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| author | Thomas Doerfler <Thomas.Doerfler@embedded-brains.de> | 2008-07-11 10:00:41 +0000 |
|---|---|---|
| committer | Thomas Doerfler <Thomas.Doerfler@embedded-brains.de> | 2008-07-11 10:00:41 +0000 |
| commit | 69effbb4e16db7e6c85cd9b2bb8ad648c700b0a6 (patch) | |
| tree | 342616a26286d7378fdde5acdafe923003d0aa76 /c/src/lib/libbsp/m68k/genmcf548x/clock | |
| parent | added mcf548x BSP support (diff) | |
| download | rtems-69effbb4e16db7e6c85cd9b2bb8ad648c700b0a6.tar.bz2 | |
added variant to gen68360 BSP
added genmcf548x BSP
Diffstat (limited to 'c/src/lib/libbsp/m68k/genmcf548x/clock')
| -rw-r--r-- | c/src/lib/libbsp/m68k/genmcf548x/clock/clock.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/genmcf548x/clock/clock.c b/c/src/lib/libbsp/m68k/genmcf548x/clock/clock.c new file mode 100644 index 0000000000..47738b5cc2 --- /dev/null +++ b/c/src/lib/libbsp/m68k/genmcf548x/clock/clock.c @@ -0,0 +1,104 @@ +/*===============================================================*\ +| 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.com/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 <mcf548x/mcf548x.h> + +/* + * Use SLT 0 + */ +#define CLOCK_VECTOR (64+54) + +/* + * 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, _old ) \ + do { \ + _old = (rtems_isr_entry)set_vector(_new, CLOCK_VECTOR, 1); \ + } while(0) + +/* + * 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 { \ + int level; \ + MCF548X_INTC_ICR54 = MCF548X_INTC_ICRn_IL(SLT0_IRQ_LEVEL) | \ + MCF548X_INTC_ICRn_IP(SLT0_IRQ_PRIORITY); \ + rtems_interrupt_disable( level ); \ + MCF548X_INTC_IMRH &= ~(MCF548X_INTC_IMRH_INT_MASK54 | \ + MCF548X_INTC_IMRL_MASKALL); \ + rtems_interrupt_enable( level ); \ + MCF548X_SLT_SLTCNT0 = get_CPU_clock_speed()/100; \ + MCF548X_SLT_SCR0 |= (MCF548X_SLT_SCR_TEN | MCF548X_SLT_SCR_RUN | MCF548X_SLT_SCR_IEN); \ + } while (0) + +#include "../../../shared/clockdrv_shell.c" + |