1/*
2 * Coherency fabric: low level functions
3 *
4 * Copyright (C) 2012 Marvell
5 *
6 * Gregory CLEMENT <gregory.clement@free-electrons.com>
7 *
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.
11 *
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.
17 */
18
19#include <linux/linkage.h>
20#define ARMADA_XP_CFB_CTL_REG_OFFSET 0x0
21#define ARMADA_XP_CFB_CFG_REG_OFFSET 0x4
22
23	.text
24/*
25 * r0: Coherency fabric base register address
26 * r1: HW CPU id
27 */
28ENTRY(ll_set_cpu_coherent)
29	/* Create bit by cpu index */
30	mov	r3, #(1 << 24)
31	lsl	r1, r3, r1
32
33	/* Add CPU to SMP group - Atomic */
34	add	r3, r0, #ARMADA_XP_CFB_CTL_REG_OFFSET
35	ldr	r2, [r3]
36	orr	r2, r2, r1
37	str	r2, [r3]
38
39	/* Enable coherency on CPU - Atomic */
40	add	r3, r0, #ARMADA_XP_CFB_CFG_REG_OFFSET
41	ldr	r2, [r3]
42	orr	r2, r2, r1
43	str	r2, [r3]
44
45	dsb
46
47	mov	r0, #0
48	mov	pc, lr
49ENDPROC(ll_set_cpu_coherent)
50