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/*
* Copyright 2001 MontaVista Software Inc.
* Author: MontaVista Software, Inc.
* ahennessy@mvista.com
*
* 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.
*
* Copyright (C) 2000-2001 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/init.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/mipsregs.h>
#include <asm/txx9/generic.h>
#include <asm/txx9/jmr3927.h>
#if JMR3927_IRQ_END > NR_IRQS
#error JMR3927_IRQ_END > NR_IRQS
#endif
/*
* CP0_STATUS is a thread's resource (saved/restored on context switch).
* So disable_irq/enable_irq MUST handle IOC/IRC registers.
*/
static void mask_irq_ioc(struct irq_data *d)
{
/* 0: mask */
unsigned int irq_nr = d->irq - JMR3927_IRQ_IOC;
unsigned char imask = jmr3927_ioc_reg_in(JMR3927_IOC_INTM_ADDR);
unsigned int bit = 1 << irq_nr;
jmr3927_ioc_reg_out(imask & ~bit, JMR3927_IOC_INTM_ADDR);
/* flush write buffer */
(void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
}
static void unmask_irq_ioc(struct irq_data *d)
{
/* 0: mask */
unsigned int irq_nr = d->irq - JMR3927_IRQ_IOC;
unsigned char imask = jmr3927_ioc_reg_in(JMR3927_IOC_INTM_ADDR);
unsigned int bit = 1 << irq_nr;
jmr3927_ioc_reg_out(imask | bit, JMR3927_IOC_INTM_ADDR);
/* flush write buffer */
(void)jmr3927_ioc_reg_in(JMR3927_IOC_REV_ADDR);
}
static int jmr3927_ioc_irqroute(void)
{
unsigned char istat = jmr3927_ioc_reg_in(JMR3927_IOC_INTS2_ADDR);
int i;
for (i = 0; i < JMR3927_NR_IRQ_IOC; i++) {
if (istat & (1 << i))
return JMR3927_IRQ_IOC + i;
}
return -1;
}
static int jmr3927_irq_dispatch(int pending)
{
int irq;
if ((pending & CAUSEF_IP7) == 0)
return -1;
irq = (pending >> CAUSEB_IP2) & 0x0f;
irq += JMR3927_IRQ_IRC;
if (irq == JMR3927_IRQ_IOCINT)
irq = jmr3927_ioc_irqroute();
return irq;
}
static struct irq_chip jmr3927_irq_ioc = {
.name = "jmr3927_ioc",
.irq_mask = mask_irq_ioc,
.irq_unmask = unmask_irq_ioc,
};
void __init jmr3927_irq_setup(void)
{
int i;
txx9_irq_dispatch = jmr3927_irq_dispatch;
/* Now, interrupt control disabled, */
/* all IRC interrupts are masked, */
/* all IRC interrupt mode are Low Active. */
/* mask all IOC interrupts */
jmr3927_ioc_reg_out(0, JMR3927_IOC_INTM_ADDR);
/* setup IOC interrupt mode (SOFT:High Active, Others:Low Active) */
jmr3927_ioc_reg_out(JMR3927_IOC_INTF_SOFT, JMR3927_IOC_INTP_ADDR);
/* clear PCI Soft interrupts */
jmr3927_ioc_reg_out(0, JMR3927_IOC_INTS1_ADDR);
/* clear PCI Reset interrupts */
jmr3927_ioc_reg_out(0, JMR3927_IOC_RESET_ADDR);
tx3927_irq_init();
for (i = JMR3927_IRQ_IOC; i < JMR3927_IRQ_IOC + JMR3927_NR_IRQ_IOC; i++)
irq_set_chip_and_handler(i, &jmr3927_irq_ioc,
handle_level_irq);
/* setup IOC interrupt 1 (PCI, MODEM) */
irq_set_chained_handler(JMR3927_IRQ_IOCINT, handle_simple_irq);
}
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