diff options
Diffstat (limited to 'board/mpl/mip405/init.S')
| -rw-r--r-- | board/mpl/mip405/init.S | 50 |
1 files changed, 48 insertions, 2 deletions
diff --git a/board/mpl/mip405/init.S b/board/mpl/mip405/init.S index f0a500ae1..ad3f78df4 100644 --- a/board/mpl/mip405/init.S +++ b/board/mpl/mip405/init.S @@ -50,9 +50,13 @@ #include "mip405.h" - .globl ext_bus_cntlr_init + .globl ext_bus_cntlr_init ext_bus_cntlr_init: - mflr r4 /* save link register */ + mflr r4 /* save link register */ + mfdcr r3,strap /* get strapping reg */ + andi. r0, r3, PSR_ROM_LOC /* mask out irrelevant bits */ + bnelr /* jump back if PCI boot */ + bl ..getAddr ..getAddr: mflr r3 /* get address of ..getAddr */ @@ -200,3 +204,45 @@ sdram_init: blr + +#if defined(CONFIG_BOOT_PCI) + .section .bootpg,"ax" + .globl _start_pci +/******************************************* + */ + +_start_pci: + /* first handle errata #68 / PCI_18 */ + iccci r0, r0 /* invalidate I-cache */ + lis r31, 0 + mticcr r31 /* ICCR = 0 (all uncachable) */ + isync + + mfccr0 r28 /* set CCR0[24] = 1 */ + ori r28, r28, 0x0080 + mtccr0 r28 + + /* setup PMM0MA (0xEF400004) and PMM0PCIHA (0xEF40000C) */ + lis r28, 0xEF40 + addi r28, r28, 0x0004 + stw r31, 0x0C(r28) /* clear PMM0PCIHA */ + lis r29, 0xFFF8 /* open 512 kByte */ + addi r29, r29, 0x0001/* and enable this region */ + stwbrx r29, r0, r28 /* write PMM0MA */ + + lis r28, 0xEEC0 /* address of PCIC0_CFGADDR */ + addi r29, r28, 4 /* add 4 to r29 -> PCIC0_CFGDATA */ + + lis r31, 0x8000 /* set en bit bus 0 */ + ori r31, r31, 0x304C/* device 6 func 0 reg 4C (XBCS register) */ + stwbrx r31, r0, r28 /* write it */ + + lwbrx r31, r0, r29 /* load XBCS register */ + oris r31, r31, 0x02C4/* clear BIOSCS WPE, set lower, extended and 1M extended BIOS enable */ + stwbrx r31, r0, r29 /* write back XBCS register */ + + nop + nop + b _start /* normal start */ +#endif + |