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  * See file CREDITS for list of people who contributed to this
  15  * project.
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License as
  19  * published by the Free Software Foundation; either version 2 of
  20  * the License, or (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  30  * MA 02111-1307 USA
  31  */
  32
  33 #include <asm/stack.h>
  34 #include <common.h>
  35 #include <asm/io.h>
  36 #include <asm/processor.h>
  37 #include <command.h>
  38 #include <asm/irq.h>
  39
  40 #include <asm/leon.h>
  41
  42 /* 15 normal irqs and a non maskable interrupt */
  43 #define NR_IRQS 15
  44
  45 struct irq_action {
  46         interrupt_handler_t *handler;
  47         void *arg;
  48         unsigned int count;
  49 };
  50
  51 static struct irq_action irq_handlers[NR_IRQS] = { {0}, };
  52 static int spurious_irq_cnt = 0;
  53 static int spurious_irq = 0;
  54
  55 static inline unsigned int leon2_get_irqmask(unsigned int irq)
  56 {
  57         if ((irq < 0) || (irq >= NR_IRQS)) {
  58                 return 0;
  59         } else {
  60                 return (1 << irq);
  61         }
  62 }
  63
  64 static void leon2_ic_disable(unsigned int irq)
  65 {
  66         unsigned int mask, pil;
  67         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
  68
  69         pil = intLock();
  70
  71         /* get mask of interrupt */
  72         mask = leon2_get_irqmask(irq);
  73
  74         /* set int level */
  75         leon2->Interrupt_Mask =
  76             SPARC_NOCACHE_READ(&leon2->Interrupt_Mask) & (~mask);
  77
  78         intUnlock(pil);
  79 }
  80
  81 static void leon2_ic_enable(unsigned int irq)
  82 {
  83         unsigned int mask, pil;
  84         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
  85
  86         pil = intLock();
  87
  88         /* get mask of interrupt */
  89         mask = leon2_get_irqmask(irq);
  90
  91         /* set int level */
  92         leon2->Interrupt_Mask =
  93             SPARC_NOCACHE_READ(&leon2->Interrupt_Mask) | mask;
  94
  95         intUnlock(pil);
  96 }
  97
  98 void handler_irq(int irq, struct pt_regs *regs)
  99 {
 100         if (irq_handlers[irq].handler) {
 101                 if (((unsigned int)irq_handlers[irq].handler > CONFIG_SYS_RAM_END) ||
 102                     ((unsigned int)irq_handlers[irq].handler < CONFIG_SYS_RAM_BASE)
 103                     ) {
 104                         printf("handler_irq: bad handler: %x, irq number %d\n",
 105                                (unsigned int)irq_handlers[irq].handler, irq);
 106                         return;
 107                 }
 108                 irq_handlers[irq].handler(irq_handlers[irq].arg);
 109                 irq_handlers[irq].count++;
 110         } else {
 111                 spurious_irq_cnt++;
 112                 spurious_irq = irq;
 113         }
 114 }
 115
 116 void leon2_force_int(int irq)
 117 {
 118         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
 119
 120         if ((irq >= NR_IRQS) || (irq < 0))
 121                 return;
 122         printf("Forcing interrupt %d\n", irq);
 123
 124         leon2->Interrupt_Force =
 125             SPARC_NOCACHE_READ(&leon2->Interrupt_Force) | (1 << irq);
 126 }
 127
 128 /****************************************************************************/
 129
 130 int interrupt_init_cpu(void)
 131 {
 132         return (0);
 133 }
 134
 135 /****************************************************************************/
 136
 137 /* Handle Timer 0 IRQ */
 138 void timer_interrupt_cpu(void *arg)
 139 {
 140         LEON2_regs *leon2 = (LEON2_regs *) LEON2_PREGS;
 141
 142         leon2->Timer_Control_1 =
 143             (LEON2_TIMER_CTRL_EN | LEON2_TIMER_CTRL_RS | LEON2_TIMER_CTRL_LD);
 144
 145         /* nothing to do here */
 146         return;
 147 }
 148
 149 /****************************************************************************/
 150
 151 /*
 152  * Install and free a interrupt handler.
 153  */
 154
 155 void irq_install_handler(int irq, interrupt_handler_t * handler, void *arg)
 156 {
 157         if (irq < 0 || irq >= NR_IRQS) {
 158                 printf("irq_install_handler: bad irq number %d\n", irq);
 159                 return;
 160         }
 161
 162         if (irq_handlers[irq].handler != NULL)
 163                 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n",
 164                        (ulong) handler, (ulong) irq_handlers[irq].handler);
 165
 166         if (((unsigned int)handler > CONFIG_SYS_RAM_END) ||
 167             ((unsigned int)handler < CONFIG_SYS_RAM_BASE)
 168             ) {
 169                 printf("irq_install_handler: bad handler: %x, irq number %d\n",
 170                        (unsigned int)handler, irq);
 171                 return;
 172         }
 173         irq_handlers[irq].handler = handler;
 174         irq_handlers[irq].arg = arg;
 175
 176         /* enable irq on LEON2 hardware */
 177         leon2_ic_enable(irq);
 178
 179 }
 180
 181 void irq_free_handler(int irq)
 182 {
 183         if (irq < 0 || irq >= NR_IRQS) {
 184                 printf("irq_free_handler: bad irq number %d\n", irq);
 185                 return;
 186         }
 187
 188         /* disable irq on LEON2 hardware */
 189         leon2_ic_disable(irq);
 190
 191         irq_handlers[irq].handler = NULL;
 192         irq_handlers[irq].arg = NULL;
 193 }
 194
 195 /****************************************************************************/
 196
 197 #if defined(CONFIG_CMD_IRQ)
 198 void do_irqinfo(cmd_tbl_t * cmdtp, bd_t * bd, int flag, int argc, char * const argv[])
 199 {
 200         int irq;
 201         unsigned int pil = get_pil();
 202         printf("PIL level: %u\n\r", pil);
 203         printf("Spurious IRQ: %u, last unknown IRQ: %d\n",
 204                spurious_irq_cnt, spurious_irq);
 205
 206         puts("\nInterrupt-Information:\n" "Nr  Routine   Arg       Count\n");
 207
 208         for (irq = 0; irq < NR_IRQS; irq++) {
 209                 if (irq_handlers[irq].handler != NULL) {
 210                         printf("%02d  %08lx  %08lx  %ld\n", irq,
 211                                (unsigned int)irq_handlers[irq].handler,
 212                                (unsigned int)irq_handlers[irq].arg,
 213                                irq_handlers[irq].count);
 214                 }
 215         }
 216 }
 217 #endif