1 #include <linux/export.h>
2 #include <linux/types.h>
4 #include <linux/spinlock.h>
6 static DEFINE_RAW_SPINLOCK(__io_lock);
9 * Generic atomic MMIO modify.
11 * Allows thread-safe access to registers shared by unrelated subsystems.
12 * The access is protected by a single MMIO-wide lock.
14 void atomic_io_modify_relaxed(void __iomem *reg, u32 mask, u32 set)
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);
25 EXPORT_SYMBOL(atomic_io_modify_relaxed);
27 void atomic_io_modify(void __iomem *reg, u32 mask, u32 set)
32 raw_spin_lock_irqsave(&__io_lock, flags);
33 value = readl_relaxed(reg) & ~mask;
34 value |= (set & mask);
36 raw_spin_unlock_irqrestore(&__io_lock, flags);
38 EXPORT_SYMBOL(atomic_io_modify);
41 * Copy data from IO memory space to "real" memory space.
42 * This needs to be optimized.
44 void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
46 unsigned char *t = to;
56 * Copy data from "real" memory space to IO memory space.
57 * This needs to be optimized.
59 void _memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
61 const unsigned char *f = from;
71 * "memset" on IO memory space.
72 * This needs to be optimized.
74 void _memset_io(volatile void __iomem *dst, int c, size_t count)
83 EXPORT_SYMBOL(_memcpy_fromio);
84 EXPORT_SYMBOL(_memcpy_toio);
85 EXPORT_SYMBOL(_memset_io);