/* * 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, 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> static DEFINE_RAW_SPINLOCK(r4030_lock); static void enable_r4030_irq(struct irq_data *d) { unsigned int mask = 1 << (d->irq - JAZZ_IRQ_START); unsigned long flags; raw_spin_lock_irqsave(&r4030_lock, flags); mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); raw_spin_unlock_irqrestore(&r4030_lock, flags); } void disable_r4030_irq(struct irq_data *d) { unsigned int mask = ~(1 << (d->irq - JAZZ_IRQ_START)); unsigned long flags; raw_spin_lock_irqsave(&r4030_lock, flags); mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); raw_spin_unlock_irqrestore(&r4030_lock, flags); } 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_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 */ 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) { /* * 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_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"); } } struct clock_event_device r4030_clockevent = { .name = "r4030", .features = CLOCK_EVT_FEAT_PERIODIC, .rating = 300, .irq = JAZZ_TIMER_IRQ, }; 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(); }