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- /*
- * Copyright (C) 2000,2001,2002,2003,2004 Broadcom 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
- */
- /*
- * bcm1480_irq_handler() is the routine that is actually called when an
- * interrupt occurs. It is installed as the exception vector handler in
- * init_IRQ() in arch/mips/sibyte/bcm1480/irq.c
- *
- * In the handle we figure out which interrupts need handling, and use that
- * to call the dispatcher, which will take care of actually calling
- * registered handlers
- *
- * Note that we take care of all raised interrupts in one go at the handler.
- * This is more BSDish than the Indy code, and also, IMHO, more sane.
- */
- #include <linux/config.h>
- #include <asm/addrspace.h>
- #include <asm/asm.h>
- #include <asm/mipsregs.h>
- #include <asm/regdef.h>
- #include <asm/stackframe.h>
- #include <asm/sibyte/sb1250_defs.h>
- #include <asm/sibyte/bcm1480_regs.h>
- #include <asm/sibyte/bcm1480_int.h>
- /*
- * What a pain. We have to be really careful saving the upper 32 bits of any
- * register across function calls if we don't want them trashed--since were
- * running in -o32, the calling routing never saves the full 64 bits of a
- * register across a function call. Being the interrupt handler, we're
- * guaranteed that interrupts are disabled during this code so we don't have
- * to worry about random interrupts blasting the high 32 bits.
- */
- .text
- .set push
- .set noreorder
- .set noat
- .set mips64
- #.set mips4
- .align 5
- NESTED(bcm1480_irq_handler, PT_SIZE, sp)
- SAVE_ALL
- CLI
- #ifdef CONFIG_SIBYTE_BCM1480_PROF
- /* Set compare to count to silence count/compare timer interrupts */
- mfc0 t1, CP0_COUNT
- mtc0 t1, CP0_COMPARE /* pause to clear IP[7] bit of cause ? */
- #endif
- /* Read cause */
- mfc0 s0, CP0_CAUSE
- #ifdef CONFIG_SIBYTE_BCM1480_PROF
- /* Cpu performance counter interrupt is routed to IP[7] */
- andi t1, s0, CAUSEF_IP7
- beqz t1, 0f
- srl t1, s0, (CAUSEB_BD-2) /* Shift BD bit to bit 2 */
- and t1, t1, 0x4 /* mask to get just BD bit */
- #ifdef CONFIG_MIPS64
- dmfc0 a0, CP0_EPC
- daddu a0, a0, t1 /* a0 = EPC + (BD ? 4 : 0) */
- #else
- mfc0 a0, CP0_EPC
- addu a0, a0, t1 /* a0 = EPC + (BD ? 4 : 0) */
- #endif
- jal sbprof_cpu_intr
- nop
- j ret_from_irq
- nop
- 0:
- #endif
- /* Timer interrupt is routed to IP[4] */
- andi t1, s0, CAUSEF_IP4
- beqz t1, 1f
- nop
- jal bcm1480_timer_interrupt
- move a0, sp /* Pass the registers along */
- j ret_from_irq
- nop /* delay slot */
- 1:
- #ifdef CONFIG_SMP
- /* Mailbox interrupt is routed to IP[3] */
- andi t1, s0, CAUSEF_IP3
- beqz t1, 2f
- nop
- jal bcm1480_mailbox_interrupt
- move a0, sp
- j ret_from_irq
- nop /* delay slot */
- 2:
- #endif
- #ifdef CONFIG_KGDB
- /* KGDB (uart 1) interrupt is routed to IP[6] */
- andi t1, s0, CAUSEF_IP6
- beqz t1, 3f
- nop /* delay slot */
- jal bcm1480_kgdb_interrupt
- move a0, sp
- j ret_from_irq
- nop /* delay slot */
- 3:
- #endif
- and t1, s0, CAUSEF_IP2
- beqz t1, 9f
- nop
- /*
- * Default...we've hit an IP[2] interrupt, which means we've got
- * to check the 1480 interrupt registers to figure out what to do
- * Need to detect which CPU we're on, now that smp_affinity is
- * supported.
- */
- PTR_LA v0, CKSEG1 + A_BCM1480_IMR_CPU0_BASE
- #ifdef CONFIG_SMP
- lw t1, TI_CPU($28)
- sll t1, t1, BCM1480_IMR_REGISTER_SPACING_SHIFT
- addu v0, v0, t1
- #endif
- /* Read IP[2] status (get both high and low halves of status) */
- ld s0, R_BCM1480_IMR_INTERRUPT_STATUS_BASE_H(v0)
- ld s1, R_BCM1480_IMR_INTERRUPT_STATUS_BASE_L(v0)
- move s2, zero /* intr number */
- li s3, 64
- beqz s0, 9f /* No interrupts. Return. */
- move a1, sp
- xori s4, s0, 1 /* if s0 (_H) == 1, it's a low intr, so... */
- movz s2, s3, s4 /* start the intr number at 64, and */
- movz s0, s1, s4 /* look at the low status value. */
- dclz s1, s0 /* Find the next interrupt. */
- dsubu a0, zero, s1
- daddiu a0, a0, 63
- jal do_IRQ
- daddu a0, a0, s2
- 9: j ret_from_irq
- nop
- .set pop
- END(bcm1480_irq_handler)
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