mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
2.2 KiB
98 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Copyright 2006-2007, Michael Ellerman, IBM Corporation. |
|
*/ |
|
|
|
#include <linux/irq.h> |
|
#include <linux/bitmap.h> |
|
#include <linux/msi.h> |
|
#include <asm/mpic.h> |
|
#include <asm/prom.h> |
|
#include <asm/hw_irq.h> |
|
#include <asm/ppc-pci.h> |
|
#include <asm/msi_bitmap.h> |
|
|
|
#include <sysdev/mpic.h> |
|
|
|
void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq) |
|
{ |
|
/* The mpic calls this even when there is no allocator setup */ |
|
if (!mpic->msi_bitmap.bitmap) |
|
return; |
|
|
|
msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq); |
|
} |
|
|
|
#ifdef CONFIG_MPIC_U3_HT_IRQS |
|
static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic) |
|
{ |
|
irq_hw_number_t hwirq; |
|
const struct irq_domain_ops *ops = mpic->irqhost->ops; |
|
struct device_node *np; |
|
int flags, index, i; |
|
struct of_phandle_args oirq; |
|
|
|
pr_debug("mpic: found U3, guessing msi allocator setup\n"); |
|
|
|
/* Reserve source numbers we know are reserved in the HW. |
|
* |
|
* This is a bit of a mix of U3 and U4 reserves but that's going |
|
* to work fine, we have plenty enugh numbers left so let's just |
|
* mark anything we don't like reserved. |
|
*/ |
|
for (i = 0; i < 8; i++) |
|
msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
|
|
|
for (i = 42; i < 46; i++) |
|
msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
|
|
|
for (i = 100; i < 105; i++) |
|
msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
|
|
|
for (i = 124; i < mpic->num_sources; i++) |
|
msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, i); |
|
|
|
|
|
np = NULL; |
|
while ((np = of_find_all_nodes(np))) { |
|
pr_debug("mpic: mapping hwirqs for %pOF\n", np); |
|
|
|
index = 0; |
|
while (of_irq_parse_one(np, index++, &oirq) == 0) { |
|
ops->xlate(mpic->irqhost, NULL, oirq.args, |
|
oirq.args_count, &hwirq, &flags); |
|
msi_bitmap_reserve_hwirq(&mpic->msi_bitmap, hwirq); |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
#else |
|
static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic) |
|
{ |
|
return -1; |
|
} |
|
#endif |
|
|
|
int mpic_msi_init_allocator(struct mpic *mpic) |
|
{ |
|
int rc; |
|
|
|
rc = msi_bitmap_alloc(&mpic->msi_bitmap, mpic->num_sources, |
|
irq_domain_get_of_node(mpic->irqhost)); |
|
if (rc) |
|
return rc; |
|
|
|
rc = msi_bitmap_reserve_dt_hwirqs(&mpic->msi_bitmap); |
|
if (rc > 0) { |
|
if (mpic->flags & MPIC_U3_HT_IRQS) |
|
rc = mpic_msi_reserve_u3_hwirqs(mpic); |
|
|
|
if (rc) { |
|
msi_bitmap_free(&mpic->msi_bitmap); |
|
return rc; |
|
} |
|
} |
|
|
|
return 0; |
|
}
|
|
|