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/module.h>
15#include <linux/cpumask.h>
16#include <asm/cpu.h>
17#include <asm/io.h>
18#include <asm/pgtable.h>
19#include <asm/time.h>
20#include <asm/sn/types.h>
21#include <asm/sn/sn0/addrs.h>
22#include <asm/sn/sn0/hubni.h>
23#include <asm/sn/sn0/hubio.h>
24#include <asm/sn/klconfig.h>
25#include <asm/sn/ioc3.h>
26#include <asm/mipsregs.h>
27#include <asm/sn/gda.h>
28#include <asm/sn/hub.h>
29#include <asm/sn/intr.h>
30#include <asm/current.h>
31#include <asm/processor.h>
32#include <asm/mmu_context.h>
33#include <asm/thread_info.h>
34#include <asm/sn/launch.h>
35#include <asm/sn/sn_private.h>
36#include <asm/sn/sn0/ip27.h>
37#include <asm/sn/mapped_kernel.h>
38
39#define CPU_NONE		(cpuid_t)-1
40
41static DECLARE_BITMAP(hub_init_mask, MAX_COMPACT_NODES);
42nasid_t master_nasid = INVALID_NASID;
43
44cnodeid_t	nasid_to_compact_node[MAX_NASIDS];
45nasid_t		compact_to_nasid_node[MAX_COMPACT_NODES];
46cnodeid_t	cpuid_to_compact_node[MAXCPUS];
47
48EXPORT_SYMBOL(nasid_to_compact_node);
49
50struct cpuinfo_ip27 sn_cpu_info[NR_CPUS];
51EXPORT_SYMBOL_GPL(sn_cpu_info);
52
53extern void pcibr_setup(cnodeid_t);
54
55extern void xtalk_probe_node(cnodeid_t nid);
56
57static void per_hub_init(cnodeid_t cnode)
58{
59	struct hub_data *hub = hub_data(cnode);
60	nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
61	int i;
62
63	cpumask_set_cpu(smp_processor_id(), &hub->h_cpus);
64
65	if (test_and_set_bit(cnode, hub_init_mask))
66		return;
67	/*
68	 * Set CRB timeout at 5ms, (< PI timeout of 10ms)
69	 */
70	REMOTE_HUB_S(nasid, IIO_ICTP, 0x800);
71	REMOTE_HUB_S(nasid, IIO_ICTO, 0xff);
72
73	hub_rtc_init(cnode);
74	xtalk_probe_node(cnode);
75
76#ifdef CONFIG_REPLICATE_EXHANDLERS
77	/*
78	 * If this is not a headless node initialization,
79	 * copy over the caliased exception handlers.
80	 */
81	if (get_compact_nodeid() == cnode) {
82		extern char except_vec2_generic, except_vec3_generic;
83		extern void build_tlb_refill_handler(void);
84
85		memcpy((void *)(CKSEG0 + 0x100), &except_vec2_generic, 0x80);
86		memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x80);
87		build_tlb_refill_handler();
88		memcpy((void *)(CKSEG0 + 0x100), (void *) CKSEG0, 0x80);
89		memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x100);
90		__flush_cache_all();
91	}
92#endif
93
94	/*
95	 * Some interrupts are reserved by hardware or by software convention.
96	 * Mark these as reserved right away so they won't be used accidentally
97	 * later.
98	 */
99	for (i = 0; i <= BASE_PCI_IRQ; i++) {
100		__set_bit(i, hub->irq_alloc_mask);
101		LOCAL_HUB_CLR_INTR(INT_PEND0_BASELVL + i);
102	}
103
104	__set_bit(IP_PEND0_6_63, hub->irq_alloc_mask);
105	LOCAL_HUB_S(PI_INT_PEND_MOD, IP_PEND0_6_63);
106
107	for (i = NI_BRDCAST_ERR_A; i <= MSC_PANIC_INTR; i++) {
108		__set_bit(i, hub->irq_alloc_mask);
109		LOCAL_HUB_CLR_INTR(INT_PEND1_BASELVL + i);
110	}
111}
112
113void per_cpu_init(void)
114{
115	int cpu = smp_processor_id();
116	int slice = LOCAL_HUB_L(PI_CPU_NUM);
117	cnodeid_t cnode = get_compact_nodeid();
118	struct hub_data *hub = hub_data(cnode);
119	struct slice_data *si = hub->slice + slice;
120	int i;
121
122	if (test_and_set_bit(slice, &hub->slice_map))
123		return;
124
125	clear_c0_status(ST0_IM);
126
127	per_hub_init(cnode);
128
129	for (i = 0; i < LEVELS_PER_SLICE; i++)
130		si->level_to_irq[i] = -1;
131
132	/*
133	 * We use this so we can find the local hub's data as fast as only
134	 * possible.
135	 */
136	cpu_data[cpu].data = si;
137
138	cpu_time_init();
139	install_ipi();
140
141	/* Install our NMI handler if symmon hasn't installed one. */
142	install_cpu_nmi_handler(cputoslice(cpu));
143
144	set_c0_status(SRB_DEV0 | SRB_DEV1);
145}
146
147/*
148 * get_nasid() returns the physical node id number of the caller.
149 */
150nasid_t
151get_nasid(void)
152{
153	return (nasid_t)((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_NODEID_MASK)
154			 >> NSRI_NODEID_SHFT);
155}
156
157/*
158 * Map the physical node id to a virtual node id (virtual node ids are contiguous).
159 */
160cnodeid_t get_compact_nodeid(void)
161{
162	return NASID_TO_COMPACT_NODEID(get_nasid());
163}
164
165static inline void ioc3_eth_init(void)
166{
167	struct ioc3 *ioc3;
168	nasid_t nid;
169
170	nid = get_nasid();
171	ioc3 = (struct ioc3 *) KL_CONFIG_CH_CONS_INFO(nid)->memory_base;
172
173	ioc3->eier = 0;
174}
175
176extern void ip27_reboot_setup(void);
177
178void __init plat_mem_setup(void)
179{
180	hubreg_t p, e, n_mode;
181	nasid_t nid;
182
183	ip27_reboot_setup();
184
185	/*
186	 * hub_rtc init and cpu clock intr enabled for later calibrate_delay.
187	 */
188	nid = get_nasid();
189	printk("IP27: Running on node %d.\n", nid);
190
191	p = LOCAL_HUB_L(PI_CPU_PRESENT_A) & 1;
192	e = LOCAL_HUB_L(PI_CPU_ENABLE_A) & 1;
193	printk("Node %d has %s primary CPU%s.\n", nid,
194	       p ? "a" : "no",
195	       e ? ", CPU is running" : "");
196
197	p = LOCAL_HUB_L(PI_CPU_PRESENT_B) & 1;
198	e = LOCAL_HUB_L(PI_CPU_ENABLE_B) & 1;
199	printk("Node %d has %s secondary CPU%s.\n", nid,
200	       p ? "a" : "no",
201	       e ? ", CPU is running" : "");
202
203	/*
204	 * Try to catch kernel missconfigurations and give user an
205	 * indication what option to select.
206	 */
207	n_mode = LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_MORENODES_MASK;
208	printk("Machine is in %c mode.\n", n_mode ? 'N' : 'M');
209#ifdef CONFIG_SGI_SN_N_MODE
210	if (!n_mode)
211		panic("Kernel compiled for M mode.");
212#else
213	if (n_mode)
214		panic("Kernel compiled for N mode.");
215#endif
216
217	ioc3_eth_init();
218	per_cpu_init();
219
220	set_io_port_base(IO_BASE);
221}
222