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); 76