diff options
Diffstat (limited to 'arch/mips/jazz/irq.c')
| -rw-r--r-- | arch/mips/jazz/irq.c | 151 |
1 files changed, 107 insertions, 44 deletions
diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c index b309b1bcf2e..e1ea4f625f7 100644 --- a/arch/mips/jazz/irq.c +++ b/arch/mips/jazz/irq.c @@ -4,79 +4,60 @@ * for more details. * * Copyright (C) 1992 Linus Torvalds - * Copyright (C) 1994 - 2001, 2003 Ralf Baechle + * Copyright (C) 1994 - 2001, 2003, 07 Ralf Baechle */ +#include <linux/clockchips.h> +#include <linux/i8253.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel.h> +#include <linux/smp.h> #include <linux/spinlock.h> +#include <linux/irq.h> +#include <asm/irq_cpu.h> #include <asm/i8259.h> #include <asm/io.h> #include <asm/jazz.h> +#include <asm/pgtable.h> +#include <asm/tlbmisc.h> -extern asmlinkage void jazz_handle_int(void); +static DEFINE_RAW_SPINLOCK(r4030_lock); -static DEFINE_SPINLOCK(r4030_lock); - -static void enable_r4030_irq(unsigned int irq) +static void enable_r4030_irq(struct irq_data *d) { - unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ); + unsigned int mask = 1 << (d->irq - JAZZ_IRQ_START); unsigned long flags; - spin_lock_irqsave(&r4030_lock, flags); + raw_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); + raw_spin_unlock_irqrestore(&r4030_lock, flags); } -static unsigned int startup_r4030_irq(unsigned int irq) +void disable_r4030_irq(struct irq_data *d) { - 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 int mask = ~(1 << (d->irq - JAZZ_IRQ_START)); unsigned long flags; - spin_lock_irqsave(&r4030_lock, flags); + raw_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); + raw_spin_unlock_irqrestore(&r4030_lock, flags); } -static struct hw_interrupt_type r4030_irq_type = { - .typename = "R4030", - .startup = startup_r4030_irq, - .shutdown = shutdown_r4030_irq, - .enable = enable_r4030_irq, - .disable = disable_r4030_irq, - .ack = mask_and_ack_r4030_irq, - .end = end_r4030_irq, +static struct irq_chip r4030_irq_type = { + .name = "R4030", + .irq_mask = disable_r4030_irq, + .irq_unmask = enable_r4030_irq, }; 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; - } + for (i = JAZZ_IRQ_START; i <= JAZZ_IRQ_END; i++) + irq_set_chip_and_handler(i, &r4030_irq_type, handle_level_irq); r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0); r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */ @@ -90,10 +71,92 @@ void __init init_r4030_ints(void) */ void __init arch_init_irq(void) { - set_except_vector(0, jazz_handle_int); + /* + * this is a hack to get back the still needed wired mapping + * killed by init_mm() + */ + + /* Map 0xe0000000 -> 0x0:800005C0, 0xe0010000 -> 0x1:30000580 */ + add_wired_entry(0x02000017, 0x03c00017, 0xe0000000, PM_64K); + /* Map 0xe2000000 -> 0x0:900005C0, 0xe3010000 -> 0x0:910005C0 */ + add_wired_entry(0x02400017, 0x02440017, 0xe2000000, PM_16M); + /* Map 0xe4000000 -> 0x0:600005C0, 0xe4100000 -> 400005C0 */ + add_wired_entry(0x01800017, 0x01000017, 0xe4000000, PM_4M); init_i8259_irqs(); /* Integrated i8259 */ + mips_cpu_irq_init(); init_r4030_ints(); - change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1); + change_c0_status(ST0_IM, IE_IRQ2 | IE_IRQ1); +} + +asmlinkage void plat_irq_dispatch(void) +{ + unsigned int pending = read_c0_cause() & read_c0_status(); + unsigned int irq; + + if (pending & IE_IRQ4) { + r4030_read_reg32(JAZZ_TIMER_REGISTER); + do_IRQ(JAZZ_TIMER_IRQ); + } else if (pending & IE_IRQ2) { + irq = *(volatile u8 *)JAZZ_EISA_IRQ_ACK; + do_IRQ(irq); + } else if (pending & IE_IRQ1) { + irq = *(volatile u8 *)JAZZ_IO_IRQ_SOURCE >> 2; + if (likely(irq > 0)) + do_IRQ(irq + JAZZ_IRQ_START - 1); + else + panic("Unimplemented loc_no_irq handler"); + } +} + +static void r4030_set_mode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ + /* Nothing to do ... */ +} + +struct clock_event_device r4030_clockevent = { + .name = "r4030", + .features = CLOCK_EVT_FEAT_PERIODIC, + .rating = 300, + .irq = JAZZ_TIMER_IRQ, + .set_mode = r4030_set_mode, +}; + +static irqreturn_t r4030_timer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *cd = dev_id; + + cd->event_handler(cd); + return IRQ_HANDLED; +} + +static struct irqaction r4030_timer_irqaction = { + .handler = r4030_timer_interrupt, + .flags = IRQF_TIMER, + .name = "R4030 timer", +}; + +void __init plat_time_init(void) +{ + struct clock_event_device *cd = &r4030_clockevent; + struct irqaction *action = &r4030_timer_irqaction; + unsigned int cpu = smp_processor_id(); + + BUG_ON(HZ != 100); + + cd->cpumask = cpumask_of(cpu); + clockevents_register_device(cd); + action->dev_id = cd; + setup_irq(JAZZ_TIMER_IRQ, action); + + /* + * Set clock to 100Hz. + * + * The R4030 timer receives an input clock of 1kHz which is divieded by + * a programmable 4-bit divider. This makes it fairly inflexible. + */ + r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9); + setup_pit_timer(); } |