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Diffstat (limited to 'board/eltec/bab7xx/asm_init.S')
| -rw-r--r-- | board/eltec/bab7xx/asm_init.S | 1487 |
1 files changed, 1487 insertions, 0 deletions
diff --git a/board/eltec/bab7xx/asm_init.S b/board/eltec/bab7xx/asm_init.S new file mode 100644 index 0000000000..d739b81753 --- /dev/null +++ b/board/eltec/bab7xx/asm_init.S @@ -0,0 +1,1487 @@ +/* + * (C) Copyright 2001 ELTEC Elektronik AG + * Frank Gottschling <fgottschling@eltec.de> + * + * ELTEC BAB PPC RAM initialization + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <config.h> +#include <mpc75x.h> +#include <mpc106.h> +#include <version.h> + +#include <ppc_asm.tmpl> +#include <ppc_defs.h> + +/* + * This following contains the entry code for the initialization code + * for the MPC 106, a PCI Bridge/Memory Controller. + * Register usage: + * r0 = ramtest scratch register, toggleError loop counter + * r1 = 0xfec0 0cf8 CONFIG_ADDRESS + * r2 = 0xfee0 0cfc CONFIG_DATA + * r3 = scratch register, subroutine argument and return value, ramtest size + * r4 = scratch register, spdRead clock mask, OutHex loop count + * r5 = ramtest scratch register + * r6 = toggleError 1st value, spdRead port mask + * r7 = toggleError 2nd value, ramtest scratch register, + * spdRead scratch register (0x00) + * r8 = ramtest scratch register, spdRead scratch register (0x80) + * r9 = ramtest scratch register, toggleError loop end, OutHex digit + * r10 = ramtest scratch register, spdWriteByte parameter, + * spdReadByte return value, printf pointer to COM1 + * r11 = startType + * r12 = ramtest scratch register, spdRead data mask + * r13 = pointer to message block + * r14 = pointer to GOT + * r15 = scratch register, SPD save + * r16 = bank0 size, total memory size + * r17 = bank1 size + * r18 = bank2 size + * r19 = bank3 size + * r20 = MCCR1, MSAR1 + * r21 = MCCR3, MEAR1 + * r22 = MCCR4, MBER + * r23 = EMSAR1 + * r24 = EMEAR1 + * r25 = save link register 1st level + * r26 = save link register 2nd level + * r27 = save link register 3rd level + * r30 = pointer to GPIO for spdRead + */ + + +.globl board_asm_init +board_asm_init: +/* + * setup pointer to message block + */ + mflr r25 /* save away link register */ + bl get_lnk_reg /* r3=addr of next instruction */ + subi r4, r3, 8 /* r4=board_asm_init addr */ + addi r13, r4, (MessageBlock-board_asm_init) +/* + * dcache_disable + */ + mfspr r3, HID0 + li r4, HID0_DCE + andc r3, r3, r4 + mr r2, r3 + ori r3, r3, HID0_DCI + sync + mtspr HID0, r3 + mtspr HID0, r2 + isync + sync +/* + * icache_disable + */ + mfspr r3, HID0 + li r4, 0 + ori r4, r4, HID0_ICE + andc r3, r3, r4 + sync + mtspr HID0, r3 +/* + * invalidate caches + */ + ori r3, r3, (HID0_ICE | HID0_ICFI | HID0_DCI | HID0_DCE) + or r4, r4, r3 + isync + mtspr HID0, r4 + andc r4, r4, r3 + isync + mtspr HID0, r4 + isync +/* + * icache_enable + */ + mfspr r3, HID0 + ori r3, r3, (HID0_ICE | HID0_ICFI) + sync + mtspr HID0, r3 + + lis r1, 0xfec0 + ori r1, r1, 0x0cf8 + lis r2, 0xfee0 + ori r2, r2, 0xcfc + +#ifdef CFG_ADDRESS_MAP_A +/* + * Switch to address map A if necessary. + */ + lis r3, MPC106_REG@h + ori r3, r3, PCI_PICR1 + stwbrx r3, 0, r1 + sync + lwbrx r4, 0, r2 + sync + lis r0, PICR1_XIO_MODE@h + ori r0, r0, PICR1_XIO_MODE@l + andc r4, r4, r0 + lis r0, PICR1_ADDRESS_MAP@h + ori r0, r0, PICR1_ADDRESS_MAP@l + or r4, r4, r0 + stwbrx r4, 0, r2 + sync +#endif + +/* + * Do the init for the SIO. + */ + bl .sioInit + + addi r3, r13, (MinitLogo-MessageBlock) + bl Printf + + addi r3, r13, (Mspd01-MessageBlock) + bl Printf +/* + * Memory cofiguration using SPD information stored on the SODIMMs + */ + li r17, 0 + li r18, 0 + li r19, 0 + + li r3, 0x0002 /* get RAM type from spd for bank0/1 */ + bl spdRead + + cmpi 0, 0, r3, -1 /* error ? */ + bne noSpdError + + addi r3, r13, (Mfail-MessageBlock) + bl Printf + + li r6, 0xe0 /* error codes in r6 and r7 */ + li r7, 0x00 + b toggleError /* fail - loop forever */ + +noSpdError: + mr r15, r3 /* save r3 */ + + addi r3, r13, (Mok-MessageBlock) + bl Printf + + cmpli 0, 0, r15, 0x0001 /* FPM ? */ + beq configFPM + cmpli 0, 0, r15, 0x0002 /* EDO ? */ + beq configEDO + cmpli 0, 0, r15, 0x0004 /* SDRAM ? */ + beq configSDRAM + + li r6, 0xe0 /* error codes in r6 and r7 */ + li r7, 0x01 + b toggleError /* fail - loop forever */ + +configSDRAM: + addi r3, r13, (MsdRam-MessageBlock) + bl Printf +/* + * set the Memory Configuration Reg. 1 + */ + li r3, 0x001f /* get bank size from spd bank0/1 */ + bl spdRead + + andi. r3, r3, 0x0038 + beq SD16MB2B + + li r3, 0x0011 /* get number of internal banks */ + /* from spd for bank0/1 */ + bl spdRead + + cmpli 0, 0, r3, 0x02 + beq SD64MB2B + + cmpli 0, 0, r3, 0x04 + beq SD64MB4B + + li r6, 0xe0 /* error codes in r6 and r7 */ + li r7, 0x02 + b toggleError /* fail - loop forever */ + +SD64MB2B: + li r20, 0x0005 /* 64-Mbit SDRAM 2 banks */ + b SDRow2nd + +SD64MB4B: + li r20, 0x0000 /* 64-Mbit SDRAM 4 banks */ + b SDRow2nd + +SD16MB2B: + li r20, 0x000f /* 16-Mbit SDRAM 2 banks */ + +SDRow2nd: + li r3, 0x0102 /* get RAM type spd for bank2/3 */ + bl spdRead + + cmpli 0, 0, r3, 0x0004 + bne S2D64MB4B /* bank2/3 isn't present or no SDRAM */ + + li r3, 0x011f /* get bank size from spd bank2/3 */ + bl spdRead + + andi. r3, r3, 0x0038 + beq S2D16MB2B +/* + * set the Memory Configuration Reg. 2 + */ + li r3, 0x0111 /* get number of internal banks */ + /* from spd for bank2/3 */ + bl spdRead + + cmpli 0, 0, r3, 0x02 + beq S2D64MB2B + + cmpli 0, 0, r3, 0x04 + beq S2D64MB4B + + li r6, 0xe0 /* error codes in r6 and r7 */ + li r7, 0x03 + b toggleError /* fail - loop forever */ + +S2D64MB2B: + ori r20, r20, 0x0050 /* 64-Mbit SDRAM 2 banks */ + b S2D64MB4B + +S2D16MB2B: + ori r20, r20, 0x00f0 /* 16-Mbit SDRAM 2 banks */ + +/* + * set the Memory Configuration Reg. 3 + */ +S2D64MB4B: + lis r21, 0x8630 /* BSTOPRE = 0x80, REFREC = 6, */ + /* RDLAT = 3 */ + +/* + * set the Memory Configuration Reg. 4 + */ + lis r22, 0x2430 /* PRETOACT = 2, ACTOPRE = 4, */ + /* WCBUF = 1, RCBUF = 1 */ + ori r22, r22, 0x2220 /* SDMODE = 0x022, ACTORW = 2 */ + +/* + * get the size of bank 0-3 + */ + li r3, 0x001f /* get bank size from spd bank0/1 */ + bl spdRead + + rlwinm r16, r3, 2, 24, 29 /* calculate size in MByte */ + /* (128 MB max.) */ + + li r3, 0x0005 /* get number of banks from spd */ + /* for bank0/1 */ + bl spdRead + + cmpi 0, 0, r3, 2 /* 2 banks ? */ + bne SDRAMnobank1 + + mr r17, r16 + +SDRAMnobank1: + addi r3, r13, (Mspd23-MessageBlock) + bl Printf + + li r3, 0x0102 /* get RAM type spd for bank2/3 */ + bl spdRead + + cmpli 0, 0, r3, 0x0001 /* FPM ? */ + bne noFPM23 /* handle as EDO */ + addi r3, r13, (Mok-MessageBlock) + bl Printf + addi r3, r13, (MfpmRam-MessageBlock) + bl Printf + b configRAMcommon +noFPM23: + cmpli 0, 0, r3, 0x0002 /* EDO ? */ + bne noEDO23 + addi r3, r13, (Mok-MessageBlock) + bl Printf + addi r3, r13, (MedoRam-MessageBlock) + bl Printf + b configRAMcommon +noEDO23: + cmpli 0, 0, r3, 0x0004 /* SDRAM ? */ + bne noSDRAM23 + addi r3, r13, (Mok-MessageBlock) + bl Printf + addi r3, r13, (MsdRam-MessageBlock) + bl Printf + b configSDRAM23 +noSDRAM23: + addi r3, r13, (Mna-MessageBlock) + bl Printf + b configRAMcommon /* bank2/3 isn't present or no SDRAM */ + +configSDRAM23: + li r3, 0x011f /* get bank size from spd bank2/3 */ + bl spdRead + + rlwinm r18, r3, 2, 24, 29 /* calculate size in MByte */ + /* (128 MB max.) */ + + li r3, 0x0105 /* get number of banks from */ + /* spd bank0/1 */ + bl spdRead + + cmpi 0, 0, r3, 2 /* 2 banks ? */ + bne SDRAMnobank3 + + mr r19, r18 + +SDRAMnobank3: + b configRAMcommon + +configFPM: + addi r3, r13, (MfpmRam-MessageBlock) + bl Printf + b configEDO0 +/* + * set the Memory Configuration Reg. 1 + */ +configEDO: + addi r3, r13, (MedoRam-MessageBlock) + bl Printf +configEDO0: + lis r20, MCCR1_TYPE_EDO@h + +getSpdRowBank01: + li r3, 0x0003 /* get number of row bits from */ + /* spd from bank0/1 */ + bl spdRead + ori r20, r20, (MCCR1_BK0_9BITS | MCCR1_BK1_9BITS) + cmpli 0, 0, r3, 0x0009 /* bank0 - 9 row bits */ + beq getSpdRowBank23 + + ori r20, r20, (MCCR1_BK0_10BITS | MCCR1_BK1_10BITS) + cmpli 0, 0, r3, 0x000a /* bank0 - 10 row bits */ + beq getSpdRowBank23 + + ori r20, r20, (MCCR1_BK0_11BITS | MCCR1_BK1_11BITS) + cmpli 0, 0, r3, 0x000b /* bank0 - 11 row bits */ + beq getSpdRowBank23 + + ori r20, r20, (MCCR1_BK0_12BITS | MCCR1_BK1_12BITS) + cmpli 0, 0, r3, 0x000c /* bank0 - 12 row bits */ + beq getSpdRowBank23 + + cmpli 0, 0, r3, 0x000d /* bank0 - 13 row bits */ + beq getSpdRowBank23 + + li r6, 0xe0 /* error codes in r6 and r7 */ + li r7, 0x10 + b toggleError /* fail - loop forever */ + +getSpdRowBank23: + li r3, 0x0103 /* get number of row bits from */ + /* spd for bank2/3 */ + bl spdRead + + ori r20, r20, (MCCR1_BK2_9BITS | MCCR1_BK3_9BITS) + cmpli 0, 0, r3, 0x0009 /* bank0 - 9 row bits */ + beq writeRowBits + + ori r20, r20, (MCCR1_BK2_10BITS | MCCR1_BK3_10BITS) + cmpli 0, 0, r3, 0x000a /* bank0 - 10 row bits */ + beq writeRowBits + + ori r20, r20, (MCCR1_BK2_11BITS | MCCR1_BK3_11BITS) + cmpli 0, 0, r3, 0x000b /* bank0 - 11 row bits */ + beq writeRowBits + + ori r20, r20, (MCCR1_BK2_12BITS | MCCR1_BK3_12BITS) + +/* + * set the Memory Configuration Reg. 3 + */ +writeRowBits: + lis r21, 0x000a /* CPX = 1, RAS6P = 4 */ + ori r21, r21, 0x2293 /* CAS5 = 2, CP4 = 1, */ + /* CAS3 = 2, RCD2 = 2, RP = 3 */ +/* + * set the Memory Configuration Reg. 4 + */ + lis r22, 0x0010 /* all SDRAM parameter 0, */ + /* WCBUF flow through, */ + /* RCBUF registered */ +/* + * get the size of bank 0-3 + */ + li r3, 0x0003 /* get row bits from spd bank0/1 */ + bl spdRead + + li r16, 0 /* bank size is: */ + /* (8*2^row*2^column)/0x100000 MB */ + ori r16, r16, 0x8000 + rlwnm r16, r16, r3, 0, 31 + + li r3, 0x0004 /* get column bits from spd bank0/1 */ + bl spdRead + + rlwnm r16, r16, r3, 0, 31 + + li r3, 0x0005 /* get number of banks from */ + /* spd for bank0/1 */ + bl spdRead + + cmpi 0, 0, r3, 2 /* 2 banks ? */ + bne EDOnobank1 + + mr r17, r16 + +EDOnobank1: + addi r3, r13, (Mspd23-MessageBlock) + bl Printf + + li r3, 0x0102 /* get RAM type spd for bank2/3 */ + bl spdRead + + cmpli 0, 0, r3, 0x0001 /* FPM ? */ + bne noFPM231 /* handle as EDO */ + addi r3, r13, (Mok-MessageBlock) + bl Printf + addi r3, r13, (MfpmRam-MessageBlock) + bl Printf + b EDObank2 +noFPM231: + cmpli 0, 0, r3, 0x0002 /* EDO ? */ + bne noEDO231 + addi r3, r13, (Mok-MessageBlock) + bl Printf + addi r3, r13, (MedoRam-MessageBlock) + bl Printf + b EDObank2 +noEDO231: + cmpli 0, 0, r3, 0x0004 /* SDRAM ? */ + bne noSDRAM231 + addi r3, r13, (Mok-MessageBlock) + bl Printf + addi r3, r13, (MsdRam-MessageBlock) + bl Printf + b configRAMcommon +noSDRAM231: + addi r3, r13, (Mfail-MessageBlock) + bl Printf + b configRAMcommon /* bank2/3 isn't present or no SDRAM */ + +EDObank2: + li r3, 0x0103 /* get row bits from spd for bank2/3 */ + bl spdRead + + li r18, 0 /* bank size is: */ + /* (8*2^row*2^column)/0x100000 MB */ + ori r18, r18, 0x8000 + rlwnm r18, r18, r3, 0, 31 + + li r3, 0x0104 /* get column bits from spd bank2/3 */ + bl spdRead + + rlwnm r18, r18, r3, 0, 31 + + li r3, 0x0105 /* get number of banks from */ + /* spd for bank2/3 */ + bl spdRead + + cmpi 0, 0, r3, 2 /* 2 banks ? */ + bne configRAMcommon + + mr r19, r18 + +configRAMcommon: + lis r1, MPC106_REG_ADDR@h + ori r1, r1, MPC106_REG_ADDR@l + lis r2, MPC106_REG_DATA@h + ori r2, r2, MPC106_REG_DATA@l + + li r0, 0 + +/* + * If we are already running in RAM (debug mode), we should + * NOT reset the MEMGO flag. Otherwise we will stop all memory + * accesses. + */ +#ifdef IN_RAM + lis r4, MCCR1_MEMGO@h + ori r4, r4, MCCR1_MEMGO@l + or r20, r20, r4 +#endif + +/* + * set the Memory Configuration Reg. 1 + */ + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_MCCR1 /* register number 0xf0 */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stwbrx r20, r0, r2 /* write data to CONFIG_DATA */ +/* + * set the Memory Configuration Reg. 3 + */ + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_MCCR3 /* register number 0xf8 */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stwbrx r21, r0, r2 /* write data to CONFIG_DATA */ +/* + * set the Memory Configuration Reg. 4 + */ + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_MCCR4 /* register number 0xfc */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stwbrx r22, r0, r2 /* write data to CONFIG_DATA */ +/* + * set the memory boundary registers for bank 0-3 + */ + li r20, 0 + li r23, 0 + li r24, 0 + subi r21, r16, 1 /* calculate end address bank0 */ + li r22, (MBER_BANK0) + + cmpi 0, 0, r17, 0 /* bank1 present ? */ + beq nobank1 + + rlwinm r3, r16, 8, 16, 23 /* calculate start address of bank1 */ + or r20, r20, r3 + add r16, r16, r17 /* add to total memory size */ + subi r3, r16, 1 /* calculate end address of bank1 */ + rlwinm r3, r3, 8, 16, 23 + or r21, r21, r3 + ori r22, r22, (MBER_BANK1) /* enable bank1 */ + b bank2 + +nobank1: + ori r23, r23, 0x0300 /* set bank1 start to unused area */ + ori r24, r24, 0x0300 /* set bank1 end to unused area */ + +bank2: + cmpi 0, 0, r18, 0 /* bank2 present ? */ + beq nobank2 + + andi. r3, r16, 0x00ff /* calculate start address of bank2 */ + andi. r4, r16, 0x0300 + rlwinm r3, r3, 16, 8, 15 + or r20, r20, r3 + rlwinm r3, r4, 8, 8, 15 + or r23, r23, r3 + add r16, r16, r18 /* add to total memory size */ + subi r3, r16, 1 /* calculate end address of bank2 */ + andi. r4, r3, 0x0300 + andi. r3, r3, 0x00ff + rlwinm r3, r3, 16, 8, 15 + or r21, r21, r3 + rlwinm r3, r4, 8, 8, 15 + or r24, r24, r3 + ori r22, r22, (MBER_BANK2) /* enable bank2 */ + b bank3 + +nobank2: + lis r3, 0x0003 + or r23, r23, r3 /* set bank2 start to unused area */ + or r24, r24, r3 /* set bank2 end to unused area */ + +bank3: + cmpi 0, 0, r19, 0 /* bank3 present ? */ + beq nobank3 + + andi. r3, r16, 0x00ff /* calculate start address of bank3 */ + andi. r4, r16, 0x0300 + rlwinm r3, r3, 24, 0, 7 + or r20, r20, r3 + rlwinm r3, r4, 16, 0, 7 + or r23, r23, r3 + add r16, r16, r19 /* add to total memory size */ + subi r3, r16, 1 /* calculate end address of bank3 */ + andi. r4, r3, 0x0300 + andi. r3, r3, 0x00ff + rlwinm r3, r3, 24, 0, 7 + or r21, r21, r3 + rlwinm r3, r4, 16, 0, 7 + or r24, r24, r3 + ori r22, r22, (MBER_BANK3) /* enable bank3 */ + b writebound + +nobank3: + lis r3, 0x0300 + or r23, r23, r3 /* set bank3 start to unused area */ + or r24, r24, r3 /* set bank3 end to unused area */ + +writebound: + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_MSAR1 /* register number 0x80 */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stwbrx r20, r0, r2 /* write data to CONFIG_DATA */ + + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_MEAR1 /* register number 0x90 */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stwbrx r21, r0, r2 /* write data to CONFIG_DATA */ + + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_EMSAR1 /* register number 0x88 */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stwbrx r23, r0, r2 /* write data to CONFIG_DATA */ + + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_EMEAR1 /* register number 0x98 */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stwbrx r24, r0, r2 /* write data to CONFIG_DATA */ + +/* + * set boundaries of unused banks to unused address space + */ + lis r4, 0x0303 + ori r4, r4, 0x0303 /* bank 4-7 start and end adresses */ + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_EMSAR2 /* register number 0x8C */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stwbrx r4, r0, r2 /* write data to CONFIG_DATA */ + + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_EMEAR2 /* register number 0x9C */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stwbrx r4, r0, r2 /* write data to CONFIG_DATA */ + +/* + * set the Memory Configuration Reg. 2 + */ + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_MCCR2 /* register number 0xf4 */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + + li r3, 0x000c /* get refresh from spd for bank0/1 */ + bl spdRead + + cmpi 0, 0, r3, -1 /* error ? */ + bne common1 + + li r6, 0xe0 /* error codes in r6 and r7 */ + li r7, 0x20 + b toggleError /* fail - loop forever */ + +common1: + andi. r15, r3, 0x007f /* mask selfrefresh bit */ + li r3, 0x010c /* get refresh from spd for bank2/3 */ + bl spdRead + + cmpi 0, 0, r3, -1 /* error ? */ + beq common2 + andi. r3, r3, 0x007f /* mask selfrefresh bit */ + cmp 0, 0, r3, r15 /* find the lower */ + blt common3 + +common2: + mr r3, r15 + +common3: + li r4, 0x1010 /* refesh cycle 1028 clocks */ + /* left shifted 2 */ + cmpli 0, 0, r3, 0x0000 /* 15.6 us ? */ + beq writeRefresh + + li r4, 0x0808 /* refesh cycle 514 clocks */ + /* left shifted 2 */ + cmpli 0, 0, r3, 0x0002 /* 7.8 us ? */ + beq writeRefresh + + li r4, 0x2020 /* refesh cycle 2056 clocks */ + /* left shifted 2 */ + cmpli 0, 0, r3, 0x0003 /* 31.3 us ? */ + beq writeRefresh + + li r4, 0x4040 /* refesh cycle 4112 clocks */ + /* left shifted 2 */ + cmpli 0, 0, r3, 0x0004 /* 62.5 us ? */ + beq writeRefresh + + li r4, 0 + ori r4, r4, 0x8080 /* refesh cycle 8224 clocks */ + /* left shifted 2 */ + cmpli 0, 0, r3, 0x0005 /* 125 us ? */ + beq writeRefresh + + li r6, 0xe0 /* error codes in r6 and r7 */ + li r7, 0x21 + b toggleError /* fail - loop forever */ + +writeRefresh: + stwbrx r4, r0, r2 /* write data to CONFIG_DATA */ + +/* + * DRAM BANKS SHOULD BE ENABLED + */ + addi r3, r13, (Mactivate-MessageBlock) + bl Printf + mr r3, r16 + bl OutDec + addi r3, r13, (Mmbyte-MessageBlock) + bl Printf + + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_MBER /* register number 0xa0 */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + stb r22, 0(r2) /* write data to CONFIG_DATA */ + li r8, 0x63 /* PGMAX = 99 */ + stb r8, 3(r2) /* write data to CONFIG_DATA */ + +/* + * DRAM SHOULD NOW BE CONFIGURED AND ENABLED + * MUST WAIT 200us BEFORE ACCESSING + */ + li r0, 0x7800 + mtctr r0 + +wait200us: + bdnz wait200us + + lis r3, MPC106_REG@h /* start building new reg number */ + ori r3, r3, MPC106_MCCR1 /* register number 0xf0 */ + stwbrx r3, r0, r1 /* write this value to CONFIG_ADDR */ + eieio /* make sure mem. access is complete */ + + lwbrx r4, r0, r2 /* load r4 from CONFIG_DATA */ + + lis r0, MCCR1_MEMGO@h /* MEMGO=1 */ + ori r0, r0, MCCR1_MEMGO@l + or r4, r4, r0 /* set the MEMGO bit */ + stwbrx r4, r0, r2 /* write mdfd data to CONFIG_DATA */ + + li r0, 0x7000 + mtctr r0 + +wait8ref: + bdnz wait8ref + + addi r3, r13, (Mok-MessageBlock) + bl Printf + + mtlr r25 + blr + +/* + * Infinite loop called in case of an error during RAM initialisation. + * error codes in r6 and r7. + */ +toggleError: + li r0, 0 + lis r9, 127 + ori r9, r9, 65535 +toggleError1: + addic r0, r0, 1 + cmpw cr1, r0, r9 + ble cr1, toggleError1 + li r0, 0 + lis r9, 127 + ori r9, r9, 65535 +toggleError2: + addic r0, r0, 1 + cmpw cr1, r0, r9 + ble cr1, toggleError2 + b toggleError + + +/****************************************************************************** + * This function performs a basic initialisation of the superio chip + * to enable basic console output and SPD access during RAM initialisation. + * + * Upon completion, SIO resource registers are mapped as follows: + * Resource Enabled Address + * UART1 Yes 3F8-3FF COM1 + * UART2 Yes 2F8-2FF COM2 + * GPIO Yes 220-227 + */ +.set SIO_LUNINDEX, 0x07 /* SIO LUN index register */ +.set SIO_CNFG1, 0x21 /* SIO configuration #1 register */ +.set SIO_PCSCI, 0x23 /* SIO PCS configuration index reg */ +.set SIO_PCSCD, 0x24 /* SIO PCS configuration data reg */ +.set SIO_ACTIVATE, 0x30 /* SIO activate register */ +.set SIO_IOBASEHI, 0x60 /* SIO I/O port base address, 15:8 */ +.set SIO_IOBASELO, 0x61 /* SIO I/O port base address, 7:0 */ +.set SIO_LUNENABLE, 0x01 /* SIO LUN enable */ + +.sioInit: + mfspr r7, 8 /* save link register */ + +.sioInit_87308: + +/* + * Get base addr of ISA I/O space + */ + lis r6, CFG_ISA_IO@h + ori r6, r6, CFG_ISA_IO@l + +/* + * Set offset to base address for config registers. + */ +#if defined(CFG_NS87308_BADDR_0x) + addi r4, r0, 0x0279 +#elif defined(CFG_NS87308_BADDR_10) + addi r4, r0, 0x015C +#elif defined(CFG_NS87308_BADDR_11) + addi r4, r0, 0x002E +#endif + add r6, r6, r4 /* add offset to base */ + or r3, r6, r6 /* make a copy */ + +/* + * PMC (LUN 8) + */ + addi r4, r0, SIO_LUNINDEX /* select PMC LUN */ + addi r5, r0, 0x8 + bl .sio_bw + addi r4, r0, SIO_IOBASEHI /* initialize PMC address to 0x460 */ + addi r5, r0, 0x04 + bl .sio_bw + addi r4, r0, SIO_IOBASELO + addi r5, r0, 0x60 + bl .sio_bw + addi r4, r0, SIO_ACTIVATE /* enable PMC */ + addi r5, r0, SIO_LUNENABLE + bl .sio_bw + + lis r8, CFG_ISA_IO@h + ori r8, r8, 0x0460 + li r9, 0x03 + stb r9, 0(r8) /* select PMC2 register */ + eieio + li r9, 0x00 + stb r9, 1(r8) /* SuperI/O clock src: 24MHz via X1 */ + eieio + +/* + * map UART1 (LUN 6) or UART2 (LUN 5) to COM1 (0x3F8) + */ + addi r4, r0, SIO_LUNINDEX /* select COM1 LUN */ + addi r5, r0, 0x6 + bl .sio_bw + + addi r4, r0, SIO_IOBASEHI /* initialize COM1 address to 0x3F8 */ + addi r5, r0, 0x03 + bl .sio_bw + + addi r4, r0, SIO_IOBASELO + addi r5, r0, 0xF8 + bl .sio_bw + + addi r4, r0, SIO_ACTIVATE /* enable COM1 */ + addi r5, r0, SIO_LUNENABLE + bl .sio_bw + +/* + * Init COM1 for polled output + */ + lis r8, CFG_ISA_IO@h + ori r8, r8, 0x03f8 + li r9, 0x00 + stb r9, 1(r8) /* int disabled */ + eieio + li r9, 0x00 + stb r9, 4(r8) /* modem ctrl */ + eieio + li r9, 0x80 + stb r9, 3(r8) /* link ctrl, bank select */ + eieio + li r9, 115200/CONFIG_BAUDRATE + stb r9, 0(r8) /* baud rate (LSB)*/ + eieio + rotrwi r9, r9, 8 + stb r9, 1(r8) /* baud rate (MSB) */ + eieio + li r9, 0x03 + stb r9, 3(r8) /* 8 data bits, 1 stop bit, */ + /* no parity */ + eieio + li r9, 0x0b + stb r9, 4(r8) /* enable the receiver and transmitter */ + eieio + +waitEmpty: + lbz r9, 5(r8) /* transmit empty */ + andi. r9, r9, 0x40 + beq waitEmpty + li r9, 0x47 + stb r9, 3(r8) /* send break, 8 data bits, */ + /* 2 stop bits, no parity */ + eieio + + lis r0, 0x0001 + mtctr r0 + +waitCOM1: + lwz r0, 5(r8) /* load from port for delay */ + bdnz waitCOM1 + +waitEmpty1: + lbz r9, 5(r8) /* transmit empty */ + andi. r9, r9, 0x40 + beq waitEmpty1 + li r9, 0x07 + stb r9, 3(r8) /* 8 data bits, 2 stop bits, */ + /* no parity */ + eieio + +/* + * GPIO (LUN 7) + */ + addi r4, r0, SIO_LUNINDEX /* select GPIO LUN */ + addi r5, r0, 0x7 + bl .sio_bw + + addi r4, r0, SIO_IOBASEHI /* initialize GPIO address to 0x220 */ + addi r5, r0, 0x02 + bl .sio_bw + + addi r4, r0, SIO_IOBASELO + addi r5, r0, 0x20 + bl .sio_bw + + addi r4, r0, SIO_ACTIVATE /* enable GPIO */ + addi r5, r0, SIO_LUNENABLE + bl .sio_bw + +.sioInit_done: + +/* + * Get base addr of ISA I/O space + */ + lis r3, CFG_ISA_IO@h + ori r3, r3, CFG_ISA_IO@l + + addi r3, r3, 0x015C /* adjust to superI/O 87308 base */ + or r6, r3, r3 /* make a copy */ +/* + * CS0 + */ + addi r4, r0, SIO_PCSCI /* select PCSCIR */ + addi r5, r0, 0x00 + bl .sio_bw + addi r4, r0, SIO_PCSCD /* select PCSCDR */ + addi r5, r0, 0x00 + bl .sio_bw + addi r4, r0, SIO_PCSCI /* select PCSCIR */ + addi r5, r0, 0x01 + bl .sio_bw + addi r4, r0, SIO_PCSCD /* select PCSCDR */ + addi r5, r0, 0x76 + bl .sio_bw + addi r4, r0, SIO_PCSCI /* select PCSCIR */ + addi r5, r0, 0x02 + bl .sio_bw + addi r4, r0, SIO_PCSCD /* select PCSCDR */ + addi r5, r0, 0x40 + bl .sio_bw +/* + * CS1 + */ + addi r4, r0, SIO_PCSCI /* select PCSCIR */ + addi r5, r0, 0x05 + bl .sio_bw + addi r4, r0, SIO_PCSCD /* select PCSCDR */ + addi r5, r0, 0x00 + bl .sio_bw + addi r4, r0, SIO_PCSCI /* select PCSCIR */ + addi r5, r0, 0x05 + bl .sio_bw + addi r4, r0, SIO_PCSCD /* select PCSCDR */ + addi r5, r0, 0x70 + bl .sio_bw + addi r4, r0, SIO_PCSCI /* select PCSCIR */ + addi r5, r0, 0x06 + bl .sio_bw + addi r4, r0, SIO_PCSCD /* select PCSCDR */ + addi r5, r0, 0x1C + bl .sio_bw +/* + * CS2 + */ + addi r4, r0, SIO_PCSCI /* select PCSCIR */ + addi r5, r0, 0x08 + bl .sio_bw + addi r4, r0, SIO_PCSCD /* select PCSCDR */ + addi r5, r0, 0x00 + bl .sio_bw + addi r4, r0, SIO_PCSCI /* select PCSCIR */ + addi r5, r0, 0x09 + bl .sio_bw + addi r4, r0, SIO_PCSCD /* select PCSCDR */ + addi r5, r0, 0x71 + bl .sio_bw + addi r4, r0, SIO_PCSCI /* select PCSCIR */ + addi r5, r0, 0x0A + bl .sio_bw + addi r4, r0, SIO_PCSCD /* select PCSCDR */ + addi r5, r0, 0x1C + bl .sio_bw + + mtspr 8, r7 /* restore link register */ + bclr 20, 0 /* return to caller */ + +/* + * this function writes a register to the SIO chip + */ +.sio_bw: + stb r4, 0(r3) /* write index register with register offset */ + eieio + sync + stb r5, 1(r3) /* 1st write */ + eieio + sync + stb r5, 1(r3) /* 2nd write */ + eieio + sync + bclr 20, 0 /* return to caller */ +/* + * this function reads a register from the SIO chip + */ +.sio_br: + stb r4, 0(r3) /* write index register with register offset */ + eieio + sync + lbz r3, 1(r3) /* retrieve specified reg offset contents */ + eieio + sync + bclr 20, 0 /* return to caller */ + +/* + * Print a message to COM1 in polling mode + * r10=COM1 port, r3=(char*)string + */ +.globl Printf +Printf: + lis r10, CFG_ISA_IO@h /* COM1 port */ + ori r10, r10, 0x03f8 + +WaitChr: + lbz r0, 5(r10) /* read link status */ + eieio + andi. r0, r0, 0x40 /* mask transmitter empty bit */ + beq cr0, WaitChr /* wait till empty */ + lbzx r0, r0, r3 /* get char */ + stb r0, 0(r10) /* write to transmit reg */ + eieio + addi r3, r3, 1 /* next char */ + lbzx r0, r0, r3 /* get char */ + cmpwi cr1, r0, 0 /* end of string ? */ + bne cr1, WaitChr + blr + +/* + * Print 8/4/2 digits hex value to COM1 in polling mode + * r10=COM1 port, r3=val + */ +OutHex2: + li r9, 4 /* shift reg for 2 digits */ + b OHstart +OutHex4: + li r9, 12 /* shift reg for 4 digits */ + b OHstart + .globl OutHex +OutHex: + li r9, 28 /* shift reg for 8 digits */ +OHstart: + lis r10, CFG_ISA_IO@h /* COM1 port */ + ori r10, r10, 0x03f8 +OutDig: + lbz r0, 5(r10) /* read link status */ + eieio + andi. r0, r0, 0x40 /* mask transmitter empty bit */ + beq cr0, OutDig + sraw r0, r3, r9 + clrlwi r0, r0, 28 + cmpwi cr1, r0, 9 + ble cr1, digIsNum + addic r0, r0, 55 + b nextDig +digIsNum: + addic r0, r0, 48 +nextDig: + stb r0, 0(r10) /* write to transmit reg */ + eieio + addic. r9, r9, -4 + bge OutDig + blr +/* + * Print 3 digits hdec value to COM1 in polling mode + * r10=COM1 port, r3=val, r7=x00, r8=x0, r9=x, r0, r6=scratch + */ +.globl OutDec +OutDec: + li r6, 10 + divwu r0, r3, r6 /* r0 = r3 / 10, r9 = r3 mod 10 */ + mullw r10, r0, r6 + subf r9, r10, r3 + + mr r3, r0 + divwu r0, r3, r6 /* r0 = r3 / 10, r8 = r3 mod 10 */ + mullw r10, r0, r6 + subf r8, r10, r3 + + mr r3, r0 + divwu r0, r3, r6 /* r0 = r3 / 10, r7 = r3 mod 10 */ + mullw r10, r0, r6 + subf r7, r10, r3 + + lis r10, CFG_ISA_IO@h /* COM1 port */ + ori r10, r10, 0x03f8 + + or. r7, r7, r7 + bne noblank1 + li r3, 0x20 + b OutDec4 + +noblank1: + addi r3, r7, 48 /* convert to ASCII */ + +OutDec4: + lbz r0, 0(r13) /* slow down dummy read */ + lbz r0, 5(r10) /* read link status */ + eieio + andi. r0, r0, 0x40 /* mask transmitter empty bit */ + beq cr0, OutDec4 + stb r3, 0(r10) /* x00 to transmit */ + eieio + + or. r7, r7, r8 + beq OutDec5 + + addi r3, r8, 48 /* convert to ASCII */ +OutDec5: + lbz r0, 0(r13) /* slow down dummy read */ + lbz r0, 5(r10) /* read link status */ + eieio + andi. r0, r0, 0x40 /* mask transmitter empty bit */ + beq cr0, OutDec5 + stb r3, 0(r10) /* x0 to transmit */ + eieio + + addi r3, r9, 48 /* convert to ASCII */ +OutDec6: + lbz r0, 0(r13) /* slow down dummy read */ + lbz r0, 5(r10) /* read link status */ + eieio + andi. r0, r0, 0x40 /* mask transmitter empty bit */ + beq cr0, OutDec6 + stb r3, 0(r10) /* x to transmit */ + eieio + blr +/* + * Print a char to COM1 in polling mode + * r10=COM1 port, r3=char + */ +.globl OutChr +OutChr: + lis r10, CFG_ISA_IO@h /* COM1 port */ + ori r10, r10, 0x03f8 + +OutChr1: + lbz r0, 5(r10) /* read link status */ + eieio + andi. r0, r0, 0x40 /* mask transmitter empty bit */ + beq cr0, OutChr1 /* wait till empty */ + stb r3, 0(r10) /* write to transmit reg */ + eieio + blr +/* + * Input: r3 adr to read + * Output: r3 val or -1 for error + */ +spdRead: + mfspr r26, 8 /* save link register */ + + lis r30, CFG_ISA_IO@h + ori r30, r30, 0x220 /* GPIO Port 1 */ + li r7, 0x00 + li r8, 0x100 + and. r5, r3, r8 + beq spdbank0 + li r12, 0x08 + li r4, 0x10 + li r6, 0x18 + b spdRead1 + +spdbank0: + li r12, 0x20 /* set I2C data */ + li r4, 0x40 /* set I2C clock */ + li r6, 0x60 /* set I2C clock and data */ + +spdRead1: + li r8, 0x80 + + bl spdStart /* access I2C bus as master */ + li r10, 0xa0 /* write to SPD */ + bl spdWriteByte + bl spdReadAck /* ACK returns in r10 */ + cmpw cr0, r10, r7 + bne AckErr /* r10 must be 0, if ACK received */ + mr r10, r3 /* adr to read */ + bl spdWriteByte + bl spdReadAck + cmpw cr0, r10, r7 + bne AckErr + bl spdStart + li r10, 0xa1 /* read from SPD */ + bl spdWriteByte + bl spdReadAck + cmpw cr0, r10, r7 + bne AckErr + bl spdReadByte /* return val in r10 */ + bl spdWriteAck + bl spdStop /* release I2C bus */ + mr r3, r10 + mtspr 8, r26 /* restore link register */ + blr +/* + * ACK error occurred + */ +AckErr: + bl spdStop + orc r3, r0, r0 /* return -1 */ + mtspr 8, r26 /* restore link register */ + blr + +/* + * Routines to read from RAM spd. + * r30 - GPIO Port1 address in all cases. + * r4 - clock mask for SPD + * r6 - port mask for SPD + * r12 - data mask for SPD + */ +waitSpd: + li r0, 0x1000 + mtctr r0 +wSpd: + bdnz wSpd + bclr 20, 0 /* return to caller */ + +/* + * establish START condition on I2C bus + */ +spdStart: + mfspr r27, 8 /* save link register */ + stb r6, 0(r30) /* set SDA and SCL */ + eieio + stb r6, 1(r30) /* switch GPIO to output */ + eieio + bl waitSpd + stb r4, 0(r30) /* reset SDA */ + eieio + bl waitSpd + stb r7, 0(r30) /* reset SCL */ + eieio + bl waitSpd + mtspr 8, r27 + bclr 20, 0 /* return to caller */ + +/* + * establish STOP condition on I2C bus + */ +spdStop: + mfspr r27, 8 /* save link register */ + stb r7, 0(r30) /* reset SCL and SDA */ + eieio + stb r6, 1(r30) /* switch GPIO to output */ + eieio + bl waitSpd + stb r4, 0(r30) /* set SCL */ + eieio + bl waitSpd + stb r6, 0(r30) /* set SDA and SCL */ + eieio + bl waitSpd + stb r7, 1(r30) /* switch GPIO to input */ + eieio + mtspr 8, r27 + bclr 20, 0 /* return to caller */ + +spdReadByte: + mfspr r27, 8 + stb r4, 1(r30) /* set GPIO for SCL output */ + eieio + li r9, 0x08 + li r10, 0x00 +loopRB: + stb r7, 0(r30) /* reset SDA and SCL */ + eieio + bl waitSpd + stb r4, 0(r30) /* set SCL */ + eieio + bl waitSpd + lbz r5, 0(r30) /* read from GPIO Port1 */ + rlwinm r10, r10, 1, 0, 31 + and. r5, r5, r12 + beq clearBit + ori r10, r10, 0x01 /* append _1_ */ +clearBit: + stb r7, 0(r30) /* reset SCL */ + eieio + bl waitSpd + addic. r9, r9, -1 + bne loopRB + mtspr 8, r27 + bclr 20, 0 /* return (r10) to caller */ + +/* + * spdWriteByte writes bits 24 - 31 of r10 to I2C. + * r8 contains bit mask 0x80 + */ +spdWriteByte: + mfspr r27, 8 /* save link register */ + li r9, 0x08 /* write octet */ + and. r5, r10, r8 + bne sWB1 + stb r7, 0(r30) /* set SDA to _0_ */ + eieio + b sWB2 +sWB1: + stb r12, 0(r30) /* set SDA to _1_ */ + eieio +sWB2: + stb r6, 1(r30) /* set GPIO to output */ + eieio +loopWB: + and. r5, r10, r8 + bne sWB3 + stb r7, 0(r30) /* set SDA to _0_ */ + eieio + b sWB4 +sWB3: + stb r12, 0(r30) /* set SDA to _1_ */ + eieio +sWB4: + bl waitSpd + and. r5, r10, r8 + bne sWB5 + stb r4, 0(r30) /* set SDA to _0_ and SCL */ + eieio + b sWB6 +sWB5: + stb r6, 0(r30) /* set SDA to _1_ and SCL */ + eieio +sWB6: + bl waitSpd + and. r5, r10, r8 + bne sWB7 + stb r7, 0(r30) /* set SDA to _0_ and reset SCL */ + eieio + b sWB8 +sWB7: + stb r12, 0(r30) /* set SDA to _1_ and reset SCL */ + eieio +sWB8: + bl waitSpd + rlwinm r10, r10, 1, 0, 31 /* next bit */ + addic. r9, r9, -1 + bne loopWB + mtspr 8, r27 + bclr 20, 0 /* return to caller */ + +/* + * Read ACK from SPD, return value in r10 + */ +spdReadAck: + mfspr r27, 8 /* save link register */ + stb r4, 1(r30) /* set GPIO to output */ + eieio + stb r7, 0(r30) /* reset SDA and SCL */ + eieio + bl waitSpd + stb r4, 0(r30) /* set SCL */ + eieio + bl waitSpd + lbz r10, 0(r30) /* read GPIO Port 1 and mask SDA */ + and r10, r10, r12 + bl waitSpd + stb r7, 0(r30) /* reset SDA and SCL */ + eieio + bl waitSpd + mtspr 8, r27 + bclr 20, 0 /* return (r10) to caller */ + +spdWriteAck: + mfspr r27, 8 + stb r12, 0(r30) /* set SCL */ + eieio + stb r6, 1(r30) /* set GPIO to output */ + eieio + bl waitSpd + stb r6, 0(r30) /* SDA and SCL */ + eieio + bl waitSpd + stb r12, 0(r30) /* reset SCL */ + eieio + bl waitSpd + mtspr 8, r27 + bclr 20, 0 /* return to caller */ + +get_lnk_reg: + mflr r3 /* return link reg */ + blr + +/* + * Messages for console output + */ +.globl MessageBlock +MessageBlock: +Mok: + .ascii "OK\015\012\000" +Mfail: + .ascii "FAILED\015\012\000" +Mna: + .ascii "NA\015\012\000" +MinitLogo: + .ascii "\015\012*** ELTEC Elektronik, Mainz ***\015\012" + .ascii "\015\012Initialising RAM\015\012\000" +Mspd01: + .ascii " Reading SPD of bank0/1 ..... \000" +Mspd23: + .ascii " Reading SPD of bank2/3 ..... \000" +MfpmRam: + .ascii " RAM-Type: FPM \015\012\000" +MedoRam: + .ascii " RAM-Type: EDO \015\012\000" +MsdRam: + .ascii " RAM-Type: SDRAM \015\012\000" +Mactivate: + .ascii " Activating \000" +Mmbyte: + .ascii " MB .......... \000" + .align 4 + + + + + + + + + + + + |