32(p))
494 #define iowrite16be(v,p) iowrite16(cpu_to_be16(v), (p))
495 #define iowrite32be(v,p) iowrite32(cpu_to_be32(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)
606 * Convert a virtual cached pointer to an uncached pointer
608 #define xlate_dev_kmem_ptr(p) p
610 #endif /* __KERNEL__ */
612 #endif /* __ALPHA_IO_H */