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/mm.h>
13#include <linux/module.h>
14#include <linux/cpumask.h>
15#include <asm/cpu.h>
16#include <asm/io.h>
17#include <asm/pgtable.h>
18#include <asm/time.h>
19#include <asm/sn/types.h>
20#include <asm/sn/sn0/addrs.h>
21#include <asm/sn/sn0/hubni.h>
22#include <asm/sn/sn0/hubio.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/hub.h>
28#include <asm/sn/intr.h>
29#include <asm/current.h>
30#include <asm/smp.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
50extern void pcibr_setup(cnodeid_t);
51
52extern void xtalk_probe_node(cnodeid_t nid);
53
54static void __init per_hub_init(cnodeid_t cnode)
55{
56	struct hub_data *hub = hub_data(cnode);
57	nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
58	int i;
59
60	cpu_set(smp_processor_id(), hub->h_cpus);
61
62	if (test_and_set_bit(cnode, hub_init_mask))
63		return;
64	/*
65	 * Set CRB timeout at 5ms, (< PI timeout of 10ms)
66	 */
67	REMOTE_HUB_S(nasid, IIO_ICTP, 0x800);
68	REMOTE_HUB_S(nasid, IIO_ICTO, 0xff);
69
70	hub_rtc_init(cnode);
71	xtalk_probe_node(cnode);
72
73#ifdef CONFIG_REPLICATE_EXHANDLERS
74	/*
75	 * If this is not a headless node initialization,
76	 * copy over the caliased exception handlers.
77	 */
78	if (get_compact_nodeid() == cnode) {
79		extern char except_vec2_generic, except_vec3_generic;
80		extern void build_tlb_refill_handler(void);
81
82		memcpy((void *)(CKSEG0 + 0x100), &except_vec2_generic, 0x80);
83		memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x80);
84		build_tlb_refill_handler();
85		memcpy((void *)(CKSEG0 + 0x100), (void *) CKSEG0, 0x80);
86		memcpy((void *)(CKSEG0 + 0x180), &except_vec3_generic, 0x100);
87		__flush_cache_all();
88	}
89#endif
90
91	/*
92	 * Some interrupts are reserved by hardware or by software convention.
93	 * Mark these as reserved right away so they won't be used accidently
94	 * later.
95	 */
96	for (i = 0; i <= BASE_PCI_IRQ; i++) {
97		__set_bit(i, hub->irq_alloc_mask);
98		LOCAL_HUB_CLR_INTR(INT_PEND0_BASELVL + i);
99	}
100
101	__set_bit(IP_PEND0_6_63, hub->irq_alloc_mask);
102	LOCAL_HUB_S(PI_INT_PEND_MOD, IP_PEND0_6_63);
103
104	for (i = NI_BRDCAST_ERR_A; i <= MSC_PANIC_INTR; i++) {
105		__set_bit(i, hub->irq_alloc_mask);
106		LOCAL_HUB_CLR_INTR(INT_PEND1_BASELVL + i);
107	}
108}
109
110void __init per_cpu_init(void)
111{
112	int cpu = smp_processor_id();
113	int slice = LOCAL_HUB_L(PI_CPU_NUM);
114	cnodeid_t cnode = get_compact_nodeid();
115	struct hub_data *hub = hub_data(cnode);
116	struct slice_data *si = hub->slice + slice;
117	int i;
118
119	if (test_and_set_bit(slice, &hub->slice_map))
120		return;
121
122	clear_c0_status(ST0_IM);
123
124	per_hub_init(cnode);
125
126	for (i = 0; i < LEVELS_PER_SLICE; i++)
127		si->level_to_irq[i] = -1;
128
129	/*
130	 * We use this so we can find the local hub's data as fast as only
131	 * possible.
132	 */
133	cpu_data[cpu].data = si;
134
135	cpu_time_init();
136	install_ipi();
137
138	/* Install our NMI handler if symmon hasn't installed one. */
139	install_cpu_nmi_handler(cputoslice(cpu));
140
141	set_c0_status(SRB_DEV0 | SRB_DEV1);
142}
143
144/*
145 * get_nasid() returns the physical node id number of the caller.
146 */
147nasid_t
148get_nasid(void)
149{
150	return (nasid_t)((LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_NODEID_MASK)
151	                 >> NSRI_NODEID_SHFT);
152}
153
154/*
155 * Map the physical node id to a virtual node id (virtual node ids are contiguous).
156 */
157cnodeid_t get_compact_nodeid(void)
158{
159	return NASID_TO_COMPACT_NODEID(get_nasid());
160}
161
162static inline void ioc3_sio_init(void)
163{
164	struct ioc3 *ioc3;
165	nasid_t nid;
166	long loops;
167
168	nid = get_nasid();
169	ioc3 = (struct ioc3 *) KL_CONFIG_CH_CONS_INFO(nid)->memory_base;
170
171	ioc3->sscr_a = 0;			/* PIO mode for uarta.  */
172	ioc3->sscr_b = 0;			/* PIO mode for uartb.  */
173	ioc3->sio_iec = ~0;
174	ioc3->sio_ies = (SIO_IR_SA_INT | SIO_IR_SB_INT);
175
176	loops=1000000; while(loops--);
177	ioc3->sregs.uarta.iu_fcr = 0;
178	ioc3->sregs.uartb.iu_fcr = 0;
179	loops=1000000; while(loops--);
180}
181
182static inline void ioc3_eth_init(void)
183{
184	struct ioc3 *ioc3;
185	nasid_t nid;
186
187	nid = get_nasid();
188	ioc3 = (struct ioc3 *) KL_CONFIG_CH_CONS_INFO(nid)->memory_base;
189
190	ioc3->eier = 0;
191}
192
193extern void ip27_time_init(void);
194extern void ip27_reboot_setup(void);
195
196void __init plat_mem_setup(void)
197{
198	hubreg_t p, e, n_mode;
199	nasid_t nid;
200
201	ip27_reboot_setup();
202
203	/*
204	 * hub_rtc init and cpu clock intr enabled for later calibrate_delay.
205	 */
206	nid = get_nasid();
207	printk("IP27: Running on node %d.\n", nid);
208
209	p = LOCAL_HUB_L(PI_CPU_PRESENT_A) & 1;
210	e = LOCAL_HUB_L(PI_CPU_ENABLE_A) & 1;
211	printk("Node %d has %s primary CPU%s.\n", nid,
212	       p ? "a" : "no",
213	       e ? ", CPU is running" : "");
214
215	p = LOCAL_HUB_L(PI_CPU_PRESENT_B) & 1;
216	e = LOCAL_HUB_L(PI_CPU_ENABLE_B) & 1;
217	printk("Node %d has %s secondary CPU%s.\n", nid,
218	       p ? "a" : "no",
219	       e ? ", CPU is running" : "");
220
221	/*
222	 * Try to catch kernel missconfigurations and give user an
223	 * indication what option to select.
224	 */
225	n_mode = LOCAL_HUB_L(NI_STATUS_REV_ID) & NSRI_MORENODES_MASK;
226	printk("Machine is in %c mode.\n", n_mode ? 'N' : 'M');
227#ifdef CONFIG_SGI_SN_N_MODE
228	if (!n_mode)
229		panic("Kernel compiled for M mode.");
230#else
231	if (n_mode)
232		panic("Kernel compiled for N mode.");
233#endif
234
235	ioc3_sio_init();
236	ioc3_eth_init();
237	per_cpu_init();
238
239	set_io_port_base(IO_BASE);
240
241	board_time_init = ip27_time_init;
242}
243