pmac_setup.c

讲述linux的初始化过程

		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;
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	
}

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

	l = strlen(node->full_name);
	if (bootpath != NULL && bootdevice != NULL
	    && strncmp(node->full_name, bootdevice, l) == 0
	    && (bootdevice[l] == '/' || bootdevice[l] == 0)) {
		boot_host = host;
		/*
		 * There's a bug in OF 1.0.5.  (Why am I not surprised.)
		 * If you pass a path like scsi/sd@1:0 to canon, it returns
		 * something like /bandit@F2000000/gc@10/53c94@10000/sd@0,0
		 * That is, the scsi target number doesn't get preserved.
		 * So we pick the target number out of bootpath and use that.
		 */
		p = strstr(bootpath, "/sd@");
		if (p != NULL) {
			p += 4;
			boot_target = simple_strtoul(p, NULL, 10);
			p = strchr(p, ':');
			if (p != NULL)
				boot_part = simple_strtoul(p + 1, NULL, 10);
		}
	}
}
#endif

#if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)

kdev_t __init find_ide_boot(void)
{
	char *p;
	int n;
	kdev_t __init pmac_find_ide_boot(char *bootdevice, int n);

	if (bootdevice == NULL)
		return 0;
	p = strrchr(bootdevice, '/');
	if (p == NULL)
		return 0;
	n = p - bootdevice;

	return pmac_find_ide_boot(bootdevice, n);
}
#endif /* CONFIG_BLK_DEV_IDE && CONFIG_BLK_DEV_IDE_PMAC */

void __init find_boot_device(void)
{
#ifdef CONFIG_SCSI
	if (boot_host != NULL) {
		boot_dev = sd_find_target(boot_host, boot_target);
		if (boot_dev != 0)
			return;
	}
#endif
#if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
	boot_dev = find_ide_boot();
#endif
}

/* can't be __init - can be called whenever a disk is first accessed */
__pmac
void note_bootable_part(kdev_t dev, int part, int goodness)
{
	static int found_boot = 0;
	char *p;

	/* Do nothing if the root has been set already. */
	if ((goodness < current_root_goodness) &&
		(ROOT_DEV != to_kdev_t(DEFAULT_ROOT_DEVICE)))
		return;
	p = strstr(saved_command_line, "root=");
	if (p != NULL && (p == saved_command_line || p[-1] == ' '))
		return;

	if (!found_boot) {
		find_boot_device();
		found_boot = 1;
	}
	if (boot_dev == 0 || dev == boot_dev) {
		ROOT_DEV = MKDEV(MAJOR(dev), MINOR(dev) + part);
		boot_dev = NODEV;
		current_root_goodness = goodness;
	}
}

void
pmac_restart(char *cmd)
{
#ifdef CONFIG_ADB_CUDA
	struct adb_request req;
#endif /* CONFIG_ADB_CUDA */

	pmac_nvram_update();
	
	switch (sys_ctrler) {
#ifdef CONFIG_ADB_CUDA
	case SYS_CTRLER_CUDA:
		cuda_request(&req, NULL, 2, CUDA_PACKET,
			     CUDA_RESET_SYSTEM);
		for (;;)
			cuda_poll();
		break;
#endif /* CONFIG_ADB_CUDA */
#ifdef CONFIG_ADB_PMU		
	case SYS_CTRLER_PMU:
		pmu_restart();
		break;
#endif /* CONFIG_ADB_PMU */		
	default:
	}
}

void
pmac_power_off(void)
{
#ifdef CONFIG_ADB_CUDA
	struct adb_request req;
#endif /* CONFIG_ADB_CUDA */

	pmac_nvram_update();
	
	switch (sys_ctrler) {
#ifdef CONFIG_ADB_CUDA
	case SYS_CTRLER_CUDA:
		cuda_request(&req, NULL, 2, CUDA_PACKET,
			     CUDA_POWERDOWN);
		for (;;)
			cuda_poll();
		break;
#endif /* CONFIG_ADB_CUDA */
#ifdef CONFIG_ADB_PMU
	case SYS_CTRLER_PMU:
		pmu_shutdown();
		break;
#endif /* CONFIG_ADB_PMU */
	default:
	}
}

void
pmac_halt(void)
{
   pmac_power_off();
}


#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
/*
 * IDE stuff.
 */
void
pmac_ide_insw(ide_ioreg_t port, void *buf, int ns)
{
	_insw_ns((unsigned short *)(port+_IO_BASE), buf, ns);
}

void
pmac_ide_outsw(ide_ioreg_t port, void *buf, int ns)
{
	_outsw_ns((unsigned short *)(port+_IO_BASE), buf, ns);
}

int
pmac_ide_default_irq(ide_ioreg_t base)
{
        return 0;
}

#if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
extern ide_ioreg_t pmac_ide_get_base(int index);
#endif

ide_ioreg_t
pmac_ide_default_io_base(int index)
{
#if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
        return pmac_ide_get_base(index);
#else
	return 0;
#endif
}

int
pmac_ide_check_region(ide_ioreg_t from, unsigned int extent)
{
        return 0;
}

void
pmac_ide_request_region(ide_ioreg_t from,
			unsigned int extent,
			const char *name)
{
}

void
pmac_ide_release_region(ide_ioreg_t from,
			unsigned int extent)
{
}

/* Convert the shorts/longs in hd_driveid from little to big endian;
 * chars are endian independant, of course, but strings need to be flipped.
 * (Despite what it says in drivers/block/ide.h, they come up as little
 * endian...)
 *
 * Changes to linux/hdreg.h may require changes here. */
void
pmac_ide_fix_driveid(struct hd_driveid *id)
{
        ppc_generic_ide_fix_driveid(id);
}

#if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
/* This is declared in drivers/block/ide-pmac.c */
void pmac_ide_init_hwif_ports (hw_regs_t *hw, ide_ioreg_t data_port, ide_ioreg_t ctrl_port, int *irq);
#else
/*
 * This registers the standard ports for this architecture with the IDE
 * driver.
 */
void pmac_ide_init_hwif_ports(hw_regs_t *hw, ide_ioreg_t data_port, ide_ioreg_t ctrl_port, int *irq)
{
}
#endif
#endif

void __init
pmac_init(unsigned long r3, unsigned long r4, unsigned long r5,
	  unsigned long r6, unsigned long r7)
{
	pmac_setup_pci_ptrs();

	/* isa_io_base gets set in pmac_find_bridges */
	isa_mem_base = PMAC_ISA_MEM_BASE;
	pci_dram_offset = PMAC_PCI_DRAM_OFFSET;
	ISA_DMA_THRESHOLD = ~0L;
	DMA_MODE_READ = 1;
	DMA_MODE_WRITE = 2;

	ppc_md.setup_arch     = pmac_setup_arch;
	ppc_md.setup_residual = NULL;
	ppc_md.get_cpuinfo    = pmac_get_cpuinfo;
	ppc_md.irq_cannonicalize = NULL;
	ppc_md.init_IRQ       = pmac_pic_init;
	ppc_md.get_irq        = pmac_get_irq;
	ppc_md.init           = pmac_init2;

	ppc_md.restart        = pmac_restart;
	ppc_md.power_off      = pmac_power_off;
	ppc_md.halt           = pmac_halt;

	ppc_md.time_init      = pmac_time_init;
	ppc_md.set_rtc_time   = pmac_set_rtc_time;
	ppc_md.get_rtc_time   = pmac_get_rtc_time;
	ppc_md.calibrate_decr = pmac_calibrate_decr;

	ppc_md.pci_dev_io_base          = pmac_pci_dev_io_base;
	ppc_md.pci_dev_mem_base         = pmac_pci_dev_mem_base;
	ppc_md.pci_dev_root_bridge      = pmac_pci_dev_root_bridge;

#ifdef CONFIG_VT
#ifdef CONFIG_INPUT_ADBHID
	ppc_md.kbd_init_hw       = mac_hid_init_hw;
	ppc_md.kbd_translate     = mac_hid_kbd_translate;
	ppc_md.kbd_unexpected_up = mac_hid_kbd_unexpected_up;
	ppc_md.kbd_setkeycode    = 0;
	ppc_md.kbd_getkeycode    = 0;
#ifdef CONFIG_MAGIC_SYSRQ
#ifdef CONFIG_MAC_ADBKEYCODES
	if (!keyboard_sends_linux_keycodes) {
		ppc_md.ppc_kbd_sysrq_xlate = mac_hid_kbd_sysrq_xlate;
		SYSRQ_KEY = 0x69;
	} else
#endif /* CONFIG_MAC_ADBKEYCODES */
	{
		ppc_md.ppc_kbd_sysrq_xlate = pckbd_sysrq_xlate;
		SYSRQ_KEY = 0x54;
	}
#endif /* CONFIG_MAGIC_SYSRQ */
#elif defined(CONFIG_ADB_KEYBOARD)
	ppc_md.kbd_setkeycode    = mackbd_setkeycode;
	ppc_md.kbd_getkeycode    = mackbd_getkeycode;
	ppc_md.kbd_translate     = mackbd_translate;
	ppc_md.kbd_unexpected_up = mackbd_unexpected_up;
	ppc_md.kbd_leds          = mackbd_leds;
	ppc_md.kbd_init_hw       = mackbd_init_hw;
#ifdef CONFIG_MAGIC_SYSRQ
	ppc_md.ppc_kbd_sysrq_xlate       = mackbd_sysrq_xlate;
	SYSRQ_KEY = 0x69;
#endif /* CONFIG_MAGIC_SYSRQ */
#endif /* CONFIG_INPUT_ADBHID/CONFIG_ADB_KEYBOARD */
#endif /* CONFIG_VT */

#if defined(CONFIG_BLK_DEV_IDE) && defined(CONFIG_BLK_DEV_IDE_PMAC)
        ppc_ide_md.insw = pmac_ide_insw;
        ppc_ide_md.outsw = pmac_ide_outsw;
        ppc_ide_md.default_irq = pmac_ide_default_irq;
        ppc_ide_md.default_io_base = pmac_ide_default_io_base;
        ppc_ide_md.ide_check_region = pmac_ide_check_region;
        ppc_ide_md.ide_request_region = pmac_ide_request_region;
        ppc_ide_md.ide_release_region = pmac_ide_release_region;
        ppc_ide_md.fix_driveid = pmac_ide_fix_driveid;
        ppc_ide_md.ide_init_hwif = pmac_ide_init_hwif_ports;

        ppc_ide_md.io_base = _IO_BASE;	/* actually too early for this :-( */
#endif
#ifdef CONFIG_BOOTX_TEXT
	ppc_md.progress = pmac_progress;
#endif
	if (ppc_md.progress) ppc_md.progress("pmac_init(): exit", 0);
	
}

#ifdef CONFIG_BOOTX_TEXT
extern void drawchar(char c);
extern void drawstring(const char *c);
extern boot_infos_t *disp_bi;
void
pmac_progress(char *s, unsigned short hex)
{
	if (disp_bi == 0)
		return;
	prom_drawstring(s);
	prom_drawchar('\n');
}
#endif CONFIG_BOOTX_TEXT