diff options
Diffstat (limited to 'src/boot/otprom_init.S')
| -rw-r--r-- | src/boot/otprom_init.S | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/src/boot/otprom_init.S b/src/boot/otprom_init.S new file mode 100644 index 00000000..719e158a --- /dev/null +++ b/src/boot/otprom_init.S @@ -0,0 +1,178 @@ +# IBM_PROLOG_BEGIN_TAG +# This is an automatically generated prolog. +# +# $Source: src/boot/otprom_init.S $ +# +# OpenPOWER sbe Project +# +# Contributors Listed Below - COPYRIGHT 2016 +# +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or +# implied. See the License for the specific language governing +# permissions and limitations under the License. +# +# IBM_PROLOG_END_TAG +# # include "pk.h" +.set r0 , 0 +.set r1 , 1 +.set r2 , 2 +.set r3 , 3 +.set r4 , 4 +.set r5 , 5 +.set r6 , 6 +.set r7 , 7 +.set r8 , 8 +.set d0 , 0 +.set d2 , 2 +.set d7 , 7 +.global __reserved +__reserved: +############################################################# +################## OTPROM location data contents ############ +# SBE Seeprom Config_0 18068 +# SBE Seeprom Config_1 18069 +# SBE Seeprom Config_2 1806A +# SBE Seeprom Config_3 1806B +# Magic number stored in OTP 1806C +# Reserved 1806D +# Reserved 1806E +# Reserved 1806F +# 0x0040 : otprom loader +############################################################# +_start: +#lis r4 , 0x50 #dummy instruction +.org __reserved + 0x0040 +.macro .pm_otprom_fixed_system + .section .fixed, "a", @progbits +__seeprom0_config_reg: + .quad 0x80A91C7100000000 +__seeprom1_config_reg: + .quad 0x80AB1C7100001C71 +__seeprom2_config_reg: + .quad 0x80AD1C71000038E2 +__seeprom3_config_reg: + .quad 0x80AF1C7100005553 +__otprom_magic_num: + .quad 0x584950205345504D +__sbe_config_reg: + .quad 0x000A800030000000 + .endm +oos_start: #R4 --> A0000 R5 --> 5003F R6 --> C000_0818 + lis r4 , 0xA + ori r4 , r4 , 0x0 + stvd d0 , 1(r4) #Write reset reg . A0001 + lis r5 , 0x5 #Check the validity of scratch reg and then program the bit rate div + ori r5 , r5 , 0x0000 + lvd d2 , 0x3F(r5) #loads scratch_8 and updates R5 to scratch_1 + bb0wi r2 , 1 , oos_load_const_brd #checks if valid bit (bit1) is 1 if yes continue else branch + lvd d2 , 0x39(r5) + andis. r2 , r2 , 0xffff #delete last 2 bytes Confirmed first 2 bytes has Bit rate divisor + +oos_write_mode_reg: + lvd d0 , 6(r4) #D0 --> old mode reg and D2 --> has new brd + andi. r0 , r0 , 0xffff + or r0 , r0 , r2 + stvd d0 , 6(r4) #Store mode register + lis r6 , 0xc000 + ori r6 , r6, 0x0818 #Load clear address of local register FI2C_CFG + li r0 , 0xfff #Create the Clear mask + lis r1 , 0xf000 + stvd d0 , 0(r6) #write to clear register of local register + rlwinm r3, r2, 12 , 0 , 3 #First move last nibble to R3 0:3 + rlwinm r2, r2, 12 , 20, 31 #Store bit rate div in 20:35 location of local register 20:31 + stvd d2 , -8(r6) #Set register = C0000810 + b oos_write_mode_done + +oos_load_const_brd: + lis r2 , 0x3 #load constant BRD = 3 to first 2 bytes of R2 + b oos_write_mode_reg + +oos_write_mode_done: + +oos_force_stop_to_both_ports: + lis r0 , 0x8000 #load 0x80000000 for port busy register write + stvd d0 , 0xE(r4) #Write port busy register to clear + andi. r0 , r0 ,0 #stop_command = 0x1000_0020_0000_0000 + andi. r1 , r1 , 0 + oris r0 , r0 , 0x1000 + ori r0 , r0 , 0x0020 + stvd d0 , 0(r4) #Write control register with Stop command + +oos_poll_status_bit_0: + lvd d2 , 2(r4) #Read Status register + bb1wi r3 , 0xc , oos_poll_status_bit_0 + ori r0 , r0 , 0x0200 #stop_command = 0x1000_0220_0000_0000 + stvd d0 , 0(r4) #write control register with stop command to port 1 + +oos_poll_status_bit_1: + lvd d2 , 2(r4) + bb1wi r3 , 0xc , oos_poll_status_bit_1 + lis r0 , 0xd8a9 + ori r0 , r0 , 0x0090 #change the port number later after checking from the scratch register. Add the seeprom address pointer location by updating the R1 + andi. r1 , r1 , 0x0 #Chose address 0x0 of SEEPROM : 0xA8 + +oos_chk_port_num: + lvd d2 , 0x8(r5) #Read the port number from Selfboot control / status register :: + bb0wi r2 , 17 , oos_sel_prim_sprm #Check if backup seeprom select is '1' bit_17 according to Srinivas + ori r0 , r0 , 0x0200 #enable backup_sprm port + lvd d7, -24(r6) #load SBE_CONFIG local reg + oris r8 , r8 , 0x0200 #make bit 38 of sbe_config_reg bit '1'. (C0000800) + stvd d7, -24(r6) #Store SBE_CONFIG local reg + +oos_sel_prim_sprm: + stvd d0 , 0(r4) #write control register + +oos_poll_status_bit_2: + lvd d2 , 2(r4) #poll status reg + bb1wi r3 , 0xc , oos_poll_status_bit_2 + lvd d0 , 3(r4) #Read data reg to get magic number + +oss_load_constant_magic_num: #Magic number of seeprom = 0x584950205345504D + lis r2 , 0x5849 #load constant otprom magic number + ori r2 , r2 , 0x5020 + lis r3 , 0x5345 + ori r3 , r3, 0x504d + cmplwbc 0, 2, r0, r2, oos_cmp_magic_fail + cmplwbc 0, 2, r1, r3, oos_cmp_magic_fail + lis r4 , 0x0001 #OTPROM address = 0xZZZZ_YYYY PIB_addr (R4 = 18070) + ori r4 , r4 , 0x8068 + lis r5 , 0xc000 #local_reg_addr (R5 = C0000860) + ori r5 , r5 , 0x0860 + lvd d0 , 0(r4) + stvd d0 , 0(r5) #Seeprom_0 + lvd d0 , 1(r4) + stvd d0 , 32(r5) #Seeprom_1 + lvd d0 , 2(r4) + stvd d0 , 64(r5) #Seeprom_2 + lvd d0 , 3(r4) + stvd d0 , 96(r5) #Seeprom_3 + lvd d0 , 5(r4) #SBE Config + stvd d0 , -96(r5) + ##### Branch to SEEPROM ################### + lis r4 , 0x8000 #Go and fetch the branch address from 0x8000_0001 + ori r4 , r4 , 0x0008 + lvd d0 , 0(r4) + mtctr r1 + bctr #Branch to fetched address + ##### Branch to SEEPROM ################### + trap #FIXME hve to give branch to SEEPROM + +oos_cmp_magic_fail: + lis r5 , 0x5 #PIB_addr (R5 = 0x00050008) + ori r5 , r5 , 0x0000 + lvd d0 , 8(r5) + andi. r1 , r1 , 0xfff0 + ori r1 , r1 , 0x000e #59:63 : Error message : E = Magic number mismatch + stvd d0 ,8(r5) + trap + +.pm_otprom_fixed_system |
