2 * Power Management Service Unit(PMSU) support for Armada 370/XP platforms.
4 * Copyright (C) 2012 Marvell
6 * Yehuda Yitschak <yehuday@marvell.com>
7 * Gregory Clement <gregory.clement@free-electrons.com>
8 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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.
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
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/of_address.h>
23 #include <linux/smp.h>
24 #include <asm/smp_plat.h>
26 static void __iomem
*pmsu_mp_base
;
27 static void __iomem
*pmsu_reset_base
;
29 #define PMSU_BOOT_ADDR_REDIRECT_OFFSET(cpu) ((cpu * 0x100) + 0x24)
30 #define PMSU_RESET_CTL_OFFSET(cpu) (cpu * 0x8)
32 static struct of_device_id of_pmsu_table
[] = {
33 {.compatible
= "marvell,armada-370-xp-pmsu"},
34 { /* end of list */ },
38 int armada_xp_boot_cpu(unsigned int cpu_id
, void *boot_addr
)
42 if (!pmsu_mp_base
|| !pmsu_reset_base
) {
43 pr_warn("Can't boot CPU. PMSU is uninitialized\n");
47 hw_cpu
= cpu_logical_map(cpu_id
);
49 writel(virt_to_phys(boot_addr
), pmsu_mp_base
+
50 PMSU_BOOT_ADDR_REDIRECT_OFFSET(hw_cpu
));
52 /* Release CPU from reset by clearing reset bit*/
53 reg
= readl(pmsu_reset_base
+ PMSU_RESET_CTL_OFFSET(hw_cpu
));
55 writel(reg
, pmsu_reset_base
+ PMSU_RESET_CTL_OFFSET(hw_cpu
));
61 int __init
armada_370_xp_pmsu_init(void)
63 struct device_node
*np
;
65 np
= of_find_matching_node(NULL
, of_pmsu_table
);
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);
76 early_initcall(armada_370_xp_pmsu_init
);