diff options
Diffstat (limited to 'c/src/lib/libbsp/sh/simsh4/clock/ckinit.c')
| -rw-r--r-- | c/src/lib/libbsp/sh/simsh4/clock/ckinit.c | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/sh/simsh4/clock/ckinit.c b/c/src/lib/libbsp/sh/simsh4/clock/ckinit.c new file mode 100644 index 0000000000..4e07f09c49 --- /dev/null +++ b/c/src/lib/libbsp/sh/simsh4/clock/ckinit.c @@ -0,0 +1,189 @@ +/* + * Clock Driver for SH4 simulator (timer interrupt not supported now). + * + * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia + * Author: Victor V. Vengerov <vvv@oktet.ru> + * + * COPYRIGHT (c) 1989-2001. + * 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.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + +#include <stdlib.h> +#include <bsp.h> +#include <rtems/libio.h> + +/* + * Clock_driver_ticks is a monotonically increasing counter of the + * number of clock ticks since the driver was initialized. + */ +volatile rtems_unsigned32 Clock_driver_ticks; + + +/* + * These are set by clock driver during its init + */ + +rtems_device_major_number rtems_clock_major = ~0; +rtems_device_minor_number rtems_clock_minor; + +rtems_isr (*rtems_clock_hook)(rtems_vector_number) = NULL; + +static void +set_clock_period(rtems_unsigned32 period) +{ + asm volatile ("\tmov %0,r0\n" + "\ttrapa\t#4\n" + : + : "r" (period) + : "r0" ); +} + +/* Clock_isr -- + * This handles the timer interrupt by clearing the timer's interrupt + * flag and announcing the clock tick to the system. + * + * PARAMETERS: + * vector - timer interrupt vector number + * + * RETURNS: + * none + */ +rtems_isr +Clock_isr (rtems_vector_number vector) +{ + /* Announce the clock tick */ + Clock_driver_ticks++; + rtems_clock_tick(); +} + + +/* Clock_exit -- + * This shuts down the timer if it was enabled and removes it + * from the interrupt mask. + * + * PARAMETERS: + * none + * + * RETURNS: + * none + */ +void +Clock_exit(void) +{ + if (BSP_Configuration.ticks_per_timeslice) + { + /* disable all timer1 interrupts */ + set_clock_period(0); + } +} + + +/* Install_clock -- + * This initialises timer1 with the BSP timeslice config value + * as a reference and sets up the interrupt handler for clock ticks. + * + * PARAMETERS: + * clock_isr - clock interrupt handler routine + * + * RETURNS: + * none. + */ +static void +Install_clock(rtems_isr_entry clock_isr) +{ + rtems_unsigned32 period; + Clock_driver_ticks = 0; + if (BSP_Configuration.ticks_per_timeslice) + { + void *old_isr; + period = Cpu_table.clicks_per_second / + BSP_Configuration.ticks_per_timeslice; + + /* Configure timer interrupts */ + set_clock_period(period); + + /* Register the interrupt handler */ + rtems_interrupt_catch(clock_isr, CLOCK_VECTOR, &old_isr); + + /* Register the driver exit procedure so we can shutdown */ + atexit(Clock_exit); + } +} + + +/* Clock_initialize -- + * This is called to setup the clock driver. It calls the hardware + * setup function and make the driver major/minor values available + * for other. + * + * PARAMETERS: + * major - clock device major number + * minor - clock device minor number + * pargp - device driver initialization argument (not used) + * + * RETURNS: + * RTEMS status code + */ +rtems_device_driver +Clock_initialize(rtems_device_major_number major, + rtems_device_minor_number minor, + void *pargp) +{ + Install_clock (Clock_isr); + + /* Make major/minor avail to others such as shared memory driver */ + rtems_clock_major = major; + rtems_clock_minor = minor; + + return RTEMS_SUCCESSFUL; +} + + +/* Clock_control -- + * I/O control (IOCTL) function for Clock driver. At this moment this + * just runs the interrupt handler or re-registers the interrupt handler + * on request. + * + * PARAMETERS: + * major - clock major device number + * minor - clock minor device number + * pargp - pointer to IOCTL arguments + * + * RETURNS: + * RTEMS status code + */ +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) + { + void *old_isr; + /* + * 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 ); + rtems_interrupt_catch(Clock_isr, CLOCK_VECTOR, &old_isr); + rtems_interrupt_enable( isrlevel ); + } + } + return RTEMS_SUCCESSFUL; +} |