275 lines
7.1 KiB
C
275 lines
7.1 KiB
C
/*
|
|
* Celleb/Beat Interrupt controller
|
|
*
|
|
* (C) Copyright 2006-2007 TOSHIBA 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; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/machdep.h>
|
|
|
|
#include "interrupt.h"
|
|
#include "beat_wrapper.h"
|
|
|
|
#define MAX_IRQS NR_IRQS
|
|
static DEFINE_SPINLOCK(beatic_irq_mask_lock);
|
|
static uint64_t beatic_irq_mask_enable[(MAX_IRQS+255)/64];
|
|
static uint64_t beatic_irq_mask_ack[(MAX_IRQS+255)/64];
|
|
|
|
static struct irq_host *beatic_host = NULL;
|
|
|
|
/*
|
|
* In this implementation, "virq" == "IRQ plug number",
|
|
* "(irq_hw_number_t)hwirq" == "IRQ outlet number".
|
|
*/
|
|
|
|
/* assumption: locked */
|
|
static inline void beatic_update_irq_mask(unsigned int irq_plug)
|
|
{
|
|
int off;
|
|
unsigned long masks[4];
|
|
|
|
off = (irq_plug / 256) * 4;
|
|
masks[0] = beatic_irq_mask_enable[off + 0]
|
|
& beatic_irq_mask_ack[off + 0];
|
|
masks[1] = beatic_irq_mask_enable[off + 1]
|
|
& beatic_irq_mask_ack[off + 1];
|
|
masks[2] = beatic_irq_mask_enable[off + 2]
|
|
& beatic_irq_mask_ack[off + 2];
|
|
masks[3] = beatic_irq_mask_enable[off + 3]
|
|
& beatic_irq_mask_ack[off + 3];
|
|
if (beat_set_interrupt_mask(irq_plug&~255UL,
|
|
masks[0], masks[1], masks[2], masks[3]) != 0)
|
|
panic("Failed to set mask IRQ!");
|
|
}
|
|
|
|
static void beatic_mask_irq(unsigned int irq_plug)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&beatic_irq_mask_lock, flags);
|
|
beatic_irq_mask_enable[irq_plug/64] &= ~(1UL << (63 - (irq_plug%64)));
|
|
beatic_update_irq_mask(irq_plug);
|
|
spin_unlock_irqrestore(&beatic_irq_mask_lock, flags);
|
|
}
|
|
|
|
static void beatic_unmask_irq(unsigned int irq_plug)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&beatic_irq_mask_lock, flags);
|
|
beatic_irq_mask_enable[irq_plug/64] |= 1UL << (63 - (irq_plug%64));
|
|
beatic_update_irq_mask(irq_plug);
|
|
spin_unlock_irqrestore(&beatic_irq_mask_lock, flags);
|
|
}
|
|
|
|
static void beatic_ack_irq(unsigned int irq_plug)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&beatic_irq_mask_lock, flags);
|
|
beatic_irq_mask_ack[irq_plug/64] &= ~(1UL << (63 - (irq_plug%64)));
|
|
beatic_update_irq_mask(irq_plug);
|
|
spin_unlock_irqrestore(&beatic_irq_mask_lock, flags);
|
|
}
|
|
|
|
static void beatic_end_irq(unsigned int irq_plug)
|
|
{
|
|
s64 err;
|
|
unsigned long flags;
|
|
|
|
if ((err = beat_downcount_of_interrupt(irq_plug)) != 0) {
|
|
if ((err & 0xFFFFFFFF) != 0xFFFFFFF5) /* -11: wrong state */
|
|
panic("Failed to downcount IRQ! Error = %16lx", err);
|
|
|
|
printk(KERN_ERR "IRQ over-downcounted, plug %d\n", irq_plug);
|
|
}
|
|
spin_lock_irqsave(&beatic_irq_mask_lock, flags);
|
|
beatic_irq_mask_ack[irq_plug/64] |= 1UL << (63 - (irq_plug%64));
|
|
beatic_update_irq_mask(irq_plug);
|
|
spin_unlock_irqrestore(&beatic_irq_mask_lock, flags);
|
|
}
|
|
|
|
static struct irq_chip beatic_pic = {
|
|
.typename = " CELL-BEAT ",
|
|
.unmask = beatic_unmask_irq,
|
|
.mask = beatic_mask_irq,
|
|
.eoi = beatic_end_irq,
|
|
};
|
|
|
|
/*
|
|
* Dispose binding hardware IRQ number (hw) and Virtuql IRQ number (virq),
|
|
* update flags.
|
|
*
|
|
* Note that the number (virq) is already assigned at upper layer.
|
|
*/
|
|
static void beatic_pic_host_unmap(struct irq_host *h, unsigned int virq)
|
|
{
|
|
beat_destruct_irq_plug(virq);
|
|
}
|
|
|
|
/*
|
|
* Create or update binding hardware IRQ number (hw) and Virtuql
|
|
* IRQ number (virq). This is called only once for a given mapping.
|
|
*
|
|
* Note that the number (virq) is already assigned at upper layer.
|
|
*/
|
|
static int beatic_pic_host_map(struct irq_host *h, unsigned int virq,
|
|
irq_hw_number_t hw)
|
|
{
|
|
struct irq_desc *desc = get_irq_desc(virq);
|
|
int64_t err;
|
|
|
|
if ((err = beat_construct_and_connect_irq_plug(virq, hw)) < 0)
|
|
return -EIO;
|
|
|
|
desc->status |= IRQ_LEVEL;
|
|
set_irq_chip_and_handler(virq, &beatic_pic, handle_fasteoi_irq);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update binding hardware IRQ number (hw) and Virtuql
|
|
* IRQ number (virq). This is called only once for a given mapping.
|
|
*/
|
|
static void beatic_pic_host_remap(struct irq_host *h, unsigned int virq,
|
|
irq_hw_number_t hw)
|
|
{
|
|
beat_construct_and_connect_irq_plug(virq, hw);
|
|
}
|
|
|
|
/*
|
|
* Translate device-tree interrupt spec to irq_hw_number_t style (ulong),
|
|
* to pass away to irq_create_mapping().
|
|
*
|
|
* Called from irq_create_of_mapping() only.
|
|
* Note: We have only 1 entry to translate.
|
|
*/
|
|
static int beatic_pic_host_xlate(struct irq_host *h, struct device_node *ct,
|
|
u32 *intspec, unsigned int intsize,
|
|
irq_hw_number_t *out_hwirq,
|
|
unsigned int *out_flags)
|
|
{
|
|
u64 *intspec2 = (u64 *)intspec;
|
|
|
|
*out_hwirq = *intspec2;
|
|
*out_flags |= IRQ_TYPE_LEVEL_LOW;
|
|
return 0;
|
|
}
|
|
|
|
static struct irq_host_ops beatic_pic_host_ops = {
|
|
.map = beatic_pic_host_map,
|
|
.remap = beatic_pic_host_remap,
|
|
.unmap = beatic_pic_host_unmap,
|
|
.xlate = beatic_pic_host_xlate,
|
|
};
|
|
|
|
/*
|
|
* Get an IRQ number
|
|
* Note: returns VIRQ
|
|
*/
|
|
static inline unsigned int beatic_get_irq_plug(void)
|
|
{
|
|
int i;
|
|
uint64_t pending[4], ub;
|
|
|
|
for (i = 0; i < MAX_IRQS; i += 256) {
|
|
beat_detect_pending_interrupts(i, pending);
|
|
__asm__ ("cntlzd %0,%1":"=r"(ub):
|
|
"r"(pending[0] & beatic_irq_mask_enable[i/64+0]
|
|
& beatic_irq_mask_ack[i/64+0]));
|
|
if (ub != 64)
|
|
return i + ub + 0;
|
|
__asm__ ("cntlzd %0,%1":"=r"(ub):
|
|
"r"(pending[1] & beatic_irq_mask_enable[i/64+1]
|
|
& beatic_irq_mask_ack[i/64+1]));
|
|
if (ub != 64)
|
|
return i + ub + 64;
|
|
__asm__ ("cntlzd %0,%1":"=r"(ub):
|
|
"r"(pending[2] & beatic_irq_mask_enable[i/64+2]
|
|
& beatic_irq_mask_ack[i/64+2]));
|
|
if (ub != 64)
|
|
return i + ub + 128;
|
|
__asm__ ("cntlzd %0,%1":"=r"(ub):
|
|
"r"(pending[3] & beatic_irq_mask_enable[i/64+3]
|
|
& beatic_irq_mask_ack[i/64+3]));
|
|
if (ub != 64)
|
|
return i + ub + 192;
|
|
}
|
|
|
|
return NO_IRQ;
|
|
}
|
|
unsigned int beatic_get_irq(void)
|
|
{
|
|
unsigned int ret;
|
|
|
|
ret = beatic_get_irq_plug();
|
|
if (ret != NO_IRQ)
|
|
beatic_ack_irq(ret);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
*/
|
|
void __init beatic_init_IRQ(void)
|
|
{
|
|
int i;
|
|
|
|
memset(beatic_irq_mask_enable, 0, sizeof(beatic_irq_mask_enable));
|
|
memset(beatic_irq_mask_ack, 255, sizeof(beatic_irq_mask_ack));
|
|
for (i = 0; i < MAX_IRQS; i += 256)
|
|
beat_set_interrupt_mask(i, 0L, 0L, 0L, 0L);
|
|
|
|
/* Set out get_irq function */
|
|
ppc_md.get_irq = beatic_get_irq;
|
|
|
|
/* Allocate an irq host */
|
|
beatic_host = irq_alloc_host(IRQ_HOST_MAP_NOMAP, 0,
|
|
&beatic_pic_host_ops,
|
|
0);
|
|
BUG_ON(beatic_host == NULL);
|
|
irq_set_default_host(beatic_host);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
|
|
/* Nullified to compile with SMP mode */
|
|
void beatic_setup_cpu(int cpu)
|
|
{
|
|
}
|
|
|
|
void beatic_cause_IPI(int cpu, int mesg)
|
|
{
|
|
}
|
|
|
|
void beatic_request_IPIs(void)
|
|
{
|
|
}
|
|
#endif /* CONFIG_SMP */
|
|
|
|
void beatic_deinit_IRQ(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 1; i < NR_IRQS; i++)
|
|
beat_destruct_irq_plug(i);
|
|
}
|