1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_IA64_IO_H
3 #define _ASM_IA64_IO_H
4
5 /*
6 * This file contains the definitions for the emulated IO instructions
7 * inb/inw/inl/outb/outw/outl and the "string versions" of the same
8 * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
9 * versions of the single-IO instructions (inb_p/inw_p/..).
10 *
11 * This file is not meant to be obfuscating: it's just complicated to
12 * (a) handle it all in a way that makes gcc able to optimize it as
13 * well as possible and (b) trying to avoid writing the same thing
14 * over and over again with slight variations and possibly making a
15 * mistake somewhere.
16 *
17 * Copyright (C) 1998-2003 Hewlett-Packard Co
18 * David Mosberger-Tang <davidm@hpl.hp.com>
19 * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com>
20 * Copyright (C) 1999 Don Dugger <don.dugger@intel.com>
21 */
22
23 #include <asm/unaligned.h>
24 #include <asm/early_ioremap.h>
25
26 /* We don't use IO slowdowns on the ia64, but.. */
27 #define __SLOW_DOWN_IO do { } while (0)
28 #define SLOW_DOWN_IO do { } while (0)
29
30 #define __IA64_UNCACHED_OFFSET RGN_BASE(RGN_UNCACHED)
31
32 /*
33 * The legacy I/O space defined by the ia64 architecture supports only 65536 ports, but
34 * large machines may have multiple other I/O spaces so we can't place any a priori limit
35 * on IO_SPACE_LIMIT. These additional spaces are described in ACPI.
36 */
37 #define IO_SPACE_LIMIT 0xffffffffffffffffUL
38
39 #define MAX_IO_SPACES_BITS 8
40 #define MAX_IO_SPACES (1UL << MAX_IO_SPACES_BITS)
41 #define IO_SPACE_BITS 24
42 #define IO_SPACE_SIZE (1UL << IO_SPACE_BITS)
43
44 #define IO_SPACE_NR(port) ((port) >> IO_SPACE_BITS)
45 #define IO_SPACE_BASE(space) ((space) << IO_SPACE_BITS)
46 #define IO_SPACE_PORT(port) ((port) & (IO_SPACE_SIZE - 1))
47
48 #define IO_SPACE_SPARSE_ENCODING(p) ((((p) >> 2) << 12) | ((p) & 0xfff))
49
50 struct io_space {
51 unsigned long mmio_base; /* base in MMIO space */
52 int sparse;
53 };
54
55 extern struct io_space io_space[];
56 extern unsigned int num_io_spaces;
57
58 # ifdef __KERNEL__
59
60 /*
61 * All MMIO iomem cookies are in region 6; anything less is a PIO cookie:
62 * 0xCxxxxxxxxxxxxxxx MMIO cookie (return from ioremap)
63 * 0x000000001SPPPPPP PIO cookie (S=space number, P..P=port)
64 *
65 * ioread/writeX() uses the leading 1 in PIO cookies (PIO_OFFSET) to catch
66 * code that uses bare port numbers without the prerequisite pci_iomap().
67 */
68 #define PIO_OFFSET (1UL << (MAX_IO_SPACES_BITS + IO_SPACE_BITS))
69 #define PIO_MASK (PIO_OFFSET - 1)
70 #define PIO_RESERVED __IA64_UNCACHED_OFFSET
71 #define HAVE_ARCH_PIO_SIZE
72
73 #include <asm/intrinsics.h>
74 #include <asm/page.h>
75 #include <asm-generic/iomap.h>
76
77 /*
78 * Change virtual addresses to physical addresses and vv.
79 */
80 static inline unsigned long
virt_to_phys(volatile void * address)81 virt_to_phys (volatile void *address)
82 {
83 return (unsigned long) address - PAGE_OFFSET;
84 }
85 #define virt_to_phys virt_to_phys
86
87 static inline void*
phys_to_virt(unsigned long address)88 phys_to_virt (unsigned long address)
89 {
90 return (void *) (address + PAGE_OFFSET);
91 }
92 #define phys_to_virt phys_to_virt
93
94 #define ARCH_HAS_VALID_PHYS_ADDR_RANGE
95 extern u64 kern_mem_attribute (unsigned long phys_addr, unsigned long size);
96 extern int valid_phys_addr_range (phys_addr_t addr, size_t count); /* efi.c */
97 extern int valid_mmap_phys_addr_range (unsigned long pfn, size_t count);
98
99 # endif /* KERNEL */
100
101 /*
102 * Memory fence w/accept. This should never be used in code that is
103 * not IA-64 specific.
104 */
105 #define __ia64_mf_a() ia64_mfa()
106
107 static inline void*
__ia64_mk_io_addr(unsigned long port)108 __ia64_mk_io_addr (unsigned long port)
109 {
110 struct io_space *space;
111 unsigned long offset;
112
113 space = &io_space[IO_SPACE_NR(port)];
114 port = IO_SPACE_PORT(port);
115 if (space->sparse)
116 offset = IO_SPACE_SPARSE_ENCODING(port);
117 else
118 offset = port;
119
120 return (void *) (space->mmio_base | offset);
121 }
122
123 /*
124 * For the in/out routines, we need to do "mf.a" _after_ doing the I/O access to ensure
125 * that the access has completed before executing other I/O accesses. Since we're doing
126 * the accesses through an uncachable (UC) translation, the CPU will execute them in
127 * program order. However, we still need to tell the compiler not to shuffle them around
128 * during optimization, which is why we use "volatile" pointers.
129 */
130
131 #define inb inb
inb(unsigned long port)132 static inline unsigned int inb(unsigned long port)
133 {
134 volatile unsigned char *addr = __ia64_mk_io_addr(port);
135 unsigned char ret;
136
137 ret = *addr;
138 __ia64_mf_a();
139 return ret;
140 }
141
142 #define inw inw
inw(unsigned long port)143 static inline unsigned int inw(unsigned long port)
144 {
145 volatile unsigned short *addr = __ia64_mk_io_addr(port);
146 unsigned short ret;
147
148 ret = *addr;
149 __ia64_mf_a();
150 return ret;
151 }
152
153 #define inl inl
inl(unsigned long port)154 static inline unsigned int inl(unsigned long port)
155 {
156 volatile unsigned int *addr = __ia64_mk_io_addr(port);
157 unsigned int ret;
158
159 ret = *addr;
160 __ia64_mf_a();
161 return ret;
162 }
163
164 #define outb outb
outb(unsigned char val,unsigned long port)165 static inline void outb(unsigned char val, unsigned long port)
166 {
167 volatile unsigned char *addr = __ia64_mk_io_addr(port);
168
169 *addr = val;
170 __ia64_mf_a();
171 }
172
173 #define outw outw
outw(unsigned short val,unsigned long port)174 static inline void outw(unsigned short val, unsigned long port)
175 {
176 volatile unsigned short *addr = __ia64_mk_io_addr(port);
177
178 *addr = val;
179 __ia64_mf_a();
180 }
181
182 #define outl outl
outl(unsigned int val,unsigned long port)183 static inline void outl(unsigned int val, unsigned long port)
184 {
185 volatile unsigned int *addr = __ia64_mk_io_addr(port);
186
187 *addr = val;
188 __ia64_mf_a();
189 }
190
191 #define insb insb
insb(unsigned long port,void * dst,unsigned long count)192 static inline void insb(unsigned long port, void *dst, unsigned long count)
193 {
194 unsigned char *dp = dst;
195
196 while (count--)
197 *dp++ = inb(port);
198 }
199
200 #define insw insw
insw(unsigned long port,void * dst,unsigned long count)201 static inline void insw(unsigned long port, void *dst, unsigned long count)
202 {
203 unsigned short *dp = dst;
204
205 while (count--)
206 put_unaligned(inw(port), dp++);
207 }
208
209 #define insl insl
insl(unsigned long port,void * dst,unsigned long count)210 static inline void insl(unsigned long port, void *dst, unsigned long count)
211 {
212 unsigned int *dp = dst;
213
214 while (count--)
215 put_unaligned(inl(port), dp++);
216 }
217
218 #define outsb outsb
outsb(unsigned long port,const void * src,unsigned long count)219 static inline void outsb(unsigned long port, const void *src,
220 unsigned long count)
221 {
222 const unsigned char *sp = src;
223
224 while (count--)
225 outb(*sp++, port);
226 }
227
228 #define outsw outsw
outsw(unsigned long port,const void * src,unsigned long count)229 static inline void outsw(unsigned long port, const void *src,
230 unsigned long count)
231 {
232 const unsigned short *sp = src;
233
234 while (count--)
235 outw(get_unaligned(sp++), port);
236 }
237
238 #define outsl outsl
outsl(unsigned long port,const void * src,unsigned long count)239 static inline void outsl(unsigned long port, const void *src,
240 unsigned long count)
241 {
242 const unsigned int *sp = src;
243
244 while (count--)
245 outl(get_unaligned(sp++), port);
246 }
247
248 # ifdef __KERNEL__
249
250 extern void __iomem * ioremap(unsigned long offset, unsigned long size);
251 extern void __iomem * ioremap_uc(unsigned long offset, unsigned long size);
252 extern void iounmap (volatile void __iomem *addr);
ioremap_cache(unsigned long phys_addr,unsigned long size)253 static inline void __iomem * ioremap_cache (unsigned long phys_addr, unsigned long size)
254 {
255 return ioremap(phys_addr, size);
256 }
257 #define ioremap ioremap
258 #define ioremap_cache ioremap_cache
259 #define ioremap_uc ioremap_uc
260 #define iounmap iounmap
261
262 /*
263 * String version of IO memory access ops:
264 */
265 extern void memcpy_fromio(void *dst, const volatile void __iomem *src, long n);
266 extern void memcpy_toio(volatile void __iomem *dst, const void *src, long n);
267 extern void memset_io(volatile void __iomem *s, int c, long n);
268
269 #define memcpy_fromio memcpy_fromio
270 #define memcpy_toio memcpy_toio
271 #define memset_io memset_io
272 #define xlate_dev_mem_ptr xlate_dev_mem_ptr
273 #include <asm-generic/io.h>
274 #undef PCI_IOBASE
275
276 # endif /* __KERNEL__ */
277
278 #endif /* _ASM_IA64_IO_H */
279