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Diffstat (limited to 'bsps/m68k/genmcf548x/start/bspstart.c')
| -rw-r--r-- | bsps/m68k/genmcf548x/start/bspstart.c | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/bsps/m68k/genmcf548x/start/bspstart.c b/bsps/m68k/genmcf548x/start/bspstart.c new file mode 100644 index 0000000000..6c1da2a738 --- /dev/null +++ b/bsps/m68k/genmcf548x/start/bspstart.c @@ -0,0 +1,206 @@ +/*===============================================================*\ +| Project: RTEMS generic mcf548x BSP | ++-----------------------------------------------------------------+ +| File: bspstart.c | ++-----------------------------------------------------------------+ +| The file contains the startup 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 | +| | +\*===============================================================*/ + +#include <bsp.h> +#include <bsp/bootcard.h> + +extern uint32_t _CPU_cacr_shadow; + +/* +* These labels (!) are defined in the linker command file or when the linker is +* invoked. +* NOTE: The information (size) is the address of the object, not the object +* itself. +*/ + +extern char _SdramBase[]; +extern char _BootFlashBase[]; +extern char _CodeFlashBase[]; +extern char _SdramSize[]; +extern char _BootFlashSize[]; +extern char _CodeFlashSize[]; +extern char _TopRamReserved []; +extern char WorkAreaBase []; + +/* + * CPU-space access + */ +#define m68k_set_acr2(_acr2) __asm__ volatile ("movec %0,#0x0005" : : "d" (_acr2)) +#define m68k_set_acr3(_acr3) __asm__ volatile ("movec %0,#0x0007" : : "d" (_acr3)) + +/* + * Set initial CACR mode, mainly enables branch/instruction/data cache. The + * FPU must be switched on in the BSP startup code since the + * _Thread_Start_multitasking() will restore the floating-point context of the + * initialization task if necessary. + */ +static const uint32_t BSP_CACR_INIT = MCF548X_CACR_DEC /* enable data cache */ + | MCF548X_CACR_BEC /* enable branch cache */ + | MCF548X_CACR_IEC /* enable instruction cache */ + | MCF548X_CACR_DDCM(DCACHE_ON_WRIGHTTHROUGH) + /* set data cache mode to write-through */ + | MCF548X_CACR_DESB /* enable data store buffer */ + | MCF548X_CACR_DDSP /* data access only in supv. mode */ + | MCF548X_CACR_IDSP; /* instr. access only in supv. mode */ + +/* + * CACR maintenance functions + */ + +void bsp_cacr_set_flags( uint32_t flags) +{ + rtems_interrupt_level level; + + rtems_interrupt_disable( level); + _CPU_cacr_shadow |= flags; + m68k_set_cacr( _CPU_cacr_shadow); + rtems_interrupt_enable( level); +} + +void bsp_cacr_set_self_clear_flags( uint32_t flags) +{ + rtems_interrupt_level level; + uint32_t cacr = 0; + + rtems_interrupt_disable( level); + cacr = _CPU_cacr_shadow | flags; + m68k_set_cacr( cacr); + rtems_interrupt_enable( level); +} + +void bsp_cacr_clear_flags( uint32_t flags) +{ + rtems_interrupt_level level; + + rtems_interrupt_disable( level); + _CPU_cacr_shadow &= ~flags; + m68k_set_cacr( _CPU_cacr_shadow); + rtems_interrupt_enable( level); +} + +/* + * Coldfire acr and mmu settings + */ + static void acr_mmu_mapping(void) + { + + /* + * Cache disabled for internal register area (256 kB). + * Choose the smallest maskable size of 1MB. + */ + m68k_set_acr0(MCF548X_ACR_BA((uint32_t)(__MBAR)) | + MCF548X_ACR_ADMSK_AMM((uint32_t)(0xFFFFF)) | + MCF548X_ACR_E | + MCF548X_ACR_SP /* supervisor protection */ | + MCF548X_ACR_S(S_ACCESS_SUPV) /* always in supervisor mode */ | + MCF548X_ACR_CM(CM_OFF_PRECISE)); + +#ifdef M5484FIREENGINE + + + /* + * Cache enabled for entire SDRAM (64 MB) + */ + m68k_set_acr1(MCF548X_ACR_BA((uint32_t)(_SdramBase)) | + MCF548X_ACR_ADMSK_AMM((uint32_t)(_SdramSize - 1)) | + MCF548X_ACR_E | + MCF548X_ACR_SP /* supervisor protection */ | + MCF548X_ACR_S(S_ACCESS_SUPV) /* always in supervisor mode */ | + MCF548X_ACR_CM(CM_ON_WRIGHTTHROUGH)); + + /* + * Cache enabled for entire boot flash (2 MB) + */ + m68k_set_acr2(MCF548X_ACR_BA((uint32_t)(_BootFlashBase)) | + MCF548X_ACR_ADMSK_AMM((uint32_t)(_BootFlashSize - 1)) | + MCF548X_ACR_E | + MCF548X_ACR_SP /* supervisor protection */ | + MCF548X_ACR_S(S_ACCESS_SUPV) /* always in supervisor mode */ | + MCF548X_ACR_CM(CM_ON_COPYBACK)); + + /* + * Cache enabled for entire code flash (16 MB) + */ + m68k_set_acr3(MCF548X_ACR_BA((uint32_t)(_CodeFlashBase)) | + MCF548X_ACR_ADMSK_AMM((uint32_t)(_CodeFlashSize - 1)) | + MCF548X_ACR_E | + MCF548X_ACR_SP /* supervisor protection */ | + MCF548X_ACR_S(S_ACCESS_SUPV) /* always in supervisor mode */ | + MCF548X_ACR_CM(CM_ON_COPYBACK)); +#endif + + } + +/* + * bsp_start + * + * This routine does the bulk of the system initialisation. + */ +void bsp_start( void ) +{ + /* Initialize CACR shadow register */ + _CPU_cacr_shadow = BSP_CACR_INIT; + + /* + * Load the shadow variable of CACR with initial mode and write it to the + * CACR. Interrupts are still disabled, so there is no need for surrounding + * rtems_interrupt_enable() / rtems_interrupt_disable(). + */ + m68k_set_cacr( _CPU_cacr_shadow); + + /* + * do mapping of acr's and/or mmu + */ + acr_mmu_mapping(); +} + + +/* + * Get the XLB clock speed + */ +uint32_t get_CPU_clock_speed(void) +{ + return (uint32_t)BSP_CPU_CLOCK_SPEED; +} |