pic.c

linux-2.6.15.6

{
	unsigned char bus, devfn;
	unsigned short cmd;
        unsigned long addr;
	struct device_node *irqctrler = find_devices("pci106b,7");
	struct device_node *ether;

	if (irqctrler == NULL || irqctrler->n_addrs <= 0)
		return -1;
	addr = (unsigned long) ioremap(irqctrler->addrs[0].address, 0x40);
	pmac_irq_hw[1] = (volatile struct pmac_irq_hw *)(addr + 0x20);
	max_irqs = 64;
	if (pci_device_from_OF_node(irqctrler, &bus, &devfn) == 0) {
		struct pci_controller* hose = pci_find_hose_for_OF_device(irqctrler);
		if (!hose)
		    printk(KERN_ERR "Can't find PCI hose for OHare2 !\n");
		else {
		    early_read_config_word(hose, bus, devfn, PCI_COMMAND, &cmd);
		    cmd |= PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
	  	    cmd &= ~PCI_COMMAND_IO;
		    early_write_config_word(hose, bus, devfn, PCI_COMMAND, cmd);
		}
	}

	/* Fix interrupt for the modem/ethernet combo controller. The number
	   in the device tree (27) is bogus (correct for the ethernet-only
	   board but not the combo ethernet/modem board).
	   The real interrupt is 28 on the second controller -> 28+32 = 60.
	*/
	ether = find_devices("pci1011,14");
	if (ether && ether->n_intrs > 0) {
		ether->intrs[0].line = 60;
		printk(KERN_INFO "irq: Fixed ethernet IRQ to %d\n",
		       ether->intrs[0].line);
	}

	/* Return the interrupt number of the cascade */
	return irqctrler->intrs[0].line;
}

#ifdef CONFIG_XMON
static struct irqaction xmon_action = {
	.handler	= xmon_irq,
	.flags		= 0,
	.mask		= CPU_MASK_NONE,
	.name		= "NMI - XMON"
};
#endif

static struct irqaction gatwick_cascade_action = {
	.handler	= gatwick_action,
	.flags		= SA_INTERRUPT,
	.mask		= CPU_MASK_NONE,
	.name		= "cascade",
};
#endif /* CONFIG_PPC32 */

static int pmac_u3_cascade(struct pt_regs *regs, void *data)
{
	return mpic_get_one_irq((struct mpic *)data, regs);
}

void __init pmac_pic_init(void)
{
        struct device_node *irqctrler  = NULL;
        struct device_node *irqctrler2 = NULL;
	struct device_node *np;
#ifdef CONFIG_PPC32
        int i;
        unsigned long addr;
	int irq_cascade = -1;
#endif
	struct mpic *mpic1, *mpic2;

	/* We first try to detect Apple's new Core99 chipset, since mac-io
	 * is quite different on those machines and contains an IBM MPIC2.
	 */
	np = find_type_devices("open-pic");
	while (np) {
		if (np->parent && !strcmp(np->parent->name, "u3"))
			irqctrler2 = np;
		else
			irqctrler = np;
		np = np->next;
	}
	if (irqctrler != NULL && irqctrler->n_addrs > 0) {
		unsigned char senses[128];

		printk(KERN_INFO "PowerMac using OpenPIC irq controller at 0x%08x\n",
		       (unsigned int)irqctrler->addrs[0].address);
		pmac_call_feature(PMAC_FTR_ENABLE_MPIC, irqctrler, 0, 0);

		prom_get_irq_senses(senses, 0, 128);
		mpic1 = mpic_alloc(irqctrler->addrs[0].address,
				   MPIC_PRIMARY | MPIC_WANTS_RESET,
				   0, 0, 128, 252, senses, 128, " OpenPIC  ");
		BUG_ON(mpic1 == NULL);
		mpic_init(mpic1);		

		if (irqctrler2 != NULL && irqctrler2->n_intrs > 0 &&
		    irqctrler2->n_addrs > 0) {
			printk(KERN_INFO "Slave OpenPIC at 0x%08x hooked on IRQ %d\n",
			       (u32)irqctrler2->addrs[0].address,
			       irqctrler2->intrs[0].line);

			pmac_call_feature(PMAC_FTR_ENABLE_MPIC, irqctrler2, 0, 0);
			prom_get_irq_senses(senses, 128, 128 + 124);

			/* We don't need to set MPIC_BROKEN_U3 here since we don't have
			 * hypertransport interrupts routed to it
			 */
			mpic2 = mpic_alloc(irqctrler2->addrs[0].address,
					   MPIC_BIG_ENDIAN | MPIC_WANTS_RESET,
					   0, 128, 124, 0, senses, 124,
					   " U3-MPIC  ");
			BUG_ON(mpic2 == NULL);
			mpic_init(mpic2);
			mpic_setup_cascade(irqctrler2->intrs[0].line,
					   pmac_u3_cascade, mpic2);
		}
#if defined(CONFIG_XMON) && defined(CONFIG_PPC32)
		{
			struct device_node* pswitch;
			int nmi_irq;

			pswitch = find_devices("programmer-switch");
			if (pswitch && pswitch->n_intrs) {
				nmi_irq = pswitch->intrs[0].line;
				mpic_irq_set_priority(nmi_irq, 9);
				setup_irq(nmi_irq, &xmon_action);
			}
		}
#endif	/* CONFIG_XMON */
		return;
	}
	irqctrler = NULL;

#ifdef CONFIG_PPC32
	/* Get the level/edge settings, assume if it's not
	 * a Grand Central nor an OHare, then it's an Heathrow
	 * (or Paddington).
	 */
	ppc_md.get_irq = pmac_get_irq;
	if (find_devices("gc"))
		level_mask[0] = GC_LEVEL_MASK;
	else if (find_devices("ohare")) {
		level_mask[0] = OHARE_LEVEL_MASK;
		/* We might have a second cascaded ohare */
		level_mask[1] = OHARE_LEVEL_MASK;
	} else {
		level_mask[0] = HEATHROW_LEVEL_MASK;
		level_mask[1] = 0;
		/* We might have a second cascaded heathrow */
		level_mask[2] = HEATHROW_LEVEL_MASK;
		level_mask[3] = 0;
	}

	/*
	 * G3 powermacs and 1999 G3 PowerBooks have 64 interrupts,
	 * 1998 G3 Series PowerBooks have 128,
	 * other powermacs have 32.
	 * The combo ethernet/modem card for the Powerstar powerbooks
	 * (2400/3400/3500, ohare based) has a second ohare chip
	 * effectively making a total of 64.
	 */
	max_irqs = max_real_irqs = 32;
	irqctrler = find_devices("mac-io");
	if (irqctrler)
	{
		max_real_irqs = 64;
		if (irqctrler->next)
			max_irqs = 128;
		else
			max_irqs = 64;
	}
	for ( i = 0; i < max_real_irqs ; i++ )
		irq_desc[i].handler = &pmac_pic;

	/* get addresses of first controller */
	if (irqctrler) {
		if  (irqctrler->n_addrs > 0) {
			addr = (unsigned long)
				ioremap(irqctrler->addrs[0].address, 0x40);
			for (i = 0; i < 2; ++i)
				pmac_irq_hw[i] = (volatile struct pmac_irq_hw*)
					(addr + (2 - i) * 0x10);
		}

		/* get addresses of second controller */
		irqctrler = irqctrler->next;
		if (irqctrler && irqctrler->n_addrs > 0) {
			addr = (unsigned long)
				ioremap(irqctrler->addrs[0].address, 0x40);
			for (i = 2; i < 4; ++i)
				pmac_irq_hw[i] = (volatile struct pmac_irq_hw*)
					(addr + (4 - i) * 0x10);
			irq_cascade = irqctrler->intrs[0].line;
			if (device_is_compatible(irqctrler, "gatwick"))
				pmac_fix_gatwick_interrupts(irqctrler, max_real_irqs);
		}
	} else {
		/* older powermacs have a GC (grand central) or ohare at
		   f3000000, with interrupt control registers at f3000020. */
		addr = (unsigned long) ioremap(0xf3000000, 0x40);
		pmac_irq_hw[0] = (volatile struct pmac_irq_hw *) (addr + 0x20);
	}

	/* PowerBooks 3400 and 3500 can have a second controller in a second
	   ohare chip, on the combo ethernet/modem card */
	if (machine_is_compatible("AAPL,3400/2400")
	     || machine_is_compatible("AAPL,3500"))
		irq_cascade = enable_second_ohare();

	/* disable all interrupts in all controllers */
	for (i = 0; i * 32 < max_irqs; ++i)
		out_le32(&pmac_irq_hw[i]->enable, 0);
	/* mark level interrupts */
	for (i = 0; i < max_irqs; i++)
		if (level_mask[i >> 5] & (1UL << (i & 0x1f)))
			irq_desc[i].status = IRQ_LEVEL;

	/* get interrupt line of secondary interrupt controller */
	if (irq_cascade >= 0) {
		printk(KERN_INFO "irq: secondary controller on irq %d\n",
			(int)irq_cascade);
		for ( i = max_real_irqs ; i < max_irqs ; i++ )
			irq_desc[i].handler = &gatwick_pic;
		setup_irq(irq_cascade, &gatwick_cascade_action);
	}
	printk("System has %d possible interrupts\n", max_irqs);
	if (max_irqs != max_real_irqs)
		printk(KERN_DEBUG "%d interrupts on main controller\n",
			max_real_irqs);

#ifdef CONFIG_XMON
	setup_irq(20, &xmon_action);
#endif	/* CONFIG_XMON */
#endif	/* CONFIG_PPC32 */
}

#if defined(CONFIG_PM) && defined(CONFIG_PPC32)
/*
 * These procedures are used in implementing sleep on the powerbooks.
 * sleep_save_intrs() saves the states of all interrupt enables
 * and disables all interrupts except for the nominated one.
 * sleep_restore_intrs() restores the states of all interrupt enables.
 */
unsigned long sleep_save_mask[2];

/* This used to be passed by the PMU driver but that link got
 * broken with the new driver model. We use this tweak for now...
 */
static int pmacpic_find_viaint(void)
{
	int viaint = -1;

#ifdef CONFIG_ADB_PMU
	struct device_node *np;

	if (pmu_get_model() != PMU_OHARE_BASED)
		goto not_found;
	np = of_find_node_by_name(NULL, "via-pmu");
	if (np == NULL)
		goto not_found;
	viaint = np->intrs[0].line;
#endif /* CONFIG_ADB_PMU */

not_found:
	return viaint;
}

static int pmacpic_suspend(struct sys_device *sysdev, pm_message_t state)
{
	int viaint = pmacpic_find_viaint();

	sleep_save_mask[0] = ppc_cached_irq_mask[0];
	sleep_save_mask[1] = ppc_cached_irq_mask[1];
	ppc_cached_irq_mask[0] = 0;
	ppc_cached_irq_mask[1] = 0;
	if (viaint > 0)
		set_bit(viaint, ppc_cached_irq_mask);
	out_le32(&pmac_irq_hw[0]->enable, ppc_cached_irq_mask[0]);
	if (max_real_irqs > 32)
		out_le32(&pmac_irq_hw[1]->enable, ppc_cached_irq_mask[1]);
	(void)in_le32(&pmac_irq_hw[0]->event);
	/* make sure mask gets to controller before we return to caller */
	mb();
        (void)in_le32(&pmac_irq_hw[0]->enable);

        return 0;
}

static int pmacpic_resume(struct sys_device *sysdev)
{
	int i;

	out_le32(&pmac_irq_hw[0]->enable, 0);
	if (max_real_irqs > 32)
		out_le32(&pmac_irq_hw[1]->enable, 0);
	mb();
	for (i = 0; i < max_real_irqs; ++i)
		if (test_bit(i, sleep_save_mask))
			pmac_unmask_irq(i);

	return 0;
}

#endif /* CONFIG_PM && CONFIG_PPC32 */

static struct sysdev_class pmacpic_sysclass = {
	set_kset_name("pmac_pic"),
};

static struct sys_device device_pmacpic = {
	.id		= 0,
	.cls		= &pmacpic_sysclass,
};

static struct sysdev_driver driver_pmacpic = {
#if defined(CONFIG_PM) && defined(CONFIG_PPC32)
	.suspend	= &pmacpic_suspend,
	.resume		= &pmacpic_resume,
#endif /* CONFIG_PM && CONFIG_PPC32 */
};

static int __init init_pmacpic_sysfs(void)
{
#ifdef CONFIG_PPC32
	if (max_irqs == 0)
		return -ENODEV;
#endif
	printk(KERN_DEBUG "Registering pmac pic with sysfs...\n");
	sysdev_class_register(&pmacpic_sysclass);
	sysdev_register(&device_pmacpic);
	sysdev_driver_register(&pmacpic_sysclass, &driver_pmacpic);
	return 0;
}

subsys_initcall(init_pmacpic_sysfs);