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Add support for allocating irqs for bootbus devices

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Some devices that can generate interrupts are connected directly to the
CPU through the bootbus on sun4d. This patch allows IRQs to be allocated
for such devices. The information used for allocating interrupts for
sbus devices are present at the corresponding SBI node. For bootbus
devices this information is present in the bootbus node.

Signed-off-by: Kjetil Oftedal <oftedal@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
oftedal 2011-06-01 11:11:41 +00:00 • committed by David S. Miller
parent ea16058457
commit 9eeb08986f
1 changed files with 22 additions and 12 deletions

34
arch/sparc/kernel/sun4d_irq.c
View file

@ -334,7 +334,8 @@ unsigned int sun4d_build_device_irq(struct platform_device *op,
unsigned int real_irq)
{
struct device_node *dp = op->dev.of_node;
struct device_node *io_unit, *sbi = dp->parent;
struct device_node *board_parent, *bus = dp->parent;
char *bus_connection;
const struct linux_prom_registers *regs;
unsigned int pil;
unsigned int irq;
@ -342,13 +343,20 @@ unsigned int sun4d_build_device_irq(struct platform_device *op,
int sbusl;
irq = real_irq;
while (sbi) {
if (!strcmp(sbi->name, "sbi"))
while (bus) {
if (!strcmp(bus->name, "sbi")) {
bus_connection = "io-unit";
break;
}
sbi = sbi->parent;
if (!strcmp(bus->name, "bootbus")) {
bus_connection = "cpu-unit";
break;
}
bus = bus->parent;
}
if (!sbi)
if (!bus)
goto err_out;
regs = of_get_property(dp, "reg", NULL);
@ -358,17 +366,19 @@ unsigned int sun4d_build_device_irq(struct platform_device *op,
slot = regs->which_io;
/*
* If SBI's parent is not io-unit or the io-unit lacks
* a "board#" property, something is very wrong.
* If Bus nodes parent is not io-unit/cpu-unit or the io-unit/cpu-unit
* lacks a "board#" property, something is very wrong.
*/
if (!sbi->parent || strcmp(sbi->parent->name, "io-unit")) {
printk("%s: Error, parent is not io-unit.\n", sbi->full_name);
if (!bus->parent || strcmp(bus->parent->name, bus_connection)) {
printk(KERN_ERR "%s: Error, parent is not %s.\n",
bus->full_name, bus_connection);
goto err_out;
}
io_unit = sbi->parent;
board = of_getintprop_default(io_unit, "board#", -1);
board_parent = bus->parent;
board = of_getintprop_default(board_parent, "board#", -1);
if (board == -1) {
printk("%s: Error, lacks board# property.\n", io_unit->full_name);
printk(KERN_ERR "%s: Error, lacks board# property.\n",
board_parent->full_name);
goto err_out;
}