| /*------------------------------------------------------------------------------+ */ |
| /* */ |
| /* 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 |
