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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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b8e383d592
On a number of embedded reference boards there isn't always a way to reset, power_off, or halt the board. Rather than having each board implement a spin loop just let the generic code do it. Signed-off-by: Kumar Gala <galak@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
471 lines
11 KiB
C
471 lines
11 KiB
C
/*
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* Common boot and setup code for both 32-bit and 64-bit.
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* Extracted from arch/powerpc/kernel/setup_64.c.
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*
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* Copyright (C) 2001 PPC64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/sched.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/reboot.h>
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#include <linux/delay.h>
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#include <linux/initrd.h>
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#include <linux/ide.h>
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#include <linux/seq_file.h>
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#include <linux/ioport.h>
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#include <linux/console.h>
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#include <linux/utsname.h>
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#include <linux/tty.h>
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#include <linux/root_dev.h>
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#include <linux/notifier.h>
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#include <linux/cpu.h>
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#include <linux/unistd.h>
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#include <linux/serial.h>
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#include <linux/serial_8250.h>
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#include <asm/io.h>
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#include <asm/prom.h>
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#include <asm/processor.h>
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#include <asm/vdso_datapage.h>
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#include <asm/pgtable.h>
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#include <asm/smp.h>
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#include <asm/elf.h>
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#include <asm/machdep.h>
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#include <asm/time.h>
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#include <asm/cputable.h>
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#include <asm/sections.h>
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#include <asm/btext.h>
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#include <asm/nvram.h>
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#include <asm/setup.h>
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#include <asm/system.h>
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#include <asm/rtas.h>
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#include <asm/iommu.h>
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#include <asm/serial.h>
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#include <asm/cache.h>
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#include <asm/page.h>
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#include <asm/mmu.h>
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#include <asm/lmb.h>
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#include <asm/xmon.h>
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#include "setup.h"
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#undef DEBUG
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#ifdef DEBUG
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#include <asm/udbg.h>
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#define DBG(fmt...) udbg_printf(fmt)
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#else
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#define DBG(fmt...)
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#endif
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#ifdef CONFIG_PPC_MULTIPLATFORM
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int _machine = 0;
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EXPORT_SYMBOL(_machine);
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#endif
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unsigned long klimit = (unsigned long) _end;
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/*
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* This still seems to be needed... -- paulus
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*/
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struct screen_info screen_info = {
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.orig_x = 0,
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.orig_y = 25,
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.orig_video_cols = 80,
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.orig_video_lines = 25,
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.orig_video_isVGA = 1,
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.orig_video_points = 16
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};
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#ifdef __DO_IRQ_CANON
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/* XXX should go elsewhere eventually */
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int ppc_do_canonicalize_irqs;
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EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
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#endif
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/* also used by kexec */
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void machine_shutdown(void)
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{
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if (ppc_md.machine_shutdown)
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ppc_md.machine_shutdown();
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}
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void machine_restart(char *cmd)
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{
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machine_shutdown();
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if (ppc_md.restart)
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ppc_md.restart(cmd);
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#ifdef CONFIG_SMP
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smp_send_stop();
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#endif
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printk(KERN_EMERG "System Halted, OK to turn off power\n");
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local_irq_disable();
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while (1) ;
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}
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void machine_power_off(void)
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{
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machine_shutdown();
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if (ppc_md.power_off)
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ppc_md.power_off();
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#ifdef CONFIG_SMP
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smp_send_stop();
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#endif
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printk(KERN_EMERG "System Halted, OK to turn off power\n");
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local_irq_disable();
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while (1) ;
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}
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/* Used by the G5 thermal driver */
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EXPORT_SYMBOL_GPL(machine_power_off);
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void (*pm_power_off)(void) = machine_power_off;
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EXPORT_SYMBOL_GPL(pm_power_off);
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void machine_halt(void)
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{
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machine_shutdown();
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if (ppc_md.halt)
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ppc_md.halt();
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#ifdef CONFIG_SMP
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smp_send_stop();
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#endif
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printk(KERN_EMERG "System Halted, OK to turn off power\n");
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local_irq_disable();
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while (1) ;
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}
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#ifdef CONFIG_TAU
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extern u32 cpu_temp(unsigned long cpu);
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extern u32 cpu_temp_both(unsigned long cpu);
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#endif /* CONFIG_TAU */
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#ifdef CONFIG_SMP
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DEFINE_PER_CPU(unsigned int, pvr);
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#endif
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static int show_cpuinfo(struct seq_file *m, void *v)
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{
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unsigned long cpu_id = (unsigned long)v - 1;
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unsigned int pvr;
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unsigned short maj;
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unsigned short min;
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if (cpu_id == NR_CPUS) {
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#if defined(CONFIG_SMP) && defined(CONFIG_PPC32)
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unsigned long bogosum = 0;
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int i;
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for (i = 0; i < NR_CPUS; ++i)
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if (cpu_online(i))
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bogosum += loops_per_jiffy;
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seq_printf(m, "total bogomips\t: %lu.%02lu\n",
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bogosum/(500000/HZ), bogosum/(5000/HZ) % 100);
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#endif /* CONFIG_SMP && CONFIG_PPC32 */
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seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
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if (ppc_md.show_cpuinfo != NULL)
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ppc_md.show_cpuinfo(m);
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return 0;
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}
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/* We only show online cpus: disable preempt (overzealous, I
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* knew) to prevent cpu going down. */
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preempt_disable();
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if (!cpu_online(cpu_id)) {
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preempt_enable();
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return 0;
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}
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#ifdef CONFIG_SMP
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pvr = per_cpu(pvr, cpu_id);
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#else
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pvr = mfspr(SPRN_PVR);
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#endif
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maj = (pvr >> 8) & 0xFF;
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min = pvr & 0xFF;
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seq_printf(m, "processor\t: %lu\n", cpu_id);
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seq_printf(m, "cpu\t\t: ");
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if (cur_cpu_spec->pvr_mask)
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seq_printf(m, "%s", cur_cpu_spec->cpu_name);
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else
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seq_printf(m, "unknown (%08x)", pvr);
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#ifdef CONFIG_ALTIVEC
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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seq_printf(m, ", altivec supported");
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#endif /* CONFIG_ALTIVEC */
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seq_printf(m, "\n");
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#ifdef CONFIG_TAU
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if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) {
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#ifdef CONFIG_TAU_AVERAGE
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/* more straightforward, but potentially misleading */
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seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
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cpu_temp(cpu_id));
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#else
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/* show the actual temp sensor range */
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u32 temp;
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temp = cpu_temp_both(cpu_id);
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seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
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temp & 0xff, temp >> 16);
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#endif
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}
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#endif /* CONFIG_TAU */
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/*
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* Assume here that all clock rates are the same in a
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* smp system. -- Cort
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*/
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if (ppc_proc_freq)
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seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
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ppc_proc_freq / 1000000, ppc_proc_freq % 1000000);
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if (ppc_md.show_percpuinfo != NULL)
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ppc_md.show_percpuinfo(m, cpu_id);
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/* If we are a Freescale core do a simple check so
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* we dont have to keep adding cases in the future */
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if (PVR_VER(pvr) & 0x8000) {
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maj = PVR_MAJ(pvr);
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min = PVR_MIN(pvr);
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} else {
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switch (PVR_VER(pvr)) {
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case 0x0020: /* 403 family */
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maj = PVR_MAJ(pvr) + 1;
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min = PVR_MIN(pvr);
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break;
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case 0x1008: /* 740P/750P ?? */
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maj = ((pvr >> 8) & 0xFF) - 1;
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min = pvr & 0xFF;
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break;
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default:
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maj = (pvr >> 8) & 0xFF;
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min = pvr & 0xFF;
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break;
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}
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}
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seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
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maj, min, PVR_VER(pvr), PVR_REV(pvr));
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#ifdef CONFIG_PPC32
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seq_printf(m, "bogomips\t: %lu.%02lu\n",
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loops_per_jiffy / (500000/HZ),
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(loops_per_jiffy / (5000/HZ)) % 100);
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#endif
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#ifdef CONFIG_SMP
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seq_printf(m, "\n");
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#endif
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preempt_enable();
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return 0;
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}
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static void *c_start(struct seq_file *m, loff_t *pos)
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{
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unsigned long i = *pos;
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return i <= NR_CPUS ? (void *)(i + 1) : NULL;
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}
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static void *c_next(struct seq_file *m, void *v, loff_t *pos)
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{
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++*pos;
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return c_start(m, pos);
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}
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static void c_stop(struct seq_file *m, void *v)
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{
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}
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struct seq_operations cpuinfo_op = {
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.start =c_start,
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.next = c_next,
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.stop = c_stop,
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.show = show_cpuinfo,
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};
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void __init check_for_initrd(void)
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{
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#ifdef CONFIG_BLK_DEV_INITRD
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unsigned long *prop;
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DBG(" -> check_for_initrd()\n");
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if (of_chosen) {
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prop = (unsigned long *)get_property(of_chosen,
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"linux,initrd-start", NULL);
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if (prop != NULL) {
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initrd_start = (unsigned long)__va(*prop);
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prop = (unsigned long *)get_property(of_chosen,
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"linux,initrd-end", NULL);
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if (prop != NULL) {
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initrd_end = (unsigned long)__va(*prop);
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initrd_below_start_ok = 1;
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} else
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initrd_start = 0;
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}
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}
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/* If we were passed an initrd, set the ROOT_DEV properly if the values
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* look sensible. If not, clear initrd reference.
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*/
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if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
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initrd_end > initrd_start)
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ROOT_DEV = Root_RAM0;
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else
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initrd_start = initrd_end = 0;
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if (initrd_start)
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printk("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
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DBG(" <- check_for_initrd()\n");
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#endif /* CONFIG_BLK_DEV_INITRD */
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}
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#ifdef CONFIG_SMP
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/**
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* setup_cpu_maps - initialize the following cpu maps:
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* cpu_possible_map
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* cpu_present_map
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* cpu_sibling_map
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*
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* Having the possible map set up early allows us to restrict allocations
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* of things like irqstacks to num_possible_cpus() rather than NR_CPUS.
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*
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* We do not initialize the online map here; cpus set their own bits in
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* cpu_online_map as they come up.
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*
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* This function is valid only for Open Firmware systems. finish_device_tree
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* must be called before using this.
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*
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* While we're here, we may as well set the "physical" cpu ids in the paca.
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*/
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void __init smp_setup_cpu_maps(void)
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{
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struct device_node *dn = NULL;
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int cpu = 0;
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int swap_cpuid = 0;
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while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < NR_CPUS) {
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int *intserv;
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int j, len = sizeof(u32), nthreads = 1;
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intserv = (int *)get_property(dn, "ibm,ppc-interrupt-server#s",
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&len);
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if (intserv)
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nthreads = len / sizeof(int);
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else {
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intserv = (int *) get_property(dn, "reg", NULL);
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if (!intserv)
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intserv = &cpu; /* assume logical == phys */
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}
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for (j = 0; j < nthreads && cpu < NR_CPUS; j++) {
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cpu_set(cpu, cpu_present_map);
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set_hard_smp_processor_id(cpu, intserv[j]);
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if (intserv[j] == boot_cpuid_phys)
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swap_cpuid = cpu;
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cpu_set(cpu, cpu_possible_map);
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cpu++;
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}
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}
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/* Swap CPU id 0 with boot_cpuid_phys, so we can always assume that
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* boot cpu is logical 0.
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*/
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if (boot_cpuid_phys != get_hard_smp_processor_id(0)) {
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u32 tmp;
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tmp = get_hard_smp_processor_id(0);
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set_hard_smp_processor_id(0, boot_cpuid_phys);
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set_hard_smp_processor_id(swap_cpuid, tmp);
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}
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#ifdef CONFIG_PPC64
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/*
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* On pSeries LPAR, we need to know how many cpus
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* could possibly be added to this partition.
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*/
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if (_machine == PLATFORM_PSERIES_LPAR &&
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(dn = of_find_node_by_path("/rtas"))) {
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int num_addr_cell, num_size_cell, maxcpus;
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unsigned int *ireg;
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num_addr_cell = prom_n_addr_cells(dn);
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num_size_cell = prom_n_size_cells(dn);
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ireg = (unsigned int *)
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get_property(dn, "ibm,lrdr-capacity", NULL);
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if (!ireg)
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goto out;
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maxcpus = ireg[num_addr_cell + num_size_cell];
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/* Double maxcpus for processors which have SMT capability */
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if (cpu_has_feature(CPU_FTR_SMT))
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maxcpus *= 2;
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if (maxcpus > NR_CPUS) {
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printk(KERN_WARNING
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"Partition configured for %d cpus, "
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"operating system maximum is %d.\n",
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maxcpus, NR_CPUS);
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maxcpus = NR_CPUS;
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} else
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printk(KERN_INFO "Partition configured for %d cpus.\n",
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maxcpus);
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for (cpu = 0; cpu < maxcpus; cpu++)
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cpu_set(cpu, cpu_possible_map);
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out:
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of_node_put(dn);
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}
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/*
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* Do the sibling map; assume only two threads per processor.
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*/
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for_each_cpu(cpu) {
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cpu_set(cpu, cpu_sibling_map[cpu]);
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if (cpu_has_feature(CPU_FTR_SMT))
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cpu_set(cpu ^ 0x1, cpu_sibling_map[cpu]);
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}
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vdso_data->processorCount = num_present_cpus();
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#endif /* CONFIG_PPC64 */
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}
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#endif /* CONFIG_SMP */
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#ifdef CONFIG_XMON
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static int __init early_xmon(char *p)
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{
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/* ensure xmon is enabled */
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if (p) {
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if (strncmp(p, "on", 2) == 0)
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xmon_init(1);
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if (strncmp(p, "off", 3) == 0)
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xmon_init(0);
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if (strncmp(p, "early", 5) != 0)
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return 0;
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}
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xmon_init(1);
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debugger(NULL);
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return 0;
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}
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early_param("xmon", early_xmon);
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#endif
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