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Linux/arch/arm/kernel/io.c

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  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 
  7 static 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  */
 15 void 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 }
 26 EXPORT_SYMBOL(atomic_io_modify_relaxed);
 27 
 28 void 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 }
 39 EXPORT_SYMBOL(atomic_io_modify);
 40 
 41 /*
 42  * Copy data from IO memory space to "real" memory space.
 43  * This needs to be optimized.
 44  */
 45 void _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 }
 55 EXPORT_SYMBOL(_memcpy_fromio);
 56 
 57 /*
 58  * Copy data from "real" memory space to IO memory space.
 59  * This needs to be optimized.
 60  */
 61 void _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 }
 71 EXPORT_SYMBOL(_memcpy_toio);
 72 
 73 /*
 74  * "memset" on IO memory space.
 75  * This needs to be optimized.
 76  */
 77 void _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 }
 85 EXPORT_SYMBOL(_memset_io);
 86 

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