1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2000-2002 4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 * 6 * (C) Copyright 2004, Psyent Corporation <www.psyent.com> 7 * Scott McNutt <smcnutt@psyent.com> 8 */ 9 10 #include <common.h> 11 #include <command.h> 12 #include <asm/nios2.h> 13 #include <asm/types.h> 14 #include <asm/io.h> 15 #include <asm/ptrace.h> 16 17 /*************************************************************************/ 18 struct irq_action { 19 interrupt_handler_t *handler; 20 void *arg; 21 int count; 22 }; 23 24 static struct irq_action vecs[32]; 25 26 int disable_interrupts (void) 27 { 28 int val = rdctl (CTL_STATUS); 29 wrctl (CTL_STATUS, val & ~STATUS_IE); 30 return (val & STATUS_IE); 31 } 32 33 void enable_interrupts( void ) 34 { 35 int val = rdctl (CTL_STATUS); 36 wrctl (CTL_STATUS, val | STATUS_IE); 37 } 38 39 void external_interrupt (struct pt_regs *regs) 40 { 41 unsigned irqs; 42 struct irq_action *act; 43 44 /* Evaluate only irqs that are both enabled AND pending */ 45 irqs = rdctl (CTL_IENABLE) & rdctl (CTL_IPENDING); 46 act = vecs; 47 48 /* Assume (as does the Nios2 HAL) that bit 0 is highest 49 * priority. NOTE: There is ALWAYS a handler assigned 50 * (the default if no other). 51 */ 52 while (irqs) { 53 if (irqs & 1) { 54 act->handler (act->arg); 55 act->count++; 56 } 57 irqs >>=1; 58 act++; 59 } 60 } 61 62 static void def_hdlr (void *arg) 63 { 64 unsigned irqs = rdctl (CTL_IENABLE); 65 66 /* Disable the individual interrupt -- with gratuitous 67 * warning. 68 */ 69 irqs &= ~(1 << (int)arg); 70 wrctl (CTL_IENABLE, irqs); 71 printf ("WARNING: Disabling unhandled interrupt: %d\n", 72 (int)arg); 73 } 74 75 /*************************************************************************/ 76 void irq_install_handler (int irq, interrupt_handler_t *hdlr, void *arg) 77 { 78 79 int flag; 80 struct irq_action *act; 81 unsigned ena = rdctl (CTL_IENABLE); 82 83 if ((irq < 0) || (irq > 31)) 84 return; 85 act = &vecs[irq]; 86 87 flag = disable_interrupts (); 88 if (hdlr) { 89 act->handler = hdlr; 90 act->arg = arg; 91 ena |= (1 << irq); /* enable */ 92 } else { 93 act->handler = def_hdlr; 94 act->arg = (void *)irq; 95 ena &= ~(1 << irq); /* disable */ 96 } 97 wrctl (CTL_IENABLE, ena); 98 if (flag) enable_interrupts (); 99 } 100 101 102 int interrupt_init (void) 103 { 104 int i; 105 106 /* Assign the default handler to all */ 107 for (i = 0; i < 32; i++) { 108 vecs[i].handler = def_hdlr; 109 vecs[i].arg = (void *)i; 110 vecs[i].count = 0; 111 } 112 113 enable_interrupts (); 114 return (0); 115 } 116 117 118 /*************************************************************************/ 119 #if defined(CONFIG_CMD_IRQ) 120 int do_irqinfo (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 121 { 122 int i; 123 struct irq_action *act = vecs; 124 125 printf ("\nInterrupt-Information:\n\n"); 126 printf ("Nr Routine Arg Count\n"); 127 printf ("-----------------------------\n"); 128 129 for (i=0; i<32; i++) { 130 if (act->handler != def_hdlr) { 131 printf ("%02d %08lx %08lx %d\n", 132 i, 133 (ulong)act->handler, 134 (ulong)act->arg, 135 act->count); 136 } 137 act++; 138 } 139 printf ("\n"); 140 141 return (0); 142 } 143 #endif 144