chrp_setup.c

讲述linux的初始化过程

		return irq;
	}
}

int __chrp chrp_get_irq( struct pt_regs *regs )
{
        int irq;

        irq = openpic_irq( smp_processor_id() );
        if (irq == IRQ_8259_CASCADE)
        {
                /*
                 * This magic address generates a PCI IACK cycle.
                 */
		if ( chrp_int_ack_special )
			irq = *chrp_int_ack_special;
		else
			irq = i8259_irq( smp_processor_id() );
		openpic_eoi( smp_processor_id() );
        }
        if (irq == OPENPIC_VEC_SPURIOUS)
                /*
                 * Spurious interrupts should never be
                 * acknowledged
                 */
		irq = -1;
	/*
	 * I would like to openpic_eoi here but there seem to be timing problems
	 * between the openpic ack and the openpic eoi.
	 *   -- Cort
	 */
	return irq;
}

void __chrp chrp_post_irq(struct pt_regs* regs, int irq)
{
	/*
	 * If it's an i8259 irq then we've already done the
	 * openpic irq.  So we just check to make sure the controller
	 * is an openpic and if it is then eoi
	 *
	 * We do it this way since our irq_desc[irq].handler can change
	 * with RTL and no longer be open_pic -- Cort
	 */
	if ( irq >= open_pic_irq_offset)
		openpic_eoi( smp_processor_id() );
}

void __init chrp_init_IRQ(void)
{
	struct device_node *np;
	int i;
	unsigned long *addrp;

	if (!(np = find_devices("pci"))
	    || !(addrp = (unsigned long *)
		 get_property(np, "8259-interrupt-acknowledge", NULL)))
		printk("Cannot find pci to get ack address\n");
	else
		chrp_int_ack_special = (volatile unsigned char *)
			ioremap(*addrp, 1);
	open_pic_irq_offset = 16;
	for ( i = 16 ; i < NR_IRQS ; i++ )
		irq_desc[i].handler = &open_pic;
	openpic_init(1);
	enable_irq(IRQ_8259_CASCADE);
	for ( i = 0 ; i < 16  ; i++ )
		irq_desc[i].handler = &i8259_pic;
	i8259_init();
#ifdef CONFIG_XMON
	request_irq(openpic_to_irq(HYDRA_INT_ADB_NMI),
		    xmon_irq, 0, "NMI", 0);
#endif	/* CONFIG_XMON */
#ifdef CONFIG_SMP
	request_irq(openpic_to_irq(OPENPIC_VEC_IPI),
		    openpic_ipi_action, 0, "IPI0", 0);
#endif	/* CONFIG_SMP */
}

void __init
chrp_init2(void)
{
#if defined(CONFIG_VT) && defined(CONFIG_ADB_KEYBOARD)
	struct device_node *kbd;
#endif
#ifdef CONFIG_NVRAM  
	pmac_nvram_init();
#endif

	request_region(0x20,0x20,"pic1");
	request_region(0xa0,0x20,"pic2");
	request_region(0x00,0x20,"dma1");
	request_region(0x40,0x20,"timer");
	request_region(0x80,0x10,"dma page reg");
	request_region(0xc0,0x20,"dma2");

	if (ppc_md.progress)
		ppc_md.progress("  Have fun!    ", 0x7777);

#if defined(CONFIG_VT) && defined(CONFIG_ADB_KEYBOARD)
	/* see if there is a keyboard in the device tree
	   with a parent of type "adb" */
	for (kbd = find_devices("keyboard"); kbd; kbd = kbd->next)
		if (kbd->parent && kbd->parent->type
		    && strcmp(kbd->parent->type, "adb") == 0)
			break;
	if (kbd) {
		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_VT && CONFIG_ADB_KEYBOARD */
}

#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
/*
 * IDE stuff.
 */
unsigned int chrp_ide_irq = 0;
int chrp_ide_ports_known = 0;
ide_ioreg_t chrp_ide_regbase[MAX_HWIFS];
ide_ioreg_t chrp_idedma_regbase;

void __chrp
chrp_ide_probe(void)
{
        struct pci_dev *pdev = pci_find_device(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105, NULL);

        chrp_ide_ports_known = 1;

        if(pdev) {
                chrp_ide_regbase[0]=pdev->resource[0].start;
                chrp_ide_regbase[1]=pdev->resource[2].start;
                chrp_idedma_regbase=pdev->resource[4].start;
                chrp_ide_irq=pdev->irq;
        }
}

void __chrp
chrp_ide_insw(ide_ioreg_t port, void *buf, int ns)
{
	ide_insw(port+_IO_BASE, buf, ns);
}

void __chrp
chrp_ide_outsw(ide_ioreg_t port, void *buf, int ns)
{
	ide_outsw(port+_IO_BASE, buf, ns);
}

int __chrp
chrp_ide_default_irq(ide_ioreg_t base)
{
        if (chrp_ide_ports_known == 0)
	        chrp_ide_probe();
	return chrp_ide_irq;
}

ide_ioreg_t __chrp
chrp_ide_default_io_base(int index)
{
        if (chrp_ide_ports_known == 0)
	        chrp_ide_probe();
	return chrp_ide_regbase[index];
}

int __chrp
chrp_ide_check_region(ide_ioreg_t from, unsigned int extent)
{
        return check_region(from, extent);
}

void __chrp
chrp_ide_request_region(ide_ioreg_t from,
			unsigned int extent,
			const char *name)
{
        request_region(from, extent, name);
}

void __chrp
chrp_ide_release_region(ide_ioreg_t from,
			unsigned int extent)
{
        release_region(from, extent);
}

void __chrp
chrp_ide_fix_driveid(struct hd_driveid *id)
{
        ppc_generic_ide_fix_driveid(id);
}

void __chrp
chrp_ide_init_hwif_ports(hw_regs_t *hw, ide_ioreg_t data_port, ide_ioreg_t ctrl_port, int *irq)
{
	ide_ioreg_t reg = data_port;
	int i;

	for (i = IDE_DATA_OFFSET; i <= IDE_STATUS_OFFSET; i++) {
		hw->io_ports[i] = reg;
		reg += 1;
	}
	if (ctrl_port) {
		hw->io_ports[IDE_CONTROL_OFFSET] = ctrl_port;
	} else {
		hw->io_ports[IDE_CONTROL_OFFSET] = 0;
	}
	if (irq != NULL)
		hw->irq = chrp_ide_irq;
}

#endif

void __init
	   chrp_init(unsigned long r3, unsigned long r4, unsigned long r5,
		     unsigned long r6, unsigned long r7)
{
	chrp_setup_pci_ptrs();
#ifdef CONFIG_BLK_DEV_INITRD
	/* take care of initrd if we have one */
	if ( r6 )
	{
		initrd_start = r6 + KERNELBASE;
		initrd_end = r6 + r7 + KERNELBASE;
	}
#endif /* CONFIG_BLK_DEV_INITRD */

        /* pci_dram_offset/isa_io_base/isa_mem_base set by setup_pci_ptrs() */
	ISA_DMA_THRESHOLD = ~0L;
	DMA_MODE_READ = 0x44;
	DMA_MODE_WRITE = 0x48;

	ppc_md.setup_arch     = chrp_setup_arch;
	ppc_md.setup_residual = NULL;
	ppc_md.get_cpuinfo    = chrp_get_cpuinfo;
	ppc_md.irq_cannonicalize = chrp_irq_cannonicalize;
#ifndef CONFIG_POWER4
	ppc_md.init_IRQ       = chrp_init_IRQ;
	ppc_md.get_irq        = chrp_get_irq;
	ppc_md.post_irq	      = chrp_post_irq;
#else
	ppc_md.init_IRQ	      = xics_init_IRQ;
	ppc_md.get_irq	      = xics_get_irq;
	ppc_md.post_irq	      = NULL;
#endif /* CONFIG_POWER4 */

	ppc_md.init           = chrp_init2;

	ppc_md.restart        = chrp_restart;
	ppc_md.power_off      = chrp_power_off;
	ppc_md.halt           = chrp_halt;

	ppc_md.time_init      = chrp_time_init;
	ppc_md.set_rtc_time   = chrp_set_rtc_time;
	ppc_md.get_rtc_time   = chrp_get_rtc_time;
	ppc_md.calibrate_decr = chrp_calibrate_decr;

#ifdef CONFIG_VT
	/* these are adjusted in chrp_init2 if we have an ADB keyboard */
	ppc_md.kbd_setkeycode    = pckbd_setkeycode;
	ppc_md.kbd_getkeycode    = pckbd_getkeycode;
	ppc_md.kbd_translate     = pckbd_translate;
	ppc_md.kbd_unexpected_up = pckbd_unexpected_up;
	ppc_md.kbd_leds          = pckbd_leds;
	ppc_md.kbd_init_hw       = pckbd_init_hw;
#ifdef CONFIG_MAGIC_SYSRQ
	ppc_md.ppc_kbd_sysrq_xlate	 = pckbd_sysrq_xlate;
	SYSRQ_KEY = 0x54;
#endif /* CONFIG_MAGIC_SYSRQ */
#endif /* CONFIG_VT */

	if (rtas_data) {
		struct device_node *rtas;
		unsigned int *p;

		rtas = find_devices("rtas");
		if (rtas != NULL) {
			if (get_property(rtas, "display-character", NULL)) {
				ppc_md.progress = rtas_display_progress;
				p = (unsigned int *) get_property
				       (rtas, "ibm,display-line-length", NULL);
				if (p)
					max_width = *p;
			} else if (get_property(rtas, "set-indicator", NULL))
				ppc_md.progress = rtas_indicator_progress;
		}
	}
#ifdef CONFIG_BOOTX_TEXT
	if (ppc_md.progress == NULL && bootx_text_mapped)
		ppc_md.progress = bootx_text_progress;
#endif

#if defined(CONFIG_BLK_DEV_IDE) || defined(CONFIG_BLK_DEV_IDE_MODULE)
        ppc_ide_md.insw = chrp_ide_insw;
        ppc_ide_md.outsw = chrp_ide_outsw;
        ppc_ide_md.default_irq = chrp_ide_default_irq;
        ppc_ide_md.default_io_base = chrp_ide_default_io_base;
        ppc_ide_md.ide_check_region = chrp_ide_check_region;
        ppc_ide_md.ide_request_region = chrp_ide_request_region;
        ppc_ide_md.ide_release_region = chrp_ide_release_region;
        ppc_ide_md.fix_driveid = chrp_ide_fix_driveid;
        ppc_ide_md.ide_init_hwif = chrp_ide_init_hwif_ports;

        ppc_ide_md.io_base = _IO_BASE;
#endif
	/*
	 * Print the banner, then scroll down so boot progress
	 * can be printed.  -- Cort 
	 */
	if ( ppc_md.progress ) ppc_md.progress("Linux/PPC "UTS_RELEASE"\n", 0x0);
}

void __chrp
rtas_display_progress(char *s, unsigned short hex)
{
	int width;
	char *os = s;

	if ( call_rtas( "display-character", 1, 1, NULL, '\r' ) )
		return;

	width = max_width;
	while ( *os )
	{
		if ( (*os == '\n') || (*os == '\r') )
			width = max_width;
		else
			width--;
		call_rtas( "display-character", 1, 1, NULL, *os++ );
		/* if we overwrite the screen length */
		if ( width == 0 )
			while ( (*os != 0) && (*os != '\n') && (*os != '\r') )
				os++;
	}

	/*while ( width-- > 0 )*/
	call_rtas( "display-character", 1, 1, NULL, ' ' );
}

void __chrp
rtas_indicator_progress(char *s, unsigned short hex)
{
	call_rtas("set-indicator", 3, 1, NULL, 6, 0, hex);
}

#ifdef CONFIG_BOOTX_TEXT
void
bootx_text_progress(char *s, unsigned short hex)
{
	prom_print(s);
	prom_print("\n");
}
#endif /* CONFIG_BOOTX_TEXT */