PLL-sysclk.zip_飞思卡尔 32

/* * * FILE : MPC5516_HWInit.c * * DESCRIPTION: * This file contains all MPC5516 derivative needed initializations, * and all initializations for the MPC5516 boards which are supported. * This includes setting up the External Bus Interface to allow access * to memory on the external bus, and ensuring there is a valid entry in * the MMU for the external memory access. */ /*----------------------------------------------------------------------------*/ /* Includes */ /*----------------------------------------------------------------------------*/ #include "MPC5516.h" /* MPC55xx platform development header */ #include "MPC5516_HWInit.h" #ifdef __cplusplus extern "C" { #endif /*******************************************************/ /* MPC5516 derivative specific hardware initialization */ /*******************************************************/ /* Symbol L2SRAM_LOCATION is defined in the application linker command file (.lcf) It is defined to the start of the L2SRAM of the MPC5516. */ /*lint -esym(752, L2SRAM_LOCATION) */ extern long L2SRAM_LOCATION; __asm void INIT_Derivative(void) { nofralloc /* MPC5516 L2SRAM initialization code */ lis r11,L2SRAM_LOCATION@h /* Base address of the L2SRAM, 64-bit word aligned */ ori r11,r11,L2SRAM_LOCATION@l li r12,512 /* Loop counter to get all of L2SRAM; 64k/4 bytes/32 GPRs = 512 */ mtctr r12 init_l2sram_loop: stmw r0,0(r11) /* Write all 32 GPRs to L2SRAM */ addi r11,r11,128 /* Inc the ram ptr; 32 GPRs * 4 bytes = 128 */ bdnz init_l2sram_loop /* Loop for 64k of L2SRAM */ blr } /*******************************************************/ /* MPC5516 boards specific hardware initializations */ /*******************************************************/ /** This macro allows to use C defined address with the inline assembler */ #define MAKE_HLI_COMPATIBLE(hli_name, c_expr) enum { hli_name=/*lint -e30*/((int)(c_expr)) }; /*----------------------------------------------------------------------------*/ /* Function declarations */ /*----------------------------------------------------------------------------*/ /* Initialize a set of contiguous PCRs */ __asm void InitPCRs(void); /* Initialize the SIU External Bus Interface */ __asm void __initSIUExtBusInterface(void); /* Initialize the used EBI Chip Selects */ __asm void __initEBIChipSelects(void); /* Write one MMU Table Entry */ __asm void WriteMMUTableEntry( void ); /* Initialize the needed MMU Table entries */ __asm void __initMMUExternalMemory(void); /*----------------------------------------------------------------------------*/ /* Function implementations */ /*----------------------------------------------------------------------------*/ __asm void INIT_ExternalBusAndMemory(void) { nofralloc mflr r28 /* Initialize the SIU External Bus Interface */ bl __initSIUExtBusInterface /* Initialize the used EBI Chip Selects */ bl __initEBIChipSelects /* Initialize the needed MMU Table entries */ bl __initMMUExternalMemory mtlr r28 blr } /*----------------------------------------------------------------------------*/ /* External Memory Locations from lcf file */ /*----------------------------------------------------------------------------*/ #if INIT_USED_BOARD==MPC5516DEMO_AXM_0321 /* Symbol AXM_0321_EXTERNAL_RAM is defined in the application linker command file (.lcf) It is defined to the start of the external memory on the MPC5516DEMO_AXM-0321 board */ extern unsigned long AXM_0321_EXTERNAL_RAM[]; #endif /*----------------------------------------------------------------------------*/ /* SIU External Bus Interface */ /*----------------------------------------------------------------------------*/ /* Initialize a set of contiguous PCRs: */ /* r3: the firts PCR to initialize */ /* r4: the value to write in the PCRs */ /* r5: the number of PCRs to initialize */ __asm void InitPCRs(void) { nofralloc mtctr r5 /* intialize ctr with the number of PCRs to initialize */ pcr_init_loop: sth r4,0(r3) /* Write r4 to current PCR address */ addi r3,r3, 2 /* Inc the memory ptr by 2 to point to the next PCR */ bdnz pcr_init_loop /* Loop for ctr PCRs */ blr } /* Initialize the SIU External Bus Interface */ __asm void __initSIUExtBusInterface(void) { MAKE_HLI_COMPATIBLE(SIU_PCR0,&SIU.PCR[0].R) MAKE_HLI_COMPATIBLE(SIU_PCR4,&SIU.PCR[4].R) MAKE_HLI_COMPATIBLE(SIU_PCR28,&SIU.PCR[28].R) MAKE_HLI_COMPATIBLE(SIU_PCR62,&SIU.PCR[62].R) MAKE_HLI_COMPATIBLE(SIU_PCR64,&SIU.PCR[64].R) MAKE_HLI_COMPATIBLE(SIU_PCR68,&SIU.PCR[68].R) nofralloc mflr r27 /* This initializes the MPC5516 external bus Set up the pins Address bus PCR 4 - 27 Configure address bus pins */ lis r3,SIU_PCR4@h /* First PCR Address bus is PCR 4 */ ori r3,r3,SIU_PCR4@l li r5,24 /* Loop counter to get all address bus PCR (4 to 27) -> 24 PCRs */ li r4, 0x0440 /* PCRs initialization value */ bl InitPCRs /* Data bus PCR 28-59 Configure data bus pins */ lis r3,SIU_PCR28@h /* First PCR for data bus is PCR 28 */ ori r3,r3,SIU_PCR28@l li r5,32 /* Loop counter to get all data bus PCR (28-59) -> 32 PCRs */ li r4, 0x0440 /* PCRs initialization value */ bl InitPCRs /* Configure minimum bus control pins RD/WR & BDIP PCR 62/63 */ lis r3,SIU_PCR62@h /* First PCR for is PCR 62 */ ori r3,r3,SIU_PCR62@l li r5,2 /* Loop counter to get all PCR (62-63) -> 2 PCRs */ li r4, 0x0440 /* PCRs initialization value */ bl InitPCRs /* WE[0-4] PCR 64-67 */ lis r3,SIU_PCR64@h /* First PCR for is PCR 64 */ ori r3,r3,SIU_PCR64@l li r5,4 /* Loop counter to get all PCR (64-67) -> 4 PCRs */ li r4, 0x0443 /* PCRs initialization value */ bl InitPCRs /* OE & TS */ lis r3,SIU_PCR68@h /* First PCR for is PCR 68 */ ori r3,r3,SIU_PCR68@l li r5,2 /* Loop counter to get all PCR (68-69) -> 2 PCRs */ li r4, 0x0443 /* PCRs initialization value */ bl InitPCRs /* Configure the chip selects CS[0-3] */ lis r3,SIU_PCR0@h /* First PCR for is PCR 0 */ ori r3,r3,SIU_PCR0@l li r5,4 /* Loop counter to get all PCR (0-3) -> 4 PCRs */ li r4, 0x0443 /* PCRs initialization value */ bl InitPCRs mtlr r27 blr } /*----------------------------------------------------------------------------*/ /* EBI Chip Selects */ /*----------------------------------------------------------------------------*/ /* Initialize the used EBI Chip Selects */ __asm void __initEBIChipSelects(void) { #if INIT_USED_BOARD==MPC5516DEMO_AXM_0321 MAKE_HLI_COMPATIBLE(EBBI_CS0_BR,&EBI.CS[0].BR.R) MAKE_HLI_COMPATIBLE(EBBI_CS0_OR,&EBI.CS[0].OR.R) #endif nofralloc #if INIT_USED_BOARD==MPC5516DEMO_AXM_0321 /* CY7C1338 512K External SRAM - 4 beat burst, 0 wait Set up Memory Controller CS0 @ AXM_0321_EXTERNAL_RAM */ /* EBI.CS[0].BR.