projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| a8cbcd92 RK |
1 | /* |
| 2 | * linux/arch/arm/kernel/smp_scu.c | |
| 3 | * | |
| 4 | * Copyright (C) 2002 ARM Ltd. | |
| 5 | * All Rights Reserved | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License version 2 as | |
| 9 | * published by the Free Software Foundation. | |
| 10 | */ | |
| 11 | #include <linux/init.h> | |
| 12 | #include <linux/io.h> | |
| 13 | ||
| 14 | #include <asm/smp_scu.h> | |
| af73110d | 15 | #include <asm/cacheflush.h> |
| a8cbcd92 RK |
16 | |
| 17 | #define SCU_CTRL 0x00 | |
| 18 | #define SCU_CONFIG 0x04 | |
| 19 | #define SCU_CPU_STATUS 0x08 | |
| 20 | #define SCU_INVALIDATE 0x0c | |
| 21 | #define SCU_FPGA_REVISION 0x10 | |
| 22 | ||
| 23 | /* | |
| 24 | * Get the number of CPU cores from the SCU configuration | |
| 25 | */ | |
| 26 | unsigned int __init scu_get_core_count(void __iomem *scu_base) | |
| 27 | { | |
| 28 | unsigned int ncores = __raw_readl(scu_base + SCU_CONFIG); | |
| 29 | return (ncores & 0x03) + 1; | |
| 30 | } | |
| 31 | ||
| 32 | /* | |
| 33 | * Enable the SCU | |
| 34 | */ | |
| 35 | void __init scu_enable(void __iomem *scu_base) | |
| 36 | { | |
| 37 | u32 scu_ctrl; | |
| 38 | ||
| 39 | scu_ctrl = __raw_readl(scu_base + SCU_CTRL); | |
| 9b229fa0 CM |
40 | /* already enabled? */ |
| 41 | if (scu_ctrl & 1) | |
| 42 | return; | |
| 43 | ||
| a8cbcd92 RK |
44 | scu_ctrl |= 1; |
| 45 | __raw_writel(scu_ctrl, scu_base + SCU_CTRL); | |
| af73110d CM |
46 | |
| 47 | /* | |
| 48 | * Ensure that the data accessed by CPU0 before the SCU was | |
| 49 | * initialised is visible to the other CPUs. | |
| 50 | */ | |
| 51 | flush_cache_all(); | |
| a8cbcd92 | 52 | } |