From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- arch/mips/jazz/irq.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 arch/mips/jazz/irq.c (limited to 'arch/mips/jazz/irq.c') diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c new file mode 100644 index 00000000000..0b608fa98d5 --- /dev/null +++ b/arch/mips/jazz/irq.c @@ -0,0 +1,100 @@ +/* + * 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) 1992 Linus Torvalds + * Copyright (C) 1994 - 2001, 2003 Ralf Baechle + */ +#include +#include +#include +#include + +#include +#include +#include + +extern asmlinkage void jazz_handle_int(void); + +static DEFINE_SPINLOCK(r4030_lock); + +static void enable_r4030_irq(unsigned int irq) +{ + unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ); + unsigned long flags; + + spin_lock_irqsave(&r4030_lock, flags); + mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); + r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); + spin_unlock_irqrestore(&r4030_lock, flags); +} + +static unsigned int startup_r4030_irq(unsigned int irq) +{ + enable_r4030_irq(irq); + return 0; /* never anything pending */ +} + +#define shutdown_r4030_irq disable_r4030_irq + +void disable_r4030_irq(unsigned int irq) +{ + unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ)); + unsigned long flags; + + spin_lock_irqsave(&r4030_lock, flags); + mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); + r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); + spin_unlock_irqrestore(&r4030_lock, flags); +} + +#define mask_and_ack_r4030_irq disable_r4030_irq + +static void end_r4030_irq(unsigned int irq) +{ + if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) + enable_r4030_irq(irq); +} + +static struct hw_interrupt_type r4030_irq_type = { + "R4030", + startup_r4030_irq, + shutdown_r4030_irq, + enable_r4030_irq, + disable_r4030_irq, + mask_and_ack_r4030_irq, + end_r4030_irq, + NULL +}; + +void __init init_r4030_ints(void) +{ + int i; + + for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++) { + irq_desc[i].status = IRQ_DISABLED; + irq_desc[i].action = 0; + irq_desc[i].depth = 1; + irq_desc[i].handler = &r4030_irq_type; + } + + r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0); + r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */ + r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */ +} + +/* + * On systems with i8259-style interrupt controllers we assume for + * driver compatibility reasons interrupts 0 - 15 to be the i8259 + * interrupts even if the hardware uses a different interrupt numbering. + */ +void __init arch_init_irq(void) +{ + set_except_vector(0, jazz_handle_int); + + init_i8259_irqs(); /* Integrated i8259 */ + init_r4030_ints(); + + change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1); +} -- cgit v1.2.3