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 #include <grlib/irqmp.h>
  27 #include <grlib/gptimer.h>
  28
  29 /* 15 normal irqs and a non maskable interrupt */
  30 #define NR_IRQS 15
  31
  32 struct irq_action {
  33         interrupt_handler_t *handler;
  34         void *arg;
  35         unsigned int count;
  36 };
  37
  38 extern ambapp_dev_irqmp *irqmp;
  39 extern ambapp_dev_gptimer *gptimer;
  40
  41 static struct irq_action irq_handlers[NR_IRQS] = { {0}, };
  42 static int spurious_irq_cnt = 0;
  43 static int spurious_irq = 0;
  44
  45 static inline unsigned int irqmp_get_irqmask(unsigned int irq)
  46 {
  47         if ((irq < 0) || (irq >= NR_IRQS)) {
  48                 return 0;
  49         } else {
  50                 return (1 << irq);
  51         }
  52
  53 }
  54
  55 static void leon3_ic_disable(unsigned int irq)
  56 {
  57         unsigned int mask, pil;
  58         if (!irqmp)
  59                 return;
  60
  61         pil = intLock();
  62
  63         /* get mask of interrupt */
  64         mask = irqmp_get_irqmask(irq);
  65
  66         /* set int level */
  67         irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) & (~mask);
  68
  69         intUnlock(pil);
  70 }
  71
  72 static void leon3_ic_enable(unsigned int irq)
  73 {
  74         unsigned int mask, pil;
  75         if (!irqmp)
  76                 return;
  77
  78         pil = intLock();
  79
  80         /* get mask of interrupt */
  81         mask = irqmp_get_irqmask(irq);
  82
  83         /* set int level */
  84         irqmp->cpu_mask[0] = SPARC_NOCACHE_READ(&irqmp->cpu_mask[0]) | mask;
  85
  86         intUnlock(pil);
  87
  88 }
  89
  90 void handler_irq(int irq, struct pt_regs *regs)
  91 {
  92         if (irq_handlers[irq].handler) {
  93                 if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) ||
  94                     ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE)
  95                     ) {
  96                         printf("handler_irq: bad handler: %x, irq number %d\n",
  97                                (unsigned int)irq_handlers[irq].handler, irq);
  98                         return;
  99                 }
 100                 irq_handlers[irq].handler(irq_handlers[irq].arg);
 101                 irq_handlers[irq].count++;
 102         } else {
 103                 spurious_irq_cnt++;
 104                 spurious_irq = irq;
 105         }
 106 }
 107
 108 void leon3_force_int(int irq)
 109 {
 110         if (!irqmp || (irq >= NR_IRQS) || (irq < 0))
 111                 return;
 112         printf("Forcing interrupt %d\n", irq);
 113
 114         irqmp->iforce = SPARC_NOCACHE_READ(&irqmp->iforce) | (1 << irq);
 115 }
 116
 117 /****************************************************************************/
 118
 119 int interrupt_init_cpu(void)
 120 {
 121
 122         return (0);
 123 }
 124
 125 /****************************************************************************/
 126
 127 /*
 128  * Install and free a interrupt handler.
 129  */
 130
 131 void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
 132 {
 133         if (irq < 0 || irq >= NR_IRQS) {
 134                 printf("irq_install_handler: bad irq number %d\n", irq);
 135                 return;
 136         }
 137
 138         if (irq_handlers[irq].handler != NULL)
 139                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
 140                        (ulong) handler, (ulong) irq_handlers[irq].handler);
 141
 142         if (((unsigned int)handler > CONFIG_SYS_RAM_END) ||
 143             ((unsigned int)handler < CONFIG_SYS_RAM_BASE)
 144             ) {
 145                 printf("irq_install_handler: bad handler: %x, irq number %d\n",
 146                        (unsigned int)handler, irq);
 147                 return;
 148         }
 149         irq_handlers[irq].handler = handler;
 150         irq_handlers[irq].arg = arg;
 151
 152         /* enable irq on IRQMP hardware */
 153         leon3_ic_enable(irq);
 154
 155 }
 156
 157 void irq_free_handler(int irq)
 158 {
 159         if (irq < 0 || irq >= NR_IRQS) {
 160                 printf("irq_free_handler: bad irq number %d\n", irq);
 161                 return;
 162         }
 163
 164         /* disable irq on IRQMP hardware */
 165         leon3_ic_disable(irq);
 166
 167         irq_handlers[irq].handler = NULL;
 168         irq_handlers[irq].arg = NULL;
 169 }
 170
 171 /****************************************************************************/
 172
 173 #if defined(CONFIG_CMD_IRQ)
 174 void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
 175 {
 176         int irq;
 177         unsigned int pil = get_pil();
 178         printf("PIL level: %u\n\r", pil);
 179         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 180                spurious_irq_cnt, spurious_irq);
 181
 182         puts("\nInterrupt-Information:\n" "Nr  Routine   Arg       Count\n");
 183
 184         for (irq = 0; irq < NR_IRQS; irq++) {
 185                 if (irq_handlers[irq].handler != NULL) {
 186                         printf("%02d  %p  %p  %d\n", irq,
 187                                irq_handlers[irq].handler,
 188                                irq_handlers[irq].arg,
 189                                irq_handlers[irq].count);
 190                 }
 191         }
 192 }
 193 #endif