balancing.c
2.27 KB
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/*
* Support for hardware-managed IRQ auto-distribution.
*
* Copyright (C) 2010 Paul Mundt
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include "internals.h"
static unsigned long dist_handle[INTC_NR_IRQS];
void intc_balancing_enable(unsigned int irq)
{
struct intc_desc_int *d = get_intc_desc(irq);
unsigned long handle = dist_handle[irq];
unsigned long addr;
if (irq_balancing_disabled(irq) || !handle)
return;
addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);
intc_reg_fns[_INTC_FN(handle)](addr, handle, 1);
}
void intc_balancing_disable(unsigned int irq)
{
struct intc_desc_int *d = get_intc_desc(irq);
unsigned long handle = dist_handle[irq];
unsigned long addr;
if (irq_balancing_disabled(irq) || !handle)
return;
addr = INTC_REG(d, _INTC_ADDR_D(handle), 0);
intc_reg_fns[_INTC_FN(handle)](addr, handle, 0);
}
static unsigned int intc_dist_data(struct intc_desc *desc,
struct intc_desc_int *d,
intc_enum enum_id)
{
struct intc_mask_reg *mr = desc->hw.mask_regs;
unsigned int i, j, fn, mode;
unsigned long reg_e, reg_d;
for (i = 0; mr && enum_id && i < desc->hw.nr_mask_regs; i++) {
mr = desc->hw.mask_regs + i;
/*
* Skip this entry if there's no auto-distribution
* register associated with it.
*/
if (!mr->dist_reg)
continue;
for (j = 0; j < ARRAY_SIZE(mr->enum_ids); j++) {
if (mr->enum_ids[j] != enum_id)
continue;
fn = REG_FN_MODIFY_BASE;
mode = MODE_ENABLE_REG;
reg_e = mr->dist_reg;
reg_d = mr->dist_reg;
fn += (mr->reg_width >> 3) - 1;
return _INTC_MK(fn, mode,
intc_get_reg(d, reg_e),
intc_get_reg(d, reg_d),
1,
(mr->reg_width - 1) - j);
}
}
/*
* It's possible we've gotten here with no distribution options
* available for the IRQ in question, so we just skip over those.
*/
return 0;
}
void intc_set_dist_handle(unsigned int irq, struct intc_desc *desc,
struct intc_desc_int *d, intc_enum id)
{
unsigned long flags;
/*
* Nothing to do for this IRQ.
*/
if (!desc->hw.mask_regs)
return;
raw_spin_lock_irqsave(&intc_big_lock, flags);
dist_handle[irq] = intc_dist_data(desc, d, id);
raw_spin_unlock_irqrestore(&intc_big_lock, flags);
}