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linux/of_irq.h: Generalize of_irq_to_resource()

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Determine interrupt cells via device tree.

Update #3277.
This commit is contained in:
Sebastian Huber 2018-01-10 14:11:57 +01:00
parent e4923c85c9
commit cfc149bff3
1 changed files with 51 additions and 10 deletions
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61
rtemsbsd/sys/powerpc/compat.c
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@ -362,32 +362,73 @@ of_address_to_resource(struct device_node *dn, int index,
return (0); return (0);
} }
static int
get_interrupt_cells(const void *fdt, int node)
{
do {
const fdt32_t *p;
int len;
p = fdt_getprop(fdt, node, "interrupt-parent", &len);
if (p != NULL) {
if (len != sizeof(*p))
return (-EINVAL);
node = fdt_node_offset_by_phandle(fdt,
fdt32_to_cpu(*p));
} else {
node = fdt_parent_offset(fdt, node);
}
p = fdt_getprop(fdt, node, "#interrupt-cells", &len);
if (p != NULL) {
if (len != sizeof(*p))
return (-EINVAL);
return ((int)fdt32_to_cpu(*p));
}
} while (node >= 0);
return (-EINVAL);
}
int int
of_irq_to_resource(struct device_node *dn, int index, of_irq_to_resource(struct device_node *dn, int index,
struct resource *res) struct resource *res)
{ {
const void *fdt = bsp_fdt_get(); const void *fdt = bsp_fdt_get();
int len; int len;
const fdt32_t *p; uint32_t spec_buf[8];
const fdt32_t *spec;
int node;
int ic;
int i; int i;
int j;
int item_len;
int irq; int irq;
if (res != NULL) if (res != NULL)
memset(res, 0, sizeof(*res)); memset(res, 0, sizeof(*res));
p = fdt_getprop(fdt, dn->offset, "interrupts", &len); node = dn->offset;
if (p == NULL)
spec = fdt_getprop(fdt, node, "interrupts", &len);
if (spec == NULL)
return (-EINVAL); return (-EINVAL);
i = index * 16; ic = get_interrupt_cells(fdt, node);
if (i + 16 > len) if (ic < 0 || ic >= RTEMS_ARRAY_SIZE(spec_buf))
return (EINVAL);
item_len = ic * 4;
i = index * item_len;
if (i + item_len > len)
return (-EINVAL); return (-EINVAL);
irq = (int)fdt32_to_cpu(p[i / sizeof(*p)]); for (j = 0; j < ic; ++j)
#ifdef __PPC__ spec_buf[j] = fdt32_to_cpu(spec[i / sizeof(*spec)]);
/* FIXME */
irq -= 16; irq = bsp_fdt_map_intr(spec_buf, (size_t)ic);
#endif
if (res != NULL) { if (res != NULL) {
res->start = irq; res->start = irq;