diff options
Diffstat (limited to 'arch/mips/pmc-sierra/yosemite/irq.c')
| -rw-r--r-- | arch/mips/pmc-sierra/yosemite/irq.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/arch/mips/pmc-sierra/yosemite/irq.c b/arch/mips/pmc-sierra/yosemite/irq.c new file mode 100644 index 000000000000..f4e2897d9bf7 --- /dev/null +++ b/arch/mips/pmc-sierra/yosemite/irq.c @@ -0,0 +1,167 @@ +/* + * Copyright (C) 2003 PMC-Sierra Inc. + * Author: Manish Lachwani (lachwani@pmc-sierra.com) + * + * 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/config.h> +#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 asmlinkage void titan_handle_int(void); +extern void jaguar_mailbox_irq(struct pt_regs *); + +/* + * 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 + */ +asmlinkage void ll_ht_smp_irq_handler(int irq, struct pt_regs *regs) +{ + 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, regs); +} + +asmlinkage void do_extended_irq(struct pt_regs *regs) +{ + unsigned int intcontrol = read_c0_intcontrol(); + unsigned int cause = read_c0_cause(); + unsigned int status = read_c0_status(); + unsigned int pending_sr, pending_ic; + + pending_sr = status & cause & 0xff00; + pending_ic = (cause >> 8) & intcontrol & 0xff00; + + if (pending_ic & (1 << 13)) + do_IRQ(13, regs); + +} + +#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); + + set_except_vector(0, titan_handle_int); + mips_cpu_irq_init(0); + rm7k_cpu_irq_init(8); + rm9k_cpu_irq_init(12); + +#ifdef CONFIG_KGDB + /* At this point, initialize the second serial port */ + init_second_port(); +#endif + +#ifdef CONFIG_GDB_CONSOLE + register_gdb_console(); +#endif +} + +#ifdef CONFIG_KGDB +/* + * The 16550 DUART has two ports, but is allocated one IRQ + * for the serial console. Hence, a generic framework for + * serial IRQ routing in place. Currently, just calls the + * do_IRQ fuction. But, going in the future, need to check + * DUART registers for channel A and B, then decide the + * appropriate action + */ +asmlinkage void yosemite_kgdb_irq(int irq, struct pt_regs *regs) +{ + do_IRQ(irq, regs); +} +#endif |