| Masahiro Yamada | bb2ff9d | 2014-10-03 19:21:06 +0900 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2013 Panasonic Corporation |
| 3 | * Author: Masahiro Yamada <yamada.m@jp.panasonic.com> |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 6 | */ |
| 7 | |
| 8 | #include <config.h> |
| 9 | #include <linux/linkage.h> |
| 10 | #include <asm/system.h> |
| 11 | #include <asm/arch/led.h> |
| 12 | #include <asm/arch/sbc-regs.h> |
| 13 | |
| 14 | /* Entry point of U-Boot main program for the secondary CPU */ |
| 15 | LENTRY(secondary_entry) |
| 16 | mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register) |
| 17 | bic r0, r0, #(CR_C | CR_M) @ MMU and Dcache disable |
| 18 | mcr p15, 0, r0, c1, c0, 0 |
| 19 | mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs |
| 20 | mcr p15, 0, r0, c7, c5, 0 @ invalidate icache |
| 21 | dsb |
| 22 | led_write(C,0,,) |
| 23 | ldr r1, =ROM_BOOT_ROMRSV2 |
| 24 | mov r0, #0 |
| 25 | str r0, [r1] |
| 26 | 0: wfe |
| 27 | ldr r4, [r1] @ r4: entry point for secondary CPUs |
| 28 | cmp r4, #0 |
| 29 | beq 0b |
| 30 | led_write(C, P, U, 1) |
| 31 | bx r4 @ secondary CPUs jump to linux |
| 32 | ENDPROC(secondary_entry) |
| 33 | |
| 34 | ENTRY(wakeup_secondary) |
| 35 | ldr r1, =ROM_BOOT_ROMRSV2 |
| 36 | 0: ldr r0, [r1] |
| 37 | cmp r0, #0 |
| 38 | bne 0b |
| 39 | |
| 40 | /* set entry address and send event to the secondary CPU */ |
| 41 | ldr r0, =secondary_entry |
| 42 | str r0, [r1] |
| 43 | ldr r0, [r1] @ make sure store is complete |
| 44 | mov r0, #0x100 |
| 45 | 0: subs r0, r0, #1 @ I don't know the reason, but without this wait |
| 46 | bne 0b @ fails to wake up the secondary CPU |
| 47 | sev |
| 48 | |
| 49 | /* wait until the secondary CPU reach to secondary_entry */ |
| 50 | 0: ldr r0, [r1] |
| 51 | cmp r0, #0 |
| 52 | bne 0b |
| 53 | bx lr |
| 54 | ENDPROC(wakeup_secondary) |