diff options
Diffstat (limited to 'arch/mips/gt64120/ev64120/irq.c')
| -rw-r--r-- | arch/mips/gt64120/ev64120/irq.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/arch/mips/gt64120/ev64120/irq.c b/arch/mips/gt64120/ev64120/irq.c new file mode 100644 index 000000000000..3b186159b21a --- /dev/null +++ b/arch/mips/gt64120/ev64120/irq.c @@ -0,0 +1,145 @@ +/* + * BRIEF MODULE DESCRIPTION + * Code to handle irqs on GT64120A boards + * Derived from mips/orion and Cort <cort@fsmlabs.com> + * + * Copyright (C) 2000 RidgeRun, Inc. + * Author: RidgeRun, Inc. + * glonnon@ridgerun.com, skranz@ridgerun.com, stevej@ridgerun.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. + */ +#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/timex.h> +#include <linux/slab.h> +#include <linux/random.h> +#include <linux/bitops.h> +#include <asm/bootinfo.h> +#include <asm/io.h> +#include <asm/mipsregs.h> +#include <asm/system.h> +#include <asm/gt64120.h> + +asmlinkage inline void pci_intA(struct pt_regs *regs) +{ + do_IRQ(GT_INTA, regs); +} + +asmlinkage inline void pci_intD(struct pt_regs *regs) +{ + do_IRQ(GT_INTD, regs); +} + +static void disable_ev64120_irq(unsigned int irq_nr) +{ + unsigned long flags; + + local_irq_save(flags); + if (irq_nr >= 8) { // All PCI interrupts are on line 5 or 2 + clear_c0_status(9 << 10); + } else { + clear_c0_status(1 << (irq_nr + 8)); + } + local_irq_restore(flags); +} + +static void enable_ev64120_irq(unsigned int irq_nr) +{ + unsigned long flags; + + local_irq_save(flags); + if (irq_nr >= 8) // All PCI interrupts are on line 5 or 2 + set_c0_status(9 << 10); + else + set_c0_status(1 << (irq_nr + 8)); + local_irq_restore(flags); +} + +static unsigned int startup_ev64120_irq(unsigned int irq) +{ + enable_ev64120_irq(irq); + return 0; /* Never anything pending */ +} + +#define shutdown_ev64120_irq disable_ev64120_irq +#define mask_and_ack_ev64120_irq disable_ev64120_irq + +static void end_ev64120_irq(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) + enable_ev64120_irq(irq); +} + +static struct hw_interrupt_type ev64120_irq_type = { + .typename = "EV64120", + .startup = startup_ev64120_irq, + .shutdown = shutdown_ev64120_irq, + .enable = enable_ev64120_irq, + .disable = disable_ev64120_irq, + .ack = mask_and_ack_ev64120_irq, + .end = end_ev64120_irq, + .set_affinity = NULL +}; + +void gt64120_irq_setup(void) +{ + extern asmlinkage void galileo_handle_int(void); + + /* + * Clear all of the interrupts while we change the able around a bit. + */ + clear_c0_status(ST0_IM); + + /* Sets the exception_handler array. */ + set_except_vector(0, galileo_handle_int); + + local_irq_disable(); + + /* + * Enable timer. Other interrupts will be enabled as they are + * registered. + */ + set_c0_status(IE_IRQ2); +} + +void __init arch_init_irq(void) +{ + int i; + + /* Let's initialize our IRQ descriptors */ + for (i = 0; i < NR_IRQS; i++) { + irq_desc[i].status = 0; + irq_desc[i].handler = &no_irq_type; + irq_desc[i].action = NULL; + irq_desc[i].depth = 0; + spin_lock_init(&irq_desc[i].lock); + } + + gt64120_irq_setup(); +} |