[00717a3] | 1 | /* |
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| 2 | * Clock Driver for MCF5206eLITE board |
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| 3 | * |
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[1857b00] | 4 | * This driver initailizes timer1 on the MCF5206E as the |
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| 5 | * main system clock |
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[40716bf] | 6 | */ |
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| 7 | |
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| 8 | /* |
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[00717a3] | 9 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
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| 10 | * |
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| 11 | * Based on work: |
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| 12 | * David Fiddes, D.J@fiddes.surfaid.org |
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| 13 | * http://www.calm.hw.ac.uk/davidf/coldfire/ |
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| 14 | * |
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| 15 | * COPYRIGHT (c) 1989-1998. |
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| 16 | * On-Line Applications Research Corporation (OAR). |
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| 17 | * |
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| 18 | * The license and distribution terms for this file may be |
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| 19 | * found in the file LICENSE in this distribution or at |
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[c499856] | 20 | * http://www.rtems.org/license/LICENSE. |
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[00717a3] | 21 | */ |
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| 22 | |
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| 23 | #include <stdlib.h> |
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| 24 | #include <bsp.h> |
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| 25 | #include <rtems/libio.h> |
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[d0cffc73] | 26 | #include <rtems/clockdrv.h> |
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[00717a3] | 27 | #include "mcf5206/mcf5206e.h" |
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| 28 | |
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| 29 | /* |
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| 30 | * Clock_driver_ticks is a monotonically increasing counter of the |
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| 31 | * number of clock ticks since the driver was initialized. |
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| 32 | */ |
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[8bc4430b] | 33 | volatile uint32_t Clock_driver_ticks; |
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[00717a3] | 34 | |
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| 35 | rtems_isr (*rtems_clock_hook)(rtems_vector_number) = NULL; |
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| 36 | |
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[40716bf] | 37 | static rtems_isr |
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[00717a3] | 38 | Clock_isr (rtems_vector_number vector) |
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| 39 | { |
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| 40 | /* Clear pending interrupt... */ |
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| 41 | *MCF5206E_TER(MBAR,1) = MCF5206E_TER_REF | MCF5206E_TER_CAP; |
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| 42 | |
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| 43 | /* Announce the clock tick */ |
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| 44 | Clock_driver_ticks++; |
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| 45 | rtems_clock_tick(); |
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| 46 | if (rtems_clock_hook != NULL) |
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| 47 | rtems_clock_hook(vector); |
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| 48 | } |
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| 49 | |
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| 50 | void |
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| 51 | Clock_exit(void) |
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| 52 | { |
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[40716bf] | 53 | /* disable all timer1 interrupts */ |
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| 54 | *MCF5206E_IMR(MBAR) |= MCF5206E_INTR_BIT(MCF5206E_INTR_TIMER_1); |
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[00717a3] | 55 | |
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[40716bf] | 56 | /* reset timer1 */ |
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| 57 | *MCF5206E_TMR(MBAR,1) = MCF5206E_TMR_ICLK_STOP; |
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[00717a3] | 58 | |
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[40716bf] | 59 | /* clear pending */ |
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| 60 | *MCF5206E_TER(MBAR,1) = MCF5206E_TER_REF | MCF5206E_TER_CAP; |
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[00717a3] | 61 | } |
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| 62 | |
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| 63 | |
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| 64 | static void |
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| 65 | Install_clock(rtems_isr_entry clock_isr) |
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| 66 | { |
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[40716bf] | 67 | Clock_driver_ticks = 0; |
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| 68 | |
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| 69 | /* Configure timer1 interrupts */ |
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| 70 | *MCF5206E_ICR(MBAR,MCF5206E_INTR_TIMER_1) = |
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| 71 | MCF5206E_ICR_AVEC | |
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| 72 | ((BSP_INTLVL_TIMER1 << MCF5206E_ICR_IL_S) & MCF5206E_ICR_IL) | |
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| 73 | ((BSP_INTPRIO_TIMER1 << MCF5206E_ICR_IP_S) & MCF5206E_ICR_IP); |
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| 74 | |
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| 75 | /* Register the interrupt handler */ |
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| 76 | set_vector(clock_isr, BSP_INTVEC_TIMER1, 1); |
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| 77 | |
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| 78 | /* Reset timer 1 */ |
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| 79 | *MCF5206E_TMR(MBAR, 1) = MCF5206E_TMR_RST; |
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| 80 | *MCF5206E_TMR(MBAR, 1) = MCF5206E_TMR_ICLK_STOP; |
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| 81 | *MCF5206E_TMR(MBAR, 1) = MCF5206E_TMR_RST; |
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| 82 | *MCF5206E_TCN(MBAR, 1) = 0; /* Reset counter */ |
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| 83 | *MCF5206E_TER(MBAR, 1) = MCF5206E_TER_REF | MCF5206E_TER_CAP; |
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| 84 | |
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| 85 | /* Set Timer 1 prescaler so that it counts in microseconds */ |
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| 86 | *MCF5206E_TMR(MBAR, 1) = |
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| 87 | (((BSP_SYSTEM_FREQUENCY/1000000 - 1) << MCF5206E_TMR_PS_S) & |
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| 88 | MCF5206E_TMR_PS) | |
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| 89 | MCF5206E_TMR_CE_NONE | MCF5206E_TMR_ORI | MCF5206E_TMR_FRR | |
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| 90 | MCF5206E_TMR_RST; |
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| 91 | |
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| 92 | /* Set the timer timeout value from the BSP config */ |
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| 93 | *MCF5206E_TRR(MBAR, 1) = rtems_configuration_get_microseconds_per_tick() - 1; |
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| 94 | |
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| 95 | /* Feed system frequency to the timer */ |
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| 96 | *MCF5206E_TMR(MBAR, 1) |= MCF5206E_TMR_ICLK_MSCLK; |
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| 97 | |
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| 98 | /* Enable timer 1 interrupts */ |
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| 99 | *MCF5206E_IMR(MBAR) &= ~MCF5206E_INTR_BIT(MCF5206E_INTR_TIMER_1); |
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| 100 | |
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| 101 | /* Register the driver exit procedure so we can shutdown */ |
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| 102 | atexit(Clock_exit); |
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[00717a3] | 103 | } |
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| 104 | |
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| 105 | rtems_device_driver |
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| 106 | Clock_initialize(rtems_device_major_number major, |
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| 107 | rtems_device_minor_number minor, |
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| 108 | void *pargp) |
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| 109 | { |
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[40716bf] | 110 | Install_clock (Clock_isr); |
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[1857b00] | 111 | |
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[40716bf] | 112 | return RTEMS_SUCCESSFUL; |
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[00717a3] | 113 | } |
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