diff options
Diffstat (limited to 'arch/mips/jazz/irq.c')
| -rw-r--r-- | arch/mips/jazz/irq.c | 142 |
1 files changed, 75 insertions, 67 deletions
diff --git a/arch/mips/jazz/irq.c b/arch/mips/jazz/irq.c index 015cf4bb51dd..835b056cea36 100644 --- a/arch/mips/jazz/irq.c +++ b/arch/mips/jazz/irq.c @@ -6,20 +6,23 @@ * Copyright (C) 1992 Linus Torvalds * Copyright (C) 1994 - 2001, 2003 Ralf Baechle */ +#include <linux/clockchips.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/spinlock.h> +#include <asm/irq_cpu.h> #include <asm/i8259.h> #include <asm/io.h> #include <asm/jazz.h> +#include <asm/pgtable.h> static DEFINE_SPINLOCK(r4030_lock); static void enable_r4030_irq(unsigned int irq) { - unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ); + unsigned int mask = 1 << (irq - JAZZ_IRQ_START); unsigned long flags; spin_lock_irqsave(&r4030_lock, flags); @@ -30,7 +33,7 @@ static void enable_r4030_irq(unsigned int irq) void disable_r4030_irq(unsigned int irq) { - unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ)); + unsigned int mask = ~(1 << (irq - JAZZ_IRQ_START)); unsigned long flags; spin_lock_irqsave(&r4030_lock, flags); @@ -51,7 +54,7 @@ void __init init_r4030_ints(void) { int i; - for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++) + for (i = JAZZ_IRQ_START; i <= JAZZ_IRQ_END; i++) set_irq_chip_and_handler(i, &r4030_irq_type, handle_level_irq); r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0); @@ -66,82 +69,87 @@ void __init init_r4030_ints(void) */ void __init arch_init_irq(void) { + /* + * 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); -} - -static void loc_call(unsigned int irq, unsigned int mask) -{ - r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, - r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) & mask); - do_IRQ(irq); - r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, - r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) | mask); -} - -static void ll_local_dev(void) -{ - switch (r4030_read_reg32(JAZZ_IO_IRQ_SOURCE)) { - case 0: - panic("Unimplemented loc_no_irq handler"); - break; - case 4: - loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_PARALLEL); - break; - case 8: - loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_FLOPPY); - break; - case 12: - panic("Unimplemented loc_sound handler"); - break; - case 16: - panic("Unimplemented loc_video handler"); - break; - case 20: - loc_call(JAZZ_ETHERNET_IRQ, JAZZ_IE_ETHERNET); - break; - case 24: - loc_call(JAZZ_SCSI_IRQ, JAZZ_IE_SCSI); - break; - case 28: - loc_call(JAZZ_KEYBOARD_IRQ, JAZZ_IE_KEYBOARD); - break; - case 32: - loc_call(JAZZ_MOUSE_IRQ, JAZZ_IE_MOUSE); - break; - case 36: - loc_call(JAZZ_SERIAL1_IRQ, JAZZ_IE_SERIAL1); - break; - case 40: - loc_call(JAZZ_SERIAL2_IRQ, JAZZ_IE_SERIAL2); - break; - } + 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_IRQ5) - write_c0_compare(0); - else if (pending & IE_IRQ4) { + if (pending & IE_IRQ4) { r4030_read_reg32(JAZZ_TIMER_REGISTER); do_IRQ(JAZZ_TIMER_IRQ); - } else if (pending & IE_IRQ3) - panic("Unimplemented ISA NMI handler"); - else if (pending & IE_IRQ2) + } else if (pending & IE_IRQ2) do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK)); else if (pending & IE_IRQ1) { - ll_local_dev(); - } else if (unlikely(pending & IE_IRQ0)) - panic("Unimplemented local_dma handler"); - else if (pending & IE_SW1) { - clear_c0_cause(IE_SW1); - panic("Unimplemented sw1 handler"); - } else if (pending & IE_SW0) { - clear_c0_cause(IE_SW0); - panic("Unimplemented sw0 handler"); + 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 = 100, + .irq = JAZZ_TIMER_IRQ, + .cpumask = CPU_MASK_CPU0, + .set_mode = r4030_set_mode, +}; + +static irqreturn_t r4030_timer_interrupt(int irq, void *dev_id) +{ + r4030_clockevent.event_handler(&r4030_clockevent); + + return IRQ_HANDLED; +} + +static struct irqaction r4030_timer_irqaction = { + .handler = r4030_timer_interrupt, + .flags = IRQF_DISABLED, + .mask = CPU_MASK_CPU0, + .name = "timer", +}; + +void __init plat_timer_setup(struct irqaction *ignored) +{ + struct irqaction *irq = &r4030_timer_irqaction; + + BUG_ON(HZ != 100); + + /* + * 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_irq(JAZZ_TIMER_IRQ, irq); + + clockevents_register_device(&r4030_clockevent); +} |