diff options
Diffstat (limited to 'c/src/lib/libbsp/i960/rxgen960/clock/ckinit.c')
-rw-r--r-- | c/src/lib/libbsp/i960/rxgen960/clock/ckinit.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i960/rxgen960/clock/ckinit.c b/c/src/lib/libbsp/i960/rxgen960/clock/ckinit.c new file mode 100644 index 0000000000..aebdb162b3 --- /dev/null +++ b/c/src/lib/libbsp/i960/rxgen960/clock/ckinit.c @@ -0,0 +1,187 @@ +/* Clock_init() + * + * This routine initializes the i960RP onboard timer + * The tick frequency is 1 millisecond; assuming 33MHz core + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * COPYRIGHT (c) 1989-1997. + * RAMiX Inc 1999 + * On-Line Applications Research Corporation (OAR). + * Copyright assigned to U.S. Government, 1994. + * + * The license and distribution terms for this file may in + * the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include <stdlib.h> + +#include <bsp.h> +#include <i960RP.h> +#include <rtems/libio.h> + +#define CLOCK_VECTOR 0x92 + +rtems_unsigned32 Clock_isrs; /* ISRs until next tick */ +rtems_unsigned32 Reload_Clock_isrs; + +i960_isr_entry Old_ticker; +rtems_unsigned32 Clock_driver_ticks; + /* ticks since initialization */ +unsigned int clock_isr_global[16]; /* place to store global regs */ + +void Clock_exit( void ); + +/* + * These are set by clock driver during its init + */ + +rtems_device_major_number rtems_clock_major = ~0; +rtems_device_minor_number rtems_clock_minor; + +/* this is later in the file to avoid it being inlined */ +rtems_isr Clock_isr( rtems_vector_number vector ); + +void Install_clock( + rtems_isr_entry clock_isr +) +{ + volatile unsigned int *tmr0 = (unsigned int *) TMR0_ADDR; + volatile unsigned int *trr0 = (unsigned int *) TRR0_ADDR; + volatile unsigned int *tcr0 = (unsigned int *) TCR0_ADDR; + volatile unsigned int *icon = (unsigned int *) ICON_ADDR; + volatile unsigned int *imap2 = (unsigned int *) IMAP2_ADDR; + volatile unsigned int *ipnd = (unsigned int *) IPND_ADDR; + volatile unsigned int *imsk = (unsigned int *) IMSK_ADDR; + void clockHandler(); + + + Clock_driver_ticks = 0; + Reload_Clock_isrs = BSP_Configuration.microseconds_per_tick / 1000; + Clock_isrs = Reload_Clock_isrs; + +/* Not for our case + if ( BSP_Configuration.ticks_per_timeslice ) { + *icon = 0x6000; + + Old_ticker = set_vector( (((unsigned int) clock_isr) | 0x2), CLOCK_VECTOR, 1 ); +*/ + #define BUS_CLOCK_1 0 + #define TMR_WRITE_CNTL 8 + #define TMR_AUTO_RELOAD 4 + #define TMR_ENABLE 2 + #define TMR_TERM_CNT_STAT 1 + + Old_ticker = set_vector( (((unsigned int) clock_isr) | 0x2), CLOCK_VECTOR, 1 ); +/* + *(unsigned int *)(CLOCK_VECTOR >>2) = (unsigned int )clockHandler; +*/ + + /* initialize the i960RP timer 0 here */ + + /* set the timer countdown (Assume 33MHz operation) */ + *trr0 = 30 * BSP_Configuration.microseconds_per_tick ; + *tcr0 = 30 * BSP_Configuration.microseconds_per_tick ; +/* +kkprintf("Load the timers with %x\n", 30 * BSP_Configuration.microseconds_per_tick / Reload_Clock_isrs); +*/ + + *tmr0 = BUS_CLOCK_1 | TMR_AUTO_RELOAD | TMR_ENABLE; +/* Unmask the interrupts */ + *ipnd &= ~(1 << 12); + *imsk |= 1 << 12; + +} + +void Clock_exit() +{ + volatile unsigned int *tmr0 = (unsigned int *) TMR0_ADDR; + + if ( BSP_Configuration.ticks_per_timeslice ) { + /* shut down the timer */ + *tmr0 = *tmr0 & ~TMR_ENABLE; + + i960_mask_intr( 12 ); + /* do not restore old vector */ + } +} + +rtems_device_driver Clock_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *pargp +) +{ + Install_clock( Clock_isr ); + + atexit( Clock_exit ); + + /* + * make major/minor avail to others such as shared memory driver + */ + + rtems_clock_major = major; + rtems_clock_minor = minor; + + return RTEMS_SUCCESSFUL; +} + +rtems_device_driver Clock_control( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *pargp +) +{ + rtems_unsigned32 isrlevel; + rtems_libio_ioctl_args_t *args = pargp; + + if (args == 0) + goto done; + + /* + * This is hokey, but until we get a defined interface + * to do this, it will just be this simple... + */ + + if (args->command == rtems_build_name('I', 'S', 'R', ' ')) + { + Clock_isr(CLOCK_VECTOR); + } + else if (args->command == rtems_build_name('N', 'E', 'W', ' ')) + { + rtems_interrupt_disable( isrlevel ); + (void) set_tmr_vector( args->buffer, CLOCK_VECTOR, 0 ); + rtems_interrupt_enable( isrlevel ); + } + +done: + return RTEMS_SUCCESSFUL; +} + +rtems_isr Clock_isr( + rtems_vector_number vector +) +{ + /* enable_tracing(); */ +#ifdef NOTMB + if ( Clock_isrs == 1 ) { + rtems_clock_tick(); + Clock_isrs = Reload_Clock_isrs; + } + else + { + Clock_isrs -= 1; + } +#else +*(int *)(0xfed00000) += 1; + rtems_clock_tick(); +#endif + + i960_clear_intr( 12 ); +} + |