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