1#include <linux/export.h>
 2#include <linux/types.h>
 3#include <linux/io.h>
 4#include <linux/spinlock.h>
 5
 6static 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 */
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/*
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--;
49		*t = readb(from);
50		t++;
51		from++;
52	}
53}
54EXPORT_SYMBOL(_memcpy_fromio);
55
56/*
57 * Copy data from "real" memory space to IO memory space.
58 * This needs to be optimized.
59 */
60void _memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
61{
62	const unsigned char *f = from;
63	while (count) {
64		count--;
65		writeb(*f, to);
66		f++;
67		to++;
68	}
69}
70EXPORT_SYMBOL(_memcpy_toio);
71
72/*
73 * "memset" on IO memory space.
74 * This needs to be optimized.
75 */
76void _memset_io(volatile void __iomem *dst, int c, size_t count)
77{
78	while (count) {
79		count--;
80		writeb(c, dst);
81		dst++;
82	}
83}
84EXPORT_SYMBOL(_memset_io);

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/export.h>
 3#include <linux/types.h>
 4#include <linux/io.h>
 5#include <linux/spinlock.h>
 6
 7static 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 */
15void 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}
26EXPORT_SYMBOL(atomic_io_modify_relaxed);
27
28void 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}
39EXPORT_SYMBOL(atomic_io_modify);
40
41/*
42 * Copy data from IO memory space to "real" memory space.
43 * This needs to be optimized.
44 */
45void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
46{
47	unsigned char *t = to;
48	while (count) {
49		count--;
50		*t = readb(from);
51		t++;
52		from++;
53	}
54}
55EXPORT_SYMBOL(_memcpy_fromio);
56
57/*
58 * Copy data from "real" memory space to IO memory space.
59 * This needs to be optimized.
60 */
61void _memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
62{
63	const unsigned char *f = from;
64	while (count) {
65		count--;
66		writeb(*f, to);
67		f++;
68		to++;
69	}
70}
71EXPORT_SYMBOL(_memcpy_toio);
72
73/*
74 * "memset" on IO memory space.
75 * This needs to be optimized.
76 */
77void _memset_io(volatile void __iomem *dst, int c, size_t count)
78{
79	while (count) {
80		count--;
81		writeb(c, dst);
82		dst++;
83	}
84}
85EXPORT_SYMBOL(_memset_io);