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 mtk_smp_boot_info mtk_mt7623_boot = { 48 0x10202000, 0x34, 49 { 0x534c4131, 0x4c415332, 0x41534c33 }, 50 { 0x38, 0x3c, 0x40 }, 51 }; 52 53 static const struct of_device_id mtk_tz_smp_boot_infos[] __initconst = { 54 { .compatible = "mediatek,mt8135", .data = &mtk_mt8135_tz_boot }, 55 { .compatible = "mediatek,mt8127", .data = &mtk_mt8135_tz_boot }, 56 }; 57 58 static const struct of_device_id mtk_smp_boot_infos[] __initconst = { 59 { .compatible = "mediatek,mt6589", .data = &mtk_mt6589_boot }, 60 { .compatible = "mediatek,mt7623", .data = &mtk_mt7623_boot }, 61 }; 62 63 static void __iomem *mtk_smp_base; 64 static const struct mtk_smp_boot_info *mtk_smp_info; 65 66 static int mtk_boot_secondary(unsigned int cpu, struct task_struct *idle) 67 { 68 if (!mtk_smp_base) 69 return -EINVAL; 70 71 if (!mtk_smp_info->core_keys[cpu-1]) 72 return -EINVAL; 73 74 writel_relaxed(mtk_smp_info->core_keys[cpu-1], 75 mtk_smp_base + mtk_smp_info->core_regs[cpu-1]); 76 77 arch_send_wakeup_ipi_mask(cpumask_of(cpu)); 78 79 return 0; 80 } 81 82 static void __init __mtk_smp_prepare_cpus(unsigned int max_cpus, int trustzone) 83 { 84 int i, num; 85 const struct of_device_id *infos; 86 87 if (trustzone) { 88 num = ARRAY_SIZE(mtk_tz_smp_boot_infos); 89 infos = mtk_tz_smp_boot_infos; 90 } else { 91 num = ARRAY_SIZE(mtk_smp_boot_infos); 92 infos = mtk_smp_boot_infos; 93 } 94 95 /* Find smp boot info for this SoC */ 96 for (i = 0; i < num; i++) { 97 if (of_machine_is_compatible(infos[i].compatible)) { 98 mtk_smp_info = infos[i].data; 99 break; 100 } 101 } 102 103 if (!mtk_smp_info) { 104 pr_err("%s: Device is not supported\n", __func__); 105 return; 106 } 107 108 if (trustzone) { 109 /* smp_base(trustzone-bootinfo) is reserved by device tree */ 110 mtk_smp_base = phys_to_virt(mtk_smp_info->smp_base); 111 } else { 112 mtk_smp_base = ioremap(mtk_smp_info->smp_base, MTK_SMP_REG_SIZE); 113 if (!mtk_smp_base) { 114 pr_err("%s: Can't remap %lx\n", __func__, 115 mtk_smp_info->smp_base); 116 return; 117 } 118 } 119 120 /* 121 * write the address of slave startup address into the system-wide 122 * jump register 123 */ 124 writel_relaxed(virt_to_phys(secondary_startup_arm), 125 mtk_smp_base + mtk_smp_info->jump_reg); 126 } 127 128 static void __init mtk_tz_smp_prepare_cpus(unsigned int max_cpus) 129 { 130 __mtk_smp_prepare_cpus(max_cpus, 1); 131 } 132 133 static void __init mtk_smp_prepare_cpus(unsigned int max_cpus) 134 { 135 __mtk_smp_prepare_cpus(max_cpus, 0); 136 } 137 138 static const struct smp_operations mt81xx_tz_smp_ops __initconst = { 139 .smp_prepare_cpus = mtk_tz_smp_prepare_cpus, 140 .smp_boot_secondary = mtk_boot_secondary, 141 }; 142 CPU_METHOD_OF_DECLARE(mt81xx_tz_smp, "mediatek,mt81xx-tz-smp", &mt81xx_tz_smp_ops); 143 144 static const struct smp_operations mt6589_smp_ops __initconst = { 145 .smp_prepare_cpus = mtk_smp_prepare_cpus, 146 .smp_boot_secondary = mtk_boot_secondary, 147 }; 148 CPU_METHOD_OF_DECLARE(mt6589_smp, "mediatek,mt6589-smp", &mt6589_smp_ops); 149