io.c (da733563be5a9da26fe81d9f007262d00b846e22) io.c (c5ca95b507c8a2a69e49eeda539b41bd76922d7f)
1#include <linux/export.h>
2#include <linux/types.h>
3#include <linux/io.h>
1#include <linux/export.h>
2#include <linux/types.h>
3#include <linux/io.h>
4#include <linux/spinlock.h>
4
5
6static DEFINE_RAW_SPINLOCK(__io_lock);
7
5/*
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 */
14void 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}
25EXPORT_SYMBOL(atomic_io_modify_relaxed);
26
27void 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}
38EXPORT_SYMBOL(atomic_io_modify);
39
40/*
6 * Copy data from IO memory space to "real" memory space.
7 * This needs to be optimized.
8 */
9void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
10{
11 unsigned char *t = to;
12 while (count) {
13 count--;

--- 37 unchanged lines hidden --- 		41 * Copy data from IO memory space to "real" memory space.
42 * This needs to be optimized.
43 */
44void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
45{
46 unsigned char *t = to;
47 while (count) {
48 count--;

--- 37 unchanged lines hidden ---