This source file includes following definitions.
- snd_dma_program
- snd_dma_disable
- snd_dma_pointer
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12 #undef HAVE_REALLY_SLOW_DMA_CONTROLLER
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14 #include <linux/export.h>
15 #include <sound/core.h>
16 #include <asm/dma.h>
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27 void snd_dma_program(unsigned long dma,
28 unsigned long addr, unsigned int size,
29 unsigned short mode)
30 {
31 unsigned long flags;
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33 flags = claim_dma_lock();
34 disable_dma(dma);
35 clear_dma_ff(dma);
36 set_dma_mode(dma, mode);
37 set_dma_addr(dma, addr);
38 set_dma_count(dma, size);
39 if (!(mode & DMA_MODE_NO_ENABLE))
40 enable_dma(dma);
41 release_dma_lock(flags);
42 }
43 EXPORT_SYMBOL(snd_dma_program);
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51 void snd_dma_disable(unsigned long dma)
52 {
53 unsigned long flags;
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55 flags = claim_dma_lock();
56 clear_dma_ff(dma);
57 disable_dma(dma);
58 release_dma_lock(flags);
59 }
60 EXPORT_SYMBOL(snd_dma_disable);
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69 unsigned int snd_dma_pointer(unsigned long dma, unsigned int size)
70 {
71 unsigned long flags;
72 unsigned int result, result1;
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74 flags = claim_dma_lock();
75 clear_dma_ff(dma);
76 if (!isa_dma_bridge_buggy)
77 disable_dma(dma);
78 result = get_dma_residue(dma);
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84 result1 = get_dma_residue(dma);
85 if (!isa_dma_bridge_buggy)
86 enable_dma(dma);
87 release_dma_lock(flags);
88 if (unlikely(result < result1))
89 result = result1;
90 #ifdef CONFIG_SND_DEBUG
91 if (result > size)
92 pr_err("ALSA: pointer (0x%x) for DMA #%ld is greater than transfer size (0x%x)\n", result, dma, size);
93 #endif
94 if (result >= size || result == 0)
95 return 0;
96 else
97 return size - result;
98 }
99 EXPORT_SYMBOL(snd_dma_pointer);