| 1 | |
| 2 | #include <linux/export.h>
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| 3 | #include <linux/types.h>
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| 4 | #include <linux/io.h>
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| 5 | #include <linux/spinlock.h>
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| 6 |
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| 7 | static DEFINE_RAW_SPINLOCK(__io_lock);
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| 8 |
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| 9 | |
| 10 | * Generic atomic MMIO modify.
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| 11 | *
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| 12 | * Allows thread-safe access to registers shared by unrelated subsystems.
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| 13 | * The access is protected by a single MMIO-wide lock.
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| 14 |
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| 15 | void atomic_io_modify_relaxed(void __iomem *reg, u32 mask, u32 set)
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| 16 | {
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| 17 | unsigned long flags;
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| 18 | u32 value;
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| 19 |
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| 20 | raw_spin_lock_irqsave(&__io_lock, flags);
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| 21 | value = readl_relaxed(reg) & ~mask;
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| 22 | value |= (set & mask);
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| 23 | writel_relaxed(value, reg);
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| 24 | raw_spin_unlock_irqrestore(&__io_lock, flags);
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| 25 | }
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| 26 | EXPORT_SYMBOL(atomic_io_modify_relaxed);
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| 27 |
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| 28 | void atomic_io_modify(void __iomem *reg, u32 mask, u32 set)
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| 29 | {
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| 30 | unsigned long flags;
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| 31 | u32 value;
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| 32 |
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| 33 | raw_spin_lock_irqsave(&__io_lock, flags);
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| 34 | value = readl_relaxed(reg) & ~mask;
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| 35 | value |= (set & mask);
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| 36 | writel(value, reg);
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| 37 | raw_spin_unlock_irqrestore(&__io_lock, flags);
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| 38 | }
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| 39 | EXPORT_SYMBOL(atomic_io_modify);
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| 40 |
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| 41 | |
| 42 | * Copy data from IO memory space to "real" memory space.
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| 43 | * This needs to be optimized.
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| 44 |
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| 45 | void _memcpy_fromio(void *to, const volatile void __iomem *from, size_t count)
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| 46 | {
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| 47 | unsigned char *t = to;
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| 48 | while (count) {
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| 49 | count--;
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| 50 | *t = readb(from);
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| 51 | t++;
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| 52 | from++;
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| 53 | }
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| 54 | }
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| 55 | EXPORT_SYMBOL(_memcpy_fromio);
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| 56 |
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| 57 | |
| 58 | * Copy data from "real" memory space to IO memory space.
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| 59 | * This needs to be optimized.
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| 60 |
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| 61 | void _memcpy_toio(volatile void __iomem *to, const void *from, size_t count)
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| 62 | {
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| 63 | const unsigned char *f = from;
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| 64 | while (count) {
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| 65 | count--;
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| 66 | writeb(*f, to);
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| 67 | f++;
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| 68 | to++;
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| 69 | }
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| 70 | }
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| 71 | EXPORT_SYMBOL(_memcpy_toio);
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| 72 |
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| 73 | |
| 74 | * "memset" on IO memory space.
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| 75 | * This needs to be optimized.
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| 76 |
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| 77 | void _memset_io(volatile void __iomem *dst, int c, size_t count)
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| 78 | {
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| 79 | while (count) {
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| 80 | count--;
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| 81 | writeb(c, dst);
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| 82 | dst++;
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| 83 | }
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| 84 | }
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| 85 | EXPORT_SYMBOL(_memset_io);
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