zy7_mp.c revision 281092 
1/*-
2 * Copyright (c) 2013 Thomas Skibo.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include <sys/cdefs.h>
26__FBSDID("$FreeBSD: head/sys/arm/xilinx/zy7_mp.c 281092 2015-04-04 23:03:11Z andrew $");
27#include <sys/param.h>
28#include <sys/systm.h>
29#include <sys/bus.h>
30#include <sys/lock.h>
31#include <sys/mutex.h>
32#include <sys/smp.h>
33
34#include <vm/vm.h>
35#include <vm/pmap.h>
36
37#include <machine/smp.h>
38#include <machine/fdt.h>
39#include <machine/intr.h>
40
41#include <arm/xilinx/zy7_reg.h>
42
43#define	ZYNQ7_CPU1_ENTRY	0xfffffff0
44
45#define	SCU_CONTROL_REG		0xf8f00000
46#define	   SCU_CONTROL_ENABLE	(1 << 0)
47
48void
49platform_mp_init_secondary(void)
50{
51
52	arm_init_secondary_ic();
53}
54
55void
56platform_mp_setmaxid(void)
57{
58
59	mp_maxid = 1;
60}
61
62int
63platform_mp_probe(void)
64{
65
66	mp_ncpus = 2;
67	return (1);
68}
69
70void
71platform_mp_start_ap(void)
72{
73	bus_space_handle_t scu_handle;
74	bus_space_handle_t ocm_handle;
75	uint32_t scu_ctrl;
76
77	/* Map in SCU control register. */
78	if (bus_space_map(fdtbus_bs_tag, SCU_CONTROL_REG, 4,
79			  0, &scu_handle) != 0)
80		panic("platform_mp_start_ap: Couldn't map SCU config reg\n");
81
82	/* Set SCU enable bit. */
83	scu_ctrl = bus_space_read_4(fdtbus_bs_tag, scu_handle, 0);
84	scu_ctrl |= SCU_CONTROL_ENABLE;
85	bus_space_write_4(fdtbus_bs_tag, scu_handle, 0, scu_ctrl);
86
87	bus_space_unmap(fdtbus_bs_tag, scu_handle, 4);
88
89	/* Map in magic location to give entry address to CPU1. */
90	if (bus_space_map(fdtbus_bs_tag, ZYNQ7_CPU1_ENTRY, 4,
91	    0, &ocm_handle) != 0)
92		panic("platform_mp_start_ap: Couldn't map OCM\n");
93
94	/* Write start address for CPU1. */
95	bus_space_write_4(fdtbus_bs_tag, ocm_handle, 0,
96	    pmap_kextract((vm_offset_t)mpentry));
97
98	bus_space_unmap(fdtbus_bs_tag, ocm_handle, 4);
99
100	/*
101	 * The SCU is enabled above but I think the second CPU doesn't
102	 * turn on filtering until after the wake-up below. I think that's why
103	 * things don't work if I don't put these cache ops here.  Also, the
104	 * magic location, 0xfffffff0, isn't in the SCU's filtering range so it
105	 * needs a write-back too.
106	 */
107	cpu_idcache_wbinv_all();
108	cpu_l2cache_wbinv_all();
109
110	/* Wake up CPU1. */
111	armv7_sev();
112}
113
114void
115platform_ipi_send(cpuset_t cpus, u_int ipi)
116{
117
118	pic_ipi_send(cpus, ipi);
119}
120