pmac_setup.c

这个linux源代码是很全面的~基本完整了~使用c编译的~由于时间问题我没有亲自测试~但就算用来做参考资料也是非常好的

/*
 * BK Id: %F% %I% %G% %U% %#%
 */
/*
 *  arch/ppc/platforms/setup.c
 *
 *  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
 *
 *  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/config.h>
#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/blk.h>
#include <linux/vt_kern.h>
#include <linux/console.h>
#include <linux/ide.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/blkdev.h>
#include <linux/genhd.h>

#include <asm/processor.h>
#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/bitops.h>
#include <asm/io.h>
#include <asm/pci-bridge.h>
#include <asm/ohare.h>
#include <asm/mediabay.h>
#include <asm/machdep.h>
#include <asm/keyboard.h>
#include <asm/dma.h>
#include <asm/bootx.h>
#include <asm/cputable.h>
#include <asm/btext.h>
#include <asm/pmac_feature.h>
#include <asm/time.h>

#include "pmac_pic.h"
#include "mem_pieces.h"
#include "scsi.h" /* sd_find_target */
#include "sd.h"
#include "mac.h"

extern long pmac_time_init(void);
extern unsigned long pmac_get_rtc_time(void);
extern int pmac_set_rtc_time(unsigned long nowtime);
extern void pmac_read_rtc_time(void);
extern void pmac_calibrate_decr(void);
extern void pmac_pcibios_fixup(void);
extern void pmac_find_bridges(void);
extern int pmac_ide_check_base(ide_ioreg_t base);
extern ide_ioreg_t pmac_ide_get_base(int index);
extern void pmac_ide_init_hwif_ports(hw_regs_t *hw,
	ide_ioreg_t data_port, ide_ioreg_t ctrl_port, int *irq);

extern int mackbd_setkeycode(unsigned int scancode, unsigned int keycode);
extern int mackbd_getkeycode(unsigned int scancode);
extern int mackbd_translate(unsigned char keycode, unsigned char *keycodep,
		     char raw_mode);
extern char mackbd_unexpected_up(unsigned char keycode);
extern void mackbd_leds(unsigned char leds);
extern void __init mackbd_init_hw(void);
extern int mac_hid_kbd_translate(unsigned char scancode, unsigned char *keycode,
				 char raw_mode);
extern char mac_hid_kbd_unexpected_up(unsigned char keycode);
extern void mac_hid_init_hw(void);
extern unsigned char mac_hid_kbd_sysrq_xlate[];
extern unsigned char pckbd_sysrq_xlate[];
extern unsigned char mackbd_sysrq_xlate[];
extern int pckbd_setkeycode(unsigned int scancode, unsigned int keycode);
extern int pckbd_getkeycode(unsigned int scancode);
extern int pckbd_translate(unsigned char scancode, unsigned char *keycode,
			   char raw_mode);
extern char pckbd_unexpected_up(unsigned char keycode);
extern int keyboard_sends_linux_keycodes;
extern void pmac_nvram_update(void);

extern int pmac_pci_enable_device_hook(struct pci_dev *dev, int initial);
extern void pmac_pcibios_after_init(void);

struct device_node *memory_node;

unsigned char drive_info;

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

static int current_root_goodness = -1;

extern char saved_command_line[];

extern int pmac_newworld;

#define DEFAULT_ROOT_DEVICE 0x0801	/* sda1 - slightly silly choice */

extern void zs_kgdb_hook(int tty_num);
static void ohare_init(void);
#ifdef CONFIG_BOOTX_TEXT
void pmac_progress(char *s, unsigned short hex);
#endif

sys_ctrler_t sys_ctrler = SYS_CTRLER_UNKNOWN;

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

/*
 * Assume here that all clock rates are the same in a
 * smp system.  -- Cort
 */
int __openfirmware
of_show_percpuinfo(struct seq_file *m, int i)
{
	struct device_node *cpu_node;
	int *fp, s;
			
	cpu_node = find_type_devices("cpu");
	if (!cpu_node)
		return 0;
	for (s = 0; s < i && cpu_node->next; s++)
		cpu_node = cpu_node->next;
	fp = (int *) get_property(cpu_node, "clock-frequency", NULL);
	if (fp)
		seq_printf(m, "clock\t\t: %dMHz\n", *fp / 1000000);
	return 0;
}

int __pmac
pmac_show_cpuinfo(struct seq_file *m)
{
	struct device_node *np;
	char *pp;
	int plen;
	int mbmodel = pmac_call_feature(PMAC_FTR_GET_MB_INFO,
		NULL, PMAC_MB_INFO_MODEL, 0);
	unsigned int mbflags = (unsigned int)pmac_call_feature(PMAC_FTR_GET_MB_INFO,
		NULL, PMAC_MB_INFO_FLAGS, 0);
	char* mbname;

	if (pmac_call_feature(PMAC_FTR_GET_MB_INFO, NULL, PMAC_MB_INFO_NAME, (int)&mbname) != 0)
		mbname = "Unknown";
		
	/* find motherboard type */
	seq_printf(m, "machine\t\t: ");
	np = find_devices("device-tree");
	if (np != NULL) {
		pp = (char *) get_property(np, "model", NULL);
		if (pp != NULL)
			seq_printf(m, "%s\n", pp);
		else
			seq_printf(m, "PowerMac\n");
		pp = (char *) 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");
		}
	} 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 = find_devices("l2-cache");
	if (np == 0)
		np = find_type_devices("cache");
	if (np != 0) {
		unsigned int *ic = (unsigned int *)
			get_property(np, "i-cache-size", NULL);
		unsigned int *dc = (unsigned int *)
			get_property(np, "d-cache-size", NULL);
		seq_printf(m, "L2 cache\t:");
		has_l2cache = 1;
		if (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 = get_property(np, "ram-type", NULL);
		if (pp)
			seq_printf(m, " %s", pp);
		seq_printf(m, "\n");
	}

	/* find ram info */
	np = find_devices("memory");
	if (np != 0) {
		int n;
		struct reg_property *reg = (struct reg_property *)
			get_property(np, "reg", &n);
		
		if (reg != 0) {
			unsigned long total = 0;

			for (n /= sizeof(struct reg_property); n > 0; --n)
				total += (reg++)->size;
			seq_printf(m, "memory\t\t: %luMB\n", total >> 20);
		}
	}

	/* Checks "l2cr-value" property in the registry */
	np = find_devices("cpus");		
	if (np == 0)
		np = find_type_devices("cpu");		
	if (np != 0) {
		unsigned int *l2cr = (unsigned int *)
			get_property(np, "l2cr-value", NULL);
		if (l2cr != 0) {
			seq_printf(m, "l2cr override\t: 0x%x\n", *l2cr);
		}
	}
	
	/* Indicate newworld/oldworld */
	seq_printf(m, "pmac-generation\t: %s\n",
		   pmac_newworld ? "NewWorld" : "OldWorld");
	

	return 0;
}

#ifdef CONFIG_VT
/*
 * Dummy mksound function that does nothing.
 * The real one is in the dmasound driver.
 */
static void __pmac
pmac_mksound(unsigned int hz, unsigned int ticks)
{
}
#endif /* CONFIG_VT */

static volatile u32 *sysctrl_regs;

void __init
pmac_setup_arch(void)
{
	struct device_node *cpu;
	int *fp;
	unsigned long pvr;
	
	pvr = PVR_VER(mfspr(PVR));

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

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

	/* Lookup PCI hosts */
	pmac_find_bridges();
	
	/* Checks "l2cr-value" property in the registry */
	if (cur_cpu_spec[0]->cpu_features & CPU_FTR_L2CR) {
		struct device_node *np = find_devices("cpus");		
		if (np == 0)
			np = find_type_devices("cpu");		
		if (np != 0) {
			unsigned int *l2cr = (unsigned int *)
				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);
			}
		}
	}

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

#ifdef CONFIG_ADB_CUDA
	find_via_cuda();
#else
	if (find_devices("via-cuda")) {
		printk("WARNING ! Your machine is Cuda based but your kernel\n");
		printk("          wasn't compiled with CONFIG_ADB_CUDA option !\n");
	}
#endif	
#ifdef CONFIG_ADB_PMU
	find_via_pmu();
#else
	if (find_devices("via-pmu")) {
		printk("WARNING ! Your machine is PMU based but your kernel\n");
		printk("          wasn't compiled with CONFIG_ADB_PMU option !\n");
	}
#endif	
#ifdef CONFIG_NVRAM
	pmac_nvram_init();
#endif
#ifdef CONFIG_DUMMY_CONSOLE
	conswitchp = &dummy_con;
#endif
#ifdef CONFIG_VT
	kd_mksound = pmac_mksound;
#endif
#ifdef CONFIG_BLK_DEV_INITRD
	if (initrd_start)
		ROOT_DEV = MKDEV(RAMDISK_MAJOR, 0);
	else
#endif
		ROOT_DEV = to_kdev_t(DEFAULT_ROOT_DEVICE);

#ifdef CONFIG_SMP
	/* Check for Core99 */
	if (find_devices("uni-n"))
		ppc_md.smp_ops = &core99_smp_ops;
	else
		ppc_md.smp_ops = &psurge_smp_ops;
#endif /* CONFIG_SMP */

	pci_create_OF_bus_map();
}

static void __init ohare_init(void)
{
	/*
	 * Turn on the L2 cache.
	 * We assume that we have a PSX memory controller iff
	 * we have an ohare I/O controller.
	 */
	if (find_devices("ohare") != NULL) {
		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");
		}
	}
}

extern char *bootpath;
extern char *bootdevice;
void *boot_host;
int boot_target;
int boot_part;
extern kdev_t boot_dev;

void __init
pmac_init2(void)
{
#ifdef CONFIG_ADB_PMU
	via_pmu_start();
#endif
#ifdef CONFIG_ADB_CUDA
	via_cuda_start();
#endif
#ifdef CONFIG_PMAC_PBOOK
	media_bay_init();
#endif
	pmac_feature_late_init();
}

/* Borrowed from fs/partition/check.c */
static unsigned char* __init
read_one_block(struct block_device *bdev, unsigned long n, struct page **v)
{
	struct address_space *mapping = bdev->bd_inode->i_mapping;
	int sect = PAGE_CACHE_SIZE / 512;
	struct page *page;

	page = read_cache_page(mapping, n/sect,
			(filler_t *)mapping->a_ops->readpage, NULL);
	if (!IS_ERR(page)) {
		wait_on_page(page);
		if (!Page_Uptodate(page))
			goto fail;
		if (PageError(page))
			goto fail;
		*v = page;
		return (unsigned char *)page_address(page) + 512 * (n % sect);
fail:
		page_cache_release(page);
	}
	*v = NULL;
	return NULL;
}

#ifdef CONFIG_SCSI
void __init
note_scsi_host(struct device_node *node, void *host)
{
	int l;
	char *p;