forked from Imagelibrary/rtems
2001-10-26 Victor V. Vengerov <vvv@oktet.ru>
* New libcpu support for mcf5206e. * ChangeLog, clock/ckinit.c, clock/.cvsignore, configure.ac, console/mcfuart.c, console/.cvsignore, include/mcf5206e.h, include/mcfmbus.h, include/mcfuart.h, include/.cvsignore, mbus/mcfmbus.c, mbus/.cvsignore, timer/timer.c, timer/timerisr.S, timer/.cvsignore, .cvsignore: New files.
This commit is contained in:
Joel Sherrill
218
c/src/lib/libcpu/m68k/mcf5206/clock/ckinit.c
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218
c/src/lib/libcpu/m68k/mcf5206/clock/ckinit.c
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/*
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* Clock Driver for MCF5206eLITE board
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*
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* This driver initailizes timer1 on the MCF5206E as the
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* main system clock
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*
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* Author: Victor V. Vengerov <vvv@oktet.ru>
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*
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* Based on work:
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* David Fiddes, D.J@fiddes.surfaid.org
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* http://www.calm.hw.ac.uk/davidf/coldfire/
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*
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* COPYRIGHT (c) 1989-1998.
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* On-Line Applications Research Corporation (OAR).
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* Copyright assigned to U.S. Government, 1994.
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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*
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* http://www.OARcorp.com/rtems/license.html.
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*
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* $Id$
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*/
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#include <stdlib.h>
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#include <bsp.h>
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#include <rtems/libio.h>
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#include "mcf5206/mcf5206e.h"
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/*
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* Clock_driver_ticks is a monotonically increasing counter of the
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* number of clock ticks since the driver was initialized.
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*/
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volatile rtems_unsigned32 Clock_driver_ticks;
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/*
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* These are set by clock driver during its init
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*/
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rtems_device_major_number rtems_clock_major = ~0;
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rtems_device_minor_number rtems_clock_minor;
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rtems_isr (*rtems_clock_hook)(rtems_vector_number) = NULL;
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/* Clock_isr --
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* This handles the timer interrupt by clearing the timer's interrupt
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* flag and announcing the clock tick to the system.
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*
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* PARAMETERS:
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* vector - timer interrupt vector number
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*
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* RETURNS:
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* none
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*/
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rtems_isr
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Clock_isr (rtems_vector_number vector)
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{
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/* Clear pending interrupt... */
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*MCF5206E_TER(MBAR,1) = MCF5206E_TER_REF | MCF5206E_TER_CAP;
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/* Announce the clock tick */
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Clock_driver_ticks++;
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rtems_clock_tick();
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if (rtems_clock_hook != NULL)
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rtems_clock_hook(vector);
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}
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/* Clock_exit --
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* This shuts down the timer if it was enabled and removes it
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* from the MCF5206E interrupt mask.
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*
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* PARAMETERS:
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* none
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*
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* RETURNS:
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* none
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*/
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void
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Clock_exit(void)
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{
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if (BSP_Configuration.ticks_per_timeslice)
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{
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/* disable all timer1 interrupts */
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*MCF5206E_IMR(MBAR) |= MCF5206E_INTR_BIT(MCF5206E_INTR_TIMER_1);
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/* reset timer1 */
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*MCF5206E_TMR(MBAR,1) = MCF5206E_TMR_ICLK_STOP;
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/* clear pending */
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*MCF5206E_TER(MBAR,1) = MCF5206E_TER_REF | MCF5206E_TER_CAP;
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}
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}
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/* Install_clock --
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* This initialises timer1 with the BSP timeslice config value
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* as a reference and sets up the interrupt handler for clock ticks.
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*
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* PARAMETERS:
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* clock_isr - clock interrupt handler routine
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*
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* RETURNS:
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* none.
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*/
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static void
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Install_clock(rtems_isr_entry clock_isr)
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{
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Clock_driver_ticks = 0;
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if (BSP_Configuration.ticks_per_timeslice)
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{
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/* Configure timer1 interrupts */
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*MCF5206E_ICR(MBAR,MCF5206E_INTR_TIMER_1) =
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MCF5206E_ICR_AVEC |
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((BSP_INTLVL_TIMER1 << MCF5206E_ICR_IL_S) & MCF5206E_ICR_IL) |
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((BSP_INTPRIO_TIMER1 << MCF5206E_ICR_IP_S) & MCF5206E_ICR_IP);
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/* Register the interrupt handler */
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set_vector(clock_isr, BSP_INTVEC_TIMER1, 1);
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/* Reset timer 1 */
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*MCF5206E_TMR(MBAR, 1) = MCF5206E_TMR_RST;
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*MCF5206E_TMR(MBAR, 1) = MCF5206E_TMR_ICLK_STOP;
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*MCF5206E_TMR(MBAR, 1) = MCF5206E_TMR_RST;
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*MCF5206E_TCN(MBAR, 1) = 0; /* Reset counter */
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*MCF5206E_TER(MBAR, 1) = MCF5206E_TER_REF | MCF5206E_TER_CAP;
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/* Set Timer 1 prescaler so that it counts in microseconds */
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*MCF5206E_TMR(MBAR, 1) =
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(((BSP_SYSTEM_FREQUENCY/1000000 - 1) << MCF5206E_TMR_PS_S) &
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MCF5206E_TMR_PS) |
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MCF5206E_TMR_CE_NONE | MCF5206E_TMR_ORI | MCF5206E_TMR_FRR |
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MCF5206E_TMR_RST;
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/* Set the timer timeout value from the BSP config */
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*MCF5206E_TRR(MBAR, 1) = BSP_Configuration.microseconds_per_tick - 1;
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/* Feed system frequency to the timer */
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*MCF5206E_TMR(MBAR, 1) |= MCF5206E_TMR_ICLK_MSCLK;
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/* Enable timer 1 interrupts */
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*MCF5206E_IMR(MBAR) &= ~MCF5206E_INTR_BIT(MCF5206E_INTR_TIMER_1);
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/* Register the driver exit procedure so we can shutdown */
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atexit(Clock_exit);
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}
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}
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/* Clock_initialize --
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* This is called to setup the clock driver. It calls the hardware
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* setup function and make the driver major/minor values available
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* for other.
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*
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* PARAMETERS:
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* major - clock device major number
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* minor - clock device minor number
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* pargp - device driver initialization argument (not used)
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*
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* RETURNS:
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* RTEMS status code
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*/
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rtems_device_driver
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Clock_initialize(rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp)
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{
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Install_clock (Clock_isr);
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/* Make major/minor avail to others such as shared memory driver */
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rtems_clock_major = major;
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rtems_clock_minor = minor;
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return RTEMS_SUCCESSFUL;
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}
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/* Clock_control --
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* I/O control (IOCTL) function for Clock driver. At this moment this
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* just runs the interrupt handler or re-registers the interrupt handler
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* on request.
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*
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* PARAMETERS:
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* major - clock major device number
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* minor - clock minor device number
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* pargp - pointer to IOCTL arguments
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*
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* RETURNS:
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* RTEMS status code
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*/
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rtems_device_driver
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Clock_control(rtems_device_major_number major,
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rtems_device_minor_number minor,
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void *pargp)
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{
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rtems_unsigned32 isrlevel;
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rtems_libio_ioctl_args_t *args = pargp;
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if (args)
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{
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/*
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* This is hokey, but until we get a defined interface
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* to do this, it will just be this simple...
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*/
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if (args->command == rtems_build_name('I', 'S', 'R', ' '))
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{
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Clock_isr(BSP_INTVEC_TIMER1);
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}
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else if (args->command == rtems_build_name('N', 'E', 'W', ' '))
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{
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rtems_interrupt_disable( isrlevel );
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(void) set_vector( args->buffer, BSP_INTVEC_TIMER1, 1 );
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rtems_interrupt_enable( isrlevel );
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}
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}
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return RTEMS_SUCCESSFUL;
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}
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