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Magnus Damm687c27b2013-10-01 17:13:16 +09001/*
2 * SMP support for r8a7791
3 *
4 * Copyright (C) 2013 Renesas Solutions Corp.
5 * Copyright (C) 2013 Magnus Damm
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 as published by
9 * the Free Software Foundation; version 2 of the License.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16#include <linux/kernel.h>
17#include <linux/init.h>
18#include <linux/smp.h>
19#include <linux/io.h>
20#include <asm/smp_plat.h>
21#include <mach/common.h>
22#include <mach/r8a7791.h>
23
24#define RST 0xe6160000
25#define CA15BAR 0x0020
26#define CA15RESCNT 0x0040
27#define RAM 0xe6300000
28
29static void __init r8a7791_smp_prepare_cpus(unsigned int max_cpus)
30{
31 void __iomem *p;
32 u32 bar;
33
34 /* let APMU code install data related to shmobile_boot_vector */
35 shmobile_smp_apmu_prepare_cpus(max_cpus);
36
37 /* RAM for jump stub, because BAR requires 256KB aligned address */
38 p = ioremap_nocache(RAM, shmobile_boot_size);
39 memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
40 iounmap(p);
41
42 /* setup reset vectors */
43 p = ioremap_nocache(RST, 0x63);
44 bar = (RAM >> 8) & 0xfffffc00;
45 writel_relaxed(bar, p + CA15BAR);
46 writel_relaxed(bar | 0x10, p + CA15BAR);
47
48 /* enable clocks to all CPUs */
49 writel_relaxed((readl_relaxed(p + CA15RESCNT) & ~0x0f) | 0xa5a50000,
50 p + CA15RESCNT);
51 iounmap(p);
52}
53
54struct smp_operations r8a7791_smp_ops __initdata = {
55 .smp_prepare_cpus = r8a7791_smp_prepare_cpus,
56 .smp_boot_secondary = shmobile_smp_apmu_boot_secondary,
57#ifdef CONFIG_HOTPLUG_CPU
58 .cpu_disable = shmobile_smp_cpu_disable,
59 .cpu_die = shmobile_smp_apmu_cpu_die,
60 .cpu_kill = shmobile_smp_apmu_cpu_kill,
61#endif
62};