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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 | ||
19 | #include <linux/kernel.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/of_address.h> | |
22 | #include <linux/io.h> | |
23 | #include <linux/smp.h> | |
24 | #include <asm/smp_plat.h> | |
25 | ||
26 | static void __iomem *pmsu_mp_base; | |
27 | static void __iomem *pmsu_reset_base; | |
28 | ||
29 | #define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x24) | |
30 | #define PMSU_RESET_CTL_OFFSET(cpu) (cpu * 0x8) | |
31 | ||
32 | static struct of_device_id of_pmsu_table[] = { | |
33 | {.compatible = "marvell,armada-370-xp-pmsu"}, | |
34 | { /* end of list */ }, | |
35 | }; | |
36 | ||
37 | #ifdef CONFIG_SMP | |
38 | int armada_xp_boot_cpu(unsigned int cpu_id, void *boot_addr) | |
39 | { | |
40 | int reg, hw_cpu; | |
41 | ||
42 | if (!pmsu_mp_base || !pmsu_reset_base) { | |
43 | pr_warn("Can't boot CPU. PMSU is uninitialized\n"); | |
44 | return 1; | |
45 | } | |
46 | ||
47 | hw_cpu = cpu_logical_map(cpu_id); | |
48 | ||
49 | writel(virt_to_phys(boot_addr), pmsu_mp_base + | |
50 | PMSU_BOOT_ADDR_REDIRECT_OFFSET(hw_cpu)); | |
51 | ||
52 | /* Release CPU from reset by clearing reset bit*/ | |
53 | reg = readl(pmsu_reset_base + PMSU_RESET_CTL_OFFSET(hw_cpu)); | |
54 | reg &= (~0x1); | |
55 | writel(reg, pmsu_reset_base + PMSU_RESET_CTL_OFFSET(hw_cpu)); | |
56 | ||
57 | return 0; | |
58 | } | |
59 | #endif | |
60 | ||
61 | int __init armada_370_xp_pmsu_init(void) | |
62 | { | |
63 | struct device_node *np; | |
64 | ||
65 | np = of_find_matching_node(NULL, of_pmsu_table); | |
66 | if (np) { | |
67 | pr_info("Initializing Power Management Service Unit\n"); | |
68 | pmsu_mp_base = of_iomap(np, 0); | |
69 | pmsu_reset_base = of_iomap(np, 1); | |
70 | } | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
75 | early_initcall(armada_370_xp_pmsu_init); |