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/cdefs.h> 31 #include <sys/param.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 #include <sys/reboot.h> 35 #include <sys/devmap.h> 36 #include <sys/smp.h> 37 38 #include <vm/vm.h> 39 40 #include <machine/cpu.h> 41 #include <machine/bus.h> 42 #include <machine/intr.h> 43 #include <machine/machdep.h> 44 #include <machine/platformvar.h> 45 #include <machine/smp.h> 46 47 #include <dev/fdt/fdt_common.h> 48 #include <dev/ofw/openfirm.h> 49 #include <dev/ofw/ofw_cpu.h> 50 51 #include <arm/qualcomm/ipq4018_machdep.h> 52 #include <arm/qualcomm/qcom_scm_legacy.h> 53 #include <arm/qualcomm/qcom_cpu_kpssv2.h> 54 55 #include "platform_if.h" 56 57 void 58 ipq4018_mp_setmaxid(platform_t plat) 59 { 60 int ncpu; 61 62 /* If we've already set the global vars don't bother to do it again. */ 63 if (mp_ncpus != 0) 64 return; 65 66 /* Read current CP15 Cache Size ID Register */ 67 ncpu = cp15_l2ctlr_get(); 68 ncpu = CPUV7_L2CTLR_NPROC(ncpu); 69 70 mp_ncpus = ncpu; 71 mp_maxid = ncpu - 1; 72 73 printf("SMP: ncpu=%d\n", ncpu); 74 } 75 76 static bool 77 ipq4018_start_ap(u_int id, phandle_t node, u_int addr_cells, pcell_t *arg) 78 { 79 80 /* 81 * For the IPQ401x we assume the enable method is 82 * "qcom,kpss-acc-v2". If this path gets turned into 83 * something more generic for other 32 bit qualcomm 84 * SoCs then we'll likely want to turn this into a 85 * switch based on "enable-method". 86 */ 87 return qcom_cpu_kpssv2_regulator_start(id, node); 88 } 89 90 void 91 ipq4018_mp_start_ap(platform_t plat) 92 { 93 int ret; 94 95 /* 96 * First step - SCM call to set the cold boot address to mpentry, so 97 * CPUs hopefully start in the MP path. 98 */ 99 ret = qcom_scm_legacy_mp_set_cold_boot_address((vm_offset_t) mpentry); 100 if (ret != 0) 101 panic("%s: Couldn't set cold boot address via SCM " 102 "(error 0x%08x)", __func__, ret); 103 104 /* 105 * Next step - loop over the CPU nodes and do the per-CPU setup 106 * required to power on the CPUs themselves. 107 */ 108 ofw_cpu_early_foreach(ipq4018_start_ap, true); 109 110 /* 111 * The next set of IPIs to the CPUs will wake them up and enter 112 * mpentry. 113 */ 114 } 115