arch/mips/sgi-ip27/ip27-init.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General
   3  * Public License.  See the file "COPYING" in the main directory of this
   4  * archive for more details.
   5  *
   6  * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
   7  * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
   8  */
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/sched.h>
  12 #include <linux/smp.h>
  13 #include <linux/mm.h>
  14 #include <linux/export.h>
  15 #include <linux/cpumask.h>
  16 #include <asm/bootinfo.h>
  17 #include <asm/cpu.h>
  18 #include <asm/io.h>
  19 #include <asm/sgialib.h>
  20 #include <asm/time.h>
  21 #include <asm/sn/agent.h>
  22 #include <asm/sn/types.h>
  23 #include <asm/sn/klconfig.h>
  24 #include <asm/sn/ioc3.h>
  25 #include <asm/mipsregs.h>
  26 #include <asm/sn/gda.h>
  27 #include <asm/sn/intr.h>
  28 #include <asm/current.h>
  29 #include <asm/processor.h>
  30 #include <asm/mmu_context.h>
  31 #include <asm/thread_info.h>
  32 #include <asm/sn/launch.h>
  33 #include <asm/sn/mapped_kernel.h>
  34
  35 #include "ip27-common.h"
  36
  37 #define CPU_NONE                (cpuid_t)-1
  38
  39 static DECLARE_BITMAP(hub_init_mask, MAX_NUMNODES);
  40 nasid_t master_nasid = INVALID_NASID;
  41
  42 struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
  43 EXPORT_SYMBOL_GPL(sn_cpu_info);
  44
  45 static void per_hub_init(nasid_t nasid)
  46 {
  47         struct hub_data *hub = hub_data(nasid);
  48
  49         cpumask_set_cpu(smp_processor_id(), &hub->h_cpus);
  50
  51         if (test_and_set_bit(nasid, hub_init_mask))
  52                 return;
  53         /*
  54          * Set CRB timeout at 5ms, (< PI timeout of 10ms)
  55          */
  56         REMOTE_HUB_S(nasid, IIO_ICTP, 0x800);
  57         REMOTE_HUB_S(nasid, IIO_ICTO, 0xff);
  58
  59         hub_rtc_init(nasid);
  60
  61         if (nasid) {
  62                 /* copy exception handlers from first node to current node */
  63                 memcpy((void *)NODE_OFFSET_TO_K0(nasid, 0),
  64                        (void *)CKSEG0, 0x200);
  65                 __flush_cache_all();
  66                 /* switch to node local exception handlers */
  67                 REMOTE_HUB_S(nasid, PI_CALIAS_SIZE, PI_CALIAS_SIZE_8K);
  68         }
  69 }
  70
  71 void per_cpu_init(void)
  72 {
  73         int cpu = smp_processor_id();
  74         nasid_t nasid = get_nasid();
  75
  76         clear_c0_status(ST0_IM);
  77
  78         per_hub_init(nasid);
  79
  80         pr_info("CPU %d clock is %dMHz.\n", cpu, sn_cpu_info[cpu].p_speed);
  81
  82         install_ipi();
  83
  84         /* Install our NMI handler if symmon hasn't installed one. */
  85         install_cpu_nmi_handler(cputoslice(cpu));
  86
  87         enable_percpu_irq(IP27_HUB_PEND0_IRQ, IRQ_TYPE_NONE);
  88         enable_percpu_irq(IP27_HUB_PEND1_IRQ, IRQ_TYPE_NONE);
  89 }
  90
  91 void __init plat_mem_setup(void)
  92 {
  93         u64 p, e, n_mode;
  94         nasid_t nid;
  95
  96         register_smp_ops(&ip27_smp_ops);
  97
  98         ip27_reboot_setup();
  99
 100         /*
 101          * hub_rtc init and cpu clock intr enabled for later calibrate_delay.
 102          */
 103         nid = get_nasid();
 104         printk("IP27: Running on node %d.\n", nid);
 105
 106         p = LOCAL_HUB_L(PI_CPU_PRESENT_A) & 1;
 107         e = LOCAL_HUB_L(PI_CPU_ENABLE_A) & 1;
 108         printk("Node %d has %s primary CPU%s.\n", nid,
 109                p ? "a" : "no",
 110                e ? ", CPU is running" : "");
 111
 112         p = LOCAL_HUB_L(PI_CPU_PRESENT_B) & 1;
 113         e = LOCAL_HUB_L(PI_CPU_ENABLE_B) & 1;
 114         printk("Node %d has %s secondary CPU%s.\n", nid,
 115                p ? "a" : "no",
 116                e ? ", CPU is running" : "");
 117
 118         /*
 119          * Try to catch kernel missconfigurations and give user an
 120          * indication what option to select.
 121          */
 122         n_mode = LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_MORENODES_MASK;
 123         printk("Machine is in %c mode.\n", n_mode ? 'N' : 'M');
 124 #ifdef CONFIG_SGI_SN_N_MODE
 125         if (!n_mode)
 126                 panic("Kernel compiled for M mode.");
 127 #else
 128         if (n_mode)
 129                 panic("Kernel compiled for N mode.");
 130 #endif
 131
 132         ioport_resource.start = 0;
 133         ioport_resource.end = ~0UL;
 134         set_io_port_base(IO_BASE);
 135 }
 136
 137 const char *get_system_type(void)
 138 {
 139         return "SGI Origin";
 140 }
 141
 142 void __init prom_init(void)
 143 {
 144         prom_init_cmdline(fw_arg0, (LONG *)fw_arg1);
 145         prom_meminit();
 146 }
 147