arch/mips/sibyte/bcm1480/smp.c

   1 /*
   2  * Copyright (C) 2001,2002,2004 Broadcom Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #include <linux/init.h>
  20 #include <linux/delay.h>
  21 #include <linux/smp.h>
  22 #include <linux/kernel_stat.h>
  23
  24 #include <asm/mmu_context.h>
  25 #include <asm/io.h>
  26 #include <asm/sibyte/sb1250.h>
  27 #include <asm/sibyte/bcm1480_regs.h>
  28 #include <asm/sibyte/bcm1480_int.h>
  29
  30 extern void smp_call_function_interrupt(void);
  31
  32 /*
  33  * These are routines for dealing with the bcm1480 smp capabilities
  34  * independent of board/firmware
  35  */
  36
  37 static void *mailbox_0_set_regs[] = {
  38         IOADDR(A_BCM1480_IMR_CPU0_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU),
  39         IOADDR(A_BCM1480_IMR_CPU1_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU),
  40         IOADDR(A_BCM1480_IMR_CPU2_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU),
  41         IOADDR(A_BCM1480_IMR_CPU3_BASE + R_BCM1480_IMR_MAILBOX_0_SET_CPU),
  42 };
  43
  44 static void *mailbox_0_clear_regs[] = {
  45         IOADDR(A_BCM1480_IMR_CPU0_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU),
  46         IOADDR(A_BCM1480_IMR_CPU1_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU),
  47         IOADDR(A_BCM1480_IMR_CPU2_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU),
  48         IOADDR(A_BCM1480_IMR_CPU3_BASE + R_BCM1480_IMR_MAILBOX_0_CLR_CPU),
  49 };
  50
  51 static void *mailbox_0_regs[] = {
  52         IOADDR(A_BCM1480_IMR_CPU0_BASE + R_BCM1480_IMR_MAILBOX_0_CPU),
  53         IOADDR(A_BCM1480_IMR_CPU1_BASE + R_BCM1480_IMR_MAILBOX_0_CPU),
  54         IOADDR(A_BCM1480_IMR_CPU2_BASE + R_BCM1480_IMR_MAILBOX_0_CPU),
  55         IOADDR(A_BCM1480_IMR_CPU3_BASE + R_BCM1480_IMR_MAILBOX_0_CPU),
  56 };
  57
  58 /*
  59  * SMP init and finish on secondary CPUs
  60  */
  61 void bcm1480_smp_init(void)
  62 {
  63         unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 |
  64                 STATUSF_IP1 | STATUSF_IP0;
  65
  66         /* Set interrupt mask, but don't enable */
  67         change_c0_status(ST0_IM, imask);
  68 }
  69
  70 void bcm1480_smp_finish(void)
  71 {
  72         extern void bcm1480_time_init(void);
  73         bcm1480_time_init();
  74         local_irq_enable();
  75 }
  76
  77 /*
  78  * These are routines for dealing with the sb1250 smp capabilities
  79  * independent of board/firmware
  80  */
  81
  82 /*
  83  * Simple enough; everything is set up, so just poke the appropriate mailbox
  84  * register, and we should be set
  85  */
  86 void core_send_ipi(int cpu, unsigned int action)
  87 {
  88         __raw_writeq((((u64)action)<< 48), mailbox_0_set_regs[cpu]);
  89 }
  90
  91 void bcm1480_mailbox_interrupt(struct pt_regs *regs)
  92 {
  93         int cpu = smp_processor_id();
  94         unsigned int action;
  95
  96         kstat_this_cpu.irqs[K_BCM1480_INT_MBOX_0_0]++;
  97         /* Load the mailbox register to figure out what we're supposed to do */
  98         action = (__raw_readq(mailbox_0_regs[cpu]) >> 48) & 0xffff;
  99
 100         /* Clear the mailbox to clear the interrupt */
 101         __raw_writeq(((u64)action)<<48, mailbox_0_clear_regs[cpu]);
 102
 103         /*
 104          * Nothing to do for SMP_RESCHEDULE_YOURSELF; returning from the
 105          * interrupt will do the reschedule for us
 106          */
 107
 108         if (action & SMP_CALL_FUNCTION)
 109                 smp_call_function_interrupt();
 110 }