diff options
Diffstat (limited to 'arch/arm/cpu/armv7/uniphier/smp.S')
| -rw-r--r-- | arch/arm/cpu/armv7/uniphier/smp.S | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm/cpu/armv7/uniphier/smp.S b/arch/arm/cpu/armv7/uniphier/smp.S new file mode 100644 index 0000000..25ba981 --- /dev/null +++ b/arch/arm/cpu/armv7/uniphier/smp.S @@ -0,0 +1,54 @@ +/* + * Copyright (C) 2013 Panasonic Corporation + * Author: Masahiro Yamada <yamada.m@jp.panasonic.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <config.h> +#include <linux/linkage.h> +#include <asm/system.h> +#include <asm/arch/led.h> +#include <asm/arch/sbc-regs.h> + +/* Entry point of U-Boot main program for the secondary CPU */ +LENTRY(secondary_entry) + mrc p15, 0, r0, c1, c0, 0 @ SCTLR (System Contrl Register) + bic r0, r0, #(CR_C | CR_M) @ MMU and Dcache disable + mcr p15, 0, r0, c1, c0, 0 + mcr p15, 0, r0, c8, c7, 0 @ invalidate TLBs + mcr p15, 0, r0, c7, c5, 0 @ invalidate icache + dsb + led_write(C,0,,) + ldr r1, =ROM_BOOT_ROMRSV2 + mov r0, #0 + str r0, [r1] +0: wfe + ldr r4, [r1] @ r4: entry point for secondary CPUs + cmp r4, #0 + beq 0b + led_write(C, P, U, 1) + bx r4 @ secondary CPUs jump to linux +ENDPROC(secondary_entry) + +ENTRY(wakeup_secondary) + ldr r1, =ROM_BOOT_ROMRSV2 +0: ldr r0, [r1] + cmp r0, #0 + bne 0b + + /* set entry address and send event to the secondary CPU */ + ldr r0, =secondary_entry + str r0, [r1] + ldr r0, [r1] @ make sure store is complete + mov r0, #0x100 +0: subs r0, r0, #1 @ I don't know the reason, but without this wait + bne 0b @ fails to wake up the secondary CPU + sev + + /* wait until the secondary CPU reach to secondary_entry */ +0: ldr r0, [r1] + cmp r0, #0 + bne 0b + bx lr +ENDPROC(wakeup_secondary) |