86 lines
1.8 KiB
C
86 lines
1.8 KiB
C
|
// SPDX-License-Identifier: GPL-2.0
|
||
|
|
#include <linux/export.h>
|
||
|
|
#include <linux/types.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
|
||
|
|
static DEFINE_RAW_SPINLOCK(__io_lock);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Generic atomic MMIO modify.
|
||
|
|
*
|
||
|
|
* Allows thread-safe access to registers shared by unrelated subsystems.
|
||
|
|
* The access is protected by a single MMIO-wide lock.
|
||
|
|
*/
|
||
|
|
void atomic_io_modify_relaxed(void __iomem *reg, u32 mask, u32 set)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
u32 value;
|
||
|
|
|
||
|
|
raw_spin_lock_irqsave(&__io_lock, flags);
|
||
|
|
value = readl_relaxed(reg) & ~mask;
|
||
|
|
value |= (set & mask);
|
||
|
|
writel_relaxed(value, reg);
|
||
|
|
raw_spin_unlock_irqrestore(&__io_lock, flags);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(atomic_io_modify_relaxed);
|
||
|
|
|
||
|
|
void atomic_io_modify(void __iomem *reg, u32 mask, u32 set)
|
||
|
|
{
|
||
|
|
unsigned long flags;
|
||
|
|
u32 value;
|
||
|
|
|
||
|
|
raw_spin_lock_irqsave(&__io_lock, flags);
|
||
|
|
value = readl_relaxed(reg) & ~mask;
|
||
|
|
value |= (set & mask);
|
||
|
|
writel(value, reg);
|
||
|
|
raw_spin_unlock_irqrestore(&__io_lock, flags);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(atomic_io_modify);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copy data from IO memory space to "real" memory space.
|
||
|
|
* This needs to be optimized.
|
||
|
|
*/
|
||
|
|
void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
|
||
|
|
{
|
||
|
|
unsigned char *t = to;
|
||
|
|
while (count) {
|
||
|
|
count--;
|
||
|
|
*t = readb(from);
|
||
|
|
t++;
|
||
|
|
from++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(_memcpy_fromio);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Copy data from "real" memory space to IO memory space.
|
||
|
|
* This needs to be optimized.
|
||
|
|
*/
|
||
|
|
void _memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
|
||
|
|
{
|
||
|
|
const unsigned char *f = from;
|
||
|
|
while (count) {
|
||
|
|
count--;
|
||
|
|
writeb(*f, to);
|
||
|
|
f++;
|
||
|
|
to++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(_memcpy_toio);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* "memset" on IO memory space.
|
||
|
|
* This needs to be optimized.
|
||
|
|
*/
|
||
|
|
void _memset_io(volatile void __iomem *dst, int c, size_t count)
|
||
|
|
{
|
||
|
|
while (count) {
|
||
|
|
count--;
|
||
|
|
writeb(c, dst);
|
||
|
|
dst++;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(_memset_io);
|