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149 lines
3.9 KiB
149 lines
3.9 KiB
/* |
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* This file is subject to the terms and conditions of the GNU General Public |
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* License. See the file "COPYING" in the main directory of this archive |
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* for more details. |
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* |
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* Copyright (C) 1992 Linus Torvalds |
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* Copyright (C) 1994 - 2001, 2003, 07 Ralf Baechle |
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*/ |
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#include <linux/clockchips.h> |
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#include <linux/i8253.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/kernel.h> |
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#include <linux/smp.h> |
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#include <linux/spinlock.h> |
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#include <linux/irq.h> |
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#include <linux/pgtable.h> |
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#include <asm/irq_cpu.h> |
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#include <asm/i8259.h> |
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#include <asm/io.h> |
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#include <asm/jazz.h> |
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#include <asm/tlbmisc.h> |
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static DEFINE_RAW_SPINLOCK(r4030_lock); |
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static void enable_r4030_irq(struct irq_data *d) |
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{ |
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unsigned int mask = 1 << (d->irq - JAZZ_IRQ_START); |
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unsigned long flags; |
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raw_spin_lock_irqsave(&r4030_lock, flags); |
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mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); |
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); |
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raw_spin_unlock_irqrestore(&r4030_lock, flags); |
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} |
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void disable_r4030_irq(struct irq_data *d) |
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{ |
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unsigned int mask = ~(1 << (d->irq - JAZZ_IRQ_START)); |
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unsigned long flags; |
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raw_spin_lock_irqsave(&r4030_lock, flags); |
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mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); |
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); |
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raw_spin_unlock_irqrestore(&r4030_lock, flags); |
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} |
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static struct irq_chip r4030_irq_type = { |
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.name = "R4030", |
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.irq_mask = disable_r4030_irq, |
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.irq_unmask = enable_r4030_irq, |
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}; |
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void __init init_r4030_ints(void) |
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{ |
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int i; |
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for (i = JAZZ_IRQ_START; i <= JAZZ_IRQ_END; i++) |
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irq_set_chip_and_handler(i, &r4030_irq_type, handle_level_irq); |
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r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0); |
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r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */ |
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r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */ |
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} |
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/* |
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* On systems with i8259-style interrupt controllers we assume for |
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* driver compatibility reasons interrupts 0 - 15 to be the i8259 |
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* interrupts even if the hardware uses a different interrupt numbering. |
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*/ |
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void __init arch_init_irq(void) |
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{ |
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/* |
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* this is a hack to get back the still needed wired mapping |
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* killed by init_mm() |
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*/ |
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/* Map 0xe0000000 -> 0x0:800005C0, 0xe0010000 -> 0x1:30000580 */ |
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add_wired_entry(0x02000017, 0x03c00017, 0xe0000000, PM_64K); |
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/* Map 0xe2000000 -> 0x0:900005C0, 0xe3010000 -> 0x0:910005C0 */ |
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add_wired_entry(0x02400017, 0x02440017, 0xe2000000, PM_16M); |
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/* Map 0xe4000000 -> 0x0:600005C0, 0xe4100000 -> 400005C0 */ |
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add_wired_entry(0x01800017, 0x01000017, 0xe4000000, PM_4M); |
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init_i8259_irqs(); /* Integrated i8259 */ |
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mips_cpu_irq_init(); |
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init_r4030_ints(); |
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change_c0_status(ST0_IM, IE_IRQ2 | IE_IRQ1); |
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} |
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asmlinkage void plat_irq_dispatch(void) |
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{ |
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unsigned int pending = read_c0_cause() & read_c0_status(); |
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unsigned int irq; |
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if (pending & IE_IRQ4) { |
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r4030_read_reg32(JAZZ_TIMER_REGISTER); |
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do_IRQ(JAZZ_TIMER_IRQ); |
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} else if (pending & IE_IRQ2) { |
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irq = *(volatile u8 *)JAZZ_EISA_IRQ_ACK; |
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do_IRQ(irq); |
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} else if (pending & IE_IRQ1) { |
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irq = *(volatile u8 *)JAZZ_IO_IRQ_SOURCE >> 2; |
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if (likely(irq > 0)) |
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do_IRQ(irq + JAZZ_IRQ_START - 1); |
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else |
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panic("Unimplemented loc_no_irq handler"); |
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} |
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} |
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struct clock_event_device r4030_clockevent = { |
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.name = "r4030", |
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.features = CLOCK_EVT_FEAT_PERIODIC, |
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.rating = 300, |
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.irq = JAZZ_TIMER_IRQ, |
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}; |
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static irqreturn_t r4030_timer_interrupt(int irq, void *dev_id) |
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{ |
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struct clock_event_device *cd = dev_id; |
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cd->event_handler(cd); |
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return IRQ_HANDLED; |
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} |
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void __init plat_time_init(void) |
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{ |
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struct clock_event_device *cd = &r4030_clockevent; |
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unsigned int cpu = smp_processor_id(); |
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BUG_ON(HZ != 100); |
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cd->cpumask = cpumask_of(cpu); |
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clockevents_register_device(cd); |
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if (request_irq(JAZZ_TIMER_IRQ, r4030_timer_interrupt, IRQF_TIMER, |
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"R4030 timer", cd)) |
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pr_err("Failed to register R4030 timer interrupt\n"); |
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/* |
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* Set clock to 100Hz. |
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* |
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* The R4030 timer receives an input clock of 1kHz which is divieded by |
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* a programmable 4-bit divider. This makes it fairly inflexible. |
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*/ |
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r4030_write_reg32(JAZZ_TIMER_INTERVAL, 9); |
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setup_pit_timer(); |
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}
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