Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 | /*
* Copyright 2006-2007, Michael Ellerman, IBM Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; version 2 of the
* License.
*
*/
#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 <sysdev/mpic.h>
static void __mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
{
pr_debug("mpic: reserving hwirq 0x%lx\n", hwirq);
bitmap_allocate_region(mpic->hwirq_bitmap, hwirq, 0);
}
void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq)
{
unsigned long flags;
/* The mpic calls this even when there is no allocator setup */
if (!mpic->hwirq_bitmap)
return;
spin_lock_irqsave(&mpic->bitmap_lock, flags);
__mpic_msi_reserve_hwirq(mpic, hwirq);
spin_unlock_irqrestore(&mpic->bitmap_lock, flags);
}
irq_hw_number_t mpic_msi_alloc_hwirqs(struct mpic *mpic, int num)
{
unsigned long flags;
int offset, order = get_count_order(num);
spin_lock_irqsave(&mpic->bitmap_lock, flags);
/*
* This is fast, but stricter than we need. We might want to add
* a fallback routine which does a linear search with no alignment.
*/
offset = bitmap_find_free_region(mpic->hwirq_bitmap, mpic->irq_count,
order);
spin_unlock_irqrestore(&mpic->bitmap_lock, flags);
pr_debug("mpic: allocated 0x%x (2^%d) at offset 0x%x\n",
num, order, offset);
return offset;
}
void mpic_msi_free_hwirqs(struct mpic *mpic, int offset, int num)
{
unsigned long flags;
int order = get_count_order(num);
pr_debug("mpic: freeing 0x%x (2^%d) at offset 0x%x\n",
num, order, offset);
spin_lock_irqsave(&mpic->bitmap_lock, flags);
bitmap_release_region(mpic->hwirq_bitmap, offset, order);
spin_unlock_irqrestore(&mpic->bitmap_lock, flags);
}
#ifdef CONFIG_MPIC_U3_HT_IRQS
static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
{
irq_hw_number_t hwirq;
struct irq_host_ops *ops = mpic->irqhost->ops;
struct device_node *np;
int flags, index, i;
struct of_irq oirq;
pr_debug("mpic: found U3, guessing msi allocator setup\n");
/* Reserve source numbers we know are reserved in the HW */
for (i = 0; i < 8; i++)
__mpic_msi_reserve_hwirq(mpic, i);
for (i = 42; i < 46; i++)
__mpic_msi_reserve_hwirq(mpic, i);
for (i = 100; i < 105; i++)
__mpic_msi_reserve_hwirq(mpic, i);
np = NULL;
while ((np = of_find_all_nodes(np))) {
pr_debug("mpic: mapping hwirqs for %s\n", np->full_name);
index = 0;
while (of_irq_map_one(np, index++, &oirq) == 0) {
ops->xlate(mpic->irqhost, NULL, oirq.specifier,
oirq.size, &hwirq, &flags);
__mpic_msi_reserve_hwirq(mpic, hwirq);
}
}
return 0;
}
#else
static int mpic_msi_reserve_u3_hwirqs(struct mpic *mpic)
{
return -1;
}
#endif
static int mpic_msi_reserve_dt_hwirqs(struct mpic *mpic)
{
int i, len;
const u32 *p;
p = of_get_property(mpic->irqhost->of_node,
"msi-available-ranges", &len);
if (!p) {
pr_debug("mpic: no msi-available-ranges property found on %s\n",
mpic->irqhost->of_node->full_name);
return -ENODEV;
}
if (len % 8 != 0) {
printk(KERN_WARNING "mpic: Malformed msi-available-ranges "
"property on %s\n", mpic->irqhost->of_node->full_name);
return -EINVAL;
}
bitmap_allocate_region(mpic->hwirq_bitmap, 0,
get_count_order(mpic->irq_count));
/* Format is: (<u32 start> <u32 count>)+ */
len /= sizeof(u32);
for (i = 0; i < len / 2; i++, p += 2)
mpic_msi_free_hwirqs(mpic, *p, *(p + 1));
return 0;
}
int mpic_msi_init_allocator(struct mpic *mpic)
{
int rc, size;
BUG_ON(mpic->hwirq_bitmap);
spin_lock_init(&mpic->bitmap_lock);
size = BITS_TO_LONGS(mpic->irq_count) * sizeof(long);
pr_debug("mpic: allocator bitmap size is 0x%x bytes\n", size);
mpic->hwirq_bitmap = alloc_maybe_bootmem(size, GFP_KERNEL);
if (!mpic->hwirq_bitmap) {
pr_debug("mpic: ENOMEM allocating allocator bitmap!\n");
return -ENOMEM;
}
memset(mpic->hwirq_bitmap, 0, size);
rc = mpic_msi_reserve_dt_hwirqs(mpic);
if (rc) {
if (mpic->flags & MPIC_U3_HT_IRQS)
rc = mpic_msi_reserve_u3_hwirqs(mpic);
if (rc)
goto out_free;
}
return 0;
out_free:
if (mem_init_done)
kfree(mpic->hwirq_bitmap);
mpic->hwirq_bitmap = NULL;
return rc;
}
|