of_device.c

来自「linux 内核源代码」· C语言 代码 · 共 897 行 · 第 1/2 页

	if (!parent)
		return;

	p_op = to_of_device(parent);
	bus = of_match_bus(p_op->node);
	bus->count_cells(op->node, &na, &ns);

	preg = of_get_property(op->node, bus->addr_prop_name, &num_reg);
	if (!preg || num_reg == 0)
		return;

	/* Convert to num-cells.  */
	num_reg /= 4;

	/* Convert to num-entries.  */
	num_reg /= na + ns;

	/* Prevent overrunning the op->resources[] array.  */
	if (num_reg > PROMREG_MAX) {
		printk(KERN_WARNING "%s: Too many regs (%d), "
		       "limiting to %d.\n",
		       op->node->full_name, num_reg, PROMREG_MAX);
		num_reg = PROMREG_MAX;
	}

	for (index = 0; index < num_reg; index++) {
		struct resource *r = &op->resource[index];
		u32 addr[OF_MAX_ADDR_CELLS];
		const u32 *reg = (preg + (index * ((na + ns) * 4)));
		struct device_node *dp = op->node;
		struct device_node *pp = p_op->node;
		struct of_bus *pbus, *dbus;
		u64 size, result = OF_BAD_ADDR;
		unsigned long flags;
		int dna, dns;
		int pna, pns;

		size = of_read_addr(reg + na, ns);
		flags = bus->get_flags(reg);

		memcpy(addr, reg, na * 4);

		if (use_1to1_mapping(pp)) {
			result = of_read_addr(addr, na);
			goto build_res;
		}

		dna = na;
		dns = ns;
		dbus = bus;

		while (1) {
			dp = pp;
			pp = dp->parent;
			if (!pp) {
				result = of_read_addr(addr, dna);
				break;
			}

			pbus = of_match_bus(pp);
			pbus->count_cells(dp, &pna, &pns);

			if (build_one_resource(dp, dbus, pbus, addr,
					       dna, dns, pna))
				break;

			dna = pna;
			dns = pns;
			dbus = pbus;
		}

	build_res:
		memset(r, 0, sizeof(*r));

		if (of_resource_verbose)
			printk("%s reg[%d] -> %lx\n",
			       op->node->full_name, index,
			       result);

		if (result != OF_BAD_ADDR) {
			if (tlb_type == hypervisor)
				result &= 0x0fffffffffffffffUL;

			r->start = result;
			r->end = result + size - 1;
			r->flags = flags;
		}
		r->name = op->node->name;
	}
}

static struct device_node * __init
apply_interrupt_map(struct device_node *dp, struct device_node *pp,
		    const u32 *imap, int imlen, const u32 *imask,
		    unsigned int *irq_p)
{
	struct device_node *cp;
	unsigned int irq = *irq_p;
	struct of_bus *bus;
	phandle handle;
	const u32 *reg;
	int na, num_reg, i;

	bus = of_match_bus(pp);
	bus->count_cells(dp, &na, NULL);

	reg = of_get_property(dp, "reg", &num_reg);
	if (!reg || !num_reg)
		return NULL;

	imlen /= ((na + 3) * 4);
	handle = 0;
	for (i = 0; i < imlen; i++) {
		int j;

		for (j = 0; j < na; j++) {
			if ((reg[j] & imask[j]) != imap[j])
				goto next;
		}
		if (imap[na] == irq) {
			handle = imap[na + 1];
			irq = imap[na + 2];
			break;
		}

	next:
		imap += (na + 3);
	}
	if (i == imlen) {
		/* Psycho and Sabre PCI controllers can have 'interrupt-map'
		 * properties that do not include the on-board device
		 * interrupts.  Instead, the device's 'interrupts' property
		 * is already a fully specified INO value.
		 *
		 * Handle this by deciding that, if we didn't get a
		 * match in the parent's 'interrupt-map', and the
		 * parent is an IRQ translater, then use the parent as
		 * our IRQ controller.
		 */
		if (pp->irq_trans)
			return pp;

		return NULL;
	}

	*irq_p = irq;
	cp = of_find_node_by_phandle(handle);

	return cp;
}

static unsigned int __init pci_irq_swizzle(struct device_node *dp,
					   struct device_node *pp,
					   unsigned int irq)
{
	const struct linux_prom_pci_registers *regs;
	unsigned int bus, devfn, slot, ret;

	if (irq < 1 || irq > 4)
		return irq;

	regs = of_get_property(dp, "reg", NULL);
	if (!regs)
		return irq;

	bus = (regs->phys_hi >> 16) & 0xff;
	devfn = (regs->phys_hi >> 8) & 0xff;
	slot = (devfn >> 3) & 0x1f;

	if (pp->irq_trans) {
		/* Derived from Table 8-3, U2P User's Manual.  This branch
		 * is handling a PCI controller that lacks a proper set of
		 * interrupt-map and interrupt-map-mask properties.  The
		 * Ultra-E450 is one example.
		 *
		 * The bit layout is BSSLL, where:
		 * B: 0 on bus A, 1 on bus B
		 * D: 2-bit slot number, derived from PCI device number as
		 *    (dev - 1) for bus A, or (dev - 2) for bus B
		 * L: 2-bit line number
		 */
		if (bus & 0x80) {
			/* PBM-A */
			bus  = 0x00;
			slot = (slot - 1) << 2;
		} else {
			/* PBM-B */
			bus  = 0x10;
			slot = (slot - 2) << 2;
		}
		irq -= 1;

		ret = (bus | slot | irq);
	} else {
		/* Going through a PCI-PCI bridge that lacks a set of
		 * interrupt-map and interrupt-map-mask properties.
		 */
		ret = ((irq - 1 + (slot & 3)) & 3) + 1;
	}

	return ret;
}

static int of_irq_verbose;

static unsigned int __init build_one_device_irq(struct of_device *op,
						struct device *parent,
						unsigned int irq)
{
	struct device_node *dp = op->node;
	struct device_node *pp, *ip;
	unsigned int orig_irq = irq;

	if (irq == 0xffffffff)
		return irq;

	if (dp->irq_trans) {
		irq = dp->irq_trans->irq_build(dp, irq,
					       dp->irq_trans->data);

		if (of_irq_verbose)
			printk("%s: direct translate %x --> %x\n",
			       dp->full_name, orig_irq, irq);

		return irq;
	}

	/* Something more complicated.  Walk up to the root, applying
	 * interrupt-map or bus specific translations, until we hit
	 * an IRQ translator.
	 *
	 * If we hit a bus type or situation we cannot handle, we
	 * stop and assume that the original IRQ number was in a
	 * format which has special meaning to it's immediate parent.
	 */
	pp = dp->parent;
	ip = NULL;
	while (pp) {
		const void *imap, *imsk;
		int imlen;

		imap = of_get_property(pp, "interrupt-map", &imlen);
		imsk = of_get_property(pp, "interrupt-map-mask", NULL);
		if (imap && imsk) {
			struct device_node *iret;
			int this_orig_irq = irq;

			iret = apply_interrupt_map(dp, pp,
						   imap, imlen, imsk,
						   &irq);

			if (of_irq_verbose)
				printk("%s: Apply [%s:%x] imap --> [%s:%x]\n",
				       op->node->full_name,
				       pp->full_name, this_orig_irq,
				       (iret ? iret->full_name : "NULL"), irq);

			if (!iret)
				break;

			if (iret->irq_trans) {
				ip = iret;
				break;
			}
		} else {
			if (!strcmp(pp->type, "pci") ||
			    !strcmp(pp->type, "pciex")) {
				unsigned int this_orig_irq = irq;

				irq = pci_irq_swizzle(dp, pp, irq);
				if (of_irq_verbose)
					printk("%s: PCI swizzle [%s] "
					       "%x --> %x\n",
					       op->node->full_name,
					       pp->full_name, this_orig_irq,
					       irq);

			}

			if (pp->irq_trans) {
				ip = pp;
				break;
			}
		}
		dp = pp;
		pp = pp->parent;
	}
	if (!ip)
		return orig_irq;

	irq = ip->irq_trans->irq_build(op->node, irq,
				       ip->irq_trans->data);
	if (of_irq_verbose)
		printk("%s: Apply IRQ trans [%s] %x --> %x\n",
		       op->node->full_name, ip->full_name, orig_irq, irq);

	return irq;
}

static struct of_device * __init scan_one_device(struct device_node *dp,
						 struct device *parent)
{
	struct of_device *op = kzalloc(sizeof(*op), GFP_KERNEL);
	const unsigned int *irq;
	struct dev_archdata *sd;
	int len, i;

	if (!op)
		return NULL;

	sd = &op->dev.archdata;
	sd->prom_node = dp;
	sd->op = op;

	op->node = dp;

	op->clock_freq = of_getintprop_default(dp, "clock-frequency",
					       (25*1000*1000));
	op->portid = of_getintprop_default(dp, "upa-portid", -1);
	if (op->portid == -1)
		op->portid = of_getintprop_default(dp, "portid", -1);

	irq = of_get_property(dp, "interrupts", &len);
	if (irq) {
		memcpy(op->irqs, irq, len);
		op->num_irqs = len / 4;
	} else {
		op->num_irqs = 0;
	}

	/* Prevent overrunning the op->irqs[] array.  */
	if (op->num_irqs > PROMINTR_MAX) {
		printk(KERN_WARNING "%s: Too many irqs (%d), "
		       "limiting to %d.\n",
		       dp->full_name, op->num_irqs, PROMINTR_MAX);
		op->num_irqs = PROMINTR_MAX;
	}

	build_device_resources(op, parent);
	for (i = 0; i < op->num_irqs; i++)
		op->irqs[i] = build_one_device_irq(op, parent, op->irqs[i]);

	op->dev.parent = parent;
	op->dev.bus = &of_platform_bus_type;
	if (!parent)
		strcpy(op->dev.bus_id, "root");
	else
		sprintf(op->dev.bus_id, "%08x", dp->node);

	if (of_device_register(op)) {
		printk("%s: Could not register of device.\n",
		       dp->full_name);
		kfree(op);
		op = NULL;
	}

	return op;
}

static void __init scan_tree(struct device_node *dp, struct device *parent)
{
	while (dp) {
		struct of_device *op = scan_one_device(dp, parent);

		if (op)
			scan_tree(dp->child, &op->dev);

		dp = dp->sibling;
	}
}

static void __init scan_of_devices(void)
{
	struct device_node *root = of_find_node_by_path("/");
	struct of_device *parent;

	parent = scan_one_device(root, NULL);
	if (!parent)
		return;

	scan_tree(root->child, &parent->dev);
}

static int __init of_bus_driver_init(void)
{
	int err;

	err = of_bus_type_init(&of_platform_bus_type, "of");
#ifdef CONFIG_PCI
	if (!err)
		err = of_bus_type_init(&isa_bus_type, "isa");
	if (!err)
		err = of_bus_type_init(&ebus_bus_type, "ebus");
#endif
#ifdef CONFIG_SBUS
	if (!err)
		err = of_bus_type_init(&sbus_bus_type, "sbus");
#endif

	if (!err)
		scan_of_devices();

	return err;
}

postcore_initcall(of_bus_driver_init);

static int __init of_debug(char *str)
{
	int val = 0;

	get_option(&str, &val);
	if (val & 1)
		of_resource_verbose = 1;
	if (val & 2)
		of_irq_verbose = 1;
	return 1;
}

__setup("of_debug=", of_debug);

struct of_device* of_platform_device_create(struct device_node *np,
					    const char *bus_id,
					    struct device *parent,
					    struct bus_type *bus)
{
	struct of_device *dev;

	dev = kzalloc(sizeof(*dev), GFP_KERNEL);
	if (!dev)
		return NULL;

	dev->dev.parent = parent;
	dev->dev.bus = bus;
	dev->dev.release = of_release_dev;

	strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);

	if (of_device_register(dev) != 0) {
		kfree(dev);
		return NULL;
	}

	return dev;
}
EXPORT_SYMBOL(of_platform_device_create);