diff options
Diffstat (limited to 'bsps/m68k/genmcf548x/clock/clock.c')
| -rw-r--r-- | bsps/m68k/genmcf548x/clock/clock.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/bsps/m68k/genmcf548x/clock/clock.c b/bsps/m68k/genmcf548x/clock/clock.c new file mode 100644 index 0000000000..68b7c5f61b --- /dev/null +++ b/bsps/m68k/genmcf548x/clock/clock.c @@ -0,0 +1,102 @@ +/*===============================================================*\ +| Project: RTEMS generic mcf548x BSP | ++-----------------------------------------------------------------+ +| File: clock.c | ++-----------------------------------------------------------------+ +| The file contains the clock driver code of generic MCF548x BSP. | ++-----------------------------------------------------------------+ +| Copyright (c) 2007 | +| Embedded Brains GmbH | +| Obere Lagerstr. 30 | +| D-82178 Puchheim | +| Germany | +| rtems@embedded-brains.de | ++-----------------------------------------------------------------+ +| | +| Parts of the code has been derived from the "dBUG source code" | +| package Freescale is providing for M548X EVBs. The usage of | +| the modified or unmodified code and it's integration into the | +| generic mcf548x BSP has been done according to the Freescale | +| license terms. | +| | +| The Freescale license terms can be reviewed in the file | +| | +| Freescale_license.txt | +| | ++-----------------------------------------------------------------+ +| | +| The generic mcf548x BSP has been developed on the basic | +| structures and modules of the av5282 BSP. | +| | ++-----------------------------------------------------------------+ +| | +| 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. | +| | ++-----------------------------------------------------------------+ +| | +| date history ID | +| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | +| 12.11.07 1.0 ras | +| | +\*===============================================================*/ + +/* + * Use first slice timer (SLT0) as the system clock. + * + */ + +#include <rtems.h> +#include <bsp.h> +#include <bsp/irq-generic.h> +#include <mcf548x/mcf548x.h> + +/* + * Use SLT 0 + */ +#define CLOCK_IRQ MCF548X_IRQ_SLT0 + +/* + * Periodic interval timer interrupt handler + */ +#define Clock_driver_support_at_tick() \ + do { \ + MCF548X_SLT_SSR0 = MCF548X_SLT_SSR_ST; \ + } while (0) \ + +/* + * Attach clock interrupt handler + */ +#define Clock_driver_support_install_isr( _new ) \ + set_vector(_new, CLOCK_IRQ + 64, 1) + +/* + * Turn off the clock + */ +#define Clock_driver_support_shutdown_hardware() \ + do { \ + MCF548X_SLT_SCR0 &= ~(MCF548X_SLT_SCR_TEN | MCF548X_SLT_SCR_RUN | MCF548X_SLT_SCR_IEN); \ + } while(0) + +/* + * Set up the clock hardware + * + * We need to have 1 interrupt every 10,000 microseconds + * XLB clock 100 MHz / MCF548X_SLT_SLTCNT0 = XLB clock/100 + */ +#define Clock_driver_support_initialize_hardware() \ + do { \ + bsp_interrupt_vector_enable(CLOCK_IRQ); \ + MCF548X_SLT_SLTCNT0 = get_CPU_clock_speed() \ + / 1000 \ + * rtems_configuration_get_microseconds_per_tick() \ + / 1000; \ + MCF548X_SLT_SCR0 |= (MCF548X_SLT_SCR_TEN | MCF548X_SLT_SCR_RUN | MCF548X_SLT_SCR_IEN); \ + } while (0) + +#define CLOCK_DRIVER_USE_DUMMY_TIMECOUNTER + +#include "../../../shared/dev/clock/clockimpl.h" + |