cpu/mpc86xx/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  * (C) Copyright 2004, 2007 Freescale Semiconductor. (MPC86xx Port)
  12  * Jeff Brown
  13  * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
  14  *
  15  * See file CREDITS for list of people who contributed to this
  16  * project.
  17  *
  18  * This program is free software; you can redistribute it and/or
  19  * modify it under the terms of the GNU General Public License as
  20  * published by the Free Software Foundation; either version 2 of
  21  * the License, or (at your option) any later version.
  22  *
  23  * This program is distributed in the hope that it will be useful,
  24  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  25  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  26  * GNU General Public License for more details.
  27  *
  28  * You should have received a copy of the GNU General Public License
  29  * along with this program; if not, write to the Free Software
  30  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  31  * MA 02111-1307 USA
  32  */
  33
  34 #include <common.h>
  35 #include <mpc86xx.h>
  36 #include <command.h>
  37 #include <asm/processor.h>
  38 #include <ppc_asm.tmpl>
  39
  40 unsigned long decrementer_count;    /* count value for 1e6/HZ microseconds */
  41 unsigned long timestamp;
  42
  43
  44 static __inline__ unsigned long get_msr(void)
  45 {
  46         unsigned long msr;
  47
  48         asm volatile ("mfmsr %0":"=r" (msr):);
  49
  50         return msr;
  51 }
  52
  53 static __inline__ void set_msr(unsigned long msr)
  54 {
  55         asm volatile ("mtmsr %0"::"r" (msr));
  56 }
  57
  58 static __inline__ unsigned long get_dec(void)
  59 {
  60         unsigned long val;
  61
  62         asm volatile ("mfdec %0":"=r" (val):);
  63
  64         return val;
  65 }
  66
  67 static __inline__ void set_dec(unsigned long val)
  68 {
  69         if (val)
  70                 asm volatile ("mtdec %0"::"r" (val));
  71 }
  72
  73 /* interrupt is not supported yet */
  74 int interrupt_init_cpu(unsigned long *decrementer_count)
  75 {
  76         return 0;
  77 }
  78
  79 int interrupt_init(void)
  80 {
  81         int ret;
  82
  83         volatile immap_t *immr = (immap_t *)CFG_IMMR;
  84         immr->im_pic.gcr = MPC86xx_PICGCR_RST;
  85         while (immr->im_pic.gcr & MPC86xx_PICGCR_RST);
  86         immr->im_pic.gcr = MPC86xx_PICGCR_MODE;
  87
  88         /* call cpu specific function from $(CPU)/interrupts.c */
  89         ret = interrupt_init_cpu(&decrementer_count);
  90
  91         if (ret)
  92                 return ret;
  93
  94         decrementer_count = get_tbclk() / CFG_HZ;
  95         debug("interrupt init: tbclk() = %d MHz, decrementer_count = %ld\n",
  96               (get_tbclk() / 1000000),
  97               decrementer_count);
  98
  99         set_dec(decrementer_count);
 100
 101         set_msr(get_msr() | MSR_EE);
 102
 103         debug("MSR = 0x%08lx, Decrementer reg = 0x%08lx\n",
 104               get_msr(),
 105               get_dec());
 106
 107 #ifdef CONFIG_INTERRUPTS
 108         volatile ccsr_pic_t *pic = &immr->im_pic;
 109
 110         pic->iivpr1 = 0x810001; /* 50220 enable mcm interrupts */
 111         debug("iivpr1@%x = %x\n", &pic->iivpr1, pic->iivpr1);
 112
 113         pic->iivpr2 = 0x810002; /* 50240 enable ddr interrupts */
 114         debug("iivpr2@%x = %x\n", &pic->iivpr2, pic->iivpr2);
 115
 116         pic->iivpr3 = 0x810003; /* 50260 enable lbc interrupts */
 117         debug("iivpr3@%x = %x\n", &pic->iivpr3, pic->iivpr3);
 118
 119 #if defined(CONFIG_PCI1) || defined(CONFIG_PCIE1)
 120         pic->iivpr8 = 0x810008; /* enable pcie1 interrupts */
 121         debug("iivpr8@%x = %x\n", &pic->iivpr8, pic->iivpr8);
 122 #endif
 123 #if defined(CONFIG_PCI2) || defined(CONFIG_PCIE2)
 124         pic->iivpr9 = 0x810009; /* enable pcie2 interrupts */
 125         debug("iivpr9@%x = %x\n", &pic->iivpr9, pic->iivpr9);
 126 #endif
 127
 128         pic->ctpr = 0;  /* 40080 clear current task priority register */
 129 #endif
 130
 131         return 0;
 132 }
 133
 134 void enable_interrupts(void)
 135 {
 136         set_msr(get_msr() | MSR_EE);
 137 }
 138
 139 /* returns flag if MSR_EE was set before */
 140 int disable_interrupts(void)
 141 {
 142         ulong msr = get_msr();
 143
 144         set_msr(msr & ~MSR_EE);
 145         return (msr & MSR_EE) != 0;
 146 }
 147
 148 void increment_timestamp(void)
 149 {
 150         timestamp++;
 151 }
 152
 153 /*
 154  * timer_interrupt - gets called when the decrementer overflows,
 155  * with interrupts disabled.
 156  * Trivial implementation - no need to be really accurate.
 157  */
 158 void timer_interrupt_cpu(struct pt_regs *regs)
 159 {
 160         /* nothing to do here */
 161 }
 162
 163 void timer_interrupt(struct pt_regs *regs)
 164 {
 165         /* call cpu specific function from $(CPU)/interrupts.c */
 166         timer_interrupt_cpu(regs);
 167
 168         timestamp++;
 169
 170         /* Restore Decrementer Count */
 171         set_dec(decrementer_count);
 172
 173 #if defined(CONFIG_WATCHDOG) || defined (CONFIG_HW_WATCHDOG)
 174         if ((timestamp % (CFG_WATCHDOG_FREQ)) == 0)
 175                 WATCHDOG_RESET();
 176 #endif /* CONFIG_WATCHDOG || CONFIG_HW_WATCHDOG */
 177
 178 #ifdef CONFIG_STATUS_LED
 179         status_led_tick(timestamp);
 180 #endif /* CONFIG_STATUS_LED */
 181
 182 #ifdef CONFIG_SHOW_ACTIVITY
 183         board_show_activity(timestamp);
 184 #endif /* CONFIG_SHOW_ACTIVITY */
 185
 186 }
 187
 188 void reset_timer(void)
 189 {
 190         timestamp = 0;
 191 }
 192
 193 ulong get_timer(ulong base)
 194 {
 195         return timestamp - base;
 196 }
 197
 198 void set_timer(ulong t)
 199 {
 200         timestamp = t;
 201 }
 202
 203 /*
 204  * Install and free a interrupt handler. Not implemented yet.
 205  */
 206
 207 void irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
 208 {
 209 }
 210
 211 void irq_free_handler(int vec)
 212 {
 213 }
 214
 215 /*
 216  * irqinfo - print information about PCI devices,not implemented.
 217  */
 218 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 219 {
 220         printf("\nInterrupt-unsupported:\n");
 221
 222         return 0;
 223 }
 224
 225 /*
 226  * Handle external interrupts
 227  */
 228 void external_interrupt(struct pt_regs *regs)
 229 {
 230         puts("external_interrupt (oops!)\n");
 231 }