diff options
Diffstat (limited to 'c/src/lib/libbsp/m68k/mvme167/clock/ckinit.c')
| -rw-r--r-- | c/src/lib/libbsp/m68k/mvme167/clock/ckinit.c | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/c/src/lib/libbsp/m68k/mvme167/clock/ckinit.c b/c/src/lib/libbsp/m68k/mvme167/clock/ckinit.c deleted file mode 100644 index 8ae7234b8f..0000000000 --- a/c/src/lib/libbsp/m68k/mvme167/clock/ckinit.c +++ /dev/null @@ -1,159 +0,0 @@ -/* - * Implementation of the Clock_initialize() functions - * prototyped in rtems/c/src/lib/include/clockdrv.h. - * - * This port does not allow the application to select which timer on the - * MVME167 to use for the clock, nor does it allow the application to - * configure the clock. The clock uses the VMEchip2 Tick Timer #2. This - * timer is set up to raise a MC680x0 level-6 interrupt every 1 ms. The - * interrupt vector is 0x69. - * - * All page references are to the MVME166/MVME167/MVME187 Single Board - * Computer Programmer's Reference Guide (MVME187PG/D2) with the April - * 1993 supplements/addenda (MVME187PG/D2A1). - */ - -/* - * COPYRIGHT (c) 1989-1999. - * On-Line Applications Research Corporation (OAR). - * - * The license and distribution terms for this file may be - * found in the file LICENSE in this distribution or at - * http://www.rtems.org/license/LICENSE. - * - * Modifications of respective RTEMS files: - * Copyright (c) 1998, National Research Council of Canada - */ - -#include <stdlib.h> -#include <bsp.h> -#include <rtems/clockdrv.h> - -#define MS_COUNT 1000 /* T2's countdown constant (1 ms) */ -#define CLOCK_INT_LEVEL 6 /* T2's interrupt level */ -#define CLOCK_VECTOR (VBR0 * 0x10 + 0x9) /* T2 is vector $X9 (p. 2-71)*/ - -/* - * Clock_driver_ticks is a monotonically increasing counter of the number of - * VMEchip2 timer #2 ticks since the driver was initialized. - */ -volatile uint32_t Clock_driver_ticks; - -/* - * Clock_isrs is the number of clock ISRs until the next invocation of the - * RTEMS clock tick routine. This clock tick device driver gets an interrupt - * once a millisecond and counts down until the length of time between the - * user configured microseconds per tick has passed. This allows the clock - * device to "tick" faster than the kernel clock. Of course, the kernel clock - * cannot tick faster than the hardware clock. Therefore, the kernel clock - * ticks cannot occur more frequently than every 1 millisecond. - */ -uint32_t Clock_isrs; - -/* - * Records the previous clock ISR (should be NULL) - */ -rtems_isr_entry Old_ticker; - -/* - * Called when the kernel exits. - */ -void clock_exit( void ); - -/* - * VMEchip2_T2_isr - * - * C ISR Handler. Increment the number of internal ticks. If it is time for a - * kernel clock tick (if Clock_isrs == 1), call rtems_clock_tick() to signal - * the event and reset the Clock_isrs counter; else, just decrement it. - */ -static rtems_isr VMEchip2_T2_isr( - rtems_vector_number vector -) -{ - char overflow; /* Content of overflow counter */ - long i; - long ct; /* Number of T2 ticks per RTEMS ticks */ - - ct = rtems_configuration_get_microseconds_per_tick() / 1000; - - /* - * May have missed interrupts, so should look at the overflow counter. - */ - lcsr->intr_clear |= 0x02000000; /* Clear the interrupt */ - overflow = (lcsr->board_ctl >> 12) & 0xF; - lcsr->board_ctl |= 0x400; /* Reset overflow counter */ - - /* Attempt to protect against one more period */ - if ( overflow == 0 ) - overflow = 16; - - Clock_driver_ticks += overflow; /* One or more internal ticks */ - - if ( Clock_isrs <= overflow ) { - /* If its time for kernel clock ticks, signal the events to RTEMS */ - for( i = overflow - Clock_isrs; i >= 0; i -= ct ) { - rtems_clock_tick(); - } - /* Reset the counter */ - Clock_isrs = (uint32_t)-i; - } - else - Clock_isrs -= overflow; -} - -/* - * VMEchip2_T2_initialize - * - * Initialize the VMEchip2 Tick Timer #2. - * - * THE VMECHIP2 PRESCALER REGISTER IS ASSUMED TO BE SET! - * The prescaler is used by all VMEchip2 timers, including the VMEbus grant - * timeout counter, the DMAC time off timer, the DMAC timer on timer, and the - * VMEbus global timeout timer. The prescaler value is normally set by the - * boot ROM to provide a 1 MHz clock to the timers. For a 25 MHz MVME167, the - * prescaler value should be 0xE7 (page 2-63). - */ -static void VMEchip2_T2_initialize( void ) -{ - Clock_driver_ticks = 0; - Clock_isrs = rtems_configuration_get_microseconds_per_tick() / 1000; - - lcsr->intr_ena &= 0xFDFFFFFF; /* Disable tick timer 2 interrupt */ - lcsr->intr_clear = 0x02000000; /* Clear tick timer 2 interrupt */ - lcsr->intr_level[0] = /* Set tick timer 2 interrupt level */ - (lcsr->intr_level[0] & 0xFFFFFF0F ) | (CLOCK_INT_LEVEL << 4); - lcsr->timer_cmp_2 = MS_COUNT; /* Period in compare register */ - lcsr->timer_cnt_2 = 0; /* Clear tick timer 2 counter */ - Old_ticker = /* Install C ISR */ - (rtems_isr_entry) set_vector( VMEchip2_T2_isr, CLOCK_VECTOR, 1 ); - lcsr->board_ctl |= 0x700; /* Start tick timer 2, reset-on-compare, */ - /* and clear tick timer 2 overflow counter */ - lcsr->intr_ena |= 0x02000000; /* Enable tick timer 2 interrupt */ - lcsr->vector_base |= 0x00800000;/* Unmask VMEchip2 interrupts */ - atexit( clock_exit ); /* Turn off T2 interrupts when we exit */ -} - -/* - * This routine stops the VMEchip2 T2 timer, disables its interrupt, and - * re-install the old interrupt vectors. - */ -void clock_exit( void ) -{ - lcsr->board_ctl &= 0xFFFFFEFF; /* Stop tick timer 2 */ - lcsr->intr_ena &= 0xFDFFFFFF; /* Disable tick timer 2 interrupt */ - lcsr->intr_clear = 0x02000000; /* Clear tick timer 2 interrupt */ - - set_vector( Old_ticker, CLOCK_VECTOR, 1 ); -} - -rtems_device_driver Clock_initialize( - rtems_device_major_number major, - rtems_device_minor_number minor, - void *pargp -) -{ - VMEchip2_T2_initialize(); - - return RTEMS_SUCCESSFUL; -} |