[1cfcfd3] | 1 | /* |
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| 2 | * MC9328MXL clock specific using the System Timer |
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[cf6bc1e] | 3 | */ |
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| 4 | |
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| 5 | /* |
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[1cfcfd3] | 6 | * Copyright (c) 2004 by Cogent Computer Systems |
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| 7 | * Written by Jay Monkman <jtm@lopingdog.com> |
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| 8 | * |
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| 9 | * The license and distribution terms for this file may be |
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| 10 | * found in the file LICENSE in this distribution or at |
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[c499856] | 11 | * http://www.rtems.org/license/LICENSE. |
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[bb9cf58d] | 12 | */ |
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| 13 | |
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[1cfcfd3] | 14 | #include <rtems.h> |
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| 15 | #include <bsp.h> |
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[f4dc319a] | 16 | #include <bsp/irq.h> |
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[1cfcfd3] | 17 | #include <mc9328mxl.h> |
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[aaca942] | 18 | #include <rtems/bspIo.h> /* for printk */ |
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[1cfcfd3] | 19 | |
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[052534c2] | 20 | /* this is defined in ../../../shared/clockdrv_shell.h */ |
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[bb9cf58d] | 21 | void Clock_isr(rtems_irq_hdl_param arg); |
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[1cfcfd3] | 22 | static void clock_isr_on(const rtems_irq_connect_data *unused); |
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| 23 | static void clock_isr_off(const rtems_irq_connect_data *unused); |
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| 24 | static int clock_isr_is_on(const rtems_irq_connect_data *irq); |
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| 25 | |
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| 26 | /* Replace the first value with the clock's interrupt name. */ |
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[7afe5a2] | 27 | rtems_irq_connect_data clock_isr_data = { |
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[bb9cf58d] | 28 | .name = BSP_INT_TIMER1, |
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| 29 | .hdl = Clock_isr, |
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| 30 | .handle = (void *)BSP_INT_TIMER1, |
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| 31 | .on = clock_isr_on, |
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| 32 | .off = clock_isr_off, |
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| 33 | .isOn = clock_isr_is_on, |
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[7afe5a2] | 34 | }; |
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[1cfcfd3] | 35 | |
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| 36 | /** |
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| 37 | * When we get the clock interrupt |
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| 38 | * - clear the interrupt bit? |
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| 39 | * - restart the timer? |
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| 40 | */ |
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[cf6bc1e] | 41 | #define Clock_driver_support_at_tick() \ |
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| 42 | do { \ |
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| 43 | uint32_t reg; \ |
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| 44 | \ |
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| 45 | reg = MC9328MXL_TMR1_TSTAT; \ |
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| 46 | (void) reg; /* avoid set but not used warning */ \ |
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| 47 | MC9328MXL_TMR1_TSTAT = 0; \ |
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[1cfcfd3] | 48 | } while(0) |
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| 49 | |
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| 50 | /** |
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| 51 | * Installs the clock ISR. You shouldn't need to change this. |
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| 52 | */ |
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[f3b29236] | 53 | #define Clock_driver_support_install_isr( _new ) \ |
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| 54 | BSP_install_rtems_irq_handler(&clock_isr_data) |
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[1cfcfd3] | 55 | |
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| 56 | /** |
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| 57 | * Initialize the hardware for the clock |
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| 58 | * - Set the frequency |
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| 59 | * - enable it |
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| 60 | * - clear any pending interrupts |
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| 61 | * |
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[359e537] | 62 | * Since you may want the clock always running, you can |
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[1cfcfd3] | 63 | * enable interrupts here. If you do so, the clock_isr_on(), |
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[359e537] | 64 | * clock_isr_off(), and clock_isr_is_on() functions can be |
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[1cfcfd3] | 65 | * NOPs. |
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| 66 | */ |
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| 67 | #define Clock_driver_support_initialize_hardware() \ |
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| 68 | do { \ |
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| 69 | int freq; \ |
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| 70 | int cnt; \ |
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| 71 | freq = get_perclk1_freq(); \ |
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| 72 | printk("perclk1 freq is %d\n", freq); \ |
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[35f1d89] | 73 | cnt = ((long long)freq * rtems_configuration_get_microseconds_per_tick() + 500000) / 1000000;\ |
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[1cfcfd3] | 74 | printk("cnt freq is %d\n", cnt); \ |
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| 75 | MC9328MXL_TMR1_TCMP = cnt; \ |
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| 76 | /* use PERCLK1 as input, enable timer */ \ |
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| 77 | MC9328MXL_TMR1_TCTL = (MC9328MXL_TMR_TCTL_CLKSRC_PCLK1 | \ |
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| 78 | MC9328MXL_TMR_TCTL_TEN | \ |
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| 79 | MC9328MXL_TMR_TCTL_IRQEN); \ |
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| 80 | /* set prescaler to 1 (register value + 1) */ \ |
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| 81 | MC9328MXL_TMR1_TPRER = 0; \ |
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| 82 | } while (0) |
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| 83 | |
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| 84 | /** |
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[359e537] | 85 | * Do whatever you need to shut the clock down and remove the |
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[1cfcfd3] | 86 | * interrupt handler. Since this normally only gets called on |
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| 87 | * RTEMS shutdown, you may not need to do anything other than |
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| 88 | * remove the ISR. |
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| 89 | */ |
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| 90 | #define Clock_driver_support_shutdown_hardware() \ |
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| 91 | do { \ |
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[bb9cf58d] | 92 | /* Disable timer */ \ |
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| 93 | MC9328MXL_TMR1_TCTL = 0; \ |
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| 94 | BSP_remove_rtems_irq_handler(&clock_isr_data); \ |
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| 95 | } while (0) |
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[1cfcfd3] | 96 | |
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| 97 | /** |
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| 98 | * Enables clock interrupt. |
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| 99 | * |
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| 100 | * If the interrupt is always on, this can be a NOP. |
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| 101 | */ |
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| 102 | static void clock_isr_on(const rtems_irq_connect_data *unused) |
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| 103 | { |
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[bb9cf58d] | 104 | MC9328MXL_TMR1_TCTL |= MC9328MXL_TMR_TCTL_IRQEN; |
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| 105 | MC9328MXL_AITC_INTENNUM = MC9328MXL_INT_TIMER1; |
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[1cfcfd3] | 106 | } |
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| 107 | |
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| 108 | /** |
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| 109 | * Disables clock interrupts |
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| 110 | * |
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| 111 | * If the interrupt is always on, this can be a NOP. |
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| 112 | */ |
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| 113 | static void clock_isr_off(const rtems_irq_connect_data *unused) |
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| 114 | { |
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[bb9cf58d] | 115 | MC9328MXL_TMR1_TCTL &= ~MC9328MXL_TMR_TCTL_IRQEN; |
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| 116 | MC9328MXL_AITC_INTDISNUM = MC9328MXL_INT_TIMER1; |
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[1cfcfd3] | 117 | } |
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| 118 | |
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| 119 | /** |
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| 120 | * Tests to see if clock interrupt is enabled, and returns 1 if so. |
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| 121 | * If interrupt is not enabled, returns 0. |
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| 122 | * |
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| 123 | * If the interrupt is always on, this always returns 1. |
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| 124 | */ |
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| 125 | static int clock_isr_is_on(const rtems_irq_connect_data *irq) |
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| 126 | { |
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[bb9cf58d] | 127 | return MC9328MXL_TMR1_TCTL & MC9328MXL_TMR_TCTL_IRQEN; |
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[1cfcfd3] | 128 | } |
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| 129 | |
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[75acd9e] | 130 | #define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER |
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| 131 | |
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[1cfcfd3] | 132 | /* Make sure to include this, and only at the end of the file */ |
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[75acd9e] | 133 | |
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[052534c2] | 134 | #include "../../../../libbsp/shared/clockdrv_shell.h" |
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