1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Common prep/pmac/chrp boot and setup code. 4 */ 5 6 #include <linux/module.h> 7 #include <linux/string.h> 8 #include <linux/sched.h> 9 #include <linux/init.h> 10 #include <linux/kernel.h> 11 #include <linux/reboot.h> 12 #include <linux/delay.h> 13 #include <linux/initrd.h> 14 #include <linux/tty.h> 15 #include <linux/seq_file.h> 16 #include <linux/root_dev.h> 17 #include <linux/cpu.h> 18 #include <linux/console.h> 19 #include <linux/memblock.h> 20 #include <linux/export.h> 21 #include <linux/nvram.h> 22 #include <linux/pgtable.h> 23 #include <linux/of_fdt.h> 24 #include <linux/irq.h> 25 26 #include <asm/io.h> 27 #include <asm/processor.h> 28 #include <asm/setup.h> 29 #include <asm/smp.h> 30 #include <asm/elf.h> 31 #include <asm/cputable.h> 32 #include <asm/bootx.h> 33 #include <asm/btext.h> 34 #include <asm/machdep.h> 35 #include <linux/uaccess.h> 36 #include <asm/pmac_feature.h> 37 #include <asm/sections.h> 38 #include <asm/nvram.h> 39 #include <asm/xmon.h> 40 #include <asm/time.h> 41 #include <asm/serial.h> 42 #include <asm/udbg.h> 43 #include <asm/code-patching.h> 44 #include <asm/cpu_has_feature.h> 45 #include <asm/asm-prototypes.h> 46 #include <asm/kdump.h> 47 #include <asm/feature-fixups.h> 48 #include <asm/early_ioremap.h> 49 50 #include "setup.h" 51 52 #define DBG(fmt...) 53 54 extern void bootx_init(unsigned long r4, unsigned long phys); 55 56 int boot_cpuid_phys; 57 EXPORT_SYMBOL_GPL(boot_cpuid_phys); 58 59 int smp_hw_index[NR_CPUS]; 60 EXPORT_SYMBOL(smp_hw_index); 61 62 unsigned int DMA_MODE_READ; 63 unsigned int DMA_MODE_WRITE; 64 65 EXPORT_SYMBOL(DMA_MODE_READ); 66 EXPORT_SYMBOL(DMA_MODE_WRITE); 67 68 /* 69 * This is run before start_kernel(), the kernel has been relocated 70 * and we are running with enough of the MMU enabled to have our 71 * proper kernel virtual addresses 72 * 73 * We do the initial parsing of the flat device-tree and prepares 74 * for the MMU to be fully initialized. 75 */ 76 notrace void __init machine_init(u64 dt_ptr) 77 { 78 u32 *addr = (u32 *)patch_site_addr(&patch__memset_nocache); 79 ppc_inst_t insn; 80 81 /* Configure static keys first, now that we're relocated. */ 82 setup_feature_keys(); 83 84 early_ioremap_init(); 85 86 /* Enable early debugging if any specified (see udbg.h) */ 87 udbg_early_init(); 88 89 patch_instruction_site(&patch__memcpy_nocache, ppc_inst(PPC_RAW_NOP())); 90 91 create_cond_branch(&insn, addr, branch_target(addr), 0x820000); 92 patch_instruction(addr, insn); /* replace b by bne cr0 */ 93 94 /* Do some early initialization based on the flat device tree */ 95 early_init_devtree(__va(dt_ptr)); 96 97 early_init_mmu(); 98 99 setup_kdump_trampoline(); 100 } 101 102 /* Checks "l2cr=xxxx" command-line option */ 103 static int __init ppc_setup_l2cr(char *str) 104 { 105 if (cpu_has_feature(CPU_FTR_L2CR)) { 106 unsigned long val = simple_strtoul(str, NULL, 0); 107 printk(KERN_INFO "l2cr set to %lx\n", val); 108 _set_L2CR(0); /* force invalidate by disable cache */ 109 _set_L2CR(val); /* and enable it */ 110 } 111 return 1; 112 } 113 __setup("l2cr=", ppc_setup_l2cr); 114 115 /* Checks "l3cr=xxxx" command-line option */ 116 static int __init ppc_setup_l3cr(char *str) 117 { 118 if (cpu_has_feature(CPU_FTR_L3CR)) { 119 unsigned long val = simple_strtoul(str, NULL, 0); 120 printk(KERN_INFO "l3cr set to %lx\n", val); 121 _set_L3CR(val); /* and enable it */ 122 } 123 return 1; 124 } 125 __setup("l3cr=", ppc_setup_l3cr); 126 127 static int __init ppc_init(void) 128 { 129 /* clear the progress line */ 130 if (ppc_md.progress) 131 ppc_md.progress(" ", 0xffff); 132 133 /* call platform init */ 134 if (ppc_md.init != NULL) { 135 ppc_md.init(); 136 } 137 return 0; 138 } 139 arch_initcall(ppc_init); 140 141 static void *__init alloc_stack(void) 142 { 143 void *ptr = memblock_alloc(THREAD_SIZE, THREAD_ALIGN); 144 145 if (!ptr) 146 panic("cannot allocate %d bytes for stack at %pS\n", 147 THREAD_SIZE, (void *)_RET_IP_); 148 149 return ptr; 150 } 151 152 void __init irqstack_early_init(void) 153 { 154 unsigned int i; 155 156 if (IS_ENABLED(CONFIG_VMAP_STACK)) 157 return; 158 159 /* interrupt stacks must be in lowmem, we get that for free on ppc32 160 * as the memblock is limited to lowmem by default */ 161 for_each_possible_cpu(i) { 162 softirq_ctx[i] = alloc_stack(); 163 hardirq_ctx[i] = alloc_stack(); 164 } 165 } 166 167 #ifdef CONFIG_VMAP_STACK 168 void *emergency_ctx[NR_CPUS] __ro_after_init = {[0] = &init_stack}; 169 170 void __init emergency_stack_init(void) 171 { 172 unsigned int i; 173 174 for_each_possible_cpu(i) 175 emergency_ctx[i] = alloc_stack(); 176 } 177 #endif 178 179 #ifdef CONFIG_BOOKE_OR_40x 180 void __init exc_lvl_early_init(void) 181 { 182 unsigned int i, hw_cpu; 183 184 /* interrupt stacks must be in lowmem, we get that for free on ppc32 185 * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */ 186 for_each_possible_cpu(i) { 187 #ifdef CONFIG_SMP 188 hw_cpu = get_hard_smp_processor_id(i); 189 #else 190 hw_cpu = 0; 191 #endif 192 193 critirq_ctx[hw_cpu] = alloc_stack(); 194 #ifdef CONFIG_BOOKE 195 dbgirq_ctx[hw_cpu] = alloc_stack(); 196 mcheckirq_ctx[hw_cpu] = alloc_stack(); 197 #endif 198 } 199 } 200 #endif 201 202 void __init setup_power_save(void) 203 { 204 #ifdef CONFIG_PPC_BOOK3S_32 205 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 206 cpu_has_feature(CPU_FTR_CAN_NAP)) 207 ppc_md.power_save = ppc6xx_idle; 208 #endif 209 210 #ifdef CONFIG_PPC_E500 211 if (cpu_has_feature(CPU_FTR_CAN_DOZE) || 212 cpu_has_feature(CPU_FTR_CAN_NAP)) 213 ppc_md.power_save = e500_idle; 214 #endif 215 } 216 217 __init void initialize_cache_info(void) 218 { 219 /* 220 * Set cache line size based on type of cpu as a default. 221 * Systems with OF can look in the properties on the cpu node(s) 222 * for a possibly more accurate value. 223 */ 224 dcache_bsize = cur_cpu_spec->dcache_bsize; 225 icache_bsize = cur_cpu_spec->icache_bsize; 226 } 227