1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 *  PS3 SMP routines.
4 *
5 *  Copyright (C) 2006 Sony Computer Entertainment Inc.
6 *  Copyright 2006 Sony Corp.
7 */
8
9#include <linux/kernel.h>
10#include <linux/smp.h>
11
12#include <asm/machdep.h>
13#include <asm/udbg.h>
14
15#include "platform.h"
16
17#if defined(DEBUG)
18#define DBG udbg_printf
19#else
20#define DBG pr_debug
21#endif
22
23/**
24  * ps3_ipi_virqs - a per cpu array of virqs for ipi use
25  */
26
27#define MSG_COUNT 4
28static DEFINE_PER_CPU(unsigned int [MSG_COUNT], ps3_ipi_virqs);
29
30static void ps3_smp_message_pass(int cpu, int msg)
31{
32	int result;
33	unsigned int virq;
34
35	if (msg >= MSG_COUNT) {
36		DBG("%s:%d: bad msg: %d\n", __func__, __LINE__, msg);
37		return;
38	}
39
40	virq = per_cpu(ps3_ipi_virqs, cpu)[msg];
41	result = ps3_send_event_locally(virq);
42
43	if (result)
44		DBG("%s:%d: ps3_send_event_locally(%d, %d) failed"
45			" (%d)\n", __func__, __LINE__, cpu, msg, result);
46}
47
48static void __init ps3_smp_probe(void)
49{
50	int cpu;
51
52	for (cpu = 0; cpu < 2; cpu++) {
53		int result;
54		unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
55		int i;
56
57		DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
58
59		/*
60		* Check assumptions on ps3_ipi_virqs[] indexing. If this
61		* check fails, then a different mapping of PPC_MSG_
62		* to index needs to be setup.
63		*/
64
65		BUILD_BUG_ON(PPC_MSG_CALL_FUNCTION    != 0);
66		BUILD_BUG_ON(PPC_MSG_RESCHEDULE       != 1);
67		BUILD_BUG_ON(PPC_MSG_TICK_BROADCAST   != 2);
68		BUILD_BUG_ON(PPC_MSG_NMI_IPI          != 3);
69
70		for (i = 0; i < MSG_COUNT; i++) {
71			result = ps3_event_receive_port_setup(cpu, &virqs[i]);
72
73			if (result)
74				continue;
75
76			DBG("%s:%d: (%d, %d) => virq %u\n",
77				__func__, __LINE__, cpu, i, virqs[i]);
78
79			result = smp_request_message_ipi(virqs[i], i);
80
81			if (result)
82				virqs[i] = 0;
83			else
84				ps3_register_ipi_irq(cpu, virqs[i]);
85		}
86
87		ps3_register_ipi_debug_brk(cpu, virqs[PPC_MSG_NMI_IPI]);
88
89		DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
90	}
91}
92
93void ps3_smp_cleanup_cpu(int cpu)
94{
95	unsigned int *virqs = per_cpu(ps3_ipi_virqs, cpu);
96	int i;
97
98	DBG(" -> %s:%d: (%d)\n", __func__, __LINE__, cpu);
99
100	for (i = 0; i < MSG_COUNT; i++) {
101		/* Can't call free_irq from interrupt context. */
102		ps3_event_receive_port_destroy(virqs[i]);
103		virqs[i] = 0;
104	}
105
106	DBG(" <- %s:%d: (%d)\n", __func__, __LINE__, cpu);
107}
108
109static struct smp_ops_t ps3_smp_ops = {
110	.probe		= ps3_smp_probe,
111	.message_pass	= ps3_smp_message_pass,
112	.kick_cpu	= smp_generic_kick_cpu,
113};
114
115void __init smp_init_ps3(void)
116{
117	DBG(" -> %s\n", __func__);
118	smp_ops = &ps3_smp_ops;
119	DBG(" <- %s\n", __func__);
120}
121