qemu/roms/u-boot/arch/sparc/cpu/leon3/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 #include <ambapp.h>
  26
  27 /* 15 normal irqs and a non maskable interrupt */
  28 #define NR_IRQS 15
  29
  30 struct irq_action {
  31         interrupt_handler_t *handler;
  32         void *arg;
  33         unsigned int count;
  34 };
  35
  36 extern ambapp_dev_irqmp *irqmp;
  37 extern ambapp_dev_gptimer *gptimer;
  38
  39 static struct irq_action irq_handlers[NR_IRQS] = { {0}, };
  40 static int spurious_irq_cnt = 0;
  41 static int spurious_irq = 0;
  42
  43 static inline unsigned int irqmp_get_irqmask(unsigned int irq)
  44 {
  45         if ((irq < 0) || (irq >= NR_IRQS)) {
  46                 return 0;
  47         } else {
  48                 return (1 << irq);
  49         }
  50
  51 }
  52
  53 static void leon3_ic_disable(unsigned int irq)
  54 {
  55         unsigned int mask, pil;
  56         if (!irqmp)
  57                 return;
  58
  59         pil = intLock();
  60
  61         /* get mask of interrupt */
  62         mask = irqmp_get_irqmask(irq);
  63
  64         /* set int level */
  65         irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) & (~mask);
  66
  67         intUnlock(pil);
  68 }
  69
  70 static void leon3_ic_enable(unsigned int irq)
  71 {
  72         unsigned int mask, pil;
  73         if (!irqmp)
  74                 return;
  75
  76         pil = intLock();
  77
  78         /* get mask of interrupt */
  79         mask = irqmp_get_irqmask(irq);
  80
  81         /* set int level */
  82         irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) | mask;
  83
  84         intUnlock(pil);
  85
  86 }
  87
  88 void handler_irq(int irq, struct pt_regs *regs)
  89 {
  90         if (irq_handlers[irq].handler) {
  91                 if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) ||
  92                     ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE)
  93                     ) {
  94                         printf("handler_irq: bad handler: %x, irq number %d\n",
  95                                (unsigned int)irq_handlers[irq].handler, irq);
  96                         return;
  97                 }
  98                 irq_handlers[irq].handler(irq_handlers[irq].arg);
  99                 irq_handlers[irq].count++;
 100         } else {
 101                 spurious_irq_cnt++;
 102                 spurious_irq = irq;
 103         }
 104 }
 105
 106 void leon3_force_int(int irq)
 107 {
 108         if (!irqmp || (irq >= NR_IRQS) || (irq < 0))
 109                 return;
 110         printf("Forcing interrupt %d\n", irq);
 111
 112         irqmp->iforce = SPARC_NOCACHE_READ(&irqmp->iforce) | (1 << irq);
 113 }
 114
 115 /****************************************************************************/
 116
 117 int interrupt_init_cpu(void)
 118 {
 119
 120         return (0);
 121 }
 122
 123 /****************************************************************************/
 124
 125 /* Handle Timer 0 IRQ */
 126 void timer_interrupt_cpu(void *arg)
 127 {
 128         gptimer->e[0].ctrl = (LEON3_GPTIMER_EN |
 129                               LEON3_GPTIMER_RL |
 130                               LEON3_GPTIMER_LD | LEON3_GPTIMER_IRQEN);
 131         /* nothing to do here */
 132         return;
 133 }
 134
 135 /****************************************************************************/
 136
 137 /*
 138  * Install and free a interrupt handler.
 139  */
 140
 141 void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
 142 {
 143         if (irq < 0 || irq >= NR_IRQS) {
 144                 printf("irq_install_handler: bad irq number %d\n", irq);
 145                 return;
 146         }
 147
 148         if (irq_handlers[irq].handler != NULL)
 149                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
 150                        (ulong) handler, (ulong) irq_handlers[irq].handler);
 151
 152         if (((unsigned int)handler > CONFIG_SYS_RAM_END) ||
 153             ((unsigned int)handler < CONFIG_SYS_RAM_BASE)
 154             ) {
 155                 printf("irq_install_handler: bad handler: %x, irq number %d\n",
 156                        (unsigned int)handler, irq);
 157                 return;
 158         }
 159         irq_handlers[irq].handler = handler;
 160         irq_handlers[irq].arg = arg;
 161
 162         /* enable irq on IRQMP hardware */
 163         leon3_ic_enable(irq);
 164
 165 }
 166
 167 void irq_free_handler(int irq)
 168 {
 169         if (irq < 0 || irq >= NR_IRQS) {
 170                 printf("irq_free_handler: bad irq number %d\n", irq);
 171                 return;
 172         }
 173
 174         /* disable irq on IRQMP hardware */
 175         leon3_ic_disable(irq);
 176
 177         irq_handlers[irq].handler = NULL;
 178         irq_handlers[irq].arg = NULL;
 179 }
 180
 181 /****************************************************************************/
 182
 183 #if defined(CONFIG_CMD_IRQ)
 184 void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
 185 {
 186         int irq;
 187         unsigned int pil = get_pil();
 188         printf("PIL level: %u\n\r", pil);
 189         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 190                spurious_irq_cnt, spurious_irq);
 191
 192         puts("\nInterrupt-Information:\n" "Nr  Routine   Arg       Count\n");
 193
 194         for (irq = 0; irq < NR_IRQS; irq++) {
 195                 if (irq_handlers[irq].handler != NULL) {
 196                         printf("%02d  %p  %p  %d\n", irq,
 197                                irq_handlers[irq].handler,
 198                                irq_handlers[irq].arg,
 199                                irq_handlers[irq].count);
 200                 }
 201         }
 202 }
 203 #endif