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setup.c

/*
 * Common prep boot and setup code.
 */

#include <linux/module.h>
#include <linux/string.h>
#include <linux/sched.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/reboot.h>
#include <linux/delay.h>
#include <linux/initrd.h>
#include <linux/ide.h>
#include <linux/screen_info.h>
#include <linux/bootmem.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/cpu.h>
#include <linux/console.h>

#include <asm/residual.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/processor.h>
#include <asm/pgtable.h>
#include <asm/bootinfo.h>
#include <asm/setup.h>
#include <asm/smp.h>
#include <asm/elf.h>
#include <asm/cputable.h>
#include <asm/bootx.h>
#include <asm/btext.h>
#include <asm/machdep.h>
#include <asm/uaccess.h>
#include <asm/system.h>
#include <asm/sections.h>
#include <asm/nvram.h>
#include <asm/xmon.h>
#include <asm/ocp.h>
#include <asm/prom.h>

#define USES_PPC_SYS (defined(CONFIG_85xx) || defined(CONFIG_83xx) || \
                  defined(CONFIG_MPC10X_BRIDGE) || defined(CONFIG_8260) || \
                  defined(CONFIG_PPC_MPC52xx))

#if USES_PPC_SYS
#include <asm/ppc_sys.h>
#endif

#if defined CONFIG_KGDB
#include <asm/kgdb.h>
#endif

extern void platform_init(unsigned long r3, unsigned long r4,
            unsigned long r5, unsigned long r6, unsigned long r7);
extern void reloc_got2(unsigned long offset);

extern void ppc6xx_idle(void);
extern void power4_idle(void);

extern boot_infos_t *boot_infos;
struct ide_machdep_calls ppc_ide_md;

/* Used with the BI_MEMSIZE bootinfo parameter to store the memory
   size value reported by the boot loader. */
unsigned long boot_mem_size;

unsigned long ISA_DMA_THRESHOLD;
unsigned int DMA_MODE_READ;
unsigned int DMA_MODE_WRITE;

#ifdef CONFIG_PPC_PREP
extern void prep_init(unsigned long r3, unsigned long r4,
            unsigned long r5, unsigned long r6, unsigned long r7);

dev_t boot_dev;
#endif /* CONFIG_PPC_PREP */

int have_of;
EXPORT_SYMBOL(have_of);

#ifdef __DO_IRQ_CANON
int ppc_do_canonicalize_irqs;
EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
#endif

#ifdef CONFIG_VGA_CONSOLE
unsigned long vgacon_remap_base;
#endif

struct machdep_calls ppc_md;

/*
 * These are used in binfmt_elf.c to put aux entries on the stack
 * for each elf executable being started.
 */
int dcache_bsize;
int icache_bsize;
int ucache_bsize;

#if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) || \
    defined(CONFIG_FB_VGA16_MODULE) || defined(CONFIG_FB_VESA)
struct screen_info screen_info = {
      0, 25,                  /* orig-x, orig-y */
      0,                /* unused */
      0,                /* orig-video-page */
      0,                /* orig-video-mode */
      80,               /* orig-video-cols */
      0,0,0,                  /* ega_ax, ega_bx, ega_cx */
      25,               /* orig-video-lines */
      1,                /* orig-video-isVGA */
      16                /* orig-video-points */
};
#endif /* CONFIG_VGA_CONSOLE || CONFIG_FB_VGA16 || CONFIG_FB_VESA */

void machine_restart(char *cmd)
{
#ifdef CONFIG_NVRAM
      nvram_sync();
#endif
      ppc_md.restart(cmd);
}

static void ppc_generic_power_off(void)
{
      ppc_md.power_off();
}

void machine_halt(void)
{
#ifdef CONFIG_NVRAM
      nvram_sync();
#endif
      ppc_md.halt();
}

void (*pm_power_off)(void) = ppc_generic_power_off;

void machine_power_off(void)
{
#ifdef CONFIG_NVRAM
      nvram_sync();
#endif
      if (pm_power_off)
            pm_power_off();
      ppc_generic_power_off();
}

#ifdef CONFIG_TAU
extern u32 cpu_temp(unsigned long cpu);
extern u32 cpu_temp_both(unsigned long cpu);
#endif /* CONFIG_TAU */

int show_cpuinfo(struct seq_file *m, void *v)
{
      int i = (int) v - 1;
      int err = 0;
      unsigned int pvr;
      unsigned short maj, min;
      unsigned long lpj;

      if (i >= NR_CPUS) {
            /* Show summary information */
#ifdef CONFIG_SMP
            unsigned long bogosum = 0;
            for_each_online_cpu(i)
                  bogosum += cpu_data[i].loops_per_jiffy;
            seq_printf(m, "total bogomips\t: %lu.%02lu\n",
                     bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
#endif /* CONFIG_SMP */

            if (ppc_md.show_cpuinfo != NULL)
                  err = ppc_md.show_cpuinfo(m);
            return err;
      }

#ifdef CONFIG_SMP
      if (!cpu_online(i))
            return 0;
      pvr = cpu_data[i].pvr;
      lpj = cpu_data[i].loops_per_jiffy;
#else
      pvr = mfspr(SPRN_PVR);
      lpj = loops_per_jiffy;
#endif

      seq_printf(m, "processor\t: %d\n", i);
      seq_printf(m, "cpu\t\t: ");

      if (cur_cpu_spec->pvr_mask)
            seq_printf(m, "%s", cur_cpu_spec->cpu_name);
      else
            seq_printf(m, "unknown (%08x)", pvr);
#ifdef CONFIG_ALTIVEC
      if (cur_cpu_spec->cpu_features & CPU_FTR_ALTIVEC)
            seq_printf(m, ", altivec supported");
#endif
      seq_printf(m, "\n");

#ifdef CONFIG_TAU
      if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
#ifdef CONFIG_TAU_AVERAGE
            /* more straightforward, but potentially misleading */
            seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
                     cpu_temp(i));
#else
            /* show the actual temp sensor range */
            u32 temp;
            temp = cpu_temp_both(i);
            seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
                     temp & 0xff, temp >> 16);
#endif
      }
#endif /* CONFIG_TAU */

      if (ppc_md.show_percpuinfo != NULL) {
            err = ppc_md.show_percpuinfo(m, i);
            if (err)
                  return err;
      }

      /* If we are a Freescale core do a simple check so
       * we dont have to keep adding cases in the future */
      if ((PVR_VER(pvr) & 0x8000) == 0x8000) {
            maj = PVR_MAJ(pvr);
            min = PVR_MIN(pvr);
      } else {
            switch (PVR_VER(pvr)) {
                  case 0x0020:      /* 403 family */
                        maj = PVR_MAJ(pvr) + 1;
                        min = PVR_MIN(pvr);
                        break;
                  case 0x1008:      /* 740P/750P ?? */
                        maj = ((pvr >> 8) & 0xFF) - 1;
                        min = pvr & 0xFF;
                        break;
                  default:
                        maj = (pvr >> 8) & 0xFF;
                        min = pvr & 0xFF;
                        break;
            }
      }

      seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
               maj, min, PVR_VER(pvr), PVR_REV(pvr));

      seq_printf(m, "bogomips\t: %lu.%02lu\n",
               lpj / (500000/HZ), (lpj / (5000/HZ)) % 100);

#if USES_PPC_SYS
      if (cur_ppc_sys_spec->ppc_sys_name)
            seq_printf(m, "chipset\t\t: %s\n",
                  cur_ppc_sys_spec->ppc_sys_name);
#endif

#ifdef CONFIG_SMP
      seq_printf(m, "\n");
#endif

      return 0;
}

static void *c_start(struct seq_file *m, loff_t *pos)
{
      int i = *pos;

      return i <= NR_CPUS? (void *) (i + 1): NULL;
}

static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
      ++*pos;
      return c_start(m, pos);
}

static void c_stop(struct seq_file *m, void *v)
{
}

struct seq_operations cpuinfo_op = {
      .start =c_start,
      .next =     c_next,
      .stop =     c_stop,
      .show =     show_cpuinfo,
};

/*
 * We're called here very early in the boot.  We determine the machine
 * type and call the appropriate low-level setup functions.
 *  -- Cort <cort@fsmlabs.com>
 *
 * Note that the kernel may be running at an address which is different
 * from the address that it was linked at, so we must use RELOC/PTRRELOC
 * to access static data (including strings).  -- paulus
 */
__init
unsigned long
early_init(int r3, int r4, int r5)
{
      unsigned long phys;
      unsigned long offset = reloc_offset();
      struct cpu_spec *spec;

      /* Default */
      phys = offset + KERNELBASE;

      /* First zero the BSS -- use memset, some arches don't have
       * caches on yet */
      memset_io(PTRRELOC(&__bss_start), 0, _end - __bss_start);

      /*
       * Identify the CPU type and fix up code sections
       * that depend on which cpu we have.
       */
#if defined(CONFIG_440EP) && defined(CONFIG_PPC_FPU)
      /* We pass the virtual PVR here for 440EP as 440EP and 440GR have
       * identical PVRs and there is no reliable way to check for the FPU
       */
      spec = identify_cpu(offset, (mfspr(SPRN_PVR) | 0x8));
#else
      spec = identify_cpu(offset, mfspr(SPRN_PVR));
#endif
      do_feature_fixups(spec->cpu_features,
                    PTRRELOC(&__start___ftr_fixup),
                    PTRRELOC(&__stop___ftr_fixup));

      return phys;
}

#ifdef CONFIG_PPC_PREP
/*
 * The PPC_PREP version of platform_init...
 */
void __init
platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
            unsigned long r6, unsigned long r7)
{
#ifdef CONFIG_BOOTX_TEXT
      if (boot_text_mapped) {
            btext_clearscreen();
            btext_welcome();
      }
#endif

      parse_bootinfo(find_bootinfo());

      prep_init(r3, r4, r5, r6, r7);
}
#endif /* CONFIG_PPC_PREP */

struct bi_record *find_bootinfo(void)
{
      struct bi_record *rec;

      rec = (struct bi_record *)_ALIGN((ulong)__bss_start+(1<<20)-1,(1<<20));
      if ( rec->tag != BI_FIRST ) {
            /*
             * This 0x10000 offset is a terrible hack but it will go away when
             * we have the bootloader handle all the relocation and
             * prom calls -- Cort
             */
            rec = (struct bi_record *)_ALIGN((ulong)__bss_start+0x10000+(1<<20)-1,(1<<20));
            if ( rec->tag != BI_FIRST )
                  return NULL;
      }
      return rec;
}

void parse_bootinfo(struct bi_record *rec)
{
      if (rec == NULL || rec->tag != BI_FIRST)
            return;
      while (rec->tag != BI_LAST) {
            ulong *data = rec->data;
            switch (rec->tag) {
            case BI_CMD_LINE:
                  strlcpy(cmd_line, (void *)data, sizeof(cmd_line));
                  break;
#ifdef CONFIG_BLK_DEV_INITRD
            case BI_INITRD:
                  initrd_start = data[0] + KERNELBASE;
                  initrd_end = data[0] + data[1] + KERNELBASE;
                  break;
#endif /* CONFIG_BLK_DEV_INITRD */
            case BI_MEMSIZE:
                  boot_mem_size = data[0];
                  break;
            }
            rec = (struct bi_record *)((ulong)rec + rec->size);
      }
}

/*
 * Find out what kind of machine we're on and save any data we need
 * from the early boot process (devtree is copied on pmac by prom_init()).
 * This is called very early on the boot process, after a minimal
 * MMU environment has been set up but before MMU_init is called.
 */
void __init
machine_init(unsigned long r3, unsigned long r4, unsigned long r5,
           unsigned long r6, unsigned long r7)
{
#ifdef CONFIG_CMDLINE
      strlcpy(cmd_line, CONFIG_CMDLINE, sizeof(cmd_line));
#endif /* CONFIG_CMDLINE */

#ifdef CONFIG_6xx
      ppc_md.power_save = ppc6xx_idle;
#endif

      platform_init(r3, r4, r5, r6, r7);

      if (ppc_md.progress)
            ppc_md.progress("id mach(): done", 0x200);
}
#ifdef CONFIG_BOOKE_WDT
/* Checks wdt=x and wdt_period=xx command-line option */
int __init early_parse_wdt(char *p)
{
      if (p && strncmp(p, "0", 1) != 0)
             booke_wdt_enabled = 1;

      return 0;
}
early_param("wdt", early_parse_wdt);

int __init early_parse_wdt_period (char *p)
{
      if (p)
            booke_wdt_period = simple_strtoul(p, NULL, 0);

      return 0;
}
early_param("wdt_period", early_parse_wdt_period);
#endif      /* CONFIG_BOOKE_WDT */

/* Checks "l2cr=xxxx" command-line option */
int __init ppc_setup_l2cr(char *str)
{
      if (cpu_has_feature(CPU_FTR_L2CR)) {
            unsigned long val = simple_strtoul(str, NULL, 0);
            printk(KERN_INFO "l2cr set to %lx\n", val);
            _set_L2CR(0);           /* force invalidate by disable cache */
            _set_L2CR(val);         /* and enable it */
      }
      return 1;
}
__setup("l2cr=", ppc_setup_l2cr);

#ifdef CONFIG_GENERIC_NVRAM

/* Generic nvram hooks used by drivers/char/gen_nvram.c */
unsigned char nvram_read_byte(int addr)
{
      if (ppc_md.nvram_read_val)
            return ppc_md.nvram_read_val(addr);
      return 0xff;
}
EXPORT_SYMBOL(nvram_read_byte);

void nvram_write_byte(unsigned char val, int addr)
{
      if (ppc_md.nvram_write_val)
            ppc_md.nvram_write_val(addr, val);
}
EXPORT_SYMBOL(nvram_write_byte);

void nvram_sync(void)
{
      if (ppc_md.nvram_sync)
            ppc_md.nvram_sync();
}
EXPORT_SYMBOL(nvram_sync);

#endif /* CONFIG_NVRAM */

static struct cpu cpu_devices[NR_CPUS];

int __init ppc_init(void)
{
      int i;

      /* clear the progress line */
      if ( ppc_md.progress ) ppc_md.progress("             ", 0xffff);

      /* register CPU devices */
      for_each_possible_cpu(i)
            register_cpu(&cpu_devices[i], i);

      /* call platform init */
      if (ppc_md.init != NULL) {
            ppc_md.init();
      }
      return 0;
}

arch_initcall(ppc_init);

/* Warning, IO base is not yet inited */
void __init setup_arch(char **cmdline_p)
{
      extern char *klimit;
      extern void do_init_bootmem(void);

      /* so udelay does something sensible, assume <= 1000 bogomips */
      loops_per_jiffy = 500000000 / HZ;

      if (ppc_md.init_early)
            ppc_md.init_early();

#ifdef CONFIG_XMON
      xmon_init(1);
      if (strstr(cmd_line, "xmon"))
            xmon(NULL);
#endif /* CONFIG_XMON */
      if ( ppc_md.progress ) ppc_md.progress("setup_arch: enter", 0x3eab);

#if defined(CONFIG_KGDB)
      if (ppc_md.kgdb_map_scc)
            ppc_md.kgdb_map_scc();
      set_debug_traps();
      if (strstr(cmd_line, "gdb")) {
            if (ppc_md.progress)
                  ppc_md.progress("setup_arch: kgdb breakpoint", 0x4000);
            printk("kgdb breakpoint activated\n");
            breakpoint();
      }
#endif

      /*
       * Set cache line size based on type of cpu as a default.
       * Systems with OF can look in the properties on the cpu node(s)
       * for a possibly more accurate value.
       */
      if (! cpu_has_feature(CPU_FTR_UNIFIED_ID_CACHE)) {
            dcache_bsize = cur_cpu_spec->dcache_bsize;
            icache_bsize = cur_cpu_spec->icache_bsize;
            ucache_bsize = 0;
      } else
            ucache_bsize = dcache_bsize = icache_bsize
                  = cur_cpu_spec->dcache_bsize;

      /* reboot on panic */
      panic_timeout = 180;

      init_mm.start_code = PAGE_OFFSET;
      init_mm.end_code = (unsigned long) _etext;
      init_mm.end_data = (unsigned long) _edata;
      init_mm.brk = (unsigned long) klimit;

      /* Save unparsed command line copy for /proc/cmdline */
      strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
      *cmdline_p = cmd_line;

      parse_early_param();

      /* set up the bootmem stuff with available memory */
      do_init_bootmem();
      if ( ppc_md.progress ) ppc_md.progress("setup_arch: bootmem", 0x3eab);

#ifdef CONFIG_PPC_OCP
      /* Initialize OCP device list */
      ocp_early_init();
      if ( ppc_md.progress ) ppc_md.progress("ocp: exit", 0x3eab);
#endif

#ifdef CONFIG_DUMMY_CONSOLE
      conswitchp = &dummy_con;
#endif

      ppc_md.setup_arch();
      if ( ppc_md.progress ) ppc_md.progress("arch: exit", 0x3eab);

      paging_init();
}

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