cpu/mpc85xx/interrupts.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2002 (440 port)
   6  * Scott McNutt, Artesyn Communication Producs, smcnutt@artsyncp.com
   7  *
   8  * (C) Copyright 2003 Motorola Inc. (MPC85xx port)
   9  * Xianghua Xiao (X.Xiao@motorola.com)
  10  *
  11  * See file CREDITS for list of people who contributed to this
  12  * project.
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License as
  16  * published by the Free Software Foundation; either version 2 of
  17  * the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  27  * MA 02111-1307 USA
  28  */
  29
  30 #include <common.h>
  31 #include <watchdog.h>
  32 #include <command.h>
  33 #include <asm/processor.h>
  34 #include <ppc_asm.tmpl>
  35
  36 unsigned decrementer_count;             /* count value for 1e6/HZ microseconds */
  37
  38 static __inline__ unsigned long get_msr(void)
  39 {
  40         unsigned long msr;
  41
  42         asm volatile("mfmsr %0" : "=r" (msr) :);
  43         return msr;
  44 }
  45
  46 static __inline__ void set_msr(unsigned long msr)
  47 {
  48         asm volatile("mtmsr %0" : : "r" (msr));
  49         asm volatile("isync");
  50 }
  51
  52 static __inline__ unsigned long get_dec (void)
  53 {
  54         unsigned long val;
  55
  56         asm volatile ("mfdec %0":"=r" (val):);
  57
  58         return val;
  59 }
  60
  61
  62 static __inline__ void set_dec (unsigned long val)
  63 {
  64         if (val)
  65                 asm volatile ("mtdec %0"::"r" (val));
  66 }
  67
  68 void enable_interrupts (void)
  69 {
  70         set_msr (get_msr() | MSR_EE);
  71 }
  72
  73 /* returns flag if MSR_EE was set before */
  74 int disable_interrupts (void)
  75 {
  76         ulong msr = get_msr();
  77         set_msr (msr & ~MSR_EE);
  78         return ((msr & MSR_EE) != 0);
  79 }
  80
  81 int interrupt_init (void)
  82 {
  83         volatile ccsr_pic_t *pic = (void *)(CFG_MPC85xx_PIC_ADDR);
  84
  85         pic->gcr = MPC85xx_PICGCR_RST;
  86         while (pic->gcr & MPC85xx_PICGCR_RST);
  87         pic->gcr = MPC85xx_PICGCR_M;
  88         decrementer_count = get_tbclk() / CFG_HZ;
  89         mtspr(SPRN_TCR, TCR_PIE);
  90         set_dec (decrementer_count);
  91         set_msr (get_msr () | MSR_EE);
  92
  93 #ifdef CONFIG_INTERRUPTS
  94         pic->iivpr1 = 0x810002; /* 50220 enable ecm interrupts */
  95         debug("iivpr1@%x = %x\n",&pic->iivpr1, pic->iivpr1);
  96
  97         pic->iivpr2 = 0x810002; /* 50240 enable ddr interrupts */
  98         debug("iivpr2@%x = %x\n",&pic->iivpr2, pic->iivpr2);
  99
 100         pic->iivpr3 = 0x810003; /* 50260 enable lbc interrupts */
 101         debug("iivpr3@%x = %x\n",&pic->iivpr3, pic->iivpr3);
 102
 103 #ifdef CONFIG_PCI1
 104         pic->iivpr8 = 0x810008; /* enable pci1 interrupts */
 105         debug("iivpr8@%x = %x\n",&pic->iivpr8, pic->iivpr8);
 106 #endif
 107 #if defined(CONFIG_PCI2) || defined(CONFIG_PCIE2)
 108         pic->iivpr9 = 0x810009; /* enable pci1 interrupts */
 109         debug("iivpr9@%x = %x\n",&pic->iivpr9, pic->iivpr9);
 110 #endif
 111 #ifdef CONFIG_PCIE1
 112         pic->iivpr10 = 0x81000a;        /* enable pcie1 interrupts */
 113         debug("iivpr10@%x = %x\n",&pic->iivpr10, pic->iivpr10);
 114 #endif
 115 #ifdef CONFIG_PCIE3
 116         pic->iivpr11 = 0x81000b;        /* enable pcie3 interrupts */
 117         debug("iivpr11@%x = %x\n",&pic->iivpr11, pic->iivpr11);
 118 #endif
 119
 120         pic->ctpr=0;            /* 40080 clear current task priority register */
 121 #endif
 122
 123         return (0);
 124 }
 125
 126 /*
 127  * Install and free a interrupt handler. Not implemented yet.
 128  */
 129
 130 void
 131 irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
 132 {
 133         return;
 134 }
 135
 136 void
 137 irq_free_handler(int vec)
 138 {
 139         return;
 140 }
 141
 142 /****************************************************************************/
 143
 144
 145 volatile ulong timestamp = 0;
 146
 147 /*
 148  * timer_interrupt - gets called when the decrementer overflows,
 149  * with interrupts disabled.
 150  * Trivial implementation - no need to be really accurate.
 151  */
 152 void timer_interrupt(struct pt_regs *regs)
 153 {
 154         timestamp++;
 155         set_dec (decrementer_count);
 156         mtspr(SPRN_TSR, TSR_PIS);
 157 #if defined(CONFIG_WATCHDOG)
 158         if ((timestamp % 1000) == 0)
 159                 reset_85xx_watchdog();
 160 #endif /* CONFIG_WATCHDOG */
 161 }
 162
 163 void reset_timer (void)
 164 {
 165         timestamp = 0;
 166 }
 167
 168 ulong get_timer (ulong base)
 169 {
 170         return (timestamp - base);
 171 }
 172
 173 void set_timer (ulong t)
 174 {
 175         timestamp = t;
 176 }
 177
 178 #if defined(CONFIG_CMD_IRQ)
 179
 180 /*******************************************************************************
 181  *
 182  * irqinfo - print information about PCI devices,not implemented.
 183  *
 184  */
 185 int
 186 do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 187 {
 188         printf ("\nInterrupt-unsupported:\n");
 189
 190         return 0;
 191 }
 192
 193 #endif