4.104.115
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[b2a4e861] | 1 | #include <rtems.h> |
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| 2 | #include <bsp.h> |
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| 3 | #include <s3c2400.h> |
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| 4 | |
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| 5 | /* ------------------------------------------------------------------------- */ |
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| 6 | /* NOTE: This describes the proper use of this file. |
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| 7 | * |
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| 8 | * BSP_OSC_FREQ should be defined as the input frequency of the PLL. |
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| 9 | * |
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| 10 | * get_FCLK(), get_HCLK(), get_PCLK() and get_UCLK() return the clock of |
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| 11 | * the specified bus in HZ. |
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| 12 | */ |
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| 13 | /* ------------------------------------------------------------------------- */ |
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| 14 | |
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[1f18710] | 15 | /* return FCLK frequency */ |
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| 16 | uint32_t get_FCLK(void) |
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[b2a4e861] | 17 | { |
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| 18 | uint32_t r, m, p, s; |
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| 19 | |
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[1f18710] | 20 | r = rMPLLCON; |
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[b2a4e861] | 21 | m = ((r & 0xFF000) >> 12) + 8; |
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| 22 | p = ((r & 0x003F0) >> 4) + 2; |
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| 23 | s = r & 0x3; |
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| 24 | |
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| 25 | return((BSP_OSC_FREQ * m) / (p << s)); |
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| 26 | } |
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| 27 | |
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[1f18710] | 28 | /* return UCLK frequency */ |
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| 29 | uint32_t get_UCLK(void) |
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[b2a4e861] | 30 | { |
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[1f18710] | 31 | uint32_t r, m, p, s; |
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| 32 | |
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| 33 | r = rUPLLCON; |
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| 34 | m = ((r & 0xFF000) >> 12) + 8; |
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| 35 | p = ((r & 0x003F0) >> 4) + 2; |
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| 36 | s = r & 0x3; |
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| 37 | |
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| 38 | return((BSP_OSC_FREQ * m) / (p << s)); |
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[b2a4e861] | 39 | } |
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| 40 | |
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| 41 | /* return HCLK frequency */ |
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| 42 | uint32_t get_HCLK(void) |
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| 43 | { |
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[359e537] | 44 | if (rCLKDIVN & 0x2) |
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[1f18710] | 45 | return get_FCLK()/2; |
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| 46 | else |
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[359e537] | 47 | return get_FCLK(); |
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[b2a4e861] | 48 | } |
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| 49 | |
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| 50 | /* return PCLK frequency */ |
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| 51 | uint32_t get_PCLK(void) |
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| 52 | { |
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[1f18710] | 53 | if (rCLKDIVN & 0x1) |
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| 54 | return get_HCLK()/2; |
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| 55 | else |
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| 56 | return get_HCLK(); |
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[b2a4e861] | 57 | } |
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