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
148
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