1 /* 2 * arch/arm/mach-mediatek/platsmp.c 3 * 4 * Copyright (c) 2014 Mediatek Inc. 5 * Author: Shunli Wang <shunli.wang@mediatek.com> 6 * Yingjoe Chen <yingjoe.chen@mediatek.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 */ 18 #include <linux/io.h> 19 #include <linux/memblock.h> 20 #include <linux/of.h> 21 #include <linux/of_address.h> 22 #include <linux/string.h> 23 #include <linux/threads.h> 24 25 #define MTK_MAX_CPU 8 26 #define MTK_SMP_REG_SIZE 0x1000 27 28 struct mtk_smp_boot_info { 29 unsigned long smp_base; 30 unsigned int jump_reg; 31 unsigned int core_keys[MTK_MAX_CPU - 1]; 32 unsigned int core_regs[MTK_MAX_CPU - 1]; 33 }; 34 35 static const struct mtk_smp_boot_info mtk_mt8135_tz_boot = { 36 0x80002000, 0x3fc, 37 { 0x534c4131, 0x4c415332, 0x41534c33 }, 38 { 0x3f8, 0x3f8, 0x3f8 }, 39 }; 40 41 static const struct mtk_smp_boot_info mtk_mt6589_boot = { 42 0x10002000, 0x34, 43 { 0x534c4131, 0x4c415332, 0x41534c33 }, 44 { 0x38, 0x3c, 0x40 }, 45 }; 46 47 static const struct of_device_id mtk_tz_smp_boot_infos[] __initconst = { 48 { .compatible = "mediatek,mt8135", .data = &mtk_mt8135_tz_boot }, 49 { .compatible = "mediatek,mt8127", .data = &mtk_mt8135_tz_boot }, 50 }; 51 52 static const struct of_device_id mtk_smp_boot_infos[] __initconst = { 53 { .compatible = "mediatek,mt6589", .data = &mtk_mt6589_boot }, 54 }; 55 56 static void __iomem *mtk_smp_base; 57 static const struct mtk_smp_boot_info *mtk_smp_info; 58 59 static int mtk_boot_secondary(unsigned int cpu, struct task_struct *idle) 60 { 61 if (!mtk_smp_base) 62 return -EINVAL; 63 64 if (!mtk_smp_info->core_keys[cpu-1]) 65 return -EINVAL; 66 67 writel_relaxed(mtk_smp_info->core_keys[cpu-1], 68 mtk_smp_base + mtk_smp_info->core_regs[cpu-1]); 69 70 arch_send_wakeup_ipi_mask(cpumask_of(cpu)); 71 72 return 0; 73 } 74 75 static void __init __mtk_smp_prepare_cpus(unsigned int max_cpus, int trustzone) 76 { 77 int i, num; 78 const struct of_device_id *infos; 79 80 if (trustzone) { 81 num = ARRAY_SIZE(mtk_tz_smp_boot_infos); 82 infos = mtk_tz_smp_boot_infos; 83 } else { 84 num = ARRAY_SIZE(mtk_smp_boot_infos); 85 infos = mtk_smp_boot_infos; 86 } 87 88 /* Find smp boot info for this SoC */ 89 for (i = 0; i < num; i++) { 90 if (of_machine_is_compatible(infos[i].compatible)) { 91 mtk_smp_info = infos[i].data; 92 break; 93 } 94 } 95 96 if (!mtk_smp_info) { 97 pr_err("%s: Device is not supported\n", __func__); 98 return; 99 } 100 101 if (trustzone) { 102 /* smp_base(trustzone-bootinfo) is reserved by device tree */ 103 mtk_smp_base = phys_to_virt(mtk_smp_info->smp_base); 104 } else { 105 mtk_smp_base = ioremap(mtk_smp_info->smp_base, MTK_SMP_REG_SIZE); 106 if (!mtk_smp_base) { 107 pr_err("%s: Can't remap %lx\n", __func__, 108 mtk_smp_info->smp_base); 109 return; 110 } 111 } 112 113 /* 114 * write the address of slave startup address into the system-wide 115 * jump register 116 */ 117 writel_relaxed(virt_to_phys(secondary_startup_arm), 118 mtk_smp_base + mtk_smp_info->jump_reg); 119 } 120 121 static void __init mtk_tz_smp_prepare_cpus(unsigned int max_cpus) 122 { 123 __mtk_smp_prepare_cpus(max_cpus, 1); 124 } 125 126 static void __init mtk_smp_prepare_cpus(unsigned int max_cpus) 127 { 128 __mtk_smp_prepare_cpus(max_cpus, 0); 129 } 130 131 static struct smp_operations mt81xx_tz_smp_ops __initdata = { 132 .smp_prepare_cpus = mtk_tz_smp_prepare_cpus, 133 .smp_boot_secondary = mtk_boot_secondary, 134 }; 135 CPU_METHOD_OF_DECLARE(mt81xx_tz_smp, "mediatek,mt81xx-tz-smp", &mt81xx_tz_smp_ops); 136 137 static struct smp_operations mt6589_smp_ops __initdata = { 138 .smp_prepare_cpus = mtk_smp_prepare_cpus, 139 .smp_boot_secondary = mtk_boot_secondary, 140 }; 141 CPU_METHOD_OF_DECLARE(mt6589_smp, "mediatek,mt6589-smp", &mt6589_smp_ops); 142