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