1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 1992 Linus Torvalds 7 * Copyright (C) 1994 - 2001, 2003 Ralf Baechle 8 */ 9 #include <linux/init.h> 10 #include <linux/interrupt.h> 11 #include <linux/kernel.h> 12 #include <linux/spinlock.h> 13 14 #include <asm/i8259.h> 15 #include <asm/io.h> 16 #include <asm/jazz.h> 17 18 static DEFINE_SPINLOCK(r4030_lock); 19 20 static void enable_r4030_irq(unsigned int irq) 21 { 22 unsigned int mask = 1 << (irq - JAZZ_PARALLEL_IRQ); 23 unsigned long flags; 24 25 spin_lock_irqsave(&r4030_lock, flags); 26 mask |= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); 27 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); 28 spin_unlock_irqrestore(&r4030_lock, flags); 29 } 30 31 void disable_r4030_irq(unsigned int irq) 32 { 33 unsigned int mask = ~(1 << (irq - JAZZ_PARALLEL_IRQ)); 34 unsigned long flags; 35 36 spin_lock_irqsave(&r4030_lock, flags); 37 mask &= r4030_read_reg16(JAZZ_IO_IRQ_ENABLE); 38 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, mask); 39 spin_unlock_irqrestore(&r4030_lock, flags); 40 } 41 42 static struct irq_chip r4030_irq_type = { 43 .name = "R4030", 44 .ack = disable_r4030_irq, 45 .mask = disable_r4030_irq, 46 .mask_ack = disable_r4030_irq, 47 .unmask = enable_r4030_irq, 48 }; 49 50 void __init init_r4030_ints(void) 51 { 52 int i; 53 54 for (i = JAZZ_PARALLEL_IRQ; i <= JAZZ_TIMER_IRQ; i++) 55 set_irq_chip_and_handler(i, &r4030_irq_type, handle_level_irq); 56 57 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 0); 58 r4030_read_reg16(JAZZ_IO_IRQ_SOURCE); /* clear pending IRQs */ 59 r4030_read_reg32(JAZZ_R4030_INVAL_ADDR); /* clear error bits */ 60 } 61 62 /* 63 * On systems with i8259-style interrupt controllers we assume for 64 * driver compatibility reasons interrupts 0 - 15 to be the i8259 65 * interrupts even if the hardware uses a different interrupt numbering. 66 */ 67 void __init arch_init_irq(void) 68 { 69 init_i8259_irqs(); /* Integrated i8259 */ 70 init_r4030_ints(); 71 72 change_c0_status(ST0_IM, IE_IRQ4 | IE_IRQ3 | IE_IRQ2 | IE_IRQ1); 73 } 74 75 static void loc_call(unsigned int irq, unsigned int mask) 76 { 77 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 78 r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) & mask); 79 do_IRQ(irq); 80 r4030_write_reg16(JAZZ_IO_IRQ_ENABLE, 81 r4030_read_reg16(JAZZ_IO_IRQ_ENABLE) | mask); 82 } 83 84 static void ll_local_dev(void) 85 { 86 switch (r4030_read_reg32(JAZZ_IO_IRQ_SOURCE)) { 87 case 0: 88 panic("Unimplemented loc_no_irq handler"); 89 break; 90 case 4: 91 loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_PARALLEL); 92 break; 93 case 8: 94 loc_call(JAZZ_PARALLEL_IRQ, JAZZ_IE_FLOPPY); 95 break; 96 case 12: 97 panic("Unimplemented loc_sound handler"); 98 break; 99 case 16: 100 panic("Unimplemented loc_video handler"); 101 break; 102 case 20: 103 loc_call(JAZZ_ETHERNET_IRQ, JAZZ_IE_ETHERNET); 104 break; 105 case 24: 106 loc_call(JAZZ_SCSI_IRQ, JAZZ_IE_SCSI); 107 break; 108 case 28: 109 loc_call(JAZZ_KEYBOARD_IRQ, JAZZ_IE_KEYBOARD); 110 break; 111 case 32: 112 loc_call(JAZZ_MOUSE_IRQ, JAZZ_IE_MOUSE); 113 break; 114 case 36: 115 loc_call(JAZZ_SERIAL1_IRQ, JAZZ_IE_SERIAL1); 116 break; 117 case 40: 118 loc_call(JAZZ_SERIAL2_IRQ, JAZZ_IE_SERIAL2); 119 break; 120 } 121 } 122 123 asmlinkage void plat_irq_dispatch(void) 124 { 125 unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM; 126 127 if (pending & IE_IRQ5) 128 write_c0_compare(0); 129 else if (pending & IE_IRQ4) { 130 r4030_read_reg32(JAZZ_TIMER_REGISTER); 131 do_IRQ(JAZZ_TIMER_IRQ); 132 } else if (pending & IE_IRQ3) 133 panic("Unimplemented ISA NMI handler"); 134 else if (pending & IE_IRQ2) 135 do_IRQ(r4030_read_reg32(JAZZ_EISA_IRQ_ACK)); 136 else if (pending & IE_IRQ1) { 137 ll_local_dev(); 138 } else if (unlikely(pending & IE_IRQ0)) 139 panic("Unimplemented local_dma handler"); 140 else if (pending & IE_SW1) { 141 clear_c0_cause(IE_SW1); 142 panic("Unimplemented sw1 handler"); 143 } else if (pending & IE_SW0) { 144 clear_c0_cause(IE_SW0); 145 panic("Unimplemented sw0 handler"); 146 } 147 } 148