11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * This file is subject to the terms and conditions of the GNU General Public 31da177e4SLinus Torvalds * License. See the file "COPYING" in the main directory of this archive 41da177e4SLinus Torvalds * for more details. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Copyright (C) 1992 Linus Torvalds 71da177e4SLinus Torvalds * Copyright (C) 1994 - 2001, 2003 Ralf Baechle 81da177e4SLinus Torvalds */ 91da177e4SLinus Torvalds #include <linux/init.h> 101da177e4SLinus Torvalds #include <linux/interrupt.h> 111da177e4SLinus Torvalds #include <linux/kernel.h> 121da177e4SLinus Torvalds #include <linux/spinlock.h> 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds #include <asm/i8259.h> 151da177e4SLinus Torvalds #include <asm/io.h> 161da177e4SLinus Torvalds #include <asm/jazz.h> 171da177e4SLinus Torvalds 181da177e4SLinus Torvalds extern asmlinkage void jazz_handle_int(void); 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds static DEFINE_SPINLOCK(r4030_lock); 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds static void enable_r4030_irq(unsigned int irq) 231da177e4SLinus Torvalds { 241da177e4SLinus Torvalds unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ); 251da177e4SLinus Torvalds unsigned long flags; 261da177e4SLinus Torvalds 271da177e4SLinus Torvalds spin_lock_irqsave(&r4030_lock, flags); 281da177e4SLinus Torvalds mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); 291da177e4SLinus Torvalds r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); 301da177e4SLinus Torvalds spin_unlock_irqrestore(&r4030_lock, flags); 311da177e4SLinus Torvalds } 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds static unsigned int startup_r4030_irq(unsigned int irq) 341da177e4SLinus Torvalds { 351da177e4SLinus Torvalds enable_r4030_irq(irq); 361da177e4SLinus Torvalds return 0; /* never anything pending */ 371da177e4SLinus Torvalds } 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #define shutdown_r4030_irq disable_r4030_irq 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds void disable_r4030_irq(unsigned int irq) 421da177e4SLinus Torvalds { 431da177e4SLinus Torvalds unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ)); 441da177e4SLinus Torvalds unsigned long flags; 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds spin_lock_irqsave(&r4030_lock, flags); 471da177e4SLinus Torvalds mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); 481da177e4SLinus Torvalds r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); 491da177e4SLinus Torvalds spin_unlock_irqrestore(&r4030_lock, flags); 501da177e4SLinus Torvalds } 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds #define mask_and_ack_r4030_irq disable_r4030_irq 531da177e4SLinus Torvalds 541da177e4SLinus Torvalds static void end_r4030_irq(unsigned int irq) 551da177e4SLinus Torvalds { 561da177e4SLinus Torvalds if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) 571da177e4SLinus Torvalds enable_r4030_irq(irq); 581da177e4SLinus Torvalds } 591da177e4SLinus Torvalds 601da177e4SLinus Torvalds static struct hw_interrupt_type r4030_irq_type = { 618ab00b9aSRalf Baechle .typename = "R4030", 628ab00b9aSRalf Baechle .startup = startup_r4030_irq, 638ab00b9aSRalf Baechle .shutdown = shutdown_r4030_irq, 648ab00b9aSRalf Baechle .enable = enable_r4030_irq, 658ab00b9aSRalf Baechle .disable = disable_r4030_irq, 668ab00b9aSRalf Baechle .ack = mask_and_ack_r4030_irq, 678ab00b9aSRalf Baechle .end = end_r4030_irq, 681da177e4SLinus Torvalds }; 691da177e4SLinus Torvalds 701da177e4SLinus Torvalds void __init init_r4030_ints(void) 711da177e4SLinus Torvalds { 721da177e4SLinus Torvalds int i; 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++) { 751da177e4SLinus Torvalds irq_desc[i].status = IRQ_DISABLED; 761da177e4SLinus Torvalds irq_desc[i].action = 0; 771da177e4SLinus Torvalds irq_desc[i].depth = 1; 781da177e4SLinus Torvalds irq_desc[i].handler = &r4030_irq_type; 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0); 821da177e4SLinus Torvalds r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */ 831da177e4SLinus Torvalds r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */ 841da177e4SLinus Torvalds } 851da177e4SLinus Torvalds 861da177e4SLinus Torvalds /* 871da177e4SLinus Torvalds * On systems with i8259-style interrupt controllers we assume for 881da177e4SLinus Torvalds * driver compatibility reasons interrupts 0 - 15 to be the i8259 891da177e4SLinus Torvalds * interrupts even if the hardware uses a different interrupt numbering. 901da177e4SLinus Torvalds */ 911da177e4SLinus Torvalds void __init arch_init_irq(void) 921da177e4SLinus Torvalds { 931da177e4SLinus Torvalds set_except_vector(0, jazz_handle_int); 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds init_i8259_irqs(); /* Integrated i8259 */ 961da177e4SLinus Torvalds init_r4030_ints(); 971da177e4SLinus Torvalds 981da177e4SLinus Torvalds change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1); 991da177e4SLinus Torvalds } 100