[3cfd520] | 1 | /* |
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| 2 | * Clock Driver for MCF5272 CPU |
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| 3 | * |
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| 4 | * This driver initailizes timer1 on the MCF5272 as the |
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| 5 | * main system clock |
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| 6 | * |
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| 7 | * Copyright 2004 Cogent Computer Systems |
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| 8 | * Author: Jay Monkman <jtm@lopingdog.com> |
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| 9 | * |
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| 10 | * Based on MCF5206 clock driver by |
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| 11 | * Victor V. Vengerov <vvv@oktet.ru> |
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| 12 | * |
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| 13 | * Based on work: |
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| 14 | * David Fiddes, D.J@fiddes.surfaid.org |
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| 15 | * http://www.calm.hw.ac.uk/davidf/coldfire/ |
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| 16 | * |
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| 17 | * COPYRIGHT (c) 1989-1998. |
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| 18 | * On-Line Applications Research Corporation (OAR). |
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| 19 | * |
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| 20 | * The license and distribution terms for this file may be |
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| 21 | * found in the file LICENSE in this distribution or at |
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| 22 | * |
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[df2837ff] | 23 | * http://www.rtems.com/license/LICENSE. |
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[3cfd520] | 24 | * |
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| 25 | * ckinit.c,v 1.1 2001/10/26 19:32:40 joel Exp |
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| 26 | */ |
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| 27 | |
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| 28 | #include <stdlib.h> |
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| 29 | #include <bsp.h> |
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| 30 | #include <rtems/libio.h> |
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| 31 | #include <mcf5272/mcf5272.h> |
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| 32 | |
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| 33 | /* |
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| 34 | * Clock_driver_ticks is a monotonically increasing counter of the |
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| 35 | * number of clock ticks since the driver was initialized. |
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| 36 | */ |
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[ee5769ad] | 37 | volatile uint32_t Clock_driver_ticks; |
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[3cfd520] | 38 | |
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| 39 | |
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| 40 | /* |
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| 41 | * These are set by clock driver during its init |
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| 42 | */ |
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| 43 | |
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| 44 | rtems_device_major_number rtems_clock_major = ~0; |
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| 45 | rtems_device_minor_number rtems_clock_minor; |
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| 46 | |
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| 47 | rtems_isr (*rtems_clock_hook)(rtems_vector_number) = NULL; |
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| 48 | |
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| 49 | /* Clock_isr -- |
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| 50 | * This handles the timer interrupt by clearing the timer's interrupt |
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| 51 | * flag and announcing the clock tick to the system. |
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| 52 | * |
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| 53 | * PARAMETERS: |
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| 54 | * vector - timer interrupt vector number |
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| 55 | |
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| 56 | * RETURNS: |
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| 57 | * none |
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| 58 | */ |
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| 59 | rtems_isr |
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| 60 | Clock_isr (rtems_vector_number vector) |
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| 61 | { |
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| 62 | /* Clear pending interrupt... */ |
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| 63 | g_timer_regs->ter1 = MCF5272_TER_REF | MCF5272_TER_CAP; |
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| 64 | |
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| 65 | /* Announce the clock tick */ |
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| 66 | Clock_driver_ticks++; |
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| 67 | rtems_clock_tick(); |
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| 68 | if (rtems_clock_hook != NULL) { |
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| 69 | rtems_clock_hook(vector); |
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| 70 | } |
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| 71 | } |
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| 72 | |
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| 73 | |
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| 74 | /* Clock_exit -- |
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| 75 | * This shuts down the timer if it was enabled and removes it |
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| 76 | * from the MCF5206E interrupt mask. |
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| 77 | * |
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| 78 | * PARAMETERS: |
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| 79 | * none |
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| 80 | * |
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| 81 | * RETURNS: |
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| 82 | * none |
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| 83 | */ |
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| 84 | void |
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| 85 | Clock_exit(void) |
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| 86 | { |
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[0f9ecc4e] | 87 | if (rtems_configuration_get_ticks_per_timeslice()) { |
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[ee5769ad] | 88 | uint32_t icr; |
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[3cfd520] | 89 | /* disable all timer1 interrupts */ |
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| 90 | icr = g_intctrl_regs->icr1; |
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| 91 | icr = icr & ~(MCF5272_ICR1_TMR1_MASK | MCF5272_ICR1_TMR1_PI); |
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| 92 | icr |= (MCF5272_ICR1_TMR1_IPL(0) | MCF5272_ICR1_TMR1_PI); |
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| 93 | g_intctrl_regs->icr1 = icr; |
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| 94 | |
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| 95 | /* reset timer1 */ |
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| 96 | g_timer_regs->tmr1 = MCF5272_TMR_CLK_STOP; |
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| 97 | |
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| 98 | /* clear pending */ |
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| 99 | g_timer_regs->ter1 = MCF5272_TER_REF | MCF5272_TER_CAP; |
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| 100 | } |
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| 101 | } |
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| 102 | |
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| 103 | |
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| 104 | /* Install_clock -- |
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| 105 | * This initialises timer1 with the BSP timeslice config value |
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| 106 | * as a reference and sets up the interrupt handler for clock ticks. |
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| 107 | * |
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| 108 | * PARAMETERS: |
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| 109 | * clock_isr - clock interrupt handler routine |
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| 110 | * |
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| 111 | * RETURNS: |
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| 112 | * none. |
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| 113 | */ |
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| 114 | static void |
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| 115 | Install_clock(rtems_isr_entry clock_isr) |
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| 116 | { |
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[0f9ecc4e] | 117 | uint32_t icr; |
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| 118 | Clock_driver_ticks = 0; |
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| 119 | if (rtems_configuration_get_ticks_per_timeslice()) { |
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| 120 | |
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| 121 | /* Register the interrupt handler */ |
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| 122 | set_vector(clock_isr, BSP_INTVEC_TMR1, 1); |
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| 123 | |
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| 124 | /* Reset timer 1 */ |
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| 125 | g_timer_regs->tmr1 = MCF5272_TMR_RST; |
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| 126 | g_timer_regs->tmr1 = MCF5272_TMR_CLK_STOP; |
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| 127 | g_timer_regs->tmr1 = MCF5272_TMR_RST; |
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| 128 | g_timer_regs->tcn1 = 0; /* reset counter */ |
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| 129 | g_timer_regs->ter1 = MCF5272_TER_REF | MCF5272_TER_CAP; |
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| 130 | |
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| 131 | /* Set Timer 1 prescaler so that it counts in microseconds */ |
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| 132 | g_timer_regs->tmr1 = ( |
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| 133 | ((((BSP_SYSTEM_FREQUENCY / 1000000) - 1) << MCF5272_TMR_PS_SHIFT) | |
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| 134 | MCF5272_TMR_CE_DISABLE | |
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| 135 | MCF5272_TMR_ORI | |
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| 136 | MCF5272_TMR_FRR | |
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| 137 | MCF5272_TMR_CLK_MSTR | |
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| 138 | MCF5272_TMR_RST)); |
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| 139 | |
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| 140 | /* Set the timer timeout value from the BSP config */ |
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| 141 | g_timer_regs->trr1 = rtems_configuration_get_microseconds_per_tick() - 1; |
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| 142 | |
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| 143 | /* Feed system frequency to the timer */ |
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| 144 | g_timer_regs->tmr1 |= MCF5272_TMR_CLK_MSTR; |
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| 145 | |
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| 146 | /* Configure timer1 interrupts */ |
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| 147 | icr = g_intctrl_regs->icr1; |
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| 148 | icr = icr & ~(MCF5272_ICR1_TMR1_MASK | MCF5272_ICR1_TMR1_PI); |
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| 149 | icr |= (MCF5272_ICR1_TMR1_IPL(BSP_INTLVL_TMR1) | MCF5272_ICR1_TMR1_PI); |
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| 150 | g_intctrl_regs->icr1 = icr; |
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| 151 | |
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| 152 | /* Register the driver exit procedure so we can shutdown */ |
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| 153 | atexit(Clock_exit); |
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| 154 | } |
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[3cfd520] | 155 | } |
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| 156 | |
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| 157 | |
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| 158 | /* Clock_initialize -- |
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| 159 | * This is called to setup the clock driver. It calls the hardware |
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| 160 | * setup function and make the driver major/minor values available |
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| 161 | * for other. |
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| 162 | * |
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| 163 | * PARAMETERS: |
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| 164 | * major - clock device major number |
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| 165 | * minor - clock device minor number |
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| 166 | * pargp - device driver initialization argument (not used) |
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| 167 | * |
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| 168 | * RETURNS: |
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| 169 | * RTEMS status code |
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| 170 | */ |
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| 171 | rtems_device_driver |
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| 172 | Clock_initialize(rtems_device_major_number major, |
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| 173 | rtems_device_minor_number minor, |
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| 174 | void *pargp) |
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| 175 | { |
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| 176 | Install_clock (Clock_isr); |
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| 177 | |
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| 178 | /* Make major/minor avail to others such as shared memory driver */ |
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| 179 | rtems_clock_major = major; |
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| 180 | rtems_clock_minor = minor; |
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| 181 | |
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| 182 | return RTEMS_SUCCESSFUL; |
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| 183 | } |
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