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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
ecea4ab6 | 2 | #include <linux/export.h> |
1da177e4 | 3 | #include <linux/types.h> |
fced80c7 | 4 | #include <linux/io.h> |
c5ca95b5 EG |
5 | #include <linux/spinlock.h> |
6 | ||
7 | static DEFINE_RAW_SPINLOCK(__io_lock); | |
8 | ||
9 | /* | |
10 | * Generic atomic MMIO modify. | |
11 | * | |
12 | * Allows thread-safe access to registers shared by unrelated subsystems. | |
13 | * The access is protected by a single MMIO-wide lock. | |
14 | */ | |
15 | void atomic_io_modify_relaxed(void __iomem *reg, u32 mask, u32 set) | |
16 | { | |
17 | unsigned long flags; | |
18 | u32 value; | |
19 | ||
20 | raw_spin_lock_irqsave(&__io_lock, flags); | |
21 | value = readl_relaxed(reg) & ~mask; | |
22 | value |= (set & mask); | |
23 | writel_relaxed(value, reg); | |
24 | raw_spin_unlock_irqrestore(&__io_lock, flags); | |
25 | } | |
26 | EXPORT_SYMBOL(atomic_io_modify_relaxed); | |
27 | ||
28 | void atomic_io_modify(void __iomem *reg, u32 mask, u32 set) | |
29 | { | |
30 | unsigned long flags; | |
31 | u32 value; | |
32 | ||
33 | raw_spin_lock_irqsave(&__io_lock, flags); | |
34 | value = readl_relaxed(reg) & ~mask; | |
35 | value |= (set & mask); | |
36 | writel(value, reg); | |
37 | raw_spin_unlock_irqrestore(&__io_lock, flags); | |
38 | } | |
39 | EXPORT_SYMBOL(atomic_io_modify); | |
1da177e4 LT |
40 | |
41 | /* | |
42 | * Copy data from IO memory space to "real" memory space. | |
43 | * This needs to be optimized. | |
44 | */ | |
d2f60748 | 45 | void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count) |
1da177e4 LT |
46 | { |
47 | unsigned char *t = to; | |
48 | while (count) { | |
49 | count--; | |
50 | *t = readb(from); | |
51 | t++; | |
52 | from++; | |
53 | } | |
54 | } | |
296630c9 | 55 | EXPORT_SYMBOL(_memcpy_fromio); |
1da177e4 LT |
56 | |
57 | /* | |
58 | * Copy data from "real" memory space to IO memory space. | |
59 | * This needs to be optimized. | |
60 | */ | |
d2f60748 | 61 | void _memcpy_toio(volatile void __iomem *to, const void *from, size_t count) |
1da177e4 LT |
62 | { |
63 | const unsigned char *f = from; | |
64 | while (count) { | |
65 | count--; | |
66 | writeb(*f, to); | |
67 | f++; | |
68 | to++; | |
69 | } | |
70 | } | |
296630c9 | 71 | EXPORT_SYMBOL(_memcpy_toio); |
1da177e4 LT |
72 | |
73 | /* | |
74 | * "memset" on IO memory space. | |
75 | * This needs to be optimized. | |
76 | */ | |
d2f60748 | 77 | void _memset_io(volatile void __iomem *dst, int c, size_t count) |
1da177e4 LT |
78 | { |
79 | while (count) { | |
80 | count--; | |
81 | writeb(c, dst); | |
82 | dst++; | |
83 | } | |
84 | } | |
1da177e4 | 85 | EXPORT_SYMBOL(_memset_io); |