setup.c

linux内核源码

/*
 *  Powermac setup and early boot code plus other random bits.
 *
 *  PowerPC version
 *    Copyright (C) 1995-1996 Gary Thomas ([e-mail])
 *
 *  Adapted for Power Macintosh by Paul Mackerras
 *    Copyright (C) 1996 Paul Mackerras ([e-mail])
 *
 *  Derived from "arch/alpha/kernel/setup.c"
 *    Copyright (C) 1995 Linus Torvalds
 *
 *  Maintained by Benjamin Herrenschmidt ([e-mail])
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

/*
 * bootup setup stuff..
 */

#include <linux/init.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/stddef.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/user.h>
#include <linux/a.out.h>
#include <linux/tty.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/major.h>
#include <linux/initrd.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <linux/pci.h>
#include <linux/adb.h>
#include <linux/cuda.h>
#include <linux/pmu.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/bitops.h>
#include <linux/suspend.h>

#include <asm/reg.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/io.h>
#include <asm/kexec.h>
#include <asm/pci-bridge.h>
#include <asm/ohare.h>
#include <asm/mediabay.h>
#include <asm/machdep.h>
#include <asm/dma.h>
#include <asm/cputable.h>
#include <asm/btext.h>
#include <asm/pmac_feature.h>
#include <asm/time.h>
#include <asm/of_device.h>
#include <asm/of_platform.h>
#include <asm/mmu_context.h>
#include <asm/iommu.h>
#include <asm/smu.h>
#include <asm/pmc.h>
#include <asm/lmb.h>
#include <asm/udbg.h>

#include "pmac.h"

#undef SHOW_GATWICK_IRQS

int ppc_override_l2cr = 0;
int ppc_override_l2cr_value;
int has_l2cache = 0;

int pmac_newworld;

static int current_root_goodness = -1;

extern struct machdep_calls pmac_md;

#define DEFAULT_ROOT_DEVICE Root_SDA1	/* sda1 - slightly silly choice */

#ifdef CONFIG_PPC64
#include <asm/udbg.h>
int sccdbg;
#endif

extern void zs_kgdb_hook(int tty_num);

sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;
EXPORT_SYMBOL(sys_ctrler);

#ifdef CONFIG_PMAC_SMU
unsigned long smu_cmdbuf_abs;
EXPORT_SYMBOL(smu_cmdbuf_abs);
#endif

#ifdef CONFIG_SMP
extern struct smp_ops_t psurge_smp_ops;
extern struct smp_ops_t core99_smp_ops;
#endif /* CONFIG_SMP */

static void pmac_show_cpuinfo(struct seq_file *m)
{
	struct device_node *np;
	const char *pp;
	int plen;
	int mbmodel;
	unsigned int mbflags;
	char* mbname;

	mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
				    PMAC_MB_INFO_MODEL, 0);
	mbflags = pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL,
				    PMAC_MB_INFO_FLAGS, 0);
	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME,
			      (long) &mbname) != 0)
		mbname = "Unknown";

	/* find motherboard type */
	seq_printf(m, "machine\t\t: ");
	np = of_find_node_by_path("/");
	if (np != NULL) {
		pp = of_get_property(np, "model", NULL);
		if (pp != NULL)
			seq_printf(m, "%s\n", pp);
		else
			seq_printf(m, "PowerMac\n");
		pp = of_get_property(np, "compatible", &plen);
		if (pp != NULL) {
			seq_printf(m, "motherboard\t:");
			while (plen > 0) {
				int l = strlen(pp) + 1;
				seq_printf(m, " %s", pp);
				plen -= l;
				pp += l;
			}
			seq_printf(m, "\n");
		}
		of_node_put(np);
	} else
		seq_printf(m, "PowerMac\n");

	/* print parsed model */
	seq_printf(m, "detected as\t: %d (%s)\n", mbmodel, mbname);
	seq_printf(m, "pmac flags\t: %08x\n", mbflags);

	/* find l2 cache info */
	np = of_find_node_by_name(NULL, "l2-cache");
	if (np == NULL)
		np = of_find_node_by_type(NULL, "cache");
	if (np != NULL) {
		const unsigned int *ic =
			of_get_property(np, "i-cache-size", NULL);
		const unsigned int *dc =
			of_get_property(np, "d-cache-size", NULL);
		seq_printf(m, "L2 cache\t:");
		has_l2cache = 1;
		if (of_get_property(np, "cache-unified", NULL) != 0 && dc) {
			seq_printf(m, " %dK unified", *dc / 1024);
		} else {
			if (ic)
				seq_printf(m, " %dK instruction", *ic / 1024);
			if (dc)
				seq_printf(m, "%s %dK data",
					   (ic? " +": ""), *dc / 1024);
		}
		pp = of_get_property(np, "ram-type", NULL);
		if (pp)
			seq_printf(m, " %s", pp);
		seq_printf(m, "\n");
		of_node_put(np);
	}

	/* Indicate newworld/oldworld */
	seq_printf(m, "pmac-generation\t: %s\n",
		   pmac_newworld ? "NewWorld" : "OldWorld");
}

#ifndef CONFIG_ADB_CUDA
int find_via_cuda(void)
{
	struct device_node *dn = of_find_node_by_name(NULL, "via-cuda");

	if (!dn)
		return 0;
	of_node_put(dn);
	printk("WARNING ! Your machine is CUDA-based but your kernel\n");
	printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
	return 0;
}
#endif

#ifndef CONFIG_ADB_PMU
int find_via_pmu(void)
{
	struct device_node *dn = of_find_node_by_name(NULL, "via-pmu");

	if (!dn)
		return 0;
	of_node_put(dn);
	printk("WARNING ! Your machine is PMU-based but your kernel\n");
	printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
	return 0;
}
#endif

#ifndef CONFIG_PMAC_SMU
int smu_init(void)
{
	/* should check and warn if SMU is present */
	return 0;
}
#endif

#ifdef CONFIG_PPC32
static volatile u32 *sysctrl_regs;

static void __init ohare_init(void)
{
	struct device_node *dn;

	/* this area has the CPU identification register
	   and some registers used by smp boards */
	sysctrl_regs = (volatile u32 *) ioremap(0xf8000000, 0x1000);

	/*
	 * Turn on the L2 cache.
	 * We assume that we have a PSX memory controller iff
	 * we have an ohare I/O controller.
	 */
	dn = of_find_node_by_name(NULL, "ohare");
	if (dn) {
		of_node_put(dn);
		if (((sysctrl_regs[2] >> 24) & 0xf) >= 3) {
			if (sysctrl_regs[4] & 0x10)
				sysctrl_regs[4] |= 0x04000020;
			else
				sysctrl_regs[4] |= 0x04000000;
			if(has_l2cache)
				printk(KERN_INFO "Level 2 cache enabled\n");
		}
	}
}

static void __init l2cr_init(void)
{
	/* Checks "l2cr-value" property in the registry */
	if (cpu_has_feature(CPU_FTR_L2CR)) {
		struct device_node *np = of_find_node_by_name(NULL, "cpus");
		if (np == 0)
			np = of_find_node_by_type(NULL, "cpu");
		if (np != 0) {
			const unsigned int *l2cr =
				of_get_property(np, "l2cr-value", NULL);
			if (l2cr != 0) {
				ppc_override_l2cr = 1;
				ppc_override_l2cr_value = *l2cr;
				_set_L2CR(0);
				_set_L2CR(ppc_override_l2cr_value);
			}
			of_node_put(np);
		}
	}

	if (ppc_override_l2cr)
		printk(KERN_INFO "L2CR overridden (0x%x), "
		       "backside cache is %s\n",
		       ppc_override_l2cr_value,
		       (ppc_override_l2cr_value & 0x80000000)
				? "enabled" : "disabled");
}
#endif

static void __init pmac_setup_arch(void)
{
	struct device_node *cpu, *ic;
	const int *fp;
	unsigned long pvr;

	pvr = PVR_VER(mfspr(SPRN_PVR));

	/* Set loops_per_jiffy to a half-way reasonable value,
	   for use until calibrate_delay gets called. */
	loops_per_jiffy = 50000000 / HZ;
	cpu = of_find_node_by_type(NULL, "cpu");
	if (cpu != NULL) {
		fp = of_get_property(cpu, "clock-frequency", NULL);
		if (fp != NULL) {
			if (pvr >= 0x30 && pvr < 0x80)
				/* PPC970 etc. */
				loops_per_jiffy = *fp / (3 * HZ);
			else if (pvr == 4 || pvr >= 8)
				/* 604, G3, G4 etc. */
				loops_per_jiffy = *fp / HZ;
			else
				/* 601, 603, etc. */
				loops_per_jiffy = *fp / (2 * HZ);
		}
		of_node_put(cpu);
	}

	/* See if newworld or oldworld */
	for (ic = NULL; (ic = of_find_all_nodes(ic)) != NULL; )
		if (of_get_property(ic, "interrupt-controller", NULL))
			break;
	if (ic) {
		pmac_newworld = 1;
		of_node_put(ic);
	}

	/* Lookup PCI hosts */
	pmac_pci_init();

#ifdef CONFIG_PPC32
	ohare_init();
	l2cr_init();
#endif /* CONFIG_PPC32 */

#ifdef CONFIG_KGDB
	zs_kgdb_hook(0);
#endif

	find_via_cuda();
	find_via_pmu();
	smu_init();

#if defined(CONFIG_NVRAM) || defined(CONFIG_PPC64)
	pmac_nvram_init();
#endif

#ifdef CONFIG_PPC32
#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start)
		ROOT_DEV = Root_RAM0;
	else
#endif
		ROOT_DEV = DEFAULT_ROOT_DEVICE;
#endif

#ifdef CONFIG_SMP