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Diffstat (limited to 'board/eltec/elppc/asm_init.S')
| -rw-r--r-- | board/eltec/elppc/asm_init.S | 862 |
1 files changed, 0 insertions, 862 deletions
diff --git a/board/eltec/elppc/asm_init.S b/board/eltec/elppc/asm_init.S deleted file mode 100644 index 10fdfa254d..0000000000 --- a/board/eltec/elppc/asm_init.S +++ /dev/null @@ -1,862 +0,0 @@ -/* - * (C) Copyright 2001 ELTEC Elektronik AG - * Frank Gottschling <fgottschling@eltec.de> - * - * ELTEC ELPPC RAM initialization - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <config.h> -#include <asm/processor.h> -#include <version.h> -#include <mpc106.h> - -#include <ppc_asm.tmpl> -#include <ppc_defs.h> - -.globl board_asm_init -board_asm_init: - -/* - * setup pointer to message block - */ - mflr r13 /* save away link register */ - bl get_lnk_reg /* r3=addr of next instruction */ - subi r4, r3, 8 /* r4=board_asm_init addr */ - addi r29, 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 - - -/* - * setup memory controller - */ - 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 - - /* Configure PICR1 */ - lis r3, MPC106_REG@h - ori r3, r3, PCI_PICR1 - stwbrx r3, 0, r1 - addis r3, r0, 0xFF14 - ori r3, r3, 0x1CC8 - eieio - stwbrx r3, 0, r2 - - /* Configure PICR2 */ - lis r3, MPC106_REG@h - ori r3, r3, PCI_PICR2 - stwbrx r3, 0, r1 - addis r3, r0, 0x0000 - ori r3, r3, 0x0000 - eieio - stwbrx r3, 0, r2 - - /* Configure EUMBAR */ - lis r3, MPC106_REG@h - ori r3, r3, 0x0078 /* offest of EUMBAR in PCI config space */ - stwbrx r3, 0, r1 - lis r3, MPC107_EUMB_ADDR@h - eieio - stwbrx r3, 0, r2 - - /* Configure Address Map B Option Reg */ - lis r3, MPC106_REG@h - ori r3, r3, 0x00e0 /* offest of AMBOR in PCI config space */ - stwbrx r3, 0, r1 - lis r3, 0 - eieio - stwbrx r3, 0, r2 - - /* Configure I2C Controller */ - lis r14, MPC107_I2C_ADDR@h /* base of I2C controller */ - ori r14, r14, MPC107_I2C_ADDR@l - lis r3, 0x2b10 /* I2C clock = 100MHz/1024 */ - stw r3, 4(r14) - li r3, 0 /* clear arbitration */ - eieio - stw r3, 12(r14) - - /* Configure MCCR1 */ - lis r3, MPC106_REG@h - ori r3, r3, MPC106_MCCR1 - stwbrx r3, 0, r1 - addis r3, r0, 0x0660 /* don't set MEMGO now ! */ - ori r3, r3, 0x0000 - eieio - stwbrx r3, 0, r2 - - /* Configure MCCR2 */ - lis r3, MPC106_REG@h - ori r3, r3, MPC106_MCCR2 - stwbrx r3, 0, r1 - addis r3, r0, 0x0400 - ori r3, r3, 0x1800 - eieio - stwbrx r3, 0, r2 - - - /* Configure MCCR3 */ - lis r3, MPC106_REG@h - ori r3, r3, MPC106_MCCR3 - stwbrx r3, 0, r1 - addis r3, r0, 0x0230 - ori r3, r3, 0x0000 - eieio - stwbrx r3, 0, r2 - - /* Configure MCCR4 */ - lis r3, MPC106_REG@h - ori r3, r3, MPC106_MCCR4 - stwbrx r3, 0, r1 - addis r3, r0, 0x2532 - ori r3, r3, 0x2220 - eieio - stwbrx r3, 0, r2 - -/* - * configure memory interface (MICRs) - */ - addis r3, r0, 0x8000 /* ADDR_80 */ - ori r3, r3, 0x0080 /* SMEMADD1 */ - stwbrx r3, 0, r1 - addis r3, r0, 0xFFFF - ori r3, r3, 0x4000 - eieio - stwbrx r3, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_84 */ - ori r3, r3, 0x0084 /* SMEMADD2 */ - stwbrx r3, 0, r1 - addis r3, r0, 0xFFFF - ori r3, r3, 0xFFFF - eieio - stwbrx r3, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_88 */ - ori r3, r3, 0x0088 /* EXTSMEM1 */ - stwbrx r3, 0, r1 - addis r3, r0, 0x0303 - ori r3, r3, 0x0000 - eieio - stwbrx r3, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_8C */ - ori r3, r3, 0x008c /* EXTSMEM2 */ - stwbrx r3, 0, r1 - addis r3, r0, 0x0303 - ori r3, r3, 0x0303 - eieio - stwbrx r3, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_90 */ - ori r3, r3, 0x0090 /* EMEMADD1 */ - stwbrx r3, 0, r1 - addis r3, r0, 0xFFFF - ori r3, r3, 0x7F3F - eieio - stwbrx r3, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_94 */ - ori r3, r3, 0x0094 /* EMEMADD2 */ - stwbrx r3, 0, r1 - addis r3, r0, 0xFFFF - ori r3, r3, 0xFFFF - eieio - stwbrx r3, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_98 */ - ori r3, r3, 0x0098 /* EXTEMEM1 */ - stwbrx r3, 0, r1 - addis r3, r0, 0x0303 - ori r3, r3, 0x0000 - eieio - stwbrx r3, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_9C */ - ori r3, r3, 0x009c /* EXTEMEM2 */ - stwbrx r3, 0, r1 - addis r3, r0, 0x0303 - ori r3, r3, 0x0303 - eieio - stwbrx r3, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_A0 */ - ori r3, r3, 0x00a0 /* MEMBNKEN */ - stwbrx r3, 0, r1 - addis r3, r0, 0x0000 - ori r3, r3, 0x0003 - eieio - stwbrx r3, 0, r2 - -/* - * must wait at least 100us after HRESET to issue a MEMGO - */ - lis r0, 1 - mtctr r0 -memStartWait: - bdnz memStartWait - -/* - * enable RAM Operations through MCCR1 (MEMGO) - */ - lis r3, 0x8000 - ori r3, r3, 0x00f0 - stwbrx r3, r0, r1 - sync - lwbrx r3, 0, r2 - lis r0, 0x0008 - or r3, r0, r3 - stwbrx r3, 0, r2 - sync - -/* - * set LEDs first time - */ - li r3, 0x1 - lis r30, CONFIG_SYS_USR_LED_BASE@h - stb r3, 2(r30) - sync - -/* - * init COM1 for polled output - */ - lis r8, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/ - ori r8, r8, CONFIG_SYS_NS16550_COM1@l - 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 */ - eieio - li r9, (CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE) - stb r9, 0(r8) /* baud rate (LSB)*/ - eieio - li r9, ((CONFIG_SYS_NS16550_CLK / 16 / CONFIG_BAUDRATE) >> 8) - stb r9, 1(r8) /* baud rate (MSB) */ - eieio - li r9, 0x07 - stb r9, 3(r8) /* 8 data bits, 2 stop bit, no parity */ - eieio - li r9, 0x0b - stb r9, 4(r8) /* enable the receiver and transmitter (modem ctrl) */ - 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 bit, 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 bit, no parity */ - eieio - -/* - * intro message from message block - */ - addi r3, r29, (MnewLine-MessageBlock) - bl Printf - addi r3, r29, (MinitLogo-MessageBlock) - bl Printf - -/* - * memory cofiguration using SPD information stored on the SODIMMs - */ - addi r3, r29, (Mspd01-MessageBlock) - bl Printf - - li r17, 0 - - li r3, 0x0002 /* get RAM type from spd for bank0/1 */ - bl spdRead - - cmpi 0, 0, r3, -1 /* error ? */ - bne noSpdError - - addi r3, r29, (Mfail-MessageBlock) - bl Printf - - li r6, 0xe /* error codes in r6 and r7 */ - li r7, 0x0 - b toggleError /* fail - loop forever */ - -noSpdError: - mr r15, r3 /* save r3 */ - - addi r3, r29, (Mok-MessageBlock) - bl Printf - - cmpli 0, 0, r15, 0x0004 /* SDRAM ? */ - beq isSDRAM - - addi r3, r29, (MramTyp-MessageBlock) - bl Printf - - li r6, 0xd /* error codes in r6 and r7 */ - li r7, 0x0 - b toggleError /* fail - loop forever */ - -isSDRAM: - li r3, 0x0012 /* get supported CAS latencies from byte 18 */ - bl spdRead - mr r15, r3 - li r3, 0x09 - andi. r0, r15, 0x04 - bne maxCLis3 - li r3, 0x17 -maxCLis3: - andi. r0, r15, 0x02 - bne CL2 - - addi r3, r29, (MramTyp-MessageBlock) - bl Printf - - li r6, 0xc /* error codes in r6 and r7 */ - li r7, 0x0 - b toggleError /* fail - loop forever */ -CL2: - bl spdRead - cmpli 0, 0, r3, 0xa1 /* cycle time must be 10ns max. */ - blt speedOk - - addi r3, r29, (MramTyp-MessageBlock) - bl Printf - - li r6, 0xb /* error codes in r6 and r7 */ - li r7, 0x0 - b toggleError /* fail - loop forever */ -speedOk: - lis r20, 0x06e8 /* preset MCR1 value */ - - li r3, 0x0011 /* get number of internal banks from spd for bank0/1 */ - bl spdRead - - cmpli 0, 0, r3, 0x02 - beq SD_2B - cmpli 0, 0, r3, 0x04 - beq SD_4B -memConfErr: - addi r3, r29, (MramConfErr-MessageBlock) - bl Printf - - li r6, 0xa /* error codes in r6 and r7 */ - li r7, 0x0 - b toggleError /* fail - loop forever */ - -SD_2B: - li r3, 0x0003 /* get number of row bits from spd for bank0/1 */ - bl spdRead - cmpli 0, 0, r3, 0x0b - beq row11x2 - cmpli 0, 0, r3, 0x0c - beq row12x2or13x2 - cmpli 0, 0, r3, 0x0d - beq row12x2or13x2 - b memConfErr -SD_4B: - li r3, 0x0003 /* get number of row bits from spd for bank0/1 */ - bl spdRead - cmpli 0, 0, r3, 0x0b - beq row11x4or12x4 - cmpli 0, 0, r3, 0x0c - beq row11x4or12x4 - cmpli 0, 0, r3, 0x0d - beq row13x4 - b memConfErr -row12x2or13x2: - ori r20, r20, 0x05 - b row11x4or12x4 -row13x4: - ori r20, r20, 0x0a - b row11x4or12x4 -row11x2: - ori r20, r20, 0x0f -row11x4or12x4: - /* get the size of bank 0-1 */ - - li r3, 0x001f /* get bank size from spd for 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: - li r3, 0x000c /* get refresh from spd for bank0/1 */ - bl spdRead - andi. r3, r3, 0x007f /* mask selfrefresh bit */ - li r4, 0x1800 /* refesh cycle 1536 clocks left shifted 2 */ - cmpli 0, 0, r3, 0x0000 /* 15.6 us ? */ - beq writeRefresh - - li r4, 0x0c00 /* refesh cycle 768 clocks left shifted 2 */ - cmpli 0, 0, r3, 0x0002 /* 7.8 us ? */ - beq writeRefresh - - li r4, 0x3000 /* refesh cycle 3072 clocks left shifted 2 */ - cmpli 0, 0, r3, 0x0003 /* 31.3 us ? */ - beq writeRefresh - - li r4, 0x6000 /* refesh cycle 6144 clocks left shifted 2 */ - cmpli 0, 0, r3, 0x0004 /* 62.5 us ? */ - beq writeRefresh - - li r4, 0 - ori r4, r4, 0xc000 /* refesh cycle 8224 clocks left shifted 2 */ - cmpli 0, 0, r3, 0x0005 /* 125 us ? */ - beq writeRefresh - - b memConfErr - -writeRefresh: - lis r21, 0x0400 /* preset MCCR2 value */ - or r21, r21, r4 - - /* Overwrite MCCR1 */ - lis r3, MPC106_REG@h - ori r3, r3, MPC106_MCCR1 - stwbrx r3, 0, r1 - eieio - stwbrx r20, 0, r2 - - /* Overwrite MCCR2 */ - lis r3, MPC106_REG@h - ori r3, r3, MPC106_MCCR2 - stwbrx r3, 0, r1 - eieio - stwbrx r21, 0, r2 - - /* set the memory boundary registers for bank 0-3 */ - li r20, 0 - lis r23, 0x0303 - lis r24, 0x0303 - subi r21, r16, 1 /* calculate end address bank0 */ - li r22, 1 - - cmpi 0, 0, r17, 0 /* bank1 present ? */ - beq nobank1 - - andi. r3, r16, 0x00ff /* calculate start address of bank1 */ - andi. r4, r16, 0x0300 - rlwinm r3, r3, 8, 16, 23 - or r20, r20, r3 - or r23, r23, r4 - - add r16, r16, r17 /* add to total memory size */ - - subi r3, r16, 1 /* calculate end address of bank1 */ - andi. r4, r3, 0x0300 - andi. r3, r3, 0x00ff - rlwinm r3, r3, 8, 16, 23 - or r21, r21, r3 - or r24, r24, r4 - - ori r22, r22, 2 /* enable bank1 */ - b bankOk -nobank1: - ori r23, r23, 0x0300 /* set bank1 start to unused area */ - ori r24, r24, 0x0300 /* set bank1 end to unused area */ -bankOk: - addi r3, r29, (Mactivate-MessageBlock) - bl Printf - mr r3, r16 - bl OutDec - addi r3, r29, (Mact0123e-MessageBlock) - bl Printf - -/* - * overwrite MSAR1, MEAR1, EMSAR1, and EMEAR1 - */ - addis r3, r0, 0x8000 /* ADDR_80 */ - ori r3, r3, 0x0080 /* MSAR1 */ - stwbrx r3, 0, r1 - eieio - stwbrx r20, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_88 */ - ori r3, r3, 0x0088 /* EMSAR1 */ - stwbrx r3, 0, r1 - eieio - stwbrx r23, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_90 */ - ori r3, r3, 0x0090 /* MEAR1 */ - stwbrx r3, 0, r1 - eieio - stwbrx r21, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_98 */ - ori r3, r3, 0x0098 /* EMEAR1 */ - stwbrx r3, 0, r1 - eieio - stwbrx r24, 0, r2 - - addis r3, r0, 0x8000 /* ADDR_A0 */ - ori r3, r3, 0x00a0 /* MBER */ - stwbrx r3, 0, r1 - eieio - stwbrx r22, 0, r2 - -/* - * delay to let SDRAM go through several initialization/refresh cycles - */ - lis r3, 3 - mtctr r3 -memStartWait_1: - bdnz memStartWait_1 - eieio - -/* - * set LEDs end - */ - li r3, 0xf - lis r30, CONFIG_SYS_USR_LED_BASE@h - stb r3, 2(r30) - sync - - mtlr r13 - blr /* EXIT board_asm_init ... */ - -/*----------------------------------------------------------------------------*/ -/* - * print a message to COM1 in polling mode (r10=COM1 port, r3=(char*)string) - */ - -Printf: - lis r10, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/ - ori r10, r10, CONFIG_SYS_NS16550_COM1@l -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 a char to COM1 in polling mode (r10=COM1 port, r3=char) - */ -OutChr: - lis r10, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/ - ori r10, r10, CONFIG_SYS_NS16550_COM1@l -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 - -/* - * 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 -OutHex: - li r9, 28 /* shift reg for 8 digits */ -OHstart: - lis r10, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/ - ori r10, r10, CONFIG_SYS_NS16550_COM1@l -OutDig: - lbz r0, 0(r29) /* slow down dummy read */ - 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) - */ -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, CONFIG_SYS_NS16550_COM1@h /* COM1 base address*/ - ori r10, r10, CONFIG_SYS_NS16550_COM1@l - or. r7, r7, r7 - bne noblank1 - li r3, 0x20 - b OutDec4 -noblank1: - addi r3, r7, 48 /* convert to ASCII */ -OutDec4: - lbz r0, 0(r29) /* 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(r29) /* 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(r29) /* 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 - -/* - * hang endless loop - */ -toggleError: /* fail type in r6, r7=0xff, toggle LEDs */ - stb r7, 2(r30) /* r7 to LED */ - li r0, 0 - lis r9, 127 - ori r9, r9, 65535 -toggleError1: - addic r0, r0, 1 - cmpw cr1, r0, r9 - ble cr1, toggleError1 - stb r6, 2(r30) /* r6 to LED */ - li r0, 0 - lis r9, 127 - ori r9, r9, 65535 -toggleError2: - addic r0, r0, 1 - cmpw cr1, r0, r9 - ble cr1, toggleError2 - b toggleError - -/* - * routines to read from ram spd - */ -spdWaitIdle: - lis r0, 0x1 /* timeout for about 100us */ - mtctr r0 -iSpd: - lbz r10, 12(r14) - andi. r10, r10, 0x20 /* mask and test MBB */ - beq idle - bdnz iSpd - orc. r10, r0, r0 /* return -1 to caller */ -idle: - bclr 20, 0 /* return to caller */ - -waitSpd: - lis r0, 0x10 /* timeout for about 1.5ms */ - mtctr r0 -wSpd: - lbz r10, 12(r14) - andi. r10, r10, 0x82 - cmpli 0, 0, r10, 0x82 /* test MCF and MIF set */ - beq wend - bdnz wSpd - orc. r10, r0, r0 /* return -1 to caller */ - bclr 20, 0 /* return to caller */ - -wend: - li r10, 0 - stb r10, 12(r14) /* clear status */ - bclr 20, 0 /* return to caller */ - -/* - * spdread - * in: r3 adr to read - * out: r3 val or -1 for error - * uses r10, assumes that r14 points to I2C controller - */ -spdRead: - mfspr r25, 8 /* save link register */ - - bl spdWaitIdle - bne spdErr - - li r10, 0x80 /* start with MEN */ - stb r10, 8(r14) - eieio - - li r10, 0xb0 /* start as master */ - stb r10, 8(r14) - eieio - - li r10, 0xa0 /* write device 0xA0 */ - stb r10, 16(r14) - eieio - bl waitSpd - bne spdErr - - lbz r10, 12(r14) /* test ACK */ - andi. r10, r10, 0x01 - bne gotNoAck - - stb r3, 16(r14) /* data address */ - eieio - bl waitSpd - bne spdErr - - - li r10, 0xb4 /* switch to read - restart */ - stb r10, 8(r14) - eieio - - li r10, 0xa1 /* read device 0xA0 */ - stb r10, 16(r14) - eieio - bl waitSpd - bne spdErr - - li r10, 0xa8 /* no ACK */ - stb r10, 8(r14) - eieio - - lbz r10, 16(r14) /* trigger read next byte */ - eieio - bl waitSpd - bne spdErr - - li r10, 0x88 /* generate STOP condition */ - stb r10, 8(r14) - eieio - - lbz r3, 16(r14) /* return read byte */ - - mtspr 8, r25 /* restore link register */ - blr - -gotNoAck: - li r10, 0x80 /* generate STOP condition */ - stb r10, 8(r14) - eieio -spdErr: - orc r3, r0, r0 /* return -1 */ - mtspr 8, r25 /* restore link register */ - blr - -get_lnk_reg: - mflr r3 /* return link reg */ - blr - -MessageBlock: - -MinitLogo: - .ascii "\015\012*** ELTEC Elektronik, Mainz ***\015\012" - .ascii "\015\012Initialising RAM\015\012\000" -Mspd01: - .ascii " Reading SPD of SODIMM ...... \000" -MramTyp: - .ascii "\015\012\SDRAM with CL=2 at 100 MHz required!\015\012\000" -MramConfErr: - .ascii "\015\012\Unsupported SODIMM Configuration!\015\012\000" -Mactivate: - .ascii " Activating \000" -Mact0123e: - .ascii " MByte.\015\012\000" -Mok: - .ascii "OK \015\012\000" -Mfail: - .ascii "FAILED \015\012\000" -MnewLine: - .ascii "\015\012\000" - .align 4 |
