2 * Coherency fabric: low level functions
4 * Copyright (C) 2012 Marvell
6 * Gregory CLEMENT <gregory.clement@free-electrons.com>
8 * This file is licensed under the terms of the GNU General Public
9 * License version 2. This program is licensed "as is" without any
10 * warranty of any kind, whether express or implied.
12 * This file implements the assembly function to add a CPU to the
13 * coherency fabric. This function is called by each of the secondary
14 * CPUs during their early boot in an SMP kernel, this why this
15 * function have to callable from assembly. It can also be called by a
16 * primary CPU from C code during its boot.
19 #include <linux/linkage.h>
20 #define ARMADA_XP_CFB_CTL_REG_OFFSET 0x0
21 #define ARMADA_XP_CFB_CFG_REG_OFFSET 0x4
25 * r0: Coherency fabric base register address
28 ENTRY(ll_set_cpu_coherent)
29 /* Create bit by cpu index */
33 /* Add CPU to SMP group - Atomic */
34 add r3, r0, #ARMADA_XP_CFB_CTL_REG_OFFSET
42 /* Enable coherency on CPU - Atomic */
43 add r3, r3, #ARMADA_XP_CFB_CFG_REG_OFFSET
55 ENDPROC(ll_set_cpu_coherent)