1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 */
5
6 #ifndef _ASM_ARC_IO_H
7 #define _ASM_ARC_IO_H
8
9 #include <linux/types.h>
10 #include <asm/byteorder.h>
11 #include <asm/page.h>
12 #include <linux/unaligned.h>
13
14 #ifdef CONFIG_ISA_ARCV2
15 #include <asm/barrier.h>
16 #define __iormb() rmb()
17 #define __iowmb() wmb()
18 #else
19 #define __iormb() do { } while (0)
20 #define __iowmb() do { } while (0)
21 #endif
22
23 extern void __iomem *ioremap(phys_addr_t paddr, unsigned long size);
24 #define ioremap ioremap
25 #define ioremap_prot ioremap_prot
26 #define iounmap iounmap
ioport_map(unsigned long port,unsigned int nr)27 static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
28 {
29 return (void __iomem *)port;
30 }
31
ioport_unmap(void __iomem * addr)32 static inline void ioport_unmap(void __iomem *addr)
33 {
34 }
35
36 /*
37 * io{read,write}{16,32}be() macros
38 */
39 #define ioread16be(p) ({ u16 __v = be16_to_cpu((__force __be16)__raw_readw(p)); __iormb(); __v; })
40 #define ioread32be(p) ({ u32 __v = be32_to_cpu((__force __be32)__raw_readl(p)); __iormb(); __v; })
41
42 #define iowrite16be(v,p) ({ __iowmb(); __raw_writew((__force u16)cpu_to_be16(v), p); })
43 #define iowrite32be(v,p) ({ __iowmb(); __raw_writel((__force u32)cpu_to_be32(v), p); })
44
45 /* Change struct page to physical address */
46 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
47
48 #define __raw_readb __raw_readb
__raw_readb(const volatile void __iomem * addr)49 static inline u8 __raw_readb(const volatile void __iomem *addr)
50 {
51 u8 b;
52
53 __asm__ __volatile__(
54 " ldb%U1 %0, %1 \n"
55 : "=r" (b)
56 : "m" (*(volatile u8 __force *)addr)
57 : "memory");
58
59 return b;
60 }
61
62 #define __raw_readw __raw_readw
__raw_readw(const volatile void __iomem * addr)63 static inline u16 __raw_readw(const volatile void __iomem *addr)
64 {
65 u16 s;
66
67 __asm__ __volatile__(
68 " ldw%U1 %0, %1 \n"
69 : "=r" (s)
70 : "m" (*(volatile u16 __force *)addr)
71 : "memory");
72
73 return s;
74 }
75
76 #define __raw_readl __raw_readl
__raw_readl(const volatile void __iomem * addr)77 static inline u32 __raw_readl(const volatile void __iomem *addr)
78 {
79 u32 w;
80
81 __asm__ __volatile__(
82 " ld%U1 %0, %1 \n"
83 : "=r" (w)
84 : "m" (*(volatile u32 __force *)addr)
85 : "memory");
86
87 return w;
88 }
89
90 /*
91 * {read,write}s{b,w,l}() repeatedly access the same IO address in
92 * native endianness in 8-, 16-, 32-bit chunks {into,from} memory,
93 * @count times
94 */
95 #define __raw_readsx(t,f) \
96 static inline void __raw_reads##f(const volatile void __iomem *addr, \
97 void *ptr, unsigned int count) \
98 { \
99 bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0; \
100 u##t *buf = ptr; \
101 \
102 if (!count) \
103 return; \
104 \
105 /* Some ARC CPU's don't support unaligned accesses */ \
106 if (is_aligned) { \
107 do { \
108 u##t x = __raw_read##f(addr); \
109 *buf++ = x; \
110 } while (--count); \
111 } else { \
112 do { \
113 u##t x = __raw_read##f(addr); \
114 put_unaligned(x, buf++); \
115 } while (--count); \
116 } \
117 }
118
119 #define __raw_readsb __raw_readsb
120 __raw_readsx(8, b)
121 #define __raw_readsw __raw_readsw
122 __raw_readsx(16, w)
123 #define __raw_readsl __raw_readsl
124 __raw_readsx(32, l)
125
126 #define __raw_writeb __raw_writeb
__raw_writeb(u8 b,volatile void __iomem * addr)127 static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
128 {
129 __asm__ __volatile__(
130 " stb%U1 %0, %1 \n"
131 :
132 : "r" (b), "m" (*(volatile u8 __force *)addr)
133 : "memory");
134 }
135
136 #define __raw_writew __raw_writew
__raw_writew(u16 s,volatile void __iomem * addr)137 static inline void __raw_writew(u16 s, volatile void __iomem *addr)
138 {
139 __asm__ __volatile__(
140 " stw%U1 %0, %1 \n"
141 :
142 : "r" (s), "m" (*(volatile u16 __force *)addr)
143 : "memory");
144
145 }
146
147 #define __raw_writel __raw_writel
__raw_writel(u32 w,volatile void __iomem * addr)148 static inline void __raw_writel(u32 w, volatile void __iomem *addr)
149 {
150 __asm__ __volatile__(
151 " st%U1 %0, %1 \n"
152 :
153 : "r" (w), "m" (*(volatile u32 __force *)addr)
154 : "memory");
155
156 }
157
158 #define __raw_writesx(t,f) \
159 static inline void __raw_writes##f(volatile void __iomem *addr, \
160 const void *ptr, unsigned int count) \
161 { \
162 bool is_aligned = ((unsigned long)ptr % ((t) / 8)) == 0; \
163 const u##t *buf = ptr; \
164 \
165 if (!count) \
166 return; \
167 \
168 /* Some ARC CPU's don't support unaligned accesses */ \
169 if (is_aligned) { \
170 do { \
171 __raw_write##f(*buf++, addr); \
172 } while (--count); \
173 } else { \
174 do { \
175 __raw_write##f(get_unaligned(buf++), addr); \
176 } while (--count); \
177 } \
178 }
179
180 #define __raw_writesb __raw_writesb
181 __raw_writesx(8, b)
182 #define __raw_writesw __raw_writesw
183 __raw_writesx(16, w)
184 #define __raw_writesl __raw_writesl
185 __raw_writesx(32, l)
186
187 /*
188 * MMIO can also get buffered/optimized in micro-arch, so barriers needed
189 * Based on ARM model for the typical use case
190 *
191 * <ST [DMA buffer]>
192 * <writel MMIO "go" reg>
193 * or:
194 * <readl MMIO "status" reg>
195 * <LD [DMA buffer]>
196 *
197 * http://lkml.kernel.org/r/20150622133656.GG1583@arm.com
198 */
199 #define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; })
200 #define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; })
201 #define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; })
202 #define readsb(p,d,l) ({ __raw_readsb(p,d,l); __iormb(); })
203 #define readsw(p,d,l) ({ __raw_readsw(p,d,l); __iormb(); })
204 #define readsl(p,d,l) ({ __raw_readsl(p,d,l); __iormb(); })
205
206 #define writeb(v,c) ({ __iowmb(); writeb_relaxed(v,c); })
207 #define writew(v,c) ({ __iowmb(); writew_relaxed(v,c); })
208 #define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); })
209 #define writesb(p,d,l) ({ __iowmb(); __raw_writesb(p,d,l); })
210 #define writesw(p,d,l) ({ __iowmb(); __raw_writesw(p,d,l); })
211 #define writesl(p,d,l) ({ __iowmb(); __raw_writesl(p,d,l); })
212
213 /*
214 * Relaxed API for drivers which can handle barrier ordering themselves
215 *
216 * Also these are defined to perform little endian accesses.
217 * To provide the typical device register semantics of fixed endian,
218 * swap the byte order for Big Endian
219 *
220 * http://lkml.kernel.org/r/201603100845.30602.arnd@arndb.de
221 */
222 #define readb_relaxed(c) __raw_readb(c)
223 #define readw_relaxed(c) ({ u16 __r = le16_to_cpu((__force __le16) \
224 __raw_readw(c)); __r; })
225 #define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \
226 __raw_readl(c)); __r; })
227
228 #define writeb_relaxed(v,c) __raw_writeb(v,c)
229 #define writew_relaxed(v,c) __raw_writew((__force u16) cpu_to_le16(v),c)
230 #define writel_relaxed(v,c) __raw_writel((__force u32) cpu_to_le32(v),c)
231
232 #include <asm-generic/io.h>
233
234 #endif /* _ASM_ARC_IO_H */
235