tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 */
8
9#ifndef _ASM_ARC_IO_H
10#define _ASM_ARC_IO_H
11
12#include <linux/types.h>
13#include <asm/byteorder.h>
14#include <asm/page.h>
15#include <asm/unaligned.h>
16
17#ifdef CONFIG_ISA_ARCV2
18#include <asm/barrier.h>
19#define __iormb() rmb()
20#define __iowmb() wmb()
21#else
22#define __iormb() do { } while (0)
23#define __iowmb() do { } while (0)
24#endif
25
26extern void __iomem *ioremap(phys_addr_t paddr, unsigned long size);
27extern void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size,
28 unsigned long flags);
29static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
30{
31 return (void __iomem *)port;
32}
33
34static inline void ioport_unmap(void __iomem *addr)
35{
36}
37
38extern void iounmap(const void __iomem *addr);
39
40#define ioremap_nocache(phy, sz) ioremap(phy, sz)
41#define ioremap_wc(phy, sz) ioremap(phy, sz)
42#define ioremap_wt(phy, sz) ioremap(phy, sz)
43
44/*
45 * io{read,write}{16,32}be() macros
46 */
47#define ioread16be(p) ({ u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; })
48#define ioread32be(p) ({ u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __v; })
49
50#define iowrite16be(v,p) ({ __iowmb(); __raw_writew((__force u16)cpu_to_be16(v), p); })
51#define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force u32)cpu_to_be32(v), p); })
52
53/* Change struct page to physical address */
54#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
55
56#define __raw_readb __raw_readb
57static inline u8 __raw_readb(const volatile void __iomem *addr)
58{
59 u8 b;
60
61 __asm__ __volatile__(
62 " ldb%U1 %0, %1 \n"
63 : "=r" (b)
64 : "m" (*(volatile u8 __force *)addr)
65 : "memory");
66
67 return b;
68}
69
70#define __raw_readw __raw_readw
71static inline u16 __raw_readw(const volatile void __iomem *addr)
72{
73 u16 s;
74
75 __asm__ __volatile__(
76 " ldw%U1 %0, %1 \n"
77 : "=r" (s)
78 : "m" (*(volatile u16 __force *)addr)
79 : "memory");
80
81 return s;
82}
83
84#define __raw_readl __raw_readl
85static inline u32 __raw_readl(const volatile void __iomem *addr)
86{
87 u32 w;
88
89 __asm__ __volatile__(
90 " ld%U1 %0, %1 \n"
91 : "=r" (w)
92 : "m" (*(volatile u32 __force *)addr)
93 : "memory");
94
95 return w;
96}
97
98/*
99 * {read,write}s{b,w,l}() repeatedly access the same IO address in
100 * native endianness in 8-, 16-, 32-bit chunks {into,from} memory,
101 * @count times
102 */
103#define __raw_readsx(t,f) \
104static inline void __raw_reads##f(const volatile void __iomem *addr, \
105 void *ptr, unsigned int count) \
106{ \
107 bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0; \
108 u##t *buf = ptr; \
109 \
110 if (!count) \
111 return; \
112 \
113 /* Some ARC CPU's don't support unaligned accesses */ \
114 if (is_aligned) { \
115 do { \
116 u##t x = __raw_read##f(addr); \
117 *buf++ = x; \
118 } while (--count); \
119 } else { \
120 do { \
121 u##t x = __raw_read##f(addr); \
122 put_unaligned(x, buf++); \
123 } while (--count); \
124 } \
125}
126
127#define __raw_readsb __raw_readsb
128__raw_readsx(8, b)
129#define __raw_readsw __raw_readsw
130__raw_readsx(16, w)
131#define __raw_readsl __raw_readsl
132__raw_readsx(32, l)
133
134#define __raw_writeb __raw_writeb
135static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
136{
137 __asm__ __volatile__(
138 " stb%U1 %0, %1 \n"
139 :
140 : "r" (b), "m" (*(volatile u8 __force *)addr)
141 : "memory");
142}
143
144#define __raw_writew __raw_writew
145static inline void __raw_writew(u16 s, volatile void __iomem *addr)
146{
147 __asm__ __volatile__(
148 " stw%U1 %0, %1 \n"
149 :
150 : "r" (s), "m" (*(volatile u16 __force *)addr)
151 : "memory");
152
153}
154
155#define __raw_writel __raw_writel
156static inline void __raw_writel(u32 w, volatile void __iomem *addr)
157{
158 __asm__ __volatile__(
159 " st%U1 %0, %1 \n"
160 :
161 : "r" (w), "m" (*(volatile u32 __force *)addr)
162 : "memory");
163
164}
165
166#define __raw_writesx(t,f) \
167static inline void __raw_writes##f(volatile void __iomem *addr, \
168 const void *ptr, unsigned int count) \
169{ \
170 bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0; \
171 const u##t *buf = ptr; \
172 \
173 if (!count) \
174 return; \
175 \
176 /* Some ARC CPU's don't support unaligned accesses */ \
177 if (is_aligned) { \
178 do { \
179 __raw_write##f(*buf++, addr); \
180 } while (--count); \
181 } else { \
182 do { \
183 __raw_write##f(get_unaligned(buf++), addr); \
184 } while (--count); \
185 } \
186}
187
188#define __raw_writesb __raw_writesb
189__raw_writesx(8, b)
190#define __raw_writesw __raw_writesw
191__raw_writesx(16, w)
192#define __raw_writesl __raw_writesl
193__raw_writesx(32, l)
194
195/*
196 * MMIO can also get buffered/optimized in micro-arch, so barriers needed
197 * Based on ARM model for the typical use case
198 *
199 * <ST [DMA buffer]>
200 * <writel MMIO "go" reg>
201 * or:
202 * <readl MMIO "status" reg>
203 * <LD [DMA buffer]>
204 *
205 * http://lkml.kernel.org/r/20150622133656.GG1583@arm.com
206 */
207#define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; })
208#define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
209#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; })
210#define readsb(p,d,l) ({ __raw_readsb(p,d,l); __iormb(); })
211#define readsw(p,d,l) ({ __raw_readsw(p,d,l); __iormb(); })
212#define readsl(p,d,l) ({ __raw_readsl(p,d,l); __iormb(); })
213
214#define writeb(v,c) ({ __iowmb(); writeb_relaxed(v,c); })
215#define writew(v,c) ({ __iowmb(); writew_relaxed(v,c); })
216#define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); })
217#define writesb(p,d,l) ({ __iowmb(); __raw_writesb(p,d,l); })
218#define writesw(p,d,l) ({ __iowmb(); __raw_writesw(p,d,l); })
219#define writesl(p,d,l) ({ __iowmb(); __raw_writesl(p,d,l); })
220
221/*
222 * Relaxed API for drivers which can handle barrier ordering themselves
223 *
224 * Also these are defined to perform little endian accesses.
225 * To provide the typical device register semantics of fixed endian,
226 * swap the byte order for Big Endian
227 *
228 * http://lkml.kernel.org/r/201603100845.30602.arnd@arndb.de
229 */
230#define readb_relaxed(c) __raw_readb(c)
231#define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16) \
232 __raw_readw(c)); __r; })
233#define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
234 __raw_readl(c)); __r; })
235
236#define writeb_relaxed(v,c) __raw_writeb(v,c)
237#define writew_relaxed(v,c) __raw_writew((__force u16) cpu_to_le16(v),c)
238#define writel_relaxed(v,c) __raw_writel((__force u32) cpu_to_le32(v),c)
239
240#include <asm-generic/io.h>
241
242#endif /* _ASM_ARC_IO_H */