1/*
2 * R-Car Generation 2 Power management support
3 *
4 * Copyright (C) 2013 - 2015  Renesas Electronics Corporation
5 * Copyright (C) 2011  Renesas Solutions Corp.
6 * Copyright (C) 2011  Magnus Damm
7 *
8 * This file is subject to the terms and conditions of the GNU General Public
9 * License.  See the file "COPYING" in the main directory of this archive
10 * for more details.
11 */
12
13#include <linux/kernel.h>
14#include <linux/of.h>
15#include <linux/smp.h>
16#include <asm/io.h>
17#include "common.h"
18#include "pm-rcar.h"
19#include "rcar-gen2.h"
20
21/* RST */
22#define RST		0xe6160000
23#define CA15BAR		0x0020
24#define CA7BAR		0x0030
25#define CA15RESCNT	0x0040
26#define CA7RESCNT	0x0044
27
28/* On-chip RAM */
29#define MERAM		0xe8080000
30#define RAM		0xe6300000
31
32/* SYSC */
33#define SYSCIER 0x0c
34#define SYSCIMR 0x10
35
36#if defined(CONFIG_SMP)
37
38static void __init rcar_gen2_sysc_init(u32 syscier)
39{
40	void __iomem *base = rcar_sysc_init(0xe6180000);
41
42	/* enable all interrupt sources, but do not use interrupt handler */
43	iowrite32(syscier, base + SYSCIER);
44	iowrite32(0, base + SYSCIMR);
45}
46
47#else /* CONFIG_SMP */
48
49static inline void rcar_gen2_sysc_init(u32 syscier) {}
50
51#endif /* CONFIG_SMP */
52
53void __init rcar_gen2_pm_init(void)
54{
55	void __iomem *p;
56	u32 bar;
57	static int once;
58	struct device_node *np, *cpus;
59	bool has_a7 = false;
60	bool has_a15 = false;
61	phys_addr_t boot_vector_addr = 0;
62	u32 syscier = 0;
63
64	if (once++)
65		return;
66
67	cpus = of_find_node_by_path("/cpus");
68	if (!cpus)
69		return;
70
71	for_each_child_of_node(cpus, np) {
72		if (of_device_is_compatible(np, "arm,cortex-a15"))
73			has_a15 = true;
74		else if (of_device_is_compatible(np, "arm,cortex-a7"))
75			has_a7 = true;
76	}
77
78	if (of_machine_is_compatible("renesas,r8a7790")) {
79		boot_vector_addr = MERAM;
80		syscier = 0x013111ef;
81
82	} else if (of_machine_is_compatible("renesas,r8a7791")) {
83		boot_vector_addr = RAM;
84		syscier = 0x00111003;
85	}
86
87	/* RAM for jump stub, because BAR requires 256KB aligned address */
88	p = ioremap_nocache(boot_vector_addr, shmobile_boot_size);
89	memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
90	iounmap(p);
91
92	/* setup reset vectors */
93	p = ioremap_nocache(RST, 0x63);
94	bar = (boot_vector_addr >> 8) & 0xfffffc00;
95	if (has_a15) {
96		writel_relaxed(bar, p + CA15BAR);
97		writel_relaxed(bar | 0x10, p + CA15BAR);
98
99		/* de-assert reset for CA15 CPUs */
100		writel_relaxed((readl_relaxed(p + CA15RESCNT) & ~0x0f) |
101				0xa5a50000, p + CA15RESCNT);
102	}
103	if (has_a7) {
104		writel_relaxed(bar, p + CA7BAR);
105		writel_relaxed(bar | 0x10, p + CA7BAR);
106
107		/* de-assert reset for CA7 CPUs */
108		writel_relaxed((readl_relaxed(p + CA7RESCNT) & ~0x0f) |
109				0x5a5a0000, p + CA7RESCNT);
110	}
111	iounmap(p);
112
113	rcar_gen2_sysc_init(syscier);
114	shmobile_smp_apmu_suspend_init();
115}
116