1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2021 Adrian Chadd <adrian@FreeBSD.org>
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include "opt_platform.h"
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33 #include <sys/reboot.h>
34 #include <sys/devmap.h>
35 #include <sys/smp.h>
36
37 #include <vm/vm.h>
38
39 #include <machine/cpu.h>
40 #include <machine/bus.h>
41 #include <machine/intr.h>
42 #include <machine/machdep.h>
43 #include <machine/platformvar.h>
44 #include <machine/smp.h>
45
46 #include <dev/fdt/fdt_common.h>
47 #include <dev/ofw/openfirm.h>
48 #include <dev/ofw/ofw_cpu.h>
49
50 #include <arm/qualcomm/ipq4018_machdep.h>
51 #include <arm/qualcomm/qcom_scm_legacy.h>
52 #include <arm/qualcomm/qcom_cpu_kpssv2.h>
53
54 #include "platform_if.h"
55
56 void
ipq4018_mp_setmaxid(platform_t plat)57 ipq4018_mp_setmaxid(platform_t plat)
58 {
59 int ncpu;
60
61 /* If we've already set the global vars don't bother to do it again. */
62 if (mp_ncpus != 0)
63 return;
64
65 /* Read current CP15 Cache Size ID Register */
66 ncpu = cp15_l2ctlr_get();
67 ncpu = CPUV7_L2CTLR_NPROC(ncpu);
68
69 mp_ncpus = ncpu;
70 mp_maxid = ncpu - 1;
71
72 printf("SMP: ncpu=%d\n", ncpu);
73 }
74
75 static bool
ipq4018_start_ap(u_int id,phandle_t node,u_int addr_cells,pcell_t * arg)76 ipq4018_start_ap(u_int id, phandle_t node, u_int addr_cells, pcell_t *arg)
77 {
78
79 /*
80 * For the IPQ401x we assume the enable method is
81 * "qcom,kpss-acc-v2". If this path gets turned into
82 * something more generic for other 32 bit qualcomm
83 * SoCs then we'll likely want to turn this into a
84 * switch based on "enable-method".
85 */
86 return qcom_cpu_kpssv2_regulator_start(id, node);
87 }
88
89 void
ipq4018_mp_start_ap(platform_t plat)90 ipq4018_mp_start_ap(platform_t plat)
91 {
92 int ret;
93
94 /*
95 * First step - SCM call to set the cold boot address to mpentry, so
96 * CPUs hopefully start in the MP path.
97 */
98 ret = qcom_scm_legacy_mp_set_cold_boot_address((vm_offset_t) mpentry);
99 if (ret != 0)
100 panic("%s: Couldn't set cold boot address via SCM "
101 "(error 0x%08x)", __func__, ret);
102
103 /*
104 * Next step - loop over the CPU nodes and do the per-CPU setup
105 * required to power on the CPUs themselves.
106 */
107 ofw_cpu_early_foreach(ipq4018_start_ap, true);
108
109 /*
110 * The next set of IPIs to the CPUs will wake them up and enter
111 * mpentry.
112 */
113 }
114