Commit | Line | Data |
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7444dad2 GC |
1 | /* |
2 | * Power Management Service Unit(PMSU) support for Armada 370/XP platforms. | |
3 | * | |
4 | * Copyright (C) 2012 Marvell | |
5 | * | |
6 | * Yehuda Yitschak <yehuday@marvell.com> | |
7 | * Gregory Clement <gregory.clement@free-electrons.com> | |
8 | * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | |
9 | * | |
10 | * This file is licensed under the terms of the GNU General Public | |
11 | * License version 2. This program is licensed "as is" without any | |
12 | * warranty of any kind, whether express or implied. | |
13 | * | |
14 | * The Armada 370 and Armada XP SOCs have a power management service | |
15 | * unit which is responsible for powering down and waking up CPUs and | |
16 | * other SOC units | |
17 | */ | |
18 | ||
bd045a1e TP |
19 | #define pr_fmt(fmt) "mvebu-pmsu: " fmt |
20 | ||
7444dad2 GC |
21 | #include <linux/kernel.h> |
22 | #include <linux/init.h> | |
23 | #include <linux/of_address.h> | |
24 | #include <linux/io.h> | |
25 | #include <linux/smp.h> | |
49754ffe | 26 | #include <linux/resource.h> |
7444dad2 | 27 | #include <asm/smp_plat.h> |
49754ffe | 28 | #include "common.h" |
b12634e3 | 29 | #include "pmsu.h" |
7444dad2 GC |
30 | |
31 | static void __iomem *pmsu_mp_base; | |
7444dad2 | 32 | |
0c3acc74 GC |
33 | #define PMSU_BASE_OFFSET 0x100 |
34 | #define PMSU_REG_SIZE 0x1000 | |
35 | ||
36 | #define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x124) | |
7444dad2 GC |
37 | |
38 | static struct of_device_id of_pmsu_table[] = { | |
0c3acc74 GC |
39 | { .compatible = "marvell,armada-370-pmsu", }, |
40 | { .compatible = "marvell,armada-370-xp-pmsu", }, | |
b4bca249 | 41 | { .compatible = "marvell,armada-380-pmsu", }, |
7444dad2 GC |
42 | { /* end of list */ }, |
43 | }; | |
44 | ||
05ad6906 | 45 | void mvebu_pmsu_set_cpu_boot_addr(int hw_cpu, void *boot_addr) |
02e7b067 GC |
46 | { |
47 | writel(virt_to_phys(boot_addr), pmsu_mp_base + | |
48 | PMSU_BOOT_ADDR_REDIRECT_OFFSET(hw_cpu)); | |
49 | } | |
50 | ||
b12634e3 | 51 | static int __init armada_370_xp_pmsu_init(void) |
7444dad2 GC |
52 | { |
53 | struct device_node *np; | |
bd045a1e TP |
54 | struct resource res; |
55 | int ret = 0; | |
7444dad2 GC |
56 | |
57 | np = of_find_matching_node(NULL, of_pmsu_table); | |
bd045a1e TP |
58 | if (!np) |
59 | return 0; | |
60 | ||
61 | pr_info("Initializing Power Management Service Unit\n"); | |
62 | ||
63 | if (of_address_to_resource(np, 0, &res)) { | |
64 | pr_err("unable to get resource\n"); | |
65 | ret = -ENOENT; | |
66 | goto out; | |
7444dad2 GC |
67 | } |
68 | ||
0c3acc74 GC |
69 | if (of_device_is_compatible(np, "marvell,armada-370-xp-pmsu")) { |
70 | pr_warn(FW_WARN "deprecated pmsu binding\n"); | |
71 | res.start = res.start - PMSU_BASE_OFFSET; | |
72 | res.end = res.start + PMSU_REG_SIZE - 1; | |
73 | } | |
74 | ||
bd045a1e TP |
75 | if (!request_mem_region(res.start, resource_size(&res), |
76 | np->full_name)) { | |
77 | pr_err("unable to request region\n"); | |
78 | ret = -EBUSY; | |
79 | goto out; | |
80 | } | |
81 | ||
82 | pmsu_mp_base = ioremap(res.start, resource_size(&res)); | |
83 | if (!pmsu_mp_base) { | |
84 | pr_err("unable to map registers\n"); | |
85 | release_mem_region(res.start, resource_size(&res)); | |
86 | ret = -ENOMEM; | |
87 | goto out; | |
88 | } | |
89 | ||
90 | out: | |
91 | of_node_put(np); | |
92 | return ret; | |
7444dad2 GC |
93 | } |
94 | ||
95 | early_initcall(armada_370_xp_pmsu_init); |