| Barry Song | 4898de3 | 2012-12-20 19:37:32 +0800 | [diff] [blame^] | 1 | /* |
| 2 | * Entry of the second core for CSR Marco dual-core SMP SoCs |
| 3 | * |
| 4 | * Copyright (c) 2012 Cambridge Silicon Radio Limited, a CSR plc group company. |
| 5 | * |
| 6 | * Licensed under GPLv2 or later. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/linkage.h> |
| 10 | #include <linux/init.h> |
| 11 | |
| 12 | __INIT |
| 13 | /* |
| 14 | * Cold boot and hardware reset show different behaviour, |
| 15 | * system will be always panic if we warm-reset the board |
| 16 | * Here we invalidate L1 of CPU1 to make sure there isn't |
| 17 | * uninitialized data written into memory later |
| 18 | */ |
| 19 | ENTRY(v7_invalidate_l1) |
| 20 | mov r0, #0 |
| 21 | mcr p15, 0, r0, c7, c5, 0 @ invalidate I cache |
| 22 | mcr p15, 2, r0, c0, c0, 0 |
| 23 | mrc p15, 1, r0, c0, c0, 0 |
| 24 | |
| 25 | ldr r1, =0x7fff |
| 26 | and r2, r1, r0, lsr #13 |
| 27 | |
| 28 | ldr r1, =0x3ff |
| 29 | |
| 30 | and r3, r1, r0, lsr #3 @ NumWays - 1 |
| 31 | add r2, r2, #1 @ NumSets |
| 32 | |
| 33 | and r0, r0, #0x7 |
| 34 | add r0, r0, #4 @ SetShift |
| 35 | |
| 36 | clz r1, r3 @ WayShift |
| 37 | add r4, r3, #1 @ NumWays |
| 38 | 1: sub r2, r2, #1 @ NumSets-- |
| 39 | mov r3, r4 @ Temp = NumWays |
| 40 | 2: subs r3, r3, #1 @ Temp-- |
| 41 | mov r5, r3, lsl r1 |
| 42 | mov r6, r2, lsl r0 |
| 43 | orr r5, r5, r6 @ Reg = (Temp<<WayShift)|(NumSets<<SetShift) |
| 44 | mcr p15, 0, r5, c7, c6, 2 |
| 45 | bgt 2b |
| 46 | cmp r2, #0 |
| 47 | bgt 1b |
| 48 | dsb |
| 49 | isb |
| 50 | mov pc, lr |
| 51 | ENDPROC(v7_invalidate_l1) |
| 52 | |
| 53 | /* |
| 54 | * SIRFSOC specific entry point for secondary CPUs. This provides |
| 55 | * a "holding pen" into which all secondary cores are held until we're |
| 56 | * ready for them to initialise. |
| 57 | */ |
| 58 | ENTRY(sirfsoc_secondary_startup) |
| 59 | bl v7_invalidate_l1 |
| 60 | mrc p15, 0, r0, c0, c0, 5 |
| 61 | and r0, r0, #15 |
| 62 | adr r4, 1f |
| 63 | ldmia r4, {r5, r6} |
| 64 | sub r4, r4, r5 |
| 65 | add r6, r6, r4 |
| 66 | pen: ldr r7, [r6] |
| 67 | cmp r7, r0 |
| 68 | bne pen |
| 69 | |
| 70 | /* |
| 71 | * we've been released from the holding pen: secondary_stack |
| 72 | * should now contain the SVC stack for this core |
| 73 | */ |
| 74 | b secondary_startup |
| 75 | ENDPROC(sirfsoc_secondary_startup) |
| 76 | |
| 77 | .align |
| 78 | 1: .long . |
| 79 | .long pen_release |