arch/sparc/cpu/leon2/interrupts.c

   1 /*
   2  * (C) Copyright 2007
   3  * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com
   4  *
   5  * (C) Copyright 2006
   6  * Detlev Zundel, DENX Software Engineering, dzu@denx.de
   7  *
   8  * (C) Copyright -2003
   9  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  10  *
  11  * (C) Copyright 2001
  12  * Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
  13  *
  14  * SPDX-License-Identifier:     GPL-2.0+
  15  */
  16
  17 #include <asm/stack.h>
  18 #include <common.h>
  19 #include <asm/io.h>
  20 #include <asm/processor.h>
  21 #include <command.h>
  22 #include <asm/irq.h>
  23
  24 #include <asm/leon.h>
  25
  26 /* 15 normal irqs and a non maskable interrupt */
  27 #define NR_IRQS 15
  28
  29 struct irq_action {
  30         interrupt_handler_t *handler;
  31         void *arg;
  32         unsigned int count;
  33 };
  34
  35 static struct irq_action irq_handlers[NR_IRQS] = { {0}, };
  36 static int spurious_irq_cnt = 0;
  37 static int spurious_irq = 0;
  38
  39 static inline unsigned int leon2_get_irqmask(unsigned int irq)
  40 {
  41         if ((irq < 0) || (irq >= NR_IRQS)) {
  42                 return 0;
  43         } else {
  44                 return (1 << irq);
  45         }
  46 }
  47
  48 static void leon2_ic_disable(unsigned int irq)
  49 {
  50         unsigned int mask, pil;
  51         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
  52
  53         pil = intLock();
  54
  55         /* get mask of interrupt */
  56         mask = leon2_get_irqmask(irq);
  57
  58         /* set int level */
  59         leon2->Interrupt_Mask =
  60             SPARC_NOCACHE_READ(&leon2->Interrupt_Mask) & (~mask);
  61
  62         intUnlock(pil);
  63 }
  64
  65 static void leon2_ic_enable(unsigned int irq)
  66 {
  67         unsigned int mask, pil;
  68         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
  69
  70         pil = intLock();
  71
  72         /* get mask of interrupt */
  73         mask = leon2_get_irqmask(irq);
  74
  75         /* set int level */
  76         leon2->Interrupt_Mask =
  77             SPARC_NOCACHE_READ(&leon2->Interrupt_Mask) | mask;
  78
  79         intUnlock(pil);
  80 }
  81
  82 void handler_irq(int irq, struct pt_regs *regs)
  83 {
  84         if (irq_handlers[irq].handler) {
  85                 if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) ||
  86                     ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE)
  87                     ) {
  88                         printf("handler_irq: bad handler: %x, irq number %d\n",
  89                                (unsigned int)irq_handlers[irq].handler, irq);
  90                         return;
  91                 }
  92                 irq_handlers[irq].handler(irq_handlers[irq].arg);
  93                 irq_handlers[irq].count++;
  94         } else {
  95                 spurious_irq_cnt++;
  96                 spurious_irq = irq;
  97         }
  98 }
  99
 100 void leon2_force_int(int irq)
 101 {
 102         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
 103
 104         if ((irq >= NR_IRQS) || (irq < 0))
 105                 return;
 106         printf("Forcing interrupt %d\n", irq);
 107
 108         leon2->Interrupt_Force =
 109             SPARC_NOCACHE_READ(&leon2->Interrupt_Force) | (1 << irq);
 110 }
 111
 112 /****************************************************************************/
 113
 114 int interrupt_init_cpu(void)
 115 {
 116         return (0);
 117 }
 118
 119 /****************************************************************************/
 120
 121 /* Handle Timer 0 IRQ */
 122 void timer_interrupt_cpu(void *arg)
 123 {
 124         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
 125
 126         leon2->Timer_Control_1 =
 127             (LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS | LEON2_TIMER_CTRL_LD);
 128
 129         /* nothing to do here */
 130         return;
 131 }
 132
 133 /****************************************************************************/
 134
 135 /*
 136  * Install and free a interrupt handler.
 137  */
 138
 139 void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
 140 {
 141         if (irq < 0 || irq >= NR_IRQS) {
 142                 printf("irq_install_handler: bad irq number %d\n", irq);
 143                 return;
 144         }
 145
 146         if (irq_handlers[irq].handler != NULL)
 147                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
 148                        (ulong) handler, (ulong) irq_handlers[irq].handler);
 149
 150         if (((unsigned int)handler > CONFIG_SYS_RAM_END) ||
 151             ((unsigned int)handler < CONFIG_SYS_RAM_BASE)
 152             ) {
 153                 printf("irq_install_handler: bad handler: %x, irq number %d\n",
 154                        (unsigned int)handler, irq);
 155                 return;
 156         }
 157         irq_handlers[irq].handler = handler;
 158         irq_handlers[irq].arg = arg;
 159
 160         /* enable irq on LEON2 hardware */
 161         leon2_ic_enable(irq);
 162
 163 }
 164
 165 void irq_free_handler(int irq)
 166 {
 167         if (irq < 0 || irq >= NR_IRQS) {
 168                 printf("irq_free_handler: bad irq number %d\n", irq);
 169                 return;
 170         }
 171
 172         /* disable irq on LEON2 hardware */
 173         leon2_ic_disable(irq);
 174
 175         irq_handlers[irq].handler = NULL;
 176         irq_handlers[irq].arg = NULL;
 177 }
 178
 179 /****************************************************************************/
 180
 181 #if defined(CONFIG_CMD_IRQ)
 182 void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
 183 {
 184         int irq;
 185         unsigned int pil = get_pil();
 186         printf("PIL level: %u\n\r", pil);
 187         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 188                spurious_irq_cnt, spurious_irq);
 189
 190         puts("\nInterrupt-Information:\n" "Nr  Routine   Arg       Count\n");
 191
 192         for (irq = 0; irq < NR_IRQS; irq++) {
 193                 if (irq_handlers[irq].handler != NULL) {
 194                         printf("%02d  %p  %p  %d\n", irq,
 195                                irq_handlers[irq].handler,
 196                                irq_handlers[irq].arg,
 197                                irq_handlers[irq].count);
 198                 }
 199         }
 200 }
 201 #endif