arch/powerpc/kernel/setup_32.c

   1 /*
   2  * Common prep/pmac/chrp boot and setup code.
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/string.h>
   7 #include <linux/sched.h>
   8 #include <linux/init.h>
   9 #include <linux/kernel.h>
  10 #include <linux/reboot.h>
  11 #include <linux/delay.h>
  12 #include <linux/initrd.h>
  13 #include <linux/tty.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/root_dev.h>
  16 #include <linux/cpu.h>
  17 #include <linux/console.h>
  18 #include <linux/memblock.h>
  19 #include <linux/export.h>
  20
  21 #include <asm/io.h>
  22 #include <asm/prom.h>
  23 #include <asm/processor.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/setup.h>
  26 #include <asm/smp.h>
  27 #include <asm/elf.h>
  28 #include <asm/cputable.h>
  29 #include <asm/bootx.h>
  30 #include <asm/btext.h>
  31 #include <asm/machdep.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/pmac_feature.h>
  34 #include <asm/sections.h>
  35 #include <asm/nvram.h>
  36 #include <asm/xmon.h>
  37 #include <asm/time.h>
  38 #include <asm/serial.h>
  39 #include <asm/udbg.h>
  40 #include <asm/code-patching.h>
  41 #include <asm/cpu_has_feature.h>
  42
  43 #define DBG(fmt...)
  44
  45 extern void bootx_init(unsigned long r4, unsigned long phys);
  46
  47 int boot_cpuid_phys;
  48 EXPORT_SYMBOL_GPL(boot_cpuid_phys);
  49
  50 int smp_hw_index[NR_CPUS];
  51 EXPORT_SYMBOL(smp_hw_index);
  52
  53 unsigned long ISA_DMA_THRESHOLD;
  54 unsigned int DMA_MODE_READ;
  55 unsigned int DMA_MODE_WRITE;
  56
  57 EXPORT_SYMBOL(ISA_DMA_THRESHOLD);
  58 EXPORT_SYMBOL(DMA_MODE_READ);
  59 EXPORT_SYMBOL(DMA_MODE_WRITE);
  60
  61 /*
  62  * These are used in binfmt_elf.c to put aux entries on the stack
  63  * for each elf executable being started.
  64  */
  65 int dcache_bsize;
  66 int icache_bsize;
  67 int ucache_bsize;
  68
  69 /*
  70  * We're called here very early in the boot.
  71  *
  72  * Note that the kernel may be running at an address which is different
  73  * from the address that it was linked at, so we must use RELOC/PTRRELOC
  74  * to access static data (including strings).  -- paulus
  75  */
  76 notrace unsigned long __init early_init(unsigned long dt_ptr)
  77 {
  78         unsigned long offset = reloc_offset();
  79
  80         /* First zero the BSS -- use memset_io, some platforms don't have
  81          * caches on yet */
  82         memset_io((void __iomem *)PTRRELOC(&__bss_start), 0,
  83                         __bss_stop - __bss_start);
  84
  85         /*
  86          * Identify the CPU type and fix up code sections
  87          * that depend on which cpu we have.
  88          */
  89         identify_cpu(offset, mfspr(SPRN_PVR));
  90
  91         apply_feature_fixups();
  92
  93         return KERNELBASE + offset;
  94 }
  95
  96
  97 /*
  98  * This is run before start_kernel(), the kernel has been relocated
  99  * and we are running with enough of the MMU enabled to have our
 100  * proper kernel virtual addresses
 101  *
 102  * We do the initial parsing of the flat device-tree and prepares
 103  * for the MMU to be fully initialized.
 104  */
 105 extern unsigned int memset_nocache_branch; /* Insn to be replaced by NOP */
 106
 107 notrace void __init machine_init(u64 dt_ptr)
 108 {
 109         /* Configure static keys first, now that we're relocated. */
 110         setup_feature_keys();
 111
 112         /* Enable early debugging if any specified (see udbg.h) */
 113         udbg_early_init();
 114
 115         patch_instruction((unsigned int *)&memcpy, PPC_INST_NOP);
 116         patch_instruction(&memset_nocache_branch, PPC_INST_NOP);
 117
 118         /* Do some early initialization based on the flat device tree */
 119         early_init_devtree(__va(dt_ptr));
 120
 121         early_init_mmu();
 122
 123         setup_kdump_trampoline();
 124 }
 125
 126 /* Checks "l2cr=xxxx" command-line option */
 127 int __init ppc_setup_l2cr(char *str)
 128 {
 129         if (cpu_has_feature(CPU_FTR_L2CR)) {
 130                 unsigned long val = simple_strtoul(str, NULL, 0);
 131                 printk(KERN_INFO "l2cr set to %lx\n", val);
 132                 _set_L2CR(0);           /* force invalidate by disable cache */
 133                 _set_L2CR(val);         /* and enable it */
 134         }
 135         return 1;
 136 }
 137 __setup("l2cr=", ppc_setup_l2cr);
 138
 139 /* Checks "l3cr=xxxx" command-line option */
 140 int __init ppc_setup_l3cr(char *str)
 141 {
 142         if (cpu_has_feature(CPU_FTR_L3CR)) {
 143                 unsigned long val = simple_strtoul(str, NULL, 0);
 144                 printk(KERN_INFO "l3cr set to %lx\n", val);
 145                 _set_L3CR(val);         /* and enable it */
 146         }
 147         return 1;
 148 }
 149 __setup("l3cr=", ppc_setup_l3cr);
 150
 151 #ifdef CONFIG_GENERIC_NVRAM
 152
 153 /* Generic nvram hooks used by drivers/char/gen_nvram.c */
 154 unsigned char nvram_read_byte(int addr)
 155 {
 156         if (ppc_md.nvram_read_val)
 157                 return ppc_md.nvram_read_val(addr);
 158         return 0xff;
 159 }
 160 EXPORT_SYMBOL(nvram_read_byte);
 161
 162 void nvram_write_byte(unsigned char val, int addr)
 163 {
 164         if (ppc_md.nvram_write_val)
 165                 ppc_md.nvram_write_val(addr, val);
 166 }
 167 EXPORT_SYMBOL(nvram_write_byte);
 168
 169 ssize_t nvram_get_size(void)
 170 {
 171         if (ppc_md.nvram_size)
 172                 return ppc_md.nvram_size();
 173         return -1;
 174 }
 175 EXPORT_SYMBOL(nvram_get_size);
 176
 177 void nvram_sync(void)
 178 {
 179         if (ppc_md.nvram_sync)
 180                 ppc_md.nvram_sync();
 181 }
 182 EXPORT_SYMBOL(nvram_sync);
 183
 184 #endif /* CONFIG_NVRAM */
 185
 186 int __init ppc_init(void)
 187 {
 188         /* clear the progress line */
 189         if (ppc_md.progress)
 190                 ppc_md.progress("             ", 0xffff);
 191
 192         /* call platform init */
 193         if (ppc_md.init != NULL) {
 194                 ppc_md.init();
 195         }
 196         return 0;
 197 }
 198
 199 arch_initcall(ppc_init);
 200
 201 void __init irqstack_early_init(void)
 202 {
 203         unsigned int i;
 204
 205         /* interrupt stacks must be in lowmem, we get that for free on ppc32
 206          * as the memblock is limited to lowmem by default */
 207         for_each_possible_cpu(i) {
 208                 softirq_ctx[i] = (struct thread_info *)
 209                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 210                 hardirq_ctx[i] = (struct thread_info *)
 211                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 212         }
 213 }
 214
 215 #if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
 216 void __init exc_lvl_early_init(void)
 217 {
 218         unsigned int i, hw_cpu;
 219
 220         /* interrupt stacks must be in lowmem, we get that for free on ppc32
 221          * as the memblock is limited to lowmem by MEMBLOCK_REAL_LIMIT */
 222         for_each_possible_cpu(i) {
 223 #ifdef CONFIG_SMP
 224                 hw_cpu = get_hard_smp_processor_id(i);
 225 #else
 226                 hw_cpu = 0;
 227 #endif
 228
 229                 critirq_ctx[hw_cpu] = (struct thread_info *)
 230                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 231 #ifdef CONFIG_BOOKE
 232                 dbgirq_ctx[hw_cpu] = (struct thread_info *)
 233                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 234                 mcheckirq_ctx[hw_cpu] = (struct thread_info *)
 235                         __va(memblock_alloc(THREAD_SIZE, THREAD_SIZE));
 236 #endif
 237         }
 238 }
 239 #endif
 240
 241 void __init setup_power_save(void)
 242 {
 243 #ifdef CONFIG_6xx
 244         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 245             cpu_has_feature(CPU_FTR_CAN_NAP))
 246                 ppc_md.power_save = ppc6xx_idle;
 247 #endif
 248
 249 #ifdef CONFIG_E500
 250         if (cpu_has_feature(CPU_FTR_CAN_DOZE) ||
 251             cpu_has_feature(CPU_FTR_CAN_NAP))
 252                 ppc_md.power_save = e500_idle;
 253 #endif
 254 }
 255
 256 __init void initialize_cache_info(void)
 257 {
 258         /*
 259          * Set cache line size based on type of cpu as a default.
 260          * Systems with OF can look in the properties on the cpu node(s)
 261          * for a possibly more accurate value.
 262          */
 263         dcache_bsize = cur_cpu_spec->dcache_bsize;
 264         icache_bsize = cur_cpu_spec->icache_bsize;
 265         ucache_bsize = 0;
 266         if (cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE))
 267                 ucache_bsize = icache_bsize = dcache_bsize;
 268 }