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/*
* Copyright (C) 2003 PMC-Sierra Inc.
* Author: Manish Lachwani (lachwani@pmc-sierra.com)
*
* Copyright (C) 2006 Ralf Baechle (ralf@linux-mips.org)
*
* 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.
*
* Second level Interrupt handlers for the PMC-Sierra Titan/Yosemite board
*/
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/kernel_stat.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/irq.h>
#include <linux/timex.h>
#include <linux/slab.h>
#include <linux/random.h>
#include <linux/bitops.h>
#include <asm/bootinfo.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/irq_cpu.h>
#include <asm/mipsregs.h>
#include <asm/system.h>
#include <asm/titan_dep.h>
/* Hypertransport specific */
#define IRQ_ACK_BITS 0x00000000 /* Ack bits */
#define HYPERTRANSPORT_INTA 0x78 /* INTA# */
#define HYPERTRANSPORT_INTB 0x79 /* INTB# */
#define HYPERTRANSPORT_INTC 0x7a /* INTC# */
#define HYPERTRANSPORT_INTD 0x7b /* INTD# */
extern void titan_mailbox_irq(void);
/*
* Handle hypertransport & SMP interrupts. The interrupt lines are scarce.
* For interprocessor interrupts, the best thing to do is to use the INTMSG
* register. We use the same external interrupt line, i.e. INTB3 and monitor
* another status bit
*/
static void ll_ht_smp_irq_handler(int irq)
{
u32 status = OCD_READ(RM9000x2_OCD_INTP0STATUS4);
/* Ack all the bits that correspond to the interrupt sources */
if (status != 0)
OCD_WRITE(RM9000x2_OCD_INTP0STATUS4, IRQ_ACK_BITS);
status = OCD_READ(RM9000x2_OCD_INTP1STATUS4);
if (status != 0)
OCD_WRITE(RM9000x2_OCD_INTP1STATUS4, IRQ_ACK_BITS);
#ifdef CONFIG_HT_LEVEL_TRIGGER
/*
* Level Trigger Mode only. Send the HT EOI message back to the source.
*/
switch (status) {
case 0x1000000:
OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTA);
break;
case 0x2000000:
OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTB);
break;
case 0x4000000:
OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTC);
break;
case 0x8000000:
OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTD);
break;
case 0x0000001:
/* PLX */
OCD_WRITE(RM9000x2_OCD_HTEOI, 0x20);
OCD_WRITE(IRQ_CLEAR_REG, IRQ_ACK_BITS);
break;
case 0xf000000:
OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTA);
OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTB);
OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTC);
OCD_WRITE(RM9000x2_OCD_HTEOI, HYPERTRANSPORT_INTD);
break;
}
#endif /* CONFIG_HT_LEVEL_TRIGGER */
do_IRQ(irq);
}
asmlinkage void plat_irq_dispatch(void)
{
unsigned int cause = read_c0_cause();
unsigned int status = read_c0_status();
unsigned int pending = cause & status;
if (pending & STATUSF_IP7) {
do_IRQ(7);
} else if (pending & STATUSF_IP2) {
#ifdef CONFIG_HYPERTRANSPORT
ll_ht_smp_irq_handler(2);
#else
do_IRQ(2);
#endif
} else if (pending & STATUSF_IP3) {
do_IRQ(3);
} else if (pending & STATUSF_IP4) {
do_IRQ(4);
} else if (pending & STATUSF_IP5) {
#ifdef CONFIG_SMP
titan_mailbox_irq();
#else
do_IRQ(5);
#endif
} else if (pending & STATUSF_IP6) {
do_IRQ(4);
}
}
#ifdef CONFIG_KGDB
extern void init_second_port(void);
#endif
/*
* Initialize the next level interrupt handler
*/
void __init arch_init_irq(void)
{
clear_c0_status(ST0_IM);
mips_cpu_irq_init();
rm7k_cpu_irq_init();
rm9k_cpu_irq_init();
#ifdef CONFIG_KGDB
/* At this point, initialize the second serial port */
init_second_port();
#endif
#ifdef CONFIG_GDB_CONSOLE
register_gdb_console();
#endif
}
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