[1612af0] | 1 | /* |
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| 2 | * Use the last periodic interval timer (PIT3) as the system clock. |
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| 3 | * |
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| 4 | * $Id$ |
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| 5 | */ |
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| 6 | |
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| 7 | #include <rtems.h> |
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| 8 | #include <bsp.h> |
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| 9 | #include <mcf5235/mcf5235.h> |
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| 10 | |
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| 11 | /* |
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| 12 | * Use INTC0 base |
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| 13 | */ |
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| 14 | #define CLOCK_VECTOR (64+39) |
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| 15 | |
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| 16 | /* |
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| 17 | * Periodic interval timer interrupt handler |
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| 18 | */ |
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| 19 | #define Clock_driver_support_at_tick() \ |
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| 20 | do { \ |
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| 21 | MCF5235_PIT_PCSR3 |= MCF5235_PIT_PCSR_PIF; \ |
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| 22 | } while (0) \ |
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| 23 | |
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| 24 | /* |
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| 25 | * Attach clock interrupt handler |
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| 26 | */ |
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| 27 | #define Clock_driver_support_install_isr( _new, _old ) \ |
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| 28 | do { \ |
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| 29 | _old = (rtems_isr_entry)set_vector(_new, CLOCK_VECTOR, 1); \ |
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| 30 | } while(0) |
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| 31 | |
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| 32 | /* |
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| 33 | * Turn off the clock |
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| 34 | */ |
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| 35 | #define Clock_driver_support_shutdown_hardware() \ |
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| 36 | do { \ |
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| 37 | MCF5235_PIT_PCSR3 &= ~MCF5235_PIT_PCSR_EN; \ |
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| 38 | } while(0) |
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| 39 | |
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| 40 | /* |
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| 41 | * Set up the clock hardware |
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| 42 | * |
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| 43 | * We need to have 1 interrupt every 10,000 microseconds |
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| 44 | * so we need to set prescaler to 64 and the PMR register to 0x2DC6 |
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| 45 | */ |
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| 46 | #define Clock_driver_support_initialize_hardware() \ |
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| 47 | do { \ |
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| 48 | int level; \ |
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| 49 | int preScaleCode = 6; \ |
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| 50 | MCF5235_INTC0_ICR39 = MCF5235_INTC_ICR_IL(PIT3_IRQ_LEVEL) | \ |
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| 51 | MCF5235_INTC_ICR_IP(PIT3_IRQ_PRIORITY); \ |
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| 52 | rtems_interrupt_disable( level ); \ |
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| 53 | MCF5235_INTC0_IMRH &= ~MCF5235_INTC0_IMRH_INT39; \ |
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| 54 | MCF5235_PIT_PCSR3 &= ~MCF5235_PIT_PCSR_EN; \ |
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| 55 | rtems_interrupt_enable( level ); \ |
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| 56 | MCF5235_PIT_PMR3 = 0x2DC6; \ |
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| 57 | MCF5235_PIT_PCSR3 = MCF5235_PIT_PCSR_PRE(preScaleCode) | \ |
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| 58 | MCF5235_PIT_PCSR_PIE | \ |
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| 59 | MCF5235_PIT_PCSR_RLD | \ |
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| 60 | MCF5235_PIT_PCSR_EN; \ |
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| 61 | } while (0) |
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| 62 | |
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| 63 | #include "../../../shared/clockdrv_shell.c" |
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