diff options
Diffstat (limited to 'board/eric/init.S')
| -rw-r--r-- | board/eric/init.S | 355 |
1 files changed, 355 insertions, 0 deletions
diff --git a/board/eric/init.S b/board/eric/init.S new file mode 100644 index 0000000000..bdf90a5f25 --- /dev/null +++ b/board/eric/init.S @@ -0,0 +1,355 @@ +/*------------------------------------------------------------------------------+ */ +/* */ +/* This source code has been made available to you by IBM on an AS-IS */ +/* basis. Anyone receiving this source is licensed under IBM */ +/* copyrights to use it in any way he or she deems fit, including */ +/* copying it, modifying it, compiling it, and redistributing it either */ +/* with or without modifications. No license under IBM patents or */ +/* patent applications is to be implied by the copyright license. */ +/* */ +/* Any user of this software should understand that IBM cannot provide */ +/* technical support for this software and will not be responsible for */ +/* any consequences resulting from the use of this software. */ +/* */ +/* Any person who transfers this source code or any derivative work */ +/* must include the IBM copyright notice, this paragraph, and the */ +/* preceding two paragraphs in the transferred software. */ +/* */ +/* COPYRIGHT I B M CORPORATION 1995 */ +/* LICENSED MATERIAL - PROGRAM PROPERTY OF I B M */ +/*------------------------------------------------------------------------------- */ + +/*----------------------------------------------------------------------------- */ +/* Function: ext_bus_cntlr_init */ +/* Description: Initializes the External Bus Controller for the external */ +/* peripherals. IMPORTANT: For pass1 this code must run from */ +/* cache since you can not reliably change a peripheral banks */ +/* timing register (pbxap) while running code from that bank. */ +/* For ex., since we are running from ROM on bank 0, we can NOT */ +/* execute the code that modifies bank 0 timings from ROM, so */ +/* we run it from cache. */ +/* */ +/*----------------------------------------------------------------------------- */ +#include <config.h> +#include <ppc4xx.h> + +#define _LINUX_CONFIG_H 1 /* avoid reading Linux autoconf.h file */ + +#include <ppc_asm.tmpl> +#include <ppc_defs.h> + +#include <asm/cache.h> +#include <asm/mmu.h> + + + .globl ext_bus_cntlr_init +ext_bus_cntlr_init: + mflr r4 /* save link register */ + bl ..getAddr +..getAddr: + mflr r3 /* get address of ..getAddr */ + mtlr r4 /* restore link register */ + addi r4,0,14 /* set ctr to 10; used to prefetch */ + mtctr r4 /* 10 cache lines to fit this function */ + /* in cache (gives us 8x10=80 instrctns) */ +..ebcloop: + icbt r0,r3 /* prefetch cache line for addr in r3 */ + addi r3,r3,32 /* move to next cache line */ + bdnz ..ebcloop /* continue for 10 cache lines */ + + /*------------------------------------------------------------------- */ + /* Delay to ensure all accesses to ROM are complete before changing */ + /* bank 0 timings. 200usec should be enough. */ + /* 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles */ + /*------------------------------------------------------------------- */ + addis r3,0,0x0 + ori r3,r3,0xA000 /* ensure 200usec have passed since reset */ + mtctr r3 +..spinlp: + bdnz ..spinlp /* spin loop */ + + /*----------------------------------------------------------------------- */ + /* Memory Bank 0 (Flash) initialization (from openbios) */ + /*----------------------------------------------------------------------- */ + + addi r4,0,pb0ap + mtdcr ebccfga,r4 + addis r4,0,CS0_AP@h + ori r4,r4,CS0_AP@l + mtdcr ebccfgd,r4 + + addi r4,0,pb0cr + mtdcr ebccfga,r4 + addis r4,0,CS0_CR@h + ori r4,r4,CS0_CR@l + mtdcr ebccfgd,r4 + + /*----------------------------------------------------------------------- */ + /* Memory Bank 1 (NVRAM/RTC) initialization */ + /*----------------------------------------------------------------------- */ + + addi r4,0,pb1ap + mtdcr ebccfga,r4 + addis r4,0,CS1_AP@h + ori r4,r4,CS1_AP@l + mtdcr ebccfgd,r4 + + addi r4,0,pb1cr + mtdcr ebccfga,r4 + addis r4,0,CS1_CR@h + ori r4,r4,CS1_CR@l + mtdcr ebccfgd,r4 + + /*----------------------------------------------------------------------- */ + /* Memory Bank 2 (A/D converter) initialization */ + /*----------------------------------------------------------------------- */ + + addi r4,0,pb2ap + mtdcr ebccfga,r4 + addis r4,0,CS2_AP@h + ori r4,r4,CS2_AP@l + mtdcr ebccfgd,r4 + + addi r4,0,pb2cr + mtdcr ebccfga,r4 + addis r4,0,CS2_CR@h + ori r4,r4,CS2_CR@l + mtdcr ebccfgd,r4 + + /*----------------------------------------------------------------------- */ + /* Memory Bank 3 (Ethernet PHY Reset) initialization */ + /*----------------------------------------------------------------------- */ + + addi r4,0,pb3ap + mtdcr ebccfga,r4 + addis r4,0,CS3_AP@h + ori r4,r4,CS3_AP@l + mtdcr ebccfgd,r4 + + addi r4,0,pb3cr + mtdcr ebccfga,r4 + addis r4,0,CS3_CR@h + ori r4,r4,CS3_CR@l + mtdcr ebccfgd,r4 + + /*----------------------------------------------------------------------- */ + /* Memory Bank 4 (PC-MIP PRSNT1#) initialization */ + /*----------------------------------------------------------------------- */ + + addi r4,0,pb4ap + mtdcr ebccfga,r4 + addis r4,0,CS4_AP@h + ori r4,r4,CS4_AP@l + mtdcr ebccfgd,r4 + + addi r4,0,pb4cr + mtdcr ebccfga,r4 + addis r4,0,CS4_CR@h + ori r4,r4,CS4_CR@l + mtdcr ebccfgd,r4 + + /*----------------------------------------------------------------------- */ + /* Memory Bank 5 (PC-MIP PRSNT2#) initialization */ + /*----------------------------------------------------------------------- */ + + addi r4,0,pb5ap + mtdcr ebccfga,r4 + addis r4,0,CS5_AP@h + ori r4,r4,CS5_AP@l + mtdcr ebccfgd,r4 + + addi r4,0,pb5cr + mtdcr ebccfga,r4 + addis r4,0,CS5_CR@h + ori r4,r4,CS5_CR@l + mtdcr ebccfgd,r4 + + /*----------------------------------------------------------------------- */ + /* Memory Bank 6 (CPU LED0) initialization */ + /*----------------------------------------------------------------------- */ + + addi r4,0,pb6ap + mtdcr ebccfga,r4 + addis r4,0,CS6_AP@h + ori r4,r4,CS6_AP@l + mtdcr ebccfgd,r4 + + addi r4,0,pb6cr + mtdcr ebccfga,r4 + addis r4,0,CS6_CR@h + ori r4,r4,CS5_CR@l + mtdcr ebccfgd,r4 + + /*----------------------------------------------------------------------- */ + /* Memory Bank 7 (CPU LED1) initialization */ + /*----------------------------------------------------------------------- */ + + addi r4,0,pb7ap + mtdcr ebccfga,r4 + addis r4,0,CS7_AP@h + ori r4,r4,CS7_AP@l + mtdcr ebccfgd,r4 + + addi r4,0,pb7cr + mtdcr ebccfga,r4 + addis r4,0,CS7_CR@h + ori r4,r4,CS7_CR@l + mtdcr ebccfgd,r4 + +/* addis r4,r0,FPGA_BRDC@h */ +/* ori r4,r4,FPGA_BRDC@l */ +/* lbz r3,0(r4) //get FPGA board control reg */ +/* eieio */ +/* ori r3,r3,0x01 //set UART1 control to select CTS/RTS */ +/* stb r3,0(r4) */ + + nop /* pass2 DCR errata #8 */ + blr + +/*----------------------------------------------------------------------------- */ +/* Function: sdram_init */ +/* Description: Configures SDRAM memory banks on ERIC. */ +/* We do manually init our SDRAM. */ +/* If we have two SDRAM banks, simply undef SINGLE_BANK (ROLF :-) */ +/* It is assumed that a 32MB 12x8(2) SDRAM is used. */ +/*----------------------------------------------------------------------------- */ + .globl sdram_init + +sdram_init: + + mflr r31 + +#ifdef CFG_SDRAM_MANUALLY + /*------------------------------------------------------------------- */ + /* Set MB0CF for bank 0. (0-32MB) Address Mode 4 since 12x8(2) */ + /*------------------------------------------------------------------- */ + + addi r4,0,mem_mb0cf + mtdcr memcfga,r4 + addis r4,0,MB0CF@h + ori r4,r4,MB0CF@l + mtdcr memcfgd,r4 + + /*------------------------------------------------------------------- */ + /* Set MB1CF for bank 1. (32MB-64MB) Address Mode 4 since 12x8(2) */ + /*------------------------------------------------------------------- */ + + addi r4,0,mem_mb1cf + mtdcr memcfga,r4 + addis r4,0,MB1CF@h + ori r4,r4,MB1CF@l + mtdcr memcfgd,r4 + + /*------------------------------------------------------------------- */ + /* Set MB2CF for bank 2. off */ + /*------------------------------------------------------------------- */ + + addi r4,0,mem_mb2cf + mtdcr memcfga,r4 + addis r4,0,MB2CF@h + ori r4,r4,MB2CF@l + mtdcr memcfgd,r4 + + /*------------------------------------------------------------------- */ + /* Set MB3CF for bank 3. off */ + /*------------------------------------------------------------------- */ + + addi r4,0,mem_mb3cf + mtdcr memcfga,r4 + addis r4,0,MB3CF@h + ori r4,r4,MB3CF@l + mtdcr memcfgd,r4 + + /*------------------------------------------------------------------- */ + /* Set the SDRAM Timing reg, SDTR1 and the refresh timer reg, RTR. */ + /* To set the appropriate timings, we need to know the SDRAM speed. */ + /* We can use the PLB speed since the SDRAM speed is the same as */ + /* the PLB speed. The PLB speed is the FBK divider times the */ + /* 405GP reference clock, which on the Walnut board is 33Mhz. */ + /* Thus, if FBK div is 2, SDRAM is 66Mhz; if FBK div is 3, SDRAM is */ + /* 100Mhz; if FBK is 3, SDRAM is 133Mhz. */ + /* NOTE: The Walnut board supports SDRAM speeds of 66Mhz, 100Mhz, and */ + /* maybe 133Mhz. */ + /*------------------------------------------------------------------- */ + + mfdcr r5,strap /* determine FBK divider */ + /* via STRAP reg to calc PLB speed. */ + /* SDRAM speed is the same as the PLB */ + /* speed. */ + rlwinm r4,r5,4,0x3 /* get FBK divide bits */ + +..chk_66: + cmpi %cr0,0,r4,0x1 + bne ..chk_100 + addis r6,0,SDTR_66@h /* SDTR1 value for 66Mhz */ + ori r6,r6,SDTR_66@l + addis r7,0,RTR_66 /* RTR value for 66Mhz */ + b ..sdram_ok +..chk_100: + cmpi %cr0,0,r4,0x2 + bne ..chk_133 + addis r6,0,SDTR_100@h /* SDTR1 value for 100Mhz */ + ori r6,r6,SDTR_100@l + addis r7,0,RTR_100 /* RTR value for 100Mhz */ + b ..sdram_ok +..chk_133: + addis r6,0,0x0107 /* SDTR1 value for 133Mhz */ + ori r6,r6,0x4015 + addis r7,0,0x07F0 /* RTR value for 133Mhz */ + +..sdram_ok: + /*------------------------------------------------------------------- */ + /* Set SDTR1 */ + /*------------------------------------------------------------------- */ + addi r4,0,mem_sdtr1 + mtdcr memcfga,r4 + mtdcr memcfgd,r6 + + /*------------------------------------------------------------------- */ + /* Set RTR */ + /*------------------------------------------------------------------- */ + addi r4,0,mem_rtr + mtdcr memcfga,r4 + mtdcr memcfgd,r7 + + /*------------------------------------------------------------------- */ + /* Delay to ensure 200usec have elapsed since reset. Assume worst */ + /* case that the core is running 200Mhz: */ + /* 200,000,000 (cycles/sec) X .000200 (sec) = 0x9C40 cycles */ + /*------------------------------------------------------------------- */ + addis r3,0,0x0000 + ori r3,r3,0xA000 /* ensure 200usec have passed since reset */ + mtctr r3 +..spinlp2: + bdnz ..spinlp2 /* spin loop */ + + /*------------------------------------------------------------------- */ + /* Set memory controller options reg, MCOPT1. */ + /* Set DC_EN to '1' and BRD_PRF to '01' for 16 byte PLB Burst */ + /* read/prefetch. */ + /*------------------------------------------------------------------- */ + addi r4,0,mem_mcopt1 + mtdcr memcfga,r4 + addis r4,0,0x8080 /* set DC_EN=1 */ + ori r4,r4,0x0000 + mtdcr memcfgd,r4 + + /*------------------------------------------------------------------- */ + /* Delay to ensure 10msec have elapsed since reset. This is */ + /* required for the MPC952 to stabalize. Assume worst */ + /* case that the core is running 200Mhz: */ + /* 200,000,000 (cycles/sec) X .010 (sec) = 0x1E8480 cycles */ + /* This delay should occur before accessing SDRAM. */ + /*------------------------------------------------------------------- */ + addis r3,0,0x001E + ori r3,r3,0x8480 /* ensure 10msec have passed since reset */ + mtctr r3 +..spinlp3: + bdnz ..spinlp3 /* spin loop */ + +#else +/*fixme: do SDRAM Autoconfig from EEPROM here */ + +#endif + mtlr r31 /* restore lr */ + blr |
